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(); 506bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines RightV = svalBuilder.conjureSymbolVal(nullptr, B->getRHS(), LCtx, 516bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines Count); 52294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 53d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Simulate the effects of a "store": bind the value of the RHS 54d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // to the L-Value represented by the LHS. 55591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks SVal ExprVal = B->isGLValue() ? LeftV : RightV; 565eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek evalStore(Tmp2, B, LHS, *it, state->BindExpr(B, LCtx, ExprVal), 575eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek LeftV, RightV); 58d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek continue; 59d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 60294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 61d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek if (!B->isAssignmentOp()) { 6266c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(*it, Tmp2, *currBldrCtx); 63e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks 64e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks if (B->isAdditiveOp()) { 65e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // If one of the operands is a location, conjure a symbol for the other 66e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // one (offset) if it's unknown so that memory arithmetic always 67e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // results in an ElementRegion. 68e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // TODO: This can be removed after we enable history tracking with 69e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks // SymSymExpr. 7066c486f275531df6362b3511fc3af6563561801bTed Kremenek unsigned Count = currBldrCtx->blockCount(); 715251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie if (LeftV.getAs<Loc>() && 72a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose RHS->getType()->isIntegralOrEnumerationType() && 73a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose RightV.isUnknown()) { 743b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek RightV = svalBuilder.conjureSymbolVal(RHS, LCtx, RHS->getType(), 753b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek Count); 76e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks } 775251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie if (RightV.getAs<Loc>() && 78a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose LHS->getType()->isIntegralOrEnumerationType() && 79a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose LeftV.isUnknown()) { 803b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek LeftV = svalBuilder.conjureSymbolVal(LHS, LCtx, LHS->getType(), 813b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek Count); 82e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks } 83e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks } 84e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks 856bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines // Although we don't yet model pointers-to-members, we do need to make 866bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines // sure that the members of temporaries have a valid 'this' pointer for 876bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines // other checks. 886bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines if (B->getOpcode() == BO_PtrMemD) 896bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines state = createTemporaryRegionIfNeeded(state, LCtx, LHS); 906bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines 91d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Process non-assignments except commas or short-circuited 92d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // logical expressions (LAnd and LOr). 93d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal Result = evalBinOp(state, Op, LeftV, RightV, B->getType()); 94d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek if (Result.isUnknown()) { 95ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(B, *it, state); 96294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 97d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 98d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 995eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, Result); 100ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(B, *it, state); 101d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek continue; 102d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 103294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 104d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek assert (B->isCompoundAssignmentOp()); 105d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 106d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek switch (Op) { 107d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek default: 108b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid opcode for compound assignment."); 109d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_MulAssign: Op = BO_Mul; break; 110d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_DivAssign: Op = BO_Div; break; 111d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_RemAssign: Op = BO_Rem; break; 112d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_AddAssign: Op = BO_Add; break; 113d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_SubAssign: Op = BO_Sub; break; 114d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_ShlAssign: Op = BO_Shl; break; 115d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_ShrAssign: Op = BO_Shr; break; 116d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_AndAssign: Op = BO_And; break; 117d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_XorAssign: Op = BO_Xor; break; 118d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_OrAssign: Op = BO_Or; break; 119d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 120294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 121d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Perform a load (the LHS). This performs the checks for 122d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // null dereferences, and so on. 123d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek ExplodedNodeSet Tmp; 124d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal location = LeftV; 125bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Tmp, B, LHS, *it, state, location); 126d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 127d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek for (ExplodedNodeSet::iterator I = Tmp.begin(), E = Tmp.end(); I != E; 128d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek ++I) { 129d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 130d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek state = (*I)->getState(); 1315eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = (*I)->getLocationContext(); 1325eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal V = state->getSVal(LHS, LCtx); 133294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 134d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Get the computation type. 135d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek QualType CTy = 136294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek cast<CompoundAssignOperator>(B)->getComputationResultType(); 137d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek CTy = getContext().getCanonicalType(CTy); 138d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 139d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek QualType CLHSTy = 140294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek cast<CompoundAssignOperator>(B)->getComputationLHSType(); 141d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek CLHSTy = getContext().getCanonicalType(CLHSTy); 142d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 143d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek QualType LTy = getContext().getCanonicalType(LHS->getType()); 144d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 145d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Promote LHS. 146d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek V = svalBuilder.evalCast(V, CLHSTy, LTy); 147d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 148d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Compute the result of the operation. 149d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal Result = svalBuilder.evalCast(evalBinOp(state, Op, V, RightV, CTy), 150d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek B->getType(), CTy); 151d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 152d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // EXPERIMENTAL: "Conjured" symbols. 153d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // FIXME: Handle structs. 