clang  10.0.0git
CallEvent.cpp
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1 //===- CallEvent.cpp - Wrapper for all function and method calls ----------===//
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 /// \file This file defines CallEvent and its subclasses, which represent path-
10 /// sensitive instances of different kinds of function and method calls
11 /// (C, C++, and Objective-C).
12 //
13 //===----------------------------------------------------------------------===//
14 
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/Attr.h"
18 #include "clang/AST/Decl.h"
19 #include "clang/AST/DeclBase.h"
20 #include "clang/AST/DeclCXX.h"
21 #include "clang/AST/DeclObjC.h"
22 #include "clang/AST/Expr.h"
23 #include "clang/AST/ExprCXX.h"
24 #include "clang/AST/ExprObjC.h"
25 #include "clang/AST/ParentMap.h"
26 #include "clang/AST/Stmt.h"
27 #include "clang/AST/Type.h"
29 #include "clang/Analysis/CFG.h"
34 #include "clang/Basic/LLVM.h"
37 #include "clang/Basic/Specifiers.h"
48 #include "llvm/ADT/ArrayRef.h"
49 #include "llvm/ADT/DenseMap.h"
50 #include "llvm/ADT/None.h"
51 #include "llvm/ADT/Optional.h"
52 #include "llvm/ADT/PointerIntPair.h"
53 #include "llvm/ADT/SmallSet.h"
54 #include "llvm/ADT/SmallVector.h"
55 #include "llvm/ADT/StringExtras.h"
56 #include "llvm/ADT/StringRef.h"
57 #include "llvm/Support/Casting.h"
58 #include "llvm/Support/Compiler.h"
59 #include "llvm/Support/Debug.h"
60 #include "llvm/Support/ErrorHandling.h"
61 #include "llvm/Support/raw_ostream.h"
62 #include <cassert>
63 #include <utility>
64 
65 #define DEBUG_TYPE "static-analyzer-call-event"
66 
67 using namespace clang;
68 using namespace ento;
69 
71  ASTContext &Ctx = getState()->getStateManager().getContext();
72  const Expr *E = getOriginExpr();
73  if (!E)
74  return Ctx.VoidTy;
75  assert(E);
76 
77  QualType ResultTy = E->getType();
78 
79  // A function that returns a reference to 'int' will have a result type
80  // of simply 'int'. Check the origin expr's value kind to recover the
81  // proper type.
82  switch (E->getValueKind()) {
83  case VK_LValue:
84  ResultTy = Ctx.getLValueReferenceType(ResultTy);
85  break;
86  case VK_XValue:
87  ResultTy = Ctx.getRValueReferenceType(ResultTy);
88  break;
89  case VK_RValue:
90  // No adjustment is necessary.
91  break;
92  }
93 
94  return ResultTy;
95 }
96 
97 static bool isCallback(QualType T) {
98  // If a parameter is a block or a callback, assume it can modify pointer.
99  if (T->isBlockPointerType() ||
100  T->isFunctionPointerType() ||
101  T->isObjCSelType())
102  return true;
103 
104  // Check if a callback is passed inside a struct (for both, struct passed by
105  // reference and by value). Dig just one level into the struct for now.
106 
107  if (T->isAnyPointerType() || T->isReferenceType())
108  T = T->getPointeeType();
109 
110  if (const RecordType *RT = T->getAsStructureType()) {
111  const RecordDecl *RD = RT->getDecl();
112  for (const auto *I : RD->fields()) {
113  QualType FieldT = I->getType();
114  if (FieldT->isBlockPointerType() || FieldT->isFunctionPointerType())
115  return true;
116  }
117  }
118  return false;
119 }
120 
122  if (const auto *PT = T->getAs<PointerType>()) {
123  QualType PointeeTy = PT->getPointeeType();
124  if (PointeeTy.isConstQualified())
125  return false;
126  return PointeeTy->isVoidType();
127  } else
128  return false;
129 }
130 
131 bool CallEvent::hasNonNullArgumentsWithType(bool (*Condition)(QualType)) const {
132  unsigned NumOfArgs = getNumArgs();
133 
134  // If calling using a function pointer, assume the function does not
135  // satisfy the callback.
136  // TODO: We could check the types of the arguments here.
137  if (!getDecl())
138  return false;
139 
140  unsigned Idx = 0;
142  E = param_type_end();
143  I != E && Idx < NumOfArgs; ++I, ++Idx) {
144  // If the parameter is 0, it's harmless.
145  if (getArgSVal(Idx).isZeroConstant())
146  continue;
147 
148  if (Condition(*I))
149  return true;
150  }
151  return false;
152 }
153 
156 }
157 
160 }
161 
162 bool CallEvent::isGlobalCFunction(StringRef FunctionName) const {
163  const auto *FD = dyn_cast_or_null<FunctionDecl>(getDecl());
164  if (!FD)
165  return false;
166 
167  return CheckerContext::isCLibraryFunction(FD, FunctionName);
168 }
169 
171  const Decl *D = getDecl();
172  if (!D)
173  return nullptr;
174 
175  // TODO: For now we skip functions without definitions, even if we have
176  // our own getDecl(), because it's hard to find out which re-declaration
177  // is going to be used, and usually clients don't really care about this
178  // situation because there's a loss of precision anyway because we cannot
179  // inline the call.
181  if (!RD.getDecl())
182  return nullptr;
183 
184  AnalysisDeclContext *ADC =
186 
187  // TODO: For now we skip virtual functions, because this also rises
188  // the problem of which decl to use, but now it's across different classes.
189  if (RD.mayHaveOtherDefinitions() || RD.getDecl() != ADC->getDecl())
190  return nullptr;
191 
192  return ADC;
193 }
194 
195 const StackFrameContext *
196 CallEvent::getCalleeStackFrame(unsigned BlockCount) const {
198  if (!ADC)
199  return nullptr;
200 
201  const Expr *E = getOriginExpr();
202  if (!E)
203  return nullptr;
204 
205  // Recover CFG block via reverse lookup.
206  // TODO: If we were to keep CFG element information as part of the CallEvent
207  // instead of doing this reverse lookup, we would be able to build the stack
208  // frame for non-expression-based calls, and also we wouldn't need the reverse
209  // lookup.
211  const CFGBlock *B = Map->getBlock(E);
212  assert(B);
213 
214  // Also recover CFG index by scanning the CFG block.
215  unsigned Idx = 0, Sz = B->size();
216  for (; Idx < Sz; ++Idx)
217  if (auto StmtElem = (*B)[Idx].getAs<CFGStmt>())
218  if (StmtElem->getStmt() == E)
219  break;
220  assert(Idx < Sz);
221 
222  return ADC->getManager()->getStackFrame(ADC, LCtx, E, B, BlockCount, Idx);
223 }
224 
226  unsigned BlockCount) const {
227  const StackFrameContext *SFC = getCalleeStackFrame(BlockCount);
228  // We cannot construct a VarRegion without a stack frame.
229  if (!SFC)
230  return nullptr;
231 
232  // Retrieve parameters of the definition, which are different from
233  // CallEvent's parameters() because getDecl() isn't necessarily
234  // the definition. SFC contains the definition that would be used
235  // during analysis.
236  const Decl *D = SFC->getDecl();
237 
238  // TODO: Refactor into a virtual method of CallEvent, like parameters().
239  const ParmVarDecl *PVD = nullptr;
240  if (const auto *FD = dyn_cast<FunctionDecl>(D))
241  PVD = FD->parameters()[Index];
242  else if (const auto *BD = dyn_cast<BlockDecl>(D))
243  PVD = BD->parameters()[Index];
244  else if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
245  PVD = MD->parameters()[Index];
246  else if (const auto *CD = dyn_cast<CXXConstructorDecl>(D))
247  PVD = CD->parameters()[Index];
248  assert(PVD && "Unexpected Decl kind!");
249 
250  const VarRegion *VR =
251  State->getStateManager().getRegionManager().getVarRegion(PVD, SFC);
252 
253  // This sanity check would fail if our parameter declaration doesn't
254  // correspond to the stack frame's function declaration.
255  assert(VR->getStackFrame() == SFC);
256 
257  return VR;
258 }
259 
260 /// Returns true if a type is a pointer-to-const or reference-to-const
261 /// with no further indirection.
262 static bool isPointerToConst(QualType Ty) {
263  QualType PointeeTy = Ty->getPointeeType();
264  if (PointeeTy == QualType())
265  return false;
266  if (!PointeeTy.isConstQualified())
267  return false;
268  if (PointeeTy->isAnyPointerType())
269  return false;
270  return true;
271 }
272 
273 // Try to retrieve the function declaration and find the function parameter
274 // types which are pointers/references to a non-pointer const.
275 // We will not invalidate the corresponding argument regions.
276 static void findPtrToConstParams(llvm::SmallSet<unsigned, 4> &PreserveArgs,
277  const CallEvent &Call) {
278  unsigned Idx = 0;
279  for (CallEvent::param_type_iterator I = Call.param_type_begin(),
280  E = Call.param_type_end();
281  I != E; ++I, ++Idx) {
282  if (isPointerToConst(*I))
283  PreserveArgs.insert(Idx);
284  }
285 }
286 
288  ProgramStateRef Orig) const {
289  ProgramStateRef Result = (Orig ? Orig : getState());
290 
291  // Don't invalidate anything if the callee is marked pure/const.
292  if (const Decl *callee = getDecl())
293  if (callee->hasAttr<PureAttr>() || callee->hasAttr<ConstAttr>())
294  return Result;
295 
296  SmallVector<SVal, 8> ValuesToInvalidate;
298 
299  getExtraInvalidatedValues(ValuesToInvalidate, &ETraits);
300 
301  // Indexes of arguments whose values will be preserved by the call.
302  llvm::SmallSet<unsigned, 4> PreserveArgs;
303  if (!argumentsMayEscape())
304  findPtrToConstParams(PreserveArgs, *this);
305 
306  for (unsigned Idx = 0, Count = getNumArgs(); Idx != Count; ++Idx) {
307  // Mark this region for invalidation. We batch invalidate regions
308  // below for efficiency.
