Commit | Line | Data |
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7146af97 | 1 | /* Storage allocation and gc for GNU Emacs Lisp interpreter. |
3a22ee35 | 2 | Copyright (C) 1985, 1986, 1988, 1993, 1994 Free Software Foundation, Inc. |
7146af97 JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
7c299e7a | 8 | the Free Software Foundation; either version 2, or (at your option) |
7146af97 JB |
9 | any later version. |
10 | ||
11 | GNU Emacs 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 Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
cf026b25 | 20 | #include <signal.h> |
7146af97 | 21 | |
18160b98 | 22 | #include <config.h> |
7146af97 | 23 | #include "lisp.h" |
d5e35230 | 24 | #include "intervals.h" |
4c0be5f4 | 25 | #include "puresize.h" |
7146af97 JB |
26 | #ifndef standalone |
27 | #include "buffer.h" | |
28 | #include "window.h" | |
502b9b64 | 29 | #include "frame.h" |
9ac0d9e0 | 30 | #include "blockinput.h" |
7146af97 JB |
31 | #endif |
32 | ||
e065a56e JB |
33 | #include "syssignal.h" |
34 | ||
7146af97 JB |
35 | #define max(A,B) ((A) > (B) ? (A) : (B)) |
36 | ||
37 | /* Macro to verify that storage intended for Lisp objects is not | |
38 | out of range to fit in the space for a pointer. | |
39 | ADDRESS is the start of the block, and SIZE | |
40 | is the amount of space within which objects can start. */ | |
41 | #define VALIDATE_LISP_STORAGE(address, size) \ | |
42 | do \ | |
43 | { \ | |
44 | Lisp_Object val; \ | |
45d12a89 | 45 | XSETCONS (val, (char *) address + size); \ |
7146af97 JB |
46 | if ((char *) XCONS (val) != (char *) address + size) \ |
47 | { \ | |
9ac0d9e0 | 48 | xfree (address); \ |
7146af97 JB |
49 | memory_full (); \ |
50 | } \ | |
51 | } while (0) | |
52 | ||
53 | /* Number of bytes of consing done since the last gc */ | |
54 | int consing_since_gc; | |
55 | ||
56 | /* Number of bytes of consing since gc before another gc should be done. */ | |
57 | int gc_cons_threshold; | |
58 | ||
59 | /* Nonzero during gc */ | |
60 | int gc_in_progress; | |
61 | ||
62 | #ifndef VIRT_ADDR_VARIES | |
63 | extern | |
64 | #endif /* VIRT_ADDR_VARIES */ | |
65 | int malloc_sbrk_used; | |
66 | ||
67 | #ifndef VIRT_ADDR_VARIES | |
68 | extern | |
69 | #endif /* VIRT_ADDR_VARIES */ | |
70 | int malloc_sbrk_unused; | |
71 | ||
502b9b64 JB |
72 | /* Two limits controlling how much undo information to keep. */ |
73 | int undo_limit; | |
74 | int undo_strong_limit; | |
7146af97 JB |
75 | |
76 | /* Non-nil means defun should do purecopy on the function definition */ | |
77 | Lisp_Object Vpurify_flag; | |
78 | ||
79 | #ifndef HAVE_SHM | |
42607681 | 80 | EMACS_INT pure[PURESIZE / sizeof (EMACS_INT)] = {0,}; /* Force it into data space! */ |
7146af97 JB |
81 | #define PUREBEG (char *) pure |
82 | #else | |
83 | #define pure PURE_SEG_BITS /* Use shared memory segment */ | |
84 | #define PUREBEG (char *)PURE_SEG_BITS | |
4c0be5f4 JB |
85 | |
86 | /* This variable is used only by the XPNTR macro when HAVE_SHM is | |
87 | defined. If we used the PURESIZE macro directly there, that would | |
88 | make most of emacs dependent on puresize.h, which we don't want - | |
89 | you should be able to change that without too much recompilation. | |
90 | So map_in_data initializes pure_size, and the dependencies work | |
91 | out. */ | |
42607681 | 92 | EMACS_INT pure_size; |
7146af97 JB |
93 | #endif /* not HAVE_SHM */ |
94 | ||
95 | /* Index in pure at which next pure object will be allocated. */ | |
96 | int pureptr; | |
97 | ||
98 | /* If nonzero, this is a warning delivered by malloc and not yet displayed. */ | |
99 | char *pending_malloc_warning; | |
100 | ||
bcb61d60 | 101 | /* Pre-computed signal argument for use when memory is exhausted. */ |
cf3540e4 | 102 | Lisp_Object memory_signal_data; |
bcb61d60 | 103 | |
7146af97 JB |
104 | /* Maximum amount of C stack to save when a GC happens. */ |
105 | ||
106 | #ifndef MAX_SAVE_STACK | |
107 | #define MAX_SAVE_STACK 16000 | |
108 | #endif | |
109 | ||
110 | /* Buffer in which we save a copy of the C stack at each GC. */ | |
111 | ||
112 | char *stack_copy; | |
113 | int stack_copy_size; | |
114 | ||
115 | /* Non-zero means ignore malloc warnings. Set during initialization. */ | |
116 | int ignore_warnings; | |
350273a4 JA |
117 | |
118 | static void mark_object (), mark_buffer (); | |
119 | static void clear_marks (), gc_sweep (); | |
120 | static void compact_strings (); | |
7146af97 | 121 | \f |
1a4f1e2c JB |
122 | /* Versions of malloc and realloc that print warnings as memory gets full. */ |
123 | ||
7146af97 JB |
124 | Lisp_Object |
125 | malloc_warning_1 (str) | |
126 | Lisp_Object str; | |
127 | { | |
128 | Fprinc (str, Vstandard_output); | |
129 | write_string ("\nKilling some buffers may delay running out of memory.\n", -1); | |
130 | write_string ("However, certainly by the time you receive the 95% warning,\n", -1); | |
131 | write_string ("you should clean up, kill this Emacs, and start a new one.", -1); | |
132 | return Qnil; | |
133 | } | |
134 | ||
135 | /* malloc calls this if it finds we are near exhausting storage */ | |
136 | malloc_warning (str) | |
137 | char *str; | |
138 | { | |
139 | pending_malloc_warning = str; | |
140 | } | |
141 | ||
142 | display_malloc_warning () | |
143 | { | |
144 | register Lisp_Object val; | |
145 | ||
146 | val = build_string (pending_malloc_warning); | |
147 | pending_malloc_warning = 0; | |
148 | internal_with_output_to_temp_buffer (" *Danger*", malloc_warning_1, val); | |
149 | } | |
150 | ||
151 | /* Called if malloc returns zero */ | |
152 | memory_full () | |
153 | { | |
bcb61d60 KH |
154 | /* This used to call error, but if we've run out of memory, we could get |
155 | infinite recursion trying to build the string. */ | |
156 | while (1) | |
157 | Fsignal (Qerror, memory_signal_data); | |
7146af97 JB |
158 | } |
159 | ||
9ac0d9e0 | 160 | /* like malloc routines but check for no memory and block interrupt input. */ |
7146af97 JB |
161 | |
162 | long * | |
163 | xmalloc (size) | |
164 | int size; | |
165 | { | |
166 | register long *val; | |
167 | ||
9ac0d9e0 | 168 | BLOCK_INPUT; |
7146af97 | 169 | val = (long *) malloc (size); |
9ac0d9e0 | 170 | UNBLOCK_INPUT; |
7146af97 JB |
171 | |
172 | if (!val && size) memory_full (); | |
173 | return val; | |
174 | } | |
175 | ||
176 | long * | |
177 | xrealloc (block, size) | |
178 | long *block; | |
179 | int size; | |
180 | { | |
181 | register long *val; | |
182 | ||
9ac0d9e0 | 183 | BLOCK_INPUT; |
56d2031b JB |
184 | /* We must call malloc explicitly when BLOCK is 0, since some |
185 | reallocs don't do this. */ | |
186 | if (! block) | |
187 | val = (long *) malloc (size); | |
f048679d | 188 | else |
56d2031b | 189 | val = (long *) realloc (block, size); |
9ac0d9e0 | 190 | UNBLOCK_INPUT; |
7146af97 JB |
191 | |
192 | if (!val && size) memory_full (); | |
193 | return val; | |
194 | } | |
9ac0d9e0 JB |
195 | |
196 | void | |
197 | xfree (block) | |
198 | long *block; | |
199 | { | |
200 | BLOCK_INPUT; | |
201 | free (block); | |
202 | UNBLOCK_INPUT; | |
203 | } | |
204 | ||
205 | \f | |
206 | /* Arranging to disable input signals while we're in malloc. | |
207 | ||
208 | This only works with GNU malloc. To help out systems which can't | |
209 | use GNU malloc, all the calls to malloc, realloc, and free | |
210 | elsewhere in the code should be inside a BLOCK_INPUT/UNBLOCK_INPUT | |
211 | pairs; unfortunately, we have no idea what C library functions | |
212 | might call malloc, so we can't really protect them unless you're | |
213 | using GNU malloc. Fortunately, most of the major operating can use | |
214 | GNU malloc. */ | |
215 | ||
216 | #ifndef SYSTEM_MALLOC | |
b0846f52 JB |
217 | extern void * (*__malloc_hook) (); |
218 | static void * (*old_malloc_hook) (); | |
219 | extern void * (*__realloc_hook) (); | |
220 | static void * (*old_realloc_hook) (); | |
221 | extern void (*__free_hook) (); | |
222 | static void (*old_free_hook) (); | |
9ac0d9e0 JB |
223 | |
224 | static void | |
225 | emacs_blocked_free (ptr) | |
226 | void *ptr; | |
227 | { | |
228 | BLOCK_INPUT; | |
229 | __free_hook = old_free_hook; | |
230 | free (ptr); | |
b0846f52 | 231 | __free_hook = emacs_blocked_free; |
9ac0d9e0 JB |
232 | UNBLOCK_INPUT; |
233 | } | |
234 | ||
235 | static void * | |
236 | emacs_blocked_malloc (size) | |
237 | unsigned size; | |
238 | { | |
239 | void *value; | |
240 | ||
241 | BLOCK_INPUT; | |
242 | __malloc_hook = old_malloc_hook; | |
2756d8ee | 243 | value = (void *) malloc (size); |
b0846f52 | 244 | __malloc_hook = emacs_blocked_malloc; |
9ac0d9e0 JB |
245 | UNBLOCK_INPUT; |
246 | ||
247 | return value; | |
248 | } | |
249 | ||
250 | static void * | |
251 | emacs_blocked_realloc (ptr, size) | |
252 | void *ptr; | |
253 | unsigned size; | |
254 | { | |
255 | void *value; | |
256 | ||
257 | BLOCK_INPUT; | |
258 | __realloc_hook = old_realloc_hook; | |
2756d8ee | 259 | value = (void *) realloc (ptr, size); |
b0846f52 | 260 | __realloc_hook = emacs_blocked_realloc; |
9ac0d9e0 JB |
261 | UNBLOCK_INPUT; |
262 | ||
263 | return value; | |
264 | } | |
265 | ||
266 | void | |
267 | uninterrupt_malloc () | |
268 | { | |
269 | old_free_hook = __free_hook; | |
b0846f52 | 270 | __free_hook = emacs_blocked_free; |
9ac0d9e0 JB |
271 | |
272 | old_malloc_hook = __malloc_hook; | |
b0846f52 | 273 | __malloc_hook = emacs_blocked_malloc; |
9ac0d9e0 JB |
274 | |
275 | old_realloc_hook = __realloc_hook; | |
b0846f52 | 276 | __realloc_hook = emacs_blocked_realloc; |
9ac0d9e0 JB |
277 | } |
278 | #endif | |
7146af97 | 279 | \f |
1a4f1e2c JB |
280 | /* Interval allocation. */ |
281 | ||
d5e35230 JA |
282 | #ifdef USE_TEXT_PROPERTIES |
283 | #define INTERVAL_BLOCK_SIZE \ | |
284 | ((1020 - sizeof (struct interval_block *)) / sizeof (struct interval)) | |
285 | ||
286 | struct interval_block | |
287 | { | |
288 | struct interval_block *next; | |
289 | struct interval intervals[INTERVAL_BLOCK_SIZE]; | |
290 | }; | |
291 | ||
292 | struct interval_block *interval_block; | |
293 | static int interval_block_index; | |
294 | ||
295 | INTERVAL interval_free_list; | |
296 | ||
297 | static void | |
298 | init_intervals () | |
299 | { | |
300 | interval_block | |
301 | = (struct interval_block *) malloc (sizeof (struct interval_block)); | |
302 | interval_block->next = 0; | |
303 | bzero (interval_block->intervals, sizeof interval_block->intervals); | |
304 | interval_block_index = 0; | |
305 | interval_free_list = 0; | |
306 | } | |
307 | ||
308 | #define INIT_INTERVALS init_intervals () | |
