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()) { 4866c486f275531df6362b3511fc3af6563561801bTed Kremenek unsigned Count = currBldrCtx->blockCount(); 493b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek RightV = svalBuilder.conjureSymbolVal(0, 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()) { 6066c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(*it, Tmp2, *currBldrCtx); 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. 6866c486f275531df6362b3511fc3af6563561801bTed Kremenek unsigned Count = currBldrCtx->blockCount(); 69e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks if (isa<Loc>(LeftV) && 70e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks RHS->getType()->isIntegerType() && RightV.isUnknown()) { 713b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek RightV = svalBuilder.conjureSymbolVal(RHS, LCtx, RHS->getType(), 723b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek Count); 73e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks } 74e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks if (isa<Loc>(RightV) && 75e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks LHS->getType()->isIntegerType() && LeftV.isUnknown()) { 763b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek LeftV = svalBuilder.conjureSymbolVal(LHS, LCtx, LHS->getType(), 773b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek 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()) { 148d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // The symbolic value is actually for the type of the left-hand side 149d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // expression, not the computation type, as this is the value the 150d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // LValue on the LHS will bind to. 15166c486f275531df6362b3511fc3af6563561801bTed Kremenek LHSVal = svalBuilder.conjureSymbolVal(0, B->getRHS(), LCtx, LTy, 15266c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 153d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // However, we need to convert the symbol to the computation type. 154d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek Result = svalBuilder.evalCast(LHSVal, CTy, LTy); 155d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 156d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek else { 157d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // The left-hand side may bind to a different value then the 158d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // computation type. 159d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek LHSVal = svalBuilder.evalCast(Result, LTy, CTy); 160294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 161d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 162d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // In C++, assignment and compound assignment operators return an 163d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // lvalue. 164591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (B->isGLValue()) 1655eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, location); 166d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek else 1675eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, Result); 168d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 169d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek evalStore(Tmp2, B, LHS, *I, state, location, LHSVal); 170294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 171294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 172294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 173d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // FIXME: postvisits eventually go in ::Visit() 174d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek getCheckerManager().runCheckersForPostStmt(Dst, Tmp2, B, *this); 175294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 176294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 177294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitBlockExpr(const BlockExpr *BE, ExplodedNode *Pred, 178294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 179294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 180294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek CanQualType T = getContext().getCanonicalType(BE->getType()); 18185d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 18285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // Get the value of the block itself. 183294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal V = svalBuilder.getBlockPointer(BE->getBlockDecl(), T, 184294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Pred->getLocationContext()); 185294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 18685d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek ProgramStateRef State = Pred->getState(); 18785d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 18885d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // If we created a new MemRegion for the block, we should explicitly bind 18985d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // the captured variables. 19085d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek if (const BlockDataRegion *BDR = 19185d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek dyn_cast_or_null<BlockDataRegion>(V.getAsRegion())) { 19285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 19385d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek BlockDataRegion::referenced_vars_iterator I = BDR->referenced_vars_begin(), 19485d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek E = BDR->referenced_vars_end(); 19585d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 19685d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek for (; I != E; ++I) { 19785d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek const MemRegion *capturedR = I.getCapturedRegion(); 19885d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek const MemRegion *originalR = I.getOriginalRegion(); 19985d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek if (capturedR != originalR) { 20085d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek SVal originalV = State->getSVal(loc::MemRegionVal(originalR)); 20185d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek State = State->bindLoc(loc::MemRegionVal(capturedR), originalV); 20285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 20385d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 20485d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 20585d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 206294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet Tmp; 20766c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Pred, Tmp, *currBldrCtx); 2085eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek Bldr.generateNode(BE, Pred, 20985d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek State->BindExpr(BE, Pred->getLocationContext(), V), 210fa06f0464a04bb7fce1fcfb3780d151bb029e00cJordan Rose 0, ProgramPoint::PostLValueKind); 211294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 212294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: Move all post/pre visits to ::Visit(). 213294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPostStmt(Dst, Tmp, BE, *this); 214294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 215294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 216294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCast(const CastExpr *CastE, const Expr *Ex, 217294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, ExplodedNodeSet &Dst) { 218294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 219294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreStmt; 220294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreStmt, Pred, CastE, *this); 221294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 2227864435ef2bce200224120bd1df3aed98ea5b99aJohn McCall if (CastE->getCastKind() == CK_LValueToRValue) { 223294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end(); 224294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I!