clang  11.0.0git
BodyFarm.cpp
Go to the documentation of this file.
1 //== BodyFarm.cpp - Factory for conjuring up fake bodies ----------*- C++ -*-//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // BodyFarm is a factory for creating faux implementations for functions/methods
10 // for analysis purposes.
11 //
12 //===----------------------------------------------------------------------===//
13 
15 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/Decl.h"
18 #include "clang/AST/Expr.h"
19 #include "clang/AST/ExprCXX.h"
20 #include "clang/AST/ExprObjC.h"
24 #include "llvm/ADT/StringSwitch.h"
25 #include "llvm/Support/Debug.h"
26 
27 #define DEBUG_TYPE "body-farm"
28 
29 using namespace clang;
30 
31 //===----------------------------------------------------------------------===//
32 // Helper creation functions for constructing faux ASTs.
33 //===----------------------------------------------------------------------===//
34 
35 static bool isDispatchBlock(QualType Ty) {
36  // Is it a block pointer?
37  const BlockPointerType *BPT = Ty->getAs<BlockPointerType>();
38  if (!BPT)
39  return false;
40 
41  // Check if the block pointer type takes no arguments and
42  // returns void.
43  const FunctionProtoType *FT =
45  return FT && FT->getReturnType()->isVoidType() && FT->getNumParams() == 0;
46 }
47 
48 namespace {
49 class ASTMaker {
50 public:
51  ASTMaker(ASTContext &C) : C(C) {}
52 
53  /// Create a new BinaryOperator representing a simple assignment.
54  BinaryOperator *makeAssignment(const Expr *LHS, const Expr *RHS, QualType Ty);
55 
56  /// Create a new BinaryOperator representing a comparison.
57  BinaryOperator *makeComparison(const Expr *LHS, const Expr *RHS,
59 
60  /// Create a new compound stmt using the provided statements.
61  CompoundStmt *makeCompound(ArrayRef<Stmt*>);
62 
63  /// Create a new DeclRefExpr for the referenced variable.
64  DeclRefExpr *makeDeclRefExpr(const VarDecl *D,
65  bool RefersToEnclosingVariableOrCapture = false);
66 
67  /// Create a new UnaryOperator representing a dereference.
68  UnaryOperator *makeDereference(const Expr *Arg, QualType Ty);
69 
70  /// Create an implicit cast for an integer conversion.
71  Expr *makeIntegralCast(const Expr *Arg, QualType Ty);
72 
73  /// Create an implicit cast to a builtin boolean type.
74  ImplicitCastExpr *makeIntegralCastToBoolean(const Expr *Arg);
75 
76  /// Create an implicit cast for lvalue-to-rvaluate conversions.
77  ImplicitCastExpr *makeLvalueToRvalue(const Expr *Arg, QualType Ty);
78 
79  /// Make RValue out of variable declaration, creating a temporary
80  /// DeclRefExpr in the process.
82  makeLvalueToRvalue(const VarDecl *Decl,
83  bool RefersToEnclosingVariableOrCapture = false);
84 
85  /// Create an implicit cast of the given type.
86  ImplicitCastExpr *makeImplicitCast(const Expr *Arg, QualType Ty,
87  CastKind CK = CK_LValueToRValue);
88 
89  /// Create an Objective-C bool literal.
90  ObjCBoolLiteralExpr *makeObjCBool(bool Val);
91 
92  /// Create an Objective-C ivar reference.
93  ObjCIvarRefExpr *makeObjCIvarRef(const Expr *Base, const ObjCIvarDecl *IVar);
94 
95  /// Create a Return statement.
96  ReturnStmt *makeReturn(const Expr *RetVal);
97 
98  /// Create an integer literal expression of the given type.
99  IntegerLiteral *makeIntegerLiteral(uint64_t Value, QualType Ty);
100 
101  /// Create a member expression.
102  MemberExpr *makeMemberExpression(Expr *base, ValueDecl *MemberDecl,
103  bool IsArrow = false,
104  ExprValueKind ValueKind = VK_LValue);
105 
106  /// Returns a *first* member field of a record declaration with a given name.
107  /// \return an nullptr if no member with such a name exists.
108  ValueDecl *findMemberField(const RecordDecl *RD, StringRef Name);
109 
110 private:
111  ASTContext &C;
112 };
113 }
114 
115 BinaryOperator *ASTMaker::makeAssignment(const Expr *LHS, const Expr *RHS,
116  QualType Ty) {
117  return BinaryOperator::Create(
118  C, const_cast<Expr *>(LHS), const_cast<Expr *>(RHS), BO_Assign, Ty,
120 }
121 
122 BinaryOperator *ASTMaker::makeComparison(const Expr *LHS, const Expr *RHS,
124  assert(BinaryOperator::isLogicalOp(Op) ||
126  return BinaryOperator::Create(
127  C, const_cast<Expr *>(LHS), const_cast<Expr *>(RHS), Op,
128  C.getLogicalOperationType(), VK_RValue, OK_Ordinary, SourceLocation(),
130 }
131 
132 CompoundStmt *ASTMaker::makeCompound(ArrayRef<Stmt *> Stmts) {
134 }
135 
136 DeclRefExpr *ASTMaker::makeDeclRefExpr(
137  const VarDecl *D,
138  bool RefersToEnclosingVariableOrCapture) {
140 
142  C, NestedNameSpecifierLoc(), SourceLocation(), const_cast<VarDecl *>(D),
143  RefersToEnclosingVariableOrCapture, SourceLocation(), Type, VK_LValue);
144  return DR;
145 }
146 
147 UnaryOperator *ASTMaker::makeDereference(const Expr *Arg, QualType Ty) {
148  return UnaryOperator::Create(C, const_cast<Expr *>(Arg), UO_Deref, Ty,
150  /*CanOverflow*/ false, FPOptionsOverride());
151 }
152 
153 ImplicitCastExpr *ASTMaker::makeLvalueToRvalue(const Expr *Arg, QualType Ty) {
154  return makeImplicitCast(Arg, Ty, CK_LValueToRValue);
155 }
