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SemaPseudoObject.cpp
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1 //===--- SemaPseudoObject.cpp - Semantic Analysis for Pseudo-Objects ------===//
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 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.
14 //
15 // For example, Objective-C objects can have "properties", either
16 // declared or undeclared. A property may be accessed by writing
17 // expr.prop
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:
22 // [expr prop]
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]
30 //
31 //===----------------------------------------------------------------------===//
32 
34 #include "clang/AST/ExprCXX.h"
35 #include "clang/AST/ExprObjC.h"
36 #include "clang/Basic/CharInfo.h"
37 #include "clang/Lex/Preprocessor.h"
39 #include "clang/Sema/ScopeInfo.h"
40 #include "llvm/ADT/SmallString.h"
41 
42 using namespace clang;
43 using namespace sema;
44 
45 namespace {
46  // Basically just a very focused copy of TreeTransform.
47  struct Rebuilder {
48  Sema &S;
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) {}
55 
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())
60  return refExpr;
61 
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));
67  }
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));
73  }
74  Expr *rebuildObjCSubscriptRefExpr(ObjCSubscriptRefExpr *refExpr) {
75  assert(refExpr->getBaseExpr());
76  assert(refExpr->getKeyExpr());
77 
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());
84  }
85  Expr *rebuildMSPropertyRefExpr(MSPropertyRefExpr *refExpr) {
86  assert(refExpr->getBaseExpr());
87 
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());
93  }
94  Expr *rebuildMSPropertySubscriptExpr(MSPropertySubscriptExpr *refExpr) {
95  assert(refExpr->getBase());
96  assert(refExpr->getIdx());
97 
98  auto *NewBase = rebuild(refExpr->getBase());
99  ++MSPropertySubscriptCount;
100  return new (S.Context) MSPropertySubscriptExpr(
101  NewBase,
102  SpecificCallback(refExpr->getIdx(), MSPropertySubscriptCount),
103  refExpr->getType(), refExpr->getValueKind(), refExpr->getObjectKind(),
104  refExpr->getRBracketLoc());
105  }
106 
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);
117 
118  // Otherwise, we should look through and rebuild anything that
119  // IgnoreParens would.
120 
121  if (ParenExpr *parens = dyn_cast<ParenExpr>(e)) {
122  e = rebuild(parens->getSubExpr());
123  return new (S.Context) ParenExpr(parens->getLParen(),
124  parens->getRParen(),
125  e);
126  }
127 
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(),
132  uop->getType(),
133  uop->getValueKind(),
134  uop->getObjectKind(),
135  uop->getOperatorLoc());
136  }
137 
138  if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
139  assert(!gse->isResultDependent());
140  unsigned resultIndex = gse->getResultIndex();
141  unsigned numAssocs = gse->getNumAssocs();
142 
143  SmallVector<Expr*, 8> assocs(numAssocs);
144  SmallVector<TypeSourceInfo*, 8> assocTypes(numAssocs);
145 
146  for (unsigned i = 0; i != numAssocs; ++i) {
147  Expr *assoc = gse->getAssocExpr(i);
148  if (i == resultIndex) assoc = rebuild(assoc);
149  assocs[i] = assoc;
150  assocTypes[i] = gse->getAssocTypeSourceInfo(i);
151  }
152 
153  return new (S.Context) GenericSelectionExpr(S.Context,
154  gse->getGenericLoc(),
155  gse->getControllingExpr(),
156  assocTypes,
157  assocs,
158  gse->getDefaultLoc(),
159  gse->getRParenLoc(),
160  gse->containsUnexpandedParameterPack(),
161  resultIndex);
162  }
163 
164  if (ChooseExpr *ce = dyn_cast<ChooseExpr>(e)) {
165  assert(!ce->isConditionDependent());
166 
167  Expr *LHS = ce->getLHS(), *RHS = ce->getRHS();
168  Expr *&rebuiltExpr = ce->isConditionTrue() ? LHS : RHS;
169  rebuiltExpr = rebuild(rebuiltExpr);
170 
171  return new (S.Context) ChooseExpr(ce->getBuiltinLoc(),
172  ce->getCond(),
173  LHS, RHS,
174  rebuiltExpr->getType(),
175  rebuiltExpr->getValueKind(),
176  rebuiltExpr->getObjectKind(),
177  ce->getRParenLoc(),
178  ce->isConditionTrue(),
179  rebuiltExpr->isTypeDependent(),
180  rebuiltExpr->isValueDependent());
181  }
182 
183  llvm_unreachable("bad expression to rebuild!");
184  }
185  };
186 
187  class PseudoOpBuilder {
188  public:
189  Sema &S;
190  unsigned ResultIndex;
191  SourceLocation GenericLoc;
192  SmallVector<Expr *, 4> Semantics;
193 
194  PseudoOpBuilder(Sema &S, SourceLocation genericLoc)
195  : S(S), ResultIndex(PseudoObjectExpr::NoResult),
196  GenericLoc(genericLoc) {}
197 
198  virtual ~PseudoOpBuilder() {}
199 
200  /// Add a normal semantic expression.
201  void addSemanticExpr(Expr *semantic) {
202  Semantics.push_back(semantic);
203  }
204 
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);
210  }
211 
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,
219  Expr *op);
220 
221  virtual ExprResult complete(Expr *syntacticForm);
222 
223  OpaqueValueExpr *capture(Expr *op);
224  OpaqueValueExpr *captureValueAsResult(Expr *op);
225 
226  void setResultToLastSemantic() {
227  assert(ResultIndex == PseudoObjectExpr::NoResult);
228  ResultIndex = Semantics.size() - 1;
229  }
230 
231  /// Return true if assignments have a non-void result.
232  static bool CanCaptureValue(Expr *exp) {
233  if (exp->isGLValue())
234  return true;
235  QualType ty = exp->getType();
236  assert(!ty->isIncompleteType());
237  assert(!ty->isDependentType());
238 
239  if (const CXXRecordDecl *ClassDecl = ty->getAsCXXRecordDecl())
240  return ClassDecl->isTriviallyCopyable();
241  return true;
242  }
243 
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?
250  ///
251  /// Different pseudo-object language features use different language rules
252  /// for this.
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.
258  ///
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; }
262  };
263 
264  /// A PseudoOpBuilder for Objective-C \@properties.
265  class ObjCPropertyOpBuilder : public PseudoOpBuilder {
266  ObjCPropertyRefExpr *RefExpr;
267  ObjCPropertyRefExpr *SyntacticRefExpr;
268  OpaqueValueExpr *InstanceReceiver;
269  ObjCMethodDecl *Getter;
270 
271  ObjCMethodDecl *Setter;
272  Selector SetterSelector;
273  Selector GetterSelector;
274 
275  public:
276  ObjCPropertyOpBuilder(Sema &S, ObjCPropertyRefExpr *refExpr) :
277  PseudoOpBuilder(S, refExpr->getLocation()), RefExpr(refExpr),
278  SyntacticRefExpr(nullptr), InstanceReceiver(nullptr), Getter(nullptr),
279  Setter(nullptr) {
280  }
281 
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,
289  Expr *op);
290 
291  bool tryBuildGetOfReference(Expr *op, ExprResult &result);
292  bool findSetter(bool warn=true);
293  bool findGetter();
294  void DiagnoseUnsupportedPropertyUse();
295 
296  Expr *rebuildAndCaptureObject(Expr *syntacticBase) override;
297  ExprResult buildGet() override;
298  ExprResult buildSet(Expr *op, SourceLocation, bool) override;
299  ExprResult complete(Expr *SyntacticForm) override;
300 
301  bool isWeakProperty() const;
302  };
303 
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;
311 
312  ObjCMethodDecl *AtIndexSetter;
313  Selector AtIndexSetterSelector;
314 
315  public:
316  ObjCSubscriptOpBuilder(Sema &S, ObjCSubscriptRefExpr *refExpr) :
317  PseudoOpBuilder(S, refExpr->getSourceRange().getBegin()),
318  RefExpr(refExpr),
319  InstanceBase(nullptr), InstanceKey(nullptr),
320  AtIndexGetter(nullptr), AtIndexSetter(nullptr) {}
321 
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;
328 
329  bool findAtIndexGetter();
330  bool findAtIndexSetter();
331 
332  ExprResult buildGet() override;
333  ExprResult buildSet(Expr *op, SourceLocation, bool) override;
334  };
335 
336  class MSPropertyOpBuilder : public PseudoOpBuilder {
337  MSPropertyRefExpr *RefExpr;
338  OpaqueValueExpr *InstanceBase;
339  SmallVector<Expr *, 4> CallArgs;
340 
341  MSPropertyRefExpr *getBaseMSProperty(MSPropertySubscriptExpr *E);
342 
343  public:
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);
351  }
352 
353  Expr *rebuildAndCaptureObject(Expr *) override;
354  ExprResult buildGet() override;
355  ExprResult buildSet(Expr *op, SourceLocation, bool) override;
356  bool captureSetValueAsResult() const override { return false; }
357  };
358 }
359 
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(),
366  e);
367 
368  // Make sure we bind that in the semantics.
