Commit | Line | Data |
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252b5132 | 1 | /* input_scrub.c - Break up input buffers into whole numbers of lines. |
f7e42eb4 | 2 | Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
ebd1c875 | 3 | 2000, 2001, 2003, 2006 |
252b5132 RH |
4 | Free Software Foundation, Inc. |
5 | ||
6 | This file is part of GAS, the GNU Assembler. | |
7 | ||
8 | GAS is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2, or (at your option) | |
11 | any later version. | |
12 | ||
13 | GAS is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GAS; see the file COPYING. If not, write to the Free | |
4b4da160 NC |
20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
21 | 02110-1301, USA. */ | |
252b5132 | 22 | |
252b5132 RH |
23 | #include "as.h" |
24 | #include "input-file.h" | |
25 | #include "sb.h" | |
26 | #include "listing.h" | |
27 | ||
28 | /* | |
29 | * O/S independent module to supply buffers of sanitised source code | |
30 | * to rest of assembler. We get sanitised input data of arbitrary length. | |
31 | * We break these buffers on line boundaries, recombine pieces that | |
32 | * were broken across buffers, and return a buffer of full lines to | |
33 | * the caller. | |
34 | * The last partial line begins the next buffer we build and return to caller. | |
47eebc20 | 35 | * The buffer returned to caller is preceded by BEFORE_STRING and followed |
252b5132 RH |
36 | * by AFTER_STRING, as sentinels. The last character before AFTER_STRING |
37 | * is a newline. | |
38 | * Also looks after line numbers, for e.g. error messages. | |
39 | */ | |
40 | ||
41 | /* | |
42 | * We don't care how filthy our buffers are, but our callers assume | |
43 | * that the following sanitation has already been done. | |
44 | * | |
45 | * No comments, reduce a comment to a space. | |
46 | * Reduce a tab to a space unless it is 1st char of line. | |
47 | * All multiple tabs and spaces collapsed into 1 char. Tab only | |
48 | * legal if 1st char of line. | |
49 | * # line file statements converted to .line x;.file y; statements. | |
50 | * Escaped newlines at end of line: remove them but add as many newlines | |
51 | * to end of statement as you removed in the middle, to synch line numbers. | |
52 | */ | |
53 | \f | |
54 | #define BEFORE_STRING ("\n") | |
e13b337a | 55 | #define AFTER_STRING ("\0") /* memcpy of 0 chars might choke. */ |
252b5132 RH |
56 | #define BEFORE_SIZE (1) |
57 | #define AFTER_SIZE (1) | |
58 | ||
e13b337a KH |
59 | static char *buffer_start; /*->1st char of full buffer area. */ |
60 | static char *partial_where; /*->after last full line in buffer. */ | |
61 | static int partial_size; /* >=0. Number of chars in partial line in buffer. */ | |
7152f1dc KH |
62 | |
63 | /* Because we need AFTER_STRING just after last full line, it clobbers | |
64 | 1st part of partial line. So we preserve 1st part of partial line | |
65 | here. */ | |
252b5132 | 66 | static char save_source[AFTER_SIZE]; |
7152f1dc KH |
67 | |
68 | /* What is the largest size buffer that input_file_give_next_buffer() | |
69 | could return to us? */ | |
70 | static unsigned int buffer_length; | |
252b5132 RH |
71 | |
72 | /* The index into an sb structure we are reading from. -1 if none. */ | |
73 | static int sb_index = -1; | |
74 | ||
75 | /* If we are reading from an sb structure, this is it. */ | |
76 | static sb from_sb; | |
77 | ||
9f10757c TW |
78 | /* Should we do a conditional check on from_sb? */ |
79 | static int from_sb_is_expansion = 1; | |
80 | ||
252b5132 RH |
81 | /* The number of nested sb structures we have included. */ |
82 | int macro_nest; | |
83 | ||
84 | /* We can have more than one source file open at once, though the info for all | |
