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 (const MemRegion *MR = getArgSVal(Idx).getAsRegion()) {
307  bool UseBaseRegion = true;
308  if (const auto *FR = MR->getAs<FieldRegion>()) {
309  if (const auto *TVR = FR->getSuperRegion()->getAs<TypedValueRegion>()) {
310  if (!TVR->getValueType()->isUnionType()) {
312  TK_DoNotInvalidateSuperRegion);
313  UseBaseRegion = false;
314  }
315  }
316  }
317  // todo: factor this out + handle the lower level const pointers.
318  if (PreserveArgs.count(Idx))
319  ETraits.setTrait(
320  UseBaseRegion ? MR->getBaseRegion() : MR,
322  }
323 
324  ValuesToInvalidate.push_back(getArgSVal(Idx));
325 
326  // If a function accepts an object by argument (which would of course be a
327  // temporary that isn't lifetime-extended), invalidate the object itself,
328  // not only other objects reachable from it. This is necessary because the
329  // destructor has access to the temporary object after the call.
330  // TODO: Support placement arguments once we start
331  // constructing them directly.
332  // TODO: This is unnecessary when there's no destructor, but that's
333  // currently hard to figure out.
334  if (getKind() != CE_CXXAllocator)
336  if (auto AdjIdx = getAdjustedParameterIndex(Idx))
337  if (const VarRegion *VR = getParameterLocation(*AdjIdx))
338  ValuesToInvalidate.push_back(loc::MemRegionVal(VR));
339  }
340 
341  // Invalidate designated regions using the batch invalidation API.
342  // NOTE: Even if RegionsToInvalidate is empty, we may still invalidate
343  // global variables.
344  return Result->invalidateRegions(ValuesToInvalidate, getOriginExpr(),
345  BlockCount, getLocationContext(),
346  /*CausedByPointerEscape*/ true,
347  /*Symbols=*/nullptr, this, &ETraits);
348 }
349 
351  const ProgramPointTag *Tag) const {
352  if (const Expr *E = getOriginExpr()) {
353  if (IsPreVisit)
354  return PreStmt(E, getLocationContext(), Tag);
355  return PostStmt(E, getLocationContext(), Tag);
356  }
357 
358  const Decl *D = getDecl();
359  assert(D && "Cannot get a program point without a statement or decl");
360 
362  if (IsPreVisit)
363  return PreImplicitCall(D, Loc, getLocationContext(), Tag);
364  return PostImplicitCall(D, Loc, getLocationContext(), Tag);
365 }
366 
367 bool CallEvent::isCalled(const CallDescription &CD) const {
368  // FIXME: Add ObjC Message support.
369  if (getKind() == CE_ObjCMessage)
370  return false;
371  if (!CD.IsLookupDone) {
372  CD.IsLookupDone = true;
373  CD.II = &getState()->getStateManager().getContext().Idents.get(
374  CD.getFunctionName());
375  }
376  const IdentifierInfo *II = getCalleeIdentifier();
377  if (!II || II != CD.II)
378  return false;
379 
380  const Decl *D = getDecl();
381  // If CallDescription provides prefix names, use them to improve matching
382  // accuracy.
383  if (CD.QualifiedName.size() > 1 && D) {
384  const DeclContext *Ctx = D->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 == CallDescription::NoArgRequirement ||
409  CD.RequiredArgs == getNumArgs());
410 }
411 
412 SVal CallEvent::getArgSVal(unsigned Index) const {
413  const Expr *ArgE = getArgExpr(Index);
414  if (!ArgE)
415  return UnknownVal();
416  return getSVal(ArgE);
417 }
418 
420  const Expr *ArgE = getArgExpr(Index);
421  if (!ArgE)
422  return {};
423  return ArgE->getSourceRange();
424 }
425 
427  const Expr *E = getOriginExpr();
428  if (!E)
429  return UndefinedVal();
430  return getSVal(E);
431 }
432 
433 LLVM_DUMP_METHOD void CallEvent::dump() const { dump(llvm::errs()); }
434 
435 void CallEvent::dump(raw_ostream &Out) const {
436  ASTContext &Ctx = getState()->getStateManager().getContext();
437  if (const Expr *E = getOriginExpr()) {
438  E->printPretty(Out, nullptr, Ctx.getPrintingPolicy());
439  Out << "\n";
440  return;
441  }
442 
443  if (const Decl *D = getDecl()) {
444  Out << "Call to ";
445  D->print(Out, Ctx.getPrintingPolicy());
446  return;
447  }
448 
449  // FIXME: a string representation of the kind would be nice.
450  Out << "Unknown call (type " << getKind() << ")";
451 }
452 
453 bool CallEvent::isCallStmt(const Stmt *S) {
454  return isa<CallExpr>(S) || isa<ObjCMessageExpr>(S)
455  || isa<CXXConstructExpr>(S)
456  || isa<CXXNewExpr>(S);
457 }
458 
460  assert(D);
461  if (const auto *FD = dyn_cast<FunctionDecl>(D))
462  return FD->getReturnType();
463  if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
464  return MD->getReturnType();
465  if (const auto *BD = dyn_cast<BlockDecl>(D)) {
466  // Blocks are difficult because the return type may not be stored in the
467  // BlockDecl itself. The AST should probably be enhanced, but for now we
468  // just do what we can.
469  // If the block is declared without an explicit argument list, the
470  // signature-as-written just includes the return type, not the entire
471  // function type.
472  // FIXME: All blocks should have signatures-as-written, even if the return
473  // type is inferred. (That's signified with a dependent result type.)
474  if (const TypeSourceInfo *TSI = BD->getSignatureAsWritten()) {
475  QualType Ty = TSI->getType();
476  if (const FunctionType *FT = Ty->getAs<FunctionType>())
477  Ty = FT->getReturnType();
478  if (!Ty->isDependentType())
479  return Ty;
480  }
481 
482  return {};
483  }
484 
485  llvm_unreachable("unknown callable kind");
486 }
487 
488 bool CallEvent::isVariadic(const Decl *D) {
489  assert(D);
490 
491  if (const auto *FD = dyn_cast<FunctionDecl>(D))
492  return FD->isVariadic();
493  if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
494  return MD->isVariadic();
495  if (const auto *BD = dyn_cast<BlockDecl>(D))
496  return BD->isVariadic();
497 
498  llvm_unreachable("unknown callable kind");
499 }
500 
501 static void addParameterValuesToBindings(const StackFrameContext *CalleeCtx,
502  CallEvent::BindingsTy &Bindings,
503  SValBuilder &SVB,
504  const CallEvent &Call,
506  MemRegionManager &MRMgr = SVB.getRegionManager();
507 
508  // If the function has fewer parameters than the call has arguments, we simply
509  // do not bind any values to them.
