ExprEngineC.cpp revision 2b6876173b36d92aaf379c29cb339d91b4d358ee
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 149852f58f50b4fc20914fbce5b4454135a42343f4Benjamin Kramer#include "clang/AST/ExprCXX.h" 15294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/StaticAnalyzer/Core/CheckerManager.h" 16294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 17294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 18294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing namespace clang; 19294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing namespace ento; 20294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing llvm::APSInt; 21294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 22294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitBinaryOperator(const BinaryOperator* B, 23294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 24294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 25d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 26294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Expr *LHS = B->getLHS()->IgnoreParens(); 27294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Expr *RHS = B->getRHS()->IgnoreParens(); 28294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 29d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // FIXME: Prechecks eventually go in ::Visit(). 30d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek ExplodedNodeSet CheckedSet; 31d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek ExplodedNodeSet Tmp2; 32d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek getCheckerManager().runCheckersForPreStmt(CheckedSet, Pred, B, *this); 33294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 34d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // With both the LHS and RHS evaluated, process the operation itself. 35d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek for (ExplodedNodeSet::iterator it=CheckedSet.begin(), ei=CheckedSet.end(); 36d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek it != ei; ++it) { 37d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 388bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = (*it)->getState(); 395eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = (*it)->getLocationContext(); 405eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal LeftV = state->getSVal(LHS, LCtx); 415eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal RightV = state->getSVal(RHS, LCtx); 42d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 43d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek BinaryOperator::Opcode Op = B->getOpcode(); 44d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 45d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek if (Op == BO_Assign) { 46d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // EXPERIMENTAL: "Conjured" symbols. 47d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // FIXME: Handle structs. 483cdf584e068056540769dab56cad333e95a89750Anna Zaks if (RightV.isUnknown()) { 4966c486f275531df6362b3511fc3af6563561801bTed Kremenek unsigned Count = currBldrCtx->blockCount(); 503b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek RightV = svalBuilder.conjureSymbolVal(0, B->getRHS(), LCtx, Count); 51294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 52d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Simulate the effects of a "store": bind the value of the RHS 53d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // to the L-Value represented by the LHS. 54591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks SVal ExprVal = B->isGLValue() ? LeftV : RightV; 555eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek evalStore(Tmp2, B, LHS, *it, state->BindExpr(B, LCtx, ExprVal), 565eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek LeftV, RightV); 57d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek continue; 58d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 59294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 60d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek if (!B->isAssignmentOp()) { 6166c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(*it, Tmp2, *currBldrCtx); 62e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks 63e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks if (B->isAdditiveOp()) { 64e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // If one of the operands is a location, conjure a symbol for the other 65e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // one (offset) if it's unknown so that memory arithmetic always 66e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // results in an ElementRegion. 67e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // TODO: This can be removed after we enable history tracking with 68e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // SymSymExpr. 6966c486f275531df6362b3511fc3af6563561801bTed Kremenek unsigned Count = currBldrCtx->blockCount(); 70e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks if (isa<Loc>(LeftV) && 71e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks RHS->getType()->isIntegerType() && RightV.isUnknown()) { 723b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek RightV = svalBuilder.conjureSymbolVal(RHS, LCtx, RHS->getType(), 733b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek Count); 74e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks } 75e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks if (isa<Loc>(RightV) && 76e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks LHS->getType()->isIntegerType() && LeftV.isUnknown()) { 773b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek LeftV = svalBuilder.conjureSymbolVal(LHS, LCtx, LHS->getType(), 783b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek Count); 79e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks } 80e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks } 81e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks 82d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Process non-assignments except commas or short-circuited 83d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // logical expressions (LAnd and LOr). 84d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal Result = evalBinOp(state, Op, LeftV, RightV, B->getType()); 85d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek if (Result.isUnknown()) { 86ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(B, *it, state); 87294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 88d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 89d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 905eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, Result); 91ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(B, *it, state); 92d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek continue; 93d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 94294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 95d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek assert (B->isCompoundAssignmentOp()); 96d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 97d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek switch (Op) { 98d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek default: 99b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid opcode for compound assignment."); 100d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_MulAssign: Op = BO_Mul; break; 101d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_DivAssign: Op = BO_Div; break; 102d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_RemAssign: Op = BO_Rem; break; 103d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_AddAssign: Op = BO_Add; break; 104d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_SubAssign: Op = BO_Sub; break; 105d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_ShlAssign: Op = BO_Shl; break; 106d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_ShrAssign: Op = BO_Shr; break; 107d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_AndAssign: Op = BO_And; break; 108d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_XorAssign: Op = BO_Xor; break; 109d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_OrAssign: Op = BO_Or; break; 110d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 111294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 112d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Perform a load (the LHS). This performs the checks for 113d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // null dereferences, and so on. 114d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek ExplodedNodeSet Tmp; 115d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal location = LeftV; 116bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Tmp, B, LHS, *it, state, location); 117d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 118d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek for (ExplodedNodeSet::iterator I = Tmp.begin(), E = Tmp.end(); I != E; 119d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek ++I) { 120d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 121d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek state = (*I)->getState(); 1225eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = (*I)->getLocationContext(); 1235eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal V = state->getSVal(LHS, LCtx); 124294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 125d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Get the computation type. 126d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek QualType CTy = 127294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek cast<CompoundAssignOperator>(B)->getComputationResultType(); 128d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek CTy = getContext().getCanonicalType(CTy); 129d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 130d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek QualType CLHSTy = 131294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek cast<CompoundAssignOperator>(B)->getComputationLHSType(); 132d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek CLHSTy = getContext().getCanonicalType(CLHSTy); 133d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 134d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek QualType LTy = getContext().getCanonicalType(LHS->getType()); 135d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 136d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Promote LHS. 137d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek V = svalBuilder.evalCast(V, CLHSTy, LTy); 138d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 139d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Compute the result of the operation. 