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252b5132 RH |
1 | /* input_scrub.c - Break up input buffers into whole numbers of lines. |
2 | Copyright (C) 1987, 90, 91, 92, 93, 94, 95, 96, 1997 | |
3 | Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GAS, the GNU Assembler. | |
6 | ||
7 | GAS is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GAS is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GAS; see the file COPYING. If not, write to the Free | |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
21 | ||
22 | #include <errno.h> /* Need this to make errno declaration right */ | |
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. | |
35 | * The buffer returned to caller is preceeded by BEFORE_STRING and followed | |
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") | |
55 | #define AFTER_STRING ("\0") /* memcpy of 0 chars might choke. */ | |
56 | #define BEFORE_SIZE (1) | |
57 | #define AFTER_SIZE (1) | |
58 | ||
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. */ | |
62 | static char save_source[AFTER_SIZE]; | |
63 | /* Because we need AFTER_STRING just after last */ | |
64 | /* full line, it clobbers 1st part of partial */ | |
65 | /* line. So we preserve 1st part of partial */ | |
66 | /* line here. */ | |
67 | static unsigned int buffer_length; /* What is the largest size buffer that */ | |
68 | /* input_file_give_next_buffer() could */ | |
69 | /* return to us? */ | |
70 | ||
71 | /* The index into an sb structure we are reading from. -1 if none. */ | |
72 | static int sb_index = -1; | |
73 | ||
74 | /* If we are reading from an sb structure, this is it. */ | |
75 | static sb from_sb; | |
76 | ||
77 | /* The number of nested sb structures we have included. */ | |
78 | int macro_nest; | |
79 | ||
80 | /* We can have more than one source file open at once, though the info for all | |
81 | but the latest one are saved off in a struct input_save. These files remain | |
82 | open, so we are limited by the number of open files allowed by the | |
83 | underlying OS. We may also sequentially read more than one source file in an | |
84 | assembly. */ | |
85 | ||
86 | /* We must track the physical file and line number for error messages. We also | |
87 | track a "logical" file and line number corresponding to (C?) compiler | |
88 | source line numbers. Whenever we open a file we must fill in | |
89 | physical_input_file. So if it is NULL we have not opened any files yet. */ | |
90 | ||
91 | static char *physical_input_file; | |
92 | static char *logical_input_file; | |
93 | ||
94 | typedef unsigned int line_numberT; /* 1-origin line number in a source file. */ | |
95 | /* A line ends in '\n' or eof. */ | |
96 | ||
97 | static line_numberT physical_input_line; | |
98 | static int logical_input_line; | |
99 | ||
100 | /* Struct used to save the state of the input handler during include files */ | |
101 | struct input_save | |
102 | { | |
103 | char *buffer_start; | |
104 | char *partial_where; | |
105 | int partial_size; | |
106 | char save_source[AFTER_SIZE]; | |
107 | unsigned int buffer_length; | |
108 | char *physical_input_file; | |
109 | char *logical_input_file; | |
110 | line_numberT physical_input_line; | |
111 | int logical_input_line; | |
112 | int sb_index; | |
113 | sb from_sb; | |
114 | struct input_save *next_saved_file; /* Chain of input_saves */ | |
115 | char *input_file_save; /* Saved state of input routines */ | |
116 | char *saved_position; /* Caller's saved position in buf */ | |
117 | }; | |
118 | ||
119 | static struct input_save *input_scrub_push PARAMS ((char *saved_position)); | |
120 | static char *input_scrub_pop PARAMS ((struct input_save *arg)); | |
121 | static void as_1_char PARAMS ((unsigned int c, FILE * stream)); | |
122 | ||
123 | /* Saved information about the file that .include'd this one. When we hit EOF, | |
124 | we automatically pop to that file. */ | |
125 | ||
126 | static struct input_save *next_saved_file; | |
127 | ||
128 | /* Push the state of input reading and scrubbing so that we can #include. | |
129 | The return value is a 'void *' (fudged for old compilers) to a save | |
130 | area, which can be restored by passing it to input_scrub_pop(). */ | |