309 | ||
310 | INTERVAL | |
311 | make_interval () | |
312 | { | |
313 | INTERVAL val; | |
314 | ||
315 | if (interval_free_list) | |
316 | { | |
317 | val = interval_free_list; | |
318 | interval_free_list = interval_free_list->parent; | |
319 | } | |
320 | else | |
321 | { | |
322 | if (interval_block_index == INTERVAL_BLOCK_SIZE) | |
323 | { | |
324 | register struct interval_block *newi | |
9ac0d9e0 | 325 | = (struct interval_block *) xmalloc (sizeof (struct interval_block)); |
d5e35230 JA |
326 | |
327 | VALIDATE_LISP_STORAGE (newi, sizeof *newi); | |
328 | newi->next = interval_block; | |
329 | interval_block = newi; | |
330 | interval_block_index = 0; | |
331 | } | |
332 | val = &interval_block->intervals[interval_block_index++]; | |
333 | } | |
334 | consing_since_gc += sizeof (struct interval); | |
335 | RESET_INTERVAL (val); | |
336 | return val; | |
337 | } | |
338 | ||
339 | static int total_free_intervals, total_intervals; | |
340 | ||
341 | /* Mark the pointers of one interval. */ | |
342 | ||
343 | static void | |
d393c068 | 344 | mark_interval (i, dummy) |
d5e35230 | 345 | register INTERVAL i; |
d393c068 | 346 | Lisp_Object dummy; |
d5e35230 JA |
347 | { |
348 | if (XMARKBIT (i->plist)) | |
349 | abort (); | |
350 | mark_object (&i->plist); | |
351 | XMARK (i->plist); | |
352 | } | |
353 | ||
354 | static void | |
355 | mark_interval_tree (tree) | |
356 | register INTERVAL tree; | |
357 | { | |
e8720644 JB |
358 | /* No need to test if this tree has been marked already; this |
359 | function is always called through the MARK_INTERVAL_TREE macro, | |
360 | which takes care of that. */ | |
361 | ||
362 | /* XMARK expands to an assignment; the LHS of an assignment can't be | |
363 | a cast. */ | |
364 | XMARK (* (Lisp_Object *) &tree->parent); | |
d5e35230 | 365 | |
d393c068 | 366 | traverse_intervals (tree, 1, 0, mark_interval, Qnil); |
d5e35230 JA |
367 | } |
368 | ||
e8720644 JB |
369 | #define MARK_INTERVAL_TREE(i) \ |
370 | do { \ | |
371 | if (!NULL_INTERVAL_P (i) \ | |
372 | && ! XMARKBIT ((Lisp_Object) i->parent)) \ | |
373 | mark_interval_tree (i); \ | |
374 | } while (0) | |
d5e35230 | 375 | |
1a4f1e2c | 376 | /* The oddity in the call to XUNMARK is necessary because XUNMARK |
eb8c3be9 | 377 | expands to an assignment to its argument, and most C compilers don't |
1a4f1e2c JB |
378 | support casts on the left operand of `='. */ |
379 | #define UNMARK_BALANCE_INTERVALS(i) \ | |
380 | { \ | |
381 | if (! NULL_INTERVAL_P (i)) \ | |
382 | { \ | |
383 | XUNMARK (* (Lisp_Object *) (&(i)->parent)); \ | |
384 | (i) = balance_intervals (i); \ | |
385 | } \ | |
d5e35230 JA |
386 | } |
387 | ||
388 | #else /* no interval use */ | |
389 | ||
390 | #define INIT_INTERVALS | |
391 | ||
392 | #define UNMARK_BALANCE_INTERVALS(i) | |
393 | #define MARK_INTERVAL_TREE(i) | |
394 | ||
395 | #endif /* no interval use */ | |
396 | \f | |
1a4f1e2c JB |
397 | /* Floating point allocation. */ |
398 | ||
7146af97 JB |
399 | #ifdef LISP_FLOAT_TYPE |
400 | /* Allocation of float cells, just like conses */ | |
401 | /* We store float cells inside of float_blocks, allocating a new | |
402 | float_block with malloc whenever necessary. Float cells reclaimed by | |
403 | GC are put on a free list to be reallocated before allocating | |
404 | any new float cells from the latest float_block. | |
405 | ||
406 | Each float_block is just under 1020 bytes long, | |
407 | since malloc really allocates in units of powers of two | |
408 | and uses 4 bytes for its own overhead. */ | |
409 | ||
410 | #define FLOAT_BLOCK_SIZE \ | |
411 | ((1020 - sizeof (struct float_block *)) / sizeof (struct Lisp_Float)) | |
412 | ||
413 | struct float_block | |
414 | { | |
415 | struct float_block *next; | |
416 | struct Lisp_Float floats[FLOAT_BLOCK_SIZE]; | |
417 | }; | |
418 | ||
419 | struct float_block *float_block; | |
420 | int float_block_index; | |
421 | ||
422 | struct Lisp_Float *float_free_list; | |
423 | ||
424 | void | |
425 | init_float () | |
426 | { | |
427 | float_block = (struct float_block *) malloc (sizeof (struct float_block)); | |
428 | float_block->next = 0; | |
429 | bzero (float_block->floats, sizeof float_block->floats); | |
430 | float_block_index = 0; | |
431 | float_free_list = 0; | |
432 | } | |
433 | ||
434 | /* Explicitly free a float cell. */ | |
435 | free_float (ptr) | |
436 | struct Lisp_Float *ptr; | |
437 | { | |
85481507 | 438 | *(struct Lisp_Float **)&ptr->type = float_free_list; |
7146af97 JB |
439 | float_free_list = ptr; |
440 | } | |
441 | ||
442 | Lisp_Object | |
443 | make_float (float_value) | |
444 | double float_value; | |
445 | { | |
446 | register Lisp_Object val; | |
447 | ||
448 | if (float_free_list) | |
449 | { | |
45d12a89 | 450 | XSETFLOAT (val, float_free_list); |
85481507 | 451 | float_free_list = *(struct Lisp_Float **)&float_free_list->type; |
7146af97 JB |
452 | } |
453 | else | |
454 | { | |
455 | if (float_block_index == FLOAT_BLOCK_SIZE) | |
456 | { | |
9ac0d9e0 | 457 | register struct float_block *new = (struct float_block *) xmalloc (sizeof (struct float_block)); |
7146af97 JB |
458 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
459 | new->next = float_block; | |
460 | float_block = new; | |
461 | float_block_index = 0; | |
462 | } | |
45d12a89 | 463 | XSETFLOAT (val, &float_block->floats[float_block_index++]); |
7146af97 JB |
464 | } |
465 | XFLOAT (val)->data = float_value; | |
67ba9986 | 466 | XSETFASTINT (XFLOAT (val)->type, 0); /* bug chasing -wsr */ |
7146af97 JB |
467 | consing_since_gc += sizeof (struct Lisp_Float); |
468 | return val; | |
469 | } | |
470 | ||
471 | #endif /* LISP_FLOAT_TYPE */ | |
472 | \f | |
473 | /* Allocation of cons cells */ | |
474 | /* We store cons cells inside of cons_blocks, allocating a new | |
475 | cons_block with malloc whenever necessary. Cons cells reclaimed by | |
476 | GC are put on a free list to be reallocated before allocating | |
477 | any new cons cells from the latest cons_block. | |
478 | ||
479 | Each cons_block is just under 1020 bytes long, | |
480 | since malloc really allocates in units of powers of two | |
481 | and uses 4 bytes for its own overhead. */ | |
482 | ||
483 | #define CONS_BLOCK_SIZE \ | |
484 | ((1020 - sizeof (struct cons_block *)) / sizeof (struct Lisp_Cons)) | |
485 | ||
486 | struct cons_block | |
487 | { | |
488 | struct cons_block *next; | |
489 | struct Lisp_Cons conses[CONS_BLOCK_SIZE]; | |
490 | }; | |
491 | ||
492 | struct cons_block *cons_block; | |
493 | int cons_block_index; | |
494 | ||
495 | struct Lisp_Cons *cons_free_list; | |
496 | ||
497 | void | |
498 | init_cons () | |
499 | { | |
500 | cons_block = (struct cons_block *) malloc (sizeof (struct cons_block)); | |
501 | cons_block->next = 0; | |
502 | bzero (cons_block->conses, sizeof cons_block->conses); | |
503 | cons_block_index = 0; | |
504 | cons_free_list = 0; | |
505 | } | |
506 | ||
507 | /* Explicitly free a cons cell. */ | |
508 | free_cons (ptr) | |
509 | struct Lisp_Cons *ptr; | |
510 | { | |
85481507 | 511 | *(struct Lisp_Cons **)&ptr->car = cons_free_list; |
7146af97 JB |
512 | cons_free_list = ptr; |
513 | } | |
514 | ||
515 | DEFUN ("cons", Fcons, Scons, 2, 2, 0, | |
516 | "Create a new cons, give it CAR and CDR as components, and return it.") | |
517 | (car, cdr) | |
518 | Lisp_Object car, cdr; | |
519 | { | |
520 | register Lisp_Object val; | |
521 | ||
522 | if (cons_free_list) | |
523 | { | |
45d12a89 | 524 | XSETCONS (val, cons_free_list); |
85481507 | 525 | cons_free_list = *(struct Lisp_Cons **)&cons_free_list->car; |
7146af97 JB |
526 | } |
527 | else | |
528 | { | |
529 | if (cons_block_index == CONS_BLOCK_SIZE) | |
530 | { | |
9ac0d9e0 | 531 | register struct cons_block *new = (struct cons_block *) xmalloc (sizeof (struct cons_block)); |
7146af97 JB |
532 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
533 | new->next = cons_block; | |
534 | cons_block = new; | |
535 | cons_block_index = 0; | |
536 | } | |
45d12a89 | 537 | XSETCONS (val, &cons_block->conses[cons_block_index++]); |
7146af97 JB |
538 | } |
539 | XCONS (val)->car = car; | |
540 | XCONS (val)->cdr = cdr; | |
541 | consing_since_gc += sizeof (struct Lisp_Cons); | |
542 | return val; | |
543 | } | |
544 | ||
545 | DEFUN ("list", Flist, Slist, 0, MANY, 0, | |
546 | "Return a newly created list with specified arguments as elements.\n\ | |
547 | Any number of arguments, even zero arguments, are allowed.") | |
548 | (nargs, args) | |
549 | int nargs; | |
550 | register Lisp_Object *args; | |
551 | { | |
552 | register Lisp_Object len, val, val_tail; | |
553 | ||
67ba9986 | 554 | XSETFASTINT (len, nargs); |
7146af97 JB |
555 | val = Fmake_list (len, Qnil); |
556 | val_tail = val; | |
265a9e55 | 557 | while (!NILP (val_tail)) |
7146af97 JB |
558 | { |
559 | XCONS (val_tail)->car = *args++; | |
560 | val_tail = XCONS (val_tail)->cdr; | |
561 | } | |
562 | return val; | |
563 | } | |
564 | ||
565 | DEFUN ("make-list", Fmake_list, Smake_list, 2, 2, 0, | |
566 | "Return a newly created list of length LENGTH, with each element being INIT.") | |
567 | (length, init) | |
568 | register Lisp_Object length, init; | |
569 | { | |
570 | register Lisp_Object val; | |
571 | register int size; | |
572 | ||
c9dad5ed KH |
573 | CHECK_NATNUM (length, 0); |
574 | size = XFASTINT (length); | |
7146af97 JB |
575 | |
576 | val = Qnil; | |
577 | while (size-- > 0) | |
578 | val = Fcons (init, val); | |
579 | return val; | |
580 | } | |
581 | \f | |
582 | /* Allocation of vectors */ | |
583 | ||
584 | struct Lisp_Vector *all_vectors; | |
585 | ||
1825c68d KH |
586 | struct Lisp_Vector * |
587 | allocate_vectorlike (len) | |
588 | EMACS_INT len; | |
589 | { | |
590 | struct Lisp_Vector *p; | |
591 | ||
592 | p = (struct Lisp_Vector *)xmalloc (sizeof (struct Lisp_Vector) | |
593 | + (len - 1) * sizeof (Lisp_Object)); | |
594 | VALIDATE_LISP_STORAGE (p, 0); | |
595 | consing_since_gc += (sizeof (struct Lisp_Vector) | |
596 | + (len - 1) * sizeof (Lisp_Object)); | |
597 | ||
598 | p->next = all_vectors; | |
599 | all_vectors = p; | |
600 | return p; | |
601 | } | |
602 | ||
7146af97 JB |
603 | DEFUN ("make-vector", Fmake_vector, Smake_vector, 2, 2, 0, |
604 | "Return a newly created vector of length LENGTH, with each element being INIT.\n\ | |
605 | See also the function `vector'.") | |
606 | (length, init) | |
607 | register Lisp_Object length, init; | |
608 | { | |
1825c68d KH |
609 | Lisp_Object vector; |
610 | register EMACS_INT sizei; | |
