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7146af97 | 1 | /* Storage allocation and gc for GNU Emacs Lisp interpreter. |
7c299e7a | 2 | Copyright (C) 1985, 1986, 1988, 1992, 1993 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 | ||
20 | ||
21 | #include "config.h" | |
22 | #include "lisp.h" | |
d5e35230 | 23 | #include "intervals.h" |
4c0be5f4 | 24 | #include "puresize.h" |
7146af97 JB |
25 | #ifndef standalone |
26 | #include "buffer.h" | |
27 | #include "window.h" | |
502b9b64 | 28 | #include "frame.h" |
7146af97 JB |
29 | #endif |
30 | ||
e065a56e JB |
31 | #include "syssignal.h" |
32 | ||
7146af97 JB |
33 | #define max(A,B) ((A) > (B) ? (A) : (B)) |
34 | ||
35 | /* Macro to verify that storage intended for Lisp objects is not | |
36 | out of range to fit in the space for a pointer. | |
37 | ADDRESS is the start of the block, and SIZE | |
38 | is the amount of space within which objects can start. */ | |
39 | #define VALIDATE_LISP_STORAGE(address, size) \ | |
40 | do \ | |
41 | { \ | |
42 | Lisp_Object val; \ | |
43 | XSET (val, Lisp_Cons, (char *) address + size); \ | |
44 | if ((char *) XCONS (val) != (char *) address + size) \ | |
45 | { \ | |
46 | free (address); \ | |
47 | memory_full (); \ | |
48 | } \ | |
49 | } while (0) | |
50 | ||
51 | /* Number of bytes of consing done since the last gc */ | |
52 | int consing_since_gc; | |
53 | ||
54 | /* Number of bytes of consing since gc before another gc should be done. */ | |
55 | int gc_cons_threshold; | |
56 | ||
57 | /* Nonzero during gc */ | |
58 | int gc_in_progress; | |
59 | ||
60 | #ifndef VIRT_ADDR_VARIES | |
61 | extern | |
62 | #endif /* VIRT_ADDR_VARIES */ | |
63 | int malloc_sbrk_used; | |
64 | ||
65 | #ifndef VIRT_ADDR_VARIES | |
66 | extern | |
67 | #endif /* VIRT_ADDR_VARIES */ | |
68 | int malloc_sbrk_unused; | |
69 | ||
502b9b64 JB |
70 | /* Two limits controlling how much undo information to keep. */ |
71 | int undo_limit; | |
72 | int undo_strong_limit; | |
7146af97 JB |
73 | |
74 | /* Non-nil means defun should do purecopy on the function definition */ | |
75 | Lisp_Object Vpurify_flag; | |
76 | ||
77 | #ifndef HAVE_SHM | |
78 | int pure[PURESIZE / sizeof (int)] = {0,}; /* Force it into data space! */ | |
79 | #define PUREBEG (char *) pure | |
80 | #else | |
81 | #define pure PURE_SEG_BITS /* Use shared memory segment */ | |
82 | #define PUREBEG (char *)PURE_SEG_BITS | |
4c0be5f4 JB |
83 | |
84 | /* This variable is used only by the XPNTR macro when HAVE_SHM is | |
85 | defined. If we used the PURESIZE macro directly there, that would | |
86 | make most of emacs dependent on puresize.h, which we don't want - | |
87 | you should be able to change that without too much recompilation. | |
88 | So map_in_data initializes pure_size, and the dependencies work | |
89 | out. */ | |
90 | int pure_size; | |
7146af97 JB |
91 | #endif /* not HAVE_SHM */ |
92 | ||
93 | /* Index in pure at which next pure object will be allocated. */ | |
94 | int pureptr; | |
95 | ||
96 | /* If nonzero, this is a warning delivered by malloc and not yet displayed. */ | |
97 | char *pending_malloc_warning; | |
98 | ||
99 | /* Maximum amount of C stack to save when a GC happens. */ | |
100 | ||
101 | #ifndef MAX_SAVE_STACK | |
102 | #define MAX_SAVE_STACK 16000 | |
103 | #endif | |
104 | ||
105 | /* Buffer in which we save a copy of the C stack at each GC. */ | |
106 | ||
107 | char *stack_copy; | |
108 | int stack_copy_size; | |
109 | ||
110 | /* Non-zero means ignore malloc warnings. Set during initialization. */ | |
111 | int ignore_warnings; | |
350273a4 JA |
112 | |
113 | static void mark_object (), mark_buffer (); | |
114 | static void clear_marks (), gc_sweep (); | |
115 | static void compact_strings (); | |
7146af97 | 116 | \f |
1a4f1e2c JB |
117 | /* Versions of malloc and realloc that print warnings as memory gets full. */ |
118 | ||
7146af97 JB |
119 | Lisp_Object |
120 | malloc_warning_1 (str) | |
121 | Lisp_Object str; | |
122 | { | |
123 | Fprinc (str, Vstandard_output); | |
124 | write_string ("\nKilling some buffers may delay running out of memory.\n", -1); | |
125 | write_string ("However, certainly by the time you receive the 95% warning,\n", -1); | |
126 | write_string ("you should clean up, kill this Emacs, and start a new one.", -1); | |
127 | return Qnil; | |
128 | } | |
129 | ||
130 | /* malloc calls this if it finds we are near exhausting storage */ | |
131 | malloc_warning (str) | |
132 | char *str; | |
133 | { | |
134 | pending_malloc_warning = str; | |
135 | } | |
136 | ||
137 | display_malloc_warning () | |
138 | { | |
139 | register Lisp_Object val; | |
140 | ||
141 | val = build_string (pending_malloc_warning); | |
142 | pending_malloc_warning = 0; | |
143 | internal_with_output_to_temp_buffer (" *Danger*", malloc_warning_1, val); | |
144 | } | |
145 | ||
146 | /* Called if malloc returns zero */ | |
147 | memory_full () | |
148 | { | |
149 | error ("Memory exhausted"); | |
150 | } | |
151 | ||
152 | /* like malloc and realloc but check for no memory left */ | |
153 | ||
154 | long * | |
155 | xmalloc (size) | |
156 | int size; | |
157 | { | |
158 | register long *val; | |
159 | ||
160 | val = (long *) malloc (size); | |
161 | ||
162 | if (!val && size) memory_full (); | |
163 | return val; | |
164 | } | |
165 | ||
166 | long * | |
167 | xrealloc (block, size) | |
168 | long *block; | |
169 | int size; | |
170 | { | |
171 | register long *val; | |
172 | ||
56d2031b JB |
173 | /* We must call malloc explicitly when BLOCK is 0, since some |
174 | reallocs don't do this. */ | |
175 | if (! block) | |
176 | val = (long *) malloc (size); | |
f048679d | 177 | else |
56d2031b | 178 | val = (long *) realloc (block, size); |
7146af97 JB |
179 | |
180 | if (!val && size) memory_full (); | |
181 | return val; | |
182 | } | |
183 | \f | |
1a4f1e2c JB |
184 | /* Interval allocation. */ |
185 | ||
d5e35230 JA |
186 | #ifdef USE_TEXT_PROPERTIES |
187 | #define INTERVAL_BLOCK_SIZE \ | |
188 | ((1020 - sizeof (struct interval_block *)) / sizeof (struct interval)) | |
189 | ||
190 | struct interval_block | |
191 | { | |
192 | struct interval_block *next; | |
193 | struct interval intervals[INTERVAL_BLOCK_SIZE]; | |
194 | }; | |
195 | ||
196 | struct interval_block *interval_block; | |
197 | static int interval_block_index; | |
198 | ||
199 | INTERVAL interval_free_list; | |
200 | ||
201 | static void | |
202 | init_intervals () | |
203 | { | |
204 | interval_block | |
205 | = (struct interval_block *) malloc (sizeof (struct interval_block)); | |
206 | interval_block->next = 0; | |
207 | bzero (interval_block->intervals, sizeof interval_block->intervals); | |
208 | interval_block_index = 0; | |
209 | interval_free_list = 0; | |
210 | } | |
211 | ||
212 | #define INIT_INTERVALS init_intervals () | |
213 | ||
214 | INTERVAL | |
215 | make_interval () | |
216 | { | |
217 | INTERVAL val; | |
218 | ||
219 | if (interval_free_list) | |
220 | { | |
221 | val = interval_free_list; | |
222 | interval_free_list = interval_free_list->parent; | |
223 | } | |
224 | else | |
225 | { | |
226 | if (interval_block_index == INTERVAL_BLOCK_SIZE) | |
227 | { | |
228 | register struct interval_block *newi | |
229 | = (struct interval_block *) malloc (sizeof (struct interval_block)); | |
230 | ||
231 | if (!newi) | |
232 | memory_full (); | |
233 | ||
234 | VALIDATE_LISP_STORAGE (newi, sizeof *newi); | |
235 | newi->next = interval_block; | |
236 | interval_block = newi; | |
237 | interval_block_index = 0; | |
238 | } | |
239 | val = &interval_block->intervals[interval_block_index++]; | |
240 | } | |
241 | consing_since_gc += sizeof (struct interval); | |
242 | RESET_INTERVAL (val); | |
243 | return val; | |
244 | } | |
245 | ||
246 | static int total_free_intervals, total_intervals; | |
247 | ||
248 | /* Mark the pointers of one interval. */ | |
249 | ||
250 | static void | |
251 | mark_interval (i) | |
252 | register INTERVAL i; | |
253 | { | |
254 | if (XMARKBIT (i->plist)) | |
255 | abort (); | |
256 | mark_object (&i->plist); | |
257 | XMARK (i->plist); | |
258 | } | |
259 | ||
260 | static void | |
261 | mark_interval_tree (tree) | |
262 | register INTERVAL tree; | |
263 | { | |
264 | if (XMARKBIT (tree->plist)) | |
265 | return; | |
266 | ||
1a4f1e2c | 267 | traverse_intervals (tree, 1, 0, mark_interval); |
d5e35230 JA |
268 | } |
269 | ||
270 | #define MARK_INTERVAL_TREE(i) \ | |
271 | { if (!NULL_INTERVAL_P (i)) mark_interval_tree (i); } | |
272 | ||
1a4f1e2c JB |
273 | /* The oddity in the call to XUNMARK is necessary because XUNMARK |
274 | expands to an assigment to its argument, and most C compilers don't | |
275 | support casts on the left operand of `='. */ | |
276 | #define UNMARK_BALANCE_INTERVALS(i) \ | |
277 | { \ | |
278 | if (! NULL_INTERVAL_P (i)) \ | |
279 | { \ | |
280 | XUNMARK (* (Lisp_Object *) (&(i)->parent)); \ | |
281 | (i) = balance_intervals (i); \ | |
282 | } \ | |
d5e35230 JA |
283 | } |
284 | ||
285 | #else /* no interval use */ | |
286 | ||
287 | #define INIT_INTERVALS | |
288 | ||
289 | #define UNMARK_BALANCE_INTERVALS(i) | |
290 | #define MARK_INTERVAL_TREE(i) | |
291 | ||
292 | #endif /* no interval use */ | |
293 | \f | |
1a4f1e2c JB |
294 | /* Floating point allocation. */ |
295 | ||
7146af97 JB |
296 | #ifdef LISP_FLOAT_TYPE |
297 | /* Allocation of float cells, just like conses */ | |
298 | /* We store float cells inside of float_blocks, allocating a new | |