309  if (PreserveArgs.count(Idx))
310  if (const MemRegion *MR = getArgSVal(Idx).getAsRegion())
311  ETraits.setTrait(MR->getBaseRegion(),
313  // TODO: Factor this out + handle the lower level const pointers.
314 
315  ValuesToInvalidate.push_back(getArgSVal(Idx));
316 
317  // If a function accepts an object by argument (which would of course be a
318  // temporary that isn't lifetime-extended), invalidate the object itself,
319  // not only other objects reachable from it. This is necessary because the
320  // destructor has access to the temporary object after the call.
321  // TODO: Support placement arguments once we start
322  // constructing them directly.
323  // TODO: This is unnecessary when there's no destructor, but that's
324  // currently hard to figure out.
325  if (getKind() != CE_CXXAllocator)
327  if (auto AdjIdx = getAdjustedParameterIndex(Idx))
328  if (const VarRegion *VR = getParameterLocation(*AdjIdx, BlockCount))
329  ValuesToInvalidate.push_back(loc::MemRegionVal(VR));
330  }
331 
332  // Invalidate designated regions using the batch invalidation API.
333  // NOTE: Even if RegionsToInvalidate is empty, we may still invalidate
334  // global variables.
335  return Result->invalidateRegions(ValuesToInvalidate, getOriginExpr(),
336  BlockCount, getLocationContext(),
337  /*CausedByPointerEscape*/ true,
338  /*Symbols=*/nullptr, this, &ETraits);
339 }
340 
342  const ProgramPointTag *Tag) const {
343  if (const Expr *E = getOriginExpr()) {
344  if (IsPreVisit)
345  return PreStmt(E, getLocationContext(), Tag);
346  return PostStmt(E, getLocationContext(), Tag);
347  }
348 
349  const Decl *D = getDecl();
350  assert(D && "Cannot get a program point without a statement or decl");
351 
353  if (IsPreVisit)
354  return PreImplicitCall(D, Loc, getLocationContext(), Tag);
355  return PostImplicitCall(D, Loc, getLocationContext(), Tag);
356 }
357 
358 bool CallEvent::isCalled(const CallDescription &CD) const {
359  // FIXME: Add ObjC Message support.
360  if (getKind() == CE_ObjCMessage)
361  return false;
362 
363  const IdentifierInfo *II = getCalleeIdentifier();
364  if (!II)
365  return false;
366  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(getDecl());
367  if (!FD)
368  return false;
369 
370  if (CD.Flags & CDF_MaybeBuiltin) {
372  (!CD.RequiredArgs || CD.RequiredArgs <= getNumArgs()) &&
373  (!CD.RequiredParams || CD.RequiredParams <= parameters().size());
374  }
375 
376  if (!CD.IsLookupDone) {
377  CD.IsLookupDone = true;
378  CD.II = &getState()->getStateManager().getContext().Idents.get(
379  CD.getFunctionName());
380  }
381 
382  if (II != CD.II)
383  return false;
384 
385  // If CallDescription provides prefix names, use them to improve matching
386  // accuracy.
387  if (CD.QualifiedName.size() > 1 && FD) {
388  const DeclContext *Ctx = FD->getDeclContext();
389  // See if we'll be able to match them all.
390  size_t NumUnmatched = CD.QualifiedName.size() - 1;
391  for (; Ctx && isa<NamedDecl>(Ctx); Ctx = Ctx->getParent()) {
392  if (NumUnmatched == 0)
393  break;
394 
395  if (const auto *ND = dyn_cast<NamespaceDecl>(Ctx)) {
396  if (ND->getName() == CD.QualifiedName[NumUnmatched - 1])
397  --NumUnmatched;
398  continue;
399  }
400 
401  if (const auto *RD = dyn_cast<RecordDecl>(Ctx)) {
402  if (RD->getName() == CD.QualifiedName[NumUnmatched - 1])
403  --NumUnmatched;
404  continue;
405  }
406  }
407 
408  if (NumUnmatched > 0)
409  return false;
410  }
411 
412  return (!CD.RequiredArgs || CD.RequiredArgs == getNumArgs()) &&
413  (!CD.RequiredParams || CD.RequiredParams == parameters().size());
414 }
415 
416 SVal CallEvent::getArgSVal(unsigned Index) const {
417  const Expr *ArgE = getArgExpr(Index);
418  if (!ArgE)
419  return UnknownVal();
420  return getSVal(ArgE);
421 }
422 
424  const Expr *ArgE = getArgExpr(Index);
425  if (!ArgE)
426  return {};
427  return ArgE->getSourceRange();
428 }
429 
431  const Expr *E = getOriginExpr();
432  if (!E)
433  return UndefinedVal();
434  return getSVal(E);
435 }
436 
437 LLVM_DUMP_METHOD void CallEvent::dump() const { dump(llvm::errs()); }
438 
439 void CallEvent::dump(raw_ostream &Out) const {
440  ASTContext &Ctx = getState()->getStateManager().getContext();
441  if (const Expr *E = getOriginExpr()) {
442  E->printPretty(Out, nullptr, Ctx.getPrintingPolicy());
443  Out << "\n";
444  return;
445  }
446 
447  if (const Decl *D = getDecl()) {
448  Out << "Call to ";
449  D->print(Out, Ctx.getPrintingPolicy());
450  return;
451  }
452 
453  // FIXME: a string representation of the kind would be nice.
454  Out << "Unknown call (type " << getKind() << ")";
455 }
456 
457 bool CallEvent::isCallStmt(const Stmt *S) {
458  return isa<CallExpr>(S) || isa<ObjCMessageExpr>(S)
459  || isa<CXXConstructExpr>(S)
460  || isa<CXXNewExpr>(S);
461 }
462 
464  assert(D);
465  if (const auto *FD = dyn_cast<FunctionDecl>(D))
466  return FD->getReturnType();
467  if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
468  return MD->getReturnType();
469  if (const auto *BD = dyn_cast<BlockDecl>(D)) {
470  // Blocks are difficult because the return type may not be stored in the
471  // BlockDecl itself. The AST should probably be enhanced, but for now we
472  // just do what we can.
473  // If the block is declared without an explicit argument list, the
474  // signature-as-written just includes the return type, not the entire
475  // function type.
476  // FIXME: All blocks should have signatures-as-written, even if the return
477  // type is inferred. (That's signified with a dependent result type.)
478  if (const TypeSourceInfo *TSI = BD->getSignatureAsWritten()) {
479  QualType Ty = TSI->getType();
480  if (const FunctionType *FT = Ty->getAs<FunctionType>())
481  Ty = FT->getReturnType();
482  if (!Ty->isDependentType())
483  return Ty;
484  }
485 
486  return {};
487  }
488 
489  llvm_unreachable("unknown callable kind");
490 }
491 
492 bool CallEvent::isVariadic(const Decl *D) {
493  assert(D);
494 
495  if (const auto *FD = dyn_cast<FunctionDecl>(D))
496  return FD->isVariadic();
497  if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
498  return MD->isVariadic();
499  if (const auto *BD = dyn_cast<BlockDecl>(D))
500  return BD->isVariadic();
501 
502  llvm_unreachable("unknown callable kind");
503 }
504 
505 static void addParameterValuesToBindings(const StackFrameContext *CalleeCtx,
506  CallEvent::BindingsTy &Bindings,
507  SValBuilder &SVB,
508  const CallEvent &Call,
509  ArrayRef<ParmVarDecl*> parameters) {
510  MemRegionManager &MRMgr = SVB.getRegionManager();
511 
512  // If the function has fewer parameters than the call has arguments, we simply
513  // do not bind any values to them.
514  unsigned NumArgs = Call.getNumArgs();
515  unsigned Idx = 0;
516  ArrayRef<ParmVarDecl*>::iterator I = parameters.begin(), E = parameters.end();
517  for (; I != E && Idx < NumArgs; ++I, ++Idx) {
518  const ParmVarDecl *ParamDecl = *I;
519  assert(ParamDecl && "Formal parameter has no decl?");
520 
521  // TODO: Support allocator calls.
522  if (Call.getKind() != CE_CXXAllocator)
523  if (Call.isArgumentConstructedDirectly(Call.getASTArgumentIndex(Idx)))
524  continue;
525 
526  // TODO: Allocators should receive the correct size and possibly alignment,
527  // determined in compile-time but not represented as arg-expressions,
528  // which makes getArgSVal() fail and return UnknownVal.
529  SVal ArgVal = Call.getArgSVal(Idx);
530  if (!ArgVal.isUnknown()) {
531  Loc ParamLoc = SVB.makeLoc(MRMgr.getVarRegion(ParamDecl, CalleeCtx));
532  Bindings.push_back(std::make_pair(ParamLoc, ArgVal));
533  }
534  }
535 
536  // FIXME: Variadic arguments are not handled at all right now.
537 }
538 
540  const FunctionDecl *D = getDecl();
541  if (!D)
542  return None;
543  return D->parameters();
544 }
545 
547  const FunctionDecl *FD = getDecl();
548  if (!FD)
549  return {};
550 
551  // Note that the AnalysisDeclContext will have the FunctionDecl with
552  // the definition (if one exists).
553  AnalysisDeclContext *AD =
555  getManager()->getContext(FD);
556  bool IsAutosynthesized;
557  Stmt* Body = AD->getBody(IsAutosynthesized);
558  LLVM_DEBUG({
559  if (IsAutosynthesized)
560  llvm::dbgs() << "Using autosynthesized body for " << FD->getName()
561  << "\n";
562  });
563  if (Body) {
564  const Decl* Decl = AD->getDecl();
565  return RuntimeDefinition(Decl);
566  }
567 
568  SubEngine &Engine = getState()->getStateManager().getOwningEngine();
569  AnalyzerOptions &Opts = Engine.getAnalysisManager().options;
570 
571  // Try to get CTU definition only if CTUDir is provided.
