Bug Summary

File:tools/clang/lib/Sema/SemaExprObjC.cpp
Warning:line 2413, 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-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-8/lib/clang/8.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-8~svn345461/tools/clang/include -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/include -I /build/llvm-toolchain-snapshot-8~svn345461/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/include/clang/8.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-8/lib/clang/8.0.0/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-8~svn345461/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-2018-10-27-211344-32123-1 -x c++ /build/llvm-toolchain-snapshot-8~svn345461/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->getBeginLoc(), diag::err_cfstring_literal_not_string_constant)
54 << S->getSourceRange();
55 return true;
56 }
57
58 // Append the string.
59 StrBuf += S->getString();
60
61 // Get the locations of the string tokens.
62 StrLocs.append(S->tokloc_begin(), S->tokloc_end());
63 }
64
65 // Create the aggregate string with the appropriate content and location
66 // information.
67 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
68 assert(CAT && "String literal not of constant array type!")((CAT && "String literal not of constant array type!"
) ? static_cast<void> (0) : __assert_fail ("CAT && \"String literal not of constant array type!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 68, __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->getBeginLoc(), diag::err_no_nsconstant_string_class)
111 << NSIdent << S->getSourceRange();
112 Ty = Context.getObjCIdType();
113 }
114 } else {
115 IdentifierInfo *NSIdent = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
116 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
117 LookupOrdinaryName);
118 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
119 Context.setObjCConstantStringInterface(StrIF);
120 Ty = Context.getObjCConstantStringInterface();
121 Ty = Context.getObjCObjectPointerType(Ty);
122 } else {
123 // If there is no NSString interface defined, implicitly declare
124 // a @class NSString; and use that instead. This is to make sure
125 // type of an NSString literal is represented correctly, instead of
126 // being an 'id' type.
127 Ty = Context.getObjCNSStringType();
128 if (Ty.isNull()) {
129 ObjCInterfaceDecl *NSStringIDecl =
130 ObjCInterfaceDecl::Create (Context,
131 Context.getTranslationUnitDecl(),
132 SourceLocation(), NSIdent,
133 nullptr, nullptr, SourceLocation());
134 Ty = Context.getObjCInterfaceType(NSStringIDecl);
135 Context.setObjCNSStringType(Ty);
136 }
137 Ty = Context.getObjCObjectPointerType(Ty);
138 }
139 }
140
141 return new (Context) ObjCStringLiteral(S, Ty, AtLoc);
142}
143
144/// Emits an error if the given method does not exist, or if the return
145/// type is not an Objective-C object.
146static bool validateBoxingMethod(Sema &S, SourceLocation Loc,
147 const ObjCInterfaceDecl *Class,
148 Selector Sel, const ObjCMethodDecl *Method) {
149 if (!Method) {
150 // FIXME: Is there a better way to avoid quotes than using getName()?
151 S.Diag(Loc, diag::err_undeclared_boxing_method) << Sel << Class->getName();
152 return false;
153 }
154
155 // Make sure the return type is reasonable.
156 QualType ReturnType = Method->getReturnType();
157 if (!ReturnType->isObjCObjectPointerType()) {
158 S.Diag(Loc, diag::err_objc_literal_method_sig)
159 << Sel;
160 S.Diag(Method->getLocation(), diag::note_objc_literal_method_return)
161 << ReturnType;
162 return false;
163 }
164
165 return true;
166}
167
168/// Maps ObjCLiteralKind to NSClassIdKindKind
169static NSAPI::NSClassIdKindKind ClassKindFromLiteralKind(
170 Sema::ObjCLiteralKind LiteralKind) {
171 switch (LiteralKind) {
172 case Sema::LK_Array:
173 return NSAPI::ClassId_NSArray;
174 case Sema::LK_Dictionary:
175 return NSAPI::ClassId_NSDictionary;
176 case Sema::LK_Numeric:
177 return NSAPI::ClassId_NSNumber;
178 case Sema::LK_String:
179 return NSAPI::ClassId_NSString;
180 case Sema::LK_Boxed:
181 return NSAPI::ClassId_NSValue;
182
183 // there is no corresponding matching
184 // between LK_None/LK_Block and NSClassIdKindKind
185 case Sema::LK_Block:
186 case Sema::LK_None:
187 break;
188 }
189 llvm_unreachable("LiteralKind can't be converted into a ClassKind")::llvm::llvm_unreachable_internal("LiteralKind can't be converted into a ClassKind"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 189)
;
190}
191
192/// Validates ObjCInterfaceDecl availability.
193/// ObjCInterfaceDecl, used to create ObjC literals, should be defined
194/// if clang not in a debugger mode.
195static bool ValidateObjCLiteralInterfaceDecl(Sema &S, ObjCInterfaceDecl *Decl,
196 SourceLocation Loc,
197 Sema::ObjCLiteralKind LiteralKind) {
198 if (!Decl) {
199 NSAPI::NSClassIdKindKind Kind = ClassKindFromLiteralKind(LiteralKind);
200 IdentifierInfo *II = S.NSAPIObj->getNSClassId(Kind);
201 S.Diag(Loc, diag::err_undeclared_objc_literal_class)
202 << II->getName() << LiteralKind;
203 return false;
204 } else if (!Decl->hasDefinition() && !S.getLangOpts().DebuggerObjCLiteral) {
205 S.Diag(Loc, diag::err_undeclared_objc_literal_class)
206 << Decl->getName() << LiteralKind;
207 S.Diag(Decl->getLocation(), diag::note_forward_class);
208 return false;
209 }
210
211 return true;
212}
213
214/// Looks up ObjCInterfaceDecl of a given NSClassIdKindKind.
215/// Used to create ObjC literals, such as NSDictionary (@{}),
216/// NSArray (@[]) and Boxed Expressions (@())
217static ObjCInterfaceDecl *LookupObjCInterfaceDeclForLiteral(Sema &S,
218 SourceLocation Loc,
219 Sema::ObjCLiteralKind LiteralKind) {
220 NSAPI::NSClassIdKindKind ClassKind = ClassKindFromLiteralKind(LiteralKind);
221 IdentifierInfo *II = S.NSAPIObj->getNSClassId(ClassKind);
222 NamedDecl *IF = S.LookupSingleName(S.TUScope, II, Loc,
223 Sema::LookupOrdinaryName);
224 ObjCInterfaceDecl *ID = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
225 if (!ID && S.getLangOpts().DebuggerObjCLiteral) {
226 ASTContext &Context = S.Context;
227 TranslationUnitDecl *TU = Context.getTranslationUnitDecl();
228 ID = ObjCInterfaceDecl::Create (Context, TU, SourceLocation(), II,
229 nullptr, nullptr, SourceLocation());
230 }
231
232 if (!ValidateObjCLiteralInterfaceDecl(S, ID, Loc, LiteralKind)) {
233 ID = nullptr;
234 }
235
236 return ID;
237}
238
239/// Retrieve the NSNumber factory method that should be used to create
240/// an Objective-C literal for the given type.
241static ObjCMethodDecl *getNSNumberFactoryMethod(Sema &S, SourceLocation Loc,
242 QualType NumberType,
243 bool isLiteral = false,
244 SourceRange R = SourceRange()) {
245 Optional<NSAPI::NSNumberLiteralMethodKind> Kind =
246 S.NSAPIObj->getNSNumberFactoryMethodKind(NumberType);
247
248 if (!Kind) {
249 if (isLiteral) {
250 S.Diag(Loc, diag::err_invalid_nsnumber_type)
251 << NumberType << R;
252 }
253 return nullptr;
254 }
255
256 // If we already looked up this method, we're done.
257 if (S.NSNumberLiteralMethods[*Kind])
258 return S.NSNumberLiteralMethods[*Kind];
259
260 Selector Sel = S.NSAPIObj->getNSNumberLiteralSelector(*Kind,
261 /*Instance=*/false);
262
263 ASTContext &CX = S.Context;
264
265 // Look up the NSNumber class, if we haven't done so already. It's cached
266 // in the Sema instance.
267 if (!S.NSNumberDecl) {
268 S.NSNumberDecl = LookupObjCInterfaceDeclForLiteral(S, Loc,
269 Sema::LK_Numeric);
270 if (!S.NSNumberDecl) {
271 return nullptr;
272 }
273 }
274
275 if (S.NSNumberPointer.isNull()) {
276 // generate the pointer to NSNumber type.
277 QualType NSNumberObject = CX.getObjCInterfaceType(S.NSNumberDecl);
278 S.NSNumberPointer = CX.getObjCObjectPointerType(NSNumberObject);
279 }
280
281 // Look for the appropriate method within NSNumber.
282 ObjCMethodDecl *Method = S.NSNumberDecl->lookupClassMethod(Sel);
283 if (!Method && S.getLangOpts().DebuggerObjCLiteral) {
284 // create a stub definition this NSNumber factory method.
285 TypeSourceInfo *ReturnTInfo = nullptr;
286 Method =
287 ObjCMethodDecl::Create(CX, SourceLocation(), SourceLocation(), Sel,
288 S.NSNumberPointer, ReturnTInfo, S.NSNumberDecl,
289 /*isInstance=*/false, /*isVariadic=*/false,
290 /*isPropertyAccessor=*/false,
291 /*isImplicitlyDeclared=*/true,
292 /*isDefined=*/false, ObjCMethodDecl::Required,
293 /*HasRelatedResultType=*/false);
294 ParmVarDecl *value = ParmVarDecl::Create(S.Context, Method,
295 SourceLocation(), SourceLocation(),
296 &CX.Idents.get("value"),
297 NumberType, /*TInfo=*/nullptr,
298 SC_None, nullptr);
299 Method->setMethodParams(S.Context, value, None);
300 }
301
302 if (!validateBoxingMethod(S, Loc, S.NSNumberDecl, Sel, Method))
303 return nullptr;
304
305 // Note: if the parameter type is out-of-line, we'll catch it later in the
306 // implicit conversion.
307
308 S.NSNumberLiteralMethods[*Kind] = Method;
309 return Method;
310}
311
312/// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
313/// numeric literal expression. Type of the expression will be "NSNumber *".
314ExprResult Sema::BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number) {
315 // Determine the type of the literal.
316 QualType NumberType = Number->getType();
317 if (CharacterLiteral *Char = dyn_cast<CharacterLiteral>(Number)) {
318 // In C, character literals have type 'int'. That's not the type we want
319 // to use to determine the Objective-c literal kind.
320 switch (Char->getKind()) {
321 case CharacterLiteral::Ascii:
322 case CharacterLiteral::UTF8:
323 NumberType = Context.CharTy;
324 break;
325
326 case CharacterLiteral::Wide:
327 NumberType = Context.getWideCharType();
328 break;
329
330 case CharacterLiteral::UTF16:
331 NumberType = Context.Char16Ty;
332 break;
333
334 case CharacterLiteral::UTF32:
335 NumberType = Context.Char32Ty;
336 break;
337 }
338 }
339
340 // Look for the appropriate method within NSNumber.
341 // Construct the literal.
342 SourceRange NR(Number->getSourceRange());
343 ObjCMethodDecl *Method = getNSNumberFactoryMethod(*this, AtLoc, NumberType,
344 true, NR);
345 if (!Method)
346 return ExprError();
347
348 // Convert the number to the type that the parameter expects.
349 ParmVarDecl *ParamDecl = Method->parameters()[0];
350 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
351 ParamDecl);
352 ExprResult ConvertedNumber = PerformCopyInitialization(Entity,
353 SourceLocation(),
354 Number);
355 if (ConvertedNumber.isInvalid())
356 return ExprError();
357 Number = ConvertedNumber.get();
358
359 // Use the effective source range of the literal, including the leading '@'.
360 return MaybeBindToTemporary(
361 new (Context) ObjCBoxedExpr(Number, NSNumberPointer, Method,
362 SourceRange(AtLoc, NR.getEnd())));
363}
364
365ExprResult Sema::ActOnObjCBoolLiteral(SourceLocation AtLoc,
366 SourceLocation ValueLoc,
367 bool Value) {
368 ExprResult Inner;
369 if (getLangOpts().CPlusPlus) {
370 Inner = ActOnCXXBoolLiteral(ValueLoc, Value? tok::kw_true : tok::kw_false);
371 } else {
372 // C doesn't actually have a way to represent literal values of type
373 // _Bool. So, we'll use 0/1 and implicit cast to _Bool.
374 Inner = ActOnIntegerConstant(ValueLoc, Value? 1 : 0);
375 Inner = ImpCastExprToType(Inner.get(), Context.BoolTy,
376 CK_IntegralToBoolean);
377 }
378
379 return BuildObjCNumericLiteral(AtLoc, Inner.get());
380}
381
382/// Check that the given expression is a valid element of an Objective-C
383/// collection literal.
384static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element,
385 QualType T,
386 bool ArrayLiteral = false) {
387 // If the expression is type-dependent, there's nothing for us to do.
388 if (Element->isTypeDependent())
389 return Element;
390
391 ExprResult Result = S.CheckPlaceholderExpr(Element);
392 if (Result.isInvalid())
393 return ExprError();
394 Element = Result.get();
395
396 // In C++, check for an implicit conversion to an Objective-C object pointer
397 // type.
398 if (S.getLangOpts().CPlusPlus && Element->getType()->isRecordType()) {
399 InitializedEntity Entity
400 = InitializedEntity::InitializeParameter(S.Context, T,
401 /*Consumed=*/false);
402 InitializationKind Kind = InitializationKind::CreateCopy(
403 Element->getBeginLoc(), SourceLocation());
404 InitializationSequence Seq(S, Entity, Kind, Element);
405 if (!Seq.Failed())
406 return Seq.Perform(S, Entity, Kind, Element);
407 }
408
409 Expr *OrigElement = Element;
410
411 // Perform lvalue-to-rvalue conversion.
412 Result = S.DefaultLvalueConversion(Element);
413 if (Result.isInvalid())
414 return ExprError();
415 Element = Result.get();
416
417 // Make sure that we have an Objective-C pointer type or block.
418 if (!Element->getType()->isObjCObjectPointerType() &&
419 !Element->getType()->isBlockPointerType()) {
420 bool Recovered = false;
421
422 // If this is potentially an Objective-C numeric literal, add the '@'.
423 if (isa<IntegerLiteral>(OrigElement) ||
424 isa<CharacterLiteral>(OrigElement) ||
425 isa<FloatingLiteral>(OrigElement) ||
426 isa<ObjCBoolLiteralExpr>(OrigElement) ||
427 isa<CXXBoolLiteralExpr>(OrigElement)) {
428 if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) {
429 int Which = isa<CharacterLiteral>(OrigElement) ? 1
430 : (isa<CXXBoolLiteralExpr>(OrigElement) ||
431 isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2
432 : 3;
433
434 S.Diag(OrigElement->getBeginLoc(), diag::err_box_literal_collection)
435 << Which << OrigElement->getSourceRange()
436 << FixItHint::CreateInsertion(OrigElement->getBeginLoc(), "@");
437
438 Result =
439 S.BuildObjCNumericLiteral(OrigElement->getBeginLoc(), OrigElement);
440 if (Result.isInvalid())
441 return ExprError();
442
443 Element = Result.get();
444 Recovered = true;
445 }
446 }
447 // If this is potentially an Objective-C string literal, add the '@'.
448 else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) {
449 if (String->isAscii()) {
450 S.Diag(OrigElement->getBeginLoc(), diag::err_box_literal_collection)
451 << 0 << OrigElement->getSourceRange()
452 << FixItHint::CreateInsertion(OrigElement->getBeginLoc(), "@");
453
454 Result = S.BuildObjCStringLiteral(OrigElement->getBeginLoc(), String);
455 if (Result.isInvalid())
456 return ExprError();
457
458 Element = Result.get();
459 Recovered = true;
460 }
461 }
462
463 if (!Recovered) {
464 S.Diag(Element->getBeginLoc(), diag::err_invalid_collection_element)
465 << Element->getType();
466 return ExprError();
467 }
468 }
469 if (ArrayLiteral)
470 if (ObjCStringLiteral *getString =
471 dyn_cast<ObjCStringLiteral>(OrigElement)) {
472 if (StringLiteral *SL = getString->getString()) {
473 unsigned numConcat = SL->getNumConcatenated();
474 if (numConcat > 1) {
475 // Only warn if the concatenated string doesn't come from a macro.
476 bool hasMacro = false;
477 for (unsigned i = 0; i < numConcat ; ++i)
478 if (SL->getStrTokenLoc(i).isMacroID()) {
479 hasMacro = true;
480 break;
481 }
482 if (!hasMacro)
483 S.Diag(Element->getBeginLoc(),
484 diag::warn_concatenated_nsarray_literal)
485 << Element->getType();
486 }
487 }
488 }
489
490 // Make sure that the element has the type that the container factory
491 // function expects.
492 return S.PerformCopyInitialization(
493 InitializedEntity::InitializeParameter(S.Context, T,
494 /*Consumed=*/false),
495 Element->getBeginLoc(), Element);
496}
497
498ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) {
499 if (ValueExpr->isTypeDependent()) {
500 ObjCBoxedExpr *BoxedExpr =
501 new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, nullptr, SR);
502 return BoxedExpr;
503 }
504 ObjCMethodDecl *BoxingMethod = nullptr;
505 QualType BoxedType;
506 // Convert the expression to an RValue, so we can check for pointer types...
507 ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
508 if (RValue.isInvalid()) {
509 return ExprError();
510 }
511 SourceLocation Loc = SR.getBegin();
512 ValueExpr = RValue.get();
513 QualType ValueType(ValueExpr->getType());
514 if (const PointerType *PT = ValueType->getAs<PointerType>()) {
515 QualType PointeeType = PT->getPointeeType();
516 if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) {
517
518 if (!NSStringDecl) {
519 NSStringDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
520 Sema::LK_String);
521 if (!NSStringDecl) {
522 return ExprError();
523 }
524 QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl);
525 NSStringPointer = Context.getObjCObjectPointerType(NSStringObject);
526 }
527
528 if (!StringWithUTF8StringMethod) {
529 IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
530 Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
531
532 // Look for the appropriate method within NSString.
533 BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String);
534 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
535 // Debugger needs to work even if NSString hasn't been defined.
536 TypeSourceInfo *ReturnTInfo = nullptr;
537 ObjCMethodDecl *M = ObjCMethodDecl::Create(
538 Context, SourceLocation(), SourceLocation(), stringWithUTF8String,
539 NSStringPointer, ReturnTInfo, NSStringDecl,
540 /*isInstance=*/false, /*isVariadic=*/false,
541 /*isPropertyAccessor=*/false,
542 /*isImplicitlyDeclared=*/true,
543 /*isDefined=*/false, ObjCMethodDecl::Required,
544 /*HasRelatedResultType=*/false);
545 QualType ConstCharType = Context.CharTy.withConst();
546 ParmVarDecl *value =
547 ParmVarDecl::Create(Context, M,
548 SourceLocation(), SourceLocation(),
549 &Context.Idents.get("value"),
550 Context.getPointerType(ConstCharType),
551 /*TInfo=*/nullptr,
552 SC_None, nullptr);
553 M->setMethodParams(Context, value, None);
554 BoxingMethod = M;
555 }
556
557 if (!validateBoxingMethod(*this, Loc, NSStringDecl,
558 stringWithUTF8String, BoxingMethod))
559 return ExprError();
560
561 StringWithUTF8StringMethod = BoxingMethod;
562 }
563
564 BoxingMethod = StringWithUTF8StringMethod;
565 BoxedType = NSStringPointer;
566 // Transfer the nullability from method's return type.
567 Optional<NullabilityKind> Nullability =
568 BoxingMethod->getReturnType()->getNullability(Context);
569 if (Nullability)
570 BoxedType = Context.getAttributedType(
571 AttributedType::getNullabilityAttrKind(*Nullability), BoxedType,
572 BoxedType);
573 }
574 } else if (ValueType->isBuiltinType()) {
575 // The other types we support are numeric, char and BOOL/bool. We could also
576 // provide limited support for structure types, such as NSRange, NSRect, and
577 // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h>
578 // for more details.
579
580 // Check for a top-level character literal.
581 if (const CharacterLiteral *Char =
582 dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) {
583 // In C, character literals have type 'int'. That's not the type we want
584 // to use to determine the Objective-c literal kind.
