| 1 | /* Storage allocation and gc for GNU Emacs Lisp interpreter. |
| 2 | Copyright (C) 1985, 86, 88, 93, 94, 95 Free Software Foundation, Inc. |
| 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 |
| 8 | the Free Software Foundation; either version 2, or (at your option) |
| 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 | #include <signal.h> |
| 21 | |
| 22 | #include <config.h> |
| 23 | #include "lisp.h" |
| 24 | #include "intervals.h" |
| 25 | #include "puresize.h" |
| 26 | #ifndef standalone |
| 27 | #include "buffer.h" |
| 28 | #include "window.h" |
| 29 | #include "frame.h" |
| 30 | #include "blockinput.h" |
| 31 | #include "keyboard.h" |
| 32 | #endif |
| 33 | |
| 34 | #include "syssignal.h" |
| 35 | |
| 36 | extern char *sbrk (); |
| 37 | |
| 38 | /* The following come from gmalloc.c. */ |
| 39 | |
| 40 | #if defined (__STDC__) && __STDC__ |
| 41 | #include <stddef.h> |
| 42 | #define __malloc_size_t size_t |
| 43 | #else |
| 44 | #define __malloc_size_t unsigned int |
| 45 | #endif |
| 46 | extern __malloc_size_t _bytes_used; |
| 47 | extern int __malloc_extra_blocks; |
| 48 | |
| 49 | #define max(A,B) ((A) > (B) ? (A) : (B)) |
| 50 | #define min(A,B) ((A) < (B) ? (A) : (B)) |
| 51 | |
| 52 | /* Macro to verify that storage intended for Lisp objects is not |
| 53 | out of range to fit in the space for a pointer. |
| 54 | ADDRESS is the start of the block, and SIZE |
| 55 | is the amount of space within which objects can start. */ |
| 56 | #define VALIDATE_LISP_STORAGE(address, size) \ |
| 57 | do \ |
| 58 | { \ |
| 59 | Lisp_Object val; \ |
| 60 | XSETCONS (val, (char *) address + size); \ |
| 61 | if ((char *) XCONS (val) != (char *) address + size) \ |
| 62 | { \ |
| 63 | xfree (address); \ |
| 64 | memory_full (); \ |
| 65 | } \ |
| 66 | } while (0) |
| 67 | |
| 68 | /* Value of _bytes_used, when spare_memory was freed. */ |
| 69 | static __malloc_size_t bytes_used_when_full; |
| 70 | |
| 71 | /* Number of bytes of consing done since the last gc */ |
| 72 | int consing_since_gc; |
| 73 | |
| 74 | /* Number of bytes of consing since gc before another gc should be done. */ |
| 75 | int gc_cons_threshold; |
| 76 | |
| 77 | /* Nonzero during gc */ |
| 78 | int gc_in_progress; |
| 79 | |
| 80 | #ifndef VIRT_ADDR_VARIES |
| 81 | extern |
| 82 | #endif /* VIRT_ADDR_VARIES */ |
| 83 | int malloc_sbrk_used; |
| 84 | |
| 85 | #ifndef VIRT_ADDR_VARIES |
| 86 | extern |
| 87 | #endif /* VIRT_ADDR_VARIES */ |
| 88 | int malloc_sbrk_unused; |
| 89 | |
| 90 | /* Two limits controlling how much undo information to keep. */ |
| 91 | int undo_limit; |
| 92 | int undo_strong_limit; |
| 93 | |
| 94 | /* Points to memory space allocated as "spare", |
| 95 | to be freed if we run out of memory. */ |
| 96 | static char *spare_memory; |
| 97 | |
| 98 | /* Amount of spare memory to keep in reserve. */ |
| 99 | #define SPARE_MEMORY (1 << 14) |
| 100 | |
| 101 | /* Number of extra blocks malloc should get when it needs more core. */ |
| 102 | static int malloc_hysteresis; |
| 103 | |
| 104 | /* Non-nil means defun should do purecopy on the function definition */ |
| 105 | Lisp_Object Vpurify_flag; |
| 106 | |
| 107 | #ifndef HAVE_SHM |
| 108 | EMACS_INT pure[PURESIZE / sizeof (EMACS_INT)] = {0,}; /* Force it into data space! */ |
| 109 | #define PUREBEG (char *) pure |
| 110 | #else |
| 111 | #define pure PURE_SEG_BITS /* Use shared memory segment */ |
| 112 | #define PUREBEG (char *)PURE_SEG_BITS |
| 113 | |
| 114 | /* This variable is used only by the XPNTR macro when HAVE_SHM is |
| 115 | defined. If we used the PURESIZE macro directly there, that would |
| 116 | make most of emacs dependent on puresize.h, which we don't want - |
| 117 | you should be able to change that without too much recompilation. |
| 118 | So map_in_data initializes pure_size, and the dependencies work |
| 119 | out. */ |
| 120 | EMACS_INT pure_size; |
| 121 | #endif /* not HAVE_SHM */ |
| 122 | |
| 123 | /* Index in pure at which next pure object will be allocated. */ |
| 124 | int pureptr; |
| 125 | |
| 126 | /* If nonzero, this is a warning delivered by malloc and not yet displayed. */ |
| 127 | char *pending_malloc_warning; |
| 128 | |
| 129 | /* Pre-computed signal argument for use when memory is exhausted. */ |
| 130 | Lisp_Object memory_signal_data; |
| 131 | |
| 132 | /* Maximum amount of C stack to save when a GC happens. */ |
| 133 | |
| 134 | #ifndef MAX_SAVE_STACK |
| 135 | #define MAX_SAVE_STACK 16000 |
| 136 | #endif |
| 137 | |
| 138 | /* Define DONT_COPY_FLAG to be some bit which will always be zero in a |
| 139 | pointer to a Lisp_Object, when that pointer is viewed as an integer. |
| 140 | (On most machines, pointers are even, so we can use the low bit. |
| 141 | Word-addressible architectures may need to override this in the m-file.) |
| 142 | When linking references to small strings through the size field, we |
| 143 | use this slot to hold the bit that would otherwise be interpreted as |
| 144 | the GC mark bit. */ |
| 145 | #ifndef DONT_COPY_FLAG |
| 146 | #define DONT_COPY_FLAG 1 |
| 147 | #endif /* no DONT_COPY_FLAG */ |
| 148 | |
| 149 | /* Buffer in which we save a copy of the C stack at each GC. */ |
| 150 | |
| 151 | char *stack_copy; |
| 152 | int stack_copy_size; |
| 153 | |
| 154 | /* Non-zero means ignore malloc warnings. Set during initialization. */ |
| 155 | int ignore_warnings; |
| 156 | |
| 157 | Lisp_Object Qgc_cons_threshold; |
| 158 | |
| 159 | static void mark_object (), mark_buffer (), mark_kboards (); |
| 160 | static void clear_marks (), gc_sweep (); |
| 161 | static void compact_strings (); |
| 162 | \f |
| 163 | /* Versions of malloc and realloc that print warnings as memory gets full. */ |
| 164 | |
| 165 | Lisp_Object |
| 166 | malloc_warning_1 (str) |
| 167 | Lisp_Object str; |
| 168 | { |
| 169 | Fprinc (str, Vstandard_output); |
| 170 | write_string ("\nKilling some buffers may delay running out of memory.\n", -1); |
| 171 | write_string ("However, certainly by the time you receive the 95% warning,\n", -1); |
| 172 | write_string ("you should clean up, kill this Emacs, and start a new one.", -1); |
| 173 | return Qnil; |
| 174 | } |
| 175 | |
| 176 | /* malloc calls this if it finds we are near exhausting storage */ |
| 177 | malloc_warning (str) |
| 178 | char *str; |
| 179 | { |
| 180 | pending_malloc_warning = str; |
| 181 | } |
| 182 | |
| 183 | display_malloc_warning () |
| 184 | { |
| 185 | register Lisp_Object val; |
| 186 | |
| 187 | val = build_string (pending_malloc_warning); |
| 188 | pending_malloc_warning = 0; |
| 189 | internal_with_output_to_temp_buffer (" *Danger*", malloc_warning_1, val); |
| 190 | } |
| 191 | |
| 192 | /* Called if malloc returns zero */ |
| 193 | |
| 194 | memory_full () |
| 195 | { |
| 196 | #ifndef SYSTEM_MALLOC |
| 197 | bytes_used_when_full = _bytes_used; |
| 198 | #endif |
| 199 | |
| 200 | /* The first time we get here, free the spare memory. */ |
| 201 | if (spare_memory) |
| 202 | { |
| 203 | free (spare_memory); |
| 204 | spare_memory = 0; |
| 205 | } |
| 206 | |
| 207 | /* This used to call error, but if we've run out of memory, we could get |
| 208 | infinite recursion trying to build the string. */ |
| 209 | while (1) |
| 210 | Fsignal (Qerror, memory_signal_data); |
| 211 | } |
| 212 | |
| 213 | /* Called if we can't allocate relocatable space for a buffer. */ |
| 214 | |
| 215 | void |
| 216 | buffer_memory_full () |
| 217 | { |
| 218 | /* If buffers use the relocating allocator, |
| 219 | no need to free spare_memory, because we may have plenty of malloc |
| 220 | space left that we could get, and if we don't, the malloc that fails |
| 221 | will itself cause spare_memory to be freed. |
| 222 | If buffers don't use the relocating allocator, |
| 223 | treat this like any other failing malloc. */ |
| 224 | |
| 225 | #ifndef REL_ALLOC |
| 226 | memory_full (); |
| 227 | #endif |
| 228 | |
| 229 | /* This used to call error, but if we've run out of memory, we could get |
| 230 | infinite recursion trying to build the string. */ |
| 231 | while (1) |
| 232 | Fsignal (Qerror, memory_signal_data); |
| 233 | } |
| 234 | |
| 235 | /* like malloc routines but check for no memory and block interrupt input. */ |
| 236 | |
| 237 | long * |
| 238 | xmalloc (size) |
| 239 | int size; |
| 240 | { |
| 241 | register long *val; |
| 242 | |
| 243 | BLOCK_INPUT; |
| 244 | val = (long *) malloc (size); |
| 245 | UNBLOCK_INPUT; |
| 246 | |
| 247 | if (!val && size) memory_full (); |
| 248 | return val; |
| 249 | } |
| 250 | |
| 251 | long * |
| 252 | xrealloc (block, size) |
| 253 | long *block; |
| 254 | int size; |
| 255 | { |
| 256 | register long *val; |
| 257 | |
| 258 | BLOCK_INPUT; |
| 259 | /* We must call malloc explicitly when BLOCK is 0, since some |
| 260 | reallocs don't do this. */ |
| 261 | if (! block) |
| 262 | val = (long *) malloc (size); |
| 263 | else |
| 264 | val = (long *) realloc (block, size); |
| 265 | UNBLOCK_INPUT; |
| 266 | |
| 267 | if (!val && size) memory_full (); |
| 268 | return val; |
| 269 | } |
| 270 | |
| 271 | void |
| 272 | xfree (block) |
| 273 | long *block; |
| 274 | { |
| 275 | BLOCK_INPUT; |
| 276 | free (block); |
| 277 | UNBLOCK_INPUT; |
| 278 | } |
| 279 | |
| 280 | \f |
| 281 | /* Arranging to disable input signals while we're in malloc. |
| 282 | |
| 283 | This only works with GNU malloc. To help out systems which can't |
| 284 | use GNU malloc, all the calls to malloc, realloc, and free |
| 285 | elsewhere in the code should be inside a BLOCK_INPUT/UNBLOCK_INPUT |
| 286 | pairs; unfortunately, we have no idea what C library functions |
| 287 | might call malloc, so we can't really protect them unless you're |
| 288 | using GNU malloc. Fortunately, most of the major operating can use |
| 289 | GNU malloc. */ |
| 290 | |
| 291 | #ifndef SYSTEM_MALLOC |
| 292 | extern void * (*__malloc_hook) (); |
| 293 | static void * (*old_malloc_hook) (); |
| 294 | extern void * (*__realloc_hook) (); |
| 295 | static void * (*old_realloc_hook) (); |
| 296 | extern void (*__free_hook) (); |
| 297 | static void (*old_free_hook) (); |
| 298 | |
| 299 | /* This function is used as the hook for free to call. */ |
| 300 | |
| 301 | static void |
| 302 | emacs_blocked_free (ptr) |
| 303 | void *ptr; |
| 304 | { |
| 305 | BLOCK_INPUT; |
| 306 | __free_hook = old_free_hook; |
| 307 | free (ptr); |
| 308 | /* If we released our reserve (due to running out of memory), |
| 309 | and we have a fair amount free once again, |
| 310 | try to set aside another reserve in case we run out once more. */ |
| 311 | if (spare_memory == 0 |
| 312 | /* Verify there is enough space that even with the malloc |
| 313 | hysteresis this call won't run out again. |
| 314 | The code here is correct as long as SPARE_MEMORY |
