clang  9.0.0svn
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  if (!CD.IsLookupDone) {
360  CD.IsLookupDone = true;
361  CD.II = &getState()->getStateManager().getContext().Idents.get(
362  CD.getFunctionName());
363  }
364  const IdentifierInfo *II = getCalleeIdentifier();
365  if (!II || II != CD.II)
366  return false;
367 
368  const Decl *D = getDecl();
369  // If CallDescription provides prefix names, use them to improve matching
370  // accuracy.
371  if (CD.QualifiedName.size() > 1 && D) {
372  const DeclContext *Ctx = D->getDeclContext();
373  // See if we'll be able to match them all.
374  size_t NumUnmatched = CD.QualifiedName.size() - 1;
375  for (; Ctx && isa<NamedDecl>(Ctx); Ctx = Ctx->getParent()) {
376  if (NumUnmatched == 0)
377  break;
378 
379  if (const auto *ND = dyn_cast<NamespaceDecl>(Ctx)) {
380  if (ND->getName() == CD.QualifiedName[NumUnmatched - 1])
381  --NumUnmatched;
382  continue;
383  }
384 
385  if (const auto *RD = dyn_cast<RecordDecl>(Ctx)) {
386  if (RD->getName() == CD.QualifiedName[NumUnmatched - 1])
387  --NumUnmatched;
388  continue;
389  }
390  }
391 
392  if (NumUnmatched > 0)
393  return false;
394  }
395 
396  return (CD.RequiredArgs == CallDescription::NoArgRequirement ||
397  CD.RequiredArgs == getNumArgs());
398 }
399 
400 SVal CallEvent::getArgSVal(unsigned Index) const {
401  const Expr *ArgE = getArgExpr(Index);
402  if (!ArgE)
403  return UnknownVal();
404  return getSVal(ArgE);
405 }
406 
408  const Expr *ArgE = getArgExpr(Index);
409  if (!ArgE)
410  return {};
411  return ArgE->getSourceRange();
412 }
413 
415  const Expr *E = getOriginExpr();
416  if (!E)
417  return UndefinedVal();
418  return getSVal(E);
419 }
420 
421 LLVM_DUMP_METHOD void CallEvent::dump() const { dump(llvm::errs()); }
422 
423 void CallEvent::dump(raw_ostream &Out) const {
424  ASTContext &Ctx = getState()->getStateManager().getContext();
425  if (const Expr *E = getOriginExpr()) {
426  E->printPretty(Out, nullptr, Ctx.getPrintingPolicy());
427  Out << "\n";
428  return;
429  }
430 
431  if (const Decl *D = getDecl()) {
432  Out << "Call to ";
433  D->print(Out, Ctx.getPrintingPolicy());
434  return;
435  }
436 
437  // FIXME: a string representation of the kind would be nice.
438  Out << "Unknown call (type " << getKind() << ")";
439 }
440 
441 bool CallEvent::isCallStmt(const Stmt *S) {
442  return isa<CallExpr>(S) || isa<ObjCMessageExpr>(S)
443  || isa<CXXConstructExpr>(S)
444  || isa<CXXNewExpr>(S);
445 }
446 
448  assert(D);
449  if (const auto *FD = dyn_cast<FunctionDecl>(D))
450  return FD->getReturnType();
451  if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
452  return MD->getReturnType();
453  if (const auto *BD = dyn_cast<BlockDecl>(D)) {
454  // Blocks are difficult because the return type may not be stored in the
455  // BlockDecl itself. The AST should probably be enhanced, but for now we
456  // just do what we can.
457  // If the block is declared without an explicit argument list, the
458  // signature-as-written just includes the return type, not the entire
459  // function type.
460  // FIXME: All blocks should have signatures-as-written, even if the return
461  // type is inferred. (That's signified with a dependent result type.)
462  if (const TypeSourceInfo *TSI = BD->getSignatureAsWritten()) {
463  QualType Ty = TSI->getType();
464  if (const FunctionType *FT = Ty->getAs<FunctionType>())
465  Ty = FT->getReturnType();
466  if (!Ty->isDependentType())
467  return Ty;
468  }
469 
470  return {};
471  }
472 
473  llvm_unreachable("unknown callable kind");
474 }
475 
476 bool CallEvent::isVariadic(const Decl *D) {
477  assert(D);
478 
479  if (const auto *FD = dyn_cast<FunctionDecl>(D))
480  return FD->isVariadic();
481  if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
482  return MD->isVariadic();
483  if (const auto *BD = dyn_cast<BlockDecl>(D))
484  return BD->isVariadic();
485 
486  llvm_unreachable("unknown callable kind");
487 }
488 
489 static void addParameterValuesToBindings(const StackFrameContext *CalleeCtx,
490  CallEvent::BindingsTy &Bindings,
491  SValBuilder &SVB,
492  const CallEvent &Call,
493  ArrayRef<ParmVarDecl*> parameters) {
494  MemRegionManager &MRMgr = SVB.getRegionManager();
495 
496  // If the function has fewer parameters than the call has arguments, we simply
497  // do not bind any values to them.
498  unsigned NumArgs = Call.getNumArgs();
499  unsigned Idx = 0;
500  ArrayRef<ParmVarDecl*>::iterator I = parameters.begin(), E = parameters.end();
501  for (; I != E && Idx < NumArgs; ++I, ++Idx) {
502  const ParmVarDecl *ParamDecl = *I;
503  assert(ParamDecl && "Formal parameter has no decl?");
504 
505  // TODO: Support allocator calls.
506  if (Call.getKind() != CE_CXXAllocator)
507  if (Call.isArgumentConstructedDirectly(Idx))
508  continue;
509 
510  // TODO: Allocators should receive the correct size and possibly alignment,
511  // determined in compile-time but not represented as arg-expressions,
512  // which makes getArgSVal() fail and return UnknownVal.
513  SVal ArgVal = Call.getArgSVal(Idx);
514  if (!ArgVal.isUnknown()) {
515  Loc ParamLoc = SVB.makeLoc(MRMgr.getVarRegion(ParamDecl, CalleeCtx));
516  Bindings.push_back(std::make_pair(ParamLoc, ArgVal));
517  }
518  }
519 
520  // FIXME: Variadic arguments are not handled at all right now.
521 }
522 
524  const FunctionDecl *D = getDecl();
525  if (!D)
526  return None;
527  return D->parameters();
528 }
529 
531  const FunctionDecl *FD = getDecl();
532  if (!FD)
533  return {};
534 
535  // Note that the AnalysisDeclContext will have the FunctionDecl with
536  // the definition (if one exists).
