clang  10.0.0svn
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/Decl.h"
18 #include "clang/AST/DeclBase.h"
19 #include "clang/AST/DeclCXX.h"
20 #include "clang/AST/DeclObjC.h"
21 #include "clang/AST/Expr.h"
22 #include "clang/AST/ExprCXX.h"
23 #include "clang/AST/ExprObjC.h"
24 #include "clang/AST/ParentMap.h"
25 #include "clang/AST/Stmt.h"
26 #include "clang/AST/Type.h"
28 #include "clang/Analysis/CFG.h"
33 #include "clang/Basic/LLVM.h"
36 #include "clang/Basic/Specifiers.h"
47 #include "llvm/ADT/ArrayRef.h"
48 #include "llvm/ADT/DenseMap.h"
49 #include "llvm/ADT/None.h"
50 #include "llvm/ADT/Optional.h"
51 #include "llvm/ADT/PointerIntPair.h"
52 #include "llvm/ADT/SmallSet.h"
53 #include "llvm/ADT/SmallVector.h"
54 #include "llvm/ADT/StringExtras.h"
55 #include "llvm/ADT/StringRef.h"
56 #include "llvm/Support/Casting.h"
57 #include "llvm/Support/Compiler.h"
58 #include "llvm/Support/Debug.h"
59 #include "llvm/Support/ErrorHandling.h"
60 #include "llvm/Support/raw_ostream.h"
61 #include <cassert>
62 #include <utility>
63 
64 #define DEBUG_TYPE "static-analyzer-call-event"
65 
66 using namespace clang;
67 using namespace ento;
68 
70  ASTContext &Ctx = getState()->getStateManager().getContext();
71  const Expr *E = getOriginExpr();
72  if (!E)
73  return Ctx.VoidTy;
74  assert(E);
75 
76  QualType ResultTy = E->getType();
77 
78  // A function that returns a reference to 'int' will have a result type
79  // of simply 'int'. Check the origin expr's value kind to recover the
80  // proper type.
81  switch (E->getValueKind()) {
82  case VK_LValue:
83  ResultTy = Ctx.getLValueReferenceType(ResultTy);
84  break;
85  case VK_XValue:
86  ResultTy = Ctx.getRValueReferenceType(ResultTy);
87  break;
88  case VK_RValue:
89  // No adjustment is necessary.
90  break;
91  }
92 
93  return ResultTy;
94 }
95 
96 static bool isCallback(QualType T) {
97  // If a parameter is a block or a callback, assume it can modify pointer.
98  if (T->isBlockPointerType() ||
99  T->isFunctionPointerType() ||
100  T->isObjCSelType())
101  return true;
102 
103  // Check if a callback is passed inside a struct (for both, struct passed by
104  // reference and by value). Dig just one level into the struct for now.
105 
106  if (T->isAnyPointerType() || T->isReferenceType())
107  T = T->getPointeeType();
108 
109  if (const RecordType *RT = T->getAsStructureType()) {
110  const RecordDecl *RD = RT->getDecl();
111  for (const auto *I : RD->fields()) {
112  QualType FieldT = I->getType();
113  if (FieldT->isBlockPointerType() || FieldT->isFunctionPointerType())
114  return true;
115  }
116  }
117  return false;
118 }
119 
121  if (const auto *PT = T->getAs<PointerType>()) {
122  QualType PointeeTy = PT->getPointeeType();
123  if (PointeeTy.isConstQualified())
124  return false;
125  return PointeeTy->isVoidType();
126  } else
127  return false;
128 }
129 
130 bool CallEvent::hasNonNullArgumentsWithType(bool (*Condition)(QualType)) const {
131  unsigned NumOfArgs = getNumArgs();
132 
133  // If calling using a function pointer, assume the function does not
134  // satisfy the callback.
135  // TODO: We could check the types of the arguments here.
136  if (!getDecl())
137  return false;
138 
139  unsigned Idx = 0;
141  E = param_type_end();
142  I != E && Idx < NumOfArgs; ++I, ++Idx) {
143  // If the parameter is 0, it's harmless.
144  if (getArgSVal(Idx).isZeroConstant())
145  continue;
146 
147  if (Condition(*I))
148  return true;
149  }
150  return false;
151 }
152 
155 }
156 
159 }
160 
161 bool CallEvent::isGlobalCFunction(StringRef FunctionName) const {
162  const auto *FD = dyn_cast_or_null<FunctionDecl>(getDecl());
163  if (!FD)
164  return false;
165 
166  return CheckerContext::isCLibraryFunction(FD, FunctionName);
167 }
168 
170  const Decl *D = getDecl();
171  if (!D)
172  return nullptr;
173 
174  // TODO: For now we skip functions without definitions, even if we have
175  // our own getDecl(), because it's hard to find out which re-declaration
176  // is going to be used, and usually clients don't really care about this
177  // situation because there's a loss of precision anyway because we cannot
178  // inline the call.
180  if (!RD.getDecl())
181  return nullptr;
182 
183  AnalysisDeclContext *ADC =
185 
186  // TODO: For now we skip virtual functions, because this also rises
187  // the problem of which decl to use, but now it's across different classes.
188  if (RD.mayHaveOtherDefinitions() || RD.getDecl() != ADC->getDecl())
189  return nullptr;
190 
191  return ADC;
192 }
193 
196  if (!ADC)
197  return nullptr;
198 
199  const Expr *E = getOriginExpr();
200  if (!E)
201  return nullptr;
202 
203  // Recover CFG block via reverse lookup.
204  // TODO: If we were to keep CFG element information as part of the CallEvent
205  // instead of doing this reverse lookup, we would be able to build the stack
206  // frame for non-expression-based calls, and also we wouldn't need the reverse
207  // lookup.
209  const CFGBlock *B = Map->getBlock(E);
210  assert(B);
211 
212  // Also recover CFG index by scanning the CFG block.
213  unsigned Idx = 0, Sz = B->size();
214  for (; Idx < Sz; ++Idx)
215  if (auto StmtElem = (*B)[Idx].getAs<CFGStmt>())
216  if (StmtElem->getStmt() == E)
217  break;
218  assert(Idx < Sz);
219 
220  return ADC->getManager()->getStackFrame(ADC, LCtx, E, B, Idx);
221 }
222 
223 const VarRegion *CallEvent::getParameterLocation(unsigned Index) const {
224  const StackFrameContext *SFC = getCalleeStackFrame();
225  // We cannot construct a VarRegion without a stack frame.
226  if (!SFC)
227  return nullptr;
228 
229  // Retrieve parameters of the definition, which are different from
230  // CallEvent's parameters() because getDecl() isn't necessarily
231  // the definition. SFC contains the definition that would be used
232  // during analysis.
233  const Decl *D = SFC->getDecl();
234 
235  // TODO: Refactor into a virtual method of CallEvent, like parameters().
236  const ParmVarDecl *PVD = nullptr;
237  if (const auto *FD = dyn_cast<FunctionDecl>(D))
238  PVD = FD->parameters()[Index];
239  else if (const auto *BD = dyn_cast<BlockDecl>(D))
240  PVD = BD->parameters()[Index];
241  else if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
242  PVD = MD->parameters()[Index];
243  else if (const auto *CD = dyn_cast<CXXConstructorDecl>(D))
244  PVD = CD->parameters()[Index];
245  assert(PVD && "Unexpected Decl kind!");
246 
247  const VarRegion *VR =
248  State->getStateManager().getRegionManager().getVarRegion(PVD, SFC);
249 
250  // This sanity check would fail if our parameter declaration doesn't
251  // correspond to the stack frame's function declaration.
252  assert(VR->getStackFrame() == SFC);
253 
254  return VR;
255 }
256 
257 /// Returns true if a type is a pointer-to-const or reference-to-const
258 /// with no further indirection.
259 static bool isPointerToConst(QualType Ty) {
260  QualType PointeeTy = Ty->getPointeeType();
261  if (PointeeTy == QualType())
262  return false;
263  if (!PointeeTy.isConstQualified())
264  return false;
265  if (PointeeTy->isAnyPointerType())
266  return false;
267  return true;
268 }
269 
270 // Try to retrieve the function declaration and find the function parameter
271 // types which are pointers/references to a non-pointer const.
272 // We will not invalidate the corresponding argument regions.