=E; ++I) { 225294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *subExprNode = *I; 2268bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = subExprNode->getState(); 2275eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = subExprNode->getLocationContext(); 228bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Dst, CastE, CastE, subExprNode, state, state->getSVal(Ex, LCtx)); 229294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 230294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 231294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 232294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 233294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // All other casts. 234294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = CastE->getType(); 235294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType ExTy = Ex->getType(); 236294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 237294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (const ExplicitCastExpr *ExCast=dyn_cast_or_null<ExplicitCastExpr>(CastE)) 238294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek T = ExCast->getTypeAsWritten(); 239294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 24066c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(dstPreStmt, Dst, *currBldrCtx); 241294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end(); 242294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I != E; ++I) { 243294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 244294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Pred = *I; 245c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose ProgramStateRef state = Pred->getState(); 246c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose const LocationContext *LCtx = Pred->getLocationContext(); 247c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose 248294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek switch (CastE->getCastKind()) { 249294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_LValueToRValue: 250b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("LValueToRValue casts handled earlier."); 251294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ToVoid: 252294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 253294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // The analyzer doesn't do anything special with these casts, 254294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // since it understands retain/release semantics already. 25533e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 25633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 25733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 25833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: // Fall-through. 259ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 2607a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // The analyser can ignore atomic casts for now, although some future 2617a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // checkers may want to make certain that you're not modifying the same 2627a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // value through atomic and nonatomic pointers. 2637a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 2647a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 265294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // True no-ops. 266294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_NoOp: 267c210cb7a358d14cdd93b58562f33ff5ed2d895c1Jordan Rose case CK_ConstructorConversion: 268c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose case CK_UserDefinedConversion: 269a6c66cedc022c9e5d45a937d6b8cff491a6bf81bEli Friedman case CK_FunctionToPointerDecay: 270a6c66cedc022c9e5d45a937d6b8cff491a6bf81bEli Friedman case CK_BuiltinFnToFnPtr: { 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 } 2790156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose case CK_MemberPointerToBoolean: 2800156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose // FIXME: For now, member pointers are represented by void *. 2810156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose // FALLTHROUGH 282294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_Dependent: 283294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ArrayToPointerDecay: 284294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BitCast: 285294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralCast: 286294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_NullToPointer: 287294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToPointer: 288294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_PointerToIntegral: 289294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_PointerToBoolean: 290294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToBoolean: 291294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToFloating: 292294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingToIntegral: 293294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingToBoolean: 294294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingCast: 295294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingRealToComplex: 296294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToReal: 297294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToBoolean: 298294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexCast: 299294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToIntegralComplex: 300294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralRealToComplex: 301294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToReal: 302294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToBoolean: 303294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexCast: 304294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToFloatingComplex: 3051d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 3061d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 307294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_AnyPointerToBlockPointerCast: 308294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ObjCObjectLValueCast: { 309294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Delegate to SValBuilder to process. 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. 3195eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal val = state->getSVal(Ex, LCtx); 3202c5f8d79ed128892fa548a3308a938a3a53fbb5eJordan Rose val = getStoreManager().evalDerivedToBase(val, CastE); 3215eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CastE, LCtx, val); 322ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 323294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 324294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 325e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Handle C++ dyn_cast. 326e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks case CK_Dynamic: { 327e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks SVal val = state->getSVal(Ex, LCtx); 328e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 329e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Compute the type of the result. 330e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks QualType resultType = CastE->getType(); 331591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (CastE->isGLValue()) 332e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks resultType = getContext().getPointerType(resultType); 333e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 334e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks bool Failed = false; 335e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 336e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Check if the value being cast evaluates to 0. 