369  addSemanticExpr(captured);
370  return captured;
371 }
372 
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.
376 ///
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);
381 
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();
387  return cap;
388  }
389 
390  // Otherwise, it must already be one of our semantic expressions;
391  // set ResultIndex to its index.
392  unsigned index = 0;
393  for (;; ++index) {
394  assert(index < Semantics.size() &&
395  "captured expression not found in semantics!");
396  if (e == Semantics[index]) break;
397  }
398  ResultIndex = index;
399  return cast<OpaqueValueExpr>(e);
400 }
401 
402 /// The routine which creates the final PseudoObjectExpr.
403 ExprResult PseudoOpBuilder::complete(Expr *syntactic) {
404  return PseudoObjectExpr::Create(S.Context, syntactic,
405  Semantics, ResultIndex);
406 }
407 
408 /// The main skeleton for building an r-value operation.
409 ExprResult PseudoOpBuilder::buildRValueOperation(Expr *op) {
410  Expr *syntacticBase = rebuildAndCaptureObject(op);
411 
412  ExprResult getExpr = buildGet();
413  if (getExpr.isInvalid()) return ExprError();
414  addResultSemanticExpr(getExpr.get());
415 
416  return complete(syntacticBase);
417 }
418 
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));
426 
427  Expr *syntacticLHS = rebuildAndCaptureObject(LHS);
428  OpaqueValueExpr *capturedRHS = capture(RHS);
429 
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)) {
438  semanticRHS = RHS;
439  Semantics.pop_back();
440  }
441 
442  Expr *syntactic;
443 
444  ExprResult result;
445  if (opcode == BO_Assign) {
446  result = semanticRHS;
447  syntactic = new (S.Context) BinaryOperator(syntacticLHS, capturedRHS,
448  opcode, capturedRHS->getType(),
449  capturedRHS->getValueKind(),
450  OK_Ordinary, opcLoc,
451  FPOptions());
452  } else {
453  ExprResult opLHS = buildGet();
454  if (opLHS.isInvalid()) return ExprError();
455 
456  // Build an ordinary, non-compound operation.
457  BinaryOperatorKind nonCompound =
459  result = S.BuildBinOp(Sc, opcLoc, nonCompound, opLHS.get(), semanticRHS);
460  if (result.isInvalid()) return ExprError();
461 
462  syntactic =
463  new (S.Context) CompoundAssignOperator(syntacticLHS, capturedRHS, opcode,
464  result.get()->getType(),
465  result.get()->getValueKind(),
466  OK_Ordinary,
467  opLHS.get()->getType(),
468  result.get()->getType(),
469  opcLoc, FPOptions());
470  }
471 
472  // The result of the assignment, if not void, is the value set into
473  // the l-value.
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();
480 
481  return complete(syntactic);
482 }
483 
484 /// The basic skeleton for building an increment or decrement
485 /// operation.
487 PseudoOpBuilder::buildIncDecOperation(Scope *Sc, SourceLocation opcLoc,
488  UnaryOperatorKind opcode,
489  Expr *op) {
491 
492  Expr *syntacticOp = rebuildAndCaptureObject(op);
493 
494  // Load the value.
495  ExprResult result = buildGet();
496  if (result.isInvalid()) return ExprError();
497 
498  QualType resultType = result.get()->getType();
499 
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();
505  }
506 
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,
510  GenericLoc);
511 
512  if (UnaryOperator::isIncrementOp(opcode)) {
513  result = S.BuildBinOp(Sc, opcLoc, BO_Add, result.get(), one);
514  } else {
515  result = S.BuildBinOp(Sc, opcLoc, BO_Sub, result.get(), one);
516  }
517  if (result.isInvalid()) return ExprError();
518 
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();
529 
530  UnaryOperator *syntactic =
531  new (S.Context) UnaryOperator(syntacticOp, opcode, resultType,
532  VK_LValue, OK_Ordinary, opcLoc);
533  return complete(syntactic);
534 }
535 
536 
537 //===----------------------------------------------------------------------===//
538 // Objective-C @property and implicit property references
539 //===----------------------------------------------------------------------===//
540 
541 /// Look up a method in the receiver type of an Objective-C property
542 /// reference.
544  const ObjCPropertyRefExpr *PRE) {
545  if (PRE->isObjectReceiver()) {
546  const ObjCObjectPointerType *PT =
548 
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
553  // methods.
554  ObjCMethodDecl *method =
555  cast<ObjCMethodDecl>(S.CurContext->getNonClosureAncestor());
556  return S.LookupMethodInObjectType(sel,
558  /*instance*/ false);
559  }
560 
561  return S.LookupMethodInObjectType(sel, PT->getPointeeType(), true);
562  }
563 
564  if (PRE->isSuperReceiver()) {
565  if (const ObjCObjectPointerType *PT =
567  return S.LookupMethodInObjectType(sel, PT->getPointeeType(), true);
568 
569  return S.LookupMethodInObjectType(sel, PRE->getSuperReceiverType(), false);
570  }
571 
572  assert(PRE->isClassReceiver() && "Invalid expression");
574  return S.LookupMethodInObjectType(sel, IT, false);
575 }
576 
577 bool ObjCPropertyOpBuilder::isWeakProperty() const {
578  QualType T;
579  if (RefExpr->isExplicitProperty()) {
580  const ObjCPropertyDecl *Prop = RefExpr->getExplicitProperty();
582  return true;
583 
584  T = Prop->getType();
585  } else if (Getter) {
586  T = Getter->getReturnType();
587  } else {
588  return false;
589  }
590 
592 }
593 
594 bool ObjCPropertyOpBuilder::findGetter() {
595  if (Getter) return true;
596 
597  // For implicit properties, just trust the lookup we already did.
598  if (RefExpr->isImplicitProperty()) {
599  if ((Getter = RefExpr->getImplicitPropertyGetter())) {
600  GetterSelector = Getter->getSelector();
601  return true;
602  }
603  else {
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 =
609  IdentifierInfo *getterName =
610  &S.Context.Idents.get(setterName->getName().substr(3));
611  GetterSelector =
612  S.PP.getSelectorTable().getNullarySelector(getterName);
613  return false;
614  }
615  }
616 
617  ObjCPropertyDecl *prop = RefExpr->getExplicitProperty();
618  Getter = LookupMethodInReceiverType(S, prop->getGetterName(), RefExpr);
619  return (Getter != nullptr);
620 }
621 
622 /// Try to find the most accurate setter declaration for the property
623 /// reference.
624 ///
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()) {
630  Setter = setter;
631  SetterSelector = setter->getSelector();
632  return true;
633  } else {
634  IdentifierInfo *getterName =
635  RefExpr->getImplicitPropertyGetter()->getSelector()
636  .getIdentifierInfoForSlot(0);
637  SetterSelector =
639  S.PP.getSelectorTable(),
640  getterName);
641  return false;
642  }
643  }
644 
645  // For explicit properties, this is more involved.
646  ObjCPropertyDecl *prop = RefExpr->getExplicitProperty();
647  SetterSelector = prop->getSetterName();
648 
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);
669  }
670  }
671  Setter = setter;
672  return true;
673  }
674 
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.
679 
680  return false;
681 }
682 
683 void ObjCPropertyOpBuilder::DiagnoseUnsupportedPropertyUse() {
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);
691  }
692  }
693 }
694 
695 /// Capture the base object of an Objective-C property expression.
696 Expr *ObjCPropertyOpBuilder::rebuildAndCaptureObject(Expr *syntacticBase) {
697  assert(InstanceReceiver == nullptr);
698 
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);
706  }
707 
708  if (ObjCPropertyRefExpr *
709  refE = dyn_cast<ObjCPropertyRefExpr>(syntacticBase->IgnoreParens()))
710  SyntacticRefExpr = refE;
711 
712  return syntacticBase;
713 }
714 
715 /// Load from an Objective-C property reference.