585 switch (Char->getKind()) {
586 case CharacterLiteral::Ascii:
587 case CharacterLiteral::UTF8:
588 ValueType = Context.CharTy;
589 break;
590
591 case CharacterLiteral::Wide:
592 ValueType = Context.getWideCharType();
593 break;
594
595 case CharacterLiteral::UTF16:
596 ValueType = Context.Char16Ty;
597 break;
598
599 case CharacterLiteral::UTF32:
600 ValueType = Context.Char32Ty;
601 break;
602 }
603 }
604 // FIXME: Do I need to do anything special with BoolTy expressions?
605
606 // Look for the appropriate method within NSNumber.
607 BoxingMethod = getNSNumberFactoryMethod(*this, Loc, ValueType);
608 BoxedType = NSNumberPointer;
609 } else if (const EnumType *ET = ValueType->getAs<EnumType>()) {
610 if (!ET->getDecl()->isComplete()) {
611 Diag(Loc, diag::err_objc_incomplete_boxed_expression_type)
612 << ValueType << ValueExpr->getSourceRange();
613 return ExprError();
614 }
615
616 BoxingMethod = getNSNumberFactoryMethod(*this, Loc,
617 ET->getDecl()->getIntegerType());
618 BoxedType = NSNumberPointer;
619 } else if (ValueType->isObjCBoxableRecordType()) {
620 // Support for structure types, that marked as objc_boxable
621 // struct __attribute__((objc_boxable)) s { ... };
622
623 // Look up the NSValue class, if we haven't done so already. It's cached
624 // in the Sema instance.
625 if (!NSValueDecl) {
626 NSValueDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
627 Sema::LK_Boxed);
628 if (!NSValueDecl) {
629 return ExprError();
630 }
631
632 // generate the pointer to NSValue type.
633 QualType NSValueObject = Context.getObjCInterfaceType(NSValueDecl);
634 NSValuePointer = Context.getObjCObjectPointerType(NSValueObject);
635 }
636
637 if (!ValueWithBytesObjCTypeMethod) {
638 IdentifierInfo *II[] = {
639 &Context.Idents.get("valueWithBytes"),
640 &Context.Idents.get("objCType")
641 };
642 Selector ValueWithBytesObjCType = Context.Selectors.getSelector(2, II);
643
644 // Look for the appropriate method within NSValue.
645 BoxingMethod = NSValueDecl->lookupClassMethod(ValueWithBytesObjCType);
646 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
647 // Debugger needs to work even if NSValue hasn't been defined.
648 TypeSourceInfo *ReturnTInfo = nullptr;
649 ObjCMethodDecl *M = ObjCMethodDecl::Create(
650 Context,
651 SourceLocation(),
652 SourceLocation(),
653 ValueWithBytesObjCType,
654 NSValuePointer,
655 ReturnTInfo,
656 NSValueDecl,
657 /*isInstance=*/false,
658 /*isVariadic=*/false,
659 /*isPropertyAccessor=*/false,
660 /*isImplicitlyDeclared=*/true,
661 /*isDefined=*/false,
662 ObjCMethodDecl::Required,
663 /*HasRelatedResultType=*/false);
664
665 SmallVector<ParmVarDecl *, 2> Params;
666
667 ParmVarDecl *bytes =
668 ParmVarDecl::Create(Context, M,
669 SourceLocation(), SourceLocation(),
670 &Context.Idents.get("bytes"),
671 Context.VoidPtrTy.withConst(),
672 /*TInfo=*/nullptr,
673 SC_None, nullptr);
674 Params.push_back(bytes);
675
676 QualType ConstCharType = Context.CharTy.withConst();
677 ParmVarDecl *type =
678 ParmVarDecl::Create(Context, M,
679 SourceLocation(), SourceLocation(),
680 &Context.Idents.get("type"),
681 Context.getPointerType(ConstCharType),
682 /*TInfo=*/nullptr,
683 SC_None, nullptr);
684 Params.push_back(type);
685
686 M->setMethodParams(Context, Params, None);
687 BoxingMethod = M;
688 }
689
690 if (!validateBoxingMethod(*this, Loc, NSValueDecl,
691 ValueWithBytesObjCType, BoxingMethod))
692 return ExprError();
693
694 ValueWithBytesObjCTypeMethod = BoxingMethod;
695 }
696
697 if (!ValueType.isTriviallyCopyableType(Context)) {
698 Diag(Loc, diag::err_objc_non_trivially_copyable_boxed_expression_type)
699 << ValueType << ValueExpr->getSourceRange();
700 return ExprError();
701 }
702
703 BoxingMethod = ValueWithBytesObjCTypeMethod;
704 BoxedType = NSValuePointer;
705 }
706
707 if (!BoxingMethod) {
708 Diag(Loc, diag::err_objc_illegal_boxed_expression_type)
709 << ValueType << ValueExpr->getSourceRange();
710 return ExprError();
711 }
712
713 DiagnoseUseOfDecl(BoxingMethod, Loc);
714
715 ExprResult ConvertedValueExpr;
716 if (ValueType->isObjCBoxableRecordType()) {
717 InitializedEntity IE = InitializedEntity::InitializeTemporary(ValueType);
718 ConvertedValueExpr = PerformCopyInitialization(IE, ValueExpr->getExprLoc(),
719 ValueExpr);
720 } else {
721 // Convert the expression to the type that the parameter requires.
722 ParmVarDecl *ParamDecl = BoxingMethod->parameters()[0];
723 InitializedEntity IE = InitializedEntity::InitializeParameter(Context,
724 ParamDecl);
725 ConvertedValueExpr = PerformCopyInitialization(IE, SourceLocation(),
726 ValueExpr);
727 }
728
729 if (ConvertedValueExpr.isInvalid())
730 return ExprError();
731 ValueExpr = ConvertedValueExpr.get();
732
733 ObjCBoxedExpr *BoxedExpr =
734 new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
735 BoxingMethod, SR);
736 return MaybeBindToTemporary(BoxedExpr);
737}
738
739/// Build an ObjC subscript pseudo-object expression, given that
740/// that's supported by the runtime.
741ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
742 Expr *IndexExpr,
743 ObjCMethodDecl *getterMethod,
744 ObjCMethodDecl *setterMethod) {
745 assert(!LangOpts.isSubscriptPointerArithmetic())((!LangOpts.isSubscriptPointerArithmetic()) ? static_cast<
void> (0) : __assert_fail ("!LangOpts.isSubscriptPointerArithmetic()"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 745, __PRETTY_FUNCTION__))
;
746
747 // We can't get dependent types here; our callers should have
748 // filtered them out.
749 assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&(((!BaseExpr->isTypeDependent() && !IndexExpr->
isTypeDependent()) && "base or index cannot have dependent type here"
) ? static_cast<void> (0) : __assert_fail ("(!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) && \"base or index cannot have dependent type here\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 750, __PRETTY_FUNCTION__))
750 "base or index cannot have dependent type here")(((!BaseExpr->isTypeDependent() && !IndexExpr->
isTypeDependent()) && "base or index cannot have dependent type here"
) ? static_cast<void> (0) : __assert_fail ("(!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) && \"base or index cannot have dependent type here\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 750, __PRETTY_FUNCTION__))
;
751
752 // Filter out placeholders in the index. In theory, overloads could
753 // be preserved here, although that might not actually work correctly.
754 ExprResult Result = CheckPlaceholderExpr(IndexExpr);
755 if (Result.isInvalid())
756 return ExprError();
757 IndexExpr = Result.get();
758
759 // Perform lvalue-to-rvalue conversion on the base.
760 Result = DefaultLvalueConversion(BaseExpr);
761 if (Result.isInvalid())
762 return ExprError();
763 BaseExpr = Result.get();
764
765 // Build the pseudo-object expression.
766 return new (Context) ObjCSubscriptRefExpr(
767 BaseExpr, IndexExpr, Context.PseudoObjectTy, VK_LValue, OK_ObjCSubscript,
768 getterMethod, setterMethod, RB);
769}
770
771ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) {
772 SourceLocation Loc = SR.getBegin();
773
774 if (!NSArrayDecl) {
775 NSArrayDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
776 Sema::LK_Array);
777 if (!NSArrayDecl) {
778 return ExprError();
779 }
780 }
781
782 // Find the arrayWithObjects:count: method, if we haven't done so already.
783 QualType IdT = Context.getObjCIdType();
784 if (!ArrayWithObjectsMethod) {
785 Selector
786 Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount);
787 ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel);
788 if (!Method && getLangOpts().DebuggerObjCLiteral) {
789 TypeSourceInfo *ReturnTInfo = nullptr;
790 Method = ObjCMethodDecl::Create(
791 Context, SourceLocation(), SourceLocation(), Sel, IdT, ReturnTInfo,
792 Context.getTranslationUnitDecl(), false /*Instance*/,
793 false /*isVariadic*/,
794 /*isPropertyAccessor=*/false,
795 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
796 ObjCMethodDecl::Required, false);
797 SmallVector<ParmVarDecl *, 2> Params;
798 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
799 SourceLocation(),
800 SourceLocation(),
801 &Context.Idents.get("objects"),
802 Context.getPointerType(IdT),
803 /*TInfo=*/nullptr,
804 SC_None, nullptr);
805 Params.push_back(objects);
806 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
807 SourceLocation(),
808 SourceLocation(),
809 &Context.Idents.get("cnt"),
810 Context.UnsignedLongTy,
811 /*TInfo=*/nullptr, SC_None,
812 nullptr);
813 Params.push_back(cnt);
814 Method->setMethodParams(Context, Params, None);
815 }
816
817 if (!validateBoxingMethod(*this, Loc, NSArrayDecl, Sel, Method))
818 return ExprError();
819
820 // Dig out the type that all elements should be converted to.
821 QualType T = Method->parameters()[0]->getType();
822 const PointerType *PtrT = T->getAs<PointerType>();
823 if (!PtrT ||
824 !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
825 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
826 << Sel;
827 Diag(Method->parameters()[0]->getLocation(),
828 diag::note_objc_literal_method_param)
829 << 0 << T
830 << Context.getPointerType(IdT.withConst());
831 return ExprError();
832 }
833
834 // Check that the 'count' parameter is integral.
835 if (!Method->parameters()[1]->getType()->isIntegerType()) {
836 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
837 << Sel;
838 Diag(Method->parameters()[1]->getLocation(),
839 diag::note_objc_literal_method_param)
840 << 1
841 << Method->parameters()[1]->getType()
842 << "integral";
843 return ExprError();
844 }
845
846 // We've found a good +arrayWithObjects:count: method. Save it!
847 ArrayWithObjectsMethod = Method;
848 }
849
850 QualType ObjectsType = ArrayWithObjectsMethod->parameters()[0]->getType();
851 QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType();
852
853 // Check that each of the elements provided is valid in a collection literal,
854 // performing conversions as necessary.
855 Expr **ElementsBuffer = Elements.data();
856 for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
857 ExprResult Converted = CheckObjCCollectionLiteralElement(*this,
858 ElementsBuffer[I],
859 RequiredType, true);
860 if (Converted.isInvalid())
861 return ExprError();
862
863 ElementsBuffer[I] = Converted.get();
864 }
865
866 QualType Ty
867 = Context.getObjCObjectPointerType(
868 Context.getObjCInterfaceType(NSArrayDecl));
869
870 return MaybeBindToTemporary(
871 ObjCArrayLiteral::Create(Context, Elements, Ty,
872 ArrayWithObjectsMethod, SR));
873}
874
875ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR,
876 MutableArrayRef<ObjCDictionaryElement> Elements) {
877 SourceLocation Loc = SR.getBegin();
878
879 if (!NSDictionaryDecl) {
880 NSDictionaryDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
881 Sema::LK_Dictionary);
882 if (!NSDictionaryDecl) {
883 return ExprError();
884 }
885 }
886
887 // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done
888 // so already.
889 QualType IdT = Context.getObjCIdType();
890 if (!DictionaryWithObjectsMethod) {
891 Selector Sel = NSAPIObj->getNSDictionarySelector(
892 NSAPI::NSDict_dictionaryWithObjectsForKeysCount);
893 ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel);
894 if (!Method && getLangOpts().DebuggerObjCLiteral) {
895 Method = ObjCMethodDecl::Create(Context,
896 SourceLocation(), SourceLocation(), Sel,
897 IdT,
898 nullptr /*TypeSourceInfo */,
899 Context.getTranslationUnitDecl(),
900 false /*Instance*/, false/*isVariadic*/,
901 /*isPropertyAccessor=*/false,
902 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
903 ObjCMethodDecl::Required,
904 false);
905 SmallVector<ParmVarDecl *, 3> Params;
906 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
907 SourceLocation(),
908 SourceLocation(),
909 &Context.Idents.get("objects"),
910 Context.getPointerType(IdT),
911 /*TInfo=*/nullptr, SC_None,
912 nullptr);
913 Params.push_back(objects);
914 ParmVarDecl *keys = ParmVarDecl::Create(Context, Method,
915 SourceLocation(),
916 SourceLocation(),
917 &Context.Idents.get("keys"),
918 Context.getPointerType(IdT),
919 /*TInfo=*/nullptr, SC_None,
920 nullptr);
921 Params.push_back(keys);
922 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
923 SourceLocation(),
924 SourceLocation(),
925 &Context.Idents.get("cnt"),
926 Context.UnsignedLongTy,
927 /*TInfo=*/nullptr, SC_None,
928 nullptr);
929 Params.push_back(cnt);
930 Method->setMethodParams(Context, Params, None);
931 }
932
933 if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel,
934 Method))
935 return ExprError();
936
937 // Dig out the type that all values should be converted to.
938 QualType ValueT = Method->parameters()[0]->getType();
939 const PointerType *PtrValue = ValueT->getAs<PointerType>();
940 if (!PtrValue ||
941 !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) {
942 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
943 << Sel;
944 Diag(Method->parameters()[0]->getLocation(),
945 diag::note_objc_literal_method_param)
946 << 0 << ValueT
947 << Context.getPointerType(IdT.withConst());
948 return ExprError();
949 }
950
951 // Dig out the type that all keys should be converted to.
952 QualType KeyT = Method->parameters()[1]->getType();
953 const PointerType *PtrKey = KeyT->getAs<PointerType>();
954 if (!PtrKey ||
955 !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
956 IdT)) {
957 bool err = true;
958 if (PtrKey) {
959 if (QIDNSCopying.isNull()) {
960 // key argument of selector is id<NSCopying>?
961 if (ObjCProtocolDecl *NSCopyingPDecl =
962 LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) {
963 ObjCProtocolDecl *PQ[] = {NSCopyingPDecl};
964 QIDNSCopying =
965 Context.getObjCObjectType(Context.ObjCBuiltinIdTy, { },
966 llvm::makeArrayRef(
967 (ObjCProtocolDecl**) PQ,
968 1),
969 false);
970 QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying);
971 }
972 }
973 if (!QIDNSCopying.isNull())
974 err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
975 QIDNSCopying);
976 }
977
978 if (err) {
979 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
980 << Sel;
981 Diag(Method->parameters()[1]->getLocation(),
982 diag::note_objc_literal_method_param)
983 << 1 << KeyT
984 << Context.getPointerType(IdT.withConst());
985 return ExprError();
986 }
987 }
988
989 // Check that the 'count' parameter is integral.
990 QualType CountType = Method->parameters()[2]->getType();
991 if (!CountType->isIntegerType()) {
992 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
993 << Sel;
994 Diag(Method->parameters()[2]->getLocation(),
995 diag::note_objc_literal_method_param)
996 << 2 << CountType
997 << "integral";
998 return ExprError();
999 }
1000
1001 // We've found a good +dictionaryWithObjects:keys:count: method; save it!
1002 DictionaryWithObjectsMethod = Method;
1003 }
1004
1005 QualType ValuesT = DictionaryWithObjectsMethod->parameters()[0]->getType();
1006 QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType();
1007 QualType KeysT = DictionaryWithObjectsMethod->parameters()[1]->getType();
1008 QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType();
1009
1010 // Check that each of the keys and values provided is valid in a collection
1011 // literal, performing conversions as necessary.
1012 bool HasPackExpansions = false;
1013 for (ObjCDictionaryElement &Element : Elements) {
1014 // Check the key.
1015 ExprResult Key = CheckObjCCollectionLiteralElement(*this, Element.Key,
1016 KeyT);
1017 if (Key.isInvalid())
1018 return ExprError();
1019
1020 // Check the value.
1021 ExprResult Value
1022 = CheckObjCCollectionLiteralElement(*this, Element.Value, ValueT);
1023 if (Value.isInvalid())
1024 return ExprError();
1025
1026 Element.Key = Key.get();
1027 Element.Value = Value.get();
1028
1029 if (Element.EllipsisLoc.isInvalid())
1030 continue;
1031
1032 if (!Element.Key->containsUnexpandedParameterPack() &&
1033 !Element.Value->containsUnexpandedParameterPack()) {
1034 Diag(Element.EllipsisLoc,
1035 diag::err_pack_expansion_without_parameter_packs)
1036 << SourceRange(Element.Key->getBeginLoc(),
1037 Element.Value->getEndLoc());
1038 return ExprError();
1039 }
1040
1041 HasPackExpansions = true;
1042 }
1043
1044 QualType Ty
1045 = Context.getObjCObjectPointerType(
1046 Context.getObjCInterfaceType(NSDictionaryDecl));
1047 return MaybeBindToTemporary(ObjCDictionaryLiteral::Create(
1048 Context, Elements, HasPackExpansions, Ty,
1049 DictionaryWithObjectsMethod, SR));
1050}
1051
1052ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
1053 TypeSourceInfo *EncodedTypeInfo,
1054 SourceLocation RParenLoc) {
1055 QualType EncodedType = EncodedTypeInfo->getType();
1056 QualType StrTy;
1057 if (EncodedType->isDependentType())
1058 StrTy = Context.DependentTy;
1059 else {
1060 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
1061 !EncodedType->isVoidType()) // void is handled too.
1062 if (RequireCompleteType(AtLoc, EncodedType,
1063 diag::err_incomplete_type_objc_at_encode,
1064 EncodedTypeInfo->getTypeLoc()))
1065 return ExprError();
1066
1067 std::string Str;
1068 QualType NotEncodedT;
1069 Context.getObjCEncodingForType(EncodedType, Str, nullptr, &NotEncodedT);
1070 if (!NotEncodedT.isNull())
1071 Diag(AtLoc, diag::warn_incomplete_encoded_type)
1072 << EncodedType << NotEncodedT;
1073
1074 // The type of @encode is the same as the type of the corresponding string,
1075 // which is an array type.
1076 StrTy = Context.CharTy;
1077 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
1078 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
1079 StrTy.addConst();
1080 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
1081 ArrayType::Normal, 0);
1082 }
1083
1084 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
1085}
1086
1087ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
1088 SourceLocation EncodeLoc,
1089 SourceLocation LParenLoc,
1090 ParsedType ty,
1091 SourceLocation RParenLoc) {
1092 // FIXME: Preserve type source info ?