337e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (val.isZeroConstant()) 338e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks Failed = true; 339e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Else, evaluate the cast. 340e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks else 341e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks val = getStoreManager().evalDynamicCast(val, T, Failed); 342e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 343e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (Failed) { 344a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks if (T->isReferenceType()) { 345a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks // A bad_cast exception is thrown if input value is a reference. 346a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks // Currently, we model this, by generating a sink. 347fa06f0464a04bb7fce1fcfb3780d151bb029e00cJordan Rose Bldr.generateSink(CastE, Pred, state); 348a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks continue; 349a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks } else { 3507ea1c5639764aa3ebe124f4350c5f2b3be795667Anna Zaks // If the cast fails on a pointer, bind to 0. 3517ea1c5639764aa3ebe124f4350c5f2b3be795667Anna Zaks state = state->BindExpr(CastE, LCtx, svalBuilder.makeNull()); 352a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks } 353e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } else { 354e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // If we don't know if the cast succeeded, conjure a new symbol. 355e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (val.isUnknown()) { 3563b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek DefinedOrUnknownSVal NewSym = 3573b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek svalBuilder.conjureSymbolVal(0, CastE, LCtx, resultType, 35866c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 359e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks state = state->BindExpr(CastE, LCtx, NewSym); 360e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } else 361e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Else, bind to the derived region value. 362e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks state = state->BindExpr(CastE, LCtx, val); 363e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } 364e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks Bldr.generateNode(CastE, Pred, state); 365e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks continue; 366e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } 3670156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose case CK_NullToMemberPointer: { 3680156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose // FIXME: For now, member pointers are represented by void *. 3690156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose SVal V = svalBuilder.makeIntValWithPtrWidth(0, true); 3700156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose state = state->BindExpr(CastE, LCtx, V); 3710156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose Bldr.generateNode(CastE, Pred, state); 3720156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose continue; 3730156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose } 374e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Various C++ casts that are not handled yet. 375294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ToUnion: 376294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BaseToDerived: 377294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BaseToDerivedMemberPointer: 378294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_DerivedToBaseMemberPointer: 3794d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 380294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_VectorSplat: 3815b8c69494881b7d35bc6244b4a19be0cc2eab368Jordan Rose case CK_LValueBitCast: { 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); 3863b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek SVal result = svalBuilder.conjureSymbolVal(0, CastE, LCtx, 38766c486f275531df6362b3511fc3af6563561801bTed Kremenek resultType, 38866c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 389c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose state = state->BindExpr(CastE, LCtx, result); 390ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 391294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 392294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 393294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 394294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 395294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 396294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 397294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCompoundLiteralExpr(const CompoundLiteralExpr *CL, 398294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 399294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 40066c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 401d231d0130a95336610ab9a42eaeb2cdac19992f3Anna Zaks 402294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const InitListExpr *ILE 403294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek = cast<InitListExpr>(CL->getInitializer()->IgnoreParens()); 404294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 4058bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 4065eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal ILV = state->getSVal(ILE, Pred->getLocationContext()); 407294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const LocationContext *LC = Pred->getLocationContext(); 408294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek state = state->bindCompoundLiteral(CL, LC, ILV); 409333e05f24717c79637e83806fd5142c752a86afaJordan Rose 410333e05f24717c79637e83806fd5142c752a86afaJordan Rose // Compound literal expressions are a GNU extension in C++. 411333e05f24717c79637e83806fd5142c752a86afaJordan Rose // Unlike in C, where CLs are lvalues, in C++ CLs are prvalues, 412333e05f24717c79637e83806fd5142c752a86afaJordan Rose // and like temporary objects created by the functional notation T() 413333e05f24717c79637e83806fd5142c752a86afaJordan Rose // CLs are destroyed at the end of the containing full-expression. 414333e05f24717c79637e83806fd5142c752a86afaJordan Rose // HOWEVER, an rvalue of array type is not something the analyzer can 415333e05f24717c79637e83806fd5142c752a86afaJordan Rose // reason about, since we expect all regions to be wrapped in Locs. 416333e05f24717c79637e83806fd5142c752a86afaJordan Rose // So we treat array CLs as lvalues as well, knowing that they will decay 417333e05f24717c79637e83806fd5142c752a86afaJordan Rose // to pointers as soon as they are used. 4183083d3c550dedf68101dd9133905c3c7d35662bdJordan Rose if (CL->isGLValue() || CL->getType()->isArrayType()) 4195eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(CL, Pred, state->BindExpr(CL, LC, state->getLValue(CL, LC))); 420294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else 4215eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(CL, Pred, state->BindExpr(CL, LC, ILV)); 422294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 423294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 424294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitDeclStmt(const DeclStmt *DS, ExplodedNode *Pred, 425294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 426294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 427294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: static variables may have an initializer, but the second 428294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // time a function is called those values may not be current. 