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