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9bf86ebb PR |
1 | /* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack. |
2 | Copyright (C) 1992 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, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include <stdio.h> | |
21 | #include "config.h" | |
22 | #include "tree.h" | |
23 | ||
24 | #ifdef HANDLE_SYSV_PRAGMA | |
25 | ||
26 | /* Support #pragma weak by default if WEAK_ASM_OP is defined. */ | |
27 | #if !defined (HANDLE_PRAGMA_WEAK) && defined (WEAK_ASM_OP) && defined (SET_ASM_OP) | |
28 | #define HANDLE_PRAGMA_WEAK 1 | |
29 | #endif | |
30 | ||
31 | /* When structure field packing is in effect, this variable is the | |
32 | number of bits to use as the maximum alignment. When packing is not | |
33 | in effect, this is zero. */ | |
34 | ||
35 | extern int maximum_field_alignment; | |
36 | ||
37 | /* File used for outputting assembler code. */ | |
38 | extern FILE *asm_out_file; | |
39 | ||
40 | /* Handle one token of a pragma directive. TOKEN is the | |
41 | current token, and STRING is its printable form. */ | |
42 | ||
43 | void | |
44 | handle_pragma_token (string, token) | |
45 | char *string; | |
46 | tree token; | |
47 | { | |
48 | static enum pragma_state | |
49 | { | |
50 | ps_start, | |
51 | ps_done, | |
52 | ps_bad, | |
53 | ps_weak, | |
54 | ps_name, | |
55 | ps_equals, | |
56 | ps_value, | |
57 | ps_pack, | |
58 | ps_left, | |
59 | ps_align, | |
60 | ps_right | |
61 | } state = ps_start, type; | |
62 | static char *name; | |
63 | static char *value; | |
64 | static int align; | |
65 | ||
66 | if (string == 0) | |
67 | { | |
68 | if (type == ps_pack) | |
69 | { | |
70 | if (state == ps_right) | |
71 | maximum_field_alignment = align * 8; | |
72 | else | |
73 | warning ("malformed `#pragma pack'"); | |
74 | } | |
75 | else if (type == ps_weak) | |
76 | { | |
77 | #ifdef HANDLE_PRAGMA_WEAK | |
78 | if (HANDLE_PRAGMA_WEAK) | |
79 | { | |
80 | if (state == ps_name || state == ps_value) | |
81 | { | |
82 | fprintf (asm_out_file, "\t%s\t", WEAK_ASM_OP); | |
83 | ASM_OUTPUT_LABELREF (asm_out_file, name); | |
84 | fputc ('\n', asm_out_file); | |
85 | if (state == ps_value) | |
86 | { | |
87 | fprintf (asm_out_file, "\t%s\t", SET_ASM_OP); | |
88 | ASM_OUTPUT_LABELREF (asm_out_file, name); | |
89 | fputc (',', asm_out_file); | |
90 | ASM_OUTPUT_LABELREF (asm_out_file, value); | |
91 | fputc ('\n', asm_out_file); | |
92 | } | |
93 | } | |
94 | else if (! (state == ps_done || state == ps_start)) | |
95 | warning ("malformed `#pragma weak'"); | |
96 | } | |
97 | #endif /* HANDLE_PRAMA_WEAK */ | |
98 | } | |
99 | ||
100 | type = state = ps_start; | |
101 | return; | |
102 | } | |
103 | ||
104 | switch (state) | |
105 | { | |
106 | case ps_start: | |
107 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) | |
108 | { | |
109 | if (strcmp (IDENTIFIER_POINTER (token), "pack") == 0) | |
110 | type = state = ps_pack; | |
111 | else if (strcmp (IDENTIFIER_POINTER (token), "weak") == 0) | |
112 | type = state = ps_weak; | |
113 | else | |
114 | type = state = ps_done; | |
115 | } | |
116 | else | |
117 | type = state = ps_done; | |
118 | break; | |
119 | ||
120 | case ps_weak: | |
121 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) | |
122 | { | |
123 | name = IDENTIFIER_POINTER (token); | |
124 | state = ps_name; | |
125 | } | |
126 | else | |
127 | state = ps_bad; | |
128 | break; | |
129 | ||
130 | case ps_name: | |
131 | state = (strcmp (string, "=") ? ps_bad : ps_equals); | |
132 | break; | |
133 | ||
134 | case ps_equals: | |
135 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) | |
136 | { | |
137 | value = IDENTIFIER_POINTER (token); | |
138 | state = ps_value; | |
139 | } | |
140 | else | |
141 | state = ps_bad; | |
142 | break; | |
143 | ||
144 | case ps_value: | |
145 | state = ps_bad; | |
146 | break; | |
147 | ||
148 | case ps_pack: | |
149 | if (strcmp (string, "(") == 0) | |
150 | state = ps_left; | |
151 | else | |
152 | state = ps_bad; | |
153 | break; | |
154 | ||
155 | case ps_left: | |
156 | if (token && TREE_CODE (token) == INTEGER_CST | |
157 | && TREE_INT_CST_HIGH (token) == 0) | |
158 | switch (TREE_INT_CST_LOW (token)) | |
159 | { | |
160 | case 1: | |
161 | case 2: | |
162 | case 4: | |
163 | align = TREE_INT_CST_LOW (token); | |
164 | state = ps_align; | |
165 | break; | |
166 | ||
167 | default: | |
168 | state = ps_bad; | |
169 | } | |
170 | else if (! token && strcmp (string, ")") == 0) | |
171 | { | |
172 | align = 0; | |
173 | state = ps_right; | |
174 | } | |
175 | else | |
176 | state = ps_bad; | |
177 | break; | |
178 | ||
179 | case ps_align: | |
180 | if (strcmp (string, ")") == 0) | |
181 | state = ps_right; | |
182 | else | |
183 | state = ps_bad; | |
184 | break; | |
185 | ||
186 | case ps_right: | |
187 | state = ps_bad; | |
188 | break; | |
189 | ||
190 | case ps_bad: | |
191 | case ps_done: | |
192 | break; | |
193 | ||
194 | default: | |
195 | abort (); | |
196 | } | |
197 | } | |
198 | #endif /* HANDLE_SYSV_PRAGMA */ |