| 315 | is substantially larger than the block size malloc uses. */ |
| 316 | && (bytes_used_when_full |
| 317 | > _bytes_used + max (malloc_hysteresis, 4) * SPARE_MEMORY)) |
| 318 | spare_memory = (char *) malloc (SPARE_MEMORY); |
| 319 | |
| 320 | __free_hook = emacs_blocked_free; |
| 321 | UNBLOCK_INPUT; |
| 322 | } |
| 323 | |
| 324 | /* If we released our reserve (due to running out of memory), |
| 325 | and we have a fair amount free once again, |
| 326 | try to set aside another reserve in case we run out once more. |
| 327 | |
| 328 | This is called when a relocatable block is freed in ralloc.c. */ |
| 329 | |
| 330 | void |
| 331 | refill_memory_reserve () |
| 332 | { |
| 333 | if (spare_memory == 0) |
| 334 | spare_memory = (char *) malloc (SPARE_MEMORY); |
| 335 | } |
| 336 | |
| 337 | /* This function is the malloc hook that Emacs uses. */ |
| 338 | |
| 339 | static void * |
| 340 | emacs_blocked_malloc (size) |
| 341 | unsigned size; |
| 342 | { |
| 343 | void *value; |
| 344 | |
| 345 | BLOCK_INPUT; |
| 346 | __malloc_hook = old_malloc_hook; |
| 347 | __malloc_extra_blocks = malloc_hysteresis; |
| 348 | value = (void *) malloc (size); |
| 349 | __malloc_hook = emacs_blocked_malloc; |
| 350 | UNBLOCK_INPUT; |
| 351 | |
| 352 | return value; |
| 353 | } |
| 354 | |
| 355 | static void * |
| 356 | emacs_blocked_realloc (ptr, size) |
| 357 | void *ptr; |
| 358 | unsigned size; |
| 359 | { |
| 360 | void *value; |
| 361 | |
| 362 | BLOCK_INPUT; |
| 363 | __realloc_hook = old_realloc_hook; |
| 364 | value = (void *) realloc (ptr, size); |
| 365 | __realloc_hook = emacs_blocked_realloc; |
| 366 | UNBLOCK_INPUT; |
| 367 | |
| 368 | return value; |
| 369 | } |
| 370 | |
| 371 | void |
| 372 | uninterrupt_malloc () |
| 373 | { |
| 374 | old_free_hook = __free_hook; |
| 375 | __free_hook = emacs_blocked_free; |
| 376 | |
| 377 | old_malloc_hook = __malloc_hook; |
| 378 | __malloc_hook = emacs_blocked_malloc; |
| 379 | |
| 380 | old_realloc_hook = __realloc_hook; |
| 381 | __realloc_hook = emacs_blocked_realloc; |
| 382 | } |
| 383 | #endif |
| 384 | \f |
| 385 | /* Interval allocation. */ |
| 386 | |
| 387 | #ifdef USE_TEXT_PROPERTIES |
| 388 | #define INTERVAL_BLOCK_SIZE \ |
| 389 | ((1020 - sizeof (struct interval_block *)) / sizeof (struct interval)) |
| 390 | |
| 391 | struct interval_block |
| 392 | { |
| 393 | struct interval_block *next; |
| 394 | struct interval intervals[INTERVAL_BLOCK_SIZE]; |
| 395 | }; |
| 396 | |
| 397 | struct interval_block *interval_block; |
| 398 | static int interval_block_index; |
| 399 | |
| 400 | INTERVAL interval_free_list; |
| 401 | |
| 402 | static void |
| 403 | init_intervals () |
| 404 | { |
| 405 | interval_block |
| 406 | = (struct interval_block *) malloc (sizeof (struct interval_block)); |
| 407 | interval_block->next = 0; |
| 408 | bzero (interval_block->intervals, sizeof interval_block->intervals); |
| 409 | interval_block_index = 0; |
| 410 | interval_free_list = 0; |
| 411 | } |
| 412 | |
| 413 | #define INIT_INTERVALS init_intervals () |
| 414 | |
| 415 | INTERVAL |
| 416 | make_interval () |
| 417 | { |
| 418 | INTERVAL val; |
| 419 | |
| 420 | if (interval_free_list) |
| 421 | { |
| 422 | val = interval_free_list; |
| 423 | interval_free_list = interval_free_list->parent; |
| 424 | } |
| 425 | else |
| 426 | { |
| 427 | if (interval_block_index == INTERVAL_BLOCK_SIZE) |
| 428 | { |
| 429 | register struct interval_block *newi |
| 430 | = (struct interval_block *) xmalloc (sizeof (struct interval_block)); |
| 431 | |
| 432 | VALIDATE_LISP_STORAGE (newi, sizeof *newi); |
| 433 | newi->next = interval_block; |
| 434 | interval_block = newi; |
| 435 | interval_block_index = 0; |
| 436 | } |
| 437 | val = &interval_block->intervals[interval_block_index++]; |
| 438 | } |
| 439 | consing_since_gc += sizeof (struct interval); |
| 440 | RESET_INTERVAL (val); |
| 441 | return val; |
| 442 | } |
| 443 | |
| 444 | static int total_free_intervals, total_intervals; |
| 445 | |
| 446 | /* Mark the pointers of one interval. */ |
| 447 | |
| 448 | static void |
| 449 | mark_interval (i, dummy) |
| 450 | register INTERVAL i; |
| 451 | Lisp_Object dummy; |
| 452 | { |
| 453 | if (XMARKBIT (i->plist)) |
| 454 | abort (); |
| 455 | mark_object (&i->plist); |
| 456 | XMARK (i->plist); |
| 457 | } |
| 458 | |
| 459 | static void |
| 460 | mark_interval_tree (tree) |
| 461 | register INTERVAL tree; |
| 462 | { |
| 463 | /* No need to test if this tree has been marked already; this |
| 464 | function is always called through the MARK_INTERVAL_TREE macro, |
| 465 | which takes care of that. */ |
| 466 | |
| 467 | /* XMARK expands to an assignment; the LHS of an assignment can't be |
| 468 | a cast. */ |
| 469 | XMARK (* (Lisp_Object *) &tree->parent); |
| 470 | |
| 471 | traverse_intervals (tree, 1, 0, mark_interval, Qnil); |
| 472 | } |
| 473 | |
| 474 | #define MARK_INTERVAL_TREE(i) \ |
| 475 | do { \ |
| 476 | if (!NULL_INTERVAL_P (i) \ |
| 477 | && ! XMARKBIT ((Lisp_Object) i->parent)) \ |
| 478 | mark_interval_tree (i); \ |
| 479 | } while (0) |
| 480 | |
| 481 | /* The oddity in the call to XUNMARK is necessary because XUNMARK |
| 482 | expands to an assignment to its argument, and most C compilers don't |
| 483 | support casts on the left operand of `='. */ |
| 484 | #define UNMARK_BALANCE_INTERVALS(i) \ |
| 485 | { \ |
| 486 | if (! NULL_INTERVAL_P (i)) \ |
| 487 | { \ |
| 488 | XUNMARK (* (Lisp_Object *) (&(i)->parent)); \ |
| 489 | (i) = balance_intervals (i); \ |
| 490 | } \ |
| 491 | } |
| 492 | |
| 493 | #else /* no interval use */ |
| 494 | |
| 495 | #define INIT_INTERVALS |
| 496 | |
| 497 | #define UNMARK_BALANCE_INTERVALS(i) |
| 498 | #define MARK_INTERVAL_TREE(i) |
| 499 | |
| 500 | #endif /* no interval use */ |
| 501 | \f |
| 502 | /* Floating point allocation. */ |
| 503 | |
| 504 | #ifdef LISP_FLOAT_TYPE |
| 505 | /* Allocation of float cells, just like conses */ |
| 506 | /* We store float cells inside of float_blocks, allocating a new |
| 507 | float_block with malloc whenever necessary. Float cells reclaimed by |
| 508 | GC are put on a free list to be reallocated before allocating |
| 509 | any new float cells from the latest float_block. |
| 510 | |
| 511 | Each float_block is just under 1020 bytes long, |
| 512 | since malloc really allocates in units of powers of two |
| 513 | and uses 4 bytes for its own overhead. */ |
| 514 | |
| 515 | #define FLOAT_BLOCK_SIZE \ |
| 516 | ((1020 - sizeof (struct float_block *)) / sizeof (struct Lisp_Float)) |
| 517 | |
| 518 | struct float_block |
| 519 | { |
| 520 | struct float_block *next; |
| 521 | struct Lisp_Float floats[FLOAT_BLOCK_SIZE]; |
| 522 | }; |
| 523 | |
| 524 | struct float_block *float_block; |
| 525 | int float_block_index; |
| 526 | |
| 527 | struct Lisp_Float *float_free_list; |
| 528 | |
| 529 | void |
| 530 | init_float () |
| 531 | { |
| 532 | float_block = (struct float_block *) malloc (sizeof (struct float_block)); |
| 533 | float_block->next = 0; |
| 534 | bzero (float_block->floats, sizeof float_block->floats); |
| 535 | float_block_index = 0; |
| 536 | float_free_list = 0; |
| 537 | } |
| 538 | |
| 539 | /* Explicitly free a float cell. */ |
| 540 | free_float (ptr) |
| 541 | struct Lisp_Float *ptr; |
| 542 | { |
| 543 | *(struct Lisp_Float **)&ptr->type = float_free_list; |
| 544 | float_free_list = ptr; |
| 545 | } |
| 546 | |
| 547 | Lisp_Object |
| 548 | make_float (float_value) |
| 549 | double float_value; |
| 550 | { |
| 551 | register Lisp_Object val; |
| 552 | |
| 553 | if (float_free_list) |
| 554 | { |
| 555 | XSETFLOAT (val, float_free_list); |
| 556 | float_free_list = *(struct Lisp_Float **)&float_free_list->type; |
| 557 | } |
| 558 | else |
| 559 | { |
| 560 | if (float_block_index == FLOAT_BLOCK_SIZE) |
| 561 | { |
| 562 | register struct float_block *new = (struct float_block *) xmalloc (sizeof (struct float_block)); |
| 563 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
| 564 | new->next = float_block; |
| 565 | float_block = new; |
| 566 | float_block_index = 0; |
| 567 | } |
| 568 | XSETFLOAT (val, &float_block->floats[float_block_index++]); |
| 569 | } |
| 570 | XFLOAT (val)->data = float_value; |
| 571 | XSETFASTINT (XFLOAT (val)->type, 0); /* bug chasing -wsr */ |
| 572 | consing_since_gc += sizeof (struct Lisp_Float); |
| 573 | return val; |
| 574 | } |
| 575 | |
| 576 | #endif /* LISP_FLOAT_TYPE */ |
| 577 | \f |
| 578 | /* Allocation of cons cells */ |
| 579 | /* We store cons cells inside of cons_blocks, allocating a new |
| 580 | cons_block with malloc whenever necessary. Cons cells reclaimed by |
| 581 | GC are put on a free list to be reallocated before allocating |
| 582 | any new cons cells from the latest cons_block. |
| 583 | |
| 584 | Each cons_block is just under 1020 bytes long, |
| 585 | since malloc really allocates in units of powers of two |
| 586 | and uses 4 bytes for its own overhead. */ |
| 587 | |
| 588 | #define CONS_BLOCK_SIZE \ |
| 589 | ((1020 - sizeof (struct cons_block *)) / sizeof (struct Lisp_Cons)) |
| 590 | |
| 591 | struct cons_block |
| 592 | { |
| 593 | struct cons_block *next; |
| 594 | struct Lisp_Cons conses[CONS_BLOCK_SIZE]; |
| 595 | }; |
| 596 | |
| 597 | struct cons_block *cons_block; |
| 598 | int cons_block_index; |
| 599 | |
| 600 | struct Lisp_Cons *cons_free_list; |
| 601 | |
| 602 | void |
| 603 | init_cons () |
| 604 | { |
| 605 | cons_block = (struct cons_block *) malloc (sizeof (struct cons_block)); |
| 606 | cons_block->next = 0; |
| 607 | bzero (cons_block->conses, sizeof cons_block->conses); |
| 608 | cons_block_index = 0; |
| 609 | cons_free_list = 0; |
| 610 | } |
| 611 | |
| 612 | /* Explicitly free a cons cell. */ |
| 613 | free_cons (ptr) |
| 614 | struct Lisp_Cons *ptr; |
| 615 | { |
| 616 | *(struct Lisp_Cons **)&ptr->car = cons_free_list; |
| 617 | cons_free_list = ptr; |
| 618 | } |
| 619 | |
| 620 | DEFUN ("cons", Fcons, Scons, 2, 2, 0, |
| 621 | "Create a new cons, give it CAR and CDR as components, and return it.") |
| 622 | (car, cdr) |
| 623 | Lisp_Object car, cdr; |
| 624 | { |
| 625 | register Lisp_Object val; |
| 626 | |
| 627 | if (cons_free_list) |
| 628 | { |
| 629 | XSETCONS (val, cons_free_list); |
| 630 | cons_free_list = *(struct Lisp_Cons **)&cons_free_list->car; |
| 631 | } |
| 632 | else |
| 633 | { |
| 634 | if (cons_block_index == CONS_BLOCK_SIZE) |
| 635 | { |
| 636 | register struct cons_block *new = (struct cons_block *) xmalloc (sizeof (struct cons_block)); |
| 637 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
| 638 | new->next = cons_block; |
| 639 | cons_block = new; |
| 640 | cons_block_index = 0; |
| 641 | } |
| 642 | XSETCONS (val, &cons_block->conses[cons_block_index++]); |
