clang  3.9.0
ExprEngineC.cpp
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1 //=-- ExprEngineC.cpp - ExprEngine support for C expressions ----*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines ExprEngine's support for C expressions.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "clang/AST/ExprCXX.h"
17 
18 using namespace clang;
19 using namespace ento;
20 using llvm::APSInt;
21 
23  ExplodedNode *Pred,
24  ExplodedNodeSet &Dst) {
25 
26  Expr *LHS = B->getLHS()->IgnoreParens();
27  Expr *RHS = B->getRHS()->IgnoreParens();
28 
29  // FIXME: Prechecks eventually go in ::Visit().
30  ExplodedNodeSet CheckedSet;
31  ExplodedNodeSet Tmp2;
32  getCheckerManager().runCheckersForPreStmt(CheckedSet, Pred, B, *this);
33 
34  // With both the LHS and RHS evaluated, process the operation itself.
35  for (ExplodedNodeSet::iterator it=CheckedSet.begin(), ei=CheckedSet.end();
36  it != ei; ++it) {
37 
38  ProgramStateRef state = (*it)->getState();
39  const LocationContext *LCtx = (*it)->getLocationContext();
40  SVal LeftV = state->getSVal(LHS, LCtx);
41  SVal RightV = state->getSVal(RHS, LCtx);
42 
44 
45  if (Op == BO_Assign) {
46  // EXPERIMENTAL: "Conjured" symbols.
47  // FIXME: Handle structs.
48  if (RightV.isUnknown()) {
49  unsigned Count = currBldrCtx->blockCount();
50  RightV = svalBuilder.conjureSymbolVal(nullptr, B->getRHS(), LCtx,
51  Count);
52  }
53  // Simulate the effects of a "store": bind the value of the RHS
54  // to the L-Value represented by the LHS.
55  SVal ExprVal = B->isGLValue() ? LeftV : RightV;
56  evalStore(Tmp2, B, LHS, *it, state->BindExpr(B, LCtx, ExprVal),
57  LeftV, RightV);
58  continue;
59  }
60 
61  if (!B->isAssignmentOp()) {
62  StmtNodeBuilder Bldr(*it, Tmp2, *currBldrCtx);
63 
64  if (B->isAdditiveOp()) {
65  // If one of the operands is a location, conjure a symbol for the other
66  // one (offset) if it's unknown so that memory arithmetic always
67  // results in an ElementRegion.
68  // TODO: This can be removed after we enable history tracking with
69  // SymSymExpr.
70  unsigned Count = currBldrCtx->blockCount();
71  if (LeftV.getAs<Loc>() &&
73  RightV.isUnknown()) {
74  RightV = svalBuilder.conjureSymbolVal(RHS, LCtx, RHS->getType(),
75  Count);
76  }
77  if (RightV.getAs<Loc>() &&
79  LeftV.isUnknown()) {
80  LeftV = svalBuilder.conjureSymbolVal(LHS, LCtx, LHS->getType(),
81  Count);
82  }
83  }
84 
85  // Although we don't yet model pointers-to-members, we do need to make
86  // sure that the members of temporaries have a valid 'this' pointer for
87  // other checks.
88  if (B->getOpcode() == BO_PtrMemD)
89  state = createTemporaryRegionIfNeeded(state, LCtx, LHS);
90 
91  // Process non-assignments except commas or short-circuited
92  // logical expressions (LAnd and LOr).
93  SVal Result = evalBinOp(state, Op, LeftV, RightV, B->getType());
94  if (Result.isUnknown()) {
95  Bldr.generateNode(B, *it, state);
96  continue;
97  }
98 
99  state = state->BindExpr(B, LCtx, Result);
100  Bldr.generateNode(B, *it, state);
101  continue;
102  }
103 
104  assert (B->isCompoundAssignmentOp());
105 
106  switch (Op) {
107  default:
108  llvm_unreachable("Invalid opcode for compound assignment.");
109  case BO_MulAssign: Op = BO_Mul; break;
110  case BO_DivAssign: Op = BO_Div; break;
111  case BO_RemAssign: Op = BO_Rem; break;
112  case BO_AddAssign: Op = BO_Add; break;
113  case BO_SubAssign: Op = BO_Sub; break;
114  case BO_ShlAssign: Op = BO_Shl; break;
115  case BO_ShrAssign: Op = BO_Shr; break;
116  case BO_AndAssign: Op = BO_And; break;
117  case BO_XorAssign: Op = BO_Xor; break;
118  case BO_OrAssign: Op = BO_Or; break;
119  }
120 
121  // Perform a load (the LHS). This performs the checks for
122  // null dereferences, and so on.
123  ExplodedNodeSet Tmp;
124  SVal location = LeftV;
125  evalLoad(Tmp, B, LHS, *it, state, location);
126 
127  for (ExplodedNodeSet::iterator I = Tmp.begin(), E = Tmp.end(); I != E;
128  ++I) {
129 
130  state = (*I)->getState();
131  const LocationContext *LCtx = (*I)->getLocationContext();
132  SVal V = state->getSVal(LHS, LCtx);
133 
134  // Get the computation type.
135  QualType CTy =
136  cast<CompoundAssignOperator>(B)->getComputationResultType();
137  CTy = getContext().getCanonicalType(CTy);
138 
139  QualType CLHSTy =
140  cast<CompoundAssignOperator>(B)->getComputationLHSType();
141  CLHSTy = getContext().getCanonicalType(CLHSTy);
142 
144 
145  // Promote LHS.
146  V = svalBuilder.evalCast(V, CLHSTy, LTy);
147 
148  // Compute the result of the operation.
149  SVal Result = svalBuilder.evalCast(evalBinOp(state, Op, V, RightV, CTy),
150  B->getType(), CTy);
151 
152  // EXPERIMENTAL: "Conjured" symbols.
153  // FIXME: Handle structs.
154 
155  SVal LHSVal;
156 
157  if (Result.isUnknown()) {
158  // The symbolic value is actually for the type of the left-hand side
159  // expression, not the computation type, as this is the value the
160  // LValue on the LHS will bind to.
161  LHSVal = svalBuilder.conjureSymbolVal(nullptr, B->getRHS(), LCtx, LTy,
162  currBldrCtx->blockCount());
163  // However, we need to convert the symbol to the computation type.
164  Result = svalBuilder.evalCast(LHSVal, CTy, LTy);
165  }
166  else {
167  // The left-hand side may bind to a different value then the
168  // computation type.
169  LHSVal = svalBuilder.evalCast(Result, LTy, CTy);
170  }
171 
172  // In C++, assignment and compound assignment operators return an
173  // lvalue.
174  if (B->isGLValue())
175  state = state->BindExpr(B, LCtx, location);
176  else
177  state = state->BindExpr(B, LCtx, Result);
178 
179  evalStore(Tmp2, B, LHS, *I, state, location, LHSVal);
180  }
181  }
182 
183  // FIXME: postvisits eventually go in ::Visit()
184  getCheckerManager().runCheckersForPostStmt(Dst, Tmp2, B, *this);
185 }
186 
188  ExplodedNodeSet &Dst) {
189 
191 
192  const BlockDecl *BD = BE->getBlockDecl();
193  // Get the value of the block itself.