299 | float_block with malloc whenever necessary. Float cells reclaimed by | |
300 | GC are put on a free list to be reallocated before allocating | |
301 | any new float cells from the latest float_block. | |
302 | ||
303 | Each float_block is just under 1020 bytes long, | |
304 | since malloc really allocates in units of powers of two | |
305 | and uses 4 bytes for its own overhead. */ | |
306 | ||
307 | #define FLOAT_BLOCK_SIZE \ | |
308 | ((1020 - sizeof (struct float_block *)) / sizeof (struct Lisp_Float)) | |
309 | ||
310 | struct float_block | |
311 | { | |
312 | struct float_block *next; | |
313 | struct Lisp_Float floats[FLOAT_BLOCK_SIZE]; | |
314 | }; | |
315 | ||
316 | struct float_block *float_block; | |
317 | int float_block_index; | |
318 | ||
319 | struct Lisp_Float *float_free_list; | |
320 | ||
321 | void | |
322 | init_float () | |
323 | { | |
324 | float_block = (struct float_block *) malloc (sizeof (struct float_block)); | |
325 | float_block->next = 0; | |
326 | bzero (float_block->floats, sizeof float_block->floats); | |
327 | float_block_index = 0; | |
328 | float_free_list = 0; | |
329 | } | |
330 | ||
331 | /* Explicitly free a float cell. */ | |
332 | free_float (ptr) | |
333 | struct Lisp_Float *ptr; | |
334 | { | |
335 | XFASTINT (ptr->type) = (int) float_free_list; | |
336 | float_free_list = ptr; | |
337 | } | |
338 | ||
339 | Lisp_Object | |
340 | make_float (float_value) | |
341 | double float_value; | |
342 | { | |
343 | register Lisp_Object val; | |
344 | ||
345 | if (float_free_list) | |
346 | { | |
347 | XSET (val, Lisp_Float, float_free_list); | |
348 | float_free_list = (struct Lisp_Float *) XFASTINT (float_free_list->type); | |
349 | } | |
350 | else | |
351 | { | |
352 | if (float_block_index == FLOAT_BLOCK_SIZE) | |
353 | { | |
354 | register struct float_block *new = (struct float_block *) malloc (sizeof (struct float_block)); | |
355 | if (!new) memory_full (); | |
356 | VALIDATE_LISP_STORAGE (new, sizeof *new); | |
357 | new->next = float_block; | |
358 | float_block = new; | |
359 | float_block_index = 0; | |
360 | } | |
361 | XSET (val, Lisp_Float, &float_block->floats[float_block_index++]); | |
362 | } | |
363 | XFLOAT (val)->data = float_value; | |
364 | XFLOAT (val)->type = 0; /* bug chasing -wsr */ | |
365 | consing_since_gc += sizeof (struct Lisp_Float); | |
366 | return val; | |
367 | } | |
368 | ||
369 | #endif /* LISP_FLOAT_TYPE */ | |
370 | \f | |
371 | /* Allocation of cons cells */ | |
372 | /* We store cons cells inside of cons_blocks, allocating a new | |
373 | cons_block with malloc whenever necessary. Cons cells reclaimed by | |
374 | GC are put on a free list to be reallocated before allocating | |
375 | any new cons cells from the latest cons_block. | |
376 | ||
377 | Each cons_block is just under 1020 bytes long, | |
378 | since malloc really allocates in units of powers of two | |
379 | and uses 4 bytes for its own overhead. */ | |
380 | ||
381 | #define CONS_BLOCK_SIZE \ | |
382 | ((1020 - sizeof (struct cons_block *)) / sizeof (struct Lisp_Cons)) | |
383 | ||
384 | struct cons_block | |
385 | { | |
386 | struct cons_block *next; | |
387 | struct Lisp_Cons conses[CONS_BLOCK_SIZE]; | |
388 | }; | |
389 | ||
390 | struct cons_block *cons_block; | |
391 | int cons_block_index; | |
392 | ||
393 | struct Lisp_Cons *cons_free_list; | |
394 | ||
395 | void | |
396 | init_cons () | |
397 | { | |
398 | cons_block = (struct cons_block *) malloc (sizeof (struct cons_block)); | |
399 | cons_block->next = 0; | |
400 | bzero (cons_block->conses, sizeof cons_block->conses); | |
401 | cons_block_index = 0; | |
402 | cons_free_list = 0; | |
403 | } | |
404 | ||
405 | /* Explicitly free a cons cell. */ | |
406 | free_cons (ptr) | |
407 | struct Lisp_Cons *ptr; | |
408 | { | |
409 | XFASTINT (ptr->car) = (int) cons_free_list; | |
410 | cons_free_list = ptr; | |
411 | } | |
412 | ||
413 | DEFUN ("cons", Fcons, Scons, 2, 2, 0, | |
414 | "Create a new cons, give it CAR and CDR as components, and return it.") | |
415 | (car, cdr) | |
416 | Lisp_Object car, cdr; | |
417 | { | |
418 | register Lisp_Object val; | |
419 | ||
420 | if (cons_free_list) | |
421 | { | |
422 | XSET (val, Lisp_Cons, cons_free_list); | |
423 | cons_free_list = (struct Lisp_Cons *) XFASTINT (cons_free_list->car); | |
424 | } | |
425 | else | |
426 | { | |
427 | if (cons_block_index == CONS_BLOCK_SIZE) | |
428 | { | |
429 | register struct cons_block *new = (struct cons_block *) malloc (sizeof (struct cons_block)); | |
430 | if (!new) memory_full (); | |
431 | VALIDATE_LISP_STORAGE (new, sizeof *new); | |
432 | new->next = cons_block; | |
433 | cons_block = new; | |
434 | cons_block_index = 0; | |
435 | } | |
436 | XSET (val, Lisp_Cons, &cons_block->conses[cons_block_index++]); | |
437 | } | |
438 | XCONS (val)->car = car; | |
439 | XCONS (val)->cdr = cdr; | |
440 | consing_since_gc += sizeof (struct Lisp_Cons); | |
441 | return val; | |
442 | } | |
443 | ||
444 | DEFUN ("list", Flist, Slist, 0, MANY, 0, | |
445 | "Return a newly created list with specified arguments as elements.\n\ | |
446 | Any number of arguments, even zero arguments, are allowed.") | |
447 | (nargs, args) | |
448 | int nargs; | |
449 | register Lisp_Object *args; | |
450 | { | |
451 | register Lisp_Object len, val, val_tail; | |
452 | ||
453 | XFASTINT (len) = nargs; | |
454 | val = Fmake_list (len, Qnil); | |
455 | val_tail = val; | |
265a9e55 | 456 | while (!NILP (val_tail)) |
7146af97 JB |
457 | { |
458 | XCONS (val_tail)->car = *args++; | |
459 | val_tail = XCONS (val_tail)->cdr; | |
460 | } | |
461 | return val; | |
462 | } | |
463 | ||
464 | DEFUN ("make-list", Fmake_list, Smake_list, 2, 2, 0, | |
465 | "Return a newly created list of length LENGTH, with each element being INIT.") | |
466 | (length, init) | |
467 | register Lisp_Object length, init; | |
468 | { | |
469 | register Lisp_Object val; | |
470 | register int size; | |
471 | ||
472 | if (XTYPE (length) != Lisp_Int || XINT (length) < 0) | |
473 | length = wrong_type_argument (Qnatnump, length); | |
474 | size = XINT (length); | |
475 | ||
476 | val = Qnil; | |
477 | while (size-- > 0) | |
478 | val = Fcons (init, val); | |
479 | return val; | |
480 | } | |
481 | \f | |
482 | /* Allocation of vectors */ | |
483 | ||
484 | struct Lisp_Vector *all_vectors; | |
485 | ||
486 | DEFUN ("make-vector", Fmake_vector, Smake_vector, 2, 2, 0, | |
487 | "Return a newly created vector of length LENGTH, with each element being INIT.\n\ | |
488 | See also the function `vector'.") | |
489 | (length, init) | |
490 | register Lisp_Object length, init; | |
491 | { | |
492 | register int sizei, index; | |
493 | register Lisp_Object vector; | |
494 | register struct Lisp_Vector *p; | |
495 | ||
496 | if (XTYPE (length) != Lisp_Int || XINT (length) < 0) | |
497 | length = wrong_type_argument (Qnatnump, length); | |
498 | sizei = XINT (length); | |
499 | ||
500 | p = (struct Lisp_Vector *) malloc (sizeof (struct Lisp_Vector) + (sizei - 1) * sizeof (Lisp_Object)); | |
501 | if (p == 0) | |
502 | memory_full (); | |
503 | VALIDATE_LISP_STORAGE (p, 0); | |
504 | ||
505 | XSET (vector, Lisp_Vector, p); | |
506 | consing_since_gc += sizeof (struct Lisp_Vector) + (sizei - 1) * sizeof (Lisp_Object); | |
507 | ||
508 | p->size = sizei; | |
509 | p->next = all_vectors; | |
510 | all_vectors = p; | |
511 | ||
512 | for (index = 0; index < sizei; index++) | |
513 | p->contents[index] = init; | |
514 | ||
515 | return vector; | |
516 | } | |
517 | ||
518 | DEFUN ("vector", Fvector, Svector, 0, MANY, 0, | |
519 | "Return a newly created vector with specified arguments as elements.\n\ | |
520 | Any number of arguments, even zero arguments, are allowed.") | |
521 | (nargs, args) | |
522 | register int nargs; | |
523 | Lisp_Object *args; | |
524 | { | |
525 | register Lisp_Object len, val; | |
526 | register int index; | |
527 | register struct Lisp_Vector *p; | |
528 | ||
529 | XFASTINT (len) = nargs; | |
530 | val = Fmake_vector (len, Qnil); | |
531 | p = XVECTOR (val); | |
532 | for (index = 0; index < nargs; index++) | |
533 | p->contents[index] = args[index]; | |
534 | return val; | |
535 | } | |
536 | ||
537 | DEFUN ("make-byte-code", Fmake_byte_code, Smake_byte_code, 4, MANY, 0, | |
538 | "Create a byte-code object with specified arguments as elements.\n\ | |
539 | The arguments should be the arglist, bytecode-string, constant vector,\n\ | |
540 | stack size, (optional) doc string, and (optional) interactive spec.\n\ | |
541 | The first four arguments are required; at most six have any\n\ | |
542 | significance.") | |
543 | (nargs, args) | |
544 | register int nargs; | |
545 | Lisp_Object *args; | |
546 | { | |
547 | register Lisp_Object len, val; | |
548 | register int index; | |
549 | register struct Lisp_Vector *p; | |
550 | ||
551 | XFASTINT (len) = nargs; | |
265a9e55 | 552 | if (!NILP (Vpurify_flag)) |
7146af97 JB |
553 | val = make_pure_vector (len); |
554 | else | |
555 | val = Fmake_vector (len, Qnil); | |
556 | p = XVECTOR (val); | |
557 | for (index = 0; index < nargs; index++) | |
558 | { | |
265a9e55 | 559 | if (!NILP (Vpurify_flag)) |
7146af97 JB |
560 | args[index] = Fpurecopy (args[index]); |
561 | p->contents[index] = args[index]; | |
562 | } | |
563 | XSETTYPE (val, Lisp_Compiled); | |
564 | return val; | |
565 | } | |
566 | \f | |
567 | /* Allocation of symbols. | |