| 643 | } |
| 644 | XCONS (val)->car = car; |
| 645 | XCONS (val)->cdr = cdr; |
| 646 | consing_since_gc += sizeof (struct Lisp_Cons); |
| 647 | return val; |
| 648 | } |
| 649 | |
| 650 | DEFUN ("list", Flist, Slist, 0, MANY, 0, |
| 651 | "Return a newly created list with specified arguments as elements.\n\ |
| 652 | Any number of arguments, even zero arguments, are allowed.") |
| 653 | (nargs, args) |
| 654 | int nargs; |
| 655 | register Lisp_Object *args; |
| 656 | { |
| 657 | register Lisp_Object len, val, val_tail; |
| 658 | |
| 659 | XSETFASTINT (len, nargs); |
| 660 | val = Fmake_list (len, Qnil); |
| 661 | val_tail = val; |
| 662 | while (!NILP (val_tail)) |
| 663 | { |
| 664 | XCONS (val_tail)->car = *args++; |
| 665 | val_tail = XCONS (val_tail)->cdr; |
| 666 | } |
| 667 | return val; |
| 668 | } |
| 669 | |
| 670 | DEFUN ("make-list", Fmake_list, Smake_list, 2, 2, 0, |
| 671 | "Return a newly created list of length LENGTH, with each element being INIT.") |
| 672 | (length, init) |
| 673 | register Lisp_Object length, init; |
| 674 | { |
| 675 | register Lisp_Object val; |
| 676 | register int size; |
| 677 | |
| 678 | CHECK_NATNUM (length, 0); |
| 679 | size = XFASTINT (length); |
| 680 | |
| 681 | val = Qnil; |
| 682 | while (size-- > 0) |
| 683 | val = Fcons (init, val); |
| 684 | return val; |
| 685 | } |
| 686 | \f |
| 687 | /* Allocation of vectors */ |
| 688 | |
| 689 | struct Lisp_Vector *all_vectors; |
| 690 | |
| 691 | struct Lisp_Vector * |
| 692 | allocate_vectorlike (len) |
| 693 | EMACS_INT len; |
| 694 | { |
| 695 | struct Lisp_Vector *p; |
| 696 | |
| 697 | p = (struct Lisp_Vector *)xmalloc (sizeof (struct Lisp_Vector) |
| 698 | + (len - 1) * sizeof (Lisp_Object)); |
| 699 | VALIDATE_LISP_STORAGE (p, 0); |
| 700 | consing_since_gc += (sizeof (struct Lisp_Vector) |
| 701 | + (len - 1) * sizeof (Lisp_Object)); |
| 702 | |
| 703 | p->next = all_vectors; |
| 704 | all_vectors = p; |
| 705 | return p; |
| 706 | } |
| 707 | |
| 708 | DEFUN ("make-vector", Fmake_vector, Smake_vector, 2, 2, 0, |
| 709 | "Return a newly created vector of length LENGTH, with each element being INIT.\n\ |
| 710 | See also the function `vector'.") |
| 711 | (length, init) |
| 712 | register Lisp_Object length, init; |
| 713 | { |
| 714 | Lisp_Object vector; |
| 715 | register EMACS_INT sizei; |
| 716 | register int index; |
| 717 | register struct Lisp_Vector *p; |
| 718 | |
| 719 | CHECK_NATNUM (length, 0); |
| 720 | sizei = XFASTINT (length); |
| 721 | |
| 722 | p = allocate_vectorlike (sizei); |
| 723 | p->size = sizei; |
| 724 | for (index = 0; index < sizei; index++) |
| 725 | p->contents[index] = init; |
| 726 | |
| 727 | XSETVECTOR (vector, p); |
| 728 | return vector; |
| 729 | } |
| 730 | |
| 731 | DEFUN ("vector", Fvector, Svector, 0, MANY, 0, |
| 732 | "Return a newly created vector with specified arguments as elements.\n\ |
| 733 | Any number of arguments, even zero arguments, are allowed.") |
| 734 | (nargs, args) |
| 735 | register int nargs; |
| 736 | Lisp_Object *args; |
| 737 | { |
| 738 | register Lisp_Object len, val; |
| 739 | register int index; |
| 740 | register struct Lisp_Vector *p; |
| 741 | |
| 742 | XSETFASTINT (len, nargs); |
| 743 | val = Fmake_vector (len, Qnil); |
| 744 | p = XVECTOR (val); |
| 745 | for (index = 0; index < nargs; index++) |
| 746 | p->contents[index] = args[index]; |
| 747 | return val; |
| 748 | } |
| 749 | |
| 750 | DEFUN ("make-byte-code", Fmake_byte_code, Smake_byte_code, 4, MANY, 0, |
| 751 | "Create a byte-code object with specified arguments as elements.\n\ |
| 752 | The arguments should be the arglist, bytecode-string, constant vector,\n\ |
| 753 | stack size, (optional) doc string, and (optional) interactive spec.\n\ |
| 754 | The first four arguments are required; at most six have any\n\ |
| 755 | significance.") |
| 756 | (nargs, args) |
| 757 | register int nargs; |
| 758 | Lisp_Object *args; |
| 759 | { |
| 760 | register Lisp_Object len, val; |
| 761 | register int index; |
| 762 | register struct Lisp_Vector *p; |
| 763 | |
| 764 | XSETFASTINT (len, nargs); |
| 765 | if (!NILP (Vpurify_flag)) |
| 766 | val = make_pure_vector (len); |
| 767 | else |
| 768 | val = Fmake_vector (len, Qnil); |
| 769 | p = XVECTOR (val); |
| 770 | for (index = 0; index < nargs; index++) |
| 771 | { |
| 772 | if (!NILP (Vpurify_flag)) |
| 773 | args[index] = Fpurecopy (args[index]); |
| 774 | p->contents[index] = args[index]; |
| 775 | } |
| 776 | XSETCOMPILED (val, val); |
| 777 | return val; |
| 778 | } |
| 779 | \f |
| 780 | /* Allocation of symbols. |
| 781 | Just like allocation of conses! |
| 782 | |
| 783 | Each symbol_block is just under 1020 bytes long, |
| 784 | since malloc really allocates in units of powers of two |
| 785 | and uses 4 bytes for its own overhead. */ |
| 786 | |
| 787 | #define SYMBOL_BLOCK_SIZE \ |
| 788 | ((1020 - sizeof (struct symbol_block *)) / sizeof (struct Lisp_Symbol)) |
| 789 | |
| 790 | struct symbol_block |
| 791 | { |
| 792 | struct symbol_block *next; |
| 793 | struct Lisp_Symbol symbols[SYMBOL_BLOCK_SIZE]; |
| 794 | }; |
| 795 | |
| 796 | struct symbol_block *symbol_block; |
| 797 | int symbol_block_index; |
| 798 | |
| 799 | struct Lisp_Symbol *symbol_free_list; |
| 800 | |
| 801 | void |
| 802 | init_symbol () |
| 803 | { |
| 804 | symbol_block = (struct symbol_block *) malloc (sizeof (struct symbol_block)); |
| 805 | symbol_block->next = 0; |
| 806 | bzero (symbol_block->symbols, sizeof symbol_block->symbols); |
| 807 | symbol_block_index = 0; |
| 808 | symbol_free_list = 0; |
| 809 | } |
| 810 | |
| 811 | DEFUN ("make-symbol", Fmake_symbol, Smake_symbol, 1, 1, 0, |
| 812 | "Return a newly allocated uninterned symbol whose name is NAME.\n\ |
| 813 | Its value and function definition are void, and its property list is nil.") |
| 814 | (str) |
| 815 | Lisp_Object str; |
| 816 | { |
| 817 | register Lisp_Object val; |
| 818 | register struct Lisp_Symbol *p; |
| 819 | |
| 820 | CHECK_STRING (str, 0); |
| 821 | |
| 822 | if (symbol_free_list) |
| 823 | { |
| 824 | XSETSYMBOL (val, symbol_free_list); |
| 825 | symbol_free_list = *(struct Lisp_Symbol **)&symbol_free_list->value; |
| 826 | } |
| 827 | else |
| 828 | { |
| 829 | if (symbol_block_index == SYMBOL_BLOCK_SIZE) |
| 830 | { |
| 831 | struct symbol_block *new = (struct symbol_block *) xmalloc (sizeof (struct symbol_block)); |
| 832 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
| 833 | new->next = symbol_block; |
| 834 | symbol_block = new; |
| 835 | symbol_block_index = 0; |
| 836 | } |
| 837 | XSETSYMBOL (val, &symbol_block->symbols[symbol_block_index++]); |
| 838 | } |
| 839 | p = XSYMBOL (val); |
| 840 | p->name = XSTRING (str); |
| 841 | p->plist = Qnil; |
| 842 | p->value = Qunbound; |
| 843 | p->function = Qunbound; |
| 844 | p->next = 0; |
| 845 | consing_since_gc += sizeof (struct Lisp_Symbol); |
| 846 | return val; |
| 847 | } |
| 848 | \f |
| 849 | /* Allocation of markers and other objects that share that structure. |
| 850 | Works like allocation of conses. */ |
| 851 | |
| 852 | #define MARKER_BLOCK_SIZE \ |
| 853 | ((1020 - sizeof (struct marker_block *)) / sizeof (union Lisp_Misc)) |
| 854 | |
| 855 | struct marker_block |
| 856 | { |
| 857 | struct marker_block *next; |
| 858 | union Lisp_Misc markers[MARKER_BLOCK_SIZE]; |
| 859 | }; |
| 860 | |
| 861 | struct marker_block *marker_block; |
| 862 | int marker_block_index; |
| 863 | |
| 864 | union Lisp_Misc *marker_free_list; |
| 865 | |
| 866 | void |
| 867 | init_marker () |
| 868 | { |
| 869 | marker_block = (struct marker_block *) malloc (sizeof (struct marker_block)); |
| 870 | marker_block->next = 0; |
| 871 | bzero (marker_block->markers, sizeof marker_block->markers); |
| 872 | marker_block_index = 0; |
| 873 | marker_free_list = 0; |
| 874 | } |
| 875 | |
| 876 | /* Return a newly allocated Lisp_Misc object, with no substructure. */ |
| 877 | Lisp_Object |
| 878 | allocate_misc () |
| 879 | { |
| 880 | Lisp_Object val; |
| 881 | |
| 882 | if (marker_free_list) |
| 883 | { |
| 884 | XSETMISC (val, marker_free_list); |
| 885 | marker_free_list = marker_free_list->u_free.chain; |
| 886 | } |
| 887 | else |
| 888 | { |
| 889 | if (marker_block_index == MARKER_BLOCK_SIZE) |
| 890 | { |
| 891 | struct marker_block *new |
| 892 | = (struct marker_block *) xmalloc (sizeof (struct marker_block)); |
| 893 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
| 894 | new->next = marker_block; |
| 895 | marker_block = new; |
| 896 | marker_block_index = 0; |
| 897 | } |
| 898 | XSETMISC (val, &marker_block->markers[marker_block_index++]); |
| 899 | } |
| 900 | consing_since_gc += sizeof (union Lisp_Misc); |
| 901 | return val; |
| 902 | } |
| 903 | |
| 904 | DEFUN ("make-marker", Fmake_marker, Smake_marker, 0, 0, 0, |
| 905 | "Return a newly allocated marker which does not point at any place.") |
| 906 | () |
| 907 | { |
| 908 | register Lisp_Object val; |
| 909 | register struct Lisp_Marker *p; |
| 910 | |
| 911 | val = allocate_misc (); |
| 912 | XMISCTYPE (val) = Lisp_Misc_Marker; |
| 913 | p = XMARKER (val); |
| 914 | p->buffer = 0; |
| 915 | p->bufpos = 0; |
| 916 | p->chain = Qnil; |
| 917 | return val; |
| 918 | } |
| 919 | \f |
| 920 | /* Allocation of strings */ |
| 921 | |
| 922 | /* Strings reside inside of string_blocks. The entire data of the string, |
| 923 | both the size and the contents, live in part of the `chars' component of a string_block. |
| 924 | The `pos' component is the index within `chars' of the first free byte. |
| 925 | |
| 926 | first_string_block points to the first string_block ever allocated. |
| 927 | Each block points to the next one with its `next' field. |
| 928 | The `prev' fields chain in reverse order. |
| 929 | The last one allocated is the one currently being filled. |
| 930 | current_string_block points to it. |
| 931 | |
| 932 | The string_blocks that hold individual large strings |
| 933 | go in a separate chain, started by large_string_blocks. */ |
| 934 | |
| 935 | |
| 936 | /* String blocks contain this many useful bytes. |
| 937 | 8188 is power of 2, minus 4 for malloc overhead. */ |
| 938 | #define STRING_BLOCK_SIZE (8188 - sizeof (struct string_block_head)) |
| 939 | |
| 940 | /* A string bigger than this gets its own specially-made string block |
| 941 | if it doesn't fit in the current one. */ |
| 942 | #define STRING_BLOCK_OUTSIZE 1024 |
| 943 | |
| 944 | struct string_block_head |
| 945 | { |
| 946 | struct string_block *next, *prev; |
| 947 | int pos; |
| 948 | }; |
| 949 | |
| 950 | struct string_block |
| 951 | { |
| 952 | struct string_block *next, *prev; |
| 953 | EMACS_INT pos; |
| 954 | char chars[STRING_BLOCK_SIZE]; |
| 955 | }; |
| 956 | |
| 957 | /* This points to the string block we are now allocating strings. */ |