611 | register int index; | |
7146af97 JB |
612 | register struct Lisp_Vector *p; |
613 | ||
c9dad5ed KH |
614 | CHECK_NATNUM (length, 0); |
615 | sizei = XFASTINT (length); | |
7146af97 | 616 | |
1825c68d | 617 | p = allocate_vectorlike (sizei); |
7146af97 | 618 | p->size = sizei; |
7146af97 JB |
619 | for (index = 0; index < sizei; index++) |
620 | p->contents[index] = init; | |
621 | ||
1825c68d | 622 | XSETVECTOR (vector, p); |
7146af97 JB |
623 | return vector; |
624 | } | |
625 | ||
626 | DEFUN ("vector", Fvector, Svector, 0, MANY, 0, | |
627 | "Return a newly created vector with specified arguments as elements.\n\ | |
628 | Any number of arguments, even zero arguments, are allowed.") | |
629 | (nargs, args) | |
630 | register int nargs; | |
631 | Lisp_Object *args; | |
632 | { | |
633 | register Lisp_Object len, val; | |
634 | register int index; | |
635 | register struct Lisp_Vector *p; | |
636 | ||
67ba9986 | 637 | XSETFASTINT (len, nargs); |
7146af97 JB |
638 | val = Fmake_vector (len, Qnil); |
639 | p = XVECTOR (val); | |
640 | for (index = 0; index < nargs; index++) | |
641 | p->contents[index] = args[index]; | |
642 | return val; | |
643 | } | |
644 | ||
645 | DEFUN ("make-byte-code", Fmake_byte_code, Smake_byte_code, 4, MANY, 0, | |
646 | "Create a byte-code object with specified arguments as elements.\n\ | |
647 | The arguments should be the arglist, bytecode-string, constant vector,\n\ | |
648 | stack size, (optional) doc string, and (optional) interactive spec.\n\ | |
649 | The first four arguments are required; at most six have any\n\ | |
650 | significance.") | |
651 | (nargs, args) | |
652 | register int nargs; | |
653 | Lisp_Object *args; | |
654 | { | |
655 | register Lisp_Object len, val; | |
656 | register int index; | |
657 | register struct Lisp_Vector *p; | |
658 | ||
67ba9986 | 659 | XSETFASTINT (len, nargs); |
265a9e55 | 660 | if (!NILP (Vpurify_flag)) |
7146af97 JB |
661 | val = make_pure_vector (len); |
662 | else | |
663 | val = Fmake_vector (len, Qnil); | |
664 | p = XVECTOR (val); | |
665 | for (index = 0; index < nargs; index++) | |
666 | { | |
265a9e55 | 667 | if (!NILP (Vpurify_flag)) |
7146af97 JB |
668 | args[index] = Fpurecopy (args[index]); |
669 | p->contents[index] = args[index]; | |
670 | } | |
169ee243 | 671 | XSETCOMPILED (val, val); |
7146af97 JB |
672 | return val; |
673 | } | |
674 | \f | |
675 | /* Allocation of symbols. | |
676 | Just like allocation of conses! | |
677 | ||
678 | Each symbol_block is just under 1020 bytes long, | |
679 | since malloc really allocates in units of powers of two | |
680 | and uses 4 bytes for its own overhead. */ | |
681 | ||
682 | #define SYMBOL_BLOCK_SIZE \ | |
683 | ((1020 - sizeof (struct symbol_block *)) / sizeof (struct Lisp_Symbol)) | |
684 | ||
685 | struct symbol_block | |
686 | { | |
687 | struct symbol_block *next; | |
688 | struct Lisp_Symbol symbols[SYMBOL_BLOCK_SIZE]; | |
689 | }; | |
690 | ||
691 | struct symbol_block *symbol_block; | |
692 | int symbol_block_index; | |
693 | ||
694 | struct Lisp_Symbol *symbol_free_list; | |
695 | ||
696 | void | |
697 | init_symbol () | |
698 | { | |
699 | symbol_block = (struct symbol_block *) malloc (sizeof (struct symbol_block)); | |
700 | symbol_block->next = 0; | |
701 | bzero (symbol_block->symbols, sizeof symbol_block->symbols); | |
702 | symbol_block_index = 0; | |
703 | symbol_free_list = 0; | |
704 | } | |
705 | ||
706 | DEFUN ("make-symbol", Fmake_symbol, Smake_symbol, 1, 1, 0, | |
707 | "Return a newly allocated uninterned symbol whose name is NAME.\n\ | |
708 | Its value and function definition are void, and its property list is nil.") | |
709 | (str) | |
710 | Lisp_Object str; | |
711 | { | |
712 | register Lisp_Object val; | |
713 | register struct Lisp_Symbol *p; | |
714 | ||
715 | CHECK_STRING (str, 0); | |
716 | ||
717 | if (symbol_free_list) | |
718 | { | |
45d12a89 | 719 | XSETSYMBOL (val, symbol_free_list); |
85481507 | 720 | symbol_free_list = *(struct Lisp_Symbol **)&symbol_free_list->value; |
7146af97 JB |
721 | } |
722 | else | |
723 | { | |
724 | if (symbol_block_index == SYMBOL_BLOCK_SIZE) | |
725 | { | |
9ac0d9e0 | 726 | struct symbol_block *new = (struct symbol_block *) xmalloc (sizeof (struct symbol_block)); |
7146af97 JB |
727 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
728 | new->next = symbol_block; | |
729 | symbol_block = new; | |
730 | symbol_block_index = 0; | |
731 | } | |
45d12a89 | 732 | XSETSYMBOL (val, &symbol_block->symbols[symbol_block_index++]); |
7146af97 JB |
733 | } |
734 | p = XSYMBOL (val); | |
735 | p->name = XSTRING (str); | |
736 | p->plist = Qnil; | |
737 | p->value = Qunbound; | |
738 | p->function = Qunbound; | |
739 | p->next = 0; | |
740 | consing_since_gc += sizeof (struct Lisp_Symbol); | |
741 | return val; | |
742 | } | |
743 | \f | |
a0a38eb7 | 744 | /* Allocation of markers and other objects that share that structure. |
7146af97 JB |
745 | Works like allocation of conses. */ |
746 | ||
747 | #define MARKER_BLOCK_SIZE \ | |
a0a38eb7 | 748 | ((1020 - sizeof (struct marker_block *)) / sizeof (union Lisp_Misc)) |
7146af97 JB |
749 | |
750 | struct marker_block | |
751 | { | |
752 | struct marker_block *next; | |
a0a38eb7 | 753 | union Lisp_Misc markers[MARKER_BLOCK_SIZE]; |
7146af97 JB |
754 | }; |
755 | ||
756 | struct marker_block *marker_block; | |
757 | int marker_block_index; | |
758 | ||
a0a38eb7 | 759 | union Lisp_Misc *marker_free_list; |
7146af97 JB |
760 | |
761 | void | |
762 | init_marker () | |
763 | { | |
764 | marker_block = (struct marker_block *) malloc (sizeof (struct marker_block)); | |
765 | marker_block->next = 0; | |
766 | bzero (marker_block->markers, sizeof marker_block->markers); | |
767 | marker_block_index = 0; | |
768 | marker_free_list = 0; | |
769 | } | |
770 | ||
a0a38eb7 KH |
771 | /* Return a newly allocated Lisp_Misc object, with no substructure. */ |
772 | Lisp_Object | |
773 | allocate_misc () | |
7146af97 | 774 | { |
a0a38eb7 | 775 | Lisp_Object val; |
e065a56e | 776 | |
7146af97 JB |
777 | if (marker_free_list) |
778 | { | |
a0a38eb7 KH |
779 | XSETMISC (val, marker_free_list); |
780 | marker_free_list = marker_free_list->u_free.chain; | |
7146af97 JB |
781 | } |
782 | else | |
783 | { | |
784 | if (marker_block_index == MARKER_BLOCK_SIZE) | |
785 | { | |
a0a38eb7 KH |
786 | struct marker_block *new |
787 | = (struct marker_block *) xmalloc (sizeof (struct marker_block)); | |
7146af97 JB |
788 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
789 | new->next = marker_block; | |
790 | marker_block = new; | |
791 | marker_block_index = 0; | |
792 | } | |
a0a38eb7 | 793 | XSETMISC (val, &marker_block->markers[marker_block_index++]); |
7146af97 | 794 | } |
a0a38eb7 KH |
795 | consing_since_gc += sizeof (union Lisp_Misc); |
796 | return val; | |
797 | } | |
798 | ||
799 | DEFUN ("make-marker", Fmake_marker, Smake_marker, 0, 0, 0, | |
800 | "Return a newly allocated marker which does not point at any place.") | |
801 | () | |
802 | { | |
803 | register Lisp_Object val; | |
804 | register struct Lisp_Marker *p; | |
805 | ||
806 | val = allocate_misc (); | |
807 | XMISC (val)->type = Lisp_Misc_Marker; | |
7146af97 JB |
808 | p = XMARKER (val); |
809 | p->buffer = 0; | |
810 | p->bufpos = 0; | |
811 | p->chain = Qnil; | |
7146af97 JB |
812 | return val; |
813 | } | |
814 | \f | |
815 | /* Allocation of strings */ | |
816 | ||
817 | /* Strings reside inside of string_blocks. The entire data of the string, | |
818 | both the size and the contents, live in part of the `chars' component of a string_block. | |
819 | The `pos' component is the index within `chars' of the first free byte. | |
820 | ||
821 | first_string_block points to the first string_block ever allocated. | |
822 | Each block points to the next one with its `next' field. | |
823 | The `prev' fields chain in reverse order. | |
824 | The last one allocated is the one currently being filled. | |
825 | current_string_block points to it. | |
826 | ||
827 | The string_blocks that hold individual large strings | |
828 | go in a separate chain, started by large_string_blocks. */ | |
829 | ||
830 | ||
831 | /* String blocks contain this many useful bytes. | |
832 | 8188 is power of 2, minus 4 for malloc overhead. */ | |
833 | #define STRING_BLOCK_SIZE (8188 - sizeof (struct string_block_head)) | |
834 | ||
835 | /* A string bigger than this gets its own specially-made string block | |
836 | if it doesn't fit in the current one. */ | |
837 | #define STRING_BLOCK_OUTSIZE 1024 | |
838 | ||
839 | struct string_block_head | |
840 | { | |
841 | struct string_block *next, *prev; | |
842 | int pos; | |
843 | }; | |
844 | ||
845 | struct string_block | |
846 | { | |
847 | struct string_block *next, *prev; | |
42607681 | 848 | EMACS_INT pos; |
7146af97 JB |
849 | char chars[STRING_BLOCK_SIZE]; |
850 | }; | |
851 | ||
852 | /* This points to the string block we are now allocating strings. */ | |
853 | ||
854 | struct string_block *current_string_block; | |
855 | ||
856 | /* This points to the oldest string block, the one that starts the chain. */ | |
857 | ||
858 | struct string_block *first_string_block; | |
859 | ||
860 | /* Last string block in chain of those made for individual large strings. */ | |
861 | ||
862 | struct string_block *large_string_blocks; | |
863 | ||
864 | /* If SIZE is the length of a string, this returns how many bytes | |
865 | the string occupies in a string_block (including padding). */ | |
866 | ||
867 | #define STRING_FULLSIZE(size) (((size) + sizeof (struct Lisp_String) + PAD) \ | |
868 | & ~(PAD - 1)) | |
42607681 | 869 | #define PAD (sizeof (EMACS_INT)) |
7146af97 JB |
870 | |
871 | #if 0 | |
872 | #define STRING_FULLSIZE(SIZE) \ | |
42607681 | 873 | (((SIZE) + 2 * sizeof (EMACS_INT)) & ~(sizeof (EMACS_INT) - 1)) |
7146af97 JB |
874 | #endif |
875 | ||
876 | void | |
877 | init_strings () | |
878 | { | |
879 | current_string_block = (struct string_block *) malloc (sizeof (struct string_block)); | |
880 | first_string_block = current_string_block; | |
881 | consing_since_gc += sizeof (struct string_block); | |
882 | current_string_block->next = 0; | |
883 | current_string_block->prev = 0; | |
884 | current_string_block->pos = 0; | |
885 | large_string_blocks = 0; | |
886 | } | |
887 | ||
888 | DEFUN ("make-string", Fmake_string, Smake_string, 2, 2, 0, | |
889 | "Return a newly created string of length LENGTH, with each element being INIT.\n\ | |
890 | Both LENGTH and INIT must be numbers.") | |