568 | Just like allocation of conses! | |
569 | ||
570 | Each symbol_block is just under 1020 bytes long, | |
571 | since malloc really allocates in units of powers of two | |
572 | and uses 4 bytes for its own overhead. */ | |
573 | ||
574 | #define SYMBOL_BLOCK_SIZE \ | |
575 | ((1020 - sizeof (struct symbol_block *)) / sizeof (struct Lisp_Symbol)) | |
576 | ||
577 | struct symbol_block | |
578 | { | |
579 | struct symbol_block *next; | |
580 | struct Lisp_Symbol symbols[SYMBOL_BLOCK_SIZE]; | |
581 | }; | |
582 | ||
583 | struct symbol_block *symbol_block; | |
584 | int symbol_block_index; | |
585 | ||
586 | struct Lisp_Symbol *symbol_free_list; | |
587 | ||
588 | void | |
589 | init_symbol () | |
590 | { | |
591 | symbol_block = (struct symbol_block *) malloc (sizeof (struct symbol_block)); | |
592 | symbol_block->next = 0; | |
593 | bzero (symbol_block->symbols, sizeof symbol_block->symbols); | |
594 | symbol_block_index = 0; | |
595 | symbol_free_list = 0; | |
596 | } | |
597 | ||
598 | DEFUN ("make-symbol", Fmake_symbol, Smake_symbol, 1, 1, 0, | |
599 | "Return a newly allocated uninterned symbol whose name is NAME.\n\ | |
600 | Its value and function definition are void, and its property list is nil.") | |
601 | (str) | |
602 | Lisp_Object str; | |
603 | { | |
604 | register Lisp_Object val; | |
605 | register struct Lisp_Symbol *p; | |
606 | ||
607 | CHECK_STRING (str, 0); | |
608 | ||
609 | if (symbol_free_list) | |
610 | { | |
611 | XSET (val, Lisp_Symbol, symbol_free_list); | |
612 | symbol_free_list | |
613 | = (struct Lisp_Symbol *) XFASTINT (symbol_free_list->value); | |
614 | } | |
615 | else | |
616 | { | |
617 | if (symbol_block_index == SYMBOL_BLOCK_SIZE) | |
618 | { | |
619 | struct symbol_block *new = (struct symbol_block *) malloc (sizeof (struct symbol_block)); | |
620 | if (!new) memory_full (); | |
621 | VALIDATE_LISP_STORAGE (new, sizeof *new); | |
622 | new->next = symbol_block; | |
623 | symbol_block = new; | |
624 | symbol_block_index = 0; | |
625 | } | |
626 | XSET (val, Lisp_Symbol, &symbol_block->symbols[symbol_block_index++]); | |
627 | } | |
628 | p = XSYMBOL (val); | |
629 | p->name = XSTRING (str); | |
630 | p->plist = Qnil; | |
631 | p->value = Qunbound; | |
632 | p->function = Qunbound; | |
633 | p->next = 0; | |
634 | consing_since_gc += sizeof (struct Lisp_Symbol); | |
635 | return val; | |
636 | } | |
637 | \f | |
638 | /* Allocation of markers. | |
639 | Works like allocation of conses. */ | |
640 | ||
641 | #define MARKER_BLOCK_SIZE \ | |
642 | ((1020 - sizeof (struct marker_block *)) / sizeof (struct Lisp_Marker)) | |
643 | ||
644 | struct marker_block | |
645 | { | |
646 | struct marker_block *next; | |
647 | struct Lisp_Marker markers[MARKER_BLOCK_SIZE]; | |
648 | }; | |
649 | ||
650 | struct marker_block *marker_block; | |
651 | int marker_block_index; | |
652 | ||
653 | struct Lisp_Marker *marker_free_list; | |
654 | ||
655 | void | |
656 | init_marker () | |
657 | { | |
658 | marker_block = (struct marker_block *) malloc (sizeof (struct marker_block)); | |
659 | marker_block->next = 0; | |
660 | bzero (marker_block->markers, sizeof marker_block->markers); | |
661 | marker_block_index = 0; | |
662 | marker_free_list = 0; | |
663 | } | |
664 | ||
665 | DEFUN ("make-marker", Fmake_marker, Smake_marker, 0, 0, 0, | |
666 | "Return a newly allocated marker which does not point at any place.") | |
667 | () | |
668 | { | |
669 | register Lisp_Object val; | |
670 | register struct Lisp_Marker *p; | |
e065a56e | 671 | |
7146af97 JB |
672 | if (marker_free_list) |
673 | { | |
674 | XSET (val, Lisp_Marker, marker_free_list); | |
675 | marker_free_list | |
676 | = (struct Lisp_Marker *) XFASTINT (marker_free_list->chain); | |
677 | } | |
678 | else | |
679 | { | |
680 | if (marker_block_index == MARKER_BLOCK_SIZE) | |
681 | { | |
682 | struct marker_block *new = (struct marker_block *) malloc (sizeof (struct marker_block)); | |
683 | if (!new) memory_full (); | |
684 | VALIDATE_LISP_STORAGE (new, sizeof *new); | |
685 | new->next = marker_block; | |
686 | marker_block = new; | |
687 | marker_block_index = 0; | |
688 | } | |
689 | XSET (val, Lisp_Marker, &marker_block->markers[marker_block_index++]); | |
690 | } | |
691 | p = XMARKER (val); | |
692 | p->buffer = 0; | |
693 | p->bufpos = 0; | |
694 | p->chain = Qnil; | |
695 | consing_since_gc += sizeof (struct Lisp_Marker); | |
696 | return val; | |
697 | } | |
698 | \f | |
699 | /* Allocation of strings */ | |
700 | ||
701 | /* Strings reside inside of string_blocks. The entire data of the string, | |
702 | both the size and the contents, live in part of the `chars' component of a string_block. | |
703 | The `pos' component is the index within `chars' of the first free byte. | |
704 | ||
705 | first_string_block points to the first string_block ever allocated. | |
706 | Each block points to the next one with its `next' field. | |
707 | The `prev' fields chain in reverse order. | |
708 | The last one allocated is the one currently being filled. | |
709 | current_string_block points to it. | |
710 | ||
711 | The string_blocks that hold individual large strings | |
712 | go in a separate chain, started by large_string_blocks. */ | |
713 | ||
714 | ||
715 | /* String blocks contain this many useful bytes. | |
716 | 8188 is power of 2, minus 4 for malloc overhead. */ | |
717 | #define STRING_BLOCK_SIZE (8188 - sizeof (struct string_block_head)) | |
718 | ||
719 | /* A string bigger than this gets its own specially-made string block | |
720 | if it doesn't fit in the current one. */ | |
721 | #define STRING_BLOCK_OUTSIZE 1024 | |
722 | ||
723 | struct string_block_head | |
724 | { | |
725 | struct string_block *next, *prev; | |
726 | int pos; | |
727 | }; | |
728 | ||
729 | struct string_block | |
730 | { | |
731 | struct string_block *next, *prev; | |
732 | int pos; | |
733 | char chars[STRING_BLOCK_SIZE]; | |
734 | }; | |
735 | ||
736 | /* This points to the string block we are now allocating strings. */ | |
737 | ||
738 | struct string_block *current_string_block; | |
739 | ||
740 | /* This points to the oldest string block, the one that starts the chain. */ | |
741 | ||
742 | struct string_block *first_string_block; | |
743 | ||
744 | /* Last string block in chain of those made for individual large strings. */ | |
745 | ||
746 | struct string_block *large_string_blocks; | |
747 | ||
748 | /* If SIZE is the length of a string, this returns how many bytes | |
749 | the string occupies in a string_block (including padding). */ | |
750 | ||
751 | #define STRING_FULLSIZE(size) (((size) + sizeof (struct Lisp_String) + PAD) \ | |
752 | & ~(PAD - 1)) | |
753 | #define PAD (sizeof (int)) | |
754 | ||
755 | #if 0 | |
756 | #define STRING_FULLSIZE(SIZE) \ | |
757 | (((SIZE) + 2 * sizeof (int)) & ~(sizeof (int) - 1)) | |
758 | #endif | |
759 | ||
760 | void | |
761 | init_strings () | |
762 | { | |
763 | current_string_block = (struct string_block *) malloc (sizeof (struct string_block)); | |
764 | first_string_block = current_string_block; | |
765 | consing_since_gc += sizeof (struct string_block); | |
766 | current_string_block->next = 0; | |
767 | current_string_block->prev = 0; | |
768 | current_string_block->pos = 0; | |
769 | large_string_blocks = 0; | |
770 | } | |
771 | ||
772 | DEFUN ("make-string", Fmake_string, Smake_string, 2, 2, 0, | |
773 | "Return a newly created string of length LENGTH, with each element being INIT.\n\ | |
774 | Both LENGTH and INIT must be numbers.") | |
775 | (length, init) | |
776 | Lisp_Object length, init; | |
777 | { | |
778 | register Lisp_Object val; | |
779 | register unsigned char *p, *end, c; | |
780 | ||
781 | if (XTYPE (length) != Lisp_Int || XINT (length) < 0) | |
782 | length = wrong_type_argument (Qnatnump, length); | |
783 | CHECK_NUMBER (init, 1); | |
784 | val = make_uninit_string (XINT (length)); | |
785 | c = XINT (init); | |
786 | p = XSTRING (val)->data; | |
787 | end = p + XSTRING (val)->size; | |
788 | while (p != end) | |
789 | *p++ = c; | |
790 | *p = 0; | |
791 | return val; | |
792 | } | |
793 | ||
794 | Lisp_Object | |
795 | make_string (contents, length) | |
796 | char *contents; | |
797 | int length; | |
798 | { | |
799 | register Lisp_Object val; | |
800 | val = make_uninit_string (length); | |
801 | bcopy (contents, XSTRING (val)->data, length); | |
802 | return val; | |
803 | } | |
804 | ||
805 | Lisp_Object | |
806 | build_string (str) | |
807 | char *str; | |
808 | { | |
809 | return make_string (str, strlen (str)); | |
810 | } | |
811 | ||
812 | Lisp_Object | |
813 | make_uninit_string (length) | |
814 | int length; | |
815 | { | |
816 | register Lisp_Object val; | |
817 | register int fullsize = STRING_FULLSIZE (length); | |
818 | ||
819 | if (length < 0) abort (); | |
820 | ||
821 | if (fullsize <= STRING_BLOCK_SIZE - current_string_block->pos) | |
822 | /* This string can fit in the current string block */ | |
823 | { | |
824 | XSET (val, Lisp_String, | |
825 | (struct Lisp_String *) (current_string_block->chars + current_string_block->pos)); | |
826 | current_string_block->pos += fullsize; | |
827 | } | |
828 | else if (fullsize > STRING_BLOCK_OUTSIZE) | |
829 | /* This string gets its own string block */ | |
830 | { | |
831 | register struct string_block *new | |
832 | = (struct string_block *) malloc (sizeof (struct string_block_head) + fullsize); | |
