ExprEngineCallAndReturn.cpp revision 242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6
1294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek//=-- ExprEngineCallAndReturn.cpp - Support for call/return -----*- C++ -*-===// 2294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// 3294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// The LLVM Compiler Infrastructure 4294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// 5294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// This file is distributed under the University of Illinois Open Source 6294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// License. See LICENSE.TXT for details. 7294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// 8294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek//===----------------------------------------------------------------------===// 9294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// 10294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// This file defines ExprEngine's support for calls and returns. 11294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// 12294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek//===----------------------------------------------------------------------===// 13294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 14294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/StaticAnalyzer/Core/CheckerManager.h" 15294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 16e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose#include "clang/StaticAnalyzer/Core/PathSensitive/ObjCMessage.h" 17294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/AST/DeclCXX.h" 18294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 19294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing namespace clang; 20294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing namespace ento; 21294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 22294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremeneknamespace { 23294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Trait class for recording returned expression in the state. 24294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek struct ReturnExpr { 25294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek static int TagInt; 26294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek typedef const Stmt *data_type; 27294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek }; 28294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek int ReturnExpr::TagInt; 29294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 30294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 31294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::processCallEnter(CallEnterNodeBuilder &B) { 32294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const ProgramState *state = 33294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek B.getState()->enterStackFrame(B.getCalleeContext()); 34294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek B.generateNode(state); 35294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 36294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 37894212e9510299abb203801e014fec76b7926a05Ted Kremenekvoid ExprEngine::processCallExit(ExplodedNode *Pred) { 38894212e9510299abb203801e014fec76b7926a05Ted Kremenek const ProgramState *state = Pred->getState(); 39294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const StackFrameContext *calleeCtx = 40894212e9510299abb203801e014fec76b7926a05Ted Kremenek Pred->getLocationContext()->getCurrentStackFrame(); 41294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Stmt *CE = calleeCtx->getCallSite(); 42294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 43294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // If the callee returns an expression, bind its value to CallExpr. 44294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Stmt *ReturnedExpr = state->get<ReturnExpr>(); 45294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (ReturnedExpr) { 465eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 475eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal RetVal = state->getSVal(ReturnedExpr, LCtx); 485eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CE, LCtx, RetVal); 49294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Clear the return expr GDM. 50294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek state = state->remove<ReturnExpr>(); 51294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 52294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 53294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Bind the constructed object value to CXXConstructExpr. 54294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (const CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(CE)) { 55294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const CXXThisRegion *ThisR = 56294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCXXThisRegion(CCE->getConstructor()->getParent(), calleeCtx); 57294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 58294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal ThisV = state->getSVal(ThisR); 59294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Always bind the region to the CXXConstructExpr. 605eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CCE, Pred->getLocationContext(), ThisV); 61294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 62894212e9510299abb203801e014fec76b7926a05Ted Kremenek 63294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 64894212e9510299abb203801e014fec76b7926a05Ted Kremenek PostStmt Loc(CE, calleeCtx->getParent()); 65894212e9510299abb203801e014fec76b7926a05Ted Kremenek bool isNew; 66894212e9510299abb203801e014fec76b7926a05Ted Kremenek ExplodedNode *N = G.getNode(Loc, state, false, &isNew); 67894212e9510299abb203801e014fec76b7926a05Ted Kremenek N->addPredecessor(Pred, G); 68894212e9510299abb203801e014fec76b7926a05Ted Kremenek if (!isNew) 69894212e9510299abb203801e014fec76b7926a05Ted Kremenek return; 70894212e9510299abb203801e014fec76b7926a05Ted Kremenek 71894212e9510299abb203801e014fec76b7926a05Ted Kremenek // Perform the post-condition check of the CallExpr. 72894212e9510299abb203801e014fec76b7926a05Ted Kremenek ExplodedNodeSet Dst; 73894212e9510299abb203801e014fec76b7926a05Ted Kremenek getCheckerManager().runCheckersForPostStmt(Dst, N, CE, *this); 74894212e9510299abb203801e014fec76b7926a05Ted Kremenek 75242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek // Enqueue the next element in the block. 