510  unsigned NumArgs = Call.getNumArgs();
511  unsigned Idx = 0;
512  ArrayRef<ParmVarDecl*>::iterator I = parameters.begin(), E = parameters.end();
513  for (; I != E && Idx < NumArgs; ++I, ++Idx) {
514  const ParmVarDecl *ParamDecl = *I;
515  assert(ParamDecl && "Formal parameter has no decl?");
516 
517  // TODO: Support allocator calls.
518  if (Call.getKind() != CE_CXXAllocator)
519  if (Call.isArgumentConstructedDirectly(Idx))
520  continue;
521 
522  // TODO: Allocators should receive the correct size and possibly alignment,
523  // determined in compile-time but not represented as arg-expressions,
524  // which makes getArgSVal() fail and return UnknownVal.
525  SVal ArgVal = Call.getArgSVal(Idx);
526  if (!ArgVal.isUnknown()) {
527  Loc ParamLoc = SVB.makeLoc(MRMgr.getVarRegion(ParamDecl, CalleeCtx));
528  Bindings.push_back(std::make_pair(ParamLoc, ArgVal));
529  }
530  }
531 
532  // FIXME: Variadic arguments are not handled at all right now.
533 }
534 
536  const FunctionDecl *D = getDecl();
537  if (!D)
538  return None;
539  return D->parameters();
540 }
541 
543  const FunctionDecl *FD = getDecl();
544  if (!FD)
545  return {};
546 
547  // Note that the AnalysisDeclContext will have the FunctionDecl with
548  // the definition (if one exists).
549  AnalysisDeclContext *AD =
551  getManager()->getContext(FD);
552  bool IsAutosynthesized;
553  Stmt* Body = AD->getBody(IsAutosynthesized);
554  LLVM_DEBUG({
555  if (IsAutosynthesized)
556  llvm::dbgs() << "Using autosynthesized body for " << FD->getName()
557  << "\n";
558  });
559  if (Body) {
560  const Decl* Decl = AD->getDecl();
561  return RuntimeDefinition(Decl);
562  }
563 
564  SubEngine &Engine = getState()->getStateManager().getOwningEngine();
565  AnalyzerOptions &Opts = Engine.getAnalysisManager().options;
566 
567  // Try to get CTU definition only if CTUDir is provided.
568  if (!Opts.IsNaiveCTUEnabled)
569  return {};
570 
573  llvm::Expected<const FunctionDecl *> CTUDeclOrError =
574  CTUCtx.getCrossTUDefinition(FD, Opts.CTUDir, Opts.CTUIndexName,
575  Opts.DisplayCTUProgress);
576 
577  if (!CTUDeclOrError) {
578  handleAllErrors(CTUDeclOrError.takeError(),
579  [&](const cross_tu::IndexError &IE) {
580  CTUCtx.emitCrossTUDiagnostics(IE);
581  });
582  return {};
583  }
584 
585  return RuntimeDefinition(*CTUDeclOrError);
586 }
587 
589  const StackFrameContext *CalleeCtx,
590  BindingsTy &Bindings) const {
591  const auto *D = cast<FunctionDecl>(CalleeCtx->getDecl());
592  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
593  addParameterValuesToBindings(CalleeCtx, Bindings, SVB, *this,
594  D->parameters());
595 }
596 
599  return true;
600 
601  const FunctionDecl *D = getDecl();
602  if (!D)
603  return true;
604 
605  const IdentifierInfo *II = D->getIdentifier();
606  if (!II)
607  return false;
608 
609  // This set of "escaping" APIs is
610 
611  // - 'int pthread_setspecific(ptheread_key k, const void *)' stores a
612  // value into thread local storage. The value can later be retrieved with
613  // 'void *ptheread_getspecific(pthread_key)'. So even thought the
614  // parameter is 'const void *', the region escapes through the call.
615  if (II->isStr("pthread_setspecific"))
616  return true;
617 
618  // - xpc_connection_set_context stores a value which can be retrieved later
619  // with xpc_connection_get_context.
620  if (II->isStr("xpc_connection_set_context"))
621  return true;
622 
623  // - funopen - sets a buffer for future IO calls.
624  if (II->isStr("funopen"))
625  return true;
626 
627  // - __cxa_demangle - can reallocate memory and can return the pointer to
628  // the input buffer.
629  if (II->isStr("__cxa_demangle"))
630  return true;
631 
632  StringRef FName = II->getName();
633 
634  // - CoreFoundation functions that end with "NoCopy" can free a passed-in
635  // buffer even if it is const.
636  if (FName.endswith("NoCopy"))
637  return true;
638 
639  // - NSXXInsertXX, for example NSMapInsertIfAbsent, since they can
640  // be deallocated by NSMapRemove.
641  if (FName.startswith("NS") && (FName.find("Insert") != StringRef::npos))
642  return true;
643 
644  // - Many CF containers allow objects to escape through custom
645  // allocators/deallocators upon container construction. (PR12101)
646  if (FName.startswith("CF") || FName.startswith("CG")) {
647  return StrInStrNoCase(FName, "InsertValue") != StringRef::npos ||
648  StrInStrNoCase(FName, "AddValue") != StringRef::npos ||
649  StrInStrNoCase(FName, "SetValue") != StringRef::npos ||
650  StrInStrNoCase(FName, "WithData") != StringRef::npos ||
651  StrInStrNoCase(FName, "AppendValue") != StringRef::npos ||
652  StrInStrNoCase(FName, "SetAttribute") != StringRef::npos;
653  }
654 
655  return false;
656 }
657 
659  const FunctionDecl *D = getOriginExpr()->getDirectCallee();
660  if (D)
661  return D;
662 
663  return getSVal(getOriginExpr()->getCallee()).getAsFunctionDecl();
664 }
665 
667  const auto *CE = cast_or_null<CallExpr>(getOriginExpr());
668  if (!CE)
669  return AnyFunctionCall::getDecl();
670 
671  const FunctionDecl *D = CE->getDirectCallee();
672  if (D)
673  return D;
674 
675  return getSVal(CE->getCallee()).getAsFunctionDecl();
676 }
677 
679  ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const {
680  SVal ThisVal = getCXXThisVal();
681  Values.push_back(ThisVal);
682 
683  // Don't invalidate if the method is const and there are no mutable fields.
