1 //===--- SemaPseudoObject.cpp - Semantic Analysis for Pseudo-Objects ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements semantic analysis for expressions involving
11 // pseudo-object references. Pseudo-objects are conceptual objects
12 // whose storage is entirely abstract and all accesses to which are
13 // translated through some sort of abstraction barrier.
15 // For example, Objective-C objects can have "properties", either
16 // declared or undeclared. A property may be accessed by writing
18 // where 'expr' is an r-value of Objective-C pointer type and 'prop'
19 // is the name of the property. If this expression is used in a context
20 // needing an r-value, it is treated as if it were a message-send
21 // of the associated 'getter' selector, typically:
23 // If it is used as the LHS of a simple assignment, it is treated
24 // as a message-send of the associated 'setter' selector, typically:
25 // [expr setProp: RHS]
26 // If it is used as the LHS of a compound assignment, or the operand
27 // of a unary increment or decrement, both are required; for example,
28 // 'expr.prop *= 100' would be translated to:
29 // [expr setProp: [expr prop] * 100]
31 //===----------------------------------------------------------------------===//
33 #include "clang/Sema/SemaInternal.h"
34 #include "clang/AST/ExprCXX.h"
35 #include "clang/AST/ExprObjC.h"
36 #include "clang/Basic/CharInfo.h"
37 #include "clang/Lex/Preprocessor.h"
38 #include "clang/Sema/Initialization.h"
39 #include "clang/Sema/ScopeInfo.h"
40 #include "llvm/ADT/SmallString.h"
42 using namespace clang;
46 // Basically just a very focused copy of TreeTransform.
49 unsigned MSPropertySubscriptCount;
50 typedef llvm::function_ref<Expr *(Expr *, unsigned)> SpecificRebuilderRefTy;
51 const SpecificRebuilderRefTy &SpecificCallback;
52 Rebuilder(Sema &S, const SpecificRebuilderRefTy &SpecificCallback)
53 : S(S), MSPropertySubscriptCount(0),
54 SpecificCallback(SpecificCallback) {}
56 Expr *rebuildObjCPropertyRefExpr(ObjCPropertyRefExpr *refExpr) {
57 // Fortunately, the constraint that we're rebuilding something
58 // with a base limits the number of cases here.
59 if (refExpr->isClassReceiver() || refExpr->isSuperReceiver())
62 if (refExpr->isExplicitProperty()) {
63 return new (S.Context) ObjCPropertyRefExpr(
64 refExpr->getExplicitProperty(), refExpr->getType(),
65 refExpr->getValueKind(), refExpr->getObjectKind(),
66 refExpr->getLocation(), SpecificCallback(refExpr->getBase(), 0));
68 return new (S.Context) ObjCPropertyRefExpr(
69 refExpr->getImplicitPropertyGetter(),
70 refExpr->getImplicitPropertySetter(), refExpr->getType(),
71 refExpr->getValueKind(), refExpr->getObjectKind(),
72 refExpr->getLocation(), SpecificCallback(refExpr->getBase(), 0));
74 Expr *rebuildObjCSubscriptRefExpr(ObjCSubscriptRefExpr *refExpr) {
75 assert(refExpr->getBaseExpr());
76 assert(refExpr->getKeyExpr());
78 return new (S.Context) ObjCSubscriptRefExpr(
79 SpecificCallback(refExpr->getBaseExpr(), 0),
80 SpecificCallback(refExpr->getKeyExpr(), 1), refExpr->getType(),
81 refExpr->getValueKind(), refExpr->getObjectKind(),
82 refExpr->getAtIndexMethodDecl(), refExpr->setAtIndexMethodDecl(),
83 refExpr->getRBracket());
85 Expr *rebuildMSPropertyRefExpr(MSPropertyRefExpr *refExpr) {
86 assert(refExpr->getBaseExpr());
88 return new (S.Context) MSPropertyRefExpr(
89 SpecificCallback(refExpr->getBaseExpr(), 0),
90 refExpr->getPropertyDecl(), refExpr->isArrow(), refExpr->getType(),
91 refExpr->getValueKind(), refExpr->getQualifierLoc(),
92 refExpr->getMemberLoc());
94 Expr *rebuildMSPropertySubscriptExpr(MSPropertySubscriptExpr *refExpr) {
95 assert(refExpr->getBase());
96 assert(refExpr->getIdx());
98 auto *NewBase = rebuild(refExpr->getBase());
99 ++MSPropertySubscriptCount;
100 return new (S.Context) MSPropertySubscriptExpr(
102 SpecificCallback(refExpr->getIdx(), MSPropertySubscriptCount),
103 refExpr->getType(), refExpr->getValueKind(), refExpr->getObjectKind(),
104 refExpr->getRBracketLoc());
107 Expr *rebuild(Expr *e) {
108 // Fast path: nothing to look through.
109 if (auto *PRE = dyn_cast<ObjCPropertyRefExpr>(e))
110 return rebuildObjCPropertyRefExpr(PRE);
111 if (auto *SRE = dyn_cast<ObjCSubscriptRefExpr>(e))
112 return rebuildObjCSubscriptRefExpr(SRE);
113 if (auto *MSPRE = dyn_cast<MSPropertyRefExpr>(e))
114 return rebuildMSPropertyRefExpr(MSPRE);
115 if (auto *MSPSE = dyn_cast<MSPropertySubscriptExpr>(e))
116 return rebuildMSPropertySubscriptExpr(MSPSE);
118 // Otherwise, we should look through and rebuild anything that
119 // IgnoreParens would.
121 if (ParenExpr *parens = dyn_cast<ParenExpr>(e)) {
122 e = rebuild(parens->getSubExpr());
123 return new (S.Context) ParenExpr(parens->getLParen(),
128 if (UnaryOperator *uop = dyn_cast<UnaryOperator>(e)) {
129 assert(uop->getOpcode() == UO_Extension);
130 e = rebuild(uop->getSubExpr());
131 return new (S.Context) UnaryOperator(e, uop->getOpcode(),
134 uop->getObjectKind(),
135 uop->getOperatorLoc());
138 if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
139 assert(!gse->isResultDependent());
140 unsigned resultIndex = gse->getResultIndex();
141 unsigned numAssocs = gse->getNumAssocs();
143 SmallVector<Expr*, 8> assocs(numAssocs);
144 SmallVector<TypeSourceInfo*, 8> assocTypes(numAssocs);
146 for (unsigned i = 0; i != numAssocs; ++i) {
147 Expr *assoc = gse->getAssocExpr(i);
148 if (i == resultIndex) assoc = rebuild(assoc);
150 assocTypes[i] = gse->getAssocTypeSourceInfo(i);
153 return new (S.Context) GenericSelectionExpr(S.Context,
154 gse->getGenericLoc(),
155 gse->getControllingExpr(),
158 gse->getDefaultLoc(),
160 gse->containsUnexpandedParameterPack(),
164 if (ChooseExpr *ce = dyn_cast<ChooseExpr>(e)) {
165 assert(!ce->isConditionDependent());
167 Expr *LHS = ce->getLHS(), *RHS = ce->getRHS();
168 Expr *&rebuiltExpr = ce->isConditionTrue() ? LHS : RHS;
169 rebuiltExpr = rebuild(rebuiltExpr);
171 return new (S.Context) ChooseExpr(ce->getBuiltinLoc(),
174 rebuiltExpr->getType(),
175 rebuiltExpr->getValueKind(),
176 rebuiltExpr->getObjectKind(),
178 ce->isConditionTrue(),
179 rebuiltExpr->isTypeDependent(),
180 rebuiltExpr->isValueDependent());
183 llvm_unreachable("bad expression to rebuild!");
187 class PseudoOpBuilder {
190 unsigned ResultIndex;
191 SourceLocation GenericLoc;
192 SmallVector<Expr *, 4> Semantics;
194 PseudoOpBuilder(Sema &S, SourceLocation genericLoc)
195 : S(S), ResultIndex(PseudoObjectExpr::NoResult),
196 GenericLoc(genericLoc) {}
198 virtual ~PseudoOpBuilder() {}
200 /// Add a normal semantic expression.
201 void addSemanticExpr(Expr *semantic) {
202 Semantics.push_back(semantic);
205 /// Add the 'result' semantic expression.
