| //===- ExprEngineCXX.cpp - ExprEngine support for C++ -----------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines the C++ expression evaluation engine. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/StaticAnalyzer/Core/CheckerManager.h" |
| #include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h" |
| #include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" |
| #include "clang/StaticAnalyzer/Core/PathSensitive/Calls.h" |
| #include "clang/AST/DeclCXX.h" |
| #include "clang/AST/StmtCXX.h" |
| |
| using namespace clang; |
| using namespace ento; |
| |
| void ExprEngine::CreateCXXTemporaryObject(const MaterializeTemporaryExpr *ME, |
| ExplodedNode *Pred, |
| ExplodedNodeSet &Dst) { |
| StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); |
| const Expr *tempExpr = ME->GetTemporaryExpr()->IgnoreParens(); |
| ProgramStateRef state = Pred->getState(); |
| const LocationContext *LCtx = Pred->getLocationContext(); |
| |
| // Bind the temporary object to the value of the expression. Then bind |
| // the expression to the location of the object. |
| SVal V = state->getSVal(tempExpr, Pred->getLocationContext()); |
| |
| const MemRegion *R = |
| svalBuilder.getRegionManager().getCXXTempObjectRegion(ME, LCtx); |
| |
| state = state->bindLoc(loc::MemRegionVal(R), V); |
| Bldr.generateNode(ME, Pred, state->BindExpr(ME, LCtx, loc::MemRegionVal(R))); |
| } |
| |
| void ExprEngine::VisitCXXConstructExpr(const CXXConstructExpr *CE, |
| const MemRegion *Dest, |
| ExplodedNode *Pred, |
| ExplodedNodeSet &destNodes) { |
| CXXConstructorCall Call(CE, Dest, Pred->getState(), |
| Pred->getLocationContext()); |
| |
| ExplodedNodeSet DstPreVisit; |
| getCheckerManager().runCheckersForPreStmt(DstPreVisit, Pred, CE, *this); |
| ExplodedNodeSet DstPreCall; |
| getCheckerManager().runCheckersForPreCall(DstPreCall, DstPreVisit, |
| Call, *this); |
| |
| ExplodedNodeSet DstInvalidated; |
| for (ExplodedNodeSet::iterator I = DstPreCall.begin(), E = DstPreCall.end(); |
| I != E; ++I) |
| defaultEvalCall(DstInvalidated, *I, Call); |
| |
| ExplodedNodeSet DstPostCall; |
| getCheckerManager().runCheckersForPostCall(DstPostCall, DstInvalidated, |
| Call, *this); |
| getCheckerManager().runCheckersForPostStmt(destNodes, DstPostCall, CE, *this); |
| } |
| |
| void ExprEngine::VisitCXXDestructor(const CXXDestructorDecl *DD, |
| const MemRegion *Dest, |
| const Stmt *S, |
| ExplodedNode *Pred, |
| ExplodedNodeSet &Dst) { |
| CXXDestructorCall Call(DD, S, Dest, Pred->getState(), |
| Pred->getLocationContext()); |
| |
| ExplodedNodeSet DstPreCall; |
| getCheckerManager().runCheckersForPreCall(DstPreCall, Pred, |
| Call, *this); |
| |
| ExplodedNodeSet DstInvalidated; |
| for (ExplodedNodeSet::iterator I = DstPreCall.begin(), E = DstPreCall.end(); |
| I != E; ++I) |
| defaultEvalCall(DstInvalidated, *I, Call); |
| |
| ExplodedNodeSet DstPostCall; |
| getCheckerManager().runCheckersForPostCall(Dst, DstInvalidated, |
| Call, *this); |
| } |
| |
| void ExprEngine::VisitCXXNewExpr(const CXXNewExpr *CNE, ExplodedNode *Pred, |
| ExplodedNodeSet &Dst) { |
| // FIXME: Much of this should eventually migrate to CXXAllocatorCall. |
| // Also, we need to decide how allocators actually work -- they're not |
| // really part of the CXXNewExpr because they happen BEFORE the |
| // CXXConstructExpr subexpression. See PR12014 for some discussion. |
| StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); |
| |
| unsigned blockCount = currentBuilderContext->getCurrentBlockCount(); |
| const LocationContext *LCtx = Pred->getLocationContext(); |
