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/* List management for the GNU C-Compiler expander.
Copyright (C) 1987, 88, 92-97, 1998, 1999 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC 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.
GNU CC 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 GNU CC; 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"
/* 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;
{
register 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 ()
{
static int initialized;
if (!initialized)
{
initialized = 1;
ggc_add_root (&unused_expr_list, 1, 1, zap_lists);
}
unused_expr_list = NULL;
unused_insn_list = NULL;
}
/* 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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