154d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 155d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal LHSVal; 156d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 15776462f00854171d2aa3ebc34f9aac1c60021b0eaAnna Zaks if (Result.isUnknown()) { 158d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // The symbolic value is actually for the type of the left-hand side 159d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // expression, not the computation type, as this is the value the 160d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // LValue on the LHS will bind to. 1616bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines LHSVal = svalBuilder.conjureSymbolVal(nullptr, B->getRHS(), LCtx, LTy, 16266c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 163d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // However, we need to convert the symbol to the computation type. 164d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek Result = svalBuilder.evalCast(LHSVal, CTy, LTy); 165d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 166d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek else { 167d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // The left-hand side may bind to a different value then the 168d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // computation type. 169d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek LHSVal = svalBuilder.evalCast(Result, LTy, CTy); 170294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 171d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 172d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // In C++, assignment and compound assignment operators return an 173d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // lvalue. 174591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (B->isGLValue()) 1755eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, location); 176d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek else 1775eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, Result); 178d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 179d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek evalStore(Tmp2, B, LHS, *I, state, location, LHSVal); 180294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 181294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 182294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 183d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // FIXME: postvisits eventually go in ::Visit() 184d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek getCheckerManager().runCheckersForPostStmt(Dst, Tmp2, B, *this); 185294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 186294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 187294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitBlockExpr(const BlockExpr *BE, ExplodedNode *Pred, 188294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 189294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 190294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek CanQualType T = getContext().getCanonicalType(BE->getType()); 19185d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 19285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // Get the value of the block itself. 193294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal V = svalBuilder.getBlockPointer(BE->getBlockDecl(), T, 1943eb52bb5d791630f926ff2226dae25012315ad9aBill Wendling Pred->getLocationContext(), 1953eb52bb5d791630f926ff2226dae25012315ad9aBill Wendling currBldrCtx->blockCount()); 196294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 19785d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek ProgramStateRef State = Pred->getState(); 19885d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 19985d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // If we created a new MemRegion for the block, we should explicitly bind 20085d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // the captured variables. 20185d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek if (const BlockDataRegion *BDR = 20285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek dyn_cast_or_null<BlockDataRegion>(V.getAsRegion())) { 20385d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 20485d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek BlockDataRegion::referenced_vars_iterator I = BDR->referenced_vars_begin(), 20585d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek E = BDR->referenced_vars_end(); 20685d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 20785d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek for (; I != E; ++I) { 20885d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek const MemRegion *capturedR = I.getCapturedRegion(); 20985d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek const MemRegion *originalR = I.getOriginalRegion(); 21085d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek if (capturedR != originalR) { 21185d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek SVal originalV = State->getSVal(loc::MemRegionVal(originalR)); 21285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek State = State->bindLoc(loc::MemRegionVal(capturedR), originalV); 21385d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 21485d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 21585d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 21685d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 217294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet Tmp; 21866c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Pred, Tmp, *currBldrCtx); 2195eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek Bldr.generateNode(BE, Pred, 22085d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek State->BindExpr(BE, Pred->getLocationContext(), V), 2216bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines nullptr, ProgramPoint::PostLValueKind); 2226bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines 223294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: Move all post/pre visits to ::Visit(). 224294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPostStmt(Dst, Tmp, BE, *this); 225294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 226294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 227294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCast(const CastExpr *CastE, const Expr *Ex, 228294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, ExplodedNodeSet &Dst) { 229294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 230294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreStmt; 231294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreStmt, Pred, CastE, *this); 232294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 2337864435ef2bce200224120bd1df3aed98ea5b99aJohn McCall if (CastE->getCastKind() == CK_LValueToRValue) { 234294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end(); 235294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I!=E; ++I) { 236294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *subExprNode = *I; 2378bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = subExprNode->getState(); 2385eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = subExprNode->getLocationContext(); 239bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Dst, CastE, CastE, subExprNode, state, state->getSVal(Ex, LCtx)); 240294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 241294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 242294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 243294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 244294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // All other casts. 245294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = CastE->getType(); 246294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType ExTy = Ex->getType(); 247294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 248294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (const ExplicitCastExpr *ExCast=dyn_cast_or_null<ExplicitCastExpr>(CastE)) 249294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek T = ExCast->getTypeAsWritten(); 250294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 25166c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(dstPreStmt, Dst, *currBldrCtx); 252294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end(); 253294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I != E; ++I) { 254294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 255294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Pred = *I; 256c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose ProgramStateRef state = Pred->getState(); 257c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose const LocationContext *LCtx = Pred->getLocationContext(); 258c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose 259294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek switch (CastE->getCastKind()) { 260294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_LValueToRValue: 261b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("LValueToRValue casts handled earlier."); 262294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ToVoid: 263294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 264294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // The analyzer doesn't do anything special with these casts, 265294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // since it understands retain/release semantics already. 26633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 26733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 26833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 26933e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: // Fall-through. 270ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 2717a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // The analyser can ignore atomic casts for now, although some future 2727a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // checkers may want to make certain that you're not modifying the same 2737a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // value through atomic and nonatomic pointers. 2747a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 2757a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 276294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // True no-ops. 277294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_NoOp: 278c210cb7a358d14cdd93b58562f33ff5ed2d895c1Jordan Rose case CK_ConstructorConversion: 279c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose case CK_UserDefinedConversion: 280a6c66cedc022c9e5d45a937d6b8cff491a6bf81bEli Friedman case CK_FunctionToPointerDecay: 281a6c66cedc022c9e5d45a937d6b8cff491a6bf81bEli Friedman case CK_BuiltinFnToFnPtr: { 282294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Copy the SVal of Ex to CastE. 