716 ExprResult ObjCPropertyOpBuilder::buildGet() {
717  findGetter();
718  if (!Getter) {
719  DiagnoseUnsupportedPropertyUse();
720  return ExprError();
721  }
722 
723  if (SyntacticRefExpr)
724  SyntacticRefExpr->setIsMessagingGetter();
725 
726  QualType receiverType = RefExpr->getReceiverType(S.Context);
727  if (!Getter->isImplicit())
728  S.DiagnoseUseOfDecl(Getter, GenericLoc, nullptr, true);
729  // Build a message-send.
730  ExprResult msg;
731  if ((Getter->isInstanceMethod() && !RefExpr->isClassReceiver()) ||
732  RefExpr->isObjectReceiver()) {
733  assert(InstanceReceiver || RefExpr->isSuperReceiver());
734  msg = S.BuildInstanceMessageImplicit(InstanceReceiver, receiverType,
735  GenericLoc, Getter->getSelector(),
736  Getter, None);
737  } else {
738  msg = S.BuildClassMessageImplicit(receiverType, RefExpr->isSuperReceiver(),
739  GenericLoc, Getter->getSelector(),
740  Getter, None);
741  }
742  return msg;
743 }
744 
745 /// Store to an Objective-C property reference.
746 ///
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();
753  return ExprError();
754  }
755 
756  if (SyntacticRefExpr)
757  SyntacticRefExpr->setIsMessagingSetter();
758 
759  QualType receiverType = RefExpr->getReceiverType(S.Context);
760 
761  // Use assignment constraints when possible; they give us better
762  // diagnostics. "When possible" basically means anything except a
763  // C++ class type.
764  if (!S.getLangOpts().CPlusPlus || !op->getType()->isRecordType()) {
765  QualType paramType = (*Setter->param_begin())->getType()
767  receiverType,
768  Setter->getDeclContext(),
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(),
778  return ExprError();
779 
780  op = opResult.get();
781  assert(op && "successful assignment left argument invalid?");
782  }
783  }
784 
785  // Arguments.
786  Expr *args[] = { op };
787 
788  // Build a message-send.
789  ExprResult msg;
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));
797  } else {
798  msg = S.BuildClassMessageImplicit(receiverType, RefExpr->isSuperReceiver(),
799  GenericLoc,
800  SetterSelector, Setter,
801  MultiExprArg(args, 1));
802  }
803 
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));
810  }
811 
812  return msg;
813 }
814 
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();
822  return ExprError();
823  }
824 
825  ExprResult result = PseudoOpBuilder::buildRValueOperation(op);
826  if (result.isInvalid()) return ExprError();
827 
828  if (RefExpr->isExplicitProperty() && !Getter->hasRelatedResultType())
829  S.DiagnosePropertyAccessorMismatch(RefExpr->getExplicitProperty(),
830  Getter, RefExpr->getLocation());
831 
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);
843  }
844  }
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);
849  }
850 
851  return result;
852 }
853 
854 /// Try to build this as a call to a getter that returns a reference.
855 ///
856 /// \return true if it was possible, whether or not it actually
857 /// succeeded
858 bool ObjCPropertyOpBuilder::tryBuildGetOfReference(Expr *op,
859  ExprResult &result) {
860  if (!S.getLangOpts().CPlusPlus) return false;
861 
862  findGetter();
863  if (!Getter) {
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();
867  return true;
868  }
869 
870  // Only do this if the getter returns an l-value reference type.
871  QualType resultType = Getter->getReturnType();
872  if (!resultType->isLValueReferenceType()) return false;
873 
874  result = buildRValueOperation(op);
875  return true;
876 }
877 
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));
885 
886  // If there's no setter, we have no choice but to try to assign to
887  // the result of the getter.
888  if (!findSetter()) {
889  ExprResult result;
890  if (tryBuildGetOfReference(LHS, result)) {
891  if (result.isInvalid()) return ExprError();
892  return S.BuildBinOp(Sc, opcLoc, opcode, result.get(), RHS);
893  }
894 
895  // Otherwise, it's an error.
896  S.Diag(opcLoc, diag::err_nosetter_property_assignment)
897  << unsigned(RefExpr->isImplicitProperty())
898  << SetterSelector
899  << LHS->getSourceRange() << RHS->getSourceRange();
900  return ExprError();
901  }
902 
903  // If there is a setter, we definitely want to use it.
904 
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();
909  return ExprError();
910  }
911 
912  ExprResult result =
913  PseudoOpBuilder::buildAssignmentOperation(Sc, opcLoc, opcode, LHS, RHS);
914  if (result.isInvalid()) return ExprError();
915 
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);
920  }
921 
922  return result;
923 }
924 
925 /// @property-specific behavior for doing increments and decrements.
927 ObjCPropertyOpBuilder::buildIncDecOperation(Scope *Sc, SourceLocation opcLoc,
928  UnaryOperatorKind opcode,
929  Expr *op) {
930  // If there's no setter, we have no choice but to try to assign to
931  // the result of the getter.
932  if (!findSetter()) {
933  ExprResult result;
934  if (tryBuildGetOfReference(op, result)) {
935  if (result.isInvalid()) return ExprError();
936  return S.BuildUnaryOp(Sc, opcLoc, opcode, result.get());
937  }
938 
939  // Otherwise, it's an error.
940  S.Diag(opcLoc, diag::err_nosetter_property_incdec)
941  << unsigned(RefExpr->isImplicitProperty())
942  << unsigned(UnaryOperator::isDecrementOp(opcode))
943  << SetterSelector
944  << op->getSourceRange();
945  return ExprError();
946  }
947 
948  // If there is a setter, we definitely want to use it.
949 
950  // We also need a getter.
951  if (!findGetter()) {
952  assert(RefExpr->isImplicitProperty());
953  S.Diag(opcLoc, diag::err_nogetter_property_incdec)
954  << unsigned(UnaryOperator::isDecrementOp(opcode))
955  << GetterSelector
956  << op->getSourceRange();
957  return ExprError();
958  }
959 
960  return PseudoOpBuilder::buildIncDecOperation(Sc, opcLoc, opcode, op);
961 }
962 
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());
969 
970  return PseudoOpBuilder::complete(SyntacticForm);
971 }
972 
973 // ObjCSubscript build stuff.
974 //
975 
976 /// objective-c subscripting-specific behavior for doing lvalue-to-rvalue
977 /// conversion.
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();
983  return result;
984 }
985 
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())
995  return ExprError();
996 
997  // Verify that we can do a compound assignment.
998  if (opcode != BO_Assign && !findAtIndexGetter())
999  return ExprError();
1000 
1001  ExprResult result =
1002  PseudoOpBuilder::buildAssignmentOperation(Sc, opcLoc, opcode, LHS, RHS);
1003  if (result.isInvalid()) return ExprError();
1004 
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);
1009  }
1010 
1011  return result;
1012 }
1013 
1014 /// Capture the base object of an Objective-C Index'ed expression.
1015 Expr *ObjCSubscriptOpBuilder::rebuildAndCaptureObject(Expr *syntacticBase) {
1016  assert(InstanceBase == nullptr);
1017 
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());
1022 
1023  syntacticBase =
1024  Rebuilder(S, [=](Expr *, unsigned Idx) -> Expr * {
1025  switch (Idx) {
1026  case 0:
1027  return InstanceBase;
1028  case 1:
1029  return InstanceKey;
1030  default:
1031  llvm_unreachable("Unexpected index for ObjCSubscriptExpr");
1032  }
1033  }).rebuild(syntacticBase);
1034 
1035  return syntacticBase;
1036 }
1037 
1038 /// CheckSubscriptingKind - This routine decide what type
1039 /// of indexing represented by "FromE" is being done.
1042  // If the expression already has integral or enumeration type, we're golden.
1043  QualType T = FromE->getType();
1044  if (T->isIntegralOrEnumerationType())
1045  return OS_Array;
1046 
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>();
1050  if (!RecordTy &&
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(), "@");
1062  else
1063  Diag(FromE->getExprLoc(), diag::err_objc_subscript_type_conversion)
1064  << T;
1065  return OS_Error;
1066  }
1067 
1068  // We must have a complete class type.
1069  if (RequireCompleteType(FromE->getExprLoc(), T,
1070  diag::err_objc_index_incomplete_class_type, FromE))
1071  return OS_Error;
1072 
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;
1077 
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()) {
1084  ++NoIntegrals;
1085  ConversionDecls.push_back(Conversion);
1086  }
1087  else if (CT->isObjCIdType() ||CT->isBlockPointerType()) {
1088  ++NoObjCIdPointers;
1089  ConversionDecls.push_back(Conversion);
1090  }
1091  }
1092  }
1093  if (NoIntegrals ==1 && NoObjCIdPointers == 0)
1094  return OS_Array;
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();
1101  return OS_Error;
1102  }
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);
1108 
1109  return OS_Error;
1110 }
1111 
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,
1115  Expr *Key) {
1116  if (ContainerT.isNull())
1117  return;
1118  // dictionary subscripting.
