ExprEngineCallAndReturn.cpp revision eb31a76d1cdaaf8874c549dc6bd964ff270d3822
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 37294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::processCallExit(CallExitNodeBuilder &B) { 38294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const ProgramState *state = B.getState(); 39294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const ExplodedNode *Pred = B.getPredecessor(); 40294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const StackFrameContext *calleeCtx = 41294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek cast<StackFrameContext>(Pred->getLocationContext()); 42294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Stmt *CE = calleeCtx->getCallSite(); 43294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 44294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // If the callee returns an expression, bind its value to CallExpr. 45294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Stmt *ReturnedExpr = state->get<ReturnExpr>(); 46294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (ReturnedExpr) { 47294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal RetVal = state->getSVal(ReturnedExpr); 48294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek state = state->BindExpr(CE, 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. 60294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek state = state->BindExpr(CCE, ThisV); 61294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 62294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 63294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek B.generateNode(state); 64294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 65294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 662cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaksstatic bool isPointerToConst(const ParmVarDecl *ParamDecl) { 672cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks QualType PointeeTy = ParamDecl->getOriginalType()->getPointeeType(); 682cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (PointeeTy != QualType() && PointeeTy.isConstQualified() && 692cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks !PointeeTy->isAnyPointerType() && !PointeeTy->isReferenceType()) { 702cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return true; 712cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 722cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return false; 732cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks} 742cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 752cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks// Try to retrieve the function declaration and find the function parameter 762cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks// types which are pointers/references to a non-pointer const. 772cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks// We do not invalidate the corresponding argument regions. 782cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaksstatic void findPtrToConstParams(llvm::SmallSet<unsigned, 1> &PreserveArgs, 792cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks const CallOrObjCMessage &Call) { 802cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks const Decl *CallDecl = Call.getDecl(); 812cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (!CallDecl) 822cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return; 832cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 842cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(CallDecl)) { 852cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks for (unsigned Idx = 0, E = Call.getNumArgs(); Idx != E; ++Idx) { 862cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (FDecl && Idx < FDecl->getNumParams()) { 872cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (isPointerToConst(FDecl->getParamDecl(Idx))) 882cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks PreserveArgs.insert(Idx); 892cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 902cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 912cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return; 922cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 932cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 942cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (const ObjCMethodDecl *MDecl = dyn_cast<ObjCMethodDecl>(CallDecl)) { 952cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks assert(MDecl->param_size() <= Call.getNumArgs()); 962cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks unsigned Idx = 0; 972cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks for (clang::ObjCMethodDecl::param_const_iterator 982cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks I = MDecl->param_begin(), E = MDecl->param_end(); I != E; ++I, ++Idx) { 992cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (isPointerToConst(*I)) 1002cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks PreserveArgs.insert(Idx); 1012cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 1022cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return; 1032cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 1042cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks} 1052cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 106e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Roseconst ProgramState * 107e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy RoseExprEngine::invalidateArguments(const ProgramState *State, 108e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose const CallOrObjCMessage &Call, 109e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose const LocationContext *LC) { 110e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose SmallVector<const MemRegion *, 8> RegionsToInvalidate; 111e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 112e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (Call.isObjCMessage()) { 113e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate all instance variables of the receiver of an ObjC message. 114e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We should be able to do better with inter-procedural analysis. 115e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (const MemRegion *MR = Call.getInstanceMessageReceiver(LC).getAsRegion()) 116e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose RegionsToInvalidate.push_back(MR); 117e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 118e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } else if (Call.isCXXCall()) { 119e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate all instance variables for the callee of a C++ method call. 120e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We should be able to do better with inter-procedural analysis. 121e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We can probably do better for const versus non-const methods. 122e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (const MemRegion *Callee = Call.getCXXCallee().getAsRegion()) 123e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose RegionsToInvalidate.push_back(Callee); 124e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 125e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } else if (Call.isFunctionCall()) { 126e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Block calls invalidate all captured-by-reference values. 