156 
158 ASTMaker::makeLvalueToRvalue(const VarDecl *Arg,
159  bool RefersToEnclosingVariableOrCapture) {
161  return makeLvalueToRvalue(makeDeclRefExpr(Arg,
162  RefersToEnclosingVariableOrCapture),
163  Type);
164 }
165 
166 ImplicitCastExpr *ASTMaker::makeImplicitCast(const Expr *Arg, QualType Ty,
167  CastKind CK) {
168  return ImplicitCastExpr::Create(C, Ty,
169  /* CastKind=*/ CK,
170  /* Expr=*/ const_cast<Expr *>(Arg),
171  /* CXXCastPath=*/ nullptr,
172  /* ExprValueKind=*/ VK_RValue);
173 }
174 
175 Expr *ASTMaker::makeIntegralCast(const Expr *Arg, QualType Ty) {
176  if (Arg->getType() == Ty)
177  return const_cast<Expr*>(Arg);
178 
179  return ImplicitCastExpr::Create(C, Ty, CK_IntegralCast,
180  const_cast<Expr*>(Arg), nullptr, VK_RValue);
181 }
182 
183 ImplicitCastExpr *ASTMaker::makeIntegralCastToBoolean(const Expr *Arg) {
184  return ImplicitCastExpr::Create(C, C.BoolTy, CK_IntegralToBoolean,
185  const_cast<Expr*>(Arg), nullptr, VK_RValue);
186 }
187 
188 ObjCBoolLiteralExpr *ASTMaker::makeObjCBool(bool Val) {
189  QualType Ty = C.getBOOLDecl() ? C.getBOOLType() : C.ObjCBuiltinBoolTy;
190  return new (C) ObjCBoolLiteralExpr(Val, Ty, SourceLocation());
191 }
192 
193 ObjCIvarRefExpr *ASTMaker::makeObjCIvarRef(const Expr *Base,
194  const ObjCIvarDecl *IVar) {
195  return new (C) ObjCIvarRefExpr(const_cast<ObjCIvarDecl*>(IVar),
196  IVar->getType(), SourceLocation(),
197  SourceLocation(), const_cast<Expr*>(Base),
198  /*arrow=*/true, /*free=*/false);
199 }
200 
201 ReturnStmt *ASTMaker::makeReturn(const Expr *RetVal) {
202  return ReturnStmt::Create(C, SourceLocation(), const_cast<Expr *>(RetVal),
203  /* NRVOCandidate=*/nullptr);
204 }
205 
206 IntegerLiteral *ASTMaker::makeIntegerLiteral(uint64_t Value, QualType Ty) {
207  llvm::APInt APValue = llvm::APInt(C.getTypeSize(Ty), Value);
208  return IntegerLiteral::Create(C, APValue, Ty, SourceLocation());
209 }
210 
211 MemberExpr *ASTMaker::makeMemberExpression(Expr *base, ValueDecl *MemberDecl,
212  bool IsArrow,
213  ExprValueKind ValueKind) {
214 
215  DeclAccessPair FoundDecl = DeclAccessPair::make(MemberDecl, AS_public);
216  return MemberExpr::Create(
217  C, base, IsArrow, SourceLocation(), NestedNameSpecifierLoc(),
218  SourceLocation(), MemberDecl, FoundDecl,
220  /* TemplateArgumentListInfo=*/ nullptr, MemberDecl->getType(), ValueKind,
222 }
223 
224 ValueDecl *ASTMaker::findMemberField(const RecordDecl *RD, StringRef Name) {
225 
226  CXXBasePaths Paths(
227  /* FindAmbiguities=*/false,
228  /* RecordPaths=*/false,
229  /* DetectVirtual=*/ false);
230  const IdentifierInfo &II = C.Idents.get(Name);
231  DeclarationName DeclName = C.DeclarationNames.getIdentifier(&II);
232 
233  DeclContextLookupResult Decls = RD->lookup(DeclName);
234  for (NamedDecl *FoundDecl : Decls)
235  if (!FoundDecl->getDeclContext()->isFunctionOrMethod())
236  return cast<ValueDecl>(FoundDecl);
237 
238  return nullptr;
239 }
240 
241 //===----------------------------------------------------------------------===//
242 // Creation functions for faux ASTs.
243 //===----------------------------------------------------------------------===//
244 
245 typedef Stmt *(*FunctionFarmer)(ASTContext &C, const FunctionDecl *D);
246 
248  const ParmVarDecl *Callback,
249  ArrayRef<Expr *> CallArgs) {
250 
251  QualType Ty = Callback->getType();
252  DeclRefExpr *Call = M.makeDeclRefExpr(Callback);
253  Expr *SubExpr;
254  if (Ty->isRValueReferenceType()) {
255  SubExpr = M.makeImplicitCast(
256  Call, Ty.getNonReferenceType(), CK_LValueToRValue);
257  } else if (Ty->isLValueReferenceType() &&
258  Call->getType()->isFunctionType()) {
259  Ty = C.getPointerType(Ty.getNonReferenceType());
260  SubExpr = M.makeImplicitCast(Call, Ty, CK_FunctionToPointerDecay);
261  } else if (Ty->isLValueReferenceType()
262  && Call->getType()->isPointerType()
263  && Call->getType()->getPointeeType()->isFunctionType()){
264  SubExpr = Call;
265  } else {
266  llvm_unreachable("Unexpected state");
267  }
268 
269  return CallExpr::Create(C, SubExpr, CallArgs, C.VoidTy, VK_RValue,
270  SourceLocation());
271 }
272 
274  const ParmVarDecl *Callback,
275  CXXRecordDecl *CallbackDecl,
276  ArrayRef<Expr *> CallArgs) {
277  assert(CallbackDecl != nullptr);
278  assert(CallbackDecl->isLambda());
279  FunctionDecl *callOperatorDecl = CallbackDecl->getLambdaCallOperator();
280  assert(callOperatorDecl != nullptr);
281 
282  DeclRefExpr *callOperatorDeclRef =
283  DeclRefExpr::Create(/* Ctx =*/ C,
284  /* QualifierLoc =*/ NestedNameSpecifierLoc(),
285  /* TemplateKWLoc =*/ SourceLocation(),
286  const_cast<FunctionDecl *>(callOperatorDecl),
287  /* RefersToEnclosingVariableOrCapture=*/ false,
288  /* NameLoc =*/ SourceLocation(),
289  /* T =*/ callOperatorDecl->getType(),
290  /* VK =*/ VK_LValue);
291 
293  /*AstContext=*/C, OO_Call, callOperatorDeclRef,
294  /*Args=*/CallArgs,
295  /*QualType=*/C.VoidTy,
296  /*ExprValueType=*/VK_RValue,
297  /*SourceLocation=*/SourceLocation(),
298  /*FPFeatures=*/FPOptionsOverride());
299 }
300 
301 /// Create a fake body for std::call_once.
