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/* List management for the GNU C-Compiler expander.
Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
1999 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
GCC 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 GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "config.h"
#include "system.h"
#include "toplev.h"
#include "rtl.h"
#include "ggc.h"
static void free_list PARAMS ((rtx *, rtx *));
static void zap_lists PARAMS ((void *));
/* Functions for maintaining cache-able lists of EXPR_LIST and INSN_LISTs. */
/* An INSN_LIST containing all INSN_LISTs allocated but currently unused. */
static rtx unused_insn_list;
/* An EXPR_LIST containing all EXPR_LISTs allocated but currently unused. */
static rtx unused_expr_list;
/* This function will free an entire list of either EXPR_LIST or INSN_LIST
nodes. This is to be used only only lists that consist exclusively of
nodes of one type only. This is only called by free_EXPR_LIST_list
and free_INSN_LIST_list. */
static void
free_list (listp, unused_listp)
rtx *listp, *unused_listp;
{
rtx link, prev_link;
prev_link = *listp;
link = XEXP (prev_link, 1);
while (link)
{
prev_link = link;
link = XEXP (link, 1);
}
XEXP (prev_link, 1) = *unused_listp;
*unused_listp = *listp;
*listp = 0;
}
/* This call is used in place of a gen_rtx_INSN_LIST. If there is a cached
node available, we'll use it, otherwise a call to gen_rtx_INSN_LIST
is made. */
rtx
alloc_INSN_LIST (val, next)
rtx val, next;
{
rtx r;
if (unused_insn_list)
{
r = unused_insn_list;
unused_insn_list = XEXP (r, 1);
XEXP (r, 0) = val;
XEXP (r, 1) = next;
PUT_REG_NOTE_KIND (r, VOIDmode);
}
else
r = gen_rtx_INSN_LIST (VOIDmode, val, next);
return r;
}
/* This call is used in place of a gen_rtx_EXPR_LIST. If there is a cached
node available, we'll use it, otherwise a call to gen_rtx_EXPR_LIST
is made. */
rtx
alloc_EXPR_LIST (kind, val, next)
int kind;
rtx val, next;
{
rtx r;
if (unused_expr_list)
{
r = unused_expr_list;
unused_expr_list = XEXP (r, 1);
XEXP (r, 0) = val;
XEXP (r, 1) = next;
PUT_REG_NOTE_KIND (r, kind);
}
else
r = gen_rtx_EXPR_LIST (kind, val, next);
return r;
}
/* This function will initialize the EXPR_LIST and INSN_LIST caches. */
static void
zap_lists (dummy)
void *dummy ATTRIBUTE_UNUSED;
{
unused_expr_list = NULL;
unused_insn_list = NULL;
}
void
init_EXPR_INSN_LIST_cache ()
{
ggc_add_root (&unused_expr_list, 1, 1, zap_lists);
}
/* This function will free up an entire list of EXPR_LIST nodes. */
void
free_EXPR_LIST_list (listp)
rtx *listp;
{
if (*listp == 0)
return;
free_list (listp, &unused_expr_list);
}
/* This function will free up an entire list of INSN_LIST nodes. */
void
free_INSN_LIST_list (listp)
rtx *listp;
{
if (*listp == 0)
return;
free_list (listp, &unused_insn_list);
}
/* This function will free up an individual EXPR_LIST node. */
void
free_EXPR_LIST_node (ptr)
rtx ptr;
{
XEXP (ptr, 1) = unused_expr_list;
unused_expr_list = ptr;
}
/* This function will free up an individual INSN_LIST node. */
void
free_INSN_LIST_node (ptr)
rtx ptr;
{
XEXP (ptr, 1) = unused_insn_list;
unused_insn_list = ptr;
}
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