| 1 | /* Storage allocation and gc for GNU Emacs Lisp interpreter. |
| 2 | Copyright (C) 1985, 86, 88, 93, 94, 95, 97, 98, 1999, 2000 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | GNU Emacs is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GNU Emacs is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU Emacs; see the file COPYING. If not, write to |
| 19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include <config.h> |
| 23 | #include <stdio.h> |
| 24 | |
| 25 | /* Note that this declares bzero on OSF/1. How dumb. */ |
| 26 | |
| 27 | #include <signal.h> |
| 28 | |
| 29 | /* Define this temporarily to hunt a bug. If defined, the size of |
| 30 | strings is always recorded in sdata structures so that it can be |
| 31 | compared to the sizes recorded in Lisp strings. */ |
| 32 | |
| 33 | #define GC_CHECK_STRING_BYTES 1 |
| 34 | |
| 35 | /* This file is part of the core Lisp implementation, and thus must |
| 36 | deal with the real data structures. If the Lisp implementation is |
| 37 | replaced, this file likely will not be used. */ |
| 38 | |
| 39 | #undef HIDE_LISP_IMPLEMENTATION |
| 40 | #include "lisp.h" |
| 41 | #include "intervals.h" |
| 42 | #include "puresize.h" |
| 43 | #include "buffer.h" |
| 44 | #include "window.h" |
| 45 | #include "keyboard.h" |
| 46 | #include "frame.h" |
| 47 | #include "blockinput.h" |
| 48 | #include "charset.h" |
| 49 | #include "syssignal.h" |
| 50 | #include <setjmp.h> |
| 51 | |
| 52 | #ifdef HAVE_UNISTD_H |
| 53 | #include <unistd.h> |
| 54 | #else |
| 55 | extern POINTER_TYPE *sbrk (); |
| 56 | #endif |
| 57 | |
| 58 | #ifdef DOUG_LEA_MALLOC |
| 59 | |
| 60 | #include <malloc.h> |
| 61 | /* malloc.h #defines this as size_t, at least in glibc2. */ |
| 62 | #ifndef __malloc_size_t |
| 63 | #define __malloc_size_t int |
| 64 | #endif |
| 65 | |
| 66 | /* Specify maximum number of areas to mmap. It would be nice to use a |
| 67 | value that explicitly means "no limit". */ |
| 68 | |
| 69 | #define MMAP_MAX_AREAS 100000000 |
| 70 | |
| 71 | #else /* not DOUG_LEA_MALLOC */ |
| 72 | |
| 73 | /* The following come from gmalloc.c. */ |
| 74 | |
| 75 | #define __malloc_size_t size_t |
| 76 | extern __malloc_size_t _bytes_used; |
| 77 | extern __malloc_size_t __malloc_extra_blocks; |
| 78 | |
| 79 | #endif /* not DOUG_LEA_MALLOC */ |
| 80 | |
| 81 | #define max(A,B) ((A) > (B) ? (A) : (B)) |
| 82 | #define min(A,B) ((A) < (B) ? (A) : (B)) |
| 83 | |
| 84 | /* Macro to verify that storage intended for Lisp objects is not |
| 85 | out of range to fit in the space for a pointer. |
| 86 | ADDRESS is the start of the block, and SIZE |
| 87 | is the amount of space within which objects can start. */ |
| 88 | |
| 89 | #define VALIDATE_LISP_STORAGE(address, size) \ |
| 90 | do \ |
| 91 | { \ |
| 92 | Lisp_Object val; \ |
| 93 | XSETCONS (val, (char *) address + size); \ |
| 94 | if ((char *) XCONS (val) != (char *) address + size) \ |
| 95 | { \ |
| 96 | xfree (address); \ |
| 97 | memory_full (); \ |
| 98 | } \ |
| 99 | } while (0) |
| 100 | |
| 101 | /* Value of _bytes_used, when spare_memory was freed. */ |
| 102 | |
| 103 | static __malloc_size_t bytes_used_when_full; |
| 104 | |
| 105 | /* Mark, unmark, query mark bit of a Lisp string. S must be a pointer |
| 106 | to a struct Lisp_String. */ |
| 107 | |
| 108 | #define MARK_STRING(S) ((S)->size |= MARKBIT) |
| 109 | #define UNMARK_STRING(S) ((S)->size &= ~MARKBIT) |
| 110 | #define STRING_MARKED_P(S) ((S)->size & MARKBIT) |
| 111 | |
| 112 | /* Value is the number of bytes/chars of S, a pointer to a struct |
| 113 | Lisp_String. This must be used instead of STRING_BYTES (S) or |
| 114 | S->size during GC, because S->size contains the mark bit for |
| 115 | strings. */ |
| 116 | |
| 117 | #define GC_STRING_BYTES(S) (STRING_BYTES (S) & ~MARKBIT) |
| 118 | #define GC_STRING_CHARS(S) ((S)->size & ~MARKBIT) |
| 119 | |
| 120 | /* Number of bytes of consing done since the last gc. */ |
| 121 | |
| 122 | int consing_since_gc; |
| 123 | |
| 124 | /* Count the amount of consing of various sorts of space. */ |
| 125 | |
| 126 | int cons_cells_consed; |
| 127 | int floats_consed; |
| 128 | int vector_cells_consed; |
| 129 | int symbols_consed; |
| 130 | int string_chars_consed; |
| 131 | int misc_objects_consed; |
| 132 | int intervals_consed; |
| 133 | int strings_consed; |
| 134 | |
| 135 | /* Number of bytes of consing since GC before another GC should be done. */ |
| 136 | |
| 137 | int gc_cons_threshold; |
| 138 | |
| 139 | /* Nonzero during GC. */ |
| 140 | |
| 141 | int gc_in_progress; |
| 142 | |
| 143 | /* Nonzero means display messages at beginning and end of GC. */ |
| 144 | |
| 145 | int garbage_collection_messages; |
| 146 | |
| 147 | #ifndef VIRT_ADDR_VARIES |
| 148 | extern |
| 149 | #endif /* VIRT_ADDR_VARIES */ |
| 150 | int malloc_sbrk_used; |
| 151 | |
| 152 | #ifndef VIRT_ADDR_VARIES |
| 153 | extern |
| 154 | #endif /* VIRT_ADDR_VARIES */ |
| 155 | int malloc_sbrk_unused; |
| 156 | |
| 157 | /* Two limits controlling how much undo information to keep. */ |
| 158 | |
| 159 | int undo_limit; |
| 160 | int undo_strong_limit; |
| 161 | |
| 162 | /* Number of live and free conses etc. */ |
| 163 | |
| 164 | static int total_conses, total_markers, total_symbols, total_vector_size; |
| 165 | static int total_free_conses, total_free_markers, total_free_symbols; |
| 166 | static int total_free_floats, total_floats; |
| 167 | |
| 168 | /* Points to memory space allocated as "spare", to be freed if we run |
| 169 | out of memory. */ |
| 170 | |
| 171 | static char *spare_memory; |
| 172 | |
| 173 | /* Amount of spare memory to keep in reserve. */ |
| 174 | |
| 175 | #define SPARE_MEMORY (1 << 14) |
| 176 | |
| 177 | /* Number of extra blocks malloc should get when it needs more core. */ |
| 178 | |
| 179 | static int malloc_hysteresis; |
| 180 | |
| 181 | /* Non-nil means defun should do purecopy on the function definition. */ |
| 182 | |
| 183 | Lisp_Object Vpurify_flag; |
| 184 | |
| 185 | #ifndef HAVE_SHM |
| 186 | |
| 187 | /* Force it into data space! */ |
| 188 | |
| 189 | EMACS_INT pure[PURESIZE / sizeof (EMACS_INT)] = {0,}; |
| 190 | #define PUREBEG (char *) pure |
| 191 | |
| 192 | #else /* not HAVE_SHM */ |
| 193 | |
| 194 | #define pure PURE_SEG_BITS /* Use shared memory segment */ |
| 195 | #define PUREBEG (char *)PURE_SEG_BITS |
| 196 | |
| 197 | /* This variable is used only by the XPNTR macro when HAVE_SHM is |
| 198 | defined. If we used the PURESIZE macro directly there, that would |
| 199 | make most of Emacs dependent on puresize.h, which we don't want - |
| 200 | you should be able to change that without too much recompilation. |
| 201 | So map_in_data initializes pure_size, and the dependencies work |
| 202 | out. */ |
| 203 | |
| 204 | EMACS_INT pure_size; |
| 205 | |
| 206 | #endif /* not HAVE_SHM */ |
| 207 | |
| 208 | /* Value is non-zero if P points into pure space. */ |
| 209 | |
| 210 | #define PURE_POINTER_P(P) \ |
| 211 | (((PNTR_COMPARISON_TYPE) (P) \ |
| 212 | < (PNTR_COMPARISON_TYPE) ((char *) pure + PURESIZE)) \ |
| 213 | && ((PNTR_COMPARISON_TYPE) (P) \ |
| 214 | >= (PNTR_COMPARISON_TYPE) pure)) |
| 215 | |
| 216 | /* Index in pure at which next pure object will be allocated.. */ |
| 217 | |
| 218 | int pureptr; |
| 219 | |
| 220 | /* If nonzero, this is a warning delivered by malloc and not yet |
| 221 | displayed. */ |
| 222 | |
| 223 | char *pending_malloc_warning; |
| 224 | |
| 225 | /* Pre-computed signal argument for use when memory is exhausted. */ |
| 226 | |
| 227 | Lisp_Object memory_signal_data; |
| 228 | |
| 229 | /* Maximum amount of C stack to save when a GC happens. */ |
| 230 | |
| 231 | #ifndef MAX_SAVE_STACK |
| 232 | #define MAX_SAVE_STACK 16000 |
| 233 | #endif |
| 234 | |
| 235 | /* Buffer in which we save a copy of the C stack at each GC. */ |
| 236 | |
| 237 | char *stack_copy; |
| 238 | int stack_copy_size; |
| 239 | |
| 240 | /* Non-zero means ignore malloc warnings. Set during initialization. |
| 241 | Currently not used. */ |
| 242 | |
| 243 | int ignore_warnings; |
| 244 | |
| 245 | Lisp_Object Qgc_cons_threshold, Qchar_table_extra_slots; |
| 246 | |
| 247 | static void mark_buffer P_ ((Lisp_Object)); |
| 248 | static void mark_kboards P_ ((void)); |
| 249 | static void gc_sweep P_ ((void)); |
| 250 | static void mark_glyph_matrix P_ ((struct glyph_matrix *)); |
| 251 | static void mark_face_cache P_ ((struct face_cache *)); |
| 252 | |
| 253 | #ifdef HAVE_WINDOW_SYSTEM |
| 254 | static void mark_image P_ ((struct image *)); |
| 255 | static void mark_image_cache P_ ((struct frame *)); |
| 256 | #endif /* HAVE_WINDOW_SYSTEM */ |
| 257 | |
| 258 | static struct Lisp_String *allocate_string P_ ((void)); |
| 259 | static void compact_small_strings P_ ((void)); |
| 260 | static void free_large_strings P_ ((void)); |
| 261 | static void sweep_strings P_ ((void)); |
| 262 | |
| 263 | extern int message_enable_multibyte; |
| 264 | |
| 265 | /* When scanning the C stack for live Lisp objects, Emacs keeps track |
| 266 | of what memory allocated via lisp_malloc is intended for what |
| 267 | purpose. This enumeration specifies the type of memory. */ |
| 268 | |
| 269 | enum mem_type |
| 270 | { |
| 271 | MEM_TYPE_NON_LISP, |
| 272 | MEM_TYPE_BUFFER, |
| 273 | MEM_TYPE_CONS, |
| 274 | MEM_TYPE_STRING, |
| 275 | MEM_TYPE_MISC, |
| 276 | MEM_TYPE_SYMBOL, |
| 277 | MEM_TYPE_FLOAT, |
| 278 | MEM_TYPE_VECTOR |
| 279 | }; |
| 280 | |
| 281 | #if GC_MARK_STACK |
| 282 | |
| 283 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
| 284 | #include <stdio.h> /* For fprintf. */ |
| 285 | #endif |
| 286 | |
| 287 | /* A unique object in pure space used to make some Lisp objects |
| 288 | on free lists recognizable in O(1). */ |
| 289 | |
| 290 | Lisp_Object Vdead; |
| 291 | |
| 292 | struct mem_node; |
| 293 | static POINTER_TYPE *lisp_malloc P_ ((size_t, enum mem_type)); |
| 294 | static void lisp_free P_ ((POINTER_TYPE *)); |
| 295 | static void mark_stack P_ ((void)); |
| 296 | static void init_stack P_ ((Lisp_Object *)); |
| 297 | static int live_vector_p P_ ((struct mem_node *, void *)); |
| 298 | static int live_buffer_p P_ ((struct mem_node *, void *)); |
| 299 | static int live_string_p P_ ((struct mem_node *, void *)); |
| 300 | static int live_cons_p P_ ((struct mem_node *, void *)); |
| 301 | static int live_symbol_p P_ ((struct mem_node *, void *)); |
| 302 | static int live_float_p P_ ((struct mem_node *, void *)); |
| 303 | static int live_misc_p P_ ((struct mem_node *, void *)); |
| 304 | static void mark_maybe_object P_ ((Lisp_Object)); |
| 305 | static void mark_memory P_ ((void *, void *)); |
| 306 | static void mem_init P_ ((void)); |