2838bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 2845eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 2855eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal V = state->getSVal(Ex, LCtx); 2865eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CastE, LCtx, V); 287ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 288294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 289294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 2900156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose case CK_MemberPointerToBoolean: 2910156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose // FIXME: For now, member pointers are represented by void *. 2920156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose // FALLTHROUGH 293294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_Dependent: 294294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ArrayToPointerDecay: 295294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BitCast: 296651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines case CK_AddressSpaceConversion: 297294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralCast: 298294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_NullToPointer: 299294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToPointer: 300294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_PointerToIntegral: 301294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_PointerToBoolean: 302294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToBoolean: 303294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToFloating: 304294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingToIntegral: 305294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingToBoolean: 306294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingCast: 307294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingRealToComplex: 308294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToReal: 309294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToBoolean: 310294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexCast: 311294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToIntegralComplex: 312294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralRealToComplex: 313294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToReal: 314294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToBoolean: 315294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexCast: 316294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToFloatingComplex: 3171d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 3181d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 319294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_AnyPointerToBlockPointerCast: 320e6b9d802fb7b16d93474c4f1c179ab36202e8a8bGuy Benyei case CK_ObjCObjectLValueCast: 3213056439bb175db8c46b89fb4385de8b3a8e42d0dAnna Zaks case CK_ZeroToOCLEvent: 3223056439bb175db8c46b89fb4385de8b3a8e42d0dAnna Zaks case CK_LValueBitCast: { 323294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Delegate to SValBuilder to process. 3245eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal V = state->getSVal(Ex, LCtx); 325294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek V = svalBuilder.evalCast(V, T, ExTy); 3265eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CastE, LCtx, V); 327ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 328294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 329294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 330294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_DerivedToBase: 331294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_UncheckedDerivedToBase: { 332294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // For DerivedToBase cast, delegate to the store manager. 3335eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal val = state->getSVal(Ex, LCtx); 3342c5f8d79ed128892fa548a3308a938a3a53fbb5eJordan Rose val = getStoreManager().evalDerivedToBase(val, CastE); 3355eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CastE, LCtx, val); 336ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 337294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 338294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 339e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Handle C++ dyn_cast. 340e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks case CK_Dynamic: { 341e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks SVal val = state->getSVal(Ex, LCtx); 342e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 343e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Compute the type of the result. 344e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks QualType resultType = CastE->getType(); 345591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (CastE->isGLValue()) 346e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks resultType = getContext().getPointerType(resultType); 347e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 348e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks bool Failed = false; 349e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 350e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Check if the value being cast evaluates to 0. 351e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (val.isZeroConstant()) 352e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks Failed = true; 353e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Else, evaluate the cast. 354e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks else 355e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks val = getStoreManager().evalDynamicCast(val, T, Failed); 356e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 357e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (Failed) { 358a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks if (T->isReferenceType()) { 359a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks // A bad_cast exception is thrown if input value is a reference. 360a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks // Currently, we model this, by generating a sink. 361fa06f0464a04bb7fce1fcfb3780d151bb029e00cJordan Rose Bldr.generateSink(CastE, Pred, state); 362a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks continue; 363a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks } else { 3647ea1c5639764aa3ebe124f4350c5f2b3be795667Anna Zaks // If the cast fails on a pointer, bind to 0. 3657ea1c5639764aa3ebe124f4350c5f2b3be795667Anna Zaks state = state->BindExpr(CastE, LCtx, svalBuilder.makeNull()); 366a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks } 367e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } else { 368e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // If we don't know if the cast succeeded, conjure a new symbol. 369e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (val.isUnknown()) { 3703b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek DefinedOrUnknownSVal NewSym = 3716bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines svalBuilder.conjureSymbolVal(nullptr, CastE, LCtx, resultType, 37266c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 373e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks state = state->BindExpr(CastE, LCtx, NewSym); 374e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } else 375e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Else, bind to the derived region value. 376e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks state = state->BindExpr(CastE, LCtx, val); 377e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } 378e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks Bldr.generateNode(CastE, Pred, state); 379e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks continue; 380e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } 3810156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose case CK_NullToMemberPointer: { 3820156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose // FIXME: For now, member pointers are represented by void *. 383330231537010ab1d77affcbcaffd4bbe358b4cfaJordan Rose SVal V = svalBuilder.makeNull(); 3840156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose state = state->BindExpr(CastE, LCtx, V); 3850156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose Bldr.generateNode(CastE, Pred, state); 3860156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose continue; 3870156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose } 388e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Various C++ casts that are not handled yet. 389294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ToUnion: 390294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BaseToDerived: 391294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BaseToDerivedMemberPointer: 392294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_DerivedToBaseMemberPointer: 3934d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 3943056439bb175db8c46b89fb4385de8b3a8e42d0dAnna Zaks case CK_VectorSplat: { 395294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Recover some path-sensitivty by conjuring a new value. 