537  AnalysisDeclContext *AD =
539  getManager()->getContext(FD);
540  bool IsAutosynthesized;
541  Stmt* Body = AD->getBody(IsAutosynthesized);
542  LLVM_DEBUG({
543  if (IsAutosynthesized)
544  llvm::dbgs() << "Using autosynthesized body for " << FD->getName()
545  << "\n";
546  });
547  if (Body) {
548  const Decl* Decl = AD->getDecl();
549  return RuntimeDefinition(Decl);
550  }
551 
552  SubEngine &Engine = getState()->getStateManager().getOwningEngine();
553  AnalyzerOptions &Opts = Engine.getAnalysisManager().options;
554 
555  // Try to get CTU definition only if CTUDir is provided.
556  if (!Opts.IsNaiveCTUEnabled)
557  return {};
558 
561  llvm::Expected<const FunctionDecl *> CTUDeclOrError =
562  CTUCtx.getCrossTUDefinition(FD, Opts.CTUDir, Opts.CTUIndexName,
563  Opts.DisplayCTUProgress);
564 
565  if (!CTUDeclOrError) {
566  handleAllErrors(CTUDeclOrError.takeError(),
567  [&](const cross_tu::IndexError &IE) {
568  CTUCtx.emitCrossTUDiagnostics(IE);
569  });
570  return {};
571  }
572 
573  return RuntimeDefinition(*CTUDeclOrError);
574 }
575 
577  const StackFrameContext *CalleeCtx,
578  BindingsTy &Bindings) const {
579  const auto *D = cast<FunctionDecl>(CalleeCtx->getDecl());
580  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
581  addParameterValuesToBindings(CalleeCtx, Bindings, SVB, *this,
582  D->parameters());
583 }
584 
587  return true;
588 
589  const FunctionDecl *D = getDecl();
590  if (!D)
591  return true;
592 
593  const IdentifierInfo *II = D->getIdentifier();
594  if (!II)
595  return false;
596 
597  // This set of "escaping" APIs is
598 
599  // - 'int pthread_setspecific(ptheread_key k, const void *)' stores a
600  // value into thread local storage. The value can later be retrieved with
601  // 'void *ptheread_getspecific(pthread_key)'. So even thought the
602  // parameter is 'const void *', the region escapes through the call.
603  if (II->isStr("pthread_setspecific"))
604  return true;
605 
606  // - xpc_connection_set_context stores a value which can be retrieved later
607  // with xpc_connection_get_context.
608  if (II->isStr("xpc_connection_set_context"))
609  return true;
610 
611  // - funopen - sets a buffer for future IO calls.
612  if (II->isStr("funopen"))
613  return true;
614 
615  // - __cxa_demangle - can reallocate memory and can return the pointer to
616  // the input buffer.
617  if (II->isStr("__cxa_demangle"))
618  return true;
619 
620  StringRef FName = II->getName();
621 
622  // - CoreFoundation functions that end with "NoCopy" can free a passed-in
623  // buffer even if it is const.
624  if (FName.endswith("NoCopy"))
625  return true;
626 
627  // - NSXXInsertXX, for example NSMapInsertIfAbsent, since they can
628  // be deallocated by NSMapRemove.
629  if (FName.startswith("NS") && (FName.find("Insert") != StringRef::npos))
630  return true;
631 
632  // - Many CF containers allow objects to escape through custom
633  // allocators/deallocators upon container construction. (PR12101)
634  if (FName.startswith("CF") || FName.startswith("CG")) {
635  return StrInStrNoCase(FName, "InsertValue") != StringRef::npos ||
636  StrInStrNoCase(FName, "AddValue") != StringRef::npos ||
637  StrInStrNoCase(FName, "SetValue") != StringRef::npos ||
638  StrInStrNoCase(FName, "WithData") != StringRef::npos ||
639  StrInStrNoCase(FName, "AppendValue") != StringRef::npos ||
640  StrInStrNoCase(FName, "SetAttribute") != StringRef::npos;
641  }
642 
643  return false;
644 }
645 
647  const FunctionDecl *D = getOriginExpr()->getDirectCallee();
648  if (D)
649  return D;
650 
651  return getSVal(getOriginExpr()->getCallee()).getAsFunctionDecl();
652 }
653 
655  const auto *CE = cast_or_null<CallExpr>(getOriginExpr());
656  if (!CE)
657  return AnyFunctionCall::getDecl();
658 
659  const FunctionDecl *D = CE->getDirectCallee();
660  if (D)
661  return D;
662 
663  return getSVal(CE->getCallee()).getAsFunctionDecl();
664 }
665 
667  ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const {
668  SVal ThisVal = getCXXThisVal();
669  Values.push_back(ThisVal);
670 
671  // Don't invalidate if the method is const and there are no mutable fields.
672  if (const auto *D = cast_or_null<CXXMethodDecl>(getDecl())) {
673  if (!D->isConst())
674  return;
675  // Get the record decl for the class of 'This'. D->getParent() may return a
676  // base class decl, rather than the class of the instance which needs to be
677  // checked for mutable fields.
678  // TODO: We might as well look at the dynamic type of the object.
679  const Expr *Ex = getCXXThisExpr()->ignoreParenBaseCasts();
680  QualType T = Ex->getType();
681  if (T->isPointerType()) // Arrow or implicit-this syntax?
682  T = T->getPointeeType();
683  const CXXRecordDecl *ParentRecord = T->getAsCXXRecordDecl();
684  assert(ParentRecord);
685  if (ParentRecord->hasMutableFields())
686  return;
687  // Preserve CXXThis.
688  const MemRegion *ThisRegion = ThisVal.getAsRegion();
689  if (!ThisRegion)
690  return;
691 
692  ETraits->setTrait(ThisRegion->getBaseRegion(),
694  }
695 }
696 
698  const Expr *Base = getCXXThisExpr();
699  // FIXME: This doesn't handle an overloaded ->* operator.
700  if (!Base)
701  return UnknownVal();
702 
703  SVal ThisVal = getSVal(Base);
704  assert(ThisVal.isUnknownOrUndef() || ThisVal.getAs<Loc>());
705  return ThisVal;
706 }
707 
708 RuntimeDefinition CXXInstanceCall::getRuntimeDefinition() const {
709  // Do we have a decl at all?
710  const Decl *D = getDecl();
711  if (!D)
712  return {};
713 
714  // If the method is non-virtual, we know we can inline it.
715  const auto *MD = cast<CXXMethodDecl>(D);
716  if (!MD->isVirtual())
718 
719  // Do we know the implicit 'this' object being called?
720  const MemRegion *R = getCXXThisVal().getAsRegion();
721  if (!R)
722  return {};
723 
724  // Do we know anything about the type of 'this'?