206 void addResultSemanticExpr(Expr *resultExpr) {
207 assert(ResultIndex == PseudoObjectExpr::NoResult);
208 ResultIndex = Semantics.size();
209 Semantics.push_back(resultExpr);
212 ExprResult buildRValueOperation(Expr *op);
213 ExprResult buildAssignmentOperation(Scope *Sc,
214 SourceLocation opLoc,
215 BinaryOperatorKind opcode,
216 Expr *LHS, Expr *RHS);
217 ExprResult buildIncDecOperation(Scope *Sc, SourceLocation opLoc,
218 UnaryOperatorKind opcode,
221 virtual ExprResult complete(Expr *syntacticForm);
223 OpaqueValueExpr *capture(Expr *op);
224 OpaqueValueExpr *captureValueAsResult(Expr *op);
226 void setResultToLastSemantic() {
227 assert(ResultIndex == PseudoObjectExpr::NoResult);
228 ResultIndex = Semantics.size() - 1;
231 /// Return true if assignments have a non-void result.
232 static bool CanCaptureValue(Expr *exp) {
233 if (exp->isGLValue())
235 QualType ty = exp->getType();
236 assert(!ty->isIncompleteType());
237 assert(!ty->isDependentType());
239 if (const CXXRecordDecl *ClassDecl = ty->getAsCXXRecordDecl())
240 return ClassDecl->isTriviallyCopyable();
244 virtual Expr *rebuildAndCaptureObject(Expr *) = 0;
245 virtual ExprResult buildGet() = 0;
246 virtual ExprResult buildSet(Expr *, SourceLocation,
247 bool captureSetValueAsResult) = 0;
248 /// \brief Should the result of an assignment be the formal result of the
249 /// setter call or the value that was passed to the setter?
251 /// Different pseudo-object language features use different language rules
253 /// The default is to use the set value. Currently, this affects the
254 /// behavior of simple assignments, compound assignments, and prefix
255 /// increment and decrement.
256 /// Postfix increment and decrement always use the getter result as the
257 /// expression result.
259 /// If this method returns true, and the set value isn't capturable for
260 /// some reason, the result of the expression will be void.
261 virtual bool captureSetValueAsResult() const { return true; }
264 /// A PseudoOpBuilder for Objective-C \@properties.
265 class ObjCPropertyOpBuilder : public PseudoOpBuilder {
266 ObjCPropertyRefExpr *RefExpr;
267 ObjCPropertyRefExpr *SyntacticRefExpr;
268 OpaqueValueExpr *InstanceReceiver;
269 ObjCMethodDecl *Getter;
271 ObjCMethodDecl *Setter;
272 Selector SetterSelector;
273 Selector GetterSelector;
276 ObjCPropertyOpBuilder(Sema &S, ObjCPropertyRefExpr *refExpr) :
277 PseudoOpBuilder(S, refExpr->getLocation()), RefExpr(refExpr),
278 SyntacticRefExpr(nullptr), InstanceReceiver(nullptr), Getter(nullptr),
282 ExprResult buildRValueOperation(Expr *op);
283 ExprResult buildAssignmentOperation(Scope *Sc,
284 SourceLocation opLoc,
285 BinaryOperatorKind opcode,
286 Expr *LHS, Expr *RHS);
287 ExprResult buildIncDecOperation(Scope *Sc, SourceLocation opLoc,
288 UnaryOperatorKind opcode,
291 bool tryBuildGetOfReference(Expr *op, ExprResult &result);
292 bool findSetter(bool warn=true);
294 void DiagnoseUnsupportedPropertyUse();
296 Expr *rebuildAndCaptureObject(Expr *syntacticBase) override;
297 ExprResult buildGet() override;
298 ExprResult buildSet(Expr *op, SourceLocation, bool) override;
299 ExprResult complete(Expr *SyntacticForm) override;
301 bool isWeakProperty() const;
304 /// A PseudoOpBuilder for Objective-C array/dictionary indexing.
305 class ObjCSubscriptOpBuilder : public PseudoOpBuilder {
306 ObjCSubscriptRefExpr *RefExpr;
307 OpaqueValueExpr *InstanceBase;
308 OpaqueValueExpr *InstanceKey;
309 ObjCMethodDecl *AtIndexGetter;
310 Selector AtIndexGetterSelector;
312 ObjCMethodDecl *AtIndexSetter;
313 Selector AtIndexSetterSelector;
316 ObjCSubscriptOpBuilder(Sema &S, ObjCSubscriptRefExpr *refExpr) :
317 PseudoOpBuilder(S, refExpr->getSourceRange().getBegin()),
319 InstanceBase(nullptr), InstanceKey(nullptr),
320 AtIndexGetter(nullptr), AtIndexSetter(nullptr) {}
322 ExprResult buildRValueOperation(Expr *op);
323 ExprResult buildAssignmentOperation(Scope *Sc,
324 SourceLocation opLoc,
325 BinaryOperatorKind opcode,
326 Expr *LHS, Expr *RHS);
327 Expr *rebuildAndCaptureObject(Expr *syntacticBase) override;
329 bool findAtIndexGetter();
330 bool findAtIndexSetter();
332 ExprResult buildGet() override;
333 ExprResult buildSet(Expr *op, SourceLocation, bool) override;
336 class MSPropertyOpBuilder : public PseudoOpBuilder {
337 MSPropertyRefExpr *RefExpr;
338 OpaqueValueExpr *InstanceBase;
339 SmallVector<Expr *, 4> CallArgs;
341 MSPropertyRefExpr *getBaseMSProperty(MSPropertySubscriptExpr *E);
344 MSPropertyOpBuilder(Sema &S, MSPropertyRefExpr *refExpr) :
345 PseudoOpBuilder(S, refExpr->getSourceRange().getBegin()),
346 RefExpr(refExpr), InstanceBase(nullptr) {}
347 MSPropertyOpBuilder(Sema &S, MSPropertySubscriptExpr *refExpr)
348 : PseudoOpBuilder(S, refExpr->getSourceRange().getBegin()),
349 InstanceBase(nullptr) {
350 RefExpr = getBaseMSProperty(refExpr);
353 Expr *rebuildAndCaptureObject(Expr *) override;
354 ExprResult buildGet() override;
355 ExprResult buildSet(Expr *op, SourceLocation, bool) override;
356 bool captureSetValueAsResult() const override { return false; }
360 /// Capture the given expression in an OpaqueValueExpr.
361 OpaqueValueExpr *PseudoOpBuilder::capture(Expr *e) {
362 // Make a new OVE whose source is the given expression.
363 OpaqueValueExpr *captured =
364 new (S.Context) OpaqueValueExpr(GenericLoc, e->getType(),
365 e->getValueKind(), e->getObjectKind(),
368 // Make sure we bind that in the semantics.
369 addSemanticExpr(captured);
373 /// Capture the given expression as the result of this pseudo-object
374 /// operation. This routine is safe against expressions which may
375 /// already be captured.
377 /// \returns the captured expression, which will be the
378 /// same as the input if the input was already captured
379 OpaqueValueExpr *PseudoOpBuilder::captureValueAsResult(Expr *e) {
380 assert(ResultIndex == PseudoObjectExpr::NoResult);
382 // If the expression hasn't already been captured, just capture it
383 // and set the new semantic
384 if (!isa<OpaqueValueExpr>(e)) {
385 OpaqueValueExpr *cap = capture(e);
386 setResultToLastSemantic();
390 // Otherwise, it must already be one of our semantic expressions;
391 // set ResultIndex to its index.
394 assert(index < Semantics.size() &&
395 "captured expression not found in semantics!");
396 if (e == Semantics[index]) break;
399 return cast<OpaqueValueExpr>(e);
402 /// The routine which creates the final PseudoObjectExpr.
403 ExprResult PseudoOpBuilder::complete(Expr *syntactic) {
404 return PseudoObjectExpr::Create(S.Context, syntactic,
405 Semantics, ResultIndex);
408 /// The main skeleton for building an r-value operation.
409 ExprResult PseudoOpBuilder::buildRValueOperation(Expr *op) {
410 Expr *syntacticBase = rebuildAndCaptureObject(op);
412 ExprResult getExpr = buildGet();
413 if (getExpr.isInvalid()) return ExprError();
414 addResultSemanticExpr(getExpr.get());
416 return complete(syntacticBase);
419 /// The basic skeleton for building a simple or compound
420 /// assignment operation.