891 | (length, init) | |
892 | Lisp_Object length, init; | |
893 | { | |
894 | register Lisp_Object val; | |
895 | register unsigned char *p, *end, c; | |
896 | ||
c9dad5ed | 897 | CHECK_NATNUM (length, 0); |
7146af97 | 898 | CHECK_NUMBER (init, 1); |
c9dad5ed | 899 | val = make_uninit_string (XFASTINT (length)); |
7146af97 JB |
900 | c = XINT (init); |
901 | p = XSTRING (val)->data; | |
902 | end = p + XSTRING (val)->size; | |
903 | while (p != end) | |
904 | *p++ = c; | |
905 | *p = 0; | |
906 | return val; | |
907 | } | |
908 | ||
909 | Lisp_Object | |
910 | make_string (contents, length) | |
911 | char *contents; | |
912 | int length; | |
913 | { | |
914 | register Lisp_Object val; | |
915 | val = make_uninit_string (length); | |
916 | bcopy (contents, XSTRING (val)->data, length); | |
917 | return val; | |
918 | } | |
919 | ||
920 | Lisp_Object | |
921 | build_string (str) | |
922 | char *str; | |
923 | { | |
924 | return make_string (str, strlen (str)); | |
925 | } | |
926 | ||
927 | Lisp_Object | |
928 | make_uninit_string (length) | |
929 | int length; | |
930 | { | |
931 | register Lisp_Object val; | |
932 | register int fullsize = STRING_FULLSIZE (length); | |
933 | ||
934 | if (length < 0) abort (); | |
935 | ||
936 | if (fullsize <= STRING_BLOCK_SIZE - current_string_block->pos) | |
937 | /* This string can fit in the current string block */ | |
938 | { | |
45d12a89 KH |
939 | XSETSTRING (val, |
940 | ((struct Lisp_String *) | |
941 | (current_string_block->chars + current_string_block->pos))); | |
7146af97 JB |
942 | current_string_block->pos += fullsize; |
943 | } | |
944 | else if (fullsize > STRING_BLOCK_OUTSIZE) | |
945 | /* This string gets its own string block */ | |
946 | { | |
947 | register struct string_block *new | |
9ac0d9e0 | 948 | = (struct string_block *) xmalloc (sizeof (struct string_block_head) + fullsize); |
7146af97 | 949 | VALIDATE_LISP_STORAGE (new, 0); |
7146af97 JB |
950 | consing_since_gc += sizeof (struct string_block_head) + fullsize; |
951 | new->pos = fullsize; | |
952 | new->next = large_string_blocks; | |
953 | large_string_blocks = new; | |
45d12a89 KH |
954 | XSETSTRING (val, |
955 | ((struct Lisp_String *) | |
956 | ((struct string_block_head *)new + 1))); | |
7146af97 JB |
957 | } |
958 | else | |
959 | /* Make a new current string block and start it off with this string */ | |
960 | { | |
961 | register struct string_block *new | |
9ac0d9e0 | 962 | = (struct string_block *) xmalloc (sizeof (struct string_block)); |
7146af97 JB |
963 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
964 | consing_since_gc += sizeof (struct string_block); | |
965 | current_string_block->next = new; | |
966 | new->prev = current_string_block; | |
967 | new->next = 0; | |
968 | current_string_block = new; | |
969 | new->pos = fullsize; | |
45d12a89 KH |
970 | XSETSTRING (val, |
971 | (struct Lisp_String *) current_string_block->chars); | |
7146af97 JB |
972 | } |
973 | ||
974 | XSTRING (val)->size = length; | |
975 | XSTRING (val)->data[length] = 0; | |
d5e35230 | 976 | INITIALIZE_INTERVAL (XSTRING (val), NULL_INTERVAL); |
7146af97 JB |
977 | |
978 | return val; | |
979 | } | |
980 | ||
981 | /* Return a newly created vector or string with specified arguments as | |
736471d1 RS |
982 | elements. If all the arguments are characters that can fit |
983 | in a string of events, make a string; otherwise, make a vector. | |
984 | ||
985 | Any number of arguments, even zero arguments, are allowed. */ | |
7146af97 JB |
986 | |
987 | Lisp_Object | |
736471d1 | 988 | make_event_array (nargs, args) |
7146af97 JB |
989 | register int nargs; |
990 | Lisp_Object *args; | |
991 | { | |
992 | int i; | |
993 | ||
994 | for (i = 0; i < nargs; i++) | |
736471d1 | 995 | /* The things that fit in a string |
c9ca4659 RS |
996 | are characters that are in 0...127, |
997 | after discarding the meta bit and all the bits above it. */ | |
e687453f | 998 | if (!INTEGERP (args[i]) |
c9ca4659 | 999 | || (XUINT (args[i]) & ~(-CHAR_META)) >= 0200) |
7146af97 JB |
1000 | return Fvector (nargs, args); |
1001 | ||
1002 | /* Since the loop exited, we know that all the things in it are | |
1003 | characters, so we can make a string. */ | |
1004 | { | |
c13ccad2 | 1005 | Lisp_Object result; |
7146af97 | 1006 | |
c13ccad2 | 1007 | result = Fmake_string (nargs, make_number (0)); |
7146af97 | 1008 | for (i = 0; i < nargs; i++) |
736471d1 RS |
1009 | { |
1010 | XSTRING (result)->data[i] = XINT (args[i]); | |
1011 | /* Move the meta bit to the right place for a string char. */ | |
1012 | if (XINT (args[i]) & CHAR_META) | |
1013 | XSTRING (result)->data[i] |= 0x80; | |
1014 | } | |
7146af97 JB |
1015 | |
1016 | return result; | |
1017 | } | |
1018 | } | |
1019 | \f | |
1a4f1e2c JB |
1020 | /* Pure storage management. */ |
1021 | ||
7146af97 JB |
1022 | /* Must get an error if pure storage is full, |
1023 | since if it cannot hold a large string | |
1024 | it may be able to hold conses that point to that string; | |
1025 | then the string is not protected from gc. */ | |
1026 | ||
1027 | Lisp_Object | |
1028 | make_pure_string (data, length) | |
1029 | char *data; | |
1030 | int length; | |
1031 | { | |
1032 | register Lisp_Object new; | |
42607681 | 1033 | register int size = sizeof (EMACS_INT) + INTERVAL_PTR_SIZE + length + 1; |
7146af97 JB |
1034 | |
1035 | if (pureptr + size > PURESIZE) | |
1036 | error ("Pure Lisp storage exhausted"); | |
45d12a89 | 1037 | XSETSTRING (new, PUREBEG + pureptr); |
7146af97 JB |
1038 | XSTRING (new)->size = length; |
1039 | bcopy (data, XSTRING (new)->data, length); | |
1040 | XSTRING (new)->data[length] = 0; | |
06c5fe00 RS |
1041 | |
1042 | /* We must give strings in pure storage some kind of interval. So we | |
1043 | give them a null one. */ | |
1044 | #if defined (USE_TEXT_PROPERTIES) | |
1045 | XSTRING (new)->intervals = NULL_INTERVAL; | |
1046 | #endif | |
42607681 RS |
1047 | pureptr += (size + sizeof (EMACS_INT) - 1) |
1048 | / sizeof (EMACS_INT) * sizeof (EMACS_INT); | |
7146af97 JB |
1049 | return new; |
1050 | } | |
1051 | ||
1052 | Lisp_Object | |
1053 | pure_cons (car, cdr) | |
1054 | Lisp_Object car, cdr; | |
1055 | { | |
1056 | register Lisp_Object new; | |
1057 | ||
1058 | if (pureptr + sizeof (struct Lisp_Cons) > PURESIZE) | |
1059 | error ("Pure Lisp storage exhausted"); | |
45d12a89 | 1060 | XSETCONS (new, PUREBEG + pureptr); |
7146af97 JB |
1061 | pureptr += sizeof (struct Lisp_Cons); |
1062 | XCONS (new)->car = Fpurecopy (car); | |
1063 | XCONS (new)->cdr = Fpurecopy (cdr); | |
1064 | return new; | |
1065 | } | |
1066 | ||
1067 | #ifdef LISP_FLOAT_TYPE | |
1068 | ||
1069 | Lisp_Object | |
1070 | make_pure_float (num) | |
1071 | double num; | |
1072 | { | |
1073 | register Lisp_Object new; | |
1074 | ||
6d19f28a JB |
1075 | /* Make sure that PUREBEG + pureptr is aligned on at least a sizeof |
1076 | (double) boundary. Some architectures (like the sparc) require | |
1077 | this, and I suspect that floats are rare enough that it's no | |
1078 | tragedy for those that do. */ | |
1079 | { | |
1080 | int alignment; | |
1081 | char *p = PUREBEG + pureptr; | |
1082 | ||
fe90ad97 JB |
1083 | #ifdef __GNUC__ |
1084 | #if __GNUC__ >= 2 | |
6d19f28a | 1085 | alignment = __alignof (struct Lisp_Float); |
fe90ad97 | 1086 | #else |
6d19f28a | 1087 | alignment = sizeof (struct Lisp_Float); |
fe90ad97 JB |
1088 | #endif |
1089 | #else | |
6d19f28a | 1090 | alignment = sizeof (struct Lisp_Float); |
fe90ad97 | 1091 | #endif |
6d19f28a JB |
1092 | p = (char *) (((unsigned long) p + alignment - 1) & - alignment); |
1093 | pureptr = p - PUREBEG; | |
1094 | } | |
1a4f1e2c | 1095 | |
7146af97 JB |
1096 | if (pureptr + sizeof (struct Lisp_Float) > PURESIZE) |
1097 | error ("Pure Lisp storage exhausted"); | |
45d12a89 | 1098 | XSETFLOAT (new, PUREBEG + pureptr); |
7146af97 JB |
1099 | pureptr += sizeof (struct Lisp_Float); |
1100 | XFLOAT (new)->data = num; | |
67ba9986 | 1101 | XSETFASTINT (XFLOAT (new)->type, 0); /* bug chasing -wsr */ |
7146af97 JB |
1102 | return new; |
1103 | } | |
1104 | ||
1105 | #endif /* LISP_FLOAT_TYPE */ | |
1106 | ||
1107 | Lisp_Object | |
1108 | make_pure_vector (len) | |
42607681 | 1109 | EMACS_INT len; |
7146af97 JB |
1110 | { |
1111 | register Lisp_Object new; | |
42607681 | 1112 | register EMACS_INT size = sizeof (struct Lisp_Vector) + (len - 1) * sizeof (Lisp_Object); |
7146af97 JB |
1113 | |
1114 | if (pureptr + size > PURESIZE) | |
1115 | error ("Pure Lisp storage exhausted"); | |
1116 | ||
45d12a89 | 1117 | XSETVECTOR (new, PUREBEG + pureptr); |
7146af97 JB |
1118 | pureptr += size; |
1119 | XVECTOR (new)->size = len; | |
1120 | return new; | |
1121 | } | |
1122 | ||
1123 | DEFUN ("purecopy", Fpurecopy, Spurecopy, 1, 1, 0, | |
1124 | "Make a copy of OBJECT in pure storage.\n\ | |
1125 | Recursively copies contents of vectors and cons cells.\n\ | |
1126 | Does not copy symbols.") | |
1127 | (obj) | |
1128 | register Lisp_Object obj; | |
1129 | { | |
265a9e55 | 1130 | if (NILP (Vpurify_flag)) |
7146af97 JB |
1131 | return obj; |
1132 | ||
1133 | if ((PNTR_COMPARISON_TYPE) XPNTR (obj) < (PNTR_COMPARISON_TYPE) ((char *) pure + PURESIZE) | |
1134 | && (PNTR_COMPARISON_TYPE) XPNTR (obj) >= (PNTR_COMPARISON_TYPE) pure) | |
1135 | return obj; | |
1136 | ||
d6dd74bb KH |
1137 | if (CONSP (obj)) |
1138 | return pure_cons (XCONS (obj)->car, XCONS (obj)->cdr); | |
7146af97 | 1139 | #ifdef LISP_FLOAT_TYPE |
d6dd74bb KH |
1140 | else if (FLOATP (obj)) |
1141 | return make_pure_float (XFLOAT (obj)->data); | |
7146af97 | 1142 | #endif /* LISP_FLOAT_TYPE */ |
d6dd74bb KH |
1143 | else if (STRINGP (obj)) |
1144 | return make_pure_string (XSTRING (obj)->data, XSTRING (obj)->size); | |
1145 | else if (COMPILEDP (obj) || VECTORP (obj)) | |
1146 | { | |
1147 | register struct Lisp_Vector *vec; | |
1148 | register int i, size; | |
1149 | ||
1150 | size = XVECTOR (obj)->size; | |
1151 | vec = XVECTOR (make_pure_vector (size)); | |
1152 | for (i = 0; i < size; i++) | |
1153 | vec->contents[i] = Fpurecopy (XVECTOR (obj)->contents[i]); | |
1154 | if (COMPILEDP (obj)) | |
1155 | XSETCOMPILED (obj, vec); | |
1156 | else | |
1157 | XSETVECTOR (obj, vec); | |
7146af97 JB |
1158 | return obj; |
1159 | } | |
d6dd74bb KH |
1160 | else if (MARKERP (obj)) |
1161 | error ("Attempt to copy a marker to pure storage"); | |
1162 | else | |
1163 | return obj; | |
7146af97 JB |
1164 | } |
1165 | \f | |
1166 | /* Recording what needs to be marked for gc. */ | |
1167 | ||
1168 | struct gcpro *gcprolist; | |