725  DynamicTypeInfo DynType = getDynamicTypeInfo(getState(), R);
726  if (!DynType.isValid())
727  return {};
728 
729  // Is the type a C++ class? (This is mostly a defensive check.)
730  QualType RegionType = DynType.getType()->getPointeeType();
731  assert(!RegionType.isNull() && "DynamicTypeInfo should always be a pointer.");
732 
733  const CXXRecordDecl *RD = RegionType->getAsCXXRecordDecl();
734  if (!RD || !RD->hasDefinition())
735  return {};
736 
737  // Find the decl for this method in that class.
738  const CXXMethodDecl *Result = MD->getCorrespondingMethodInClass(RD, true);
739  if (!Result) {
740  // We might not even get the original statically-resolved method due to
741  // some particularly nasty casting (e.g. casts to sister classes).
742  // However, we should at least be able to search up and down our own class
743  // hierarchy, and some real bugs have been caught by checking this.
744  assert(!RD->isDerivedFrom(MD->getParent()) && "Couldn't find known method");
745 
746  // FIXME: This is checking that our DynamicTypeInfo is at least as good as
747  // the static type. However, because we currently don't update
748  // DynamicTypeInfo when an object is cast, we can't actually be sure the
749  // DynamicTypeInfo is up to date. This assert should be re-enabled once
750  // this is fixed. <rdar://problem/12287087>
751  //assert(!MD->getParent()->isDerivedFrom(RD) && "Bad DynamicTypeInfo");
752 
753  return {};
754  }
755 
756  // Does the decl that we found have an implementation?
757  const FunctionDecl *Definition;
758  if (!Result->hasBody(Definition))
759  return {};
760 
761  // We found a definition. If we're not sure that this devirtualization is
762  // actually what will happen at runtime, make sure to provide the region so
763  // that ExprEngine can decide what to do with it.
764  if (DynType.canBeASubClass())
765  return RuntimeDefinition(Definition, R->StripCasts());
766  return RuntimeDefinition(Definition, /*DispatchRegion=*/nullptr);
767 }
768 
770  const StackFrameContext *CalleeCtx,
771  BindingsTy &Bindings) const {
773 
774  // Handle the binding of 'this' in the new stack frame.
775  SVal ThisVal = getCXXThisVal();
776  if (!ThisVal.isUnknown()) {
777  ProgramStateManager &StateMgr = getState()->getStateManager();
778  SValBuilder &SVB = StateMgr.getSValBuilder();
779 
780  const auto *MD = cast<CXXMethodDecl>(CalleeCtx->getDecl());
781  Loc ThisLoc = SVB.getCXXThis(MD, CalleeCtx);
782 
783  // If we devirtualized to a different member function, we need to make sure
784  // we have the proper layering of CXXBaseObjectRegions.
785  if (MD->getCanonicalDecl() != getDecl()->getCanonicalDecl()) {
786  ASTContext &Ctx = SVB.getContext();
787  const CXXRecordDecl *Class = MD->getParent();
788  QualType Ty = Ctx.getPointerType(Ctx.getRecordType(Class));
789 
790  // FIXME: CallEvent maybe shouldn't be directly accessing StoreManager.
791  bool Failed;
792  ThisVal = StateMgr.getStoreManager().attemptDownCast(ThisVal, Ty, Failed);
793  if (Failed) {
794  // We might have suffered some sort of placement new earlier, so
795  // we're constructing in a completely unexpected storage.
796  // Fall back to a generic pointer cast for this-value.
797  const CXXMethodDecl *StaticMD = cast<CXXMethodDecl>(getDecl());
798  const CXXRecordDecl *StaticClass = StaticMD->getParent();
799  QualType StaticTy = Ctx.getPointerType(Ctx.getRecordType(StaticClass));
800  ThisVal = SVB.evalCast(ThisVal, Ty, StaticTy);
801  }
802  }
803 
804  if (!ThisVal.isUnknown())
805  Bindings.push_back(std::make_pair(ThisLoc, ThisVal));
806  }
807 }
808 
810  return getOriginExpr()->getImplicitObjectArgument();
811 }
812 
813 RuntimeDefinition CXXMemberCall::getRuntimeDefinition() const {
814  // C++11 [expr.call]p1: ...If the selected function is non-virtual, or if the
815  // id-expression in the class member access expression is a qualified-id,
816  // that function is called. Otherwise, its final overrider in the dynamic type
817  // of the object expression is called.
818  if (const auto *ME = dyn_cast<MemberExpr>(getOriginExpr()->getCallee()))
819  if (ME->hasQualifier())
821 
823 }
824 
826  return getOriginExpr()->getArg(0);
827 }
828 
829 const BlockDataRegion *BlockCall::getBlockRegion() const {
830  const Expr *Callee = getOriginExpr()->getCallee();
831  const MemRegion *DataReg = getSVal(Callee).getAsRegion();
832 
833  return dyn_cast_or_null<BlockDataRegion>(DataReg);
834 }
835 
837  const BlockDecl *D = getDecl();
838  if (!D)
839  return None;
840  return D->parameters();
841 }
842 
844  RegionAndSymbolInvalidationTraits *ETraits) const {
845  // FIXME: This also needs to invalidate captured globals.
846  if (const MemRegion *R = getBlockRegion())
847  Values.push_back(loc::MemRegionVal(R));
848 }
849 
851  BindingsTy &Bindings) const {
852  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
853  ArrayRef<ParmVarDecl*> Params;
854  if (isConversionFromLambda()) {
855  auto *LambdaOperatorDecl = cast<CXXMethodDecl>(CalleeCtx->getDecl());
856  Params = LambdaOperatorDecl->parameters();
857 
858  // For blocks converted from a C++ lambda, the callee declaration is the
859  // operator() method on the lambda so we bind "this" to
860  // the lambda captured by the block.
