ExprEngineC.cpp revision 13dd47a0c01f8b4a6b3fbe379218f7ba8e692d0f
1294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek//=-- ExprEngineC.cpp - ExprEngine support for C expressions ----*- 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 C expressions. 11294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// 12294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek//===----------------------------------------------------------------------===// 13294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 14294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/StaticAnalyzer/Core/CheckerManager.h" 15294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 16294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 17294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing namespace clang; 18294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing namespace ento; 19294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing llvm::APSInt; 20294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 21294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitBinaryOperator(const BinaryOperator* B, 22294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 23294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 24d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 25294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Expr *LHS = B->getLHS()->IgnoreParens(); 26294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Expr *RHS = B->getRHS()->IgnoreParens(); 27294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 28d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // FIXME: Prechecks eventually go in ::Visit(). 29d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek ExplodedNodeSet CheckedSet; 30d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek ExplodedNodeSet Tmp2; 31d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek getCheckerManager().runCheckersForPreStmt(CheckedSet, Pred, B, *this); 32294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 33d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // With both the LHS and RHS evaluated, process the operation itself. 34d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek for (ExplodedNodeSet::iterator it=CheckedSet.begin(), ei=CheckedSet.end(); 35d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek it != ei; ++it) { 36d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 378bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = (*it)->getState(); 385eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = (*it)->getLocationContext(); 395eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal LeftV = state->getSVal(LHS, LCtx); 405eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal RightV = state->getSVal(RHS, LCtx); 41d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 42d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek BinaryOperator::Opcode Op = B->getOpcode(); 43d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 44d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek if (Op == BO_Assign) { 45d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // EXPERIMENTAL: "Conjured" symbols. 46d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // FIXME: Handle structs. 473cdf584e068056540769dab56cad333e95a89750Anna Zaks if (RightV.isUnknown()) { 48ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks unsigned Count = currentBuilderContext->getCurrentBlockCount(); 493133f79cf451e6302dd05262b4bb53a3e4fd6300Ted Kremenek RightV = svalBuilder.getConjuredSymbolVal(NULL, B->getRHS(), LCtx, Count); 50294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 51d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Simulate the effects of a "store": bind the value of the RHS 52d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // to the L-Value represented by the LHS. 53591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks SVal ExprVal = B->isGLValue() ? LeftV : RightV; 545eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek evalStore(Tmp2, B, LHS, *it, state->BindExpr(B, LCtx, ExprVal), 555eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek LeftV, RightV); 56d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek continue; 57d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 58294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 59d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek if (!B->isAssignmentOp()) { 60aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder Bldr(*it, Tmp2, *currentBuilderContext); 61e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks 62e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks if (B->isAdditiveOp()) { 63e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // If one of the operands is a location, conjure a symbol for the other 64e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // one (offset) if it's unknown so that memory arithmetic always 65e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // results in an ElementRegion. 66e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // TODO: This can be removed after we enable history tracking with 67e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // SymSymExpr. 68e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks unsigned Count = currentBuilderContext->getCurrentBlockCount(); 69e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks if (isa<Loc>(LeftV) && 70e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks RHS->getType()->isIntegerType() && RightV.isUnknown()) { 71e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks RightV = svalBuilder.getConjuredSymbolVal(RHS, LCtx, 72e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks RHS->getType(), Count); 73e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks } 74e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks if (isa<Loc>(RightV) && 75e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks LHS->getType()->isIntegerType() && LeftV.isUnknown()) { 76e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks LeftV = svalBuilder.getConjuredSymbolVal(LHS, LCtx, 77e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks LHS->getType(), Count); 78e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks } 79e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks } 80e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks 81d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Process non-assignments except commas or short-circuited 82d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // logical expressions (LAnd and LOr). 83d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal Result = evalBinOp(state, Op, LeftV, RightV, B->getType()); 84d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek if (Result.isUnknown()) { 85ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(B, *it, state); 86294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 87d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 88d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 895eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, Result); 90ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(B, *it, state); 91d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek continue; 92d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 93294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 94d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek assert (B->isCompoundAssignmentOp()); 95d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 96d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek switch (Op) { 97d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek default: 98b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid opcode for compound assignment."); 99d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_MulAssign: Op = BO_Mul; break; 100d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_DivAssign: Op = BO_Div; break; 101d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_RemAssign: Op = BO_Rem; break; 102d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_AddAssign: Op = BO_Add; break; 103d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_SubAssign: Op = BO_Sub; break; 104d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_ShlAssign: Op = BO_Shl; break; 105d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_ShrAssign: Op = BO_Shr; break; 106d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_AndAssign: Op = BO_And; break; 107d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_XorAssign: Op = BO_Xor; break; 108d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_OrAssign: Op = BO_Or; break; 109d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 110294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 111d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Perform a load (the LHS). This performs the checks for 112d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // null dereferences, and so on. 113d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek ExplodedNodeSet Tmp; 114d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal location = LeftV; 115bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Tmp, B, LHS, *it, state, location); 116d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 117d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek for (ExplodedNodeSet::iterator I = Tmp.begin(), E = Tmp.end(); I != E; 118d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek ++I) { 119d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 120d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek state = (*I)->getState(); 1215eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = (*I)->getLocationContext(); 1225eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal V = state->getSVal(LHS, LCtx); 123294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 124d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Get the computation type. 125d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek QualType CTy = 126294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek cast<CompoundAssignOperator>(B)->getComputationResultType(); 127d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek CTy = getContext().getCanonicalType(CTy); 128d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 129d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek QualType CLHSTy = 130294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek cast<CompoundAssignOperator>(B)->getComputationLHSType(); 131d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek CLHSTy = getContext().getCanonicalType(CLHSTy); 132d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 133d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek QualType LTy = getContext().getCanonicalType(LHS->getType()); 134d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 135d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Promote LHS. 136d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek V = svalBuilder.evalCast(V, CLHSTy, LTy); 137d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 138d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Compute the result of the operation. 139d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal Result = svalBuilder.evalCast(evalBinOp(state, Op, V, RightV, CTy), 140d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek B->getType(), CTy); 141d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 142d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // EXPERIMENTAL: "Conjured" symbols. 143d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // FIXME: Handle structs. 144d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 145d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal LHSVal; 146d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 14776462f00854171d2aa3ebc34f9aac1c60021b0eaAnna Zaks if (Result.isUnknown()) { 148294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 149ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks unsigned Count = currentBuilderContext->getCurrentBlockCount(); 150294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 151d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // The symbolic value is actually for the type of the left-hand side 152d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // expression, not the computation type, as this is the value the 153d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // LValue on the LHS will bind to. 1543133f79cf451e6302dd05262b4bb53a3e4fd6300Ted Kremenek LHSVal = svalBuilder.getConjuredSymbolVal(NULL, B->getRHS(), LCtx, 1553133f79cf451e6302dd05262b4bb53a3e4fd6300Ted Kremenek LTy, Count); 156294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 157d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // However, we need to convert the symbol to the computation type. 158d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek Result = svalBuilder.evalCast(LHSVal, CTy, LTy); 159d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 160d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek else { 161d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // The left-hand side may bind to a different value then the 162d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // computation type. 163d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek LHSVal = svalBuilder.evalCast(Result, LTy, CTy); 164294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 165d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 166d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // In C++, assignment and compound assignment operators return an 167d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // lvalue. 168591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (B->isGLValue()) 1695eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, location); 170d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek else 1715eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, Result); 172d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 173d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek evalStore(Tmp2, B, LHS, *I, state, location, LHSVal); 174294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 175294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 176294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 177d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // FIXME: postvisits eventually go in ::Visit() 178d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek getCheckerManager().runCheckersForPostStmt(Dst, Tmp2, B, *this); 179294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 180294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 181294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitBlockExpr(const BlockExpr *BE, ExplodedNode *Pred, 182294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 183294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 184294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek CanQualType T = getContext().getCanonicalType(BE->getType()); 18585d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 18685d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // Get the value of the block itself. 187294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal V = svalBuilder.getBlockPointer(BE->getBlockDecl(), T, 188294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Pred->getLocationContext()); 189294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 19085d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek ProgramStateRef State = Pred->getState(); 19185d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 19285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // If we created a new MemRegion for the block, we should explicitly bind 19385d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // the captured variables. 19485d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek if (const BlockDataRegion *BDR = 19585d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek dyn_cast_or_null<BlockDataRegion>(V.getAsRegion())) { 19685d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 19785d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek BlockDataRegion::referenced_vars_iterator I = BDR->referenced_vars_begin(), 19885d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek E = BDR->referenced_vars_end(); 19985d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 20085d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek for (; I != E; ++I) { 20185d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek const MemRegion *capturedR = I.getCapturedRegion(); 20285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek const MemRegion *originalR = I.getOriginalRegion(); 20385d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek if (capturedR != originalR) { 20485d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek SVal originalV = State->getSVal(loc::MemRegionVal(originalR)); 20585d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek State = State->bindLoc(loc::MemRegionVal(capturedR), originalV); 20685d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 20785d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 20885d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 20985d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 210294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet Tmp; 211aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder Bldr(Pred, Tmp, *currentBuilderContext); 2125eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek Bldr.generateNode(BE, Pred, 21385d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek State->BindExpr(BE, Pred->getLocationContext(), V), 2145eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek false, 0, 215ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks ProgramPoint::PostLValueKind); 216294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 217294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: Move all post/pre visits to ::Visit(). 