ExprEngineC.cpp revision d7c47d94a55a03aeea14d411768e5593f50445da
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(); 705251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie if (LeftV.getAs<Loc>() && 71a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose RHS->getType()->isIntegralOrEnumerationType() && 72a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose RightV.isUnknown()) { 733b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek RightV = svalBuilder.conjureSymbolVal(RHS, LCtx, RHS->getType(), 743b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek Count); 75e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks } 765251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie if (RightV.getAs<Loc>() && 77a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose LHS->getType()->isIntegralOrEnumerationType() && 78a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose LeftV.isUnknown()) { 793b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek LeftV = svalBuilder.conjureSymbolVal(LHS, LCtx, LHS->getType(), 803b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek Count); 81e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks } 82e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks } 83e55a14a025c38800d07f1ab0db7dbbe4a2fe1605Anna Zaks 84d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Process non-assignments except commas or short-circuited 85d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // logical expressions (LAnd and LOr). 86d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal Result = evalBinOp(state, Op, LeftV, RightV, B->getType()); 87d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek if (Result.isUnknown()) { 88ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(B, *it, state); 89294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 90d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 91d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 925eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, Result); 93ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(B, *it, state); 94d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek continue; 95d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 96294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 97d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek assert (B->isCompoundAssignmentOp()); 98d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 99d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek switch (Op) { 100d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek default: 101b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid opcode for compound assignment."); 102d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_MulAssign: Op = BO_Mul; break; 103d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_DivAssign: Op = BO_Div; break; 104d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_RemAssign: Op = BO_Rem; break; 105d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_AddAssign: Op = BO_Add; break; 106d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_SubAssign: Op = BO_Sub; break; 107d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_ShlAssign: Op = BO_Shl; break; 108d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_ShrAssign: Op = BO_Shr; break; 109d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_AndAssign: Op = BO_And; break; 110d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_XorAssign: Op = BO_Xor; break; 111d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek case BO_OrAssign: Op = BO_Or; break; 112d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 113294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 114d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Perform a load (the LHS). This performs the checks for 115d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // null dereferences, and so on. 116d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek ExplodedNodeSet Tmp; 117d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal location = LeftV; 118bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Tmp, B, LHS, *it, state, location); 119d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 120d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek for (ExplodedNodeSet::iterator I = Tmp.begin(), E = Tmp.end(); I != E; 121d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek ++I) { 122d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 123d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek state = (*I)->getState(); 1245eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = (*I)->getLocationContext(); 1255eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal V = state->getSVal(LHS, LCtx); 126294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 127d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Get the computation type. 128d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek QualType CTy = 129294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek cast<CompoundAssignOperator>(B)->getComputationResultType(); 130d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek CTy = getContext().getCanonicalType(CTy); 131d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 132d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek QualType CLHSTy = 133294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek cast<CompoundAssignOperator>(B)->getComputationLHSType(); 134d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek CLHSTy = getContext().getCanonicalType(CLHSTy); 135d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 136d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek QualType LTy = getContext().getCanonicalType(LHS->getType()); 137d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 138d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Promote LHS. 139d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek V = svalBuilder.evalCast(V, CLHSTy, LTy); 140d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 141d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // Compute the result of the operation. 142d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal Result = svalBuilder.evalCast(evalBinOp(state, Op, V, RightV, CTy), 143d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek B->getType(), CTy); 144d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 145d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // EXPERIMENTAL: "Conjured" symbols. 146d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // FIXME: Handle structs. 147d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 148d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek SVal LHSVal; 149d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 15076462f00854171d2aa3ebc34f9aac1c60021b0eaAnna Zaks if (Result.isUnknown()) { 151d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // The symbolic value is actually for the type of the left-hand side 152d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // expression, not the computation type, as this is the value the 153d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // LValue on the LHS will bind to. 15466c486f275531df6362b3511fc3af6563561801bTed Kremenek LHSVal = svalBuilder.conjureSymbolVal(0, B->getRHS(), LCtx, LTy, 15566c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 156d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // However, we need to convert the symbol to the computation type. 157d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek Result = svalBuilder.evalCast(LHSVal, CTy, LTy); 158d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek } 159d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek else { 160d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // The left-hand side may bind to a different value then the 161d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // computation type. 162d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek LHSVal = svalBuilder.evalCast(Result, LTy, CTy); 163294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 164d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 165d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // In C++, assignment and compound assignment operators return an 166d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // lvalue. 