422 PseudoOpBuilder::buildAssignmentOperation(Scope *Sc, SourceLocation opcLoc,
423 BinaryOperatorKind opcode,
424 Expr *LHS, Expr *RHS) {
425 assert(BinaryOperator::isAssignmentOp(opcode));
427 Expr *syntacticLHS = rebuildAndCaptureObject(LHS);
428 OpaqueValueExpr *capturedRHS = capture(RHS);
430 // In some very specific cases, semantic analysis of the RHS as an
431 // expression may require it to be rewritten. In these cases, we
432 // cannot safely keep the OVE around. Fortunately, we don't really
433 // need to: we don't use this particular OVE in multiple places, and
434 // no clients rely that closely on matching up expressions in the
435 // semantic expression with expressions from the syntactic form.
436 Expr *semanticRHS = capturedRHS;
437 if (RHS->hasPlaceholderType() || isa<InitListExpr>(RHS)) {
439 Semantics.pop_back();
445 if (opcode == BO_Assign) {
446 result = semanticRHS;
447 syntactic = new (S.Context) BinaryOperator(syntacticLHS, capturedRHS,
448 opcode, capturedRHS->getType(),
449 capturedRHS->getValueKind(),
453 ExprResult opLHS = buildGet();
454 if (opLHS.isInvalid()) return ExprError();
456 // Build an ordinary, non-compound operation.
457 BinaryOperatorKind nonCompound =
458 BinaryOperator::getOpForCompoundAssignment(opcode);
459 result = S.BuildBinOp(Sc, opcLoc, nonCompound, opLHS.get(), semanticRHS);
460 if (result.isInvalid()) return ExprError();
463 new (S.Context) CompoundAssignOperator(syntacticLHS, capturedRHS, opcode,
464 result.get()->getType(),
465 result.get()->getValueKind(),
467 opLHS.get()->getType(),
468 result.get()->getType(),
469 opcLoc, FPOptions());
472 // The result of the assignment, if not void, is the value set into
474 result = buildSet(result.get(), opcLoc, captureSetValueAsResult());
475 if (result.isInvalid()) return ExprError();
476 addSemanticExpr(result.get());
477 if (!captureSetValueAsResult() && !result.get()->getType()->isVoidType() &&
478 (result.get()->isTypeDependent() || CanCaptureValue(result.get())))
479 setResultToLastSemantic();
481 return complete(syntactic);
484 /// The basic skeleton for building an increment or decrement
487 PseudoOpBuilder::buildIncDecOperation(Scope *Sc, SourceLocation opcLoc,
488 UnaryOperatorKind opcode,
490 assert(UnaryOperator::isIncrementDecrementOp(opcode));
492 Expr *syntacticOp = rebuildAndCaptureObject(op);
495 ExprResult result = buildGet();
496 if (result.isInvalid()) return ExprError();
498 QualType resultType = result.get()->getType();
500 // That's the postfix result.
501 if (UnaryOperator::isPostfix(opcode) &&
502 (result.get()->isTypeDependent() || CanCaptureValue(result.get()))) {
503 result = capture(result.get());
504 setResultToLastSemantic();
507 // Add or subtract a literal 1.
508 llvm::APInt oneV(S.Context.getTypeSize(S.Context.IntTy), 1);
509 Expr *one = IntegerLiteral::Create(S.Context, oneV, S.Context.IntTy,
512 if (UnaryOperator::isIncrementOp(opcode)) {
513 result = S.BuildBinOp(Sc, opcLoc, BO_Add, result.get(), one);
515 result = S.BuildBinOp(Sc, opcLoc, BO_Sub, result.get(), one);
517 if (result.isInvalid()) return ExprError();
519 // Store that back into the result. The value stored is the result
520 // of a prefix operation.
521 result = buildSet(result.get(), opcLoc, UnaryOperator::isPrefix(opcode) &&
522 captureSetValueAsResult());
523 if (result.isInvalid()) return ExprError();
524 addSemanticExpr(result.get());
525 if (UnaryOperator::isPrefix(opcode) && !captureSetValueAsResult() &&
526 !result.get()->getType()->isVoidType() &&
527 (result.get()->isTypeDependent() || CanCaptureValue(result.get())))
528 setResultToLastSemantic();
530 UnaryOperator *syntactic =
531 new (S.Context) UnaryOperator(syntacticOp, opcode, resultType,
532 VK_LValue, OK_Ordinary, opcLoc);
533 return complete(syntactic);
537 //===----------------------------------------------------------------------===//
538 // Objective-C @property and implicit property references
539 //===----------------------------------------------------------------------===//
541 /// Look up a method in the receiver type of an Objective-C property
543 static ObjCMethodDecl *LookupMethodInReceiverType(Sema &S, Selector sel,
544 const ObjCPropertyRefExpr *PRE) {
545 if (PRE->isObjectReceiver()) {
546 const ObjCObjectPointerType *PT =
547 PRE->getBase()->getType()->castAs<ObjCObjectPointerType>();
549 // Special case for 'self' in class method implementations.
550 if (PT->isObjCClassType() &&
551 S.isSelfExpr(const_cast<Expr*>(PRE->getBase()))) {
552 // This cast is safe because isSelfExpr is only true within
554 ObjCMethodDecl *method =
555 cast<ObjCMethodDecl>(S.CurContext->getNonClosureAncestor());
556 return S.LookupMethodInObjectType(sel,
557 S.Context.getObjCInterfaceType(method->getClassInterface()),
561 return S.LookupMethodInObjectType(sel, PT->getPointeeType(), true);
564 if (PRE->isSuperReceiver()) {
565 if (const ObjCObjectPointerType *PT =
566 PRE->getSuperReceiverType()->getAs<ObjCObjectPointerType>())
567 return S.LookupMethodInObjectType(sel, PT->getPointeeType(), true);
569 return S.LookupMethodInObjectType(sel, PRE->getSuperReceiverType(), false);
572 assert(PRE->isClassReceiver() && "Invalid expression");
573 QualType IT = S.Context.getObjCInterfaceType(PRE->getClassReceiver());
574 return S.LookupMethodInObjectType(sel, IT, false);
577 bool ObjCPropertyOpBuilder::isWeakProperty() const {
579 if (RefExpr->isExplicitProperty()) {
580 const ObjCPropertyDecl *Prop = RefExpr->getExplicitProperty();
581 if (Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak)
586 T = Getter->getReturnType();
591 return T.getObjCLifetime() == Qualifiers::OCL_Weak;
594 bool ObjCPropertyOpBuilder::findGetter() {
595 if (Getter) return true;
597 // For implicit properties, just trust the lookup we already did.
598 if (RefExpr->isImplicitProperty()) {
599 if ((Getter = RefExpr->getImplicitPropertyGetter())) {
600 GetterSelector = Getter->getSelector();
604 // Must build the getter selector the hard way.
605 ObjCMethodDecl *setter = RefExpr->getImplicitPropertySetter();
606 assert(setter && "both setter and getter are null - cannot happen");
607 IdentifierInfo *setterName =
608 setter->getSelector().getIdentifierInfoForSlot(0);
609 IdentifierInfo *getterName =
610 &S.Context.Idents.get(setterName->getName().substr(3));
612 S.PP.getSelectorTable().getNullarySelector(getterName);
617 ObjCPropertyDecl *prop = RefExpr->getExplicitProperty();
618 Getter = LookupMethodInReceiverType(S, prop->getGetterName(), RefExpr);
619 return (Getter != nullptr);
622 /// Try to find the most accurate setter declaration for the property
625 /// \return true if a setter was found, in which case Setter
626 bool ObjCPropertyOpBuilder::findSetter(bool warn) {
627 // For implicit properties, just trust the lookup we already did.
628 if (RefExpr->isImplicitProperty()) {
629 if (ObjCMethodDecl *setter = RefExpr->getImplicitPropertySetter()) {
631 SetterSelector = setter->getSelector();
634 IdentifierInfo *getterName =
635 RefExpr->getImplicitPropertyGetter()->getSelector()
636 .getIdentifierInfoForSlot(0);
638 SelectorTable::constructSetterSelector(S.PP.getIdentifierTable(),
639 S.PP.getSelectorTable(),
645 // For explicit properties, this is more involved.
646 ObjCPropertyDecl *prop = RefExpr->getExplicitProperty();
647 SetterSelector = prop->getSetterName();
649 // Do a normal method lookup first.
650 if (ObjCMethodDecl *setter =
651 LookupMethodInReceiverType(S, SetterSelector, RefExpr)) {
652 if (setter->isPropertyAccessor() && warn)
653 if (const ObjCInterfaceDecl *IFace =
654 dyn_cast<ObjCInterfaceDecl>(setter->getDeclContext())) {
655 StringRef thisPropertyName = prop->getName();
656 // Try flipping the case of the first character.