218294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPostStmt(Dst, Tmp, BE, *this); 219294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 220294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 221294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCast(const CastExpr *CastE, const Expr *Ex, 222294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, ExplodedNodeSet &Dst) { 223294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 224294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreStmt; 225294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreStmt, Pred, CastE, *this); 226294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 2277864435ef2bce200224120bd1df3aed98ea5b99aJohn McCall if (CastE->getCastKind() == CK_LValueToRValue) { 228294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end(); 229294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I!=E; ++I) { 230294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *subExprNode = *I; 2318bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = subExprNode->getState(); 2325eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = subExprNode->getLocationContext(); 233bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Dst, CastE, CastE, subExprNode, state, state->getSVal(Ex, LCtx)); 234294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 235294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 236294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 237294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 238294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // All other casts. 239294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = CastE->getType(); 240294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType ExTy = Ex->getType(); 241294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 242294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (const ExplicitCastExpr *ExCast=dyn_cast_or_null<ExplicitCastExpr>(CastE)) 243294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek T = ExCast->getTypeAsWritten(); 244294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 245aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder Bldr(dstPreStmt, Dst, *currentBuilderContext); 246294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end(); 247294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I != E; ++I) { 248294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 249294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Pred = *I; 250294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 251294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek switch (CastE->getCastKind()) { 252294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_LValueToRValue: 253b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("LValueToRValue casts handled earlier."); 254294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ToVoid: 255294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 256294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // The analyzer doesn't do anything special with these casts, 257294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // since it understands retain/release semantics already. 25833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 25933e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 26033e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 26133e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: // Fall-through. 262ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 2637a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // The analyser can ignore atomic casts for now, although some future 2647a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // checkers may want to make certain that you're not modifying the same 2657a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // value through atomic and nonatomic pointers. 2667a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 2677a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 268294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // True no-ops. 269294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_NoOp: 270294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FunctionToPointerDecay: { 271294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Copy the SVal of Ex to CastE. 2728bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 2735eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 2745eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal V = state->getSVal(Ex, LCtx); 2755eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CastE, LCtx, V); 276ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 277294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 278294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 279294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_Dependent: 280294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ArrayToPointerDecay: 281294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BitCast: 282294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_LValueBitCast: 283294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralCast: 284294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_NullToPointer: 285294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToPointer: 286294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_PointerToIntegral: 287294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_PointerToBoolean: 288294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToBoolean: 289294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToFloating: 290294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingToIntegral: 291294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingToBoolean: 292294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingCast: 293294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingRealToComplex: 294294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToReal: 295294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToBoolean: 296294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexCast: 297294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToIntegralComplex: 298294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralRealToComplex: 299294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToReal: 300294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToBoolean: 301294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexCast: 302294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToFloatingComplex: 3031d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 3041d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 305294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_AnyPointerToBlockPointerCast: 306294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ObjCObjectLValueCast: { 307294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Delegate to SValBuilder to process. 3088bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 3095eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 3105eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal V = state->getSVal(Ex, LCtx); 311294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek V = svalBuilder.evalCast(V, T, ExTy); 3125eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CastE, LCtx, V); 313ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 314294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 315294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 316294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_DerivedToBase: 317294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_UncheckedDerivedToBase: { 318294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // For DerivedToBase cast, delegate to the store manager. 3198bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 3205eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 3215eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal val = state->getSVal(Ex, LCtx); 322294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek val = getStoreManager().evalDerivedToBase(val, T); 3235eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CastE, LCtx, val); 324ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 325294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 326294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 327e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Handle C++ dyn_cast. 328e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks case CK_Dynamic: { 329e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks ProgramStateRef state = Pred->getState(); 330e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks const LocationContext *LCtx = Pred->getLocationContext(); 331e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks SVal val = state->getSVal(Ex, LCtx); 332e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 333e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Compute the type of the result. 