ExprEngineCXX.cpp revision 70cbf3cc09eb21db1108396d30a414ea66d842cc
1//===- ExprEngineCXX.cpp - ExprEngine support for C++ -----------*- 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 the C++ expression evaluation engine. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/StaticAnalyzer/Core/CheckerManager.h" 15#include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h" 16#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 17#include "clang/StaticAnalyzer/Core/PathSensitive/Calls.h" 18#include "clang/AST/DeclCXX.h" 19#include "clang/AST/StmtCXX.h" 20 21using namespace clang; 22using namespace ento; 23 24void ExprEngine::CreateCXXTemporaryObject(const MaterializeTemporaryExpr *ME, 25 ExplodedNode *Pred, 26 ExplodedNodeSet &Dst) { 27 StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); 28 const Expr *tempExpr = ME->GetTemporaryExpr()->IgnoreParens(); 29 ProgramStateRef state = Pred->getState(); 30 const LocationContext *LCtx = Pred->getLocationContext(); 31 32 // Bind the temporary object to the value of the expression. Then bind 33 // the expression to the location of the object. 34 SVal V = state->getSVal(tempExpr, Pred->getLocationContext()); 35 36 const MemRegion *R = 37 svalBuilder.getRegionManager().getCXXTempObjectRegion(ME, LCtx); 38 39 state = state->bindLoc(loc::MemRegionVal(R), V); 40 Bldr.generateNode(ME, Pred, state->BindExpr(ME, LCtx, loc::MemRegionVal(R))); 41} 42 43void ExprEngine::VisitCXXTemporaryObjectExpr(const CXXTemporaryObjectExpr *expr, 44 ExplodedNode *Pred, 45 ExplodedNodeSet &Dst) { 46 VisitCXXConstructExpr(expr, 0, Pred, Dst); 47} 48 49void ExprEngine::VisitCXXConstructExpr(const CXXConstructExpr *CE, 50 const MemRegion *Dest, 51 ExplodedNode *Pred, 52 ExplodedNodeSet &destNodes) { 53 CXXConstructorCall Call(CE, Dest, Pred->getState(), 54 Pred->getLocationContext()); 55 56 ExplodedNodeSet DstPreVisit; 57 getCheckerManager().runCheckersForPreStmt(DstPreVisit, Pred, CE, *this); 58 ExplodedNodeSet DstPreCall; 59 getCheckerManager().runCheckersForPreCall(DstPreCall, DstPreVisit, 60 Call, *this); 61 62 ExplodedNodeSet DstInvalidated; 63 for (ExplodedNodeSet::iterator I = DstPreCall.begin(), E = DstPreCall.end(); 64 I != E; ++I) 65 defaultEvalCall(DstInvalidated, *I, Call); 66 67 ExplodedNodeSet DstPostCall; 68 getCheckerManager().runCheckersForPostCall(DstPostCall, DstInvalidated, 69 Call, *this); 70 getCheckerManager().runCheckersForPostStmt(destNodes, DstPostCall, CE, *this); 71} 72 73void ExprEngine::VisitCXXDestructor(const CXXDestructorDecl *DD, 74 const MemRegion *Dest, 75 const Stmt *S, 76 ExplodedNode *Pred, 77 ExplodedNodeSet &Dst) { 78 StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); 79 if (!(DD->doesThisDeclarationHaveABody() && AMgr.shouldInlineCall())) 80 return; 81 82 // Create the context for 'this' region. 83 const StackFrameContext *SFC = 84 AnalysisDeclContexts.getContext(DD)-> 85 getStackFrame(Pred->getLocationContext(), S, 86 currentBuilderContext->getBlock(), currentStmtIdx); 87 88 CallEnter PP(S, SFC, Pred->getLocationContext()); 89 ProgramStateRef state = Pred->getState(); 90 state = state->bindLoc(svalBuilder.getCXXThis(DD->getParent(), SFC), 91 loc::MemRegionVal(Dest)); 92 Bldr.generateNode(PP, Pred, state); 93} 94 95void ExprEngine::VisitCXXNewExpr(const CXXNewExpr *CNE, ExplodedNode *Pred, 96 ExplodedNodeSet &Dst) { 97 // FIXME: Much of this should eventually migrate to CXXAllocatorCall. 