657 char front = thisPropertyName.front();
658 front = isLowercase(front) ? toUppercase(front) : toLowercase(front);
659 SmallString<100> PropertyName = thisPropertyName;
660 PropertyName[0] = front;
661 IdentifierInfo *AltMember = &S.PP.getIdentifierTable().get(PropertyName);
662 if (ObjCPropertyDecl *prop1 = IFace->FindPropertyDeclaration(
663 AltMember, prop->getQueryKind()))
664 if (prop != prop1 && (prop1->getSetterMethodDecl() == setter)) {
665 S.Diag(RefExpr->getExprLoc(), diag::err_property_setter_ambiguous_use)
666 << prop << prop1 << setter->getSelector();
667 S.Diag(prop->getLocation(), diag::note_property_declare);
668 S.Diag(prop1->getLocation(), diag::note_property_declare);
675 // That can fail in the somewhat crazy situation that we're
676 // type-checking a message send within the @interface declaration
677 // that declared the @property. But it's not clear that that's
678 // valuable to support.
683 void ObjCPropertyOpBuilder::DiagnoseUnsupportedPropertyUse() {
684 if (S.getCurLexicalContext()->isObjCContainer() &&
685 S.getCurLexicalContext()->getDeclKind() != Decl::ObjCCategoryImpl &&
686 S.getCurLexicalContext()->getDeclKind() != Decl::ObjCImplementation) {
687 if (ObjCPropertyDecl *prop = RefExpr->getExplicitProperty()) {
688 S.Diag(RefExpr->getLocation(),
689 diag::err_property_function_in_objc_container);
690 S.Diag(prop->getLocation(), diag::note_property_declare);
695 /// Capture the base object of an Objective-C property expression.
696 Expr *ObjCPropertyOpBuilder::rebuildAndCaptureObject(Expr *syntacticBase) {
697 assert(InstanceReceiver == nullptr);
699 // If we have a base, capture it in an OVE and rebuild the syntactic
700 // form to use the OVE as its base.
701 if (RefExpr->isObjectReceiver()) {
702 InstanceReceiver = capture(RefExpr->getBase());
703 syntacticBase = Rebuilder(S, [=](Expr *, unsigned) -> Expr * {
704 return InstanceReceiver;
705 }).rebuild(syntacticBase);
708 if (ObjCPropertyRefExpr *
709 refE = dyn_cast<ObjCPropertyRefExpr>(syntacticBase->IgnoreParens()))
710 SyntacticRefExpr = refE;
712 return syntacticBase;
715 /// Load from an Objective-C property reference.
716 ExprResult ObjCPropertyOpBuilder::buildGet() {
719 DiagnoseUnsupportedPropertyUse();
723 if (SyntacticRefExpr)
724 SyntacticRefExpr->setIsMessagingGetter();
726 QualType receiverType = RefExpr->getReceiverType(S.Context);
727 if (!Getter->isImplicit())
728 S.DiagnoseUseOfDecl(Getter, GenericLoc, nullptr, true);
729 // Build a message-send.
731 if ((Getter->isInstanceMethod() && !RefExpr->isClassReceiver()) ||
732 RefExpr->isObjectReceiver()) {
733 assert(InstanceReceiver || RefExpr->isSuperReceiver());
734 msg = S.BuildInstanceMessageImplicit(InstanceReceiver, receiverType,
735 GenericLoc, Getter->getSelector(),
738 msg = S.BuildClassMessageImplicit(receiverType, RefExpr->isSuperReceiver(),
739 GenericLoc, Getter->getSelector(),
745 /// Store to an Objective-C property reference.
747 /// \param captureSetValueAsResult If true, capture the actual
748 /// value being set as the value of the property operation.
749 ExprResult ObjCPropertyOpBuilder::buildSet(Expr *op, SourceLocation opcLoc,
750 bool captureSetValueAsResult) {
751 if (!findSetter(false)) {
752 DiagnoseUnsupportedPropertyUse();
756 if (SyntacticRefExpr)
757 SyntacticRefExpr->setIsMessagingSetter();
759 QualType receiverType = RefExpr->getReceiverType(S.Context);
761 // Use assignment constraints when possible; they give us better
762 // diagnostics. "When possible" basically means anything except a
764 if (!S.getLangOpts().CPlusPlus || !op->getType()->isRecordType()) {
765 QualType paramType = (*Setter->param_begin())->getType()
766 .substObjCMemberType(
768 Setter->getDeclContext(),
769 ObjCSubstitutionContext::Parameter);
770 if (!S.getLangOpts().CPlusPlus || !paramType->isRecordType()) {
771 ExprResult opResult = op;
772 Sema::AssignConvertType assignResult
773 = S.CheckSingleAssignmentConstraints(paramType, opResult);
774 if (opResult.isInvalid() ||
775 S.DiagnoseAssignmentResult(assignResult, opcLoc, paramType,
776 op->getType(), opResult.get(),
781 assert(op && "successful assignment left argument invalid?");
786 Expr *args[] = { op };
788 // Build a message-send.
790 if (!Setter->isImplicit())
791 S.DiagnoseUseOfDecl(Setter, GenericLoc, nullptr, true);
792 if ((Setter->isInstanceMethod() && !RefExpr->isClassReceiver()) ||
793 RefExpr->isObjectReceiver()) {
794 msg = S.BuildInstanceMessageImplicit(InstanceReceiver, receiverType,
795 GenericLoc, SetterSelector, Setter,
796 MultiExprArg(args, 1));
798 msg = S.BuildClassMessageImplicit(receiverType, RefExpr->isSuperReceiver(),
800 SetterSelector, Setter,
801 MultiExprArg(args, 1));
804 if (!msg.isInvalid() && captureSetValueAsResult) {
805 ObjCMessageExpr *msgExpr =
806 cast<ObjCMessageExpr>(msg.get()->IgnoreImplicit());
807 Expr *arg = msgExpr->getArg(0);
808 if (CanCaptureValue(arg))
809 msgExpr->setArg(0, captureValueAsResult(arg));
815 /// @property-specific behavior for doing lvalue-to-rvalue conversion.
816 ExprResult ObjCPropertyOpBuilder::buildRValueOperation(Expr *op) {
817 // Explicit properties always have getters, but implicit ones don't.
818 // Check that before proceeding.
819 if (RefExpr->isImplicitProperty() && !RefExpr->getImplicitPropertyGetter()) {
820 S.Diag(RefExpr->getLocation(), diag::err_getter_not_found)
821 << RefExpr->getSourceRange();
825 ExprResult result = PseudoOpBuilder::buildRValueOperation(op);
826 if (result.isInvalid()) return ExprError();
828 if (RefExpr->isExplicitProperty() && !Getter->hasRelatedResultType())
829 S.DiagnosePropertyAccessorMismatch(RefExpr->getExplicitProperty(),
830 Getter, RefExpr->getLocation());
832 // As a special case, if the method returns 'id', try to get
833 // a better type from the property.
834 if (RefExpr->isExplicitProperty() && result.get()->isRValue()) {
835 QualType receiverType = RefExpr->getReceiverType(S.Context);
836 QualType propType = RefExpr->getExplicitProperty()
837 ->getUsageType(receiverType);
838 if (result.get()->getType()->isObjCIdType()) {
839 if (const ObjCObjectPointerType *ptr
840 = propType->getAs<ObjCObjectPointerType>()) {
841 if (!ptr->isObjCIdType())
842 result = S.ImpCastExprToType(result.get(), propType, CK_BitCast);
845 if (propType.getObjCLifetime() == Qualifiers::OCL_Weak &&
846 !S.Diags.isIgnored(diag::warn_arc_repeated_use_of_weak,
847 RefExpr->getLocation()))
848 S.getCurFunction()->markSafeWeakUse(RefExpr);
854 /// Try to build this as a call to a getter that returns a reference.
856 /// \return true if it was possible, whether or not it actually
858 bool ObjCPropertyOpBuilder::tryBuildGetOfReference(Expr *op,
859 ExprResult &result) {
860 if (!S.getLangOpts().CPlusPlus) return false;
864 // The property has no setter and no getter! This can happen if the type is
865 // invalid. Error have already been reported.
866 result = ExprError();
870 // Only do this if the getter returns an l-value reference type.