| 307 | static struct mem_node *mem_insert P_ ((void *, void *, enum mem_type)); |
| 308 | static void mem_insert_fixup P_ ((struct mem_node *)); |
| 309 | static void mem_rotate_left P_ ((struct mem_node *)); |
| 310 | static void mem_rotate_right P_ ((struct mem_node *)); |
| 311 | static void mem_delete P_ ((struct mem_node *)); |
| 312 | static void mem_delete_fixup P_ ((struct mem_node *)); |
| 313 | static INLINE struct mem_node *mem_find P_ ((void *)); |
| 314 | |
| 315 | #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS |
| 316 | static void check_gcpros P_ ((void)); |
| 317 | #endif |
| 318 | |
| 319 | #endif /* GC_MARK_STACK != 0 */ |
| 320 | |
| 321 | \f |
| 322 | /************************************************************************ |
| 323 | Malloc |
| 324 | ************************************************************************/ |
| 325 | |
| 326 | /* Write STR to Vstandard_output plus some advice on how to free some |
| 327 | memory. Called when memory gets low. */ |
| 328 | |
| 329 | Lisp_Object |
| 330 | malloc_warning_1 (str) |
| 331 | Lisp_Object str; |
| 332 | { |
| 333 | Fprinc (str, Vstandard_output); |
| 334 | write_string ("\nKilling some buffers may delay running out of memory.\n", -1); |
| 335 | write_string ("However, certainly by the time you receive the 95% warning,\n", -1); |
| 336 | write_string ("you should clean up, kill this Emacs, and start a new one.", -1); |
| 337 | return Qnil; |
| 338 | } |
| 339 | |
| 340 | |
| 341 | /* Function malloc calls this if it finds we are near exhausting |
| 342 | storage. */ |
| 343 | |
| 344 | void |
| 345 | malloc_warning (str) |
| 346 | char *str; |
| 347 | { |
| 348 | pending_malloc_warning = str; |
| 349 | } |
| 350 | |
| 351 | |
| 352 | /* Display a malloc warning in buffer *Danger*. */ |
| 353 | |
| 354 | void |
| 355 | display_malloc_warning () |
| 356 | { |
| 357 | register Lisp_Object val; |
| 358 | |
| 359 | val = build_string (pending_malloc_warning); |
| 360 | pending_malloc_warning = 0; |
| 361 | internal_with_output_to_temp_buffer (" *Danger*", malloc_warning_1, val); |
| 362 | } |
| 363 | |
| 364 | |
| 365 | #ifdef DOUG_LEA_MALLOC |
| 366 | # define BYTES_USED (mallinfo ().arena) |
| 367 | #else |
| 368 | # define BYTES_USED _bytes_used |
| 369 | #endif |
| 370 | |
| 371 | |
| 372 | /* Called if malloc returns zero. */ |
| 373 | |
| 374 | void |
| 375 | memory_full () |
| 376 | { |
| 377 | #ifndef SYSTEM_MALLOC |
| 378 | bytes_used_when_full = BYTES_USED; |
| 379 | #endif |
| 380 | |
| 381 | /* The first time we get here, free the spare memory. */ |
| 382 | if (spare_memory) |
| 383 | { |
| 384 | free (spare_memory); |
| 385 | spare_memory = 0; |
| 386 | } |
| 387 | |
| 388 | /* This used to call error, but if we've run out of memory, we could |
| 389 | get infinite recursion trying to build the string. */ |
| 390 | while (1) |
| 391 | Fsignal (Qnil, memory_signal_data); |
| 392 | } |
| 393 | |
| 394 | |
| 395 | /* Called if we can't allocate relocatable space for a buffer. */ |
| 396 | |
| 397 | void |
| 398 | buffer_memory_full () |
| 399 | { |
| 400 | /* If buffers use the relocating allocator, no need to free |
| 401 | spare_memory, because we may have plenty of malloc space left |
| 402 | that we could get, and if we don't, the malloc that fails will |
| 403 | itself cause spare_memory to be freed. If buffers don't use the |
| 404 | relocating allocator, treat this like any other failing |
| 405 | malloc. */ |
| 406 | |
| 407 | #ifndef REL_ALLOC |
| 408 | memory_full (); |
| 409 | #endif |
| 410 | |
| 411 | /* This used to call error, but if we've run out of memory, we could |
| 412 | get infinite recursion trying to build the string. */ |
| 413 | while (1) |
| 414 | Fsignal (Qerror, memory_signal_data); |
| 415 | } |
| 416 | |
| 417 | |
| 418 | /* Like malloc but check for no memory and block interrupt input.. */ |
| 419 | |
| 420 | POINTER_TYPE * |
| 421 | xmalloc (size) |
| 422 | size_t size; |
| 423 | { |
| 424 | register POINTER_TYPE *val; |
| 425 | |
| 426 | BLOCK_INPUT; |
| 427 | val = (POINTER_TYPE *) malloc (size); |
| 428 | UNBLOCK_INPUT; |
| 429 | |
| 430 | if (!val && size) |
| 431 | memory_full (); |
| 432 | return val; |
| 433 | } |
| 434 | |
| 435 | |
| 436 | /* Like realloc but check for no memory and block interrupt input.. */ |
| 437 | |
| 438 | POINTER_TYPE * |
| 439 | xrealloc (block, size) |
| 440 | POINTER_TYPE *block; |
| 441 | size_t size; |
| 442 | { |
| 443 | register POINTER_TYPE *val; |
| 444 | |
| 445 | BLOCK_INPUT; |
| 446 | /* We must call malloc explicitly when BLOCK is 0, since some |
| 447 | reallocs don't do this. */ |
| 448 | if (! block) |
| 449 | val = (POINTER_TYPE *) malloc (size); |
| 450 | else |
| 451 | val = (POINTER_TYPE *) realloc (block, size); |
| 452 | UNBLOCK_INPUT; |
| 453 | |
| 454 | if (!val && size) memory_full (); |
| 455 | return val; |
| 456 | } |
| 457 | |
| 458 | |
| 459 | /* Like free but block interrupt input.. */ |
| 460 | |
| 461 | void |
| 462 | xfree (block) |
| 463 | POINTER_TYPE *block; |
| 464 | { |
| 465 | BLOCK_INPUT; |
| 466 | free (block); |
| 467 | UNBLOCK_INPUT; |
| 468 | } |
| 469 | |
| 470 | |
| 471 | /* Like strdup, but uses xmalloc. */ |
| 472 | |
| 473 | char * |
| 474 | xstrdup (s) |
| 475 | char *s; |
| 476 | { |
| 477 | size_t len = strlen (s) + 1; |
| 478 | char *p = (char *) xmalloc (len); |
| 479 | bcopy (s, p, len); |
| 480 | return p; |
| 481 | } |
| 482 | |
| 483 | |
| 484 | /* Like malloc but used for allocating Lisp data. NBYTES is the |
| 485 | number of bytes to allocate, TYPE describes the intended use of the |
| 486 | allcated memory block (for strings, for conses, ...). */ |
| 487 | |
| 488 | static POINTER_TYPE * |
| 489 | lisp_malloc (nbytes, type) |
| 490 | size_t nbytes; |
| 491 | enum mem_type type; |
| 492 | { |
| 493 | register void *val; |
| 494 | |
| 495 | BLOCK_INPUT; |
| 496 | val = (void *) malloc (nbytes); |
| 497 | |
| 498 | #if GC_MARK_STACK |
| 499 | if (val && type != MEM_TYPE_NON_LISP) |
| 500 | mem_insert (val, (char *) val + nbytes, type); |
| 501 | #endif |
| 502 | |
| 503 | UNBLOCK_INPUT; |
| 504 | if (!val && nbytes) |
| 505 | memory_full (); |
| 506 | return val; |
| 507 | } |
| 508 | |
| 509 | |
| 510 | /* Return a new buffer structure allocated from the heap with |
| 511 | a call to lisp_malloc. */ |
| 512 | |
| 513 | struct buffer * |
| 514 | allocate_buffer () |
| 515 | { |
| 516 | return (struct buffer *) lisp_malloc (sizeof (struct buffer), |
| 517 | MEM_TYPE_BUFFER); |
| 518 | } |
| 519 | |
| 520 | |
| 521 | /* Free BLOCK. This must be called to free memory allocated with a |
| 522 | call to lisp_malloc. */ |
| 523 | |
| 524 | static void |
| 525 | lisp_free (block) |
| 526 | POINTER_TYPE *block; |
| 527 | { |
| 528 | BLOCK_INPUT; |
| 529 | free (block); |
| 530 | #if GC_MARK_STACK |
| 531 | mem_delete (mem_find (block)); |
| 532 | #endif |
| 533 | UNBLOCK_INPUT; |
| 534 | } |
| 535 | |
| 536 | \f |
| 537 | /* Arranging to disable input signals while we're in malloc. |
| 538 | |
| 539 | This only works with GNU malloc. To help out systems which can't |
| 540 | use GNU malloc, all the calls to malloc, realloc, and free |
| 541 | elsewhere in the code should be inside a BLOCK_INPUT/UNBLOCK_INPUT |
| 542 | pairs; unfortunately, we have no idea what C library functions |
| 543 | might call malloc, so we can't really protect them unless you're |
| 544 | using GNU malloc. Fortunately, most of the major operating can use |
| 545 | GNU malloc. */ |
| 546 | |
| 547 | #ifndef SYSTEM_MALLOC |
| 548 | #ifndef DOUG_LEA_MALLOC |
| 549 | extern void * (*__malloc_hook) P_ ((size_t)); |
| 550 | extern void * (*__realloc_hook) P_ ((void *, size_t)); |
| 551 | extern void (*__free_hook) P_ ((void *)); |
| 552 | /* Else declared in malloc.h, perhaps with an extra arg. */ |
| 553 | #endif /* DOUG_LEA_MALLOC */ |
| 554 | static void * (*old_malloc_hook) (); |
| 555 | static void * (*old_realloc_hook) (); |
| 556 | static void (*old_free_hook) (); |
| 557 | |
| 558 | /* This function is used as the hook for free to call. */ |
| 559 | |
| 560 | static void |
| 561 | emacs_blocked_free (ptr) |
| 562 | void *ptr; |
| 563 | { |
| 564 | BLOCK_INPUT; |
| 565 | __free_hook = old_free_hook; |
| 566 | free (ptr); |
| 567 | /* If we released our reserve (due to running out of memory), |
| 568 | and we have a fair amount free once again, |
| 569 | try to set aside another reserve in case we run out once more. */ |
| 570 | if (spare_memory == 0 |
| 571 | /* Verify there is enough space that even with the malloc |
| 572 | hysteresis this call won't run out again. |
| 573 | The code here is correct as long as SPARE_MEMORY |
| 574 | is substantially larger than the block size malloc uses. */ |
| 575 | && (bytes_used_when_full |
| 576 | > BYTES_USED + max (malloc_hysteresis, 4) * SPARE_MEMORY)) |
| 577 | spare_memory = (char *) malloc ((size_t) SPARE_MEMORY); |
| 578 | |
| 579 | __free_hook = emacs_blocked_free; |
| 580 | UNBLOCK_INPUT; |
| 581 | } |
| 582 | |
| 583 | |
| 584 | /* If we released our reserve (due to running out of memory), |
| 585 | and we have a fair amount free once again, |
| 586 | try to set aside another reserve in case we run out once more. |
| 587 | |
| 588 | This is called when a relocatable block is freed in ralloc.c. */ |
| 589 | |
| 590 | void |
| 591 | refill_memory_reserve () |
| 592 | { |
| 593 | if (spare_memory == 0) |
| 594 | spare_memory = (char *) malloc ((size_t) SPARE_MEMORY); |
| 595 | } |
| 596 | |
| 597 | |
| 598 | /* This function is the malloc hook that Emacs uses. */ |
| 599 | |
| 600 | static void * |
| 601 | emacs_blocked_malloc (size) |
| 602 | size_t size; |
| 603 | { |
| 604 | void *value; |
| 605 | |
| 606 | BLOCK_INPUT; |
| 607 | __malloc_hook = old_malloc_hook; |
| 608 | #ifdef DOUG_LEA_MALLOC |
| 609 | mallopt (M_TOP_PAD, malloc_hysteresis * 4096); |
| 610 | #else |
| 611 | __malloc_extra_blocks = malloc_hysteresis; |
| 612 | #endif |
| 613 | value = (void *) malloc (size); |
| 614 | __malloc_hook = emacs_blocked_malloc; |
| 615 | UNBLOCK_INPUT; |
| 616 | |
| 617 | return value; |
| 618 | } |
| 619 | |
| 620 | |
| 621 | /* This function is the realloc hook that Emacs uses. */ |
| 622 | |
| 623 | static void * |
| 624 | emacs_blocked_realloc (ptr, size) |
| 625 | void *ptr; |
| 626 | size_t size; |
| 627 | { |
| 628 | void *value; |
| 629 | |
| 630 | BLOCK_INPUT; |
| 631 | __realloc_hook = old_realloc_hook; |
| 632 | value = (void *) realloc (ptr, size); |
| 633 | __realloc_hook = emacs_blocked_realloc; |
| 634 | UNBLOCK_INPUT; |
| 635 | |
| 636 | return value; |
| 637 | } |
| 638 | |
| 639 | |
| 640 | /* Called from main to set up malloc to use our hooks. */ |