1119  // - (id)objectForKeyedSubscript:(id)key;
1120  IdentifierInfo *KeyIdents[] = {
1121  &S.Context.Idents.get("objectForKeyedSubscript")
1122  };
1123  Selector GetterSelector = S.Context.Selectors.getSelector(1, KeyIdents);
1124  ObjCMethodDecl *Getter = S.LookupMethodInObjectType(GetterSelector, ContainerT,
1125  true /*instance*/);
1126  if (!Getter)
1127  return;
1128  QualType T = Getter->parameters()[0]->getType();
1129  S.CheckObjCConversion(Key->getSourceRange(), T, Key,
1131 }
1132 
1133 bool ObjCSubscriptOpBuilder::findAtIndexGetter() {
1134  if (AtIndexGetter)
1135  return true;
1136 
1137  Expr *BaseExpr = RefExpr->getBaseExpr();
1138  QualType BaseT = BaseExpr->getType();
1139 
1140  QualType ResultType;
1141  if (const ObjCObjectPointerType *PTy =
1142  BaseT->getAs<ObjCObjectPointerType>()) {
1143  ResultType = PTy->getPointeeType();
1144  }
1146  S.CheckSubscriptingKind(RefExpr->getKeyExpr());
1147  if (Res == Sema::OS_Error) {
1148  if (S.getLangOpts().ObjCAutoRefCount)
1149  CheckKeyForObjCARCConversion(S, ResultType,
1150  RefExpr->getKeyExpr());
1151  return false;
1152  }
1153  bool arrayRef = (Res == Sema::OS_Array);
1154 
1155  if (ResultType.isNull()) {
1156  S.Diag(BaseExpr->getExprLoc(), diag::err_objc_subscript_base_type)
1157  << BaseExpr->getType() << arrayRef;
1158  return false;
1159  }
1160  if (!arrayRef) {
1161  // dictionary subscripting.
1162  // - (id)objectForKeyedSubscript:(id)key;
1163  IdentifierInfo *KeyIdents[] = {
1164  &S.Context.Idents.get("objectForKeyedSubscript")
1165  };
1166  AtIndexGetterSelector = S.Context.Selectors.getSelector(1, KeyIdents);
1167  }
1168  else {
1169  // - (id)objectAtIndexedSubscript:(size_t)index;
1170  IdentifierInfo *KeyIdents[] = {
1171  &S.Context.Idents.get("objectAtIndexedSubscript")
1172  };
1173 
1174  AtIndexGetterSelector = S.Context.Selectors.getSelector(1, KeyIdents);
1175  }
1176 
1177  AtIndexGetter = S.LookupMethodInObjectType(AtIndexGetterSelector, ResultType,
1178  true /*instance*/);
1179 
1180  if (!AtIndexGetter && S.getLangOpts().DebuggerObjCLiteral) {
1181  AtIndexGetter = ObjCMethodDecl::Create(S.Context, SourceLocation(),
1182  SourceLocation(), AtIndexGetterSelector,
1183  S.Context.getObjCIdType() /*ReturnType*/,
1184  nullptr /*TypeSourceInfo */,
1186  true /*Instance*/, false/*isVariadic*/,
1187  /*isPropertyAccessor=*/false,
1188  /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
1190  false);
1191  ParmVarDecl *Argument = ParmVarDecl::Create(S.Context, AtIndexGetter,
1193  arrayRef ? &S.Context.Idents.get("index")
1194  : &S.Context.Idents.get("key"),
1195  arrayRef ? S.Context.UnsignedLongTy
1196  : S.Context.getObjCIdType(),
1197  /*TInfo=*/nullptr,
1198  SC_None,
1199  nullptr);
1200  AtIndexGetter->setMethodParams(S.Context, Argument, None);
1201  }
1202 
1203  if (!AtIndexGetter) {
1204  if (!BaseT->isObjCIdType()) {
1205  S.Diag(BaseExpr->getExprLoc(), diag::err_objc_subscript_method_not_found)
1206  << BaseExpr->getType() << 0 << arrayRef;
1207  return false;
1208  }
1209  AtIndexGetter =
1210  S.LookupInstanceMethodInGlobalPool(AtIndexGetterSelector,
1211  RefExpr->getSourceRange(),
1212  true);
1213  }
1214 
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;
1224  return false;
1225  }
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();
1232  }
1233  }
1234  return true;
1235 }
1236 
1237 bool ObjCSubscriptOpBuilder::findAtIndexSetter() {
1238  if (AtIndexSetter)
1239  return true;
1240 
1241  Expr *BaseExpr = RefExpr->getBaseExpr();
1242  QualType BaseT = BaseExpr->getType();
1243 
1244  QualType ResultType;
1245  if (const ObjCObjectPointerType *PTy =
1246  BaseT->getAs<ObjCObjectPointerType>()) {
1247  ResultType = PTy->getPointeeType();
1248  }
1249 
1251  S.CheckSubscriptingKind(RefExpr->getKeyExpr());
1252  if (Res == Sema::OS_Error) {
1253  if (S.getLangOpts().ObjCAutoRefCount)
1254  CheckKeyForObjCARCConversion(S, ResultType,
1255  RefExpr->getKeyExpr());
1256  return false;
1257  }
1258  bool arrayRef = (Res == Sema::OS_Array);
1259 
1260  if (ResultType.isNull()) {
1261  S.Diag(BaseExpr->getExprLoc(), diag::err_objc_subscript_base_type)
1262  << BaseExpr->getType() << arrayRef;
1263  return false;
1264  }
1265 
1266  if (!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")
1272  };
1273  AtIndexSetterSelector = S.Context.Selectors.getSelector(2, KeyIdents);
1274  }
1275  else {
1276  // - (void)setObject:(id)object atIndexedSubscript:(NSInteger)index;
1277  IdentifierInfo *KeyIdents[] = {
1278  &S.Context.Idents.get("setObject"),
1279  &S.Context.Idents.get("atIndexedSubscript")
1280  };
1281  AtIndexSetterSelector = S.Context.Selectors.getSelector(2, KeyIdents);
1282  }
1283  AtIndexSetter = S.LookupMethodInObjectType(AtIndexSetterSelector, ResultType,
1284  true /*instance*/);
1285 
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);
1297  ParmVarDecl *object = ParmVarDecl::Create(S.Context, AtIndexSetter,
1299  &S.Context.Idents.get("object"),
1300  S.Context.getObjCIdType(),
1301  /*TInfo=*/nullptr,
1302  SC_None,
1303  nullptr);
1304  Params.push_back(object);
1305  ParmVarDecl *key = ParmVarDecl::Create(S.Context, AtIndexSetter,
1307  arrayRef ? &S.Context.Idents.get("index")
1308  : &S.Context.Idents.get("key"),
1309  arrayRef ? S.Context.UnsignedLongTy
1310  : S.Context.getObjCIdType(),
1311  /*TInfo=*/nullptr,
1312  SC_None,
1313  nullptr);
1314  Params.push_back(key);
1315  AtIndexSetter->setMethodParams(S.Context, Params, None);
1316  }
1317 
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;
1323  return false;
1324  }
1325  AtIndexSetter =
1326  S.LookupInstanceMethodInGlobalPool(AtIndexSetterSelector,
1327  RefExpr->getSourceRange(),
1328  true);
1329  }
1330 
1331  bool err = false;
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;
1339  err = true;
1340  }
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;
1347  err = true;
1348  }
1349  }
1350  else if (AtIndexSetter && !arrayRef)
1351  for (unsigned i=0; i <2; i++) {
1352  QualType T = AtIndexSetter->parameters()[i]->getType();
1353  if (!T->isObjCObjectPointerType()) {
1354  if (i == 1)
1355  S.Diag(RefExpr->getKeyExpr()->getExprLoc(),
1356  diag::err_objc_subscript_key_type) << T;
1357  else
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;
1362  err = true;
1363  }
1364  }
1365 
1366  return !err;
1367 }
1368 
1369 // Get the object at "Index" position in the container.