871 QualType resultType = Getter->getReturnType();
872 if (!resultType->isLValueReferenceType()) return false;
874 result = buildRValueOperation(op);
878 /// @property-specific behavior for doing assignments.
880 ObjCPropertyOpBuilder::buildAssignmentOperation(Scope *Sc,
881 SourceLocation opcLoc,
882 BinaryOperatorKind opcode,
883 Expr *LHS, Expr *RHS) {
884 assert(BinaryOperator::isAssignmentOp(opcode));
886 // If there's no setter, we have no choice but to try to assign to
887 // the result of the getter.
890 if (tryBuildGetOfReference(LHS, result)) {
891 if (result.isInvalid()) return ExprError();
892 return S.BuildBinOp(Sc, opcLoc, opcode, result.get(), RHS);
895 // Otherwise, it's an error.
896 S.Diag(opcLoc, diag::err_nosetter_property_assignment)
897 << unsigned(RefExpr->isImplicitProperty())
899 << LHS->getSourceRange() << RHS->getSourceRange();
903 // If there is a setter, we definitely want to use it.
905 // Verify that we can do a compound assignment.
906 if (opcode != BO_Assign && !findGetter()) {
907 S.Diag(opcLoc, diag::err_nogetter_property_compound_assignment)
908 << LHS->getSourceRange() << RHS->getSourceRange();
913 PseudoOpBuilder::buildAssignmentOperation(Sc, opcLoc, opcode, LHS, RHS);
914 if (result.isInvalid()) return ExprError();
916 // Various warnings about property assignments in ARC.
917 if (S.getLangOpts().ObjCAutoRefCount && InstanceReceiver) {
918 S.checkRetainCycles(InstanceReceiver->getSourceExpr(), RHS);
919 S.checkUnsafeExprAssigns(opcLoc, LHS, RHS);
925 /// @property-specific behavior for doing increments and decrements.
927 ObjCPropertyOpBuilder::buildIncDecOperation(Scope *Sc, SourceLocation opcLoc,
928 UnaryOperatorKind opcode,
930 // If there's no setter, we have no choice but to try to assign to
931 // the result of the getter.
934 if (tryBuildGetOfReference(op, result)) {
935 if (result.isInvalid()) return ExprError();
936 return S.BuildUnaryOp(Sc, opcLoc, opcode, result.get());
939 // Otherwise, it's an error.
940 S.Diag(opcLoc, diag::err_nosetter_property_incdec)
941 << unsigned(RefExpr->isImplicitProperty())
942 << unsigned(UnaryOperator::isDecrementOp(opcode))
944 << op->getSourceRange();
948 // If there is a setter, we definitely want to use it.
950 // We also need a getter.
952 assert(RefExpr->isImplicitProperty());
953 S.Diag(opcLoc, diag::err_nogetter_property_incdec)
954 << unsigned(UnaryOperator::isDecrementOp(opcode))
956 << op->getSourceRange();
960 return PseudoOpBuilder::buildIncDecOperation(Sc, opcLoc, opcode, op);
963 ExprResult ObjCPropertyOpBuilder::complete(Expr *SyntacticForm) {
964 if (isWeakProperty() &&
965 !S.Diags.isIgnored(diag::warn_arc_repeated_use_of_weak,
966 SyntacticForm->getLocStart()))
967 S.recordUseOfEvaluatedWeak(SyntacticRefExpr,
968 SyntacticRefExpr->isMessagingGetter());
970 return PseudoOpBuilder::complete(SyntacticForm);
973 // ObjCSubscript build stuff.
976 /// objective-c subscripting-specific behavior for doing lvalue-to-rvalue
978 /// FIXME. Remove this routine if it is proven that no additional
979 /// specifity is needed.
980 ExprResult ObjCSubscriptOpBuilder::buildRValueOperation(Expr *op) {
981 ExprResult result = PseudoOpBuilder::buildRValueOperation(op);
982 if (result.isInvalid()) return ExprError();
986 /// objective-c subscripting-specific behavior for doing assignments.
988 ObjCSubscriptOpBuilder::buildAssignmentOperation(Scope *Sc,
989 SourceLocation opcLoc,
990 BinaryOperatorKind opcode,
991 Expr *LHS, Expr *RHS) {
992 assert(BinaryOperator::isAssignmentOp(opcode));
993 // There must be a method to do the Index'ed assignment.
994 if (!findAtIndexSetter())
997 // Verify that we can do a compound assignment.
998 if (opcode != BO_Assign && !findAtIndexGetter())
1002 PseudoOpBuilder::buildAssignmentOperation(Sc, opcLoc, opcode, LHS, RHS);
1003 if (result.isInvalid()) return ExprError();
1005 // Various warnings about objc Index'ed assignments in ARC.
1006 if (S.getLangOpts().ObjCAutoRefCount && InstanceBase) {
1007 S.checkRetainCycles(InstanceBase->getSourceExpr(), RHS);
1008 S.checkUnsafeExprAssigns(opcLoc, LHS, RHS);
1014 /// Capture the base object of an Objective-C Index'ed expression.
1015 Expr *ObjCSubscriptOpBuilder::rebuildAndCaptureObject(Expr *syntacticBase) {
1016 assert(InstanceBase == nullptr);
1018 // Capture base expression in an OVE and rebuild the syntactic
1019 // form to use the OVE as its base expression.
1020 InstanceBase = capture(RefExpr->getBaseExpr());
1021 InstanceKey = capture(RefExpr->getKeyExpr());
1024 Rebuilder(S, [=](Expr *, unsigned Idx) -> Expr * {
1027 return InstanceBase;
1031 llvm_unreachable("Unexpected index for ObjCSubscriptExpr");
1033 }).rebuild(syntacticBase);
1035 return syntacticBase;
1038 /// CheckSubscriptingKind - This routine decide what type
1039 /// of indexing represented by "FromE" is being done.
1040 Sema::ObjCSubscriptKind
1041 Sema::CheckSubscriptingKind(Expr *FromE) {
1042 // If the expression already has integral or enumeration type, we're golden.
1043 QualType T = FromE->getType();
1044 if (T->isIntegralOrEnumerationType())
1047 // If we don't have a class type in C++, there's no way we can get an
1048 // expression of integral or enumeration type.
1049 const RecordType *RecordTy = T->getAs<RecordType>();
1051 (T->isObjCObjectPointerType() || T->isVoidPointerType()))
1052 // All other scalar cases are assumed to be dictionary indexing which
1053 // caller handles, with diagnostics if needed.
1054 return OS_Dictionary;
1055 if (!getLangOpts().CPlusPlus ||
1056 !RecordTy || RecordTy->isIncompleteType()) {
1057 // No indexing can be done. Issue diagnostics and quit.
1058 const Expr *IndexExpr = FromE->IgnoreParenImpCasts();
1059 if (isa<StringLiteral>(IndexExpr))
1060 Diag(FromE->getExprLoc(), diag::err_objc_subscript_pointer)
1061 << T << FixItHint::CreateInsertion(FromE->getExprLoc(), "@");
1063 Diag(FromE->getExprLoc(), diag::err_objc_subscript_type_conversion)
1068 // We must have a complete class type.
1069 if (RequireCompleteType(FromE->getExprLoc(), T,
1070 diag::err_objc_index_incomplete_class_type, FromE))
1073 // Look for a conversion to an integral, enumeration type, or
1074 // objective-C pointer type.
1075 int NoIntegrals=0, NoObjCIdPointers=0;
1076 SmallVector<CXXConversionDecl *, 4> ConversionDecls;
1078 for (NamedDecl *D : cast<CXXRecordDecl>(RecordTy->getDecl())
1079 ->getVisibleConversionFunctions()) {
1080 if (CXXConversionDecl *Conversion =
1081 dyn_cast<CXXConversionDecl>(D->getUnderlyingDecl())) {
1082 QualType CT = Conversion->getConversionType().getNonReferenceType();
1083 if (CT->isIntegralOrEnumerationType()) {
1085 ConversionDecls.push_back(Conversion);
1087 else if (CT->isObjCIdType() ||CT->isBlockPointerType()) {
1089 ConversionDecls.push_back(Conversion);
1093 if (NoIntegrals ==1 && NoObjCIdPointers == 0)
1095 if (NoIntegrals == 0 && NoObjCIdPointers == 1)
1096 return OS_Dictionary;
1097 if (NoIntegrals == 0 && NoObjCIdPointers == 0) {
1098 // No conversion function was found. Issue diagnostic and return.