572  if (!Opts.IsNaiveCTUEnabled)
573  return {};
574 
577  llvm::Expected<const FunctionDecl *> CTUDeclOrError =
578  CTUCtx.getCrossTUDefinition(FD, Opts.CTUDir, Opts.CTUIndexName,
579  Opts.DisplayCTUProgress);
580 
581  if (!CTUDeclOrError) {
582  handleAllErrors(CTUDeclOrError.takeError(),
583  [&](const cross_tu::IndexError &IE) {
584  CTUCtx.emitCrossTUDiagnostics(IE);
585  });
586  return {};
587  }
588 
589  return RuntimeDefinition(*CTUDeclOrError);
590 }
591 
593  const StackFrameContext *CalleeCtx,
594  BindingsTy &Bindings) const {
595  const auto *D = cast<FunctionDecl>(CalleeCtx->getDecl());
596  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
597  addParameterValuesToBindings(CalleeCtx, Bindings, SVB, *this,
598  D->parameters());
599 }
600 
603  return true;
604 
605  const FunctionDecl *D = getDecl();
606  if (!D)
607  return true;
608 
609  const IdentifierInfo *II = D->getIdentifier();
610  if (!II)
611  return false;
612 
613  // This set of "escaping" APIs is
614 
615  // - 'int pthread_setspecific(ptheread_key k, const void *)' stores a
616  // value into thread local storage. The value can later be retrieved with
617  // 'void *ptheread_getspecific(pthread_key)'. So even thought the
618  // parameter is 'const void *', the region escapes through the call.
619  if (II->isStr("pthread_setspecific"))
620  return true;
621 
622  // - xpc_connection_set_context stores a value which can be retrieved later
623  // with xpc_connection_get_context.
624  if (II->isStr("xpc_connection_set_context"))
625  return true;
626 
627  // - funopen - sets a buffer for future IO calls.
628  if (II->isStr("funopen"))
629  return true;
630 
631  // - __cxa_demangle - can reallocate memory and can return the pointer to
632  // the input buffer.
633  if (II->isStr("__cxa_demangle"))
634  return true;
635 
636  StringRef FName = II->getName();
637 
638  // - CoreFoundation functions that end with "NoCopy" can free a passed-in
639  // buffer even if it is const.
640  if (FName.endswith("NoCopy"))
641  return true;
642 
643  // - NSXXInsertXX, for example NSMapInsertIfAbsent, since they can
644  // be deallocated by NSMapRemove.
645  if (FName.startswith("NS") && (FName.find("Insert") != StringRef::npos))
646  return true;
647 
648  // - Many CF containers allow objects to escape through custom
649  // allocators/deallocators upon container construction. (PR12101)
650  if (FName.startswith("CF") || FName.startswith("CG")) {
651  return StrInStrNoCase(FName, "InsertValue") != StringRef::npos ||
652  StrInStrNoCase(FName, "AddValue") != StringRef::npos ||
653  StrInStrNoCase(FName, "SetValue") != StringRef::npos ||
654  StrInStrNoCase(FName, "WithData") != StringRef::npos ||
655  StrInStrNoCase(FName, "AppendValue") != StringRef::npos ||
656  StrInStrNoCase(FName, "SetAttribute") != StringRef::npos;
657  }
658 
659  return false;
660 }
661 
663  const FunctionDecl *D = getOriginExpr()->getDirectCallee();
664  if (D)
665  return D;
666 
667  return getSVal(getOriginExpr()->getCallee()).getAsFunctionDecl();
668 }
669 
671  const auto *CE = cast_or_null<CallExpr>(getOriginExpr());
672  if (!CE)
673  return AnyFunctionCall::getDecl();
674 
675  const FunctionDecl *D = CE->getDirectCallee();
676  if (D)
677  return D;
678 
679  return getSVal(CE->getCallee()).getAsFunctionDecl();
680 }
681 
683  ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const {
684  SVal ThisVal = getCXXThisVal();
685  Values.push_back(ThisVal);
686 
687  // Don't invalidate if the method is const and there are no mutable fields.
688  if (const auto *D = cast_or_null<CXXMethodDecl>(getDecl())) {
689  if (!D->isConst())
690  return;
691  // Get the record decl for the class of 'This'. D->getParent() may return a
692  // base class decl, rather than the class of the instance which needs to be
693  // checked for mutable fields.
694  // TODO: We might as well look at the dynamic type of the object.
695  const Expr *Ex = getCXXThisExpr()->ignoreParenBaseCasts();
696  QualType T = Ex->getType();
697  if (T->isPointerType()) // Arrow or implicit-this syntax?
698  T = T->getPointeeType();
699  const CXXRecordDecl *ParentRecord = T->getAsCXXRecordDecl();
700  assert(ParentRecord);
701  if (ParentRecord->hasMutableFields())
702  return;
703  // Preserve CXXThis.
704  const MemRegion *ThisRegion = ThisVal.getAsRegion();
705  if (!ThisRegion)
706  return;
707 
708  ETraits->setTrait(ThisRegion->getBaseRegion(),
710  }
711 }
712 
714  const Expr *Base = getCXXThisExpr();
715  // FIXME: This doesn't handle an overloaded ->* operator.
716  if (!Base)
717  return UnknownVal();
718 
719  SVal ThisVal = getSVal(Base);
720  assert(ThisVal.isUnknownOrUndef() || ThisVal.getAs<Loc>());
721  return ThisVal;
722 }
723 
724 RuntimeDefinition CXXInstanceCall::getRuntimeDefinition() const {
725  // Do we have a decl at all?
726  const Decl *D = getDecl();
727  if (!D)
728  return {};
729 
730  // If the method is non-virtual, we know we can inline it.
731  const auto *MD = cast<CXXMethodDecl>(D);
732  if (!MD->isVirtual())
734 
735  // Do we know the implicit 'this' object being called?
736  const MemRegion *R = getCXXThisVal().getAsRegion();
737  if (!R)
738  return {};
739 
740  // Do we know anything about the type of 'this'?
741  DynamicTypeInfo DynType = getDynamicTypeInfo(getState(), R);
742  if (!DynType.isValid())
743  return {};
744 
745  // Is the type a C++ class? (This is mostly a defensive check.)
746  QualType RegionType = DynType.getType()->getPointeeType();
747  assert(!RegionType.isNull() && "DynamicTypeInfo should always be a pointer.");
748 
749  const CXXRecordDecl *RD = RegionType->getAsCXXRecordDecl();
750  if (!RD || !RD->hasDefinition())
751  return {};
752 
753  // Find the decl for this method in that class.
754  const CXXMethodDecl *Result = MD->getCorrespondingMethodInClass(RD, true);
755  if (!Result) {
756  // We might not even get the original statically-resolved method due to
757  // some particularly nasty casting (e.g. casts to sister classes).
758  // However, we should at least be able to search up and down our own class
759  // hierarchy, and some real bugs have been caught by checking this.
760  assert(!RD->isDerivedFrom(MD->getParent()) && "Couldn't find known method");
761 
762  // FIXME: This is checking that our DynamicTypeInfo is at least as good as
763  // the static type. However, because we currently don't update
764  // DynamicTypeInfo when an object is cast, we can't actually be sure the
765  // DynamicTypeInfo is up to date. This assert should be re-enabled once
766  // this is fixed. <rdar://problem/12287087>
767  //assert(!MD->getParent()->isDerivedFrom(RD) && "Bad DynamicTypeInfo");
768 
769  return {};
770  }
771 
772  // Does the decl that we found have an implementation?
773  const FunctionDecl *Definition;
774  if (!Result->hasBody(Definition)) {
775  if (!DynType.canBeASubClass())
777  return {};
778  }
779 
780  // We found a definition. If we're not sure that this devirtualization is
781  // actually what will happen at runtime, make sure to provide the region so
782  // that ExprEngine can decide what to do with it.
783  if (DynType.canBeASubClass())
784  return RuntimeDefinition(Definition, R->StripCasts());
785  return RuntimeDefinition(Definition, /*DispatchRegion=*/nullptr);
786 }
787 
789  const StackFrameContext *CalleeCtx,
790  BindingsTy &Bindings) const {
792 
793  // Handle the binding of 'this' in the new stack frame.
794  SVal ThisVal = getCXXThisVal();
795  if (!ThisVal.isUnknown()) {
796  ProgramStateManager &StateMgr = getState()->getStateManager();
797  SValBuilder &SVB = StateMgr.getSValBuilder();
798 
799  const auto *MD = cast<CXXMethodDecl>(CalleeCtx->getDecl());
800  Loc ThisLoc = SVB.getCXXThis(MD, CalleeCtx);
801 
802  // If we devirtualized to a different member function, we need to make sure
803  // we have the proper layering of CXXBaseObjectRegions.
804  if (MD->getCanonicalDecl() != getDecl()->getCanonicalDecl()) {
805  ASTContext &Ctx = SVB.getContext();
806  const CXXRecordDecl *Class = MD->getParent();
807  QualType Ty = Ctx.getPointerType(Ctx.getRecordType(Class));
808 
809  // FIXME: CallEvent maybe shouldn't be directly accessing StoreManager.
810  bool Failed;
811  ThisVal = StateMgr.getStoreManager().attemptDownCast(ThisVal, Ty, Failed);
812  if (Failed) {
813  // We might have suffered some sort of placement new earlier, so
814  // we're constructing in a completely unexpected storage.
815  // Fall back to a generic pointer cast for this-value.