167591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (B->isGLValue()) 1685eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, location); 169d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek else 1705eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(B, LCtx, Result); 171d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek 172d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek evalStore(Tmp2, B, LHS, *I, state, location, LHSVal); 173294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 174294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 175294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 176d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek // FIXME: postvisits eventually go in ::Visit() 177d203c026c6f836e79abfbf2171ac4ba30e52db76Ted Kremenek getCheckerManager().runCheckersForPostStmt(Dst, Tmp2, B, *this); 178294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 179294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 180294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitBlockExpr(const BlockExpr *BE, ExplodedNode *Pred, 181294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 182294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 183294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek CanQualType T = getContext().getCanonicalType(BE->getType()); 18485d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 18585d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // Get the value of the block itself. 186294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal V = svalBuilder.getBlockPointer(BE->getBlockDecl(), T, 187294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Pred->getLocationContext()); 188294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 18985d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek ProgramStateRef State = Pred->getState(); 19085d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 19185d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // If we created a new MemRegion for the block, we should explicitly bind 19285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek // the captured variables. 19385d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek if (const BlockDataRegion *BDR = 19485d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek dyn_cast_or_null<BlockDataRegion>(V.getAsRegion())) { 19585d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 19685d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek BlockDataRegion::referenced_vars_iterator I = BDR->referenced_vars_begin(), 19785d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek E = BDR->referenced_vars_end(); 19885d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 19985d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek for (; I != E; ++I) { 20085d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek const MemRegion *capturedR = I.getCapturedRegion(); 20185d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek const MemRegion *originalR = I.getOriginalRegion(); 20285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek if (capturedR != originalR) { 20385d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek SVal originalV = State->getSVal(loc::MemRegionVal(originalR)); 20485d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek State = State->bindLoc(loc::MemRegionVal(capturedR), originalV); 20585d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 20685d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 20785d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek } 20885d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek 209294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet Tmp; 21066c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Pred, Tmp, *currBldrCtx); 2115eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek Bldr.generateNode(BE, Pred, 21285d87df66a50a15a1957f7213802000b451a8ec9Ted Kremenek State->BindExpr(BE, Pred->getLocationContext(), V), 213fa06f0464a04bb7fce1fcfb3780d151bb029e00cJordan Rose 0, ProgramPoint::PostLValueKind); 214294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 215294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: Move all post/pre visits to ::Visit(). 216294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPostStmt(Dst, Tmp, BE, *this); 217294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 218294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 219294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCast(const CastExpr *CastE, const Expr *Ex, 220294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, ExplodedNodeSet &Dst) { 221294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 222294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreStmt; 223294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreStmt, Pred, CastE, *this); 224294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 2257864435ef2bce200224120bd1df3aed98ea5b99aJohn McCall if (CastE->getCastKind() == CK_LValueToRValue) { 226294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end(); 227294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I!=E; ++I) { 228294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *subExprNode = *I; 2298bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = subExprNode->getState(); 2305eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = subExprNode->getLocationContext(); 231bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Dst, CastE, CastE, subExprNode, state, state->getSVal(Ex, LCtx)); 232294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 233294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 234294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 235294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 236294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // All other casts. 237294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = CastE->getType(); 238294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType ExTy = Ex->getType(); 239294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 240294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (const ExplicitCastExpr *ExCast=dyn_cast_or_null<ExplicitCastExpr>(CastE)) 241294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek T = ExCast->getTypeAsWritten(); 242294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 24366c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(dstPreStmt, Dst, *currBldrCtx); 244294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end(); 245294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I != E; ++I) { 246294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 247294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek Pred = *I; 248c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose ProgramStateRef state = Pred->getState(); 249c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose const LocationContext *LCtx = Pred->getLocationContext(); 250c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose 251294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek switch (CastE->getCastKind()) { 252294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_LValueToRValue: 253b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("LValueToRValue casts handled earlier."); 254294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ToVoid: 255294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 256294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // The analyzer doesn't do anything special with these casts, 257294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // since it understands retain/release semantics already. 25833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 25933e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 26033e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 26133e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: // Fall-through. 262ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 2637a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // The analyser can ignore atomic casts for now, although some future 2647a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // checkers may want to make certain that you're not modifying the same 2657a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall // value through atomic and nonatomic pointers. 2667a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 2677a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 268294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // True no-ops. 269294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_NoOp: 270c210cb7a358d14cdd93b58562f33ff5ed2d895c1Jordan Rose case CK_ConstructorConversion: 271c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose case CK_UserDefinedConversion: 272a6c66cedc022c9e5d45a937d6b8cff491a6bf81bEli Friedman case CK_FunctionToPointerDecay: 273a6c66cedc022c9e5d45a937d6b8cff491a6bf81bEli Friedman case CK_BuiltinFnToFnPtr: { 274294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Copy the SVal of Ex to CastE. 