302 /// Emulates the following function body:
303 ///
304 /// \code
305 /// typedef struct once_flag_s {
306 /// unsigned long __state = 0;
307 /// } once_flag;
308 /// template<class Callable>
309 /// void call_once(once_flag& o, Callable func) {
310 /// if (!o.__state) {
311 /// func();
312 /// }
313 /// o.__state = 1;
314 /// }
315 /// \endcode
317  LLVM_DEBUG(llvm::dbgs() << "Generating body for call_once\n");
318 
319  // We need at least two parameters.
320  if (D->param_size() < 2)
321  return nullptr;
322 
323  ASTMaker M(C);
324 
325  const ParmVarDecl *Flag = D->getParamDecl(0);
326  const ParmVarDecl *Callback = D->getParamDecl(1);
327 
328  if (!Callback->getType()->isReferenceType()) {
329  llvm::dbgs() << "libcxx03 std::call_once implementation, skipping.\n";
330  return nullptr;
331  }
332  if (!Flag->getType()->isReferenceType()) {
333  llvm::dbgs() << "unknown std::call_once implementation, skipping.\n";
334  return nullptr;
335  }
336 
337  QualType CallbackType = Callback->getType().getNonReferenceType();
338 
339  // Nullable pointer, non-null iff function is a CXXRecordDecl.
340  CXXRecordDecl *CallbackRecordDecl = CallbackType->getAsCXXRecordDecl();
341  QualType FlagType = Flag->getType().getNonReferenceType();
342  auto *FlagRecordDecl = FlagType->getAsRecordDecl();
343 
344  if (!FlagRecordDecl) {
345  LLVM_DEBUG(llvm::dbgs() << "Flag field is not a record: "
346  << "unknown std::call_once implementation, "
347  << "ignoring the call.\n");
348  return nullptr;
349  }
350 
351  // We initially assume libc++ implementation of call_once,
352  // where the once_flag struct has a field `__state_`.
353  ValueDecl *FlagFieldDecl = M.findMemberField(FlagRecordDecl, "__state_");
354 
355  // Otherwise, try libstdc++ implementation, with a field
356  // `_M_once`
357  if (!FlagFieldDecl) {
358  FlagFieldDecl = M.findMemberField(FlagRecordDecl, "_M_once");
359  }
360 
361  if (!FlagFieldDecl) {
362  LLVM_DEBUG(llvm::dbgs() << "No field _M_once or __state_ found on "
363  << "std::once_flag struct: unknown std::call_once "
364  << "implementation, ignoring the call.");
365  return nullptr;
366  }
367 
368  bool isLambdaCall = CallbackRecordDecl && CallbackRecordDecl->isLambda();
369  if (CallbackRecordDecl && !isLambdaCall) {
370  LLVM_DEBUG(llvm::dbgs()
371  << "Not supported: synthesizing body for functors when "
372  << "body farming std::call_once, ignoring the call.");
373  return nullptr;
374  }
375 
376  SmallVector<Expr *, 5> CallArgs;
377  const FunctionProtoType *CallbackFunctionType;
378  if (isLambdaCall) {
379 
380  // Lambda requires callback itself inserted as a first parameter.
381  CallArgs.push_back(
382  M.makeDeclRefExpr(Callback,
383  /* RefersToEnclosingVariableOrCapture=*/ true));
384  CallbackFunctionType = CallbackRecordDecl->getLambdaCallOperator()
385  ->getType()
387  } else if (!CallbackType->getPointeeType().isNull()) {
388  CallbackFunctionType =
389  CallbackType->getPointeeType()->getAs<FunctionProtoType>();
390  } else {
391  CallbackFunctionType = CallbackType->getAs<FunctionProtoType>();
392  }
393 
394  if (!CallbackFunctionType)
395  return nullptr;
396 
397  // First two arguments are used for the flag and for the callback.
398  if (D->getNumParams() != CallbackFunctionType->getNumParams() + 2) {
399  LLVM_DEBUG(llvm::dbgs() << "Types of params of the callback do not match "
400  << "params passed to std::call_once, "
401  << "ignoring the call\n");
402  return nullptr;
403  }
404 
405  // All arguments past first two ones are passed to the callback,
406  // and we turn lvalues into rvalues if the argument is not passed by
407  // reference.
408  for (unsigned int ParamIdx = 2; ParamIdx < D->getNumParams(); ParamIdx++) {
409  const ParmVarDecl *PDecl = D->getParamDecl(ParamIdx);
410  assert(PDecl);
411  if (CallbackFunctionType->getParamType(ParamIdx - 2)
413  .getCanonicalType() !=
415  LLVM_DEBUG(llvm::dbgs() << "Types of params of the callback do not match "
416  << "params passed to std::call_once, "
417  << "ignoring the call\n");
418  return nullptr;
419  }
420  Expr *ParamExpr = M.makeDeclRefExpr(PDecl);
421  if (!CallbackFunctionType->getParamType(ParamIdx - 2)->isReferenceType()) {
422  QualType PTy = PDecl->getType().getNonReferenceType();
423  ParamExpr = M.makeLvalueToRvalue(ParamExpr, PTy);
424  }
425  CallArgs.push_back(ParamExpr);
426  }
427 
428  CallExpr *CallbackCall;
429  if (isLambdaCall) {
430 
431  CallbackCall = create_call_once_lambda_call(C, M, Callback,
432  CallbackRecordDecl, CallArgs);
433  } else {
434 
435  // Function pointer case.
