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fecd2382 | 1 | /* cond.c - conditional assembly pseudo-ops, and .include |
075e616c ILT |
2 | Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc. |
3 | ||
a39116f1 | 4 | This file is part of GAS, the GNU Assembler. |
075e616c | 5 | |
a39116f1 RP |
6 | GAS 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. | |
075e616c | 10 | |
a39116f1 RP |
11 | GAS 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. | |
075e616c | 15 | |
a39116f1 RP |
16 | You should have received a copy of the GNU General Public License |
17 | along with GAS; see the file COPYING. If not, write to | |
075e616c | 18 | the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
fecd2382 | 19 | |
a39116f1 | 20 | #include "as.h" |
fecd2382 | 21 | |
a39116f1 | 22 | #include "obstack.h" |
fecd2382 | 23 | |
a39116f1 RP |
24 | /* This is allocated to grow and shrink as .ifdef/.endif pairs are scanned. */ |
25 | struct obstack cond_obstack; | |
fecd2382 | 26 | |
075e616c ILT |
27 | struct file_line |
28 | { | |
29 | char *file; | |
30 | unsigned int line; | |
31 | }; /* file_line */ | |
fecd2382 | 32 | |
a39116f1 | 33 | /* This is what we push and pop. */ |
075e616c ILT |
34 | struct conditional_frame |
35 | { | |
36 | struct file_line if_file_line; /* the source file & line number of the "if" */ | |
37 | struct file_line else_file_line; /* the source file & line of the "else" */ | |
38 | struct conditional_frame *previous_cframe; | |
39 | int else_seen; /* have we seen an else yet? */ | |
40 | int ignoring; /* if we are currently ignoring input. */ | |
41 | int dead_tree; /* if a conditional at a higher level is ignoring input. */ | |
42 | }; /* conditional_frame */ | |
fecd2382 | 43 | |
075e616c ILT |
44 | static void initialize_cframe PARAMS ((struct conditional_frame *cframe)); |
45 | static char *get_mri_string PARAMS ((int, int *)); | |
fecd2382 | 46 | |
075e616c | 47 | static struct conditional_frame *current_cframe = NULL; |
a39116f1 | 48 | |
075e616c ILT |
49 | void |
50 | s_ifdef (arg) | |
51 | int arg; | |
52 | { | |
53 | register char *name; /* points to name of symbol */ | |
54 | register struct symbol *symbolP; /* Points to symbol */ | |
55 | struct conditional_frame cframe; | |
a39116f1 | 56 | |
075e616c ILT |
57 | SKIP_WHITESPACE (); /* Leading whitespace is part of operand. */ |
58 | name = input_line_pointer; | |
a39116f1 | 59 | |
075e616c ILT |
60 | if (!is_name_beginner (*name)) |
61 | { | |
62 | as_bad ("invalid identifier for \".ifdef\""); | |
63 | obstack_1grow (&cond_obstack, 0); | |
64 | } | |
65 | else | |
66 | { | |
67 | get_symbol_end (); | |
68 | ++input_line_pointer; | |
69 | symbolP = symbol_find (name); | |
a39116f1 | 70 | |
075e616c ILT |
71 | initialize_cframe (&cframe); |
72 | cframe.ignoring = cframe.dead_tree || !((symbolP != 0) ^ arg); | |
73 | current_cframe = (struct conditional_frame *) obstack_copy (&cond_obstack, &cframe, sizeof (cframe)); | |
74 | } /* if a valid identifyer name */ | |
fecd2382 | 75 | |
075e616c ILT |
76 | return; |
77 | } /* s_ifdef() */ | |
78 | ||
79 | void | |
80 | s_if (arg) | |
81 | int arg; | |
fecd2382 | 82 | { |
075e616c ILT |
83 | expressionS operand; |
84 | struct conditional_frame cframe; | |
85 | int t; | |