2758bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 2765eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 2775eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal V = state->getSVal(Ex, LCtx); 2785eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CastE, LCtx, V); 279ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 280294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 281294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 2820156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose case CK_MemberPointerToBoolean: 2830156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose // FIXME: For now, member pointers are represented by void *. 2840156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose // FALLTHROUGH 285294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_Dependent: 286294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ArrayToPointerDecay: 287294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BitCast: 288294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralCast: 289294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_NullToPointer: 290294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToPointer: 291294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_PointerToIntegral: 292294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_PointerToBoolean: 293294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToBoolean: 294294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralToFloating: 295294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingToIntegral: 296294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingToBoolean: 297294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingCast: 298294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingRealToComplex: 299294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToReal: 300294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToBoolean: 301294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexCast: 302294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_FloatingComplexToIntegralComplex: 303294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralRealToComplex: 304294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToReal: 305294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToBoolean: 306294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexCast: 307294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_IntegralComplexToFloatingComplex: 3081d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 3091d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 310294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_AnyPointerToBlockPointerCast: 311e6b9d802fb7b16d93474c4f1c179ab36202e8a8bGuy Benyei case CK_ObjCObjectLValueCast: 3123056439bb175db8c46b89fb4385de8b3a8e42d0dAnna Zaks case CK_ZeroToOCLEvent: 3133056439bb175db8c46b89fb4385de8b3a8e42d0dAnna Zaks case CK_LValueBitCast: { 314294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Delegate to SValBuilder to process. 3155eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal V = state->getSVal(Ex, LCtx); 316294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek V = svalBuilder.evalCast(V, T, ExTy); 3175eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CastE, LCtx, V); 318ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 319294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 320294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 321294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_DerivedToBase: 322294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_UncheckedDerivedToBase: { 323294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // For DerivedToBase cast, delegate to the store manager. 3245eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal val = state->getSVal(Ex, LCtx); 3252c5f8d79ed128892fa548a3308a938a3a53fbb5eJordan Rose val = getStoreManager().evalDerivedToBase(val, CastE); 3265eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CastE, LCtx, val); 327ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 328294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 329294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 330e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Handle C++ dyn_cast. 331e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks case CK_Dynamic: { 332e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks SVal val = state->getSVal(Ex, LCtx); 333e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 334e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Compute the type of the result. 335e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks QualType resultType = CastE->getType(); 336591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (CastE->isGLValue()) 337e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks resultType = getContext().getPointerType(resultType); 338e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 339e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks bool Failed = false; 340e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 341e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Check if the value being cast evaluates to 0. 342e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (val.isZeroConstant()) 343e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks Failed = true; 344e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Else, evaluate the cast. 345e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks else 346e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks val = getStoreManager().evalDynamicCast(val, T, Failed); 347e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks 348e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (Failed) { 349a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks if (T->isReferenceType()) { 350a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks // A bad_cast exception is thrown if input value is a reference. 351a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks // Currently, we model this, by generating a sink. 352fa06f0464a04bb7fce1fcfb3780d151bb029e00cJordan Rose Bldr.generateSink(CastE, Pred, state); 353a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks continue; 354a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks } else { 3557ea1c5639764aa3ebe124f4350c5f2b3be795667Anna Zaks // If the cast fails on a pointer, bind to 0. 3567ea1c5639764aa3ebe124f4350c5f2b3be795667Anna Zaks state = state->BindExpr(CastE, LCtx, svalBuilder.makeNull()); 357a2c8d2edfff1573450c6feba876830dd746ffaadAnna Zaks } 358e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } else { 359e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // If we don't know if the cast succeeded, conjure a new symbol. 360e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks if (val.isUnknown()) { 3613b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek DefinedOrUnknownSVal NewSym = 3623b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek svalBuilder.conjureSymbolVal(0, CastE, LCtx, resultType, 36366c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 364e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks state = state->BindExpr(CastE, LCtx, NewSym); 365e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } else 366e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Else, bind to the derived region value. 367e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks state = state->BindExpr(CastE, LCtx, val); 368e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } 369e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks Bldr.generateNode(CastE, Pred, state); 370e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks continue; 371e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks } 3720156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose case CK_NullToMemberPointer: { 3730156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose // FIXME: For now, member pointers are represented by void *. 374330231537010ab1d77affcbcaffd4bbe358b4cfaJordan Rose SVal V = svalBuilder.makeNull(); 3750156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose state = state->BindExpr(CastE, LCtx, V); 3760156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose Bldr.generateNode(CastE, Pred, state); 3770156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose continue; 3780156439a3d718ea0ef5922c38d189a60829c8a86Jordan Rose } 379e19f86edab8fb3c2c1e99e0e9815b6058504df9bAnna Zaks // Various C++ casts that are not handled yet. 380294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_ToUnion: 381294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BaseToDerived: 382294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_BaseToDerivedMemberPointer: 383294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case CK_DerivedToBaseMemberPointer: 3844d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 3853056439bb175db8c46b89fb4385de8b3a8e42d0dAnna Zaks case CK_VectorSplat: { 386294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Recover some path-sensitivty by conjuring a new value. 