| 641 | |
| 642 | void |
| 643 | uninterrupt_malloc () |
| 644 | { |
| 645 | if (__free_hook != emacs_blocked_free) |
| 646 | old_free_hook = __free_hook; |
| 647 | __free_hook = emacs_blocked_free; |
| 648 | |
| 649 | if (__malloc_hook != emacs_blocked_malloc) |
| 650 | old_malloc_hook = __malloc_hook; |
| 651 | __malloc_hook = emacs_blocked_malloc; |
| 652 | |
| 653 | if (__realloc_hook != emacs_blocked_realloc) |
| 654 | old_realloc_hook = __realloc_hook; |
| 655 | __realloc_hook = emacs_blocked_realloc; |
| 656 | } |
| 657 | |
| 658 | #endif /* not SYSTEM_MALLOC */ |
| 659 | |
| 660 | |
| 661 | \f |
| 662 | /*********************************************************************** |
| 663 | Interval Allocation |
| 664 | ***********************************************************************/ |
| 665 | |
| 666 | /* Number of intervals allocated in an interval_block structure. |
| 667 | The 1020 is 1024 minus malloc overhead. */ |
| 668 | |
| 669 | #define INTERVAL_BLOCK_SIZE \ |
| 670 | ((1020 - sizeof (struct interval_block *)) / sizeof (struct interval)) |
| 671 | |
| 672 | /* Intervals are allocated in chunks in form of an interval_block |
| 673 | structure. */ |
| 674 | |
| 675 | struct interval_block |
| 676 | { |
| 677 | struct interval_block *next; |
| 678 | struct interval intervals[INTERVAL_BLOCK_SIZE]; |
| 679 | }; |
| 680 | |
| 681 | /* Current interval block. Its `next' pointer points to older |
| 682 | blocks. */ |
| 683 | |
| 684 | struct interval_block *interval_block; |
| 685 | |
| 686 | /* Index in interval_block above of the next unused interval |
| 687 | structure. */ |
| 688 | |
| 689 | static int interval_block_index; |
| 690 | |
| 691 | /* Number of free and live intervals. */ |
| 692 | |
| 693 | static int total_free_intervals, total_intervals; |
| 694 | |
| 695 | /* List of free intervals. */ |
| 696 | |
| 697 | INTERVAL interval_free_list; |
| 698 | |
| 699 | /* Total number of interval blocks now in use. */ |
| 700 | |
| 701 | int n_interval_blocks; |
| 702 | |
| 703 | |
| 704 | /* Initialize interval allocation. */ |
| 705 | |
| 706 | static void |
| 707 | init_intervals () |
| 708 | { |
| 709 | interval_block |
| 710 | = (struct interval_block *) lisp_malloc (sizeof *interval_block, |
| 711 | MEM_TYPE_NON_LISP); |
| 712 | interval_block->next = 0; |
| 713 | bzero ((char *) interval_block->intervals, sizeof interval_block->intervals); |
| 714 | interval_block_index = 0; |
| 715 | interval_free_list = 0; |
| 716 | n_interval_blocks = 1; |
| 717 | } |
| 718 | |
| 719 | |
| 720 | /* Return a new interval. */ |
| 721 | |
| 722 | INTERVAL |
| 723 | make_interval () |
| 724 | { |
| 725 | INTERVAL val; |
| 726 | |
| 727 | if (interval_free_list) |
| 728 | { |
| 729 | val = interval_free_list; |
| 730 | interval_free_list = INTERVAL_PARENT (interval_free_list); |
| 731 | } |
| 732 | else |
| 733 | { |
| 734 | if (interval_block_index == INTERVAL_BLOCK_SIZE) |
| 735 | { |
| 736 | register struct interval_block *newi; |
| 737 | |
| 738 | newi = (struct interval_block *) lisp_malloc (sizeof *newi, |
| 739 | MEM_TYPE_NON_LISP); |
| 740 | |
| 741 | VALIDATE_LISP_STORAGE (newi, sizeof *newi); |
| 742 | newi->next = interval_block; |
| 743 | interval_block = newi; |
| 744 | interval_block_index = 0; |
| 745 | n_interval_blocks++; |
| 746 | } |
| 747 | val = &interval_block->intervals[interval_block_index++]; |
| 748 | } |
| 749 | consing_since_gc += sizeof (struct interval); |
| 750 | intervals_consed++; |
| 751 | RESET_INTERVAL (val); |
| 752 | return val; |
| 753 | } |
| 754 | |
| 755 | |
| 756 | /* Mark Lisp objects in interval I. */ |
| 757 | |
| 758 | static void |
| 759 | mark_interval (i, dummy) |
| 760 | register INTERVAL i; |
| 761 | Lisp_Object dummy; |
| 762 | { |
| 763 | if (XMARKBIT (i->plist)) |
| 764 | abort (); |
| 765 | mark_object (&i->plist); |
| 766 | XMARK (i->plist); |
| 767 | } |
| 768 | |
| 769 | |
| 770 | /* Mark the interval tree rooted in TREE. Don't call this directly; |
| 771 | use the macro MARK_INTERVAL_TREE instead. */ |
| 772 | |
| 773 | static void |
| 774 | mark_interval_tree (tree) |
| 775 | register INTERVAL tree; |
| 776 | { |
| 777 | /* No need to test if this tree has been marked already; this |
| 778 | function is always called through the MARK_INTERVAL_TREE macro, |
| 779 | which takes care of that. */ |
| 780 | |
| 781 | /* XMARK expands to an assignment; the LHS of an assignment can't be |
| 782 | a cast. */ |
| 783 | XMARK (tree->up.obj); |
| 784 | |
| 785 | traverse_intervals (tree, 1, 0, mark_interval, Qnil); |
| 786 | } |
| 787 | |
| 788 | |
| 789 | /* Mark the interval tree rooted in I. */ |
| 790 | |
| 791 | #define MARK_INTERVAL_TREE(i) \ |
| 792 | do { \ |
| 793 | if (!NULL_INTERVAL_P (i) \ |
| 794 | && ! XMARKBIT (i->up.obj)) \ |
| 795 | mark_interval_tree (i); \ |
| 796 | } while (0) |
| 797 | |
| 798 | |
| 799 | /* The oddity in the call to XUNMARK is necessary because XUNMARK |
| 800 | expands to an assignment to its argument, and most C compilers |
| 801 | don't support casts on the left operand of `='. */ |
| 802 | |
| 803 | #define UNMARK_BALANCE_INTERVALS(i) \ |
| 804 | do { \ |
| 805 | if (! NULL_INTERVAL_P (i)) \ |
| 806 | { \ |
| 807 | XUNMARK ((i)->up.obj); \ |
| 808 | (i) = balance_intervals (i); \ |
| 809 | } \ |
| 810 | } while (0) |
| 811 | |
| 812 | \f |
| 813 | /* Number support. If NO_UNION_TYPE isn't in effect, we |
| 814 | can't create number objects in macros. */ |
| 815 | #ifndef make_number |
| 816 | Lisp_Object |
| 817 | make_number (n) |
| 818 | int n; |
| 819 | { |
| 820 | Lisp_Object obj; |
| 821 | obj.s.val = n; |
| 822 | obj.s.type = Lisp_Int; |
| 823 | return obj; |
| 824 | } |
| 825 | #endif |
| 826 | \f |
| 827 | /*********************************************************************** |
| 828 | String Allocation |
| 829 | ***********************************************************************/ |
| 830 | |
| 831 | /* Lisp_Strings are allocated in string_block structures. When a new |
| 832 | string_block is allocated, all the Lisp_Strings it contains are |
| 833 | added to a free-list stiing_free_list. When a new Lisp_String is |
| 834 | needed, it is taken from that list. During the sweep phase of GC, |
| 835 | string_blocks that are entirely free are freed, except two which |
| 836 | we keep. |
| 837 | |
| 838 | String data is allocated from sblock structures. Strings larger |
| 839 | than LARGE_STRING_BYTES, get their own sblock, data for smaller |
| 840 | strings is sub-allocated out of sblocks of size SBLOCK_SIZE. |
| 841 | |
| 842 | Sblocks consist internally of sdata structures, one for each |
| 843 | Lisp_String. The sdata structure points to the Lisp_String it |
| 844 | belongs to. The Lisp_String points back to the `u.data' member of |
| 845 | its sdata structure. |
| 846 | |
| 847 | When a Lisp_String is freed during GC, it is put back on |
| 848 | string_free_list, and its `data' member and its sdata's `string' |
| 849 | pointer is set to null. The size of the string is recorded in the |
| 850 | `u.nbytes' member of the sdata. So, sdata structures that are no |
| 851 | longer used, can be easily recognized, and it's easy to compact the |
| 852 | sblocks of small strings which we do in compact_small_strings. */ |
| 853 | |
| 854 | /* Size in bytes of an sblock structure used for small strings. This |
| 855 | is 8192 minus malloc overhead. */ |
| 856 | |
| 857 | #define SBLOCK_SIZE 8188 |
| 858 | |
| 859 | /* Strings larger than this are considered large strings. String data |
| 860 | for large strings is allocated from individual sblocks. */ |
| 861 | |
| 862 | #define LARGE_STRING_BYTES 1024 |
| 863 | |
| 864 | /* Structure describing string memory sub-allocated from an sblock. |
| 865 | This is where the contents of Lisp strings are stored. */ |
| 866 | |
| 867 | struct sdata |
| 868 | { |
| 869 | /* Back-pointer to the string this sdata belongs to. If null, this |
| 870 | structure is free, and the NBYTES member of the union below |
| 871 | contains the string's byte size (the same value that STRING_BYTES |
| 872 | would return if STRING were non-null). If non-null, STRING_BYTES |
| 873 | (STRING) is the size of the data, and DATA contains the string's |
| 874 | contents. */ |
| 875 | struct Lisp_String *string; |
| 876 | |
| 877 | #ifdef GC_CHECK_STRING_BYTES |
| 878 | |
| 879 | EMACS_INT nbytes; |
| 880 | unsigned char data[1]; |
| 881 | |
| 882 | #define SDATA_NBYTES(S) (S)->nbytes |
| 883 | #define SDATA_DATA(S) (S)->data |
| 884 | |
| 885 | #else /* not GC_CHECK_STRING_BYTES */ |
| 886 | |
| 887 | union |
| 888 | { |
| 889 | /* When STRING in non-null. */ |
| 890 | unsigned char data[1]; |
| 891 | |
| 892 | /* When STRING is null. */ |
| 893 | EMACS_INT nbytes; |
| 894 | } u; |
| 895 | |
| 896 | |
| 897 | #define SDATA_NBYTES(S) (S)->u.nbytes |
| 898 | #define SDATA_DATA(S) (S)->u.data |
| 899 | |
| 900 | #endif /* not GC_CHECK_STRING_BYTES */ |
| 901 | }; |
| 902 | |
| 903 | |
| 904 | /* Structure describing a block of memory which is sub-allocated to |
| 905 | obtain string data memory for strings. Blocks for small strings |
| 906 | are of fixed size SBLOCK_SIZE. Blocks for large strings are made |
| 907 | as large as needed. */ |
| 908 | |
| 909 | struct sblock |
| 910 | { |
| 911 | /* Next in list. */ |
| 912 | struct sblock *next; |
| 913 | |
| 914 | /* Pointer to the next free sdata block. This points past the end |
| 915 | of the sblock if there isn't any space left in this block. */ |
| 916 | struct sdata *next_free; |
| 917 | |
| 918 | /* Start of data. */ |
| 919 | struct sdata first_data; |
| 920 | }; |
| 921 | |
| 922 | /* Number of Lisp strings in a string_block structure. The 1020 is |
| 923 | 1024 minus malloc overhead. */ |
| 924 | |
| 925 | #define STRINGS_IN_STRING_BLOCK \ |
| 926 | ((1020 - sizeof (struct string_block *)) / sizeof (struct Lisp_String)) |
| 927 | |
| 928 | /* Structure describing a block from which Lisp_String structures |
| 929 | are allocated. */ |
| 930 | |
| 931 | struct string_block |
| 932 | { |
| 933 | struct string_block *next; |
| 934 | struct Lisp_String strings[STRINGS_IN_STRING_BLOCK]; |
| 935 | }; |
| 936 | |
| 937 | /* Head and tail of the list of sblock structures holding Lisp string |
| 938 | data. We always allocate from current_sblock. The NEXT pointers |
| 939 | in the sblock structures go from oldest_sblock to current_sblock. */ |
| 940 | |
| 941 | static struct sblock *oldest_sblock, *current_sblock; |
| 942 | |
| 943 | /* List of sblocks for large strings. */ |
| 944 | |
| 945 | static struct sblock *large_sblocks; |
| 946 | |
| 947 | /* List of string_block structures, and how many there are. */ |
| 948 | |