1169 | ||
daa37602 | 1170 | #define NSTATICS 512 |
7146af97 JB |
1171 | |
1172 | Lisp_Object *staticvec[NSTATICS] = {0}; | |
1173 | ||
1174 | int staticidx = 0; | |
1175 | ||
1176 | /* Put an entry in staticvec, pointing at the variable whose address is given */ | |
1177 | ||
1178 | void | |
1179 | staticpro (varaddress) | |
1180 | Lisp_Object *varaddress; | |
1181 | { | |
1182 | staticvec[staticidx++] = varaddress; | |
1183 | if (staticidx >= NSTATICS) | |
1184 | abort (); | |
1185 | } | |
1186 | ||
1187 | struct catchtag | |
1188 | { | |
1189 | Lisp_Object tag; | |
1190 | Lisp_Object val; | |
1191 | struct catchtag *next; | |
1192 | /* jmp_buf jmp; /* We don't need this for GC purposes */ | |
1193 | }; | |
1194 | ||
1195 | struct backtrace | |
1196 | { | |
1197 | struct backtrace *next; | |
1198 | Lisp_Object *function; | |
1199 | Lisp_Object *args; /* Points to vector of args. */ | |
1200 | int nargs; /* length of vector */ | |
1201 | /* if nargs is UNEVALLED, args points to slot holding list of unevalled args */ | |
1202 | char evalargs; | |
1203 | }; | |
7146af97 | 1204 | \f |
1a4f1e2c JB |
1205 | /* Garbage collection! */ |
1206 | ||
7146af97 JB |
1207 | int total_conses, total_markers, total_symbols, total_string_size, total_vector_size; |
1208 | int total_free_conses, total_free_markers, total_free_symbols; | |
1209 | #ifdef LISP_FLOAT_TYPE | |
1210 | int total_free_floats, total_floats; | |
1211 | #endif /* LISP_FLOAT_TYPE */ | |
1212 | ||
7146af97 JB |
1213 | DEFUN ("garbage-collect", Fgarbage_collect, Sgarbage_collect, 0, 0, "", |
1214 | "Reclaim storage for Lisp objects no longer needed.\n\ | |
1215 | Returns info on amount of space in use:\n\ | |
1216 | ((USED-CONSES . FREE-CONSES) (USED-SYMS . FREE-SYMS)\n\ | |
1217 | (USED-MARKERS . FREE-MARKERS) USED-STRING-CHARS USED-VECTOR-SLOTS\n\ | |
1218 | (USED-FLOATS . FREE-FLOATS))\n\ | |
1219 | Garbage collection happens automatically if you cons more than\n\ | |
1220 | `gc-cons-threshold' bytes of Lisp data since previous garbage collection.") | |
1221 | () | |
1222 | { | |
1223 | register struct gcpro *tail; | |
1224 | register struct specbinding *bind; | |
1225 | struct catchtag *catch; | |
1226 | struct handler *handler; | |
1227 | register struct backtrace *backlist; | |
1228 | register Lisp_Object tem; | |
1229 | char *omessage = echo_area_glyphs; | |
51056d11 | 1230 | int omessage_length = echo_area_glyphs_length; |
7146af97 JB |
1231 | char stack_top_variable; |
1232 | register int i; | |
1233 | ||
7146af97 JB |
1234 | /* Save a copy of the contents of the stack, for debugging. */ |
1235 | #if MAX_SAVE_STACK > 0 | |
265a9e55 | 1236 | if (NILP (Vpurify_flag)) |
7146af97 JB |
1237 | { |
1238 | i = &stack_top_variable - stack_bottom; | |
1239 | if (i < 0) i = -i; | |
1240 | if (i < MAX_SAVE_STACK) | |
1241 | { | |
1242 | if (stack_copy == 0) | |
9ac0d9e0 | 1243 | stack_copy = (char *) xmalloc (stack_copy_size = i); |
7146af97 | 1244 | else if (stack_copy_size < i) |
9ac0d9e0 | 1245 | stack_copy = (char *) xrealloc (stack_copy, (stack_copy_size = i)); |
7146af97 JB |
1246 | if (stack_copy) |
1247 | { | |
42607681 | 1248 | if ((EMACS_INT) (&stack_top_variable - stack_bottom) > 0) |
7146af97 JB |
1249 | bcopy (stack_bottom, stack_copy, i); |
1250 | else | |
1251 | bcopy (&stack_top_variable, stack_copy, i); | |
1252 | } | |
1253 | } | |
1254 | } | |
1255 | #endif /* MAX_SAVE_STACK > 0 */ | |
1256 | ||
1257 | if (!noninteractive) | |
1258 | message1 ("Garbage collecting..."); | |
1259 | ||
1260 | /* Don't keep command history around forever */ | |
1261 | tem = Fnthcdr (make_number (30), Vcommand_history); | |
1262 | if (CONSP (tem)) | |
1263 | XCONS (tem)->cdr = Qnil; | |
ffd56f97 | 1264 | |
7146af97 JB |
1265 | /* Likewise for undo information. */ |
1266 | { | |
1267 | register struct buffer *nextb = all_buffers; | |
1268 | ||
1269 | while (nextb) | |
1270 | { | |
ffd56f97 JB |
1271 | /* If a buffer's undo list is Qt, that means that undo is |
1272 | turned off in that buffer. Calling truncate_undo_list on | |
1273 | Qt tends to return NULL, which effectively turns undo back on. | |
1274 | So don't call truncate_undo_list if undo_list is Qt. */ | |
1275 | if (! EQ (nextb->undo_list, Qt)) | |
1276 | nextb->undo_list | |
502b9b64 JB |
1277 | = truncate_undo_list (nextb->undo_list, undo_limit, |
1278 | undo_strong_limit); | |
7146af97 JB |
1279 | nextb = nextb->next; |
1280 | } | |
1281 | } | |
1282 | ||
1283 | gc_in_progress = 1; | |
1284 | ||
1285 | /* clear_marks (); */ | |
1286 | ||
1287 | /* In each "large string", set the MARKBIT of the size field. | |
1288 | That enables mark_object to recognize them. */ | |
1289 | { | |
1290 | register struct string_block *b; | |
1291 | for (b = large_string_blocks; b; b = b->next) | |
1292 | ((struct Lisp_String *)(&b->chars[0]))->size |= MARKBIT; | |
1293 | } | |
1294 | ||
1295 | /* Mark all the special slots that serve as the roots of accessibility. | |
1296 | ||
1297 | Usually the special slots to mark are contained in particular structures. | |
1298 | Then we know no slot is marked twice because the structures don't overlap. | |
1299 | In some cases, the structures point to the slots to be marked. | |
1300 | For these, we use MARKBIT to avoid double marking of the slot. */ | |
1301 | ||
1302 | for (i = 0; i < staticidx; i++) | |
1303 | mark_object (staticvec[i]); | |
1304 | for (tail = gcprolist; tail; tail = tail->next) | |
1305 | for (i = 0; i < tail->nvars; i++) | |
1306 | if (!XMARKBIT (tail->var[i])) | |
1307 | { | |
1308 | mark_object (&tail->var[i]); | |
1309 | XMARK (tail->var[i]); | |
1310 | } | |
1311 | for (bind = specpdl; bind != specpdl_ptr; bind++) | |
1312 | { | |
1313 | mark_object (&bind->symbol); | |
1314 | mark_object (&bind->old_value); | |
1315 | } | |
1316 | for (catch = catchlist; catch; catch = catch->next) | |
1317 | { | |
1318 | mark_object (&catch->tag); | |
1319 | mark_object (&catch->val); | |
1320 | } | |
1321 | for (handler = handlerlist; handler; handler = handler->next) | |
1322 | { | |
1323 | mark_object (&handler->handler); | |
1324 | mark_object (&handler->var); | |
1325 | } | |
1326 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
1327 | { | |
1328 | if (!XMARKBIT (*backlist->function)) | |
1329 | { | |
1330 | mark_object (backlist->function); | |
1331 | XMARK (*backlist->function); | |
1332 | } | |
1333 | if (backlist->nargs == UNEVALLED || backlist->nargs == MANY) | |
1334 | i = 0; | |
1335 | else | |
1336 | i = backlist->nargs - 1; | |
1337 | for (; i >= 0; i--) | |
1338 | if (!XMARKBIT (backlist->args[i])) | |
1339 | { | |
1340 | mark_object (&backlist->args[i]); | |
1341 | XMARK (backlist->args[i]); | |
1342 | } | |
1343 | } | |
1344 | ||
1345 | gc_sweep (); | |
1346 | ||
1347 | /* Clear the mark bits that we set in certain root slots. */ | |
1348 | ||
1349 | for (tail = gcprolist; tail; tail = tail->next) | |
1350 | for (i = 0; i < tail->nvars; i++) | |
1351 | XUNMARK (tail->var[i]); | |
1352 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
1353 | { | |
1354 | XUNMARK (*backlist->function); | |
1355 | if (backlist->nargs == UNEVALLED || backlist->nargs == MANY) | |
1356 | i = 0; | |
1357 | else | |
1358 | i = backlist->nargs - 1; | |
1359 | for (; i >= 0; i--) | |
1360 | XUNMARK (backlist->args[i]); | |
1361 | } | |
1362 | XUNMARK (buffer_defaults.name); | |
1363 | XUNMARK (buffer_local_symbols.name); | |
1364 | ||
1365 | /* clear_marks (); */ | |
1366 | gc_in_progress = 0; | |
1367 | ||
1368 | consing_since_gc = 0; | |
1369 | if (gc_cons_threshold < 10000) | |
1370 | gc_cons_threshold = 10000; | |
1371 | ||
7d385b05 | 1372 | if (omessage || minibuf_level > 0) |
51056d11 | 1373 | message2 (omessage, omessage_length); |
7146af97 JB |
1374 | else if (!noninteractive) |
1375 | message1 ("Garbage collecting...done"); | |
1376 | ||
7146af97 JB |
1377 | return Fcons (Fcons (make_number (total_conses), |
1378 | make_number (total_free_conses)), | |
1379 | Fcons (Fcons (make_number (total_symbols), | |
1380 | make_number (total_free_symbols)), | |
1381 | Fcons (Fcons (make_number (total_markers), | |
1382 | make_number (total_free_markers)), | |
1383 | Fcons (make_number (total_string_size), | |
1384 | Fcons (make_number (total_vector_size), | |
1385 | ||
1386 | #ifdef LISP_FLOAT_TYPE | |
1387 | Fcons (Fcons (make_number (total_floats), | |
1388 | make_number (total_free_floats)), | |
1389 | Qnil) | |
1390 | #else /* not LISP_FLOAT_TYPE */ | |
1391 | Qnil | |
1392 | #endif /* not LISP_FLOAT_TYPE */ | |
1393 | ))))); | |
1394 | } | |
1395 | \f | |
1396 | #if 0 | |
1397 | static void | |
1398 | clear_marks () | |
1399 | { | |
1400 | /* Clear marks on all conses */ | |
1401 | { | |
1402 | register struct cons_block *cblk; | |
1403 | register int lim = cons_block_index; | |
1404 | ||
1405 | for (cblk = cons_block; cblk; cblk = cblk->next) | |
1406 | { | |
1407 | register int i; | |
1408 | for (i = 0; i < lim; i++) | |
1409 | XUNMARK (cblk->conses[i].car); | |
1410 | lim = CONS_BLOCK_SIZE; | |
1411 | } | |
1412 | } | |
1413 | /* Clear marks on all symbols */ | |
1414 | { | |
1415 | register struct symbol_block *sblk; | |
1416 | register int lim = symbol_block_index; | |
1417 | ||
1418 | for (sblk = symbol_block; sblk; sblk = sblk->next) | |
1419 | { | |
1420 | register int i; | |
1421 | for (i = 0; i < lim; i++) | |
1422 | { | |
1423 | XUNMARK (sblk->symbols[i].plist); | |
1424 | } | |
1425 | lim = SYMBOL_BLOCK_SIZE; | |
1426 | } | |
1427 | } | |
1428 | /* Clear marks on all markers */ | |
1429 | { | |
1430 | register struct marker_block *sblk; | |
1431 | register int lim = marker_block_index; | |
1432 | ||
1433 | for (sblk = marker_block; sblk; sblk = sblk->next) | |
1434 | { | |
1435 | register int i; | |
1436 | for (i = 0; i < lim; i++) | |
a0a38eb7 KH |
1437 | if (sblk->markers[i].type == Lisp_Misc_Marker) |
1438 | XUNMARK (sblk->markers[i].u_marker.chain); | |
7146af97 JB |
1439 | lim = MARKER_BLOCK_SIZE; |
1440 | } | |
1441 | } | |
1442 | /* Clear mark bits on all buffers */ | |
1443 | { | |
1444 | register struct buffer *nextb = all_buffers; | |
1445 | ||
1446 | while (nextb) | |
1447 | { | |
1448 | XUNMARK (nextb->name); | |
1449 | nextb = nextb->next; | |
1450 | } | |
1451 | } | |
1452 | } | |
1453 | #endif | |
1454 | \f | |
1a4f1e2c JB |
1455 | /* Mark reference to a Lisp_Object. |
1456 | If the object referred to has not been seen yet, recursively mark | |
1457 | all the references contained in it. | |
7146af97 | 1458 | |