140d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal Result = svalBuilder.evalCast(evalBinOp(state, Op, V, RightV, CTy), 141d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek B->getType(), CTy); 142d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 143d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // EXPERIMENTAL: "Conjured" symbols. 144d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // FIXME: Handle structs. 145d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 146d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal LHSVal; 147d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 14876462f00854171d2aa3ebc34f9aac1c60021b0eaAnna Zaks if (Result.isUnknown()) { 149d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // The symbolic value is actually for the type of the left-hand side 150d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // expression, not the computation type, as this is the value the 151d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // LValue on the LHS will bind to. 15266c486f275531df6362b3511fc3af6563561801bTed Kremenek LHSVal = svalBuilder.conjureSymbolVal(0, B->getRHS(), LCtx, LTy, 15366c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 154d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // However, we need to convert the symbol to the computation type. 155d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek Result = svalBuilder.evalCast(LHSVal, CTy, LTy); 156d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 157d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek else { 158d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // The left-hand side may bind to a different value then the 159d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // computation type. 160d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek LHSVal = svalBuilder.evalCast(Result, LTy, CTy); 161294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 162d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 163d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // In C++, assignment and compound assignment operators return an 164d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // lvalue. 165591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (B->isGLValue()) 1665eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, location); 167d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek else 1685eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, Result); 169d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 170d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek evalStore(Tmp2, B, LHS, *I, state, location, LHSVal); 171294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 172294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 173294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 174d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // FIXME: postvisits eventually go in ::Visit() 175d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek getCheckerManager().runCheckersForPostStmt(Dst, Tmp2, B, *this); 176294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 177294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 178294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitBlockExpr(const BlockExpr *BE, ExplodedNode *Pred, 179294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 180294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 181294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek CanQualType T = getContext().getCanonicalType(BE->getType()); 18285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 18385d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // Get the value of the block itself. 184294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal V = svalBuilder.getBlockPointer(BE->getBlockDecl(), T, 185294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Pred->getLocationContext()); 186294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 18785d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek ProgramStateRef State = Pred->getState(); 18885d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 18985d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // If we created a new MemRegion for the block, we should explicitly bind 19085d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // the captured variables. 19185d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek if (const BlockDataRegion *BDR = 19285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek dyn_cast_or_null<BlockDataRegion>(V.getAsRegion())) { 19385d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 19485d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek BlockDataRegion::referenced_vars_iterator I = BDR->referenced_vars_begin(), 19585d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek E = BDR->referenced_vars_end(); 19685d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 19785d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek for (; I != E; ++I) { 19885d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek const MemRegion *capturedR = I.getCapturedRegion(); 19985d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek const MemRegion *originalR = I.getOriginalRegion(); 20085d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek if (capturedR != originalR) { 20185d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek SVal originalV = State->getSVal(loc::MemRegionVal(originalR)); 20285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek State = State->bindLoc(loc::MemRegionVal(capturedR), originalV); 20385d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 20485d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 20585d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 20685d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 207294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet Tmp; 20866c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Pred, Tmp, *currBldrCtx); 2095eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek Bldr.generateNode(BE, Pred, 21085d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek State->BindExpr(BE, Pred->getLocationContext(), V), 211fa06f0464a04bb7fce1fcfb3780d151bb029e00cJordan Rose 0, ProgramPoint::PostLValueKind); 212294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 213294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: Move all post/pre visits to ::Visit(). 214294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPostStmt(Dst, Tmp, BE, *this); 215294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 216294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 217294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCast(const CastExpr *CastE, const Expr *Ex, 218294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, ExplodedNodeSet &Dst) { 219294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 220294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreStmt; 221294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreStmt, Pred, CastE, *this); 222294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 2237864435ef2bce200224120bd1df3aed98ea5b99aJohn McCall if (CastE->getCastKind() == CK_LValueToRValue) { 224294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end(); 225294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I!=E; ++I) { 226294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *subExprNode = *I; 2278bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = subExprNode->getState(); 2285eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = subExprNode->getLocationContext(); 229bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Dst, CastE, CastE, subExprNode, state, state->getSVal(Ex, LCtx)); 230294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 231294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 232294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 233294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 234294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // All other casts. 