| 958 | |
| 959 | struct string_block *current_string_block; |
| 960 | |
| 961 | /* This points to the oldest string block, the one that starts the chain. */ |
| 962 | |
| 963 | struct string_block *first_string_block; |
| 964 | |
| 965 | /* Last string block in chain of those made for individual large strings. */ |
| 966 | |
| 967 | struct string_block *large_string_blocks; |
| 968 | |
| 969 | /* If SIZE is the length of a string, this returns how many bytes |
| 970 | the string occupies in a string_block (including padding). */ |
| 971 | |
| 972 | #define STRING_FULLSIZE(size) (((size) + sizeof (struct Lisp_String) + PAD) \ |
| 973 | & ~(PAD - 1)) |
| 974 | #define PAD (sizeof (EMACS_INT)) |
| 975 | |
| 976 | #if 0 |
| 977 | #define STRING_FULLSIZE(SIZE) \ |
| 978 | (((SIZE) + 2 * sizeof (EMACS_INT)) & ~(sizeof (EMACS_INT) - 1)) |
| 979 | #endif |
| 980 | |
| 981 | void |
| 982 | init_strings () |
| 983 | { |
| 984 | current_string_block = (struct string_block *) malloc (sizeof (struct string_block)); |
| 985 | first_string_block = current_string_block; |
| 986 | consing_since_gc += sizeof (struct string_block); |
| 987 | current_string_block->next = 0; |
| 988 | current_string_block->prev = 0; |
| 989 | current_string_block->pos = 0; |
| 990 | large_string_blocks = 0; |
| 991 | } |
| 992 | |
| 993 | DEFUN ("make-string", Fmake_string, Smake_string, 2, 2, 0, |
| 994 | "Return a newly created string of length LENGTH, with each element being INIT.\n\ |
| 995 | Both LENGTH and INIT must be numbers.") |
| 996 | (length, init) |
| 997 | Lisp_Object length, init; |
| 998 | { |
| 999 | register Lisp_Object val; |
| 1000 | register unsigned char *p, *end, c; |
| 1001 | |
| 1002 | CHECK_NATNUM (length, 0); |
| 1003 | CHECK_NUMBER (init, 1); |
| 1004 | val = make_uninit_string (XFASTINT (length)); |
| 1005 | c = XINT (init); |
| 1006 | p = XSTRING (val)->data; |
| 1007 | end = p + XSTRING (val)->size; |
| 1008 | while (p != end) |
| 1009 | *p++ = c; |
| 1010 | *p = 0; |
| 1011 | return val; |
| 1012 | } |
| 1013 | |
| 1014 | Lisp_Object |
| 1015 | make_string (contents, length) |
| 1016 | char *contents; |
| 1017 | int length; |
| 1018 | { |
| 1019 | register Lisp_Object val; |
| 1020 | val = make_uninit_string (length); |
| 1021 | bcopy (contents, XSTRING (val)->data, length); |
| 1022 | return val; |
| 1023 | } |
| 1024 | |
| 1025 | Lisp_Object |
| 1026 | build_string (str) |
| 1027 | char *str; |
| 1028 | { |
| 1029 | return make_string (str, strlen (str)); |
| 1030 | } |
| 1031 | |
| 1032 | Lisp_Object |
| 1033 | make_uninit_string (length) |
| 1034 | int length; |
| 1035 | { |
| 1036 | register Lisp_Object val; |
| 1037 | register int fullsize = STRING_FULLSIZE (length); |
| 1038 | |
| 1039 | if (length < 0) abort (); |
| 1040 | |
| 1041 | if (fullsize <= STRING_BLOCK_SIZE - current_string_block->pos) |
| 1042 | /* This string can fit in the current string block */ |
| 1043 | { |
| 1044 | XSETSTRING (val, |
| 1045 | ((struct Lisp_String *) |
| 1046 | (current_string_block->chars + current_string_block->pos))); |
| 1047 | current_string_block->pos += fullsize; |
| 1048 | } |
| 1049 | else if (fullsize > STRING_BLOCK_OUTSIZE) |
| 1050 | /* This string gets its own string block */ |
| 1051 | { |
| 1052 | register struct string_block *new |
| 1053 | = (struct string_block *) xmalloc (sizeof (struct string_block_head) + fullsize); |
| 1054 | VALIDATE_LISP_STORAGE (new, 0); |
| 1055 | consing_since_gc += sizeof (struct string_block_head) + fullsize; |
| 1056 | new->pos = fullsize; |
| 1057 | new->next = large_string_blocks; |
| 1058 | large_string_blocks = new; |
| 1059 | XSETSTRING (val, |
| 1060 | ((struct Lisp_String *) |
| 1061 | ((struct string_block_head *)new + 1))); |
| 1062 | } |
| 1063 | else |
| 1064 | /* Make a new current string block and start it off with this string */ |
| 1065 | { |
| 1066 | register struct string_block *new |
| 1067 | = (struct string_block *) xmalloc (sizeof (struct string_block)); |
| 1068 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
| 1069 | consing_since_gc += sizeof (struct string_block); |
| 1070 | current_string_block->next = new; |
| 1071 | new->prev = current_string_block; |
| 1072 | new->next = 0; |
| 1073 | current_string_block = new; |
| 1074 | new->pos = fullsize; |
| 1075 | XSETSTRING (val, |
| 1076 | (struct Lisp_String *) current_string_block->chars); |
| 1077 | } |
| 1078 | |
| 1079 | XSTRING (val)->size = length; |
| 1080 | XSTRING (val)->data[length] = 0; |
| 1081 | INITIALIZE_INTERVAL (XSTRING (val), NULL_INTERVAL); |
| 1082 | |
| 1083 | return val; |
| 1084 | } |
| 1085 | |
| 1086 | /* Return a newly created vector or string with specified arguments as |
| 1087 | elements. If all the arguments are characters that can fit |
| 1088 | in a string of events, make a string; otherwise, make a vector. |
| 1089 | |
| 1090 | Any number of arguments, even zero arguments, are allowed. */ |
| 1091 | |
| 1092 | Lisp_Object |
| 1093 | make_event_array (nargs, args) |
| 1094 | register int nargs; |
| 1095 | Lisp_Object *args; |
| 1096 | { |
| 1097 | int i; |
| 1098 | |
| 1099 | for (i = 0; i < nargs; i++) |
| 1100 | /* The things that fit in a string |
| 1101 | are characters that are in 0...127, |
| 1102 | after discarding the meta bit and all the bits above it. */ |
| 1103 | if (!INTEGERP (args[i]) |
| 1104 | || (XUINT (args[i]) & ~(-CHAR_META)) >= 0200) |
| 1105 | return Fvector (nargs, args); |
| 1106 | |
| 1107 | /* Since the loop exited, we know that all the things in it are |
| 1108 | characters, so we can make a string. */ |
| 1109 | { |
| 1110 | Lisp_Object result; |
| 1111 | |
| 1112 | result = Fmake_string (nargs, make_number (0)); |
| 1113 | for (i = 0; i < nargs; i++) |
| 1114 | { |
| 1115 | XSTRING (result)->data[i] = XINT (args[i]); |
| 1116 | /* Move the meta bit to the right place for a string char. */ |
| 1117 | if (XINT (args[i]) & CHAR_META) |
| 1118 | XSTRING (result)->data[i] |= 0x80; |
| 1119 | } |
| 1120 | |
| 1121 | return result; |
| 1122 | } |
| 1123 | } |
| 1124 | \f |
| 1125 | /* Pure storage management. */ |
| 1126 | |
| 1127 | /* Must get an error if pure storage is full, |
| 1128 | since if it cannot hold a large string |
| 1129 | it may be able to hold conses that point to that string; |
| 1130 | then the string is not protected from gc. */ |
| 1131 | |
| 1132 | Lisp_Object |
| 1133 | make_pure_string (data, length) |
| 1134 | char *data; |
| 1135 | int length; |
| 1136 | { |
| 1137 | register Lisp_Object new; |
| 1138 | register int size = sizeof (EMACS_INT) + INTERVAL_PTR_SIZE + length + 1; |
| 1139 | |
| 1140 | if (pureptr + size > PURESIZE) |
| 1141 | error ("Pure Lisp storage exhausted"); |
| 1142 | XSETSTRING (new, PUREBEG + pureptr); |
| 1143 | XSTRING (new)->size = length; |
| 1144 | bcopy (data, XSTRING (new)->data, length); |
| 1145 | XSTRING (new)->data[length] = 0; |
| 1146 | |
| 1147 | /* We must give strings in pure storage some kind of interval. So we |
| 1148 | give them a null one. */ |
| 1149 | #if defined (USE_TEXT_PROPERTIES) |
| 1150 | XSTRING (new)->intervals = NULL_INTERVAL; |
| 1151 | #endif |
| 1152 | pureptr += (size + sizeof (EMACS_INT) - 1) |
| 1153 | / sizeof (EMACS_INT) * sizeof (EMACS_INT); |
| 1154 | return new; |
| 1155 | } |
| 1156 | |
| 1157 | Lisp_Object |
| 1158 | pure_cons (car, cdr) |
| 1159 | Lisp_Object car, cdr; |
| 1160 | { |
| 1161 | register Lisp_Object new; |
| 1162 | |
| 1163 | if (pureptr + sizeof (struct Lisp_Cons) > PURESIZE) |
| 1164 | error ("Pure Lisp storage exhausted"); |
| 1165 | XSETCONS (new, PUREBEG + pureptr); |
| 1166 | pureptr += sizeof (struct Lisp_Cons); |
| 1167 | XCONS (new)->car = Fpurecopy (car); |
| 1168 | XCONS (new)->cdr = Fpurecopy (cdr); |
| 1169 | return new; |
| 1170 | } |
| 1171 | |
| 1172 | #ifdef LISP_FLOAT_TYPE |
| 1173 | |
| 1174 | Lisp_Object |
| 1175 | make_pure_float (num) |
| 1176 | double num; |
| 1177 | { |
| 1178 | register Lisp_Object new; |
| 1179 | |
| 1180 | /* Make sure that PUREBEG + pureptr is aligned on at least a sizeof |
| 1181 | (double) boundary. Some architectures (like the sparc) require |
| 1182 | this, and I suspect that floats are rare enough that it's no |
| 1183 | tragedy for those that do. */ |
| 1184 | { |
| 1185 | int alignment; |
| 1186 | char *p = PUREBEG + pureptr; |
| 1187 | |
| 1188 | #ifdef __GNUC__ |
| 1189 | #if __GNUC__ >= 2 |
| 1190 | alignment = __alignof (struct Lisp_Float); |
| 1191 | #else |
| 1192 | alignment = sizeof (struct Lisp_Float); |
| 1193 | #endif |
| 1194 | #else |
| 1195 | alignment = sizeof (struct Lisp_Float); |
| 1196 | #endif |
| 1197 | p = (char *) (((unsigned long) p + alignment - 1) & - alignment); |
| 1198 | pureptr = p - PUREBEG; |
| 1199 | } |
| 1200 | |
| 1201 | if (pureptr + sizeof (struct Lisp_Float) > PURESIZE) |
| 1202 | error ("Pure Lisp storage exhausted"); |
| 1203 | XSETFLOAT (new, PUREBEG + pureptr); |
| 1204 | pureptr += sizeof (struct Lisp_Float); |
| 1205 | XFLOAT (new)->data = num; |
| 1206 | XSETFASTINT (XFLOAT (new)->type, 0); /* bug chasing -wsr */ |
| 1207 | return new; |
| 1208 | } |
| 1209 | |
| 1210 | #endif /* LISP_FLOAT_TYPE */ |
| 1211 | |
| 1212 | Lisp_Object |
| 1213 | make_pure_vector (len) |
| 1214 | EMACS_INT len; |
| 1215 | { |
| 1216 | register Lisp_Object new; |
| 1217 | register EMACS_INT size = sizeof (struct Lisp_Vector) + (len - 1) * sizeof (Lisp_Object); |
| 1218 | |
| 1219 | if (pureptr + size > PURESIZE) |
| 1220 | error ("Pure Lisp storage exhausted"); |
| 1221 | |
| 1222 | XSETVECTOR (new, PUREBEG + pureptr); |
| 1223 | pureptr += size; |
| 1224 | XVECTOR (new)->size = len; |
| 1225 | return new; |
| 1226 | } |
| 1227 | |
| 1228 | DEFUN ("purecopy", Fpurecopy, Spurecopy, 1, 1, 0, |
| 1229 | "Make a copy of OBJECT in pure storage.\n\ |
| 1230 | Recursively copies contents of vectors and cons cells.\n\ |
| 1231 | Does not copy symbols.") |
| 1232 | (obj) |
| 1233 | register Lisp_Object obj; |
| 1234 | { |
| 1235 | if (NILP (Vpurify_flag)) |
| 1236 | return obj; |
| 1237 | |
| 1238 | if ((PNTR_COMPARISON_TYPE) XPNTR (obj) < (PNTR_COMPARISON_TYPE) ((char *) pure + PURESIZE) |
| 1239 | && (PNTR_COMPARISON_TYPE) XPNTR (obj) >= (PNTR_COMPARISON_TYPE) pure) |
| 1240 | return obj; |
| 1241 | |
| 1242 | if (CONSP (obj)) |
| 1243 | return pure_cons (XCONS (obj)->car, XCONS (obj)->cdr); |
| 1244 | #ifdef LISP_FLOAT_TYPE |
| 1245 | else if (FLOATP (obj)) |
| 1246 | return make_pure_float (XFLOAT (obj)->data); |
| 1247 | #endif /* LISP_FLOAT_TYPE */ |
| 1248 | else if (STRINGP (obj)) |
| 1249 | return make_pure_string (XSTRING (obj)->data, XSTRING (obj)->size); |
| 1250 | else if (COMPILEDP (obj) || VECTORP (obj)) |
| 1251 | { |
| 1252 | register struct Lisp_Vector *vec; |