436  CallbackCall = create_call_once_funcptr_call(C, M, Callback, CallArgs);
437  }
438 
439  DeclRefExpr *FlagDecl =
440  M.makeDeclRefExpr(Flag,
441  /* RefersToEnclosingVariableOrCapture=*/true);
442 
443 
444  MemberExpr *Deref = M.makeMemberExpression(FlagDecl, FlagFieldDecl);
445  assert(Deref->isLValue());
446  QualType DerefType = Deref->getType();
447 
448  // Negation predicate.
450  C,
451  /* input=*/
452  M.makeImplicitCast(M.makeLvalueToRvalue(Deref, DerefType), DerefType,
453  CK_IntegralToBoolean),
454  /* opc=*/UO_LNot,
455  /* QualType=*/C.IntTy,
456  /* ExprValueKind=*/VK_RValue,
457  /* ExprObjectKind=*/OK_Ordinary, SourceLocation(),
458  /* CanOverflow*/ false, FPOptionsOverride());
459 
460  // Create assignment.
461  BinaryOperator *FlagAssignment = M.makeAssignment(
462  Deref, M.makeIntegralCast(M.makeIntegerLiteral(1, C.IntTy), DerefType),
463  DerefType);
464 
465  auto *Out =
467  /* IsConstexpr=*/false,
468  /* Init=*/nullptr,
469  /* Var=*/nullptr,
470  /* Cond=*/FlagCheck,
471  /* Then=*/M.makeCompound({CallbackCall, FlagAssignment}));
472 
473  return Out;
474 }
475 
476 /// Create a fake body for dispatch_once.
478  // Check if we have at least two parameters.
479  if (D->param_size() != 2)
480  return nullptr;
481 
482  // Check if the first parameter is a pointer to integer type.
483  const ParmVarDecl *Predicate = D->getParamDecl(0);
484  QualType PredicateQPtrTy = Predicate->getType();
485  const PointerType *PredicatePtrTy = PredicateQPtrTy->getAs<PointerType>();
486  if (!PredicatePtrTy)
487  return nullptr;
488  QualType PredicateTy = PredicatePtrTy->getPointeeType();
489  if (!PredicateTy->isIntegerType())
490  return nullptr;
491 
492  // Check if the second parameter is the proper block type.
493  const ParmVarDecl *Block = D->getParamDecl(1);
494  QualType Ty = Block->getType();
495  if (!isDispatchBlock(Ty))
496  return nullptr;
497 
498  // Everything checks out. Create a fakse body that checks the predicate,
499  // sets it, and calls the block. Basically, an AST dump of:
500  //
501  // void dispatch_once(dispatch_once_t *predicate, dispatch_block_t block) {
502  // if (*predicate != ~0l) {
503  // *predicate = ~0l;
504  // block();
505  // }
506  // }
507 
508  ASTMaker M(C);
509 
510  // (1) Create the call.
512  /*ASTContext=*/C,
513  /*StmtClass=*/M.makeLvalueToRvalue(/*Expr=*/Block),
514  /*Args=*/None,
515  /*QualType=*/C.VoidTy,
516  /*ExprValueType=*/VK_RValue,
517  /*SourceLocation=*/SourceLocation());
518 
519  // (2) Create the assignment to the predicate.
520  Expr *DoneValue =
521  UnaryOperator::Create(C, M.makeIntegerLiteral(0, C.LongTy), UO_Not,
523  /*CanOverflow*/ false, FPOptionsOverride());
524 
525  BinaryOperator *B =
526  M.makeAssignment(
527  M.makeDereference(
528  M.makeLvalueToRvalue(
529  M.makeDeclRefExpr(Predicate), PredicateQPtrTy),
530  PredicateTy),
531  M.makeIntegralCast(DoneValue, PredicateTy),
532  PredicateTy);
533 
534  // (3) Create the compound statement.
535  Stmt *Stmts[] = { B, CE };
536  CompoundStmt *CS = M.makeCompound(Stmts);
537 
538  // (4) Create the 'if' condition.
539  ImplicitCastExpr *LValToRval =
540  M.makeLvalueToRvalue(
541  M.makeDereference(
542  M.makeLvalueToRvalue(
543  M.makeDeclRefExpr(Predicate),
544  PredicateQPtrTy),
545  PredicateTy),
546  PredicateTy);
547 
548  Expr *GuardCondition = M.makeComparison(LValToRval, DoneValue, BO_NE);
549  // (5) Create the 'if' statement.
550  auto *If = IfStmt::Create(C, SourceLocation(),
551  /* IsConstexpr=*/false,
552  /* Init=*/nullptr,
553  /* Var=*/nullptr,
554  /* Cond=*/GuardCondition,
555  /* Then=*/CS);
556  return If;
557 }
558 
559 /// Create a fake body for dispatch_sync.
561  // Check if we have at least two parameters.
562  if (D->param_size() != 2)
563  return nullptr;
564 
565  // Check if the second parameter is a block.
566  const ParmVarDecl *PV = D->getParamDecl(1);
567  QualType Ty = PV->getType();
568  if (!isDispatchBlock(Ty))
569  return nullptr;
570 
571  // Everything checks out. Create a fake body that just calls the block.
572  // This is basically just an AST dump of:
573  //
574  // void dispatch_sync(dispatch_queue_t queue, void (^block)(void)) {
575  // block();
576  // }
577  //
578  ASTMaker M(C);
579  DeclRefExpr *DR = M.makeDeclRefExpr(PV);
580  ImplicitCastExpr *ICE = M.makeLvalueToRvalue(DR, Ty);
581  CallExpr *CE =
583  return CE;
584 }
585 
587 {
588  // There are exactly 3 arguments.
