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/******************************************************************************
* Top contributors (to current version):
* Andrew Reynolds
*
* This file is part of the cvc5 project.
*
* Copyright (c) 2009-2021 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.
* ****************************************************************************
*
* Justification stack.
*/
#include "decision/justify_stack.h"
namespace cvc5 {
namespace decision {
JustifyStack::JustifyStack(context::Context* c)
: d_context(c), d_current(c), d_stack(c), d_stackSizeValid(c, 0)
{
}
JustifyStack::~JustifyStack() {}
void JustifyStack::reset(TNode curr)
{
d_current = curr;
d_stackSizeValid = 0;
pushToStack(curr, prop::SAT_VALUE_TRUE);
}
void JustifyStack::clear()
{
d_current = TNode::null();
d_stackSizeValid = 0;
}
size_t JustifyStack::size() const { return d_stackSizeValid.get(); }
TNode JustifyStack::getCurrentAssertion() const { return d_current.get(); }
bool JustifyStack::hasCurrentAssertion() const
{
return !d_current.get().isNull();
}
JustifyInfo* JustifyStack::getCurrent()
{
if (d_stackSizeValid.get() == 0)
{
return nullptr;
}
Assert(d_stack.size() >= d_stackSizeValid.get());
return d_stack[d_stackSizeValid.get() - 1].get();
}
void JustifyStack::pushToStack(TNode n, prop::SatValue desiredVal)
{
if (Trace.isOn("jh-stack"))
{
for (size_t i = 0, ssize = d_stackSizeValid.get(); i < ssize; i++)
{
Trace("jh-stack") << " ";
}
Trace("jh-stack") << "- " << n << " " << desiredVal << std::endl;
}
// note that n is possibly negated here
JustifyInfo* ji = getOrAllocJustifyInfo(d_stackSizeValid.get());
ji->set(n, desiredVal);
d_stackSizeValid = d_stackSizeValid + 1;
}
void JustifyStack::popStack()
{
Assert(d_stackSizeValid.get() > 0);
d_stackSizeValid = d_stackSizeValid - 1;
}
JustifyInfo* JustifyStack::getOrAllocJustifyInfo(size_t i)
{
// don't request stack beyond the bound
Assert(i <= d_stack.size());
if (i == d_stack.size())
{
d_stack.push_back(std::make_shared<JustifyInfo>(d_context));
}
return d_stack[i].get();
}
}
} // namespace cvc5
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