85 | but the latest one are saved off in a struct input_save. These files remain | |
86 | open, so we are limited by the number of open files allowed by the | |
87 | underlying OS. We may also sequentially read more than one source file in an | |
e13b337a | 88 | assembly. */ |
252b5132 RH |
89 | |
90 | /* We must track the physical file and line number for error messages. We also | |
91 | track a "logical" file and line number corresponding to (C?) compiler | |
92 | source line numbers. Whenever we open a file we must fill in | |
e13b337a | 93 | physical_input_file. So if it is NULL we have not opened any files yet. */ |
252b5132 RH |
94 | |
95 | static char *physical_input_file; | |
96 | static char *logical_input_file; | |
97 | ||
e13b337a KH |
98 | typedef unsigned int line_numberT; /* 1-origin line number in a source file. */ |
99 | /* A line ends in '\n' or eof. */ | |
252b5132 RH |
100 | |
101 | static line_numberT physical_input_line; | |
102 | static int logical_input_line; | |
103 | ||
104 | /* Struct used to save the state of the input handler during include files */ | |
ee515fb7 | 105 | struct input_save { |
e972090a NC |
106 | char * buffer_start; |
107 | char * partial_where; | |
108 | int partial_size; | |
109 | char save_source[AFTER_SIZE]; | |
110 | unsigned int buffer_length; | |
111 | char * physical_input_file; | |
112 | char * logical_input_file; | |
113 | line_numberT physical_input_line; | |
114 | int logical_input_line; | |
115 | int sb_index; | |
116 | sb from_sb; | |
117 | int from_sb_is_expansion; /* Should we do a conditional check? */ | |
118 | struct input_save * next_saved_file; /* Chain of input_saves. */ | |
119 | char * input_file_save; /* Saved state of input routines. */ | |
120 | char * saved_position; /* Caller's saved position in buf. */ | |
7152f1dc | 121 | }; |
252b5132 | 122 | |
b1f1fa96 KH |
123 | static struct input_save *input_scrub_push (char *saved_position); |
124 | static char *input_scrub_pop (struct input_save *arg); | |
252b5132 RH |
125 | |
126 | /* Saved information about the file that .include'd this one. When we hit EOF, | |
e13b337a | 127 | we automatically pop to that file. */ |
252b5132 RH |
128 | |
129 | static struct input_save *next_saved_file; | |
130 | ||
131 | /* Push the state of input reading and scrubbing so that we can #include. | |
132 | The return value is a 'void *' (fudged for old compilers) to a save | |
e13b337a | 133 | area, which can be restored by passing it to input_scrub_pop(). */ |
7152f1dc | 134 | |
252b5132 | 135 | static struct input_save * |
b1f1fa96 | 136 | input_scrub_push (char *saved_position) |
252b5132 RH |
137 | { |
138 | register struct input_save *saved; | |
139 | ||
140 | saved = (struct input_save *) xmalloc (sizeof *saved); | |
141 | ||
142 | saved->saved_position = saved_position; | |
143 | saved->buffer_start = buffer_start; | |
144 | saved->partial_where = partial_where; | |
145 | saved->partial_size = partial_size; | |
146 | saved->buffer_length = buffer_length; | |
147 | saved->physical_input_file = physical_input_file; | |
148 | saved->logical_input_file = logical_input_file; | |
149 | saved->physical_input_line = physical_input_line; | |
150 | saved->logical_input_line = logical_input_line; | |
151 | saved->sb_index = sb_index; | |
152 | saved->from_sb = from_sb; | |
9f10757c | 153 | saved->from_sb_is_expansion = from_sb_is_expansion; |
252b5132 RH |
154 | memcpy (saved->save_source, save_source, sizeof (save_source)); |
155 | saved->next_saved_file = next_saved_file; | |
156 | saved->input_file_save = input_file_push (); | |
157 | ||
158 | input_file_begin (); /* Reinitialize! */ | |