273 static void findPtrToConstParams(llvm::SmallSet<unsigned, 4> &PreserveArgs,
274  const CallEvent &Call) {
275  unsigned Idx = 0;
276  for (CallEvent::param_type_iterator I = Call.param_type_begin(),
277  E = Call.param_type_end();
278  I != E; ++I, ++Idx) {
279  if (isPointerToConst(*I))
280  PreserveArgs.insert(Idx);
281  }
282 }
283 
285  ProgramStateRef Orig) const {
286  ProgramStateRef Result = (Orig ? Orig : getState());
287 
288  // Don't invalidate anything if the callee is marked pure/const.
289  if (const Decl *callee = getDecl())
290  if (callee->hasAttr<PureAttr>() || callee->hasAttr<ConstAttr>())
291  return Result;
292 
293  SmallVector<SVal, 8> ValuesToInvalidate;
295 
296  getExtraInvalidatedValues(ValuesToInvalidate, &ETraits);
297 
298  // Indexes of arguments whose values will be preserved by the call.
299  llvm::SmallSet<unsigned, 4> PreserveArgs;
300  if (!argumentsMayEscape())
301  findPtrToConstParams(PreserveArgs, *this);
302 
303  for (unsigned Idx = 0, Count = getNumArgs(); Idx != Count; ++Idx) {
304  // Mark this region for invalidation. We batch invalidate regions
305  // below for efficiency.
306  if (PreserveArgs.count(Idx))
307  if (const MemRegion *MR = getArgSVal(Idx).getAsRegion())
308  ETraits.setTrait(MR->getBaseRegion(),
310  // TODO: Factor this out + handle the lower level const pointers.
311 
312  ValuesToInvalidate.push_back(getArgSVal(Idx));
313 
314  // If a function accepts an object by argument (which would of course be a
315  // temporary that isn't lifetime-extended), invalidate the object itself,
316  // not only other objects reachable from it. This is necessary because the
317  // destructor has access to the temporary object after the call.
318  // TODO: Support placement arguments once we start
319  // constructing them directly.
320  // TODO: This is unnecessary when there's no destructor, but that's
321  // currently hard to figure out.
322  if (getKind() != CE_CXXAllocator)
324  if (auto AdjIdx = getAdjustedParameterIndex(Idx))
325  if (const VarRegion *VR = getParameterLocation(*AdjIdx))
326  ValuesToInvalidate.push_back(loc::MemRegionVal(VR));
327  }
328 
329  // Invalidate designated regions using the batch invalidation API.
330  // NOTE: Even if RegionsToInvalidate is empty, we may still invalidate
331  // global variables.
332  return Result->invalidateRegions(ValuesToInvalidate, getOriginExpr(),
333  BlockCount, getLocationContext(),
334  /*CausedByPointerEscape*/ true,
335  /*Symbols=*/nullptr, this, &ETraits);
336 }
337 
339  const ProgramPointTag *Tag) const {
340  if (const Expr *E = getOriginExpr()) {
341  if (IsPreVisit)
342  return PreStmt(E, getLocationContext(), Tag);
343  return PostStmt(E, getLocationContext(), Tag);
344  }
345 
346  const Decl *D = getDecl();
347  assert(D && "Cannot get a program point without a statement or decl");
348 
350  if (IsPreVisit)
351  return PreImplicitCall(D, Loc, getLocationContext(), Tag);
352  return PostImplicitCall(D, Loc, getLocationContext(), Tag);
353 }
354 
355 bool CallEvent::isCalled(const CallDescription &CD) const {
356  // FIXME: Add ObjC Message support.
357  if (getKind() == CE_ObjCMessage)
358  return false;
359 
360  const IdentifierInfo *II = getCalleeIdentifier();
361  if (!II)
362  return false;
363  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(getDecl());
364  if (!FD)
365  return false;
366 
367  if (CD.Flags & CDF_MaybeBuiltin) {
369  (!CD.RequiredArgs || CD.RequiredArgs <= getNumArgs());
370  }
371 
372  if (!CD.IsLookupDone) {
373  CD.IsLookupDone = true;
374  CD.II = &getState()->getStateManager().getContext().Idents.get(
375  CD.getFunctionName());
376  }
377 
378  if (II != CD.II)
379  return false;
380 
381  // If CallDescription provides prefix names, use them to improve matching
382  // accuracy.
383  if (CD.QualifiedName.size() > 1 && FD) {
384  const DeclContext *Ctx = FD->getDeclContext();
385  // See if we'll be able to match them all.
386  size_t NumUnmatched = CD.QualifiedName.size() - 1;
387  for (; Ctx && isa<NamedDecl>(Ctx); Ctx = Ctx->getParent()) {
388  if (NumUnmatched == 0)
389  break;
390 
391  if (const auto *ND = dyn_cast<NamespaceDecl>(Ctx)) {
392  if (ND->getName() == CD.QualifiedName[NumUnmatched - 1])
393  --NumUnmatched;
394  continue;
395  }
396 
397  if (const auto *RD = dyn_cast<RecordDecl>(Ctx)) {
398  if (RD->getName() == CD.QualifiedName[NumUnmatched - 1])
399  --NumUnmatched;
400  continue;
401  }
402  }
403 
404  if (NumUnmatched > 0)
405  return false;
406  }
407 
408  return (!CD.RequiredArgs || CD.RequiredArgs == getNumArgs());
409 }
410 
411 SVal CallEvent::getArgSVal(unsigned Index) const {
412  const Expr *ArgE = getArgExpr(Index);
413  if (!ArgE)
414  return UnknownVal();
415  return getSVal(ArgE);
416 }
417 
419  const Expr *ArgE = getArgExpr(Index);
420  if (!ArgE)
421  return {};
422  return ArgE->getSourceRange();
423 }
424 
426  const Expr *E = getOriginExpr();
427  if (!E)
428  return UndefinedVal();
429  return getSVal(E);
430 }
431 
432 LLVM_DUMP_METHOD void CallEvent::dump() const { dump(llvm::errs()); }
433 
434 void CallEvent::dump(raw_ostream &Out) const {
435  ASTContext &Ctx = getState()->getStateManager().getContext();
436  if (const Expr *E = getOriginExpr()) {
437  E->printPretty(Out, nullptr, Ctx.getPrintingPolicy());
438  Out << "\n";
439  return;
440  }
441 
442  if (const Decl *D = getDecl()) {
443  Out << "Call to ";
444  D->print(Out, Ctx.getPrintingPolicy());
445  return;
446  }
447 
448  // FIXME: a string representation of the kind would be nice.
449  Out << "Unknown call (type " << getKind() << ")";
450 }
451 
452 bool CallEvent::isCallStmt(const Stmt *S) {
453  return isa<CallExpr>(S) || isa<ObjCMessageExpr>(S)
454  || isa<CXXConstructExpr>(S)
455  || isa<CXXNewExpr>(S);
456 }
457 
459  assert(D);
460  if (const auto *FD = dyn_cast<FunctionDecl>(D))
461  return FD->getReturnType();
462  if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
463  return MD->getReturnType();
464  if (const auto *BD = dyn_cast<BlockDecl>(D)) {
465  // Blocks are difficult because the return type may not be stored in the
466  // BlockDecl itself. The AST should probably be enhanced, but for now we
467  // just do what we can.
468  // If the block is declared without an explicit argument list, the
469  // signature-as-written just includes the return type, not the entire
470  // function type.
471  // FIXME: All blocks should have signatures-as-written, even if the return
472  // type is inferred. (That's signified with a dependent result type.)
473  if (const TypeSourceInfo *TSI = BD->getSignatureAsWritten()) {
474  QualType Ty = TSI->getType();
475  if (const FunctionType *FT = Ty->getAs<FunctionType>())
476  Ty = FT->getReturnType();
477  if (!Ty->isDependentType())
478  return Ty;
479  }
480 
481  return {};
482  }
483 
484  llvm_unreachable("unknown callable kind");
485 }
486 
487 bool CallEvent::isVariadic(const Decl *D) {
488  assert(D);
489 
490  if (const auto *FD = dyn_cast<FunctionDecl>(D))
491  return FD->isVariadic();
492  if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
493  return MD->isVariadic();
494  if (const auto *BD = dyn_cast<BlockDecl>(D))
495  return BD->isVariadic();
496 
497  llvm_unreachable("unknown callable kind");
498 }
499 
500 static void addParameterValuesToBindings(const StackFrameContext *CalleeCtx,
501  CallEvent::BindingsTy &Bindings,
502  SValBuilder &SVB,
503  const CallEvent &Call,
504  ArrayRef<ParmVarDecl*> parameters) {
505  MemRegionManager &MRMgr = SVB.getRegionManager();
506 
507  // If the function has fewer parameters than the call has arguments, we simply
508  // do not bind any values to them.