861  const VarRegion *CapturedLambdaRegion = getRegionStoringCapturedLambda();
862  SVal ThisVal = loc::MemRegionVal(CapturedLambdaRegion);
863  Loc ThisLoc = SVB.getCXXThis(LambdaOperatorDecl, CalleeCtx);
864  Bindings.push_back(std::make_pair(ThisLoc, ThisVal));
865  } else {
866  Params = cast<BlockDecl>(CalleeCtx->getDecl())->parameters();
867  }
868 
869  addParameterValuesToBindings(CalleeCtx, Bindings, SVB, *this,
870  Params);
871 }
872 
874  if (Data)
875  return loc::MemRegionVal(static_cast<const MemRegion *>(Data));
876  return UnknownVal();
877 }
878 
880  RegionAndSymbolInvalidationTraits *ETraits) const {
881  if (Data) {
882  loc::MemRegionVal MV(static_cast<const MemRegion *>(Data));
883  if (SymbolRef Sym = MV.getAsSymbol(true))
884  ETraits->setTrait(Sym,
886  Values.push_back(MV);
887  }
888 }
889 
891  const StackFrameContext *CalleeCtx,
892  BindingsTy &Bindings) const {
894 
895  SVal ThisVal = getCXXThisVal();
896  if (!ThisVal.isUnknown()) {
897  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
898  const auto *MD = cast<CXXMethodDecl>(CalleeCtx->getDecl());
899  Loc ThisLoc = SVB.getCXXThis(MD, CalleeCtx);
900  Bindings.push_back(std::make_pair(ThisLoc, ThisVal));
901  }
902 }
903 
905  if (Data)
906  return loc::MemRegionVal(DtorDataTy::getFromOpaqueValue(Data).getPointer());
907  return UnknownVal();
908 }
909 
910 RuntimeDefinition CXXDestructorCall::getRuntimeDefinition() const {
911  // Base destructors are always called non-virtually.
912  // Skip CXXInstanceCall's devirtualization logic in this case.
913  if (isBaseDestructor())
915 
917 }
918 
920  const ObjCMethodDecl *D = getDecl();
921  if (!D)
922  return None;
923  return D->parameters();
924 }
925 
927  ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const {
928 
929  // If the method call is a setter for property known to be backed by
930  // an instance variable, don't invalidate the entire receiver, just
931  // the storage for that instance variable.
932  if (const ObjCPropertyDecl *PropDecl = getAccessedProperty()) {
933  if (const ObjCIvarDecl *PropIvar = PropDecl->getPropertyIvarDecl()) {
934  SVal IvarLVal = getState()->getLValue(PropIvar, getReceiverSVal());
935  if (const MemRegion *IvarRegion = IvarLVal.getAsRegion()) {
936  ETraits->setTrait(
937  IvarRegion,
939  ETraits->setTrait(
940  IvarRegion,
942  Values.push_back(IvarLVal);
943  }
944  return;
945  }
946  }
947 
948  Values.push_back(getReceiverSVal());
949 }
950 
952  const LocationContext *LCtx = getLocationContext();
953  const ImplicitParamDecl *SelfDecl = LCtx->getSelfDecl();
954  if (!SelfDecl)
955  return SVal();
956  return getState()->getSVal(getState()->getRegion(SelfDecl, LCtx));
957 }
958 
960  // FIXME: Is this the best way to handle class receivers?
961  if (!isInstanceMessage())
962  return UnknownVal();
963 
964  if (const Expr *RecE = getOriginExpr()->getInstanceReceiver())
965  return getSVal(RecE);
966 
967  // An instance message with no expression means we are sending to super.
968  // In this case the object reference is the same as 'self'.
969  assert(getOriginExpr()->getReceiverKind() == ObjCMessageExpr::SuperInstance);
970  SVal SelfVal = getSelfSVal();
971  assert(SelfVal.isValid() && "Calling super but not in ObjC method");
972  return SelfVal;
973 }
974 
976  if (getOriginExpr()->getReceiverKind() == ObjCMessageExpr::SuperInstance ||
977  getOriginExpr()->getReceiverKind() == ObjCMessageExpr::SuperClass)
978  return true;
979 
980  if (!isInstanceMessage())
981  return false;
982 
983  SVal RecVal = getSVal(getOriginExpr()->getInstanceReceiver());
984 
985  return (RecVal == getSelfSVal());
986 }
987 
989  switch (getMessageKind()) {
990  case OCM_Message:
991  return getOriginExpr()->getSourceRange();
992  case OCM_PropertyAccess:
993  case OCM_Subscript:
994  return getContainingPseudoObjectExpr()->getSourceRange();
995  }
996  llvm_unreachable("unknown message kind");
997 }
998 
999 using ObjCMessageDataTy = llvm::PointerIntPair<const PseudoObjectExpr *, 2>;
1000 
1001 const PseudoObjectExpr *ObjCMethodCall::getContainingPseudoObjectExpr() const {
1002  assert(Data && "Lazy lookup not yet performed.");
1003  assert(getMessageKind() != OCM_Message && "Explicit message send.");
1004  return ObjCMessageDataTy::getFromOpaqueValue(Data).getPointer();
1005 }
1006 
1007 static const Expr *
1009  const Expr *Syntactic = POE->getSyntacticForm();
1010 
1011  // This handles the funny case of assigning to the result of a getter.
1012  // This can happen if the getter returns a non-const reference.
1013  if (const auto *BO = dyn_cast<BinaryOperator>(Syntactic))
1014  Syntactic = BO->getLHS();
1015 
1016  return Syntactic;
1017 }
1018 
1020  if (!Data) {
1021  // Find the parent, ignoring implicit casts.
1023  const Stmt *S = PM.getParentIgnoreParenCasts(getOriginExpr());
1024 
1025  // Check if parent is a PseudoObjectExpr.
1026  if (const auto *POE = dyn_cast_or_null<PseudoObjectExpr>(S)) {
1027  const Expr *Syntactic = getSyntacticFromForPseudoObjectExpr(POE);
1028 
1029  ObjCMessageKind K;
1030  switch (Syntactic->getStmtClass()) {
1031  case Stmt::ObjCPropertyRefExprClass:
1032  K = OCM_PropertyAccess;
1033  break;
1034  case Stmt::ObjCSubscriptRefExprClass:
1035  K = OCM_Subscript;
1036  break;
1037  default:
1038  // FIXME: Can this ever happen?
1039  K = OCM_Message;
1040  break;
1041  }
1042 
1043  if (K != OCM_Message) {
1044  const_cast<ObjCMethodCall *>(this)->Data
1045  = ObjCMessageDataTy(POE, K).getOpaqueValue();
1046  assert(getMessageKind() == K);
1047  return K;
1048  }
1049  }
1050 
1051  const_cast<ObjCMethodCall *>(this)->Data
1052  = ObjCMessageDataTy(nullptr, 1).getOpaqueValue();
1053  assert(getMessageKind() == OCM_Message);
1054  return OCM_Message;
1055  }
1056 
1057  ObjCMessageDataTy Info = ObjCMessageDataTy::getFromOpaqueValue(Data);
1058  if (!Info.getPointer())
1059  return OCM_Message;
1060  return static_cast<ObjCMessageKind>(Info.getInt());
1061 }
1062 
1064  // Look for properties accessed with property syntax (foo.bar = ...)