194  SVal V = svalBuilder.getBlockPointer(BD, T,
195  Pred->getLocationContext(),
196  currBldrCtx->blockCount());
197 
198  ProgramStateRef State = Pred->getState();
199 
200  // If we created a new MemRegion for the block, we should explicitly bind
201  // the captured variables.
202  if (const BlockDataRegion *BDR =
203  dyn_cast_or_null<BlockDataRegion>(V.getAsRegion())) {
204 
205  BlockDataRegion::referenced_vars_iterator I = BDR->referenced_vars_begin(),
206  E = BDR->referenced_vars_end();
207 
208  auto CI = BD->capture_begin();
209  auto CE = BD->capture_end();
210  for (; I != E; ++I) {
211  const VarRegion *capturedR = I.getCapturedRegion();
212  const VarRegion *originalR = I.getOriginalRegion();
213 
214  // If the capture had a copy expression, use the result of evaluating
215  // that expression, otherwise use the original value.
216  // We rely on the invariant that the block declaration's capture variables
217  // are a prefix of the BlockDataRegion's referenced vars (which may include
218  // referenced globals, etc.) to enable fast lookup of the capture for a
219  // given referenced var.
220  const Expr *copyExpr = nullptr;
221  if (CI != CE) {
222  assert(CI->getVariable() == capturedR->getDecl());
223  copyExpr = CI->getCopyExpr();
224  CI++;
225  }
226 
227  if (capturedR != originalR) {
228  SVal originalV;
229  if (copyExpr) {
230  originalV = State->getSVal(copyExpr, Pred->getLocationContext());
231  } else {
232  originalV = State->getSVal(loc::MemRegionVal(originalR));
233  }
234  State = State->bindLoc(loc::MemRegionVal(capturedR), originalV);
235  }
236  }
237  }
238 
239  ExplodedNodeSet Tmp;
240  StmtNodeBuilder Bldr(Pred, Tmp, *currBldrCtx);
241  Bldr.generateNode(BE, Pred,
242  State->BindExpr(BE, Pred->getLocationContext(), V),
244 
245  // FIXME: Move all post/pre visits to ::Visit().
246  getCheckerManager().runCheckersForPostStmt(Dst, Tmp, BE, *this);
247 }
248 
249 void ExprEngine::VisitCast(const CastExpr *CastE, const Expr *Ex,
250  ExplodedNode *Pred, ExplodedNodeSet &Dst) {
251 
252  ExplodedNodeSet dstPreStmt;
253  getCheckerManager().runCheckersForPreStmt(dstPreStmt, Pred, CastE, *this);
254 
255  if (CastE->getCastKind() == CK_LValueToRValue) {
256  for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end();
257  I!=E; ++I) {
258  ExplodedNode *subExprNode = *I;
259  ProgramStateRef state = subExprNode->getState();
260  const LocationContext *LCtx = subExprNode->getLocationContext();
261  evalLoad(Dst, CastE, CastE, subExprNode, state, state->getSVal(Ex, LCtx));
262  }
263  return;
264  }
265 
266  // All other casts.
267  QualType T = CastE->getType();
268  QualType ExTy = Ex->getType();
269 
270  if (const ExplicitCastExpr *ExCast=dyn_cast_or_null<ExplicitCastExpr>(CastE))
271  T = ExCast->getTypeAsWritten();
272 
273  StmtNodeBuilder Bldr(dstPreStmt, Dst, *currBldrCtx);
274  for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end();
275  I != E; ++I) {
276 
277  Pred = *I;
278  ProgramStateRef state = Pred->getState();
279  const LocationContext *LCtx = Pred->getLocationContext();
280 
281  switch (CastE->getCastKind()) {
282  case CK_LValueToRValue:
283  llvm_unreachable("LValueToRValue casts handled earlier.");
284  case CK_ToVoid:
285  continue;
286  // The analyzer doesn't do anything special with these casts,
287  // since it understands retain/release semantics already.
288  case CK_ARCProduceObject:
289  case CK_ARCConsumeObject:
290  case CK_ARCReclaimReturnedObject:
291  case CK_ARCExtendBlockObject: // Fall-through.
292  case CK_CopyAndAutoreleaseBlockObject:
293  // The analyser can ignore atomic casts for now, although some future
294  // checkers may want to make certain that you're not modifying the same
295  // value through atomic and nonatomic pointers.
296  case CK_AtomicToNonAtomic:
297  case CK_NonAtomicToAtomic:
298  // True no-ops.
299  case CK_NoOp:
300  case CK_ConstructorConversion:
301  case CK_UserDefinedConversion:
302  case CK_FunctionToPointerDecay:
303  case CK_BuiltinFnToFnPtr: {
304  // Copy the SVal of Ex to CastE.
305  ProgramStateRef state = Pred->getState();
306  const LocationContext *LCtx = Pred->getLocationContext();
307  SVal V = state->getSVal(Ex, LCtx);
308  state = state->BindExpr(CastE, LCtx, V);
309  Bldr.generateNode(CastE, Pred, state);
310  continue;
311  }
312  case CK_MemberPointerToBoolean:
313  // FIXME: For now, member pointers are represented by void *.
314  // FALLTHROUGH
315  case CK_Dependent:
316  case CK_ArrayToPointerDecay:
317  case CK_BitCast:
318  case CK_AddressSpaceConversion:
319  case CK_BooleanToSignedIntegral:
320  case CK_NullToPointer:
321  case CK_IntegralToPointer:
322  case CK_PointerToIntegral:
323  case CK_PointerToBoolean:
324  case CK_IntegralToBoolean:
325  case CK_IntegralToFloating:
326  case CK_FloatingToIntegral:
327  case CK_FloatingToBoolean:
328  case CK_FloatingCast:
329  case CK_FloatingRealToComplex:
330  case CK_FloatingComplexToReal:
331  case CK_FloatingComplexToBoolean:
332  case CK_FloatingComplexCast:
333  case CK_FloatingComplexToIntegralComplex:
334  case CK_IntegralRealToComplex:
335  case CK_IntegralComplexToReal:
336  case CK_IntegralComplexToBoolean:
337  case CK_IntegralComplexCast:
338  case CK_IntegralComplexToFloatingComplex:
339  case CK_CPointerToObjCPointerCast:
340  case CK_BlockPointerToObjCPointerCast:
341  case CK_AnyPointerToBlockPointerCast:
342  case CK_ObjCObjectLValueCast:
343  case CK_ZeroToOCLEvent:
344  case CK_LValueBitCast: {
345  // Delegate to SValBuilder to process.
346  SVal V = state->getSVal(Ex, LCtx);
347  V = svalBuilder.evalCast(V, T, ExTy);
348  // Negate the result if we're treating the boolean as a signed i1
349  if (CastE->getCastKind() == CK_BooleanToSignedIntegral)
350  V = evalMinus(V);
351  state = state->BindExpr(CastE, LCtx, V);
352  Bldr.generateNode(CastE, Pred, state);
353  continue;
354  }
355  case CK_IntegralCast: {
356  // Delegate to SValBuilder to process.
