C++ ProgramStateRef::bindDefault方法代码示例

void ExprEngine::VisitCXXConstructExpr(const CXXConstructExpr *CE,
                                       ExplodedNode *Pred,
                                       ExplodedNodeSet &destNodes) {
  const LocationContext *LCtx = Pred->getLocationContext();
  ProgramStateRef State = Pred->getState();

  const MemRegion *Target = nullptr;

  // FIXME: Handle arrays, which run the same constructor for every element.
  // For now, we just run the first constructor (which should still invalidate
  // the entire array).

  switch (CE->getConstructionKind()) {
  case CXXConstructExpr::CK_Complete: {
    Target = getRegionForConstructedObject(CE, Pred, *this, currStmtIdx);
    break;
  }
  case CXXConstructExpr::CK_VirtualBase:
    // Make sure we are not calling virtual base class initializers twice.
    // Only the most-derived object should initialize virtual base classes.
    if (const Stmt *Outer = LCtx->getCurrentStackFrame()->getCallSite()) {
      const CXXConstructExpr *OuterCtor = dyn_cast<CXXConstructExpr>(Outer);
      if (OuterCtor) {
        switch (OuterCtor->getConstructionKind()) {
        case CXXConstructExpr::CK_NonVirtualBase:
        case CXXConstructExpr::CK_VirtualBase:
          // Bail out!
          destNodes.Add(Pred);
          return;
        case CXXConstructExpr::CK_Complete:
        case CXXConstructExpr::CK_Delegating:
          break;
        }
      }
    }
    // FALLTHROUGH
  case CXXConstructExpr::CK_NonVirtualBase:
  case CXXConstructExpr::CK_Delegating: {
    const CXXMethodDecl *CurCtor = cast<CXXMethodDecl>(LCtx->getDecl());
    Loc ThisPtr = getSValBuilder().getCXXThis(CurCtor,
                                              LCtx->getCurrentStackFrame());
    SVal ThisVal = State->getSVal(ThisPtr);

    if (CE->getConstructionKind() == CXXConstructExpr::CK_Delegating) {
      Target = ThisVal.getAsRegion();
    } else {
      // Cast to the base type.
      bool IsVirtual =
        (CE->getConstructionKind() == CXXConstructExpr::CK_VirtualBase);
      SVal BaseVal = getStoreManager().evalDerivedToBase(ThisVal, CE->getType(),
                                                         IsVirtual);
      Target = BaseVal.getAsRegion();
    }
    break;
  }
  }

  CallEventManager &CEMgr = getStateManager().getCallEventManager();
  CallEventRef<CXXConstructorCall> Call =
    CEMgr.getCXXConstructorCall(CE, Target, State, LCtx);

  ExplodedNodeSet DstPreVisit;
  getCheckerManager().runCheckersForPreStmt(DstPreVisit, Pred, CE, *this);

  ExplodedNodeSet PreInitialized;
  {
    StmtNodeBuilder Bldr(DstPreVisit, PreInitialized, *currBldrCtx);
    if (CE->requiresZeroInitialization()) {
      // Type of the zero doesn't matter.
      SVal ZeroVal = svalBuilder.makeZeroVal(getContext().CharTy);

      for (ExplodedNodeSet::iterator I = DstPreVisit.begin(),
                                     E = DstPreVisit.end();
           I != E; ++I) {
        ProgramStateRef State = (*I)->getState();
        // FIXME: Once we properly handle constructors in new-expressions, we'll
        // need to invalidate the region before setting a default value, to make
        // sure there aren't any lingering bindings around. This probably needs
        // to happen regardless of whether or not the object is zero-initialized
        // to handle random fields of a placement-initialized object picking up
        // old bindings. We might only want to do it when we need to, though.
        // FIXME: This isn't actually correct for arrays -- we need to zero-
        // initialize the entire array, not just the first element -- but our
        // handling of arrays everywhere else is weak as well, so this shouldn't
        // actually make things worse. Placement new makes this tricky as well,
        // since it's then possible to be initializing one part of a multi-
        // dimensional array.
        State = State->bindDefault(loc::MemRegionVal(Target), ZeroVal);
        Bldr.generateNode(CE, *I, State, /*tag=*/nullptr,
                          ProgramPoint::PreStmtKind);
      }
    }
  }

  ExplodedNodeSet DstPreCall;
  getCheckerManager().runCheckersForPreCall(DstPreCall, PreInitialized,
                                            *Call, *this);

  ExplodedNodeSet DstEvaluated;
  StmtNodeBuilder Bldr(DstPreCall, DstEvaluated, *currBldrCtx);
//.........这里部分代码省略.........