86 | ||
87 | SKIP_WHITESPACE (); /* Leading whitespace is part of operand. */ | |
88 | expression (&operand); | |
89 | ||
90 | if (operand.X_op != O_constant) | |
91 | as_bad ("non-constant expression in \".if\" statement"); | |
92 | ||
93 | switch ((operatorT) arg) | |
94 | { | |
95 | case O_eq: t = operand.X_add_number == 0; break; | |
96 | case O_ne: t = operand.X_add_number != 0; break; | |
97 | case O_lt: t = operand.X_add_number < 0; break; | |
98 | case O_le: t = operand.X_add_number <= 0; break; | |
99 | case O_ge: t = operand.X_add_number >= 0; break; | |
100 | case O_gt: t = operand.X_add_number > 0; break; | |
101 | default: | |
102 | abort (); | |
103 | } | |
104 | ||
105 | /* If the above error is signaled, this will dispatch | |
106 | using an undefined result. No big deal. */ | |
107 | initialize_cframe (&cframe); | |
108 | cframe.ignoring = cframe.dead_tree || ! t; | |
109 | current_cframe = ((struct conditional_frame *) | |
110 | obstack_copy (&cond_obstack, &cframe, sizeof (cframe))); | |
111 | return; | |
112 | } /* s_if() */ | |
113 | ||
114 | /* Get a string for the MRI IFC or IFNC pseudo-ops. */ | |
115 | ||
116 | static char * | |
117 | get_mri_string (terminator, len) | |
118 | int terminator; | |
119 | int *len; | |
fecd2382 | 120 | { |
075e616c ILT |
121 | char *ret; |
122 | char *s; | |
123 | ||
124 | SKIP_WHITESPACE (); | |
125 | s = ret = input_line_pointer; | |
126 | if (*input_line_pointer == '\'') | |
127 | { | |
128 | ++s; | |
129 | ++input_line_pointer; | |
130 | while (! is_end_of_line[(unsigned char) *input_line_pointer]) | |
131 | { | |
132 | *s++ = *input_line_pointer++; | |
133 | if (s[-1] == '\'') | |
134 | { | |
135 | if (*input_line_pointer != '\'') | |
136 | break; | |
137 | ++input_line_pointer; | |
138 | } | |
139 | } | |
140 | SKIP_WHITESPACE (); | |
141 | } | |
142 | else | |
143 | { | |
144 | while (*input_line_pointer != terminator | |
145 | && ! is_end_of_line[(unsigned char) *input_line_pointer]) | |
146 | ++input_line_pointer; | |
147 | s = input_line_pointer; | |
148 | while (s > ret && (s[-1] == ' ' || s[-1] == '\t')) | |
149 | --s; | |
150 | } | |
151 | ||
152 | *len = s - ret; | |
153 | return ret; | |
154 | } | |
155 | ||
156 | /* The MRI IFC and IFNC pseudo-ops. */ | |
157 | ||
158 | void | |
159 | s_ifc (arg) | |
160 | int arg; | |
fecd2382 | 161 | { |
075e616c ILT |
162 | char *s1, *s2; |
163 | int len1, len2; | |
164 | int res; | |
165 | struct conditional_frame cframe; | |
166 | ||
167 | s1 = get_mri_string (',', &len1); | |
168 | ||
169 | if (*input_line_pointer != ',') | |
170 | as_bad ("bad format for ifc or ifnc"); | |
171 | else | |
172 | ++input_line_pointer; | |
173 | ||
174 | s2 = get_mri_string (';', &len2); | |
175 | ||
176 | res = len1 == len2 && strncmp (s1, s2, len1) == 0; | |
177 | ||
178 | initialize_cframe (&cframe); | |
179 | cframe.ignoring = cframe.dead_tree || ! (res ^ arg); | |
180 | current_cframe = ((struct conditional_frame *) | |
181 | obstack_copy (&cond_obstack, &cframe, sizeof (cframe))); | |
182 | } | |
183 | ||
184 | void | |
185 | s_endif (arg) | |
186 | int arg; | |
fecd2382 | 187 | { |
075e616c | 188 | struct conditional_frame *hold; |
fecd2382 | 189 | |
075e616c ILT |
190 | if (current_cframe == NULL) |