1065  if ( getMessageKind() == OCM_PropertyAccess) {
1066  const PseudoObjectExpr *POE = getContainingPseudoObjectExpr();
1067  assert(POE && "Property access without PseudoObjectExpr?");
1068 
1069  const Expr *Syntactic = getSyntacticFromForPseudoObjectExpr(POE);
1070  auto *RefExpr = cast<ObjCPropertyRefExpr>(Syntactic);
1071 
1072  if (RefExpr->isExplicitProperty())
1073  return RefExpr->getExplicitProperty();
1074  }
1075 
1076  // Look for properties accessed with method syntax ([foo setBar:...]).
1077  const ObjCMethodDecl *MD = getDecl();
1078  if (!MD || !MD->isPropertyAccessor())
1079  return nullptr;
1080 
1081  // Note: This is potentially quite slow.
1082  return MD->findPropertyDecl();
1083 }
1084 
1086  Selector Sel) const {
1087  assert(IDecl);
1088  AnalysisManager &AMgr =
1089  getState()->getStateManager().getOwningEngine().getAnalysisManager();
1090  // If the class interface is declared inside the main file, assume it is not
1091  // subcassed.
1092  // TODO: It could actually be subclassed if the subclass is private as well.
1093  // This is probably very rare.
1094  SourceLocation InterfLoc = IDecl->getEndOfDefinitionLoc();
1095  if (InterfLoc.isValid() && AMgr.isInCodeFile(InterfLoc))
1096  return false;
1097 
1098  // Assume that property accessors are not overridden.
1099  if (getMessageKind() == OCM_PropertyAccess)
1100  return false;
1101 
1102  // We assume that if the method is public (declared outside of main file) or
1103  // has a parent which publicly declares the method, the method could be
1104  // overridden in a subclass.
1105 
1106  // Find the first declaration in the class hierarchy that declares
1107  // the selector.
1108  ObjCMethodDecl *D = nullptr;
1109  while (true) {
1110  D = IDecl->lookupMethod(Sel, true);
1111 
1112  // Cannot find a public definition.
1113  if (!D)
1114  return false;
1115 
1116  // If outside the main file,
1117  if (D->getLocation().isValid() && !AMgr.isInCodeFile(D->getLocation()))
1118  return true;
1119 
1120  if (D->isOverriding()) {
1121  // Search in the superclass on the next iteration.
1122  IDecl = D->getClassInterface();
1123  if (!IDecl)
1124  return false;
1125 
1126  IDecl = IDecl->getSuperClass();
1127  if (!IDecl)
1128  return false;
1129 
1130  continue;
1131  }
1132 
1133  return false;
1134  };
1135 
1136  llvm_unreachable("The while loop should always terminate.");
1137 }
1138 
1140  if (!MD)
1141  return MD;
1142 
1143  // Find the redeclaration that defines the method.
1144  if (!MD->hasBody()) {
1145  for (auto I : MD->redecls())
1146  if (I->hasBody())
1147  MD = cast<ObjCMethodDecl>(I);
1148  }
1149  return MD;
1150 }
1151 
1152 static bool isCallToSelfClass(const ObjCMessageExpr *ME) {
1153  const Expr* InstRec = ME->getInstanceReceiver();
1154  if (!InstRec)
1155  return false;
1156  const auto *InstRecIg = dyn_cast<DeclRefExpr>(InstRec->IgnoreParenImpCasts());
1157 
1158  // Check that receiver is called 'self'.
1159  if (!InstRecIg || !InstRecIg->getFoundDecl() ||
1160  !InstRecIg->getFoundDecl()->getName().equals("self"))
1161  return false;
1162 
1163  // Check that the method name is 'class'.
1164  if (ME->getSelector().getNumArgs() != 0 ||
1165  !ME->getSelector().getNameForSlot(0).equals("class"))
1166  return false;
1167 
1168  return true;
1169 }
1170 
1171 RuntimeDefinition ObjCMethodCall::getRuntimeDefinition() const {
1172  const ObjCMessageExpr *E = getOriginExpr();
1173  assert(E);
1174  Selector Sel = E->getSelector();
1175 
1176  if (E->isInstanceMessage()) {
1177  // Find the receiver type.
1178  const ObjCObjectPointerType *ReceiverT = nullptr;
1179  bool CanBeSubClassed = false;
1180  QualType SupersType = E->getSuperType();
1181  const MemRegion *Receiver = nullptr;
1182 
1183  if (!SupersType.isNull()) {
1184  // The receiver is guaranteed to be 'super' in this case.
1185  // Super always means the type of immediate predecessor to the method
1186  // where the call occurs.
1187  ReceiverT = cast<ObjCObjectPointerType>(SupersType);
1188  } else {
1189  Receiver = getReceiverSVal().getAsRegion();
1190  if (!Receiver)
1191  return {};
1192 
1193  DynamicTypeInfo DTI = getDynamicTypeInfo(getState(), Receiver);
1194  if (!DTI.isValid()) {
1195  assert(isa<AllocaRegion>(Receiver) &&
1196  "Unhandled untyped region class!");
1197  return {};
1198  }
1199 
1200  QualType DynType = DTI.getType();
1201  CanBeSubClassed = DTI.canBeASubClass();
1202  ReceiverT = dyn_cast<ObjCObjectPointerType>(DynType.getCanonicalType());
1203 
1204  if (ReceiverT && CanBeSubClassed)
1205  if (ObjCInterfaceDecl *IDecl = ReceiverT->getInterfaceDecl())
1206  if (!canBeOverridenInSubclass(IDecl, Sel))
1207  CanBeSubClassed = false;
1208  }
1209 
1210  // Handle special cases of '[self classMethod]' and
1211  // '[[self class] classMethod]', which are treated by the compiler as
1212  // instance (not class) messages. We will statically dispatch to those.
1213  if (auto *PT = dyn_cast_or_null<ObjCObjectPointerType>(ReceiverT)) {
1214  // For [self classMethod], return the compiler visible declaration.
1215  if (PT->getObjectType()->isObjCClass() &&
1216  Receiver == getSelfSVal().getAsRegion())
1217  return RuntimeDefinition(findDefiningRedecl(E->getMethodDecl()));
1218 
1219  // Similarly, handle [[self class] classMethod].
1220  // TODO: We are currently doing a syntactic match for this pattern with is
1221  // limiting as the test cases in Analysis/inlining/InlineObjCClassMethod.m
1222  // shows. A better way would be to associate the meta type with the symbol
1223  // using the dynamic type info tracking and use it here. We can add a new
1224  // SVal for ObjC 'Class' values that know what interface declaration they
1225  // come from. Then 'self' in a class method would be filled in with
1226  // something meaningful in ObjCMethodCall::getReceiverSVal() and we could
1227  // do proper dynamic dispatch for class methods just like we do for
1228  // instance methods now.