334e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks QualType resultType = CastE->getType(); 335591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (CastE->isGLValue()) 336e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks resultType = getContext().getPointerType(resultType); 337e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 338e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks bool Failed = false; 339e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 340e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Check if the value being cast evaluates to 0. 341e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (val.isZeroConstant()) 342e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks Failed = true; 343e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Else, evaluate the cast. 344e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks else 345e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks val = getStoreManager().evalDynamicCast(val, T, Failed); 346e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 347e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (Failed) { 348a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks if (T->isReferenceType()) { 349a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks // A bad_cast exception is thrown if input value is a reference. 350a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks // Currently, we model this, by generating a sink. 351a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks Bldr.generateNode(CastE, Pred, state, true); 352a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks continue; 353a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks } else { 3547ea1c5639764aa3ebe124f4350c5f2b3be795667Anna Zaks // If the cast fails on a pointer, bind to 0. 3557ea1c5639764aa3ebe124f4350c5f2b3be795667Anna Zaks state = state->BindExpr(CastE, LCtx, svalBuilder.makeNull()); 356a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks } 357e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } else { 358e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // If we don't know if the cast succeeded, conjure a new symbol. 359e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (val.isUnknown()) { 360e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks DefinedOrUnknownSVal NewSym = svalBuilder.getConjuredSymbolVal(NULL, 361e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks CastE, LCtx, resultType, 362e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks currentBuilderContext->getCurrentBlockCount()); 363e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks state = state->BindExpr(CastE, LCtx, NewSym); 364e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } else 365e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Else, bind to the derived region value. 366e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks state = state->BindExpr(CastE, LCtx, val); 367e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } 368e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks Bldr.generateNode(CastE, Pred, state); 369e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks continue; 370e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } 371e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Various C++ casts that are not handled yet. 372294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ToUnion: 373294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BaseToDerived: 374294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_NullToMemberPointer: 375294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BaseToDerivedMemberPointer: 376294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_DerivedToBaseMemberPointer: 3774d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 378294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_UserDefinedConversion: 379294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ConstructorConversion: 380294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_VectorSplat: 381294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_MemberPointerToBoolean: { 382294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Recover some path-sensitivty by conjuring a new value. 383294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType resultType = CastE->getType(); 384591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (CastE->isGLValue()) 385294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek resultType = getContext().getPointerType(resultType); 3863133f79cf451e6302dd05262b4bb53a3e4fd6300Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 387e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks SVal result = svalBuilder.getConjuredSymbolVal(NULL, CastE, LCtx, 388e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks resultType, currentBuilderContext->getCurrentBlockCount()); 3898bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState()->BindExpr(CastE, LCtx, 3905eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek result); 391ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 392294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 393294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 394294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 395294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 396294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 397294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 398294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCompoundLiteralExpr(const CompoundLiteralExpr *CL, 399294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 400294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 401aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder B(Pred, Dst, *currentBuilderContext); 402d231d0130a95336610ab9a42eaeb2cdac19992f3Anna Zaks 403294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const InitListExpr *ILE 404294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek = cast<InitListExpr>(CL->getInitializer()->IgnoreParens()); 405294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 4068bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 4075eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal ILV = state->getSVal(ILE, Pred->getLocationContext()); 408294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const LocationContext *LC = Pred->getLocationContext(); 409294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek state = state->bindCompoundLiteral(CL, LC, ILV); 410294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 411591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (CL->isGLValue()) 4125eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(CL, Pred, state->BindExpr(CL, LC, state->getLValue(CL, LC))); 413294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else 4145eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(CL, Pred, state->BindExpr(CL, LC, ILV)); 415294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 416294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 417294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitDeclStmt(const DeclStmt *DS, ExplodedNode *Pred, 418294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 419294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 420294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: static variables may have an initializer, but the second 421294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // time a function is called those values may not be current. 422294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // This may need to be reflected in the CFG. 423294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 424294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Assumption: The CFG has one DeclStmt per Decl. 425294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Decl *D = *DS->decl_begin(); 426294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 427ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks if (!D || !isa<VarDecl>(D)) { 428ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks //TODO:AZ: remove explicit insertion after refactoring is done. 429ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Dst.insert(Pred); 430294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 431ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks } 432294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 433294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: all pre/post visits should eventually be handled by ::Visit(). 