509  unsigned NumArgs = Call.getNumArgs();
510  unsigned Idx = 0;
511  ArrayRef<ParmVarDecl*>::iterator I = parameters.begin(), E = parameters.end();
512  for (; I != E && Idx < NumArgs; ++I, ++Idx) {
513  const ParmVarDecl *ParamDecl = *I;
514  assert(ParamDecl && "Formal parameter has no decl?");
515 
516  // TODO: Support allocator calls.
517  if (Call.getKind() != CE_CXXAllocator)
518  if (Call.isArgumentConstructedDirectly(Idx))
519  continue;
520 
521  // TODO: Allocators should receive the correct size and possibly alignment,
522  // determined in compile-time but not represented as arg-expressions,
523  // which makes getArgSVal() fail and return UnknownVal.
524  SVal ArgVal = Call.getArgSVal(Idx);
525  if (!ArgVal.isUnknown()) {
526  Loc ParamLoc = SVB.makeLoc(MRMgr.getVarRegion(ParamDecl, CalleeCtx));
527  Bindings.push_back(std::make_pair(ParamLoc, ArgVal));
528  }
529  }
530 
531  // FIXME: Variadic arguments are not handled at all right now.
532 }
533 
535  const FunctionDecl *D = getDecl();
536  if (!D)
537  return None;
538  return D->parameters();
539 }
540 
542  const FunctionDecl *FD = getDecl();
543  if (!FD)
544  return {};
545 
546  // Note that the AnalysisDeclContext will have the FunctionDecl with
547  // the definition (if one exists).
548  AnalysisDeclContext *AD =
550  getManager()->getContext(FD);
551  bool IsAutosynthesized;
552  Stmt* Body = AD->getBody(IsAutosynthesized);
553  LLVM_DEBUG({
554  if (IsAutosynthesized)
555  llvm::dbgs() << "Using autosynthesized body for " << FD->getName()
556  << "\n";
557  });
558  if (Body) {
559  const Decl* Decl = AD->getDecl();
560  return RuntimeDefinition(Decl);
561  }
562 
563  SubEngine &Engine = getState()->getStateManager().getOwningEngine();
564  AnalyzerOptions &Opts = Engine.getAnalysisManager().options;
565 
566  // Try to get CTU definition only if CTUDir is provided.
567  if (!Opts.IsNaiveCTUEnabled)
568  return {};
569 
572  llvm::Expected<const FunctionDecl *> CTUDeclOrError =
573  CTUCtx.getCrossTUDefinition(FD, Opts.CTUDir, Opts.CTUIndexName,
574  Opts.DisplayCTUProgress);
575 
576  if (!CTUDeclOrError) {
577  handleAllErrors(CTUDeclOrError.takeError(),
578  [&](const cross_tu::IndexError &IE) {
579  CTUCtx.emitCrossTUDiagnostics(IE);
580  });
581  return {};
582  }
583 
584  return RuntimeDefinition(*CTUDeclOrError);
585 }
586 
588  const StackFrameContext *CalleeCtx,
589  BindingsTy &Bindings) const {
590  const auto *D = cast<FunctionDecl>(CalleeCtx->getDecl());
591  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
592  addParameterValuesToBindings(CalleeCtx, Bindings, SVB, *this,
593  D->parameters());
594 }
595 
598  return true;
599 
600  const FunctionDecl *D = getDecl();
601  if (!D)
602  return true;
603 
604  const IdentifierInfo *II = D->getIdentifier();
605  if (!II)
606  return false;
607 
608  // This set of "escaping" APIs is
609 
610  // - 'int pthread_setspecific(ptheread_key k, const void *)' stores a
611  // value into thread local storage. The value can later be retrieved with
612  // 'void *ptheread_getspecific(pthread_key)'. So even thought the
613  // parameter is 'const void *', the region escapes through the call.
614  if (II->isStr("pthread_setspecific"))
615  return true;
616 
617  // - xpc_connection_set_context stores a value which can be retrieved later
618  // with xpc_connection_get_context.
619  if (II->isStr("xpc_connection_set_context"))
620  return true;
621 
622  // - funopen - sets a buffer for future IO calls.
623  if (II->isStr("funopen"))
624  return true;
625 
626  // - __cxa_demangle - can reallocate memory and can return the pointer to
627  // the input buffer.
628  if (II->isStr("__cxa_demangle"))
629  return true;
630 
631  StringRef FName = II->getName();
632 
633  // - CoreFoundation functions that end with "NoCopy" can free a passed-in
634  // buffer even if it is const.
635  if (FName.endswith("NoCopy"))
636  return true;
637 
638  // - NSXXInsertXX, for example NSMapInsertIfAbsent, since they can
639  // be deallocated by NSMapRemove.
640  if (FName.startswith("NS") && (FName.find("Insert") != StringRef::npos))
641  return true;
642 
643  // - Many CF containers allow objects to escape through custom
644  // allocators/deallocators upon container construction. (PR12101)
645  if (FName.startswith("CF") || FName.startswith("CG")) {
646  return StrInStrNoCase(FName, "InsertValue") != StringRef::npos ||
647  StrInStrNoCase(FName, "AddValue") != StringRef::npos ||
648  StrInStrNoCase(FName, "SetValue") != StringRef::npos ||
649  StrInStrNoCase(FName, "WithData") != StringRef::npos ||
650  StrInStrNoCase(FName, "AppendValue") != StringRef::npos ||
651  StrInStrNoCase(FName, "SetAttribute") != StringRef::npos;
652  }
653 
654  return false;
655 }
656 
658  const FunctionDecl *D = getOriginExpr()->getDirectCallee();
659  if (D)
660  return D;
661 
662  return getSVal(getOriginExpr()->getCallee()).getAsFunctionDecl();
663 }
664 
666  const auto *CE = cast_or_null<CallExpr>(getOriginExpr());
667  if (!CE)
668  return AnyFunctionCall::getDecl();
669 
670  const FunctionDecl *D = CE->getDirectCallee();
671  if (D)
672  return D;
673 
674  return getSVal(CE->getCallee()).getAsFunctionDecl();
675 }
676 
678  ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const {
679  SVal ThisVal = getCXXThisVal();
680  Values.push_back(ThisVal);
681 
682  // Don't invalidate if the method is const and there are no mutable fields.
683  if (const auto *D = cast_or_null<CXXMethodDecl>(getDecl())) {
684  if (!D->isConst())
685  return;
686  // Get the record decl for the class of 'This'. D->getParent() may return a
687  // base class decl, rather than the class of the instance which needs to be
688  // checked for mutable fields.
689  // TODO: We might as well look at the dynamic type of the object.
690  const Expr *Ex = getCXXThisExpr()->ignoreParenBaseCasts();
691  QualType T = Ex->getType();
692  if (T->isPointerType()) // Arrow or implicit-this syntax?
693  T = T->getPointeeType();
694  const CXXRecordDecl *ParentRecord = T->getAsCXXRecordDecl();
695  assert(ParentRecord);
696  if (ParentRecord->hasMutableFields())
697  return;
698  // Preserve CXXThis.
699  const MemRegion *ThisRegion = ThisVal.getAsRegion();
700  if (!ThisRegion)
701  return;
702 
703  ETraits->setTrait(ThisRegion->getBaseRegion(),
705  }
706 }
707 
709  const Expr *Base = getCXXThisExpr();
710  // FIXME: This doesn't handle an overloaded ->* operator.
711  if (!Base)
712  return UnknownVal();
713 
714  SVal ThisVal = getSVal(Base);
715  assert(ThisVal.isUnknownOrUndef() || ThisVal.getAs<Loc>());
716  return ThisVal;
717 }
718 
719 RuntimeDefinition CXXInstanceCall::getRuntimeDefinition() const {
720  // Do we have a decl at all?
721  const Decl *D = getDecl();
722  if (!D)
723  return {};
724 
725  // If the method is non-virtual, we know we can inline it.