1370 // [BaseExpr objectAtIndexedSubscript : IndexExpr];
1371 ExprResult ObjCSubscriptOpBuilder::buildGet() {
1372  if (!findAtIndexGetter())
1373  return ExprError();
1374 
1375  QualType receiverType = InstanceBase->getType();
1376 
1377  // Build a message-send.
1378  ExprResult msg;
1379  Expr *Index = InstanceKey;
1380 
1381  // Arguments.
1382  Expr *args[] = { Index };
1383  assert(InstanceBase);
1384  if (AtIndexGetter)
1385  S.DiagnoseUseOfDecl(AtIndexGetter, GenericLoc);
1386  msg = S.BuildInstanceMessageImplicit(InstanceBase, receiverType,
1387  GenericLoc,
1388  AtIndexGetterSelector, AtIndexGetter,
1389  MultiExprArg(args, 1));
1390  return msg;
1391 }
1392 
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())
1401  return ExprError();
1402  if (AtIndexSetter)
1403  S.DiagnoseUseOfDecl(AtIndexSetter, GenericLoc);
1404  QualType receiverType = InstanceBase->getType();
1405  Expr *Index = InstanceKey;
1406 
1407  // Arguments.
1408  Expr *args[] = { op, Index };
1409 
1410  // Build a message-send.
1411  ExprResult msg = S.BuildInstanceMessageImplicit(InstanceBase, receiverType,
1412  GenericLoc,
1413  AtIndexSetterSelector,
1414  AtIndexSetter,
1415  MultiExprArg(args, 2));
1416 
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));
1423  }
1424 
1425  return msg;
1426 }
1427 
1428 //===----------------------------------------------------------------------===//
1429 // MSVC __declspec(property) references
1430 //===----------------------------------------------------------------------===//
1431 
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();
1439  }
1440  return cast<MSPropertyRefExpr>(Base);
1441 }
1442 
1443 Expr *MSPropertyOpBuilder::rebuildAndCaptureObject(Expr *syntacticBase) {
1444  InstanceBase = capture(RefExpr->getBaseExpr());
1445  llvm::for_each(CallArgs, [this](Expr *&Arg) { Arg = capture(Arg); });
1446  syntacticBase = Rebuilder(S, [=](Expr *, unsigned Idx) -> Expr * {
1447  switch (Idx) {
1448  case 0:
1449  return InstanceBase;
1450  default:
1451  assert(Idx <= CallArgs.size());
1452  return CallArgs[Idx - 1];
1453  }
1454  }).rebuild(syntacticBase);
1455 
1456  return syntacticBase;
1457 }
1458 
1459 ExprResult MSPropertyOpBuilder::buildGet() {
1460  if (!RefExpr->getPropertyDecl()->hasGetter()) {
1461  S.Diag(RefExpr->getMemberLoc(), diag::err_no_accessor_for_property)
1462  << 0 /* getter */ << RefExpr->getPropertyDecl();
1463  return ExprError();
1464  }
1465 
1466  UnqualifiedId GetterName;
1467  IdentifierInfo *II = RefExpr->getPropertyDecl()->getGetterId();
1468  GetterName.setIdentifier(II, RefExpr->getMemberLoc());
1469  CXXScopeSpec SS;
1470  SS.Adopt(RefExpr->getQualifierLoc());
1471  ExprResult GetterExpr =
1472  S.ActOnMemberAccessExpr(S.getCurScope(), InstanceBase, SourceLocation(),
1473  RefExpr->isArrow() ? tok::arrow : tok::period, SS,
1474  SourceLocation(), GetterName, nullptr);
1475  if (GetterExpr.isInvalid()) {
1476  S.Diag(RefExpr->getMemberLoc(),
1477  diag::err_cannot_find_suitable_accessor) << 0 /* getter */
1478  << RefExpr->getPropertyDecl();
1479  return ExprError();
1480  }
1481 
1482  return S.ActOnCallExpr(S.getCurScope(), GetterExpr.get(),
1483  RefExpr->getSourceRange().getBegin(), CallArgs,
1484  RefExpr->getSourceRange().getEnd());
1485 }
1486 
1487 ExprResult MSPropertyOpBuilder::buildSet(Expr *op, SourceLocation sl,
1488  bool captureSetValueAsResult) {
1489  if (!RefExpr->getPropertyDecl()->hasSetter()) {
1490  S.Diag(RefExpr->getMemberLoc(), diag::err_no_accessor_for_property)
1491  << 1 /* setter */ << RefExpr->getPropertyDecl();
1492  return ExprError();
1493  }
1494 
1495  UnqualifiedId SetterName;
1496  IdentifierInfo *II = RefExpr->getPropertyDecl()->getSetterId();
1497  SetterName.setIdentifier(II, RefExpr->getMemberLoc());
1498  CXXScopeSpec SS;
1499  SS.Adopt(RefExpr->getQualifierLoc());
1500  ExprResult SetterExpr =
1501  S.ActOnMemberAccessExpr(S.getCurScope(), InstanceBase, SourceLocation(),
1502  RefExpr->isArrow() ? tok::arrow : tok::period, SS,
1503  SourceLocation(), SetterName, nullptr);
1504  if (SetterExpr.isInvalid()) {
1505  S.Diag(RefExpr->getMemberLoc(),
1506  diag::err_cannot_find_suitable_accessor) << 1 /* setter */
1507  << RefExpr->getPropertyDecl();
1508  return ExprError();
1509  }
1510 
1511  SmallVector<Expr*, 4> ArgExprs;
1512  ArgExprs.append(CallArgs.begin(), CallArgs.end());
1513  ArgExprs.push_back(op);
1514  return S.ActOnCallExpr(S.getCurScope(), SetterExpr.get(),
1515  RefExpr->getSourceRange().getBegin(), ArgExprs,
1516  op->getSourceRange().getEnd());
1517 }
1518 
1519 //===----------------------------------------------------------------------===//
1520 // General Sema routines.
1521 //===----------------------------------------------------------------------===//
1522 
1524  Expr *opaqueRef = E->IgnoreParens();
1525  if (ObjCPropertyRefExpr *refExpr
1526  = dyn_cast<ObjCPropertyRefExpr>(opaqueRef)) {
1527  ObjCPropertyOpBuilder builder(*this, refExpr);
1528  return builder.buildRValueOperation(E);
1529  }
1530  else if (ObjCSubscriptRefExpr *refExpr
1531  = dyn_cast<ObjCSubscriptRefExpr>(opaqueRef)) {
1532  ObjCSubscriptOpBuilder builder(*this, refExpr);
1533  return builder.buildRValueOperation(E);
1534  } else if (MSPropertyRefExpr *refExpr
1535  = dyn_cast<MSPropertyRefExpr>(opaqueRef)) {
1536  MSPropertyOpBuilder builder(*this, refExpr);
1537  return builder.buildRValueOperation(E);
1538  } else if (MSPropertySubscriptExpr *RefExpr =
1539  dyn_cast<MSPropertySubscriptExpr>(opaqueRef)) {
1540  MSPropertyOpBuilder Builder(*this, RefExpr);
1541  return Builder.buildRValueOperation(E);
1542  } else {
1543  llvm_unreachable("unknown pseudo-object kind!");
1544  }
1545 }
1546 
1547 /// Check an increment or decrement of a pseudo-object expression.
1549  UnaryOperatorKind opcode, Expr *op) {
1550  // Do nothing if the operand is dependent.
1551  if (op->isTypeDependent())
1552  return new (Context) UnaryOperator(op, opcode, Context.DependentTy,
1553  VK_RValue, OK_Ordinary, opcLoc);
1554 
1555  assert(UnaryOperator::isIncrementDecrementOp(opcode));
1556  Expr *opaqueRef = op->IgnoreParens();
1557  if (ObjCPropertyRefExpr *refExpr
1558  = dyn_cast<ObjCPropertyRefExpr>(opaqueRef)) {
1559  ObjCPropertyOpBuilder builder(*this, refExpr);
1560  return builder.buildIncDecOperation(Sc, opcLoc, opcode, op);
1561  } else if (isa<ObjCSubscriptRefExpr>(opaqueRef)) {
1562  Diag(opcLoc, diag::err_illegal_container_subscripting_op);
1563  return ExprError();
1564  } else if (MSPropertyRefExpr *refExpr
1565  = dyn_cast<MSPropertyRefExpr>(opaqueRef)) {
1566  MSPropertyOpBuilder builder(*this, refExpr);
1567  return builder.buildIncDecOperation(Sc, opcLoc, opcode, op);
1568  } else if (MSPropertySubscriptExpr *RefExpr
1569  = dyn_cast<MSPropertySubscriptExpr>(opaqueRef)) {
1570  MSPropertyOpBuilder Builder(*this, RefExpr);
1571  return Builder.buildIncDecOperation(Sc, opcLoc, opcode, op);
1572  } else {
1573  llvm_unreachable("unknown pseudo-object kind!");
1574  }
1575 }
1576 
1578  BinaryOperatorKind opcode,
1579  Expr *LHS, Expr *RHS) {
1580  // Do nothing if either argument is dependent.