131 | static struct input_save * | |
132 | input_scrub_push (saved_position) | |
133 | char *saved_position; | |
134 | { | |
135 | register struct input_save *saved; | |
136 | ||
137 | saved = (struct input_save *) xmalloc (sizeof *saved); | |
138 | ||
139 | saved->saved_position = saved_position; | |
140 | saved->buffer_start = buffer_start; | |
141 | saved->partial_where = partial_where; | |
142 | saved->partial_size = partial_size; | |
143 | saved->buffer_length = buffer_length; | |
144 | saved->physical_input_file = physical_input_file; | |
145 | saved->logical_input_file = logical_input_file; | |
146 | saved->physical_input_line = physical_input_line; | |
147 | saved->logical_input_line = logical_input_line; | |
148 | saved->sb_index = sb_index; | |
149 | saved->from_sb = from_sb; | |
150 | memcpy (saved->save_source, save_source, sizeof (save_source)); | |
151 | saved->next_saved_file = next_saved_file; | |
152 | saved->input_file_save = input_file_push (); | |
153 | ||
154 | input_file_begin (); /* Reinitialize! */ | |
155 | logical_input_line = -1; | |
156 | logical_input_file = (char *) NULL; | |
157 | buffer_length = input_file_buffer_size (); | |
158 | sb_index = -1; | |
159 | ||
160 | buffer_start = xmalloc ((BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE)); | |
161 | memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE); | |
162 | ||
163 | return saved; | |
164 | } /* input_scrub_push() */ | |
165 | ||
166 | static char * | |
167 | input_scrub_pop (saved) | |
168 | struct input_save *saved; | |
169 | { | |
170 | char *saved_position; | |
171 | ||
172 | input_scrub_end (); /* Finish off old buffer */ | |
173 | ||
174 | input_file_pop (saved->input_file_save); | |
175 | saved_position = saved->saved_position; | |
176 | buffer_start = saved->buffer_start; | |
177 | buffer_length = saved->buffer_length; | |
178 | physical_input_file = saved->physical_input_file; | |
179 | logical_input_file = saved->logical_input_file; | |
180 | physical_input_line = saved->physical_input_line; | |
181 | logical_input_line = saved->logical_input_line; | |
182 | sb_index = saved->sb_index; | |
183 | from_sb = saved->from_sb; | |
184 | partial_where = saved->partial_where; | |
185 | partial_size = saved->partial_size; | |
186 | next_saved_file = saved->next_saved_file; | |
187 | memcpy (save_source, saved->save_source, sizeof (save_source)); | |
188 | ||
189 | free (saved); | |
190 | return saved_position; | |
191 | } | |
192 | \f | |
193 | ||
194 | void | |
195 | input_scrub_begin () | |
196 | { | |
197 | know (strlen (BEFORE_STRING) == BEFORE_SIZE); | |
198 | know (strlen (AFTER_STRING) == AFTER_SIZE || (AFTER_STRING[0] == '\0' && AFTER_SIZE == 1)); | |
199 | ||
200 | input_file_begin (); | |
201 | ||
202 | buffer_length = input_file_buffer_size (); | |
203 | ||
204 | buffer_start = xmalloc ((BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE)); | |
205 | memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE); | |
206 | ||
207 | /* Line number things. */ | |
208 | logical_input_line = -1; | |
209 | logical_input_file = (char *) NULL; | |
210 | physical_input_file = NULL; /* No file read yet. */ | |
211 | next_saved_file = NULL; /* At EOF, don't pop to any other file */ | |
212 | do_scrub_begin (flag_m68k_mri); | |
213 | } | |
214 | ||
215 | void | |
216 | input_scrub_end () | |
217 | { | |
218 | if (buffer_start) | |
219 | { | |
220 | free (buffer_start); | |
221 | buffer_start = 0; | |
222 | input_file_end (); | |
223 | } | |
224 | } | |
225 | ||
226 | /* Start reading input from a new file. */ | |
227 | ||
228 | char * /* Return start of caller's part of buffer. */ | |
229 | input_scrub_new_file (filename) | |
230 | char *filename; | |
231 | { | |
232 | input_file_open (filename, !flag_no_comments); | |
233 | physical_input_file = filename[0] ? filename : _("{standard input}"); | |
234 | physical_input_line = 0; | |
235 | ||
236 | partial_size = 0; | |
237 | return (buffer_start + BEFORE_SIZE); | |
238 | } | |
239 | ||
240 | ||
241 | /* Include a file from the current file. Save our state, cause it to | |
242 | be restored on EOF, and begin handling a new file. Same result as | |