1229  if (E->getInstanceReceiver())
1230  if (const auto *M = dyn_cast<ObjCMessageExpr>(E->getInstanceReceiver()))
1231  if (isCallToSelfClass(M))
1232  return RuntimeDefinition(findDefiningRedecl(E->getMethodDecl()));
1233  }
1234 
1235  // Lookup the instance method implementation.
1236  if (ReceiverT)
1237  if (ObjCInterfaceDecl *IDecl = ReceiverT->getInterfaceDecl()) {
1238  // Repeatedly calling lookupPrivateMethod() is expensive, especially
1239  // when in many cases it returns null. We cache the results so
1240  // that repeated queries on the same ObjCIntefaceDecl and Selector
1241  // don't incur the same cost. On some test cases, we can see the
1242  // same query being issued thousands of times.
1243  //
1244  // NOTE: This cache is essentially a "global" variable, but it
1245  // only gets lazily created when we get here. The value of the
1246  // cache probably comes from it being global across ExprEngines,
1247  // where the same queries may get issued. If we are worried about
1248  // concurrency, or possibly loading/unloading ASTs, etc., we may
1249  // need to revisit this someday. In terms of memory, this table
1250  // stays around until clang quits, which also may be bad if we
1251  // need to release memory.
1252  using PrivateMethodKey = std::pair<const ObjCInterfaceDecl *, Selector>;
1253  using PrivateMethodCache =
1254  llvm::DenseMap<PrivateMethodKey, Optional<const ObjCMethodDecl *>>;
1255 
1256  static PrivateMethodCache PMC;
1257  Optional<const ObjCMethodDecl *> &Val = PMC[std::make_pair(IDecl, Sel)];
1258 
1259  // Query lookupPrivateMethod() if the cache does not hit.
1260  if (!Val.hasValue()) {
1261  Val = IDecl->lookupPrivateMethod(Sel);
1262 
1263  // If the method is a property accessor, we should try to "inline" it
1264  // even if we don't actually have an implementation.
1265  if (!*Val)
1266  if (const ObjCMethodDecl *CompileTimeMD = E->getMethodDecl())
1267  if (CompileTimeMD->isPropertyAccessor()) {
1268  if (!CompileTimeMD->getSelfDecl() &&
1269  isa<ObjCCategoryDecl>(CompileTimeMD->getDeclContext())) {
1270  // If the method is an accessor in a category, and it doesn't
1271  // have a self declaration, first
1272  // try to find the method in a class extension. This
1273  // works around a bug in Sema where multiple accessors
1274  // are synthesized for properties in class
1275  // extensions that are redeclared in a category and the
1276  // the implicit parameters are not filled in for
1277  // the method on the category.
1278  // This ensures we find the accessor in the extension, which
1279  // has the implicit parameters filled in.
1280  auto *ID = CompileTimeMD->getClassInterface();
1281  for (auto *CatDecl : ID->visible_extensions()) {
1282  Val = CatDecl->getMethod(Sel,
1283  CompileTimeMD->isInstanceMethod());
1284  if (*Val)
1285  break;
1286  }
1287  }
1288  if (!*Val)
1289  Val = IDecl->lookupInstanceMethod(Sel);
1290  }
1291  }
1292 
1293  const ObjCMethodDecl *MD = Val.getValue();
1294  if (CanBeSubClassed)
1295  return RuntimeDefinition(MD, Receiver);
1296  else
1297  return RuntimeDefinition(MD, nullptr);
1298  }
1299  } else {
1300  // This is a class method.
1301  // If we have type info for the receiver class, we are calling via
1302  // class name.
1303  if (ObjCInterfaceDecl *IDecl = E->getReceiverInterface()) {
1304  // Find/Return the method implementation.
1305  return RuntimeDefinition(IDecl->lookupPrivateClassMethod(Sel));
1306  }
1307  }
1308 
1309  return {};
1310 }
1311 
1313  if (isInSystemHeader() && !isInstanceMessage()) {
1314  Selector Sel = getSelector();
1315  if (Sel.getNumArgs() == 1 &&
1316  Sel.getIdentifierInfoForSlot(0)->isStr("valueWithPointer"))
1317  return true;
1318  }
1319 
1321 }
1322 
1324  const StackFrameContext *CalleeCtx,
1325  BindingsTy &Bindings) const {
1326  const auto *D = cast<ObjCMethodDecl>(CalleeCtx->getDecl());
1327  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
1328  addParameterValuesToBindings(CalleeCtx, Bindings, SVB, *this,
1329  D->parameters());
1330 
1331  SVal SelfVal = getReceiverSVal();
1332  if (!SelfVal.isUnknown()) {
1333  const VarDecl *SelfD = CalleeCtx->getAnalysisDeclContext()->getSelfDecl();
1334  MemRegionManager &MRMgr = SVB.getRegionManager();
1335  Loc SelfLoc = SVB.makeLoc(MRMgr.getVarRegion(SelfD, CalleeCtx));
1336  Bindings.push_back(std::make_pair(SelfLoc, SelfVal));
1337  }
1338 }
1339 
1340 CallEventRef<>
1342  const LocationContext *LCtx) {
1343  if (const auto *MCE = dyn_cast<CXXMemberCallExpr>(CE))
1344  return create<CXXMemberCall>(MCE, State, LCtx);
1345 
1346  if (const auto *OpCE = dyn_cast<CXXOperatorCallExpr>(CE)) {
1347  const FunctionDecl *DirectCallee = OpCE->getDirectCallee();
1348  if (const auto *MD = dyn_cast<CXXMethodDecl>(DirectCallee))
1349  if (MD->isInstance())
1350  return create<CXXMemberOperatorCall>(OpCE, State, LCtx);
1351 
1352  } else if (CE->getCallee()->getType()->isBlockPointerType()) {
1353  return create<BlockCall>(CE, State, LCtx);
1354  }
1355 
1356  // Otherwise, it's a normal function call, static member function call, or
1357  // something we can't reason about.
1358  return create<SimpleFunctionCall>(CE, State, LCtx);
1359 }
1360 
1361 CallEventRef<>
1363  ProgramStateRef State) {
1364  const LocationContext *ParentCtx = CalleeCtx->getParent();
1365  const LocationContext *CallerCtx = ParentCtx->getStackFrame();
1366  assert(CallerCtx && "This should not be used for top-level stack frames");
1367 
1368  const Stmt *CallSite = CalleeCtx->getCallSite();
1369 
1370  if (CallSite) {
1371  if (CallEventRef<> Out = getCall(CallSite, State, CallerCtx))
1372  return Out;
1373 
1374  // All other cases are handled by getCall.