816  const CXXMethodDecl *StaticMD = cast<CXXMethodDecl>(getDecl());
817  const CXXRecordDecl *StaticClass = StaticMD->getParent();
818  QualType StaticTy = Ctx.getPointerType(Ctx.getRecordType(StaticClass));
819  ThisVal = SVB.evalCast(ThisVal, Ty, StaticTy);
820  }
821  }
822 
823  if (!ThisVal.isUnknown())
824  Bindings.push_back(std::make_pair(ThisLoc, ThisVal));
825  }
826 }
827 
829  return getOriginExpr()->getImplicitObjectArgument();
830 }
831 
832 RuntimeDefinition CXXMemberCall::getRuntimeDefinition() const {
833  // C++11 [expr.call]p1: ...If the selected function is non-virtual, or if the
834  // id-expression in the class member access expression is a qualified-id,
835  // that function is called. Otherwise, its final overrider in the dynamic type
836  // of the object expression is called.
837  if (const auto *ME = dyn_cast<MemberExpr>(getOriginExpr()->getCallee()))
838  if (ME->hasQualifier())
840 
842 }
843 
845  return getOriginExpr()->getArg(0);
846 }
847 
848 const BlockDataRegion *BlockCall::getBlockRegion() const {
849  const Expr *Callee = getOriginExpr()->getCallee();
850  const MemRegion *DataReg = getSVal(Callee).getAsRegion();
851 
852  return dyn_cast_or_null<BlockDataRegion>(DataReg);
853 }
854 
856  const BlockDecl *D = getDecl();
857  if (!D)
858  return None;
859  return D->parameters();
860 }
861 
863  RegionAndSymbolInvalidationTraits *ETraits) const {
864  // FIXME: This also needs to invalidate captured globals.
865  if (const MemRegion *R = getBlockRegion())
866  Values.push_back(loc::MemRegionVal(R));
867 }
868 
870  BindingsTy &Bindings) const {
871  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
872  ArrayRef<ParmVarDecl*> Params;
873  if (isConversionFromLambda()) {
874  auto *LambdaOperatorDecl = cast<CXXMethodDecl>(CalleeCtx->getDecl());
875  Params = LambdaOperatorDecl->parameters();
876 
877  // For blocks converted from a C++ lambda, the callee declaration is the
878  // operator() method on the lambda so we bind "this" to
879  // the lambda captured by the block.
880  const VarRegion *CapturedLambdaRegion = getRegionStoringCapturedLambda();
881  SVal ThisVal = loc::MemRegionVal(CapturedLambdaRegion);
882  Loc ThisLoc = SVB.getCXXThis(LambdaOperatorDecl, CalleeCtx);
883  Bindings.push_back(std::make_pair(ThisLoc, ThisVal));
884  } else {
885  Params = cast<BlockDecl>(CalleeCtx->getDecl())->parameters();
886  }
887 
888  addParameterValuesToBindings(CalleeCtx, Bindings, SVB, *this,
889  Params);
890 }
891 
893  if (Data)
894  return loc::MemRegionVal(static_cast<const MemRegion *>(Data));
895  return UnknownVal();
896 }
897 
899  RegionAndSymbolInvalidationTraits *ETraits) const {
900  if (Data) {
901  loc::MemRegionVal MV(static_cast<const MemRegion *>(Data));
902  if (SymbolRef Sym = MV.getAsSymbol(true))
903  ETraits->setTrait(Sym,
905  Values.push_back(MV);
906  }
907 }
908 
910  const StackFrameContext *CalleeCtx,
911  BindingsTy &Bindings) const {
913 
914  SVal ThisVal = getCXXThisVal();
915  if (!ThisVal.isUnknown()) {
916  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
917  const auto *MD = cast<CXXMethodDecl>(CalleeCtx->getDecl());
918  Loc ThisLoc = SVB.getCXXThis(MD, CalleeCtx);
919  Bindings.push_back(std::make_pair(ThisLoc, ThisVal));
920  }
921 }
922 
924  if (Data)
925  return loc::MemRegionVal(DtorDataTy::getFromOpaqueValue(Data).getPointer());
926  return UnknownVal();
927 }
928 
929 RuntimeDefinition CXXDestructorCall::getRuntimeDefinition() const {
930  // Base destructors are always called non-virtually.
931  // Skip CXXInstanceCall's devirtualization logic in this case.
932  if (isBaseDestructor())
934 
936 }
937 
939  const ObjCMethodDecl *D = getDecl();
940  if (!D)
941  return None;
942  return D->parameters();
943 }
944 
946  ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const {
947 
948  // If the method call is a setter for property known to be backed by
949  // an instance variable, don't invalidate the entire receiver, just
950  // the storage for that instance variable.
951  if (const ObjCPropertyDecl *PropDecl = getAccessedProperty()) {
952  if (const ObjCIvarDecl *PropIvar = PropDecl->getPropertyIvarDecl()) {
953  SVal IvarLVal = getState()->getLValue(PropIvar, getReceiverSVal());
954  if (const MemRegion *IvarRegion = IvarLVal.getAsRegion()) {
955  ETraits->setTrait(
956  IvarRegion,
958  ETraits->setTrait(
959  IvarRegion,
961  Values.push_back(IvarLVal);
962  }
963  return;
964  }
965  }
966 
967  Values.push_back(getReceiverSVal());
968 }
969 
971  const LocationContext *LCtx = getLocationContext();
972  const ImplicitParamDecl *SelfDecl = LCtx->getSelfDecl();
973  if (!SelfDecl)
974  return SVal();
975  return getState()->getSVal(getState()->getRegion(SelfDecl, LCtx));
976 }
977 
979  // FIXME: Is this the best way to handle class receivers?
980  if (!isInstanceMessage())
981  return UnknownVal();
982 
983  if (const Expr *RecE = getOriginExpr()->getInstanceReceiver())
984  return getSVal(RecE);
985 
986  // An instance message with no expression means we are sending to super.
987  // In this case the object reference is the same as 'self'.
988  assert(getOriginExpr()->getReceiverKind() == ObjCMessageExpr::SuperInstance);
989  SVal SelfVal = getSelfSVal();
990  assert(SelfVal.isValid() && "Calling super but not in ObjC method");
991  return SelfVal;
992 }
993 
995  if (getOriginExpr()->getReceiverKind() == ObjCMessageExpr::SuperInstance ||
996  getOriginExpr()->getReceiverKind() == ObjCMessageExpr::SuperClass)
997  return true;
998 
999  if (!isInstanceMessage())
1000  return false;
1001 
1002  SVal RecVal = getSVal(getOriginExpr()->getInstanceReceiver());
1003 
1004  return (RecVal == getSelfSVal());
1005 }
1006 
1008  switch (getMessageKind()) {
1009  case OCM_Message:
1010  return getOriginExpr()->getSourceRange();
1011  case OCM_PropertyAccess:
1012  case OCM_Subscript:
1013  return getContainingPseudoObjectExpr()->getSourceRange();
1014  }
1015  llvm_unreachable("unknown message kind");
1016 }
1017 
1018 using ObjCMessageDataTy = llvm::PointerIntPair<const PseudoObjectExpr *, 2>;
1019 
1020 const PseudoObjectExpr *ObjCMethodCall::getContainingPseudoObjectExpr() const {
1021  assert(Data && "Lazy lookup not yet performed.");
1022  assert(getMessageKind() != OCM_Message && "Explicit message send.");
1023  return ObjCMessageDataTy::getFromOpaqueValue(Data).getPointer();
1024 }
1025 
1026 static const Expr *
1028  const Expr *Syntactic = POE->getSyntacticForm();
1029 
1030  // This handles the funny case of assigning to the result of a getter.
1031  // This can happen if the getter returns a non-const reference.
1032  if (const auto *BO = dyn_cast<BinaryOperator>(Syntactic))
1033  Syntactic = BO->getLHS();
1034 
1035  return Syntactic;
1036 }
1037 
1039  if (!Data) {
1040  // Find the parent, ignoring implicit casts.
1041  const ParentMap &PM = getLocationContext()->getParentMap();
1042  const Stmt *S = PM.getParentIgnoreParenCasts(getOriginExpr());
1043 
1044  // Check if parent is a PseudoObjectExpr.
1045  if (const auto *POE = dyn_cast_or_null<PseudoObjectExpr>(S)) {
1046  const Expr *Syntactic = getSyntacticFromForPseudoObjectExpr(POE);
1047 
1048  ObjCMessageKind K;
1049  switch (Syntactic->getStmtClass()) {
1050  case Stmt::ObjCPropertyRefExprClass:
1051  K = OCM_PropertyAccess;
1052  break;
1053  case Stmt::ObjCSubscriptRefExprClass:
1054  K = OCM_Subscript;
1055  break;
1056  default:
1057  // FIXME: Can this ever happen?
1058  K = OCM_Message;
1059  break;
1060  }
1061 
1062  if (K != OCM_Message) {
1063  const_cast<ObjCMethodCall *>(this)->Data
1064  = ObjCMessageDataTy(POE, K).getOpaqueValue();
1065  assert(getMessageKind() == K);
1066  return K;
1067  }
1068  }
1069 
1070  const_cast<ObjCMethodCall *>(this)->Data
1071  = ObjCMessageDataTy(nullptr, 1).getOpaqueValue();
1072  assert(getMessageKind() == OCM_Message);
1073  return OCM_Message;
1074  }
1075 
1076  ObjCMessageDataTy Info = ObjCMessageDataTy::getFromOpaqueValue(Data);
1077  if (!Info.getPointer())
1078  return OCM_Message;
1079  return static_cast<ObjCMessageKind>(Info.getInt());
1080 }
1081 
1083  // Look for properties accessed with property syntax (foo.bar = ...)
1084  if (getMessageKind() == OCM_PropertyAccess) {
1085  const PseudoObjectExpr *POE = getContainingPseudoObjectExpr();
1086  assert(POE && "Property access without PseudoObjectExpr?");
1087 
1088  const Expr *Syntactic = getSyntacticFromForPseudoObjectExpr(POE);
1089  auto *RefExpr = cast<ObjCPropertyRefExpr>(Syntactic);
1090 
1091  if (RefExpr->isExplicitProperty())
1092  return RefExpr->getExplicitProperty();
1093  }
1094 
1095  // Look for properties accessed with method syntax ([foo setBar:...]).