76242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek for (ExplodedNodeSet::iterator I = Dst.begin(), E = Dst.end(); I != E; ++I) { 77242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek Engine.getWorkList()->enqueue(*I, 78242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek calleeCtx->getCallSiteBlock(), 79242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek calleeCtx->getIndex()+1); 80242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek } 81294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 82294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 832cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaksstatic bool isPointerToConst(const ParmVarDecl *ParamDecl) { 842cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks QualType PointeeTy = ParamDecl->getOriginalType()->getPointeeType(); 852cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (PointeeTy != QualType() && PointeeTy.isConstQualified() && 862cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks !PointeeTy->isAnyPointerType() && !PointeeTy->isReferenceType()) { 872cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return true; 882cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 892cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return false; 902cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks} 912cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 922cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks// Try to retrieve the function declaration and find the function parameter 932cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks// types which are pointers/references to a non-pointer const. 942cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks// We do not invalidate the corresponding argument regions. 952cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaksstatic void findPtrToConstParams(llvm::SmallSet<unsigned, 1> &PreserveArgs, 962cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks const CallOrObjCMessage &Call) { 972cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks const Decl *CallDecl = Call.getDecl(); 982cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (!CallDecl) 992cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return; 1002cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 1012cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(CallDecl)) { 1022cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks for (unsigned Idx = 0, E = Call.getNumArgs(); Idx != E; ++Idx) { 1032cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (FDecl && Idx < FDecl->getNumParams()) { 1042cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (isPointerToConst(FDecl->getParamDecl(Idx))) 1052cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks PreserveArgs.insert(Idx); 1062cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 1072cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 1082cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return; 1092cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 1102cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 1112cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (const ObjCMethodDecl *MDecl = dyn_cast<ObjCMethodDecl>(CallDecl)) { 1122cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks assert(MDecl->param_size() <= Call.getNumArgs()); 1132cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks unsigned Idx = 0; 1142cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks for (clang::ObjCMethodDecl::param_const_iterator 1152cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks I = MDecl->param_begin(), E = MDecl->param_end(); I != E; ++I, ++Idx) { 1162cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (isPointerToConst(*I)) 1172cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks PreserveArgs.insert(Idx); 1182cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 1192cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return; 1202cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 1212cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks} 1222cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 123e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Roseconst ProgramState * 124e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy RoseExprEngine::invalidateArguments(const ProgramState *State, 125e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose const CallOrObjCMessage &Call, 126e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose const LocationContext *LC) { 127e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose SmallVector<const MemRegion *, 8> RegionsToInvalidate; 128e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 129e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (Call.isObjCMessage()) { 130e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate all instance variables of the receiver of an ObjC message. 131e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We should be able to do better with inter-procedural analysis. 132e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (const MemRegion *MR = Call.getInstanceMessageReceiver(LC).getAsRegion()) 133e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose RegionsToInvalidate.push_back(MR); 134e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 135e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } else if (Call.isCXXCall()) { 136e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate all instance variables for the callee of a C++ method call. 137e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We should be able to do better with inter-procedural analysis. 138e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We can probably do better for const versus non-const methods. 139e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (const MemRegion *Callee = Call.getCXXCallee().getAsRegion()) 140e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose RegionsToInvalidate.push_back(Callee); 141e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 142e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } else if (Call.isFunctionCall()) { 143e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Block calls invalidate all captured-by-reference values. 1442cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks SVal CalleeVal = Call.getFunctionCallee(); 1452cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (const MemRegion *Callee = CalleeVal.getAsRegion()) { 146e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (isa<BlockDataRegion>(Callee)) 147e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose RegionsToInvalidate.push_back(Callee); 148e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 149e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 150e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 1512cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks // Indexes of arguments whose values will be preserved by the call. 1522cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks llvm::SmallSet<unsigned, 1> PreserveArgs; 1532cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks findPtrToConstParams(PreserveArgs, Call); 1542cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 155e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose for (unsigned idx = 0, e = Call.getNumArgs(); idx != e; ++idx) { 1562cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (PreserveArgs.count(idx)) 1572cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks continue; 1582cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 159e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose SVal V = Call.getArgSVal(idx); 160e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 161e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // If we are passing a location wrapped as an integer, unwrap it and 162e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // invalidate the values referred by the location. 