726  const auto *MD = cast<CXXMethodDecl>(D);
727  if (!MD->isVirtual())
729 
730  // Do we know the implicit 'this' object being called?
731  const MemRegion *R = getCXXThisVal().getAsRegion();
732  if (!R)
733  return {};
734 
735  // Do we know anything about the type of 'this'?
736  DynamicTypeInfo DynType = getDynamicTypeInfo(getState(), R);
737  if (!DynType.isValid())
738  return {};
739 
740  // Is the type a C++ class? (This is mostly a defensive check.)
741  QualType RegionType = DynType.getType()->getPointeeType();
742  assert(!RegionType.isNull() && "DynamicTypeInfo should always be a pointer.");
743 
744  const CXXRecordDecl *RD = RegionType->getAsCXXRecordDecl();
745  if (!RD || !RD->hasDefinition())
746  return {};
747 
748  // Find the decl for this method in that class.
749  const CXXMethodDecl *Result = MD->getCorrespondingMethodInClass(RD, true);
750  if (!Result) {
751  // We might not even get the original statically-resolved method due to
752  // some particularly nasty casting (e.g. casts to sister classes).
753  // However, we should at least be able to search up and down our own class
754  // hierarchy, and some real bugs have been caught by checking this.
755  assert(!RD->isDerivedFrom(MD->getParent()) && "Couldn't find known method");
756 
757  // FIXME: This is checking that our DynamicTypeInfo is at least as good as
758  // the static type. However, because we currently don't update
759  // DynamicTypeInfo when an object is cast, we can't actually be sure the
760  // DynamicTypeInfo is up to date. This assert should be re-enabled once
761  // this is fixed. <rdar://problem/12287087>
762  //assert(!MD->getParent()->isDerivedFrom(RD) && "Bad DynamicTypeInfo");
763 
764  return {};
765  }
766 
767  // Does the decl that we found have an implementation?
768  const FunctionDecl *Definition;
769  if (!Result->hasBody(Definition)) {
770  if (!DynType.canBeASubClass())
772  return {};
773  }
774 
775  // We found a definition. If we're not sure that this devirtualization is
776  // actually what will happen at runtime, make sure to provide the region so
777  // that ExprEngine can decide what to do with it.
778  if (DynType.canBeASubClass())
779  return RuntimeDefinition(Definition, R->StripCasts());
780  return RuntimeDefinition(Definition, /*DispatchRegion=*/nullptr);
781 }
782 
784  const StackFrameContext *CalleeCtx,
785  BindingsTy &Bindings) const {
787 
788  // Handle the binding of 'this' in the new stack frame.
789  SVal ThisVal = getCXXThisVal();
790  if (!ThisVal.isUnknown()) {
791  ProgramStateManager &StateMgr = getState()->getStateManager();
792  SValBuilder &SVB = StateMgr.getSValBuilder();
793 
794  const auto *MD = cast<CXXMethodDecl>(CalleeCtx->getDecl());
795  Loc ThisLoc = SVB.getCXXThis(MD, CalleeCtx);
796 
797  // If we devirtualized to a different member function, we need to make sure
798  // we have the proper layering of CXXBaseObjectRegions.
799  if (MD->getCanonicalDecl() != getDecl()->getCanonicalDecl()) {
800  ASTContext &Ctx = SVB.getContext();
801  const CXXRecordDecl *Class = MD->getParent();
802  QualType Ty = Ctx.getPointerType(Ctx.getRecordType(Class));
803 
804  // FIXME: CallEvent maybe shouldn't be directly accessing StoreManager.
805  bool Failed;
806  ThisVal = StateMgr.getStoreManager().attemptDownCast(ThisVal, Ty, Failed);
807  if (Failed) {
808  // We might have suffered some sort of placement new earlier, so
809  // we're constructing in a completely unexpected storage.
810  // Fall back to a generic pointer cast for this-value.
811  const CXXMethodDecl *StaticMD = cast<CXXMethodDecl>(getDecl());
812  const CXXRecordDecl *StaticClass = StaticMD->getParent();
813  QualType StaticTy = Ctx.getPointerType(Ctx.getRecordType(StaticClass));
814  ThisVal = SVB.evalCast(ThisVal, Ty, StaticTy);
815  }
816  }
817 
818  if (!ThisVal.isUnknown())
819  Bindings.push_back(std::make_pair(ThisLoc, ThisVal));
820  }
821 }
822 
824  return getOriginExpr()->getImplicitObjectArgument();
825 }
826 
827 RuntimeDefinition CXXMemberCall::getRuntimeDefinition() const {
828  // C++11 [expr.call]p1: ...If the selected function is non-virtual, or if the
829  // id-expression in the class member access expression is a qualified-id,
830  // that function is called. Otherwise, its final overrider in the dynamic type
831  // of the object expression is called.
832  if (const auto *ME = dyn_cast<MemberExpr>(getOriginExpr()->getCallee()))
833  if (ME->hasQualifier())
835 
837 }
838 
840  return getOriginExpr()->getArg(0);
841 }
842 
843 const BlockDataRegion *BlockCall::getBlockRegion() const {
844  const Expr *Callee = getOriginExpr()->getCallee();
845  const MemRegion *DataReg = getSVal(Callee).getAsRegion();
846 
847  return dyn_cast_or_null<BlockDataRegion>(DataReg);
848 }
849 
851  const BlockDecl *D = getDecl();
852  if (!D)
853  return None;
854  return D->parameters();
855 }
856 
858  RegionAndSymbolInvalidationTraits *ETraits) const {
859  // FIXME: This also needs to invalidate captured globals.
860  if (const MemRegion *R = getBlockRegion())
861  Values.push_back(loc::MemRegionVal(R));
862 }
863 
865  BindingsTy &Bindings) const {
866  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
867  ArrayRef<ParmVarDecl*> Params;
868  if (isConversionFromLambda()) {
869  auto *LambdaOperatorDecl = cast<CXXMethodDecl>(CalleeCtx->getDecl());
870  Params = LambdaOperatorDecl->parameters();
871 
872  // For blocks converted from a C++ lambda, the callee declaration is the
873  // operator() method on the lambda so we bind "this" to
874  // the lambda captured by the block.
875  const VarRegion *CapturedLambdaRegion = getRegionStoringCapturedLambda();
876  SVal ThisVal = loc::MemRegionVal(CapturedLambdaRegion);
877  Loc ThisLoc = SVB.getCXXThis(LambdaOperatorDecl, CalleeCtx);
878  Bindings.push_back(std::make_pair(ThisLoc, ThisVal));
879  } else {
880  Params = cast<BlockDecl>(CalleeCtx->getDecl())->parameters();
881  }
882 
883  addParameterValuesToBindings(CalleeCtx, Bindings, SVB, *this,
884  Params);
885 }
886 
888  if (Data)
889  return loc::MemRegionVal(static_cast<const MemRegion *>(Data));
890  return UnknownVal();
891 }
892 
894  RegionAndSymbolInvalidationTraits *ETraits) const {
895  if (Data) {
896  loc::MemRegionVal MV(static_cast<const MemRegion *>(Data));
897  if (SymbolRef Sym = MV.getAsSymbol(true))
898  ETraits->setTrait(Sym,
900  Values.push_back(MV);
901  }
902 }
903 
905  const StackFrameContext *CalleeCtx,
906  BindingsTy &Bindings) const {
908 
909  SVal ThisVal = getCXXThisVal();
910  if (!ThisVal.isUnknown()) {
911  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
912  const auto *MD = cast<CXXMethodDecl>(CalleeCtx->getDecl());
913  Loc ThisLoc = SVB.getCXXThis(MD, CalleeCtx);
914  Bindings.push_back(std::make_pair(ThisLoc, ThisVal));
915  }
916 }
917 
919  if (Data)
920  return loc::MemRegionVal(DtorDataTy::getFromOpaqueValue(Data).getPointer());
921  return UnknownVal();
922 }
923 
924 RuntimeDefinition CXXDestructorCall::getRuntimeDefinition() const {
925  // Base destructors are always called non-virtually.
926  // Skip CXXInstanceCall's devirtualization logic in this case.
927  if (isBaseDestructor())
929 
931 }
932 
934  const ObjCMethodDecl *D = getDecl();
935  if (!D)
936  return None;
937  return D->parameters();
938 }
939 
941  ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const {
942 
943  // If the method call is a setter for property known to be backed by
944  // an instance variable, don't invalidate the entire receiver, just
945  // the storage for that instance variable.