1096  const ObjCMethodDecl *MD = getDecl();
1097  if (!MD || !MD->isPropertyAccessor())
1098  return nullptr;
1099 
1100  // Note: This is potentially quite slow.
1101  return MD->findPropertyDecl();
1102 }
1103 
1105  Selector Sel) const {
1106  assert(IDecl);
1107  AnalysisManager &AMgr =
1108  getState()->getStateManager().getOwningEngine().getAnalysisManager();
1109  // If the class interface is declared inside the main file, assume it is not
1110  // subcassed.
1111  // TODO: It could actually be subclassed if the subclass is private as well.
1112  // This is probably very rare.
1113  SourceLocation InterfLoc = IDecl->getEndOfDefinitionLoc();
1114  if (InterfLoc.isValid() && AMgr.isInCodeFile(InterfLoc))
1115  return false;
1116 
1117  // Assume that property accessors are not overridden.
1118  if (getMessageKind() == OCM_PropertyAccess)
1119  return false;
1120 
1121  // We assume that if the method is public (declared outside of main file) or
1122  // has a parent which publicly declares the method, the method could be
1123  // overridden in a subclass.
1124 
1125  // Find the first declaration in the class hierarchy that declares
1126  // the selector.
1127  ObjCMethodDecl *D = nullptr;
1128  while (true) {
1129  D = IDecl->lookupMethod(Sel, true);
1130 
1131  // Cannot find a public definition.
1132  if (!D)
1133  return false;
1134 
1135  // If outside the main file,
1136  if (D->getLocation().isValid() && !AMgr.isInCodeFile(D->getLocation()))
1137  return true;
1138 
1139  if (D->isOverriding()) {
1140  // Search in the superclass on the next iteration.
1141  IDecl = D->getClassInterface();
1142  if (!IDecl)
1143  return false;
1144 
1145  IDecl = IDecl->getSuperClass();
1146  if (!IDecl)
1147  return false;
1148 
1149  continue;
1150  }
1151 
1152  return false;
1153  };
1154 
1155  llvm_unreachable("The while loop should always terminate.");
1156 }
1157 
1159  if (!MD)
1160  return MD;
1161 
1162  // Find the redeclaration that defines the method.
1163  if (!MD->hasBody()) {
1164  for (auto I : MD->redecls())
1165  if (I->hasBody())
1166  MD = cast<ObjCMethodDecl>(I);
1167  }
1168  return MD;
1169 }
1170 
1171 static bool isCallToSelfClass(const ObjCMessageExpr *ME) {
1172  const Expr* InstRec = ME->getInstanceReceiver();
1173  if (!InstRec)
1174  return false;
1175  const auto *InstRecIg = dyn_cast<DeclRefExpr>(InstRec->IgnoreParenImpCasts());
1176 
1177  // Check that receiver is called 'self'.
1178  if (!InstRecIg || !InstRecIg->getFoundDecl() ||
1179  !InstRecIg->getFoundDecl()->getName().equals("self"))
1180  return false;
1181 
1182  // Check that the method name is 'class'.
1183  if (ME->getSelector().getNumArgs() != 0 ||
1184  !ME->getSelector().getNameForSlot(0).equals("class"))
1185  return false;
1186 
1187  return true;
1188 }
1189 
1190 RuntimeDefinition ObjCMethodCall::getRuntimeDefinition() const {
1191  const ObjCMessageExpr *E = getOriginExpr();
1192  assert(E);
1193  Selector Sel = E->getSelector();
1194 
1195  if (E->isInstanceMessage()) {
1196  // Find the receiver type.
1197  const ObjCObjectPointerType *ReceiverT = nullptr;
1198  bool CanBeSubClassed = false;
1199  QualType SupersType = E->getSuperType();
1200  const MemRegion *Receiver = nullptr;
1201 
1202  if (!SupersType.isNull()) {
1203  // The receiver is guaranteed to be 'super' in this case.
1204  // Super always means the type of immediate predecessor to the method
1205  // where the call occurs.
1206  ReceiverT = cast<ObjCObjectPointerType>(SupersType);
1207  } else {
1208  Receiver = getReceiverSVal().getAsRegion();
1209  if (!Receiver)
1210  return {};
1211 
1212  DynamicTypeInfo DTI = getDynamicTypeInfo(getState(), Receiver);
1213  if (!DTI.isValid()) {
1214  assert(isa<AllocaRegion>(Receiver) &&
1215  "Unhandled untyped region class!");
1216  return {};
1217  }
1218 
1219  QualType DynType = DTI.getType();
1220  CanBeSubClassed = DTI.canBeASubClass();
1221  ReceiverT = dyn_cast<ObjCObjectPointerType>(DynType.getCanonicalType());
1222 
1223  if (ReceiverT && CanBeSubClassed)
1224  if (ObjCInterfaceDecl *IDecl = ReceiverT->getInterfaceDecl())
1225  if (!canBeOverridenInSubclass(IDecl, Sel))
1226  CanBeSubClassed = false;
1227  }
1228 
1229  // Handle special cases of '[self classMethod]' and
1230  // '[[self class] classMethod]', which are treated by the compiler as
1231  // instance (not class) messages. We will statically dispatch to those.
1232  if (auto *PT = dyn_cast_or_null<ObjCObjectPointerType>(ReceiverT)) {
1233  // For [self classMethod], return the compiler visible declaration.
1234  if (PT->getObjectType()->isObjCClass() &&
1235  Receiver == getSelfSVal().getAsRegion())
1236  return RuntimeDefinition(findDefiningRedecl(E->getMethodDecl()));
1237 
1238  // Similarly, handle [[self class] classMethod].
1239  // TODO: We are currently doing a syntactic match for this pattern with is
1240  // limiting as the test cases in Analysis/inlining/InlineObjCClassMethod.m
1241  // shows. A better way would be to associate the meta type with the symbol
1242  // using the dynamic type info tracking and use it here. We can add a new
1243  // SVal for ObjC 'Class' values that know what interface declaration they
1244  // come from. Then 'self' in a class method would be filled in with
1245  // something meaningful in ObjCMethodCall::getReceiverSVal() and we could
1246  // do proper dynamic dispatch for class methods just like we do for
1247  // instance methods now.
1248  if (E->getInstanceReceiver())
1249  if (const auto *M = dyn_cast<ObjCMessageExpr>(E->getInstanceReceiver()))
1250  if (isCallToSelfClass(M))
1251  return RuntimeDefinition(findDefiningRedecl(E->getMethodDecl()));
1252  }
1253 
1254  // Lookup the instance method implementation.
1255  if (ReceiverT)
1256  if (ObjCInterfaceDecl *IDecl = ReceiverT->getInterfaceDecl()) {
1257  // Repeatedly calling lookupPrivateMethod() is expensive, especially
1258  // when in many cases it returns null. We cache the results so
1259  // that repeated queries on the same ObjCIntefaceDecl and Selector
1260  // don't incur the same cost. On some test cases, we can see the
1261  // same query being issued thousands of times.
1262  //
1263  // NOTE: This cache is essentially a "global" variable, but it
1264  // only gets lazily created when we get here. The value of the
1265  // cache probably comes from it being global across ExprEngines,
1266  // where the same queries may get issued. If we are worried about
1267  // concurrency, or possibly loading/unloading ASTs, etc., we may
1268  // need to revisit this someday. In terms of memory, this table
1269  // stays around until clang quits, which also may be bad if we
1270  // need to release memory.
1271  using PrivateMethodKey = std::pair<const ObjCInterfaceDecl *, Selector>;
1272  using PrivateMethodCache =
1273  llvm::DenseMap<PrivateMethodKey, Optional<const ObjCMethodDecl *>>;
1274 
1275  static PrivateMethodCache PMC;
1276  Optional<const ObjCMethodDecl *> &Val = PMC[std::make_pair(IDecl, Sel)];
1277 
1278  // Query lookupPrivateMethod() if the cache does not hit.
1279  if (!Val.hasValue()) {
1280  Val = IDecl->lookupPrivateMethod(Sel);
1281 
1282  // If the method is a property accessor, we should try to "inline" it
1283  // even if we don't actually have an implementation.
1284  if (!*Val)
1285  if (const ObjCMethodDecl *CompileTimeMD = E->getMethodDecl())
1286  if (CompileTimeMD->isPropertyAccessor()) {
1287  if (!CompileTimeMD->getSelfDecl() &&
1288  isa<ObjCCategoryDecl>(CompileTimeMD->getDeclContext())) {
1289  // If the method is an accessor in a category, and it doesn't
1290  // have a self declaration, first
1291  // try to find the method in a class extension. This
1292  // works around a bug in Sema where multiple accessors
1293  // are synthesized for properties in class
1294  // extensions that are redeclared in a category and the
1295  // the implicit parameters are not filled in for
1296  // the method on the category.
1297  // This ensures we find the accessor in the extension, which
1298  // has the implicit parameters filled in.
1299  auto *ID = CompileTimeMD->getClassInterface();
1300  for (auto *CatDecl : ID->visible_extensions()) {
1301  Val = CatDecl->getMethod(Sel,
1302  CompileTimeMD->isInstanceMethod());
1303  if (*Val)
1304  break;
1305  }
1306  }
1307  if (!*Val)
1308  Val = IDecl->lookupInstanceMethod(Sel);
1309  }
1310  }
1311 
1312  const ObjCMethodDecl *MD = Val.getValue();
1313  if (MD && !MD->hasBody())
1314  MD = MD->getCanonicalDecl();
1315  if (CanBeSubClassed)
1316  return RuntimeDefinition(MD, Receiver);
1317  else
1318  return RuntimeDefinition(MD, nullptr);
1319  }
1320  } else {
1321  // This is a class method.
1322  // If we have type info for the receiver class, we are calling via
1323  // class name.
