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/********************* */
/*! \file decision_manager.cpp
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** This file is part of the CVC4 project.
** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief Implementation of Decision manager, which manages all decision
** strategies owned by theory solvers within TheoryEngine.
**/
#include "theory/decision_manager.h"
#include "theory/rewriter.h"
using namespace CVC4::kind;
namespace CVC4 {
namespace theory {
DecisionManager::DecisionManager(context::Context* userContext)
: d_strategyCacheC(userContext)
{
}
void DecisionManager::presolve()
{
Trace("dec-manager") << "DecisionManager: presolve." << std::endl;
// remove the strategies that are not in this user context
std::unordered_set<DecisionStrategy*> active;
for (DecisionStrategyList::const_iterator i = d_strategyCacheC.begin();
i != d_strategyCacheC.end();
++i)
{
active.insert(*i);
}
active.insert(d_strategyCache.begin(), d_strategyCache.end());
std::map<StrategyId, std::vector<DecisionStrategy*> > tmp = d_reg_strategy;
d_reg_strategy.clear();
for (std::pair<const StrategyId, std::vector<DecisionStrategy*> >& rs : tmp)
{
for (DecisionStrategy* ds : rs.second)
{
if (active.find(ds) != active.end())
{
// if its active, we keep it
d_reg_strategy[rs.first].push_back(ds);
}
}
}
}
void DecisionManager::registerStrategy(StrategyId id,
DecisionStrategy* ds,
StrategyScope sscope)
{
Trace("dec-manager") << "DecisionManager: Register strategy : "
<< ds->identify() << ", id = " << id << std::endl;
ds->initialize();
d_reg_strategy[id].push_back(ds);
if (sscope == STRAT_SCOPE_USER_CTX_DEPENDENT)
{
// store it in the user-context-dependent list
d_strategyCacheC.push_back(ds);
}
else if (sscope == STRAT_SCOPE_CTX_INDEPENDENT)
{
// it is context independent
d_strategyCache.insert(ds);
}
else
{
// it is local to this call, we don't cache it
Assert(sscope == STRAT_SCOPE_LOCAL_SOLVE);
}
}
Node DecisionManager::getNextDecisionRequest()
{
Trace("dec-manager-debug")
<< "DecisionManager: Get next decision..." << std::endl;
for (const std::pair<const StrategyId, std::vector<DecisionStrategy*> >& rs :
d_reg_strategy)
{
for (unsigned i = 0, size = rs.second.size(); i < size; i++)
{
DecisionStrategy* ds = rs.second[i];
Node lit = ds->getNextDecisionRequest();
if (!lit.isNull())
{
Trace("dec-manager")
<< "DecisionManager: -> literal " << lit << " decided by strategy "
<< ds->identify() << std::endl;
return lit;
}
Trace("dec-manager-debug") << "DecisionManager: " << ds->identify()
<< " has no decisions." << std::endl;
}
}
Trace("dec-manager-debug")
<< "DecisionManager: -> no decisions." << std::endl;
return Node::null();
}
} // namespace theory
} // namespace CVC4
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