163e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (nonloc::LocAsInteger *Wrapped = dyn_cast<nonloc::LocAsInteger>(&V)) 164e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose V = Wrapped->getLoc(); 165e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose else if (!isa<Loc>(V)) 166e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose continue; 167e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 168e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (const MemRegion *R = V.getAsRegion()) { 169e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate the value of the variable passed by reference. 170e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 171e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Are we dealing with an ElementRegion? If the element type is 1722cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks // a basic integer type (e.g., char, int) and the underlying region 173e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // is a variable region then strip off the ElementRegion. 174e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We really need to think about this for the general case 175e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // as sometimes we are reasoning about arrays and other times 176e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // about (char*), etc., is just a form of passing raw bytes. 177e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // e.g., void *p = alloca(); foo((char*)p); 178e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (const ElementRegion *ER = dyn_cast<ElementRegion>(R)) { 179e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Checking for 'integral type' is probably too promiscuous, but 180e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // we'll leave it in for now until we have a systematic way of 181e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // handling all of these cases. Eventually we need to come up 182e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // with an interface to StoreManager so that this logic can be 1832cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks // appropriately delegated to the respective StoreManagers while 184e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // still allowing us to do checker-specific logic (e.g., 185e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // invalidating reference counts), probably via callbacks. 186e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (ER->getElementType()->isIntegralOrEnumerationType()) { 187e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose const MemRegion *superReg = ER->getSuperRegion(); 188e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (isa<VarRegion>(superReg) || isa<FieldRegion>(superReg) || 189e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose isa<ObjCIvarRegion>(superReg)) 190e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose R = cast<TypedRegion>(superReg); 191e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 192e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: What about layers of ElementRegions? 193e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 194e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 195e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Mark this region for invalidation. We batch invalidate regions 196e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // below for efficiency. 197e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose RegionsToInvalidate.push_back(R); 198e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } else { 199e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Nuke all other arguments passed by reference. 200e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: is this necessary or correct? This handles the non-Region 201e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // cases. Is it ever valid to store to these? 202e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose State = State->unbindLoc(cast<Loc>(V)); 203e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 204e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 205e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 206e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate designated regions using the batch invalidation API. 207e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 208e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We can have collisions on the conjured symbol if the 209e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // expression *I also creates conjured symbols. We probably want 210e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // to identify conjured symbols by an expression pair: the enclosing 211e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // expression (the context) and the expression itself. This should 212e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // disambiguate conjured symbols. 213ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks unsigned Count = currentBuilderContext->getCurrentBlockCount(); 214e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose StoreManager::InvalidatedSymbols IS; 215e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 216e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // NOTE: Even if RegionsToInvalidate is empty, we may still invalidate 217e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // global variables. 218e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose return State->invalidateRegions(RegionsToInvalidate, 219e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose Call.getOriginExpr(), Count, 220eb31a76d1cdaaf8874c549dc6bd964ff270d3822Anna Zaks &IS, &Call); 221e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 222e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose} 223e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 224294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCallExpr(const CallExpr *CE, ExplodedNode *Pred, 225294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &dst) { 226294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Perform the previsit of the CallExpr. 227294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreVisit; 228294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, CE, *this); 229294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 230294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Now evaluate the call itself. 