| DefinedOrUnknownSVal symVal = |
| svalBuilder.getConjuredSymbolVal(0, CNE, LCtx, CNE->getType(), blockCount); |
| ProgramStateRef State = Pred->getState(); |
| |
| // Invalidate placement args. |
| CXXAllocatorCall Call(CNE, State, LCtx); |
| State = Call.invalidateRegions(blockCount); |
| |
| if (CNE->isArray()) { |
| // FIXME: allocating an array requires simulating the constructors. |
| // For now, just return a symbolicated region. |
| const MemRegion *NewReg = cast<loc::MemRegionVal>(symVal).getRegion(); |
| QualType ObjTy = CNE->getType()->getAs<PointerType>()->getPointeeType(); |
| const ElementRegion *EleReg = |
| getStoreManager().GetElementZeroRegion(NewReg, ObjTy); |
| State = State->BindExpr(CNE, Pred->getLocationContext(), |
| loc::MemRegionVal(EleReg)); |
| Bldr.generateNode(CNE, Pred, State); |
| return; |
| } |
| |
| // FIXME: Once we have proper support for CXXConstructExprs inside |
| // CXXNewExpr, we need to make sure that the constructed object is not |
| // immediately invalidated here. (The placement call should happen before |
| // the constructor call anyway.) |
| FunctionDecl *FD = CNE->getOperatorNew(); |
| if (FD && FD->isReservedGlobalPlacementOperator()) { |
| // Non-array placement new should always return the placement location. |
| SVal PlacementLoc = State->getSVal(CNE->getPlacementArg(0), LCtx); |
| State = State->BindExpr(CNE, LCtx, PlacementLoc); |
| } else { |
| State = State->BindExpr(CNE, LCtx, symVal); |
| } |
| |
| // If the type is not a record, we won't have a CXXConstructExpr as an |
| // initializer. Copy the value over. |
| if (const Expr *Init = CNE->getInitializer()) { |
| if (!isa<CXXConstructExpr>(Init)) { |
| QualType ObjTy = CNE->getType()->getAs<PointerType>()->getPointeeType(); |
| (void)ObjTy; |
| assert(!ObjTy->isRecordType()); |
| SVal Location = State->getSVal(CNE, LCtx); |
| if (isa<Loc>(Location)) |
| State = State->bindLoc(cast<Loc>(Location), State->getSVal(Init, LCtx)); |
| } |
| } |
| |
| Bldr.generateNode(CNE, Pred, State); |
| } |
| |
| void ExprEngine::VisitCXXDeleteExpr(const CXXDeleteExpr *CDE, |
| ExplodedNode *Pred, ExplodedNodeSet &Dst) { |
| StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); |
| ProgramStateRef state = Pred->getState(); |
| Bldr.generateNode(CDE, Pred, state); |
| } |
| |
| void ExprEngine::VisitCXXCatchStmt(const CXXCatchStmt *CS, |
| ExplodedNode *Pred, |
| ExplodedNodeSet &Dst) { |
| const VarDecl *VD = CS->getExceptionDecl(); |
| if (!VD) { |
| Dst.Add(Pred); |
| return; |
| } |
| |
| const LocationContext *LCtx = Pred->getLocationContext(); |
| SVal V = svalBuilder.getConjuredSymbolVal(CS, LCtx, VD->getType(), |
| currentBuilderContext->getCurrentBlockCount()); |
| ProgramStateRef state = Pred->getState(); |
| state = state->bindLoc(state->getLValue(VD, LCtx), V); |
| |
| StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); |
| Bldr.generateNode(CS, Pred, state); |
| } |
| |
| void ExprEngine::VisitCXXThisExpr(const CXXThisExpr *TE, ExplodedNode *Pred, |
| ExplodedNodeSet &Dst) { |
| StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); |
| |
| // Get the this object region from StoreManager. |
| const LocationContext *LCtx = Pred->getLocationContext(); |
| const MemRegion *R = |
| svalBuilder.getRegionManager().getCXXThisRegion( |
| getContext().getCanonicalType(TE->getType()), |
| LCtx); |
| |
| ProgramStateRef state = Pred->getState(); |
| SVal V = state->getSVal(loc::MemRegionVal(R)); |
| Bldr.generateNode(TE, Pred, state->BindExpr(TE, LCtx, V)); |
| } |