387294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType resultType = CastE->getType(); 388591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (CastE->isGLValue()) 389294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek resultType = getContext().getPointerType(resultType); 3903b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek SVal result = svalBuilder.conjureSymbolVal(0, CastE, LCtx, 39166c486f275531df6362b3511fc3af6563561801bTed Kremenek resultType, 39266c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 393c386d8f148c1a9d4992c64188e2873fcbc6da20dJordan Rose state = state->BindExpr(CastE, LCtx, result); 394ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CastE, Pred, state); 395294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek continue; 396294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 397294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 398294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 399294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 400294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 401294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCompoundLiteralExpr(const CompoundLiteralExpr *CL, 402294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 403294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 40466c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 405d231d0130a95336610ab9a42eaeb2cdac19992f3Anna Zaks 4066376703eb3325fe41233aed234fde81164af42a1Jordan Rose ProgramStateRef State = Pred->getState(); 4076376703eb3325fe41233aed234fde81164af42a1Jordan Rose const LocationContext *LCtx = Pred->getLocationContext(); 4086376703eb3325fe41233aed234fde81164af42a1Jordan Rose 4096376703eb3325fe41233aed234fde81164af42a1Jordan Rose const Expr *Init = CL->getInitializer(); 4106376703eb3325fe41233aed234fde81164af42a1Jordan Rose SVal V = State->getSVal(CL->getInitializer(), LCtx); 411294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 4126376703eb3325fe41233aed234fde81164af42a1Jordan Rose if (isa<CXXConstructExpr>(Init)) { 4136376703eb3325fe41233aed234fde81164af42a1Jordan Rose // No work needed. Just pass the value up to this expression. 4146376703eb3325fe41233aed234fde81164af42a1Jordan Rose } else { 4156376703eb3325fe41233aed234fde81164af42a1Jordan Rose assert(isa<InitListExpr>(Init)); 4166376703eb3325fe41233aed234fde81164af42a1Jordan Rose Loc CLLoc = State->getLValue(CL, LCtx); 4176376703eb3325fe41233aed234fde81164af42a1Jordan Rose State = State->bindLoc(CLLoc, V); 4186376703eb3325fe41233aed234fde81164af42a1Jordan Rose 4196376703eb3325fe41233aed234fde81164af42a1Jordan Rose // Compound literal expressions are a GNU extension in C++. 4206376703eb3325fe41233aed234fde81164af42a1Jordan Rose // Unlike in C, where CLs are lvalues, in C++ CLs are prvalues, 4216376703eb3325fe41233aed234fde81164af42a1Jordan Rose // and like temporary objects created by the functional notation T() 4226376703eb3325fe41233aed234fde81164af42a1Jordan Rose // CLs are destroyed at the end of the containing full-expression. 4236376703eb3325fe41233aed234fde81164af42a1Jordan Rose // HOWEVER, an rvalue of array type is not something the analyzer can 4246376703eb3325fe41233aed234fde81164af42a1Jordan Rose // reason about, since we expect all regions to be wrapped in Locs. 4256376703eb3325fe41233aed234fde81164af42a1Jordan Rose // So we treat array CLs as lvalues as well, knowing that they will decay 4266376703eb3325fe41233aed234fde81164af42a1Jordan Rose // to pointers as soon as they are used. 4276376703eb3325fe41233aed234fde81164af42a1Jordan Rose if (CL->isGLValue() || CL->getType()->isArrayType()) 4286376703eb3325fe41233aed234fde81164af42a1Jordan Rose V = CLLoc; 4296376703eb3325fe41233aed234fde81164af42a1Jordan Rose } 430333e05f24717c79637e83806fd5142c752a86afaJordan Rose 4316376703eb3325fe41233aed234fde81164af42a1Jordan Rose B.generateNode(CL, Pred, State->BindExpr(CL, LCtx, V)); 432294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 433294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 434294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitDeclStmt(const DeclStmt *DS, ExplodedNode *Pred, 435294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 436294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Assumption: The CFG has one DeclStmt per Decl. 4378135886ab74d852a6702b1f5656a0b146abe210aAnna Zaks const VarDecl *VD = dyn_cast_or_null<VarDecl>(*DS->decl_begin()); 4382b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 4398135886ab74d852a6702b1f5656a0b146abe210aAnna Zaks if (!VD) { 440ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks //TODO:AZ: remove explicit insertion after refactoring is done. 441ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Dst.insert(Pred); 442294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 443ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks } 444294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 445294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FIXME: all pre/post visits should eventually be handled by ::Visit(). 446294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreVisit; 447294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, DS, *this); 448294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 449c07cad8364e7fb0e8cb0d5181edb7db718271b65Jordan Rose ExplodedNodeSet dstEvaluated; 450c07cad8364e7fb0e8cb0d5181edb7db718271b65Jordan Rose StmtNodeBuilder B(dstPreVisit, dstEvaluated, *currBldrCtx); 451294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (ExplodedNodeSet::iterator I = dstPreVisit.begin(), E = dstPreVisit.end(); 452294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek I!=E; ++I) { 453294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *N = *I; 4548bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = N->getState(); 455294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const LocationContext *LC = N->getLocationContext(); 4562b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 4572b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks // Decls without InitExpr are not initialized explicitly. 458294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (const Expr *InitEx = VD->getInit()) { 4592b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 4602b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks // Note in the state that the initialization has occurred. 4612b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks ExplodedNode *UpdatedN = N; 462e460c46c5d602f65354cab0879c458890273591cJordan Rose SVal InitVal = state->getSVal(InitEx, LC); 463b98b998e9a5637012ab39ad1dabdad7c798721e8Ted Kremenek 464f08740ba5903d089a53cc315c19286e2189f9ff3Ted Kremenek if (isa<CXXConstructExpr>(InitEx->IgnoreImplicit())) { 46548b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // We constructed the object directly in the variable. 46648b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // No need to bind anything. 4672b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks B.generateNode(DS, UpdatedN, state); 46848b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } else { 46948b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // We bound the temp obj region to the CXXConstructExpr. Now recover 47048b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // the lazy compound value when the variable is not a reference. 4715251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie if (AMgr.getLangOpts().CPlusPlus && VD->getType()->isRecordType() && 4725251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie !VD->getType()->isReferenceType()) { 473dc84cd5efdd3430efb22546b4ac656aa0540b210David Blaikie if (Optional<loc::MemRegionVal> M = 4745251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie InitVal.getAs<loc::MemRegionVal>()) { 4755251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie InitVal = state->getSVal(M->getRegion()); 4765251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie assert(InitVal.getAs<nonloc::LazyCompoundVal>()); 4775251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie } 47848b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } 47948b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose 48048b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // Recover some path-sensitivity if a scalar value evaluated to 48148b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // UnknownVal. 