| 949 | static struct string_block *string_blocks; |
| 950 | static int n_string_blocks; |
| 951 | |
| 952 | /* Free-list of Lisp_Strings. */ |
| 953 | |
| 954 | static struct Lisp_String *string_free_list; |
| 955 | |
| 956 | /* Number of live and free Lisp_Strings. */ |
| 957 | |
| 958 | static int total_strings, total_free_strings; |
| 959 | |
| 960 | /* Number of bytes used by live strings. */ |
| 961 | |
| 962 | static int total_string_size; |
| 963 | |
| 964 | /* Given a pointer to a Lisp_String S which is on the free-list |
| 965 | string_free_list, return a pointer to its successor in the |
| 966 | free-list. */ |
| 967 | |
| 968 | #define NEXT_FREE_LISP_STRING(S) (*(struct Lisp_String **) (S)) |
| 969 | |
| 970 | /* Return a pointer to the sdata structure belonging to Lisp string S. |
| 971 | S must be live, i.e. S->data must not be null. S->data is actually |
| 972 | a pointer to the `u.data' member of its sdata structure; the |
| 973 | structure starts at a constant offset in front of that. */ |
| 974 | |
| 975 | #ifdef GC_CHECK_STRING_BYTES |
| 976 | |
| 977 | #define SDATA_OF_STRING(S) \ |
| 978 | ((struct sdata *) ((S)->data - sizeof (struct Lisp_String *) \ |
| 979 | - sizeof (EMACS_INT))) |
| 980 | |
| 981 | #else /* not GC_CHECK_STRING_BYTES */ |
| 982 | |
| 983 | #define SDATA_OF_STRING(S) \ |
| 984 | ((struct sdata *) ((S)->data - sizeof (struct Lisp_String *))) |
| 985 | |
| 986 | #endif /* not GC_CHECK_STRING_BYTES */ |
| 987 | |
| 988 | /* Value is the size of an sdata structure large enough to hold NBYTES |
| 989 | bytes of string data. The value returned includes a terminating |
| 990 | NUL byte, the size of the sdata structure, and padding. */ |
| 991 | |
| 992 | #ifdef GC_CHECK_STRING_BYTES |
| 993 | |
| 994 | #define SDATA_SIZE(NBYTES) \ |
| 995 | ((sizeof (struct Lisp_String *) \ |
| 996 | + (NBYTES) + 1 \ |
| 997 | + sizeof (EMACS_INT) \ |
| 998 | + sizeof (EMACS_INT) - 1) \ |
| 999 | & ~(sizeof (EMACS_INT) - 1)) |
| 1000 | |
| 1001 | #else /* not GC_CHECK_STRING_BYTES */ |
| 1002 | |
| 1003 | #define SDATA_SIZE(NBYTES) \ |
| 1004 | ((sizeof (struct Lisp_String *) \ |
| 1005 | + (NBYTES) + 1 \ |
| 1006 | + sizeof (EMACS_INT) - 1) \ |
| 1007 | & ~(sizeof (EMACS_INT) - 1)) |
| 1008 | |
| 1009 | #endif /* not GC_CHECK_STRING_BYTES */ |
| 1010 | |
| 1011 | /* Initialize string allocation. Called from init_alloc_once. */ |
| 1012 | |
| 1013 | void |
| 1014 | init_strings () |
| 1015 | { |
| 1016 | total_strings = total_free_strings = total_string_size = 0; |
| 1017 | oldest_sblock = current_sblock = large_sblocks = NULL; |
| 1018 | string_blocks = NULL; |
| 1019 | n_string_blocks = 0; |
| 1020 | string_free_list = NULL; |
| 1021 | } |
| 1022 | |
| 1023 | |
| 1024 | /* Return a new Lisp_String. */ |
| 1025 | |
| 1026 | static struct Lisp_String * |
| 1027 | allocate_string () |
| 1028 | { |
| 1029 | struct Lisp_String *s; |
| 1030 | |
| 1031 | /* If the free-list is empty, allocate a new string_block, and |
| 1032 | add all the Lisp_Strings in it to the free-list. */ |
| 1033 | if (string_free_list == NULL) |
| 1034 | { |
| 1035 | struct string_block *b; |
| 1036 | int i; |
| 1037 | |
| 1038 | b = (struct string_block *) lisp_malloc (sizeof *b, MEM_TYPE_STRING); |
| 1039 | VALIDATE_LISP_STORAGE (b, sizeof *b); |
| 1040 | bzero (b, sizeof *b); |
| 1041 | b->next = string_blocks; |
| 1042 | string_blocks = b; |
| 1043 | ++n_string_blocks; |
| 1044 | |
| 1045 | for (i = STRINGS_IN_STRING_BLOCK - 1; i >= 0; --i) |
| 1046 | { |
| 1047 | s = b->strings + i; |
| 1048 | NEXT_FREE_LISP_STRING (s) = string_free_list; |
| 1049 | string_free_list = s; |
| 1050 | } |
| 1051 | |
| 1052 | total_free_strings += STRINGS_IN_STRING_BLOCK; |
| 1053 | } |
| 1054 | |
| 1055 | /* Pop a Lisp_String off the free-list. */ |
| 1056 | s = string_free_list; |
| 1057 | string_free_list = NEXT_FREE_LISP_STRING (s); |
| 1058 | |
| 1059 | /* Probably not strictly necessary, but play it safe. */ |
| 1060 | bzero (s, sizeof *s); |
| 1061 | |
| 1062 | --total_free_strings; |
| 1063 | ++total_strings; |
| 1064 | ++strings_consed; |
| 1065 | consing_since_gc += sizeof *s; |
| 1066 | |
| 1067 | return s; |
| 1068 | } |
| 1069 | |
| 1070 | |
| 1071 | /* Set up Lisp_String S for holding NCHARS characters, NBYTES bytes, |
| 1072 | plus a NUL byte at the end. Allocate an sdata structure for S, and |
| 1073 | set S->data to its `u.data' member. Store a NUL byte at the end of |
| 1074 | S->data. Set S->size to NCHARS and S->size_byte to NBYTES. Free |
| 1075 | S->data if it was initially non-null. */ |
| 1076 | |
| 1077 | void |
| 1078 | allocate_string_data (s, nchars, nbytes) |
| 1079 | struct Lisp_String *s; |
| 1080 | int nchars, nbytes; |
| 1081 | { |
| 1082 | struct sdata *data, *old_data; |
| 1083 | struct sblock *b; |
| 1084 | int needed, old_nbytes; |
| 1085 | |
| 1086 | /* Determine the number of bytes needed to store NBYTES bytes |
| 1087 | of string data. */ |
| 1088 | needed = SDATA_SIZE (nbytes); |
| 1089 | |
| 1090 | if (nbytes > LARGE_STRING_BYTES) |
| 1091 | { |
| 1092 | size_t size = sizeof *b - sizeof (struct sdata) + needed; |
| 1093 | |
| 1094 | #ifdef DOUG_LEA_MALLOC |
| 1095 | /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed |
| 1096 | because mapped region contents are not preserved in |
| 1097 | a dumped Emacs. */ |
| 1098 | mallopt (M_MMAP_MAX, 0); |
| 1099 | #endif |
| 1100 | |
| 1101 | b = (struct sblock *) lisp_malloc (size, MEM_TYPE_NON_LISP); |
| 1102 | |
| 1103 | #ifdef DOUG_LEA_MALLOC |
| 1104 | /* Back to a reasonable maximum of mmap'ed areas. */ |
| 1105 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); |
| 1106 | #endif |
| 1107 | |
| 1108 | b->next_free = &b->first_data; |
| 1109 | b->first_data.string = NULL; |
| 1110 | b->next = large_sblocks; |
| 1111 | large_sblocks = b; |
| 1112 | } |
| 1113 | else if (current_sblock == NULL |
| 1114 | || (((char *) current_sblock + SBLOCK_SIZE |
| 1115 | - (char *) current_sblock->next_free) |
| 1116 | < needed)) |
| 1117 | { |
| 1118 | /* Not enough room in the current sblock. */ |
| 1119 | b = (struct sblock *) lisp_malloc (SBLOCK_SIZE, MEM_TYPE_NON_LISP); |
| 1120 | b->next_free = &b->first_data; |
| 1121 | b->first_data.string = NULL; |
| 1122 | b->next = NULL; |
| 1123 | |
| 1124 | if (current_sblock) |
| 1125 | current_sblock->next = b; |
| 1126 | else |
| 1127 | oldest_sblock = b; |
| 1128 | current_sblock = b; |
| 1129 | } |
| 1130 | else |
| 1131 | b = current_sblock; |
| 1132 | |
| 1133 | old_data = s->data ? SDATA_OF_STRING (s) : NULL; |
| 1134 | old_nbytes = GC_STRING_BYTES (s); |
| 1135 | |
| 1136 | data = b->next_free; |
| 1137 | data->string = s; |
| 1138 | s->data = SDATA_DATA (data); |
| 1139 | #ifdef GC_CHECK_STRING_BYTES |
| 1140 | SDATA_NBYTES (data) = nbytes; |
| 1141 | #endif |
| 1142 | s->size = nchars; |
| 1143 | s->size_byte = nbytes; |
| 1144 | s->data[nbytes] = '\0'; |
| 1145 | b->next_free = (struct sdata *) ((char *) data + needed); |
| 1146 | |
| 1147 | /* If S had already data assigned, mark that as free by setting its |
| 1148 | string back-pointer to null, and recording the size of the data |
| 1149 | in it. */ |
| 1150 | if (old_data) |
| 1151 | { |
| 1152 | SDATA_NBYTES (old_data) = old_nbytes; |
| 1153 | old_data->string = NULL; |
| 1154 | } |
| 1155 | |
| 1156 | consing_since_gc += needed; |
| 1157 | } |
| 1158 | |
| 1159 | |
| 1160 | /* Sweep and compact strings. */ |
| 1161 | |
| 1162 | static void |
| 1163 | sweep_strings () |
| 1164 | { |
| 1165 | struct string_block *b, *next; |
| 1166 | struct string_block *live_blocks = NULL; |
| 1167 | |
| 1168 | string_free_list = NULL; |
| 1169 | total_strings = total_free_strings = 0; |
| 1170 | total_string_size = 0; |
| 1171 | |
| 1172 | /* Scan strings_blocks, free Lisp_Strings that aren't marked. */ |
| 1173 | for (b = string_blocks; b; b = next) |
| 1174 | { |
| 1175 | int i, nfree = 0; |
| 1176 | struct Lisp_String *free_list_before = string_free_list; |
| 1177 | |
| 1178 | next = b->next; |
| 1179 | |
| 1180 | for (i = 0; i < STRINGS_IN_STRING_BLOCK; ++i) |
| 1181 | { |
| 1182 | struct Lisp_String *s = b->strings + i; |
| 1183 | |
| 1184 | if (s->data) |
| 1185 | { |
| 1186 | /* String was not on free-list before. */ |
| 1187 | if (STRING_MARKED_P (s)) |
| 1188 | { |
| 1189 | /* String is live; unmark it and its intervals. */ |
| 1190 | UNMARK_STRING (s); |
| 1191 | |
| 1192 | if (!NULL_INTERVAL_P (s->intervals)) |
| 1193 | UNMARK_BALANCE_INTERVALS (s->intervals); |
| 1194 | |
| 1195 | ++total_strings; |
| 1196 | total_string_size += STRING_BYTES (s); |
| 1197 | } |
| 1198 | else |
| 1199 | { |
| 1200 | /* String is dead. Put it on the free-list. */ |
| 1201 | struct sdata *data = SDATA_OF_STRING (s); |
| 1202 | |
| 1203 | /* Save the size of S in its sdata so that we know |
| 1204 | how large that is. Reset the sdata's string |
| 1205 | back-pointer so that we know it's free. */ |
| 1206 | #ifdef GC_CHECK_STRING_BYTES |
| 1207 | if (GC_STRING_BYTES (s) != SDATA_NBYTES (data)) |
| 1208 | abort (); |
| 1209 | #else |
| 1210 | data->u.nbytes = GC_STRING_BYTES (s); |
| 1211 | #endif |
| 1212 | data->string = NULL; |
| 1213 | |
| 1214 | /* Reset the strings's `data' member so that we |
| 1215 | know it's free. */ |
| 1216 | s->data = NULL; |
| 1217 | |
| 1218 | /* Put the string on the free-list. */ |
| 1219 | NEXT_FREE_LISP_STRING (s) = string_free_list; |
| 1220 | string_free_list = s; |
| 1221 | ++nfree; |
| 1222 | } |
| 1223 | } |
| 1224 | else |
| 1225 | { |
| 1226 | /* S was on the free-list before. Put it there again. */ |
| 1227 | NEXT_FREE_LISP_STRING (s) = string_free_list; |
| 1228 | string_free_list = s; |
| 1229 | ++nfree; |
| 1230 | } |
| 1231 | } |
| 1232 | |
| 1233 | /* Free blocks that contain free Lisp_Strings only, except |
| 1234 | the first two of them. */ |
| 1235 | if (nfree == STRINGS_IN_STRING_BLOCK |
| 1236 | && total_free_strings > STRINGS_IN_STRING_BLOCK) |
| 1237 | { |
| 1238 | lisp_free (b); |
| 1239 | --n_string_blocks; |
| 1240 | string_free_list = free_list_before; |
| 1241 | } |
| 1242 | else |
| 1243 | { |
| 1244 | total_free_strings += nfree; |
| 1245 | b->next = live_blocks; |
| 1246 | live_blocks = b; |
| 1247 | } |
| 1248 | } |
| 1249 | |
| 1250 | string_blocks = live_blocks; |
| 1251 | free_large_strings (); |
| 1252 | compact_small_strings (); |
| 1253 | } |
| 1254 | |
| 1255 | |
| 1256 | /* Free dead large strings. */ |
| 1257 | |
| 1258 | static void |
| 1259 | free_large_strings () |
| 1260 | { |
| 1261 | struct sblock *b, *next; |
| 1262 | struct sblock *live_blocks = NULL; |
| 1263 | |
| 1264 | for (b = large_sblocks; b; b = next) |
| 1265 | { |
| 1266 | next = b->next; |
| 1267 | |
| 1268 | if (b->first_data.string == NULL) |