1099 Diag(FromE->getExprLoc(), diag::err_objc_subscript_type_conversion)
1100 << FromE->getType();
1103 Diag(FromE->getExprLoc(), diag::err_objc_multiple_subscript_type_conversion)
1104 << FromE->getType();
1105 for (unsigned int i = 0; i < ConversionDecls.size(); i++)
1106 Diag(ConversionDecls[i]->getLocation(),
1107 diag::note_conv_function_declared_at);
1112 /// CheckKeyForObjCARCConversion - This routine suggests bridge casting of CF
1113 /// objects used as dictionary subscript key objects.
1114 static void CheckKeyForObjCARCConversion(Sema &S, QualType ContainerT,
1116 if (ContainerT.isNull())
1118 // dictionary subscripting.
1119 // - (id)objectForKeyedSubscript:(id)key;
1120 IdentifierInfo *KeyIdents[] = {
1121 &S.Context.Idents.get("objectForKeyedSubscript")
1123 Selector GetterSelector = S.Context.Selectors.getSelector(1, KeyIdents);
1124 ObjCMethodDecl *Getter = S.LookupMethodInObjectType(GetterSelector, ContainerT,
1128 QualType T = Getter->parameters()[0]->getType();
1129 S.CheckObjCConversion(Key->getSourceRange(), T, Key,
1130 Sema::CCK_ImplicitConversion);
1133 bool ObjCSubscriptOpBuilder::findAtIndexGetter() {
1137 Expr *BaseExpr = RefExpr->getBaseExpr();
1138 QualType BaseT = BaseExpr->getType();
1140 QualType ResultType;
1141 if (const ObjCObjectPointerType *PTy =
1142 BaseT->getAs<ObjCObjectPointerType>()) {
1143 ResultType = PTy->getPointeeType();
1145 Sema::ObjCSubscriptKind Res =
1146 S.CheckSubscriptingKind(RefExpr->getKeyExpr());
1147 if (Res == Sema::OS_Error) {
1148 if (S.getLangOpts().ObjCAutoRefCount)
1149 CheckKeyForObjCARCConversion(S, ResultType,
1150 RefExpr->getKeyExpr());
1153 bool arrayRef = (Res == Sema::OS_Array);
1155 if (ResultType.isNull()) {
1156 S.Diag(BaseExpr->getExprLoc(), diag::err_objc_subscript_base_type)
1157 << BaseExpr->getType() << arrayRef;
1161 // dictionary subscripting.
1162 // - (id)objectForKeyedSubscript:(id)key;
1163 IdentifierInfo *KeyIdents[] = {
1164 &S.Context.Idents.get("objectForKeyedSubscript")
1166 AtIndexGetterSelector = S.Context.Selectors.getSelector(1, KeyIdents);
1169 // - (id)objectAtIndexedSubscript:(size_t)index;
1170 IdentifierInfo *KeyIdents[] = {
1171 &S.Context.Idents.get("objectAtIndexedSubscript")
1174 AtIndexGetterSelector = S.Context.Selectors.getSelector(1, KeyIdents);
1177 AtIndexGetter = S.LookupMethodInObjectType(AtIndexGetterSelector, ResultType,
1180 if (!AtIndexGetter && S.getLangOpts().DebuggerObjCLiteral) {
1181 AtIndexGetter = ObjCMethodDecl::Create(S.Context, SourceLocation(),
1182 SourceLocation(), AtIndexGetterSelector,
1183 S.Context.getObjCIdType() /*ReturnType*/,
1184 nullptr /*TypeSourceInfo */,
1185 S.Context.getTranslationUnitDecl(),
1186 true /*Instance*/, false/*isVariadic*/,
1187 /*isPropertyAccessor=*/false,
1188 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
1189 ObjCMethodDecl::Required,
1191 ParmVarDecl *Argument = ParmVarDecl::Create(S.Context, AtIndexGetter,
1192 SourceLocation(), SourceLocation(),
1193 arrayRef ? &S.Context.Idents.get("index")
1194 : &S.Context.Idents.get("key"),
1195 arrayRef ? S.Context.UnsignedLongTy
1196 : S.Context.getObjCIdType(),
1200 AtIndexGetter->setMethodParams(S.Context, Argument, None);
1203 if (!AtIndexGetter) {
1204 if (!BaseT->isObjCIdType()) {
1205 S.Diag(BaseExpr->getExprLoc(), diag::err_objc_subscript_method_not_found)
1206 << BaseExpr->getType() << 0 << arrayRef;
1210 S.LookupInstanceMethodInGlobalPool(AtIndexGetterSelector,
1211 RefExpr->getSourceRange(),
1215 if (AtIndexGetter) {
1216 QualType T = AtIndexGetter->parameters()[0]->getType();
1217 if ((arrayRef && !T->isIntegralOrEnumerationType()) ||
1218 (!arrayRef && !T->isObjCObjectPointerType())) {
1219 S.Diag(RefExpr->getKeyExpr()->getExprLoc(),
1220 arrayRef ? diag::err_objc_subscript_index_type
1221 : diag::err_objc_subscript_key_type) << T;
1222 S.Diag(AtIndexGetter->parameters()[0]->getLocation(),
1223 diag::note_parameter_type) << T;
1226 QualType R = AtIndexGetter->getReturnType();
1227 if (!R->isObjCObjectPointerType()) {
1228 S.Diag(RefExpr->getKeyExpr()->getExprLoc(),
1229 diag::err_objc_indexing_method_result_type) << R << arrayRef;
1230 S.Diag(AtIndexGetter->getLocation(), diag::note_method_declared_at) <<
1231 AtIndexGetter->getDeclName();
1237 bool ObjCSubscriptOpBuilder::findAtIndexSetter() {
1241 Expr *BaseExpr = RefExpr->getBaseExpr();
1242 QualType BaseT = BaseExpr->getType();
1244 QualType ResultType;
1245 if (const ObjCObjectPointerType *PTy =
1246 BaseT->getAs<ObjCObjectPointerType>()) {
1247 ResultType = PTy->getPointeeType();
1250 Sema::ObjCSubscriptKind Res =
1251 S.CheckSubscriptingKind(RefExpr->getKeyExpr());
1252 if (Res == Sema::OS_Error) {
1253 if (S.getLangOpts().ObjCAutoRefCount)
1254 CheckKeyForObjCARCConversion(S, ResultType,
1255 RefExpr->getKeyExpr());
1258 bool arrayRef = (Res == Sema::OS_Array);
1260 if (ResultType.isNull()) {
1261 S.Diag(BaseExpr->getExprLoc(), diag::err_objc_subscript_base_type)
1262 << BaseExpr->getType() << arrayRef;
1267 // dictionary subscripting.