159 | logical_input_line = -1; | |
160 | logical_input_file = (char *) NULL; | |
161 | buffer_length = input_file_buffer_size (); | |
162 | sb_index = -1; | |
163 | ||
164 | buffer_start = xmalloc ((BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE)); | |
165 | memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE); | |
166 | ||
167 | return saved; | |
7152f1dc | 168 | } |
252b5132 RH |
169 | |
170 | static char * | |
b1f1fa96 | 171 | input_scrub_pop (struct input_save *saved) |
252b5132 RH |
172 | { |
173 | char *saved_position; | |
174 | ||
175 | input_scrub_end (); /* Finish off old buffer */ | |
176 | ||
177 | input_file_pop (saved->input_file_save); | |
178 | saved_position = saved->saved_position; | |
179 | buffer_start = saved->buffer_start; | |
180 | buffer_length = saved->buffer_length; | |
181 | physical_input_file = saved->physical_input_file; | |
182 | logical_input_file = saved->logical_input_file; | |
183 | physical_input_line = saved->physical_input_line; | |
184 | logical_input_line = saved->logical_input_line; | |
185 | sb_index = saved->sb_index; | |
186 | from_sb = saved->from_sb; | |
9f10757c | 187 | from_sb_is_expansion = saved->from_sb_is_expansion; |
252b5132 RH |
188 | partial_where = saved->partial_where; |
189 | partial_size = saved->partial_size; | |
190 | next_saved_file = saved->next_saved_file; | |
191 | memcpy (save_source, saved->save_source, sizeof (save_source)); | |
192 | ||
193 | free (saved); | |
194 | return saved_position; | |
195 | } | |
196 | \f | |
252b5132 | 197 | void |
b1f1fa96 | 198 | input_scrub_begin (void) |
252b5132 RH |
199 | { |
200 | know (strlen (BEFORE_STRING) == BEFORE_SIZE); | |
7152f1dc KH |
201 | know (strlen (AFTER_STRING) == AFTER_SIZE |
202 | || (AFTER_STRING[0] == '\0' && AFTER_SIZE == 1)); | |
252b5132 RH |
203 | |
204 | input_file_begin (); | |
205 | ||
206 | buffer_length = input_file_buffer_size (); | |
207 | ||
208 | buffer_start = xmalloc ((BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE)); | |
209 | memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE); | |
210 | ||
e13b337a | 211 | /* Line number things. */ |
252b5132 RH |
212 | logical_input_line = -1; |
213 | logical_input_file = (char *) NULL; | |
e13b337a | 214 | physical_input_file = NULL; /* No file read yet. */ |
252b5132 RH |
215 | next_saved_file = NULL; /* At EOF, don't pop to any other file */ |
216 | do_scrub_begin (flag_m68k_mri); | |
217 | } | |
218 | ||
219 | void | |
b1f1fa96 | 220 | input_scrub_end (void) |
252b5132 RH |
221 | { |
222 | if (buffer_start) | |
223 | { | |
224 | free (buffer_start); | |
225 | buffer_start = 0; | |
226 | input_file_end (); | |
227 | } | |
228 | } | |
229 | ||
7152f1dc KH |
230 | /* Start reading input from a new file. |
231 | Return start of caller's part of buffer. */ | |
252b5132 | 232 | |
7152f1dc | 233 | char * |
b1f1fa96 | 234 | input_scrub_new_file (char *filename) |
252b5132 RH |
235 | { |
236 | input_file_open (filename, !flag_no_comments); | |
237 | physical_input_file = filename[0] ? filename : _("{standard input}"); | |
238 | physical_input_line = 0; | |
239 | ||
240 | partial_size = 0; | |
241 | return (buffer_start + BEFORE_SIZE); | |
242 | } | |
243 | ||
252b5132 RH |
244 | /* Include a file from the current file. Save our state, cause it to |
245 | be restored on EOF, and begin handling a new file. Same result as | |
e13b337a | 246 | input_scrub_new_file. */ |
252b5132 RH |
247 | |
248 | char * | |
b1f1fa96 | 249 | input_scrub_include_file (char *filename, char *position) |
252b5132 RH |
250 | { |
251 | next_saved_file = input_scrub_push (position); | |
252 | return input_scrub_new_file (filename); | |
253 | } | |
254 | ||