1581  if (LHS->isTypeDependent() || RHS->isTypeDependent())
1582  return new (Context) BinaryOperator(LHS, RHS, opcode, Context.DependentTy,
1583  VK_RValue, OK_Ordinary, opcLoc,
1584  FPOptions());
1585 
1586  // Filter out non-overload placeholder types in the RHS.
1587  if (RHS->getType()->isNonOverloadPlaceholderType()) {
1588  ExprResult result = CheckPlaceholderExpr(RHS);
1589  if (result.isInvalid()) return ExprError();
1590  RHS = result.get();
1591  }
1592 
1593  Expr *opaqueRef = LHS->IgnoreParens();
1594  if (ObjCPropertyRefExpr *refExpr
1595  = dyn_cast<ObjCPropertyRefExpr>(opaqueRef)) {
1596  ObjCPropertyOpBuilder builder(*this, refExpr);
1597  return builder.buildAssignmentOperation(S, opcLoc, opcode, LHS, RHS);
1598  } else if (ObjCSubscriptRefExpr *refExpr
1599  = dyn_cast<ObjCSubscriptRefExpr>(opaqueRef)) {
1600  ObjCSubscriptOpBuilder builder(*this, refExpr);
1601  return builder.buildAssignmentOperation(S, opcLoc, opcode, LHS, RHS);
1602  } else if (MSPropertyRefExpr *refExpr
1603  = dyn_cast<MSPropertyRefExpr>(opaqueRef)) {
1604  MSPropertyOpBuilder builder(*this, refExpr);
1605  return builder.buildAssignmentOperation(S, opcLoc, opcode, LHS, RHS);
1606  } else if (MSPropertySubscriptExpr *RefExpr
1607  = dyn_cast<MSPropertySubscriptExpr>(opaqueRef)) {
1608  MSPropertyOpBuilder Builder(*this, RefExpr);
1609  return Builder.buildAssignmentOperation(S, opcLoc, opcode, LHS, RHS);
1610  } else {
1611  llvm_unreachable("unknown pseudo-object kind!");
1612  }
1613 }
1614 
1615 /// Given a pseudo-object reference, rebuild it without the opaque
1616 /// values. Basically, undo the behavior of rebuildAndCaptureObject.
1617 /// This should never operate in-place.
1619  return Rebuilder(S,
1620  [=](Expr *E, unsigned) -> Expr * {
1621  return cast<OpaqueValueExpr>(E)->getSourceExpr();
1622  })
1623  .rebuild(E);
1624 }
1625 
1626 /// Given a pseudo-object expression, recreate what it looks like
1627 /// syntactically without the attendant OpaqueValueExprs.
1628 ///
1629 /// This is a hack which should be removed when TreeTransform is
1630 /// capable of rebuilding a tree without stripping implicit
1631 /// operations.
1633  Expr *syntax = E->getSyntacticForm();
1634  if (UnaryOperator *uop = dyn_cast<UnaryOperator>(syntax)) {
1635  Expr *op = stripOpaqueValuesFromPseudoObjectRef(*this, uop->getSubExpr());
1636  return new (Context) UnaryOperator(op, uop->getOpcode(), uop->getType(),
1637  uop->getValueKind(), uop->getObjectKind(),
1638  uop->getOperatorLoc());
1639  } else if (CompoundAssignOperator *cop
1640  = dyn_cast<CompoundAssignOperator>(syntax)) {
1641  Expr *lhs = stripOpaqueValuesFromPseudoObjectRef(*this, cop->getLHS());
1642  Expr *rhs = cast<OpaqueValueExpr>(cop->getRHS())->getSourceExpr();
1643  return new (Context) CompoundAssignOperator(lhs, rhs, cop->getOpcode(),
1644  cop->getType(),
1645  cop->getValueKind(),
1646  cop->getObjectKind(),
1647  cop->getComputationLHSType(),
1648  cop->getComputationResultType(),
1649  cop->getOperatorLoc(),
1650  FPOptions());
1651  } else if (BinaryOperator *bop = dyn_cast<BinaryOperator>(syntax)) {
1652  Expr *lhs = stripOpaqueValuesFromPseudoObjectRef(*this, bop->getLHS());
1653  Expr *rhs = cast<OpaqueValueExpr>(bop->getRHS())->getSourceExpr();
1654  return new (Context) BinaryOperator(lhs, rhs, bop->getOpcode(),
1655  bop->getType(), bop->getValueKind(),
1656  bop->getObjectKind(),
1657  bop->getOperatorLoc(), FPOptions());
1658  } else {
1659  assert(syntax->hasPlaceholderType(BuiltinType::PseudoObject));
1660  return stripOpaqueValuesFromPseudoObjectRef(*this, syntax);
1661  }
1662 }
ObjCPropertyRefExpr - A dot-syntax expression to access an ObjC property.
Definition: ExprObjC.h:577
ObjCPropertyQueryKind getQueryKind() const
Definition: DeclObjC.h:898
bool isIncrementOp() const
Definition: Expr.h:1767
static DiagnosticBuilder Diag(DiagnosticsEngine *Diags, const LangOptions &Features, FullSourceLoc TokLoc, const char *TokBegin, const char *TokRangeBegin, const char *TokRangeEnd, unsigned DiagID)
Produce a diagnostic highlighting some portion of a literal.
bool isSelfExpr(Expr *RExpr)
Private Helper predicate to check for &#39;self&#39;.
Expr * getSyntacticForm()
Return the syntactic form of this expression, i.e.
Definition: Expr.h:5013
Smart pointer class that efficiently represents Objective-C method names.
QualType getObjCIdType() const
Represents the Objective-CC id type.
Definition: ASTContext.h:1800
SelectorTable & getSelectorTable()
Definition: Preprocessor.h:821
A (possibly-)qualified type.
Definition: Type.h:653
bool isBlockPointerType() const
Definition: Type.h:5952
static Opcode getOpForCompoundAssignment(Opcode Opc)
Definition: Expr.h:3119
ObjCMethodDecl * getAtIndexMethodDecl() const
Definition: ExprObjC.h:853
ObjCInterfaceDecl * getClassInterface()
Definition: DeclObjC.cpp:1101
bool isSuperReceiver() const
Definition: ExprObjC.h:739
ARCConversionResult CheckObjCConversion(SourceRange castRange, QualType castType, Expr *&op, CheckedConversionKind CCK, bool Diagnose=true, bool DiagnoseCFAudited=false, BinaryOperatorKind Opc=BO_PtrMemD)
Checks for invalid conversions and casts between retainable pointers and other pointer kinds for ARC ...
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee...
Definition: Type.cpp:456
ObjCMethodDecl * setAtIndexMethodDecl() const
Definition: ExprObjC.h:857
ObjCMethodDecl * LookupMethodInObjectType(Selector Sel, QualType Ty, bool IsInstance)
LookupMethodInType - Look up a method in an ObjCObjectType.
bool hasPlaceholderType() const
Returns whether this expression has a placeholder type.
Definition: Expr.h:472
bool isRecordType() const
Definition: Type.h:6017
ObjCSubscriptKind
Definition: Sema.h:2665
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1270
ObjCMethodDecl * getImplicitPropertySetter() const
Definition: ExprObjC.h:680
AssignConvertType
AssignConvertType - All of the &#39;assignment&#39; semantic checks return this enum to indicate whether the ...
Definition: Sema.h:9345
ParenExpr - This represents a parethesized expression, e.g.
Definition: Expr.h:1665
bool isObjCContainer() const
Definition: DeclBase.h:1368
ObjCSubscriptRefExpr - used for array and dictionary subscripting.
Definition: ExprObjC.h:802
A container of type source information.
Definition: Decl.h:86
Floating point control options.
Definition: LangOptions.h:208
MS property subscript expression.
Definition: ExprCXX.h:797
void Adopt(NestedNameSpecifierLoc Other)
Adopt an existing nested-name-specifier (with source-range information).
