44 lines
1.7 KiB
C++
44 lines
1.7 KiB
C++
//===- ConstraintManager.cpp - Constraints on symbolic values. ------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defined the interface to manage constraints on symbolic values.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/StaticAnalyzer/Core/PathSensitive/ConstraintManager.h"
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#include "clang/AST/Type.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState_Fwd.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/SVals.h"
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using namespace clang;
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using namespace ento;
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ConstraintManager::~ConstraintManager() = default;
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static DefinedSVal getLocFromSymbol(const ProgramStateRef &State,
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SymbolRef Sym) {
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const MemRegion *R =
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State->getStateManager().getRegionManager().getSymbolicRegion(Sym);
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return loc::MemRegionVal(R);
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}
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ConditionTruthVal ConstraintManager::checkNull(ProgramStateRef State,
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SymbolRef Sym) {
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QualType Ty = Sym->getType();
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DefinedSVal V = Loc::isLocType(Ty) ? getLocFromSymbol(State, Sym)
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: nonloc::SymbolVal(Sym);
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const ProgramStatePair &P = assumeDual(State, V);
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if (P.first && !P.second)
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return ConditionTruthVal(false);
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if (!P.first && P.second)
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return ConditionTruthVal(true);
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return {};
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}
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