255 | /* Start getting input from an sb structure. This is used when | |
256 | expanding a macro. */ | |
257 | ||
258 | void | |
b1f1fa96 | 259 | input_scrub_include_sb (sb *from, char *position, int is_expansion) |
252b5132 RH |
260 | { |
261 | if (macro_nest > max_macro_nest) | |
dcb87e5c | 262 | as_fatal (_("macros nested too deeply")); |
252b5132 RH |
263 | ++macro_nest; |
264 | ||
9f10757c TW |
265 | #ifdef md_macro_start |
266 | if (is_expansion) | |
267 | { | |
268 | md_macro_start (); | |
269 | } | |
270 | #endif | |
271 | ||
252b5132 RH |
272 | next_saved_file = input_scrub_push (position); |
273 | ||
274 | sb_new (&from_sb); | |
9f10757c | 275 | from_sb_is_expansion = is_expansion; |
252b5132 RH |
276 | if (from->len >= 1 && from->ptr[0] != '\n') |
277 | { | |
278 | /* Add the sentinel required by read.c. */ | |
279 | sb_add_char (&from_sb, '\n'); | |
280 | } | |
c19d1205 | 281 | sb_scrub_and_add_sb (&from_sb, from); |
252b5132 RH |
282 | sb_index = 1; |
283 | ||
284 | /* These variables are reset by input_scrub_push. Restore them | |
285 | since we are, after all, still at the same point in the file. */ | |
286 | logical_input_line = next_saved_file->logical_input_line; | |
287 | logical_input_file = next_saved_file->logical_input_file; | |
288 | } | |
289 | ||
290 | void | |
b1f1fa96 | 291 | input_scrub_close (void) |
252b5132 RH |
292 | { |
293 | input_file_close (); | |
294 | } | |
295 | ||
296 | char * | |
b1f1fa96 | 297 | input_scrub_next_buffer (char **bufp) |
252b5132 | 298 | { |
e13b337a | 299 | register char *limit; /*->just after last char of buffer. */ |
252b5132 RH |
300 | |
301 | if (sb_index >= 0) | |
302 | { | |
303 | if (sb_index >= from_sb.len) | |
304 | { | |
305 | sb_kill (&from_sb); | |
7152f1dc | 306 | if (from_sb_is_expansion |
dcb87e5c | 307 | ) |
7152f1dc KH |
308 | { |
309 | cond_finish_check (macro_nest); | |
9f10757c | 310 | #ifdef md_macro_end |
7152f1dc KH |
311 | /* Allow the target to clean up per-macro expansion |
312 | data. */ | |
313 | md_macro_end (); | |
9f10757c | 314 | #endif |
7152f1dc KH |
315 | } |
316 | --macro_nest; | |
252b5132 RH |
317 | partial_where = NULL; |
318 | if (next_saved_file != NULL) | |
319 | *bufp = input_scrub_pop (next_saved_file); | |
320 | return partial_where; | |
321 | } | |
322 | ||
323 | partial_where = from_sb.ptr + from_sb.len; | |
324 | partial_size = 0; | |
325 | *bufp = from_sb.ptr + sb_index; | |
326 | sb_index = from_sb.len; | |
327 | return partial_where; | |
328 | } | |
329 | ||
330 | *bufp = buffer_start + BEFORE_SIZE; | |
331 | ||
332 | if (partial_size) | |
333 | { | |
334 | memcpy (buffer_start + BEFORE_SIZE, partial_where, | |
335 | (unsigned int) partial_size); | |
336 | memcpy (buffer_start + BEFORE_SIZE, save_source, AFTER_SIZE); | |
337 | } | |
338 | limit = input_file_give_next_buffer (buffer_start | |
339 | + BEFORE_SIZE | |
340 | + partial_size); | |
341 | if (limit) | |
342 | { | |
e13b337a | 343 | register char *p; /* Find last newline. */ |
252b5132 RH |
344 | |
345 | for (p = limit - 1; *p != '\n'; --p) | |
346 | ; | |
347 | ++p; | |
348 | ||
349 | while (p <= buffer_start + BEFORE_SIZE) | |
350 | { | |
351 | int limoff; | |
352 | ||
353 | limoff = limit - buffer_start; | |
354 | buffer_length += input_file_buffer_size (); | |
355 | buffer_start = xrealloc (buffer_start, | |
356 | (BEFORE_SIZE | |
357 | + 2 * buffer_length | |
358 | + AFTER_SIZE)); | |
359 | *bufp = buffer_start + BEFORE_SIZE; | |
360 | limit = input_file_give_next_buffer (buffer_start + limoff); | |
361 | ||
362 | if (limit == NULL) | |
363 | { | |
364 | as_warn (_("partial line at end of file ignored")); | |
365 | partial_where = NULL; | |
366 | if (next_saved_file) | |
