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/**************************************************************/
/* ********************************************************** */
/* * * */
/* * STRUCTURE SHARING * */
/* * * */
/* * $Module: SHARING * */
/* * * */
/* * Copyright (C) 1996, 1997, 1998, 2000, 2001 * */
/* * MPI fuer Informatik * */
/* * * */
/* * This program is free software; you can redistribute * */
/* * it and/or modify it under the terms of the FreeBSD * */
/* * Licence. * */
/* * * */
/* * This program is distributed in the hope that it will * */
/* * be useful, but WITHOUT ANY WARRANTY; without even * */
/* * the implied warranty of MERCHANTABILITY or FITNESS * */
/* * FOR A PARTICULAR PURPOSE. See the LICENCE file * */
/* * for more details. * */
/* * * */
/* * * */
/* $Revision: 1.2 $ * */
/* $State: Exp $ * */
/* $Date: 2010-02-22 14:09:59 $ * */
/* $Author: weidenb $ * */
/* * * */
/* * Contact: * */
/* * Christoph Weidenbach * */
/* * MPI fuer Informatik * */
/* * Stuhlsatzenhausweg 85 * */
/* * 66123 Saarbruecken * */
/* * Email: spass@mpi-inf.mpg.de * */
/* * Germany * */
/* * * */
/* ********************************************************** */
/**************************************************************/
/* $RCSfile: sharing.h,v $ */
#ifndef _SHARING_
#define _SHARING_
/**************************************************************/
/* Includes */
/**************************************************************/
#include "term.h"
#include "st.h"
/**************************************************************/
/* Data Structures and Constants */
/**************************************************************/
/* Symbol Tables; constants are just positive */
/* integers and variables negative integers. */
/* For constants and vars is a special symbol */
/* table available, containing the sharing */
/* info, i.e. a POINTER to the term structure, if */
/* the symbol is already inserted in the sharing */
/* structure, a NULL Pointer else. */
typedef TERM VARTABLE[symbol__MAXVARIABLES];
typedef TERM CONSTTABLE[symbol__MAXSIGNATURE];
typedef struct {
st_INDEX index;
VARTABLE vartable;
CONSTTABLE consttable;
NAT stampId;
} SHARED_INDEX_NODE, *SHARED_INDEX;
/**************************************************************/
/* Inline Functions */
/**************************************************************/
static __inline__ st_INDEX sharing_Index(SHARED_INDEX ShIndex)
{
return ShIndex->index;
}
static __inline__ void sharing_SetIndex(SHARED_INDEX ShIndex, st_INDEX ST)
{
ShIndex->index = ST;
}
static __inline__ const TERM* sharing_Vartable(SHARED_INDEX ShIndex)
{
return ShIndex->vartable;
}
static __inline__ const TERM* sharing_Consttable(SHARED_INDEX ShIndex)
{
return ShIndex->consttable;
}
static __inline__ NAT sharing_StampID(SHARED_INDEX ShIndex)
{
return ShIndex->stampId;
}
static __inline__ void sharing_SetStampID(SHARED_INDEX ShIndex, NAT Stamp)
{
ShIndex->stampId = Stamp;
}
static __inline__ TERM sharing_VartableEntry(SHARED_INDEX ShIndex, NAT Index)
{
return ShIndex->vartable[Index];
}
static __inline__ void sharing_SetVartableEntry(SHARED_INDEX ShIndex,
NAT Index, TERM Term)
{
ShIndex->vartable[Index] = Term;
}
static __inline__ TERM sharing_ConsttableEntry(SHARED_INDEX ShIndex,
NAT Index)
{
return ShIndex->consttable[Index];
}
static __inline__ void sharing_SetConsttableEntry(SHARED_INDEX ShIndex,
NAT Index, TERM Term)
{
ShIndex->consttable[Index] = Term;
}
static __inline__ TERM sharing_GetVarFromSymbol(SYMBOL S, SHARED_INDEX ShIndex)
{
return sharing_VartableEntry(ShIndex, symbol_VarIndex(S));
}
static __inline__ int sharing_VariableIndex(TERM Term)
{
return symbol_VarIndex(term_TopSymbol(Term));
}
static __inline__ int sharing_ConstantIndex(TERM Term)
{
return symbol_Index(term_TopSymbol(Term));
}
static __inline__ BOOL sharing_IsSharedVar(TERM T, SHARED_INDEX ShIndex)
/* RETURNS: True if there's already an entry for the variable T */
/* in the Vartable of the shared index ShIndex. */
{
return sharing_VartableEntry(ShIndex, sharing_VariableIndex(T)) != NULL;
}
static __inline__ BOOL sharing_IsSharedConst(TERM T, SHARED_INDEX ShIndex)
/* True if there's already an entry for the constant T */
/* in the Consttable of the shared index ShIndex. */
{
return sharing_ConsttableEntry(ShIndex, sharing_ConstantIndex(T)) != NULL;
}
static __inline__ BOOL sharing_IsNotReallyShared(TERM Term)
/* Der einzige Superterm ist der in dem ich loesche */
{
return list_Length(term_SupertermList(Term)) <= 1;
}
static __inline__ void sharing_RememberSharedTermCopy(TERM Term, TERM Copy)
/* The unshared term Term has now a link to its shared copy */
{
term_RplacSuperterm(Term, Copy);
}
static __inline__ TERM sharing_SharedTermCopy(TERM Term)
/* Return the shared copy of the unshared term Term */
{
return term_Superterm(Term);
}
/**************************************************************/
/* Functions for Creation and Deletion of a SHARED_INDEX */
/**************************************************************/
SHARED_INDEX sharing_IndexCreate(void);
void sharing_IndexDelete(SHARED_INDEX);
/**************************************************************/
/* Functions on term insertion and deletion. */
/**************************************************************/
TERM sharing_Insert(POINTER, TERM, SHARED_INDEX);
void sharing_Delete(POINTER, TERM, SHARED_INDEX);
void sharing_PushOnStack(TERM);
void sharing_PushReverseOnStack(TERM);
void sharing_PushOnStackNoStamps(TERM);
void sharing_PushListOnStack(LIST);
void sharing_PushListReverseOnStack(LIST);
void sharing_PushListReverseOnStackExcept(LIST, LIST);
void sharing_PushListOnStackNoStamps(LIST);
/**************************************************************/
/* Functions to access unshared data by the shared terms. */
/**************************************************************/
LIST sharing_GetDataList(TERM, SHARED_INDEX);
void sharing_StartDataIterator(TERM, SHARED_INDEX);
POINTER sharing_GetNextData(void);
void sharing_StopDataIterator(void);
LIST sharing_NAtomDataList(TERM);
LIST sharing_GetAllSuperTerms(SHARED_INDEX);
void sharing_ResetAllTermStamps(SHARED_INDEX);
NAT sharing_GetNumberOfOccurances(TERM);
NAT sharing_GetNumberOfInstances(TERM, SHARED_INDEX);
/**************************************************************/
/* Output functions */
/**************************************************************/
void sharing_PrintVartable(SHARED_INDEX);
void sharing_PrintConsttable(SHARED_INDEX);
void sharing_PrintSharing(SHARED_INDEX);
/**************************************************************/
/* Debugging Functions */
/**************************************************************/
void sharing_PrintStack(void);
void sharing_PrintSharingConstterms1(SHARED_INDEX);
void sharing_PrintSharingVarterms1(SHARED_INDEX);
void sharing_PrintSameLevelTerms(TERM);
#endif
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