357  SVal V = state->getSVal(Ex, LCtx);
358  V = svalBuilder.evalIntegralCast(state, V, T, ExTy);
359  state = state->BindExpr(CastE, LCtx, V);
360  Bldr.generateNode(CastE, Pred, state);
361  continue;
362  }
363  case CK_DerivedToBase:
364  case CK_UncheckedDerivedToBase: {
365  // For DerivedToBase cast, delegate to the store manager.
366  SVal val = state->getSVal(Ex, LCtx);
367  val = getStoreManager().evalDerivedToBase(val, CastE);
368  state = state->BindExpr(CastE, LCtx, val);
369  Bldr.generateNode(CastE, Pred, state);
370  continue;
371  }
372  // Handle C++ dyn_cast.
373  case CK_Dynamic: {
374  SVal val = state->getSVal(Ex, LCtx);
375 
376  // Compute the type of the result.
377  QualType resultType = CastE->getType();
378  if (CastE->isGLValue())
379  resultType = getContext().getPointerType(resultType);
380 
381  bool Failed = false;
382 
383  // Check if the value being cast evaluates to 0.
384  if (val.isZeroConstant())
385  Failed = true;
386  // Else, evaluate the cast.
387  else
388  val = getStoreManager().evalDynamicCast(val, T, Failed);
389 
390  if (Failed) {
391  if (T->isReferenceType()) {
392  // A bad_cast exception is thrown if input value is a reference.
393  // Currently, we model this, by generating a sink.
394  Bldr.generateSink(CastE, Pred, state);
395  continue;
396  } else {
397  // If the cast fails on a pointer, bind to 0.
398  state = state->BindExpr(CastE, LCtx, svalBuilder.makeNull());
399  }
400  } else {
401  // If we don't know if the cast succeeded, conjure a new symbol.
402  if (val.isUnknown()) {
403  DefinedOrUnknownSVal NewSym =
404  svalBuilder.conjureSymbolVal(nullptr, CastE, LCtx, resultType,
405  currBldrCtx->blockCount());
406  state = state->BindExpr(CastE, LCtx, NewSym);
407  } else
408  // Else, bind to the derived region value.
409  state = state->BindExpr(CastE, LCtx, val);
410  }
411  Bldr.generateNode(CastE, Pred, state);
412  continue;
413  }
414  case CK_NullToMemberPointer: {
415  // FIXME: For now, member pointers are represented by void *.
416  SVal V = svalBuilder.makeNull();
417  state = state->BindExpr(CastE, LCtx, V);
418  Bldr.generateNode(CastE, Pred, state);
419  continue;
420  }
421  // Various C++ casts that are not handled yet.
422  case CK_ToUnion:
423  case CK_BaseToDerived:
424  case CK_BaseToDerivedMemberPointer:
425  case CK_DerivedToBaseMemberPointer:
426  case CK_ReinterpretMemberPointer:
427  case CK_VectorSplat: {
428  // Recover some path-sensitivty by conjuring a new value.
429  QualType resultType = CastE->getType();
430  if (CastE->isGLValue())
431  resultType = getContext().getPointerType(resultType);
432  SVal result = svalBuilder.conjureSymbolVal(nullptr, CastE, LCtx,
433  resultType,
434  currBldrCtx->blockCount());
435  state = state->BindExpr(CastE, LCtx, result);
436  Bldr.generateNode(CastE, Pred, state);
437  continue;
438  }
439  }
440  }
441 }
442 
444  ExplodedNode *Pred,
445  ExplodedNodeSet &Dst) {
446  StmtNodeBuilder B(Pred, Dst, *currBldrCtx);
447 
448  ProgramStateRef State = Pred->getState();
449  const LocationContext *LCtx = Pred->getLocationContext();
450 
451  const Expr *Init = CL->getInitializer();
452  SVal V = State->getSVal(CL->getInitializer(), LCtx);
453 
454  if (isa<CXXConstructExpr>(Init)) {
455  // No work needed. Just pass the value up to this expression.
456  } else {
457  assert(isa<InitListExpr>(Init));
458  Loc CLLoc = State->getLValue(CL, LCtx);
459  State = State->bindLoc(CLLoc, V);
460 
461  // Compound literal expressions are a GNU extension in C++.
462  // Unlike in C, where CLs are lvalues, in C++ CLs are prvalues,
463  // and like temporary objects created by the functional notation T()
464  // CLs are destroyed at the end of the containing full-expression.
465  // HOWEVER, an rvalue of array type is not something the analyzer can
466  // reason about, since we expect all regions to be wrapped in Locs.
467  // So we treat array CLs as lvalues as well, knowing that they will decay
468  // to pointers as soon as they are used.
469  if (CL->isGLValue() || CL->getType()->isArrayType())
470  V = CLLoc;
471  }
472 
473  B.generateNode(CL, Pred, State->BindExpr(CL, LCtx, V));
474 }
475 
477  ExplodedNodeSet &Dst) {
478  // Assumption: The CFG has one DeclStmt per Decl.
479  const VarDecl *VD = dyn_cast_or_null<VarDecl>(*DS->decl_begin());
480 
481  if (!VD) {
482  //TODO:AZ: remove explicit insertion after refactoring is done.
483  Dst.insert(Pred);
484  return;
485  }
486 
487  // FIXME: all pre/post visits should eventually be handled by ::Visit().
488  ExplodedNodeSet dstPreVisit;
489  getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, DS, *this);
490 
491  ExplodedNodeSet dstEvaluated;
492  StmtNodeBuilder B(dstPreVisit, dstEvaluated, *currBldrCtx);
493  for (ExplodedNodeSet::iterator I = dstPreVisit.begin(), E = dstPreVisit.end();
494  I!=E; ++I) {
495  ExplodedNode *N = *I;
497  const LocationContext *LC = N->getLocationContext();
498 
499  // Decls without InitExpr are not initialized explicitly.
500  if (const Expr *InitEx = VD->getInit()) {
501 
502  // Note in the state that the initialization has occurred.
503  ExplodedNode *UpdatedN = N;
504  SVal InitVal = state->getSVal(InitEx, LC);
505 
506  assert(DS->isSingleDecl());
507  if (auto *CtorExpr = findDirectConstructorForCurrentCFGElement()) {
508  assert(InitEx->IgnoreImplicit() == CtorExpr);
509  (void)CtorExpr;
510  // We constructed the object directly in the variable.
511  // No need to bind anything.
512  B.generateNode(DS, UpdatedN, state);
513  } else {
514  // We bound the temp obj region to the CXXConstructExpr. Now recover
515  // the lazy compound value when the variable is not a reference.
516  if (AMgr.getLangOpts().CPlusPlus && VD->getType()->isRecordType() &&
517  !VD->getType()->isReferenceType()) {
519  InitVal.getAs<loc::MemRegionVal>()) {
520  InitVal = state->getSVal(M->getRegion());
521  assert(InitVal.getAs<nonloc::LazyCompoundVal>());
522  }
523  }
524 
525  // Recover some path-sensitivity if a scalar value evaluated to
526  // UnknownVal.