946  if (const ObjCPropertyDecl *PropDecl = getAccessedProperty()) {
947  if (const ObjCIvarDecl *PropIvar = PropDecl->getPropertyIvarDecl()) {
948  SVal IvarLVal = getState()->getLValue(PropIvar, getReceiverSVal());
949  if (const MemRegion *IvarRegion = IvarLVal.getAsRegion()) {
950  ETraits->setTrait(
951  IvarRegion,
953  ETraits->setTrait(
954  IvarRegion,
956  Values.push_back(IvarLVal);
957  }
958  return;
959  }
960  }
961 
962  Values.push_back(getReceiverSVal());
963 }
964 
966  const LocationContext *LCtx = getLocationContext();
967  const ImplicitParamDecl *SelfDecl = LCtx->getSelfDecl();
968  if (!SelfDecl)
969  return SVal();
970  return getState()->getSVal(getState()->getRegion(SelfDecl, LCtx));
971 }
972 
974  // FIXME: Is this the best way to handle class receivers?
975  if (!isInstanceMessage())
976  return UnknownVal();
977 
978  if (const Expr *RecE = getOriginExpr()->getInstanceReceiver())
979  return getSVal(RecE);
980 
981  // An instance message with no expression means we are sending to super.
982  // In this case the object reference is the same as 'self'.
983  assert(getOriginExpr()->getReceiverKind() == ObjCMessageExpr::SuperInstance);
984  SVal SelfVal = getSelfSVal();
985  assert(SelfVal.isValid() && "Calling super but not in ObjC method");
986  return SelfVal;
987 }
988 
990  if (getOriginExpr()->getReceiverKind() == ObjCMessageExpr::SuperInstance ||
991  getOriginExpr()->getReceiverKind() == ObjCMessageExpr::SuperClass)
992  return true;
993 
994  if (!isInstanceMessage())
995  return false;
996 
997  SVal RecVal = getSVal(getOriginExpr()->getInstanceReceiver());
998 
999  return (RecVal == getSelfSVal());
1000 }
1001 
1003  switch (getMessageKind()) {
1004  case OCM_Message:
1005  return getOriginExpr()->getSourceRange();
1006  case OCM_PropertyAccess:
1007  case OCM_Subscript:
1008  return getContainingPseudoObjectExpr()->getSourceRange();
1009  }
1010  llvm_unreachable("unknown message kind");
1011 }
1012 
1013 using ObjCMessageDataTy = llvm::PointerIntPair<const PseudoObjectExpr *, 2>;
1014 
1015 const PseudoObjectExpr *ObjCMethodCall::getContainingPseudoObjectExpr() const {
1016  assert(Data && "Lazy lookup not yet performed.");
1017  assert(getMessageKind() != OCM_Message && "Explicit message send.");
1018  return ObjCMessageDataTy::getFromOpaqueValue(Data).getPointer();
1019 }
1020 
1021 static const Expr *
1023  const Expr *Syntactic = POE->getSyntacticForm();
1024 
1025  // This handles the funny case of assigning to the result of a getter.
1026  // This can happen if the getter returns a non-const reference.
1027  if (const auto *BO = dyn_cast<BinaryOperator>(Syntactic))
1028  Syntactic = BO->getLHS();
1029 
1030  return Syntactic;
1031 }
1032 
1034  if (!Data) {
1035  // Find the parent, ignoring implicit casts.
1037  const Stmt *S = PM.getParentIgnoreParenCasts(getOriginExpr());
1038 
1039  // Check if parent is a PseudoObjectExpr.
1040  if (const auto *POE = dyn_cast_or_null<PseudoObjectExpr>(S)) {
1041  const Expr *Syntactic = getSyntacticFromForPseudoObjectExpr(POE);
1042 
1043  ObjCMessageKind K;
1044  switch (Syntactic->getStmtClass()) {
1045  case Stmt::ObjCPropertyRefExprClass:
1046  K = OCM_PropertyAccess;
1047  break;
1048  case Stmt::ObjCSubscriptRefExprClass:
1049  K = OCM_Subscript;
1050  break;
1051  default:
1052  // FIXME: Can this ever happen?
1053  K = OCM_Message;
1054  break;
1055  }
1056 
1057  if (K != OCM_Message) {
1058  const_cast<ObjCMethodCall *>(this)->Data
1059  = ObjCMessageDataTy(POE, K).getOpaqueValue();
1060  assert(getMessageKind() == K);
1061  return K;
1062  }
1063  }
1064 
1065  const_cast<ObjCMethodCall *>(this)->Data
1066  = ObjCMessageDataTy(nullptr, 1).getOpaqueValue();
1067  assert(getMessageKind() == OCM_Message);
1068  return OCM_Message;
1069  }
1070 
1071  ObjCMessageDataTy Info = ObjCMessageDataTy::getFromOpaqueValue(Data);
1072  if (!Info.getPointer())
1073  return OCM_Message;
1074  return static_cast<ObjCMessageKind>(Info.getInt());
1075 }
1076 
1078  // Look for properties accessed with property syntax (foo.bar = ...)
1079  if ( getMessageKind() == OCM_PropertyAccess) {
1080  const PseudoObjectExpr *POE = getContainingPseudoObjectExpr();
1081  assert(POE && "Property access without PseudoObjectExpr?");
1082 
1083  const Expr *Syntactic = getSyntacticFromForPseudoObjectExpr(POE);
1084  auto *RefExpr = cast<ObjCPropertyRefExpr>(Syntactic);
1085 
1086  if (RefExpr->isExplicitProperty())
1087  return RefExpr->getExplicitProperty();
1088  }
1089 
1090  // Look for properties accessed with method syntax ([foo setBar:...]).
1091  const ObjCMethodDecl *MD = getDecl();
1092  if (!MD || !MD->isPropertyAccessor())
1093  return nullptr;
1094 
1095  // Note: This is potentially quite slow.
1096  return MD->findPropertyDecl();
1097 }
1098 
1100  Selector Sel) const {
1101  assert(IDecl);
1102  AnalysisManager &AMgr =
1103  getState()->getStateManager().getOwningEngine().getAnalysisManager();
1104  // If the class interface is declared inside the main file, assume it is not
1105  // subcassed.
1106  // TODO: It could actually be subclassed if the subclass is private as well.
1107  // This is probably very rare.
1108  SourceLocation InterfLoc = IDecl->getEndOfDefinitionLoc();
1109  if (InterfLoc.isValid() && AMgr.isInCodeFile(InterfLoc))
1110  return false;
1111 
1112  // Assume that property accessors are not overridden.
1113  if (getMessageKind() == OCM_PropertyAccess)
1114  return false;
1115 
1116  // We assume that if the method is public (declared outside of main file) or
1117  // has a parent which publicly declares the method, the method could be
1118  // overridden in a subclass.
1119 
1120  // Find the first declaration in the class hierarchy that declares
1121  // the selector.
1122  ObjCMethodDecl *D = nullptr;
1123  while (true) {
1124  D = IDecl->lookupMethod(Sel, true);
1125 
1126  // Cannot find a public definition.
1127  if (!D)
1128  return false;
1129 
1130  // If outside the main file,
1131  if (D->getLocation().isValid() && !AMgr.isInCodeFile(D->getLocation()))
1132  return true;
1133 
1134  if (D->isOverriding()) {
1135  // Search in the superclass on the next iteration.
1136  IDecl = D->getClassInterface();
1137  if (!IDecl)
1138  return false;
1139 
1140  IDecl = IDecl->getSuperClass();
1141  if (!IDecl)
1142  return false;
1143 
1144  continue;
1145  }
1146 
1147  return false;
1148  };
1149 
1150  llvm_unreachable("The while loop should always terminate.");
1151 }
1152 
1154  if (!MD)
1155  return MD;
1156 
1157  // Find the redeclaration that defines the method.
1158  if (!MD->hasBody()) {
1159  for (auto I : MD->redecls())
1160  if (I->hasBody())
1161  MD = cast<ObjCMethodDecl>(I);
1162  }
1163  return MD;
1164 }
1165 
1166 static bool isCallToSelfClass(const ObjCMessageExpr *ME) {
1167  const Expr* InstRec = ME->getInstanceReceiver();
1168  if (!InstRec)
1169  return false;
1170  const auto *InstRecIg = dyn_cast<DeclRefExpr>(InstRec->IgnoreParenImpCasts());
1171 
1172  // Check that receiver is called 'self'.