429294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // This may need to be reflected in the CFG. 430294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 431294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Assumption: The CFG has one DeclStmt per Decl. 432294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Decl *D = *DS->decl_begin(); 433294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 434ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks if (!D || !isa<VarDecl>(D)) { 435ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks //TODO:AZ: remove explicit insertion after refactoring is done. 436ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Dst.insert(Pred); 437294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 438ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks } 439294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 440294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: all pre/post visits should eventually be handled by ::Visit(). 441294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreVisit; 442294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, DS, *this); 443294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 44466c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(dstPreVisit, Dst, *currBldrCtx); 445294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const VarDecl *VD = dyn_cast<VarDecl>(D); 446294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreVisit.begin(), E = dstPreVisit.end(); 447294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I!=E; ++I) { 448294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *N = *I; 4498bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = N->getState(); 450294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 451294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Decls without InitExpr are not initialized explicitly. 452294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const LocationContext *LC = N->getLocationContext(); 453294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 454294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (const Expr *InitEx = VD->getInit()) { 455e460c46c5d602f65354cab0879c458890273591cJordan Rose SVal InitVal = state->getSVal(InitEx, LC); 456b98b998e9a5637012ab39ad1dabdad7c798721e8Ted Kremenek 457e460c46c5d602f65354cab0879c458890273591cJordan Rose if (InitVal == state->getLValue(VD, LC) || 458e460c46c5d602f65354cab0879c458890273591cJordan Rose (VD->getType()->isArrayType() && 459e460c46c5d602f65354cab0879c458890273591cJordan Rose isa<CXXConstructExpr>(InitEx->IgnoreImplicit()))) { 46048b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // We constructed the object directly in the variable. 46148b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // No need to bind anything. 46248b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose B.generateNode(DS, N, state); 46348b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } else { 46448b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // We bound the temp obj region to the CXXConstructExpr. Now recover 46548b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // the lazy compound value when the variable is not a reference. 46648b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose if (AMgr.getLangOpts().CPlusPlus && VD->getType()->isRecordType() && 46748b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose !VD->getType()->isReferenceType() && isa<loc::MemRegionVal>(InitVal)){ 46848b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose InitVal = state->getSVal(cast<loc::MemRegionVal>(InitVal).getRegion()); 46948b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose assert(isa<nonloc::LazyCompoundVal>(InitVal)); 47048b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } 47148b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose 47248b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // Recover some path-sensitivity if a scalar value evaluated to 47348b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // UnknownVal. 47448b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose if (InitVal.isUnknown()) { 47548b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose QualType Ty = InitEx->getType(); 47648b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose if (InitEx->isGLValue()) { 47748b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose Ty = getContext().getPointerType(Ty); 47848b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } 47948b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose 4803b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek InitVal = svalBuilder.conjureSymbolVal(0, InitEx, LC, Ty, 48166c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 48248b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } 48348b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose B.takeNodes(N); 48448b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose ExplodedNodeSet Dst2; 48548b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose evalBind(Dst2, DS, N, state->getLValue(VD, LC), InitVal, true); 48648b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose B.addNodes(Dst2); 487294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 488294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 489294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else { 49032a549a64922af0903bdb777613ae7ae4490b70fTed Kremenek B.generateNode(DS, N, state); 491294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 492294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 493294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 494294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 495294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitLogicalExpr(const BinaryOperator* B, ExplodedNode *Pred, 496294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 497294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(B->getOpcode() == BO_LAnd || 498294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek B->getOpcode() == BO_LOr); 499ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks 50066c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx); 5018bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 5023f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek 5033f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek ExplodedNode *N = Pred; 5043f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek while (!isa<BlockEntrance>(N->getLocation())) { 5053f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek ProgramPoint P = N->getLocation(); 5063f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek assert(isa<PreStmt>(P)|| isa<PreStmtPurgeDeadSymbols>(P)); 5073f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek (void) P; 5083f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek assert(N->pred_size() == 1); 5093f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek N = *N->pred_begin(); 5103f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek } 5113f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek assert(N->pred_size() == 1); 5123f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek N = *N->pred_begin(); 5133f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek BlockEdge BE = cast<BlockEdge>(N->getLocation()); 5143f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek SVal X; 5153f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek 5163f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // Determine the value of the expression by introspecting how we 5173f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // got this location in the CFG. This requires looking at the previous 5183f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // block we were in and what kind of control-flow transfer was involved. 5193f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek const CFGBlock *SrcBlock = BE.getSrc(); 5203f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // The only terminator (if there is one) that makes sense is a logical op. 5213f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek CFGTerminator T = SrcBlock->getTerminator(); 5223f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek if (const BinaryOperator *Term = cast_or_null<BinaryOperator>(T.getStmt())) { 523f85f60ae3a6aad0f2b92154bf3a9601cf9a245c0Daniel Jasper (void) Term; 5243f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek assert(Term->isLogicalOp()); 5253f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek assert(SrcBlock->succ_size() == 2); 5263f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // Did we take the true or false branch? 