1272cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks SVal CalleeVal = Call.getFunctionCallee(); 1282cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (const MemRegion *Callee = CalleeVal.getAsRegion()) { 129e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (isa<BlockDataRegion>(Callee)) 130e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose RegionsToInvalidate.push_back(Callee); 131e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 132e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 133e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 1342cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks // Indexes of arguments whose values will be preserved by the call. 1352cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks llvm::SmallSet<unsigned, 1> PreserveArgs; 1362cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks findPtrToConstParams(PreserveArgs, Call); 1372cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 138e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose for (unsigned idx = 0, e = Call.getNumArgs(); idx != e; ++idx) { 1392cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (PreserveArgs.count(idx)) 1402cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks continue; 1412cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 142e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose SVal V = Call.getArgSVal(idx); 143e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 144e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // If we are passing a location wrapped as an integer, unwrap it and 145e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // invalidate the values referred by the location. 146e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (nonloc::LocAsInteger *Wrapped = dyn_cast<nonloc::LocAsInteger>(&V)) 147e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose V = Wrapped->getLoc(); 148e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose else if (!isa<Loc>(V)) 149e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose continue; 150e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 151e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (const MemRegion *R = V.getAsRegion()) { 152e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate the value of the variable passed by reference. 153e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 154e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Are we dealing with an ElementRegion? If the element type is 1552cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks // a basic integer type (e.g., char, int) and the underlying region 156e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // is a variable region then strip off the ElementRegion. 157e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We really need to think about this for the general case 158e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // as sometimes we are reasoning about arrays and other times 159e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // about (char*), etc., is just a form of passing raw bytes. 160e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // e.g., void *p = alloca(); foo((char*)p); 161e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (const ElementRegion *ER = dyn_cast<ElementRegion>(R)) { 162e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Checking for 'integral type' is probably too promiscuous, but 163e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // we'll leave it in for now until we have a systematic way of 164e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // handling all of these cases. Eventually we need to come up 165e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // with an interface to StoreManager so that this logic can be 1662cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks // appropriately delegated to the respective StoreManagers while 167e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // still allowing us to do checker-specific logic (e.g., 168e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // invalidating reference counts), probably via callbacks. 169e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (ER->getElementType()->isIntegralOrEnumerationType()) { 170e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose const MemRegion *superReg = ER->getSuperRegion(); 171e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (isa<VarRegion>(superReg) || isa<FieldRegion>(superReg) || 172e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose isa<ObjCIvarRegion>(superReg)) 173e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose R = cast<TypedRegion>(superReg); 174e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 175e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: What about layers of ElementRegions? 176e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 177e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 178e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Mark this region for invalidation. We batch invalidate regions 179e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // below for efficiency. 180e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose RegionsToInvalidate.push_back(R); 181e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } else { 182e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Nuke all other arguments passed by reference. 183e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: is this necessary or correct? This handles the non-Region 184e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // cases. Is it ever valid to store to these? 185e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose State = State->unbindLoc(cast<Loc>(V)); 186e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 187e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 188e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 189e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate designated regions using the batch invalidation API. 190e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 191e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We can have collisions on the conjured symbol if the 192e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // expression *I also creates conjured symbols. We probably want 193e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // to identify conjured symbols by an expression pair: the enclosing 194e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // expression (the context) and the expression itself. This should 195e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // disambiguate conjured symbols. 196ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks unsigned Count = currentBuilderContext->getCurrentBlockCount(); 197e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose StoreManager::InvalidatedSymbols IS; 198e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 199e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // NOTE: Even if RegionsToInvalidate is empty, we may still invalidate 200e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // global variables. 201e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose return State->invalidateRegions(RegionsToInvalidate, 202e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose Call.getOriginExpr(), Count, 203eb31a76d1cdaaf8874c549dc6bd964ff270d3822Anna Zaks &IS, &Call); 204e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 205e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose} 206e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 207294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCallExpr(const CallExpr *CE, ExplodedNode *Pred, 208294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &dst) { 209294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Perform the previsit of the CallExpr. 210294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreVisit; 211294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, CE, *this); 212294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 213294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Now evaluate the call itself. 