243 | input_scrub_new_file. */ | |
244 | ||
245 | char * | |
246 | input_scrub_include_file (filename, position) | |
247 | char *filename; | |
248 | char *position; | |
249 | { | |
250 | next_saved_file = input_scrub_push (position); | |
251 | return input_scrub_new_file (filename); | |
252 | } | |
253 | ||
254 | /* Start getting input from an sb structure. This is used when | |
255 | expanding a macro. */ | |
256 | ||
257 | void | |
258 | input_scrub_include_sb (from, position) | |
259 | sb *from; | |
260 | char *position; | |
261 | { | |
262 | if (macro_nest > max_macro_nest) | |
263 | as_fatal (_("macros nested too deeply")); | |
264 | ++macro_nest; | |
265 | ||
266 | next_saved_file = input_scrub_push (position); | |
267 | ||
268 | sb_new (&from_sb); | |
269 | if (from->len >= 1 && from->ptr[0] != '\n') | |
270 | { | |
271 | /* Add the sentinel required by read.c. */ | |
272 | sb_add_char (&from_sb, '\n'); | |
273 | } | |
274 | sb_add_sb (&from_sb, from); | |
275 | sb_index = 1; | |
276 | ||
277 | /* These variables are reset by input_scrub_push. Restore them | |
278 | since we are, after all, still at the same point in the file. */ | |
279 | logical_input_line = next_saved_file->logical_input_line; | |
280 | logical_input_file = next_saved_file->logical_input_file; | |
281 | } | |
282 | ||
283 | void | |
284 | input_scrub_close () | |
285 | { | |
286 | input_file_close (); | |
287 | } | |
288 | ||
289 | char * | |
290 | input_scrub_next_buffer (bufp) | |
291 | char **bufp; | |
292 | { | |
293 | register char *limit; /*->just after last char of buffer. */ | |
294 | ||
295 | if (sb_index >= 0) | |
296 | { | |
297 | if (sb_index >= from_sb.len) | |
298 | { | |
299 | sb_kill (&from_sb); | |
300 | cond_finish_check (macro_nest); | |
301 | --macro_nest; | |
302 | partial_where = NULL; | |
303 | if (next_saved_file != NULL) | |
304 | *bufp = input_scrub_pop (next_saved_file); | |
305 | return partial_where; | |
306 | } | |
307 | ||
308 | partial_where = from_sb.ptr + from_sb.len; | |
309 | partial_size = 0; | |
310 | *bufp = from_sb.ptr + sb_index; | |
311 | sb_index = from_sb.len; | |
312 | return partial_where; | |
313 | } | |
314 | ||
315 | *bufp = buffer_start + BEFORE_SIZE; | |
316 | ||
317 | if (partial_size) | |
318 | { | |
319 | memcpy (buffer_start + BEFORE_SIZE, partial_where, | |
320 | (unsigned int) partial_size); | |
321 | memcpy (buffer_start + BEFORE_SIZE, save_source, AFTER_SIZE); | |
322 | } | |
323 | limit = input_file_give_next_buffer (buffer_start | |
324 | + BEFORE_SIZE | |
325 | + partial_size); | |
326 | if (limit) | |
327 | { | |
328 | register char *p; /* Find last newline. */ | |
329 | ||
330 | for (p = limit - 1; *p != '\n'; --p) | |
331 | ; | |
332 | ++p; | |
333 | ||
334 | while (p <= buffer_start + BEFORE_SIZE) | |
335 | { | |
336 | int limoff; | |
337 | ||
338 | limoff = limit - buffer_start; | |
339 | buffer_length += input_file_buffer_size (); | |
340 | buffer_start = xrealloc (buffer_start, | |
341 | (BEFORE_SIZE | |
342 | + 2 * buffer_length | |
343 | + AFTER_SIZE)); | |
344 | *bufp = buffer_start + BEFORE_SIZE; | |
345 | limit = input_file_give_next_buffer (buffer_start + limoff); | |
346 | ||
347 | if (limit == NULL) | |
348 | { | |
349 | as_warn (_("partial line at end of file ignored")); | |
350 | partial_where = NULL; | |
351 | if (next_saved_file) | |
352 | *bufp = input_scrub_pop (next_saved_file); | |
353 | return NULL; | |
354 | } | |
355 | ||
356 | for (p = limit - 1; *p != '\n'; --p) | |
357 | ; | |
358 | ++p; | |
359 | } | |
360 | ||
361 | partial_where = p; | |
362 | partial_size = limit - p; | |
363 | memcpy (save_source, partial_where, (int) AFTER_SIZE); | |
364 | memcpy (partial_where, AFTER_STRING, (int) AFTER_SIZE); | |
365 | } | |
366 | else | |
367 | { | |
368 | partial_where = 0; | |
369 | if (partial_size > 0) | |
370 | { | |
371 | as_warn (_("Partial line at end of file ignored")); | |
372 | } | |
373 | ||
374 | /* Tell the listing we've finished the file. */ | |
375 | LISTING_EOF (); | |
376 | ||
377 | /* If we should pop to another file at EOF, do it. */ | |
378 | if (next_saved_file) | |
379 | { | |