5273f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek unsigned constant = (*SrcBlock->succ_begin() == BE.getDst()) ? 1 : 0; 5283f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek X = svalBuilder.makeIntVal(constant, B->getType()); 529294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 530294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else { 5313f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // If there is no terminator, by construction the last statement 5323f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // in SrcBlock is the value of the enclosing expression. 5337f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose // However, we still need to constrain that value to be 0 or 1. 5343f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek assert(!SrcBlock->empty()); 5353f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek CFGStmt Elem = cast<CFGStmt>(*SrcBlock->rbegin()); 5367f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose const Expr *RHS = cast<Expr>(Elem.getStmt()); 5377f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose SVal RHSVal = N->getState()->getSVal(RHS, Pred->getLocationContext()); 5387f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose 5397f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose DefinedOrUnknownSVal DefinedRHS = cast<DefinedOrUnknownSVal>(RHSVal); 5407f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose ProgramStateRef StTrue, StFalse; 5417f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose llvm::tie(StTrue, StFalse) = N->getState()->assume(DefinedRHS); 5427f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose if (StTrue) { 5437f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose if (StFalse) { 5447f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose // We can't constrain the value to 0 or 1; the best we can do is a cast. 5457f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose X = getSValBuilder().evalCast(RHSVal, B->getType(), RHS->getType()); 5467f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose } else { 5477f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose // The value is known to be true. 5487f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose X = getSValBuilder().makeIntVal(1, B->getType()); 5497f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose } 5507f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose } else { 5517f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose // The value is known to be false. 5527f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose assert(StFalse && "Infeasible path!"); 5537f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose X = getSValBuilder().makeIntVal(0, B->getType()); 5547f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose } 555294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 5563f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek 5573f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek Bldr.generateNode(B, Pred, state->BindExpr(B, Pred->getLocationContext(), X)); 558294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 559294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 560294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitInitListExpr(const InitListExpr *IE, 561294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 562294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 56366c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 564294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 5658bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 5665eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 567294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = getContext().getCanonicalType(IE->getType()); 568294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek unsigned NumInitElements = IE->getNumInits(); 569294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 570352c657f789d5633b07d56d76cf78fda05c31353Anna Zaks if (T->isArrayType() || T->isRecordType() || T->isVectorType() || 571352c657f789d5633b07d56d76cf78fda05c31353Anna Zaks T->isAnyComplexType()) { 572294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek llvm::ImmutableList<SVal> vals = getBasicVals().getEmptySValList(); 573294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 574294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Handle base case where the initializer has no elements. 575294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // e.g: static int* myArray[] = {}; 576294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (NumInitElements == 0) { 577294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal V = svalBuilder.makeCompoundVal(T, vals); 5785eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, V)); 579294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 580294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 581294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 582294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (InitListExpr::const_reverse_iterator it = IE->rbegin(), 583294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ei = IE->rend(); it != ei; ++it) { 5845eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek vals = getBasicVals().consVals(state->getSVal(cast<Expr>(*it), LCtx), 5855eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek vals); 586294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 587294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 5886b6152ba96c164a292cc0b8d8b1d4cecbec27a60Anna Zaks B.generateNode(IE, Pred, 5895eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state->BindExpr(IE, LCtx, 5905eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek svalBuilder.makeCompoundVal(T, vals))); 591294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 592294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 59313dd47a0c01f8b4a6b3fbe379218f7ba8e692d0fAnna Zaks 59489e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose // Handle scalars: int{5} and int{}. 59589e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose assert(NumInitElements <= 1); 59689e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose 59789e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose SVal V; 59889e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose if (NumInitElements == 0) 59989e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose V = getSValBuilder().makeZeroVal(T); 60089e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose else 60189e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose V = state->getSVal(IE->getInit(0), LCtx); 60289e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose 60389e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, V)); 604294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 605294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 606294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitGuardedExpr(const Expr *Ex, 607294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *L, 608294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *R, 609294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 610294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 61166c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 6128bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 6135eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 6146da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek const CFGBlock *SrcBlock = 0; 615469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek 6166da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek for (const ExplodedNode *N = Pred ; N ; N = *N->pred_begin()) { 6176da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek ProgramPoint PP = N->getLocation(); 6186da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek if (isa<PreStmtPurgeDeadSymbols>(PP) || isa<BlockEntrance>(PP)) { 6196da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek assert(N->pred_size() == 1); 6206da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek continue; 6216da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek } 6226da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek SrcBlock = cast<BlockEdge>(&PP)->getSrc(); 6236da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek break; 6246da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek } 6256da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek 6266da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek // Find the last expression in the predecessor block. That is the 6276da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek // expression that is used for the value of the ternary expression. 