1375  assert(isa<CXXConstructExpr>(CallSite) &&
1376  "This is not an inlineable statement");
1377 
1378  SValBuilder &SVB = State->getStateManager().getSValBuilder();
1379  const auto *Ctor = cast<CXXMethodDecl>(CalleeCtx->getDecl());
1380  Loc ThisPtr = SVB.getCXXThis(Ctor, CalleeCtx);
1381  SVal ThisVal = State->getSVal(ThisPtr);
1382 
1383  return getCXXConstructorCall(cast<CXXConstructExpr>(CallSite),
1384  ThisVal.getAsRegion(), State, CallerCtx);
1385  }
1386 
1387  // Fall back to the CFG. The only thing we haven't handled yet is
1388  // destructors, though this could change in the future.
1389  const CFGBlock *B = CalleeCtx->getCallSiteBlock();
1390  CFGElement E = (*B)[CalleeCtx->getIndex()];
1391  assert((E.getAs<CFGImplicitDtor>() || E.getAs<CFGTemporaryDtor>()) &&
1392  "All other CFG elements should have exprs");
1393 
1394  SValBuilder &SVB = State->getStateManager().getSValBuilder();
1395  const auto *Dtor = cast<CXXDestructorDecl>(CalleeCtx->getDecl());
1396  Loc ThisPtr = SVB.getCXXThis(Dtor, CalleeCtx);
1397  SVal ThisVal = State->getSVal(ThisPtr);
1398 
1399  const Stmt *Trigger;
1401  Trigger = AutoDtor->getTriggerStmt();
1402  else if (Optional<CFGDeleteDtor> DeleteDtor = E.getAs<CFGDeleteDtor>())
1403  Trigger = DeleteDtor->getDeleteExpr();
1404  else
1405  Trigger = Dtor->getBody();
1406 
1407  return getCXXDestructorCall(Dtor, Trigger, ThisVal.getAsRegion(),
1408  E.getAs<CFGBaseDtor>().hasValue(), State,
1409  CallerCtx);
1410 }
1411 
1412 CallEventRef<> CallEventManager::getCall(const Stmt *S, ProgramStateRef State,
1413  const LocationContext *LC) {
1414  if (const auto *CE = dyn_cast<CallExpr>(S)) {
1415  return getSimpleCall(CE, State, LC);
1416  } else if (const auto *NE = dyn_cast<CXXNewExpr>(S)) {
1417  return getCXXAllocatorCall(NE, State, LC);
1418  } else if (const auto *ME = dyn_cast<ObjCMessageExpr>(S)) {
1419  return getObjCMethodCall(ME, State, LC);
1420  } else {
1421  return nullptr;
1422  }
1423 }
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:951
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:959
void getExtraInvalidatedValues(ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const override
Definition: CallEvent.cpp:879
Represents a function declaration or definition.
Definition: Decl.h:1743
Expr * getSyntacticForm()
Return the syntactic form of this expression, i.e.
Definition: Expr.h:5627
Smart pointer class that efficiently represents Objective-C method names.
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2549
A (possibly-)qualified type.
Definition: Type.h:639
MemRegion - The root abstract class for all memory regions.
Definition: MemRegion.h:94
bool isBlockPointerType() const
Definition: Type.h:6353
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:585
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:1008
Stmt - This represents one statement.
Definition: Stmt.h:65
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:3367
static bool isCallToSelfClass(const ObjCMessageExpr *ME)
Definition: CallEvent.cpp:1152
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
Represents C++ object destructor generated from a call to delete.
Definition: CFG.h:408
SourceRange getSourceRange() const override
Definition: CallEvent.cpp:988
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:1341
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:769
Expr * ignoreParenBaseCasts() LLVM_READONLY
Skip past any parentheses and derived-to-base casts until reaching a fixed point. ...
Definition: Expr.cpp:2831
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:254
Represents a variable declaration or definition.
Definition: Decl.h:812
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6805
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:214
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:825
ArrayRef< ParmVarDecl * > parameters() const override
Return call&#39;s formal parameters.
Definition: CallEvent.cpp:523
Represents a parameter to a function.
Definition: Decl.h:1559
Defines the clang::Expr interface and subclasses for C++ expressions.
void getExtraInvalidatedValues(ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const override
Definition: CallEvent.cpp:843
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:3598
One of these records is kept for each identifier that is lexed.
RuntimeDefinition getRuntimeDefinition() const override
Definition: CallEvent.cpp:813
param_type_iterator param_type_end() const
Definition: CallEvent.h:481
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:3789
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:6357
virtual const Expr * getArgExpr(unsigned Index) const
Returns the expression associated with a given argument.
Definition: CallEvent.h:304
bool isObjCSelType() const
Definition: Type.h:6483
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:117
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:2276
static void addParameterValuesToBindings(const StackFrameContext *CalleeCtx, CallEvent::BindingsTy &Bindings, SValBuilder &SVB, const CallEvent &Call, ArrayRef< ParmVarDecl *> parameters)
Definition: CallEvent.cpp:489
Represents any expression that calls an Objective-C method.
Definition: CallEvent.h:969
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:126
ExprValueKind getValueKind() const
getValueKind - The value kind that this expression produces.
Definition: Expr.h:407
static void findPtrToConstParams(llvm::SmallSet< unsigned, 4 > &PreserveArgs, const CallEvent &Call)
Definition: CallEvent.cpp:273
const clang::PrintingPolicy & getPrintingPolicy() const
Definition: ASTContext.h:654
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:1139
SVal getReturnValue() const
Returns the return value of the call.
Definition: CallEvent.cpp:414
unsigned size() const
Definition: CFG.h:712
const FunctionDecl * getDecl() const override
Returns the declaration of the function or method that will be called.
Definition: CallEvent.h:505
param_type_iterator param_type_begin() const
Returns an iterator over the types of the call&#39;s formal parameters.
Definition: CallEvent.h:477
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:476
virtual Decl * getCanonicalDecl()
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclBase.h:870
virtual ArrayRef< ParmVarDecl * > parameters() const =0
Return call&#39;s formal parameters.
const CFGBlock * getCallSiteBlock() const
SmallVectorImpl< FrameBindingTy > BindingsTy
Definition: CallEvent.h:383
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:809
ObjCMessageKind
Represents the ways an Objective-C message send can occur.
Definition: CallEvent.h:960
bool isReceiverSelfOrSuper() const
Checks if the receiver refers to &#39;self&#39; or &#39;super&#39;.
Definition: CallEvent.cpp:975
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:919
Represents a single basic block in a source-level CFG.