191 | { | |
192 | as_bad ("\".endif\" without \".if\""); | |
193 | } | |
194 | else | |
195 | { | |
196 | hold = current_cframe; | |
197 | current_cframe = current_cframe->previous_cframe; | |
198 | obstack_free (&cond_obstack, hold); | |
199 | } /* if one pop too many */ | |
200 | ||
201 | return; | |
202 | } /* s_endif() */ | |
203 | ||
204 | void | |
205 | s_else (arg) | |
206 | int arg; | |
fecd2382 | 207 | { |
075e616c ILT |
208 | if (current_cframe == NULL) |
209 | { | |
210 | as_bad (".else without matching .if - ignored"); | |
211 | ||
212 | } | |
213 | else if (current_cframe->else_seen) | |
214 | { | |
215 | as_bad ("duplicate \"else\" - ignored"); | |
216 | as_bad_where (current_cframe->else_file_line.file, | |
217 | current_cframe->else_file_line.line, | |
218 | "here is the previous \"else\""); | |
219 | as_bad_where (current_cframe->if_file_line.file, | |
220 | current_cframe->if_file_line.line, | |
221 | "here is the previous \"if\""); | |
222 | } | |
223 | else | |
224 | { | |
225 | as_where (¤t_cframe->else_file_line.file, | |
226 | ¤t_cframe->else_file_line.line); | |
227 | ||
228 | if (!current_cframe->dead_tree) | |
229 | { | |
230 | current_cframe->ignoring = !current_cframe->ignoring; | |
231 | } /* if not a dead tree */ | |
fecd2382 | 232 | |
075e616c ILT |
233 | current_cframe->else_seen = 1; |
234 | } /* if error else do it */ | |
235 | ||
236 | return; | |
237 | } /* s_else() */ | |
238 | ||
239 | void | |
240 | s_ifeqs (arg) | |
241 | int arg; | |
a39116f1 | 242 | { |
075e616c ILT |
243 | as_bad ("ifeqs not implemented."); |
244 | ||
245 | return; | |
246 | } /* s_ifeqs() */ | |
247 | ||
248 | int | |
249 | ignore_input () | |
a39116f1 | 250 | { |
075e616c ILT |
251 | char *s; |
252 | ||
253 | s = input_line_pointer; | |
254 | ||
255 | if (flag_mri | |
256 | #ifdef NO_PSEUDO_DOT | |
257 | || 1 | |
258 | #endif | |
259 | ) | |
260 | { | |
261 | if (s[-1] != '.') | |
262 | --s; | |
263 | } | |
264 | else | |
265 | { | |
266 | if (s[-1] != '.') | |
267 | return (current_cframe != NULL) && (current_cframe->ignoring); | |
268 | } | |
269 | ||
270 | /* We cannot ignore certain pseudo ops. */ | |
271 | if ((s[0] == 'i' | |
272 | && (!strncmp (s, "if", 2) | |
273 | || !strncmp (s, "ifdef", 5) | |
274 | || !strncmp (s, "ifndef", 6))) | |
275 | || (s[0] == 'e' | |
276 | && (!strncmp (s, "else", 4) | |
277 | || !strncmp (s, "endif", 5) | |
278 | || !strncmp (s, "endc", 4)))) | |
279 | return 0; | |
280 | ||
281 | return (current_cframe != NULL) && (current_cframe->ignoring); | |
282 | } /* ignore_input() */ | |
283 | ||
284 | static void | |
285 | initialize_cframe (cframe) | |
286 | struct conditional_frame *cframe; | |
a39116f1 | 287 | { |
075e616c ILT |
288 | memset (cframe, 0, sizeof (*cframe)); |
289 | as_where (&cframe->if_file_line.file, | |
290 | &cframe->if_file_line.line); | |
291 | cframe->previous_cframe = current_cframe; | |
292 | cframe->dead_tree = current_cframe != NULL && current_cframe->ignoring; | |
293 | ||
294 | return; | |
295 | } /* initialize_cframe() */ | |
a39116f1 RP |
296 | |
297 | /* | |
298 | * Local Variables: | |
299 | * fill-column: 131 | |
300 | * comment-column: 0 | |
301 | * End: | |
302 | */ | |
303 | ||
fecd2382 | 304 | /* end of cond.c */ |