]>
Commit | Line | Data |
---|---|---|
5a4f6418 | 1 | /* List management for the GNU C-Compiler expander. |
d050d723 JL |
2 | Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
3 | 1999 Free Software Foundation, Inc. | |
5a4f6418 | 4 | |
1322177d | 5 | This file is part of GCC. |
5a4f6418 | 6 | |
1322177d LB |
7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
5a4f6418 | 11 | |
1322177d LB |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
5a4f6418 AM |
16 | |
17 | You should have received a copy of the GNU General Public License | |
1322177d LB |
18 | along with GCC; see the file COPYING. If not, write to the Free |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
5a4f6418 AM |
21 | |
22 | #include "config.h" | |
23 | #include "system.h" | |
24 | #include "toplev.h" | |
25 | #include "rtl.h" | |
7cf3d8b4 | 26 | #include "ggc.h" |
5a4f6418 | 27 | |
ca3075bd KG |
28 | static void free_list PARAMS ((rtx *, rtx *)); |
29 | static void zap_lists PARAMS ((void *)); | |
30 | ||
5a4f6418 AM |
31 | /* Functions for maintaining cache-able lists of EXPR_LIST and INSN_LISTs. */ |
32 | ||
33 | /* An INSN_LIST containing all INSN_LISTs allocated but currently unused. */ | |
34 | static rtx unused_insn_list; | |
35 | ||
36 | /* An EXPR_LIST containing all EXPR_LISTs allocated but currently unused. */ | |
37 | static rtx unused_expr_list; | |
38 | ||
39 | ||
40 | /* This function will free an entire list of either EXPR_LIST or INSN_LIST | |
41 | nodes. This is to be used only only lists that consist exclusively of | |
42 | nodes of one type only. This is only called by free_EXPR_LIST_list | |
43 | and free_INSN_LIST_list. */ | |
44 | static void | |
45 | free_list (listp, unused_listp) | |
46 | rtx *listp, *unused_listp; | |
47 | { | |
48 | register rtx link, prev_link; | |
49 | ||
50 | prev_link = *listp; | |
51 | link = XEXP (prev_link, 1); | |
52 | ||
53 | while (link) | |
54 | { | |
55 | prev_link = link; | |
56 | link = XEXP (link, 1); | |
57 | } | |
58 | ||
59 | XEXP (prev_link, 1) = *unused_listp; | |
60 | *unused_listp = *listp; | |
61 | *listp = 0; | |
62 | } | |
63 | ||
64 | /* This call is used in place of a gen_rtx_INSN_LIST. If there is a cached | |
65 | node available, we'll use it, otherwise a call to gen_rtx_INSN_LIST | |
66 | is made. */ | |
67 | rtx | |
68 | alloc_INSN_LIST (val, next) | |
69 | rtx val, next; | |
70 | { | |
71 | rtx r; | |
72 | ||
73 | if (unused_insn_list) | |
74 | { | |
75 | r = unused_insn_list; | |
76 | unused_insn_list = XEXP (r, 1); | |
77 | XEXP (r, 0) = val; | |
78 | XEXP (r, 1) = next; | |
79 | PUT_REG_NOTE_KIND (r, VOIDmode); | |
80 | } | |
81 | else | |
82 | r = gen_rtx_INSN_LIST (VOIDmode, val, next); | |
83 | ||
84 | return r; | |
85 | } | |
86 | ||
87 | /* This call is used in place of a gen_rtx_EXPR_LIST. If there is a cached | |
88 | node available, we'll use it, otherwise a call to gen_rtx_EXPR_LIST | |
89 | is made. */ | |
90 | rtx | |
91 | alloc_EXPR_LIST (kind, val, next) | |
92 | int kind; | |
93 | rtx val, next; | |
94 | { | |
95 | rtx r; | |
96 | ||
97 | if (unused_expr_list) | |
98 | { | |
99 | r = unused_expr_list; | |
100 | unused_expr_list = XEXP (r, 1); | |
101 | XEXP (r, 0) = val; | |
102 | XEXP (r, 1) = next; | |
103 | PUT_REG_NOTE_KIND (r, kind); | |
104 | } | |
105 | else | |
106 | r = gen_rtx_EXPR_LIST (kind, val, next); | |
107 | ||
108 | return r; | |
109 | } | |
110 | ||
111 | /* This function will initialize the EXPR_LIST and INSN_LIST caches. */ | |
7cf3d8b4 RH |
112 | |
113 | static void | |
114 | zap_lists (dummy) | |
115 | void *dummy ATTRIBUTE_UNUSED; | |
116 | { | |
117 | unused_expr_list = NULL; | |
118 | unused_insn_list = NULL; | |
119 | } | |
120 | ||
5a4f6418 AM |
121 | void |
122 | init_EXPR_INSN_LIST_cache () | |
123 | { | |
232f749b | 124 | ggc_add_root (&unused_expr_list, 1, 1, zap_lists); |
5a4f6418 AM |
125 | } |
126 | ||
127 | /* This function will free up an entire list of EXPR_LIST nodes. */ | |
128 | void | |
129 | free_EXPR_LIST_list (listp) | |
130 | rtx *listp; | |
131 | { | |
132 | if (*listp == 0) | |
133 | return; | |
134 | free_list (listp, &unused_expr_list); | |
135 | } | |
136 | ||
137 | /* This function will free up an entire list of INSN_LIST nodes. */ | |
138 | void | |
139 | free_INSN_LIST_list (listp) | |
140 | rtx *listp; | |
141 | { | |
142 | if (*listp == 0) | |
143 | return; | |
144 | free_list (listp, &unused_insn_list); | |
145 | } | |
146 | ||
147 | /* This function will free up an individual EXPR_LIST node. */ | |
148 | void | |
149 | free_EXPR_LIST_node (ptr) | |
150 | rtx ptr; | |
151 | { | |
152 | XEXP (ptr, 1) = unused_expr_list; | |
153 | unused_expr_list = ptr; | |
154 | } | |
155 | ||
156 | /* This function will free up an individual INSN_LIST node. */ | |
157 | void | |
158 | free_INSN_LIST_node (ptr) | |
159 | rtx ptr; | |
160 | { | |
161 | XEXP (ptr, 1) = unused_insn_list; | |
162 | unused_insn_list = ptr; | |
163 | } |