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//===-- TimingSolver.cpp --------------------------------------------------===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "TimingSolver.h"
#include "klee/ExecutionState.h"
#include "klee/Solver.h"
#include "klee/Statistics.h"
#include "CoreStats.h"
#include "llvm/System/Process.h"
using namespace klee;
using namespace llvm;
/***/
bool TimingSolver::evaluate(const ExecutionState& state, ref<Expr> expr,
Solver::Validity &result) {
// Fast path, to avoid timer and OS overhead.
if (expr.isConstant()) {
result = expr.getConstantValue() ? Solver::True : Solver::False;
return true;
}
sys::TimeValue now(0,0),user(0,0),delta(0,0),sys(0,0);
sys::Process::GetTimeUsage(now,user,sys);
if (simplifyExprs)
expr = state.constraints.simplifyExpr(expr);
bool success = solver->evaluate(Query(state.constraints, expr), result);
sys::Process::GetTimeUsage(delta,user,sys);
delta -= now;
stats::solverTime += delta.usec();
state.queryCost += delta.usec()/1000000.;
return success;
}
bool TimingSolver::mustBeTrue(const ExecutionState& state, ref<Expr> expr,
bool &result) {
// Fast path, to avoid timer and OS overhead.
if (expr.isConstant()) {
result = expr.getConstantValue() ? true : false;
return true;
}
sys::TimeValue now(0,0),user(0,0),delta(0,0),sys(0,0);
sys::Process::GetTimeUsage(now,user,sys);
if (simplifyExprs)
expr = state.constraints.simplifyExpr(expr);
bool success = solver->mustBeTrue(Query(state.constraints, expr), result);
sys::Process::GetTimeUsage(delta,user,sys);
delta -= now;
stats::solverTime += delta.usec();
state.queryCost += delta.usec()/1000000.;
return success;
}
bool TimingSolver::mustBeFalse(const ExecutionState& state, ref<Expr> expr,
bool &result) {
return mustBeTrue(state, Expr::createNot(expr), result);
}
bool TimingSolver::mayBeTrue(const ExecutionState& state, ref<Expr> expr,
bool &result) {
bool res;
if (!mustBeFalse(state, expr, res))
return false;
result = !res;
return true;
}
bool TimingSolver::mayBeFalse(const ExecutionState& state, ref<Expr> expr,
bool &result) {
bool res;
if (!mustBeTrue(state, expr, res))
return false;
result = !res;
return true;
}
bool TimingSolver::getValue(const ExecutionState& state, ref<Expr> expr,
ref<Expr> &result) {
// Fast path, to avoid timer and OS overhead.
if (expr.isConstant()) {
result = expr;
return true;
}
sys::TimeValue now(0,0),user(0,0),delta(0,0),sys(0,0);
sys::Process::GetTimeUsage(now,user,sys);
if (simplifyExprs)
expr = state.constraints.simplifyExpr(expr);
bool success = solver->getValue(Query(state.constraints, expr), result);
sys::Process::GetTimeUsage(delta,user,sys);
delta -= now;
stats::solverTime += delta.usec();
state.queryCost += delta.usec()/1000000.;
return success;
}
bool
TimingSolver::getInitialValues(const ExecutionState& state,
const std::vector<const Array*>
&objects,
std::vector< std::vector<unsigned char> >
&result) {
if (objects.empty())
return true;
sys::TimeValue now(0,0),user(0,0),delta(0,0),sys(0,0);
sys::Process::GetTimeUsage(now,user,sys);
bool success = solver->getInitialValues(Query(state.constraints,
ConstantExpr::alloc(0, Expr::Bool)),
objects, result);
sys::Process::GetTimeUsage(delta,user,sys);
delta -= now;
stats::solverTime += delta.usec();
state.queryCost += delta.usec()/1000000.;
return success;
}
std::pair< ref<Expr>, ref<Expr> >
TimingSolver::getRange(const ExecutionState& state, ref<Expr> expr) {
return solver->getRange(Query(state.constraints, expr));
}
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