| 1269 | lisp_free (b); |
| 1270 | else |
| 1271 | { |
| 1272 | b->next = live_blocks; |
| 1273 | live_blocks = b; |
| 1274 | } |
| 1275 | } |
| 1276 | |
| 1277 | large_sblocks = live_blocks; |
| 1278 | } |
| 1279 | |
| 1280 | |
| 1281 | /* Compact data of small strings. Free sblocks that don't contain |
| 1282 | data of live strings after compaction. */ |
| 1283 | |
| 1284 | static void |
| 1285 | compact_small_strings () |
| 1286 | { |
| 1287 | struct sblock *b, *tb, *next; |
| 1288 | struct sdata *from, *to, *end, *tb_end; |
| 1289 | struct sdata *to_end, *from_end; |
| 1290 | |
| 1291 | /* TB is the sblock we copy to, TO is the sdata within TB we copy |
| 1292 | to, and TB_END is the end of TB. */ |
| 1293 | tb = oldest_sblock; |
| 1294 | tb_end = (struct sdata *) ((char *) tb + SBLOCK_SIZE); |
| 1295 | to = &tb->first_data; |
| 1296 | |
| 1297 | /* Step through the blocks from the oldest to the youngest. We |
| 1298 | expect that old blocks will stabilize over time, so that less |
| 1299 | copying will happen this way. */ |
| 1300 | for (b = oldest_sblock; b; b = b->next) |
| 1301 | { |
| 1302 | end = b->next_free; |
| 1303 | xassert ((char *) end <= (char *) b + SBLOCK_SIZE); |
| 1304 | |
| 1305 | for (from = &b->first_data; from < end; from = from_end) |
| 1306 | { |
| 1307 | /* Compute the next FROM here because copying below may |
| 1308 | overwrite data we need to compute it. */ |
| 1309 | int nbytes; |
| 1310 | |
| 1311 | #ifdef GC_CHECK_STRING_BYTES |
| 1312 | /* Check that the string size recorded in the string is the |
| 1313 | same as the one recorded in the sdata structure. */ |
| 1314 | if (from->string |
| 1315 | && GC_STRING_BYTES (from->string) != SDATA_NBYTES (from)) |
| 1316 | abort (); |
| 1317 | #endif /* GC_CHECK_STRING_BYTES */ |
| 1318 | |
| 1319 | if (from->string) |
| 1320 | nbytes = GC_STRING_BYTES (from->string); |
| 1321 | else |
| 1322 | nbytes = SDATA_NBYTES (from); |
| 1323 | |
| 1324 | nbytes = SDATA_SIZE (nbytes); |
| 1325 | from_end = (struct sdata *) ((char *) from + nbytes); |
| 1326 | |
| 1327 | /* FROM->string non-null means it's alive. Copy its data. */ |
| 1328 | if (from->string) |
| 1329 | { |
| 1330 | /* If TB is full, proceed with the next sblock. */ |
| 1331 | to_end = (struct sdata *) ((char *) to + nbytes); |
| 1332 | if (to_end > tb_end) |
| 1333 | { |
| 1334 | tb->next_free = to; |
| 1335 | tb = tb->next; |
| 1336 | tb_end = (struct sdata *) ((char *) tb + SBLOCK_SIZE); |
| 1337 | to = &tb->first_data; |
| 1338 | to_end = (struct sdata *) ((char *) to + nbytes); |
| 1339 | } |
| 1340 | |
| 1341 | /* Copy, and update the string's `data' pointer. */ |
| 1342 | if (from != to) |
| 1343 | { |
| 1344 | xassert (tb != b || to <= from); |
| 1345 | safe_bcopy ((char *) from, (char *) to, nbytes); |
| 1346 | to->string->data = SDATA_DATA (to); |
| 1347 | } |
| 1348 | |
| 1349 | /* Advance past the sdata we copied to. */ |
| 1350 | to = to_end; |
| 1351 | } |
| 1352 | } |
| 1353 | } |
| 1354 | |
| 1355 | /* The rest of the sblocks following TB don't contain live data, so |
| 1356 | we can free them. */ |
| 1357 | for (b = tb->next; b; b = next) |
| 1358 | { |
| 1359 | next = b->next; |
| 1360 | lisp_free (b); |
| 1361 | } |
| 1362 | |
| 1363 | tb->next_free = to; |
| 1364 | tb->next = NULL; |
| 1365 | current_sblock = tb; |
| 1366 | } |
| 1367 | |
| 1368 | |
| 1369 | DEFUN ("make-string", Fmake_string, Smake_string, 2, 2, 0, |
| 1370 | "Return a newly created string of length LENGTH, with each element being INIT.\n\ |
| 1371 | Both LENGTH and INIT must be numbers.") |
| 1372 | (length, init) |
| 1373 | Lisp_Object length, init; |
| 1374 | { |
| 1375 | register Lisp_Object val; |
| 1376 | register unsigned char *p, *end; |
| 1377 | int c, nbytes; |
| 1378 | |
| 1379 | CHECK_NATNUM (length, 0); |
| 1380 | CHECK_NUMBER (init, 1); |
| 1381 | |
| 1382 | c = XINT (init); |
| 1383 | if (SINGLE_BYTE_CHAR_P (c)) |
| 1384 | { |
| 1385 | nbytes = XINT (length); |
| 1386 | val = make_uninit_string (nbytes); |
| 1387 | p = XSTRING (val)->data; |
| 1388 | end = p + XSTRING (val)->size; |
| 1389 | while (p != end) |
| 1390 | *p++ = c; |
| 1391 | } |
| 1392 | else |
| 1393 | { |
| 1394 | unsigned char str[4]; |
| 1395 | int len = CHAR_STRING (c, str); |
| 1396 | |
| 1397 | nbytes = len * XINT (length); |
| 1398 | val = make_uninit_multibyte_string (XINT (length), nbytes); |
| 1399 | p = XSTRING (val)->data; |
| 1400 | end = p + nbytes; |
| 1401 | while (p != end) |
| 1402 | { |
| 1403 | bcopy (str, p, len); |
| 1404 | p += len; |
| 1405 | } |
| 1406 | } |
| 1407 | |
| 1408 | *p = 0; |
| 1409 | return val; |
| 1410 | } |
| 1411 | |
| 1412 | |
| 1413 | DEFUN ("make-bool-vector", Fmake_bool_vector, Smake_bool_vector, 2, 2, 0, |
| 1414 | "Return a new bool-vector of length LENGTH, using INIT for as each element.\n\ |
| 1415 | LENGTH must be a number. INIT matters only in whether it is t or nil.") |
| 1416 | (length, init) |
| 1417 | Lisp_Object length, init; |
| 1418 | { |
| 1419 | register Lisp_Object val; |
| 1420 | struct Lisp_Bool_Vector *p; |
| 1421 | int real_init, i; |
| 1422 | int length_in_chars, length_in_elts, bits_per_value; |
| 1423 | |
| 1424 | CHECK_NATNUM (length, 0); |
| 1425 | |
| 1426 | bits_per_value = sizeof (EMACS_INT) * BITS_PER_CHAR; |
| 1427 | |
| 1428 | length_in_elts = (XFASTINT (length) + bits_per_value - 1) / bits_per_value; |
| 1429 | length_in_chars = ((XFASTINT (length) + BITS_PER_CHAR - 1) / BITS_PER_CHAR); |
| 1430 | |
| 1431 | /* We must allocate one more elements than LENGTH_IN_ELTS for the |
| 1432 | slot `size' of the struct Lisp_Bool_Vector. */ |
| 1433 | val = Fmake_vector (make_number (length_in_elts + 1), Qnil); |
| 1434 | p = XBOOL_VECTOR (val); |
| 1435 | |
| 1436 | /* Get rid of any bits that would cause confusion. */ |
| 1437 | p->vector_size = 0; |
| 1438 | XSETBOOL_VECTOR (val, p); |
| 1439 | p->size = XFASTINT (length); |
| 1440 | |
| 1441 | real_init = (NILP (init) ? 0 : -1); |
| 1442 | for (i = 0; i < length_in_chars ; i++) |
| 1443 | p->data[i] = real_init; |
| 1444 | |
| 1445 | /* Clear the extraneous bits in the last byte. */ |
| 1446 | if (XINT (length) != length_in_chars * BITS_PER_CHAR) |
| 1447 | XBOOL_VECTOR (val)->data[length_in_chars - 1] |
| 1448 | &= (1 << (XINT (length) % BITS_PER_CHAR)) - 1; |
| 1449 | |
| 1450 | return val; |
| 1451 | } |
| 1452 | |
| 1453 | |
| 1454 | /* Make a string from NBYTES bytes at CONTENTS, and compute the number |
| 1455 | of characters from the contents. This string may be unibyte or |
| 1456 | multibyte, depending on the contents. */ |
| 1457 | |
| 1458 | Lisp_Object |
| 1459 | make_string (contents, nbytes) |
| 1460 | char *contents; |
| 1461 | int nbytes; |
| 1462 | { |
| 1463 | register Lisp_Object val; |
| 1464 | int nchars, multibyte_nbytes; |
| 1465 | |
| 1466 | parse_str_as_multibyte (contents, nbytes, &nchars, &multibyte_nbytes); |
| 1467 | val = make_uninit_multibyte_string (nchars, nbytes); |
| 1468 | bcopy (contents, XSTRING (val)->data, nbytes); |
| 1469 | if (nbytes == nchars || nbytes != multibyte_nbytes) |
| 1470 | /* CONTENTS contains no multibyte sequences or contains an invalid |
| 1471 | multibyte sequence. We must make unibyte string. */ |
| 1472 | SET_STRING_BYTES (XSTRING (val), -1); |
| 1473 | return val; |
| 1474 | } |
| 1475 | |
| 1476 | |
| 1477 | /* Make an unibyte string from LENGTH bytes at CONTENTS. */ |
| 1478 | |
| 1479 | Lisp_Object |
| 1480 | make_unibyte_string (contents, length) |
| 1481 | char *contents; |
| 1482 | int length; |
| 1483 | { |
| 1484 | register Lisp_Object val; |
| 1485 | val = make_uninit_string (length); |
| 1486 | bcopy (contents, XSTRING (val)->data, length); |
| 1487 | SET_STRING_BYTES (XSTRING (val), -1); |
| 1488 | return val; |
| 1489 | } |
| 1490 | |
| 1491 | |
| 1492 | /* Make a multibyte string from NCHARS characters occupying NBYTES |
| 1493 | bytes at CONTENTS. */ |
| 1494 | |
| 1495 | Lisp_Object |
| 1496 | make_multibyte_string (contents, nchars, nbytes) |
| 1497 | char *contents; |
| 1498 | int nchars, nbytes; |
| 1499 | { |
| 1500 | register Lisp_Object val; |
| 1501 | val = make_uninit_multibyte_string (nchars, nbytes); |
| 1502 | bcopy (contents, XSTRING (val)->data, nbytes); |
| 1503 | return val; |
| 1504 | } |
| 1505 | |
| 1506 | |
| 1507 | /* Make a string from NCHARS characters occupying NBYTES bytes at |
| 1508 | CONTENTS. It is a multibyte string if NBYTES != NCHARS. */ |
| 1509 | |
| 1510 | Lisp_Object |
| 1511 | make_string_from_bytes (contents, nchars, nbytes) |
| 1512 | char *contents; |
| 1513 | int nchars, nbytes; |
| 1514 | { |
| 1515 | register Lisp_Object val; |
| 1516 | val = make_uninit_multibyte_string (nchars, nbytes); |
| 1517 | bcopy (contents, XSTRING (val)->data, nbytes); |
| 1518 | if (STRING_BYTES (XSTRING (val)) == XSTRING (val)->size) |
| 1519 | SET_STRING_BYTES (XSTRING (val), -1); |
| 1520 | return val; |
| 1521 | } |
| 1522 | |
| 1523 | |
| 1524 | /* Make a string from NCHARS characters occupying NBYTES bytes at |
| 1525 | CONTENTS. The argument MULTIBYTE controls whether to label the |
| 1526 | string as multibyte. */ |
| 1527 | |
| 1528 | Lisp_Object |
| 1529 | make_specified_string (contents, nchars, nbytes, multibyte) |
| 1530 | char *contents; |
| 1531 | int nchars, nbytes; |
| 1532 | int multibyte; |
| 1533 | { |
| 1534 | register Lisp_Object val; |
| 1535 | val = make_uninit_multibyte_string (nchars, nbytes); |
| 1536 | bcopy (contents, XSTRING (val)->data, nbytes); |
| 1537 | if (!multibyte) |
| 1538 | SET_STRING_BYTES (XSTRING (val), -1); |
| 1539 | return val; |
| 1540 | } |
| 1541 | |
| 1542 | |
| 1543 | /* Make a string from the data at STR, treating it as multibyte if the |
| 1544 | data warrants. */ |
| 1545 | |
| 1546 | Lisp_Object |
| 1547 | build_string (str) |
| 1548 | char *str; |
| 1549 | { |
| 1550 | return make_string (str, strlen (str)); |
| 1551 | } |
| 1552 | |
| 1553 | |
| 1554 | /* Return an unibyte Lisp_String set up to hold LENGTH characters |
| 1555 | occupying LENGTH bytes. */ |
| 1556 | |
| 1557 | Lisp_Object |
| 1558 | make_uninit_string (length) |
| 1559 | int length; |
| 1560 | { |
| 1561 | Lisp_Object val; |
| 1562 | val = make_uninit_multibyte_string (length, length); |
| 1563 | SET_STRING_BYTES (XSTRING (val), -1); |
| 1564 | return val; |
| 1565 | } |
| 1566 | |
| 1567 | |
| 1568 | /* Return a multibyte Lisp_String set up to hold NCHARS characters |
| 1569 | which occupy NBYTES bytes. */ |
| 1570 | |
| 1571 | Lisp_Object |
| 1572 | make_uninit_multibyte_string (nchars, nbytes) |
| 1573 | int nchars, nbytes; |
| 1574 | { |
| 1575 | Lisp_Object string; |
| 1576 | struct Lisp_String *s; |
| 1577 | |
| 1578 | if (nchars < 0) |