235294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = CastE->getType(); 236294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType ExTy = Ex->getType(); 237294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 238294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (const ExplicitCastExpr *ExCast=dyn_cast_or_null<ExplicitCastExpr>(CastE)) 239294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek T = ExCast->getTypeAsWritten(); 240294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 24166c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(dstPreStmt, Dst, *currBldrCtx); 242294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end(); 243294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I != E; ++I) { 244294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 245294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Pred = *I; 246c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose ProgramStateRef state = Pred->getState(); 247c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose const LocationContext *LCtx = Pred->getLocationContext(); 248c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose 249294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek switch (CastE->getCastKind()) { 250294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_LValueToRValue: 251b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("LValueToRValue casts handled earlier."); 252294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ToVoid: 253294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 254294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // The analyzer doesn't do anything special with these casts, 255294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // since it understands retain/release semantics already. 25633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 25733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 25833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 25933e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: // Fall-through. 260ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 2617a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // The analyser can ignore atomic casts for now, although some future 2627a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // checkers may want to make certain that you're not modifying the same 2637a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // value through atomic and nonatomic pointers. 2647a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 2657a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 266294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // True no-ops. 267294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_NoOp: 268c210cb7a358d14cdd93b58562f33ff5ed2d895c1Jordan Rose case CK_ConstructorConversion: 269c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose case CK_UserDefinedConversion: 270a6c66cedc022c9e5d45a937d6b8cff491a6bf81bEli Friedman case CK_FunctionToPointerDecay: 271a6c66cedc022c9e5d45a937d6b8cff491a6bf81bEli Friedman case CK_BuiltinFnToFnPtr: { 272294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Copy the SVal of Ex to CastE. 2738bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 2745eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 2755eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal V = state->getSVal(Ex, LCtx); 2765eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CastE, LCtx, V); 277ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 278294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 279294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 2800156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose case CK_MemberPointerToBoolean: 2810156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose // FIXME: For now, member pointers are represented by void *. 2820156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose // FALLTHROUGH 283294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_Dependent: 284294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ArrayToPointerDecay: 285294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BitCast: 286294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralCast: 287294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_NullToPointer: 288294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToPointer: 289294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_PointerToIntegral: 290294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_PointerToBoolean: 291294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToBoolean: 292294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToFloating: 293294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingToIntegral: 294294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingToBoolean: 295294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingCast: 296294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingRealToComplex: 297294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToReal: 298294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToBoolean: 299294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexCast: 300294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToIntegralComplex: 301294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralRealToComplex: 302294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToReal: 303294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToBoolean: 304294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexCast: 305294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToFloatingComplex: 3061d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 3071d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 308294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_AnyPointerToBlockPointerCast: 309e6b9d802fb7b16d93474c4f1c179ab36202e8a8bGuy Benyei case CK_ObjCObjectLValueCast: 310e6b9d802fb7b16d93474c4f1c179ab36202e8a8bGuy Benyei case CK_ZeroToOCLEvent: { 311294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Delegate to SValBuilder to process. 3125eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal V = state->getSVal(Ex, LCtx); 313294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek V = svalBuilder.evalCast(V, T, ExTy); 3145eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CastE, LCtx, V); 315ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 316294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 317294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 318294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_DerivedToBase: 319294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_UncheckedDerivedToBase: { 320294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // For DerivedToBase cast, delegate to the store manager. 3215eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal val = state->getSVal(Ex, LCtx); 3222c5f8d79ed128892fa548a3308a938a3a53fbb5eJordan Rose val = getStoreManager().evalDerivedToBase(val, CastE); 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 SVal val = state->getSVal(Ex, LCtx); 330e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 331e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Compute the type of the result. 332e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks QualType resultType = CastE->getType(); 333591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (CastE->isGLValue()) 334e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks resultType = getContext().getPointerType(resultType); 335e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 336e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks bool Failed = false; 337e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 338e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Check if the value being cast evaluates to 0. 339e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (val.isZeroConstant()) 340e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks Failed = true; 341e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Else, evaluate the cast. 342e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks else 343e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks val = getStoreManager().evalDynamicCast(val, T, Failed); 344e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 345e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (Failed) { 346a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks if (T->isReferenceType()) { 347a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks // A bad_cast exception is thrown if input value is a reference. 348a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks // Currently, we model this, by generating a sink. 349fa06f0464a04bb7fce1fcfb3780d151bb029e00cJordan Rose Bldr.generateSink(CastE, Pred, state); 350a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks continue; 351a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks } else { 3527ea1c5639764aa3ebe124f4350c5f2b3be795667Anna Zaks // If the cast fails on a pointer, bind to 0. 3537ea1c5639764aa3ebe124f4350c5f2b3be795667Anna Zaks state = state->BindExpr(CastE, LCtx, svalBuilder.makeNull()); 354a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks } 355e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } else { 356e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // If we don't know if the cast succeeded, conjure a new symbol. 357e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (val.isUnknown()) { 3583b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek DefinedOrUnknownSVal NewSym = 3593b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek svalBuilder.conjureSymbolVal(0, CastE, LCtx, resultType, 36066c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 361e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks state = state->BindExpr(CastE, LCtx, NewSym); 362e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } else 363e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Else, bind to the derived region value. 