527  if (InitVal.isUnknown()) {
528  QualType Ty = InitEx->getType();
529  if (InitEx->isGLValue()) {
530  Ty = getContext().getPointerType(Ty);
531  }
532 
533  InitVal = svalBuilder.conjureSymbolVal(nullptr, InitEx, LC, Ty,
534  currBldrCtx->blockCount());
535  }
536 
537 
538  B.takeNodes(UpdatedN);
539  ExplodedNodeSet Dst2;
540  evalBind(Dst2, DS, UpdatedN, state->getLValue(VD, LC), InitVal, true);
541  B.addNodes(Dst2);
542  }
543  }
544  else {
545  B.generateNode(DS, N, state);
546  }
547  }
548 
549  getCheckerManager().runCheckersForPostStmt(Dst, B.getResults(), DS, *this);
550 }
551 
553  ExplodedNodeSet &Dst) {
554  assert(B->getOpcode() == BO_LAnd ||
555  B->getOpcode() == BO_LOr);
556 
557  StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx);
558  ProgramStateRef state = Pred->getState();
559 
560  ExplodedNode *N = Pred;
561  while (!N->getLocation().getAs<BlockEntrance>()) {
562  ProgramPoint P = N->getLocation();
563  assert(P.getAs<PreStmt>()|| P.getAs<PreStmtPurgeDeadSymbols>());
564  (void) P;
565  assert(N->pred_size() == 1);
566  N = *N->pred_begin();
567  }
568  assert(N->pred_size() == 1);
569  N = *N->pred_begin();
570  BlockEdge BE = N->getLocation().castAs<BlockEdge>();
571  SVal X;
572 
573  // Determine the value of the expression by introspecting how we
574  // got this location in the CFG. This requires looking at the previous
575  // block we were in and what kind of control-flow transfer was involved.
576  const CFGBlock *SrcBlock = BE.getSrc();
577  // The only terminator (if there is one) that makes sense is a logical op.
578  CFGTerminator T = SrcBlock->getTerminator();
579  if (const BinaryOperator *Term = cast_or_null<BinaryOperator>(T.getStmt())) {
580  (void) Term;
581  assert(Term->isLogicalOp());
582  assert(SrcBlock->succ_size() == 2);
583  // Did we take the true or false branch?
584  unsigned constant = (*SrcBlock->succ_begin() == BE.getDst()) ? 1 : 0;
585  X = svalBuilder.makeIntVal(constant, B->getType());
586  }
587  else {
588  // If there is no terminator, by construction the last statement
589  // in SrcBlock is the value of the enclosing expression.
590  // However, we still need to constrain that value to be 0 or 1.
591  assert(!SrcBlock->empty());
592  CFGStmt Elem = SrcBlock->rbegin()->castAs<CFGStmt>();
593  const Expr *RHS = cast<Expr>(Elem.getStmt());
594  SVal RHSVal = N->getState()->getSVal(RHS, Pred->getLocationContext());
595 
596  if (RHSVal.isUndef()) {
597  X = RHSVal;
598  } else {
599  DefinedOrUnknownSVal DefinedRHS = RHSVal.castAs<DefinedOrUnknownSVal>();
600  ProgramStateRef StTrue, StFalse;
601  std::tie(StTrue, StFalse) = N->getState()->assume(DefinedRHS);
602  if (StTrue) {
603  if (StFalse) {
604  // We can't constrain the value to 0 or 1.
605  // The best we can do is a cast.
606  X = getSValBuilder().evalCast(RHSVal, B->getType(), RHS->getType());
607  } else {
608  // The value is known to be true.
609  X = getSValBuilder().makeIntVal(1, B->getType());
610  }
611  } else {
612  // The value is known to be false.
613  assert(StFalse && "Infeasible path!");
614  X = getSValBuilder().makeIntVal(0, B->getType());
615  }
616  }
617  }
618  Bldr.generateNode(B, Pred, state->BindExpr(B, Pred->getLocationContext(), X));
619 }
620 
622  ExplodedNode *Pred,
623  ExplodedNodeSet &Dst) {
624  StmtNodeBuilder B(Pred, Dst, *currBldrCtx);
625 
626  ProgramStateRef state = Pred->getState();
627  const LocationContext *LCtx = Pred->getLocationContext();
629  unsigned NumInitElements = IE->getNumInits();
630 
631  if (!IE->isGLValue() &&
632  (T->isArrayType() || T->isRecordType() || T->isVectorType() ||
633  T->isAnyComplexType())) {
635 
636  // Handle base case where the initializer has no elements.
637  // e.g: static int* myArray[] = {};
638  if (NumInitElements == 0) {
639  SVal V = svalBuilder.makeCompoundVal(T, vals);
640  B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, V));
641  return;
642  }
643 
645  ei = IE->rend(); it != ei; ++it) {
646  SVal V = state->getSVal(cast<Expr>(*it), LCtx);
647  vals = getBasicVals().consVals(V, vals);
648  }
649 
650  B.generateNode(IE, Pred,
651  state->BindExpr(IE, LCtx,
652  svalBuilder.makeCompoundVal(T, vals)));
653  return;
654  }
655 
656  // Handle scalars: int{5} and int{} and GLvalues.
657  // Note, if the InitListExpr is a GLvalue, it means that there is an address
658  // representing it, so it must have a single init element.
659  assert(NumInitElements <= 1);
660 
661  SVal V;
662  if (NumInitElements == 0)
663  V = getSValBuilder().makeZeroVal(T);
664  else
665  V = state->getSVal(IE->getInit(0), LCtx);
666 
667  B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, V));
668 }
669 
671  const Expr *L,
672  const Expr *R,
673  ExplodedNode *Pred,
674  ExplodedNodeSet &Dst) {
675  assert(L && R);
676 
677  StmtNodeBuilder B(Pred, Dst, *currBldrCtx);
678  ProgramStateRef state = Pred->getState();
679  const LocationContext *LCtx = Pred->getLocationContext();
680  const CFGBlock *SrcBlock = nullptr;
681 
682  // Find the predecessor block.
683  ProgramStateRef SrcState = state;
684  for (const ExplodedNode *N = Pred ; N ; N = *N->pred_begin()) {
685  ProgramPoint PP = N->getLocation();
686  if (PP.getAs<PreStmtPurgeDeadSymbols>() || PP.getAs<BlockEntrance>()) {
687  assert(N->pred_size() == 1);
688  continue;
689  }
690  SrcBlock = PP.castAs<BlockEdge>().getSrc();
691  SrcState = N->getState();
692  break;
693  }
694 
695  assert(SrcBlock && "missing function entry");
696 
697  // Find the last expression in the predecessor block. That is the
698  // expression that is used for the value of the ternary expression.
699  bool hasValue = false;
700  SVal V;
701 
702  for (CFGElement CE : llvm::reverse(*SrcBlock)) {
703  if (Optional<CFGStmt> CS = CE.getAs<CFGStmt>()) {
704  const Expr *ValEx = cast<Expr>(CS->getStmt());
705  ValEx = ValEx->IgnoreParens();
706 
707  // For GNU extension '?:' operator, the left hand side will be an
708  // OpaqueValueExpr, so get the underlying expression.