589  if (D->param_size() != 3)
590  return nullptr;
591 
592  // Signature:
593  // _Bool OSAtomicCompareAndSwapPtr(void *__oldValue,
594  // void *__newValue,
595  // void * volatile *__theValue)
596  // Generate body:
597  // if (oldValue == *theValue) {
598  // *theValue = newValue;
599  // return YES;
600  // }
601  // else return NO;
602 
603  QualType ResultTy = D->getReturnType();
604  bool isBoolean = ResultTy->isBooleanType();
605  if (!isBoolean && !ResultTy->isIntegralType(C))
606  return nullptr;
607 
608  const ParmVarDecl *OldValue = D->getParamDecl(0);
609  QualType OldValueTy = OldValue->getType();
610 
611  const ParmVarDecl *NewValue = D->getParamDecl(1);
612  QualType NewValueTy = NewValue->getType();
613 
614  assert(OldValueTy == NewValueTy);
615 
616  const ParmVarDecl *TheValue = D->getParamDecl(2);
617  QualType TheValueTy = TheValue->getType();
618  const PointerType *PT = TheValueTy->getAs<PointerType>();
619  if (!PT)
620  return nullptr;
621  QualType PointeeTy = PT->getPointeeType();
622 
623  ASTMaker M(C);
624  // Construct the comparison.
625  Expr *Comparison =
626  M.makeComparison(
627  M.makeLvalueToRvalue(M.makeDeclRefExpr(OldValue), OldValueTy),
628  M.makeLvalueToRvalue(
629  M.makeDereference(
630  M.makeLvalueToRvalue(M.makeDeclRefExpr(TheValue), TheValueTy),
631  PointeeTy),
632  PointeeTy),
633  BO_EQ);
634 
635  // Construct the body of the IfStmt.
636  Stmt *Stmts[2];
637  Stmts[0] =
638  M.makeAssignment(
639  M.makeDereference(
640  M.makeLvalueToRvalue(M.makeDeclRefExpr(TheValue), TheValueTy),
641  PointeeTy),
642  M.makeLvalueToRvalue(M.makeDeclRefExpr(NewValue), NewValueTy),
643  NewValueTy);
644 
645  Expr *BoolVal = M.makeObjCBool(true);
646  Expr *RetVal = isBoolean ? M.makeIntegralCastToBoolean(BoolVal)
647  : M.makeIntegralCast(BoolVal, ResultTy);
648  Stmts[1] = M.makeReturn(RetVal);
649  CompoundStmt *Body = M.makeCompound(Stmts);
650 
651  // Construct the else clause.
652  BoolVal = M.makeObjCBool(false);
653  RetVal = isBoolean ? M.makeIntegralCastToBoolean(BoolVal)
654  : M.makeIntegralCast(BoolVal, ResultTy);
655  Stmt *Else = M.makeReturn(RetVal);
656 
657  /// Construct the If.
658  auto *If = IfStmt::Create(C, SourceLocation(),
659  /* IsConstexpr=*/false,
660  /* Init=*/nullptr,
661  /* Var=*/nullptr, Comparison, Body,
662  SourceLocation(), Else);
663 
664  return If;
665 }
666 
668  Optional<Stmt *> &Val = Bodies[D];
669  if (Val.hasValue())
670  return Val.getValue();
671 
672  Val = nullptr;
673 
674  if (D->getIdentifier() == nullptr)
675  return nullptr;
676 
677  StringRef Name = D->getName();
678  if (Name.empty())
679  return nullptr;
680 
681  FunctionFarmer FF;
682 
683  if (Name.startswith("OSAtomicCompareAndSwap") ||
684  Name.startswith("objc_atomicCompareAndSwap")) {
686  } else if (Name == "call_once" && D->getDeclContext()->isStdNamespace()) {
687  FF = create_call_once;
688  } else {
689  FF = llvm::StringSwitch<FunctionFarmer>(Name)
690  .Case("dispatch_sync", create_dispatch_sync)
691  .Case("dispatch_once", create_dispatch_once)
692  .Default(nullptr);
693  }
694 
695  if (FF) { Val = FF(C, D); }
696  else if (Injector) { Val = Injector->getBody(D); }
697  return Val.getValue();
698 }
699 
700 static const ObjCIvarDecl *findBackingIvar(const ObjCPropertyDecl *Prop) {
701  const ObjCIvarDecl *IVar = Prop->getPropertyIvarDecl();
702 
703  if (IVar)
704  return IVar;
705 
706  // When a readonly property is shadowed in a class extensions with a
707  // a readwrite property, the instance variable belongs to the shadowing
708  // property rather than the shadowed property. If there is no instance
709  // variable on a readonly property, check to see whether the property is
710  // shadowed and if so try to get the instance variable from shadowing
711  // property.
712  if (!Prop->isReadOnly())
713  return nullptr;
714 
715  auto *Container = cast<ObjCContainerDecl>(Prop->getDeclContext());
716  const ObjCInterfaceDecl *PrimaryInterface = nullptr;
717  if (auto *InterfaceDecl = dyn_cast<ObjCInterfaceDecl>(Container)) {
718  PrimaryInterface = InterfaceDecl;
719  } else if (auto *CategoryDecl = dyn_cast<ObjCCategoryDecl>(Container)) {
720  PrimaryInterface = CategoryDecl->getClassInterface();
721  } else if (auto *ImplDecl = dyn_cast<ObjCImplDecl>(Container)) {
722  PrimaryInterface = ImplDecl->getClassInterface();
723  } else {
724  return nullptr;
725  }
726 
727  // FindPropertyVisibleInPrimaryClass() looks first in class extensions, so it
728  // is guaranteed to find the shadowing property, if it exists, rather than
729  // the shadowed property.
730  auto *ShadowingProp = PrimaryInterface->FindPropertyVisibleInPrimaryClass(
731  Prop->getIdentifier(), Prop->getQueryKind());
732  if (ShadowingProp && ShadowingProp != Prop) {
733  IVar = ShadowingProp->getPropertyIvarDecl();
734  }
735 
736  return IVar;
737 }
738 
740  const ObjCMethodDecl *MD) {
741  // First, find the backing ivar.
742  const ObjCIvarDecl *IVar = nullptr;
743 
744  // Property accessor stubs sometimes do not correspond to any property decl
745  // in the current interface (but in a superclass). They still have a
746  // corresponding property impl decl in this case.