364e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks state = state->BindExpr(CastE, LCtx, val); 365e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } 366e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks Bldr.generateNode(CastE, Pred, state); 367e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks continue; 368e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } 3690156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose case CK_NullToMemberPointer: { 3700156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose // FIXME: For now, member pointers are represented by void *. 3710156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose SVal V = svalBuilder.makeIntValWithPtrWidth(0, true); 3720156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose state = state->BindExpr(CastE, LCtx, V); 3730156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose Bldr.generateNode(CastE, Pred, state); 3740156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose continue; 3750156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose } 376e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Various C++ casts that are not handled yet. 377294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ToUnion: 378294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BaseToDerived: 379294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BaseToDerivedMemberPointer: 380294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_DerivedToBaseMemberPointer: 3814d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 382294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_VectorSplat: 3835b8c69494881b7d35bc6244b4a19be0cc2eab368Jordan Rose case CK_LValueBitCast: { 384294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Recover some path-sensitivty by conjuring a new value. 385294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType resultType = CastE->getType(); 386591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (CastE->isGLValue()) 387294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek resultType = getContext().getPointerType(resultType); 3883b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek SVal result = svalBuilder.conjureSymbolVal(0, CastE, LCtx, 38966c486f275531df6362b3511fc3af6563561801bTed Kremenek resultType, 39066c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 391c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose state = state->BindExpr(CastE, LCtx, result); 392ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 393294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 394294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 395294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 396294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 397294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 398294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 399294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCompoundLiteralExpr(const CompoundLiteralExpr *CL, 400294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 401294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 40266c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 403d231d0130a95336610ab9a42eaeb2cdac19992f3Anna Zaks 404294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const InitListExpr *ILE 405294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek = cast<InitListExpr>(CL->getInitializer()->IgnoreParens()); 406294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 4078bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 4085eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal ILV = state->getSVal(ILE, Pred->getLocationContext()); 409294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const LocationContext *LC = Pred->getLocationContext(); 410294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek state = state->bindCompoundLiteral(CL, LC, ILV); 411333e05f24717c79637e83806fd5142c752a86afaJordan Rose 412333e05f24717c79637e83806fd5142c752a86afaJordan Rose // Compound literal expressions are a GNU extension in C++. 413333e05f24717c79637e83806fd5142c752a86afaJordan Rose // Unlike in C, where CLs are lvalues, in C++ CLs are prvalues, 414333e05f24717c79637e83806fd5142c752a86afaJordan Rose // and like temporary objects created by the functional notation T() 415333e05f24717c79637e83806fd5142c752a86afaJordan Rose // CLs are destroyed at the end of the containing full-expression. 416333e05f24717c79637e83806fd5142c752a86afaJordan Rose // HOWEVER, an rvalue of array type is not something the analyzer can 417333e05f24717c79637e83806fd5142c752a86afaJordan Rose // reason about, since we expect all regions to be wrapped in Locs. 418333e05f24717c79637e83806fd5142c752a86afaJordan Rose // So we treat array CLs as lvalues as well, knowing that they will decay 419333e05f24717c79637e83806fd5142c752a86afaJordan Rose // to pointers as soon as they are used. 4203083d3c550dedf68101dd9133905c3c7d35662bdJordan Rose if (CL->isGLValue() || CL->getType()->isArrayType()) 4215eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(CL, Pred, state->BindExpr(CL, LC, state->getLValue(CL, LC))); 422294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else 4235eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(CL, Pred, state->BindExpr(CL, LC, ILV)); 424294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 425294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 4262b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks/// The GDM component containing the set of global variables which have been 4272b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks/// previously initialized with explicit initializers. 4282b6876173b36d92aaf379c29cb339d91b4d358eeAnna ZaksREGISTER_TRAIT_WITH_PROGRAMSTATE(InitializedGlobalsSet, 4292b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks llvm::ImmutableSet<const VarDecl *> ) 4302b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 431294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitDeclStmt(const DeclStmt *DS, ExplodedNode *Pred, 432294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 433294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Assumption: The CFG has one DeclStmt per Decl. 434294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Decl *D = *DS->decl_begin(); 4352b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks const VarDecl *VD = dyn_cast_or_null<VarDecl>(D); 4362b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 4372b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks if (!D || !VD) { 438ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks //TODO:AZ: remove explicit insertion after refactoring is done. 439ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Dst.insert(Pred); 440294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 441ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks } 4422b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 4432b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks // Check if a value has been previously initialized. There will be an entry in 4442b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks // the set for variables with global storage which have been previously 4452b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks // initialized. 4462b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks if (VD->hasGlobalStorage()) 4472b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks if (Pred->getState()->contains<InitializedGlobalsSet>(VD)) { 4482b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks Dst.insert(Pred); 4492b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks return; 4502b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks } 451294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 452294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: all pre/post visits should eventually be handled by ::Visit(). 453294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreVisit; 454294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, DS, *this); 455294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 45666c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(dstPreVisit, Dst, *currBldrCtx); 457294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreVisit.begin(), E = dstPreVisit.end(); 458294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I!=E; ++I) { 459294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *N = *I; 4608bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = N->getState(); 461294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const LocationContext *LC = N->getLocationContext(); 4622b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 4632b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks // Decls without InitExpr are not initialized explicitly. 464294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (const Expr *InitEx = VD->getInit()) { 4652b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 4662b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks // Note in the state that the initialization has occurred. 4672b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks ExplodedNode *UpdatedN = N; 4682b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks if (VD->hasGlobalStorage()) { 4692b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks state = state->add<InitializedGlobalsSet>(VD); 4702b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks UpdatedN = B.generateNode(DS, N, state); 4712b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks } 4722b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 473e460c46c5d602f65354cab0879c458890273591cJordan Rose SVal InitVal = state->getSVal(InitEx, LC); 474b98b998e9a5637012ab39ad1dabdad7c798721e8Ted Kremenek 475e460c46c5d602f65354cab0879c458890273591cJordan Rose if (InitVal == state->getLValue(VD, LC) || 476e460c46c5d602f65354cab0879c458890273591cJordan Rose (VD->getType()->isArrayType() && 477e460c46c5d602f65354cab0879c458890273591cJordan Rose isa<CXXConstructExpr>(InitEx->IgnoreImplicit()))) { 47848b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // We constructed the object directly in the variable. 