48248b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose if (InitVal.isUnknown()) { 48348b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose QualType Ty = InitEx->getType(); 48448b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose if (InitEx->isGLValue()) { 48548b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose Ty = getContext().getPointerType(Ty); 48648b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } 48748b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose 4883b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek InitVal = svalBuilder.conjureSymbolVal(0, InitEx, LC, Ty, 48966c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->blockCount()); 49048b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose } 4912b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 4922b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks 4932b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks B.takeNodes(UpdatedN); 49448b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose ExplodedNodeSet Dst2; 4952b6876173b36d92aaf379c29cb339d91b4d358eeAnna Zaks evalBind(Dst2, DS, UpdatedN, state->getLValue(VD, LC), InitVal, true); 49648b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose B.addNodes(Dst2); 497294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 498294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 499294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek else { 50032a549a64922af0903bdb777613ae7ae4490b70fTed Kremenek B.generateNode(DS, N, state); 501294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 502294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 503c07cad8364e7fb0e8cb0d5181edb7db718271b65Jordan Rose 504c07cad8364e7fb0e8cb0d5181edb7db718271b65Jordan Rose getCheckerManager().runCheckersForPostStmt(Dst, B.getResults(), DS, *this); 505294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 506294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 5076a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labathstatic ProgramStateRef evaluateLogicalExpression(const Expr *E, 5086a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath const LocationContext *LC, 5096a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath ProgramStateRef State) { 5106a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath SVal X = State->getSVal(E, LC); 5116a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath if (! X.isUnknown()) 5126a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath return State; 5136a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath 5146a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath const BinaryOperator *B = dyn_cast<BinaryOperator>(E->IgnoreParens()); 5156a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath if (!B || (B->getOpcode() != BO_LAnd && B->getOpcode() != BO_LOr)) 5166a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath return State; 5176a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath 5186a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath State = evaluateLogicalExpression(B->getLHS(), LC, State); 5196a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath X = State->getSVal(B->getLHS(), LC); 5206a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath QualType XType = B->getLHS()->getType(); 5216a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath 5226a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath assert(X.isConstant()); 5236a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath if (!X.isZeroConstant() == (B->getOpcode() == BO_LAnd)) { 5246a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath // LHS not sufficient, we need to check RHS as well 5256a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath State = evaluateLogicalExpression(B->getRHS(), LC, State); 5266a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath X = State->getSVal(B->getRHS(), LC); 5276a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath XType = B->getRHS()->getType(); 5286a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath } 5296a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath 5306a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath SValBuilder &SVB = State->getStateManager().getSValBuilder(); 5316a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath return State->BindExpr(E, LC, SVB.evalCast(X, B->getType(), XType)); 5326a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath} 5336a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath 534294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitLogicalExpr(const BinaryOperator* B, ExplodedNode *Pred, 535294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 536294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(B->getOpcode() == BO_LAnd || 537294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek B->getOpcode() == BO_LOr); 538ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks 53966c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx); 5408bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 5413f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek 5426a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath state = evaluateLogicalExpression(B, Pred->getLocationContext(), state); 5436a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath SVal X = state->getSVal(B, Pred->getLocationContext()); 5446a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath 5456a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath if (!X.isUndef()) { 5466a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath DefinedOrUnknownSVal DefinedRHS = X.castAs<DefinedOrUnknownSVal>(); 5476a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath ProgramStateRef StTrue, StFalse; 5486a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath llvm::tie(StTrue, StFalse) = state->assume(DefinedRHS); 5496a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath if (StTrue) { 5506a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath if (!StFalse) { 5516a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath // The value is known to be true. 5526a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath X = getSValBuilder().makeIntVal(1, B->getType()); 5536a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath } // else The truth value of X is unknown, just leave it as it is. 554707a8659a546d32cf976d4c3927c793a643b18e1Ted Kremenek } else { 5556a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath // The value is known to be false. 5566a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath assert(StFalse && "Infeasible path!"); 5576a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath X = getSValBuilder().makeIntVal(0, B->getType()); 5587f839a6b35e5007964b538423b0a570eed26fc10Jordan Rose } 559294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 5606a556a42d48cc098fb8dcb5d4ecdd0e03e32c0ecPavel Labath 5613f635c08b2d0b2d5bafb38da09589cb238407faaTed Kremenek Bldr.generateNode(B, Pred, state->BindExpr(B, Pred->getLocationContext(), X)); 562294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 563294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 564294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitInitListExpr(const InitListExpr *IE, 565294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 566294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 56766c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 568294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 5698bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 5705eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 571294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek QualType T = getContext().getCanonicalType(IE->getType()); 572294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek unsigned NumInitElements = IE->getNumInits(); 573bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks 574bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks if (!IE->isGLValue() && 575bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks (T->isArrayType() || T->isRecordType() || T->isVectorType() || 576bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks T->isAnyComplexType())) { 577294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek llvm::ImmutableList<SVal> vals = getBasicVals().getEmptySValList(); 578294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 579294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Handle base case where the initializer has no elements. 580294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // e.g: static int* myArray[] = {}; 581294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (NumInitElements == 0) { 582294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal V = svalBuilder.makeCompoundVal(T, vals); 5835eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, V)); 584294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 585294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 586294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 587294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek for (InitListExpr::const_reverse_iterator it = IE->rbegin(), 588294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ei = IE->rend(); it != ei; ++it) { 5891994e3993e5e2c606f4ab22563768af6f03dad30Ted Kremenek SVal V = state->getSVal(cast<Expr>(*it), LCtx); 5901994e3993e5e2c606f4ab22563768af6f03dad30Ted Kremenek vals = getBasicVals().consVals(V, vals); 591294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 592294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 5936b6152ba96c164a292cc0b8d8b1d4cecbec27a60Anna Zaks B.generateNode(IE, Pred, 5945eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state->BindExpr(IE, LCtx, 5955eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek svalBuilder.makeCompoundVal(T, vals))); 596294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 597294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 59813dd47a0c01f8b4a6b3fbe379218f7ba8e692d0fAnna Zaks 599bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks // Handle scalars: int{5} and int{} and GLvalues. 600bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks // Note, if the InitListExpr is a GLvalue, it means that there is an address 601bd34520a8c4fe689cca8afaa8114e50bd6bad8f8Anna Zaks // representing it, so it must have a single init element. 60289e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose assert(NumInitElements <= 1); 60389e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose 60489e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose SVal V; 60589e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose if (NumInitElements == 0) 60689e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose V = getSValBuilder().makeZeroVal(T); 60789e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose else 60889e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose V = state->getSVal(IE->getInit(0), LCtx); 60989e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose 61089e5aaf57e20b39e35b0d068ebbc09ae736f2e1eJordan Rose B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, V)); 611294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 612294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 613294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitGuardedExpr(const Expr *Ex, 614294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *L, 615294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *R, 616294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, 617294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 618d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks assert(L && R); 619d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks 62066c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 6218bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 6225eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 6236da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek const CFGBlock *SrcBlock = 0; 624469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek 625d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks // Find the predecessor block. 626d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks ProgramStateRef SrcState = state; 6276da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek for (const ExplodedNode *N = Pred ; N ; N = *N->pred_begin()) { 6286da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek ProgramPoint PP = N->getLocation(); 6297a95de68c093991047ed8d339479ccad51b88663David Blaikie if (PP.getAs<PreStmtPurgeDeadSymbols>() || PP.getAs<BlockEntrance>()) { 6306da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek assert(N->pred_size() == 1); 6316da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek continue; 6326da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek } 6337a95de68c093991047ed8d339479ccad51b88663David Blaikie SrcBlock = PP.castAs<BlockEdge>().getSrc(); 634d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks SrcState = N->getState(); 6356da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek break; 6366da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek } 6376da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek 63841f3f3a4792f46787632fdb94f952f6b3ce3f4aeJordan Rose assert(SrcBlock && "missing function entry"); 63941f3f3a4792f46787632fdb94f952f6b3ce3f4aeJordan Rose 6406da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek // Find the last expression in the predecessor block. That is the 6416da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek // expression that is used for the value of the ternary expression. 6426da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek bool hasValue = false; 643469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek SVal V; 6446da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek 6456da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek for (CFGBlock::const_reverse_iterator I = SrcBlock->rbegin(), 6466da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek E = SrcBlock->rend(); I != E; ++I) { 6476da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek CFGElement CE = *I; 648b07805485c603be3d8011f72611465324c9e664bDavid Blaikie if (Optional<CFGStmt> CS = CE.getAs<CFGStmt>()) { 649b07805485c603be3d8011f72611465324c9e664bDavid Blaikie const Expr *ValEx = cast<Expr>(CS->getStmt()); 650d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks ValEx = ValEx->IgnoreParens(); 651d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks 652d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks // For GNU extension '?:' operator, the left hand side will be an 653d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks // OpaqueValueExpr, so get the underlying expression. 654d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks if (const OpaqueValueExpr *OpaqueEx = dyn_cast<OpaqueValueExpr>(L)) 655d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks L = OpaqueEx->getSourceExpr(); 656d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks 657d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks // If the last expression in the predecessor block matches true or false 658d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks // subexpression, get its the value. 659d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks if (ValEx == L->IgnoreParens() || ValEx == R->IgnoreParens()) { 660d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks hasValue = true; 661d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks V = SrcState->getSVal(ValEx, LCtx); 662d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks } 663469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek break; 664469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek } 665469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek } 6666da60499eae46caf9f92f7ba35c607043dc3f7faTed Kremenek 667d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks if (!hasValue) 668d8eeac5bd5e3cca0b3ff3993ee479ec9e66f386eAnna Zaks V = svalBuilder.conjureSymbolVal(0, Ex, LCtx, currBldrCtx->blockCount()); 669469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek 670469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek // Generate a new node with the binding from the appropriate path. 671469841a8e0967f038aa0f78e1926ce82e06248c7Ted Kremenek B.generateNode(Ex, Pred, state->BindExpr(Ex, LCtx, V, true)); 672294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 673294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 674294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine:: 675294fd0a62b95f512637910bf85c7efa6c2354b50Ted KremenekVisitOffsetOfExpr(const OffsetOfExpr *OOE, 676294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNode *Pred, ExplodedNodeSet &Dst) { 67766c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 67880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APSInt IV; 67980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (OOE->EvaluateAsInt(IV, getContext())) { 680294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert(IV.getBitWidth() == getContext().getTypeSize(OOE->getType())); 681a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose assert(OOE->getType()->isBuiltinType()); 682a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose assert(OOE->getType()->getAs<BuiltinType>()->isInteger()); 683a5796f87229b4aeebca71fa6ee1790ae7a5a0382Jordan Rose assert(IV.isSigned() == OOE->getType()->isSignedIntegerType()); 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) { 730d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose // FIXME: Prechecks eventually go in ::Visit(). 