1324  if (ObjCInterfaceDecl *IDecl = E->getReceiverInterface()) {
1325  // Find/Return the method implementation.
1326  return RuntimeDefinition(IDecl->lookupPrivateClassMethod(Sel));
1327  }
1328  }
1329 
1330  return {};
1331 }
1332 
1334  if (isInSystemHeader() && !isInstanceMessage()) {
1335  Selector Sel = getSelector();
1336  if (Sel.getNumArgs() == 1 &&
1337  Sel.getIdentifierInfoForSlot(0)->isStr("valueWithPointer"))
1338  return true;
1339  }
1340 
1342 }
1343 
1345  const StackFrameContext *CalleeCtx,
1346  BindingsTy &Bindings) const {
1347  const auto *D = cast<ObjCMethodDecl>(CalleeCtx->getDecl());
1348  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
1349  addParameterValuesToBindings(CalleeCtx, Bindings, SVB, *this,
1350  D->parameters());
1351 
1352  SVal SelfVal = getReceiverSVal();
1353  if (!SelfVal.isUnknown()) {
1354  const VarDecl *SelfD = CalleeCtx->getAnalysisDeclContext()->getSelfDecl();
1355  MemRegionManager &MRMgr = SVB.getRegionManager();
1356  Loc SelfLoc = SVB.makeLoc(MRMgr.getVarRegion(SelfD, CalleeCtx));
1357  Bindings.push_back(std::make_pair(SelfLoc, SelfVal));
1358  }
1359 }
1360 
1361 CallEventRef<>
1363  const LocationContext *LCtx) {
1364  if (const auto *MCE = dyn_cast<CXXMemberCallExpr>(CE))
1365  return create<CXXMemberCall>(MCE, State, LCtx);
1366 
1367  if (const auto *OpCE = dyn_cast<CXXOperatorCallExpr>(CE)) {
1368  const FunctionDecl *DirectCallee = OpCE->getDirectCallee();
1369  if (const auto *MD = dyn_cast<CXXMethodDecl>(DirectCallee))
1370  if (MD->isInstance())
1371  return create<CXXMemberOperatorCall>(OpCE, State, LCtx);
1372 
1373  } else if (CE->getCallee()->getType()->isBlockPointerType()) {
1374  return create<BlockCall>(CE, State, LCtx);
1375  }
1376 
1377  // Otherwise, it's a normal function call, static member function call, or
1378  // something we can't reason about.
1379  return create<SimpleFunctionCall>(CE, State, LCtx);
1380 }
1381 
1382 CallEventRef<>
1384  ProgramStateRef State) {
1385  const LocationContext *ParentCtx = CalleeCtx->getParent();
1386  const LocationContext *CallerCtx = ParentCtx->getStackFrame();
1387  assert(CallerCtx && "This should not be used for top-level stack frames");
1388 
1389  const Stmt *CallSite = CalleeCtx->getCallSite();
1390 
1391  if (CallSite) {
1392  if (CallEventRef<> Out = getCall(CallSite, State, CallerCtx))
1393  return Out;
1394 
1395  // All other cases are handled by getCall.
1396  assert(isa<CXXConstructExpr>(CallSite) &&
1397  "This is not an inlineable statement");
1398 
1399  SValBuilder &SVB = State->getStateManager().getSValBuilder();
1400  const auto *Ctor = cast<CXXMethodDecl>(CalleeCtx->getDecl());
1401  Loc ThisPtr = SVB.getCXXThis(Ctor, CalleeCtx);
1402  SVal ThisVal = State->getSVal(ThisPtr);
1403 
1404  return getCXXConstructorCall(cast<CXXConstructExpr>(CallSite),
1405  ThisVal.getAsRegion(), State, CallerCtx);
1406  }
1407 
1408  // Fall back to the CFG. The only thing we haven't handled yet is
1409  // destructors, though this could change in the future.
1410  const CFGBlock *B = CalleeCtx->getCallSiteBlock();
1411  CFGElement E = (*B)[CalleeCtx->getIndex()];
1412  assert((E.getAs<CFGImplicitDtor>() || E.getAs<CFGTemporaryDtor>()) &&
1413  "All other CFG elements should have exprs");
1414 
1415  SValBuilder &SVB = State->getStateManager().getSValBuilder();
1416  const auto *Dtor = cast<CXXDestructorDecl>(CalleeCtx->getDecl());
1417  Loc ThisPtr = SVB.getCXXThis(Dtor, CalleeCtx);
1418  SVal ThisVal = State->getSVal(ThisPtr);
1419 
1420  const Stmt *Trigger;
1422  Trigger = AutoDtor->getTriggerStmt();
1423  else if (Optional<CFGDeleteDtor> DeleteDtor = E.getAs<CFGDeleteDtor>())
1424  Trigger = DeleteDtor->getDeleteExpr();
1425  else
1426  Trigger = Dtor->getBody();
1427 
1428  return getCXXDestructorCall(Dtor, Trigger, ThisVal.getAsRegion(),
1429  E.getAs<CFGBaseDtor>().hasValue(), State,
1430  CallerCtx);
1431 }
1432 
1433 CallEventRef<> CallEventManager::getCall(const Stmt *S, ProgramStateRef State,
1434  const LocationContext *LC) {
1435  if (const auto *CE = dyn_cast<CallExpr>(S)) {
1436  return getSimpleCall(CE, State, LC);
1437  } else if (const auto *NE = dyn_cast<CXXNewExpr>(S)) {
1438  return getCXXAllocatorCall(NE, State, LC);
1439  } else if (const auto *ME = dyn_cast<ObjCMessageExpr>(S)) {
1440  return getObjCMethodCall(ME, State, LC);
1441  } else {
1442  return nullptr;
1443  }
1444 }
The receiver is the instance of the superclass object.
Definition: ExprObjC.h:1107
Defines the clang::ASTContext interface.
SVal getSelfSVal() const
Return the value of &#39;self&#39; if available.
Definition: CallEvent.cpp:970
SVal getReceiverSVal() const
Returns the value of the receiver at the time of this call.
Definition: CallEvent.cpp:978
void getExtraInvalidatedValues(ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const override
Definition: CallEvent.cpp:898
Represents a function declaration or definition.
Definition: Decl.h:1783
Expr * getSyntacticForm()
Return the syntactic form of this expression, i.e.
Definition: Expr.h:5759
Smart pointer class that efficiently represents Objective-C method names.
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2614
A (possibly-)qualified type.
Definition: Type.h:654
MemRegion - The root abstract class for all memory regions.
Definition: MemRegion.h:94
bool isBlockPointerType() const
Definition: Type.h:6512
bool argumentsMayEscape() const override
Returns true if any of the arguments are known to escape to long- term storage, even if this method w...
Definition: CallEvent.cpp:601
Selector getSelector() const
Definition: ExprObjC.cpp:337
ObjCInterfaceDecl * getClassInterface()
Definition: DeclObjC.cpp:1155
Stmt * getBody() const
Get the body of the Declaration.
static const Expr * getSyntacticFromForPseudoObjectExpr(const PseudoObjectExpr *POE)
Definition: CallEvent.cpp:1027
Stmt - This represents one statement.
Definition: Stmt.h:66
Information about invalidation for a particular region/symbol.
Definition: MemRegion.h:1445
ProgramPoint getProgramPoint(bool IsPreVisit=false, const ProgramPointTag *Tag=nullptr) const
Returns an appropriate ProgramPoint for this call.
Definition: CallEvent.cpp:341
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3422
static bool isCallToSelfClass(const ObjCMessageExpr *ME)
Definition: CallEvent.cpp:1171
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee...
Definition: Type.cpp:557
C Language Family Type Representation.
Defines the SourceManager interface.
ObjCInterfaceDecl * getReceiverInterface() const
Retrieve the Objective-C interface to which this message is being directed, if known.
Definition: ExprObjC.cpp:358
AnalysisDeclContext * getCalleeAnalysisDeclContext() const
Returns AnalysisDeclContext for the callee stack frame.
Definition: CallEvent.cpp:170
QualType getLValueReferenceType(QualType T, bool SpelledAsLValue=true) const
Return the uniqued reference to the type for an lvalue reference to the specified type...
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:88
const RecordType * getAsStructureType() const
Definition: Type.cpp:573
IntrusiveRefCntPtr< const ProgramState > ProgramStateRef
StringRef getFunctionName() const
Get the name of the function that this object matches.
Definition: CallEvent.h:1105
Represents C++ object destructor generated from a call to delete.
Definition: CFG.h:414
SourceRange getSourceRange() const override
Definition: CallEvent.cpp:1007
Represents a program point just before an implicit call event.
Definition: ProgramPoint.h:583
A container of type source information.
Definition: Type.h:6227
const StackFrameContext * getCalleeStackFrame(unsigned BlockCount) const
Returns the callee stack frame.
Definition: CallEvent.cpp:196
CallEventRef getSimpleCall(const CallExpr *E, ProgramStateRef State, const LocationContext *LCtx)
Definition: CallEvent.cpp:1362
virtual RuntimeDefinition getRuntimeDefinition() const =0
Returns the definition of the function or method that will be called.
void getInitialStackFrameContents(const StackFrameContext *CalleeCtx, BindingsTy &Bindings) const override
Definition: CallEvent.cpp:788
Expr * ignoreParenBaseCasts() LLVM_READONLY
Skip past any parentheses and derived-to-base casts until reaching a fixed point. ...
Definition: Expr.cpp:3017
bool isOverriding() const
Whether this method overrides any other in the class hierarchy.
Definition: DeclObjC.h:459
const Expr * getOriginExpr() const
Returns the expression whose value will be the result of this call.
Definition: CallEvent.h:222
Represents a variable declaration or definition.
Definition: Decl.h:820
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:7002
void setTrait(SymbolRef Sym, InvalidationKinds IK)
Definition: MemRegion.cpp:1585
SVal getSVal(const Stmt *S) const
Get the value of arbitrary expressions at this point in the path.