47948b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // No need to bind anything. 4802b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks B.generateNode(DS, UpdatedN, state); 48148b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } else { 48248b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // We bound the temp obj region to the CXXConstructExpr. Now recover 48348b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // the lazy compound value when the variable is not a reference. 48448b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose if (AMgr.getLangOpts().CPlusPlus && VD->getType()->isRecordType() && 48548b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose !VD->getType()->isReferenceType() && isa<loc::MemRegionVal>(InitVal)){ 48648b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose InitVal = state->getSVal(cast<loc::MemRegionVal>(InitVal).getRegion()); 48748b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose assert(isa<nonloc::LazyCompoundVal>(InitVal)); 48848b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } 48948b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose 49048b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // Recover some path-sensitivity if a scalar value evaluated to 49148b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // UnknownVal. 49248b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose if (InitVal.isUnknown()) { 49348b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose QualType Ty = InitEx->getType(); 49448b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose if (InitEx->isGLValue()) { 49548b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose Ty = getContext().getPointerType(Ty); 49648b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } 49748b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose 4983b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek InitVal = svalBuilder.conjureSymbolVal(0, InitEx, LC, Ty, 49966c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 50048b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } 5012b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 5022b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 5032b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks B.takeNodes(UpdatedN); 50448b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose ExplodedNodeSet Dst2; 5052b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks evalBind(Dst2, DS, UpdatedN, state->getLValue(VD, LC), InitVal, true); 50648b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose B.addNodes(Dst2); 507294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 508294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 509294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else { 51032a549a64922af0903bdb777613ae7ae4490b70fTed Kremenek B.generateNode(DS, N, state); 511294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 512294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 513294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 514294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 515294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitLogicalExpr(const BinaryOperator* B, ExplodedNode *Pred, 516294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 517294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(B->getOpcode() == BO_LAnd || 518294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek B->getOpcode() == BO_LOr); 519ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks 52066c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx); 5218bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 5223f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek 5233f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek ExplodedNode *N = Pred; 5243f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek while (!isa<BlockEntrance>(N->getLocation())) { 5253f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek ProgramPoint P = N->getLocation(); 5263f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek assert(isa<PreStmt>(P)|| isa<PreStmtPurgeDeadSymbols>(P)); 5273f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek (void) P; 5283f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek assert(N->pred_size() == 1); 5293f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek N = *N->pred_begin(); 5303f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek } 5313f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek assert(N->pred_size() == 1); 5323f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek N = *N->pred_begin(); 5333f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek BlockEdge BE = cast<BlockEdge>(N->getLocation()); 5343f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek SVal X; 5353f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek 5363f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // Determine the value of the expression by introspecting how we 5373f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // got this location in the CFG. This requires looking at the previous 5383f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // block we were in and what kind of control-flow transfer was involved. 5393f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek const CFGBlock *SrcBlock = BE.getSrc(); 5403f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // The only terminator (if there is one) that makes sense is a logical op. 5413f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek CFGTerminator T = SrcBlock->getTerminator(); 5423f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek if (const BinaryOperator *Term = cast_or_null<BinaryOperator>(T.getStmt())) { 543f85f60ae3a6aad0f2b92154bf3a9601cf9a245c0Daniel Jasper (void) Term; 5443f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek assert(Term->isLogicalOp()); 5453f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek assert(SrcBlock->succ_size() == 2); 5463f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // Did we take the true or false branch? 5473f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek unsigned constant = (*SrcBlock->succ_begin() == BE.getDst()) ? 1 : 0; 5483f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek X = svalBuilder.makeIntVal(constant, B->getType()); 549294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 550294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else { 5513f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // If there is no terminator, by construction the last statement 5523f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek // in SrcBlock is the value of the enclosing expression. 5537f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose // However, we still need to constrain that value to be 0 or 1. 5543f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek assert(!SrcBlock->empty()); 5553f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek CFGStmt Elem = cast<CFGStmt>(*SrcBlock->rbegin()); 5567f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose const Expr *RHS = cast<Expr>(Elem.getStmt()); 5577f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose SVal RHSVal = N->getState()->getSVal(RHS, Pred->getLocationContext()); 5587f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose 559707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek if (RHSVal.isUndef()) { 560707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek X = RHSVal; 561707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek } else { 562707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek DefinedOrUnknownSVal DefinedRHS = cast<DefinedOrUnknownSVal>(RHSVal); 563707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek ProgramStateRef StTrue, StFalse; 564707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek llvm::tie(StTrue, StFalse) = N->getState()->assume(DefinedRHS); 565707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek if (StTrue) { 566707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek if (StFalse) { 567707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek // We can't constrain the value to 0 or 1. 568707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek // The best we can do is a cast. 569707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek X = getSValBuilder().evalCast(RHSVal, B->getType(), RHS->getType()); 570707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek } else { 571707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek // The value is known to be true. 572707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek X = getSValBuilder().makeIntVal(1, B->getType()); 573707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek } 5747f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose } else { 575707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek // The value is known to be false. 