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//===-- IncompleteSolver.cpp ----------------------------------------------===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "klee/IncompleteSolver.h"
#include "klee/Constraints.h"
using namespace klee;
using namespace llvm;
/***/
IncompleteSolver::PartialValidity
IncompleteSolver::negatePartialValidity(PartialValidity pv) {
switch(pv) {
case MustBeTrue: return MustBeFalse;
case MustBeFalse: return MustBeTrue;
case MayBeTrue: return MayBeFalse;
case MayBeFalse: return MayBeTrue;
case TrueOrFalse: return TrueOrFalse;
default: assert(0 && "invalid partial validity");
}
}
IncompleteSolver::PartialValidity
IncompleteSolver::computeValidity(const Query& query) {
PartialValidity trueResult = computeTruth(query);
if (trueResult == MustBeTrue) {
return MustBeTrue;
} else {
PartialValidity falseResult = computeTruth(query.negateExpr());
if (falseResult == MustBeTrue) {
return MustBeFalse;
} else {
bool trueCorrect = trueResult != None,
falseCorrect = falseResult != None;
if (trueCorrect && falseCorrect) {
return TrueOrFalse;
} else if (trueCorrect) { // ==> trueResult == MayBeFalse
return MayBeFalse;
} else if (falseCorrect) { // ==> falseResult == MayBeFalse
return MayBeTrue;
} else {
return None;
}
}
}
}
/***/
StagedSolverImpl::StagedSolverImpl(IncompleteSolver *_primary,
Solver *_secondary)
: primary(_primary),
secondary(_secondary) {
}
StagedSolverImpl::~StagedSolverImpl() {
delete primary;
delete secondary;
}
bool StagedSolverImpl::computeTruth(const Query& query, bool &isValid) {
IncompleteSolver::PartialValidity trueResult = primary->computeTruth(query);
if (trueResult != IncompleteSolver::None) {
isValid = (trueResult == IncompleteSolver::MustBeTrue);
return true;
}
return secondary->impl->computeTruth(query, isValid);
}
bool StagedSolverImpl::computeValidity(const Query& query,
Solver::Validity &result) {
bool tmp;
switch(primary->computeValidity(query)) {
case IncompleteSolver::MustBeTrue:
result = Solver::True;
break;
case IncompleteSolver::MustBeFalse:
result = Solver::False;
break;
case IncompleteSolver::TrueOrFalse:
result = Solver::Unknown;
break;
case IncompleteSolver::MayBeTrue:
if (!secondary->impl->computeTruth(query, tmp))
return false;
result = tmp ? Solver::True : Solver::Unknown;
break;
case IncompleteSolver::MayBeFalse:
if (!secondary->impl->computeTruth(query.negateExpr(), tmp))
return false;
result = tmp ? Solver::False : Solver::Unknown;
break;
default:
if (!secondary->impl->computeValidity(query, result))
return false;
break;
}
return true;
}
bool StagedSolverImpl::computeValue(const Query& query,
ref<Expr> &result) {
if (primary->computeValue(query, result))
return true;
return secondary->impl->computeValue(query, result);
}
bool
StagedSolverImpl::computeInitialValues(const Query& query,
const std::vector<const Array*>
&objects,
std::vector< std::vector<unsigned char> >
&values,
bool &hasSolution) {
if (primary->computeInitialValues(query, objects, values, hasSolution))
return true;
return secondary->impl->computeInitialValues(query, objects, values,
hasSolution);
}
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