Definition: CFG.h:551
bool argumentsMayEscape() const override
Definition: CallEvent.cpp:1312
ArrayRef< ParmVarDecl * > parameters() const override
Definition: CallEvent.cpp:836
AnalysisDeclContext * getContext(const Decl *D)
const LocationContext * getLocationContext() const
The context in which the call is being evaluated.
Definition: CallEvent.h:244
static bool isCallback(QualType T)
Definition: CallEvent.cpp:96
Represents a block literal declaration, which is like an unnamed FunctionDecl.
Definition: Decl.h:3863
This represents one expression.
Definition: Expr.h:108
void getInitialStackFrameContents(const StackFrameContext *CalleeCtx, BindingsTy &Bindings) const override
Definition: CallEvent.cpp:1323
const FunctionDecl * getDecl() const override
Returns the declaration of the function or method that will be called.
Definition: CallEvent.cpp:646
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:1362
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:2552
llvm::mapped_iterator< ArrayRef< ParmVarDecl * >::iterator, GetTypeFn > param_type_iterator
Definition: CallEvent.h:470
bool isInSystemHeader() const
Returns true if the callee is known to be from a system header.
Definition: CallEvent.h:266
StringRef getNameForSlot(unsigned argIndex) const
Retrieve the name at a given position in the selector.
DeclContext * getDeclContext()
Definition: DeclBase.h:431
ObjCInterfaceDecl * getSuperClass() const
Definition: DeclObjC.cpp:337
virtual SVal getCXXThisVal() const
Returns the value of the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:697
const IdentifierInfo * getCalleeIdentifier() const
Returns the name of the callee, if its name is a simple identifier.
Definition: CallEvent.h:364
StringRef getFunctionName() const
Get the name of the function that this object matches.
Definition: CallEvent.h:105
void getInitialStackFrameContents(const StackFrameContext *CalleeCtx, BindingsTy &Bindings) const override
Definition: CallEvent.cpp:850
bool hasBody(const FunctionDecl *&Definition) const
Returns true if the function has a body.
Definition: Decl.cpp:2751
Defines the clang::IdentifierInfo, clang::IdentifierTable, and clang::Selector interfaces.
QualType getType() const
Definition: Expr.h:130
virtual const Decl * getDecl() const
Returns the declaration of the function or method that will be called.
Definition: CallEvent.h:234
DeclContext * getParent()
getParent - Returns the containing DeclContext.
Definition: DeclBase.h:1763
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:926
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:704
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:335
RuntimeDefinition getRuntimeDefinition() const override
Definition: CallEvent.cpp:708
bool isConstQualified() const
Determine whether this type is const-qualified.
Definition: Type.h:6180
virtual SourceRange getSourceRange() const
Returns a source range for the entire call, suitable for outputting in diagnostics.
Definition: CallEvent.h:295
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:576
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:133
QualType getCanonicalType() const
Definition: Type.h:6160
PseudoObjectExpr - An expression which accesses a pseudo-object l-value.
Definition: Expr.h:5583
This class represents a description of a function call using the number of arguments and the name of ...
Definition: CallEvent.h:77
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:666
Encodes a location in the source.
const FunctionDecl * getDecl() const override
Definition: CallEvent.cpp:654
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:441
ProgramPoints can be "tagged" as representing points specific to a given analysis entity...
Definition: ProgramPoint.h:39
const MemRegion * getAsRegion() const
Definition: SVals.cpp:150
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:433
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:2108
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:1011
const StackFrameContext * getStackFrame() const
Definition: MemRegion.cpp:157
const Decl * getDecl() const
bool isAnyPointerType() const
Definition: Type.h:6349
virtual Optional< unsigned > getAdjustedParameterIndex(unsigned ASTArgumentIndex) const
Some calls have parameter numbering mismatched from argument numbering.
Definition: CallEvent.h:444
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:728
RuntimeDefinition getRuntimeDefinition() const override
Definition: CallEvent.cpp:910
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:222
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:1412
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
static const unsigned NoArgRequirement
Definition: CallEvent.h:88
redecl_range redecls() const
Returns an iterator range for all the redeclarations of the same decl.
Definition: DeclBase.h:941
SVal getCXXThisVal() const
Returns the value of the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:873
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:1085
const BlockDataRegion * getBlockRegion() const
Returns the region associated with this instance of the block.
Definition: CallEvent.cpp:829
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:407
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1264
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:1171
QualType getSuperType() const
Retrieve the type referred to by &#39;super&#39;.
Definition: ExprObjC.h:1336
StmtClass getStmtClass() const
Definition: Stmt.h:1053
bool hasVoidPointerToNonConstArg() const
Returns true if any of the arguments is void*.
Definition: CallEvent.cpp:157
const CXXRecordDecl * getParent() const
Returns the parent of this method declaration, which is the class in which this method is defined...
Definition: DeclCXX.h:2233
bool mayHaveOtherDefinitions()
Check if the definition we have is precise.
Definition: CallEvent.h:154
ObjCMessageKind getMessageKind() const
Returns how the message was written in the source (property access, subscript, or explicit message se...
Definition: CallEvent.cpp:1019
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:2809
Represents a pointer to an Objective C object.
Definition: Type.h:5843
const FunctionDecl * getAsFunctionDecl() const
getAsFunctionDecl - If this SVal is a MemRegionVal and wraps a CodeTextRegion wrapping a FunctionDecl...
Definition: SVals.cpp:62
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4417
ObjCInterfaceDecl * getInterfaceDecl() const
If this pointer points to an Objective @interface type, gets the declaration for that interface...
Definition: Type.h:5899
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:447
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:1366
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:239
Defines the clang::SourceLocation class and associated facilities.
Represents a C++ struct/union/class.
Definition: DeclCXX.h:299
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:6597
SVal getCXXThisVal() const override
Returns the value of the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:904
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:999
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:2434
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:1063
Stmt * getParentIgnoreParenCasts(Stmt *) const
Definition: ParentMap.cpp:133
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:2088
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1074
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:3949
bool isPointerType() const
Definition: Type.h:6345
virtual SVal getArgSVal(unsigned Index) const
Returns the value of a given argument at the time of the call.
Definition: CallEvent.cpp:400
An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:121
const void * Data
Definition: CallEvent.h:181
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:6369
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:530
SourceLocation getLocation() const
Definition: DeclBase.h:422
ArrayRef< ParmVarDecl * > parameters() const
Definition: DeclObjC.h:366
void getInitialStackFrameContents(const StackFrameContext *CalleeCtx, BindingsTy &Bindings) const override
Definition: CallEvent.cpp:890
ArrayRef< SVal > ValueList
const StackFrameContext * getCalleeStackFrame() const
Returns the callee stack frame.
Definition: CallEvent.cpp:194
virtual AnalysisManager & getAnalysisManager()=0