1173  if (!InstRecIg || !InstRecIg->getFoundDecl() ||
1174  !InstRecIg->getFoundDecl()->getName().equals("self"))
1175  return false;
1176 
1177  // Check that the method name is 'class'.
1178  if (ME->getSelector().getNumArgs() != 0 ||
1179  !ME->getSelector().getNameForSlot(0).equals("class"))
1180  return false;
1181 
1182  return true;
1183 }
1184 
1185 RuntimeDefinition ObjCMethodCall::getRuntimeDefinition() const {
1186  const ObjCMessageExpr *E = getOriginExpr();
1187  assert(E);
1188  Selector Sel = E->getSelector();
1189 
1190  if (E->isInstanceMessage()) {
1191  // Find the receiver type.
1192  const ObjCObjectPointerType *ReceiverT = nullptr;
1193  bool CanBeSubClassed = false;
1194  QualType SupersType = E->getSuperType();
1195  const MemRegion *Receiver = nullptr;
1196 
1197  if (!SupersType.isNull()) {
1198  // The receiver is guaranteed to be 'super' in this case.
1199  // Super always means the type of immediate predecessor to the method
1200  // where the call occurs.
1201  ReceiverT = cast<ObjCObjectPointerType>(SupersType);
1202  } else {
1203  Receiver = getReceiverSVal().getAsRegion();
1204  if (!Receiver)
1205  return {};
1206 
1207  DynamicTypeInfo DTI = getDynamicTypeInfo(getState(), Receiver);
1208  if (!DTI.isValid()) {
1209  assert(isa<AllocaRegion>(Receiver) &&
1210  "Unhandled untyped region class!");
1211  return {};
1212  }
1213 
1214  QualType DynType = DTI.getType();
1215  CanBeSubClassed = DTI.canBeASubClass();
1216  ReceiverT = dyn_cast<ObjCObjectPointerType>(DynType.getCanonicalType());
1217 
1218  if (ReceiverT && CanBeSubClassed)
1219  if (ObjCInterfaceDecl *IDecl = ReceiverT->getInterfaceDecl())
1220  if (!canBeOverridenInSubclass(IDecl, Sel))
1221  CanBeSubClassed = false;
1222  }
1223 
1224  // Handle special cases of '[self classMethod]' and
1225  // '[[self class] classMethod]', which are treated by the compiler as
1226  // instance (not class) messages. We will statically dispatch to those.
1227  if (auto *PT = dyn_cast_or_null<ObjCObjectPointerType>(ReceiverT)) {
1228  // For [self classMethod], return the compiler visible declaration.
1229  if (PT->getObjectType()->isObjCClass() &&
1230  Receiver == getSelfSVal().getAsRegion())
1231  return RuntimeDefinition(findDefiningRedecl(E->getMethodDecl()));
1232 
1233  // Similarly, handle [[self class] classMethod].
1234  // TODO: We are currently doing a syntactic match for this pattern with is
1235  // limiting as the test cases in Analysis/inlining/InlineObjCClassMethod.m
1236  // shows. A better way would be to associate the meta type with the symbol
1237  // using the dynamic type info tracking and use it here. We can add a new
1238  // SVal for ObjC 'Class' values that know what interface declaration they
1239  // come from. Then 'self' in a class method would be filled in with
1240  // something meaningful in ObjCMethodCall::getReceiverSVal() and we could
1241  // do proper dynamic dispatch for class methods just like we do for
1242  // instance methods now.
1243  if (E->getInstanceReceiver())
1244  if (const auto *M = dyn_cast<ObjCMessageExpr>(E->getInstanceReceiver()))
1245  if (isCallToSelfClass(M))
1246  return RuntimeDefinition(findDefiningRedecl(E->getMethodDecl()));
1247  }
1248 
1249  // Lookup the instance method implementation.
1250  if (ReceiverT)
1251  if (ObjCInterfaceDecl *IDecl = ReceiverT->getInterfaceDecl()) {
1252  // Repeatedly calling lookupPrivateMethod() is expensive, especially
1253  // when in many cases it returns null. We cache the results so
1254  // that repeated queries on the same ObjCIntefaceDecl and Selector
1255  // don't incur the same cost. On some test cases, we can see the
1256  // same query being issued thousands of times.
1257  //
1258  // NOTE: This cache is essentially a "global" variable, but it
1259  // only gets lazily created when we get here. The value of the
1260  // cache probably comes from it being global across ExprEngines,
1261  // where the same queries may get issued. If we are worried about
1262  // concurrency, or possibly loading/unloading ASTs, etc., we may
1263  // need to revisit this someday. In terms of memory, this table
1264  // stays around until clang quits, which also may be bad if we
1265  // need to release memory.
1266  using PrivateMethodKey = std::pair<const ObjCInterfaceDecl *, Selector>;
1267  using PrivateMethodCache =
1268  llvm::DenseMap<PrivateMethodKey, Optional<const ObjCMethodDecl *>>;
1269 
1270  static PrivateMethodCache PMC;
1271  Optional<const ObjCMethodDecl *> &Val = PMC[std::make_pair(IDecl, Sel)];
1272 
1273  // Query lookupPrivateMethod() if the cache does not hit.
1274  if (!Val.hasValue()) {
1275  Val = IDecl->lookupPrivateMethod(Sel);
1276 
1277  // If the method is a property accessor, we should try to "inline" it
1278  // even if we don't actually have an implementation.
1279  if (!*Val)
1280  if (const ObjCMethodDecl *CompileTimeMD = E->getMethodDecl())
1281  if (CompileTimeMD->isPropertyAccessor()) {
1282  if (!CompileTimeMD->getSelfDecl() &&
1283  isa<ObjCCategoryDecl>(CompileTimeMD->getDeclContext())) {
1284  // If the method is an accessor in a category, and it doesn't
1285  // have a self declaration, first
1286  // try to find the method in a class extension. This
1287  // works around a bug in Sema where multiple accessors
1288  // are synthesized for properties in class
1289  // extensions that are redeclared in a category and the
1290  // the implicit parameters are not filled in for
1291  // the method on the category.
1292  // This ensures we find the accessor in the extension, which
1293  // has the implicit parameters filled in.
1294  auto *ID = CompileTimeMD->getClassInterface();
1295  for (auto *CatDecl : ID->visible_extensions()) {
1296  Val = CatDecl->getMethod(Sel,
1297  CompileTimeMD->isInstanceMethod());
1298  if (*Val)
1299  break;
1300  }
1301  }
1302  if (!*Val)
1303  Val = IDecl->lookupInstanceMethod(Sel);
1304  }
1305  }
1306 
1307  const ObjCMethodDecl *MD = Val.getValue();
1308  if (CanBeSubClassed)
1309  return RuntimeDefinition(MD, Receiver);
1310  else
1311  return RuntimeDefinition(MD, nullptr);
1312  }
1313  } else {
1314  // This is a class method.
1315  // If we have type info for the receiver class, we are calling via
1316  // class name.
1317  if (ObjCInterfaceDecl *IDecl = E->getReceiverInterface()) {
1318  // Find/Return the method implementation.
1319  return RuntimeDefinition(IDecl->lookupPrivateClassMethod(Sel));
1320  }
1321  }
1322 
1323  return {};
1324 }
1325 
1327  if (isInSystemHeader() && !isInstanceMessage()) {
1328  Selector Sel = getSelector();
1329  if (Sel.getNumArgs() == 1 &&
1330  Sel.getIdentifierInfoForSlot(0)->isStr("valueWithPointer"))
1331  return true;
1332  }
1333 
1335 }
1336 
1338  const StackFrameContext *CalleeCtx,
1339  BindingsTy &Bindings) const {
1340  const auto *D = cast<ObjCMethodDecl>(CalleeCtx->getDecl());
1341  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
1342  addParameterValuesToBindings(CalleeCtx, Bindings, SVB, *this,
1343  D->parameters());
1344 
1345  SVal SelfVal = getReceiverSVal();
1346  if (!SelfVal.isUnknown()) {
1347  const VarDecl *SelfD = CalleeCtx->getAnalysisDeclContext()->getSelfDecl();
1348  MemRegionManager &MRMgr = SVB.getRegionManager();
1349  Loc SelfLoc = SVB.makeLoc(MRMgr.getVarRegion(SelfD, CalleeCtx));
1350  Bindings.push_back(std::make_pair(SelfLoc, SelfVal));
1351  }
1352 }
1353 
1354 CallEventRef<>
1356  const LocationContext *LCtx) {
1357  if (const auto *MCE = dyn_cast<CXXMemberCallExpr>(CE))
1358  return create<CXXMemberCall>(MCE, State, LCtx);
1359 
1360  if (const auto *OpCE = dyn_cast<CXXOperatorCallExpr>(CE)) {
1361  const FunctionDecl *DirectCallee = OpCE->getDirectCallee();
1362  if (const auto *MD = dyn_cast<CXXMethodDecl>(DirectCallee))
1363  if (MD->isInstance())
1364  return create<CXXMemberOperatorCall>(OpCE, State, LCtx);
1365 
1366  } else if (CE->getCallee()->getType()->isBlockPointerType()) {
1367  return create<BlockCall>(CE, State, LCtx);
1368  }
1369 
1370  // Otherwise, it's a normal function call, static member function call, or
1371  // something we can't reason about.