98 // Also, we need to decide how allocators actually work -- they're not 99 // really part of the CXXNewExpr because they happen BEFORE the 100 // CXXConstructExpr subexpression. See PR12014 for some discussion. 101 StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); 102 103 unsigned blockCount = currentBuilderContext->getCurrentBlockCount(); 104 const LocationContext *LCtx = Pred->getLocationContext(); 105 DefinedOrUnknownSVal symVal = 106 svalBuilder.getConjuredSymbolVal(0, CNE, LCtx, CNE->getType(), blockCount); 107 ProgramStateRef State = Pred->getState(); 108 109 // Invalidate placement args. 110 CXXAllocatorCall Call(CNE, State, LCtx); 111 State = Call.invalidateRegions(blockCount); 112 113 if (CNE->isArray()) { 114 // FIXME: allocating an array requires simulating the constructors. 115 // For now, just return a symbolicated region. 116 const MemRegion *NewReg = cast<loc::MemRegionVal>(symVal).getRegion(); 117 QualType ObjTy = CNE->getType()->getAs<PointerType>()->getPointeeType(); 118 const ElementRegion *EleReg = 119 getStoreManager().GetElementZeroRegion(NewReg, ObjTy); 120 State = State->BindExpr(CNE, Pred->getLocationContext(), 121 loc::MemRegionVal(EleReg)); 122 Bldr.generateNode(CNE, Pred, State); 123 return; 124 } 125 126 // FIXME: Once we have proper support for CXXConstructExprs inside 127 // CXXNewExpr, we need to make sure that the constructed object is not 128 // immediately invalidated here. (The placement call should happen before 129 // the constructor call anyway.) 130 FunctionDecl *FD = CNE->getOperatorNew(); 131 if (FD && FD->isReservedGlobalPlacementOperator()) { 132 // Non-array placement new should always return the placement location. 133 SVal PlacementLoc = State->getSVal(CNE->getPlacementArg(0), LCtx); 134 State = State->BindExpr(CNE, LCtx, PlacementLoc); 135 } else { 136 State = State->BindExpr(CNE, LCtx, symVal); 137 } 138 139 Bldr.generateNode(CNE, Pred, State); 140} 141 142void ExprEngine::VisitCXXDeleteExpr(const CXXDeleteExpr *CDE, 143 ExplodedNode *Pred, ExplodedNodeSet &Dst) { 144 StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); 145 ProgramStateRef state = Pred->getState(); 146 Bldr.generateNode(CDE, Pred, state); 147} 148 149void ExprEngine::VisitCXXCatchStmt(const CXXCatchStmt *CS, 150 ExplodedNode *Pred, 151 ExplodedNodeSet &Dst) { 152 const VarDecl *VD = CS->getExceptionDecl(); 153 if (!VD) { 154 Dst.Add(Pred); 155 return; 156 } 157 158 const LocationContext *LCtx = Pred->getLocationContext(); 159 SVal V = svalBuilder.getConjuredSymbolVal(CS, LCtx, VD->getType(), 160 currentBuilderContext->getCurrentBlockCount()); 161 ProgramStateRef state = Pred->getState(); 162 state = state->bindLoc(state->getLValue(VD, LCtx), V); 163 164 StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); 165 Bldr.generateNode(CS, Pred, state); 166} 167 168void ExprEngine::VisitCXXThisExpr(const CXXThisExpr *TE, ExplodedNode *Pred, 169 ExplodedNodeSet &Dst) { 170 StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); 171 172 // Get the this object region from StoreManager. 173 const LocationContext *LCtx = Pred->getLocationContext(); 174 const MemRegion *R = 175 svalBuilder.getRegionManager().getCXXThisRegion( 176 getContext().getCanonicalType(TE->getType()), 177 LCtx); 178 179 ProgramStateRef state = Pred->getState(); 180 SVal V = state->getSVal(loc::MemRegionVal(R)); 181 Bldr.generateNode(TE, Pred, state->BindExpr(TE, LCtx, V)); 182} 183