| 1579 | abort (); |
| 1580 | |
| 1581 | s = allocate_string (); |
| 1582 | allocate_string_data (s, nchars, nbytes); |
| 1583 | XSETSTRING (string, s); |
| 1584 | string_chars_consed += nbytes; |
| 1585 | return string; |
| 1586 | } |
| 1587 | |
| 1588 | |
| 1589 | \f |
| 1590 | /*********************************************************************** |
| 1591 | Float Allocation |
| 1592 | ***********************************************************************/ |
| 1593 | |
| 1594 | /* We store float cells inside of float_blocks, allocating a new |
| 1595 | float_block with malloc whenever necessary. Float cells reclaimed |
| 1596 | by GC are put on a free list to be reallocated before allocating |
| 1597 | any new float cells from the latest float_block. |
| 1598 | |
| 1599 | Each float_block is just under 1020 bytes long, since malloc really |
| 1600 | allocates in units of powers of two and uses 4 bytes for its own |
| 1601 | overhead. */ |
| 1602 | |
| 1603 | #define FLOAT_BLOCK_SIZE \ |
| 1604 | ((1020 - sizeof (struct float_block *)) / sizeof (struct Lisp_Float)) |
| 1605 | |
| 1606 | struct float_block |
| 1607 | { |
| 1608 | struct float_block *next; |
| 1609 | struct Lisp_Float floats[FLOAT_BLOCK_SIZE]; |
| 1610 | }; |
| 1611 | |
| 1612 | /* Current float_block. */ |
| 1613 | |
| 1614 | struct float_block *float_block; |
| 1615 | |
| 1616 | /* Index of first unused Lisp_Float in the current float_block. */ |
| 1617 | |
| 1618 | int float_block_index; |
| 1619 | |
| 1620 | /* Total number of float blocks now in use. */ |
| 1621 | |
| 1622 | int n_float_blocks; |
| 1623 | |
| 1624 | /* Free-list of Lisp_Floats. */ |
| 1625 | |
| 1626 | struct Lisp_Float *float_free_list; |
| 1627 | |
| 1628 | |
| 1629 | /* Initialze float allocation. */ |
| 1630 | |
| 1631 | void |
| 1632 | init_float () |
| 1633 | { |
| 1634 | float_block = (struct float_block *) lisp_malloc (sizeof *float_block, |
| 1635 | MEM_TYPE_FLOAT); |
| 1636 | float_block->next = 0; |
| 1637 | bzero ((char *) float_block->floats, sizeof float_block->floats); |
| 1638 | float_block_index = 0; |
| 1639 | float_free_list = 0; |
| 1640 | n_float_blocks = 1; |
| 1641 | } |
| 1642 | |
| 1643 | |
| 1644 | /* Explicitly free a float cell by putting it on the free-list. */ |
| 1645 | |
| 1646 | void |
| 1647 | free_float (ptr) |
| 1648 | struct Lisp_Float *ptr; |
| 1649 | { |
| 1650 | *(struct Lisp_Float **)&ptr->data = float_free_list; |
| 1651 | #if GC_MARK_STACK |
| 1652 | ptr->type = Vdead; |
| 1653 | #endif |
| 1654 | float_free_list = ptr; |
| 1655 | } |
| 1656 | |
| 1657 | |
| 1658 | /* Return a new float object with value FLOAT_VALUE. */ |
| 1659 | |
| 1660 | Lisp_Object |
| 1661 | make_float (float_value) |
| 1662 | double float_value; |
| 1663 | { |
| 1664 | register Lisp_Object val; |
| 1665 | |
| 1666 | if (float_free_list) |
| 1667 | { |
| 1668 | /* We use the data field for chaining the free list |
| 1669 | so that we won't use the same field that has the mark bit. */ |
| 1670 | XSETFLOAT (val, float_free_list); |
| 1671 | float_free_list = *(struct Lisp_Float **)&float_free_list->data; |
| 1672 | } |
| 1673 | else |
| 1674 | { |
| 1675 | if (float_block_index == FLOAT_BLOCK_SIZE) |
| 1676 | { |
| 1677 | register struct float_block *new; |
| 1678 | |
| 1679 | new = (struct float_block *) lisp_malloc (sizeof *new, |
| 1680 | MEM_TYPE_FLOAT); |
| 1681 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
| 1682 | new->next = float_block; |
| 1683 | float_block = new; |
| 1684 | float_block_index = 0; |
| 1685 | n_float_blocks++; |
| 1686 | } |
| 1687 | XSETFLOAT (val, &float_block->floats[float_block_index++]); |
| 1688 | } |
| 1689 | |
| 1690 | XFLOAT_DATA (val) = float_value; |
| 1691 | XSETFASTINT (XFLOAT (val)->type, 0); /* bug chasing -wsr */ |
| 1692 | consing_since_gc += sizeof (struct Lisp_Float); |
| 1693 | floats_consed++; |
| 1694 | return val; |
| 1695 | } |
| 1696 | |
| 1697 | |
| 1698 | \f |
| 1699 | /*********************************************************************** |
| 1700 | Cons Allocation |
| 1701 | ***********************************************************************/ |
| 1702 | |
| 1703 | /* We store cons cells inside of cons_blocks, allocating a new |
| 1704 | cons_block with malloc whenever necessary. Cons cells reclaimed by |
| 1705 | GC are put on a free list to be reallocated before allocating |
| 1706 | any new cons cells from the latest cons_block. |
| 1707 | |
| 1708 | Each cons_block is just under 1020 bytes long, |
| 1709 | since malloc really allocates in units of powers of two |
| 1710 | and uses 4 bytes for its own overhead. */ |
| 1711 | |
| 1712 | #define CONS_BLOCK_SIZE \ |
| 1713 | ((1020 - sizeof (struct cons_block *)) / sizeof (struct Lisp_Cons)) |
| 1714 | |
| 1715 | struct cons_block |
| 1716 | { |
| 1717 | struct cons_block *next; |
| 1718 | struct Lisp_Cons conses[CONS_BLOCK_SIZE]; |
| 1719 | }; |
| 1720 | |
| 1721 | /* Current cons_block. */ |
| 1722 | |
| 1723 | struct cons_block *cons_block; |
| 1724 | |
| 1725 | /* Index of first unused Lisp_Cons in the current block. */ |
| 1726 | |
| 1727 | int cons_block_index; |
| 1728 | |
| 1729 | /* Free-list of Lisp_Cons structures. */ |
| 1730 | |
| 1731 | struct Lisp_Cons *cons_free_list; |
| 1732 | |
| 1733 | /* Total number of cons blocks now in use. */ |
| 1734 | |
| 1735 | int n_cons_blocks; |
| 1736 | |
| 1737 | |
| 1738 | /* Initialize cons allocation. */ |
| 1739 | |
| 1740 | void |
| 1741 | init_cons () |
| 1742 | { |
| 1743 | cons_block = (struct cons_block *) lisp_malloc (sizeof *cons_block, |
| 1744 | MEM_TYPE_CONS); |
| 1745 | cons_block->next = 0; |
| 1746 | bzero ((char *) cons_block->conses, sizeof cons_block->conses); |
| 1747 | cons_block_index = 0; |
| 1748 | cons_free_list = 0; |
| 1749 | n_cons_blocks = 1; |
| 1750 | } |
| 1751 | |
| 1752 | |
| 1753 | /* Explicitly free a cons cell by putting it on the free-list. */ |
| 1754 | |
| 1755 | void |
| 1756 | free_cons (ptr) |
| 1757 | struct Lisp_Cons *ptr; |
| 1758 | { |
| 1759 | *(struct Lisp_Cons **)&ptr->cdr = cons_free_list; |
| 1760 | #if GC_MARK_STACK |
| 1761 | ptr->car = Vdead; |
| 1762 | #endif |
| 1763 | cons_free_list = ptr; |
| 1764 | } |
| 1765 | |
| 1766 | |
| 1767 | DEFUN ("cons", Fcons, Scons, 2, 2, 0, |
| 1768 | "Create a new cons, give it CAR and CDR as components, and return it.") |
| 1769 | (car, cdr) |
| 1770 | Lisp_Object car, cdr; |
| 1771 | { |
| 1772 | register Lisp_Object val; |
| 1773 | |
| 1774 | if (cons_free_list) |
| 1775 | { |
| 1776 | /* We use the cdr for chaining the free list |
| 1777 | so that we won't use the same field that has the mark bit. */ |
| 1778 | XSETCONS (val, cons_free_list); |
| 1779 | cons_free_list = *(struct Lisp_Cons **)&cons_free_list->cdr; |
| 1780 | } |
| 1781 | else |
| 1782 | { |
| 1783 | if (cons_block_index == CONS_BLOCK_SIZE) |
| 1784 | { |
| 1785 | register struct cons_block *new; |
| 1786 | new = (struct cons_block *) lisp_malloc (sizeof *new, |
| 1787 | MEM_TYPE_CONS); |
| 1788 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
| 1789 | new->next = cons_block; |
| 1790 | cons_block = new; |
| 1791 | cons_block_index = 0; |
| 1792 | n_cons_blocks++; |
| 1793 | } |
| 1794 | XSETCONS (val, &cons_block->conses[cons_block_index++]); |
| 1795 | } |
| 1796 | |
| 1797 | XCAR (val) = car; |
| 1798 | XCDR (val) = cdr; |
| 1799 | consing_since_gc += sizeof (struct Lisp_Cons); |
| 1800 | cons_cells_consed++; |
| 1801 | return val; |
| 1802 | } |
| 1803 | |
| 1804 | |
| 1805 | /* Make a list of 2, 3, 4 or 5 specified objects. */ |
| 1806 | |
| 1807 | Lisp_Object |
| 1808 | list2 (arg1, arg2) |
| 1809 | Lisp_Object arg1, arg2; |
| 1810 | { |
| 1811 | return Fcons (arg1, Fcons (arg2, Qnil)); |
| 1812 | } |
| 1813 | |
| 1814 | |
| 1815 | Lisp_Object |
| 1816 | list3 (arg1, arg2, arg3) |
| 1817 | Lisp_Object arg1, arg2, arg3; |
| 1818 | { |
| 1819 | return Fcons (arg1, Fcons (arg2, Fcons (arg3, Qnil))); |
| 1820 | } |
| 1821 | |
| 1822 | |
| 1823 | Lisp_Object |
| 1824 | list4 (arg1, arg2, arg3, arg4) |
| 1825 | Lisp_Object arg1, arg2, arg3, arg4; |
| 1826 | { |
| 1827 | return Fcons (arg1, Fcons (arg2, Fcons (arg3, Fcons (arg4, Qnil)))); |
| 1828 | } |
| 1829 | |
| 1830 | |
| 1831 | Lisp_Object |
| 1832 | list5 (arg1, arg2, arg3, arg4, arg5) |
| 1833 | Lisp_Object arg1, arg2, arg3, arg4, arg5; |
| 1834 | { |
| 1835 | return Fcons (arg1, Fcons (arg2, Fcons (arg3, Fcons (arg4, |
| 1836 | Fcons (arg5, Qnil))))); |
| 1837 | } |
| 1838 | |
| 1839 | |
| 1840 | DEFUN ("list", Flist, Slist, 0, MANY, 0, |
| 1841 | "Return a newly created list with specified arguments as elements.\n\ |
| 1842 | Any number of arguments, even zero arguments, are allowed.") |
| 1843 | (nargs, args) |
| 1844 | int nargs; |
| 1845 | register Lisp_Object *args; |
| 1846 | { |
| 1847 | register Lisp_Object val; |
| 1848 | val = Qnil; |
| 1849 | |
| 1850 | while (nargs > 0) |
| 1851 | { |
| 1852 | nargs--; |
| 1853 | val = Fcons (args[nargs], val); |
| 1854 | } |
| 1855 | return val; |
| 1856 | } |
| 1857 | |
| 1858 | |
| 1859 | DEFUN ("make-list", Fmake_list, Smake_list, 2, 2, 0, |
| 1860 | "Return a newly created list of length LENGTH, with each element being INIT.") |
| 1861 | (length, init) |
| 1862 | register Lisp_Object length, init; |
| 1863 | { |
| 1864 | register Lisp_Object val; |
| 1865 | register int size; |
| 1866 | |
| 1867 | CHECK_NATNUM (length, 0); |
| 1868 | size = XFASTINT (length); |
| 1869 | |
| 1870 | val = Qnil; |
| 1871 | while (size-- > 0) |
| 1872 | val = Fcons (init, val); |
| 1873 | return val; |
| 1874 | } |
| 1875 | |
| 1876 | |
| 1877 | \f |
| 1878 | /*********************************************************************** |
| 1879 | Vector Allocation |
| 1880 | ***********************************************************************/ |
| 1881 | |
| 1882 | /* Singly-linked list of all vectors. */ |
| 1883 | |
| 1884 | struct Lisp_Vector *all_vectors; |
| 1885 | |
| 1886 | /* Total number of vector-like objects now in use. */ |
| 1887 | |
| 1888 | int n_vectors; |
| 1889 | |
| 1890 | |
| 1891 | /* Value is a pointer to a newly allocated Lisp_Vector structure |
| 1892 | with room for LEN Lisp_Objects. */ |
| 1893 | |
| 1894 | struct Lisp_Vector * |
| 1895 | allocate_vectorlike (len) |
| 1896 | EMACS_INT len; |
| 1897 | { |
| 1898 | struct Lisp_Vector *p; |
| 1899 | size_t nbytes; |
| 1900 | |
| 1901 | #ifdef DOUG_LEA_MALLOC |
| 1902 | /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed |
| 1903 | because mapped region contents are not preserved in |
| 1904 | a dumped Emacs. */ |
| 1905 | mallopt (M_MMAP_MAX, 0); |
| 1906 | #endif |
| 1907 | |
| 1908 | nbytes = sizeof *p + (len - 1) * sizeof p->contents[0]; |
