1 | /* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack. |
---|
2 | Copyright (C) 1992, 1997 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 <stdio.h> |
---|
23 | #include "tree.h" |
---|
24 | #include "except.h" |
---|
25 | #include "function.h" |
---|
26 | #include "defaults.h" |
---|
27 | #include "c-pragma.h" |
---|
28 | |
---|
29 | #ifdef HANDLE_SYSV_PRAGMA |
---|
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 state = ps_start, type; |
---|
49 | static char *name; |
---|
50 | static char *value; |
---|
51 | static int align; |
---|
52 | |
---|
53 | if (string == 0) |
---|
54 | { |
---|
55 | if (type == ps_pack) |
---|
56 | { |
---|
57 | if (state == ps_right) |
---|
58 | maximum_field_alignment = align * 8; |
---|
59 | else |
---|
60 | warning ("malformed `#pragma pack'"); |
---|
61 | } |
---|
62 | else if (type == ps_weak) |
---|
63 | { |
---|
64 | #ifdef HANDLE_PRAGMA_WEAK |
---|
65 | if (HANDLE_PRAGMA_WEAK) |
---|
66 | handle_pragma_weak (state, name, value); |
---|
67 | |
---|
68 | #endif /* HANDLE_PRAGMA_WEAK */ |
---|
69 | } |
---|
70 | |
---|
71 | type = state = ps_start; |
---|
72 | return; |
---|
73 | } |
---|
74 | |
---|
75 | switch (state) |
---|
76 | { |
---|
77 | case ps_start: |
---|
78 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) |
---|
79 | { |
---|
80 | if (strcmp (IDENTIFIER_POINTER (token), "pack") == 0) |
---|
81 | type = state = ps_pack; |
---|
82 | else if (strcmp (IDENTIFIER_POINTER (token), "weak") == 0) |
---|
83 | type = state = ps_weak; |
---|
84 | else |
---|
85 | type = state = ps_done; |
---|
86 | } |
---|
87 | else |
---|
88 | type = state = ps_done; |
---|
89 | break; |
---|
90 | |
---|
91 | case ps_weak: |
---|
92 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) |
---|
93 | { |
---|
94 | name = IDENTIFIER_POINTER (token); |
---|
95 | state = ps_name; |
---|
96 | } |
---|
97 | else |
---|
98 | state = ps_bad; |
---|
99 | break; |
---|
100 | |
---|
101 | case ps_name: |
---|
102 | state = (strcmp (string, "=") ? ps_bad : ps_equals); |
---|
103 | break; |
---|
104 | |
---|
105 | case ps_equals: |
---|
106 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) |
---|
107 | { |
---|
108 | value = IDENTIFIER_POINTER (token); |
---|
109 | state = ps_value; |
---|
110 | } |
---|
111 | else |
---|
112 | state = ps_bad; |
---|
113 | break; |
---|
114 | |
---|
115 | case ps_value: |
---|
116 | state = ps_bad; |
---|
117 | break; |
---|
118 | |
---|
119 | case ps_pack: |
---|
120 | if (strcmp (string, "(") == 0) |
---|
121 | state = ps_left; |
---|
122 | else |
---|
123 | state = ps_bad; |
---|
124 | break; |
---|
125 | |
---|
126 | case ps_left: |
---|
127 | if (token && TREE_CODE (token) == INTEGER_CST |
---|
128 | && TREE_INT_CST_HIGH (token) == 0) |
---|
129 | switch (TREE_INT_CST_LOW (token)) |
---|
130 | { |
---|
131 | case 1: |
---|
132 | case 2: |
---|
133 | case 4: |
---|
134 | align = TREE_INT_CST_LOW (token); |
---|
135 | state = ps_align; |
---|
136 | break; |
---|
137 | |
---|
138 | default: |
---|
139 | state = ps_bad; |
---|
140 | } |
---|
141 | else if (! token && strcmp (string, ")") == 0) |
---|
142 | { |
---|
143 | align = 0; |
---|
144 | state = ps_right; |
---|
145 | } |
---|
146 | else |
---|
147 | state = ps_bad; |
---|
148 | break; |
---|
149 | |
---|
150 | case ps_align: |
---|
151 | if (strcmp (string, ")") == 0) |
---|
152 | state = ps_right; |
---|
153 | else |
---|
154 | state = ps_bad; |
---|
155 | break; |
---|
156 | |
---|
157 | case ps_right: |
---|
158 | state = ps_bad; |
---|
159 | break; |
---|
160 | |
---|
161 | case ps_bad: |
---|
162 | case ps_done: |
---|
163 | break; |
---|
164 | |
---|
165 | default: |
---|
166 | abort (); |
---|
167 | } |
---|
168 | } |
---|
169 | #endif /* HANDLE_SYSV_PRAGMA */ |
---|