eb8c3be9 | 1459 | If the object referenced is a short string, the referencing slot |
7146af97 JB |
1460 | is threaded into a chain of such slots, pointed to from |
1461 | the `size' field of the string. The actual string size | |
1462 | lives in the last slot in the chain. We recognize the end | |
1463 | because it is < (unsigned) STRING_BLOCK_SIZE. */ | |
1464 | ||
785cd37f RS |
1465 | #define LAST_MARKED_SIZE 500 |
1466 | Lisp_Object *last_marked[LAST_MARKED_SIZE]; | |
1467 | int last_marked_index; | |
1468 | ||
7146af97 JB |
1469 | static void |
1470 | mark_object (objptr) | |
1471 | Lisp_Object *objptr; | |
1472 | { | |
1473 | register Lisp_Object obj; | |
1474 | ||
9149e743 | 1475 | loop: |
7146af97 | 1476 | obj = *objptr; |
9149e743 | 1477 | loop2: |
7146af97 JB |
1478 | XUNMARK (obj); |
1479 | ||
7146af97 JB |
1480 | if ((PNTR_COMPARISON_TYPE) XPNTR (obj) < (PNTR_COMPARISON_TYPE) ((char *) pure + PURESIZE) |
1481 | && (PNTR_COMPARISON_TYPE) XPNTR (obj) >= (PNTR_COMPARISON_TYPE) pure) | |
1482 | return; | |
1483 | ||
785cd37f RS |
1484 | last_marked[last_marked_index++] = objptr; |
1485 | if (last_marked_index == LAST_MARKED_SIZE) | |
1486 | last_marked_index = 0; | |
1487 | ||
7146af97 JB |
1488 | #ifdef SWITCH_ENUM_BUG |
1489 | switch ((int) XGCTYPE (obj)) | |
1490 | #else | |
1491 | switch (XGCTYPE (obj)) | |
1492 | #endif | |
1493 | { | |
1494 | case Lisp_String: | |
1495 | { | |
1496 | register struct Lisp_String *ptr = XSTRING (obj); | |
1497 | ||
d5e35230 | 1498 | MARK_INTERVAL_TREE (ptr->intervals); |
7146af97 JB |
1499 | if (ptr->size & MARKBIT) |
1500 | /* A large string. Just set ARRAY_MARK_FLAG. */ | |
1501 | ptr->size |= ARRAY_MARK_FLAG; | |
1502 | else | |
1503 | { | |
1504 | /* A small string. Put this reference | |
1505 | into the chain of references to it. | |
1506 | The address OBJPTR is even, so if the address | |
1507 | includes MARKBIT, put it in the low bit | |
1508 | when we store OBJPTR into the size field. */ | |
1509 | ||
1510 | if (XMARKBIT (*objptr)) | |
1511 | { | |
67ba9986 | 1512 | XSETFASTINT (*objptr, ptr->size); |
7146af97 JB |
1513 | XMARK (*objptr); |
1514 | } | |
1515 | else | |
67ba9986 | 1516 | XSETFASTINT (*objptr, ptr->size); |
42607681 RS |
1517 | if ((EMACS_INT) objptr & 1) abort (); |
1518 | ptr->size = (EMACS_INT) objptr & ~MARKBIT; | |
1519 | if ((EMACS_INT) objptr & MARKBIT) | |
7146af97 JB |
1520 | ptr->size ++; |
1521 | } | |
1522 | } | |
1523 | break; | |
1524 | ||
76437631 | 1525 | case Lisp_Vectorlike: |
30e3190a | 1526 | if (GC_BUFFERP (obj)) |
6b552283 KH |
1527 | { |
1528 | if (!XMARKBIT (XBUFFER (obj)->name)) | |
1529 | mark_buffer (obj); | |
1530 | } | |
30e3190a | 1531 | else if (GC_SUBRP (obj)) |
169ee243 RS |
1532 | break; |
1533 | else if (GC_COMPILEDP (obj)) | |
1534 | /* We could treat this just like a vector, but it is better | |
1535 | to save the COMPILED_CONSTANTS element for last and avoid recursion | |
1536 | there. */ | |
1537 | { | |
1538 | register struct Lisp_Vector *ptr = XVECTOR (obj); | |
1539 | register EMACS_INT size = ptr->size; | |
1540 | /* See comment above under Lisp_Vector. */ | |
1541 | struct Lisp_Vector *volatile ptr1 = ptr; | |
1542 | register int i; | |
1543 | ||
1544 | if (size & ARRAY_MARK_FLAG) | |
1545 | break; /* Already marked */ | |
1546 | ptr->size |= ARRAY_MARK_FLAG; /* Else mark it */ | |
76437631 | 1547 | size &= PSEUDOVECTOR_SIZE_MASK; |
169ee243 RS |
1548 | for (i = 0; i < size; i++) /* and then mark its elements */ |
1549 | { | |
1550 | if (i != COMPILED_CONSTANTS) | |
1551 | mark_object (&ptr1->contents[i]); | |
1552 | } | |
1553 | /* This cast should be unnecessary, but some Mips compiler complains | |
1554 | (MIPS-ABI + SysVR4, DC/OSx, etc). */ | |
1555 | objptr = (Lisp_Object *) &ptr1->contents[COMPILED_CONSTANTS]; | |
1556 | goto loop; | |
1557 | } | |
502b9b64 | 1558 | #ifdef MULTI_FRAME |
169ee243 RS |
1559 | else if (GC_FRAMEP (obj)) |
1560 | { | |
1561 | /* See comment above under Lisp_Vector for why this is volatile. */ | |
1562 | register struct frame *volatile ptr = XFRAME (obj); | |
1563 | register EMACS_INT size = ptr->size; | |
1564 | ||
1565 | if (size & ARRAY_MARK_FLAG) break; /* Already marked */ | |
1566 | ptr->size |= ARRAY_MARK_FLAG; /* Else mark it */ | |
1567 | ||
1568 | mark_object (&ptr->name); | |
1569 | mark_object (&ptr->focus_frame); | |
1570 | mark_object (&ptr->selected_window); | |
1571 | mark_object (&ptr->minibuffer_window); | |
1572 | mark_object (&ptr->param_alist); | |
1573 | mark_object (&ptr->scroll_bars); | |
1574 | mark_object (&ptr->condemned_scroll_bars); | |
1575 | mark_object (&ptr->menu_bar_items); | |
1576 | mark_object (&ptr->face_alist); | |
1577 | mark_object (&ptr->menu_bar_vector); | |
1578 | mark_object (&ptr->buffer_predicate); | |
1579 | } | |
12740e58 | 1580 | #endif /* MULTI_FRAME */ |
04ff9756 | 1581 | else |
169ee243 RS |
1582 | { |
1583 | register struct Lisp_Vector *ptr = XVECTOR (obj); | |
1584 | register EMACS_INT size = ptr->size; | |
1585 | /* The reason we use ptr1 is to avoid an apparent hardware bug | |
1586 | that happens occasionally on the FSF's HP 300s. | |
1587 | The bug is that a2 gets clobbered by recursive calls to mark_object. | |
1588 | The clobberage seems to happen during function entry, | |
1589 | perhaps in the moveml instruction. | |
1590 | Yes, this is a crock, but we have to do it. */ | |
1591 | struct Lisp_Vector *volatile ptr1 = ptr; | |
1592 | register int i; | |
1593 | ||
1594 | if (size & ARRAY_MARK_FLAG) break; /* Already marked */ | |
1595 | ptr->size |= ARRAY_MARK_FLAG; /* Else mark it */ | |
1596 | if (size & PSEUDOVECTOR_FLAG) | |
1597 | size &= PSEUDOVECTOR_SIZE_MASK; | |
1598 | for (i = 0; i < size; i++) /* and then mark its elements */ | |
1599 | mark_object (&ptr1->contents[i]); | |
1600 | } | |
1601 | break; | |
7146af97 | 1602 | |
7146af97 JB |
1603 | case Lisp_Symbol: |
1604 | { | |
41f54422 RS |
1605 | /* See comment above under Lisp_Vector for why this is volatile. */ |
1606 | register struct Lisp_Symbol *volatile ptr = XSYMBOL (obj); | |
7146af97 JB |
1607 | struct Lisp_Symbol *ptrx; |
1608 | ||
1609 | if (XMARKBIT (ptr->plist)) break; | |
1610 | XMARK (ptr->plist); | |
7146af97 JB |
1611 | mark_object ((Lisp_Object *) &ptr->value); |
1612 | mark_object (&ptr->function); | |
1613 | mark_object (&ptr->plist); | |
8aaa7c8a JB |
1614 | XSETTYPE (*(Lisp_Object *) &ptr->name, Lisp_String); |
1615 | mark_object (&ptr->name); | |
7146af97 JB |
1616 | ptr = ptr->next; |
1617 | if (ptr) | |
1618 | { | |
9149e743 KH |
1619 | /* For the benefit of the last_marked log. */ |
1620 | objptr = (Lisp_Object *)&XSYMBOL (obj)->next; | |
b0846f52 | 1621 | ptrx = ptr; /* Use of ptrx avoids compiler bug on Sun */ |
7146af97 | 1622 | XSETSYMBOL (obj, ptrx); |
9149e743 KH |
1623 | /* We can't goto loop here because *objptr doesn't contain an |
1624 | actual Lisp_Object with valid datatype field. */ | |
1625 | goto loop2; | |
7146af97 JB |
1626 | } |
1627 | } | |
1628 | break; | |
1629 | ||
a0a38eb7 KH |
1630 | case Lisp_Misc: |
1631 | switch (XMISC (obj)->type) | |
1632 | { | |
1633 | case Lisp_Misc_Marker: | |
1634 | XMARK (XMARKER (obj)->chain); | |
1635 | /* DO NOT mark thru the marker's chain. | |
1636 | The buffer's markers chain does not preserve markers from gc; | |
1637 | instead, markers are removed from the chain when freed by gc. */ | |
1638 | break; | |
1639 | ||
465edf35 KH |
1640 | case Lisp_Misc_Buffer_Local_Value: |
1641 | case Lisp_Misc_Some_Buffer_Local_Value: | |
1642 | { | |
1643 | register struct Lisp_Buffer_Local_Value *ptr | |
1644 | = XBUFFER_LOCAL_VALUE (obj); | |
1645 | if (XMARKBIT (ptr->car)) break; | |
1646 | XMARK (ptr->car); | |
1647 | /* If the cdr is nil, avoid recursion for the car. */ | |
1648 | if (EQ (ptr->cdr, Qnil)) | |
1649 | { | |
1650 | objptr = &ptr->car; | |
1651 | goto loop; | |
1652 | } | |
1653 | mark_object (&ptr->car); | |
1654 | /* See comment above under Lisp_Vector for why not use ptr here. */ | |
1655 | objptr = &XBUFFER_LOCAL_VALUE (obj)->cdr; | |
1656 | goto loop; | |
1657 | } | |
1658 | ||
c8616056 KH |
1659 | case Lisp_Misc_Intfwd: |
1660 | case Lisp_Misc_Boolfwd: | |
1661 | case Lisp_Misc_Objfwd: | |
1662 | case Lisp_Misc_Buffer_Objfwd: | |
1663 | /* Don't bother with Lisp_Buffer_Objfwd, | |
1664 | since all markable slots in current buffer marked anyway. */ | |
1665 | /* Don't need to do Lisp_Objfwd, since the places they point | |
1666 | are protected with staticpro. */ | |
1667 | break; | |
1668 | ||
e202fa34 KH |
1669 | case Lisp_Misc_Overlay: |
1670 | { | |
1671 | struct Lisp_Overlay *ptr = XOVERLAY (obj); | |
1672 | if (!XMARKBIT (ptr->plist)) | |
1673 | { | |
1674 | XMARK (ptr->plist); | |
1675 | mark_object (&ptr->start); | |
1676 | mark_object (&ptr->end); | |
1677 | objptr = &ptr->plist; | |
1678 | goto loop; | |
1679 | } | |
1680 | } | |
1681 | break; | |
1682 | ||
a0a38eb7 KH |
1683 | default: |
1684 | abort (); | |
1685 | } | |
7146af97 JB |
1686 | break; |
1687 | ||
1688 | case Lisp_Cons: | |
7146af97 JB |
1689 | { |
1690 | register struct Lisp_Cons *ptr = XCONS (obj); | |
1691 | if (XMARKBIT (ptr->car)) break; | |
1692 | XMARK (ptr->car); | |
c54ca951 RS |
1693 | /* If the cdr is nil, avoid recursion for the car. */ |
1694 | if (EQ (ptr->cdr, Qnil)) | |
1695 | { | |
1696 | objptr = &ptr->car; | |
c54ca951 RS |
1697 | goto loop; |
1698 | } | |
7146af97 | 1699 | mark_object (&ptr->car); |
41f54422 RS |
1700 | /* See comment above under Lisp_Vector for why not use ptr here. */ |
1701 | objptr = &XCONS (obj)->cdr; | |
7146af97 JB |
1702 | goto loop; |
1703 | } | |
1704 | ||
1705 | #ifdef LISP_FLOAT_TYPE | |
1706 | case Lisp_Float: | |
1707 | XMARK (XFLOAT (obj)->type); | |
1708 | break; | |
1709 | #endif /* LISP_FLOAT_TYPE */ | |
1710 | ||
7146af97 | 1711 | case Lisp_Int: |
7146af97 JB |
1712 | break; |
1713 | ||
1714 | default: | |
1715 | abort (); | |
1716 | } | |
1717 | } | |
1718 | ||
1719 | /* Mark the pointers in a buffer structure. */ | |
1720 | ||
1721 | static void | |
1722 | mark_buffer (buf) | |
1723 | Lisp_Object buf; | |
1724 | { | |
7146af97 JB |
1725 | register struct buffer *buffer = XBUFFER (buf); |
1726 | register Lisp_Object *ptr; | |
30e3190a | 1727 | Lisp_Object base_buffer; |
7146af97 JB |
1728 | |
1729 | /* This is the buffer's markbit */ | |
1730 | mark_object (&buffer->name); | |
1731 | XMARK (buffer->name); | |
1732 | ||
30e3190a | 1733 | MARK_INTERVAL_TREE (BUF_INTERVALS (buffer)); |
d5e35230 | 1734 | |
7146af97 JB |
1735 | #if 0 |