Definition: DeclSpec.cpp:125
DiagnosticsEngine & Diags
Definition: Sema.h:318
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6307
ObjCInterfaceDecl * getClassReceiver() const
Definition: ExprObjC.h:734
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:139
static void CheckKeyForObjCARCConversion(Sema &S, QualType ContainerT, Expr *Key)
CheckKeyForObjCARCConversion - This routine suggests bridge casting of CF objects used as dictionary ...
ExprResult BuildUnaryOp(Scope *S, SourceLocation OpLoc, UnaryOperatorKind Opc, Expr *Input)
Definition: SemaExpr.cpp:12397
ParmVarDecl - Represents a parameter to a function.
Definition: Decl.h:1514
Defines the clang::Expr interface and subclasses for C++ expressions.
ObjCPropertyDecl * getExplicitProperty() const
Definition: ExprObjC.h:670
ExprResult ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc, MultiExprArg ArgExprs, SourceLocation RParenLoc, Expr *ExecConfig=nullptr, bool IsExecConfig=false)
ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
Definition: SemaExpr.cpp:5215
One of these records is kept for each identifier that is lexed.
bool isExplicitProperty() const
Definition: ExprObjC.h:668
bool isObjCIdType() const
Definition: Type.h:6070
ExprResult BuildClassMessageImplicit(QualType ReceiverType, bool isSuperReceiver, SourceLocation Loc, Selector Sel, ObjCMethodDecl *Method, MultiExprArg Args)
ObjCSubscriptKind CheckSubscriptingKind(Expr *FromE)
CheckSubscriptingKind - This routine decide what type of indexing represented by "FromE" is being don...
bool isAssignmentOp() const
Definition: Expr.h:3111
bool isIntegralOrEnumerationType() const
Determine whether this type is an integral or enumeration type.
Definition: Type.h:6221
IdentifierTable & Idents
Definition: ASTContext.h:537
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:107
bool isGLValue() const
Definition: Expr.h:252
static ObjCMethodDecl * LookupMethodInReceiverType(Sema &S, Selector sel, const ObjCPropertyRefExpr *PRE)
Look up a method in the receiver type of an Objective-C property reference.
static Selector constructSetterSelector(IdentifierTable &Idents, SelectorTable &SelTable, const IdentifierInfo *Name)
Return the default setter selector for the given identifier.
Expr * getKeyExpr() const
Definition: ExprObjC.h:850
BinaryOperatorKind
Represents a C++ unqualified-id that has been parsed.
Definition: DeclSpec.h:886
bool isPostfix() const
Definition: Expr.h:1762
Selector getNullarySelector(IdentifierInfo *ID)
PtrTy get() const
Definition: Ownership.h:162
Expr * getBaseExpr() const
Definition: ExprObjC.h:847
static Expr * stripOpaqueValuesFromPseudoObjectRef(Sema &S, Expr *E)
Given a pseudo-object reference, rebuild it without the opaque values.
ExprValueKind getValueKind() const
getValueKind - The value kind that this expression produces.
Definition: Expr.h:405
PropertyAttributeKind getPropertyAttributes() const
Definition: DeclObjC.h:857
A builtin binary operation expression such as "x + y" or "x <= y".
Definition: Expr.h:2985
bool isClassReceiver() const
Definition: ExprObjC.h:740
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:39
bool isArrow() const
Definition: ExprCXX.h:781
Represents a C++ nested-name-specifier or a global scope specifier.
Definition: DeclSpec.h:63
Preprocessor & PP
Definition: Sema.h:315
const LangOptions & getLangOpts() const
Definition: Sema.h:1193
static IntegerLiteral * Create(const ASTContext &C, const llvm::APInt &V, QualType type, SourceLocation l)
Returns a new integer literal with value &#39;V&#39; and type &#39;type&#39;.
Definition: Expr.cpp:748
bool isTypeDependent() const
isTypeDependent - Determines whether this expression is type-dependent (C++ [temp.dep.expr]), which means that its type could change from one template instantiation to the next.
Definition: Expr.h:167
AssignConvertType CheckSingleAssignmentConstraints(QualType LHSType, ExprResult &RHS, bool Diagnose=true, bool DiagnoseCFAudited=false, bool ConvertRHS=true)
Check assignment constraints for an assignment of RHS to LHSType.
Definition: SemaExpr.cpp:7923
An ordinary object is located at an address in memory.
Definition: Specifiers.h:123
Represents an ObjC class declaration.
Definition: DeclObjC.h:1191
ExprResult checkPseudoObjectIncDec(Scope *S, SourceLocation OpLoc, UnaryOperatorKind Opcode, Expr *Op)
Check an increment or decrement of a pseudo-object expression.
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:274
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1590
SourceLocation getRBracket() const
Definition: ExprObjC.h:838
bool isNonOverloadPlaceholderType() const
Test for a placeholder type other than Overload; see BuiltinType::isNonOverloadPlaceholderType.
Definition: Type.h:6165
SourceLocation getRBracketLoc() const
Definition: ExprCXX.h:835
Scope * getCurScope() const
Retrieve the parser&#39;s current scope.
Definition: Sema.h:10516
Expr - This represents one expression.
Definition: Expr.h:106
static ObjCMethodDecl * Create(ASTContext &C, SourceLocation beginLoc, SourceLocation endLoc, Selector SelInfo, QualType T, TypeSourceInfo *ReturnTInfo, DeclContext *contextDecl, bool isInstance=true, bool isVariadic=false, bool isPropertyAccessor=false, bool isImplicitlyDeclared=false, bool isDefined=false, ImplementationControl impControl=None, bool HasRelatedResultType=false)
Definition: DeclObjC.cpp:772
Selector getSetterName() const
Definition: DeclObjC.h:931
const FunctionProtoType * T
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:6370
Defines the clang::Preprocessor interface.
Decl * getNonClosureAncestor()
Find the nearest non-closure ancestor of this context, i.e.
Definition: DeclBase.cpp:961
bool DiagnoseAssignmentResult(AssignConvertType ConvTy, SourceLocation Loc, QualType DstType, QualType SrcType, Expr *SrcExpr, AssignmentAction Action, bool *Complained=nullptr)
DiagnoseAssignmentResult - Emit a diagnostic, if required, for the assignment conversion type specifi...
Definition: SemaExpr.cpp:13260
QualType getType() const
Definition: Expr.h:128
QualType substObjCMemberType(QualType objectType, const DeclContext *dc, ObjCSubstitutionContext context) const
Substitute type arguments from an object type for the Objective-C type parameters used in the subject...
Definition: Type.cpp:1305
An expression that sends a message to the given Objective-C object or class.
Definition: ExprObjC.h:903
ObjCMethodDecl * getImplicitPropertyGetter() const
Definition: ExprObjC.h:675
bool isInvalid() const
Definition: Ownership.h:158
QualType getObjCInterfaceType(const ObjCInterfaceDecl *Decl, ObjCInterfaceDecl *PrevDecl=nullptr) const
getObjCInterfaceType - Return the unique reference to the type for the specified ObjC interface decl...
SourceLocation getEnd() const
UnaryOperator - This represents the unary-expression&#39;s (except sizeof and alignof), the postinc/postdec operators from postfix-expression, and various extensions.
Definition: Expr.h:1717
A member reference to an MSPropertyDecl.
Definition: ExprCXX.h:728
Selector getSelector() const
Definition: DeclObjC.h:359
Represents a C++ conversion function within a class.
Definition: DeclCXX.h:2682
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:719
QualType getType() const
Definition: DeclObjC.h:846
Expr * getArg(unsigned Arg)
getArg - Return the specified argument.
Definition: ExprObjC.h:1341
bool isDecrementOp() const
Definition: Expr.h:1774
ExprObjectKind getObjectKind() const
getObjectKind - The object kind that this expression produces.
Definition: Expr.h:412
bool isVoidPointerType() const
Definition: Type.cpp:426
RecordDecl * getDecl() const
Definition: Type.h:3988
Decl::Kind getDeclKind() const
Definition: DeclBase.h:1324
OpaqueValueExpr - An expression referring to an opaque object of a fixed type and value class...
Definition: Expr.h:868
LLVM_READONLY char toLowercase(char c)
Converts the given ASCII character to its lowercase equivalent.
Definition: CharInfo.h:165
SelectorTable & Selectors
Definition: ASTContext.h:538
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:144
PseudoObjectExpr - An expression which accesses a pseudo-object l-value.
Definition: Expr.h:4969
IdentifierInfo * getIdentifierInfoForSlot(unsigned argIndex) const
Retrieve the identifier at a given position in the selector.
Encodes a location in the source.
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
void checkRetainCycles(ObjCMessageExpr *msg)
checkRetainCycles - Check whether an Objective-C message send might create an obvious retain cycle...