1093 TypeSourceInfo *TInfo;
1094 QualType EncodedType = GetTypeFromParser(ty, &TInfo);
1095 if (!TInfo)
1096 TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
1097 getLocForEndOfToken(LParenLoc));
1098
1099 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
1100}
1101
1102static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S,
1103 SourceLocation AtLoc,
1104 SourceLocation LParenLoc,
1105 SourceLocation RParenLoc,
1106 ObjCMethodDecl *Method,
1107 ObjCMethodList &MethList) {
1108 ObjCMethodList *M = &MethList;
1109 bool Warned = false;
1110 for (M = M->getNext(); M; M=M->getNext()) {
1111 ObjCMethodDecl *MatchingMethodDecl = M->getMethod();
1112 if (MatchingMethodDecl == Method ||
1113 isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) ||
1114 MatchingMethodDecl->getSelector() != Method->getSelector())
1115 continue;
1116 if (!S.MatchTwoMethodDeclarations(Method,
1117 MatchingMethodDecl, Sema::MMS_loose)) {
1118 if (!Warned) {
1119 Warned = true;
1120 S.Diag(AtLoc, diag::warn_multiple_selectors)
1121 << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(")
1122 << FixItHint::CreateInsertion(RParenLoc, ")");
1123 S.Diag(Method->getLocation(), diag::note_method_declared_at)
1124 << Method->getDeclName();
1125 }
1126 S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at)
1127 << MatchingMethodDecl->getDeclName();
1128 }
1129 }
1130 return Warned;
1131}
1132
1133static void DiagnoseMismatchedSelectors(Sema &S, SourceLocation AtLoc,
1134 ObjCMethodDecl *Method,
1135 SourceLocation LParenLoc,
1136 SourceLocation RParenLoc,
1137 bool WarnMultipleSelectors) {
1138 if (!WarnMultipleSelectors ||
1139 S.Diags.isIgnored(diag::warn_multiple_selectors, SourceLocation()))
1140 return;
1141 bool Warned = false;
1142 for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(),
1143 e = S.MethodPool.end(); b != e; b++) {
1144 // first, instance methods
1145 ObjCMethodList &InstMethList = b->second.first;
1146 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1147 Method, InstMethList))
1148 Warned = true;
1149
1150 // second, class methods
1151 ObjCMethodList &ClsMethList = b->second.second;
1152 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1153 Method, ClsMethList) || Warned)
1154 return;
1155 }
1156}
1157
1158ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
1159 SourceLocation AtLoc,
1160 SourceLocation SelLoc,
1161 SourceLocation LParenLoc,
1162 SourceLocation RParenLoc,
1163 bool WarnMultipleSelectors) {
1164 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
1165 SourceRange(LParenLoc, RParenLoc));
1166 if (!Method)
1167 Method = LookupFactoryMethodInGlobalPool(Sel,
1168 SourceRange(LParenLoc, RParenLoc));
1169 if (!Method) {
1170 if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) {
1171 Selector MatchedSel = OM->getSelector();
1172 SourceRange SelectorRange(LParenLoc.getLocWithOffset(1),
1173 RParenLoc.getLocWithOffset(-1));
1174 Diag(SelLoc, diag::warn_undeclared_selector_with_typo)
1175 << Sel << MatchedSel
1176 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1177
1178 } else
1179 Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
1180 } else
1181 DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc,
1182 WarnMultipleSelectors);
1183
1184 if (Method &&
1185 Method->getImplementationControl() != ObjCMethodDecl::Optional &&
1186 !getSourceManager().isInSystemHeader(Method->getLocation()))
1187 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc));
1188
1189 // In ARC, forbid the user from using @selector for
1190 // retain/release/autorelease/dealloc/retainCount.
1191 if (getLangOpts().ObjCAutoRefCount) {
1192 switch (Sel.getMethodFamily()) {
1193 case OMF_retain:
1194 case OMF_release:
1195 case OMF_autorelease:
1196 case OMF_retainCount:
1197 case OMF_dealloc:
1198 Diag(AtLoc, diag::err_arc_illegal_selector) <<
1199 Sel << SourceRange(LParenLoc, RParenLoc);
1200 break;
1201
1202 case OMF_None:
1203 case OMF_alloc:
1204 case OMF_copy:
1205 case OMF_finalize:
1206 case OMF_init:
1207 case OMF_mutableCopy:
1208 case OMF_new:
1209 case OMF_self:
1210 case OMF_initialize:
1211 case OMF_performSelector:
1212 break;
1213 }
1214 }
1215 QualType Ty = Context.getObjCSelType();
1216 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
1217}
1218
1219ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
1220 SourceLocation AtLoc,
1221 SourceLocation ProtoLoc,
1222 SourceLocation LParenLoc,
1223 SourceLocation ProtoIdLoc,
1224 SourceLocation RParenLoc) {
1225 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc);
1226 if (!PDecl) {
1227 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
1228 return true;
1229 }
1230 if (!PDecl->hasDefinition()) {
1231 Diag(ProtoLoc, diag::err_atprotocol_protocol) << PDecl;
1232 Diag(PDecl->getLocation(), diag::note_entity_declared_at) << PDecl;
1233 } else {
1234 PDecl = PDecl->getDefinition();
1235 }
1236
1237 QualType Ty = Context.getObjCProtoType();
1238 if (Ty.isNull())
1239 return true;
1240 Ty = Context.getObjCObjectPointerType(Ty);
1241 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1242}
1243
1244/// Try to capture an implicit reference to 'self'.
1245ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) {
1246 DeclContext *DC = getFunctionLevelDeclContext();
1247
1248 // If we're not in an ObjC method, error out. Note that, unlike the
1249 // C++ case, we don't require an instance method --- class methods
1250 // still have a 'self', and we really do still need to capture it!
1251 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1252 if (!method)
1253 return nullptr;
1254
1255 tryCaptureVariable(method->getSelfDecl(), Loc);
1256
1257 return method;
1258}
1259
1260static QualType stripObjCInstanceType(ASTContext &Context, QualType T) {
1261 QualType origType = T;
1262 if (auto nullability = AttributedType::stripOuterNullability(T)) {
1263 if (T == Context.getObjCInstanceType()) {
1264 return Context.getAttributedType(
1265 AttributedType::getNullabilityAttrKind(*nullability),
1266 Context.getObjCIdType(),
1267 Context.getObjCIdType());
1268 }
1269
1270 return origType;
1271 }
1272
1273 if (T == Context.getObjCInstanceType())
1274 return Context.getObjCIdType();
1275
1276 return origType;
1277}
1278
1279/// Determine the result type of a message send based on the receiver type,
1280/// method, and the kind of message send.
1281///
1282/// This is the "base" result type, which will still need to be adjusted
1283/// to account for nullability.
1284static QualType getBaseMessageSendResultType(Sema &S,
1285 QualType ReceiverType,
1286 ObjCMethodDecl *Method,
1287 bool isClassMessage,
1288 bool isSuperMessage) {
1289 assert(Method && "Must have a method")((Method && "Must have a method") ? static_cast<void
> (0) : __assert_fail ("Method && \"Must have a method\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 1289, __PRETTY_FUNCTION__))
;
1290 if (!Method->hasRelatedResultType())
1291 return Method->getSendResultType(ReceiverType);
1292
1293 ASTContext &Context = S.Context;
1294
1295 // Local function that transfers the nullability of the method's
1296 // result type to the returned result.
1297 auto transferNullability = [&](QualType type) -> QualType {
1298 // If the method's result type has nullability, extract it.
1299 if (auto nullability = Method->getSendResultType(ReceiverType)
1300 ->getNullability(Context)){
1301 // Strip off any outer nullability sugar from the provided type.
1302 (void)AttributedType::stripOuterNullability(type);
1303
1304 // Form a new attributed type using the method result type's nullability.
1305 return Context.getAttributedType(
1306 AttributedType::getNullabilityAttrKind(*nullability),
1307 type,
1308 type);
1309 }
1310
1311 return type;
1312 };
1313
1314 // If a method has a related return type:
1315 // - if the method found is an instance method, but the message send
1316 // was a class message send, T is the declared return type of the method
1317 // found
1318 if (Method->isInstanceMethod() && isClassMessage)
1319 return stripObjCInstanceType(Context,
1320 Method->getSendResultType(ReceiverType));
1321
1322 // - if the receiver is super, T is a pointer to the class of the
1323 // enclosing method definition
1324 if (isSuperMessage) {
1325 if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl())
1326 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) {
1327 return transferNullability(
1328 Context.getObjCObjectPointerType(
1329 Context.getObjCInterfaceType(Class)));
1330 }
1331 }
1332
1333 // - if the receiver is the name of a class U, T is a pointer to U
1334 if (ReceiverType->getAsObjCInterfaceType())
1335 return transferNullability(Context.getObjCObjectPointerType(ReceiverType));
1336 // - if the receiver is of type Class or qualified Class type,
1337 // T is the declared return type of the method.
1338 if (ReceiverType->isObjCClassType() ||
1339 ReceiverType->isObjCQualifiedClassType())
1340 return stripObjCInstanceType(Context,
1341 Method->getSendResultType(ReceiverType));
1342
1343 // - if the receiver is id, qualified id, Class, or qualified Class, T
1344 // is the receiver type, otherwise
1345 // - T is the type of the receiver expression.
1346 return transferNullability(ReceiverType);
1347}
1348
1349QualType Sema::getMessageSendResultType(QualType ReceiverType,
1350 ObjCMethodDecl *Method,
1351 bool isClassMessage,
1352 bool isSuperMessage) {
1353 // Produce the result type.
1354 QualType resultType = getBaseMessageSendResultType(*this, ReceiverType,
1355 Method,
1356 isClassMessage,
1357 isSuperMessage);
1358
1359 // If this is a class message, ignore the nullability of the receiver.
1360 if (isClassMessage)
1361 return resultType;
1362
1363 // There is nothing left to do if the result type cannot have a nullability
1364 // specifier.
1365 if (!resultType->canHaveNullability())
1366 return resultType;
1367
1368 // Map the nullability of the result into a table index.
1369 unsigned receiverNullabilityIdx = 0;
1370 if (auto nullability = ReceiverType->getNullability(Context))
1371 receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1372
1373 unsigned resultNullabilityIdx = 0;
1374 if (auto nullability = resultType->getNullability(Context))
1375 resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1376
1377 // The table of nullability mappings, indexed by the receiver's nullability
1378 // and then the result type's nullability.
1379 static const uint8_t None = 0;
1380 static const uint8_t NonNull = 1;
1381 static const uint8_t Nullable = 2;
1382 static const uint8_t Unspecified = 3;
1383 static const uint8_t nullabilityMap[4][4] = {
1384 // None NonNull Nullable Unspecified
1385 /* None */ { None, None, Nullable, None },
1386 /* NonNull */ { None, NonNull, Nullable, Unspecified },
1387 /* Nullable */ { Nullable, Nullable, Nullable, Nullable },
1388 /* Unspecified */ { None, Unspecified, Nullable, Unspecified }
1389 };
1390
1391 unsigned newResultNullabilityIdx
1392 = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx];
1393 if (newResultNullabilityIdx == resultNullabilityIdx)
1394 return resultType;
1395
1396 // Strip off the existing nullability. This removes as little type sugar as
1397 // possible.
1398 do {
1399 if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) {
1400 resultType = attributed->getModifiedType();
1401 } else {
1402 resultType = resultType.getDesugaredType(Context);
1403 }
1404 } while (resultType->getNullability(Context));
1405
1406 // Add nullability back if needed.
1407 if (newResultNullabilityIdx > 0) {
1408 auto newNullability
1409 = static_cast<NullabilityKind>(newResultNullabilityIdx-1);
1410 return Context.getAttributedType(
1411 AttributedType::getNullabilityAttrKind(newNullability),
1412 resultType, resultType);
1413 }
1414
1415 return resultType;
1416}
1417
1418/// Look for an ObjC method whose result type exactly matches the given type.
1419static const ObjCMethodDecl *
1420findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD,
1421 QualType instancetype) {
1422 if (MD->getReturnType() == instancetype)
1423 return MD;
1424
1425 // For these purposes, a method in an @implementation overrides a
1426 // declaration in the @interface.
1427 if (const ObjCImplDecl *impl =
1428 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1429 const ObjCContainerDecl *iface;
1430 if (const ObjCCategoryImplDecl *catImpl =
1431 dyn_cast<ObjCCategoryImplDecl>(impl)) {
1432 iface = catImpl->getCategoryDecl();
1433 } else {
1434 iface = impl->getClassInterface();
1435 }
1436
1437 const ObjCMethodDecl *ifaceMD =
1438 iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1439 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1440 }
1441
1442 SmallVector<const ObjCMethodDecl *, 4> overrides;
1443 MD->getOverriddenMethods(overrides);
1444 for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1445 if (const ObjCMethodDecl *result =
1446 findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1447 return result;
1448 }
1449
1450 return nullptr;
1451}
1452
1453void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) {
1454 // Only complain if we're in an ObjC method and the required return
1455 // type doesn't match the method's declared return type.
1456 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1457 if (!MD || !MD->hasRelatedResultType() ||
1458 Context.hasSameUnqualifiedType(destType, MD->getReturnType()))
1459 return;
1460
1461 // Look for a method overridden by this method which explicitly uses
1462 // 'instancetype'.
1463 if (const ObjCMethodDecl *overridden =
1464 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) {
1465 SourceRange range = overridden->getReturnTypeSourceRange();
1466 SourceLocation loc = range.getBegin();
1467 if (loc.isInvalid())
1468 loc = overridden->getLocation();
1469 Diag(loc, diag::note_related_result_type_explicit)
1470 << /*current method*/ 1 << range;
1471 return;
1472 }
1473
1474 // Otherwise, if we have an interesting method family, note that.
1475 // This should always trigger if the above didn't.
1476 if (ObjCMethodFamily family = MD->getMethodFamily())
1477 Diag(MD->getLocation(), diag::note_related_result_type_family)
1478 << /*current method*/ 1
1479 << family;
1480}
1481
1482void Sema::EmitRelatedResultTypeNote(const Expr *E) {
1483 E = E->IgnoreParenImpCasts();
1484 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1485 if (!MsgSend)
1486 return;
1487
1488 const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1489 if (!Method)
1490 return;
1491
1492 if (!Method->hasRelatedResultType())
1493 return;
1494
1495 if (Context.hasSameUnqualifiedType(
1496 Method->getReturnType().getNonReferenceType(), MsgSend->getType()))
1497 return;
1498
1499 if (!Context.hasSameUnqualifiedType(Method->getReturnType(),
1500 Context.getObjCInstanceType()))
1501 return;
1502
1503 Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1504 << Method->isInstanceMethod() << Method->getSelector()
1505 << MsgSend->getType();
1506}
1507
1508bool Sema::CheckMessageArgumentTypes(QualType ReceiverType,
1509 MultiExprArg Args,
1510 Selector Sel,
1511 ArrayRef<SourceLocation> SelectorLocs,
1512 ObjCMethodDecl *Method,
1513 bool isClassMessage, bool isSuperMessage,
1514 SourceLocation lbrac, SourceLocation rbrac,
1515 SourceRange RecRange,
1516 QualType &ReturnType, ExprValueKind &VK) {
1517 SourceLocation SelLoc;
1518 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1519 SelLoc = SelectorLocs.front();
1520 else
1521 SelLoc = lbrac;
1522
1523 if (!Method) {
1524 // Apply default argument promotion as for (C99 6.5.2.2p6).
1525 for (unsigned i = 0, e = Args.size(); i != e; i++) {
1526 if (Args[i]->isTypeDependent())
1527 continue;
1528
1529 ExprResult result;
1530 if (getLangOpts().DebuggerSupport) {
1531 QualType paramTy; // ignored
1532 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1533 } else {
1534 result = DefaultArgumentPromotion(Args[i]);
1535 }
1536 if (result.isInvalid())
1537 return true;
1538 Args[i] = result.get();
1539 }
1540
1541 unsigned DiagID;
1542 if (getLangOpts().ObjCAutoRefCount)
1543 DiagID = diag::err_arc_method_not_found;
1544 else
1545 DiagID = isClassMessage ? diag::warn_class_method_not_found
1546 : diag::warn_inst_method_not_found;
1547 if (!getLangOpts().DebuggerSupport) {
1548 const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1549 if (OMD && !OMD->isInvalidDecl()) {
1550 if (getLangOpts().ObjCAutoRefCount)
1551 DiagID = diag::err_method_not_found_with_typo;
1552 else
1553 DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1554 : diag::warn_instance_method_not_found_with_typo;
1555 Selector MatchedSel = OMD->getSelector();
1556 SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1557 if (MatchedSel.isUnarySelector())
1558 Diag(SelLoc, DiagID)
1559 << Sel<< isClassMessage << MatchedSel
1560 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1561 else
1562 Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel;
1563 }
1564 else
1565 Diag(SelLoc, DiagID)
1566 << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1567 SelectorLocs.back());
1568 // Find the class to which we are sending this message.
1569 if (ReceiverType->isObjCObjectPointerType()) {
1570 if (ObjCInterfaceDecl *ThisClass =
1571 ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) {
1572 Diag(ThisClass->getLocation(), diag::note_receiver_class_declared);
1573 if (!RecRange.isInvalid())
1574 if (ThisClass->lookupClassMethod(Sel))
1575 Diag(RecRange.getBegin(),diag::note_receiver_expr_here)
1576 << FixItHint::CreateReplacement(RecRange,
1577 ThisClass->getNameAsString());
1578 }
1579 }
1580 }
1581
1582 // In debuggers, we want to use __unknown_anytype for these
1583 // results so that clients can cast them.
1584 if (getLangOpts().DebuggerSupport) {
1585 ReturnType = Context.UnknownAnyTy;
1586 } else {
1587 ReturnType = Context.getObjCIdType();
1588 }
1589 VK = VK_RValue;
1590 return false;
1591 }
1592
1593 ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage,
1594 isSuperMessage);
1595 VK = Expr::getValueKindForType(Method->getReturnType());
1596
1597 unsigned NumNamedArgs = Sel.getNumArgs();
1598 // Method might have more arguments than selector indicates. This is due
1599 // to addition of c-style arguments in method.
1600 if (Method->param_size() > Sel.getNumArgs())
1601 NumNamedArgs = Method->param_size();
1602 // FIXME. This need be cleaned up.
1603 if (Args.size() < NumNamedArgs) {
1604 Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1605 << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1606 return false;
1607 }
1608
1609 // Compute the set of type arguments to be substituted into each parameter
1610 // type.
1611 Optional<ArrayRef<QualType>> typeArgs
1612 = ReceiverType->getObjCSubstitutions(Method->getDeclContext());
1613 bool IsError = false;
1614 for (unsigned i = 0; i < NumNamedArgs; i++) {
1615 // We can't do any type-checking on a type-dependent argument.
1616 if (Args[i]->isTypeDependent())
1617 continue;
1618
1619 Expr *argExpr = Args[i];
1620
1621 ParmVarDecl *param = Method->parameters()[i];
1622 assert(argExpr && "CheckMessageArgumentTypes(): missing expression")((argExpr && "CheckMessageArgumentTypes(): missing expression"
) ? static_cast<void> (0) : __assert_fail ("argExpr && \"CheckMessageArgumentTypes(): missing expression\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 1622, __PRETTY_FUNCTION__))
;
1623
1624 if (param->hasAttr<NoEscapeAttr>())
1625 if (auto *BE = dyn_cast<BlockExpr>(
1626 argExpr->IgnoreParenNoopCasts(Context)))
1627 BE->getBlockDecl()->setDoesNotEscape();
1628
1629 // Strip the unbridged-cast placeholder expression off unless it's
1630 // a consumed argument.
1631 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1632 !param->hasAttr<CFConsumedAttr>())
1633 argExpr = stripARCUnbridgedCast(argExpr);
1634
1635 // If the parameter is __unknown_anytype, infer its type
1636 // from the argument.
1637 if (param->getType() == Context.UnknownAnyTy) {
1638 QualType paramType;
1639 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1640 if (argE.isInvalid()) {
1641 IsError = true;
1642 } else {
1643 Args[i] = argE.get();
1644
1645 // Update the parameter type in-place.
1646 param->setType(paramType);
1647 }
1648 continue;
1649 }
1650
1651 QualType origParamType = param->getType();
1652 QualType paramType = param->getType();
1653 if (typeArgs)
1654 paramType = paramType.substObjCTypeArgs(
1655 Context,
1656 *typeArgs,
1657 ObjCSubstitutionContext::Parameter);
1658
1659 if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1660 paramType,
1661 diag::err_call_incomplete_argument, argExpr))
1662 return true;
1663
1664 InitializedEntity Entity
1665 = InitializedEntity::InitializeParameter(Context, param, paramType);
1666 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr);
1667 if (ArgE.isInvalid())
1668 IsError = true;
1669 else {
1670 Args[i] = ArgE.getAs<Expr>();
1671
1672 // If we are type-erasing a block to a block-compatible
1673 // Objective-C pointer type, we may need to extend the lifetime
1674 // of the block object.
1675 if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() &&
1676 Args[i]->getType()->isBlockPointerType() &&
1677 origParamType->isObjCObjectPointerType()) {
1678 ExprResult arg = Args[i];
1679 maybeExtendBlockObject(arg);
1680 Args[i] = arg.get();
1681 }
1682 }
1683 }
1684
1685 // Promote additional arguments to variadic methods.
1686 if (Method->isVariadic()) {
1687 for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1688 if (Args[i]->isTypeDependent())
1689 continue;
1690
1691 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1692 nullptr);
1693 IsError |= Arg.isInvalid();
1694 Args[i] = Arg.get();
1695 }
1696 } else {
1697 // Check for extra arguments to non-variadic methods.