833 | VALIDATE_LISP_STORAGE (new, 0); | |
834 | if (!new) memory_full (); | |
835 | consing_since_gc += sizeof (struct string_block_head) + fullsize; | |
836 | new->pos = fullsize; | |
837 | new->next = large_string_blocks; | |
838 | large_string_blocks = new; | |
839 | XSET (val, Lisp_String, | |
840 | (struct Lisp_String *) ((struct string_block_head *)new + 1)); | |
841 | } | |
842 | else | |
843 | /* Make a new current string block and start it off with this string */ | |
844 | { | |
845 | register struct string_block *new | |
846 | = (struct string_block *) malloc (sizeof (struct string_block)); | |
847 | if (!new) memory_full (); | |
848 | VALIDATE_LISP_STORAGE (new, sizeof *new); | |
849 | consing_since_gc += sizeof (struct string_block); | |
850 | current_string_block->next = new; | |
851 | new->prev = current_string_block; | |
852 | new->next = 0; | |
853 | current_string_block = new; | |
854 | new->pos = fullsize; | |
855 | XSET (val, Lisp_String, | |
856 | (struct Lisp_String *) current_string_block->chars); | |
857 | } | |
858 | ||
859 | XSTRING (val)->size = length; | |
860 | XSTRING (val)->data[length] = 0; | |
d5e35230 | 861 | INITIALIZE_INTERVAL (XSTRING (val), NULL_INTERVAL); |
7146af97 JB |
862 | |
863 | return val; | |
864 | } | |
865 | ||
866 | /* Return a newly created vector or string with specified arguments as | |
867 | elements. If all the arguments are characters, make a string; | |
868 | otherwise, make a vector. Any number of arguments, even zero | |
869 | arguments, are allowed. */ | |
870 | ||
871 | Lisp_Object | |
0feac52d | 872 | make_array (nargs, args) |
7146af97 JB |
873 | register int nargs; |
874 | Lisp_Object *args; | |
875 | { | |
876 | int i; | |
877 | ||
878 | for (i = 0; i < nargs; i++) | |
879 | if (XTYPE (args[i]) != Lisp_Int | |
880 | || (unsigned) XINT (args[i]) >= 0400) | |
881 | return Fvector (nargs, args); | |
882 | ||
883 | /* Since the loop exited, we know that all the things in it are | |
884 | characters, so we can make a string. */ | |
885 | { | |
886 | Lisp_Object result = Fmake_string (nargs, make_number (0)); | |
887 | ||
888 | for (i = 0; i < nargs; i++) | |
889 | XSTRING (result)->data[i] = XINT (args[i]); | |
890 | ||
891 | return result; | |
892 | } | |
893 | } | |
894 | \f | |
1a4f1e2c JB |
895 | /* Allocation of ropes. */ |
896 | ||
7146af97 JB |
897 | /* Note: the user cannot manipulate ropes portably by referring |
898 | to the chars of the string, because combining two chars to make a GLYPH | |
899 | depends on endianness. */ | |
900 | ||
901 | DEFUN ("make-rope", Fmake_rope, Smake_rope, 0, MANY, 0, | |
d5e7c279 | 902 | "Return a newly created rope containing the arguments of this function.\n\ |
7146af97 JB |
903 | A rope is a string, except that its contents will be treated as an\n\ |
904 | array of glyphs, where a glyph is an integer type that may be larger\n\ | |
905 | than a character. Emacs is normally configured to use 8-bit glyphs,\n\ | |
906 | so ropes are normally no different from strings. But Emacs may be\n\ | |
907 | configured to use 16-bit glyphs, to allow the use of larger fonts.\n\ | |
908 | \n\ | |
909 | Each argument (which must be an integer) specifies one glyph, whatever\n\ | |
910 | size glyphs may be.\n\ | |
911 | \n\ | |
912 | See variable `buffer-display-table' for the uses of ropes.") | |
913 | (nargs, args) | |
914 | register int nargs; | |
915 | Lisp_Object *args; | |
916 | { | |
917 | register int i; | |
918 | register Lisp_Object val; | |
919 | register GLYPH *p; | |
920 | ||
921 | val = make_uninit_string (nargs * sizeof (GLYPH)); | |
922 | ||
923 | p = (GLYPH *) XSTRING (val)->data; | |
924 | for (i = 0; i < nargs; i++) | |
925 | { | |
926 | CHECK_NUMBER (args[i], i); | |
927 | p[i] = XFASTINT (args[i]); | |
928 | } | |
929 | return val; | |
930 | } | |
931 | ||
932 | DEFUN ("rope-elt", Frope_elt, Srope_elt, 2, 2, 0, | |
933 | "Return an element of rope R at index N.\n\ | |
934 | A rope is a string in which each pair of bytes is considered an element.\n\ | |
935 | See variable `buffer-display-table' for the uses of ropes.") | |
936 | (r, n) | |
5bc1518a | 937 | Lisp_Object r, n; |
7146af97 JB |
938 | { |
939 | CHECK_STRING (r, 0); | |
940 | CHECK_NUMBER (n, 1); | |
941 | if ((XSTRING (r)->size / sizeof (GLYPH)) <= XINT (n) || XINT (n) < 0) | |
942 | args_out_of_range (r, n); | |
943 | return ((GLYPH *) XSTRING (r)->data)[XFASTINT (n)]; | |
944 | } | |
945 | \f | |
1a4f1e2c JB |
946 | /* Pure storage management. */ |
947 | ||
7146af97 JB |
948 | /* Must get an error if pure storage is full, |
949 | since if it cannot hold a large string | |
950 | it may be able to hold conses that point to that string; | |
951 | then the string is not protected from gc. */ | |
952 | ||
953 | Lisp_Object | |
954 | make_pure_string (data, length) | |
955 | char *data; | |
956 | int length; | |
957 | { | |
958 | register Lisp_Object new; | |
d5e35230 | 959 | register int size = sizeof (int) + INTERVAL_PTR_SIZE + length + 1; |
7146af97 JB |
960 | |
961 | if (pureptr + size > PURESIZE) | |
962 | error ("Pure Lisp storage exhausted"); | |
963 | XSET (new, Lisp_String, PUREBEG + pureptr); | |
964 | XSTRING (new)->size = length; | |
965 | bcopy (data, XSTRING (new)->data, length); | |
966 | XSTRING (new)->data[length] = 0; | |
967 | pureptr += (size + sizeof (int) - 1) | |
968 | / sizeof (int) * sizeof (int); | |
969 | return new; | |
970 | } | |
971 | ||
972 | Lisp_Object | |
973 | pure_cons (car, cdr) | |
974 | Lisp_Object car, cdr; | |
975 | { | |
976 | register Lisp_Object new; | |
977 | ||
978 | if (pureptr + sizeof (struct Lisp_Cons) > PURESIZE) | |
979 | error ("Pure Lisp storage exhausted"); | |
980 | XSET (new, Lisp_Cons, PUREBEG + pureptr); | |
981 | pureptr += sizeof (struct Lisp_Cons); | |
982 | XCONS (new)->car = Fpurecopy (car); | |
983 | XCONS (new)->cdr = Fpurecopy (cdr); | |
984 | return new; | |
985 | } | |
986 | ||
987 | #ifdef LISP_FLOAT_TYPE | |
988 | ||
989 | Lisp_Object | |
990 | make_pure_float (num) | |
991 | double num; | |
992 | { | |
993 | register Lisp_Object new; | |
fe90ad97 | 994 | int alignment; |
7146af97 | 995 | |
1a4f1e2c JB |
996 | /* Make sure that pureptr is aligned on at least a sizeof (double) |
997 | boundary. Some architectures (like the sparc) require this, and | |
998 | I suspect that floats are rare enough that it's no tragedy for | |
999 | those that do. */ | |
fe90ad97 JB |
1000 | #ifdef __GNUC__ |
1001 | #if __GNUC__ >= 2 | |
1002 | alignment = __alignof (struct Lisp_Float); | |
1003 | #else | |
1004 | alignment = sizeof (struct Lisp_Float); | |
1005 | #endif | |
1006 | #else | |
1007 | alignment = sizeof (struct Lisp_Float); | |
1008 | #endif | |
1009 | pureptr = (pureptr + alignment - 1) & - alignment; | |
1a4f1e2c | 1010 | |
7146af97 JB |
1011 | if (pureptr + sizeof (struct Lisp_Float) > PURESIZE) |
1012 | error ("Pure Lisp storage exhausted"); | |
1013 | XSET (new, Lisp_Float, PUREBEG + pureptr); | |
1014 | pureptr += sizeof (struct Lisp_Float); | |
1015 | XFLOAT (new)->data = num; | |
1016 | XFLOAT (new)->type = 0; /* bug chasing -wsr */ | |
1017 | return new; | |
1018 | } | |
1019 | ||
1020 | #endif /* LISP_FLOAT_TYPE */ | |
1021 | ||
1022 | Lisp_Object | |
1023 | make_pure_vector (len) | |
1024 | int len; | |
1025 | { | |
1026 | register Lisp_Object new; | |
1027 | register int size = sizeof (struct Lisp_Vector) + (len - 1) * sizeof (Lisp_Object); | |
1028 | ||
1029 | if (pureptr + size > PURESIZE) | |
1030 | error ("Pure Lisp storage exhausted"); | |
1031 | ||
1032 | XSET (new, Lisp_Vector, PUREBEG + pureptr); | |
1033 | pureptr += size; | |
1034 | XVECTOR (new)->size = len; | |
1035 | return new; | |
1036 | } | |
1037 | ||
1038 | DEFUN ("purecopy", Fpurecopy, Spurecopy, 1, 1, 0, | |
1039 | "Make a copy of OBJECT in pure storage.\n\ | |
1040 | Recursively copies contents of vectors and cons cells.\n\ | |
1041 | Does not copy symbols.") | |
1042 | (obj) | |
1043 | register Lisp_Object obj; | |
1044 | { | |
1045 | register Lisp_Object new, tem; | |
1046 | register int i; | |
1047 | ||
265a9e55 | 1048 | if (NILP (Vpurify_flag)) |
7146af97 JB |
1049 | return obj; |
1050 | ||
1051 | if ((PNTR_COMPARISON_TYPE) XPNTR (obj) < (PNTR_COMPARISON_TYPE) ((char *) pure + PURESIZE) | |
1052 | && (PNTR_COMPARISON_TYPE) XPNTR (obj) >= (PNTR_COMPARISON_TYPE) pure) | |
1053 | return obj; | |
1054 | ||
1055 | #ifdef SWITCH_ENUM_BUG | |
1056 | switch ((int) XTYPE (obj)) | |
1057 | #else | |
1058 | switch (XTYPE (obj)) | |
1059 | #endif | |
1060 | { | |
1061 | case Lisp_Marker: | |
1062 | error ("Attempt to copy a marker to pure storage"); | |
1063 | ||
1064 | case Lisp_Cons: | |
1065 | return pure_cons (XCONS (obj)->car, XCONS (obj)->cdr); | |
1066 | ||
1067 | #ifdef LISP_FLOAT_TYPE | |
1068 | case Lisp_Float: | |
1069 | return make_pure_float (XFLOAT (obj)->data); | |
1070 | #endif /* LISP_FLOAT_TYPE */ | |
1071 | ||
1072 | case Lisp_String: | |
1073 | return make_pure_string (XSTRING (obj)->data, XSTRING (obj)->size); | |
1074 | ||
1075 | case Lisp_Compiled: | |
1076 | case Lisp_Vector: | |
1077 | new = make_pure_vector (XVECTOR (obj)->size); | |
1078 | for (i = 0; i < XVECTOR (obj)->size; i++) | |
1079 | { | |
1080 | tem = XVECTOR (obj)->contents[i]; | |
1081 | XVECTOR (new)->contents[i] = Fpurecopy (tem); | |
1082 | } | |
1083 | XSETTYPE (new, XTYPE (obj)); | |
1084 | return new; | |
1085 | ||
