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6284c5cd | 1 | /* List management for the GNU C-Compiler expander. |
2 | Copyright (C) 1987, 88, 92-97, 1998, 1999 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GNU CC. | |
5 | ||
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) | |
9 | any later version. | |
10 | ||
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. | |
15 | ||
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. */ | |
20 | ||
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "toplev.h" | |
24 | #include "rtl.h" | |
d8fcbd1d | 25 | #include "ggc.h" |
6284c5cd | 26 | |
27 | /* Functions for maintaining cache-able lists of EXPR_LIST and INSN_LISTs. */ | |
28 | ||
29 | /* An INSN_LIST containing all INSN_LISTs allocated but currently unused. */ | |
30 | static rtx unused_insn_list; | |
31 | ||
32 | /* An EXPR_LIST containing all EXPR_LISTs allocated but currently unused. */ | |
33 | static rtx unused_expr_list; | |
34 | ||
35 | ||
36 | /* This function will free an entire list of either EXPR_LIST or INSN_LIST | |
37 | nodes. This is to be used only only lists that consist exclusively of | |
38 | nodes of one type only. This is only called by free_EXPR_LIST_list | |
39 | and free_INSN_LIST_list. */ | |
40 | static void | |
41 | free_list (listp, unused_listp) | |
42 | rtx *listp, *unused_listp; | |
43 | { | |
44 | register rtx link, prev_link; | |
45 | ||
46 | prev_link = *listp; | |
47 | link = XEXP (prev_link, 1); | |
48 | ||
49 | while (link) | |
50 | { | |
51 | prev_link = link; | |
52 | link = XEXP (link, 1); | |
53 | } | |
54 | ||
55 | XEXP (prev_link, 1) = *unused_listp; | |
56 | *unused_listp = *listp; | |
57 | *listp = 0; | |
58 | } | |
59 | ||
60 | /* This call is used in place of a gen_rtx_INSN_LIST. If there is a cached | |
61 | node available, we'll use it, otherwise a call to gen_rtx_INSN_LIST | |
62 | is made. */ | |
63 | rtx | |
64 | alloc_INSN_LIST (val, next) | |
65 | rtx val, next; | |
66 | { | |
67 | rtx r; | |
68 | ||
69 | if (unused_insn_list) | |
70 | { | |
71 | r = unused_insn_list; | |
72 | unused_insn_list = XEXP (r, 1); | |
73 | XEXP (r, 0) = val; | |
74 | XEXP (r, 1) = next; | |
75 | PUT_REG_NOTE_KIND (r, VOIDmode); | |
76 | } | |
77 | else | |
78 | r = gen_rtx_INSN_LIST (VOIDmode, val, next); | |
79 | ||
80 | return r; | |
81 | } | |
82 | ||
83 | /* This call is used in place of a gen_rtx_EXPR_LIST. If there is a cached | |
84 | node available, we'll use it, otherwise a call to gen_rtx_EXPR_LIST | |
85 | is made. */ | |
86 | rtx | |
87 | alloc_EXPR_LIST (kind, val, next) | |
88 | int kind; | |
89 | rtx val, next; | |
90 | { | |
91 | rtx r; | |
92 | ||
93 | if (unused_expr_list) | |
94 | { | |
95 | r = unused_expr_list; | |
96 | unused_expr_list = XEXP (r, 1); | |
97 | XEXP (r, 0) = val; | |
98 | XEXP (r, 1) = next; | |
99 | PUT_REG_NOTE_KIND (r, kind); | |
100 | } | |
101 | else | |
102 | r = gen_rtx_EXPR_LIST (kind, val, next); | |
103 | ||
104 | return r; | |
105 | } | |
106 | ||
107 | /* This function will initialize the EXPR_LIST and INSN_LIST caches. */ | |
d8fcbd1d | 108 | |
109 | static void | |
110 | zap_lists (dummy) | |
111 | void *dummy ATTRIBUTE_UNUSED; | |
112 | { | |
113 | unused_expr_list = NULL; | |
114 | unused_insn_list = NULL; | |
115 | } | |
116 | ||
6284c5cd | 117 | void |
118 | init_EXPR_INSN_LIST_cache () | |
119 | { | |
d8fcbd1d | 120 | static int initialized; |
121 | if (!initialized) | |
122 | { | |
123 | initialized = 1; | |
124 | ggc_add_root (&unused_expr_list, 1, 1, zap_lists); | |
125 | } | |
126 | ||
6284c5cd | 127 | unused_expr_list = NULL; |
128 | unused_insn_list = NULL; | |
129 | } | |
130 | ||
131 | /* This function will free up an entire list of EXPR_LIST nodes. */ | |
132 | void | |
133 | free_EXPR_LIST_list (listp) | |
134 | rtx *listp; | |
135 | { | |
136 | if (*listp == 0) | |
137 | return; | |
138 | free_list (listp, &unused_expr_list); | |
139 | } | |
140 | ||
141 | /* This function will free up an entire list of INSN_LIST nodes. */ | |
142 | void | |
143 | free_INSN_LIST_list (listp) | |
144 | rtx *listp; | |
145 | { | |
146 | if (*listp == 0) | |
147 | return; | |
148 | free_list (listp, &unused_insn_list); | |
149 | } | |
150 | ||
151 | /* This function will free up an individual EXPR_LIST node. */ | |
152 | void | |
153 | free_EXPR_LIST_node (ptr) | |
154 | rtx ptr; | |
155 | { | |
156 | XEXP (ptr, 1) = unused_expr_list; | |
157 | unused_expr_list = ptr; | |
158 | } | |
159 | ||
160 | /* This function will free up an individual INSN_LIST node. */ | |
161 | void | |
162 | free_INSN_LIST_node (ptr) | |
163 | rtx ptr; | |
164 | { | |
165 | XEXP (ptr, 1) = unused_insn_list; | |
166 | unused_insn_list = ptr; | |
167 | } |