434294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreVisit; 435294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, DS, *this); 436294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 437aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder B(dstPreVisit, Dst, *currentBuilderContext); 438294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const VarDecl *VD = dyn_cast<VarDecl>(D); 439294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreVisit.begin(), E = dstPreVisit.end(); 440294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I!=E; ++I) { 441294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *N = *I; 4428bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = N->getState(); 443294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 444294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Decls without InitExpr are not initialized explicitly. 445294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const LocationContext *LC = N->getLocationContext(); 446294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 447294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (const Expr *InitEx = VD->getInit()) { 4485eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal InitVal = state->getSVal(InitEx, Pred->getLocationContext()); 449294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 450294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // We bound the temp obj region to the CXXConstructExpr. Now recover 451294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // the lazy compound value when the variable is not a reference. 4524e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (AMgr.getLangOpts().CPlusPlus && VD->getType()->isRecordType() && 453294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek !VD->getType()->isReferenceType() && isa<loc::MemRegionVal>(InitVal)){ 454294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek InitVal = state->getSVal(cast<loc::MemRegionVal>(InitVal).getRegion()); 455294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(isa<nonloc::LazyCompoundVal>(InitVal)); 456294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 457294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 458294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Recover some path-sensitivity if a scalar value evaluated to 459294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // UnknownVal. 460084842d334fca296279262c2534f6aa31b1dfdbbAnna Zaks if (InitVal.isUnknown()) { 461b98b998e9a5637012ab39ad1dabdad7c798721e8Ted Kremenek QualType Ty = InitEx->getType(); 462591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (InitEx->isGLValue()) { 463b98b998e9a5637012ab39ad1dabdad7c798721e8Ted Kremenek Ty = getContext().getPointerType(Ty); 464b98b998e9a5637012ab39ad1dabdad7c798721e8Ted Kremenek } 465b98b998e9a5637012ab39ad1dabdad7c798721e8Ted Kremenek 466b98b998e9a5637012ab39ad1dabdad7c798721e8Ted Kremenek InitVal = svalBuilder.getConjuredSymbolVal(NULL, InitEx, LC, Ty, 467ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks currentBuilderContext->getCurrentBlockCount()); 468294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 469d231d0130a95336610ab9a42eaeb2cdac19992f3Anna Zaks B.takeNodes(N); 4706889679d72859960e0fc8d1080487f63c4df1e0aAnna Zaks ExplodedNodeSet Dst2; 4716889679d72859960e0fc8d1080487f63c4df1e0aAnna Zaks evalBind(Dst2, DS, N, state->getLValue(VD, LC), InitVal, true); 4726889679d72859960e0fc8d1080487f63c4df1e0aAnna Zaks B.addNodes(Dst2); 473294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 474294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else { 475d231d0130a95336610ab9a42eaeb2cdac19992f3Anna Zaks B.generateNode(DS, N,state->bindDeclWithNoInit(state->getRegion(VD, LC))); 476294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 477294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 478294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 479294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 480294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitLogicalExpr(const BinaryOperator* B, ExplodedNode *Pred, 481294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 482294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(B->getOpcode() == BO_LAnd || 483294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek B->getOpcode() == BO_LOr); 484ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks 485aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); 4868bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 4875eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 4885eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal X = state->getSVal(B, LCtx); 489294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(X.isUndef()); 490294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 491294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = (const Expr*) cast<UndefinedVal>(X).getData(); 492294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(Ex); 493294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 494294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (Ex == B->getRHS()) { 4955eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek X = state->getSVal(Ex, LCtx); 496294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 497294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Handle undefined values. 498294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (X.isUndef()) { 4995eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek Bldr.generateNode(B, Pred, state->BindExpr(B, LCtx, X)); 500294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 501294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 502294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 503294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek DefinedOrUnknownSVal XD = cast<DefinedOrUnknownSVal>(X); 504294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 505294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // We took the RHS. Because the value of the '&&' or '||' expression must 506294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // evaluate to 0 or 1, we must assume the value of the RHS evaluates to 0 507294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // or 1. Alternatively, we could take a lazy approach, and calculate this 508294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // value later when necessary. We don't have the machinery in place for 509294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // this right now, and since most logical expressions are used for branches, 510294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // the payoff is not likely to be large. Instead, we do eager evaluation. 5118bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek if (ProgramStateRef newState = state->assume(XD, true)) 5126b6152ba96c164a292cc0b8d8b1d4cecbec27a60Anna Zaks Bldr.generateNode(B, Pred, 5135eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek newState->BindExpr(B, LCtx, 5145eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek svalBuilder.makeIntVal(1U, B->getType()))); 515294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 5168bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek if (ProgramStateRef newState = state->assume(XD, false)) 5176b6152ba96c164a292cc0b8d8b1d4cecbec27a60Anna Zaks Bldr.generateNode(B, Pred, 5185eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek newState->BindExpr(B, LCtx, 5195eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek svalBuilder.makeIntVal(0U, B->getType()))); 520294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 521294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else { 522294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // We took the LHS expression. Depending on whether we are '&&' or 523294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // '||' we know what the value of the expression is via properties of 524294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // the short-circuiting. 525294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek X = svalBuilder.makeIntVal(B->getOpcode() == BO_LAnd ? 