1086 | default: | |
1087 | return obj; | |
1088 | } | |
1089 | } | |
1090 | \f | |
1091 | /* Recording what needs to be marked for gc. */ | |
1092 | ||
1093 | struct gcpro *gcprolist; | |
1094 | ||
daa37602 | 1095 | #define NSTATICS 512 |
7146af97 JB |
1096 | |
1097 | Lisp_Object *staticvec[NSTATICS] = {0}; | |
1098 | ||
1099 | int staticidx = 0; | |
1100 | ||
1101 | /* Put an entry in staticvec, pointing at the variable whose address is given */ | |
1102 | ||
1103 | void | |
1104 | staticpro (varaddress) | |
1105 | Lisp_Object *varaddress; | |
1106 | { | |
1107 | staticvec[staticidx++] = varaddress; | |
1108 | if (staticidx >= NSTATICS) | |
1109 | abort (); | |
1110 | } | |
1111 | ||
1112 | struct catchtag | |
1113 | { | |
1114 | Lisp_Object tag; | |
1115 | Lisp_Object val; | |
1116 | struct catchtag *next; | |
1117 | /* jmp_buf jmp; /* We don't need this for GC purposes */ | |
1118 | }; | |
1119 | ||
1120 | struct backtrace | |
1121 | { | |
1122 | struct backtrace *next; | |
1123 | Lisp_Object *function; | |
1124 | Lisp_Object *args; /* Points to vector of args. */ | |
1125 | int nargs; /* length of vector */ | |
1126 | /* if nargs is UNEVALLED, args points to slot holding list of unevalled args */ | |
1127 | char evalargs; | |
1128 | }; | |
1129 | ||
1130 | /* Two flags that are set during GC in the `size' component | |
1131 | of a string or vector. On some machines, these flags | |
1132 | are defined by the m- file to be different bits. */ | |
1133 | ||
1134 | /* On vector, means it has been marked. | |
1135 | On string size field or a reference to a string, | |
1136 | means not the last reference in the chain. */ | |
1137 | ||
1138 | #ifndef ARRAY_MARK_FLAG | |
1139 | #define ARRAY_MARK_FLAG ((MARKBIT >> 1) & ~MARKBIT) | |
1140 | #endif /* no ARRAY_MARK_FLAG */ | |
1141 | ||
1142 | /* Any slot that is a Lisp_Object can point to a string | |
1143 | and thus can be put on a string's reference-chain | |
1144 | and thus may need to have its ARRAY_MARK_FLAG set. | |
1145 | This includes the slots whose markbits are used to mark | |
1146 | the containing objects. */ | |
1147 | ||
1148 | #if ARRAY_MARK_FLAG == MARKBIT | |
1149 | you lose | |
1150 | #endif | |
1151 | \f | |
1a4f1e2c JB |
1152 | /* Garbage collection! */ |
1153 | ||
7146af97 JB |
1154 | int total_conses, total_markers, total_symbols, total_string_size, total_vector_size; |
1155 | int total_free_conses, total_free_markers, total_free_symbols; | |
1156 | #ifdef LISP_FLOAT_TYPE | |
1157 | int total_free_floats, total_floats; | |
1158 | #endif /* LISP_FLOAT_TYPE */ | |
1159 | ||
7146af97 JB |
1160 | DEFUN ("garbage-collect", Fgarbage_collect, Sgarbage_collect, 0, 0, "", |
1161 | "Reclaim storage for Lisp objects no longer needed.\n\ | |
1162 | Returns info on amount of space in use:\n\ | |
1163 | ((USED-CONSES . FREE-CONSES) (USED-SYMS . FREE-SYMS)\n\ | |
1164 | (USED-MARKERS . FREE-MARKERS) USED-STRING-CHARS USED-VECTOR-SLOTS\n\ | |
1165 | (USED-FLOATS . FREE-FLOATS))\n\ | |
1166 | Garbage collection happens automatically if you cons more than\n\ | |
1167 | `gc-cons-threshold' bytes of Lisp data since previous garbage collection.") | |
1168 | () | |
1169 | { | |
1170 | register struct gcpro *tail; | |
1171 | register struct specbinding *bind; | |
1172 | struct catchtag *catch; | |
1173 | struct handler *handler; | |
1174 | register struct backtrace *backlist; | |
1175 | register Lisp_Object tem; | |
1176 | char *omessage = echo_area_glyphs; | |
1177 | char stack_top_variable; | |
1178 | register int i; | |
1179 | ||
7146af97 JB |
1180 | /* Save a copy of the contents of the stack, for debugging. */ |
1181 | #if MAX_SAVE_STACK > 0 | |
265a9e55 | 1182 | if (NILP (Vpurify_flag)) |
7146af97 JB |
1183 | { |
1184 | i = &stack_top_variable - stack_bottom; | |
1185 | if (i < 0) i = -i; | |
1186 | if (i < MAX_SAVE_STACK) | |
1187 | { | |
1188 | if (stack_copy == 0) | |
1189 | stack_copy = (char *) malloc (stack_copy_size = i); | |
1190 | else if (stack_copy_size < i) | |
1191 | stack_copy = (char *) realloc (stack_copy, (stack_copy_size = i)); | |
1192 | if (stack_copy) | |
1193 | { | |
1194 | if ((int) (&stack_top_variable - stack_bottom) > 0) | |
1195 | bcopy (stack_bottom, stack_copy, i); | |
1196 | else | |
1197 | bcopy (&stack_top_variable, stack_copy, i); | |
1198 | } | |
1199 | } | |
1200 | } | |
1201 | #endif /* MAX_SAVE_STACK > 0 */ | |
1202 | ||
1203 | if (!noninteractive) | |
1204 | message1 ("Garbage collecting..."); | |
1205 | ||
1206 | /* Don't keep command history around forever */ | |
1207 | tem = Fnthcdr (make_number (30), Vcommand_history); | |
1208 | if (CONSP (tem)) | |
1209 | XCONS (tem)->cdr = Qnil; | |
ffd56f97 | 1210 | |
7146af97 JB |
1211 | /* Likewise for undo information. */ |
1212 | { | |
1213 | register struct buffer *nextb = all_buffers; | |
1214 | ||
1215 | while (nextb) | |
1216 | { | |
ffd56f97 JB |
1217 | /* If a buffer's undo list is Qt, that means that undo is |
1218 | turned off in that buffer. Calling truncate_undo_list on | |
1219 | Qt tends to return NULL, which effectively turns undo back on. | |
1220 | So don't call truncate_undo_list if undo_list is Qt. */ | |
1221 | if (! EQ (nextb->undo_list, Qt)) | |
1222 | nextb->undo_list | |
502b9b64 JB |
1223 | = truncate_undo_list (nextb->undo_list, undo_limit, |
1224 | undo_strong_limit); | |
7146af97 JB |
1225 | nextb = nextb->next; |
1226 | } | |
1227 | } | |
1228 | ||
1229 | gc_in_progress = 1; | |
1230 | ||
1231 | /* clear_marks (); */ | |
1232 | ||
1233 | /* In each "large string", set the MARKBIT of the size field. | |
1234 | That enables mark_object to recognize them. */ | |
1235 | { | |
1236 | register struct string_block *b; | |
1237 | for (b = large_string_blocks; b; b = b->next) | |
1238 | ((struct Lisp_String *)(&b->chars[0]))->size |= MARKBIT; | |
1239 | } | |
1240 | ||
1241 | /* Mark all the special slots that serve as the roots of accessibility. | |
1242 | ||
1243 | Usually the special slots to mark are contained in particular structures. | |
1244 | Then we know no slot is marked twice because the structures don't overlap. | |
1245 | In some cases, the structures point to the slots to be marked. | |
1246 | For these, we use MARKBIT to avoid double marking of the slot. */ | |
1247 | ||
1248 | for (i = 0; i < staticidx; i++) | |
1249 | mark_object (staticvec[i]); | |
1250 | for (tail = gcprolist; tail; tail = tail->next) | |
1251 | for (i = 0; i < tail->nvars; i++) | |
1252 | if (!XMARKBIT (tail->var[i])) | |
1253 | { | |
1254 | mark_object (&tail->var[i]); | |
1255 | XMARK (tail->var[i]); | |
1256 | } | |
1257 | for (bind = specpdl; bind != specpdl_ptr; bind++) | |
1258 | { | |
1259 | mark_object (&bind->symbol); | |
1260 | mark_object (&bind->old_value); | |
1261 | } | |
1262 | for (catch = catchlist; catch; catch = catch->next) | |
1263 | { | |
1264 | mark_object (&catch->tag); | |
1265 | mark_object (&catch->val); | |
1266 | } | |
1267 | for (handler = handlerlist; handler; handler = handler->next) | |
1268 | { | |
1269 | mark_object (&handler->handler); | |
1270 | mark_object (&handler->var); | |
1271 | } | |
1272 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
1273 | { | |
1274 | if (!XMARKBIT (*backlist->function)) | |
1275 | { | |
1276 | mark_object (backlist->function); | |
1277 | XMARK (*backlist->function); | |
1278 | } | |
1279 | if (backlist->nargs == UNEVALLED || backlist->nargs == MANY) | |
1280 | i = 0; | |
1281 | else | |
1282 | i = backlist->nargs - 1; | |
1283 | for (; i >= 0; i--) | |
1284 | if (!XMARKBIT (backlist->args[i])) | |
1285 | { | |
1286 | mark_object (&backlist->args[i]); | |
1287 | XMARK (backlist->args[i]); | |
1288 | } | |
1289 | } | |
1290 | ||
1291 | gc_sweep (); | |
1292 | ||
1293 | /* Clear the mark bits that we set in certain root slots. */ | |
1294 | ||
1295 | for (tail = gcprolist; tail; tail = tail->next) | |
1296 | for (i = 0; i < tail->nvars; i++) | |
1297 | XUNMARK (tail->var[i]); | |
1298 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
1299 | { | |
1300 | XUNMARK (*backlist->function); | |
1301 | if (backlist->nargs == UNEVALLED || backlist->nargs == MANY) | |
1302 | i = 0; | |
1303 | else | |
1304 | i = backlist->nargs - 1; | |
1305 | for (; i >= 0; i--) | |
1306 | XUNMARK (backlist->args[i]); | |
1307 | } | |
1308 | XUNMARK (buffer_defaults.name); | |
1309 | XUNMARK (buffer_local_symbols.name); | |
1310 | ||
1311 | /* clear_marks (); */ | |
1312 | gc_in_progress = 0; | |
1313 | ||
1314 | consing_since_gc = 0; | |
1315 | if (gc_cons_threshold < 10000) | |
1316 | gc_cons_threshold = 10000; | |
1317 | ||
1318 | if (omessage) | |
1319 | message1 (omessage); | |
1320 | else if (!noninteractive) | |
1321 | message1 ("Garbage collecting...done"); | |
1322 | ||
7146af97 JB |
1323 | return Fcons (Fcons (make_number (total_conses), |
1324 | make_number (total_free_conses)), | |
1325 | Fcons (Fcons (make_number (total_symbols), | |
1326 | make_number (total_free_symbols)), | |
1327 | Fcons (Fcons (make_number (total_markers), | |
1328 | make_number (total_free_markers)), | |
1329 | Fcons (make_number (total_string_size), | |
1330 | Fcons (make_number (total_vector_size), | |
1331 | ||
1332 | #ifdef LISP_FLOAT_TYPE | |
1333 | Fcons (Fcons (make_number (total_floats), | |
1334 | make_number (total_free_floats)), | |
1335 | Qnil) | |
1336 | #else /* not LISP_FLOAT_TYPE */ | |
1337 | Qnil | |
1338 | #endif /* not LISP_FLOAT_TYPE */ | |