396294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType resultType = CastE->getType(); 397591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (CastE->isGLValue()) 398294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek resultType = getContext().getPointerType(resultType); 3996bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines SVal result = svalBuilder.conjureSymbolVal(nullptr, CastE, LCtx, 40066c486f275531df6362b3511fc3af6563561801bTed Kremenek resultType, 40166c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 402c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose state = state->BindExpr(CastE, LCtx, result); 403ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 404294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 405294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 406294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 407294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 408294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 409294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 410294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCompoundLiteralExpr(const CompoundLiteralExpr *CL, 411294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 412294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 41366c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 414d231d0130a95336610ab9a42eaeb2cdac19992f3Anna Zaks 4156376703eb3325fe41233aed234fde81164af42a1Jordan Rose ProgramStateRef State = Pred->getState(); 4166376703eb3325fe41233aed234fde81164af42a1Jordan Rose const LocationContext *LCtx = Pred->getLocationContext(); 4176376703eb3325fe41233aed234fde81164af42a1Jordan Rose 4186376703eb3325fe41233aed234fde81164af42a1Jordan Rose const Expr *Init = CL->getInitializer(); 4196376703eb3325fe41233aed234fde81164af42a1Jordan Rose SVal V = State->getSVal(CL->getInitializer(), LCtx); 420294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 4216376703eb3325fe41233aed234fde81164af42a1Jordan Rose if (isa<CXXConstructExpr>(Init)) { 4226376703eb3325fe41233aed234fde81164af42a1Jordan Rose // No work needed. Just pass the value up to this expression. 4236376703eb3325fe41233aed234fde81164af42a1Jordan Rose } else { 4246376703eb3325fe41233aed234fde81164af42a1Jordan Rose assert(isa<InitListExpr>(Init)); 4256376703eb3325fe41233aed234fde81164af42a1Jordan Rose Loc CLLoc = State->getLValue(CL, LCtx); 4266376703eb3325fe41233aed234fde81164af42a1Jordan Rose State = State->bindLoc(CLLoc, V); 4276376703eb3325fe41233aed234fde81164af42a1Jordan Rose 4286376703eb3325fe41233aed234fde81164af42a1Jordan Rose // Compound literal expressions are a GNU extension in C++. 4296376703eb3325fe41233aed234fde81164af42a1Jordan Rose // Unlike in C, where CLs are lvalues, in C++ CLs are prvalues, 4306376703eb3325fe41233aed234fde81164af42a1Jordan Rose // and like temporary objects created by the functional notation T() 4316376703eb3325fe41233aed234fde81164af42a1Jordan Rose // CLs are destroyed at the end of the containing full-expression. 4326376703eb3325fe41233aed234fde81164af42a1Jordan Rose // HOWEVER, an rvalue of array type is not something the analyzer can 4336376703eb3325fe41233aed234fde81164af42a1Jordan Rose // reason about, since we expect all regions to be wrapped in Locs. 4346376703eb3325fe41233aed234fde81164af42a1Jordan Rose // So we treat array CLs as lvalues as well, knowing that they will decay 4356376703eb3325fe41233aed234fde81164af42a1Jordan Rose // to pointers as soon as they are used. 4366376703eb3325fe41233aed234fde81164af42a1Jordan Rose if (CL->isGLValue() || CL->getType()->isArrayType()) 4376376703eb3325fe41233aed234fde81164af42a1Jordan Rose V = CLLoc; 4386376703eb3325fe41233aed234fde81164af42a1Jordan Rose } 439333e05f24717c79637e83806fd5142c752a86afaJordan Rose 4406376703eb3325fe41233aed234fde81164af42a1Jordan Rose B.generateNode(CL, Pred, State->BindExpr(CL, LCtx, V)); 441294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 442294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 443294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitDeclStmt(const DeclStmt *DS, ExplodedNode *Pred, 444294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 445294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Assumption: The CFG has one DeclStmt per Decl. 4468135886ab74d852a6702b1f5656a0b146abe210aAnna Zaks const VarDecl *VD = dyn_cast_or_null<VarDecl>(*DS->decl_begin()); 4472b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 4488135886ab74d852a6702b1f5656a0b146abe210aAnna Zaks if (!VD) { 449ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks //TODO:AZ: remove explicit insertion after refactoring is done. 450ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Dst.insert(Pred); 451294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 452ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks } 453294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 454294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: all pre/post visits should eventually be handled by ::Visit(). 455294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreVisit; 456294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, DS, *this); 457294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 458c07cad8364e7fb0e8cb0d5181edb7db718271b65Jordan Rose ExplodedNodeSet dstEvaluated; 459c07cad8364e7fb0e8cb0d5181edb7db718271b65Jordan Rose StmtNodeBuilder B(dstPreVisit, dstEvaluated, *currBldrCtx); 460294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreVisit.begin(), E = dstPreVisit.end(); 461294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I!=E; ++I) { 462294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *N = *I; 4638bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = N->getState(); 464294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const LocationContext *LC = N->getLocationContext(); 4652b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 4662b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks // Decls without InitExpr are not initialized explicitly. 467294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (const Expr *InitEx = VD->getInit()) { 4682b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 4692b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks // Note in the state that the initialization has occurred. 4702b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks ExplodedNode *UpdatedN = N; 471e460c46c5d602f65354cab0879c458890273591cJordan Rose SVal InitVal = state->getSVal(InitEx, LC); 472b98b998e9a5637012ab39ad1dabdad7c798721e8Ted Kremenek 473f08740ba5903d089a53cc315c19286e2189f9ff3Ted Kremenek if (isa<CXXConstructExpr>(InitEx->IgnoreImplicit())) { 47448b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // We constructed the object directly in the variable. 47548b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // No need to bind anything. 4762b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks B.generateNode(DS, UpdatedN, state); 47748b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } else { 47848b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // We bound the temp obj region to the CXXConstructExpr. Now recover 47948b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // the lazy compound value when the variable is not a reference. 4805251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie if (AMgr.getLangOpts().CPlusPlus && VD->getType()->isRecordType() && 4815251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie !VD->getType()->isReferenceType()) { 482dc84cd5efdd3430efb22546b4ac656aa0540b210David Blaikie if (Optional<loc::MemRegionVal> M = 4835251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie InitVal.getAs<loc::MemRegionVal>()) { 4845251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie InitVal = state->getSVal(M->getRegion()); 4855251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie assert(InitVal.getAs<nonloc::LazyCompoundVal>()); 4865251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie } 48748b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } 48848b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose 48948b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // Recover some path-sensitivity if a scalar value evaluated to 49048b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // UnknownVal. 49148b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose if (InitVal.isUnknown()) { 49248b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose QualType Ty = InitEx->getType(); 49348b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose if (InitEx->isGLValue()) { 49448b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose Ty = getContext().getPointerType(Ty); 49548b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } 49648b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose 4976bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines InitVal = svalBuilder.conjureSymbolVal(nullptr, InitEx, LC, Ty, 49866c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 49948b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } 5002b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 5012b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 5022b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks B.takeNodes(UpdatedN); 50348b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose ExplodedNodeSet Dst2; 5042b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks evalBind(Dst2, DS, UpdatedN, state->getLValue(VD, LC), InitVal, true); 50548b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose B.addNodes(Dst2); 506294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 507294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 508294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else { 50932a549a64922af0903bdb777613ae7ae4490b70fTed Kremenek B.generateNode(DS, N, state); 510294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 511294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 512c07cad8364e7fb0e8cb0d5181edb7db718271b65Jordan Rose 513c07cad8364e7fb0e8cb0d5181edb7db718271b65Jordan Rose getCheckerManager().runCheckersForPostStmt(Dst, B.getResults(), DS, *this); 514294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 515294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 516294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitLogicalExpr(const BinaryOperator* B, ExplodedNode *Pred, 517294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 518294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(B->getOpcode() == BO_LAnd || 519294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek B->getOpcode() == BO_LOr); 520ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks 52166c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx); 5228bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 5233f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek 524dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling ExplodedNode *N = Pred; 525dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling while (!N->getLocation().getAs<BlockEntrance>()) { 526dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling ProgramPoint P = N->getLocation(); 527dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling assert(P.getAs<PreStmt>()|| P.getAs<PreStmtPurgeDeadSymbols>()); 528dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling (void) P; 529dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling assert(N->pred_size() == 1); 530dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling N = *N->pred_begin(); 531dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling } 532dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling assert(N->pred_size() == 1); 533dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling N = *N->pred_begin(); 534dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling BlockEdge BE = N->getLocation().castAs<BlockEdge>(); 535dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling SVal X; 536dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling 537dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling // Determine the value of the expression by introspecting how we 538dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling // got this location in the CFG. This requires looking at the previous 539dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling // block we were in and what kind of control-flow transfer was involved. 540dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling const CFGBlock *SrcBlock = BE.getSrc(); 541dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling // The only terminator (if there is one) that makes sense is a logical op. 542dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling CFGTerminator T = SrcBlock->getTerminator(); 543dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling if (const BinaryOperator *Term = cast_or_null<BinaryOperator>(T.getStmt())) { 544dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling (void) Term; 545dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling assert(Term->isLogicalOp()); 546dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling assert(SrcBlock->succ_size() == 2); 547dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling // Did we take the true or false branch? 548dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling unsigned constant = (*SrcBlock->succ_begin() == BE.getDst()) ? 1 : 0; 549dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling X = svalBuilder.makeIntVal(constant, B->getType()); 550dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling } 551dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling else { 552dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling // If there is no terminator, by construction the last statement 553dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling // in SrcBlock is the value of the enclosing expression. 554dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling // However, we still need to constrain that value to be 0 or 1. 555dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling assert(!SrcBlock->empty()); 556dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling CFGStmt Elem = SrcBlock->rbegin()->castAs<CFGStmt>(); 557dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling const Expr *RHS = cast<Expr>(Elem.getStmt()); 558dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling SVal RHSVal = N->getState()->getSVal(RHS, Pred->getLocationContext()); 559dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling 560dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling if (RHSVal.isUndef()) { 561dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling X = RHSVal; 562707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek } else { 563dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling DefinedOrUnknownSVal DefinedRHS = RHSVal.castAs<DefinedOrUnknownSVal>(); 564dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling ProgramStateRef StTrue, StFalse; 565651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines std::tie(StTrue, StFalse) = N->getState()->assume(DefinedRHS); 566dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling if (StTrue) { 567dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling if (StFalse) { 568dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling // We can't constrain the value to 0 or 1. 569dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling // The best we can do is a cast. 570dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling X = getSValBuilder().evalCast(RHSVal, B->getType(), RHS->getType()); 571dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling } else { 572dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling // The value is known to be true. 573dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling X = getSValBuilder().makeIntVal(1, B->getType()); 574dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling } 575dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling } else { 576dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling // The value is known to be false. 577dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling assert(StFalse && "Infeasible path!"); 578dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling X = getSValBuilder().makeIntVal(0, B->getType()); 579dd9e9cec6f863afa15dd91b34fbf15c66c678c02Bill Wendling } 5807f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose } 581294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 5823f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek Bldr.generateNode(B, Pred, state->BindExpr(B, Pred->getLocationContext(), X)); 583294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 584294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 585294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitInitListExpr(const InitListExpr *IE, 586294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 587294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 58866c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 589294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 5908bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 5915eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 592294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = getContext().getCanonicalType(IE->getType()); 593294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek unsigned NumInitElements = IE->getNumInits(); 594bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks 595bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks if (!IE->isGLValue() && 596bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks (T->isArrayType() || T->isRecordType() || T->isVectorType() || 597bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks T->isAnyComplexType())) { 598294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek llvm::ImmutableList<SVal> vals = getBasicVals().getEmptySValList(); 599294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 600294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Handle base case where the initializer has no elements. 601294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // e.g: static int* myArray[] = {}; 602294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (NumInitElements == 0) { 603294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal V = svalBuilder.makeCompoundVal(T, vals); 6045eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, V)); 605294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 606294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 607294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 608294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (InitListExpr::const_reverse_iterator it = IE->rbegin(), 609294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ei = IE->rend(); it != ei; ++it) { 6101994e3993e5e2c606f4ab22563768af6f03dad30Ted Kremenek SVal V = state->getSVal(cast<Expr>(*it), LCtx); 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 620bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks // Handle scalars: int{5} and int{} and GLvalues. 621bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks // Note, if the InitListExpr is a GLvalue, it means that there is an address 622bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks // representing it, so it must have a single init element. 