731d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose ExplodedNodeSet CheckedSet; 732d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose getCheckerManager().runCheckersForPreStmt(CheckedSet, Pred, U, *this); 733d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose 734d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose ExplodedNodeSet EvalSet; 735d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose StmtNodeBuilder Bldr(CheckedSet, EvalSet, *currBldrCtx); 736d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose 737d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose for (ExplodedNodeSet::iterator I = CheckedSet.begin(), E = CheckedSet.end(); 738d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose I != E; ++I) { 739d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose switch (U->getOpcode()) { 740ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks default: { 741d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose Bldr.takeNodes(*I); 742ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks ExplodedNodeSet Tmp; 743d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose VisitIncrementDecrementOperator(U, *I, Tmp); 744ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.addNodes(Tmp); 745294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek break; 746d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose } 747294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Real: { 748294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 749294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 750019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // FIXME: We don't have complex SValues yet. 751019316636b0a2d2273b945a98e52d454acee66efTed Kremenek if (Ex->getType()->isAnyComplexType()) { 752019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // Just report "Unknown." 753019316636b0a2d2273b945a98e52d454acee66efTed Kremenek break; 754019316636b0a2d2273b945a98e52d454acee66efTed Kremenek } 755294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 756019316636b0a2d2273b945a98e52d454acee66efTed Kremenek // For all other types, UO_Real is an identity operation. 757019316636b0a2d2273b945a98e52d454acee66efTed Kremenek assert (U->getType() == Ex->getType()); 758d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose ProgramStateRef state = (*I)->getState(); 759d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose const LocationContext *LCtx = (*I)->getLocationContext(); 760d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, 761d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose state->getSVal(Ex, LCtx))); 7628ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 763294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 764294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 765c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek case UO_Imag: { 766294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 767c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // FIXME: We don't have complex SValues yet. 768c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek if (Ex->getType()->isAnyComplexType()) { 769c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // Just report "Unknown." 770c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek break; 771294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 772c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek // For all other types, UO_Imag returns 0. 773d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose ProgramStateRef state = (*I)->getState(); 774d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose const LocationContext *LCtx = (*I)->getLocationContext(); 775c1e08dc876d7944678214f0ba222e258d62c9953Ted Kremenek SVal X = svalBuilder.makeZeroVal(Ex->getType()); 776d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, X)); 7778ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 778294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 779294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 780294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Plus: 781591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks assert(!U->isGLValue()); 782294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // FALL-THROUGH. 783294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Deref: 784294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_AddrOf: 785294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Extension: { 786224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // FIXME: We can probably just have some magic in Environment::getSVal() 787224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // that propagates values, instead of creating a new node here. 788224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // 789294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Unary "+" is a no-op, similar to a parentheses. We still have places 790294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // where it may be a block-level expression, so we need to 791294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // generate an extra node that just propagates the value of the 792224c48945b1687489a8079fb4fcc42b409823400Ted Kremenek // subexpression. 793294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 794d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose ProgramStateRef state = (*I)->getState(); 795d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose const LocationContext *LCtx = (*I)->getLocationContext(); 796d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, 797d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose state->getSVal(Ex, LCtx))); 7988ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 799294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 800294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 801294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_LNot: 802294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Minus: 803294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek case UO_Not: { 804591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks assert (!U->isGLValue()); 805294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 806d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose ProgramStateRef state = (*I)->getState(); 807d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose const LocationContext *LCtx = (*I)->getLocationContext(); 808294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 809a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // Get the value of the subexpression. 810a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek SVal V = state->getSVal(Ex, LCtx); 811294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 812a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek if (V.isUnknownOrUndef()) { 813d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, V)); 814a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 815a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 816294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 817a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek switch (U->getOpcode()) { 818a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek default: 819a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek llvm_unreachable("Invalid Opcode."); 820a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_Not: 821a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // FIXME: Do we need to handle promotions? 8225251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie state = state->BindExpr(U, LCtx, evalComplement(V.castAs<NonLoc>())); 823a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 824a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_Minus: 825a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // FIXME: Do we need to handle promotions? 8265251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie state = state->BindExpr(U, LCtx, evalMinus(V.castAs<NonLoc>())); 827a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 828a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek case UO_LNot: 829a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // C99 6.5.3.3: "The expression !E is equivalent to (0==E)." 830a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // 831a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // Note: technically we do "E == 0", but this is the same in the 832a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek // transfer functions as "0 == E". 833a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek SVal Result; 834dc84cd5efdd3430efb22546b4ac656aa0540b210David Blaikie if (Optional<Loc> LV = V.getAs<Loc>()) { 835a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek Loc X = svalBuilder.makeNull(); 8365251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie Result = evalBinOp(state, BO_EQ, *LV, X, U->getType()); 837a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 8389195caf28f2a5dcef1e299bf3e5232a018ca1c68Ted Kremenek else if (Ex->getType()->isFloatingType()) { 8399195caf28f2a5dcef1e299bf3e5232a018ca1c68Ted Kremenek // FIXME: handle floating point types. 