| 1253 | register int i, size; |
| 1254 | |
| 1255 | size = XVECTOR (obj)->size; |
| 1256 | if (size & PSEUDOVECTOR_FLAG) |
| 1257 | size &= PSEUDOVECTOR_SIZE_MASK; |
| 1258 | vec = XVECTOR (make_pure_vector (size)); |
| 1259 | for (i = 0; i < size; i++) |
| 1260 | vec->contents[i] = Fpurecopy (XVECTOR (obj)->contents[i]); |
| 1261 | if (COMPILEDP (obj)) |
| 1262 | XSETCOMPILED (obj, vec); |
| 1263 | else |
| 1264 | XSETVECTOR (obj, vec); |
| 1265 | return obj; |
| 1266 | } |
| 1267 | else if (MARKERP (obj)) |
| 1268 | error ("Attempt to copy a marker to pure storage"); |
| 1269 | else |
| 1270 | return obj; |
| 1271 | } |
| 1272 | \f |
| 1273 | /* Recording what needs to be marked for gc. */ |
| 1274 | |
| 1275 | struct gcpro *gcprolist; |
| 1276 | |
| 1277 | #define NSTATICS 768 |
| 1278 | |
| 1279 | Lisp_Object *staticvec[NSTATICS] = {0}; |
| 1280 | |
| 1281 | int staticidx = 0; |
| 1282 | |
| 1283 | /* Put an entry in staticvec, pointing at the variable whose address is given */ |
| 1284 | |
| 1285 | void |
| 1286 | staticpro (varaddress) |
| 1287 | Lisp_Object *varaddress; |
| 1288 | { |
| 1289 | staticvec[staticidx++] = varaddress; |
| 1290 | if (staticidx >= NSTATICS) |
| 1291 | abort (); |
| 1292 | } |
| 1293 | |
| 1294 | struct catchtag |
| 1295 | { |
| 1296 | Lisp_Object tag; |
| 1297 | Lisp_Object val; |
| 1298 | struct catchtag *next; |
| 1299 | /* jmp_buf jmp; /* We don't need this for GC purposes */ |
| 1300 | }; |
| 1301 | |
| 1302 | struct backtrace |
| 1303 | { |
| 1304 | struct backtrace *next; |
| 1305 | Lisp_Object *function; |
| 1306 | Lisp_Object *args; /* Points to vector of args. */ |
| 1307 | int nargs; /* length of vector */ |
| 1308 | /* if nargs is UNEVALLED, args points to slot holding list of unevalled args */ |
| 1309 | char evalargs; |
| 1310 | }; |
| 1311 | \f |
| 1312 | /* Garbage collection! */ |
| 1313 | |
| 1314 | int total_conses, total_markers, total_symbols, total_string_size, total_vector_size; |
| 1315 | int total_free_conses, total_free_markers, total_free_symbols; |
| 1316 | #ifdef LISP_FLOAT_TYPE |
| 1317 | int total_free_floats, total_floats; |
| 1318 | #endif /* LISP_FLOAT_TYPE */ |
| 1319 | |
| 1320 | /* Temporarily prevent garbage collection. */ |
| 1321 | |
| 1322 | int |
| 1323 | inhibit_garbage_collection () |
| 1324 | { |
| 1325 | int count = specpdl_ptr - specpdl; |
| 1326 | Lisp_Object number; |
| 1327 | int nbits = min (VALBITS, INTBITS); |
| 1328 | |
| 1329 | XSETINT (number, ((EMACS_INT) 1 << (nbits - 1)) - 1); |
| 1330 | |
| 1331 | specbind (Qgc_cons_threshold, number); |
| 1332 | |
| 1333 | return count; |
| 1334 | } |
| 1335 | |
| 1336 | DEFUN ("garbage-collect", Fgarbage_collect, Sgarbage_collect, 0, 0, "", |
| 1337 | "Reclaim storage for Lisp objects no longer needed.\n\ |
| 1338 | Returns info on amount of space in use:\n\ |
| 1339 | ((USED-CONSES . FREE-CONSES) (USED-SYMS . FREE-SYMS)\n\ |
| 1340 | (USED-MARKERS . FREE-MARKERS) USED-STRING-CHARS USED-VECTOR-SLOTS\n\ |
| 1341 | (USED-FLOATS . FREE-FLOATS))\n\ |
| 1342 | Garbage collection happens automatically if you cons more than\n\ |
| 1343 | `gc-cons-threshold' bytes of Lisp data since previous garbage collection.") |
| 1344 | () |
| 1345 | { |
| 1346 | register struct gcpro *tail; |
| 1347 | register struct specbinding *bind; |
| 1348 | struct catchtag *catch; |
| 1349 | struct handler *handler; |
| 1350 | register struct backtrace *backlist; |
| 1351 | register Lisp_Object tem; |
| 1352 | char *omessage = echo_area_glyphs; |
| 1353 | int omessage_length = echo_area_glyphs_length; |
| 1354 | char stack_top_variable; |
| 1355 | register int i; |
| 1356 | |
| 1357 | /* In case user calls debug_print during GC, |
| 1358 | don't let that cause a recursive GC. */ |
| 1359 | consing_since_gc = 0; |
| 1360 | |
| 1361 | /* Save a copy of the contents of the stack, for debugging. */ |
| 1362 | #if MAX_SAVE_STACK > 0 |
| 1363 | if (NILP (Vpurify_flag)) |
| 1364 | { |
| 1365 | i = &stack_top_variable - stack_bottom; |
| 1366 | if (i < 0) i = -i; |
| 1367 | if (i < MAX_SAVE_STACK) |
| 1368 | { |
| 1369 | if (stack_copy == 0) |
| 1370 | stack_copy = (char *) xmalloc (stack_copy_size = i); |
| 1371 | else if (stack_copy_size < i) |
| 1372 | stack_copy = (char *) xrealloc (stack_copy, (stack_copy_size = i)); |
| 1373 | if (stack_copy) |
| 1374 | { |
| 1375 | if ((EMACS_INT) (&stack_top_variable - stack_bottom) > 0) |
| 1376 | bcopy (stack_bottom, stack_copy, i); |
| 1377 | else |
| 1378 | bcopy (&stack_top_variable, stack_copy, i); |
| 1379 | } |
| 1380 | } |
| 1381 | } |
| 1382 | #endif /* MAX_SAVE_STACK > 0 */ |
| 1383 | |
| 1384 | if (!noninteractive) |
| 1385 | message1_nolog ("Garbage collecting..."); |
| 1386 | |
| 1387 | /* Don't keep command history around forever */ |
| 1388 | tem = Fnthcdr (make_number (30), Vcommand_history); |
| 1389 | if (CONSP (tem)) |
| 1390 | XCONS (tem)->cdr = Qnil; |
| 1391 | |
| 1392 | /* Likewise for undo information. */ |
| 1393 | { |
| 1394 | register struct buffer *nextb = all_buffers; |
| 1395 | |
| 1396 | while (nextb) |
| 1397 | { |
| 1398 | /* If a buffer's undo list is Qt, that means that undo is |
| 1399 | turned off in that buffer. Calling truncate_undo_list on |
| 1400 | Qt tends to return NULL, which effectively turns undo back on. |
| 1401 | So don't call truncate_undo_list if undo_list is Qt. */ |
| 1402 | if (! EQ (nextb->undo_list, Qt)) |
| 1403 | nextb->undo_list |
| 1404 | = truncate_undo_list (nextb->undo_list, undo_limit, |
| 1405 | undo_strong_limit); |
| 1406 | nextb = nextb->next; |
| 1407 | } |
| 1408 | } |
| 1409 | |
| 1410 | gc_in_progress = 1; |
| 1411 | |
| 1412 | /* clear_marks (); */ |
| 1413 | |
| 1414 | /* In each "large string", set the MARKBIT of the size field. |
| 1415 | That enables mark_object to recognize them. */ |
| 1416 | { |
| 1417 | register struct string_block *b; |
| 1418 | for (b = large_string_blocks; b; b = b->next) |
| 1419 | ((struct Lisp_String *)(&b->chars[0]))->size |= MARKBIT; |
| 1420 | } |
| 1421 | |
| 1422 | /* Mark all the special slots that serve as the roots of accessibility. |
| 1423 | |
| 1424 | Usually the special slots to mark are contained in particular structures. |
| 1425 | Then we know no slot is marked twice because the structures don't overlap. |
| 1426 | In some cases, the structures point to the slots to be marked. |
| 1427 | For these, we use MARKBIT to avoid double marking of the slot. */ |
| 1428 | |
| 1429 | for (i = 0; i < staticidx; i++) |
| 1430 | mark_object (staticvec[i]); |
| 1431 | for (tail = gcprolist; tail; tail = tail->next) |
| 1432 | for (i = 0; i < tail->nvars; i++) |
| 1433 | if (!XMARKBIT (tail->var[i])) |
| 1434 | { |
| 1435 | mark_object (&tail->var[i]); |
| 1436 | XMARK (tail->var[i]); |
| 1437 | } |
| 1438 | for (bind = specpdl; bind != specpdl_ptr; bind++) |
| 1439 | { |
| 1440 | mark_object (&bind->symbol); |
| 1441 | mark_object (&bind->old_value); |
| 1442 | } |
| 1443 | for (catch = catchlist; catch; catch = catch->next) |
| 1444 | { |
| 1445 | mark_object (&catch->tag); |
| 1446 | mark_object (&catch->val); |
| 1447 | } |
| 1448 | for (handler = handlerlist; handler; handler = handler->next) |
| 1449 | { |
| 1450 | mark_object (&handler->handler); |
| 1451 | mark_object (&handler->var); |
| 1452 | } |
| 1453 | for (backlist = backtrace_list; backlist; backlist = backlist->next) |
| 1454 | { |
| 1455 | if (!XMARKBIT (*backlist->function)) |
| 1456 | { |
| 1457 | mark_object (backlist->function); |
| 1458 | XMARK (*backlist->function); |
| 1459 | } |
| 1460 | if (backlist->nargs == UNEVALLED || backlist->nargs == MANY) |
| 1461 | i = 0; |
| 1462 | else |
| 1463 | i = backlist->nargs - 1; |
| 1464 | for (; i >= 0; i--) |
| 1465 | if (!XMARKBIT (backlist->args[i])) |
| 1466 | { |
| 1467 | mark_object (&backlist->args[i]); |
| 1468 | XMARK (backlist->args[i]); |
| 1469 | } |
| 1470 | } |
| 1471 | mark_kboards (); |
| 1472 | |
| 1473 | gc_sweep (); |
| 1474 | |
| 1475 | /* Clear the mark bits that we set in certain root slots. */ |
| 1476 | |
| 1477 | for (tail = gcprolist; tail; tail = tail->next) |
| 1478 | for (i = 0; i < tail->nvars; i++) |
| 1479 | XUNMARK (tail->var[i]); |
| 1480 | for (backlist = backtrace_list; backlist; backlist = backlist->next) |
| 1481 | { |
| 1482 | XUNMARK (*backlist->function); |
| 1483 | if (backlist->nargs == UNEVALLED || backlist->nargs == MANY) |
| 1484 | i = 0; |
| 1485 | else |
| 1486 | i = backlist->nargs - 1; |
| 1487 | for (; i >= 0; i--) |
| 1488 | XUNMARK (backlist->args[i]); |
| 1489 | } |
| 1490 | XUNMARK (buffer_defaults.name); |
| 1491 | XUNMARK (buffer_local_symbols.name); |
| 1492 | |
| 1493 | /* clear_marks (); */ |
| 1494 | gc_in_progress = 0; |
| 1495 | |
| 1496 | consing_since_gc = 0; |
| 1497 | if (gc_cons_threshold < 10000) |
| 1498 | gc_cons_threshold = 10000; |
| 1499 | |
| 1500 | if (omessage || minibuf_level > 0) |
| 1501 | message2_nolog (omessage, omessage_length); |
| 1502 | else if (!noninteractive) |
| 1503 | message1_nolog ("Garbage collecting...done"); |
| 1504 | |
| 1505 | return Fcons (Fcons (make_number (total_conses), |
| 1506 | make_number (total_free_conses)), |
| 1507 | Fcons (Fcons (make_number (total_symbols), |
| 1508 | make_number (total_free_symbols)), |
| 1509 | Fcons (Fcons (make_number (total_markers), |
| 1510 | make_number (total_free_markers)), |
| 1511 | Fcons (make_number (total_string_size), |
| 1512 | Fcons (make_number (total_vector_size), |
| 1513 | |
| 1514 | #ifdef LISP_FLOAT_TYPE |
| 1515 | Fcons (Fcons (make_number (total_floats), |
| 1516 | make_number (total_free_floats)), |
| 1517 | Qnil) |
| 1518 | #else /* not LISP_FLOAT_TYPE */ |
| 1519 | Qnil |
| 1520 | #endif /* not LISP_FLOAT_TYPE */ |
| 1521 | ))))); |
| 1522 | } |
| 1523 | \f |
| 1524 | #if 0 |
| 1525 | static void |
| 1526 | clear_marks () |
| 1527 | { |
| 1528 | /* Clear marks on all conses */ |
| 1529 | { |
| 1530 | register struct cons_block *cblk; |
| 1531 | register int lim = cons_block_index; |
| 1532 | |
| 1533 | for (cblk = cons_block; cblk; cblk = cblk->next) |
| 1534 | { |
| 1535 | register int i; |
| 1536 | for (i = 0; i < lim; i++) |
| 1537 | XUNMARK (cblk->conses[i].car); |
| 1538 | lim = CONS_BLOCK_SIZE; |
| 1539 | } |
| 1540 | } |
| 1541 | /* Clear marks on all symbols */ |
| 1542 | { |
| 1543 | register struct symbol_block *sblk; |
| 1544 | register int lim = symbol_block_index; |
| 1545 | |
| 1546 | for (sblk = symbol_block; sblk; sblk = sblk->next) |
| 1547 | { |
| 1548 | register int i; |
| 1549 | for (i = 0; i < lim; i++) |
| 1550 | { |
| 1551 | XUNMARK (sblk->symbols[i].plist); |
| 1552 | } |
| 1553 | lim = SYMBOL_BLOCK_SIZE; |
| 1554 | } |
| 1555 | } |
| 1556 | /* Clear marks on all markers */ |
| 1557 | { |
| 1558 | register struct marker_block *sblk; |