709  if (const OpaqueValueExpr *OpaqueEx = dyn_cast<OpaqueValueExpr>(L))
710  L = OpaqueEx->getSourceExpr();
711 
712  // If the last expression in the predecessor block matches true or false
713  // subexpression, get its the value.
714  if (ValEx == L->IgnoreParens() || ValEx == R->IgnoreParens()) {
715  hasValue = true;
716  V = SrcState->getSVal(ValEx, LCtx);
717  }
718  break;
719  }
720  }
721 
722  if (!hasValue)
723  V = svalBuilder.conjureSymbolVal(nullptr, Ex, LCtx,
724  currBldrCtx->blockCount());
725 
726  // Generate a new node with the binding from the appropriate path.
727  B.generateNode(Ex, Pred, state->BindExpr(Ex, LCtx, V, true));
728 }
729 
730 void ExprEngine::
732  ExplodedNode *Pred, ExplodedNodeSet &Dst) {
733  StmtNodeBuilder B(Pred, Dst, *currBldrCtx);
734  APSInt IV;
735  if (OOE->EvaluateAsInt(IV, getContext())) {
736  assert(IV.getBitWidth() == getContext().getTypeSize(OOE->getType()));
737  assert(OOE->getType()->isBuiltinType());
738  assert(OOE->getType()->getAs<BuiltinType>()->isInteger());
739  assert(IV.isSigned() == OOE->getType()->isSignedIntegerType());
740  SVal X = svalBuilder.makeIntVal(IV);
741  B.generateNode(OOE, Pred,
742  Pred->getState()->BindExpr(OOE, Pred->getLocationContext(),
743  X));
744  }
745  // FIXME: Handle the case where __builtin_offsetof is not a constant.
746 }
747 
748 
749 void ExprEngine::
751  ExplodedNode *Pred,
752  ExplodedNodeSet &Dst) {
753  // FIXME: Prechecks eventually go in ::Visit().
754  ExplodedNodeSet CheckedSet;
755  getCheckerManager().runCheckersForPreStmt(CheckedSet, Pred, Ex, *this);
756 
757  ExplodedNodeSet EvalSet;
758  StmtNodeBuilder Bldr(CheckedSet, EvalSet, *currBldrCtx);
759 
760  QualType T = Ex->getTypeOfArgument();
761 
762  for (ExplodedNodeSet::iterator I = CheckedSet.begin(), E = CheckedSet.end();
763  I != E; ++I) {
764  if (Ex->getKind() == UETT_SizeOf) {
765  if (!T->isIncompleteType() && !T->isConstantSizeType()) {
766  assert(T->isVariableArrayType() && "Unknown non-constant-sized type.");
767 
768  // FIXME: Add support for VLA type arguments and VLA expressions.
769  // When that happens, we should probably refactor VLASizeChecker's code.
770  continue;
771  } else if (T->getAs<ObjCObjectType>()) {
772  // Some code tries to take the sizeof an ObjCObjectType, relying that
773  // the compiler has laid out its representation. Just report Unknown
774  // for these.
775  continue;
776  }
777  }
778 
779  APSInt Value = Ex->EvaluateKnownConstInt(getContext());
780  CharUnits amt = CharUnits::fromQuantity(Value.getZExtValue());
781 
782  ProgramStateRef state = (*I)->getState();
783  state = state->BindExpr(Ex, (*I)->getLocationContext(),
784  svalBuilder.makeIntVal(amt.getQuantity(),
785  Ex->getType()));
786  Bldr.generateNode(Ex, *I, state);
787  }
788 
789  getCheckerManager().runCheckersForPostStmt(Dst, EvalSet, Ex, *this);
790 }
791 
793  ExplodedNode *Pred,
794  ExplodedNodeSet &Dst) {
795  // FIXME: Prechecks eventually go in ::Visit().
796  ExplodedNodeSet CheckedSet;
797  getCheckerManager().runCheckersForPreStmt(CheckedSet, Pred, U, *this);
798 
799  ExplodedNodeSet EvalSet;
800  StmtNodeBuilder Bldr(CheckedSet, EvalSet, *currBldrCtx);
801 
802  for (ExplodedNodeSet::iterator I = CheckedSet.begin(), E = CheckedSet.end();
803  I != E; ++I) {
804  switch (U->getOpcode()) {
805  default: {
806  Bldr.takeNodes(*I);
807  ExplodedNodeSet Tmp;
809  Bldr.addNodes(Tmp);
810  break;
811  }
812  case UO_Real: {
813  const Expr *Ex = U->getSubExpr()->IgnoreParens();
814 
815  // FIXME: We don't have complex SValues yet.
816  if (Ex->getType()->isAnyComplexType()) {
817  // Just report "Unknown."
818  break;
819  }
820 
821  // For all other types, UO_Real is an identity operation.
822  assert (U->getType() == Ex->getType());
823  ProgramStateRef state = (*I)->getState();
824  const LocationContext *LCtx = (*I)->getLocationContext();
825  Bldr.generateNode(U, *I, state->BindExpr(U, LCtx,
826  state->getSVal(Ex, LCtx)));
827  break;
828  }
829 
830  case UO_Imag: {
831  const Expr *Ex = U->getSubExpr()->IgnoreParens();
832  // FIXME: We don't have complex SValues yet.
833  if (Ex->getType()->isAnyComplexType()) {
834  // Just report "Unknown."
835  break;
836  }
837  // For all other types, UO_Imag returns 0.
838  ProgramStateRef state = (*I)->getState();
839  const LocationContext *LCtx = (*I)->getLocationContext();
840  SVal X = svalBuilder.makeZeroVal(Ex->getType());
841  Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, X));
842  break;
843  }
844 
845  case UO_Plus:
846  assert(!U->isGLValue());
847  // FALL-THROUGH.
848  case UO_Deref:
849  case UO_AddrOf:
850  case UO_Extension: {
851  // FIXME: We can probably just have some magic in Environment::getSVal()
852  // that propagates values, instead of creating a new node here.
853  //
854  // Unary "+" is a no-op, similar to a parentheses. We still have places
855  // where it may be a block-level expression, so we need to
856  // generate an extra node that just propagates the value of the
857  // subexpression.
858  const Expr *Ex = U->getSubExpr()->IgnoreParens();
859  ProgramStateRef state = (*I)->getState();
860  const LocationContext *LCtx = (*I)->getLocationContext();
861  Bldr.generateNode(U, *I, state->BindExpr(U, LCtx,
862  state->getSVal(Ex, LCtx)));
863  break;
864  }
865 
866  case UO_LNot:
867  case UO_Minus:
868  case UO_Not: {
869  assert (!U->isGLValue());
870  const Expr *Ex = U->getSubExpr()->IgnoreParens();
871  ProgramStateRef state = (*I)->getState();
872  const LocationContext *LCtx = (*I)->getLocationContext();
873 
874  // Get the value of the subexpression.
