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//== ConstraintManager.cpp - Constraints on symbolic values -----*- C++ -*--==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defined the interface to manage constraints on symbolic values.
//
//===----------------------------------------------------------------------===//
#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h"
#include "llvm/Support/SaveAndRestore.h"
using namespace clang;
using namespace ento;
ConstraintManager::~ConstraintManager() {}
static DefinedSVal getLocFromSymbol(const ProgramStateRef &State,
SymbolRef Sym) {
const MemRegion *R = State->getStateManager().getRegionManager()
.getSymbolicRegion(Sym);
return loc::MemRegionVal(R);
}
/// Convenience method to query the state to see if a symbol is null or
/// not null, or neither assumption can be made.
ConditionTruthVal ConstraintManager::isNull(ProgramStateRef State,
SymbolRef Sym) {
// Disable recursive notification of clients.
llvm::SaveAndRestore<bool> DisableNotify(NotifyAssumeClients, false);
ProgramStateManager &Mgr = State->getStateManager();
QualType Ty = Sym->getType(Mgr.getContext());
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 ConditionTruthVal();
}
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