8409195caf28f2a5dcef1e299bf3e5232a018ca1c68Ted Kremenek Result = UnknownVal(); 8419195caf28f2a5dcef1e299bf3e5232a018ca1c68Ted Kremenek } else { 842a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek nonloc::ConcreteInt X(getBasicVals().getValue(0, Ex->getType())); 8435251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie Result = evalBinOp(state, BO_EQ, V.castAs<NonLoc>(), X, 844a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek U->getType()); 845a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek } 846a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek 847a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek state = state->BindExpr(U, LCtx, Result); 848a91ac5bae3944e0eed9ef25294dfb2b8681b8159Ted Kremenek break; 849294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 850d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose Bldr.generateNode(U, *I, state); 8518ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks break; 852294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 853d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose } 854294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 8558ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks 856d7c47d94a55a03aeea14d411768e5593f50445daJordan Rose getCheckerManager().runCheckersForPostStmt(Dst, EvalSet, U, *this); 8578ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks} 8588ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks 8598ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaksvoid ExprEngine::VisitIncrementDecrementOperator(const UnaryOperator* U, 8608ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNode *Pred, 8618ad8c546372fe602708cb7ceeaf0ebbb866735c6Anna Zaks ExplodedNodeSet &Dst) { 862294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Handle ++ and -- (both pre- and post-increment). 863294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek assert (U->isIncrementDecrementOp()); 864294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParens(); 865294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8669050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 8679050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ProgramStateRef state = Pred->getState(); 8689050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal loc = state->getSVal(Ex, LCtx); 8699050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8709050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Perform a load. 8719050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Tmp; 872bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalLoad(Tmp, U, Ex, Pred, state, loc); 8739050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8749050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Dst2; 87566c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder Bldr(Tmp, Dst2, *currBldrCtx); 8769050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek for (ExplodedNodeSet::iterator I=Tmp.begin(), E=Tmp.end();I!=E;++I) { 877294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8789050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = (*I)->getState(); 8799050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek assert(LCtx == (*I)->getLocationContext()); 8809050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal V2_untested = state->getSVal(Ex, LCtx); 881294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 8829050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Propagate unknown and undefined values. 8839050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (V2_untested.isUnknownOrUndef()) { 8849050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, V2_untested)); 8859050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek continue; 8869050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek } 8875251abea41b446c26e3239c8dd6c7edea6fc335dDavid Blaikie DefinedSVal V2 = V2_untested.castAs<DefinedSVal>(); 8889050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8899050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Handle all other values. 8909050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek BinaryOperator::Opcode Op = U->isIncrementOp() ? BO_Add : BO_Sub; 8919050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8929050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // If the UnaryOperator has non-location type, use its type to create the 8939050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // constant value. If the UnaryOperator has location type, create the 8949050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // constant with int type and pointer width. 8959050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal RHS; 8969050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 8979050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (U->getType()->isAnyPointerType()) 8989050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek RHS = svalBuilder.makeArrayIndex(1); 899d04713598ee8af6e01b925dca4e38bfd78227dadJordan Rose else if (U->getType()->isIntegralOrEnumerationType()) 9009050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek RHS = svalBuilder.makeIntVal(1, U->getType()); 901d04713598ee8af6e01b925dca4e38bfd78227dadJordan Rose else 902d04713598ee8af6e01b925dca4e38bfd78227dadJordan Rose RHS = UnknownVal(); 9039050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9049050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek SVal Result = evalBinOp(state, Op, V2, RHS, U->getType()); 9059050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9069050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Conjure a new symbol if necessary to recover precision. 9079050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (Result.isUnknown()){ 9089050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek DefinedOrUnknownSVal SymVal = 90966c486f275531df6362b3511fc3af6563561801bTed Kremenek svalBuilder.conjureSymbolVal(0, Ex, LCtx, currBldrCtx->blockCount()); 9109050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Result = SymVal; 911294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 9129050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // If the value is a location, ++/-- should always preserve 9139050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // non-nullness. Check if the original value was non-null, and if so 9149050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // propagate that constraint. 9159050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (Loc::isLocType(U->getType())) { 9169050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek DefinedOrUnknownSVal Constraint = 9179050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek svalBuilder.evalEQ(state, V2,svalBuilder.makeZeroVal(U->getType())); 918294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 9199050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek if (!state->assume(Constraint, true)) { 9209050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // It isn't feasible for the original value to be null. 9219050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Propagate this constraint. 9229050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Constraint = svalBuilder.evalEQ(state, SymVal, 9239050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek svalBuilder.makeZeroVal(U->getType())); 924294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 9259050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9269050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->assume(Constraint, false); 9279050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek assert(state); 928294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 929294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 930294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 9319050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9329050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Since the lvalue-to-rvalue conversion is explicit in the AST, 9339050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // we bind an l-value if the operator is prefix and an lvalue (in C++). 934591b5f53c0e11d87401b4804bb1be1a53f95c619Anna Zaks if (U->isGLValue()) 9359050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->BindExpr(U, LCtx, loc); 9369050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek else 9379050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek state = state->BindExpr(U, LCtx, U->isPostfix() ? V2 : Result); 9389050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek 9399050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek // Perform the store. 9409050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.takeNodes(*I); 9419050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek ExplodedNodeSet Dst3; 942bd613137499b1d4c3b63dccd0aa21f6add243f4fTed Kremenek evalStore(Dst3, U, U, *I, state, loc, Result); 9439050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Bldr.addNodes(Dst3); 944294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 9459050e3ad959d08fb53446a5e261e66aaa97d9fc8Ted Kremenek Dst.insert(Dst2); 946294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 947