Definition: CallEvent.h:182
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:138
static bool isVoidPointerToNonConst(QualType T)
Definition: CallEvent.cpp:121
const Expr * getCXXThisExpr() const override
Returns the expression representing the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:844
ArrayRef< ParmVarDecl * > parameters() const override
Return call&#39;s formal parameters.
Definition: CallEvent.cpp:539
Represents a parameter to a function.
Definition: Decl.h:1595
Defines the clang::Expr interface and subclasses for C++ expressions.
void getExtraInvalidatedValues(ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const override
Definition: CallEvent.cpp:862
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:3748
const StackFrameContext * getStackFrame(AnalysisDeclContext *Ctx, const LocationContext *Parent, const Stmt *S, const CFGBlock *Blk, unsigned BlockCount, unsigned Idx)
One of these records is kept for each identifier that is lexed.
RuntimeDefinition getRuntimeDefinition() const override
Definition: CallEvent.cpp:832
const SymExpr * SymbolRef
Definition: SymExpr.h:110
param_type_iterator param_type_end() const
Definition: CallEvent.h:450
bool isStr(const char(&Str)[StrLen]) const
Return true if this is the identifier for the specified string.
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:168
field_range fields() const
Definition: Decl.h:3963
AnalysisDeclContext contains the context data for the function or method under analysis.
Represents C++ object destructor implicitly generated for automatic object or temporary bound to cons...
Definition: CFG.h:389
bool isReferenceType() const
Definition: Type.h:6516
virtual const Expr * getArgExpr(unsigned Index) const
Returns the expression associated with a given argument.
Definition: CallEvent.h:272
bool isObjCSelType() const
Definition: Type.h:6663
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:125
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:2399
static void addParameterValuesToBindings(const StackFrameContext *CalleeCtx, CallEvent::BindingsTy &Bindings, SValBuilder &SVB, const CallEvent &Call, ArrayRef< ParmVarDecl *> parameters)
Definition: CallEvent.cpp:505
This class represents a description of a function call using the number of arguments and the name of ...
Definition: CallEvent.h:1058
Represents any expression that calls an Objective-C method.
Definition: CallEvent.h:938
virtual Kind getKind() const =0
Returns the kind of call this is.
const ImplicitParamDecl * getSelfDecl() const
bool hasNonZeroCallbackArg() const
Returns true if any of the arguments appear to represent callbacks.
Definition: CallEvent.cpp:154
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified...
An x-value expression is a reference to an object with independent storage but which can be "moved"...
Definition: Specifiers.h:134
ExprValueKind getValueKind() const
getValueKind - The value kind that this expression produces.
Definition: Expr.h:414
static void findPtrToConstParams(llvm::SmallSet< unsigned, 4 > &PreserveArgs, const CallEvent &Call)
Definition: CallEvent.cpp:276
const clang::PrintingPolicy & getPrintingPolicy() const
Definition: ASTContext.h:671
const LocationContext * getParent() const
static bool isPointerToConst(QualType Ty)
Returns true if a type is a pointer-to-const or reference-to-const with no further indirection...
Definition: CallEvent.cpp:262
static const ObjCMethodDecl * findDefiningRedecl(const ObjCMethodDecl *MD)
Definition: CallEvent.cpp:1158
SVal getReturnValue() const
Returns the return value of the call.
Definition: CallEvent.cpp:430
unsigned size() const
Definition: CFG.h:918
const FunctionDecl * getDecl() const override
Returns the declaration of the function or method that will be called.
Definition: CallEvent.h:474
param_type_iterator param_type_begin() const
Returns an iterator over the types of the call&#39;s formal parameters.
Definition: CallEvent.h:446
Represents an ObjC class declaration.
Definition: DeclObjC.h:1186
static bool isVariadic(const Decl *D)
Returns true if the given decl is known to be variadic.
Definition: CallEvent.cpp:492
virtual Decl * getCanonicalDecl()
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclBase.h:877
ObjCMethodDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclObjC.cpp:957
virtual ArrayRef< ParmVarDecl * > parameters() const =0
Return call&#39;s formal parameters.
const CFGBlock * getCallSiteBlock() const
SmallVectorImpl< FrameBindingTy > BindingsTy
Definition: CallEvent.h:351
const Expr * getCXXThisExpr() const override
Returns the expression representing the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:828
ObjCMessageKind
Represents the ways an Objective-C message send can occur.
Definition: CallEvent.h:929
bool isReceiverSelfOrSuper() const
Checks if the receiver refers to &#39;self&#39; or &#39;super&#39;.
Definition: CallEvent.cpp:994
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1690
const Stmt * getCallSite() const
ArrayRef< ParmVarDecl * > parameters() const override
Definition: CallEvent.cpp:938
Represents a single basic block in a source-level CFG.
Definition: CFG.h:576
bool argumentsMayEscape() const override
Definition: CallEvent.cpp:1333
ArrayRef< ParmVarDecl * > parameters() const override
Definition: CallEvent.cpp:855
AnalysisDeclContext * getContext(const Decl *D)
const LocationContext * getLocationContext() const
The context in which the call is being evaluated.
Definition: CallEvent.h:212
static bool isCallback(QualType T)
Definition: CallEvent.cpp:97
Represents a block literal declaration, which is like an unnamed FunctionDecl.
Definition: Decl.h:4037
This represents one expression.
Definition: Expr.h:108
void getInitialStackFrameContents(const StackFrameContext *CalleeCtx, BindingsTy &Bindings) const override
Definition: CallEvent.cpp:1344
const FunctionDecl * getDecl() const override
Returns the declaration of the function or method that will be called.
Definition: CallEvent.cpp:662
CFGBlock * getBlock(Stmt *S)
Returns the CFGBlock the specified Stmt* appears in.
Definition: CFGStmtMap.cpp:26
CallEventRef getCaller(const StackFrameContext *CalleeCtx, ProgramStateRef State)
Gets an outside caller given a callee context.
Definition: CallEvent.cpp:1383
static bool isCLibraryFunction(const FunctionDecl *FD, StringRef Name=StringRef())
Returns true if the callee is an externally-visible function in the top-level namespace, such as malloc.
Expr * getCallee()
Definition: Expr.h:2663
llvm::mapped_iterator< ArrayRef< ParmVarDecl * >::iterator, GetTypeFn > param_type_iterator
Definition: CallEvent.h:439
bool isInSystemHeader() const
Returns true if the callee is known to be from a system header.
Definition: CallEvent.h:234
StringRef getNameForSlot(unsigned argIndex) const
Retrieve the name at a given position in the selector.
DeclContext * getDeclContext()
Definition: DeclBase.h:438
ObjCInterfaceDecl * getSuperClass() const
Definition: DeclObjC.cpp:337
virtual SVal getCXXThisVal() const
Returns the value of the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:713
const IdentifierInfo * getCalleeIdentifier() const
Returns the name of the callee, if its name is a simple identifier.
Definition: CallEvent.h:332
void getInitialStackFrameContents(const StackFrameContext *CalleeCtx, BindingsTy &Bindings) const override
Definition: CallEvent.cpp:869
bool hasBody(const FunctionDecl *&Definition) const
Returns true if the function has a body.
Definition: Decl.cpp:2859
Defines the clang::IdentifierInfo, clang::IdentifierTable, and clang::Selector interfaces.
QualType getType() const
Definition: Expr.h:137
virtual const Decl * getDecl() const
Returns the declaration of the function or method that will be called.
Definition: CallEvent.h:202
DeclContext * getParent()
getParent - Returns the containing DeclContext.
Definition: DeclBase.h:1784
An expression that sends a message to the given Objective-C object or class.
Definition: ExprObjC.h:950
virtual cross_tu::CrossTranslationUnitContext * getCrossTranslationUnitContext()=0
QualType getRecordType(const RecordDecl *Decl) const
unsigned getNumArgs() const
void getExtraInvalidatedValues(ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const override
Definition: CallEvent.cpp:945
Represents C++ object destructor implicitly generated for base object in destructor.
Definition: CFG.h:440
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:719
virtual bool argumentsMayEscape() const
Returns true if any of the arguments are known to escape to long- term storage, even if this method w...
Definition: CallEvent.h:303
RuntimeDefinition getRuntimeDefinition() const override
Definition: CallEvent.cpp:724
bool isConstQualified() const
Determine whether this type is const-qualified.
Definition: Type.h:6315
virtual SourceRange getSourceRange() const
Returns a source range for the entire call, suitable for outputting in diagnostics.
Definition: CallEvent.h:263
void getInitialStackFrameContents(const StackFrameContext *CalleeCtx, BindingsTy &Bindings) const override
Populates the given SmallVector with the bindings in the callee&#39;s stack frame at the start of this ca...
Definition: CallEvent.cpp:592
const ImplicitParamDecl * getSelfDecl() const
Return the ImplicitParamDecl* associated with &#39;self&#39; if this AnalysisDeclContext wraps an ObjCMethodD...
Defines the runtime definition of the called function.
Definition: CallEvent.h:101
QualType getCanonicalType() const
Definition: Type.h:6295
PseudoObjectExpr - An expression which accesses a pseudo-object l-value.
Definition: Expr.h:5715
IdentifierInfo * getIdentifierInfoForSlot(unsigned argIndex) const
Retrieve the identifier at a given position in the selector.
void getExtraInvalidatedValues(ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const override
Definition: CallEvent.cpp:682
Encodes a location in the source.
const FunctionDecl * getDecl() const override
Definition: CallEvent.cpp:670
static bool isCallStmt(const Stmt *S)
Returns true if this is a statement is a function or method call of some kind.
Definition: CallEvent.cpp:457
ProgramPoints can be "tagged" as representing points specific to a given analysis entity...
Definition: ProgramPoint.h:39
const MemRegion * getAsRegion() const
Definition: SVals.cpp:151
bool isArgumentConstructedDirectly(unsigned Index) const
Returns true if on the current path, the argument was constructed by calling a C++ constructor over i...