| 1559 | register int lim = marker_block_index; |
| 1560 | |
| 1561 | for (sblk = marker_block; sblk; sblk = sblk->next) |
| 1562 | { |
| 1563 | register int i; |
| 1564 | for (i = 0; i < lim; i++) |
| 1565 | if (sblk->markers[i].u_marker.type == Lisp_Misc_Marker) |
| 1566 | XUNMARK (sblk->markers[i].u_marker.chain); |
| 1567 | lim = MARKER_BLOCK_SIZE; |
| 1568 | } |
| 1569 | } |
| 1570 | /* Clear mark bits on all buffers */ |
| 1571 | { |
| 1572 | register struct buffer *nextb = all_buffers; |
| 1573 | |
| 1574 | while (nextb) |
| 1575 | { |
| 1576 | XUNMARK (nextb->name); |
| 1577 | nextb = nextb->next; |
| 1578 | } |
| 1579 | } |
| 1580 | } |
| 1581 | #endif |
| 1582 | \f |
| 1583 | /* Mark reference to a Lisp_Object. |
| 1584 | If the object referred to has not been seen yet, recursively mark |
| 1585 | all the references contained in it. |
| 1586 | |
| 1587 | If the object referenced is a short string, the referencing slot |
| 1588 | is threaded into a chain of such slots, pointed to from |
| 1589 | the `size' field of the string. The actual string size |
| 1590 | lives in the last slot in the chain. We recognize the end |
| 1591 | because it is < (unsigned) STRING_BLOCK_SIZE. */ |
| 1592 | |
| 1593 | #define LAST_MARKED_SIZE 500 |
| 1594 | Lisp_Object *last_marked[LAST_MARKED_SIZE]; |
| 1595 | int last_marked_index; |
| 1596 | |
| 1597 | static void |
| 1598 | mark_object (objptr) |
| 1599 | Lisp_Object *objptr; |
| 1600 | { |
| 1601 | register Lisp_Object obj; |
| 1602 | |
| 1603 | loop: |
| 1604 | obj = *objptr; |
| 1605 | loop2: |
| 1606 | XUNMARK (obj); |
| 1607 | |
| 1608 | if ((PNTR_COMPARISON_TYPE) XPNTR (obj) < (PNTR_COMPARISON_TYPE) ((char *) pure + PURESIZE) |
| 1609 | && (PNTR_COMPARISON_TYPE) XPNTR (obj) >= (PNTR_COMPARISON_TYPE) pure) |
| 1610 | return; |
| 1611 | |
| 1612 | last_marked[last_marked_index++] = objptr; |
| 1613 | if (last_marked_index == LAST_MARKED_SIZE) |
| 1614 | last_marked_index = 0; |
| 1615 | |
| 1616 | switch (SWITCH_ENUM_CAST (XGCTYPE (obj))) |
| 1617 | { |
| 1618 | case Lisp_String: |
| 1619 | { |
| 1620 | register struct Lisp_String *ptr = XSTRING (obj); |
| 1621 | |
| 1622 | MARK_INTERVAL_TREE (ptr->intervals); |
| 1623 | if (ptr->size & MARKBIT) |
| 1624 | /* A large string. Just set ARRAY_MARK_FLAG. */ |
| 1625 | ptr->size |= ARRAY_MARK_FLAG; |
| 1626 | else |
| 1627 | { |
| 1628 | /* A small string. Put this reference |
| 1629 | into the chain of references to it. |
| 1630 | If the address includes MARKBIT, put that bit elsewhere |
| 1631 | when we store OBJPTR into the size field. */ |
| 1632 | |
| 1633 | if (XMARKBIT (*objptr)) |
| 1634 | { |
| 1635 | XSETFASTINT (*objptr, ptr->size); |
| 1636 | XMARK (*objptr); |
| 1637 | } |
| 1638 | else |
| 1639 | XSETFASTINT (*objptr, ptr->size); |
| 1640 | |
| 1641 | if ((EMACS_INT) objptr & DONT_COPY_FLAG) |
| 1642 | abort (); |
| 1643 | ptr->size = (EMACS_INT) objptr; |
| 1644 | if (ptr->size & MARKBIT) |
| 1645 | ptr->size ^= MARKBIT | DONT_COPY_FLAG; |
| 1646 | } |
| 1647 | } |
| 1648 | break; |
| 1649 | |
| 1650 | case Lisp_Vectorlike: |
| 1651 | if (GC_BUFFERP (obj)) |
| 1652 | { |
| 1653 | if (!XMARKBIT (XBUFFER (obj)->name)) |
| 1654 | mark_buffer (obj); |
| 1655 | } |
| 1656 | else if (GC_SUBRP (obj)) |
| 1657 | break; |
| 1658 | else if (GC_COMPILEDP (obj)) |
| 1659 | /* We could treat this just like a vector, but it is better |
| 1660 | to save the COMPILED_CONSTANTS element for last and avoid recursion |
| 1661 | there. */ |
| 1662 | { |
| 1663 | register struct Lisp_Vector *ptr = XVECTOR (obj); |
| 1664 | register EMACS_INT size = ptr->size; |
| 1665 | /* See comment above under Lisp_Vector. */ |
| 1666 | struct Lisp_Vector *volatile ptr1 = ptr; |
| 1667 | register int i; |
| 1668 | |
| 1669 | if (size & ARRAY_MARK_FLAG) |
| 1670 | break; /* Already marked */ |
| 1671 | ptr->size |= ARRAY_MARK_FLAG; /* Else mark it */ |
| 1672 | size &= PSEUDOVECTOR_SIZE_MASK; |
| 1673 | for (i = 0; i < size; i++) /* and then mark its elements */ |
| 1674 | { |
| 1675 | if (i != COMPILED_CONSTANTS) |
| 1676 | mark_object (&ptr1->contents[i]); |
| 1677 | } |
| 1678 | /* This cast should be unnecessary, but some Mips compiler complains |
| 1679 | (MIPS-ABI + SysVR4, DC/OSx, etc). */ |
| 1680 | objptr = (Lisp_Object *) &ptr1->contents[COMPILED_CONSTANTS]; |
| 1681 | goto loop; |
| 1682 | } |
| 1683 | #ifdef MULTI_FRAME |
| 1684 | else if (GC_FRAMEP (obj)) |
| 1685 | { |
| 1686 | /* See comment above under Lisp_Vector for why this is volatile. */ |
| 1687 | register struct frame *volatile ptr = XFRAME (obj); |
| 1688 | register EMACS_INT size = ptr->size; |
| 1689 | |
| 1690 | if (size & ARRAY_MARK_FLAG) break; /* Already marked */ |
| 1691 | ptr->size |= ARRAY_MARK_FLAG; /* Else mark it */ |
| 1692 | |
| 1693 | mark_object (&ptr->name); |
| 1694 | mark_object (&ptr->icon_name); |
| 1695 | mark_object (&ptr->focus_frame); |
| 1696 | mark_object (&ptr->selected_window); |
| 1697 | mark_object (&ptr->minibuffer_window); |
| 1698 | mark_object (&ptr->param_alist); |
| 1699 | mark_object (&ptr->scroll_bars); |
| 1700 | mark_object (&ptr->condemned_scroll_bars); |
| 1701 | mark_object (&ptr->menu_bar_items); |
| 1702 | mark_object (&ptr->face_alist); |
| 1703 | mark_object (&ptr->menu_bar_vector); |
| 1704 | mark_object (&ptr->buffer_predicate); |
| 1705 | } |
| 1706 | #endif /* MULTI_FRAME */ |
| 1707 | else |
| 1708 | { |
| 1709 | register struct Lisp_Vector *ptr = XVECTOR (obj); |
| 1710 | register EMACS_INT size = ptr->size; |
| 1711 | /* The reason we use ptr1 is to avoid an apparent hardware bug |
| 1712 | that happens occasionally on the FSF's HP 300s. |
| 1713 | The bug is that a2 gets clobbered by recursive calls to mark_object. |
| 1714 | The clobberage seems to happen during function entry, |
| 1715 | perhaps in the moveml instruction. |
| 1716 | Yes, this is a crock, but we have to do it. */ |
| 1717 | struct Lisp_Vector *volatile ptr1 = ptr; |
| 1718 | register int i; |
| 1719 | |
| 1720 | if (size & ARRAY_MARK_FLAG) break; /* Already marked */ |
| 1721 | ptr->size |= ARRAY_MARK_FLAG; /* Else mark it */ |
| 1722 | if (size & PSEUDOVECTOR_FLAG) |
| 1723 | size &= PSEUDOVECTOR_SIZE_MASK; |
| 1724 | for (i = 0; i < size; i++) /* and then mark its elements */ |
| 1725 | mark_object (&ptr1->contents[i]); |
| 1726 | } |
| 1727 | break; |
| 1728 | |
| 1729 | case Lisp_Symbol: |
| 1730 | { |
| 1731 | /* See comment above under Lisp_Vector for why this is volatile. */ |
| 1732 | register struct Lisp_Symbol *volatile ptr = XSYMBOL (obj); |
| 1733 | struct Lisp_Symbol *ptrx; |
| 1734 | |
| 1735 | if (XMARKBIT (ptr->plist)) break; |
| 1736 | XMARK (ptr->plist); |
| 1737 | mark_object ((Lisp_Object *) &ptr->value); |
| 1738 | mark_object (&ptr->function); |
| 1739 | mark_object (&ptr->plist); |
| 1740 | XSETTYPE (*(Lisp_Object *) &ptr->name, Lisp_String); |
| 1741 | mark_object (&ptr->name); |
| 1742 | ptr = ptr->next; |
| 1743 | if (ptr) |
| 1744 | { |
| 1745 | /* For the benefit of the last_marked log. */ |
| 1746 | objptr = (Lisp_Object *)&XSYMBOL (obj)->next; |
| 1747 | ptrx = ptr; /* Use of ptrx avoids compiler bug on Sun */ |
| 1748 | XSETSYMBOL (obj, ptrx); |
| 1749 | /* We can't goto loop here because *objptr doesn't contain an |
| 1750 | actual Lisp_Object with valid datatype field. */ |
| 1751 | goto loop2; |
| 1752 | } |
| 1753 | } |
| 1754 | break; |
| 1755 | |
| 1756 | case Lisp_Misc: |
| 1757 | switch (XMISCTYPE (obj)) |
| 1758 | { |
| 1759 | case Lisp_Misc_Marker: |
| 1760 | XMARK (XMARKER (obj)->chain); |
| 1761 | /* DO NOT mark thru the marker's chain. |
| 1762 | The buffer's markers chain does not preserve markers from gc; |
| 1763 | instead, markers are removed from the chain when freed by gc. */ |
| 1764 | break; |
| 1765 | |
| 1766 | case Lisp_Misc_Buffer_Local_Value: |
| 1767 | case Lisp_Misc_Some_Buffer_Local_Value: |
| 1768 | { |
| 1769 | register struct Lisp_Buffer_Local_Value *ptr |
| 1770 | = XBUFFER_LOCAL_VALUE (obj); |
| 1771 | if (XMARKBIT (ptr->car)) break; |
| 1772 | XMARK (ptr->car); |
| 1773 | /* If the cdr is nil, avoid recursion for the car. */ |
| 1774 | if (EQ (ptr->cdr, Qnil)) |
| 1775 | { |
| 1776 | objptr = &ptr->car; |
| 1777 | goto loop; |
| 1778 | } |
| 1779 | mark_object (&ptr->car); |
| 1780 | /* See comment above under Lisp_Vector for why not use ptr here. */ |
| 1781 | objptr = &XBUFFER_LOCAL_VALUE (obj)->cdr; |
| 1782 | goto loop; |
| 1783 | } |
| 1784 | |
| 1785 | case Lisp_Misc_Intfwd: |
| 1786 | case Lisp_Misc_Boolfwd: |
| 1787 | case Lisp_Misc_Objfwd: |
| 1788 | case Lisp_Misc_Buffer_Objfwd: |
| 1789 | case Lisp_Misc_Kboard_Objfwd: |
| 1790 | /* Don't bother with Lisp_Buffer_Objfwd, |
| 1791 | since all markable slots in current buffer marked anyway. */ |
| 1792 | /* Don't need to do Lisp_Objfwd, since the places they point |
| 1793 | are protected with staticpro. */ |
| 1794 | break; |
| 1795 | |
| 1796 | case Lisp_Misc_Overlay: |
| 1797 | { |
| 1798 | struct Lisp_Overlay *ptr = XOVERLAY (obj); |
| 1799 | if (!XMARKBIT (ptr->plist)) |
| 1800 | { |
| 1801 | XMARK (ptr->plist); |
| 1802 | mark_object (&ptr->start); |
| 1803 | mark_object (&ptr->end); |
| 1804 | objptr = &ptr->plist; |
| 1805 | goto loop; |
| 1806 | } |
| 1807 | } |
| 1808 | break; |
| 1809 | |
| 1810 | default: |
| 1811 | abort (); |
| 1812 | } |
| 1813 | break; |
| 1814 | |
| 1815 | case Lisp_Cons: |
| 1816 | { |
| 1817 | register struct Lisp_Cons *ptr = XCONS (obj); |
| 1818 | if (XMARKBIT (ptr->car)) break; |
| 1819 | XMARK (ptr->car); |
| 1820 | /* If the cdr is nil, avoid recursion for the car. */ |
| 1821 | if (EQ (ptr->cdr, Qnil)) |
| 1822 | { |
| 1823 | objptr = &ptr->car; |
| 1824 | goto loop; |
| 1825 | } |
| 1826 | mark_object (&ptr->car); |
| 1827 | /* See comment above under Lisp_Vector for why not use ptr here. */ |
| 1828 | objptr = &XCONS (obj)->cdr; |
| 1829 | goto loop; |
| 1830 | } |
| 1831 | |
| 1832 | #ifdef LISP_FLOAT_TYPE |
| 1833 | case Lisp_Float: |
| 1834 | XMARK (XFLOAT (obj)->type); |
| 1835 | break; |
| 1836 | #endif /* LISP_FLOAT_TYPE */ |
| 1837 | |
| 1838 | case Lisp_Int: |
| 1839 | break; |
| 1840 | |
| 1841 | default: |
| 1842 | abort (); |
| 1843 | } |
| 1844 | } |
| 1845 | |
| 1846 | /* Mark the pointers in a buffer structure. */ |
| 1847 | |
| 1848 | static void |
| 1849 | mark_buffer (buf) |
| 1850 | Lisp_Object buf; |
| 1851 | { |
| 1852 | register struct buffer *buffer = XBUFFER (buf); |
| 1853 | register Lisp_Object *ptr; |
| 1854 | Lisp_Object base_buffer; |
| 1855 | |
| 1856 | /* This is the buffer's markbit */ |
| 1857 | mark_object (&buffer->name); |
| 1858 | XMARK (buffer->name); |
| 1859 | |
| 1860 | MARK_INTERVAL_TREE (BUF_INTERVALS (buffer)); |
| 1861 | |
| 1862 | #if 0 |
| 1863 | mark_object (buffer->syntax_table); |