1372  return create<SimpleFunctionCall>(CE, State, LCtx);
1373 }
1374 
1375 CallEventRef<>
1377  ProgramStateRef State) {
1378  const LocationContext *ParentCtx = CalleeCtx->getParent();
1379  const LocationContext *CallerCtx = ParentCtx->getStackFrame();
1380  assert(CallerCtx && "This should not be used for top-level stack frames");
1381 
1382  const Stmt *CallSite = CalleeCtx->getCallSite();
1383 
1384  if (CallSite) {
1385  if (CallEventRef<> Out = getCall(CallSite, State, CallerCtx))
1386  return Out;
1387 
1388  // All other cases are handled by getCall.
1389  assert(isa<CXXConstructExpr>(CallSite) &&
1390  "This is not an inlineable statement");
1391 
1392  SValBuilder &SVB = State->getStateManager().getSValBuilder();
1393  const auto *Ctor = cast<CXXMethodDecl>(CalleeCtx->getDecl());
1394  Loc ThisPtr = SVB.getCXXThis(Ctor, CalleeCtx);
1395  SVal ThisVal = State->getSVal(ThisPtr);
1396 
1397  return getCXXConstructorCall(cast<CXXConstructExpr>(CallSite),
1398  ThisVal.getAsRegion(), State, CallerCtx);
1399  }
1400 
1401  // Fall back to the CFG. The only thing we haven't handled yet is
1402  // destructors, though this could change in the future.
1403  const CFGBlock *B = CalleeCtx->getCallSiteBlock();
1404  CFGElement E = (*B)[CalleeCtx->getIndex()];
1405  assert((E.getAs<CFGImplicitDtor>() || E.getAs<CFGTemporaryDtor>()) &&
1406  "All other CFG elements should have exprs");
1407 
1408  SValBuilder &SVB = State->getStateManager().getSValBuilder();
1409  const auto *Dtor = cast<CXXDestructorDecl>(CalleeCtx->getDecl());
1410  Loc ThisPtr = SVB.getCXXThis(Dtor, CalleeCtx);
1411  SVal ThisVal = State->getSVal(ThisPtr);
1412 
1413  const Stmt *Trigger;
1415  Trigger = AutoDtor->getTriggerStmt();
1416  else if (Optional<CFGDeleteDtor> DeleteDtor = E.getAs<CFGDeleteDtor>())
1417  Trigger = DeleteDtor->getDeleteExpr();
1418  else
1419  Trigger = Dtor->getBody();
1420 
1421  return getCXXDestructorCall(Dtor, Trigger, ThisVal.getAsRegion(),
1422  E.getAs<CFGBaseDtor>().hasValue(), State,
1423  CallerCtx);
1424 }
1425 
1426 CallEventRef<> CallEventManager::getCall(const Stmt *S, ProgramStateRef State,
1427  const LocationContext *LC) {
1428  if (const auto *CE = dyn_cast<CallExpr>(S)) {
1429  return getSimpleCall(CE, State, LC);
1430  } else if (const auto *NE = dyn_cast<CXXNewExpr>(S)) {
1431  return getCXXAllocatorCall(NE, State, LC);
1432  } else if (const auto *ME = dyn_cast<ObjCMessageExpr>(S)) {
1433  return getObjCMethodCall(ME, State, LC);
1434  } else {
1435  return nullptr;
1436  }
1437 }
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:965
const VarRegion * getParameterLocation(unsigned Index) const
Returns memory location for a parameter variable within the callee stack frame.
Definition: CallEvent.cpp:223
SVal getReceiverSVal() const
Returns the value of the receiver at the time of this call.
Definition: CallEvent.cpp:973
void getExtraInvalidatedValues(ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const override
Definition: CallEvent.cpp:893
Represents a function declaration or definition.
Definition: Decl.h:1748
Expr * getSyntacticForm()
Return the syntactic form of this expression, i.e.
Definition: Expr.h:5707
Smart pointer class that efficiently represents Objective-C method names.
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2569
A (possibly-)qualified type.
Definition: Type.h:643
MemRegion - The root abstract class for all memory regions.
Definition: MemRegion.h:94
bool isBlockPointerType() const
Definition: Type.h:6392
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:596
Selector getSelector() const
Definition: ExprObjC.cpp:337
ObjCInterfaceDecl * getClassInterface()
Definition: DeclObjC.cpp:1143
Stmt * getBody() const
Get the body of the Declaration.
const SymExpr * SymbolRef
static const Expr * getSyntacticFromForPseudoObjectExpr(const PseudoObjectExpr *POE)
Definition: CallEvent.cpp:1022
Stmt - This represents one statement.
Definition: Stmt.h:66
Information about invalidation for a particular region/symbol.
Definition: MemRegion.h:1439
ProgramPoint getProgramPoint(bool IsPreVisit=false, const ProgramPointTag *Tag=nullptr) const
Returns an appropriate ProgramPoint for this call.
Definition: CallEvent.cpp:338
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3387
static bool isCallToSelfClass(const ObjCMessageExpr *ME)
Definition: CallEvent.cpp:1166
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee...
Definition: Type.cpp:505
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:169
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:521
IntrusiveRefCntPtr< const ProgramState > ProgramStateRef
StringRef getFunctionName() const
Get the name of the function that this object matches.
Definition: CallEvent.h:1090
Represents C++ object destructor generated from a call to delete.
Definition: CFG.h:408
SourceRange getSourceRange() const override
Definition: CallEvent.cpp:1002
Represents a program point just before an implicit call event.
Definition: ProgramPoint.h:583
A container of type source information.
Definition: Decl.h:86
CallEventRef getSimpleCall(const CallExpr *E, ProgramStateRef State, const LocationContext *LCtx)
Definition: CallEvent.cpp:1355
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:783
Expr * ignoreParenBaseCasts() LLVM_READONLY
Skip past any parentheses and derived-to-base casts until reaching a fixed point. ...
Definition: Expr.cpp:2964
bool isOverriding() const
Whether this method overrides any other in the class hierarchy.
Definition: DeclObjC.h:449
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:812
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6851
void setTrait(SymbolRef Sym, InvalidationKinds IK)
Definition: MemRegion.cpp:1584
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:120
const Expr * getCXXThisExpr() const override
Returns the expression representing the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:839
ArrayRef< ParmVarDecl * > parameters() const override
Return call&#39;s formal parameters.
Definition: CallEvent.cpp:534
Represents a parameter to a function.
Definition: Decl.h:1564
Defines the clang::Expr interface and subclasses for C++ expressions.
void getExtraInvalidatedValues(ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const override
Definition: CallEvent.cpp:857
IdentifierInfo * getIdentifier() const
Get the identifier that names this declaration, if there is one.
Definition: Decl.h:269
Represents a struct/union/class.
Definition: Decl.h:3626
One of these records is kept for each identifier that is lexed.
RuntimeDefinition getRuntimeDefinition() const override
Definition: CallEvent.cpp:827
param_type_iterator param_type_end() const
Definition: CallEvent.h:449
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:154
field_range fields() const
Definition: Decl.h:3841
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:383
bool isReferenceType() const
Definition: Type.h:6396
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:6529
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:124
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:2289
static void addParameterValuesToBindings(const StackFrameContext *CalleeCtx, CallEvent::BindingsTy &Bindings, SValBuilder &SVB, const CallEvent &Call, ArrayRef< ParmVarDecl *> parameters)
Definition: CallEvent.cpp:500
This class represents a description of a function call using the number of arguments and the name of ...