576707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek assert(StFalse && "Infeasible path!"); 577707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek X = getSValBuilder().makeIntVal(0, B->getType()); 5787f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose } 5797f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose } 580294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 5813f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek Bldr.generateNode(B, Pred, state->BindExpr(B, Pred->getLocationContext(), X)); 582294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 583294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 584294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitInitListExpr(const InitListExpr *IE, 585294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 586294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 58766c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 588294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 5898bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 5905eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 591294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = getContext().getCanonicalType(IE->getType()); 592294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek unsigned NumInitElements = IE->getNumInits(); 593294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 594352c657f789d5633b07d56d76cf78fda05c31353Anna Zaks if (T->isArrayType() || T->isRecordType() || T->isVectorType() || 595352c657f789d5633b07d56d76cf78fda05c31353Anna Zaks T->isAnyComplexType()) { 596294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek llvm::ImmutableList<SVal> vals = getBasicVals().getEmptySValList(); 597294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 598294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Handle base case where the initializer has no elements. 599294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // e.g: static int* myArray[] = {}; 600294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (NumInitElements == 0) { 601294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal V = svalBuilder.makeCompoundVal(T, vals); 6025eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, V)); 603294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 604294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 605294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 606294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (InitListExpr::const_reverse_iterator it = IE->rbegin(), 607294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ei = IE->rend(); it != ei; ++it) { 6081994e3993e5e2c606f4ab22563768af6f03dad30Ted Kremenek SVal V = state->getSVal(cast<Expr>(*it), LCtx); 6091994e3993e5e2c606f4ab22563768af6f03dad30Ted Kremenek if (dyn_cast_or_null<CXXTempObjectRegion>(V.getAsRegion())) 6101994e3993e5e2c606f4ab22563768af6f03dad30Ted Kremenek V = UnknownVal(); 6111994e3993e5e2c606f4ab22563768af6f03dad30Ted Kremenek vals = getBasicVals().consVals(V, vals); 612294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 613294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 6146b6152ba96c164a292cc0b8d8b1d4cecbec27a60Anna Zaks B.generateNode(IE, Pred, 6155eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state->BindExpr(IE, LCtx, 6165eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek svalBuilder.makeCompoundVal(T, vals))); 617294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 618294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 61913dd47a0c01f8b4a6b3fbe379218f7ba8e692d0fAnna Zaks 62089e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose // Handle scalars: int{5} and int{}. 62189e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose assert(NumInitElements <= 1); 62289e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose 62389e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose SVal V; 62489e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose if (NumInitElements == 0) 62589e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose V = getSValBuilder().makeZeroVal(T); 62689e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose else 62789e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose V = state->getSVal(IE->getInit(0), LCtx); 62889e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose 62989e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, V)); 630294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 631294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 632294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitGuardedExpr(const Expr *Ex, 633294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *L, 634294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *R, 635294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 636294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 63766c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 6388bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 6395eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 6406da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek const CFGBlock *SrcBlock = 0; 641469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek 6426da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek for (const ExplodedNode *N = Pred ; N ; N = *N->pred_begin()) { 6436da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek ProgramPoint PP = N->getLocation(); 6446da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek if (isa<PreStmtPurgeDeadSymbols>(PP) || isa<BlockEntrance>(PP)) { 6456da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek assert(N->pred_size() == 1); 6466da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek continue; 6476da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek } 6486da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek SrcBlock = cast<BlockEdge>(&PP)->getSrc(); 6496da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek break; 6506da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek } 6516da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek 6526da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek // Find the last expression in the predecessor block. That is the 6536da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek // expression that is used for the value of the ternary expression. 6546da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek bool hasValue = false; 655469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek SVal V; 6566da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek 6576da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek for (CFGBlock::const_reverse_iterator I = SrcBlock->rbegin(), 6586da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek E = SrcBlock->rend(); I != E; ++I) { 6596da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek CFGElement CE = *I; 6606da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek if (CFGStmt *CS = dyn_cast<CFGStmt>(&CE)) { 6616da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek const Expr *ValEx = cast<Expr>(CS->getStmt()); 6626da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek hasValue = true; 6636da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek V = state->getSVal(ValEx, LCtx); 664469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek break; 665469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek } 666469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek } 6676da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek 6686da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek assert(hasValue); 6696da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek (void) hasValue; 670469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek 671469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek // Generate a new node with the binding from the appropriate path. 672469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek B.generateNode(Ex, Pred, state->BindExpr(Ex, LCtx, V, true)); 673294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 674294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 675294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine:: 676294fd0a62b95f512637910bf85c7efa6c2354b50Ted KremenekVisitOffsetOfExpr(const OffsetOfExpr *OOE, 677294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, ExplodedNodeSet &Dst) { 67866c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 67980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APSInt IV; 68080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (OOE->EvaluateAsInt(IV, getContext())) { 681294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(IV.getBitWidth() == getContext().getTypeSize(OOE->getType())); 682294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(OOE->getType()->isIntegerType()); 683294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(IV.isSigned() == OOE->getType()->isSignedIntegerOrEnumerationType()); 684294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal X = svalBuilder.makeIntVal(IV); 6855eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(OOE, Pred, 6865eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek Pred->getState()->BindExpr(OOE, Pred->getLocationContext(), 6875eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek X)); 688294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 689294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: Handle the case where __builtin_offsetof is not a constant. 690294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 691294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 692294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 693294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine:: 694294fd0a62b95f512637910bf85c7efa6c2354b50Ted KremenekVisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *Ex, 695294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 696294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 69766c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx); 698294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 699294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = Ex->getTypeOfArgument(); 700294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 701294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (Ex->getKind() == UETT_SizeOf) { 702294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (!T->isIncompleteType() && !T->isConstantSizeType()) { 703294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(T->isVariableArrayType() && "Unknown non-constant-sized type."); 704294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 705540dda6f2e4982b3eab0300c804345f5b6104c11Ted Kremenek // FIXME: Add support for VLA type arguments and VLA expressions. 