| 1909 | p = (struct Lisp_Vector *) lisp_malloc (nbytes, MEM_TYPE_VECTOR); |
| 1910 | |
| 1911 | #ifdef DOUG_LEA_MALLOC |
| 1912 | /* Back to a reasonable maximum of mmap'ed areas. */ |
| 1913 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); |
| 1914 | #endif |
| 1915 | |
| 1916 | VALIDATE_LISP_STORAGE (p, 0); |
| 1917 | consing_since_gc += nbytes; |
| 1918 | vector_cells_consed += len; |
| 1919 | |
| 1920 | p->next = all_vectors; |
| 1921 | all_vectors = p; |
| 1922 | ++n_vectors; |
| 1923 | return p; |
| 1924 | } |
| 1925 | |
| 1926 | |
| 1927 | DEFUN ("make-vector", Fmake_vector, Smake_vector, 2, 2, 0, |
| 1928 | "Return a newly created vector of length LENGTH, with each element being INIT.\n\ |
| 1929 | See also the function `vector'.") |
| 1930 | (length, init) |
| 1931 | register Lisp_Object length, init; |
| 1932 | { |
| 1933 | Lisp_Object vector; |
| 1934 | register EMACS_INT sizei; |
| 1935 | register int index; |
| 1936 | register struct Lisp_Vector *p; |
| 1937 | |
| 1938 | CHECK_NATNUM (length, 0); |
| 1939 | sizei = XFASTINT (length); |
| 1940 | |
| 1941 | p = allocate_vectorlike (sizei); |
| 1942 | p->size = sizei; |
| 1943 | for (index = 0; index < sizei; index++) |
| 1944 | p->contents[index] = init; |
| 1945 | |
| 1946 | XSETVECTOR (vector, p); |
| 1947 | return vector; |
| 1948 | } |
| 1949 | |
| 1950 | |
| 1951 | DEFUN ("make-char-table", Fmake_char_table, Smake_char_table, 1, 2, 0, |
| 1952 | "Return a newly created char-table, with purpose PURPOSE.\n\ |
| 1953 | Each element is initialized to INIT, which defaults to nil.\n\ |
| 1954 | PURPOSE should be a symbol which has a `char-table-extra-slots' property.\n\ |
| 1955 | The property's value should be an integer between 0 and 10.") |
| 1956 | (purpose, init) |
| 1957 | register Lisp_Object purpose, init; |
| 1958 | { |
| 1959 | Lisp_Object vector; |
| 1960 | Lisp_Object n; |
| 1961 | CHECK_SYMBOL (purpose, 1); |
| 1962 | n = Fget (purpose, Qchar_table_extra_slots); |
| 1963 | CHECK_NUMBER (n, 0); |
| 1964 | if (XINT (n) < 0 || XINT (n) > 10) |
| 1965 | args_out_of_range (n, Qnil); |
| 1966 | /* Add 2 to the size for the defalt and parent slots. */ |
| 1967 | vector = Fmake_vector (make_number (CHAR_TABLE_STANDARD_SLOTS + XINT (n)), |
| 1968 | init); |
| 1969 | XCHAR_TABLE (vector)->top = Qt; |
| 1970 | XCHAR_TABLE (vector)->parent = Qnil; |
| 1971 | XCHAR_TABLE (vector)->purpose = purpose; |
| 1972 | XSETCHAR_TABLE (vector, XCHAR_TABLE (vector)); |
| 1973 | return vector; |
| 1974 | } |
| 1975 | |
| 1976 | |
| 1977 | /* Return a newly created sub char table with default value DEFALT. |
| 1978 | Since a sub char table does not appear as a top level Emacs Lisp |
| 1979 | object, we don't need a Lisp interface to make it. */ |
| 1980 | |
| 1981 | Lisp_Object |
| 1982 | make_sub_char_table (defalt) |
| 1983 | Lisp_Object defalt; |
| 1984 | { |
| 1985 | Lisp_Object vector |
| 1986 | = Fmake_vector (make_number (SUB_CHAR_TABLE_STANDARD_SLOTS), Qnil); |
| 1987 | XCHAR_TABLE (vector)->top = Qnil; |
| 1988 | XCHAR_TABLE (vector)->defalt = defalt; |
| 1989 | XSETCHAR_TABLE (vector, XCHAR_TABLE (vector)); |
| 1990 | return vector; |
| 1991 | } |
| 1992 | |
| 1993 | |
| 1994 | DEFUN ("vector", Fvector, Svector, 0, MANY, 0, |
| 1995 | "Return a newly created vector with specified arguments as elements.\n\ |
| 1996 | Any number of arguments, even zero arguments, are allowed.") |
| 1997 | (nargs, args) |
| 1998 | register int nargs; |
| 1999 | Lisp_Object *args; |
| 2000 | { |
| 2001 | register Lisp_Object len, val; |
| 2002 | register int index; |
| 2003 | register struct Lisp_Vector *p; |
| 2004 | |
| 2005 | XSETFASTINT (len, nargs); |
| 2006 | val = Fmake_vector (len, Qnil); |
| 2007 | p = XVECTOR (val); |
| 2008 | for (index = 0; index < nargs; index++) |
| 2009 | p->contents[index] = args[index]; |
| 2010 | return val; |
| 2011 | } |
| 2012 | |
| 2013 | |
| 2014 | DEFUN ("make-byte-code", Fmake_byte_code, Smake_byte_code, 4, MANY, 0, |
| 2015 | "Create a byte-code object with specified arguments as elements.\n\ |
| 2016 | The arguments should be the arglist, bytecode-string, constant vector,\n\ |
| 2017 | stack size, (optional) doc string, and (optional) interactive spec.\n\ |
| 2018 | The first four arguments are required; at most six have any\n\ |
| 2019 | significance.") |
| 2020 | (nargs, args) |
| 2021 | register int nargs; |
| 2022 | Lisp_Object *args; |
| 2023 | { |
| 2024 | register Lisp_Object len, val; |
| 2025 | register int index; |
| 2026 | register struct Lisp_Vector *p; |
| 2027 | |
| 2028 | XSETFASTINT (len, nargs); |
| 2029 | if (!NILP (Vpurify_flag)) |
| 2030 | val = make_pure_vector ((EMACS_INT) nargs); |
| 2031 | else |
| 2032 | val = Fmake_vector (len, Qnil); |
| 2033 | |
| 2034 | if (STRINGP (args[1]) && STRING_MULTIBYTE (args[1])) |
| 2035 | /* BYTECODE-STRING must have been produced by Emacs 20.2 or the |
| 2036 | earlier because they produced a raw 8-bit string for byte-code |
| 2037 | and now such a byte-code string is loaded as multibyte while |
| 2038 | raw 8-bit characters converted to multibyte form. Thus, now we |
| 2039 | must convert them back to the original unibyte form. */ |
| 2040 | args[1] = Fstring_as_unibyte (args[1]); |
| 2041 | |
| 2042 | p = XVECTOR (val); |
| 2043 | for (index = 0; index < nargs; index++) |
| 2044 | { |
| 2045 | if (!NILP (Vpurify_flag)) |
| 2046 | args[index] = Fpurecopy (args[index]); |
| 2047 | p->contents[index] = args[index]; |
| 2048 | } |
| 2049 | XSETCOMPILED (val, p); |
| 2050 | return val; |
| 2051 | } |
| 2052 | |
| 2053 | |
| 2054 | \f |
| 2055 | /*********************************************************************** |
| 2056 | Symbol Allocation |
| 2057 | ***********************************************************************/ |
| 2058 | |
| 2059 | /* Each symbol_block is just under 1020 bytes long, since malloc |
| 2060 | really allocates in units of powers of two and uses 4 bytes for its |
| 2061 | own overhead. */ |
| 2062 | |
| 2063 | #define SYMBOL_BLOCK_SIZE \ |
| 2064 | ((1020 - sizeof (struct symbol_block *)) / sizeof (struct Lisp_Symbol)) |
| 2065 | |
| 2066 | struct symbol_block |
| 2067 | { |
| 2068 | struct symbol_block *next; |
| 2069 | struct Lisp_Symbol symbols[SYMBOL_BLOCK_SIZE]; |
| 2070 | }; |
| 2071 | |
| 2072 | /* Current symbol block and index of first unused Lisp_Symbol |
| 2073 | structure in it. */ |
| 2074 | |
| 2075 | struct symbol_block *symbol_block; |
| 2076 | int symbol_block_index; |
| 2077 | |
| 2078 | /* List of free symbols. */ |
| 2079 | |
| 2080 | struct Lisp_Symbol *symbol_free_list; |
| 2081 | |
| 2082 | /* Total number of symbol blocks now in use. */ |
| 2083 | |
| 2084 | int n_symbol_blocks; |
| 2085 | |
| 2086 | |
| 2087 | /* Initialize symbol allocation. */ |
| 2088 | |
| 2089 | void |
| 2090 | init_symbol () |
| 2091 | { |
| 2092 | symbol_block = (struct symbol_block *) lisp_malloc (sizeof *symbol_block, |
| 2093 | MEM_TYPE_SYMBOL); |
| 2094 | symbol_block->next = 0; |
| 2095 | bzero ((char *) symbol_block->symbols, sizeof symbol_block->symbols); |
| 2096 | symbol_block_index = 0; |
| 2097 | symbol_free_list = 0; |
| 2098 | n_symbol_blocks = 1; |
| 2099 | } |
| 2100 | |
| 2101 | |
| 2102 | DEFUN ("make-symbol", Fmake_symbol, Smake_symbol, 1, 1, 0, |
| 2103 | "Return a newly allocated uninterned symbol whose name is NAME.\n\ |
| 2104 | Its value and function definition are void, and its property list is nil.") |
| 2105 | (name) |
| 2106 | Lisp_Object name; |
| 2107 | { |
| 2108 | register Lisp_Object val; |
| 2109 | register struct Lisp_Symbol *p; |
| 2110 | |
| 2111 | CHECK_STRING (name, 0); |
| 2112 | |
| 2113 | if (symbol_free_list) |
| 2114 | { |
| 2115 | XSETSYMBOL (val, symbol_free_list); |
| 2116 | symbol_free_list = *(struct Lisp_Symbol **)&symbol_free_list->value; |
| 2117 | } |
| 2118 | else |
| 2119 | { |
| 2120 | if (symbol_block_index == SYMBOL_BLOCK_SIZE) |
| 2121 | { |
| 2122 | struct symbol_block *new; |
| 2123 | new = (struct symbol_block *) lisp_malloc (sizeof *new, |
| 2124 | MEM_TYPE_SYMBOL); |
| 2125 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
| 2126 | new->next = symbol_block; |
| 2127 | symbol_block = new; |
| 2128 | symbol_block_index = 0; |
| 2129 | n_symbol_blocks++; |
| 2130 | } |
| 2131 | XSETSYMBOL (val, &symbol_block->symbols[symbol_block_index++]); |
| 2132 | } |
| 2133 | |
| 2134 | p = XSYMBOL (val); |
| 2135 | p->name = XSTRING (name); |
| 2136 | p->obarray = Qnil; |
| 2137 | p->plist = Qnil; |
| 2138 | p->value = Qunbound; |
| 2139 | p->function = Qunbound; |
| 2140 | p->next = 0; |
| 2141 | consing_since_gc += sizeof (struct Lisp_Symbol); |
| 2142 | symbols_consed++; |
| 2143 | return val; |
| 2144 | } |
| 2145 | |
| 2146 | |
| 2147 | \f |
| 2148 | /*********************************************************************** |
| 2149 | Marker (Misc) Allocation |
| 2150 | ***********************************************************************/ |
| 2151 | |
| 2152 | /* Allocation of markers and other objects that share that structure. |
| 2153 | Works like allocation of conses. */ |
| 2154 | |
| 2155 | #define MARKER_BLOCK_SIZE \ |
| 2156 | ((1020 - sizeof (struct marker_block *)) / sizeof (union Lisp_Misc)) |
| 2157 | |
| 2158 | struct marker_block |
| 2159 | { |
| 2160 | struct marker_block *next; |
| 2161 | union Lisp_Misc markers[MARKER_BLOCK_SIZE]; |
| 2162 | }; |
| 2163 | |
| 2164 | struct marker_block *marker_block; |
| 2165 | int marker_block_index; |
| 2166 | |
| 2167 | union Lisp_Misc *marker_free_list; |
| 2168 | |
| 2169 | /* Total number of marker blocks now in use. */ |
| 2170 | |
| 2171 | int n_marker_blocks; |
| 2172 | |
| 2173 | void |
| 2174 | init_marker () |
| 2175 | { |
| 2176 | marker_block = (struct marker_block *) lisp_malloc (sizeof *marker_block, |
| 2177 | MEM_TYPE_MISC); |
| 2178 | marker_block->next = 0; |
| 2179 | bzero ((char *) marker_block->markers, sizeof marker_block->markers); |
| 2180 | marker_block_index = 0; |
| 2181 | marker_free_list = 0; |
| 2182 | n_marker_blocks = 1; |
| 2183 | } |
| 2184 | |
| 2185 | /* Return a newly allocated Lisp_Misc object, with no substructure. */ |
| 2186 | |
| 2187 | Lisp_Object |
| 2188 | allocate_misc () |
| 2189 | { |
| 2190 | Lisp_Object val; |
| 2191 | |
| 2192 | if (marker_free_list) |
| 2193 | { |
| 2194 | XSETMISC (val, marker_free_list); |
| 2195 | marker_free_list = marker_free_list->u_free.chain; |
| 2196 | } |
| 2197 | else |
| 2198 | { |
| 2199 | if (marker_block_index == MARKER_BLOCK_SIZE) |
| 2200 | { |
| 2201 | struct marker_block *new; |
| 2202 | new = (struct marker_block *) lisp_malloc (sizeof *new, |
| 2203 | MEM_TYPE_MISC); |
| 2204 | VALIDATE_LISP_STORAGE (new, sizeof *new); |