1698 if (Args.size() != NumNamedArgs) {
1699 Diag(Args[NumNamedArgs]->getBeginLoc(),
1700 diag::err_typecheck_call_too_many_args)
1701 << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1702 << Method->getSourceRange()
1703 << SourceRange(Args[NumNamedArgs]->getBeginLoc(),
1704 Args.back()->getEndLoc());
1705 }
1706 }
1707
1708 DiagnoseSentinelCalls(Method, SelLoc, Args);
1709
1710 // Do additional checkings on method.
1711 IsError |= CheckObjCMethodCall(
1712 Method, SelLoc, makeArrayRef(Args.data(), Args.size()));
1713
1714 return IsError;
1715}
1716
1717bool Sema::isSelfExpr(Expr *RExpr) {
1718 // 'self' is objc 'self' in an objc method only.
1719 ObjCMethodDecl *Method =
1720 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1721 return isSelfExpr(RExpr, Method);
1722}
1723
1724bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) {
1725 if (!method) return false;
1726
1727 receiver = receiver->IgnoreParenLValueCasts();
1728 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1729 if (DRE->getDecl() == method->getSelfDecl())
1730 return true;
1731 return false;
1732}
1733
1734/// LookupMethodInType - Look up a method in an ObjCObjectType.
1735ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type,
1736 bool isInstance) {
1737 const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1738 if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1739 // Look it up in the main interface (and categories, etc.)
1740 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1741 return method;
1742
1743 // Okay, look for "private" methods declared in any
1744 // @implementations we've seen.
1745 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1746 return method;
1747 }
1748
1749 // Check qualifiers.
1750 for (const auto *I : objType->quals())
1751 if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance))
1752 return method;
1753
1754 return nullptr;
1755}
1756
1757/// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1758/// list of a qualified objective pointer type.
1759ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel,
1760 const ObjCObjectPointerType *OPT,
1761 bool Instance)
1762{
1763 ObjCMethodDecl *MD = nullptr;
1764 for (const auto *PROTO : OPT->quals()) {
1765 if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1766 return MD;
1767 }
1768 }
1769 return nullptr;
1770}
1771
1772/// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1773/// objective C interface. This is a property reference expression.
1774ExprResult Sema::
1775HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
1776 Expr *BaseExpr, SourceLocation OpLoc,
1777 DeclarationName MemberName,
1778 SourceLocation MemberLoc,
1779 SourceLocation SuperLoc, QualType SuperType,
1780 bool Super) {
1781 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1782 ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1783
1784 if (!MemberName.isIdentifier()) {
1785 Diag(MemberLoc, diag::err_invalid_property_name)
1786 << MemberName << QualType(OPT, 0);
1787 return ExprError();
1788 }
1789
1790 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1791
1792 SourceRange BaseRange = Super? SourceRange(SuperLoc)
1793 : BaseExpr->getSourceRange();
1794 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1795 diag::err_property_not_found_forward_class,
1796 MemberName, BaseRange))
1797 return ExprError();
1798
1799 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(
1800 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1801 // Check whether we can reference this property.
1802 if (DiagnoseUseOfDecl(PD, MemberLoc))
1803 return ExprError();
1804 if (Super)
1805 return new (Context)
1806 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1807 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1808 else
1809 return new (Context)
1810 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1811 OK_ObjCProperty, MemberLoc, BaseExpr);
1812 }
1813 // Check protocols on qualified interfaces.
1814 for (const auto *I : OPT->quals())
1815 if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
1816 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1817 // Check whether we can reference this property.
1818 if (DiagnoseUseOfDecl(PD, MemberLoc))
1819 return ExprError();
1820
1821 if (Super)
1822 return new (Context) ObjCPropertyRefExpr(
1823 PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc,
1824 SuperLoc, SuperType);
1825 else
1826 return new (Context)
1827 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1828 OK_ObjCProperty, MemberLoc, BaseExpr);
1829 }
1830 // If that failed, look for an "implicit" property by seeing if the nullary
1831 // selector is implemented.
1832
1833 // FIXME: The logic for looking up nullary and unary selectors should be
1834 // shared with the code in ActOnInstanceMessage.
1835
1836 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1837 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1838
1839 // May be found in property's qualified list.
1840 if (!Getter)
1841 Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1842
1843 // If this reference is in an @implementation, check for 'private' methods.
1844 if (!Getter)
1845 Getter = IFace->lookupPrivateMethod(Sel);
1846
1847 if (Getter) {
1848 // Check if we can reference this property.
1849 if (DiagnoseUseOfDecl(Getter, MemberLoc))
1850 return ExprError();
1851 }
1852 // If we found a getter then this may be a valid dot-reference, we
1853 // will look for the matching setter, in case it is needed.
1854 Selector SetterSel =
1855 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1856 PP.getSelectorTable(), Member);
1857 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1858
1859 // May be found in property's qualified list.
1860 if (!Setter)
1861 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1862
1863 if (!Setter) {
1864 // If this reference is in an @implementation, also check for 'private'
1865 // methods.
1866 Setter = IFace->lookupPrivateMethod(SetterSel);
1867 }
1868
1869 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1870 return ExprError();
1871
1872 // Special warning if member name used in a property-dot for a setter accessor
1873 // does not use a property with same name; e.g. obj.X = ... for a property with
1874 // name 'x'.
1875 if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor() &&
1876 !IFace->FindPropertyDeclaration(
1877 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1878 if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) {
1879 // Do not warn if user is using property-dot syntax to make call to
1880 // user named setter.
1881 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter))
1882 Diag(MemberLoc,
1883 diag::warn_property_access_suggest)
1884 << MemberName << QualType(OPT, 0) << PDecl->getName()
1885 << FixItHint::CreateReplacement(MemberLoc, PDecl->getName());
1886 }
1887 }
1888
1889 if (Getter || Setter) {
1890 if (Super)
1891 return new (Context)
1892 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1893 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1894 else
1895 return new (Context)
1896 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1897 OK_ObjCProperty, MemberLoc, BaseExpr);
1898
1899 }
1900
1901 // Attempt to correct for typos in property names.
1902 if (TypoCorrection Corrected =
1903 CorrectTypo(DeclarationNameInfo(MemberName, MemberLoc),
1904 LookupOrdinaryName, nullptr, nullptr,
1905 llvm::make_unique<DeclFilterCCC<ObjCPropertyDecl>>(),
1906 CTK_ErrorRecovery, IFace, false, OPT)) {
1907 DeclarationName TypoResult = Corrected.getCorrection();
1908 if (TypoResult.isIdentifier() &&
1909 TypoResult.getAsIdentifierInfo() == Member) {
1910 // There is no need to try the correction if it is the same.
1911 NamedDecl *ChosenDecl =
1912 Corrected.isKeyword() ? nullptr : Corrected.getFoundDecl();
1913 if (ChosenDecl && isa<ObjCPropertyDecl>(ChosenDecl))
1914 if (cast<ObjCPropertyDecl>(ChosenDecl)->isClassProperty()) {
1915 // This is a class property, we should not use the instance to
1916 // access it.
1917 Diag(MemberLoc, diag::err_class_property_found) << MemberName
1918 << OPT->getInterfaceDecl()->getName()
1919 << FixItHint::CreateReplacement(BaseExpr->getSourceRange(),
1920 OPT->getInterfaceDecl()->getName());
1921 return ExprError();
1922 }
1923 } else {
1924 diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1925 << MemberName << QualType(OPT, 0));
1926 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
1927 TypoResult, MemberLoc,
1928 SuperLoc, SuperType, Super);
1929 }
1930 }
1931 ObjCInterfaceDecl *ClassDeclared;
1932 if (ObjCIvarDecl *Ivar =
1933 IFace->lookupInstanceVariable(Member, ClassDeclared)) {
1934 QualType T = Ivar->getType();
1935 if (const ObjCObjectPointerType * OBJPT =
1936 T->getAsObjCInterfacePointerType()) {
1937 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
1938 diag::err_property_not_as_forward_class,
1939 MemberName, BaseExpr))
1940 return ExprError();
1941 }
1942 Diag(MemberLoc,
1943 diag::err_ivar_access_using_property_syntax_suggest)
1944 << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
1945 << FixItHint::CreateReplacement(OpLoc, "->");
1946 return ExprError();
1947 }
1948
1949 Diag(MemberLoc, diag::err_property_not_found)
1950 << MemberName << QualType(OPT, 0);
1951 if (Setter)
1952 Diag(Setter->getLocation(), diag::note_getter_unavailable)
1953 << MemberName << BaseExpr->getSourceRange();
1954 return ExprError();
1955}
1956
1957ExprResult Sema::
1958ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
1959 IdentifierInfo &propertyName,
1960 SourceLocation receiverNameLoc,
1961 SourceLocation propertyNameLoc) {
1962
1963 IdentifierInfo *receiverNamePtr = &receiverName;
1964 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
1965 receiverNameLoc);
1966
1967 QualType SuperType;
1968 if (!IFace) {
1969 // If the "receiver" is 'super' in a method, handle it as an expression-like
1970 // property reference.
1971 if (receiverNamePtr->isStr("super")) {
1972 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
1973 if (auto classDecl = CurMethod->getClassInterface()) {
1974 SuperType = QualType(classDecl->getSuperClassType(), 0);
1975 if (CurMethod->isInstanceMethod()) {
1976 if (SuperType.isNull()) {
1977 // The current class does not have a superclass.
1978 Diag(receiverNameLoc, diag::err_root_class_cannot_use_super)
1979 << CurMethod->getClassInterface()->getIdentifier();
1980 return ExprError();
1981 }
1982 QualType T = Context.getObjCObjectPointerType(SuperType);
1983
1984 return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(),
1985 /*BaseExpr*/nullptr,
1986 SourceLocation()/*OpLoc*/,
1987 &propertyName,
1988 propertyNameLoc,
1989 receiverNameLoc, T, true);
1990 }
1991
1992 // Otherwise, if this is a class method, try dispatching to our
1993 // superclass.
1994 IFace = CurMethod->getClassInterface()->getSuperClass();
1995 }
1996 }
1997 }
1998
1999 if (!IFace) {
2000 Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier
2001 << tok::l_paren;
2002 return ExprError();
2003 }
2004 }
2005
2006 Selector GetterSel;
2007 Selector SetterSel;
2008 if (auto PD = IFace->FindPropertyDeclaration(
2009 &propertyName, ObjCPropertyQueryKind::OBJC_PR_query_class)) {
2010 GetterSel = PD->getGetterName();
2011 SetterSel = PD->getSetterName();
2012 } else {
2013 GetterSel = PP.getSelectorTable().getNullarySelector(&propertyName);
2014 SetterSel = SelectorTable::constructSetterSelector(
2015 PP.getIdentifierTable(), PP.getSelectorTable(), &propertyName);
2016 }
2017
2018 // Search for a declared property first.
2019 ObjCMethodDecl *Getter = IFace->lookupClassMethod(GetterSel);
2020
2021 // If this reference is in an @implementation, check for 'private' methods.
2022 if (!Getter)
2023 Getter = IFace->lookupPrivateClassMethod(GetterSel);
2024
2025 if (Getter) {
2026 // FIXME: refactor/share with ActOnMemberReference().
2027 // Check if we can reference this property.
2028 if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
2029 return ExprError();
2030 }
2031
2032 // Look for the matching setter, in case it is needed.
2033 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
2034 if (!Setter) {
2035 // If this reference is in an @implementation, also check for 'private'
2036 // methods.
2037 Setter = IFace->lookupPrivateClassMethod(SetterSel);
2038 }
2039 // Look through local category implementations associated with the class.
2040 if (!Setter)
2041 Setter = IFace->getCategoryClassMethod(SetterSel);
2042
2043 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
2044 return ExprError();
2045
2046 if (Getter || Setter) {
2047 if (!SuperType.isNull())
2048 return new (Context)
2049 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
2050 OK_ObjCProperty, propertyNameLoc, receiverNameLoc,
2051 SuperType);
2052
2053 return new (Context) ObjCPropertyRefExpr(
2054 Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty,
2055 propertyNameLoc, receiverNameLoc, IFace);
2056 }
2057 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
2058 << &propertyName << Context.getObjCInterfaceType(IFace));
2059}
2060
2061namespace {
2062
2063class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback {
2064 public:
2065 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
2066 // Determine whether "super" is acceptable in the current context.
2067 if (Method && Method->getClassInterface())
2068 WantObjCSuper = Method->getClassInterface()->getSuperClass();
2069 }
2070
2071 bool ValidateCandidate(const TypoCorrection &candidate) override {
2072 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
2073 candidate.isKeyword("super");
2074 }
2075};
2076
2077} // end anonymous namespace
2078
2079Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
2080 IdentifierInfo *Name,
2081 SourceLocation NameLoc,
2082 bool IsSuper,
2083 bool HasTrailingDot,
2084 ParsedType &ReceiverType) {
2085 ReceiverType = nullptr;
2086
2087 // If the identifier is "super" and there is no trailing dot, we're
2088 // messaging super. If the identifier is "super" and there is a
2089 // trailing dot, it's an instance message.
2090 if (IsSuper && S->isInObjcMethodScope())
2091 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
2092
2093 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
2094 LookupName(Result, S);
2095
2096 switch (Result.getResultKind()) {
2097 case LookupResult::NotFound:
2098 // Normal name lookup didn't find anything. If we're in an
2099 // Objective-C method, look for ivars. If we find one, we're done!
2100 // FIXME: This is a hack. Ivar lookup should be part of normal
2101 // lookup.
2102 if (ObjCMethodDecl *Method = getCurMethodDecl()) {
2103 if (!Method->getClassInterface()) {
2104 // Fall back: let the parser try to parse it as an instance message.
2105 return ObjCInstanceMessage;
2106 }
2107
2108 ObjCInterfaceDecl *ClassDeclared;
2109 if (Method->getClassInterface()->lookupInstanceVariable(Name,
2110 ClassDeclared))
2111 return ObjCInstanceMessage;
2112 }
2113
2114 // Break out; we'll perform typo correction below.
2115 break;
2116
2117 case LookupResult::NotFoundInCurrentInstantiation:
2118 case LookupResult::FoundOverloaded:
2119 case LookupResult::FoundUnresolvedValue:
2120 case LookupResult::Ambiguous:
2121 Result.suppressDiagnostics();
2122 return ObjCInstanceMessage;
2123
2124 case LookupResult::Found: {
2125 // If the identifier is a class or not, and there is a trailing dot,
2126 // it's an instance message.
2127 if (HasTrailingDot)
2128 return ObjCInstanceMessage;
2129 // We found something. If it's a type, then we have a class
2130 // message. Otherwise, it's an instance message.
2131 NamedDecl *ND = Result.getFoundDecl();
2132 QualType T;
2133 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
2134 T = Context.getObjCInterfaceType(Class);
2135 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
2136 T = Context.getTypeDeclType(Type);
2137 DiagnoseUseOfDecl(Type, NameLoc);
2138 }
2139 else
2140 return ObjCInstanceMessage;
2141
2142 // We have a class message, and T is the type we're
2143 // messaging. Build source-location information for it.
2144 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2145 ReceiverType = CreateParsedType(T, TSInfo);
2146 return ObjCClassMessage;
2147 }
2148 }
2149
2150 if (TypoCorrection Corrected = CorrectTypo(
2151 Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr,
2152 llvm::make_unique<ObjCInterfaceOrSuperCCC>(getCurMethodDecl()),
2153 CTK_ErrorRecovery, nullptr, false, nullptr, false)) {
2154 if (Corrected.isKeyword()) {
2155 // If we've found the keyword "super" (the only keyword that would be
2156 // returned by CorrectTypo), this is a send to super.
2157 diagnoseTypo(Corrected,
2158 PDiag(diag::err_unknown_receiver_suggest) << Name);
2159 return ObjCSuperMessage;
2160 } else if (ObjCInterfaceDecl *Class =
2161 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
2162 // If we found a declaration, correct when it refers to an Objective-C
2163 // class.
2164 diagnoseTypo(Corrected,
2165 PDiag(diag::err_unknown_receiver_suggest) << Name);
2166 QualType T = Context.getObjCInterfaceType(Class);
2167 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2168 ReceiverType = CreateParsedType(T, TSInfo);
2169 return ObjCClassMessage;
2170 }
2171 }
2172
2173 // Fall back: let the parser try to parse it as an instance message.
2174 return ObjCInstanceMessage;
2175}
2176
2177ExprResult Sema::ActOnSuperMessage(Scope *S,
2178 SourceLocation SuperLoc,
2179 Selector Sel,
2180 SourceLocation LBracLoc,
2181 ArrayRef<SourceLocation> SelectorLocs,
2182 SourceLocation RBracLoc,
2183 MultiExprArg Args) {
2184 // Determine whether we are inside a method or not.
2185 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
2186 if (!Method) {
1
Taking false branch
2187 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
2188 return ExprError();
2189 }
2190
2191 ObjCInterfaceDecl *Class = Method->getClassInterface();
2192 if (!Class) {
2
Assuming 'Class' is non-null
3
Taking false branch
2193 Diag(SuperLoc, diag::err_no_super_class_message)
2194 << Method->getDeclName();
2195 return ExprError();
2196 }
2197
2198 QualType SuperTy(Class->getSuperClassType(), 0);
2199 if (SuperTy.isNull()) {
4
Taking false branch
2200 // The current class does not have a superclass.
2201 Diag(SuperLoc, diag::err_root_class_cannot_use_super)
2202 << Class->getIdentifier();
2203 return ExprError();
2204 }
2205
2206 // We are in a method whose class has a superclass, so 'super'
2207 // is acting as a keyword.
2208 if (Method->getSelector() == Sel)
5
Taking false branch
2209 getCurFunction()->ObjCShouldCallSuper = false;
2210
2211 if (Method->isInstanceMethod()) {
6
Assuming the condition is false
7
Taking false branch
2212 // Since we are in an instance method, this is an instance
2213 // message to the superclass instance.
2214 SuperTy = Context.getObjCObjectPointerType(SuperTy);
2215 return BuildInstanceMessage(nullptr, SuperTy, SuperLoc,
2216 Sel, /*Method=*/nullptr,
2217 LBracLoc, SelectorLocs, RBracLoc, Args);
2218 }
2219
2220 // Since we are in a class method, this is a class message to
2221 // the superclass.
2222 return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr,
8
Passing null pointer value via 1st parameter 'ReceiverTypeInfo'
9
Calling 'Sema::BuildClassMessage'
2223 SuperTy,
2224 SuperLoc, Sel, /*Method=*/nullptr,
2225 LBracLoc, SelectorLocs, RBracLoc, Args);
2226}
2227
2228ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType,
2229 bool isSuperReceiver,
2230 SourceLocation Loc,
2231 Selector Sel,
2232 ObjCMethodDecl *Method,
2233 MultiExprArg Args) {
2234 TypeSourceInfo *receiverTypeInfo = nullptr;
2235 if (!ReceiverType.isNull())
2236 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
2237
2238 return BuildClassMessage(receiverTypeInfo, ReceiverType,
2239 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
2240 Sel, Method, Loc, Loc, Loc, Args,
2241 /*isImplicit=*/true);
2242}
2243
2244static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
2245 unsigned DiagID,
2246 bool (*refactor)(const ObjCMessageExpr *,
2247 const NSAPI &, edit::Commit &)) {
2248 SourceLocation MsgLoc = Msg->getExprLoc();
2249 if (S.Diags.isIgnored(DiagID, MsgLoc))
2250 return;
2251
2252 SourceManager &SM = S.SourceMgr;
2253 edit::Commit ECommit(SM, S.LangOpts);
2254 if (refactor(Msg,*S.NSAPIObj, ECommit)) {
2255 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
2256 << Msg->getSelector() << Msg->getSourceRange();
2257 // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
2258 if (!ECommit.isCommitable())
2259 return;
2260 for (edit::Commit::edit_iterator
2261 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
2262 const edit::Commit::Edit &Edit = *I;
2263 switch (Edit.Kind) {
2264 case edit::Commit::Act_Insert:
2265 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc,
2266 Edit.Text,
2267 Edit.BeforePrev));
2268 break;
2269 case edit::Commit::Act_InsertFromRange:
2270 Builder.AddFixItHint(
2271 FixItHint::CreateInsertionFromRange(Edit.OrigLoc,
2272 Edit.getInsertFromRange(SM),
2273 Edit.BeforePrev));
2274 break;
2275 case edit::Commit::Act_Remove:
2276 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM)));
2277 break;
2278 }
2279 }
2280 }
2281}
2282
2283static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
2284 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
2285 edit::rewriteObjCRedundantCallWithLiteral);
2286}
2287
2288static void checkFoundationAPI(Sema &S, SourceLocation Loc,
2289 const ObjCMethodDecl *Method,
2290 ArrayRef<Expr *> Args, QualType ReceiverType,
2291 bool IsClassObjectCall) {
2292 // Check if this is a performSelector method that uses a selector that returns
2293 // a record or a vector type.