684  if (const auto *D = cast_or_null<CXXMethodDecl>(getDecl())) {
685  if (!D->isConst())
686  return;
687  // Get the record decl for the class of 'This'. D->getParent() may return a
688  // base class decl, rather than the class of the instance which needs to be
689  // checked for mutable fields.
690  // TODO: We might as well look at the dynamic type of the object.
691  const Expr *Ex = getCXXThisExpr()->ignoreParenBaseCasts();
692  QualType T = Ex->getType();
693  if (T->isPointerType()) // Arrow or implicit-this syntax?
694  T = T->getPointeeType();
695  const CXXRecordDecl *ParentRecord = T->getAsCXXRecordDecl();
696  assert(ParentRecord);
697  if (ParentRecord->hasMutableFields())
698  return;
699  // Preserve CXXThis.
700  const MemRegion *ThisRegion = ThisVal.getAsRegion();
701  if (!ThisRegion)
702  return;
703 
704  ETraits->setTrait(ThisRegion->getBaseRegion(),
706  }
707 }
708 
710  const Expr *Base = getCXXThisExpr();
711  // FIXME: This doesn't handle an overloaded ->* operator.
712  if (!Base)
713  return UnknownVal();
714 
715  SVal ThisVal = getSVal(Base);
716  assert(ThisVal.isUnknownOrUndef() || ThisVal.getAs<Loc>());
717  return ThisVal;
718 }
719 
720 RuntimeDefinition CXXInstanceCall::getRuntimeDefinition() const {
721  // Do we have a decl at all?
722  const Decl *D = getDecl();
723  if (!D)
724  return {};
725 
726  // If the method is non-virtual, we know we can inline it.
727  const auto *MD = cast<CXXMethodDecl>(D);
728  if (!MD->isVirtual())
730 
731  // Do we know the implicit 'this' object being called?
732  const MemRegion *R = getCXXThisVal().getAsRegion();
733  if (!R)
734  return {};
735 
736  // Do we know anything about the type of 'this'?
737  DynamicTypeInfo DynType = getDynamicTypeInfo(getState(), R);
738  if (!DynType.isValid())
739  return {};
740 
741  // Is the type a C++ class? (This is mostly a defensive check.)
742  QualType RegionType = DynType.getType()->getPointeeType();
743  assert(!RegionType.isNull() && "DynamicTypeInfo should always be a pointer.");
744 
745  const CXXRecordDecl *RD = RegionType->getAsCXXRecordDecl();
746  if (!RD || !RD->hasDefinition())
747  return {};
748 
749  // Find the decl for this method in that class.
750  const CXXMethodDecl *Result = MD->getCorrespondingMethodInClass(RD, true);
751  if (!Result) {
752  // We might not even get the original statically-resolved method due to
753  // some particularly nasty casting (e.g. casts to sister classes).
754  // However, we should at least be able to search up and down our own class
755  // hierarchy, and some real bugs have been caught by checking this.
756  assert(!RD->isDerivedFrom(MD->getParent()) && "Couldn't find known method");
757 
758  // FIXME: This is checking that our DynamicTypeInfo is at least as good as
759  // the static type. However, because we currently don't update
760  // DynamicTypeInfo when an object is cast, we can't actually be sure the
761  // DynamicTypeInfo is up to date. This assert should be re-enabled once
762  // this is fixed. <rdar://problem/12287087>
763  //assert(!MD->getParent()->isDerivedFrom(RD) && "Bad DynamicTypeInfo");
764 
765  return {};
766  }
767 
768  // Does the decl that we found have an implementation?
769  const FunctionDecl *Definition;
770  if (!Result->hasBody(Definition))
771  return {};
772 
773  // We found a definition. If we're not sure that this devirtualization is
774  // actually what will happen at runtime, make sure to provide the region so
775  // that ExprEngine can decide what to do with it.
776  if (DynType.canBeASubClass())
777  return RuntimeDefinition(Definition, R->StripCasts());
778  return RuntimeDefinition(Definition, /*DispatchRegion=*/nullptr);
779 }
780 
782  const StackFrameContext *CalleeCtx,
783  BindingsTy &Bindings) const {
785 
786  // Handle the binding of 'this' in the new stack frame.
787  SVal ThisVal = getCXXThisVal();
788  if (!ThisVal.isUnknown()) {
789  ProgramStateManager &StateMgr = getState()->getStateManager();
790  SValBuilder &SVB = StateMgr.getSValBuilder();
791 
792  const auto *MD = cast<CXXMethodDecl>(CalleeCtx->getDecl());
793  Loc ThisLoc = SVB.getCXXThis(MD, CalleeCtx);
794 
795  // If we devirtualized to a different member function, we need to make sure
796  // we have the proper layering of CXXBaseObjectRegions.
797  if (MD->getCanonicalDecl() != getDecl()->getCanonicalDecl()) {
798  ASTContext &Ctx = SVB.getContext();
799  const CXXRecordDecl *Class = MD->getParent();
800  QualType Ty = Ctx.getPointerType(Ctx.getRecordType(Class));
801 
802  // FIXME: CallEvent maybe shouldn't be directly accessing StoreManager.
803  bool Failed;
804  ThisVal = StateMgr.getStoreManager().attemptDownCast(ThisVal, Ty, Failed);
805  if (Failed) {
806  // We might have suffered some sort of placement new earlier, so
807  // we're constructing in a completely unexpected storage.
808  // Fall back to a generic pointer cast for this-value.
809  const CXXMethodDecl *StaticMD = cast<CXXMethodDecl>(getDecl());
810  const CXXRecordDecl *StaticClass = StaticMD->getParent();
811  QualType StaticTy = Ctx.getPointerType(Ctx.getRecordType(StaticClass));
812  ThisVal = SVB.evalCast(ThisVal, Ty, StaticTy);
813  }
814  }
815 
816  if (!ThisVal.isUnknown())
817  Bindings.push_back(std::make_pair(ThisLoc, ThisVal));
818  }
819 }
820 
822  return getOriginExpr()->getImplicitObjectArgument();
823 }
824 
825 RuntimeDefinition CXXMemberCall::getRuntimeDefinition() const {
826  // C++11 [expr.call]p1: ...If the selected function is non-virtual, or if the
827  // id-expression in the class member access expression is a qualified-id,
828  // that function is called. Otherwise, its final overrider in the dynamic type
829  // of the object expression is called.