0U : 1U, 526294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek B->getType()); 5275eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek Bldr.generateNode(B, Pred, state->BindExpr(B, LCtx, X)); 528294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 529294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 530294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 531294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitInitListExpr(const InitListExpr *IE, 532294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 533294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 534aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder B(Pred, Dst, *currentBuilderContext); 535294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 5368bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 5375eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 538294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = getContext().getCanonicalType(IE->getType()); 539294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek unsigned NumInitElements = IE->getNumInits(); 540294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 541294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (T->isArrayType() || T->isRecordType() || T->isVectorType()) { 542294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek llvm::ImmutableList<SVal> vals = getBasicVals().getEmptySValList(); 543294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 544294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Handle base case where the initializer has no elements. 545294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // e.g: static int* myArray[] = {}; 546294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (NumInitElements == 0) { 547294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal V = svalBuilder.makeCompoundVal(T, vals); 5485eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, V)); 549294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 550294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 551294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 552294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (InitListExpr::const_reverse_iterator it = IE->rbegin(), 553294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ei = IE->rend(); it != ei; ++it) { 5545eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek vals = getBasicVals().consVals(state->getSVal(cast<Expr>(*it), LCtx), 5555eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek vals); 556294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 557294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 5586b6152ba96c164a292cc0b8d8b1d4cecbec27a60Anna Zaks B.generateNode(IE, Pred, 5595eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state->BindExpr(IE, LCtx, 5605eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek svalBuilder.makeCompoundVal(T, vals))); 561294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 562294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 563294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 564294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (Loc::isLocType(T) || T->isIntegerType()) { 565294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(IE->getNumInits() == 1); 566294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *initEx = IE->getInit(0); 5675eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, 5685eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state->getSVal(initEx, LCtx))); 569294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 570294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 57113dd47a0c01f8b4a6b3fbe379218f7ba8e692d0fAnna Zaks 57213dd47a0c01f8b4a6b3fbe379218f7ba8e692d0fAnna Zaks assert(IE->getNumInits() == 1); 57313dd47a0c01f8b4a6b3fbe379218f7ba8e692d0fAnna Zaks B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, UnknownVal())); 57413dd47a0c01f8b4a6b3fbe379218f7ba8e692d0fAnna Zaks return; 575294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 576294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 577294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitGuardedExpr(const Expr *Ex, 578294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *L, 579294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *R, 580294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 581294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 582aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder B(Pred, Dst, *currentBuilderContext); 583294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 5848bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 5855eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 5865eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal X = state->getSVal(Ex, LCtx); 587294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert (X.isUndef()); 588294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *SE = (Expr*) cast<UndefinedVal>(X).getData(); 589294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(SE); 5905eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek X = state->getSVal(SE, LCtx); 591294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 592294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Make sure that we invalidate the previous binding. 5935eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(Ex, Pred, state->BindExpr(Ex, LCtx, X, true)); 594294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 595294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 596294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine:: 597294fd0a62b95f512637910bf85c7efa6c2354b50Ted KremenekVisitOffsetOfExpr(const OffsetOfExpr *OOE, 598294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, ExplodedNodeSet &Dst) { 599aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder B(Pred, Dst, *currentBuilderContext); 60080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APSInt IV; 60180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (OOE->EvaluateAsInt(IV, getContext())) { 602294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(IV.getBitWidth() == getContext().getTypeSize(OOE->getType())); 603294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(OOE->getType()->isIntegerType()); 604294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(IV.isSigned() == OOE->getType()->isSignedIntegerOrEnumerationType()); 605294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal X = svalBuilder.makeIntVal(IV); 6065eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(OOE, Pred, 6075eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek Pred->getState()->BindExpr(OOE, Pred->getLocationContext(), 6085eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek X)); 609294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 610294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: Handle the case where __builtin_offsetof is not a constant. 611294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 612294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 613294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 614294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine:: 615294fd0a62b95f512637910bf85c7efa6c2354b50Ted KremenekVisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *Ex, 616294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 617294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 618aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); 619294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 620294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = Ex->getTypeOfArgument(); 621294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 622294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (Ex->getKind() == UETT_SizeOf) { 623294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (!T->isIncompleteType() && !T->isConstantSizeType()) { 624294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(T->isVariableArrayType() && "Unknown non-constant-sized type."); 625294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 626540dda6f2e4982b3eab0300c804345f5b6104c11Ted Kremenek // FIXME: Add support for VLA type arguments and VLA expressions. 627294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // When that happens, we should probably refactor VLASizeChecker's code. 628294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 629294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 630294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else if (T->getAs<ObjCObjectType>()) { 631294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Some code tries to take the sizeof an ObjCObjectType, relying that 632294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // the compiler has laid out its representation. Just report Unknown 633294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // for these. 