2294 if (Method->getSelector().getMethodFamily() != OMF_performSelector ||
2295 Args.empty())
2296 return;
2297 const auto *SE = dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens());
2298 if (!SE)
2299 return;
2300 ObjCMethodDecl *ImpliedMethod;
2301 if (!IsClassObjectCall) {
2302 const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>();
2303 if (!OPT || !OPT->getInterfaceDecl())
2304 return;
2305 ImpliedMethod =
2306 OPT->getInterfaceDecl()->lookupInstanceMethod(SE->getSelector());
2307 if (!ImpliedMethod)
2308 ImpliedMethod =
2309 OPT->getInterfaceDecl()->lookupPrivateMethod(SE->getSelector());
2310 } else {
2311 const auto *IT = ReceiverType->getAs<ObjCInterfaceType>();
2312 if (!IT)
2313 return;
2314 ImpliedMethod = IT->getDecl()->lookupClassMethod(SE->getSelector());
2315 if (!ImpliedMethod)
2316 ImpliedMethod =
2317 IT->getDecl()->lookupPrivateClassMethod(SE->getSelector());
2318 }
2319 if (!ImpliedMethod)
2320 return;
2321 QualType Ret = ImpliedMethod->getReturnType();
2322 if (Ret->isRecordType() || Ret->isVectorType() || Ret->isExtVectorType()) {
2323 QualType Ret = ImpliedMethod->getReturnType();
2324 S.Diag(Loc, diag::warn_objc_unsafe_perform_selector)
2325 << Method->getSelector()
2326 << (!Ret->isRecordType()
2327 ? /*Vector*/ 2
2328 : Ret->isUnionType() ? /*Union*/ 1 : /*Struct*/ 0);
2329 S.Diag(ImpliedMethod->getBeginLoc(),
2330 diag::note_objc_unsafe_perform_selector_method_declared_here)
2331 << ImpliedMethod->getSelector() << Ret;
2332 }
2333}
2334
2335/// Diagnose use of %s directive in an NSString which is being passed
2336/// as formatting string to formatting method.
2337static void
2338DiagnoseCStringFormatDirectiveInObjCAPI(Sema &S,
2339 ObjCMethodDecl *Method,
2340 Selector Sel,
2341 Expr **Args, unsigned NumArgs) {
2342 unsigned Idx = 0;
2343 bool Format = false;
2344 ObjCStringFormatFamily SFFamily = Sel.getStringFormatFamily();
2345 if (SFFamily == ObjCStringFormatFamily::SFF_NSString) {
2346 Idx = 0;
2347 Format = true;
2348 }
2349 else if (Method) {
2350 for (const auto *I : Method->specific_attrs<FormatAttr>()) {
2351 if (S.GetFormatNSStringIdx(I, Idx)) {
2352 Format = true;
2353 break;
2354 }
2355 }
2356 }
2357 if (!Format || NumArgs <= Idx)
2358 return;
2359
2360 Expr *FormatExpr = Args[Idx];
2361 if (ObjCStringLiteral *OSL =
2362 dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) {
2363 StringLiteral *FormatString = OSL->getString();
2364 if (S.FormatStringHasSArg(FormatString)) {
2365 S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2366 << "%s" << 0 << 0;
2367 if (Method)
2368 S.Diag(Method->getLocation(), diag::note_method_declared_at)
2369 << Method->getDeclName();
2370 }
2371 }
2372}
2373
2374/// Build an Objective-C class message expression.
2375///
2376/// This routine takes care of both normal class messages and
2377/// class messages to the superclass.
2378///
2379/// \param ReceiverTypeInfo Type source information that describes the
2380/// receiver of this message. This may be NULL, in which case we are
2381/// sending to the superclass and \p SuperLoc must be a valid source
2382/// location.
2383
2384/// \param ReceiverType The type of the object receiving the
2385/// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2386/// type as that refers to. For a superclass send, this is the type of
2387/// the superclass.
2388///
2389/// \param SuperLoc The location of the "super" keyword in a
2390/// superclass message.
2391///
2392/// \param Sel The selector to which the message is being sent.
2393///
2394/// \param Method The method that this class message is invoking, if
2395/// already known.
2396///
2397/// \param LBracLoc The location of the opening square bracket ']'.
2398///
2399/// \param RBracLoc The location of the closing square bracket ']'.
2400///
2401/// \param ArgsIn The message arguments.
2402ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
2403 QualType ReceiverType,
2404 SourceLocation SuperLoc,
2405 Selector Sel,
2406 ObjCMethodDecl *Method,
2407 SourceLocation LBracLoc,
2408 ArrayRef<SourceLocation> SelectorLocs,
2409 SourceLocation RBracLoc,
2410 MultiExprArg ArgsIn,
2411 bool isImplicit) {
2412 SourceLocation Loc = SuperLoc.isValid()? SuperLoc
10
'?' condition is false
2413 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
11
Called C++ object pointer is null
2414 if (LBracLoc.isInvalid()) {
2415 Diag(Loc, diag::err_missing_open_square_message_send)
2416 << FixItHint::CreateInsertion(Loc, "[");
2417 LBracLoc = Loc;
2418 }
2419 ArrayRef<SourceLocation> SelectorSlotLocs;
2420 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2421 SelectorSlotLocs = SelectorLocs;
2422 else
2423 SelectorSlotLocs = Loc;
2424 SourceLocation SelLoc = SelectorSlotLocs.front();
2425
2426 if (ReceiverType->isDependentType()) {
2427 // If the receiver type is dependent, we can't type-check anything
2428 // at this point. Build a dependent expression.
2429 unsigned NumArgs = ArgsIn.size();
2430 Expr **Args = ArgsIn.data();
2431 assert(SuperLoc.isInvalid() && "Message to super with dependent type")((SuperLoc.isInvalid() && "Message to super with dependent type"
) ? static_cast<void> (0) : __assert_fail ("SuperLoc.isInvalid() && \"Message to super with dependent type\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2431, __PRETTY_FUNCTION__))
;
2432 return ObjCMessageExpr::Create(
2433 Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel,
2434 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc,
2435 isImplicit);
2436 }
2437
2438 // Find the class to which we are sending this message.
2439 ObjCInterfaceDecl *Class = nullptr;
2440 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2441 if (!ClassType || !(Class = ClassType->getInterface())) {
2442 Diag(Loc, diag::err_invalid_receiver_class_message)
2443 << ReceiverType;
2444 return ExprError();
2445 }
2446 assert(Class && "We don't know which class we're messaging?")((Class && "We don't know which class we're messaging?"
) ? static_cast<void> (0) : __assert_fail ("Class && \"We don't know which class we're messaging?\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2446, __PRETTY_FUNCTION__))
;
2447 // objc++ diagnoses during typename annotation.
2448 if (!getLangOpts().CPlusPlus)
2449 (void)DiagnoseUseOfDecl(Class, SelectorSlotLocs);
2450 // Find the method we are messaging.
2451 if (!Method) {
2452 SourceRange TypeRange
2453 = SuperLoc.isValid()? SourceRange(SuperLoc)
2454 : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2455 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2456 (getLangOpts().ObjCAutoRefCount
2457 ? diag::err_arc_receiver_forward_class
2458 : diag::warn_receiver_forward_class),
2459 TypeRange)) {
2460 // A forward class used in messaging is treated as a 'Class'
2461 Method = LookupFactoryMethodInGlobalPool(Sel,
2462 SourceRange(LBracLoc, RBracLoc));
2463 if (Method && !getLangOpts().ObjCAutoRefCount)
2464 Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2465 << Method->getDeclName();
2466 }
2467 if (!Method)
2468 Method = Class->lookupClassMethod(Sel);
2469
2470 // If we have an implementation in scope, check "private" methods.
2471 if (!Method)
2472 Method = Class->lookupPrivateClassMethod(Sel);
2473
2474 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs,
2475 nullptr, false, false, Class))
2476 return ExprError();
2477 }
2478
2479 // Check the argument types and determine the result type.
2480 QualType ReturnType;
2481 ExprValueKind VK = VK_RValue;
2482
2483 unsigned NumArgs = ArgsIn.size();
2484 Expr **Args = ArgsIn.data();
2485 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2486 Sel, SelectorLocs,
2487 Method, true,
2488 SuperLoc.isValid(), LBracLoc, RBracLoc,
2489 SourceRange(),
2490 ReturnType, VK))
2491 return ExprError();
2492
2493 if (Method && !Method->getReturnType()->isVoidType() &&
2494 RequireCompleteType(LBracLoc, Method->getReturnType(),
2495 diag::err_illegal_message_expr_incomplete_type))
2496 return ExprError();
2497
2498 // Warn about explicit call of +initialize on its own class. But not on 'super'.
2499 if (Method && Method->getMethodFamily() == OMF_initialize) {
2500 if (!SuperLoc.isValid()) {
2501 const ObjCInterfaceDecl *ID =
2502 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext());
2503 if (ID == Class) {
2504 Diag(Loc, diag::warn_direct_initialize_call);
2505 Diag(Method->getLocation(), diag::note_method_declared_at)
2506 << Method->getDeclName();
2507 }
2508 }
2509 else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2510 // [super initialize] is allowed only within an +initialize implementation
2511 if (CurMeth->getMethodFamily() != OMF_initialize) {
2512 Diag(Loc, diag::warn_direct_super_initialize_call);
2513 Diag(Method->getLocation(), diag::note_method_declared_at)
2514 << Method->getDeclName();
2515 Diag(CurMeth->getLocation(), diag::note_method_declared_at)
2516 << CurMeth->getDeclName();
2517 }
2518 }
2519 }
2520
2521 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2522
2523 // Construct the appropriate ObjCMessageExpr.
2524 ObjCMessageExpr *Result;
2525 if (SuperLoc.isValid())
2526 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2527 SuperLoc, /*IsInstanceSuper=*/false,
2528 ReceiverType, Sel, SelectorLocs,
2529 Method, makeArrayRef(Args, NumArgs),
2530 RBracLoc, isImplicit);
2531 else {
2532 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2533 ReceiverTypeInfo, Sel, SelectorLocs,
2534 Method, makeArrayRef(Args, NumArgs),
2535 RBracLoc, isImplicit);
2536 if (!isImplicit)
2537 checkCocoaAPI(*this, Result);
2538 }
2539 if (Method)
2540 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
2541 ReceiverType, /*IsClassObjectCall=*/true);
2542 return MaybeBindToTemporary(Result);
2543}
2544
2545// ActOnClassMessage - used for both unary and keyword messages.
2546// ArgExprs is optional - if it is present, the number of expressions
2547// is obtained from Sel.getNumArgs().
2548ExprResult Sema::ActOnClassMessage(Scope *S,
2549 ParsedType Receiver,
2550 Selector Sel,
2551 SourceLocation LBracLoc,
2552 ArrayRef<SourceLocation> SelectorLocs,
2553 SourceLocation RBracLoc,
2554 MultiExprArg Args) {
2555 TypeSourceInfo *ReceiverTypeInfo;
2556 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2557 if (ReceiverType.isNull())
2558 return ExprError();
2559
2560 if (!ReceiverTypeInfo)
2561 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2562
2563 return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2564 /*SuperLoc=*/SourceLocation(), Sel,
2565 /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc,
2566 Args);
2567}
2568
2569ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver,
2570 QualType ReceiverType,
2571 SourceLocation Loc,
2572 Selector Sel,
2573 ObjCMethodDecl *Method,
2574 MultiExprArg Args) {
2575 return BuildInstanceMessage(Receiver, ReceiverType,
2576 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2577 Sel, Method, Loc, Loc, Loc, Args,
2578 /*isImplicit=*/true);
2579}
2580
2581static bool isMethodDeclaredInRootProtocol(Sema &S, const ObjCMethodDecl *M) {
2582 if (!S.NSAPIObj)
2583 return false;
2584 const auto *Protocol = dyn_cast<ObjCProtocolDecl>(M->getDeclContext());
2585 if (!Protocol)
2586 return false;
2587 const IdentifierInfo *II = S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject);
2588 if (const auto *RootClass = dyn_cast_or_null<ObjCInterfaceDecl>(
2589 S.LookupSingleName(S.TUScope, II, Protocol->getBeginLoc(),
2590 Sema::LookupOrdinaryName))) {
2591 for (const ObjCProtocolDecl *P : RootClass->all_referenced_protocols()) {
2592 if (P->getCanonicalDecl() == Protocol->getCanonicalDecl())
2593 return true;
2594 }
2595 }
2596 return false;
2597}
2598
2599/// Build an Objective-C instance message expression.
2600///
2601/// This routine takes care of both normal instance messages and
2602/// instance messages to the superclass instance.
2603///
2604/// \param Receiver The expression that computes the object that will
2605/// receive this message. This may be empty, in which case we are
2606/// sending to the superclass instance and \p SuperLoc must be a valid
2607/// source location.
2608///
2609/// \param ReceiverType The (static) type of the object receiving the
2610/// message. When a \p Receiver expression is provided, this is the
2611/// same type as that expression. For a superclass instance send, this
2612/// is a pointer to the type of the superclass.
2613///
2614/// \param SuperLoc The location of the "super" keyword in a
2615/// superclass instance message.
2616///
2617/// \param Sel The selector to which the message is being sent.
2618///
2619/// \param Method The method that this instance message is invoking, if
2620/// already known.
2621///
2622/// \param LBracLoc The location of the opening square bracket ']'.
2623///
2624/// \param RBracLoc The location of the closing square bracket ']'.
2625///
2626/// \param ArgsIn The message arguments.
2627ExprResult Sema::BuildInstanceMessage(Expr *Receiver,
2628 QualType ReceiverType,
2629 SourceLocation SuperLoc,
2630 Selector Sel,
2631 ObjCMethodDecl *Method,
2632 SourceLocation LBracLoc,
2633 ArrayRef<SourceLocation> SelectorLocs,
2634 SourceLocation RBracLoc,
2635 MultiExprArg ArgsIn,
2636 bool isImplicit) {
2637 assert((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the "(((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the "
"SuperLoc must be valid so we can " "use it instead.") ? static_cast
<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-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2639, __PRETTY_FUNCTION__))
2638 "SuperLoc must be valid so we can "(((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the "
"SuperLoc must be valid so we can " "use it instead.") ? static_cast
<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-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2639, __PRETTY_FUNCTION__))
2639 "use it instead.")(((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the "
"SuperLoc must be valid so we can " "use it instead.") ? static_cast
<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-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2639, __PRETTY_FUNCTION__))
;
2640
2641 // The location of the receiver.
2642 SourceLocation Loc = SuperLoc.isValid() ? SuperLoc : Receiver->getBeginLoc();
2643 SourceRange RecRange =
2644 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2645 ArrayRef<SourceLocation> SelectorSlotLocs;
2646 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2647 SelectorSlotLocs = SelectorLocs;
2648 else
2649 SelectorSlotLocs = Loc;
2650 SourceLocation SelLoc = SelectorSlotLocs.front();
2651
2652 if (LBracLoc.isInvalid()) {
2653 Diag(Loc, diag::err_missing_open_square_message_send)
2654 << FixItHint::CreateInsertion(Loc, "[");
2655 LBracLoc = Loc;
2656 }
2657
2658 // If we have a receiver expression, perform appropriate promotions
2659 // and determine receiver type.
2660 if (Receiver) {
2661 if (Receiver->hasPlaceholderType()) {
2662 ExprResult Result;
2663 if (Receiver->getType() == Context.UnknownAnyTy)
2664 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2665 else
2666 Result = CheckPlaceholderExpr(Receiver);
2667 if (Result.isInvalid()) return ExprError();
2668 Receiver = Result.get();
2669 }
2670
2671 if (Receiver->isTypeDependent()) {
2672 // If the receiver is type-dependent, we can't type-check anything
2673 // at this point. Build a dependent expression.
2674 unsigned NumArgs = ArgsIn.size();
2675 Expr **Args = ArgsIn.data();
2676 assert(SuperLoc.isInvalid() && "Message to super with dependent type")((SuperLoc.isInvalid() && "Message to super with dependent type"
) ? static_cast<void> (0) : __assert_fail ("SuperLoc.isInvalid() && \"Message to super with dependent type\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2676, __PRETTY_FUNCTION__))
;
2677 return ObjCMessageExpr::Create(
2678 Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel,
2679 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs),
2680 RBracLoc, isImplicit);
2681 }
2682
2683 // If necessary, apply function/array conversion to the receiver.
2684 // C99 6.7.5.3p[7,8].
2685 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2686 if (Result.isInvalid())
2687 return ExprError();
2688 Receiver = Result.get();
2689 ReceiverType = Receiver->getType();
2690
2691 // If the receiver is an ObjC pointer, a block pointer, or an
2692 // __attribute__((NSObject)) pointer, we don't need to do any
2693 // special conversion in order to look up a receiver.
2694 if (ReceiverType->isObjCRetainableType()) {
2695 // do nothing
2696 } else if (!getLangOpts().ObjCAutoRefCount &&
2697 !Context.getObjCIdType().isNull() &&
2698 (ReceiverType->isPointerType() ||
2699 ReceiverType->isIntegerType())) {
2700 // Implicitly convert integers and pointers to 'id' but emit a warning.
2701 // But not in ARC.
2702 Diag(Loc, diag::warn_bad_receiver_type)
2703 << ReceiverType
2704 << Receiver->getSourceRange();
2705 if (ReceiverType->isPointerType()) {
2706 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2707 CK_CPointerToObjCPointerCast).get();
2708 } else {
2709 // TODO: specialized warning on null receivers?
2710 bool IsNull = Receiver->isNullPointerConstant(Context,
2711 Expr::NPC_ValueDependentIsNull);
2712 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2713 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2714 Kind).get();
2715 }
2716 ReceiverType = Receiver->getType();
2717 } else if (getLangOpts().CPlusPlus) {
2718 // The receiver must be a complete type.
2719 if (RequireCompleteType(Loc, Receiver->getType(),
2720 diag::err_incomplete_receiver_type))
2721 return ExprError();
2722
2723 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2724 if (result.isUsable()) {
2725 Receiver = result.get();
2726 ReceiverType = Receiver->getType();
2727 }
2728 }
2729 }
2730
2731 if (ReceiverType->isObjCIdType() && !isImplicit)
2732 Diag(Receiver->getExprLoc(), diag::warn_messaging_unqualified_id);
2733
2734 // There's a somewhat weird interaction here where we assume that we
2735 // won't actually have a method unless we also don't need to do some
2736 // of the more detailed type-checking on the receiver.
2737
2738 if (!Method) {
2739 // Handle messages to id and __kindof types (where we use the
2740 // global method pool).
2741 const ObjCObjectType *typeBound = nullptr;
2742 bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context,
2743 typeBound);
2744 if (receiverIsIdLike || ReceiverType->isBlockPointerType() ||
2745 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2746 SmallVector<ObjCMethodDecl*, 4> Methods;
2747 // If we have a type bound, further filter the methods.
2748 CollectMultipleMethodsInGlobalPool(Sel, Methods, true/*InstanceFirst*/,
2749 true/*CheckTheOther*/, typeBound);
2750 if (!Methods.empty()) {
2751 // We choose the first method as the initial candidate, then try to
2752 // select a better one.
2753 Method = Methods[0];
2754
2755 if (ObjCMethodDecl *BestMethod =
2756 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), Methods))
2757 Method = BestMethod;
2758
2759 if (!AreMultipleMethodsInGlobalPool(Sel, Method,
2760 SourceRange(LBracLoc, RBracLoc),
2761 receiverIsIdLike, Methods))
2762 DiagnoseUseOfDecl(Method, SelectorSlotLocs);
2763 }
2764 } else if (ReceiverType->isObjCClassOrClassKindOfType() ||
2765 ReceiverType->isObjCQualifiedClassType()) {
2766 // Handle messages to Class.
2767 // We allow sending a message to a qualified Class ("Class<foo>"), which
2768 // is ok as long as one of the protocols implements the selector (if not,
2769 // warn).
2770 if (!ReceiverType->isObjCClassOrClassKindOfType()) {
2771 const ObjCObjectPointerType *QClassTy
2772 = ReceiverType->getAsObjCQualifiedClassType();
2773 // Search protocols for class methods.