62389e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose assert(NumInitElements <= 1); 62489e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose 62589e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose SVal V; 62689e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose if (NumInitElements == 0) 62789e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose V = getSValBuilder().makeZeroVal(T); 62889e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose else 62989e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose V = state->getSVal(IE->getInit(0), LCtx); 63089e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose 63189e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, V)); 632294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 633294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 634294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitGuardedExpr(const Expr *Ex, 635294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *L, 636294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *R, 637294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 638294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 639d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks assert(L && R); 640d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks 64166c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 6428bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 6435eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 6446bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines const CFGBlock *SrcBlock = nullptr; 645469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek 646d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks // Find the predecessor block. 647d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks ProgramStateRef SrcState = state; 6486da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek for (const ExplodedNode *N = Pred ; N ; N = *N->pred_begin()) { 6496da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek ProgramPoint PP = N->getLocation(); 6507a95de68c093991047ed8d339479ccad51b88663David Blaikie if (PP.getAs<PreStmtPurgeDeadSymbols>() || PP.getAs<BlockEntrance>()) { 6516da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek assert(N->pred_size() == 1); 6526da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek continue; 6536da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek } 6547a95de68c093991047ed8d339479ccad51b88663David Blaikie SrcBlock = PP.castAs<BlockEdge>().getSrc(); 655d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks SrcState = N->getState(); 6566da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek break; 6576da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek } 6586da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek 65941f3f3a4792f46787632fdb94f952f6b3ce3f4aeJordan Rose assert(SrcBlock && "missing function entry"); 66041f3f3a4792f46787632fdb94f952f6b3ce3f4aeJordan Rose 6616da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek // Find the last expression in the predecessor block. That is the 6626da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek // expression that is used for the value of the ternary expression. 6636da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek bool hasValue = false; 664469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek SVal V; 6656da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek 6666da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek for (CFGBlock::const_reverse_iterator I = SrcBlock->rbegin(), 6676da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek E = SrcBlock->rend(); I != E; ++I) { 6686da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek CFGElement CE = *I; 669b07805485c603be3d8011f72611465324c9e664bDavid Blaikie if (Optional<CFGStmt> CS = CE.getAs<CFGStmt>()) { 670b07805485c603be3d8011f72611465324c9e664bDavid Blaikie const Expr *ValEx = cast<Expr>(CS->getStmt()); 671d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks ValEx = ValEx->IgnoreParens(); 672d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks 673d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks // For GNU extension '?:' operator, the left hand side will be an 674d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks // OpaqueValueExpr, so get the underlying expression. 675d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks if (const OpaqueValueExpr *OpaqueEx = dyn_cast<OpaqueValueExpr>(L)) 676d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks L = OpaqueEx->getSourceExpr(); 677d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks 678d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks // If the last expression in the predecessor block matches true or false 679d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks // subexpression, get its the value. 680d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks if (ValEx == L->IgnoreParens() || ValEx == R->IgnoreParens()) { 681d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks hasValue = true; 682d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks V = SrcState->getSVal(ValEx, LCtx); 683d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks } 684469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek break; 685469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek } 686469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek } 6876da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek 688d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks if (!hasValue) 6896bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines V = svalBuilder.conjureSymbolVal(nullptr, Ex, LCtx, 6906bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines currBldrCtx->blockCount()); 691469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek 692469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek // Generate a new node with the binding from the appropriate path. 693469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek B.generateNode(Ex, Pred, state->BindExpr(Ex, LCtx, V, true)); 694294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 695294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 696294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine:: 697294fd0a62b95f512637910bf85c7efa6c2354b50Ted KremenekVisitOffsetOfExpr(const OffsetOfExpr *OOE, 698294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, ExplodedNodeSet &Dst) { 69966c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 70080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APSInt IV; 70180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (OOE->EvaluateAsInt(IV, getContext())) { 702294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(IV.getBitWidth() == getContext().getTypeSize(OOE->getType())); 703a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose assert(OOE->getType()->isBuiltinType()); 704a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose assert(OOE->getType()->getAs<BuiltinType>()->isInteger()); 705a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose assert(IV.isSigned() == OOE->getType()->isSignedIntegerType()); 706294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal X = svalBuilder.makeIntVal(IV); 7075eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(OOE, Pred, 7085eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek Pred->getState()->BindExpr(OOE, Pred->getLocationContext(), 7095eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek X)); 710294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 711294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: Handle the case where __builtin_offsetof is not a constant. 712294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 713294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 714294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 715294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine:: 716294fd0a62b95f512637910bf85c7efa6c2354b50Ted KremenekVisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *Ex, 717294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 718294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 719651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines // FIXME: Prechecks eventually go in ::Visit(). 720651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines ExplodedNodeSet CheckedSet; 721651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines getCheckerManager().runCheckersForPreStmt(CheckedSet, Pred, Ex, *this); 722651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines 723651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines ExplodedNodeSet EvalSet; 724651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines StmtNodeBuilder Bldr(CheckedSet, EvalSet, *currBldrCtx); 725294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 726294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = Ex->getTypeOfArgument(); 727651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines 728651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines for (ExplodedNodeSet::iterator I = CheckedSet.begin(), E = CheckedSet.end(); 729651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines I != E; ++I) { 730651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines if (Ex->getKind() == UETT_SizeOf) { 731651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines if (!T->isIncompleteType() && !T->isConstantSizeType()) { 732651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines assert(T->isVariableArrayType() && "Unknown non-constant-sized type."); 733651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines 734651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines // FIXME: Add support for VLA type arguments and VLA expressions. 735651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines // When that happens, we should probably refactor VLASizeChecker's code. 736651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines continue; 737651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines } else if (T->getAs<ObjCObjectType>()) { 738651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines // Some code tries to take the sizeof an ObjCObjectType, relying that 739651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines // the compiler has laid out its representation. Just report Unknown 740651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines // for these. 