Definition: CallEvent.h:1057
Represents any expression that calls an Objective-C method.
Definition: CallEvent.h:937
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:153
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:133
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:273
const clang::PrintingPolicy & getPrintingPolicy() const
Definition: ASTContext.h:657
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:259
static const ObjCMethodDecl * findDefiningRedecl(const ObjCMethodDecl *MD)
Definition: CallEvent.cpp:1153
SVal getReturnValue() const
Returns the return value of the call.
Definition: CallEvent.cpp:425
unsigned size() const
Definition: CFG.h:731
const FunctionDecl * getDecl() const override
Returns the declaration of the function or method that will be called.
Definition: CallEvent.h:473
param_type_iterator param_type_begin() const
Returns an iterator over the types of the call&#39;s formal parameters.
Definition: CallEvent.h:445
Represents an ObjC class declaration.
Definition: DeclObjC.h:1171
static bool isVariadic(const Decl *D)
Returns true if the given decl is known to be variadic.
Definition: CallEvent.cpp:487
virtual Decl * getCanonicalDecl()
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclBase.h:877
virtual ArrayRef< ParmVarDecl * > parameters() const =0
Return call&#39;s formal parameters.
const CFGBlock * getCallSiteBlock() const
SmallVectorImpl< FrameBindingTy > BindingsTy
Definition: CallEvent.h:351
const StackFrameContext * getStackFrame(AnalysisDeclContext *Ctx, LocationContext const *Parent, const Stmt *S, const CFGBlock *Blk, unsigned Idx)
const Expr * getCXXThisExpr() const override
Returns the expression representing the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:823
ObjCMessageKind
Represents the ways an Objective-C message send can occur.
Definition: CallEvent.h:928
bool isReceiverSelfOrSuper() const
Checks if the receiver refers to &#39;self&#39; or &#39;super&#39;.
Definition: CallEvent.cpp:989
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1636
const Stmt * getCallSite() const
ArrayRef< ParmVarDecl * > parameters() const override
Definition: CallEvent.cpp:933
Represents a single basic block in a source-level CFG.
Definition: CFG.h:570
bool argumentsMayEscape() const override
Definition: CallEvent.cpp:1326
ArrayRef< ParmVarDecl * > parameters() const override
Definition: CallEvent.cpp:850
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:96
Represents a block literal declaration, which is like an unnamed FunctionDecl.
Definition: Decl.h:3915
This represents one expression.
Definition: Expr.h:108
void getInitialStackFrameContents(const StackFrameContext *CalleeCtx, BindingsTy &Bindings) const override
Definition: CallEvent.cpp:1337
const FunctionDecl * getDecl() const override
Returns the declaration of the function or method that will be called.
Definition: CallEvent.cpp:657
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:1376
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:2634
llvm::mapped_iterator< ArrayRef< ParmVarDecl * >::iterator, GetTypeFn > param_type_iterator
Definition: CallEvent.h:438
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:708
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:864
bool hasBody(const FunctionDecl *&Definition) const
Returns true if the function has a body.
Definition: Decl.cpp:2772
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:1779
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:940
Represents C++ object destructor implicitly generated for base object in destructor.
Definition: CFG.h:434
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:708
ParentMap & getParentMap() const
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:719
bool isConstQualified() const
Determine whether this type is const-qualified.
Definition: Type.h:6201
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:587
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:6181
PseudoObjectExpr - An expression which accesses a pseudo-object l-value.
Definition: Expr.h:5663
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:677
Encodes a location in the source.
const FunctionDecl * getDecl() const override
Definition: CallEvent.cpp:665
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:452
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:401
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:2114
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:1014
const StackFrameContext * getStackFrame() const
Definition: MemRegion.cpp:157
const Decl * getDecl() const
bool isAnyPointerType() const
Definition: Type.h:6388
virtual Optional< unsigned > getAdjustedParameterIndex(unsigned ASTArgumentIndex) const
Some calls have parameter numbering mismatched from argument numbering.
Definition: CallEvent.h:412
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:728
RuntimeDefinition getRuntimeDefinition() const override
Definition: CallEvent.cpp:924
const ObjCMethodDecl * getMethodDecl() const
Definition: ExprObjC.h:1356
Tells that a region&#39;s contents is not changed.
Definition: MemRegion.h:1454
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:1426
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:887
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:1099
const BlockDataRegion * getBlockRegion() const
Returns the region associated with this instance of the block.
Definition: CallEvent.cpp:843
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:418
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
DynamicTypeInfo getDynamicTypeInfo(ProgramStateRef State, const MemRegion *Reg)
Get dynamic type information for a region.
RuntimeDefinition getRuntimeDefinition() const override
Definition: CallEvent.cpp:1185
QualType getSuperType() const
Retrieve the type referred to by &#39;super&#39;.
Definition: ExprObjC.h:1336
StmtClass getStmtClass() const
Definition: Stmt.h:1087
bool hasVoidPointerToNonConstArg() const
Returns true if any of the arguments is void*.
Definition: CallEvent.cpp:157
const CXXRecordDecl * getParent() const
Return the parent of this method declaration, which is the class in which this method is defined...
Definition: DeclCXX.h:2237
Describes a C standard function that is sometimes implemented as a macro that expands to a compiler b...
Definition: CallEvent.h:1052
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:1033
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:2942
Represents a pointer to an Objective C object.
Definition: Type.h:5864
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:4438
ObjCInterfaceDecl * getInterfaceDecl() const
If this pointer points to an Objective @interface type, gets the declaration for that interface...
Definition: Type.h:5920
bool hasBody() const override
Determine whether this method has a body.
Definition: DeclObjC.h:503
static QualType getDeclaredResultType(const Decl *D)
Returns the result type of a function or method declaration.
Definition: CallEvent.cpp:458
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:161
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:69
bool hasMutableFields() const
Determine whether this class, or any of its class subobjects, contains a mutable field.
Definition: DeclCXX.h:1369
const ObjCPropertyDecl * findPropertyDecl(bool CheckOverrides=true) const
Returns the property associated with this method&#39;s selector.
Definition: DeclObjC.cpp:1301
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:130
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:300
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:6643
SVal getCXXThisVal() const override
Returns the value of the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:918
Represents C++ object destructor implicitly generated by compiler on various occasions.
Definition: CFG.h:358
bool isCalled(const CallDescription &CD) const
Returns true if the CallEvent is a call to a function that matches the CallDescription.
Definition: CallEvent.cpp:355
ObjCIvarDecl - Represents an ObjC instance variable.
Definition: DeclObjC.h:1944
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:1013
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:251
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2516
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:275
const ObjCPropertyDecl * getAccessedProperty() const
Definition: CallEvent.cpp:1077
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:284
bool isDependentType() const
Whether this type is a dependent type, meaning that its definition somehow depends on a template para...
Definition: Type.h:2108
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1141
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:4001
bool isPointerType() const
Definition: Type.h:6384
virtual SVal getArgSVal(unsigned Index) const
Returns the value of a given argument at the time of the call.
Definition: CallEvent.cpp:411
An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:128
const void * Data
Definition: CallEvent.h:149
A trivial tuple used to represent a source range.
bool isPropertyAccessor() const
Definition: DeclObjC.h:431
AnalysisDeclContext * getAnalysisDeclContext() const
SourceLocation getEndOfDefinitionLoc() const
Definition: DeclObjC.h:1877
bool isFunctionPointerType() const
Definition: Type.h:6408
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:476
RuntimeDefinition getRuntimeDefinition() const override
Returns the definition of the function or method that will be called.
Definition: CallEvent.cpp:541
SourceLocation getLocation() const
Definition: DeclBase.h:429
ArrayRef< ParmVarDecl * > parameters() const
Definition: DeclObjC.h:366
void getInitialStackFrameContents(const StackFrameContext *CalleeCtx, BindingsTy &Bindings) const override
Definition: CallEvent.cpp:904
ArrayRef< SVal > ValueList
const StackFrameContext * getCalleeStackFrame() const
Returns the callee stack frame.
Definition: CallEvent.cpp:194
virtual AnalysisManager & getAnalysisManager()=0