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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2012-10-02 11:35:25 -07:00
parent 3f9edad676
commit e9eab22e5c
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lib/spc_der.cpp Normal file
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/*++
Copyright (c) 2006 Microsoft Corporation
Module Name:
spc_der.cpp
Abstract:
<abstract>
Author:
Leonardo de Moura (leonardo) 2008-02-17.
Revision History:
--*/
#include"spc_der.h"
#include"occurs.h"
namespace spc {
der::der(ast_manager & m):
m_manager(m),
m_subst(m),
m_spc_fid(m.get_family_id("spc")) {
m_subst.reserve_offsets(1);
}
void der::apply(clause * cls, unsigned j, expr * lhs, expr * rhs) {
TRACE("der", tout << "applying der at: " << j << "\n"; cls->display(tout, m_manager); tout << "\n";);
m_subst.reserve_vars(cls->get_num_vars());
m_subst.reset();
m_subst.insert(expr_offset(lhs, 0), expr_offset(rhs, 0));
literal_buffer new_lits(m_manager);
unsigned num_lits = cls->get_num_literals();
for (unsigned i = 0; i < num_lits; i++) {
if (i != j) {
literal const & l = cls->get_literal(i);
expr_ref new_atom(m_manager);
m_subst.apply(l.atom(), new_atom);
new_lits.push_back(literal(new_atom, l.sign()));
}
}
justification * js = mk_der_justification(m_manager, m_spc_fid, cls->get_justification(), new_lits.size(), new_lits.c_ptr());
cls->update_lits(m_manager, new_lits.size(), new_lits.c_ptr(), js);
}
bool der::apply(clause * cls) {
unsigned num_lits = cls->get_num_literals();
for (unsigned i = 0; i < num_lits; i++) {
literal const & l = cls->get_literal(i);
if (l.sign() && m_manager.is_eq(l.atom())) {
expr * lhs = l.lhs();
expr * rhs = l.rhs();
if (is_var(lhs) && !occurs(lhs, rhs)) {
apply(cls, i, lhs, rhs);
return true;
}
else if (is_var(rhs) && !occurs(rhs, lhs)) {
apply(cls, i, rhs, lhs);
return true;
}
}
}
return false;
}
/**
\brief Clause cls is destructively updated.
*/
void der::operator()(clause * cls) {
while(apply(cls))
;
}
};