380 | *bufp = input_scrub_pop (next_saved_file); /* Pop state */ | |
381 | /* partial_where is now correct to return, since we popped it. */ | |
382 | } | |
383 | } | |
384 | return (partial_where); | |
385 | } /* input_scrub_next_buffer() */ | |
386 | \f | |
387 | /* | |
388 | * The remaining part of this file deals with line numbers, error | |
389 | * messages and so on. | |
390 | */ | |
391 | ||
392 | ||
393 | int | |
394 | seen_at_least_1_file () /* TRUE if we opened any file. */ | |
395 | { | |
396 | return (physical_input_file != NULL); | |
397 | } | |
398 | ||
399 | void | |
400 | bump_line_counters () | |
401 | { | |
402 | if (sb_index < 0) | |
403 | { | |
404 | ++physical_input_line; | |
405 | if (logical_input_line >= 0) | |
406 | ++logical_input_line; | |
407 | } | |
408 | } | |
409 | \f | |
410 | /* | |
411 | * new_logical_line() | |
412 | * | |
413 | * Tells us what the new logical line number and file are. | |
414 | * If the line_number is -1, we don't change the current logical line | |
415 | * number. If it is -2, we decrement the logical line number (this is | |
416 | * to support the .appfile pseudo-op inserted into the stream by | |
417 | * do_scrub_chars). | |
418 | * If the fname is NULL, we don't change the current logical file name. | |
419 | * Returns nonzero if the filename actually changes. | |
420 | */ | |
421 | int | |
422 | new_logical_line (fname, line_number) | |
423 | char *fname; /* DON'T destroy it! We point to it! */ | |
424 | int line_number; | |
425 | { | |
426 | if (line_number >= 0) | |
427 | logical_input_line = line_number; | |
428 | else if (line_number == -2 && logical_input_line > 0) | |
429 | --logical_input_line; | |
430 | ||
431 | if (fname | |
432 | && (logical_input_file == NULL | |
433 | || strcmp (logical_input_file, fname))) | |
434 | { | |
435 | logical_input_file = fname; | |
436 | return 1; | |
437 | } | |
438 | else | |
439 | return 0; | |
440 | } /* new_logical_line() */ | |
441 | \f | |
442 | /* | |
443 | * a s _ w h e r e () | |
444 | * | |
445 | * Return the current file name and line number. | |
446 | * namep should be char * const *, but there are compilers which screw | |
447 | * up declarations like that, and it's easier to avoid it. | |
448 | */ | |
449 | void | |
450 | as_where (namep, linep) | |
451 | char **namep; | |
452 | unsigned int *linep; | |
453 | { | |
454 | if (logical_input_file != NULL | |
455 | && (linep == NULL || logical_input_line >= 0)) | |
456 | { | |
457 | *namep = logical_input_file; | |
458 | if (linep != NULL) | |
459 | *linep = logical_input_line; | |
460 | } | |
461 | else if (physical_input_file != NULL) | |
462 | { | |
463 | *namep = physical_input_file; | |
464 | if (linep != NULL) | |
465 | *linep = physical_input_line; | |
466 | } | |
467 | else | |
468 | { | |
469 | *namep = 0; | |
470 | if (linep != NULL) | |
471 | *linep = 0; | |
472 | } | |
473 | } /* as_where() */ | |
474 | \f | |
475 | ||
476 | ||
477 | ||
478 | /* | |
479 | * a s _ h o w m u c h () | |
480 | * | |
481 | * Output to given stream how much of line we have scanned so far. | |
482 | * Assumes we have scanned up to and including input_line_pointer. | |
483 | * No free '\n' at end of line. | |
484 | */ | |
485 | void | |
486 | as_howmuch (stream) | |
487 | FILE *stream; /* Opened for write please. */ | |
488 | { | |
489 | register char *p; /* Scan input line. */ | |
490 | /* register char c; JF unused */ | |
491 | ||
492 | for (p = input_line_pointer - 1; *p != '\n'; --p) | |
493 | { | |
494 | } | |
495 | ++p; /* p->1st char of line. */ | |
496 | for (; p <= input_line_pointer; p++) | |
497 | { | |
498 | /* Assume ASCII. EBCDIC & other micro-computer char sets ignored. */ | |
499 | as_1_char ((unsigned char) *p, stream); | |
500 | } | |
501 | } | |
502 | ||
503 | static void | |
504 | as_1_char (c, stream) | |
505 | unsigned int c; | |
506 | FILE *stream; | |
507 | { | |
508 | if (c > 127) | |
509 | { | |
510 | (void) putc ('%', stream); | |
511 | c -= 128; | |
512 | } | |
513 | if (c < 32) | |
514 | { | |
515 | (void) putc ('^', stream); | |
516 | c += '@'; | |
517 | } | |
518 | (void) putc (c, stream); | |
519 | } | |
520 | ||
521 | /* end of input_scrub.c */ |