830  if (const auto *ME = dyn_cast<MemberExpr>(getOriginExpr()->getCallee()))
831  if (ME->hasQualifier())
833 
835 }
836 
838  return getOriginExpr()->getArg(0);
839 }
840 
841 const BlockDataRegion *BlockCall::getBlockRegion() const {
842  const Expr *Callee = getOriginExpr()->getCallee();
843  const MemRegion *DataReg = getSVal(Callee).getAsRegion();
844 
845  return dyn_cast_or_null<BlockDataRegion>(DataReg);
846 }
847 
849  const BlockDecl *D = getDecl();
850  if (!D)
851  return None;
852  return D->parameters();
853 }
854 
856  RegionAndSymbolInvalidationTraits *ETraits) const {
857  // FIXME: This also needs to invalidate captured globals.
858  if (const MemRegion *R = getBlockRegion())
859  Values.push_back(loc::MemRegionVal(R));
860 }
861 
863  BindingsTy &Bindings) const {
864  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
865  ArrayRef<ParmVarDecl*> Params;
866  if (isConversionFromLambda()) {
867  auto *LambdaOperatorDecl = cast<CXXMethodDecl>(CalleeCtx->getDecl());
868  Params = LambdaOperatorDecl->parameters();
869 
870  // For blocks converted from a C++ lambda, the callee declaration is the
871  // operator() method on the lambda so we bind "this" to
872  // the lambda captured by the block.
873  const VarRegion *CapturedLambdaRegion = getRegionStoringCapturedLambda();
874  SVal ThisVal = loc::MemRegionVal(CapturedLambdaRegion);
875  Loc ThisLoc = SVB.getCXXThis(LambdaOperatorDecl, CalleeCtx);
876  Bindings.push_back(std::make_pair(ThisLoc, ThisVal));
877  } else {
878  Params = cast<BlockDecl>(CalleeCtx->getDecl())->parameters();
879  }
880 
881  addParameterValuesToBindings(CalleeCtx, Bindings, SVB, *this,
882  Params);
883 }
884 
886  if (Data)
887  return loc::MemRegionVal(static_cast<const MemRegion *>(Data));
888  return UnknownVal();
889 }
890 
892  RegionAndSymbolInvalidationTraits *ETraits) const {
893  if (Data) {
894  loc::MemRegionVal MV(static_cast<const MemRegion *>(Data));
895  if (SymbolRef Sym = MV.getAsSymbol(true))
896  ETraits->setTrait(Sym,
898  Values.push_back(MV);
899  }
900 }
901 
903  const StackFrameContext *CalleeCtx,
904  BindingsTy &Bindings) const {
906 
907  SVal ThisVal = getCXXThisVal();
908  if (!ThisVal.isUnknown()) {
909  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
910  const auto *MD = cast<CXXMethodDecl>(CalleeCtx->getDecl());
911  Loc ThisLoc = SVB.getCXXThis(MD, CalleeCtx);
912  Bindings.push_back(std::make_pair(ThisLoc, ThisVal));
913  }
914 }
915 
917  if (Data)
918  return loc::MemRegionVal(DtorDataTy::getFromOpaqueValue(Data).getPointer());
919  return UnknownVal();
920 }
921 
922 RuntimeDefinition CXXDestructorCall::getRuntimeDefinition() const {
923  // Base destructors are always called non-virtually.
924  // Skip CXXInstanceCall's devirtualization logic in this case.
925  if (isBaseDestructor())
927 
929 }
930 
932  const ObjCMethodDecl *D = getDecl();
933  if (!D)
934  return None;
935  return D->parameters();
936 }
937 
939  ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const {
940 
941  // If the method call is a setter for property known to be backed by
942  // an instance variable, don't invalidate the entire receiver, just
943  // the storage for that instance variable.
944  if (const ObjCPropertyDecl *PropDecl = getAccessedProperty()) {
945  if (const ObjCIvarDecl *PropIvar = PropDecl->getPropertyIvarDecl()) {
946  SVal IvarLVal = getState()->getLValue(PropIvar, getReceiverSVal());
947  if (const MemRegion *IvarRegion = IvarLVal.getAsRegion()) {
948  ETraits->setTrait(
949  IvarRegion,
951  ETraits->setTrait(
952  IvarRegion,
954  Values.push_back(IvarLVal);
955  }
956  return;
957  }
958  }
959 
960  Values.push_back(getReceiverSVal());
961 }
962 
964  const LocationContext *LCtx = getLocationContext();
965  const ImplicitParamDecl *SelfDecl = LCtx->getSelfDecl();
966  if (!SelfDecl)
967  return SVal();
968  return getState()->getSVal(getState()->getRegion(SelfDecl, LCtx));
969 }
970 
972  // FIXME: Is this the best way to handle class receivers?
973  if (!isInstanceMessage())
974  return UnknownVal();
975 
976  if (const Expr *RecE = getOriginExpr()->getInstanceReceiver())
977  return getSVal(RecE);
978 
979  // An instance message with no expression means we are sending to super.
980  // In this case the object reference is the same as 'self'.
981  assert(getOriginExpr()->getReceiverKind() == ObjCMessageExpr::SuperInstance);
982  SVal SelfVal = getSelfSVal();
983  assert(SelfVal.isValid() && "Calling super but not in ObjC method");
984  return SelfVal;
985 }
986 
988  if (getOriginExpr()->getReceiverKind() == ObjCMessageExpr::SuperInstance ||
989  getOriginExpr()->getReceiverKind() == ObjCMessageExpr::SuperClass)
990  return true;
991 
992  if (!isInstanceMessage())
993  return false;
994 
995  SVal RecVal = getSVal(getOriginExpr()->getInstanceReceiver());
996 
997  return (RecVal == getSelfSVal());
998 }
999 
1001  switch (getMessageKind()) {
1002  case OCM_Message:
1003  return getOriginExpr()->getSourceRange();
1004  case OCM_PropertyAccess:
1005  case OCM_Subscript:
1006  return getContainingPseudoObjectExpr()->getSourceRange();
1007  }
1008  llvm_unreachable("unknown message kind");
1009 }
1010 
1011 using ObjCMessageDataTy = llvm::PointerIntPair<const PseudoObjectExpr *, 2>;
1012 
1013 const PseudoObjectExpr *ObjCMethodCall::getContainingPseudoObjectExpr() const {
1014  assert(Data && "Lazy lookup not yet performed.");
1015  assert(getMessageKind() != OCM_Message && "Explicit message send.");
1016  return ObjCMessageDataTy::getFromOpaqueValue(Data).getPointer();
1017 }
1018 
1019 static const Expr *
1021  const Expr *Syntactic = POE->getSyntacticForm();
1022 
1023  // This handles the funny case of assigning to the result of a getter.