747  if (MD->isSynthesizedAccessorStub()) {
748  const ObjCInterfaceDecl *IntD = MD->getClassInterface();
749  const ObjCImplementationDecl *ImpD = IntD->getImplementation();
750  for (const auto *PI: ImpD->property_impls()) {
751  if (const ObjCPropertyDecl *P = PI->getPropertyDecl()) {
752  if (P->getGetterName() == MD->getSelector())
753  IVar = P->getPropertyIvarDecl();
754  }
755  }
756  }
757 
758  if (!IVar) {
759  const ObjCPropertyDecl *Prop = MD->findPropertyDecl();
760  IVar = findBackingIvar(Prop);
761  if (!IVar)
762  return nullptr;
763 
764  // Ignore weak variables, which have special behavior.
766  return nullptr;
767 
768  // Look to see if Sema has synthesized a body for us. This happens in
769  // Objective-C++ because the return value may be a C++ class type with a
770  // non-trivial copy constructor. We can only do this if we can find the
771  // @synthesize for this property, though (or if we know it's been auto-
772  // synthesized).
773  const ObjCImplementationDecl *ImplDecl =
775  if (ImplDecl) {
776  for (const auto *I : ImplDecl->property_impls()) {
777  if (I->getPropertyDecl() != Prop)
778  continue;
779 
780  if (I->getGetterCXXConstructor()) {
781  ASTMaker M(Ctx);
782  return M.makeReturn(I->getGetterCXXConstructor());
783  }
784  }
785  }
786 
787  // Sanity check that the property is the same type as the ivar, or a
788  // reference to it, and that it is either an object pointer or trivially
789  // copyable.
790  if (!Ctx.hasSameUnqualifiedType(IVar->getType(),
791  Prop->getType().getNonReferenceType()))
792  return nullptr;
793  if (!IVar->getType()->isObjCLifetimeType() &&
794  !IVar->getType().isTriviallyCopyableType(Ctx))
795  return nullptr;
796  }
797 
798  // Generate our body:
799  // return self->_ivar;
800  ASTMaker M(Ctx);
801 
802  const VarDecl *selfVar = MD->getSelfDecl();
803  if (!selfVar)
804  return nullptr;
805 
806  Expr *loadedIVar =
807  M.makeObjCIvarRef(
808  M.makeLvalueToRvalue(
809  M.makeDeclRefExpr(selfVar),
810  selfVar->getType()),
811  IVar);
812 
813  if (!MD->getReturnType()->isReferenceType())
814  loadedIVar = M.makeLvalueToRvalue(loadedIVar, IVar->getType());
815 
816  return M.makeReturn(loadedIVar);
817 }
818 
820  // We currently only know how to synthesize property accessors.
821  if (!D->isPropertyAccessor())
822  return nullptr;
823 
824  D = D->getCanonicalDecl();
825 
826  // We should not try to synthesize explicitly redefined accessors.
827  // We do not know for sure how they behave.
828  if (!D->isImplicit())
829  return nullptr;
830 
831  Optional<Stmt *> &Val = Bodies[D];
832  if (Val.hasValue())
833  return Val.getValue();
834  Val = nullptr;
835 
836  // For now, we only synthesize getters.
837  // Synthesizing setters would cause false negatives in the
838  // RetainCountChecker because the method body would bind the parameter
839  // to an instance variable, causing it to escape. This would prevent
840  // warning in the following common scenario:
841  //
842  // id foo = [[NSObject alloc] init];
843  // self.foo = foo; // We should warn that foo leaks here.
844  //
845  if (D->param_size() != 0)
846  return nullptr;
847 
848  // If the property was defined in an extension, search the extensions for
849  // overrides.
850  const ObjCInterfaceDecl *OID = D->getClassInterface();
851  if (dyn_cast<ObjCInterfaceDecl>(D->getParent()) != OID)
852  for (auto *Ext : OID->known_extensions()) {
853  auto *OMD = Ext->getInstanceMethod(D->getSelector());
854  if (OMD && !OMD->isImplicit())
855  return nullptr;
856  }
857 
858  Val = createObjCPropertyGetter(C, D);
859 
860  return Val.getValue();
861 }
Defines the clang::ASTContext interface.
ObjCPropertyQueryKind getQueryKind() const
Definition: DeclObjC.h:872
Represents a function declaration or definition.
Definition: Decl.h:1783
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2645
QualType getPointeeType() const
Definition: Type.h:2655
A (possibly-)qualified type.
Definition: Type.h:655
unsigned param_size() const
Definition: DeclObjC.h:343
ObjCInterfaceDecl * getClassInterface()
Definition: DeclObjC.cpp:1156
Stmt - This represents one statement.
Definition: Stmt.h:68
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee...
Definition: Type.cpp:635
bool isLogicalOp() const
Definition: Expr.h:3765
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:89
StringRef P
static Stmt * create_call_once(ASTContext &C, const FunctionDecl *D)
Create a fake body for std::call_once.
Definition: BodyFarm.cpp:316
static CallExpr * create_call_once_funcptr_call(ASTContext &C, ASTMaker M, const ParmVarDecl *Callback, ArrayRef< Expr *> CallArgs)
Definition: BodyFarm.cpp:247
QualType getNonReferenceType() const
If Type is a reference type (e.g., const int&), returns the type that the reference refers to ("const...
Definition: Type.h:6598
The base class of the type hierarchy.
Definition: Type.h:1472
CanQualType LongTy
Definition: ASTContext.h:951
size_t param_size() const
Definition: Decl.h:2418
static bool isDispatchBlock(QualType Ty)
Definition: BodyFarm.cpp:35
Represents a variable declaration or definition.
Definition: Decl.h:820
QualType getReturnType() const
Definition: Decl.h:2456
unsigned getNumParams() const
Definition: Type.h:4096
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:7153
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:139
Represents a parameter to a function.
Definition: Decl.h:1595
Defines the clang::Expr interface and subclasses for C++ expressions.
IdentifierInfo * getIdentifier() const
Get the identifier that names this declaration, if there is one.
Definition: Decl.h:244
Represents a struct/union/class.
Definition: Decl.h:3764
DeclarationName getDeclName() const
Get the actual, stored name of the declaration, which may be a special name.