IdentifierTable & getIdentifierTable()
Definition: Preprocessor.h:819
CanQualType VoidTy
Definition: ASTContext.h:996
bool isValueDependent() const
isValueDependent - Determines whether this expression is value-dependent (C++ [temp.dep.constexpr]).
Definition: Expr.h:149
bool isObjCObjectPointerType() const
Definition: Type.h:6041
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:746
#define exp(__x)
Definition: tgmath.h:447
MutableArrayRef< Expr * > MultiExprArg
Definition: Ownership.h:261
LLVM_READONLY bool isLowercase(unsigned char c)
Return true if this character is a lowercase ASCII letter: [a-z].
Definition: CharInfo.h:100
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:216
CompoundAssignOperator - For compound assignments (e.g.
Definition: Expr.h:3191
StringRef getName() const
Return the actual identifier string.
Represents a C11 generic selection.
Definition: Expr.h:4684
SourceLocation getMemberLoc() const
Definition: ExprCXX.h:782
static ParmVarDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, StorageClass S, Expr *DefArg)
Definition: Decl.cpp:2451
Dataflow Directional Tag Classes.
void recordUseOfEvaluatedWeak(const ExprT *E, bool IsRead=true)
Definition: Sema.h:1337
UnaryOperatorKind
SourceLocation getLocation() const
Definition: ExprObjC.h:726
Expr * recreateSyntacticForm(PseudoObjectExpr *E)
Given a pseudo-object expression, recreate what it looks like syntactically without the attendant Opa...
ExprResult checkPseudoObjectAssignment(Scope *S, SourceLocation OpLoc, BinaryOperatorKind Opcode, Expr *LHS, Expr *RHS)
ExprResult ImpCastExprToType(Expr *E, QualType Type, CastKind CK, ExprValueKind VK=VK_RValue, const CXXCastPath *BasePath=nullptr, CheckedConversionKind CCK=CCK_ImplicitConversion)
ImpCastExprToType - If Expr is not of type &#39;Type&#39;, insert an implicit cast.
Definition: Sema.cpp:466
MSPropertyDecl * getPropertyDecl() const
Definition: ExprCXX.h:780
SourceRange getSourceRange(const SourceRange &Range)
Returns the SourceRange of a SourceRange.
Definition: FixIt.h:34
bool isObjCClassType() const
True if this is equivalent to the &#39;Class&#39; type, i.e.
Definition: Type.h:5510
bool DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc, const ObjCInterfaceDecl *UnknownObjCClass=nullptr, bool ObjCPropertyAccess=false, bool AvoidPartialAvailabilityChecks=false)
Determine whether the use of this declaration is valid, and emit any corresponding diagnostics...
Definition: SemaExpr.cpp:204
static PseudoObjectExpr * Create(const ASTContext &Context, Expr *syntactic, ArrayRef< Expr *> semantic, unsigned resultIndex)
Definition: Expr.cpp:3905
ExprResult ActOnMemberAccessExpr(Scope *S, Expr *Base, SourceLocation OpLoc, tok::TokenKind OpKind, CXXScopeSpec &SS, SourceLocation TemplateKWLoc, UnqualifiedId &Member, Decl *ObjCImpDecl)
The main callback when the parser finds something like expression .
NestedNameSpecifierLoc getQualifierLoc() const
Definition: ExprCXX.h:783
Expr * IgnoreParenImpCasts() LLVM_READONLY
IgnoreParenImpCasts - Ignore parentheses and implicit casts.
Definition: Expr.cpp:2550
ExprResult checkPseudoObjectRValue(Expr *E)
void markSafeWeakUse(const Expr *E)
Record that a given expression is a "safe" access of a weak object (e.g.
Definition: ScopeInfo.cpp:170
Represents a pointer to an Objective C object.
Definition: Type.h:5442
ObjCMethodDecl * LookupInstanceMethodInGlobalPool(Selector Sel, SourceRange R, bool receiverIdOrClass=false)
LookupInstanceMethodInGlobalPool - Returns the method and warns if there are multiple signatures...
Definition: Sema.h:3595
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:3978
CanQualType UnsignedLongTy
Definition: ASTContext.h:1005
Selector getSelector(unsigned NumArgs, IdentifierInfo **IIV)
Can create any sort of selector.
CanQualType DependentTy
Definition: ASTContext.h:1013
DeclContext * getCurLexicalContext() const
Definition: Sema.h:10527
static FixItHint CreateInsertion(SourceLocation InsertionLoc, StringRef Code, bool BeforePreviousInsertions=false)
Create a code modification hint that inserts the given code string at a specific location.
Definition: Diagnostic.h:90
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2007
bool isIncompleteType(NamedDecl **Def=nullptr) const
Types are partitioned into 3 broad categories (C99 6.2.5p1): object types, function types...
Definition: Type.cpp:1986
An implicit conversion.
Definition: Sema.h:9223
bool isLValueReferenceType() const
Definition: Type.h:5960
Reading or writing from this object requires a barrier call.
Definition: Type.h:183
QualType getSuperReceiverType() const
Definition: ExprObjC.h:730
TranslationUnitDecl * getTranslationUnitDecl() const
Definition: ASTContext.h:989
Represents a C++ struct/union/class.
Definition: DeclCXX.h:299
sema::FunctionScopeInfo * getCurFunction() const
Definition: Sema.h:1320
ChooseExpr - GNU builtin-in function __builtin_choose_expr.
Definition: Expr.h:3664
The parameter type of a method or function.
DeclContext * CurContext
CurContext - This is the current declaration context of parsing.
Definition: Sema.h:328
bool isPrefix() const
Definition: Expr.h:1761
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:265
ExprResult BuildInstanceMessageImplicit(Expr *Receiver, QualType ReceiverType, SourceLocation Loc, Selector Sel, ObjCMethodDecl *Method, MultiExprArg Args)
StringRef getName() const
getName - Get the name of identifier for this declaration as a StringRef.
Definition: Decl.h:270
ExprResult ExprError()
Definition: Ownership.h:267
LLVM_READONLY char toUppercase(char c)
Converts the given ASCII character to its uppercase equivalent.
Definition: CharInfo.h:174
bool DiagnosePropertyAccessorMismatch(ObjCPropertyDecl *PD, ObjCMethodDecl *Getter, SourceLocation Loc)
CanQualType IntTy
Definition: ASTContext.h:1004
bool isObjectReceiver() const
Definition: ExprObjC.h:738
bool isDependentType() const
Whether this type is a dependent type, meaning that its definition somehow depends on a template para...
Definition: Type.h:1860
bool isIgnored(unsigned DiagID, SourceLocation Loc) const
Determine whether the diagnostic is known to be ignored.
Definition: Diagnostic.h:734
bool isIncrementDecrementOp() const
Definition: Expr.h:1779
void checkUnsafeExprAssigns(SourceLocation Loc, Expr *LHS, Expr *RHS)
checkUnsafeExprAssigns - Check whether +1 expr is being assigned to weak/__unsafe_unretained expressi...
An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:111
const Expr * getBase() const
Definition: ExprObjC.h:719
ASTContext & Context
Definition: Sema.h:316
NamedDecl - This represents a decl with a name.
Definition: Decl.h:245
void setIdentifier(const IdentifierInfo *Id, SourceLocation IdLoc)
Specify that this unqualified-id was parsed as an identifier.
Definition: DeclSpec.h:995
ExprResult BuildBinOp(Scope *S, SourceLocation OpLoc, BinaryOperatorKind Opc, Expr *LHSExpr, Expr *RHSExpr)
Definition: SemaExpr.cpp:12049
Selector getGetterName() const
Definition: DeclObjC.h:923
SourceLocation getLocStart() const LLVM_READONLY
Definition: Stmt.cpp:277
void setArg(unsigned Arg, Expr *ArgExpr)
setArg - Set the specified argument.
Definition: ExprObjC.h:1351
Expr * getBaseExpr() const
Definition: ExprCXX.h:779
SourceLocation getLocation() const
Definition: DeclBase.h:416
ArrayRef< ParmVarDecl * > parameters() const
Definition: DeclObjC.h:405
Expr * IgnoreParens() LLVM_READONLY
IgnoreParens - Ignore parentheses.
Definition: Expr.cpp:2432
Qualifiers::ObjCLifetime getObjCLifetime() const
Returns lifetime attribute of this type.
Definition: Type.h:1072
QualType getPointeeType() const
Gets the type pointed to by this ObjC pointer.
Definition: Type.h:5458