| 1864 | |
| 1865 | /* Mark the various string-pointers in the buffer object. |
| 1866 | Since the strings may be relocated, we must mark them |
| 1867 | in their actual slots. So gc_sweep must convert each slot |
| 1868 | back to an ordinary C pointer. */ |
| 1869 | XSETSTRING (*(Lisp_Object *)&buffer->upcase_table, buffer->upcase_table); |
| 1870 | mark_object ((Lisp_Object *)&buffer->upcase_table); |
| 1871 | XSETSTRING (*(Lisp_Object *)&buffer->downcase_table, buffer->downcase_table); |
| 1872 | mark_object ((Lisp_Object *)&buffer->downcase_table); |
| 1873 | |
| 1874 | XSETSTRING (*(Lisp_Object *)&buffer->sort_table, buffer->sort_table); |
| 1875 | mark_object ((Lisp_Object *)&buffer->sort_table); |
| 1876 | XSETSTRING (*(Lisp_Object *)&buffer->folding_sort_table, buffer->folding_sort_table); |
| 1877 | mark_object ((Lisp_Object *)&buffer->folding_sort_table); |
| 1878 | #endif |
| 1879 | |
| 1880 | for (ptr = &buffer->name + 1; |
| 1881 | (char *)ptr < (char *)buffer + sizeof (struct buffer); |
| 1882 | ptr++) |
| 1883 | mark_object (ptr); |
| 1884 | |
| 1885 | /* If this is an indirect buffer, mark its base buffer. */ |
| 1886 | if (buffer->base_buffer && !XMARKBIT (buffer->base_buffer->name)) |
| 1887 | { |
| 1888 | XSETBUFFER (base_buffer, buffer->base_buffer); |
| 1889 | mark_buffer (base_buffer); |
| 1890 | } |
| 1891 | } |
| 1892 | |
| 1893 | |
| 1894 | /* Mark the pointers in the kboard objects. */ |
| 1895 | |
| 1896 | static void |
| 1897 | mark_kboards () |
| 1898 | { |
| 1899 | KBOARD *kb; |
| 1900 | Lisp_Object *p; |
| 1901 | for (kb = all_kboards; kb; kb = kb->next_kboard) |
| 1902 | { |
| 1903 | if (kb->kbd_macro_buffer) |
| 1904 | for (p = kb->kbd_macro_buffer; p < kb->kbd_macro_ptr; p++) |
| 1905 | mark_object (p); |
| 1906 | mark_object (&kb->Vprefix_arg); |
| 1907 | mark_object (&kb->kbd_queue); |
| 1908 | mark_object (&kb->Vlast_kbd_macro); |
| 1909 | mark_object (&kb->Vsystem_key_alist); |
| 1910 | mark_object (&kb->system_key_syms); |
| 1911 | } |
| 1912 | } |
| 1913 | \f |
| 1914 | /* Sweep: find all structures not marked, and free them. */ |
| 1915 | |
| 1916 | static void |
| 1917 | gc_sweep () |
| 1918 | { |
| 1919 | total_string_size = 0; |
| 1920 | compact_strings (); |
| 1921 | |
| 1922 | /* Put all unmarked conses on free list */ |
| 1923 | { |
| 1924 | register struct cons_block *cblk; |
| 1925 | register int lim = cons_block_index; |
| 1926 | register int num_free = 0, num_used = 0; |
| 1927 | |
| 1928 | cons_free_list = 0; |
| 1929 | |
| 1930 | for (cblk = cons_block; cblk; cblk = cblk->next) |
| 1931 | { |
| 1932 | register int i; |
| 1933 | for (i = 0; i < lim; i++) |
| 1934 | if (!XMARKBIT (cblk->conses[i].car)) |
| 1935 | { |
| 1936 | num_free++; |
| 1937 | *(struct Lisp_Cons **)&cblk->conses[i].car = cons_free_list; |
| 1938 | cons_free_list = &cblk->conses[i]; |
| 1939 | } |
| 1940 | else |
| 1941 | { |
| 1942 | num_used++; |
| 1943 | XUNMARK (cblk->conses[i].car); |
| 1944 | } |
| 1945 | lim = CONS_BLOCK_SIZE; |
| 1946 | } |
| 1947 | total_conses = num_used; |
| 1948 | total_free_conses = num_free; |
| 1949 | } |
| 1950 | |
| 1951 | #ifdef LISP_FLOAT_TYPE |
| 1952 | /* Put all unmarked floats on free list */ |
| 1953 | { |
| 1954 | register struct float_block *fblk; |
| 1955 | register int lim = float_block_index; |
| 1956 | register int num_free = 0, num_used = 0; |
| 1957 | |
| 1958 | float_free_list = 0; |
| 1959 | |
| 1960 | for (fblk = float_block; fblk; fblk = fblk->next) |
| 1961 | { |
| 1962 | register int i; |
| 1963 | for (i = 0; i < lim; i++) |
| 1964 | if (!XMARKBIT (fblk->floats[i].type)) |
| 1965 | { |
| 1966 | num_free++; |
| 1967 | *(struct Lisp_Float **)&fblk->floats[i].type = float_free_list; |
| 1968 | float_free_list = &fblk->floats[i]; |
| 1969 | } |
| 1970 | else |
| 1971 | { |
| 1972 | num_used++; |
| 1973 | XUNMARK (fblk->floats[i].type); |
| 1974 | } |
| 1975 | lim = FLOAT_BLOCK_SIZE; |
| 1976 | } |
| 1977 | total_floats = num_used; |
| 1978 | total_free_floats = num_free; |
| 1979 | } |
| 1980 | #endif /* LISP_FLOAT_TYPE */ |
| 1981 | |
| 1982 | #ifdef USE_TEXT_PROPERTIES |
| 1983 | /* Put all unmarked intervals on free list */ |
| 1984 | { |
| 1985 | register struct interval_block *iblk; |
| 1986 | register int lim = interval_block_index; |
| 1987 | register int num_free = 0, num_used = 0; |
| 1988 | |
| 1989 | interval_free_list = 0; |
| 1990 | |
| 1991 | for (iblk = interval_block; iblk; iblk = iblk->next) |
| 1992 | { |
| 1993 | register int i; |
| 1994 | |
| 1995 | for (i = 0; i < lim; i++) |
| 1996 | { |
| 1997 | if (! XMARKBIT (iblk->intervals[i].plist)) |
| 1998 | { |
| 1999 | iblk->intervals[i].parent = interval_free_list; |
| 2000 | interval_free_list = &iblk->intervals[i]; |
| 2001 | num_free++; |
| 2002 | } |
| 2003 | else |
| 2004 | { |
| 2005 | num_used++; |
| 2006 | XUNMARK (iblk->intervals[i].plist); |
| 2007 | } |
| 2008 | } |
| 2009 | lim = INTERVAL_BLOCK_SIZE; |
| 2010 | } |
| 2011 | total_intervals = num_used; |
| 2012 | total_free_intervals = num_free; |
| 2013 | } |
| 2014 | #endif /* USE_TEXT_PROPERTIES */ |
| 2015 | |
| 2016 | /* Put all unmarked symbols on free list */ |
| 2017 | { |
| 2018 | register struct symbol_block *sblk; |
| 2019 | register int lim = symbol_block_index; |
| 2020 | register int num_free = 0, num_used = 0; |
| 2021 | |
| 2022 | symbol_free_list = 0; |
| 2023 | |
| 2024 | for (sblk = symbol_block; sblk; sblk = sblk->next) |
| 2025 | { |
| 2026 | register int i; |
| 2027 | for (i = 0; i < lim; i++) |
| 2028 | if (!XMARKBIT (sblk->symbols[i].plist)) |
| 2029 | { |
| 2030 | *(struct Lisp_Symbol **)&sblk->symbols[i].value = symbol_free_list; |
| 2031 | symbol_free_list = &sblk->symbols[i]; |
| 2032 | num_free++; |
| 2033 | } |
| 2034 | else |
| 2035 | { |
| 2036 | num_used++; |
| 2037 | sblk->symbols[i].name |
| 2038 | = XSTRING (*(Lisp_Object *) &sblk->symbols[i].name); |
| 2039 | XUNMARK (sblk->symbols[i].plist); |
| 2040 | } |
| 2041 | lim = SYMBOL_BLOCK_SIZE; |
| 2042 | } |
| 2043 | total_symbols = num_used; |
| 2044 | total_free_symbols = num_free; |
| 2045 | } |
| 2046 | |
| 2047 | #ifndef standalone |
| 2048 | /* Put all unmarked markers on free list. |
| 2049 | Dechain each one first from the buffer it points into, |
| 2050 | but only if it's a real marker. */ |
| 2051 | { |
| 2052 | register struct marker_block *mblk; |
| 2053 | register int lim = marker_block_index; |
| 2054 | register int num_free = 0, num_used = 0; |
| 2055 | |
| 2056 | marker_free_list = 0; |
| 2057 | |
| 2058 | for (mblk = marker_block; mblk; mblk = mblk->next) |
| 2059 | { |
| 2060 | register int i; |
| 2061 | EMACS_INT already_free = -1; |
| 2062 | |
| 2063 | for (i = 0; i < lim; i++) |
| 2064 | { |
| 2065 | Lisp_Object *markword; |
| 2066 | switch (mblk->markers[i].u_marker.type) |
| 2067 | { |
| 2068 | case Lisp_Misc_Marker: |
| 2069 | markword = &mblk->markers[i].u_marker.chain; |
| 2070 | break; |
| 2071 | case Lisp_Misc_Buffer_Local_Value: |
| 2072 | case Lisp_Misc_Some_Buffer_Local_Value: |
| 2073 | markword = &mblk->markers[i].u_buffer_local_value.car; |
| 2074 | break; |
| 2075 | case Lisp_Misc_Overlay: |
| 2076 | markword = &mblk->markers[i].u_overlay.plist; |
| 2077 | break; |
| 2078 | case Lisp_Misc_Free: |
| 2079 | /* If the object was already free, keep it |
| 2080 | on the free list. */ |
| 2081 | markword = &already_free; |
| 2082 | break; |
| 2083 | default: |
| 2084 | markword = 0; |
| 2085 | break; |
| 2086 | } |
| 2087 | if (markword && !XMARKBIT (*markword)) |
| 2088 | { |
| 2089 | Lisp_Object tem; |
| 2090 | if (mblk->markers[i].u_marker.type == Lisp_Misc_Marker) |
| 2091 | { |
| 2092 | /* tem1 avoids Sun compiler bug */ |
| 2093 | struct Lisp_Marker *tem1 = &mblk->markers[i].u_marker; |
| 2094 | XSETMARKER (tem, tem1); |
| 2095 | unchain_marker (tem); |
| 2096 | } |
| 2097 | /* Set the type of the freed object to Lisp_Misc_Free. |
| 2098 | We could leave the type alone, since nobody checks it, |
| 2099 | but this might catch bugs faster. */ |
| 2100 | mblk->markers[i].u_marker.type = Lisp_Misc_Free; |
| 2101 | mblk->markers[i].u_free.chain = marker_free_list; |
| 2102 | marker_free_list = &mblk->markers[i]; |
| 2103 | num_free++; |
| 2104 | } |
| 2105 | else |
| 2106 | { |
| 2107 | num_used++; |
| 2108 | if (markword) |
| 2109 | XUNMARK (*markword); |
| 2110 | } |
| 2111 | } |
| 2112 | lim = MARKER_BLOCK_SIZE; |
| 2113 | } |
| 2114 | |
| 2115 | total_markers = num_used; |
| 2116 | total_free_markers = num_free; |
| 2117 | } |
| 2118 | |
| 2119 | /* Free all unmarked buffers */ |
| 2120 | { |
| 2121 | register struct buffer *buffer = all_buffers, *prev = 0, *next; |
| 2122 | |
| 2123 | while (buffer) |
| 2124 | if (!XMARKBIT (buffer->name)) |
| 2125 | { |
| 2126 | if (prev) |
| 2127 | prev->next = buffer->next; |
| 2128 | else |
| 2129 | all_buffers = buffer->next; |
| 2130 | next = buffer->next; |
| 2131 | xfree (buffer); |
| 2132 | buffer = next; |
| 2133 | } |
| 2134 | else |
| 2135 | { |
| 2136 | XUNMARK (buffer->name); |
| 2137 | UNMARK_BALANCE_INTERVALS (BUF_INTERVALS (buffer)); |
| 2138 | |
| 2139 | #if 0 |
| 2140 | /* Each `struct Lisp_String *' was turned into a Lisp_Object |
| 2141 | for purposes of marking and relocation. |
| 2142 | Turn them back into C pointers now. */ |
| 2143 | buffer->upcase_table |
| 2144 | = XSTRING (*(Lisp_Object *)&buffer->upcase_table); |
| 2145 | buffer->downcase_table |
| 2146 | = XSTRING (*(Lisp_Object *)&buffer->downcase_table); |
| 2147 | buffer->sort_table |
| 2148 | = XSTRING (*(Lisp_Object *)&buffer->sort_table); |
| 2149 | buffer->folding_sort_table |
| 2150 | = XSTRING (*(Lisp_Object *)&buffer->folding_sort_table); |
| 2151 | #endif |
| 2152 | |
| 2153 | prev = buffer, buffer = buffer->next; |
| 2154 | } |
| 2155 | } |
| 2156 | |
| 2157 | #endif /* standalone */ |
| 2158 | |
| 2159 | /* Free all unmarked vectors */ |
| 2160 | { |
| 2161 | register struct Lisp_Vector *vector = all_vectors, *prev = 0, *next; |
| 2162 | total_vector_size = 0; |
| 2163 | |
| 2164 | while (vector) |
| 2165 | if (!(vector->size & ARRAY_MARK_FLAG)) |
| 2166 | { |
| 2167 | if (prev) |
| 2168 | prev->next = vector->next; |
| 2169 | else |
| 2170 | all_vectors = vector->next; |
| 2171 | next = vector->next; |
| 2172 | xfree (vector); |
| 2173 | vector = next; |
| 2174 | } |
| 2175 | else |
| 2176 | { |
| 2177 | vector->size &= ~ARRAY_MARK_FLAG; |
| 2178 | if (vector->size & PSEUDOVECTOR_FLAG) |
| 2179 | total_vector_size += (PSEUDOVECTOR_SIZE_MASK & vector->size); |
| 2180 | else |
| 2181 | total_vector_size += vector->size; |
| 2182 | prev = vector, vector = vector->next; |
| 2183 | } |
| 2184 | } |
| 2185 | |
| 2186 | /* Free all "large strings" not marked with ARRAY_MARK_FLAG. */ |
| 2187 | { |