2774 Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2775 if (!Method) {
2776 Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2777 // warn if instance method found for a Class message.
2778 if (Method && !isMethodDeclaredInRootProtocol(*this, Method)) {
2779 Diag(SelLoc, diag::warn_instance_method_on_class_found)
2780 << Method->getSelector() << Sel;
2781 Diag(Method->getLocation(), diag::note_method_declared_at)
2782 << Method->getDeclName();
2783 }
2784 }
2785 } else {
2786 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2787 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2788 // FIXME: Is this correct? Why are we assuming that a message to
2789 // Class will call a method in the current interface?
2790
2791 // First check the public methods in the class interface.
2792 Method = ClassDecl->lookupClassMethod(Sel);
2793
2794 if (!Method)
2795 Method = ClassDecl->lookupPrivateClassMethod(Sel);
2796
2797 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs, nullptr,
2798 false, false, ClassDecl))
2799 return ExprError();
2800 }
2801 }
2802 if (!Method) {
2803 // If not messaging 'self', look for any factory method named 'Sel'.
2804 if (!Receiver || !isSelfExpr(Receiver)) {
2805 // If no class (factory) method was found, check if an _instance_
2806 // method of the same name exists in the root class only.
2807 SmallVector<ObjCMethodDecl*, 4> Methods;
2808 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2809 false/*InstanceFirst*/,
2810 true/*CheckTheOther*/);
2811 if (!Methods.empty()) {
2812 // We choose the first method as the initial candidate, then try
2813 // to select a better one.
2814 Method = Methods[0];
2815
2816 // If we find an instance method, emit warning.
2817 if (Method->isInstanceMethod()) {
2818 if (const ObjCInterfaceDecl *ID =
2819 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2820 if (ID->getSuperClass())
2821 Diag(SelLoc, diag::warn_root_inst_method_not_found)
2822 << Sel << SourceRange(LBracLoc, RBracLoc);
2823 }
2824 }
2825
2826 if (ObjCMethodDecl *BestMethod =
2827 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2828 Methods))
2829 Method = BestMethod;
2830 }
2831 }
2832 }
2833 }
2834 } else {
2835 ObjCInterfaceDecl *ClassDecl = nullptr;
2836
2837 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2838 // long as one of the protocols implements the selector (if not, warn).
2839 // And as long as message is not deprecated/unavailable (warn if it is).
2840 if (const ObjCObjectPointerType *QIdTy
2841 = ReceiverType->getAsObjCQualifiedIdType()) {
2842 // Search protocols for instance methods.
2843 Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2844 if (!Method)
2845 Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2846 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs))
2847 return ExprError();
2848 } else if (const ObjCObjectPointerType *OCIType
2849 = ReceiverType->getAsObjCInterfacePointerType()) {
2850 // We allow sending a message to a pointer to an interface (an object).
2851 ClassDecl = OCIType->getInterfaceDecl();
2852
2853 // Try to complete the type. Under ARC, this is a hard error from which
2854 // we don't try to recover.
2855 // FIXME: In the non-ARC case, this will still be a hard error if the
2856 // definition is found in a module that's not visible.
2857 const ObjCInterfaceDecl *forwardClass = nullptr;
2858 if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2859 getLangOpts().ObjCAutoRefCount
2860 ? diag::err_arc_receiver_forward_instance
2861 : diag::warn_receiver_forward_instance,
2862 Receiver? Receiver->getSourceRange()
2863 : SourceRange(SuperLoc))) {
2864 if (getLangOpts().ObjCAutoRefCount)
2865 return ExprError();
2866
2867 forwardClass = OCIType->getInterfaceDecl();
2868 Diag(Receiver ? Receiver->getBeginLoc() : SuperLoc,
2869 diag::note_receiver_is_id);
2870 Method = nullptr;
2871 } else {
2872 Method = ClassDecl->lookupInstanceMethod(Sel);
2873 }
2874
2875 if (!Method)
2876 // Search protocol qualifiers.
2877 Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2878
2879 if (!Method) {
2880 // If we have implementations in scope, check "private" methods.
2881 Method = ClassDecl->lookupPrivateMethod(Sel);
2882
2883 if (!Method && getLangOpts().ObjCAutoRefCount) {
2884 Diag(SelLoc, diag::err_arc_may_not_respond)
2885 << OCIType->getPointeeType() << Sel << RecRange
2886 << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2887 return ExprError();
2888 }
2889
2890 if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2891 // If we still haven't found a method, look in the global pool. This
2892 // behavior isn't very desirable, however we need it for GCC
2893 // compatibility. FIXME: should we deviate??
2894 if (OCIType->qual_empty()) {
2895 SmallVector<ObjCMethodDecl*, 4> Methods;
2896 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2897 true/*InstanceFirst*/,
2898 false/*CheckTheOther*/);
2899 if (!Methods.empty()) {
2900 // We choose the first method as the initial candidate, then try
2901 // to select a better one.
2902 Method = Methods[0];
2903
2904 if (ObjCMethodDecl *BestMethod =
2905 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2906 Methods))
2907 Method = BestMethod;
2908
2909 AreMultipleMethodsInGlobalPool(Sel, Method,
2910 SourceRange(LBracLoc, RBracLoc),
2911 true/*receiverIdOrClass*/,
2912 Methods);
2913 }
2914 if (Method && !forwardClass)
2915 Diag(SelLoc, diag::warn_maynot_respond)
2916 << OCIType->getInterfaceDecl()->getIdentifier()
2917 << Sel << RecRange;
2918 }
2919 }
2920 }
2921 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs, forwardClass))
2922 return ExprError();
2923 } else {
2924 // Reject other random receiver types (e.g. structs).
2925 Diag(Loc, diag::err_bad_receiver_type)
2926 << ReceiverType << Receiver->getSourceRange();
2927 return ExprError();
2928 }
2929 }
2930 }
2931
2932 FunctionScopeInfo *DIFunctionScopeInfo =
2933 (Method && Method->getMethodFamily() == OMF_init)
2934 ? getEnclosingFunction() : nullptr;
2935
2936 if (DIFunctionScopeInfo &&
2937 DIFunctionScopeInfo->ObjCIsDesignatedInit &&
2938 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2939 bool isDesignatedInitChain = false;
2940 if (SuperLoc.isValid()) {
2941 if (const ObjCObjectPointerType *
2942 OCIType = ReceiverType->getAsObjCInterfacePointerType()) {
2943 if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) {
2944 // Either we know this is a designated initializer or we
2945 // conservatively assume it because we don't know for sure.
2946 if (!ID->declaresOrInheritsDesignatedInitializers() ||
2947 ID->isDesignatedInitializer(Sel)) {
2948 isDesignatedInitChain = true;
2949 DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false;
2950 }
2951 }
2952 }
2953 }
2954 if (!isDesignatedInitChain) {
2955 const ObjCMethodDecl *InitMethod = nullptr;
2956 bool isDesignated =
2957 getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod);
2958 assert(isDesignated && InitMethod)((isDesignated && InitMethod) ? static_cast<void>
(0) : __assert_fail ("isDesignated && InitMethod", "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2958, __PRETTY_FUNCTION__))
;
2959 (void)isDesignated;
2960 Diag(SelLoc, SuperLoc.isValid() ?
2961 diag::warn_objc_designated_init_non_designated_init_call :
2962 diag::warn_objc_designated_init_non_super_designated_init_call);
2963 Diag(InitMethod->getLocation(),
2964 diag::note_objc_designated_init_marked_here);
2965 }
2966 }
2967
2968 if (DIFunctionScopeInfo &&
2969 DIFunctionScopeInfo->ObjCIsSecondaryInit &&
2970 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2971 if (SuperLoc.isValid()) {
2972 Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call);
2973 } else {
2974 DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false;
2975 }
2976 }
2977
2978 // Check the message arguments.
2979 unsigned NumArgs = ArgsIn.size();
2980 Expr **Args = ArgsIn.data();
2981 QualType ReturnType;
2982 ExprValueKind VK = VK_RValue;
2983 bool ClassMessage = (ReceiverType->isObjCClassType() ||
2984 ReceiverType->isObjCQualifiedClassType());
2985 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2986 Sel, SelectorLocs, Method,
2987 ClassMessage, SuperLoc.isValid(),
2988 LBracLoc, RBracLoc, RecRange, ReturnType, VK))
2989 return ExprError();
2990
2991 if (Method && !Method->getReturnType()->isVoidType() &&
2992 RequireCompleteType(LBracLoc, Method->getReturnType(),
2993 diag::err_illegal_message_expr_incomplete_type))
2994 return ExprError();
2995
2996 // In ARC, forbid the user from sending messages to
2997 // retain/release/autorelease/dealloc/retainCount explicitly.
2998 if (getLangOpts().ObjCAutoRefCount) {
2999 ObjCMethodFamily family =
3000 (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
3001 switch (family) {
3002 case OMF_init:
3003 if (Method)
3004 checkInitMethod(Method, ReceiverType);
3005 break;
3006
3007 case OMF_None:
3008 case OMF_alloc:
3009 case OMF_copy:
3010 case OMF_finalize:
3011 case OMF_mutableCopy:
3012 case OMF_new:
3013 case OMF_self:
3014 case OMF_initialize:
3015 break;
3016
3017 case OMF_dealloc:
3018 case OMF_retain:
3019 case OMF_release:
3020 case OMF_autorelease:
3021 case OMF_retainCount:
3022 Diag(SelLoc, diag::err_arc_illegal_explicit_message)
3023 << Sel << RecRange;
3024 break;
3025
3026 case OMF_performSelector:
3027 if (Method && NumArgs >= 1) {
3028 if (const auto *SelExp =
3029 dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens())) {
3030 Selector ArgSel = SelExp->getSelector();
3031 ObjCMethodDecl *SelMethod =
3032 LookupInstanceMethodInGlobalPool(ArgSel,
3033 SelExp->getSourceRange());
3034 if (!SelMethod)
3035 SelMethod =
3036 LookupFactoryMethodInGlobalPool(ArgSel,
3037 SelExp->getSourceRange());
3038 if (SelMethod) {
3039 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
3040 switch (SelFamily) {
3041 case OMF_alloc:
3042 case OMF_copy:
3043 case OMF_mutableCopy:
3044 case OMF_new:
3045 case OMF_init:
3046 // Issue error, unless ns_returns_not_retained.
3047 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
3048 // selector names a +1 method
3049 Diag(SelLoc,
3050 diag::err_arc_perform_selector_retains);
3051 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3052 << SelMethod->getDeclName();
3053 }
3054 break;
3055 default:
3056 // +0 call. OK. unless ns_returns_retained.
3057 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
3058 // selector names a +1 method
3059 Diag(SelLoc,
3060 diag::err_arc_perform_selector_retains);
3061 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3062 << SelMethod->getDeclName();
3063 }
3064 break;
3065 }
3066 }
3067 } else {
3068 // error (may leak).
3069 Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
3070 Diag(Args[0]->getExprLoc(), diag::note_used_here);
3071 }
3072 }
3073 break;
3074 }
3075 }
3076
3077 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
3078
3079 // Construct the appropriate ObjCMessageExpr instance.
3080 ObjCMessageExpr *Result;
3081 if (SuperLoc.isValid())
3082 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3083 SuperLoc, /*IsInstanceSuper=*/true,
3084 ReceiverType, Sel, SelectorLocs, Method,
3085 makeArrayRef(Args, NumArgs), RBracLoc,
3086 isImplicit);
3087 else {
3088 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3089 Receiver, Sel, SelectorLocs, Method,
3090 makeArrayRef(Args, NumArgs), RBracLoc,
3091 isImplicit);
3092 if (!isImplicit)
3093 checkCocoaAPI(*this, Result);
3094 }
3095 if (Method) {
3096 bool IsClassObjectCall = ClassMessage;
3097 // 'self' message receivers in class methods should be treated as message
3098 // sends to the class object in order for the semantic checks to be
3099 // performed correctly. Messages to 'super' already count as class messages,
3100 // so they don't need to be handled here.
3101 if (Receiver && isSelfExpr(Receiver)) {
3102 if (const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>()) {
3103 if (OPT->getObjectType()->isObjCClass()) {
3104 if (const auto *CurMeth = getCurMethodDecl()) {
3105 IsClassObjectCall = true;
3106 ReceiverType =
3107 Context.getObjCInterfaceType(CurMeth->getClassInterface());
3108 }
3109 }
3110 }
3111 }
3112 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
3113 ReceiverType, IsClassObjectCall);
3114 }
3115
3116 if (getLangOpts().ObjCAutoRefCount) {
3117 // In ARC, annotate delegate init calls.
3118 if (Result->getMethodFamily() == OMF_init &&
3119 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
3120 // Only consider init calls *directly* in init implementations,
3121 // not within blocks.
3122 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
3123 if (method && method->getMethodFamily() == OMF_init) {
3124 // The implicit assignment to self means we also don't want to
3125 // consume the result.
3126 Result->setDelegateInitCall(true);
3127 return Result;
3128 }
3129 }
3130
3131 // In ARC, check for message sends which are likely to introduce
3132 // retain cycles.
3133 checkRetainCycles(Result);
3134 }
3135
3136 if (getLangOpts().ObjCWeak) {
3137 if (!isImplicit && Method) {
3138 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
3139 bool IsWeak =
3140 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
3141 if (!IsWeak && Sel.isUnarySelector())
3142 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
3143 if (IsWeak &&
3144 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
3145 getCurFunction()->recordUseOfWeak(Result, Prop);
3146 }
3147 }
3148 }
3149
3150 CheckObjCCircularContainer(Result);
3151
3152 return MaybeBindToTemporary(Result);
3153}
3154
3155static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) {
3156 if (ObjCSelectorExpr *OSE =
3157 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
3158 Selector Sel = OSE->getSelector();
3159 SourceLocation Loc = OSE->getAtLoc();
3160 auto Pos = S.ReferencedSelectors.find(Sel);
3161 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
3162 S.ReferencedSelectors.erase(Pos);
3163 }
3164}
3165
3166// ActOnInstanceMessage - used for both unary and keyword messages.
3167// ArgExprs is optional - if it is present, the number of expressions
3168// is obtained from Sel.getNumArgs().
3169ExprResult Sema::ActOnInstanceMessage(Scope *S,
3170 Expr *Receiver,
3171 Selector Sel,
3172 SourceLocation LBracLoc,
3173 ArrayRef<SourceLocation> SelectorLocs,
3174 SourceLocation RBracLoc,
3175 MultiExprArg Args) {
3176 if (!Receiver)
3177 return ExprError();
3178
3179 // A ParenListExpr can show up while doing error recovery with invalid code.
3180 if (isa<ParenListExpr>(Receiver)) {
3181 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
3182 if (Result.isInvalid()) return ExprError();
3183 Receiver = Result.get();
3184 }
3185
3186 if (RespondsToSelectorSel.isNull()) {
3187 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
3188 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
3189 }
3190 if (Sel == RespondsToSelectorSel)
3191 RemoveSelectorFromWarningCache(*this, Args[0]);
3192
3193 return BuildInstanceMessage(Receiver, Receiver->getType(),
3194 /*SuperLoc=*/SourceLocation(), Sel,
3195 /*Method=*/nullptr, LBracLoc, SelectorLocs,
3196 RBracLoc, Args);
3197}
3198
3199enum ARCConversionTypeClass {
3200 /// int, void, struct A
3201 ACTC_none,
3202
3203 /// id, void (^)()
3204 ACTC_retainable,
3205
3206 /// id*, id***, void (^*)(),
3207 ACTC_indirectRetainable,
3208
3209 /// void* might be a normal C type, or it might a CF type.
3210 ACTC_voidPtr,
3211
3212 /// struct A*
3213 ACTC_coreFoundation
3214};
3215
3216static bool isAnyRetainable(ARCConversionTypeClass ACTC) {
3217 return (ACTC == ACTC_retainable ||
3218 ACTC == ACTC_coreFoundation ||
3219 ACTC == ACTC_voidPtr);
3220}
3221
3222static bool isAnyCLike(ARCConversionTypeClass ACTC) {
3223 return ACTC == ACTC_none ||
3224 ACTC == ACTC_voidPtr ||
3225 ACTC == ACTC_coreFoundation;
3226}
3227
3228static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) {
3229 bool isIndirect = false;
3230
3231 // Ignore an outermost reference type.
3232 if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
3233 type = ref->getPointeeType();
3234 isIndirect = true;
3235 }
3236
3237 // Drill through pointers and arrays recursively.
3238 while (true) {
3239 if (const PointerType *ptr = type->getAs<PointerType>()) {
3240 type = ptr->getPointeeType();
3241
3242 // The first level of pointer may be the innermost pointer on a CF type.
3243 if (!isIndirect) {
3244 if (type->isVoidType()) return ACTC_voidPtr;
3245 if (type->isRecordType()) return ACTC_coreFoundation;
3246 }
3247 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
3248 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
3249 } else {
3250 break;
3251 }
3252 isIndirect = true;
3253 }
3254
3255 if (isIndirect) {
3256 if (type->isObjCARCBridgableType())
3257 return ACTC_indirectRetainable;
3258 return ACTC_none;
3259 }
3260
3261 if (type->isObjCARCBridgableType())
3262 return ACTC_retainable;
3263
3264 return ACTC_none;
3265}
3266
3267namespace {
3268 /// A result from the cast checker.
3269 enum ACCResult {
3270 /// Cannot be casted.
3271 ACC_invalid,
3272
3273 /// Can be safely retained or not retained.
3274 ACC_bottom,
3275
3276 /// Can be casted at +0.
3277 ACC_plusZero,
3278
3279 /// Can be casted at +1.
3280 ACC_plusOne
3281 };
3282 ACCResult merge(ACCResult left, ACCResult right) {
3283 if (left == right) return left;
3284 if (left == ACC_bottom) return right;
3285 if (right == ACC_bottom) return left;
3286 return ACC_invalid;
3287 }
3288
3289 /// A checker which white-lists certain expressions whose conversion
3290 /// to or from retainable type would otherwise be forbidden in ARC.
3291 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
3292 typedef StmtVisitor<ARCCastChecker, ACCResult> super;
3293
3294 ASTContext &Context;
3295 ARCConversionTypeClass SourceClass;
3296 ARCConversionTypeClass TargetClass;
3297 bool Diagnose;
3298
3299 static bool isCFType(QualType type) {
3300 // Someday this can use ns_bridged. For now, it has to do this.
3301 return type->isCARCBridgableType();
3302 }
3303
3304 public:
3305 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
3306 ARCConversionTypeClass target, bool diagnose)
3307 : Context(Context), SourceClass(source), TargetClass(target),
3308 Diagnose(diagnose) {}
3309
3310 using super::Visit;
3311 ACCResult Visit(Expr *e) {
3312 return super::Visit(e->IgnoreParens());
3313 }
3314
3315 ACCResult VisitStmt(Stmt *s) {
3316 return ACC_invalid;
3317 }
3318
3319 /// Null pointer constants can be casted however you please.
3320 ACCResult VisitExpr(Expr *e) {
3321 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
3322 return ACC_bottom;
3323 return ACC_invalid;
3324 }
3325
3326 /// Objective-C string literals can be safely casted.
3327 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
3328 // If we're casting to any retainable type, go ahead. Global
3329 // strings are immune to retains, so this is bottom.
3330 if (isAnyRetainable(TargetClass)) return ACC_bottom;
3331
3332 return ACC_invalid;
3333 }
3334
3335 /// Look through certain implicit and explicit casts.
3336 ACCResult VisitCastExpr(CastExpr *e) {
3337 switch (e->getCastKind()) {
3338 case CK_NullToPointer:
3339 return ACC_bottom;
3340
3341 case CK_NoOp:
3342 case CK_LValueToRValue:
3343 case CK_BitCast:
3344 case CK_CPointerToObjCPointerCast:
3345 case CK_BlockPointerToObjCPointerCast:
3346 case CK_AnyPointerToBlockPointerCast:
3347 return Visit(e->getSubExpr());
3348
3349 default:
3350 return ACC_invalid;
3351 }
3352 }
3353
3354 /// Look through unary extension.
3355 ACCResult VisitUnaryExtension(UnaryOperator *e) {
3356 return Visit(e->getSubExpr());
3357 }
3358
3359 /// Ignore the LHS of a comma operator.