741651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines continue; 742651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines } 743294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 744651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines 745651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines APSInt Value = Ex->EvaluateKnownConstInt(getContext()); 746651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines CharUnits amt = CharUnits::fromQuantity(Value.getZExtValue()); 747651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines 748651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines ProgramStateRef state = (*I)->getState(); 749651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines state = state->BindExpr(Ex, (*I)->getLocationContext(), 750651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines svalBuilder.makeIntVal(amt.getQuantity(), 751651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines Ex->getType())); 752651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines Bldr.generateNode(Ex, *I, state); 753294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 754651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines 755651f13cea278ec967336033dd032faef0e9fc2ecStephen Hines getCheckerManager().runCheckersForPostStmt(Dst, EvalSet, Ex, *this); 756294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 757294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 758294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitUnaryOperator(const UnaryOperator* U, 759294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 7608ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNodeSet &Dst) { 761d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose // FIXME: Prechecks eventually go in ::Visit(). 762d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose ExplodedNodeSet CheckedSet; 763d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose getCheckerManager().runCheckersForPreStmt(CheckedSet, Pred, U, *this); 764d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose 765d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose ExplodedNodeSet EvalSet; 766d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose StmtNodeBuilder Bldr(CheckedSet, EvalSet, *currBldrCtx); 767d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose 768d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose for (ExplodedNodeSet::iterator I = CheckedSet.begin(), E = CheckedSet.end(); 769d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose I != E; ++I) { 770d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose switch (U->getOpcode()) { 771ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks default: { 772d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose Bldr.takeNodes(*I); 773ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks ExplodedNodeSet Tmp; 774d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose VisitIncrementDecrementOperator(U, *I, Tmp); 775ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.addNodes(Tmp); 776294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek break; 777d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose } 778294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Real: { 779294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 780294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 781019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // FIXME: We don't have complex SValues yet. 782019316636b0a2d2273b945a98e52d454acee66efTed Kremenek if (Ex->getType()->isAnyComplexType()) { 783019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // Just report "Unknown." 784019316636b0a2d2273b945a98e52d454acee66efTed Kremenek break; 785019316636b0a2d2273b945a98e52d454acee66efTed Kremenek } 786294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 787019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // For all other types, UO_Real is an identity operation. 788019316636b0a2d2273b945a98e52d454acee66efTed Kremenek assert (U->getType() == Ex->getType()); 789d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose ProgramStateRef state = (*I)->getState(); 790d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose const LocationContext *LCtx = (*I)->getLocationContext(); 791d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, 792d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose state->getSVal(Ex, LCtx))); 7938ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 794294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 795294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 796c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek case UO_Imag: { 797294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 798c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // FIXME: We don't have complex SValues yet. 799c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek if (Ex->getType()->isAnyComplexType()) { 800c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // Just report "Unknown." 801c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek break; 802294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 803c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // For all other types, UO_Imag returns 0. 804d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose ProgramStateRef state = (*I)->getState(); 805d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose const LocationContext *LCtx = (*I)->getLocationContext(); 806c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek SVal X = svalBuilder.makeZeroVal(Ex->getType()); 807d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, X)); 8088ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 809294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 810294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 811294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Plus: 812591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks assert(!U->isGLValue()); 813294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FALL-THROUGH. 814294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Deref: 815294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_AddrOf: 816294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Extension: { 817224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // FIXME: We can probably just have some magic in Environment::getSVal() 818224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // that propagates values, instead of creating a new node here. 819224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // 820294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Unary "+" is a no-op, similar to a parentheses. We still have places 821294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // where it may be a block-level expression, so we need to 822294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // generate an extra node that just propagates the value of the 823224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // subexpression. 824294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 825d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose ProgramStateRef state = (*I)->getState(); 826d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose const LocationContext *LCtx = (*I)->getLocationContext(); 827d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, 828d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose state->getSVal(Ex, LCtx))); 8298ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 830294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 831294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 832294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_LNot: 833294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Minus: 834294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Not: { 835591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks assert (!U->isGLValue()); 836294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 837d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose ProgramStateRef state = (*I)->getState(); 838d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose const LocationContext *LCtx = (*I)->getLocationContext(); 839294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 840a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // Get the value of the subexpression. 841a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek SVal V = state->getSVal(Ex, LCtx); 842294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 843a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek if (V.isUnknownOrUndef()) { 844d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, V)); 845a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 846a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 847294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 848a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek switch (U->getOpcode()) { 849a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek default: 850a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek llvm_unreachable("Invalid Opcode."); 851a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_Not: 852a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // FIXME: Do we need to handle promotions? 8535251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie state = state->BindExpr(U, LCtx, evalComplement(V.castAs<NonLoc>())); 854a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 855a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_Minus: 856a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // FIXME: Do we need to handle promotions? 8575251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie state = state->BindExpr(U, LCtx, evalMinus(V.castAs<NonLoc>())); 858a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 859a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_LNot: 860a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // C99 6.5.3.3: "The expression !E is equivalent to (0==E)." 861a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // 862a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // Note: technically we do "E == 0", but this is the same in the 863a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // transfer functions as "0 == E". 