1339 | ))))); | |
1340 | } | |
1341 | \f | |
1342 | #if 0 | |
1343 | static void | |
1344 | clear_marks () | |
1345 | { | |
1346 | /* Clear marks on all conses */ | |
1347 | { | |
1348 | register struct cons_block *cblk; | |
1349 | register int lim = cons_block_index; | |
1350 | ||
1351 | for (cblk = cons_block; cblk; cblk = cblk->next) | |
1352 | { | |
1353 | register int i; | |
1354 | for (i = 0; i < lim; i++) | |
1355 | XUNMARK (cblk->conses[i].car); | |
1356 | lim = CONS_BLOCK_SIZE; | |
1357 | } | |
1358 | } | |
1359 | /* Clear marks on all symbols */ | |
1360 | { | |
1361 | register struct symbol_block *sblk; | |
1362 | register int lim = symbol_block_index; | |
1363 | ||
1364 | for (sblk = symbol_block; sblk; sblk = sblk->next) | |
1365 | { | |
1366 | register int i; | |
1367 | for (i = 0; i < lim; i++) | |
1368 | { | |
1369 | XUNMARK (sblk->symbols[i].plist); | |
1370 | } | |
1371 | lim = SYMBOL_BLOCK_SIZE; | |
1372 | } | |
1373 | } | |
1374 | /* Clear marks on all markers */ | |
1375 | { | |
1376 | register struct marker_block *sblk; | |
1377 | register int lim = marker_block_index; | |
1378 | ||
1379 | for (sblk = marker_block; sblk; sblk = sblk->next) | |
1380 | { | |
1381 | register int i; | |
1382 | for (i = 0; i < lim; i++) | |
1383 | XUNMARK (sblk->markers[i].chain); | |
1384 | lim = MARKER_BLOCK_SIZE; | |
1385 | } | |
1386 | } | |
1387 | /* Clear mark bits on all buffers */ | |
1388 | { | |
1389 | register struct buffer *nextb = all_buffers; | |
1390 | ||
1391 | while (nextb) | |
1392 | { | |
1393 | XUNMARK (nextb->name); | |
1394 | nextb = nextb->next; | |
1395 | } | |
1396 | } | |
1397 | } | |
1398 | #endif | |
1399 | \f | |
1a4f1e2c JB |
1400 | /* Mark reference to a Lisp_Object. |
1401 | If the object referred to has not been seen yet, recursively mark | |
1402 | all the references contained in it. | |
7146af97 JB |
1403 | |
1404 | If the object referenced is a short string, the referrencing slot | |
1405 | is threaded into a chain of such slots, pointed to from | |
1406 | the `size' field of the string. The actual string size | |
1407 | lives in the last slot in the chain. We recognize the end | |
1408 | because it is < (unsigned) STRING_BLOCK_SIZE. */ | |
1409 | ||
785cd37f RS |
1410 | #define LAST_MARKED_SIZE 500 |
1411 | Lisp_Object *last_marked[LAST_MARKED_SIZE]; | |
1412 | int last_marked_index; | |
1413 | ||
7146af97 JB |
1414 | static void |
1415 | mark_object (objptr) | |
1416 | Lisp_Object *objptr; | |
1417 | { | |
1418 | register Lisp_Object obj; | |
1419 | ||
1420 | obj = *objptr; | |
1421 | XUNMARK (obj); | |
1422 | ||
1423 | loop: | |
1424 | ||
1425 | if ((PNTR_COMPARISON_TYPE) XPNTR (obj) < (PNTR_COMPARISON_TYPE) ((char *) pure + PURESIZE) | |
1426 | && (PNTR_COMPARISON_TYPE) XPNTR (obj) >= (PNTR_COMPARISON_TYPE) pure) | |
1427 | return; | |
1428 | ||
785cd37f RS |
1429 | last_marked[last_marked_index++] = objptr; |
1430 | if (last_marked_index == LAST_MARKED_SIZE) | |
1431 | last_marked_index = 0; | |
1432 | ||
7146af97 JB |
1433 | #ifdef SWITCH_ENUM_BUG |
1434 | switch ((int) XGCTYPE (obj)) | |
1435 | #else | |
1436 | switch (XGCTYPE (obj)) | |
1437 | #endif | |
1438 | { | |
1439 | case Lisp_String: | |
1440 | { | |
1441 | register struct Lisp_String *ptr = XSTRING (obj); | |
1442 | ||
d5e35230 | 1443 | MARK_INTERVAL_TREE (ptr->intervals); |
7146af97 JB |
1444 | if (ptr->size & MARKBIT) |
1445 | /* A large string. Just set ARRAY_MARK_FLAG. */ | |
1446 | ptr->size |= ARRAY_MARK_FLAG; | |
1447 | else | |
1448 | { | |
1449 | /* A small string. Put this reference | |
1450 | into the chain of references to it. | |
1451 | The address OBJPTR is even, so if the address | |
1452 | includes MARKBIT, put it in the low bit | |
1453 | when we store OBJPTR into the size field. */ | |
1454 | ||
1455 | if (XMARKBIT (*objptr)) | |
1456 | { | |
1457 | XFASTINT (*objptr) = ptr->size; | |
1458 | XMARK (*objptr); | |
1459 | } | |
1460 | else | |
1461 | XFASTINT (*objptr) = ptr->size; | |
1462 | if ((int)objptr & 1) abort (); | |
1463 | ptr->size = (int) objptr & ~MARKBIT; | |
1464 | if ((int) objptr & MARKBIT) | |
1465 | ptr->size ++; | |
1466 | } | |
1467 | } | |
1468 | break; | |
1469 | ||
1470 | case Lisp_Vector: | |
1471 | case Lisp_Window: | |
1472 | case Lisp_Process: | |
1473 | case Lisp_Window_Configuration: | |
7146af97 JB |
1474 | { |
1475 | register struct Lisp_Vector *ptr = XVECTOR (obj); | |
1476 | register int size = ptr->size; | |
785cd37f | 1477 | struct Lisp_Vector *volatile ptr1 = ptr; |
7146af97 JB |
1478 | register int i; |
1479 | ||
1480 | if (size & ARRAY_MARK_FLAG) break; /* Already marked */ | |
1481 | ptr->size |= ARRAY_MARK_FLAG; /* Else mark it */ | |
1482 | for (i = 0; i < size; i++) /* and then mark its elements */ | |
785cd37f RS |
1483 | { |
1484 | if (ptr != ptr1) | |
1485 | abort (); | |
1486 | mark_object (&ptr->contents[i]); | |
1487 | } | |
7146af97 JB |
1488 | } |
1489 | break; | |
1490 | ||
c54ca951 RS |
1491 | case Lisp_Compiled: |
1492 | /* We could treat this just like a vector, but it is better | |
1493 | to save the COMPILED_CONSTANTS element for last and avoid recursion | |
1494 | there. */ | |
1495 | { | |
1496 | register struct Lisp_Vector *ptr = XVECTOR (obj); | |
1497 | register int size = ptr->size; | |
1498 | struct Lisp_Vector *volatile ptr1 = ptr; | |
1499 | register int i; | |
1500 | ||
1501 | if (size & ARRAY_MARK_FLAG) break; /* Already marked */ | |
1502 | ptr->size |= ARRAY_MARK_FLAG; /* Else mark it */ | |
1503 | for (i = 0; i < size; i++) /* and then mark its elements */ | |
1504 | { | |
1505 | if (ptr != ptr1) | |
1506 | abort (); | |
1507 | if (i != COMPILED_CONSTANTS) | |
1508 | mark_object (&ptr->contents[i]); | |
1509 | } | |
1510 | objptr = &ptr->contents[COMPILED_CONSTANTS]; | |
1511 | obj = *objptr; | |
1512 | goto loop; | |
1513 | } | |
1514 | ||
502b9b64 JB |
1515 | #ifdef MULTI_FRAME |
1516 | case Lisp_Frame: | |
7146af97 | 1517 | { |
502b9b64 | 1518 | register struct frame *ptr = XFRAME (obj); |
7146af97 | 1519 | register int size = ptr->size; |
7146af97 JB |
1520 | |
1521 | if (size & ARRAY_MARK_FLAG) break; /* Already marked */ | |
1522 | ptr->size |= ARRAY_MARK_FLAG; /* Else mark it */ | |
1523 | ||
1524 | mark_object (&ptr->name); | |
502b9b64 | 1525 | mark_object (&ptr->focus_frame); |
7146af97 JB |
1526 | mark_object (&ptr->width); |
1527 | mark_object (&ptr->height); | |
1528 | mark_object (&ptr->selected_window); | |
1529 | mark_object (&ptr->minibuffer_window); | |
1530 | mark_object (&ptr->param_alist); | |
7c299e7a JB |
1531 | mark_object (&ptr->scrollbars); |
1532 | mark_object (&ptr->condemned_scrollbars); | |
7146af97 JB |
1533 | } |
1534 | break; | |
42a9cd6a | 1535 | #endif /* not MULTI_FRAME */ |
7146af97 | 1536 | |
7146af97 JB |
1537 | case Lisp_Symbol: |
1538 | { | |
1539 | register struct Lisp_Symbol *ptr = XSYMBOL (obj); | |
1540 | struct Lisp_Symbol *ptrx; | |
1541 | ||
1542 | if (XMARKBIT (ptr->plist)) break; | |
1543 | XMARK (ptr->plist); | |
7146af97 JB |
1544 | mark_object ((Lisp_Object *) &ptr->value); |
1545 | mark_object (&ptr->function); | |
1546 | mark_object (&ptr->plist); | |
8aaa7c8a JB |
1547 | XSETTYPE (*(Lisp_Object *) &ptr->name, Lisp_String); |
1548 | mark_object (&ptr->name); | |
7146af97 JB |
1549 | ptr = ptr->next; |
1550 | if (ptr) | |
1551 | { | |
1552 | ptrx = ptr; /* Use pf ptrx avoids compiler bug on Sun */ | |
1553 | XSETSYMBOL (obj, ptrx); | |
1554 | goto loop; | |
1555 | } | |
1556 | } | |
1557 | break; | |
1558 | ||
1559 | case Lisp_Marker: | |
1560 | XMARK (XMARKER (obj)->chain); | |
1561 | /* DO NOT mark thru the marker's chain. | |
1562 | The buffer's markers chain does not preserve markers from gc; | |
c54ca951 | 1563 | instead, markers are removed from the chain when freed by gc. */ |
7146af97 JB |
1564 | break; |
1565 | ||
1566 | case Lisp_Cons: | |
1567 | case Lisp_Buffer_Local_Value: | |
1568 | case Lisp_Some_Buffer_Local_Value: | |
1569 | { | |
1570 | register struct Lisp_Cons *ptr = XCONS (obj); | |
1571 | if (XMARKBIT (ptr->car)) break; | |
1572 | XMARK (ptr->car); | |
c54ca951 RS |
1573 | /* If the cdr is nil, avoid recursion for the car. */ |
1574 | if (EQ (ptr->cdr, Qnil)) | |
1575 | { | |
1576 | objptr = &ptr->car; | |
1577 | obj = ptr->car; | |
1578 | XUNMARK (obj); | |
1579 | goto loop; | |
1580 | } | |
7146af97 JB |
1581 | mark_object (&ptr->car); |
1582 | objptr = &ptr->cdr; | |
1583 | obj = ptr->cdr; | |
1584 | goto loop; | |
1585 | } | |
1586 | ||
1587 | #ifdef LISP_FLOAT_TYPE | |
1588 | case Lisp_Float: | |
1589 | XMARK (XFLOAT (obj)->type); | |
1590 | break; | |
1591 | #endif /* LISP_FLOAT_TYPE */ | |
1592 | ||
1593 | case Lisp_Buffer: | |
1594 | if (!XMARKBIT (XBUFFER (obj)->name)) | |
1595 | mark_buffer (obj); | |
1596 | break; | |
1597 | ||
1598 | case Lisp_Int: | |
1599 | case Lisp_Void: | |
1600 | case Lisp_Subr: | |
1601 | case Lisp_Intfwd: | |
1602 | case Lisp_Boolfwd: | |
1603 | case Lisp_Objfwd: | |
1604 | case Lisp_Buffer_Objfwd: | |
1605 | case Lisp_Internal_Stream: | |
1606 | /* Don't bother with Lisp_Buffer_Objfwd, | |
1607 | since all markable slots in current buffer marked anyway. */ | |
1608 | /* Don't need to do Lisp_Objfwd, since the places they point | |
1609 | are protected with staticpro. */ | |
1610 | break; | |
1611 | ||
1612 | default: | |
1613 | abort (); | |
1614 | } | |
1615 | } | |
1616 | ||
1617 | /* Mark the pointers in a buffer structure. */ | |