1024  // This can happen if the getter returns a non-const reference.
1025  if (const auto *BO = dyn_cast<BinaryOperator>(Syntactic))
1026  Syntactic = BO->getLHS();
1027 
1028  return Syntactic;
1029 }
1030 
1032  if (!Data) {
1033  // Find the parent, ignoring implicit casts.
1035  const Stmt *S = PM.getParentIgnoreParenCasts(getOriginExpr());
1036 
1037  // Check if parent is a PseudoObjectExpr.
1038  if (const auto *POE = dyn_cast_or_null<PseudoObjectExpr>(S)) {
1039  const Expr *Syntactic = getSyntacticFromForPseudoObjectExpr(POE);
1040 
1041  ObjCMessageKind K;
1042  switch (Syntactic->getStmtClass()) {
1043  case Stmt::ObjCPropertyRefExprClass:
1044  K = OCM_PropertyAccess;
1045  break;
1046  case Stmt::ObjCSubscriptRefExprClass:
1047  K = OCM_Subscript;
1048  break;
1049  default:
1050  // FIXME: Can this ever happen?
1051  K = OCM_Message;
1052  break;
1053  }
1054 
1055  if (K != OCM_Message) {
1056  const_cast<ObjCMethodCall *>(this)->Data
1057  = ObjCMessageDataTy(POE, K).getOpaqueValue();
1058  assert(getMessageKind() == K);
1059  return K;
1060  }
1061  }
1062 
1063  const_cast<ObjCMethodCall *>(this)->Data
1064  = ObjCMessageDataTy(nullptr, 1).getOpaqueValue();
1065  assert(getMessageKind() == OCM_Message);
1066  return OCM_Message;
1067  }
1068 
1069  ObjCMessageDataTy Info = ObjCMessageDataTy::getFromOpaqueValue(Data);
1070  if (!Info.getPointer())
1071  return OCM_Message;
1072  return static_cast<ObjCMessageKind>(Info.getInt());
1073 }
1074 
1076  // Look for properties accessed with property syntax (foo.bar = ...)
1077  if ( getMessageKind() == OCM_PropertyAccess) {
1078  const PseudoObjectExpr *POE = getContainingPseudoObjectExpr();
1079  assert(POE && "Property access without PseudoObjectExpr?");
1080 
1081  const Expr *Syntactic = getSyntacticFromForPseudoObjectExpr(POE);
1082  auto *RefExpr = cast<ObjCPropertyRefExpr>(Syntactic);
1083 
1084  if (RefExpr->isExplicitProperty())
1085  return RefExpr->getExplicitProperty();
1086  }
1087 
1088  // Look for properties accessed with method syntax ([foo setBar:...]).
1089  const ObjCMethodDecl *MD = getDecl();
1090  if (!MD || !MD->isPropertyAccessor())
1091  return nullptr;
1092 
1093  // Note: This is potentially quite slow.
1094  return MD->findPropertyDecl();
1095 }
1096 
1098  Selector Sel) const {
1099  assert(IDecl);
1100  AnalysisManager &AMgr =
1101  getState()->getStateManager().getOwningEngine().getAnalysisManager();
1102  // If the class interface is declared inside the main file, assume it is not
1103  // subcassed.
1104  // TODO: It could actually be subclassed if the subclass is private as well.
1105  // This is probably very rare.
1106  SourceLocation InterfLoc = IDecl->getEndOfDefinitionLoc();
1107  if (InterfLoc.isValid() && AMgr.isInCodeFile(InterfLoc))
1108  return false;
1109 
1110  // Assume that property accessors are not overridden.
1111  if (getMessageKind() == OCM_PropertyAccess)
1112  return false;
1113 
1114  // We assume that if the method is public (declared outside of main file) or
1115  // has a parent which publicly declares the method, the method could be
1116  // overridden in a subclass.
1117 
1118  // Find the first declaration in the class hierarchy that declares
1119  // the selector.
1120  ObjCMethodDecl *D = nullptr;
1121  while (true) {
1122  D = IDecl->lookupMethod(Sel, true);
1123 
1124  // Cannot find a public definition.
1125  if (!D)
1126  return false;
1127 
1128  // If outside the main file,
1129  if (D->getLocation().isValid() && !AMgr.isInCodeFile(D->getLocation()))
1130  return true;
1131 
1132  if (D->isOverriding()) {
1133  // Search in the superclass on the next iteration.
1134  IDecl = D->getClassInterface();
1135  if (!IDecl)
1136  return false;
1137 
1138  IDecl = IDecl->getSuperClass();
1139  if (!IDecl)
1140  return false;
1141 
1142  continue;
1143  }
1144 
1145  return false;
1146  };
1147 
1148  llvm_unreachable("The while loop should always terminate.");
1149 }
1150 
1152  if (!MD)
1153  return MD;
1154 
1155  // Find the redeclaration that defines the method.
1156  if (!MD->hasBody()) {
1157  for (auto I : MD->redecls())
1158  if (I->hasBody())
1159  MD = cast<ObjCMethodDecl>(I);
1160  }
1161  return MD;
1162 }
1163 
1164 static bool isCallToSelfClass(const ObjCMessageExpr *ME) {
1165  const Expr* InstRec = ME->getInstanceReceiver();
1166  if (!InstRec)
1167  return false;
1168  const auto *InstRecIg = dyn_cast<DeclRefExpr>(InstRec->IgnoreParenImpCasts());
1169 
1170  // Check that receiver is called 'self'.
1171  if (!InstRecIg || !InstRecIg->getFoundDecl() ||
1172  !InstRecIg->getFoundDecl()->getName().equals("self"))
1173  return false;
1174 
1175  // Check that the method name is 'class'.