706294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // When that happens, we should probably refactor VLASizeChecker's code. 707294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 708294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 709294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else if (T->getAs<ObjCObjectType>()) { 710294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Some code tries to take the sizeof an ObjCObjectType, relying that 711294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // the compiler has laid out its representation. Just report Unknown 712294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // for these. 713294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 714294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 715294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 716294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 71780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APSInt Value = Ex->EvaluateKnownConstInt(getContext()); 71880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith CharUnits amt = CharUnits::fromQuantity(Value.getZExtValue()); 719294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 7208bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 7215eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(Ex, Pred->getLocationContext(), 7225eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek svalBuilder.makeIntVal(amt.getQuantity(), 723294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Ex->getType())); 724ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(Ex, Pred, state); 725294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 726294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 727294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitUnaryOperator(const UnaryOperator* U, 728294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 7298ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNodeSet &Dst) { 73066c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx); 731294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek switch (U->getOpcode()) { 732ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks default: { 733ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.takeNodes(Pred); 734ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks ExplodedNodeSet Tmp; 735ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks VisitIncrementDecrementOperator(U, Pred, Tmp); 736ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.addNodes(Tmp); 737ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks } 738294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek break; 739294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Real: { 740294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 741294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 742019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // FIXME: We don't have complex SValues yet. 743019316636b0a2d2273b945a98e52d454acee66efTed Kremenek if (Ex->getType()->isAnyComplexType()) { 744019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // Just report "Unknown." 745019316636b0a2d2273b945a98e52d454acee66efTed Kremenek break; 746019316636b0a2d2273b945a98e52d454acee66efTed Kremenek } 747294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 748019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // For all other types, UO_Real is an identity operation. 749019316636b0a2d2273b945a98e52d454acee66efTed Kremenek assert (U->getType() == Ex->getType()); 750019316636b0a2d2273b945a98e52d454acee66efTed Kremenek ProgramStateRef state = Pred->getState(); 751019316636b0a2d2273b945a98e52d454acee66efTed Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 752019316636b0a2d2273b945a98e52d454acee66efTed Kremenek Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, 7535eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state->getSVal(Ex, LCtx))); 7548ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 755294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 756294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 757c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek case UO_Imag: { 758294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 759c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // FIXME: We don't have complex SValues yet. 760c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek if (Ex->getType()->isAnyComplexType()) { 761c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // Just report "Unknown." 762c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek break; 763294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 764c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // For all other types, UO_Imag returns 0. 765c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek ProgramStateRef state = Pred->getState(); 766c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 767c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek SVal X = svalBuilder.makeZeroVal(Ex->getType()); 768c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, X)); 7698ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 770294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 771294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 772294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Plus: 773591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks assert(!U->isGLValue()); 774294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FALL-THROUGH. 775294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Deref: 776294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_AddrOf: 777294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Extension: { 778224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // FIXME: We can probably just have some magic in Environment::getSVal() 779224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // that propagates values, instead of creating a new node here. 780224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // 781294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Unary "+" is a no-op, similar to a parentheses. We still have places 782294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // where it may be a block-level expression, so we need to 783294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // generate an extra node that just propagates the value of the 784224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // subexpression. 785294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 786224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek ProgramStateRef state = Pred->getState(); 787224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 788224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, 7895eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state->getSVal(Ex, LCtx))); 7908ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 791294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 792294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 793294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_LNot: 794294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Minus: 795294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Not: { 796591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks assert (!U->isGLValue()); 797294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 798a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek ProgramStateRef state = Pred->getState(); 799a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 800294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 801a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // Get the value of the subexpression. 802a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek SVal V = state->getSVal(Ex, LCtx); 803294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 804a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek if (V.isUnknownOrUndef()) { 805a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, V)); 806a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 807a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 808294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 809a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek switch (U->getOpcode()) { 810a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek default: 811a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek llvm_unreachable("Invalid Opcode."); 812a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_Not: 813a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // FIXME: Do we need to handle promotions? 814a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek state = state->BindExpr(U, LCtx, evalComplement(cast<NonLoc>(V))); 815a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 816a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_Minus: 817a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // FIXME: Do we need to handle promotions? 818a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek state = state->BindExpr(U, LCtx, evalMinus(cast<NonLoc>(V))); 819a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 820a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_LNot: 821a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // C99 6.5.3.3: "The expression !E is equivalent to (0==E)." 