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