3360 ACCResult VisitBinComma(BinaryOperator *e) {
3361 return Visit(e->getRHS());
3362 }
3363
3364 /// Conditional operators are okay if both sides are okay.
3365 ACCResult VisitConditionalOperator(ConditionalOperator *e) {
3366 ACCResult left = Visit(e->getTrueExpr());
3367 if (left == ACC_invalid) return ACC_invalid;
3368 return merge(left, Visit(e->getFalseExpr()));
3369 }
3370
3371 /// Look through pseudo-objects.
3372 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
3373 // If we're getting here, we should always have a result.
3374 return Visit(e->getResultExpr());
3375 }
3376
3377 /// Statement expressions are okay if their result expression is okay.
3378 ACCResult VisitStmtExpr(StmtExpr *e) {
3379 return Visit(e->getSubStmt()->body_back());
3380 }
3381
3382 /// Some declaration references are okay.
3383 ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
3384 VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
3385 // References to global constants are okay.
3386 if (isAnyRetainable(TargetClass) &&
3387 isAnyRetainable(SourceClass) &&
3388 var &&
3389 !var->hasDefinition(Context) &&
3390 var->getType().isConstQualified()) {
3391
3392 // In system headers, they can also be assumed to be immune to retains.
3393 // These are things like 'kCFStringTransformToLatin'.
3394 if (Context.getSourceManager().isInSystemHeader(var->getLocation()))
3395 return ACC_bottom;
3396
3397 return ACC_plusZero;
3398 }
3399
3400 // Nothing else.
3401 return ACC_invalid;
3402 }
3403
3404 /// Some calls are okay.
3405 ACCResult VisitCallExpr(CallExpr *e) {
3406 if (FunctionDecl *fn = e->getDirectCallee())
3407 if (ACCResult result = checkCallToFunction(fn))
3408 return result;
3409
3410 return super::VisitCallExpr(e);
3411 }
3412
3413 ACCResult checkCallToFunction(FunctionDecl *fn) {
3414 // Require a CF*Ref return type.
3415 if (!isCFType(fn->getReturnType()))
3416 return ACC_invalid;
3417
3418 if (!isAnyRetainable(TargetClass))
3419 return ACC_invalid;
3420
3421 // Honor an explicit 'not retained' attribute.
3422 if (fn->hasAttr<CFReturnsNotRetainedAttr>())
3423 return ACC_plusZero;
3424
3425 // Honor an explicit 'retained' attribute, except that for
3426 // now we're not going to permit implicit handling of +1 results,
3427 // because it's a bit frightening.
3428 if (fn->hasAttr<CFReturnsRetainedAttr>())
3429 return Diagnose ? ACC_plusOne
3430 : ACC_invalid; // ACC_plusOne if we start accepting this
3431
3432 // Recognize this specific builtin function, which is used by CFSTR.
3433 unsigned builtinID = fn->getBuiltinID();
3434 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
3435 return ACC_bottom;
3436
3437 // Otherwise, don't do anything implicit with an unaudited function.
3438 if (!fn->hasAttr<CFAuditedTransferAttr>())
3439 return ACC_invalid;
3440
3441 // Otherwise, it's +0 unless it follows the create convention.
3442 if (ento::coreFoundation::followsCreateRule(fn))
3443 return Diagnose ? ACC_plusOne
3444 : ACC_invalid; // ACC_plusOne if we start accepting this
3445
3446 return ACC_plusZero;
3447 }
3448
3449 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
3450 return checkCallToMethod(e->getMethodDecl());
3451 }
3452
3453 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
3454 ObjCMethodDecl *method;
3455 if (e->isExplicitProperty())
3456 method = e->getExplicitProperty()->getGetterMethodDecl();
3457 else
3458 method = e->getImplicitPropertyGetter();
3459 return checkCallToMethod(method);
3460 }
3461
3462 ACCResult checkCallToMethod(ObjCMethodDecl *method) {
3463 if (!method) return ACC_invalid;
3464
3465 // Check for message sends to functions returning CF types. We
3466 // just obey the Cocoa conventions with these, even though the
3467 // return type is CF.
3468 if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType()))
3469 return ACC_invalid;
3470
3471 // If the method is explicitly marked not-retained, it's +0.
3472 if (method->hasAttr<CFReturnsNotRetainedAttr>())
3473 return ACC_plusZero;
3474
3475 // If the method is explicitly marked as returning retained, or its
3476 // selector follows a +1 Cocoa convention, treat it as +1.
3477 if (method->hasAttr<CFReturnsRetainedAttr>())
3478 return ACC_plusOne;
3479
3480 switch (method->getSelector().getMethodFamily()) {
3481 case OMF_alloc:
3482 case OMF_copy:
3483 case OMF_mutableCopy:
3484 case OMF_new:
3485 return ACC_plusOne;
3486
3487 default:
3488 // Otherwise, treat it as +0.
3489 return ACC_plusZero;
3490 }
3491 }
3492 };
3493} // end anonymous namespace
3494
3495bool Sema::isKnownName(StringRef name) {
3496 if (name.empty())
3497 return false;
3498 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
3499 Sema::LookupOrdinaryName);
3500 return LookupName(R, TUScope, false);
3501}
3502
3503static void addFixitForObjCARCConversion(Sema &S,
3504 DiagnosticBuilder &DiagB,
3505 Sema::CheckedConversionKind CCK,
3506 SourceLocation afterLParen,
3507 QualType castType,
3508 Expr *castExpr,
3509 Expr *realCast,
3510 const char *bridgeKeyword,
3511 const char *CFBridgeName) {
3512 // We handle C-style and implicit casts here.
3513 switch (CCK) {
3514 case Sema::CCK_ImplicitConversion:
3515 case Sema::CCK_ForBuiltinOverloadedOp:
3516 case Sema::CCK_CStyleCast:
3517 case Sema::CCK_OtherCast:
3518 break;
3519 case Sema::CCK_FunctionalCast:
3520 return;
3521 }
3522
3523 if (CFBridgeName) {
3524 if (CCK == Sema::CCK_OtherCast) {
3525 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3526 SourceRange range(NCE->getOperatorLoc(),
3527 NCE->getAngleBrackets().getEnd());
3528 SmallString<32> BridgeCall;
3529
3530 SourceManager &SM = S.getSourceManager();
3531 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3532 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3533 BridgeCall += ' ';
3534
3535 BridgeCall += CFBridgeName;
3536 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
3537 }
3538 return;
3539 }
3540 Expr *castedE = castExpr;
3541 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
3542 castedE = CCE->getSubExpr();
3543 castedE = castedE->IgnoreImpCasts();
3544 SourceRange range = castedE->getSourceRange();
3545
3546 SmallString<32> BridgeCall;
3547
3548 SourceManager &SM = S.getSourceManager();
3549 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3550 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3551 BridgeCall += ' ';
3552
3553 BridgeCall += CFBridgeName;
3554
3555 if (isa<ParenExpr>(castedE)) {
3556 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3557 BridgeCall));
3558 } else {
3559 BridgeCall += '(';
3560 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3561 BridgeCall));
3562 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3563 S.getLocForEndOfToken(range.getEnd()),
3564 ")"));
3565 }
3566 return;
3567 }
3568
3569 if (CCK == Sema::CCK_CStyleCast) {
3570 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3571 } else if (CCK == Sema::CCK_OtherCast) {
3572 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3573 std::string castCode = "(";
3574 castCode += bridgeKeyword;
3575 castCode += castType.getAsString();
3576 castCode += ")";
3577 SourceRange Range(NCE->getOperatorLoc(),
3578 NCE->getAngleBrackets().getEnd());
3579 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3580 }
3581 } else {
3582 std::string castCode = "(";
3583 castCode += bridgeKeyword;
3584 castCode += castType.getAsString();
3585 castCode += ")";
3586 Expr *castedE = castExpr->IgnoreImpCasts();
3587 SourceRange range = castedE->getSourceRange();
3588 if (isa<ParenExpr>(castedE)) {
3589 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3590 castCode));
3591 } else {
3592 castCode += "(";
3593 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3594 castCode));
3595 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3596 S.getLocForEndOfToken(range.getEnd()),
3597 ")"));
3598 }
3599 }
3600}
3601
3602template <typename T>
3603static inline T *getObjCBridgeAttr(const TypedefType *TD) {
3604 TypedefNameDecl *TDNDecl = TD->getDecl();
3605 QualType QT = TDNDecl->getUnderlyingType();
3606 if (QT->isPointerType()) {
3607 QT = QT->getPointeeType();
3608 if (const RecordType *RT = QT->getAs<RecordType>())
3609 if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl())
3610 return RD->getAttr<T>();
3611 }
3612 return nullptr;
3613}
3614
3615static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T,
3616 TypedefNameDecl *&TDNDecl) {
3617 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3618 TDNDecl = TD->getDecl();
3619 if (ObjCBridgeRelatedAttr *ObjCBAttr =
3620 getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD))
3621 return ObjCBAttr;
3622 T = TDNDecl->getUnderlyingType();
3623 }
3624 return nullptr;
3625}
3626
3627static void
3628diagnoseObjCARCConversion(Sema &S, SourceRange castRange,
3629 QualType castType, ARCConversionTypeClass castACTC,
3630 Expr *castExpr, Expr *realCast,
3631 ARCConversionTypeClass exprACTC,
3632 Sema::CheckedConversionKind CCK) {
3633 SourceLocation loc =
3634 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3635
3636 if (S.makeUnavailableInSystemHeader(loc,
3637 UnavailableAttr::IR_ARCForbiddenConversion))
3638 return;
3639
3640 QualType castExprType = castExpr->getType();
3641 // Defer emitting a diagnostic for bridge-related casts; that will be
3642 // handled by CheckObjCBridgeRelatedConversions.
3643 TypedefNameDecl *TDNDecl = nullptr;
3644 if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3645 ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) ||
3646 (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable &&
3647 ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl)))
3648 return;
3649
3650 unsigned srcKind = 0;
3651 switch (exprACTC) {
3652 case ACTC_none:
3653 case ACTC_coreFoundation:
3654 case ACTC_voidPtr:
3655 srcKind = (castExprType->isPointerType() ? 1 : 0);
3656 break;
3657 case ACTC_retainable:
3658 srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3659 break;
3660 case ACTC_indirectRetainable:
3661 srcKind = 4;
3662 break;
3663 }
3664
3665 // Check whether this could be fixed with a bridge cast.
3666 SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin());
3667 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3668
3669 unsigned convKindForDiag = Sema::isCast(CCK) ? 0 : 1;
3670
3671 // Bridge from an ARC type to a CF type.
3672 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3673
3674 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3675 << convKindForDiag
3676 << 2 // of C pointer type
3677 << castExprType
3678 << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3679 << castType
3680 << castRange
3681 << castExpr->getSourceRange();
3682 bool br = S.isKnownName("CFBridgingRelease");
3683 ACCResult CreateRule =
3684 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3685 assert(CreateRule != ACC_bottom && "This cast should already be accepted.")((CreateRule != ACC_bottom && "This cast should already be accepted."
) ? static_cast<void> (0) : __assert_fail ("CreateRule != ACC_bottom && \"This cast should already be accepted.\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 3685, __PRETTY_FUNCTION__))
;
3686 if (CreateRule != ACC_plusOne)
3687 {
3688 DiagnosticBuilder DiagB =
3689 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3690 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3691
3692 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3693 castType, castExpr, realCast, "__bridge ",
3694 nullptr);
3695 }
3696 if (CreateRule != ACC_plusZero)
3697 {
3698 DiagnosticBuilder DiagB =
3699 (CCK == Sema::CCK_OtherCast && !br) ?
3700 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3701 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3702 diag::note_arc_bridge_transfer)
3703 << castExprType << br;
3704
3705 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3706 castType, castExpr, realCast, "__bridge_transfer ",
3707 br ? "CFBridgingRelease" : nullptr);
3708 }
3709
3710 return;
3711 }
3712
3713 // Bridge from a CF type to an ARC type.
3714 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3715 bool br = S.isKnownName("CFBridgingRetain");
3716 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3717 << convKindForDiag
3718 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3719 << castExprType
3720 << 2 // to C pointer type
3721 << castType
3722 << castRange
3723 << castExpr->getSourceRange();
3724 ACCResult CreateRule =
3725 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3726 assert(CreateRule != ACC_bottom && "This cast should already be accepted.")((CreateRule != ACC_bottom && "This cast should already be accepted."
) ? static_cast<void> (0) : __assert_fail ("CreateRule != ACC_bottom && \"This cast should already be accepted.\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 3726, __PRETTY_FUNCTION__))
;
3727 if (CreateRule != ACC_plusOne)
3728 {
3729 DiagnosticBuilder DiagB =
3730 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3731 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3732 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3733 castType, castExpr, realCast, "__bridge ",
3734 nullptr);
3735 }
3736 if (CreateRule != ACC_plusZero)
3737 {
3738 DiagnosticBuilder DiagB =
3739 (CCK == Sema::CCK_OtherCast && !br) ?
3740 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3741 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3742 diag::note_arc_bridge_retained)
3743 << castType << br;
3744
3745 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3746 castType, castExpr, realCast, "__bridge_retained ",
3747 br ? "CFBridgingRetain" : nullptr);
3748 }
3749
3750 return;
3751 }
3752
3753 S.Diag(loc, diag::err_arc_mismatched_cast)
3754 << !convKindForDiag
3755 << srcKind << castExprType << castType
3756 << castRange << castExpr->getSourceRange();
3757}
3758
3759template <typename TB>
3760static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr,
3761 bool &HadTheAttribute, bool warn) {
3762 QualType T = castExpr->getType();
3763 HadTheAttribute = false;
3764 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3765 TypedefNameDecl *TDNDecl = TD->getDecl();
3766 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3767 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3768 HadTheAttribute = true;
3769 if (Parm->isStr("id"))
3770 return true;
3771
3772 NamedDecl *Target = nullptr;
3773 // Check for an existing type with this name.
3774 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3775 Sema::LookupOrdinaryName);
3776 if (S.LookupName(R, S.TUScope)) {
3777 Target = R.getFoundDecl();
3778 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3779 ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3780 if (const ObjCObjectPointerType *InterfacePointerType =
3781 castType->getAsObjCInterfacePointerType()) {
3782 ObjCInterfaceDecl *CastClass
3783 = InterfacePointerType->getObjectType()->getInterface();
3784 if ((CastClass == ExprClass) ||
3785 (CastClass && CastClass->isSuperClassOf(ExprClass)))
3786 return true;
3787 if (warn)
3788 S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge)
3789 << T << Target->getName() << castType->getPointeeType();
3790 return false;
3791 } else if (castType->isObjCIdType() ||
3792 (S.Context.ObjCObjectAdoptsQTypeProtocols(
3793 castType, ExprClass)))
3794 // ok to cast to 'id'.
3795 // casting to id<p-list> is ok if bridge type adopts all of
3796 // p-list protocols.
3797 return true;
3798 else {
3799 if (warn) {
3800 S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge)
3801 << T << Target->getName() << castType;
3802 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3803 S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3804 }
3805 return false;
3806 }
3807 }
3808 } else if (!castType->isObjCIdType()) {
3809 S.Diag(castExpr->getBeginLoc(),
3810 diag::err_objc_cf_bridged_not_interface)
3811 << castExpr->getType() << Parm;
3812 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3813 if (Target)
3814 S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3815 }
3816 return true;
3817 }
3818 return false;
3819 }
3820 T = TDNDecl->getUnderlyingType();
3821 }
3822 return true;
3823}
3824
3825template <typename TB>
3826static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr,
3827 bool &HadTheAttribute, bool warn) {
3828 QualType T = castType;
3829 HadTheAttribute = false;
3830 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3831 TypedefNameDecl *TDNDecl = TD->getDecl();
3832 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3833 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3834 HadTheAttribute = true;
3835 if (Parm->isStr("id"))
3836 return true;
3837
3838 NamedDecl *Target = nullptr;
3839 // Check for an existing type with this name.
3840 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3841 Sema::LookupOrdinaryName);
3842 if (S.LookupName(R, S.TUScope)) {
3843 Target = R.getFoundDecl();
3844 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3845 ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3846 if (const ObjCObjectPointerType *InterfacePointerType =
3847 castExpr->getType()->getAsObjCInterfacePointerType()) {
3848 ObjCInterfaceDecl *ExprClass
3849 = InterfacePointerType->getObjectType()->getInterface();
3850 if ((CastClass == ExprClass) ||
3851 (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3852 return true;
3853 if (warn) {
3854 S.Diag(castExpr->getBeginLoc(),
3855 diag::warn_objc_invalid_bridge_to_cf)
3856 << castExpr->getType()->getPointeeType() << T;
3857 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3858 }
3859 return false;
3860 } else if (castExpr->getType()->isObjCIdType() ||
3861 (S.Context.QIdProtocolsAdoptObjCObjectProtocols(
3862 castExpr->getType(), CastClass)))
3863 // ok to cast an 'id' expression to a CFtype.
3864 // ok to cast an 'id<plist>' expression to CFtype provided plist
3865 // adopts all of CFtype's ObjetiveC's class plist.
3866 return true;
3867 else {
3868 if (warn) {
3869 S.Diag(castExpr->getBeginLoc(),
3870 diag::warn_objc_invalid_bridge_to_cf)
3871 << castExpr->getType() << castType;
3872 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3873 S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3874 }
3875 return false;
3876 }
3877 }
3878 }
3879 S.Diag(castExpr->getBeginLoc(),
3880 diag::err_objc_ns_bridged_invalid_cfobject)
3881 << castExpr->getType() << castType;
3882 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3883 if (Target)
3884 S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3885 return true;
3886 }
3887 return false;
3888 }
3889 T = TDNDecl->getUnderlyingType();
3890 }
3891 return true;
3892}
3893
3894void Sema::CheckTollFreeBridgeCast(QualType castType, Expr *castExpr) {
3895 if (!getLangOpts().ObjC1)
3896 return;
3897 // warn in presence of __bridge casting to or from a toll free bridge cast.
3898 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExpr->getType());
3899 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3900 if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) {
3901 bool HasObjCBridgeAttr;
3902 bool ObjCBridgeAttrWillNotWarn =
3903 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3904 false);
3905 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3906 return;
3907 bool HasObjCBridgeMutableAttr;
3908 bool ObjCBridgeMutableAttrWillNotWarn =
3909 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3910 HasObjCBridgeMutableAttr, false);
3911 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3912 return;
3913
3914 if (HasObjCBridgeAttr)
3915 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3916 true);
3917 else if (HasObjCBridgeMutableAttr)
3918 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3919 HasObjCBridgeMutableAttr, true);
3920 }
3921 else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) {
3922 bool HasObjCBridgeAttr;
3923 bool ObjCBridgeAttrWillNotWarn =
3924 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3925 false);
3926 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3927 return;
3928 bool HasObjCBridgeMutableAttr;
3929 bool ObjCBridgeMutableAttrWillNotWarn =
3930 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3931 HasObjCBridgeMutableAttr, false);
3932 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3933 return;
3934
3935 if (HasObjCBridgeAttr)
3936 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3937 true);
3938 else if (HasObjCBridgeMutableAttr)
3939 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3940 HasObjCBridgeMutableAttr, true);
3941 }
3942}
3943
3944void Sema::CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr) {
3945 QualType SrcType = castExpr->getType();
3946 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) {
3947 if (PRE->isExplicitProperty()) {
3948 if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty())
3949 SrcType = PDecl->getType();
3950 }
3951 else if (PRE->isImplicitProperty()) {
3952 if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter())
3953 SrcType = Getter->getReturnType();
3954 }
3955 }
3956
3957 ARCConversionTypeClass srcExprACTC = classifyTypeForARCConversion(SrcType);
3958 ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType);
3959 if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation)
3960 return;
3961 CheckObjCBridgeRelatedConversions(castExpr->getBeginLoc(), castType, SrcType,
3962 castExpr);
3963}
3964
3965bool Sema::CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr,
3966 CastKind &Kind) {
3967 if (!getLangOpts().ObjC1)
3968 return false;
3969 ARCConversionTypeClass exprACTC =
3970 classifyTypeForARCConversion(castExpr->getType());
3971 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3972 if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) ||
3973 (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) {
3974 CheckTollFreeBridgeCast(castType, castExpr);
3975 Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast
3976 : CK_CPointerToObjCPointerCast;
3977 return true;
3978 }
3979 return false;
3980}
3981
3982bool Sema::checkObjCBridgeRelatedComponents(SourceLocation Loc,
3983 QualType DestType, QualType SrcType,
3984 ObjCInterfaceDecl *&RelatedClass,
3985 ObjCMethodDecl *&ClassMethod,
3986 ObjCMethodDecl *&InstanceMethod,
3987 TypedefNameDecl *&TDNDecl,
3988 bool CfToNs, bool Diagnose) {
3989 QualType T = CfToNs ? SrcType : DestType;
3990 ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl);
3991 if (!ObjCBAttr)
3992 return false;
3993
3994 IdentifierInfo *RCId = ObjCBAttr->getRelatedClass();
3995 IdentifierInfo *CMId = ObjCBAttr->getClassMethod();
3996 IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod();
3997 if (!RCId)
3998 return false;
3999 NamedDecl *Target = nullptr;
4000 // Check for an existing type with this name.