Definition: Decl.h:272
One of these records is kept for each identifier that is lexed.
static Stmt * createObjCPropertyGetter(ASTContext &Ctx, const ObjCMethodDecl *MD)
Definition: BodyFarm.cpp:739
QualType getPointeeType() const
Definition: Type.h:2737
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:174
A C++ nested-name-specifier augmented with source location information.
The results of name lookup within a DeclContext.
Definition: DeclBase.h:1223
bool isObjCLifetimeType() const
Returns true if objects of this type have lifetime semantics under ARC.
Definition: Type.cpp:4224
Defines the clang::CodeInjector interface which is responsible for injecting AST of function definiti...
bool isReferenceType() const
Definition: Type.h:6662
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:127
BinaryOperatorKind
static IfStmt * Create(const ASTContext &Ctx, SourceLocation IL, bool IsConstexpr, Stmt *Init, VarDecl *Var, Expr *Cond, Stmt *Then, SourceLocation EL=SourceLocation(), Stmt *Else=nullptr)
Create an IfStmt.
Definition: Stmt.cpp:863
static DeclAccessPair make(NamedDecl *D, AccessSpecifier AS)
bool isTriviallyCopyableType(const ASTContext &Context) const
Return true if this is a trivially copyable type (C++0x [basic.types]p9)
Definition: Type.cpp:2413
A builtin binary operation expression such as "x + y" or "x <= y".
Definition: Expr.h:3632
static CompoundStmt * Create(const ASTContext &C, ArrayRef< Stmt *> Stmts, SourceLocation LB, SourceLocation RB)
Definition: Stmt.cpp:318
bool isRValueReferenceType() const
Definition: Type.h:6670
bool isReadOnly() const
isReadOnly - Return true iff the property has a setter.
Definition: DeclObjC.h:848
bool isLambda() const
Determine whether this class describes a lambda function object.
Definition: DeclCXX.h:986
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:888
An ordinary object is located at an address in memory.
Definition: Specifiers.h:143
Represents an ObjC class declaration.
Definition: DeclObjC.h:1163
This is an odr-use.
Definition: Specifiers.h:167
QualType getReturnType() const
Definition: DeclObjC.h:325
Stmt *(* FunctionFarmer)(ASTContext &C, const FunctionDecl *D)
Definition: BodyFarm.cpp:245
ObjCMethodDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclObjC.cpp:958
static MemberExpr * Create(const ASTContext &C, Expr *Base, bool IsArrow, SourceLocation OperatorLoc, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, ValueDecl *MemberDecl, DeclAccessPair FoundDecl, DeclarationNameInfo MemberNameInfo, const TemplateArgumentListInfo *TemplateArgs, QualType T, ExprValueKind VK, ExprObjectKind OK, NonOdrUseReason NOUR)
Definition: Expr.cpp:1567
lookup_result lookup(DeclarationName Name) const
lookup - Find the declarations (if any) with the given Name in this context.
Definition: DeclBase.cpp:1659
RecordDecl * getAsRecordDecl() const
Retrieves the RecordDecl this type refers to.
Definition: Type.cpp:1770
CompoundStmt - This represents a group of statements like { stmt stmt }.
Definition: Stmt.h:1366
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1766
Represents a prototype with parameter type info, e.g.
Definition: Type.h:3886
CastKind
CastKind - The kind of operation required for a conversion.
static ImplicitCastExpr * Create(const ASTContext &Context, QualType T, CastKind Kind, Expr *Operand, const CXXCastPath *BasePath, ExprValueKind Cat)
Definition: Expr.cpp:1887
The FPOptions override type is value of the new FPOptions plus a mask showing which fields are actual...
Definition: LangOptions.h:458
static const ObjCIvarDecl * findBackingIvar(const ObjCPropertyDecl *Prop)
Definition: BodyFarm.cpp:700
A single parameter index whose accessors require each use to make explicit the parameter index encodi...
Definition: Attr.h:213
static CallExpr * Create(const ASTContext &Ctx, Expr *Fn, ArrayRef< Expr *> Args, QualType Ty, ExprValueKind VK, SourceLocation RParenLoc, unsigned MinNumArgs=0, ADLCallKind UsesADL=NotADL)
Create a call expression.
Definition: Expr.cpp:1344
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:619
This represents one expression.
Definition: Expr.h:110
known_extensions_range known_extensions() const
Definition: DeclObjC.h:1752
ExprValueKind
The categorization of expression values, currently following the C++11 scheme.
Definition: Specifiers.h:124
static BinaryOperator * Create(const ASTContext &C, Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, ExprValueKind VK, ExprObjectKind OK, SourceLocation opLoc, FPOptionsOverride FPFeatures)
Definition: Expr.cpp:4510
bool isImplicit() const
isImplicit - Indicates whether the declaration was implicitly generated by the implementation.
Definition: DeclBase.h:563
Defines an enumeration for C++ overloaded operators.
DeclContext * getDeclContext()
Definition: DeclBase.h:439
ObjCPropertyDecl * FindPropertyVisibleInPrimaryClass(IdentifierInfo *PropertyId, ObjCPropertyQueryKind QueryKind) const
FindPropertyVisibleInPrimaryClass - Finds declaration of the property with name &#39;PropertyId&#39; in the p...
Definition: DeclObjC.cpp:369
QualType getType() const
Definition: Expr.h:142
bool isFunctionOrMethod() const
Definition: DeclBase.h:1864
propimpl_range property_impls() const
Definition: DeclObjC.h:2458
DeclContext * getParent()
getParent - Returns the containing DeclContext.
Definition: DeclBase.h:1812
ReturnStmt - This represents a return, optionally of an expression: return; return 4;...
Definition: Stmt.h:2670
static Stmt * create_OSAtomicCompareAndSwap(ASTContext &C, const FunctionDecl *D)
Definition: BodyFarm.cpp:586
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:2119
Selector getSelector() const
Definition: DeclObjC.h:323
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:720
ImplicitParamDecl * getSelfDecl() const
Definition: DeclObjC.h:416
QualType getType() const
Definition: DeclObjC.h:814
bool isComparisonOp() const
Definition: Expr.h:3732
bool isSynthesizedAccessorStub() const
Definition: DeclObjC.h:442
QualType getCanonicalType() const
Definition: Type.h:6441
Encodes a location in the source.