1618 | ||
1619 | static void | |
1620 | mark_buffer (buf) | |
1621 | Lisp_Object buf; | |
1622 | { | |
7146af97 JB |
1623 | register struct buffer *buffer = XBUFFER (buf); |
1624 | register Lisp_Object *ptr; | |
1625 | ||
1626 | /* This is the buffer's markbit */ | |
1627 | mark_object (&buffer->name); | |
1628 | XMARK (buffer->name); | |
1629 | ||
d5e35230 JA |
1630 | MARK_INTERVAL_TREE (buffer->intervals); |
1631 | ||
7146af97 JB |
1632 | #if 0 |
1633 | mark_object (buffer->syntax_table); | |
1634 | ||
1635 | /* Mark the various string-pointers in the buffer object. | |
1636 | Since the strings may be relocated, we must mark them | |
1637 | in their actual slots. So gc_sweep must convert each slot | |
1638 | back to an ordinary C pointer. */ | |
1639 | XSET (*(Lisp_Object *)&buffer->upcase_table, | |
1640 | Lisp_String, buffer->upcase_table); | |
1641 | mark_object ((Lisp_Object *)&buffer->upcase_table); | |
1642 | XSET (*(Lisp_Object *)&buffer->downcase_table, | |
1643 | Lisp_String, buffer->downcase_table); | |
1644 | mark_object ((Lisp_Object *)&buffer->downcase_table); | |
1645 | ||
1646 | XSET (*(Lisp_Object *)&buffer->sort_table, | |
1647 | Lisp_String, buffer->sort_table); | |
1648 | mark_object ((Lisp_Object *)&buffer->sort_table); | |
1649 | XSET (*(Lisp_Object *)&buffer->folding_sort_table, | |
1650 | Lisp_String, buffer->folding_sort_table); | |
1651 | mark_object ((Lisp_Object *)&buffer->folding_sort_table); | |
1652 | #endif | |
1653 | ||
1654 | for (ptr = &buffer->name + 1; | |
1655 | (char *)ptr < (char *)buffer + sizeof (struct buffer); | |
1656 | ptr++) | |
1657 | mark_object (ptr); | |
1658 | } | |
1659 | \f | |
1a4f1e2c | 1660 | /* Sweep: find all structures not marked, and free them. */ |
7146af97 JB |
1661 | |
1662 | static void | |
1663 | gc_sweep () | |
1664 | { | |
1665 | total_string_size = 0; | |
1666 | compact_strings (); | |
1667 | ||
1668 | /* Put all unmarked conses on free list */ | |
1669 | { | |
1670 | register struct cons_block *cblk; | |
1671 | register int lim = cons_block_index; | |
1672 | register int num_free = 0, num_used = 0; | |
1673 | ||
1674 | cons_free_list = 0; | |
1675 | ||
1676 | for (cblk = cons_block; cblk; cblk = cblk->next) | |
1677 | { | |
1678 | register int i; | |
1679 | for (i = 0; i < lim; i++) | |
1680 | if (!XMARKBIT (cblk->conses[i].car)) | |
1681 | { | |
1682 | XFASTINT (cblk->conses[i].car) = (int) cons_free_list; | |
1683 | num_free++; | |
1684 | cons_free_list = &cblk->conses[i]; | |
1685 | } | |
1686 | else | |
1687 | { | |
1688 | num_used++; | |
1689 | XUNMARK (cblk->conses[i].car); | |
1690 | } | |
1691 | lim = CONS_BLOCK_SIZE; | |
1692 | } | |
1693 | total_conses = num_used; | |
1694 | total_free_conses = num_free; | |
1695 | } | |
1696 | ||
1697 | #ifdef LISP_FLOAT_TYPE | |
1698 | /* Put all unmarked floats on free list */ | |
1699 | { | |
1700 | register struct float_block *fblk; | |
1701 | register int lim = float_block_index; | |
1702 | register int num_free = 0, num_used = 0; | |
1703 | ||
1704 | float_free_list = 0; | |
1705 | ||
1706 | for (fblk = float_block; fblk; fblk = fblk->next) | |
1707 | { | |
1708 | register int i; | |
1709 | for (i = 0; i < lim; i++) | |
1710 | if (!XMARKBIT (fblk->floats[i].type)) | |
1711 | { | |
1712 | XFASTINT (fblk->floats[i].type) = (int) float_free_list; | |
1713 | num_free++; | |
1714 | float_free_list = &fblk->floats[i]; | |
1715 | } | |
1716 | else | |
1717 | { | |
1718 | num_used++; | |
1719 | XUNMARK (fblk->floats[i].type); | |
1720 | } | |
1721 | lim = FLOAT_BLOCK_SIZE; | |
1722 | } | |
1723 | total_floats = num_used; | |
1724 | total_free_floats = num_free; | |
1725 | } | |
1726 | #endif /* LISP_FLOAT_TYPE */ | |
1727 | ||
d5e35230 JA |
1728 | #ifdef USE_TEXT_PROPERTIES |
1729 | /* Put all unmarked intervals on free list */ | |
1730 | { | |
1731 | register struct interval_block *iblk; | |
1732 | register int lim = interval_block_index; | |
1733 | register int num_free = 0, num_used = 0; | |
1734 | ||
1735 | interval_free_list = 0; | |
1736 | ||
1737 | for (iblk = interval_block; iblk; iblk = iblk->next) | |
1738 | { | |
1739 | register int i; | |
1740 | ||
1741 | for (i = 0; i < lim; i++) | |
1742 | { | |
1743 | if (! XMARKBIT (iblk->intervals[i].plist)) | |
1744 | { | |
1745 | iblk->intervals[i].parent = interval_free_list; | |
1746 | interval_free_list = &iblk->intervals[i]; | |
1747 | num_free++; | |
1748 | } | |
1749 | else | |
1750 | { | |
1751 | num_used++; | |
1752 | XUNMARK (iblk->intervals[i].plist); | |
1753 | } | |
1754 | } | |
1755 | lim = INTERVAL_BLOCK_SIZE; | |
1756 | } | |
1757 | total_intervals = num_used; | |
1758 | total_free_intervals = num_free; | |
1759 | } | |
1760 | #endif /* USE_TEXT_PROPERTIES */ | |
1761 | ||
7146af97 JB |
1762 | /* Put all unmarked symbols on free list */ |
1763 | { | |
1764 | register struct symbol_block *sblk; | |
1765 | register int lim = symbol_block_index; | |
1766 | register int num_free = 0, num_used = 0; | |
1767 | ||
1768 | symbol_free_list = 0; | |
1769 | ||
1770 | for (sblk = symbol_block; sblk; sblk = sblk->next) | |
1771 | { | |
1772 | register int i; | |
1773 | for (i = 0; i < lim; i++) | |
1774 | if (!XMARKBIT (sblk->symbols[i].plist)) | |
1775 | { | |
1776 | XFASTINT (sblk->symbols[i].value) = (int) symbol_free_list; | |
1777 | symbol_free_list = &sblk->symbols[i]; | |
1778 | num_free++; | |
1779 | } | |
1780 | else | |
1781 | { | |
1782 | num_used++; | |
1783 | sblk->symbols[i].name | |
1784 | = XSTRING (*(Lisp_Object *) &sblk->symbols[i].name); | |
1785 | XUNMARK (sblk->symbols[i].plist); | |
1786 | } | |
1787 | lim = SYMBOL_BLOCK_SIZE; | |
1788 | } | |
1789 | total_symbols = num_used; | |
1790 | total_free_symbols = num_free; | |
1791 | } | |
1792 | ||
1793 | #ifndef standalone | |
1794 | /* Put all unmarked markers on free list. | |
1795 | Dechain each one first from the buffer it points into. */ | |
1796 | { | |
1797 | register struct marker_block *mblk; | |
1798 | struct Lisp_Marker *tem1; | |
1799 | register int lim = marker_block_index; | |
1800 | register int num_free = 0, num_used = 0; | |
1801 | ||
1802 | marker_free_list = 0; | |
1803 | ||
1804 | for (mblk = marker_block; mblk; mblk = mblk->next) | |
1805 | { | |
1806 | register int i; | |
1807 | for (i = 0; i < lim; i++) | |
1808 | if (!XMARKBIT (mblk->markers[i].chain)) | |
1809 | { | |
1810 | Lisp_Object tem; | |
1811 | tem1 = &mblk->markers[i]; /* tem1 avoids Sun compiler bug */ | |
1812 | XSET (tem, Lisp_Marker, tem1); | |
1813 | unchain_marker (tem); | |
1814 | XFASTINT (mblk->markers[i].chain) = (int) marker_free_list; | |
1815 | marker_free_list = &mblk->markers[i]; | |
1816 | num_free++; | |
1817 | } | |
1818 | else | |
1819 | { | |
1820 | num_used++; | |
1821 | XUNMARK (mblk->markers[i].chain); | |
1822 | } | |
1823 | lim = MARKER_BLOCK_SIZE; | |
1824 | } | |
1825 | ||
1826 | total_markers = num_used; | |
1827 | total_free_markers = num_free; | |
1828 | } | |
1829 | ||
1830 | /* Free all unmarked buffers */ | |
1831 | { | |
1832 | register struct buffer *buffer = all_buffers, *prev = 0, *next; | |
1833 | ||
1834 | while (buffer) | |
1835 | if (!XMARKBIT (buffer->name)) | |
1836 | { | |
1837 | if (prev) | |
1838 | prev->next = buffer->next; | |
1839 | else | |
1840 | all_buffers = buffer->next; | |
1841 | next = buffer->next; | |
1842 | free (buffer); | |
1843 | buffer = next; | |
1844 | } | |
1845 | else | |
1846 | { | |
1847 | XUNMARK (buffer->name); | |
d5e35230 | 1848 | UNMARK_BALANCE_INTERVALS (buffer->intervals); |
7146af97 JB |
1849 | |
1850 | #if 0 | |
1851 | /* Each `struct Lisp_String *' was turned into a Lisp_Object | |
1852 | for purposes of marking and relocation. | |
1853 | Turn them back into C pointers now. */ | |
1854 | buffer->upcase_table | |
1855 | = XSTRING (*(Lisp_Object *)&buffer->upcase_table); | |
1856 | buffer->downcase_table | |
1857 | = XSTRING (*(Lisp_Object *)&buffer->downcase_table); | |
1858 | buffer->sort_table | |
1859 | = XSTRING (*(Lisp_Object *)&buffer->sort_table); | |
1860 | buffer->folding_sort_table | |
1861 | = XSTRING (*(Lisp_Object *)&buffer->folding_sort_table); | |
1862 | #endif | |
1863 | ||
1864 | prev = buffer, buffer = buffer->next; | |
1865 | } | |
1866 | } | |
1867 | ||
1868 | #endif /* standalone */ | |
1869 | ||
1870 | /* Free all unmarked vectors */ | |
1871 | { | |
1872 | register struct Lisp_Vector *vector = all_vectors, *prev = 0, *next; | |
1873 | total_vector_size = 0; | |
1874 | ||
1875 | while (vector) | |
1876 | if (!(vector->size & ARRAY_MARK_FLAG)) | |
1877 | { | |
1878 | if (prev) | |
1879 | prev->next = vector->next; | |
1880 | else | |
1881 | all_vectors = vector->next; | |
1882 | next = vector->next; | |
1883 | free (vector); | |
1884 | vector = next; | |
1885 | } | |
1886 | else | |
1887 | { | |
1888 | vector->size &= ~ARRAY_MARK_FLAG; | |
1889 | total_vector_size += vector->size; | |
1890 | prev = vector, vector = vector->next; | |
1891 | } | |
1892 | } | |
1893 | ||
1894 | /* Free all "large strings" not marked with ARRAY_MARK_FLAG. */ | |
1895 | { | |
1896 | register struct string_block *sb = large_string_blocks, *prev = 0, *next; | |
1897 | ||
1898 | while (sb) | |
1899 | if (!(((struct Lisp_String *)(&sb->chars[0]))->size & ARRAY_MARK_FLAG)) | |
1900 | { | |
1901 | if (prev) | |
1902 | prev->next = sb->next; | |
1903 | else | |
1904 | large_string_blocks = sb->next; | |