875  SVal V = state->getSVal(Ex, LCtx);
876 
877  if (V.isUnknownOrUndef()) {
878  Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, V));
879  break;
880  }
881 
882  switch (U->getOpcode()) {
883  default:
884  llvm_unreachable("Invalid Opcode.");
885  case UO_Not:
886  // FIXME: Do we need to handle promotions?
887  state = state->BindExpr(U, LCtx, evalComplement(V.castAs<NonLoc>()));
888  break;
889  case UO_Minus:
890  // FIXME: Do we need to handle promotions?
891  state = state->BindExpr(U, LCtx, evalMinus(V.castAs<NonLoc>()));
892  break;
893  case UO_LNot:
894  // C99 6.5.3.3: "The expression !E is equivalent to (0==E)."
895  //
896  // Note: technically we do "E == 0", but this is the same in the
897  // transfer functions as "0 == E".
898  SVal Result;
899  if (Optional<Loc> LV = V.getAs<Loc>()) {
900  Loc X = svalBuilder.makeNull();
901  Result = evalBinOp(state, BO_EQ, *LV, X, U->getType());
902  }
903  else if (Ex->getType()->isFloatingType()) {
904  // FIXME: handle floating point types.
905  Result = UnknownVal();
906  } else {
907  nonloc::ConcreteInt X(getBasicVals().getValue(0, Ex->getType()));
908  Result = evalBinOp(state, BO_EQ, V.castAs<NonLoc>(), X,
909  U->getType());
910  }
911 
912  state = state->BindExpr(U, LCtx, Result);
913  break;
914  }
915  Bldr.generateNode(U, *I, state);
916  break;
917  }
918  }
919  }
920 
921  getCheckerManager().runCheckersForPostStmt(Dst, EvalSet, U, *this);
922 }
923 
925  ExplodedNode *Pred,
926  ExplodedNodeSet &Dst) {
927  // Handle ++ and -- (both pre- and post-increment).
928  assert (U->isIncrementDecrementOp());
929  const Expr *Ex = U->getSubExpr()->IgnoreParens();
930 
931  const LocationContext *LCtx = Pred->getLocationContext();
932  ProgramStateRef state = Pred->getState();
933  SVal loc = state->getSVal(Ex, LCtx);
934 
935  // Perform a load.
936  ExplodedNodeSet Tmp;
937  evalLoad(Tmp, U, Ex, Pred, state, loc);
938 
939  ExplodedNodeSet Dst2;
940  StmtNodeBuilder Bldr(Tmp, Dst2, *currBldrCtx);
941  for (ExplodedNodeSet::iterator I=Tmp.begin(), E=Tmp.end();I!=E;++I) {
942 
943  state = (*I)->getState();
944  assert(LCtx == (*I)->getLocationContext());
945  SVal V2_untested = state->getSVal(Ex, LCtx);
946 
947  // Propagate unknown and undefined values.
948  if (V2_untested.isUnknownOrUndef()) {
949  Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, V2_untested));
950  continue;
951  }
952  DefinedSVal V2 = V2_untested.castAs<DefinedSVal>();
953 
954  // Handle all other values.
955  BinaryOperator::Opcode Op = U->isIncrementOp() ? BO_Add : BO_Sub;
956 
957  // If the UnaryOperator has non-location type, use its type to create the
958  // constant value. If the UnaryOperator has location type, create the
959  // constant with int type and pointer width.
960  SVal RHS;
961 
962  if (U->getType()->isAnyPointerType())
963  RHS = svalBuilder.makeArrayIndex(1);
964  else if (U->getType()->isIntegralOrEnumerationType())
965  RHS = svalBuilder.makeIntVal(1, U->getType());
966  else
967  RHS = UnknownVal();
968 
969  SVal Result = evalBinOp(state, Op, V2, RHS, U->getType());
970 
971  // Conjure a new symbol if necessary to recover precision.
972  if (Result.isUnknown()){
973  DefinedOrUnknownSVal SymVal =
974  svalBuilder.conjureSymbolVal(nullptr, Ex, LCtx,
975  currBldrCtx->blockCount());
976  Result = SymVal;
977 
978  // If the value is a location, ++/-- should always preserve
979  // non-nullness. Check if the original value was non-null, and if so
980  // propagate that constraint.
981  if (Loc::isLocType(U->getType())) {
982  DefinedOrUnknownSVal Constraint =
983  svalBuilder.evalEQ(state, V2,svalBuilder.makeZeroVal(U->getType()));
984 
985  if (!state->assume(Constraint, true)) {
986  // It isn't feasible for the original value to be null.
987  // Propagate this constraint.
988  Constraint = svalBuilder.evalEQ(state, SymVal,
989  svalBuilder.makeZeroVal(U->getType()));
990 
991 
992  state = state->assume(Constraint, false);
993  assert(state);
994  }
995  }
996  }
997 
998  // Since the lvalue-to-rvalue conversion is explicit in the AST,
999  // we bind an l-value if the operator is prefix and an lvalue (in C++).
1000  if (U->isGLValue())
1001  state = state->BindExpr(U, LCtx, loc);
1002  else
1003  state = state->BindExpr(U, LCtx, U->isPostfix() ? V2 : Result);
1004 
1005  // Perform the store.
1006  Bldr.takeNodes(*I);
1007  ExplodedNodeSet Dst3;
1008  evalStore(Dst3, U, U, *I, state, loc, Result);
1009  Bldr.addNodes(Dst3);
1010  }
1011  Dst.insert(Dst2);
1012 }
unsigned getNumInits() const
Definition: Expr.h:3776
CastKind getCastKind() const
Definition: Expr.h:2680
nonloc::ConcreteInt makeIntVal(const IntegerLiteral *integer)
Definition: SValBuilder.h:237
DefinedSVal getBlockPointer(const BlockDecl *block, CanQualType locTy, const LocationContext *locContext, unsigned blockCount)
reverse_iterator rbegin()
Definition: Expr.h:3924
SVal evalDerivedToBase(SVal Derived, const CastExpr *Cast)
Evaluates a chain of derived-to-base casts through the path specified in Cast.
Definition: Store.cpp:235
SVal evalDynamicCast(SVal Base, QualType DerivedPtrType, bool &Failed)
Evaluates C++ dynamic_cast cast.
Definition: Store.cpp:295
A (possibly-)qualified type.
Definition: Type.h:598
succ_iterator succ_begin()
Definition: CFG.h:541
This builder class is useful for generating nodes that resulted from visiting a statement.
Definition: CoreEngine.h:348
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:179
bool isRecordType() const
Definition: Type.h:5539
ProgramPoint getLocation() const
getLocation - Returns the edge associated with the given node.
StringRef P
SVal evalBinOp(ProgramStateRef state, BinaryOperator::Opcode op, NonLoc L, NonLoc R, QualType T)
Definition: ExprEngine.h:487
unsigned pred_size() const
Represents a point after we ran remove dead bindings BEFORE processing the given statement.
Definition: ProgramPoint.h:441
const Expr * getInit() const
Definition: Decl.h:1139
SVal evalCast(SVal val, QualType castTy, QualType originalType)
Value representing integer constant.
