1 /* List management for the GNU C-Compiler expander.
2 Copyright (C) 1987, 88, 92-97, 1998, 1999 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
26 /* Functions for maintaining cache-able lists of EXPR_LIST and INSN_LISTs. */
28 /* An INSN_LIST containing all INSN_LISTs allocated but currently unused. */
29 static rtx unused_insn_list;
31 /* An EXPR_LIST containing all EXPR_LISTs allocated but currently unused. */
32 static rtx unused_expr_list;
35 /* This function will free an entire list of either EXPR_LIST or INSN_LIST
36 nodes. This is to be used only only lists that consist exclusively of
37 nodes of one type only. This is only called by free_EXPR_LIST_list
38 and free_INSN_LIST_list. */
40 free_list (listp, unused_listp)
41 rtx *listp, *unused_listp;
43 register rtx link, prev_link;
46 link = XEXP (prev_link, 1);
51 link = XEXP (link, 1);
54 XEXP (prev_link, 1) = *unused_listp;
55 *unused_listp = *listp;
59 /* This call is used in place of a gen_rtx_INSN_LIST. If there is a cached
60 node available, we'll use it, otherwise a call to gen_rtx_INSN_LIST
63 alloc_INSN_LIST (val, next)
71 unused_insn_list = XEXP (r, 1);
74 PUT_REG_NOTE_KIND (r, VOIDmode);
77 r = gen_rtx_INSN_LIST (VOIDmode, val, next);
82 /* This call is used in place of a gen_rtx_EXPR_LIST. If there is a cached
83 node available, we'll use it, otherwise a call to gen_rtx_EXPR_LIST
86 alloc_EXPR_LIST (kind, val, next)
95 unused_expr_list = XEXP (r, 1);
98 PUT_REG_NOTE_KIND (r, kind);
101 r = gen_rtx_EXPR_LIST (kind, val, next);
106 /* This function will initialize the EXPR_LIST and INSN_LIST caches. */
108 init_EXPR_INSN_LIST_cache ()
110 unused_expr_list = NULL;
111 unused_insn_list = NULL;
114 /* This function will free up an entire list of EXPR_LIST nodes. */
116 free_EXPR_LIST_list (listp)
121 free_list (listp, &unused_expr_list);
124 /* This function will free up an entire list of INSN_LIST nodes. */
126 free_INSN_LIST_list (listp)
131 free_list (listp, &unused_insn_list);
134 /* This function will free up an individual EXPR_LIST node. */
136 free_EXPR_LIST_node (ptr)
139 XEXP (ptr, 1) = unused_expr_list;
140 unused_expr_list = ptr;
143 /* This function will free up an individual INSN_LIST node. */
145 free_INSN_LIST_node (ptr)
148 XEXP (ptr, 1) = unused_insn_list;
149 unused_insn_list = ptr;