1176  if (ME->getSelector().getNumArgs() != 0 ||
1177  !ME->getSelector().getNameForSlot(0).equals("class"))
1178  return false;
1179 
1180  return true;
1181 }
1182 
1183 RuntimeDefinition ObjCMethodCall::getRuntimeDefinition() const {
1184  const ObjCMessageExpr *E = getOriginExpr();
1185  assert(E);
1186  Selector Sel = E->getSelector();
1187 
1188  if (E->isInstanceMessage()) {
1189  // Find the receiver type.
1190  const ObjCObjectPointerType *ReceiverT = nullptr;
1191  bool CanBeSubClassed = false;
1192  QualType SupersType = E->getSuperType();
1193  const MemRegion *Receiver = nullptr;
1194 
1195  if (!SupersType.isNull()) {
1196  // The receiver is guaranteed to be 'super' in this case.
1197  // Super always means the type of immediate predecessor to the method
1198  // where the call occurs.
1199  ReceiverT = cast<ObjCObjectPointerType>(SupersType);
1200  } else {
1201  Receiver = getReceiverSVal().getAsRegion();
1202  if (!Receiver)
1203  return {};
1204 
1205  DynamicTypeInfo DTI = getDynamicTypeInfo(getState(), Receiver);
1206  if (!DTI.isValid()) {
1207  assert(isa<AllocaRegion>(Receiver) &&
1208  "Unhandled untyped region class!");
1209  return {};
1210  }
1211 
1212  QualType DynType = DTI.getType();
1213  CanBeSubClassed = DTI.canBeASubClass();
1214  ReceiverT = dyn_cast<ObjCObjectPointerType>(DynType.getCanonicalType());
1215 
1216  if (ReceiverT && CanBeSubClassed)
1217  if (ObjCInterfaceDecl *IDecl = ReceiverT->getInterfaceDecl())
1218  if (!canBeOverridenInSubclass(IDecl, Sel))
1219  CanBeSubClassed = false;
1220  }
1221 
1222  // Handle special cases of '[self classMethod]' and
1223  // '[[self class] classMethod]', which are treated by the compiler as
1224  // instance (not class) messages. We will statically dispatch to those.
1225  if (auto *PT = dyn_cast_or_null<ObjCObjectPointerType>(ReceiverT)) {
1226  // For [self classMethod], return the compiler visible declaration.
1227  if (PT->getObjectType()->isObjCClass() &&
1228  Receiver == getSelfSVal().getAsRegion())
1229  return RuntimeDefinition(findDefiningRedecl(E->getMethodDecl()));
1230 
1231  // Similarly, handle [[self class] classMethod].
1232  // TODO: We are currently doing a syntactic match for this pattern with is
1233  // limiting as the test cases in Analysis/inlining/InlineObjCClassMethod.m
1234  // shows. A better way would be to associate the meta type with the symbol
1235  // using the dynamic type info tracking and use it here. We can add a new
1236  // SVal for ObjC 'Class' values that know what interface declaration they
1237  // come from. Then 'self' in a class method would be filled in with
1238  // something meaningful in ObjCMethodCall::getReceiverSVal() and we could
1239  // do proper dynamic dispatch for class methods just like we do for
1240  // instance methods now.
1241  if (E->getInstanceReceiver())
1242  if (const auto *M = dyn_cast<ObjCMessageExpr>(E->getInstanceReceiver()))
1243  if (isCallToSelfClass(M))
1244  return RuntimeDefinition(findDefiningRedecl(E->getMethodDecl()));
1245  }
1246 
1247  // Lookup the instance method implementation.
1248  if (ReceiverT)
1249  if (ObjCInterfaceDecl *IDecl = ReceiverT->getInterfaceDecl()) {
1250  // Repeatedly calling lookupPrivateMethod() is expensive, especially
1251  // when in many cases it returns null. We cache the results so
1252  // that repeated queries on the same ObjCIntefaceDecl and Selector
1253  // don't incur the same cost. On some test cases, we can see the
1254  // same query being issued thousands of times.
1255  //
1256  // NOTE: This cache is essentially a "global" variable, but it
1257  // only gets lazily created when we get here. The value of the
1258  // cache probably comes from it being global across ExprEngines,
1259  // where the same queries may get issued. If we are worried about
1260  // concurrency, or possibly loading/unloading ASTs, etc., we may
1261  // need to revisit this someday. In terms of memory, this table
1262  // stays around until clang quits, which also may be bad if we
1263  // need to release memory.
1264  using PrivateMethodKey = std::pair<const ObjCInterfaceDecl *, Selector>;
1265  using PrivateMethodCache =
1266  llvm::DenseMap<PrivateMethodKey, Optional<const ObjCMethodDecl *>>;
1267 
1268  static PrivateMethodCache PMC;
1269  Optional<const ObjCMethodDecl *> &Val = PMC[std::make_pair(IDecl, Sel)];
1270 
1271  // Query lookupPrivateMethod() if the cache does not hit.
1272  if (!Val.hasValue()) {
1273  Val = IDecl->lookupPrivateMethod(Sel);
1274 
1275  // If the method is a property accessor, we should try to "inline" it
1276  // even if we don't actually have an implementation.
1277  if (!*Val)
1278  if (const ObjCMethodDecl *CompileTimeMD = E->getMethodDecl())
1279  if (CompileTimeMD->isPropertyAccessor()) {
1280  if (!CompileTimeMD->getSelfDecl() &&
1281  isa<ObjCCategoryDecl>(CompileTimeMD->getDeclContext())) {
1282  // If the method is an accessor in a category, and it doesn't
1283  // have a self declaration, first
1284  // try to find the method in a class extension. This
1285  // works around a bug in Sema where multiple accessors
1286  // are synthesized for properties in class
1287  // extensions that are redeclared in a category and the
1288  // the implicit parameters are not filled in for
1289  // the method on the category.
1290  // This ensures we find the accessor in the extension, which
1291  // has the implicit parameters filled in.
1292  auto *ID = CompileTimeMD->getClassInterface();
1293  for (auto *CatDecl : ID->visible_extensions()) {
1294  Val = CatDecl->getMethod(Sel,
1295  CompileTimeMD->isInstanceMethod());
1296  if (*Val)
1297  break;
1298  }
1299  }
1300  if (!*Val)
1301  Val = IDecl->lookupInstanceMethod(Sel);
1302  }
1303  }
1304 
1305  const ObjCMethodDecl *MD = Val.getValue();
1306  if (CanBeSubClassed)
1307  return RuntimeDefinition(MD, Receiver);
1308  else
1309  return RuntimeDefinition(MD, nullptr);
1310  }
1311  } else {
1312  // This is a class method.