Definition: SVals.h:341
void VisitUnaryOperator(const UnaryOperator *B, ExplodedNode *Pred, ExplodedNodeSet &Dst)
VisitUnaryOperator - Transfer function logic for unary operators.
void takeNodes(const ExplodedNodeSet &S)
Definition: CoreEngine.h:301
VarDecl - An instance of this class is created to represent a variable declaration or definition...
Definition: Decl.h:768
CompoundLiteralExpr - [C99 6.5.2.5].
Definition: Expr.h:2562
unsigned succ_size() const
Definition: CFG.h:551
NonLoc makeArrayIndex(uint64_t idx)
Definition: SValBuilder.h:231
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:1813
void evalStore(ExplodedNodeSet &Dst, const Expr *AssignE, const Expr *StoreE, ExplodedNode *Pred, ProgramStateRef St, SVal TargetLV, SVal Val, const ProgramPointTag *tag=nullptr)
evalStore - Handle the semantics of a store via an assignment.
UnaryExprOrTypeTrait getKind() const
Definition: Expr.h:2005
static bool isAssignmentOp(Opcode Opc)
Definition: Expr.h:3022
bool isZeroConstant() const
Definition: SVals.cpp:186
Defines the clang::Expr interface and subclasses for C++ expressions.
InitExprsTy::const_reverse_iterator const_reverse_iterator
Definition: Expr.h:3918
Represents a class type in Objective C.
Definition: Type.h:4727
LineState State
SVal evalIntegralCast(ProgramStateRef state, SVal val, QualType castTy, QualType originalType)
bool isReferenceType() const
Definition: Type.h:5491
bool isAnyPointerType() const
Definition: Type.h:5485
llvm::ImmutableList< SVal > consVals(SVal X, llvm::ImmutableList< SVal > L)
static bool isIncrementDecrementOp(Opcode Op)
Definition: Expr.h:1729
T castAs() const
Convert to the specified CFGElement type, asserting that this CFGElement is of the desired type...
Definition: CFG.h:87
ASTContext & getContext() const
getContext - Return the ASTContext associated with this analysis.
Definition: ExprEngine.h:123
i32 captured_struct **param SharedsTy A type which contains references the shared variables *param Shareds Context with the list of shared variables from the p *TaskFunction *param Data Additional data for task generation like final * state
Expr * getLHS() const
Definition: Expr.h:2943
const VarDecl * getDecl() const
Definition: MemRegion.h:873
static bool isLocType(QualType T)
Definition: SVals.h:291
Describes an C or C++ initializer list.
Definition: Expr.h:3746
void VisitOffsetOfExpr(const OffsetOfExpr *Ex, ExplodedNode *Pred, ExplodedNodeSet &Dst)
VisitOffsetOfExpr - Transfer function for offsetof.
BinaryOperatorKind
BlockDataRegion - A region that represents a block instance.
Definition: MemRegion.h:627
ExplodedNode * generateSink(const Stmt *S, ExplodedNode *Pred, ProgramStateRef St, const ProgramPointTag *tag=nullptr, ProgramPoint::Kind K=ProgramPoint::PostStmtKind)
Definition: CoreEngine.h:388
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
bool isUnknownOrUndef() const
Definition: SVals.h:125
A builtin binary operation expression such as "x + y" or "x <= y".
Definition: Expr.h:2897
static bool isPostfix(Opcode Op)
isPostfix - Return true if this is a postfix operation, like x++.
Definition: Expr.h:1703
NonLoc makeCompoundVal(QualType type, llvm::ImmutableList< SVal > vals)
Definition: SValBuilder.h:217
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:2632
bool isIncompleteType(NamedDecl **Def=nullptr) const
Types are partitioned into 3 broad categories (C99 6.2.5p1): object types, function types...
Definition: Type.cpp:1892
SVal evalComplement(SVal X)
Definition: ExprEngine.h:481
void VisitDeclStmt(const DeclStmt *DS, ExplodedNode *Pred, ExplodedNodeSet &Dst)
VisitDeclStmt - Transfer function logic for DeclStmts.
detail::InMemoryDirectory::const_iterator I
QualType getType() const
Definition: Decl.h:599
void evalBind(ExplodedNodeSet &Dst, const Stmt *StoreE, ExplodedNode *Pred, SVal location, SVal Val, bool atDeclInit=false, const ProgramPoint *PP=nullptr)
evalBind - Handle the semantics of binding a value to a specific location.
void VisitLogicalExpr(const BinaryOperator *B, ExplodedNode *Pred, ExplodedNodeSet &Dst)
VisitLogicalExpr - Transfer function logic for '&&', '||'.
const LocationContext * getLocationContext() const
const CFGBlock * getSrc() const
Definition: ProgramPoint.h:479
UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) expression operand...
Definition: Expr.h:1974
CFGBlock - Represents a single basic block in a source-level CFG.
Definition: CFG.h:353
void VisitInitListExpr(const InitListExpr *E, ExplodedNode *Pred, ExplodedNodeSet &Dst)
unsigned blockCount() const
Returns the number of times the current basic block has been visited on the exploded graph path...
Definition: CoreEngine.h:194
CheckerManager & getCheckerManager() const
Definition: ExprEngine.h:127
void runCheckersForPostStmt(ExplodedNodeSet &Dst, const ExplodedNodeSet &Src, const Stmt *S, ExprEngine &Eng, bool wasInlined=false)
Run checkers for post-visiting Stmts.
const CFGBlock * getDst() const
Definition: ProgramPoint.h:483
DefinedOrUnknownSVal makeZeroVal(QualType type)
Construct an SVal representing '0' for the specified type.
Definition: SValBuilder.cpp:32
BlockDecl - This represents a block literal declaration, which is like an unnamed FunctionDecl...
Definition: Decl.h:3456
Expr - This represents one expression.
Definition: Expr.h:105
const ProgramStateRef & getState() const
bool isAnyComplexType() const
Definition: Type.h:5545
void VisitCast(const CastExpr *CastE, const Expr *Ex, ExplodedNode *Pred, ExplodedNodeSet &Dst)
VisitCast - Transfer function logic for all casts (implicit and explicit).
BlockExpr - Adaptor class for mixing a BlockDecl with expressions.
Definition: Expr.h:4567
capture_const_iterator capture_begin() const
Definition: Decl.h:3583
Optional< T > getAs() const
Convert to the specified SVal type, returning None if this SVal is not of the desired type...
Definition: SVals.h:86
bool isVariableArrayType() const
Definition: Type.h:5530
const ExplodedNodeSet & getResults()
Definition: CoreEngine.h:280
static CharUnits fromQuantity(QuantityType Quantity)
fromQuantity - Construct a CharUnits quantity from a raw integer type.
Definition: CharUnits.h:63
static SVal getValue(SVal val, SValBuilder &svalBuilder)
Expr * getSubExpr() const
Definition: Expr.h:1695
T castAs() const
Convert to the specified ProgramPoint type, asserting that this ProgramPoint is of the desired type...
Definition: ProgramPoint.h:139
bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, SideEffectsKind AllowSideEffects=SE_NoSideEffects) const
EvaluateAsInt - Return true if this is a constant which we can fold and convert to an integer...