1905 | next = sb->next; | |
1906 | free (sb); | |
1907 | sb = next; | |
1908 | } | |
1909 | else | |
1910 | { | |
1911 | ((struct Lisp_String *)(&sb->chars[0]))->size | |
1912 | &= ~ARRAY_MARK_FLAG & ~MARKBIT; | |
1913 | total_string_size += ((struct Lisp_String *)(&sb->chars[0]))->size; | |
1914 | prev = sb, sb = sb->next; | |
1915 | } | |
1916 | } | |
1917 | } | |
1918 | \f | |
1a4f1e2c | 1919 | /* Compactify strings, relocate references, and free empty string blocks. */ |
7146af97 JB |
1920 | |
1921 | static void | |
1922 | compact_strings () | |
1923 | { | |
1924 | /* String block of old strings we are scanning. */ | |
1925 | register struct string_block *from_sb; | |
1926 | /* A preceding string block (or maybe the same one) | |
1927 | where we are copying the still-live strings to. */ | |
1928 | register struct string_block *to_sb; | |
1929 | int pos; | |
1930 | int to_pos; | |
1931 | ||
1932 | to_sb = first_string_block; | |
1933 | to_pos = 0; | |
1934 | ||
1935 | /* Scan each existing string block sequentially, string by string. */ | |
1936 | for (from_sb = first_string_block; from_sb; from_sb = from_sb->next) | |
1937 | { | |
1938 | pos = 0; | |
1939 | /* POS is the index of the next string in the block. */ | |
1940 | while (pos < from_sb->pos) | |
1941 | { | |
1942 | register struct Lisp_String *nextstr | |
1943 | = (struct Lisp_String *) &from_sb->chars[pos]; | |
1944 | ||
1945 | register struct Lisp_String *newaddr; | |
1946 | register int size = nextstr->size; | |
1947 | ||
1948 | /* NEXTSTR is the old address of the next string. | |
1949 | Just skip it if it isn't marked. */ | |
1950 | if ((unsigned) size > STRING_BLOCK_SIZE) | |
1951 | { | |
1952 | /* It is marked, so its size field is really a chain of refs. | |
1953 | Find the end of the chain, where the actual size lives. */ | |
1954 | while ((unsigned) size > STRING_BLOCK_SIZE) | |
1955 | { | |
1956 | if (size & 1) size ^= MARKBIT | 1; | |
1957 | size = *(int *)size & ~MARKBIT; | |
1958 | } | |
1959 | ||
1960 | total_string_size += size; | |
1961 | ||
1962 | /* If it won't fit in TO_SB, close it out, | |
1963 | and move to the next sb. Keep doing so until | |
1964 | TO_SB reaches a large enough, empty enough string block. | |
1965 | We know that TO_SB cannot advance past FROM_SB here | |
1966 | since FROM_SB is large enough to contain this string. | |
1967 | Any string blocks skipped here | |
1968 | will be patched out and freed later. */ | |
1969 | while (to_pos + STRING_FULLSIZE (size) | |
1970 | > max (to_sb->pos, STRING_BLOCK_SIZE)) | |
1971 | { | |
1972 | to_sb->pos = to_pos; | |
1973 | to_sb = to_sb->next; | |
1974 | to_pos = 0; | |
1975 | } | |
1976 | /* Compute new address of this string | |
1977 | and update TO_POS for the space being used. */ | |
1978 | newaddr = (struct Lisp_String *) &to_sb->chars[to_pos]; | |
1979 | to_pos += STRING_FULLSIZE (size); | |
1980 | ||
1981 | /* Copy the string itself to the new place. */ | |
1982 | if (nextstr != newaddr) | |
d5e35230 JA |
1983 | bcopy (nextstr, newaddr, size + 1 + sizeof (int) |
1984 | + INTERVAL_PTR_SIZE); | |
7146af97 JB |
1985 | |
1986 | /* Go through NEXTSTR's chain of references | |
1987 | and make each slot in the chain point to | |
1988 | the new address of this string. */ | |
1989 | size = newaddr->size; | |
1990 | while ((unsigned) size > STRING_BLOCK_SIZE) | |
1991 | { | |
1992 | register Lisp_Object *objptr; | |
1993 | if (size & 1) size ^= MARKBIT | 1; | |
1994 | objptr = (Lisp_Object *)size; | |
1995 | ||
1996 | size = XFASTINT (*objptr) & ~MARKBIT; | |
1997 | if (XMARKBIT (*objptr)) | |
1998 | { | |
1999 | XSET (*objptr, Lisp_String, newaddr); | |
2000 | XMARK (*objptr); | |
2001 | } | |
2002 | else | |
2003 | XSET (*objptr, Lisp_String, newaddr); | |
2004 | } | |
2005 | /* Store the actual size in the size field. */ | |
2006 | newaddr->size = size; | |
2007 | } | |
2008 | pos += STRING_FULLSIZE (size); | |
2009 | } | |
2010 | } | |
2011 | ||
2012 | /* Close out the last string block still used and free any that follow. */ | |
2013 | to_sb->pos = to_pos; | |
2014 | current_string_block = to_sb; | |
2015 | ||
2016 | from_sb = to_sb->next; | |
2017 | to_sb->next = 0; | |
2018 | while (from_sb) | |
2019 | { | |
2020 | to_sb = from_sb->next; | |
2021 | free (from_sb); | |
2022 | from_sb = to_sb; | |
2023 | } | |
2024 | ||
2025 | /* Free any empty string blocks further back in the chain. | |
2026 | This loop will never free first_string_block, but it is very | |
2027 | unlikely that that one will become empty, so why bother checking? */ | |
2028 | ||
2029 | from_sb = first_string_block; | |
2030 | while (to_sb = from_sb->next) | |
2031 | { | |
2032 | if (to_sb->pos == 0) | |
2033 | { | |
2034 | if (from_sb->next = to_sb->next) | |
2035 | from_sb->next->prev = from_sb; | |
2036 | free (to_sb); | |
2037 | } | |
2038 | else | |
2039 | from_sb = to_sb; | |
2040 | } | |
2041 | } | |
2042 | \f | |
20d24714 JB |
2043 | /* Debugging aids. */ |
2044 | ||
2045 | DEFUN ("memory-limit", Fmemory_limit, Smemory_limit, 0, 0, "", | |
2046 | "Return the address of the last byte Emacs has allocated, divided by 1024.\n\ | |
2047 | This may be helpful in debugging Emacs's memory usage.\n\ | |
e41ae81f | 2048 | We divide the value by 1024 to make sure it fits in a Lisp integer.") |
20d24714 JB |
2049 | () |
2050 | { | |
2051 | Lisp_Object end; | |
2052 | ||
0d73ca81 | 2053 | XSET (end, Lisp_Int, (int) sbrk (0) / 1024); |
20d24714 JB |
2054 | |
2055 | return end; | |
2056 | } | |
2057 | ||
2058 | \f | |
7146af97 JB |
2059 | /* Initialization */ |
2060 | ||
2061 | init_alloc_once () | |
2062 | { | |
2063 | /* Used to do Vpurify_flag = Qt here, but Qt isn't set up yet! */ | |
2064 | pureptr = 0; | |
4c0be5f4 JB |
2065 | #ifdef HAVE_SHM |
2066 | pure_size = PURESIZE; | |
2067 | #endif | |
7146af97 JB |
2068 | all_vectors = 0; |
2069 | ignore_warnings = 1; | |
2070 | init_strings (); | |
2071 | init_cons (); | |
2072 | init_symbol (); | |
2073 | init_marker (); | |
2074 | #ifdef LISP_FLOAT_TYPE | |
2075 | init_float (); | |
2076 | #endif /* LISP_FLOAT_TYPE */ | |
d5e35230 JA |
2077 | INIT_INTERVALS; |
2078 | ||
7146af97 JB |
2079 | ignore_warnings = 0; |
2080 | gcprolist = 0; | |
2081 | staticidx = 0; | |
2082 | consing_since_gc = 0; | |
2083 | gc_cons_threshold = 100000; | |
2084 | #ifdef VIRT_ADDR_VARIES | |
2085 | malloc_sbrk_unused = 1<<22; /* A large number */ | |
2086 | malloc_sbrk_used = 100000; /* as reasonable as any number */ | |
2087 | #endif /* VIRT_ADDR_VARIES */ | |
2088 | } | |
2089 | ||
2090 | init_alloc () | |
2091 | { | |
2092 | gcprolist = 0; | |
2093 | } | |
2094 | ||
2095 | void | |
2096 | syms_of_alloc () | |
2097 | { | |
2098 | DEFVAR_INT ("gc-cons-threshold", &gc_cons_threshold, | |
2099 | "*Number of bytes of consing between garbage collections.\n\ | |
2100 | Garbage collection can happen automatically once this many bytes have been\n\ | |
2101 | allocated since the last garbage collection. All data types count.\n\n\ | |
2102 | Garbage collection happens automatically only when `eval' is called.\n\n\ | |
2103 | By binding this temporarily to a large number, you can effectively\n\ | |
2104 | prevent garbage collection during a part of the program."); | |
2105 | ||
2106 | DEFVAR_INT ("pure-bytes-used", &pureptr, | |
2107 | "Number of bytes of sharable Lisp data allocated so far."); | |
2108 | ||
2109 | #if 0 | |
2110 | DEFVAR_INT ("data-bytes-used", &malloc_sbrk_used, | |
2111 | "Number of bytes of unshared memory allocated in this session."); | |
2112 | ||
2113 | DEFVAR_INT ("data-bytes-free", &malloc_sbrk_unused, | |
2114 | "Number of bytes of unshared memory remaining available in this session."); | |
2115 | #endif | |
2116 | ||
2117 | DEFVAR_LISP ("purify-flag", &Vpurify_flag, | |
2118 | "Non-nil means loading Lisp code in order to dump an executable.\n\ | |
2119 | This means that certain objects should be allocated in shared (pure) space."); | |
2120 | ||
502b9b64 | 2121 | DEFVAR_INT ("undo-limit", &undo_limit, |
7146af97 | 2122 | "Keep no more undo information once it exceeds this size.\n\ |
502b9b64 | 2123 | This limit is applied when garbage collection happens.\n\ |
7146af97 JB |
2124 | The size is counted as the number of bytes occupied,\n\ |
2125 | which includes both saved text and other data."); | |
502b9b64 | 2126 | undo_limit = 20000; |
7146af97 | 2127 | |
502b9b64 | 2128 | DEFVAR_INT ("undo-strong-limit", &undo_strong_limit, |
7146af97 JB |
2129 | "Don't keep more than this much size of undo information.\n\ |
2130 | A command which pushes past this size is itself forgotten.\n\ | |
502b9b64 | 2131 | This limit is applied when garbage collection happens.\n\ |
7146af97 JB |
2132 | The size is counted as the number of bytes occupied,\n\ |
2133 | which includes both saved text and other data."); | |
502b9b64 | 2134 | undo_strong_limit = 30000; |
7146af97 JB |
2135 | |
2136 | defsubr (&Scons); | |
2137 | defsubr (&Slist); | |
2138 | defsubr (&Svector); | |
2139 | defsubr (&Smake_byte_code); | |
2140 | defsubr (&Smake_list); | |
2141 | defsubr (&Smake_vector); | |
2142 | defsubr (&Smake_string); | |
2143 | defsubr (&Smake_rope); | |
2144 | defsubr (&Srope_elt); | |
2145 | defsubr (&Smake_symbol); | |
2146 | defsubr (&Smake_marker); | |
2147 | defsubr (&Spurecopy); | |
2148 | defsubr (&Sgarbage_collect); | |
20d24714 | 2149 | defsubr (&Smemory_limit); |
7146af97 | 2150 | } |