1313  // If we have type info for the receiver class, we are calling via
1314  // class name.
1315  if (ObjCInterfaceDecl *IDecl = E->getReceiverInterface()) {
1316  // Find/Return the method implementation.
1317  return RuntimeDefinition(IDecl->lookupPrivateClassMethod(Sel));
1318  }
1319  }
1320 
1321  return {};
1322 }
1323 
1325  if (isInSystemHeader() && !isInstanceMessage()) {
1326  Selector Sel = getSelector();
1327  if (Sel.getNumArgs() == 1 &&
1328  Sel.getIdentifierInfoForSlot(0)->isStr("valueWithPointer"))
1329  return true;
1330  }
1331 
1333 }
1334 
1336  const StackFrameContext *CalleeCtx,
1337  BindingsTy &Bindings) const {
1338  const auto *D = cast<ObjCMethodDecl>(CalleeCtx->getDecl());
1339  SValBuilder &SVB = getState()->getStateManager().getSValBuilder();
1340  addParameterValuesToBindings(CalleeCtx, Bindings, SVB, *this,
1341  D->parameters());
1342 
1343  SVal SelfVal = getReceiverSVal();
1344  if (!SelfVal.isUnknown()) {
1345  const VarDecl *SelfD = CalleeCtx->getAnalysisDeclContext()->getSelfDecl();
1346  MemRegionManager &MRMgr = SVB.getRegionManager();
1347  Loc SelfLoc = SVB.makeLoc(MRMgr.getVarRegion(SelfD, CalleeCtx));
1348  Bindings.push_back(std::make_pair(SelfLoc, SelfVal));
1349  }
1350 }
1351 
1352 CallEventRef<>
1354  const LocationContext *LCtx) {
1355  if (const auto *MCE = dyn_cast<CXXMemberCallExpr>(CE))
1356  return create<CXXMemberCall>(MCE, State, LCtx);
1357 
1358  if (const auto *OpCE = dyn_cast<CXXOperatorCallExpr>(CE)) {
1359  const FunctionDecl *DirectCallee = OpCE->getDirectCallee();
1360  if (const auto *MD = dyn_cast<CXXMethodDecl>(DirectCallee))
1361  if (MD->isInstance())
1362  return create<CXXMemberOperatorCall>(OpCE, State, LCtx);
1363 
1364  } else if (CE->getCallee()->getType()->isBlockPointerType()) {
1365  return create<BlockCall>(CE, State, LCtx);
1366  }
1367 
1368  // Otherwise, it's a normal function call, static member function call, or
1369  // something we can't reason about.
1370  return create<SimpleFunctionCall>(CE, State, LCtx);
1371 }
1372 
1373 CallEventRef<>
1375  ProgramStateRef State) {
1376  const LocationContext *ParentCtx = CalleeCtx->getParent();
1377  const LocationContext *CallerCtx = ParentCtx->getStackFrame();
1378  assert(CallerCtx && "This should not be used for top-level stack frames");
1379 
1380  const Stmt *CallSite = CalleeCtx->getCallSite();
1381 
1382  if (CallSite) {
1383  if (CallEventRef<> Out = getCall(CallSite, State, CallerCtx))
1384  return Out;
1385 
1386  // All other cases are handled by getCall.
1387  assert(isa<CXXConstructExpr>(CallSite) &&
1388  "This is not an inlineable statement");
1389 
1390  SValBuilder &SVB = State->getStateManager().getSValBuilder();
1391  const auto *Ctor = cast<CXXMethodDecl>(CalleeCtx->getDecl());
1392  Loc ThisPtr = SVB.getCXXThis(Ctor, CalleeCtx);
1393  SVal ThisVal = State->getSVal(ThisPtr);
1394 
1395  return getCXXConstructorCall(cast<CXXConstructExpr>(CallSite),
1396  ThisVal.getAsRegion(), State, CallerCtx);
1397  }
1398 
1399  // Fall back to the CFG. The only thing we haven't handled yet is
1400  // destructors, though this could change in the future.
1401  const CFGBlock *B = CalleeCtx->getCallSiteBlock();
1402  CFGElement E = (*B)[CalleeCtx->getIndex()];
1403  assert((E.getAs<CFGImplicitDtor>() || E.getAs<CFGTemporaryDtor>()) &&
1404  "All other CFG elements should have exprs");
1405 
1406  SValBuilder &SVB = State->getStateManager().getSValBuilder();
1407  const auto *Dtor = cast<CXXDestructorDecl>(CalleeCtx->getDecl());
1408  Loc ThisPtr = SVB.getCXXThis(Dtor, CalleeCtx);
1409  SVal ThisVal = State->getSVal(ThisPtr);
1410 
1411  const Stmt *Trigger;
1413  Trigger = AutoDtor->getTriggerStmt();
1414  else if (Optional<CFGDeleteDtor> DeleteDtor = E.getAs<CFGDeleteDtor>())
1415  Trigger = DeleteDtor->getDeleteExpr();
1416  else
1417  Trigger = Dtor->getBody();
1418 
1419  return getCXXDestructorCall(Dtor, Trigger, ThisVal.getAsRegion(),
1420  E.getAs<CFGBaseDtor>().hasValue(), State,
1421  CallerCtx);
1422 }
1423 
1424 CallEventRef<> CallEventManager::getCall(const Stmt *S, ProgramStateRef State,
1425  const LocationContext *LC) {
1426  if (const auto *CE = dyn_cast<CallExpr>(S)) {
1427  return getSimpleCall(CE, State, LC);
1428  } else if (const auto *NE = dyn_cast<CXXNewExpr>(S)) {
1429  return getCXXAllocatorCall(NE, State, LC);
1430  } else if (const auto *ME = dyn_cast<ObjCMessageExpr>(S)) {
1431  return getObjCMethodCall(ME, State, LC);
1432  } else {
1433  return nullptr;
1434  }
1435 }
The receiver is the instance of the superclass object.
Definition: ExprObjC.h:1060
Defines the clang::ASTContext interface.
SVal getSelfSVal() const
Return the value of &#39;self&#39; if available.