1736 | mark_object (buffer->syntax_table); | |
1737 | ||
1738 | /* Mark the various string-pointers in the buffer object. | |
1739 | Since the strings may be relocated, we must mark them | |
1740 | in their actual slots. So gc_sweep must convert each slot | |
1741 | back to an ordinary C pointer. */ | |
45d12a89 | 1742 | XSETSTRING (*(Lisp_Object *)&buffer->upcase_table, buffer->upcase_table); |
7146af97 | 1743 | mark_object ((Lisp_Object *)&buffer->upcase_table); |
45d12a89 | 1744 | XSETSTRING (*(Lisp_Object *)&buffer->downcase_table, buffer->downcase_table); |
7146af97 JB |
1745 | mark_object ((Lisp_Object *)&buffer->downcase_table); |
1746 | ||
45d12a89 | 1747 | XSETSTRING (*(Lisp_Object *)&buffer->sort_table, buffer->sort_table); |
7146af97 | 1748 | mark_object ((Lisp_Object *)&buffer->sort_table); |
45d12a89 | 1749 | XSETSTRING (*(Lisp_Object *)&buffer->folding_sort_table, buffer->folding_sort_table); |
7146af97 JB |
1750 | mark_object ((Lisp_Object *)&buffer->folding_sort_table); |
1751 | #endif | |
1752 | ||
1753 | for (ptr = &buffer->name + 1; | |
1754 | (char *)ptr < (char *)buffer + sizeof (struct buffer); | |
1755 | ptr++) | |
1756 | mark_object (ptr); | |
30e3190a RS |
1757 | |
1758 | /* If this is an indirect buffer, mark its base buffer. */ | |
6b552283 | 1759 | if (buffer->base_buffer && !XMARKBIT (buffer->base_buffer->name)) |
30e3190a RS |
1760 | { |
1761 | XSETBUFFER (base_buffer, buffer->base_buffer); | |
1762 | mark_buffer (base_buffer); | |
1763 | } | |
7146af97 JB |
1764 | } |
1765 | \f | |
1a4f1e2c | 1766 | /* Sweep: find all structures not marked, and free them. */ |
7146af97 JB |
1767 | |
1768 | static void | |
1769 | gc_sweep () | |
1770 | { | |
1771 | total_string_size = 0; | |
1772 | compact_strings (); | |
1773 | ||
1774 | /* Put all unmarked conses on free list */ | |
1775 | { | |
1776 | register struct cons_block *cblk; | |
1777 | register int lim = cons_block_index; | |
1778 | register int num_free = 0, num_used = 0; | |
1779 | ||
1780 | cons_free_list = 0; | |
1781 | ||
1782 | for (cblk = cons_block; cblk; cblk = cblk->next) | |
1783 | { | |
1784 | register int i; | |
1785 | for (i = 0; i < lim; i++) | |
1786 | if (!XMARKBIT (cblk->conses[i].car)) | |
1787 | { | |
7146af97 | 1788 | num_free++; |
85481507 | 1789 | *(struct Lisp_Cons **)&cblk->conses[i].car = cons_free_list; |
7146af97 JB |
1790 | cons_free_list = &cblk->conses[i]; |
1791 | } | |
1792 | else | |
1793 | { | |
1794 | num_used++; | |
1795 | XUNMARK (cblk->conses[i].car); | |
1796 | } | |
1797 | lim = CONS_BLOCK_SIZE; | |
1798 | } | |
1799 | total_conses = num_used; | |
1800 | total_free_conses = num_free; | |
1801 | } | |
1802 | ||
1803 | #ifdef LISP_FLOAT_TYPE | |
1804 | /* Put all unmarked floats on free list */ | |
1805 | { | |
1806 | register struct float_block *fblk; | |
1807 | register int lim = float_block_index; | |
1808 | register int num_free = 0, num_used = 0; | |
1809 | ||
1810 | float_free_list = 0; | |
1811 | ||
1812 | for (fblk = float_block; fblk; fblk = fblk->next) | |
1813 | { | |
1814 | register int i; | |
1815 | for (i = 0; i < lim; i++) | |
1816 | if (!XMARKBIT (fblk->floats[i].type)) | |
1817 | { | |
7146af97 | 1818 | num_free++; |
85481507 | 1819 | *(struct Lisp_Float **)&fblk->floats[i].type = float_free_list; |
7146af97 JB |
1820 | float_free_list = &fblk->floats[i]; |
1821 | } | |
1822 | else | |
1823 | { | |
1824 | num_used++; | |
1825 | XUNMARK (fblk->floats[i].type); | |
1826 | } | |
1827 | lim = FLOAT_BLOCK_SIZE; | |
1828 | } | |
1829 | total_floats = num_used; | |
1830 | total_free_floats = num_free; | |
1831 | } | |
1832 | #endif /* LISP_FLOAT_TYPE */ | |
1833 | ||
d5e35230 JA |
1834 | #ifdef USE_TEXT_PROPERTIES |
1835 | /* Put all unmarked intervals on free list */ | |
1836 | { | |
1837 | register struct interval_block *iblk; | |
1838 | register int lim = interval_block_index; | |
1839 | register int num_free = 0, num_used = 0; | |
1840 | ||
1841 | interval_free_list = 0; | |
1842 | ||
1843 | for (iblk = interval_block; iblk; iblk = iblk->next) | |
1844 | { | |
1845 | register int i; | |
1846 | ||
1847 | for (i = 0; i < lim; i++) | |
1848 | { | |
1849 | if (! XMARKBIT (iblk->intervals[i].plist)) | |
1850 | { | |
1851 | iblk->intervals[i].parent = interval_free_list; | |
1852 | interval_free_list = &iblk->intervals[i]; | |
1853 | num_free++; | |
1854 | } | |
1855 | else | |
1856 | { | |
1857 | num_used++; | |
1858 | XUNMARK (iblk->intervals[i].plist); | |
1859 | } | |
1860 | } | |
1861 | lim = INTERVAL_BLOCK_SIZE; | |
1862 | } | |
1863 | total_intervals = num_used; | |
1864 | total_free_intervals = num_free; | |
1865 | } | |
1866 | #endif /* USE_TEXT_PROPERTIES */ | |
1867 | ||
7146af97 JB |
1868 | /* Put all unmarked symbols on free list */ |
1869 | { | |
1870 | register struct symbol_block *sblk; | |
1871 | register int lim = symbol_block_index; | |
1872 | register int num_free = 0, num_used = 0; | |
1873 | ||
1874 | symbol_free_list = 0; | |
1875 | ||
1876 | for (sblk = symbol_block; sblk; sblk = sblk->next) | |
1877 | { | |
1878 | register int i; | |
1879 | for (i = 0; i < lim; i++) | |
1880 | if (!XMARKBIT (sblk->symbols[i].plist)) | |
1881 | { | |
85481507 | 1882 | *(struct Lisp_Symbol **)&sblk->symbols[i].value = symbol_free_list; |
7146af97 JB |
1883 | symbol_free_list = &sblk->symbols[i]; |
1884 | num_free++; | |
1885 | } | |
1886 | else | |
1887 | { | |
1888 | num_used++; | |
1889 | sblk->symbols[i].name | |
1890 | = XSTRING (*(Lisp_Object *) &sblk->symbols[i].name); | |
1891 | XUNMARK (sblk->symbols[i].plist); | |
1892 | } | |
1893 | lim = SYMBOL_BLOCK_SIZE; | |
1894 | } | |
1895 | total_symbols = num_used; | |
1896 | total_free_symbols = num_free; | |
1897 | } | |
1898 | ||
1899 | #ifndef standalone | |
1900 | /* Put all unmarked markers on free list. | |
465edf35 KH |
1901 | Dechain each one first from the buffer it points into, |
1902 | but only if it's a real marker. */ | |
7146af97 JB |
1903 | { |
1904 | register struct marker_block *mblk; | |
7146af97 JB |
1905 | register int lim = marker_block_index; |
1906 | register int num_free = 0, num_used = 0; | |
1907 | ||
1908 | marker_free_list = 0; | |
1909 | ||
1910 | for (mblk = marker_block; mblk; mblk = mblk->next) | |
1911 | { | |
1912 | register int i; | |
1913 | for (i = 0; i < lim; i++) | |
465edf35 KH |
1914 | { |
1915 | Lisp_Object *markword; | |
1916 | switch (mblk->markers[i].type) | |
1917 | { | |
1918 | case Lisp_Misc_Marker: | |
1919 | markword = &mblk->markers[i].u_marker.chain; | |
1920 | break; | |
1921 | case Lisp_Misc_Buffer_Local_Value: | |
1922 | case Lisp_Misc_Some_Buffer_Local_Value: | |
1923 | markword = &mblk->markers[i].u_buffer_local_value.car; | |
1924 | break; | |
e202fa34 KH |
1925 | case Lisp_Misc_Overlay: |
1926 | markword = &mblk->markers[i].u_overlay.plist; | |
1927 | break; | |
465edf35 KH |
1928 | default: |
1929 | markword = 0; | |
e202fa34 | 1930 | break; |
465edf35 KH |
1931 | } |
1932 | if (markword && !XMARKBIT (*markword)) | |
1933 | { | |
1934 | Lisp_Object tem; | |
1935 | if (mblk->markers[i].type == Lisp_Misc_Marker) | |
1936 | { | |
1937 | /* tem1 avoids Sun compiler bug */ | |
1938 | struct Lisp_Marker *tem1 = &mblk->markers[i].u_marker; | |
1939 | XSETMARKER (tem, tem1); | |
1940 | unchain_marker (tem); | |
1941 | } | |
1942 | /* We could leave the type alone, since nobody checks it, | |
1943 | but this might catch bugs faster. */ | |
1944 | mblk->markers[i].type = Lisp_Misc_Free; | |
1945 | mblk->markers[i].u_free.chain = marker_free_list; | |
1946 | marker_free_list = &mblk->markers[i]; | |
1947 | num_free++; | |
1948 | } | |
1949 | else | |
1950 | { | |
1951 | num_used++; | |
1952 | if (markword) | |
1953 | XUNMARK (*markword); | |
1954 | } | |
1955 | } | |
7146af97 JB |
1956 | lim = MARKER_BLOCK_SIZE; |
1957 | } | |
1958 | ||
1959 | total_markers = num_used; | |
1960 | total_free_markers = num_free; | |
1961 | } | |
1962 | ||
1963 | /* Free all unmarked buffers */ | |
1964 | { | |
1965 | register struct buffer *buffer = all_buffers, *prev = 0, *next; | |
1966 | ||
1967 | while (buffer) | |
1968 | if (!XMARKBIT (buffer->name)) | |
1969 | { | |
1970 | if (prev) | |
1971 | prev->next = buffer->next; | |
1972 | else | |
1973 | all_buffers = buffer->next; | |
1974 | next = buffer->next; | |
9ac0d9e0 | 1975 | xfree (buffer); |
7146af97 JB |
1976 | buffer = next; |
1977 | } | |
1978 | else | |
1979 | { | |
1980 | XUNMARK (buffer->name); | |
30e3190a | 1981 | UNMARK_BALANCE_INTERVALS (BUF_INTERVALS (buffer)); |
7146af97 JB |
1982 | |
1983 | #if 0 | |
1984 | /* Each `struct Lisp_String *' was turned into a Lisp_Object | |
1985 | for purposes of marking and relocation. | |
1986 | Turn them back into C pointers now. */ | |
1987 | buffer->upcase_table | |
1988 | = XSTRING (*(Lisp_Object *)&buffer->upcase_table); | |
1989 | buffer->downcase_table | |
1990 | = XSTRING (*(Lisp_Object *)&buffer->downcase_table); | |
1991 | buffer->sort_table | |
1992 | = XSTRING (*(Lisp_Object *)&buffer->sort_table); | |
1993 | buffer->folding_sort_table | |
1994 | = XSTRING (*(Lisp_Object *)&buffer->folding_sort_table); | |
1995 | #endif | |
1996 | ||
1997 | prev = buffer, buffer = buffer->next; | |
1998 | } | |
1999 | } | |
2000 | ||
2001 | #endif /* standalone */ | |
2002 | ||
2003 | /* Free all unmarked vectors */ | |
2004 | { | |
2005 | register struct Lisp_Vector *vector = all_vectors, *prev = 0, *next; | |
2006 | total_vector_size = 0; | |
2007 | ||
2008 | while (vector) | |
2009 | if (!(vector->size & ARRAY_MARK_FLAG)) | |
2010 | { | |
2011 | if (prev) | |
2012 | prev->next = vector->next; | |
2013 | else | |
2014 | all_vectors = vector->next; | |
2015 | next = vector->next; | |
9ac0d9e0 | 2016 | xfree (vector); |
7146af97 JB |
2017 | vector = next; |
2018 | } | |
2019 | else | |
2020 | { | |
2021 | vector->size &= ~ARRAY_MARK_FLAG; | |
2022 | total_vector_size += vector->size; | |
2023 | prev = vector, vector = vector->next; | |
2024 | } | |
2025 | } | |
2026 | ||
2027 | /* Free all "large strings" not marked with ARRAY_MARK_FLAG. */ | |
2028 | { | |
2029 | register struct string_block *sb = large_string_blocks, *prev = 0, *next; | |
e8720644 | 2030 | struct Lisp_String *s; |
7146af97 JB |
2031 | |
2032 | while (sb) | |
e8720644 JB |
2033 | { |
2034 | s = (struct Lisp_String *) &sb->chars[0]; | |
2035 | if (s->size & ARRAY_MARK_FLAG) | |
2036 | { | |
2037 | ((struct Lisp_String *)(&sb->chars[0]))->size | |
2038 | &= ~ARRAY_MARK_FLAG & ~MARKBIT; | |
2039 | UNMARK_BALANCE_INTERVALS (s->intervals); | |