367 | *bufp = input_scrub_pop (next_saved_file); | |
368 | return NULL; | |
369 | } | |
370 | ||
371 | for (p = limit - 1; *p != '\n'; --p) | |
372 | ; | |
373 | ++p; | |
374 | } | |
375 | ||
376 | partial_where = p; | |
377 | partial_size = limit - p; | |
378 | memcpy (save_source, partial_where, (int) AFTER_SIZE); | |
379 | memcpy (partial_where, AFTER_STRING, (int) AFTER_SIZE); | |
380 | } | |
381 | else | |
382 | { | |
383 | partial_where = 0; | |
384 | if (partial_size > 0) | |
385 | { | |
0e389e77 | 386 | as_warn (_("partial line at end of file ignored")); |
252b5132 RH |
387 | } |
388 | ||
389 | /* Tell the listing we've finished the file. */ | |
390 | LISTING_EOF (); | |
391 | ||
e13b337a | 392 | /* If we should pop to another file at EOF, do it. */ |
252b5132 RH |
393 | if (next_saved_file) |
394 | { | |
395 | *bufp = input_scrub_pop (next_saved_file); /* Pop state */ | |
e13b337a | 396 | /* partial_where is now correct to return, since we popped it. */ |
252b5132 RH |
397 | } |
398 | } | |
399 | return (partial_where); | |
7152f1dc | 400 | } |
252b5132 | 401 | \f |
7152f1dc KH |
402 | /* The remaining part of this file deals with line numbers, error |
403 | messages and so on. Return TRUE if we opened any file. */ | |
252b5132 | 404 | |
252b5132 | 405 | int |
b1f1fa96 | 406 | seen_at_least_1_file (void) |
252b5132 RH |
407 | { |
408 | return (physical_input_file != NULL); | |
409 | } | |
410 | ||
411 | void | |
b1f1fa96 | 412 | bump_line_counters (void) |
252b5132 RH |
413 | { |
414 | if (sb_index < 0) | |
415 | { | |
416 | ++physical_input_line; | |
417 | if (logical_input_line >= 0) | |
418 | ++logical_input_line; | |
419 | } | |
420 | } | |
421 | \f | |
7152f1dc KH |
422 | /* Tells us what the new logical line number and file are. |
423 | If the line_number is -1, we don't change the current logical line | |
424 | number. If it is -2, we decrement the logical line number (this is | |
425 | to support the .appfile pseudo-op inserted into the stream by | |
426 | do_scrub_chars). | |
427 | If the fname is NULL, we don't change the current logical file name. | |
428 | Returns nonzero if the filename actually changes. */ | |
429 | ||
252b5132 | 430 | int |
b1f1fa96 KH |
431 | new_logical_line (char *fname, /* DON'T destroy it! We point to it! */ |
432 | int line_number) | |
252b5132 RH |
433 | { |
434 | if (line_number >= 0) | |
435 | logical_input_line = line_number; | |
436 | else if (line_number == -2 && logical_input_line > 0) | |
437 | --logical_input_line; | |
438 | ||
439 | if (fname | |
440 | && (logical_input_file == NULL | |
441 | || strcmp (logical_input_file, fname))) | |
442 | { | |
443 | logical_input_file = fname; | |
444 | return 1; | |
445 | } | |
446 | else | |
447 | return 0; | |
7152f1dc | 448 | } |
252b5132 | 449 | \f |
7152f1dc KH |
450 | /* Return the current file name and line number. |
451 | namep should be char * const *, but there are compilers which screw | |
452 | up declarations like that, and it's easier to avoid it. */ | |
453 | ||
e13b337a | 454 | void |
b1f1fa96 | 455 | as_where (char **namep, unsigned int *linep) |
252b5132 RH |
456 | { |
457 | if (logical_input_file != NULL | |
458 | && (linep == NULL || logical_input_line >= 0)) | |
459 | { | |
460 | *namep = logical_input_file; | |
461 | if (linep != NULL) | |
462 | *linep = logical_input_line; | |
463 | } | |
464 | else if (physical_input_file != NULL) | |
465 | { | |
466 | *namep = physical_input_file; | |
467 | if (linep != NULL) | |
468 | *linep = physical_input_line; | |
469 | } | |
470 | else | |
471 | { | |
472 | *namep = 0; | |
473 | if (linep != NULL) | |
474 | *linep = 0; | |
475 | } | |
7152f1dc | 476 | } |