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//===-- ValidatingSolver.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/Expr/Constraints.h"
#include "klee/Solver/Solver.h"
#include "klee/Solver/SolverImpl.h"
#include <memory>
#include <utility>
#include <vector>
namespace klee {
class ValidatingSolver : public SolverImpl {
private:
std::unique_ptr<Solver> solver;
std::unique_ptr<Solver, void(*)(Solver*)> oracle;
public:
ValidatingSolver(std::unique_ptr<Solver> solver, Solver *oracle,
bool ownsOracle)
: solver(std::move(solver)),
oracle(
oracle, ownsOracle ? [](Solver *solver) { delete solver; }
: [](Solver *) {}) {}
bool computeValidity(const Query &, Solver::Validity &result);
bool computeTruth(const Query &, bool &isValid);
bool computeValue(const Query &, ref<Expr> &result);
bool computeInitialValues(const Query &,
const std::vector<const Array *> &objects,
std::vector<std::vector<unsigned char>> &values,
bool &hasSolution);
SolverRunStatus getOperationStatusCode();
std::string getConstraintLog(const Query &) override;
void setCoreSolverTimeout(time::Span timeout);
};
bool ValidatingSolver::computeTruth(const Query &query, bool &isValid) {
bool answer;
if (!solver->impl->computeTruth(query, isValid))
return false;
if (!oracle->impl->computeTruth(query, answer))
return false;
if (isValid != answer)
assert(0 && "invalid solver result (computeTruth)");
return true;
}
bool ValidatingSolver::computeValidity(const Query &query,
Solver::Validity &result) {
Solver::Validity answer;
if (!solver->impl->computeValidity(query, result))
return false;
if (!oracle->impl->computeValidity(query, answer))
return false;
if (result != answer)
assert(0 && "invalid solver result (computeValidity)");
return true;
}
bool ValidatingSolver::computeValue(const Query &query, ref<Expr> &result) {
bool answer;
if (!solver->impl->computeValue(query, result))
return false;
// We don't want to compare, but just make sure this is a legal
// solution.
if (!oracle->impl->computeTruth(
query.withExpr(NeExpr::create(query.expr, result)), answer))
return false;
if (answer)
assert(0 && "invalid solver result (computeValue)");
return true;
}
bool ValidatingSolver::computeInitialValues(
const Query &query, const std::vector<const Array *> &objects,
std::vector<std::vector<unsigned char> > &values, bool &hasSolution) {
bool answer;
if (!solver->impl->computeInitialValues(query, objects, values, hasSolution))
return false;
if (hasSolution) {
// Assert the bindings as constraints, and verify that the
// conjunction of the actual constraints is satisfiable.
ConstraintSet bindings;
for (unsigned i = 0; i != values.size(); ++i) {
const Array *array = objects[i];
assert(array);
for (unsigned j = 0; j < array->size; j++) {
unsigned char value = values[i][j];
bindings.push_back(EqExpr::create(
ReadExpr::create(UpdateList(array, 0),
ConstantExpr::alloc(j, array->getDomain())),
ConstantExpr::alloc(value, array->getRange())));
}
}
ConstraintManager tmp(bindings);
ref<Expr> constraints = Expr::createIsZero(query.expr);
for (auto const &constraint : query.constraints)
constraints = AndExpr::create(constraints, constraint);
if (!oracle->impl->computeTruth(Query(bindings, constraints), answer))
return false;
if (!answer)
assert(0 && "invalid solver result (computeInitialValues)");
} else {
if (!oracle->impl->computeTruth(query, answer))
return false;
if (!answer)
assert(0 && "invalid solver result (computeInitialValues)");
}
return true;
}
SolverImpl::SolverRunStatus ValidatingSolver::getOperationStatusCode() {
return solver->impl->getOperationStatusCode();
}
std::string ValidatingSolver::getConstraintLog(const Query &query) {
return solver->impl->getConstraintLog(query);
}
void ValidatingSolver::setCoreSolverTimeout(time::Span timeout) {
solver->impl->setCoreSolverTimeout(timeout);
}
std::unique_ptr<Solver> createValidatingSolver(std::unique_ptr<Solver> s,
Solver *oracle,
bool ownsOracle) {
return std::make_unique<Solver>(
std::make_unique<ValidatingSolver>(std::move(s), oracle, ownsOracle));
}
}
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