| 2188 | register struct string_block *sb = large_string_blocks, *prev = 0, *next; |
| 2189 | struct Lisp_String *s; |
| 2190 | |
| 2191 | while (sb) |
| 2192 | { |
| 2193 | s = (struct Lisp_String *) &sb->chars[0]; |
| 2194 | if (s->size & ARRAY_MARK_FLAG) |
| 2195 | { |
| 2196 | ((struct Lisp_String *)(&sb->chars[0]))->size |
| 2197 | &= ~ARRAY_MARK_FLAG & ~MARKBIT; |
| 2198 | UNMARK_BALANCE_INTERVALS (s->intervals); |
| 2199 | total_string_size += ((struct Lisp_String *)(&sb->chars[0]))->size; |
| 2200 | prev = sb, sb = sb->next; |
| 2201 | } |
| 2202 | else |
| 2203 | { |
| 2204 | if (prev) |
| 2205 | prev->next = sb->next; |
| 2206 | else |
| 2207 | large_string_blocks = sb->next; |
| 2208 | next = sb->next; |
| 2209 | xfree (sb); |
| 2210 | sb = next; |
| 2211 | } |
| 2212 | } |
| 2213 | } |
| 2214 | } |
| 2215 | \f |
| 2216 | /* Compactify strings, relocate references, and free empty string blocks. */ |
| 2217 | |
| 2218 | static void |
| 2219 | compact_strings () |
| 2220 | { |
| 2221 | /* String block of old strings we are scanning. */ |
| 2222 | register struct string_block *from_sb; |
| 2223 | /* A preceding string block (or maybe the same one) |
| 2224 | where we are copying the still-live strings to. */ |
| 2225 | register struct string_block *to_sb; |
| 2226 | int pos; |
| 2227 | int to_pos; |
| 2228 | |
| 2229 | to_sb = first_string_block; |
| 2230 | to_pos = 0; |
| 2231 | |
| 2232 | /* Scan each existing string block sequentially, string by string. */ |
| 2233 | for (from_sb = first_string_block; from_sb; from_sb = from_sb->next) |
| 2234 | { |
| 2235 | pos = 0; |
| 2236 | /* POS is the index of the next string in the block. */ |
| 2237 | while (pos < from_sb->pos) |
| 2238 | { |
| 2239 | register struct Lisp_String *nextstr |
| 2240 | = (struct Lisp_String *) &from_sb->chars[pos]; |
| 2241 | |
| 2242 | register struct Lisp_String *newaddr; |
| 2243 | register EMACS_INT size = nextstr->size; |
| 2244 | |
| 2245 | /* NEXTSTR is the old address of the next string. |
| 2246 | Just skip it if it isn't marked. */ |
| 2247 | if (((EMACS_UINT) size & ~DONT_COPY_FLAG) > STRING_BLOCK_SIZE) |
| 2248 | { |
| 2249 | /* It is marked, so its size field is really a chain of refs. |
| 2250 | Find the end of the chain, where the actual size lives. */ |
| 2251 | while (((EMACS_UINT) size & ~DONT_COPY_FLAG) > STRING_BLOCK_SIZE) |
| 2252 | { |
| 2253 | if (size & DONT_COPY_FLAG) |
| 2254 | size ^= MARKBIT | DONT_COPY_FLAG; |
| 2255 | size = *(EMACS_INT *)size & ~MARKBIT; |
| 2256 | } |
| 2257 | |
| 2258 | total_string_size += size; |
| 2259 | |
| 2260 | /* If it won't fit in TO_SB, close it out, |
| 2261 | and move to the next sb. Keep doing so until |
| 2262 | TO_SB reaches a large enough, empty enough string block. |
| 2263 | We know that TO_SB cannot advance past FROM_SB here |
| 2264 | since FROM_SB is large enough to contain this string. |
| 2265 | Any string blocks skipped here |
| 2266 | will be patched out and freed later. */ |
| 2267 | while (to_pos + STRING_FULLSIZE (size) |
| 2268 | > max (to_sb->pos, STRING_BLOCK_SIZE)) |
| 2269 | { |
| 2270 | to_sb->pos = to_pos; |
| 2271 | to_sb = to_sb->next; |
| 2272 | to_pos = 0; |
| 2273 | } |
| 2274 | /* Compute new address of this string |
| 2275 | and update TO_POS for the space being used. */ |
| 2276 | newaddr = (struct Lisp_String *) &to_sb->chars[to_pos]; |
| 2277 | to_pos += STRING_FULLSIZE (size); |
| 2278 | |
| 2279 | /* Copy the string itself to the new place. */ |
| 2280 | if (nextstr != newaddr) |
| 2281 | bcopy (nextstr, newaddr, size + 1 + sizeof (EMACS_INT) |
| 2282 | + INTERVAL_PTR_SIZE); |
| 2283 | |
| 2284 | /* Go through NEXTSTR's chain of references |
| 2285 | and make each slot in the chain point to |
| 2286 | the new address of this string. */ |
| 2287 | size = newaddr->size; |
| 2288 | while (((EMACS_UINT) size & ~DONT_COPY_FLAG) > STRING_BLOCK_SIZE) |
| 2289 | { |
| 2290 | register Lisp_Object *objptr; |
| 2291 | if (size & DONT_COPY_FLAG) |
| 2292 | size ^= MARKBIT | DONT_COPY_FLAG; |
| 2293 | objptr = (Lisp_Object *)size; |
| 2294 | |
| 2295 | size = XFASTINT (*objptr) & ~MARKBIT; |
| 2296 | if (XMARKBIT (*objptr)) |
| 2297 | { |
| 2298 | XSETSTRING (*objptr, newaddr); |
| 2299 | XMARK (*objptr); |
| 2300 | } |
| 2301 | else |
| 2302 | XSETSTRING (*objptr, newaddr); |
| 2303 | } |
| 2304 | /* Store the actual size in the size field. */ |
| 2305 | newaddr->size = size; |
| 2306 | |
| 2307 | #ifdef USE_TEXT_PROPERTIES |
| 2308 | /* Now that the string has been relocated, rebalance its |
| 2309 | interval tree, and update the tree's parent pointer. */ |
| 2310 | if (! NULL_INTERVAL_P (newaddr->intervals)) |
| 2311 | { |
| 2312 | UNMARK_BALANCE_INTERVALS (newaddr->intervals); |
| 2313 | XSETSTRING (* (Lisp_Object *) &newaddr->intervals->parent, |
| 2314 | newaddr); |
| 2315 | } |
| 2316 | #endif /* USE_TEXT_PROPERTIES */ |
| 2317 | } |
| 2318 | pos += STRING_FULLSIZE (size); |
| 2319 | } |
| 2320 | } |
| 2321 | |
| 2322 | /* Close out the last string block still used and free any that follow. */ |
| 2323 | to_sb->pos = to_pos; |
| 2324 | current_string_block = to_sb; |
| 2325 | |
| 2326 | from_sb = to_sb->next; |
| 2327 | to_sb->next = 0; |
| 2328 | while (from_sb) |
| 2329 | { |
| 2330 | to_sb = from_sb->next; |
| 2331 | xfree (from_sb); |
| 2332 | from_sb = to_sb; |
| 2333 | } |
| 2334 | |
| 2335 | /* Free any empty string blocks further back in the chain. |
| 2336 | This loop will never free first_string_block, but it is very |
| 2337 | unlikely that that one will become empty, so why bother checking? */ |
| 2338 | |
| 2339 | from_sb = first_string_block; |
| 2340 | while (to_sb = from_sb->next) |
| 2341 | { |
| 2342 | if (to_sb->pos == 0) |
| 2343 | { |
| 2344 | if (from_sb->next = to_sb->next) |
| 2345 | from_sb->next->prev = from_sb; |
| 2346 | xfree (to_sb); |
| 2347 | } |
| 2348 | else |
| 2349 | from_sb = to_sb; |
| 2350 | } |
| 2351 | } |
| 2352 | \f |
| 2353 | /* Debugging aids. */ |
| 2354 | |
| 2355 | DEFUN ("memory-limit", Fmemory_limit, Smemory_limit, 0, 0, 0, |
| 2356 | "Return the address of the last byte Emacs has allocated, divided by 1024.\n\ |
| 2357 | This may be helpful in debugging Emacs's memory usage.\n\ |
| 2358 | We divide the value by 1024 to make sure it fits in a Lisp integer.") |
| 2359 | () |
| 2360 | { |
| 2361 | Lisp_Object end; |
| 2362 | |
| 2363 | XSETINT (end, (EMACS_INT) sbrk (0) / 1024); |
| 2364 | |
| 2365 | return end; |
| 2366 | } |
| 2367 | |
| 2368 | \f |
| 2369 | /* Initialization */ |
| 2370 | |
| 2371 | init_alloc_once () |
| 2372 | { |
| 2373 | /* Used to do Vpurify_flag = Qt here, but Qt isn't set up yet! */ |
| 2374 | pureptr = 0; |
| 2375 | #ifdef HAVE_SHM |
| 2376 | pure_size = PURESIZE; |
| 2377 | #endif |
| 2378 | all_vectors = 0; |
| 2379 | ignore_warnings = 1; |
| 2380 | init_strings (); |
| 2381 | init_cons (); |
| 2382 | init_symbol (); |
| 2383 | init_marker (); |
| 2384 | #ifdef LISP_FLOAT_TYPE |
| 2385 | init_float (); |
| 2386 | #endif /* LISP_FLOAT_TYPE */ |
| 2387 | INIT_INTERVALS; |
| 2388 | |
| 2389 | #ifdef REL_ALLOC |
| 2390 | malloc_hysteresis = 32; |
| 2391 | #else |
| 2392 | malloc_hysteresis = 0; |
| 2393 | #endif |
| 2394 | |
| 2395 | spare_memory = (char *) malloc (SPARE_MEMORY); |
| 2396 | |
| 2397 | ignore_warnings = 0; |
| 2398 | gcprolist = 0; |
| 2399 | staticidx = 0; |
| 2400 | consing_since_gc = 0; |
| 2401 | gc_cons_threshold = 300000; |
| 2402 | #ifdef VIRT_ADDR_VARIES |
| 2403 | malloc_sbrk_unused = 1<<22; /* A large number */ |
| 2404 | malloc_sbrk_used = 100000; /* as reasonable as any number */ |
| 2405 | #endif /* VIRT_ADDR_VARIES */ |
| 2406 | } |
| 2407 | |
| 2408 | init_alloc () |
| 2409 | { |
| 2410 | gcprolist = 0; |
| 2411 | } |
| 2412 | |
| 2413 | void |
| 2414 | syms_of_alloc () |
| 2415 | { |
| 2416 | DEFVAR_INT ("gc-cons-threshold", &gc_cons_threshold, |
| 2417 | "*Number of bytes of consing between garbage collections.\n\ |
| 2418 | Garbage collection can happen automatically once this many bytes have been\n\ |
| 2419 | allocated since the last garbage collection. All data types count.\n\n\ |
| 2420 | Garbage collection happens automatically only when `eval' is called.\n\n\ |
| 2421 | By binding this temporarily to a large number, you can effectively\n\ |
| 2422 | prevent garbage collection during a part of the program."); |
| 2423 | |
| 2424 | DEFVAR_INT ("pure-bytes-used", &pureptr, |
| 2425 | "Number of bytes of sharable Lisp data allocated so far."); |
| 2426 | |
| 2427 | #if 0 |
| 2428 | DEFVAR_INT ("data-bytes-used", &malloc_sbrk_used, |
| 2429 | "Number of bytes of unshared memory allocated in this session."); |
| 2430 | |
| 2431 | DEFVAR_INT ("data-bytes-free", &malloc_sbrk_unused, |
| 2432 | "Number of bytes of unshared memory remaining available in this session."); |
| 2433 | #endif |
| 2434 | |
| 2435 | DEFVAR_LISP ("purify-flag", &Vpurify_flag, |
| 2436 | "Non-nil means loading Lisp code in order to dump an executable.\n\ |
| 2437 | This means that certain objects should be allocated in shared (pure) space."); |
| 2438 | |
| 2439 | DEFVAR_INT ("undo-limit", &undo_limit, |
| 2440 | "Keep no more undo information once it exceeds this size.\n\ |
| 2441 | This limit is applied when garbage collection happens.\n\ |
| 2442 | The size is counted as the number of bytes occupied,\n\ |
| 2443 | which includes both saved text and other data."); |
| 2444 | undo_limit = 20000; |
| 2445 | |
| 2446 | DEFVAR_INT ("undo-strong-limit", &undo_strong_limit, |
| 2447 | "Don't keep more than this much size of undo information.\n\ |
| 2448 | A command which pushes past this size is itself forgotten.\n\ |
| 2449 | This limit is applied when garbage collection happens.\n\ |
| 2450 | The size is counted as the number of bytes occupied,\n\ |
| 2451 | which includes both saved text and other data."); |
| 2452 | undo_strong_limit = 30000; |
| 2453 | |
| 2454 | /* We build this in advance because if we wait until we need it, we might |
| 2455 | not be able to allocate the memory to hold it. */ |
| 2456 | memory_signal_data |
| 2457 | = Fcons (Qerror, Fcons (build_string ("Memory exhausted--use M-x save-some-buffers RET"), Qnil)); |
| 2458 | staticpro (&memory_signal_data); |
| 2459 | |
| 2460 | staticpro (&Qgc_cons_threshold); |
| 2461 | Qgc_cons_threshold = intern ("gc-cons-threshold"); |
| 2462 | |
| 2463 | defsubr (&Scons); |
| 2464 | defsubr (&Slist); |
| 2465 | defsubr (&Svector); |
| 2466 | defsubr (&Smake_byte_code); |
| 2467 | defsubr (&Smake_list); |
| 2468 | defsubr (&Smake_vector); |
| 2469 | defsubr (&Smake_string); |
| 2470 | defsubr (&Smake_symbol); |
| 2471 | defsubr (&Smake_marker); |
| 2472 | defsubr (&Spurecopy); |
| 2473 | defsubr (&Sgarbage_collect); |
| 2474 | defsubr (&Smemory_limit); |
| 2475 | } |