Definition: CallEvent.h:402
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:1931
SVal - This represents a symbolic expression, which can be either an L-value or an R-value...
Definition: SVals.h:75
CanQualType VoidTy
Definition: ASTContext.h:1016
const StackFrameContext * getStackFrame() const
Definition: MemRegion.cpp:157
const Decl * getDecl() const
bool isAnyPointerType() const
Definition: Type.h:6508
virtual Optional< unsigned > getAdjustedParameterIndex(unsigned ASTArgumentIndex) const
Some calls have parameter numbering mismatched from argument numbering.
Definition: CallEvent.h:413
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:741
RuntimeDefinition getRuntimeDefinition() const override
Definition: CallEvent.cpp:929
const ObjCMethodDecl * getMethodDecl() const
Definition: ExprObjC.h:1356
Tells that a region&#39;s contents is not changed.
Definition: MemRegion.h:1460
virtual void getExtraInvalidatedValues(ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const
Used to specify non-argument regions that will be invalidated as a result of this call...
Definition: CallEvent.h:190
Optional< T > getAs() const
Convert to the specified CFGElement type, returning None if this CFGElement is not of the desired typ...
Definition: CFG.h:109
Defines various enumerations that describe declaration and type specifiers.
CallEventRef getCall(const Stmt *S, ProgramStateRef State, const LocationContext *LC)
Gets a call event for a function call, Objective-C method call, or a &#39;new&#39; call.
Definition: CallEvent.cpp:1433
StringRef getName() const
Return the actual identifier string.
Expr * getInstanceReceiver()
Returns the object expression (receiver) for an instance message, or null for a message that is not a...
Definition: ExprObjC.h:1260
redecl_range redecls() const
Returns an iterator range for all the redeclarations of the same decl.
Definition: DeclBase.h:948
SVal getCXXThisVal() const
Returns the value of the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:892
Dataflow Directional Tag Classes.
virtual bool canBeOverridenInSubclass(ObjCInterfaceDecl *IDecl, Selector Sel) const
Check if the selector may have multiple definitions (may have overrides).
Definition: CallEvent.cpp:1104
const BlockDataRegion * getBlockRegion() const
Returns the region associated with this instance of the block.
Definition: CallEvent.cpp:848
AnalysisDeclContextManager * getManager() const
Return the AnalysisDeclContextManager (if any) that created this AnalysisDeclContext.
bool isValid() const
Return true if this is a valid SourceLocation object.
virtual SourceRange getArgSourceRange(unsigned Index) const
Returns the source range for errors associated with this argument.
Definition: CallEvent.cpp:423
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1271
Represents a program point just after an implicit call event.
Definition: ProgramPoint.h:600
RuntimeDefinition getRuntimeDefinition() const override
Definition: CallEvent.cpp:1190
bool NE(InterpState &S, CodePtr OpPC)
Definition: Interp.h:223
QualType getSuperType() const
Retrieve the type referred to by &#39;super&#39;.
Definition: ExprObjC.h:1336
StmtClass getStmtClass() const
Definition: Stmt.h:1109
bool hasVoidPointerToNonConstArg() const
Returns true if any of the arguments is void*.
Definition: CallEvent.cpp:158
const CXXRecordDecl * getParent() const
Return the parent of this method declaration, which is the class in which this method is defined...
Definition: DeclCXX.h:2046
Describes a C standard function that is sometimes implemented as a macro that expands to a compiler b...
Definition: CallEvent.h:1053
bool mayHaveOtherDefinitions()
Check if the definition we have is precise.
Definition: CallEvent.h:122
ObjCMessageKind getMessageKind() const
Returns how the message was written in the source (property access, subscript, or explicit message se...
Definition: CallEvent.cpp:1038
This class is used for tools that requires cross translation unit capability.
const Decl * getDecl() const
Expr * IgnoreParenImpCasts() LLVM_READONLY
Skip past any parentheses and implicit casts which might surround this expression until reaching a fi...
Definition: Expr.cpp:2995
Represents a pointer to an Objective C object.
Definition: Type.h:5951
const FunctionDecl * getAsFunctionDecl() const
getAsFunctionDecl - If this SVal is a MemRegionVal and wraps a CodeTextRegion wrapping a FunctionDecl...
Definition: SVals.cpp:63
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4495
ObjCInterfaceDecl * getInterfaceDecl() const
If this pointer points to an Objective @interface type, gets the declaration for that interface...
Definition: Type.h:6007
bool hasBody() const override
Determine whether this method has a body.
Definition: DeclObjC.h:516
static QualType getDeclaredResultType(const Decl *D)
Returns the result type of a function or method declaration.
Definition: CallEvent.cpp:463
DynamicTypeInfo getDynamicTypeInfo(ProgramStateRef State, const MemRegion *MR)
Get dynamic type information for the region MR.
Definition: DynamicType.cpp:40
const StackFrameContext * getStackFrame() const
bool isGlobalCFunction(StringRef SpecificName=StringRef()) const
Returns true if the callee is an externally-visible function in the top-level namespace, such as malloc.
Definition: CallEvent.cpp:162
ObjCMethodDecl * lookupMethod(Selector Sel, bool isInstance, bool shallowCategoryLookup=false, bool followSuper=true, const ObjCCategoryDecl *C=nullptr) const
lookupMethod - This method returns an instance/class method by looking in the class, its categories, and its super classes (using a linear search).
Definition: DeclObjC.cpp:682
Stores options for the analyzer from the command line.
llvm::Expected< const FunctionDecl * > getCrossTUDefinition(const FunctionDecl *FD, StringRef CrossTUDir, StringRef IndexName, bool DisplayCTUProgress=false)
This function loads a function or variable definition from an external AST file and merges it into th...
QualType getResultType() const
Returns the result type, adjusted for references.
Definition: CallEvent.cpp:70
bool hasMutableFields() const
Determine whether this class, or any of its class subobjects, contains a mutable field.
Definition: DeclCXX.h:1136
const ObjCPropertyDecl * findPropertyDecl(bool CheckOverrides=true) const
Returns the property associated with this method&#39;s selector.
Definition: DeclObjC.cpp:1313
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate.h) and friends (in DeclFriend.h).
bool hasNonNullArgumentsWithType(bool(*Condition)(QualType)) const
Returns true if the type of any of the non-null arguments satisfies the condition.
Definition: CallEvent.cpp:131
const ProgramStateRef & getState() const
The state in which the call is being evaluated.
Definition: CallEvent.h:207
Defines the clang::SourceLocation class and associated facilities.
Represents a C++ struct/union/class.
Definition: DeclCXX.h:253
QualType getRValueReferenceType(QualType T) const
Return the uniqued reference to the type for an rvalue reference to the specified type...
bool isVoidType() const
Definition: Type.h:6777
SVal getCXXThisVal() const override
Returns the value of the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:923
Represents C++ object destructor implicitly generated by compiler on various occasions.
Definition: CFG.h:364
bool isCalled(const CallDescription &CD) const
Returns true if the CallEvent is a call to a function that matches the CallDescription.
Definition: CallEvent.cpp:358
const ParentMap & getParentMap() const
ObjCIvarDecl - Represents an ObjC instance variable.
Definition: DeclObjC.h:1959
virtual unsigned getNumArgs() const =0
Returns the number of arguments (explicit and implicit).
Represents a top-level expression in a basic block.
Definition: CFG.h:55
llvm::PointerIntPair< const PseudoObjectExpr *, 2 > ObjCMessageDataTy
Definition: CallEvent.cpp:1018
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:263
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2546
void emitCrossTUDiagnostics(const IndexError &IE)
Emit diagnostics for the user for potential configuration errors.
StringRef getName() const
Get the name of identifier for this declaration as a StringRef.
Definition: Decl.h:250
const ObjCPropertyDecl * getAccessedProperty() const
Definition: CallEvent.cpp:1082
Stmt * getParentIgnoreParenCasts(Stmt *) const
Definition: ParentMap.cpp:145
ProgramStateRef invalidateRegions(unsigned BlockCount, ProgramStateRef Orig=nullptr) const
Returns a new state with all argument regions invalidated.
Definition: CallEvent.cpp:287
bool isDependentType() const
Whether this type is a dependent type, meaning that its definition somehow depends on a template para...
Definition: Type.h:2150
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1171
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:4123
bool isPointerType() const
Definition: Type.h:6504
virtual SVal getArgSVal(unsigned Index) const
Returns the value of a given argument at the time of the call.
Definition: CallEvent.cpp:416
const VarRegion * getParameterLocation(unsigned Index, unsigned BlockCount) const
Returns memory location for a parameter variable within the callee stack frame.
Definition: CallEvent.cpp:225
An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:129
const void * Data
Definition: CallEvent.h:149
A trivial tuple used to represent a source range.
bool isPropertyAccessor() const
Definition: DeclObjC.h:433
AnalysisDeclContext * getAnalysisDeclContext() const
SourceLocation getEndOfDefinitionLoc() const
Definition: DeclObjC.h:1892
bool isFunctionPointerType() const
Definition: Type.h:6538
The receiver is a superclass.
Definition: ExprObjC.h:1104
bool isInstanceMessage() const
Determine whether this is an instance message to either a computed object or to super.
Definition: ExprObjC.h:1248
SourceLocation getBegin() const
Represents C++ object destructor implicitly generated at the end of full expression for temporary obj...
Definition: CFG.h:482
RuntimeDefinition getRuntimeDefinition() const override
Returns the definition of the function or method that will be called.
Definition: CallEvent.cpp:546
SourceLocation getLocation() const
Definition: DeclBase.h:429
ArrayRef< ParmVarDecl * > parameters() const
Definition: DeclObjC.h:368
void getInitialStackFrameContents(const StackFrameContext *CalleeCtx, BindingsTy &Bindings) const override
Definition: CallEvent.cpp:909
ArrayRef< SVal > ValueList
virtual AnalysisManager & getAnalysisManager()=0