231294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek class DefaultEval : public GraphExpander { 232294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExprEngine &Eng; 233294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const CallExpr *CE; 234294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek public: 235294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 236294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek DefaultEval(ExprEngine &eng, const CallExpr *ce) 237294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek : Eng(eng), CE(ce) {} 238294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek virtual void expandGraph(ExplodedNodeSet &Dst, ExplodedNode *Pred) { 239294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Should we inline the call? 240294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (Eng.getAnalysisManager().shouldInlineCall() && 241294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Eng.InlineCall(Dst, CE, Pred)) { 242294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 243294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 244500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 245500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose // First handle the return value. 246aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder Bldr(Pred, Dst, *Eng.currentBuilderContext); 247500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 248500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose // Get the callee. 249294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Callee = CE->getCallee()->IgnoreParens(); 250294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const ProgramState *state = Pred->getState(); 2515eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal L = state->getSVal(Callee, Pred->getLocationContext()); 252500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 253500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose // Figure out the result type. We do this dance to handle references. 254500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose QualType ResultTy; 255500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose if (const FunctionDecl *FD = L.getAsFunctionDecl()) 256500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose ResultTy = FD->getResultType(); 257500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose else 258500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose ResultTy = CE->getType(); 259500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 260500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose if (CE->isLValue()) 261500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose ResultTy = Eng.getContext().getPointerType(ResultTy); 262500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 263500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose // Conjure a symbol value to use as the result. 264500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose SValBuilder &SVB = Eng.getSValBuilder(); 265ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks unsigned Count = Eng.currentBuilderContext->getCurrentBlockCount(); 266500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose SVal RetVal = SVB.getConjuredSymbolVal(0, CE, ResultTy, Count); 267500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 268e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Generate a new state with the return value set. 2695eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 2705eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CE, LCtx, RetVal); 271e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 272e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate the arguments. 2735eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = Eng.invalidateArguments(state, CallOrObjCMessage(CE, state, LCtx), 2745eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek LCtx); 275500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 276fe27971d54d26997149d6b84057f04ff398d1d5dJordy Rose // And make the result node. 277ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CE, Pred, state); 278294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 279294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek }; 280294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 281294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Finally, evaluate the function call. We try each of the checkers 282294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // to see if the can evaluate the function call. 283294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstCallEvaluated; 284294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek DefaultEval defEval(*this, CE); 285294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForEvalCall(dstCallEvaluated, 286294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek dstPreVisit, 287294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek CE, *this, &defEval); 288294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 289294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Finally, perform the post-condition check of the CallExpr and store 290294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // the created nodes in 'Dst'. 291294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPostStmt(dst, dstCallEvaluated, CE, 292294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek *this); 293294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 294294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 295294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitReturnStmt(const ReturnStmt *RS, ExplodedNode *Pred, 296294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 297294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet Src; 298ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks { 299aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder Bldr(Pred, Src, *currentBuilderContext); 300ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks if (const Expr *RetE = RS->getRetValue()) { 301ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks // Record the returned expression in the state. It will be used in 302ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks // processCallExit to bind the return value to the call expr. 303ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks { 304ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks static SimpleProgramPointTag tag("ExprEngine: ReturnStmt"); 305ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks const ProgramState *state = Pred->getState(); 306ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks state = state->set<ReturnExpr>(RetE); 307ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Pred = Bldr.generateNode(RetE, Pred, state, false, &tag); 308ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks } 309ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks // We may get a NULL Pred because we generated a cached node. 310ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks if (Pred) { 311ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.takeNodes(Pred); 312ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks ExplodedNodeSet Tmp; 313ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Visit(RetE, Pred, Tmp); 314ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.addNodes(Tmp); 315ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks } 316294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 317294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 318294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 319fe27971d54d26997149d6b84057f04ff398d1d5dJordy Rose getCheckerManager().runCheckersForPreStmt(Dst, Src, RS, *this); 320294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 321