6286da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek bool hasValue = false; 629469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek SVal V; 6306da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek 6316da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek for (CFGBlock::const_reverse_iterator I = SrcBlock->rbegin(), 6326da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek E = SrcBlock->rend(); I != E; ++I) { 6336da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek CFGElement CE = *I; 6346da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek if (CFGStmt *CS = dyn_cast<CFGStmt>(&CE)) { 6356da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek const Expr *ValEx = cast<Expr>(CS->getStmt()); 6366da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek hasValue = true; 6376da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek V = state->getSVal(ValEx, LCtx); 638469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek break; 639469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek } 640469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek } 6416da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek 6426da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek assert(hasValue); 6436da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek (void) hasValue; 644469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek 645469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek // Generate a new node with the binding from the appropriate path. 646469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek B.generateNode(Ex, Pred, state->BindExpr(Ex, LCtx, V, true)); 647294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 648294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 649294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine:: 650294fd0a62b95f512637910bf85c7efa6c2354b50Ted KremenekVisitOffsetOfExpr(const OffsetOfExpr *OOE, 651294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, ExplodedNodeSet &Dst) { 65266c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 65380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APSInt IV; 65480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (OOE->EvaluateAsInt(IV, getContext())) { 655294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(IV.getBitWidth() == getContext().getTypeSize(OOE->getType())); 656294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(OOE->getType()->isIntegerType()); 657294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(IV.isSigned() == OOE->getType()->isSignedIntegerOrEnumerationType()); 658294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal X = svalBuilder.makeIntVal(IV); 6595eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(OOE, Pred, 6605eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek Pred->getState()->BindExpr(OOE, Pred->getLocationContext(), 6615eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek X)); 662294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 663294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: Handle the case where __builtin_offsetof is not a constant. 664294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 665294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 666294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 667294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine:: 668294fd0a62b95f512637910bf85c7efa6c2354b50Ted KremenekVisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *Ex, 669294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 670294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 67166c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx); 672294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 673294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = Ex->getTypeOfArgument(); 674294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 675294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (Ex->getKind() == UETT_SizeOf) { 676294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (!T->isIncompleteType() && !T->isConstantSizeType()) { 677294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(T->isVariableArrayType() && "Unknown non-constant-sized type."); 678294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 679540dda6f2e4982b3eab0300c804345f5b6104c11Ted Kremenek // FIXME: Add support for VLA type arguments and VLA expressions. 680294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // When that happens, we should probably refactor VLASizeChecker's code. 681294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 682294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 683294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else if (T->getAs<ObjCObjectType>()) { 684294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Some code tries to take the sizeof an ObjCObjectType, relying that 685294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // the compiler has laid out its representation. Just report Unknown 686294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // for these. 687294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 688294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 689294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 690294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 69180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APSInt Value = Ex->EvaluateKnownConstInt(getContext()); 69280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith CharUnits amt = CharUnits::fromQuantity(Value.getZExtValue()); 693294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 6948bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 6955eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(Ex, Pred->getLocationContext(), 6965eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek svalBuilder.makeIntVal(amt.getQuantity(), 697294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Ex->getType())); 698ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(Ex, Pred, state); 699294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 700294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 701294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitUnaryOperator(const UnaryOperator* U, 702294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 7038ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNodeSet &Dst) { 70466c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx); 705294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek switch (U->getOpcode()) { 706ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks default: { 707ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.takeNodes(Pred); 708ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks ExplodedNodeSet Tmp; 709ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks VisitIncrementDecrementOperator(U, Pred, Tmp); 710ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.addNodes(Tmp); 711ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks } 712294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek break; 713294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Real: { 714294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 715294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 716019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // FIXME: We don't have complex SValues yet. 717019316636b0a2d2273b945a98e52d454acee66efTed Kremenek if (Ex->getType()->isAnyComplexType()) { 718019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // Just report "Unknown." 