2040 | total_string_size += ((struct Lisp_String *)(&sb->chars[0]))->size; | |
2041 | prev = sb, sb = sb->next; | |
2042 | } | |
2043 | else | |
2044 | { | |
2045 | if (prev) | |
2046 | prev->next = sb->next; | |
2047 | else | |
2048 | large_string_blocks = sb->next; | |
2049 | next = sb->next; | |
2050 | xfree (sb); | |
2051 | sb = next; | |
2052 | } | |
2053 | } | |
7146af97 JB |
2054 | } |
2055 | } | |
2056 | \f | |
1a4f1e2c | 2057 | /* Compactify strings, relocate references, and free empty string blocks. */ |
7146af97 JB |
2058 | |
2059 | static void | |
2060 | compact_strings () | |
2061 | { | |
2062 | /* String block of old strings we are scanning. */ | |
2063 | register struct string_block *from_sb; | |
2064 | /* A preceding string block (or maybe the same one) | |
2065 | where we are copying the still-live strings to. */ | |
2066 | register struct string_block *to_sb; | |
2067 | int pos; | |
2068 | int to_pos; | |
2069 | ||
2070 | to_sb = first_string_block; | |
2071 | to_pos = 0; | |
2072 | ||
2073 | /* Scan each existing string block sequentially, string by string. */ | |
2074 | for (from_sb = first_string_block; from_sb; from_sb = from_sb->next) | |
2075 | { | |
2076 | pos = 0; | |
2077 | /* POS is the index of the next string in the block. */ | |
2078 | while (pos < from_sb->pos) | |
2079 | { | |
2080 | register struct Lisp_String *nextstr | |
2081 | = (struct Lisp_String *) &from_sb->chars[pos]; | |
2082 | ||
2083 | register struct Lisp_String *newaddr; | |
42607681 | 2084 | register EMACS_INT size = nextstr->size; |
7146af97 JB |
2085 | |
2086 | /* NEXTSTR is the old address of the next string. | |
2087 | Just skip it if it isn't marked. */ | |
42607681 | 2088 | if ((EMACS_UINT) size > STRING_BLOCK_SIZE) |
7146af97 JB |
2089 | { |
2090 | /* It is marked, so its size field is really a chain of refs. | |
2091 | Find the end of the chain, where the actual size lives. */ | |
42607681 | 2092 | while ((EMACS_UINT) size > STRING_BLOCK_SIZE) |
7146af97 JB |
2093 | { |
2094 | if (size & 1) size ^= MARKBIT | 1; | |
42607681 | 2095 | size = *(EMACS_INT *)size & ~MARKBIT; |
7146af97 JB |
2096 | } |
2097 | ||
2098 | total_string_size += size; | |
2099 | ||
2100 | /* If it won't fit in TO_SB, close it out, | |
2101 | and move to the next sb. Keep doing so until | |
2102 | TO_SB reaches a large enough, empty enough string block. | |
2103 | We know that TO_SB cannot advance past FROM_SB here | |
2104 | since FROM_SB is large enough to contain this string. | |
2105 | Any string blocks skipped here | |
2106 | will be patched out and freed later. */ | |
2107 | while (to_pos + STRING_FULLSIZE (size) | |
2108 | > max (to_sb->pos, STRING_BLOCK_SIZE)) | |
2109 | { | |
2110 | to_sb->pos = to_pos; | |
2111 | to_sb = to_sb->next; | |
2112 | to_pos = 0; | |
2113 | } | |
2114 | /* Compute new address of this string | |
2115 | and update TO_POS for the space being used. */ | |
2116 | newaddr = (struct Lisp_String *) &to_sb->chars[to_pos]; | |
2117 | to_pos += STRING_FULLSIZE (size); | |
2118 | ||
2119 | /* Copy the string itself to the new place. */ | |
2120 | if (nextstr != newaddr) | |
42607681 | 2121 | bcopy (nextstr, newaddr, size + 1 + sizeof (EMACS_INT) |
d5e35230 | 2122 | + INTERVAL_PTR_SIZE); |
7146af97 JB |
2123 | |
2124 | /* Go through NEXTSTR's chain of references | |
2125 | and make each slot in the chain point to | |
2126 | the new address of this string. */ | |
2127 | size = newaddr->size; | |
42607681 | 2128 | while ((EMACS_UINT) size > STRING_BLOCK_SIZE) |
7146af97 JB |
2129 | { |
2130 | register Lisp_Object *objptr; | |
2131 | if (size & 1) size ^= MARKBIT | 1; | |
2132 | objptr = (Lisp_Object *)size; | |
2133 | ||
2134 | size = XFASTINT (*objptr) & ~MARKBIT; | |
2135 | if (XMARKBIT (*objptr)) | |
2136 | { | |
45d12a89 | 2137 | XSETSTRING (*objptr, newaddr); |
7146af97 JB |
2138 | XMARK (*objptr); |
2139 | } | |
2140 | else | |
45d12a89 | 2141 | XSETSTRING (*objptr, newaddr); |
7146af97 JB |
2142 | } |
2143 | /* Store the actual size in the size field. */ | |
2144 | newaddr->size = size; | |
e8720644 | 2145 | |
5f60ed47 | 2146 | #ifdef USE_TEXT_PROPERTIES |
e8720644 JB |
2147 | /* Now that the string has been relocated, rebalance its |
2148 | interval tree, and update the tree's parent pointer. */ | |
2149 | if (! NULL_INTERVAL_P (newaddr->intervals)) | |
2150 | { | |
2151 | UNMARK_BALANCE_INTERVALS (newaddr->intervals); | |
45d12a89 KH |
2152 | XSETSTRING (* (Lisp_Object *) &newaddr->intervals->parent, |
2153 | newaddr); | |
e8720644 | 2154 | } |
5f60ed47 | 2155 | #endif /* USE_TEXT_PROPERTIES */ |
7146af97 JB |
2156 | } |
2157 | pos += STRING_FULLSIZE (size); | |
2158 | } | |
2159 | } | |
2160 | ||
2161 | /* Close out the last string block still used and free any that follow. */ | |
2162 | to_sb->pos = to_pos; | |
2163 | current_string_block = to_sb; | |
2164 | ||
2165 | from_sb = to_sb->next; | |
2166 | to_sb->next = 0; | |
2167 | while (from_sb) | |
2168 | { | |
2169 | to_sb = from_sb->next; | |
9ac0d9e0 | 2170 | xfree (from_sb); |
7146af97 JB |
2171 | from_sb = to_sb; |
2172 | } | |
2173 | ||
2174 | /* Free any empty string blocks further back in the chain. | |
2175 | This loop will never free first_string_block, but it is very | |
2176 | unlikely that that one will become empty, so why bother checking? */ | |
2177 | ||
2178 | from_sb = first_string_block; | |
2179 | while (to_sb = from_sb->next) | |
2180 | { | |
2181 | if (to_sb->pos == 0) | |
2182 | { | |
2183 | if (from_sb->next = to_sb->next) | |
2184 | from_sb->next->prev = from_sb; | |
9ac0d9e0 | 2185 | xfree (to_sb); |
7146af97 JB |
2186 | } |
2187 | else | |
2188 | from_sb = to_sb; | |
2189 | } | |
2190 | } | |
2191 | \f | |
20d24714 JB |
2192 | /* Debugging aids. */ |
2193 | ||
31ce1c91 | 2194 | DEFUN ("memory-limit", Fmemory_limit, Smemory_limit, 0, 0, 0, |
20d24714 JB |
2195 | "Return the address of the last byte Emacs has allocated, divided by 1024.\n\ |
2196 | This may be helpful in debugging Emacs's memory usage.\n\ | |
e41ae81f | 2197 | We divide the value by 1024 to make sure it fits in a Lisp integer.") |
20d24714 JB |
2198 | () |
2199 | { | |
2200 | Lisp_Object end; | |
2201 | ||
45d12a89 | 2202 | XSETINT (end, (EMACS_INT) sbrk (0) / 1024); |
20d24714 JB |
2203 | |
2204 | return end; | |
2205 | } | |
2206 | ||
2207 | \f | |
7146af97 JB |
2208 | /* Initialization */ |
2209 | ||
2210 | init_alloc_once () | |
2211 | { | |
2212 | /* Used to do Vpurify_flag = Qt here, but Qt isn't set up yet! */ | |
2213 | pureptr = 0; | |
4c0be5f4 JB |
2214 | #ifdef HAVE_SHM |
2215 | pure_size = PURESIZE; | |
2216 | #endif | |
7146af97 JB |
2217 | all_vectors = 0; |
2218 | ignore_warnings = 1; | |
2219 | init_strings (); | |
2220 | init_cons (); | |
2221 | init_symbol (); | |
2222 | init_marker (); | |
2223 | #ifdef LISP_FLOAT_TYPE | |
2224 | init_float (); | |
2225 | #endif /* LISP_FLOAT_TYPE */ | |
d5e35230 JA |
2226 | INIT_INTERVALS; |
2227 | ||
7146af97 JB |
2228 | ignore_warnings = 0; |
2229 | gcprolist = 0; | |
2230 | staticidx = 0; | |
2231 | consing_since_gc = 0; | |
2232 | gc_cons_threshold = 100000; | |
2233 | #ifdef VIRT_ADDR_VARIES | |
2234 | malloc_sbrk_unused = 1<<22; /* A large number */ | |
2235 | malloc_sbrk_used = 100000; /* as reasonable as any number */ | |
2236 | #endif /* VIRT_ADDR_VARIES */ | |
2237 | } | |
2238 | ||
2239 | init_alloc () | |
2240 | { | |
2241 | gcprolist = 0; | |
2242 | } | |
2243 | ||
2244 | void | |
2245 | syms_of_alloc () | |
2246 | { | |
2247 | DEFVAR_INT ("gc-cons-threshold", &gc_cons_threshold, | |
2248 | "*Number of bytes of consing between garbage collections.\n\ | |
2249 | Garbage collection can happen automatically once this many bytes have been\n\ | |
2250 | allocated since the last garbage collection. All data types count.\n\n\ | |
2251 | Garbage collection happens automatically only when `eval' is called.\n\n\ | |
2252 | By binding this temporarily to a large number, you can effectively\n\ | |
2253 | prevent garbage collection during a part of the program."); | |
2254 | ||
2255 | DEFVAR_INT ("pure-bytes-used", &pureptr, | |
2256 | "Number of bytes of sharable Lisp data allocated so far."); | |
2257 | ||
2258 | #if 0 | |
2259 | DEFVAR_INT ("data-bytes-used", &malloc_sbrk_used, | |
2260 | "Number of bytes of unshared memory allocated in this session."); | |
2261 | ||
2262 | DEFVAR_INT ("data-bytes-free", &malloc_sbrk_unused, | |
2263 | "Number of bytes of unshared memory remaining available in this session."); | |
2264 | #endif | |
2265 | ||
2266 | DEFVAR_LISP ("purify-flag", &Vpurify_flag, | |
2267 | "Non-nil means loading Lisp code in order to dump an executable.\n\ | |
2268 | This means that certain objects should be allocated in shared (pure) space."); | |
2269 | ||
502b9b64 | 2270 | DEFVAR_INT ("undo-limit", &undo_limit, |
7146af97 | 2271 | "Keep no more undo information once it exceeds this size.\n\ |
502b9b64 | 2272 | This limit is applied when garbage collection happens.\n\ |
7146af97 JB |
2273 | The size is counted as the number of bytes occupied,\n\ |
2274 | which includes both saved text and other data."); | |
502b9b64 | 2275 | undo_limit = 20000; |
7146af97 | 2276 | |
502b9b64 | 2277 | DEFVAR_INT ("undo-strong-limit", &undo_strong_limit, |
7146af97 JB |
2278 | "Don't keep more than this much size of undo information.\n\ |
2279 | A command which pushes past this size is itself forgotten.\n\ | |
502b9b64 | 2280 | This limit is applied when garbage collection happens.\n\ |
7146af97 JB |
2281 | The size is counted as the number of bytes occupied,\n\ |
2282 | which includes both saved text and other data."); | |
502b9b64 | 2283 | undo_strong_limit = 30000; |
7146af97 | 2284 | |
bcb61d60 KH |
2285 | /* We build this in advance because if we wait until we need it, we might |
2286 | not be able to allocate the memory to hold it. */ | |
cf3540e4 RS |
2287 | memory_signal_data |
2288 | = Fcons (Qerror, Fcons (build_string ("Memory exhausted"), Qnil)); | |
bcb61d60 KH |
2289 | staticpro (&memory_signal_data); |
2290 | ||
7146af97 JB |
2291 | defsubr (&Scons); |
2292 | defsubr (&Slist); | |
2293 | defsubr (&Svector); | |
2294 | defsubr (&Smake_byte_code); | |
2295 | defsubr (&Smake_list); | |
2296 | defsubr (&Smake_vector); | |
2297 | defsubr (&Smake_string); | |
7146af97 JB |
2298 | defsubr (&Smake_symbol); |
2299 | defsubr (&Smake_marker); | |
2300 | defsubr (&Spurecopy); | |
2301 | defsubr (&Sgarbage_collect); | |
20d24714 | 2302 | defsubr (&Smemory_limit); |
7146af97 | 2303 | } |