4001 LookupResult R(*this, DeclarationName(RCId), SourceLocation(),
4002 Sema::LookupOrdinaryName);
4003 if (!LookupName(R, TUScope)) {
4004 if (Diagnose) {
4005 Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId
4006 << SrcType << DestType;
4007 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4008 }
4009 return false;
4010 }
4011 Target = R.getFoundDecl();
4012 if (Target && isa<ObjCInterfaceDecl>(Target))
4013 RelatedClass = cast<ObjCInterfaceDecl>(Target);
4014 else {
4015 if (Diagnose) {
4016 Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId
4017 << SrcType << DestType;
4018 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4019 if (Target)
4020 Diag(Target->getBeginLoc(), diag::note_declared_at);
4021 }
4022 return false;
4023 }
4024
4025 // Check for an existing class method with the given selector name.
4026 if (CfToNs && CMId) {
4027 Selector Sel = Context.Selectors.getUnarySelector(CMId);
4028 ClassMethod = RelatedClass->lookupMethod(Sel, false);
4029 if (!ClassMethod) {
4030 if (Diagnose) {
4031 Diag(Loc, diag::err_objc_bridged_related_known_method)
4032 << SrcType << DestType << Sel << false;
4033 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4034 }
4035 return false;
4036 }
4037 }
4038
4039 // Check for an existing instance method with the given selector name.
4040 if (!CfToNs && IMId) {
4041 Selector Sel = Context.Selectors.getNullarySelector(IMId);
4042 InstanceMethod = RelatedClass->lookupMethod(Sel, true);
4043 if (!InstanceMethod) {
4044 if (Diagnose) {
4045 Diag(Loc, diag::err_objc_bridged_related_known_method)
4046 << SrcType << DestType << Sel << true;
4047 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4048 }
4049 return false;
4050 }
4051 }
4052 return true;
4053}
4054
4055bool
4056Sema::CheckObjCBridgeRelatedConversions(SourceLocation Loc,
4057 QualType DestType, QualType SrcType,
4058 Expr *&SrcExpr, bool Diagnose) {
4059 ARCConversionTypeClass rhsExprACTC = classifyTypeForARCConversion(SrcType);
4060 ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType);
4061 bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable);
4062 bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation);
4063 if (!CfToNs && !NsToCf)
4064 return false;
4065
4066 ObjCInterfaceDecl *RelatedClass;
4067 ObjCMethodDecl *ClassMethod = nullptr;
4068 ObjCMethodDecl *InstanceMethod = nullptr;
4069 TypedefNameDecl *TDNDecl = nullptr;
4070 if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass,
4071 ClassMethod, InstanceMethod, TDNDecl,
4072 CfToNs, Diagnose))
4073 return false;
4074
4075 if (CfToNs) {
4076 // Implicit conversion from CF to ObjC object is needed.
4077 if (ClassMethod) {
4078 if (Diagnose) {
4079 std::string ExpressionString = "[";
4080 ExpressionString += RelatedClass->getNameAsString();
4081 ExpressionString += " ";
4082 ExpressionString += ClassMethod->getSelector().getAsString();
4083 SourceLocation SrcExprEndLoc =
4084 getLocForEndOfToken(SrcExpr->getEndLoc());
4085 // Provide a fixit: [RelatedClass ClassMethod SrcExpr]
4086 Diag(Loc, diag::err_objc_bridged_related_known_method)
4087 << SrcType << DestType << ClassMethod->getSelector() << false
4088 << FixItHint::CreateInsertion(SrcExpr->getBeginLoc(),
4089 ExpressionString)
4090 << FixItHint::CreateInsertion(SrcExprEndLoc, "]");
4091 Diag(RelatedClass->getBeginLoc(), diag::note_declared_at);
4092 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4093
4094 QualType receiverType = Context.getObjCInterfaceType(RelatedClass);
4095 // Argument.
4096 Expr *args[] = { SrcExpr };
4097 ExprResult msg = BuildClassMessageImplicit(receiverType, false,
4098 ClassMethod->getLocation(),
4099 ClassMethod->getSelector(), ClassMethod,
4100 MultiExprArg(args, 1));
4101 SrcExpr = msg.get();
4102 }
4103 return true;
4104 }
4105 }
4106 else {
4107 // Implicit conversion from ObjC type to CF object is needed.
4108 if (InstanceMethod) {
4109 if (Diagnose) {
4110 std::string ExpressionString;
4111 SourceLocation SrcExprEndLoc =
4112 getLocForEndOfToken(SrcExpr->getEndLoc());
4113 if (InstanceMethod->isPropertyAccessor())
4114 if (const ObjCPropertyDecl *PDecl =
4115 InstanceMethod->findPropertyDecl()) {
4116 // fixit: ObjectExpr.propertyname when it is aproperty accessor.
4117 ExpressionString = ".";
4118 ExpressionString += PDecl->getNameAsString();
4119 Diag(Loc, diag::err_objc_bridged_related_known_method)
4120 << SrcType << DestType << InstanceMethod->getSelector() << true
4121 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4122 }
4123 if (ExpressionString.empty()) {
4124 // Provide a fixit: [ObjectExpr InstanceMethod]
4125 ExpressionString = " ";
4126 ExpressionString += InstanceMethod->getSelector().getAsString();
4127 ExpressionString += "]";
4128
4129 Diag(Loc, diag::err_objc_bridged_related_known_method)
4130 << SrcType << DestType << InstanceMethod->getSelector() << true
4131 << FixItHint::CreateInsertion(SrcExpr->getBeginLoc(), "[")
4132 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4133 }
4134 Diag(RelatedClass->getBeginLoc(), diag::note_declared_at);
4135 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4136
4137 ExprResult msg =
4138 BuildInstanceMessageImplicit(SrcExpr, SrcType,
4139 InstanceMethod->getLocation(),
4140 InstanceMethod->getSelector(),
4141 InstanceMethod, None);
4142 SrcExpr = msg.get();
4143 }
4144 return true;
4145 }
4146 }
4147 return false;
4148}
4149
4150Sema::ARCConversionResult
4151Sema::CheckObjCConversion(SourceRange castRange, QualType castType,
4152 Expr *&castExpr, CheckedConversionKind CCK,
4153 bool Diagnose, bool DiagnoseCFAudited,
4154 BinaryOperatorKind Opc) {
4155 QualType castExprType = castExpr->getType();
4156
4157 // For the purposes of the classification, we assume reference types
4158 // will bind to temporaries.
4159 QualType effCastType = castType;
4160 if (const ReferenceType *ref = castType->getAs<ReferenceType>())
4161 effCastType = ref->getPointeeType();
4162
4163 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
4164 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
4165 if (exprACTC == castACTC) {
4166 // Check for viability and report error if casting an rvalue to a
4167 // life-time qualifier.
4168 if (castACTC == ACTC_retainable &&
4169 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
4170 castType != castExprType) {
4171 const Type *DT = castType.getTypePtr();
4172 QualType QDT = castType;
4173 // We desugar some types but not others. We ignore those
4174 // that cannot happen in a cast; i.e. auto, and those which
4175 // should not be de-sugared; i.e typedef.
4176 if (const ParenType *PT = dyn_cast<ParenType>(DT))
4177 QDT = PT->desugar();
4178 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
4179 QDT = TP->desugar();
4180 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
4181 QDT = AT->desugar();
4182 if (QDT != castType &&
4183 QDT.getObjCLifetime() != Qualifiers::OCL_None) {
4184 if (Diagnose) {
4185 SourceLocation loc = (castRange.isValid() ? castRange.getBegin()
4186 : castExpr->getExprLoc());
4187 Diag(loc, diag::err_arc_nolifetime_behavior);
4188 }
4189 return ACR_error;
4190 }
4191 }
4192 return ACR_okay;
4193 }
4194
4195 // The life-time qualifier cast check above is all we need for ObjCWeak.
4196 // ObjCAutoRefCount has more restrictions on what is legal.
4197 if (!getLangOpts().ObjCAutoRefCount)
4198 return ACR_okay;
4199
4200 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
4201
4202 // Allow all of these types to be cast to integer types (but not
4203 // vice-versa).
4204 if (castACTC == ACTC_none && castType->isIntegralType(Context))
4205 return ACR_okay;
4206
4207 // Allow casts between pointers to lifetime types (e.g., __strong id*)
4208 // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
4209 // must be explicit.
4210 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
4211 return ACR_okay;
4212 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
4213 isCast(CCK))
4214 return ACR_okay;
4215
4216 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
4217 // For invalid casts, fall through.
4218 case ACC_invalid:
4219 break;
4220
4221 // Do nothing for both bottom and +0.
4222 case ACC_bottom:
4223 case ACC_plusZero:
4224 return ACR_okay;
4225
4226 // If the result is +1, consume it here.
4227 case ACC_plusOne:
4228 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
4229 CK_ARCConsumeObject, castExpr,
4230 nullptr, VK_RValue);
4231 Cleanup.setExprNeedsCleanups(true);
4232 return ACR_okay;
4233 }
4234
4235 // If this is a non-implicit cast from id or block type to a
4236 // CoreFoundation type, delay complaining in case the cast is used
4237 // in an acceptable context.
4238 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) && isCast(CCK))
4239 return ACR_unbridged;
4240
4241 // Issue a diagnostic about a missing @-sign when implicit casting a cstring
4242 // to 'NSString *', instead of falling through to report a "bridge cast"
4243 // diagnostic.
4244 if (castACTC == ACTC_retainable && exprACTC == ACTC_none &&
4245 ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose))
4246 return ACR_error;
4247
4248 // Do not issue "bridge cast" diagnostic when implicit casting
4249 // a retainable object to a CF type parameter belonging to an audited
4250 // CF API function. Let caller issue a normal type mismatched diagnostic
4251 // instead.
4252 if ((!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
4253 castACTC != ACTC_coreFoundation) &&
4254 !(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable &&
4255 (Opc == BO_NE || Opc == BO_EQ))) {
4256 if (Diagnose)
4257 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr,
4258 castExpr, exprACTC, CCK);
4259 return ACR_error;
4260 }
4261 return ACR_okay;
4262}
4263
4264/// Given that we saw an expression with the ARCUnbridgedCastTy
4265/// placeholder type, complain bitterly.
4266void Sema::diagnoseARCUnbridgedCast(Expr *e) {
4267 // We expect the spurious ImplicitCastExpr to already have been stripped.
4268 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast))((!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)) ?
static_cast<void> (0) : __assert_fail ("!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4268, __PRETTY_FUNCTION__))
;
4269 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
4270
4271 SourceRange castRange;
4272 QualType castType;
4273 CheckedConversionKind CCK;
4274
4275 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
4276 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
4277 castType = cast->getTypeAsWritten();
4278 CCK = CCK_CStyleCast;
4279 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
4280 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
4281 castType = cast->getTypeAsWritten();
4282 CCK = CCK_OtherCast;
4283 } else {
4284 llvm_unreachable("Unexpected ImplicitCastExpr")::llvm::llvm_unreachable_internal("Unexpected ImplicitCastExpr"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4284)
;
4285 }
4286
4287 ARCConversionTypeClass castACTC =
4288 classifyTypeForARCConversion(castType.getNonReferenceType());
4289
4290 Expr *castExpr = realCast->getSubExpr();
4291 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable)((classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable
) ? static_cast<void> (0) : __assert_fail ("classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4291, __PRETTY_FUNCTION__))
;
4292
4293 diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4294 castExpr, realCast, ACTC_retainable, CCK);
4295}
4296
4297/// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
4298/// type, remove the placeholder cast.
4299Expr *Sema::stripARCUnbridgedCast(Expr *e) {
4300 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast))((e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)) ? static_cast
<void> (0) : __assert_fail ("e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4300, __PRETTY_FUNCTION__))
;
4301
4302 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
4303 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
4304 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
4305 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
4306 assert(uo->getOpcode() == UO_Extension)((uo->getOpcode() == UO_Extension) ? static_cast<void>
(0) : __assert_fail ("uo->getOpcode() == UO_Extension", "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4306, __PRETTY_FUNCTION__))
;
4307 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
4308 return new (Context)
4309 UnaryOperator(sub, UO_Extension, sub->getType(), sub->getValueKind(),
4310 sub->getObjectKind(), uo->getOperatorLoc(), false);
4311 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
4312 assert(!gse->isResultDependent())((!gse->isResultDependent()) ? static_cast<void> (0)
: __assert_fail ("!gse->isResultDependent()", "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4312, __PRETTY_FUNCTION__))
;
4313
4314 unsigned n = gse->getNumAssocs();
4315 SmallVector<Expr*, 4> subExprs(n);
4316 SmallVector<TypeSourceInfo*, 4> subTypes(n);
4317 for (unsigned i = 0; i != n; ++i) {
4318 subTypes[i] = gse->getAssocTypeSourceInfo(i);
4319 Expr *sub = gse->getAssocExpr(i);
4320 if (i == gse->getResultIndex())
4321 sub = stripARCUnbridgedCast(sub);
4322 subExprs[i] = sub;
4323 }
4324
4325 return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(),
4326 gse->getControllingExpr(),
4327 subTypes, subExprs,
4328 gse->getDefaultLoc(),
4329 gse->getRParenLoc(),
4330 gse->containsUnexpandedParameterPack(),
4331 gse->getResultIndex());
4332 } else {
4333 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!")((isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!"
) ? static_cast<void> (0) : __assert_fail ("isa<ImplicitCastExpr>(e) && \"bad form of unbridged cast!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4333, __PRETTY_FUNCTION__))
;
4334 return cast<ImplicitCastExpr>(e)->getSubExpr();
4335 }
4336}
4337
4338bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType,
4339 QualType exprType) {
4340 QualType canCastType =
4341 Context.getCanonicalType(castType).getUnqualifiedType();
4342 QualType canExprType =
4343 Context.getCanonicalType(exprType).getUnqualifiedType();
4344 if (isa<ObjCObjectPointerType>(canCastType) &&
4345 castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
4346 canExprType->isObjCObjectPointerType()) {
4347 if (const ObjCObjectPointerType *ObjT =
4348 canExprType->getAs<ObjCObjectPointerType>())
4349 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
4350 return !ObjI->isArcWeakrefUnavailable();
4351 }
4352 return true;
4353}
4354
4355/// Look for an ObjCReclaimReturnedObject cast and destroy it.
4356static Expr *maybeUndoReclaimObject(Expr *e) {
4357 Expr *curExpr = e, *prevExpr = nullptr;
4358
4359 // Walk down the expression until we hit an implicit cast of kind
4360 // ARCReclaimReturnedObject or an Expr that is neither a Paren nor a Cast.
4361 while (true) {
4362 if (auto *pe = dyn_cast<ParenExpr>(curExpr)) {
4363 prevExpr = curExpr;
4364 curExpr = pe->getSubExpr();
4365 continue;
4366 }
4367
4368 if (auto *ce = dyn_cast<CastExpr>(curExpr)) {
4369 if (auto *ice = dyn_cast<ImplicitCastExpr>(ce))
4370 if (ice->getCastKind() == CK_ARCReclaimReturnedObject) {
4371 if (!prevExpr)
4372 return ice->getSubExpr();
4373 if (auto *pe = dyn_cast<ParenExpr>(prevExpr))
4374 pe->setSubExpr(ice->getSubExpr());
4375 else
4376 cast<CastExpr>(prevExpr)->setSubExpr(ice->getSubExpr());
4377 return e;
4378 }
4379
4380 prevExpr = curExpr;
4381 curExpr = ce->getSubExpr();
4382 continue;
4383 }
4384
4385 // Break out of the loop if curExpr is neither a Paren nor a Cast.
4386 break;
4387 }
4388
4389 return e;
4390}
4391
4392ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc,
4393 ObjCBridgeCastKind Kind,
4394 SourceLocation BridgeKeywordLoc,
4395 TypeSourceInfo *TSInfo,
4396 Expr *SubExpr) {
4397 ExprResult SubResult = UsualUnaryConversions(SubExpr);
4398 if (SubResult.isInvalid()) return ExprError();
4399 SubExpr = SubResult.get();
4400
4401 QualType T = TSInfo->getType();
4402 QualType FromType = SubExpr->getType();
4403
4404 CastKind CK;
4405
4406 bool MustConsume = false;
4407 if (T->isDependentType() || SubExpr->isTypeDependent()) {
4408 // Okay: we'll build a dependent expression type.
4409 CK = CK_Dependent;
4410 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
4411 // Casting CF -> id
4412 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
4413 : CK_CPointerToObjCPointerCast);
4414 switch (Kind) {
4415 case OBC_Bridge:
4416 break;
4417
4418 case OBC_BridgeRetained: {
4419 bool br = isKnownName("CFBridgingRelease");
4420 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4421 << 2
4422 << FromType
4423 << (T->isBlockPointerType()? 1 : 0)
4424 << T
4425 << SubExpr->getSourceRange()
4426 << Kind;
4427 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4428 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
4429 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
4430 << FromType << br
4431 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4432 br ? "CFBridgingRelease "
4433 : "__bridge_transfer ");
4434
4435 Kind = OBC_Bridge;
4436 break;
4437 }
4438
4439 case OBC_BridgeTransfer:
4440 // We must consume the Objective-C object produced by the cast.
4441 MustConsume = true;
4442 break;
4443 }
4444 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
4445 // Okay: id -> CF
4446 CK = CK_BitCast;
4447 switch (Kind) {
4448 case OBC_Bridge:
4449 // Reclaiming a value that's going to be __bridge-casted to CF
4450 // is very dangerous, so we don't do it.
4451 SubExpr = maybeUndoReclaimObject(SubExpr);
4452 break;
4453
4454 case OBC_BridgeRetained:
4455 // Produce the object before casting it.
4456 SubExpr = ImplicitCastExpr::Create(Context, FromType,
4457 CK_ARCProduceObject,
4458 SubExpr, nullptr, VK_RValue);
4459 break;
4460
4461 case OBC_BridgeTransfer: {
4462 bool br = isKnownName("CFBridgingRetain");
4463 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4464 << (FromType->isBlockPointerType()? 1 : 0)
4465 << FromType
4466 << 2
4467 << T
4468 << SubExpr->getSourceRange()
4469 << Kind;
4470
4471 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4472 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
4473 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
4474 << T << br
4475 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4476 br ? "CFBridgingRetain " : "__bridge_retained");
4477
4478 Kind = OBC_Bridge;
4479 break;
4480 }
4481 }
4482 } else {
4483 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
4484 << FromType << T << Kind
4485 << SubExpr->getSourceRange()
4486 << TSInfo->getTypeLoc().getSourceRange();
4487 return ExprError();
4488 }
4489
4490 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
4491 BridgeKeywordLoc,
4492 TSInfo, SubExpr);
4493
4494 if (MustConsume) {
4495 Cleanup.setExprNeedsCleanups(true);
4496 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
4497 nullptr, VK_RValue);
4498 }
4499
4500 return Result;
4501}
4502
4503ExprResult Sema::ActOnObjCBridgedCast(Scope *S,
4504 SourceLocation LParenLoc,
4505 ObjCBridgeCastKind Kind,
4506 SourceLocation BridgeKeywordLoc,
4507 ParsedType Type,
4508 SourceLocation RParenLoc,
4509 Expr *SubExpr) {
4510 TypeSourceInfo *TSInfo = nullptr;
4511 QualType T = GetTypeFromParser(Type, &TSInfo);
4512 if (Kind == OBC_Bridge)
4513 CheckTollFreeBridgeCast(T, SubExpr);
4514 if (!TSInfo)
4515 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
4516 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,
4517 SubExpr);
4518}