719019316636b0a2d2273b945a98e52d454acee66efTed Kremenek break; 720019316636b0a2d2273b945a98e52d454acee66efTed Kremenek } 721294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 722019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // For all other types, UO_Real is an identity operation. 723019316636b0a2d2273b945a98e52d454acee66efTed Kremenek assert (U->getType() == Ex->getType()); 724019316636b0a2d2273b945a98e52d454acee66efTed Kremenek ProgramStateRef state = Pred->getState(); 725019316636b0a2d2273b945a98e52d454acee66efTed Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 726019316636b0a2d2273b945a98e52d454acee66efTed Kremenek Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, 7275eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state->getSVal(Ex, LCtx))); 7288ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 729294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 730294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 731c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek case UO_Imag: { 732294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 733c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // FIXME: We don't have complex SValues yet. 734c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek if (Ex->getType()->isAnyComplexType()) { 735c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // Just report "Unknown." 736c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek break; 737294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 738c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // For all other types, UO_Imag returns 0. 739c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek ProgramStateRef state = Pred->getState(); 740c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 741c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek SVal X = svalBuilder.makeZeroVal(Ex->getType()); 742c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, X)); 7438ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 744294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 745294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 746294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Plus: 747591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks assert(!U->isGLValue()); 748294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FALL-THROUGH. 749294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Deref: 750294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_AddrOf: 751294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Extension: { 752224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // FIXME: We can probably just have some magic in Environment::getSVal() 753224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // that propagates values, instead of creating a new node here. 754224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // 755294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Unary "+" is a no-op, similar to a parentheses. We still have places 756294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // where it may be a block-level expression, so we need to 757294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // generate an extra node that just propagates the value of the 758224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // subexpression. 759294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 760224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek ProgramStateRef state = Pred->getState(); 761224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 762224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, 7635eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state->getSVal(Ex, LCtx))); 7648ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 765294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 766294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 767294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_LNot: 768294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Minus: 769294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Not: { 770591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks assert (!U->isGLValue()); 771294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 772a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek ProgramStateRef state = Pred->getState(); 773a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 774294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 775a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // Get the value of the subexpression. 776a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek SVal V = state->getSVal(Ex, LCtx); 777294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 778a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek if (V.isUnknownOrUndef()) { 779a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, V)); 780a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 781a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 782294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 783a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek switch (U->getOpcode()) { 784a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek default: 785a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek llvm_unreachable("Invalid Opcode."); 786a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_Not: 787a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // FIXME: Do we need to handle promotions? 788a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek state = state->BindExpr(U, LCtx, evalComplement(cast<NonLoc>(V))); 789a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 790a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_Minus: 791a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // FIXME: Do we need to handle promotions? 792a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek state = state->BindExpr(U, LCtx, evalMinus(cast<NonLoc>(V))); 793a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 794a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_LNot: 795a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // C99 6.5.3.3: "The expression !E is equivalent to (0==E)." 796a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // 797a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // Note: technically we do "E == 0", but this is the same in the 798a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // transfer functions as "0 == E". 799a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek SVal Result; 800a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek if (isa<Loc>(V)) { 801a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Loc X = svalBuilder.makeNull(); 802a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Result = evalBinOp(state, BO_EQ, cast<Loc>(V), X, 803a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek U->getType()); 804a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 805a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek else { 806a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek nonloc::ConcreteInt X(getBasicVals().getValue(0, Ex->getType())); 807a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Result = evalBinOp(state, BO_EQ, cast<NonLoc>(V), X, 808a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek U->getType()); 809a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 810a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek 811a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek state = state->BindExpr(U, LCtx, Result); 812a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 813294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 814a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Bldr.generateNode(U, Pred, state); 8158ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 816294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 817294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 8188ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks 8198ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks} 8208ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks 8218ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaksvoid ExprEngine::VisitIncrementDecrementOperator(const UnaryOperator* U, 8228ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNode *Pred, 8238ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNodeSet &Dst) { 824294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Handle ++ and -- (both pre- and post-increment). 