822a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // 823a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // Note: technically we do "E == 0", but this is the same in the 824a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // transfer functions as "0 == E". 825a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek SVal Result; 826a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek if (isa<Loc>(V)) { 827a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Loc X = svalBuilder.makeNull(); 828a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Result = evalBinOp(state, BO_EQ, cast<Loc>(V), X, 829a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek U->getType()); 830a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 8319195caf28f2a5dcef1e299bf3e5232a018ca1c68Ted Kremenek else if (Ex->getType()->isFloatingType()) { 8329195caf28f2a5dcef1e299bf3e5232a018ca1c68Ted Kremenek // FIXME: handle floating point types. 8339195caf28f2a5dcef1e299bf3e5232a018ca1c68Ted Kremenek Result = UnknownVal(); 8349195caf28f2a5dcef1e299bf3e5232a018ca1c68Ted Kremenek } else { 835a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek nonloc::ConcreteInt X(getBasicVals().getValue(0, Ex->getType())); 836a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Result = evalBinOp(state, BO_EQ, cast<NonLoc>(V), X, 837a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek U->getType()); 838a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 839a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek 840a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek state = state->BindExpr(U, LCtx, Result); 841a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 842294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 843a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Bldr.generateNode(U, Pred, state); 8448ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 845294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 846294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 8478ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks 8488ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks} 8498ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks 8508ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaksvoid ExprEngine::VisitIncrementDecrementOperator(const UnaryOperator* U, 8518ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNode *Pred, 8528ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNodeSet &Dst) { 853294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Handle ++ and -- (both pre- and post-increment). 854294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert (U->isIncrementDecrementOp()); 855294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 856294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8579050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 8589050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ProgramStateRef state = Pred->getState(); 8599050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal loc = state->getSVal(Ex, LCtx); 8609050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8619050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Perform a load. 8629050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Tmp; 863bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Tmp, U, Ex, Pred, state, loc); 8649050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8659050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Dst2; 86666c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Tmp, Dst2, *currBldrCtx); 8679050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek for (ExplodedNodeSet::iterator I=Tmp.begin(), E=Tmp.end();I!=E;++I) { 868294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8699050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = (*I)->getState(); 8709050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek assert(LCtx == (*I)->getLocationContext()); 8719050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal V2_untested = state->getSVal(Ex, LCtx); 872294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8739050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Propagate unknown and undefined values. 8749050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (V2_untested.isUnknownOrUndef()) { 8759050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, V2_untested)); 8769050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek continue; 8779050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek } 8789050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek DefinedSVal V2 = cast<DefinedSVal>(V2_untested); 8799050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8809050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Handle all other values. 8819050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek BinaryOperator::Opcode Op = U->isIncrementOp() ? BO_Add : BO_Sub; 8829050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8839050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // If the UnaryOperator has non-location type, use its type to create the 8849050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // constant value. If the UnaryOperator has location type, create the 8859050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // constant with int type and pointer width. 8869050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal RHS; 8879050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8889050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (U->getType()->isAnyPointerType()) 8899050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek RHS = svalBuilder.makeArrayIndex(1); 890d04713598ee8af6e01b925dca4e38bfd78227dadJordan Rose else if (U->getType()->isIntegralOrEnumerationType()) 8919050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek RHS = svalBuilder.makeIntVal(1, U->getType()); 892d04713598ee8af6e01b925dca4e38bfd78227dadJordan Rose else 893d04713598ee8af6e01b925dca4e38bfd78227dadJordan Rose RHS = UnknownVal(); 8949050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8959050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal Result = evalBinOp(state, Op, V2, RHS, U->getType()); 8969050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8979050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Conjure a new symbol if necessary to recover precision. 8989050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (Result.isUnknown()){ 8999050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek DefinedOrUnknownSVal SymVal = 90066c486f275531df6362b3511fc3af6563561801bTed Kremenek svalBuilder.conjureSymbolVal(0, Ex, LCtx, currBldrCtx->blockCount()); 9019050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Result = SymVal; 902294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 9039050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // If the value is a location, ++/-- should always preserve 9049050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // non-nullness. Check if the original value was non-null, and if so 9059050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // propagate that constraint. 9069050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (Loc::isLocType(U->getType())) { 9079050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek DefinedOrUnknownSVal Constraint = 9089050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek svalBuilder.evalEQ(state, V2,svalBuilder.makeZeroVal(U->getType())); 909294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 9109050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (!state->assume(Constraint, true)) { 9119050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // It isn't feasible for the original value to be null. 9129050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Propagate this constraint. 9139050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Constraint = svalBuilder.evalEQ(state, SymVal, 9149050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek svalBuilder.makeZeroVal(U->getType())); 915294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 9169050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9179050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->assume(Constraint, false); 9189050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek assert(state); 919294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 920294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 921294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 9229050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9239050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Since the lvalue-to-rvalue conversion is explicit in the AST, 9249050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // we bind an l-value if the operator is prefix and an lvalue (in C++). 925591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (U->isGLValue()) 9269050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->BindExpr(U, LCtx, loc); 9279050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek else 9289050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->BindExpr(U, LCtx, U->isPostfix() ? V2 : Result); 9299050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9309050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Perform the store. 9319050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.takeNodes(*I); 9329050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Dst3; 933bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalStore(Dst3, U, U, *I, state, loc, Result); 9349050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.addNodes(Dst3); 935294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 9369050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Dst.insert(Dst2); 937294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 938