634294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 635294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 636294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 637294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 63880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APSInt Value = Ex->EvaluateKnownConstInt(getContext()); 63980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith CharUnits amt = CharUnits::fromQuantity(Value.getZExtValue()); 640294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 6418bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 6425eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(Ex, Pred->getLocationContext(), 6435eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek svalBuilder.makeIntVal(amt.getQuantity(), 644294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Ex->getType())); 645ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(Ex, Pred, state); 646294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 647294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 648294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitUnaryOperator(const UnaryOperator* U, 649294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 6508ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNodeSet &Dst) { 651aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder Bldr(Pred, Dst, *currentBuilderContext); 652294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek switch (U->getOpcode()) { 653ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks default: { 654ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.takeNodes(Pred); 655ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks ExplodedNodeSet Tmp; 656ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks VisitIncrementDecrementOperator(U, Pred, Tmp); 657ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.addNodes(Tmp); 658ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks } 659294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek break; 660294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Real: { 661294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 662294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 663019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // FIXME: We don't have complex SValues yet. 664019316636b0a2d2273b945a98e52d454acee66efTed Kremenek if (Ex->getType()->isAnyComplexType()) { 665019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // Just report "Unknown." 666019316636b0a2d2273b945a98e52d454acee66efTed Kremenek break; 667019316636b0a2d2273b945a98e52d454acee66efTed Kremenek } 668294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 669019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // For all other types, UO_Real is an identity operation. 670019316636b0a2d2273b945a98e52d454acee66efTed Kremenek assert (U->getType() == Ex->getType()); 671019316636b0a2d2273b945a98e52d454acee66efTed Kremenek ProgramStateRef state = Pred->getState(); 672019316636b0a2d2273b945a98e52d454acee66efTed Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 673019316636b0a2d2273b945a98e52d454acee66efTed Kremenek Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, 6745eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state->getSVal(Ex, LCtx))); 6758ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 676294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 677294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 678c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek case UO_Imag: { 679294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 680c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // FIXME: We don't have complex SValues yet. 681c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek if (Ex->getType()->isAnyComplexType()) { 682c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // Just report "Unknown." 683c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek break; 684294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 685c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // For all other types, UO_Imag returns 0. 686c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek ProgramStateRef state = Pred->getState(); 687c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 688c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek SVal X = svalBuilder.makeZeroVal(Ex->getType()); 689c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, X)); 6908ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 691294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 692294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 693294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Plus: 694591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks assert(!U->isGLValue()); 695294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FALL-THROUGH. 696294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Deref: 697294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_AddrOf: 698294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Extension: { 699224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // FIXME: We can probably just have some magic in Environment::getSVal() 700224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // that propagates values, instead of creating a new node here. 701224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // 702294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Unary "+" is a no-op, similar to a parentheses. We still have places 703294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // where it may be a block-level expression, so we need to 704294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // generate an extra node that just propagates the value of the 705224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // subexpression. 706294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 707224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek ProgramStateRef state = Pred->getState(); 708224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 709224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, 7105eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state->getSVal(Ex, LCtx))); 7118ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 712294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 713294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 714294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_LNot: 715294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Minus: 716294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Not: { 717591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks assert (!U->isGLValue()); 718294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 719a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek ProgramStateRef state = Pred->getState(); 720a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 721294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 722a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // Get the value of the subexpression. 723a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek SVal V = state->getSVal(Ex, LCtx); 724294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 725a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek if (V.isUnknownOrUndef()) { 726a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, V)); 727a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 728a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 729294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 730a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek switch (U->getOpcode()) { 731a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek default: 732a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek llvm_unreachable("Invalid Opcode."); 733a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_Not: 734a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // FIXME: Do we need to handle promotions? 735a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek state = state->BindExpr(U, LCtx, evalComplement(cast<NonLoc>(V))); 736a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 737a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_Minus: 738a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // FIXME: Do we need to handle promotions? 739a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek state = state->BindExpr(U, LCtx, evalMinus(cast<NonLoc>(V))); 740a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 741a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_LNot: 742a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // C99 6.5.3.3: "The expression !E is equivalent to (0==E)." 743a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // 744a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // Note: technically we do "E == 0", but this is the same in the 745a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // transfer functions as "0 == E". 