UnaryOperator - This represents the unary-expression's (except sizeof and alignof), the postinc/postdec operators from postfix-expression, and various extensions.
Definition: Expr.h:1668
void evalLoad(ExplodedNodeSet &Dst, const Expr *NodeEx, const Expr *BoundExpr, ExplodedNode *Pred, ProgramStateRef St, SVal location, const ProgramPointTag *tag=nullptr, QualType LoadTy=QualType())
Simulate a read of the result of Ex.
bool isGLValue() const
Definition: Expr.h:250
The result type of a method or function.
reverse_iterator rbegin()
Definition: CFG.h:510
CFGTerminator getTerminator()
Definition: CFG.h:622
OpaqueValueExpr - An expression referring to an opaque object of a fixed type and value class...
Definition: Expr.h:848
bool isIntegralOrEnumerationType() const
Determine whether this type is an integral or enumeration type.
Definition: Type.h:5730
void VisitGuardedExpr(const Expr *Ex, const Expr *L, const Expr *R, ExplodedNode *Pred, ExplodedNodeSet &Dst)
VisitGuardedExpr - Transfer function logic for ?, __builtin_choose.
DefinedOrUnknownSVal conjureSymbolVal(const void *symbolTag, const Expr *expr, const LocationContext *LCtx, unsigned count)
Create a new symbol with a unique 'name'.
bool isBuiltinType() const
Helper methods to distinguish type categories.
Definition: Type.h:5536
bool isSingleDecl() const
isSingleDecl - This method returns true if this DeclStmt refers to a single Decl. ...
Definition: Stmt.h:457
bool isConstantSizeType() const
Return true if this is not a variable sized type, according to the rules of C99 6.7.5p3.
Definition: Type.cpp:1882
capture_const_iterator capture_end() const
Definition: Decl.h:3584
DeclStmt - Adaptor class for mixing declarations with statements and expressions. ...
Definition: Stmt.h:443
void VisitCompoundLiteralExpr(const CompoundLiteralExpr *CL, ExplodedNode *Pred, ExplodedNodeSet &Dst)
VisitCompoundLiteralExpr - Transfer function logic for compound literals.
llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx, SmallVectorImpl< PartialDiagnosticAt > *Diag=nullptr) const
EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded integer.
SVal - This represents a symbolic expression, which can be either an L-value or an R-value...
Definition: SVals.h:46
decl_iterator decl_begin()
Definition: Stmt.h:495
void VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *Ex, ExplodedNode *Pred, ExplodedNodeSet &Dst)
VisitUnaryExprOrTypeTraitExpr - Transfer function for sizeof.
bool isVectorType() const
Definition: Type.h:5548
BasicValueFactory & getBasicVals()
Definition: ExprEngine.h:314
void runCheckersForPreStmt(ExplodedNodeSet &Dst, const ExplodedNodeSet &Src, const Stmt *S, ExprEngine &Eng)
Run checkers for pre-visiting Stmts.
const BlockDecl * getBlockDecl() const
Definition: Expr.h:4581
Opcode getOpcode() const
Definition: Expr.h:1692
void insert(const ExplodedNodeSet &S)
QualType getType() const
Definition: Expr.h:126
void VisitIncrementDecrementOperator(const UnaryOperator *U, ExplodedNode *Pred, ExplodedNodeSet &Dst)
Handle ++ and – (both pre- and post-increment).
SValBuilder & getSValBuilder()
Definition: ExprEngine.h:131
void addNodes(const ExplodedNodeSet &S)
Definition: CoreEngine.h:306
StoreManager & getStoreManager()
Definition: ExprEngine.h:307
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
detail::InMemoryDirectory::const_iterator E
const MemRegion * getAsRegion() const
Definition: SVals.cpp:135
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:1966
ExplicitCastExpr - An explicit cast written in the source code.
Definition: Expr.h:2800
Optional< T > getAs() const
Convert to the specified ProgramPoint type, returning None if this ProgramPoint is not of the desired...
Definition: ProgramPoint.h:150
Stmt * getStmt()
Definition: CFG.h:310
const T * getAs() const
Member-template getAs<specific type>'.
Definition: Type.h:5818
SVal evalMinus(SVal X)
Definition: ExprEngine.h:477
QualType getTypeOfArgument() const
Gets the argument type, or the type of the argument expression, whichever is appropriate.
Definition: Expr.h:2037
bool isUnknown() const
Definition: SVals.h:117
static bool isAdditiveOp(Opcode Opc)
Definition: Expr.h:2975
const Expr * getInitializer() const
Definition: Expr.h:2588
static bool isIncrementOp(Opcode Op)
Definition: Expr.h:1715
reverse_iterator rend()
Definition: Expr.h:3926
X
Add a minimal nested name specifier fixit hint to allow lookup of a tag name from an outer enclosing ...
Definition: SemaDecl.cpp:12171
void VisitBlockExpr(const BlockExpr *BE, ExplodedNode *Pred, ExplodedNodeSet &Dst)
VisitBlockExpr - Transfer function logic for BlockExprs.
static bool isCompoundAssignmentOp(Opcode Opc)
Definition: Expr.h:3027
DefinedOrUnknownSVal evalEQ(ProgramStateRef state, DefinedOrUnknownSVal lhs, DefinedOrUnknownSVal rhs)
Opcode getOpcode() const
Definition: Expr.h:2940
pred_iterator pred_begin()
CFGElement - Represents a top-level expression in a basic block.
Definition: CFG.h:53
This class is used for builtin types like 'int'.
Definition: Type.h:2039
CFGTerminator - Represents CFGBlock terminator statement.
Definition: CFG.h:303
bool isArrayType() const
Definition: Type.h:5521
Expr * getRHS() const
Definition: Expr.h:2945
ExplodedNode * generateNode(const Stmt *S, ExplodedNode *Pred, ProgramStateRef St, const ProgramPointTag *tag=nullptr, ProgramPoint::Kind K=ProgramPoint::PostStmtKind)
Definition: CoreEngine.h:378
const LangOptions & getLangOpts() const
const Expr * getInit(unsigned Init) const
Definition: Expr.h:3785
bool empty() const
Definition: CFG.h:516
OffsetOfExpr - [C99 7.17] - This represents an expression of the form offsetof(record-type, member-designator).
Definition: Expr.h:1874
void VisitBinaryOperator(const BinaryOperator *B, ExplodedNode *Pred, ExplodedNodeSet &Dst)
VisitBinaryOperator - Transfer function logic for binary operators.
Definition: ExprEngineC.cpp:22
bool isSignedIntegerType() const
Return true if this is an integer type that is signed, according to C99 6.2.5p4 [char, signed char, short, int, long..], or an enum decl which has a signed representation.
Definition: Type.cpp:1706
T castAs() const
Convert to the specified SVal type, asserting that this SVal is of the desired type.
Definition: SVals.h:75
llvm::ImmutableList< SVal > getEmptySValList()
Expr * IgnoreParens() LLVM_READONLY
IgnoreParens - Ignore parentheses.
Definition: Expr.cpp:2295