1268 // - (void)setObject:(id)object forKeyedSubscript:(id)key;
1269 IdentifierInfo *KeyIdents[] = {
1270 &S.Context.Idents.get("setObject"),
1271 &S.Context.Idents.get("forKeyedSubscript")
1273 AtIndexSetterSelector = S.Context.Selectors.getSelector(2, KeyIdents);
1276 // - (void)setObject:(id)object atIndexedSubscript:(NSInteger)index;
1277 IdentifierInfo *KeyIdents[] = {
1278 &S.Context.Idents.get("setObject"),
1279 &S.Context.Idents.get("atIndexedSubscript")
1281 AtIndexSetterSelector = S.Context.Selectors.getSelector(2, KeyIdents);
1283 AtIndexSetter = S.LookupMethodInObjectType(AtIndexSetterSelector, ResultType,
1286 if (!AtIndexSetter && S.getLangOpts().DebuggerObjCLiteral) {
1287 TypeSourceInfo *ReturnTInfo = nullptr;
1288 QualType ReturnType = S.Context.VoidTy;
1289 AtIndexSetter = ObjCMethodDecl::Create(
1290 S.Context, SourceLocation(), SourceLocation(), AtIndexSetterSelector,
1291 ReturnType, ReturnTInfo, S.Context.getTranslationUnitDecl(),
1292 true /*Instance*/, false /*isVariadic*/,
1293 /*isPropertyAccessor=*/false,
1294 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
1295 ObjCMethodDecl::Required, false);
1296 SmallVector<ParmVarDecl *, 2> Params;
1297 ParmVarDecl *object = ParmVarDecl::Create(S.Context, AtIndexSetter,
1298 SourceLocation(), SourceLocation(),
1299 &S.Context.Idents.get("object"),
1300 S.Context.getObjCIdType(),
1304 Params.push_back(object);
1305 ParmVarDecl *key = ParmVarDecl::Create(S.Context, AtIndexSetter,
1306 SourceLocation(), SourceLocation(),
1307 arrayRef ? &S.Context.Idents.get("index")
1308 : &S.Context.Idents.get("key"),
1309 arrayRef ? S.Context.UnsignedLongTy
1310 : S.Context.getObjCIdType(),
1314 Params.push_back(key);
1315 AtIndexSetter->setMethodParams(S.Context, Params, None);
1318 if (!AtIndexSetter) {
1319 if (!BaseT->isObjCIdType()) {
1320 S.Diag(BaseExpr->getExprLoc(),
1321 diag::err_objc_subscript_method_not_found)
1322 << BaseExpr->getType() << 1 << arrayRef;
1326 S.LookupInstanceMethodInGlobalPool(AtIndexSetterSelector,
1327 RefExpr->getSourceRange(),
1332 if (AtIndexSetter && arrayRef) {
1333 QualType T = AtIndexSetter->parameters()[1]->getType();
1334 if (!T->isIntegralOrEnumerationType()) {
1335 S.Diag(RefExpr->getKeyExpr()->getExprLoc(),
1336 diag::err_objc_subscript_index_type) << T;
1337 S.Diag(AtIndexSetter->parameters()[1]->getLocation(),
1338 diag::note_parameter_type) << T;
1341 T = AtIndexSetter->parameters()[0]->getType();
1342 if (!T->isObjCObjectPointerType()) {
1343 S.Diag(RefExpr->getBaseExpr()->getExprLoc(),
1344 diag::err_objc_subscript_object_type) << T << arrayRef;
1345 S.Diag(AtIndexSetter->parameters()[0]->getLocation(),
1346 diag::note_parameter_type) << T;
1350 else if (AtIndexSetter && !arrayRef)
1351 for (unsigned i=0; i <2; i++) {
1352 QualType T = AtIndexSetter->parameters()[i]->getType();
1353 if (!T->isObjCObjectPointerType()) {
1355 S.Diag(RefExpr->getKeyExpr()->getExprLoc(),
1356 diag::err_objc_subscript_key_type) << T;
1358 S.Diag(RefExpr->getBaseExpr()->getExprLoc(),
1359 diag::err_objc_subscript_dic_object_type) << T;
1360 S.Diag(AtIndexSetter->parameters()[i]->getLocation(),
1361 diag::note_parameter_type) << T;
1369 // Get the object at "Index" position in the container.
1370 // [BaseExpr objectAtIndexedSubscript : IndexExpr];
1371 ExprResult ObjCSubscriptOpBuilder::buildGet() {
1372 if (!findAtIndexGetter())
1375 QualType receiverType = InstanceBase->getType();
1377 // Build a message-send.
1379 Expr *Index = InstanceKey;
1382 Expr *args[] = { Index };
1383 assert(InstanceBase);
1385 S.DiagnoseUseOfDecl(AtIndexGetter, GenericLoc);
1386 msg = S.BuildInstanceMessageImplicit(InstanceBase, receiverType,
1388 AtIndexGetterSelector, AtIndexGetter,
1389 MultiExprArg(args, 1));
1393 /// Store into the container the "op" object at "Index"'ed location
1394 /// by building this messaging expression:
1395 /// - (void)setObject:(id)object atIndexedSubscript:(NSInteger)index;
1396 /// \param captureSetValueAsResult If true, capture the actual
1397 /// value being set as the value of the property operation.
1398 ExprResult ObjCSubscriptOpBuilder::buildSet(Expr *op, SourceLocation opcLoc,
1399 bool captureSetValueAsResult) {
1400 if (!findAtIndexSetter())
1403 S.DiagnoseUseOfDecl(AtIndexSetter, GenericLoc);
1404 QualType receiverType = InstanceBase->getType();
1405 Expr *Index = InstanceKey;
1408 Expr *args[] = { op, Index };
1410 // Build a message-send.
1411 ExprResult msg = S.BuildInstanceMessageImplicit(InstanceBase, receiverType,
1413 AtIndexSetterSelector,
1415 MultiExprArg(args, 2));
1417 if (!msg.isInvalid() && captureSetValueAsResult) {
1418 ObjCMessageExpr *msgExpr =
1419 cast<ObjCMessageExpr>(msg.get()->IgnoreImplicit());
1420 Expr *arg = msgExpr->getArg(0);
1421 if (CanCaptureValue(arg))
1422 msgExpr->setArg(0, captureValueAsResult(arg));
1428 //===----------------------------------------------------------------------===//
1429 // MSVC __declspec(property) references
1430 //===----------------------------------------------------------------------===//
1433 MSPropertyOpBuilder::getBaseMSProperty(MSPropertySubscriptExpr *E) {
1434 CallArgs.insert(CallArgs.begin(), E->getIdx());
1435 Expr *Base = E->getBase()->IgnoreParens();
1436 while (auto *MSPropSubscript = dyn_cast<MSPropertySubscriptExpr>(Base)) {
1437 CallArgs.insert(CallArgs.begin(), MSPropSubscript->getIdx());
1438 Base = MSPropSubscript->getBase()->IgnoreParens();
1440 return cast<MSPropertyRefExpr>(Base);
1443 Expr *MSPropertyOpBuilder::rebuildAndCaptureObject(Expr *syntacticBase) {
1444 InstanceBase = capture(RefExpr->getBaseExpr());
1445 std::for_each(CallArgs.begin(), CallArgs.end(),
1446 [this](Expr *&Arg) { Arg = capture(Arg); });
1447 syntacticBase = Rebuilder(S, [=](Expr *, unsigned Idx) -> Expr * {
1450 return InstanceBase;
1452 assert(Idx <= CallArgs.size());
1453 return CallArgs[Idx - 1];
1455 }).rebuild(syntacticBase);
1457 return syntacticBase;
1460 ExprResult MSPropertyOpBuilder::buildGet() {
1461 if (!RefExpr->getPropertyDecl()->hasGetter()) {
1462 S.Diag(RefExpr->getMemberLoc(), diag::err_no_accessor_for_property)
1463 << 0 /* getter */ << RefExpr->getPropertyDecl();
1467 UnqualifiedId GetterName;
1468 IdentifierInfo *II = RefExpr->getPropertyDecl()->getGetterId();
1469 GetterName.setIdentifier(II, RefExpr->getMemberLoc());
1471 SS.Adopt(RefExpr->getQualifierLoc());
1472 ExprResult GetterExpr =
1473 S.ActOnMemberAccessExpr(S.getCurScope(), InstanceBase, SourceLocation(),
1474 RefExpr->isArrow() ? tok::arrow : tok::period, SS,
1475 SourceLocation(), GetterName, nullptr);
1476 if (GetterExpr.isInvalid()) {
1477 S.Diag(RefExpr->getMemberLoc(),
1478 diag::err_cannot_find_suitable_accessor) << 0 /* getter */
1479 << RefExpr->getPropertyDecl();
1483 return S.ActOnCallExpr(S.getCurScope(), GetterExpr.get(),
1484 RefExpr->getSourceRange().getBegin(), CallArgs,
1485 RefExpr->getSourceRange().getEnd());
1488 ExprResult MSPropertyOpBuilder::buildSet(Expr *op, SourceLocation sl,
1489 bool captureSetValueAsResult) {
1490 if (!RefExpr->getPropertyDecl()->hasSetter()) {
1491 S.Diag(RefExpr->getMemberLoc(), diag::err_no_accessor_for_property)
1492 << 1 /* setter */ << RefExpr->getPropertyDecl();
1496 UnqualifiedId SetterName;
1497 IdentifierInfo *II = RefExpr->getPropertyDecl()->getSetterId();
1498 SetterName.setIdentifier(II, RefExpr->getMemberLoc());
1500 SS.Adopt(RefExpr->getQualifierLoc());
1501 ExprResult SetterExpr =
1502 S.ActOnMemberAccessExpr(S.getCurScope(), InstanceBase, SourceLocation(),
1503 RefExpr->isArrow() ? tok::arrow : tok::period, SS,
1504 SourceLocation(), SetterName, nullptr);
1505 if (SetterExpr.isInvalid()) {
1506 S.Diag(RefExpr->getMemberLoc(),
1507 diag::err_cannot_find_suitable_accessor) << 1 /* setter */
1508 << RefExpr->getPropertyDecl();
1512 SmallVector<Expr*, 4> ArgExprs;
1513 ArgExprs.append(CallArgs.begin(), CallArgs.end());
1514 ArgExprs.push_back(op);
1515 return S.ActOnCallExpr(S.getCurScope(), SetterExpr.get(),
1516 RefExpr->getSourceRange().getBegin(), ArgExprs,
1517 op->getSourceRange().getEnd());
1520 //===----------------------------------------------------------------------===//
1521 // General Sema routines.