746a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek SVal Result; 747a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek if (isa<Loc>(V)) { 748a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Loc X = svalBuilder.makeNull(); 749a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Result = evalBinOp(state, BO_EQ, cast<Loc>(V), X, 750a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek U->getType()); 751a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 752a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek else { 753a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek nonloc::ConcreteInt X(getBasicVals().getValue(0, Ex->getType())); 754a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Result = evalBinOp(state, BO_EQ, cast<NonLoc>(V), X, 755a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek U->getType()); 756a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 757a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek 758a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek state = state->BindExpr(U, LCtx, Result); 759a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 760294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 761a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Bldr.generateNode(U, Pred, state); 7628ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 763294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 764294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 7658ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks 7668ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks} 7678ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks 7688ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaksvoid ExprEngine::VisitIncrementDecrementOperator(const UnaryOperator* U, 7698ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNode *Pred, 7708ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNodeSet &Dst) { 771294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Handle ++ and -- (both pre- and post-increment). 772294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert (U->isIncrementDecrementOp()); 773294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 774294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 7759050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 7769050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ProgramStateRef state = Pred->getState(); 7779050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal loc = state->getSVal(Ex, LCtx); 7789050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 7799050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Perform a load. 7809050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Tmp; 781bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Tmp, U, Ex, Pred, state, loc); 7829050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 7839050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Dst2; 7849050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek StmtNodeBuilder Bldr(Tmp, Dst2, *currentBuilderContext); 7859050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek for (ExplodedNodeSet::iterator I=Tmp.begin(), E=Tmp.end();I!=E;++I) { 786294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 7879050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = (*I)->getState(); 7889050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek assert(LCtx == (*I)->getLocationContext()); 7899050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal V2_untested = state->getSVal(Ex, LCtx); 790294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 7919050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Propagate unknown and undefined values. 7929050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (V2_untested.isUnknownOrUndef()) { 7939050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, V2_untested)); 7949050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek continue; 7959050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek } 7969050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek DefinedSVal V2 = cast<DefinedSVal>(V2_untested); 7979050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 7989050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Handle all other values. 7999050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek BinaryOperator::Opcode Op = U->isIncrementOp() ? BO_Add : BO_Sub; 8009050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8019050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // If the UnaryOperator has non-location type, use its type to create the 8029050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // constant value. If the UnaryOperator has location type, create the 8039050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // constant with int type and pointer width. 8049050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal RHS; 8059050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8069050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (U->getType()->isAnyPointerType()) 8079050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek RHS = svalBuilder.makeArrayIndex(1); 8089050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek else 8099050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek RHS = svalBuilder.makeIntVal(1, U->getType()); 8109050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8119050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal Result = evalBinOp(state, Op, V2, RHS, U->getType()); 8129050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8139050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Conjure a new symbol if necessary to recover precision. 8149050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (Result.isUnknown()){ 8159050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek DefinedOrUnknownSVal SymVal = 8163133f79cf451e6302dd05262b4bb53a3e4fd6300Ted Kremenek svalBuilder.getConjuredSymbolVal(NULL, Ex, LCtx, 8179050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek currentBuilderContext->getCurrentBlockCount()); 8189050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Result = SymVal; 819294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8209050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // If the value is a location, ++/-- should always preserve 8219050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // non-nullness. Check if the original value was non-null, and if so 8229050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // propagate that constraint. 8239050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (Loc::isLocType(U->getType())) { 8249050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek DefinedOrUnknownSVal Constraint = 8259050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek svalBuilder.evalEQ(state, V2,svalBuilder.makeZeroVal(U->getType())); 826294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8279050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (!state->assume(Constraint, true)) { 8289050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // It isn't feasible for the original value to be null. 8299050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Propagate this constraint. 8309050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Constraint = svalBuilder.evalEQ(state, SymVal, 8319050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek svalBuilder.makeZeroVal(U->getType())); 832294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8339050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8349050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->assume(Constraint, false); 8359050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek assert(state); 836294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 837294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 838294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 8399050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8409050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Since the lvalue-to-rvalue conversion is explicit in the AST, 8419050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // we bind an l-value if the operator is prefix and an lvalue (in C++). 842591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (U->isGLValue()) 8439050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->BindExpr(U, LCtx, loc); 8449050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek else 8459050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->BindExpr(U, LCtx, U->isPostfix() ? V2 : Result); 8469050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8479050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Perform the store. 8489050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.takeNodes(*I); 8499050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Dst3; 850bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalStore(Dst3, U, U, *I, state, loc, Result); 8519050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.addNodes(Dst3); 852294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 8539050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Dst.insert(Dst2); 854294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 855