825294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert (U->isIncrementDecrementOp()); 826294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 827294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8289050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 8299050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ProgramStateRef state = Pred->getState(); 8309050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal loc = state->getSVal(Ex, LCtx); 8319050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8329050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Perform a load. 8339050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Tmp; 834bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Tmp, U, Ex, Pred, state, loc); 8359050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8369050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Dst2; 83766c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Tmp, Dst2, *currBldrCtx); 8389050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek for (ExplodedNodeSet::iterator I=Tmp.begin(), E=Tmp.end();I!=E;++I) { 839294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8409050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = (*I)->getState(); 8419050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek assert(LCtx == (*I)->getLocationContext()); 8429050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal V2_untested = state->getSVal(Ex, LCtx); 843294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8449050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Propagate unknown and undefined values. 8459050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (V2_untested.isUnknownOrUndef()) { 8469050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, V2_untested)); 8479050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek continue; 8489050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek } 8499050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek DefinedSVal V2 = cast<DefinedSVal>(V2_untested); 8509050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8519050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Handle all other values. 8529050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek BinaryOperator::Opcode Op = U->isIncrementOp() ? BO_Add : BO_Sub; 8539050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8549050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // If the UnaryOperator has non-location type, use its type to create the 8559050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // constant value. If the UnaryOperator has location type, create the 8569050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // constant with int type and pointer width. 8579050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal RHS; 8589050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8599050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (U->getType()->isAnyPointerType()) 8609050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek RHS = svalBuilder.makeArrayIndex(1); 861d04713598ee8af6e01b925dca4e38bfd78227dadJordan Rose else if (U->getType()->isIntegralOrEnumerationType()) 8629050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek RHS = svalBuilder.makeIntVal(1, U->getType()); 863d04713598ee8af6e01b925dca4e38bfd78227dadJordan Rose else 864d04713598ee8af6e01b925dca4e38bfd78227dadJordan Rose RHS = UnknownVal(); 8659050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8669050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal Result = evalBinOp(state, Op, V2, RHS, U->getType()); 8679050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8689050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Conjure a new symbol if necessary to recover precision. 8699050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (Result.isUnknown()){ 8709050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek DefinedOrUnknownSVal SymVal = 87166c486f275531df6362b3511fc3af6563561801bTed Kremenek svalBuilder.conjureSymbolVal(0, Ex, LCtx, currBldrCtx->blockCount()); 8729050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Result = SymVal; 873294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8749050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // If the value is a location, ++/-- should always preserve 8759050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // non-nullness. Check if the original value was non-null, and if so 8769050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // propagate that constraint. 8779050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (Loc::isLocType(U->getType())) { 8789050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek DefinedOrUnknownSVal Constraint = 8799050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek svalBuilder.evalEQ(state, V2,svalBuilder.makeZeroVal(U->getType())); 880294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8819050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (!state->assume(Constraint, true)) { 8829050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // It isn't feasible for the original value to be null. 8839050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Propagate this constraint. 8849050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Constraint = svalBuilder.evalEQ(state, SymVal, 8859050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek svalBuilder.makeZeroVal(U->getType())); 886294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8879050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8889050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->assume(Constraint, false); 8899050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek assert(state); 890294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 891294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 892294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 8939050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8949050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Since the lvalue-to-rvalue conversion is explicit in the AST, 8959050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // we bind an l-value if the operator is prefix and an lvalue (in C++). 896591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (U->isGLValue()) 8979050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->BindExpr(U, LCtx, loc); 8989050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek else 8999050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->BindExpr(U, LCtx, U->isPostfix() ? V2 : Result); 9009050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9019050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Perform the store. 9029050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.takeNodes(*I); 9039050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Dst3; 904bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalStore(Dst3, U, U, *I, state, loc, Result); 9059050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.addNodes(Dst3); 906294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 9079050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Dst.insert(Dst2); 908294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 909