1522 //===----------------------------------------------------------------------===//
1524 ExprResult Sema::checkPseudoObjectRValue(Expr *E) {
1525 Expr *opaqueRef = E->IgnoreParens();
1526 if (ObjCPropertyRefExpr *refExpr
1527 = dyn_cast<ObjCPropertyRefExpr>(opaqueRef)) {
1528 ObjCPropertyOpBuilder builder(*this, refExpr);
1529 return builder.buildRValueOperation(E);
1531 else if (ObjCSubscriptRefExpr *refExpr
1532 = dyn_cast<ObjCSubscriptRefExpr>(opaqueRef)) {
1533 ObjCSubscriptOpBuilder builder(*this, refExpr);
1534 return builder.buildRValueOperation(E);
1535 } else if (MSPropertyRefExpr *refExpr
1536 = dyn_cast<MSPropertyRefExpr>(opaqueRef)) {
1537 MSPropertyOpBuilder builder(*this, refExpr);
1538 return builder.buildRValueOperation(E);
1539 } else if (MSPropertySubscriptExpr *RefExpr =
1540 dyn_cast<MSPropertySubscriptExpr>(opaqueRef)) {
1541 MSPropertyOpBuilder Builder(*this, RefExpr);
1542 return Builder.buildRValueOperation(E);
1544 llvm_unreachable("unknown pseudo-object kind!");
1548 /// Check an increment or decrement of a pseudo-object expression.
1549 ExprResult Sema::checkPseudoObjectIncDec(Scope *Sc, SourceLocation opcLoc,
1550 UnaryOperatorKind opcode, Expr *op) {
1551 // Do nothing if the operand is dependent.
1552 if (op->isTypeDependent())
1553 return new (Context) UnaryOperator(op, opcode, Context.DependentTy,
1554 VK_RValue, OK_Ordinary, opcLoc);
1556 assert(UnaryOperator::isIncrementDecrementOp(opcode));
1557 Expr *opaqueRef = op->IgnoreParens();
1558 if (ObjCPropertyRefExpr *refExpr
1559 = dyn_cast<ObjCPropertyRefExpr>(opaqueRef)) {
1560 ObjCPropertyOpBuilder builder(*this, refExpr);
1561 return builder.buildIncDecOperation(Sc, opcLoc, opcode, op);
1562 } else if (isa<ObjCSubscriptRefExpr>(opaqueRef)) {
1563 Diag(opcLoc, diag::err_illegal_container_subscripting_op);
1565 } else if (MSPropertyRefExpr *refExpr
1566 = dyn_cast<MSPropertyRefExpr>(opaqueRef)) {
1567 MSPropertyOpBuilder builder(*this, refExpr);
1568 return builder.buildIncDecOperation(Sc, opcLoc, opcode, op);
1569 } else if (MSPropertySubscriptExpr *RefExpr
1570 = dyn_cast<MSPropertySubscriptExpr>(opaqueRef)) {
1571 MSPropertyOpBuilder Builder(*this, RefExpr);
1572 return Builder.buildIncDecOperation(Sc, opcLoc, opcode, op);
1574 llvm_unreachable("unknown pseudo-object kind!");
1578 ExprResult Sema::checkPseudoObjectAssignment(Scope *S, SourceLocation opcLoc,
1579 BinaryOperatorKind opcode,
1580 Expr *LHS, Expr *RHS) {
1581 // Do nothing if either argument is dependent.
1582 if (LHS->isTypeDependent() || RHS->isTypeDependent())
1583 return new (Context) BinaryOperator(LHS, RHS, opcode, Context.DependentTy,
1584 VK_RValue, OK_Ordinary, opcLoc,
1587 // Filter out non-overload placeholder types in the RHS.
1588 if (RHS->getType()->isNonOverloadPlaceholderType()) {
1589 ExprResult result = CheckPlaceholderExpr(RHS);
1590 if (result.isInvalid()) return ExprError();
1594 Expr *opaqueRef = LHS->IgnoreParens();
1595 if (ObjCPropertyRefExpr *refExpr
1596 = dyn_cast<ObjCPropertyRefExpr>(opaqueRef)) {
1597 ObjCPropertyOpBuilder builder(*this, refExpr);
1598 return builder.buildAssignmentOperation(S, opcLoc, opcode, LHS, RHS);
1599 } else if (ObjCSubscriptRefExpr *refExpr
1600 = dyn_cast<ObjCSubscriptRefExpr>(opaqueRef)) {
1601 ObjCSubscriptOpBuilder builder(*this, refExpr);
1602 return builder.buildAssignmentOperation(S, opcLoc, opcode, LHS, RHS);
1603 } else if (MSPropertyRefExpr *refExpr
1604 = dyn_cast<MSPropertyRefExpr>(opaqueRef)) {
1605 MSPropertyOpBuilder builder(*this, refExpr);
1606 return builder.buildAssignmentOperation(S, opcLoc, opcode, LHS, RHS);
1607 } else if (MSPropertySubscriptExpr *RefExpr
1608 = dyn_cast<MSPropertySubscriptExpr>(opaqueRef)) {
1609 MSPropertyOpBuilder Builder(*this, RefExpr);
1610 return Builder.buildAssignmentOperation(S, opcLoc, opcode, LHS, RHS);
1612 llvm_unreachable("unknown pseudo-object kind!");
1616 /// Given a pseudo-object reference, rebuild it without the opaque
1617 /// values. Basically, undo the behavior of rebuildAndCaptureObject.
1618 /// This should never operate in-place.
1619 static Expr *stripOpaqueValuesFromPseudoObjectRef(Sema &S, Expr *E) {
1621 [=](Expr *E, unsigned) -> Expr * {
1622 return cast<OpaqueValueExpr>(E)->getSourceExpr();
1627 /// Given a pseudo-object expression, recreate what it looks like
1628 /// syntactically without the attendant OpaqueValueExprs.
1630 /// This is a hack which should be removed when TreeTransform is
1631 /// capable of rebuilding a tree without stripping implicit
1633 Expr *Sema::recreateSyntacticForm(PseudoObjectExpr *E) {
1634 Expr *syntax = E->getSyntacticForm();
1635 if (UnaryOperator *uop = dyn_cast<UnaryOperator>(syntax)) {
1636 Expr *op = stripOpaqueValuesFromPseudoObjectRef(*this, uop->getSubExpr());
1637 return new (Context) UnaryOperator(op, uop->getOpcode(), uop->getType(),
1638 uop->getValueKind(), uop->getObjectKind(),
1639 uop->getOperatorLoc());
1640 } else if (CompoundAssignOperator *cop
1641 = dyn_cast<CompoundAssignOperator>(syntax)) {
1642 Expr *lhs = stripOpaqueValuesFromPseudoObjectRef(*this, cop->getLHS());
1643 Expr *rhs = cast<OpaqueValueExpr>(cop->getRHS())->getSourceExpr();
1644 return new (Context) CompoundAssignOperator(lhs, rhs, cop->getOpcode(),
1646 cop->getValueKind(),
1647 cop->getObjectKind(),
1648 cop->getComputationLHSType(),
1649 cop->getComputationResultType(),
1650 cop->getOperatorLoc(),
1652 } else if (BinaryOperator *bop = dyn_cast<BinaryOperator>(syntax)) {
1653 Expr *lhs = stripOpaqueValuesFromPseudoObjectRef(*this, bop->getLHS());
1654 Expr *rhs = cast<OpaqueValueExpr>(bop->getRHS())->getSourceExpr();
1655 return new (Context) BinaryOperator(lhs, rhs, bop->getOpcode(),
1656 bop->getType(), bop->getValueKind(),
1657 bop->getObjectKind(),
1658 bop->getOperatorLoc(), FPOptions());
1660 assert(syntax->hasPlaceholderType(BuiltinType::PseudoObject));
1661 return stripOpaqueValuesFromPseudoObjectRef(*this, syntax);