Definition: CallEvent.cpp:963
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:971
void getExtraInvalidatedValues(ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const override
Definition: CallEvent.cpp:891
Represents a function declaration or definition.
Definition: Decl.h:1737
TypedValueRegion - An abstract class representing regions having a typed value.
Definition: MemRegion.h:529
Expr * getSyntacticForm()
Return the syntactic form of this expression, i.e.
Definition: Expr.h:5550
Smart pointer class that efficiently represents Objective-C method names.
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2547
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:6314
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:597
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:1020
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:350
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3365
static bool isCallToSelfClass(const ObjCMessageExpr *ME)
Definition: CallEvent.cpp:1164
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:86
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:1000
Represents a program point just before an implicit call event.
Definition: ProgramPoint.h:584
A container of type source information.
Definition: Decl.h:86
CallEventRef getSimpleCall(const CallExpr *E, ProgramStateRef State, const LocationContext *LCtx)
Definition: CallEvent.cpp:1353
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:781
Expr * ignoreParenBaseCasts() LLVM_READONLY
Skip past any parentheses and derived-to-base casts until reaching a fixed point. ...
Definition: Expr.cpp:2745
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:6766
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:837
ArrayRef< ParmVarDecl * > parameters() const override
Return call&#39;s formal parameters.
Definition: CallEvent.cpp:535
Represents a parameter to a function.
Definition: Decl.h:1549
Defines the clang::Expr interface and subclasses for C++ expressions.
void getExtraInvalidatedValues(ValueList &Values, RegionAndSymbolInvalidationTraits *ETraits) const override
Definition: CallEvent.cpp:855
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:3592
One of these records is kept for each identifier that is lexed.
RuntimeDefinition getRuntimeDefinition() const override
Definition: CallEvent.cpp:825
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:3783
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:6318
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:6444
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:109
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:2261
static void addParameterValuesToBindings(const StackFrameContext *CalleeCtx, CallEvent::BindingsTy &Bindings, SValBuilder &SVB, const CallEvent &Call, ArrayRef< ParmVarDecl *> parameters)
Definition: CallEvent.cpp:501
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:118
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:653
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:1151
SVal getReturnValue() const
Returns the return value of the call.
Definition: CallEvent.cpp:426
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:488
virtual Decl * getCanonicalDecl()
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclBase.h:872
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:821
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:987
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1635
const Stmt * getCallSite() const
ArrayRef< ParmVarDecl * > parameters() const override
Definition: CallEvent.cpp:931
Represents a single basic block in a source-level CFG.
Definition: CFG.h:551
bool argumentsMayEscape() const override
Definition: CallEvent.cpp:1324
ArrayRef< ParmVarDecl * > parameters() const override
Definition: CallEvent.cpp:848
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:3857
This represents one expression.
Definition: Expr.h:108
void getInitialStackFrameContents(const StackFrameContext *CalleeCtx, BindingsTy &Bindings) const override
Definition: CallEvent.cpp:1335
const FunctionDecl * getDecl() const override
Returns the declaration of the function or method that will be called.
Definition: CallEvent.cpp:658
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:1374
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:2547
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:429
ObjCInterfaceDecl * getSuperClass() const
Definition: DeclObjC.cpp:337
virtual SVal getCXXThisVal() const
Returns the value of the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:709
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:862
bool hasBody(const FunctionDecl *&Definition) const
Returns true if the function has a body.
Definition: Decl.cpp:2694
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:1760
An expression that sends a message to the given Objective-C object or class.
Definition: ExprObjC.h:903
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:938
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:720
bool isConstQualified() const
Determine whether this type is const-qualified.
Definition: Type.h:6141
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:588
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:6121
PseudoObjectExpr - An expression which accesses a pseudo-object l-value.
Definition: Expr.h:5506
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:678
Encodes a location in the source.
const FunctionDecl * getDecl() const override
Definition: CallEvent.cpp:666
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:453
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:2048
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:1015
const StackFrameContext * getStackFrame() const
Definition: MemRegion.cpp:157
const Decl * getDecl() const
bool isAnyPointerType() const
Definition: Type.h:6310
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:922
const ObjCMethodDecl * getMethodDecl() const
Definition: ExprObjC.h:1309
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:1424
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:1213
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:943
SVal getCXXThisVal() const
Returns the value of the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:885
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:1097
const BlockDataRegion * getBlockRegion() const
Returns the region associated with this instance of the block.
Definition: CallEvent.cpp:841
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:419
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1265
Represents a program point just after an implicit call event.
Definition: ProgramPoint.h:601
DynamicTypeInfo getDynamicTypeInfo(ProgramStateRef State, const MemRegion *Reg)
Get dynamic type information for a region.
RuntimeDefinition getRuntimeDefinition() const override
Definition: CallEvent.cpp:1183
QualType getSuperType() const
Retrieve the type referred to by &#39;super&#39;.
Definition: ExprObjC.h:1289
StmtClass getStmtClass() const
Definition: Stmt.h:1041
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:2173
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:1031
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:2723
Represents a pointer to an Objective C object.
Definition: Type.h:5804
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:4380
ObjCInterfaceDecl * getInterfaceDecl() const
If this pointer points to an Objective @interface type, gets the declaration for that interface...
Definition: Type.h:5860
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:459
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 definition from an external AST file and merge it into the original AS...
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:1355
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:6558
SVal getCXXThisVal() const override
Returns the value of the implicit &#39;this&#39; object.
Definition: CallEvent.cpp:916
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:367
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:1011
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:2429
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:1075
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:2086
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1074
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:3943
bool isPointerType() const
Definition: Type.h:6306
virtual SVal getArgSVal(unsigned Index) const
Returns the value of a given argument at the time of the call.
Definition: CallEvent.cpp:412
An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:113
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:6330
The receiver is a superclass.
Definition: ExprObjC.h:1057
bool isInstanceMessage() const
Determine whether this is an instance message to either a computed object or to super.
Definition: ExprObjC.h:1201
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:542
SourceLocation getLocation() const
Definition: DeclBase.h:420
ArrayRef< ParmVarDecl * > parameters() const
Definition: DeclObjC.h:366
void getInitialStackFrameContents(const StackFrameContext *CalleeCtx, BindingsTy &Bindings) const override
Definition: CallEvent.cpp:902
const StackFrameContext * getCalleeStackFrame() const
Returns the callee stack frame.
Definition: CallEvent.cpp:194
virtual AnalysisManager & getAnalysisManager()=0