164 lines
3.8 KiB
C
164 lines
3.8 KiB
C
/* 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;
|
|
}
|