864a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek SVal Result; 865dc84cd5efdd3430efb22546b4ac656aa0540b210David Blaikie if (Optional<Loc> LV = V.getAs<Loc>()) { 866a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Loc X = svalBuilder.makeNull(); 8675251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie Result = evalBinOp(state, BO_EQ, *LV, X, U->getType()); 868a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 8699195caf28f2a5dcef1e299bf3e5232a018ca1c68Ted Kremenek else if (Ex->getType()->isFloatingType()) { 8709195caf28f2a5dcef1e299bf3e5232a018ca1c68Ted Kremenek // FIXME: handle floating point types. 8719195caf28f2a5dcef1e299bf3e5232a018ca1c68Ted Kremenek Result = UnknownVal(); 8729195caf28f2a5dcef1e299bf3e5232a018ca1c68Ted Kremenek } else { 873a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek nonloc::ConcreteInt X(getBasicVals().getValue(0, Ex->getType())); 8745251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie Result = evalBinOp(state, BO_EQ, V.castAs<NonLoc>(), X, 875a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek U->getType()); 876a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 877a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek 878a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek state = state->BindExpr(U, LCtx, Result); 879a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 880294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 881d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose Bldr.generateNode(U, *I, state); 8828ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 883294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 884d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose } 885294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 8868ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks 887d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose getCheckerManager().runCheckersForPostStmt(Dst, EvalSet, U, *this); 8888ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks} 8898ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks 8908ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaksvoid ExprEngine::VisitIncrementDecrementOperator(const UnaryOperator* U, 8918ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNode *Pred, 8928ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNodeSet &Dst) { 893294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Handle ++ and -- (both pre- and post-increment). 894294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert (U->isIncrementDecrementOp()); 895294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 896294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8979050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 8989050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ProgramStateRef state = Pred->getState(); 8999050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal loc = state->getSVal(Ex, LCtx); 9009050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9019050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Perform a load. 9029050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Tmp; 903bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Tmp, U, Ex, Pred, state, loc); 9049050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9059050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Dst2; 90666c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Tmp, Dst2, *currBldrCtx); 9079050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek for (ExplodedNodeSet::iterator I=Tmp.begin(), E=Tmp.end();I!=E;++I) { 908294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 9099050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = (*I)->getState(); 9109050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek assert(LCtx == (*I)->getLocationContext()); 9119050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal V2_untested = state->getSVal(Ex, LCtx); 912294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 9139050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Propagate unknown and undefined values. 9149050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (V2_untested.isUnknownOrUndef()) { 9159050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, V2_untested)); 9169050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek continue; 9179050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek } 9185251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie DefinedSVal V2 = V2_untested.castAs<DefinedSVal>(); 9199050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9209050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Handle all other values. 9219050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek BinaryOperator::Opcode Op = U->isIncrementOp() ? BO_Add : BO_Sub; 9229050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9239050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // If the UnaryOperator has non-location type, use its type to create the 9249050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // constant value. If the UnaryOperator has location type, create the 9259050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // constant with int type and pointer width. 9269050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal RHS; 9279050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9289050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (U->getType()->isAnyPointerType()) 9299050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek RHS = svalBuilder.makeArrayIndex(1); 930d04713598ee8af6e01b925dca4e38bfd78227dadJordan Rose else if (U->getType()->isIntegralOrEnumerationType()) 9319050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek RHS = svalBuilder.makeIntVal(1, U->getType()); 932d04713598ee8af6e01b925dca4e38bfd78227dadJordan Rose else 933d04713598ee8af6e01b925dca4e38bfd78227dadJordan Rose RHS = UnknownVal(); 9349050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9359050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal Result = evalBinOp(state, Op, V2, RHS, U->getType()); 9369050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9379050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Conjure a new symbol if necessary to recover precision. 9389050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (Result.isUnknown()){ 9399050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek DefinedOrUnknownSVal SymVal = 9406bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines svalBuilder.conjureSymbolVal(nullptr, Ex, LCtx, 9416bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines currBldrCtx->blockCount()); 9429050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Result = SymVal; 943294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 9449050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // If the value is a location, ++/-- should always preserve 9459050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // non-nullness. Check if the original value was non-null, and if so 9469050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // propagate that constraint. 9479050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (Loc::isLocType(U->getType())) { 9489050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek DefinedOrUnknownSVal Constraint = 9499050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek svalBuilder.evalEQ(state, V2,svalBuilder.makeZeroVal(U->getType())); 950294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 9519050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (!state->assume(Constraint, true)) { 9529050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // It isn't feasible for the original value to be null. 9539050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Propagate this constraint. 9549050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Constraint = svalBuilder.evalEQ(state, SymVal, 9559050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek svalBuilder.makeZeroVal(U->getType())); 956294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 9579050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9589050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->assume(Constraint, false); 9599050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek assert(state); 960294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 961294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 962294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 9639050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9649050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Since the lvalue-to-rvalue conversion is explicit in the AST, 9659050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // we bind an l-value if the operator is prefix and an lvalue (in C++). 966591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (U->isGLValue()) 9679050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->BindExpr(U, LCtx, loc); 9689050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek else 9699050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->BindExpr(U, LCtx, U->isPostfix() ? V2 : Result); 9709050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9719050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Perform the store. 9729050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.takeNodes(*I); 9739050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Dst3; 974bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalStore(Dst3, U, U, *I, state, loc, Result); 9759050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.addNodes(Dst3); 976294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 9779050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Dst.insert(Dst2); 978294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 979