QualType getReturnType() const
Definition: Type.h:3810
static Stmt * create_dispatch_sync(ASTContext &C, const FunctionDecl *D)
Create a fake body for dispatch_sync.
Definition: BodyFarm.cpp:560
static CallExpr * create_call_once_lambda_call(ASTContext &C, ASTMaker M, const ParmVarDecl *Callback, CXXRecordDecl *CallbackDecl, ArrayRef< Expr *> CallArgs)
Definition: BodyFarm.cpp:273
bool isIntegralType(const ASTContext &Ctx) const
Determine whether this type is an integral type.
Definition: Type.cpp:1928
bool isStdNamespace() const
Definition: DeclBase.cpp:1122
const ParmVarDecl * getParamDecl(unsigned i) const
Definition: Decl.h:2425
CanQualType VoidTy
Definition: ASTContext.h:942
llvm::APInt APInt
Definition: Integral.h:27
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:742
ImplicitCastExpr - Allows us to explicitly represent implicit type conversions, which have no direct ...
Definition: Expr.h:3472
bool isLValue() const
isLValue - True if this expression is an "l-value" according to the rules of the current language...
Definition: Expr.h:261
ObjCImplementationDecl * getImplementation() const
Definition: DeclObjC.cpp:1573
bool hasSameUnqualifiedType(QualType T1, QualType T2) const
Determine whether the given types are equivalent after cvr-qualifiers have been removed.
Definition: ASTContext.h:2299
A POD class for pairing a NamedDecl* with an access specifier.
static Stmt * create_dispatch_once(ASTContext &C, const FunctionDecl *D)
Create a fake body for dispatch_once.
Definition: BodyFarm.cpp:477
Dataflow Directional Tag Classes.
CXXMethodDecl * getLambdaCallOperator() const
Retrieve the lambda call operator of the closure type if this is a closure type.
Definition: DeclCXX.cpp:1465
static ReturnStmt * Create(const ASTContext &Ctx, SourceLocation RL, Expr *E, const VarDecl *NRVOCandidate)
Create a return statement.
Definition: Stmt.cpp:1092
The name of a declaration.
bool isBooleanType() const
Definition: Type.h:7045
Stmt * getBody(const FunctionDecl *D)
Factory method for creating bodies for ordinary functions.
Definition: BodyFarm.cpp:667
const ObjCInterfaceDecl * getContainingInterface() const
Return the class interface that this ivar is logically contained in; this is either the interface whe...
Definition: DeclObjC.cpp:1814
DeclarationNameInfo - A collector data type for bundling together a DeclarationName and the correspnd...
Pointer to a block type.
Definition: Type.h:2725
ObjCImplementationDecl - Represents a class definition - this is where method definitions are specifi...
Definition: DeclObjC.h:2543
bool isIntegerType() const
isIntegerType() does not include complex integers (a GCC extension).
Definition: Type.h:6961
static DeclRefExpr * Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, ValueDecl *D, bool RefersToEnclosingVariableOrCapture, SourceLocation NameLoc, QualType T, ExprValueKind VK, NamedDecl *FoundD=nullptr, const TemplateArgumentListInfo *TemplateArgs=nullptr, NonOdrUseReason NOUR=NOUR_None)
Definition: Expr.cpp:431
bool isFunctionType() const
Definition: Type.h:6646
APValue - This class implements a discriminated union of [uninitialized] [APSInt] [APFloat]...
Definition: APValue.h:115
ObjCIvarRefExpr - A reference to an ObjC instance variable.
Definition: ExprObjC.h:548
bool isLValueReferenceType() const
Definition: Type.h:6666
const ObjCPropertyDecl * findPropertyDecl(bool CheckOverrides=true) const
Returns the property associated with this method&#39;s selector.
Definition: DeclObjC.cpp:1314
QualType getParamType(unsigned i) const
Definition: Type.h:4098
MemberExpr - [C99 6.5.2.3] Structure and Union Members.
Definition: Expr.h:3050
Represents a C++ struct/union/class.
Definition: DeclCXX.h:254
bool isVoidType() const
Definition: Type.h:6933
static CXXOperatorCallExpr * Create(const ASTContext &Ctx, OverloadedOperatorKind OpKind, Expr *Fn, ArrayRef< Expr *> Args, QualType Ty, ExprValueKind VK, SourceLocation OperatorLoc, FPOptionsOverride FPFeatures, ADLCallKind UsesADL=NotADL)
Definition: ExprCXX.cpp:544
ObjCIvarDecl - Represents an ObjC instance variable.
Definition: DeclObjC.h:1936
ObjCIvarDecl * getPropertyIvarDecl() const
Definition: DeclObjC.h:936
ObjCPropertyAttribute::Kind getPropertyAttributes() const
Definition: DeclObjC.h:825
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2756
StringRef getName() const
Get the name of identifier for this declaration as a StringRef.
Definition: Decl.h:250
CanQualType IntTy
Definition: ASTContext.h:951
ObjCBoolLiteralExpr - Objective-C Boolean Literal.
Definition: ExprObjC.h:88
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1178
bool isPointerType() const
Definition: Type.h:6650
BasePaths - Represents the set of paths from a derived class to one of its (direct or indirect) bases...
QualType getType() const
Definition: Decl.h:630
An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:131
static UnaryOperator * Create(const ASTContext &C, Expr *input, Opcode opc, QualType type, ExprValueKind VK, ExprObjectKind OK, SourceLocation l, bool CanOverflow, FPOptionsOverride FPFeatures)
Definition: Expr.cpp:4565
This represents a decl that may have a name.
Definition: Decl.h:223
ObjCMethodDecl * getInstanceMethod(Selector Sel, bool AllowHidden=false) const
Definition: DeclObjC.h:1078
bool isPropertyAccessor() const
Definition: DeclObjC.h:434
unsigned getNumParams() const
Return the number of parameters this function must have based on its FunctionType.
Definition: Decl.cpp:3242
Comparison