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/*-----------------------------------------------------------------------
File : ccl_context_sr.c
Author: Stephan Schulz
Contents
Implementation of contextual (top level) simplify-reflect.
Copyright 2003 by the author.
This code is released under the GNU General Public Licence and
the GNU Lesser General Public License.
See the file COPYING in the main E directory for details..
Run "eprover -h" for contact information.
Changes
<1> Mon Jul 14 23:20:54 CEST 2003
New
-----------------------------------------------------------------------*/
#include "ccl_context_sr.h"
/*---------------------------------------------------------------------*/
/* Global Variables */
/*---------------------------------------------------------------------*/
/*---------------------------------------------------------------------*/
/* Forward Declarations */
/*---------------------------------------------------------------------*/
/*---------------------------------------------------------------------*/
/* Internal Functions */
/*---------------------------------------------------------------------*/
/*---------------------------------------------------------------------*/
/* Exported Functions */
/*---------------------------------------------------------------------*/
/*-----------------------------------------------------------------------
//
// Function: ClauseContextualSimplifyReflect()
//
// Perform contextial-simplify-reflect with all clauses in set on
// clause. Return number of literals deleted.
//
// Global Variables: -
//
// Side Effects : Changes clause
//
/----------------------------------------------------------------------*/
int ClauseContextualSimplifyReflect(ClauseSet_p set, Clause_p clause)
{
Eqn_p handle;
int res = 0;
Clause_p subsumer;
PStack_p lit_stack = ClauseToStack(clause);
clause->weight = ClauseStandardWeight(clause);
while(!PStackEmpty(lit_stack))
{
handle = PStackPopP(lit_stack);
ClauseFlipLiteralSign(clause, handle);
ClauseSubsumeOrderSortLits(clause);
subsumer = ClauseSetSubsumesClause(set, clause);
if(subsumer)
{
if(ClauseQueryProp(subsumer, CPIsSOS))
{
ClauseSetProp(clause, CPIsSOS);
}
ClauseDelProp(clause, CPInitial|CPLimitedRW);
ClauseRemoveLiteral(clause, handle);
assert(clause->weight == ClauseStandardWeight(clause));
DocClauseModificationDefault(clause,
inf_context_simplify_reflect,
subsumer);
res++;
ClausePushDerivation(clause, DCContextSR, subsumer, NULL);
}
else
{
ClauseFlipLiteralSign(clause, handle);
}
}
PStackFree(lit_stack);
return res;
}
/*-----------------------------------------------------------------------
//
// Function: ClauseSetFindContextSRClauses()
//
// Find all clauses in set that can be contextually
// simplify-reflected ;-) with clause and push them onto
// res. ATTENTION! A clause that can be simplified in more than one
// way will be pushed more than once onto the stack! Returns number
// of clauses pushed.
//
// Global Variables: -
//
// Side Effects : -
//
/----------------------------------------------------------------------*/
long ClauseSetFindContextSRClauses(ClauseSet_p set, Clause_p clause,
PStack_p res)
{
Eqn_p handle;
long old_sp = PStackGetSP(res);
PStack_p lit_stack = ClauseToStack(clause);
assert(clause->weight == ClauseStandardWeight(clause));
while(!PStackEmpty(lit_stack))
{
handle = PStackPopP(lit_stack);
ClauseFlipLiteralSign(clause, handle);
ClauseSubsumeOrderSortLits(clause);
ClauseSetFindSubsumedClauses(set, clause, res);
ClauseFlipLiteralSign(clause, handle);
}
PStackFree(lit_stack);
return PStackGetSP(res) - old_sp;
}
/*---------------------------------------------------------------------*/
/* End of File */
/*---------------------------------------------------------------------*/
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