214294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek class DefaultEval : public GraphExpander { 215294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExprEngine &Eng; 216294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const CallExpr *CE; 217294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek public: 218294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 219294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek DefaultEval(ExprEngine &eng, const CallExpr *ce) 220294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek : Eng(eng), CE(ce) {} 221294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek virtual void expandGraph(ExplodedNodeSet &Dst, ExplodedNode *Pred) { 222294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Should we inline the call? 223294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (Eng.getAnalysisManager().shouldInlineCall() && 224294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Eng.InlineCall(Dst, CE, Pred)) { 225294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 226294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 227500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 228500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose // First handle the return value. 229aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder Bldr(Pred, Dst, *Eng.currentBuilderContext); 230500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 231500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose // Get the callee. 232294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Callee = CE->getCallee()->IgnoreParens(); 233294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const ProgramState *state = Pred->getState(); 234294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal L = state->getSVal(Callee); 235500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 236500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose // Figure out the result type. We do this dance to handle references. 237500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose QualType ResultTy; 238500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose if (const FunctionDecl *FD = L.getAsFunctionDecl()) 239500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose ResultTy = FD->getResultType(); 240500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose else 241500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose ResultTy = CE->getType(); 242500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 243500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose if (CE->isLValue()) 244500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose ResultTy = Eng.getContext().getPointerType(ResultTy); 245500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 246500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose // Conjure a symbol value to use as the result. 247500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose SValBuilder &SVB = Eng.getSValBuilder(); 248ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks unsigned Count = Eng.currentBuilderContext->getCurrentBlockCount(); 249500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose SVal RetVal = SVB.getConjuredSymbolVal(0, CE, ResultTy, Count); 250500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 251e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Generate a new state with the return value set. 252500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose state = state->BindExpr(CE, RetVal); 253e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 254e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate the arguments. 255e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose const LocationContext *LC = Pred->getLocationContext(); 256e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose state = Eng.invalidateArguments(state, CallOrObjCMessage(CE, state), LC); 257500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 258fe27971d54d26997149d6b84057f04ff398d1d5dJordy Rose // And make the result node. 259ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CE, Pred, state); 260294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 261294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek }; 262294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 263294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Finally, evaluate the function call. We try each of the checkers 264294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // to see if the can evaluate the function call. 265294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstCallEvaluated; 266294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek DefaultEval defEval(*this, CE); 267294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForEvalCall(dstCallEvaluated, 268294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek dstPreVisit, 269294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek CE, *this, &defEval); 270294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 271294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Finally, perform the post-condition check of the CallExpr and store 272294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // the created nodes in 'Dst'. 273294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPostStmt(dst, dstCallEvaluated, CE, 274294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek *this); 275294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 276294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 277294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitReturnStmt(const ReturnStmt *RS, ExplodedNode *Pred, 278294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 279294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet Src; 280ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks { 281aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder Bldr(Pred, Src, *currentBuilderContext); 282ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks if (const Expr *RetE = RS->getRetValue()) { 283ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks // Record the returned expression in the state. It will be used in 284ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks // processCallExit to bind the return value to the call expr. 285ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks { 286ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks static SimpleProgramPointTag tag("ExprEngine: ReturnStmt"); 287ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks const ProgramState *state = Pred->getState(); 288ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks state = state->set<ReturnExpr>(RetE); 289ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Pred = Bldr.generateNode(RetE, Pred, state, false, &tag); 290ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks } 291ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks // We may get a NULL Pred because we generated a cached node. 292ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks if (Pred) { 293ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.takeNodes(Pred); 294ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks ExplodedNodeSet Tmp; 295ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Visit(RetE, Pred, Tmp); 296ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.addNodes(Tmp); 297ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks } 298294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 299294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 300294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 301fe27971d54d26997149d6b84057f04ff398d1d5dJordy Rose getCheckerManager().runCheckersForPreStmt(Dst, Src, RS, *this); 302294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 303