| 2205 | new->next = marker_block; |
| 2206 | marker_block = new; |
| 2207 | marker_block_index = 0; |
| 2208 | n_marker_blocks++; |
| 2209 | } |
| 2210 | XSETMISC (val, &marker_block->markers[marker_block_index++]); |
| 2211 | } |
| 2212 | |
| 2213 | consing_since_gc += sizeof (union Lisp_Misc); |
| 2214 | misc_objects_consed++; |
| 2215 | return val; |
| 2216 | } |
| 2217 | |
| 2218 | DEFUN ("make-marker", Fmake_marker, Smake_marker, 0, 0, 0, |
| 2219 | "Return a newly allocated marker which does not point at any place.") |
| 2220 | () |
| 2221 | { |
| 2222 | register Lisp_Object val; |
| 2223 | register struct Lisp_Marker *p; |
| 2224 | |
| 2225 | val = allocate_misc (); |
| 2226 | XMISCTYPE (val) = Lisp_Misc_Marker; |
| 2227 | p = XMARKER (val); |
| 2228 | p->buffer = 0; |
| 2229 | p->bytepos = 0; |
| 2230 | p->charpos = 0; |
| 2231 | p->chain = Qnil; |
| 2232 | p->insertion_type = 0; |
| 2233 | return val; |
| 2234 | } |
| 2235 | |
| 2236 | /* Put MARKER back on the free list after using it temporarily. */ |
| 2237 | |
| 2238 | void |
| 2239 | free_marker (marker) |
| 2240 | Lisp_Object marker; |
| 2241 | { |
| 2242 | unchain_marker (marker); |
| 2243 | |
| 2244 | XMISC (marker)->u_marker.type = Lisp_Misc_Free; |
| 2245 | XMISC (marker)->u_free.chain = marker_free_list; |
| 2246 | marker_free_list = XMISC (marker); |
| 2247 | |
| 2248 | total_free_markers++; |
| 2249 | } |
| 2250 | |
| 2251 | \f |
| 2252 | /* Return a newly created vector or string with specified arguments as |
| 2253 | elements. If all the arguments are characters that can fit |
| 2254 | in a string of events, make a string; otherwise, make a vector. |
| 2255 | |
| 2256 | Any number of arguments, even zero arguments, are allowed. */ |
| 2257 | |
| 2258 | Lisp_Object |
| 2259 | make_event_array (nargs, args) |
| 2260 | register int nargs; |
| 2261 | Lisp_Object *args; |
| 2262 | { |
| 2263 | int i; |
| 2264 | |
| 2265 | for (i = 0; i < nargs; i++) |
| 2266 | /* The things that fit in a string |
| 2267 | are characters that are in 0...127, |
| 2268 | after discarding the meta bit and all the bits above it. */ |
| 2269 | if (!INTEGERP (args[i]) |
| 2270 | || (XUINT (args[i]) & ~(-CHAR_META)) >= 0200) |
| 2271 | return Fvector (nargs, args); |
| 2272 | |
| 2273 | /* Since the loop exited, we know that all the things in it are |
| 2274 | characters, so we can make a string. */ |
| 2275 | { |
| 2276 | Lisp_Object result; |
| 2277 | |
| 2278 | result = Fmake_string (make_number (nargs), make_number (0)); |
| 2279 | for (i = 0; i < nargs; i++) |
| 2280 | { |
| 2281 | XSTRING (result)->data[i] = XINT (args[i]); |
| 2282 | /* Move the meta bit to the right place for a string char. */ |
| 2283 | if (XINT (args[i]) & CHAR_META) |
| 2284 | XSTRING (result)->data[i] |= 0x80; |
| 2285 | } |
| 2286 | |
| 2287 | return result; |
| 2288 | } |
| 2289 | } |
| 2290 | |
| 2291 | |
| 2292 | \f |
| 2293 | /************************************************************************ |
| 2294 | C Stack Marking |
| 2295 | ************************************************************************/ |
| 2296 | |
| 2297 | #if GC_MARK_STACK |
| 2298 | |
| 2299 | |
| 2300 | /* Base address of stack. Set in main. */ |
| 2301 | |
| 2302 | Lisp_Object *stack_base; |
| 2303 | |
| 2304 | /* A node in the red-black tree describing allocated memory containing |
| 2305 | Lisp data. Each such block is recorded with its start and end |
| 2306 | address when it is allocated, and removed from the tree when it |
| 2307 | is freed. |
| 2308 | |
| 2309 | A red-black tree is a balanced binary tree with the following |
| 2310 | properties: |
| 2311 | |
| 2312 | 1. Every node is either red or black. |
| 2313 | 2. Every leaf is black. |
| 2314 | 3. If a node is red, then both of its children are black. |
| 2315 | 4. Every simple path from a node to a descendant leaf contains |
| 2316 | the same number of black nodes. |
| 2317 | 5. The root is always black. |
| 2318 | |
| 2319 | When nodes are inserted into the tree, or deleted from the tree, |
| 2320 | the tree is "fixed" so that these properties are always true. |
| 2321 | |
| 2322 | A red-black tree with N internal nodes has height at most 2 |
| 2323 | log(N+1). Searches, insertions and deletions are done in O(log N). |
| 2324 | Please see a text book about data structures for a detailed |
| 2325 | description of red-black trees. Any book worth its salt should |
| 2326 | describe them. */ |
| 2327 | |
| 2328 | struct mem_node |
| 2329 | { |
| 2330 | struct mem_node *left, *right, *parent; |
| 2331 | |
| 2332 | /* Start and end of allocated region. */ |
| 2333 | void *start, *end; |
| 2334 | |
| 2335 | /* Node color. */ |
| 2336 | enum {MEM_BLACK, MEM_RED} color; |
| 2337 | |
| 2338 | /* Memory type. */ |
| 2339 | enum mem_type type; |
| 2340 | }; |
| 2341 | |
| 2342 | /* Root of the tree describing allocated Lisp memory. */ |
| 2343 | |
| 2344 | static struct mem_node *mem_root; |
| 2345 | |
| 2346 | /* Sentinel node of the tree. */ |
| 2347 | |
| 2348 | static struct mem_node mem_z; |
| 2349 | #define MEM_NIL &mem_z |
| 2350 | |
| 2351 | |
| 2352 | /* Initialize this part of alloc.c. */ |
| 2353 | |
| 2354 | static void |
| 2355 | mem_init () |
| 2356 | { |
| 2357 | mem_z.left = mem_z.right = MEM_NIL; |
| 2358 | mem_z.parent = NULL; |
| 2359 | mem_z.color = MEM_BLACK; |
| 2360 | mem_z.start = mem_z.end = NULL; |
| 2361 | mem_root = MEM_NIL; |
| 2362 | } |
| 2363 | |
| 2364 | |
| 2365 | /* Value is a pointer to the mem_node containing START. Value is |
| 2366 | MEM_NIL if there is no node in the tree containing START. */ |
| 2367 | |
| 2368 | static INLINE struct mem_node * |
| 2369 | mem_find (start) |
| 2370 | void *start; |
| 2371 | { |
| 2372 | struct mem_node *p; |
| 2373 | |
| 2374 | /* Make the search always successful to speed up the loop below. */ |
| 2375 | mem_z.start = start; |
| 2376 | mem_z.end = (char *) start + 1; |
| 2377 | |
| 2378 | p = mem_root; |
| 2379 | while (start < p->start || start >= p->end) |
| 2380 | p = start < p->start ? p->left : p->right; |
| 2381 | return p; |
| 2382 | } |
| 2383 | |
| 2384 | |
| 2385 | /* Insert a new node into the tree for a block of memory with start |
| 2386 | address START, end address END, and type TYPE. Value is a |
| 2387 | pointer to the node that was inserted. */ |
| 2388 | |
| 2389 | static struct mem_node * |
| 2390 | mem_insert (start, end, type) |
| 2391 | void *start, *end; |
| 2392 | enum mem_type type; |
| 2393 | { |
| 2394 | struct mem_node *c, *parent, *x; |
| 2395 | |
| 2396 | /* See where in the tree a node for START belongs. In this |
| 2397 | particular application, it shouldn't happen that a node is already |
| 2398 | present. For debugging purposes, let's check that. */ |
| 2399 | c = mem_root; |
| 2400 | parent = NULL; |
| 2401 | |
| 2402 | #if GC_MARK_STACK != GC_MAKE_GCPROS_NOOPS |
| 2403 | |
| 2404 | while (c != MEM_NIL) |
| 2405 | { |
| 2406 | if (start >= c->start && start < c->end) |
| 2407 | abort (); |
| 2408 | parent = c; |
| 2409 | c = start < c->start ? c->left : c->right; |
| 2410 | } |
| 2411 | |
| 2412 | #else /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */ |
| 2413 | |
| 2414 | while (c != MEM_NIL) |
| 2415 | { |
| 2416 | parent = c; |
| 2417 | c = start < c->start ? c->left : c->right; |
| 2418 | } |
| 2419 | |
| 2420 | #endif /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */ |
| 2421 | |
| 2422 | /* Create a new node. */ |
| 2423 | x = (struct mem_node *) xmalloc (sizeof *x); |
| 2424 | x->start = start; |
| 2425 | x->end = end; |
| 2426 | x->type = type; |
| 2427 | x->parent = parent; |
| 2428 | x->left = x->right = MEM_NIL; |
| 2429 | x->color = MEM_RED; |
| 2430 | |
| 2431 | /* Insert it as child of PARENT or install it as root. */ |
| 2432 | if (parent) |
| 2433 | { |
| 2434 | if (start < parent->start) |
| 2435 | parent->left = x; |
| 2436 | else |
| 2437 | parent->right = x; |
| 2438 | } |
| 2439 | else |
| 2440 | mem_root = x; |
| 2441 | |
| 2442 | /* Re-establish red-black tree properties. */ |
| 2443 | mem_insert_fixup (x); |
| 2444 | return x; |
| 2445 | } |
| 2446 | |
| 2447 | |
| 2448 | /* Re-establish the red-black properties of the tree, and thereby |
| 2449 | balance the tree, after node X has been inserted; X is always red. */ |
| 2450 | |
| 2451 | static void |
| 2452 | mem_insert_fixup (x) |
| 2453 | struct mem_node *x; |
| 2454 | { |
| 2455 | while (x != mem_root && x->parent->color == MEM_RED) |
| 2456 | { |
| 2457 | /* X is red and its parent is red. This is a violation of |
| 2458 | red-black tree property #3. */ |
| 2459 | |
| 2460 | if (x->parent == x->parent->parent->left) |
| 2461 | { |
| 2462 | /* We're on the left side of our grandparent, and Y is our |
| 2463 | "uncle". */ |
| 2464 | struct mem_node *y = x->parent->parent->right; |
| 2465 | |
| 2466 | if (y->color == MEM_RED) |
| 2467 | { |
| 2468 | /* Uncle and parent are red but should be black because |
| 2469 | X is red. Change the colors accordingly and proceed |
| 2470 | with the grandparent. */ |
| 2471 | x->parent->color = MEM_BLACK; |
| 2472 | y->color = MEM_BLACK; |
| 2473 | x->parent->parent->color = MEM_RED; |
| 2474 | x = x->parent->parent; |
| 2475 | } |
| 2476 | else |
| 2477 | { |
| 2478 | /* Parent and uncle have different colors; parent is |
| 2479 | red, uncle is black. */ |
| 2480 | if (x == x->parent->right) |
| 2481 | { |
| 2482 | x = x->parent; |
| 2483 | mem_rotate_left (x); |
| 2484 | } |
| 2485 | |
| 2486 | x->parent->color = MEM_BLACK; |
| 2487 | x->parent->parent->color = MEM_RED; |
| 2488 | mem_rotate_right (x->parent->parent); |
| 2489 | } |
| 2490 | } |
| 2491 | else |
| 2492 | { |
| 2493 | /* This is the symmetrical case of above. */ |
| 2494 | struct mem_node *y = x->parent->parent->left; |
| 2495 | |
| 2496 | if (y->color == MEM_RED) |
| 2497 | { |
| 2498 | x->parent->color = MEM_BLACK; |
| 2499 | y->color = MEM_BLACK; |
| 2500 | x->parent->parent->color = MEM_RED; |
| 2501 | x = x->parent->parent; |
| 2502 | } |
| 2503 | else |
| 2504 | { |
| 2505 | if (x == x->parent->left) |
| 2506 | { |
| 2507 | x = x->parent; |
| 2508 | mem_rotate_right (x); |
| 2509 | } |
| 2510 | |
| 2511 | x->parent->color = MEM_BLACK; |
| 2512 | x->parent->parent->color = MEM_RED; |
| 2513 | mem_rotate_left (x->parent->parent); |
| 2514 | } |
| 2515 | } |
| 2516 | } |
| 2517 | |
| 2518 | /* The root may have been changed to red due to the algorithm. Set |
| 2519 | it to black so that property #5 is satisfied. */ |
| 2520 | mem_root->color = MEM_BLACK; |
| 2521 | } |
| 2522 | |
| 2523 | |
| 2524 | /* (x) (y) |
| 2525 | / \ / \ |
| 2526 | a (y) ===> (x) c |
| 2527 | / \ / \ |
| 2528 | b c a b */ |
| 2529 | |
| 2530 | static void |
| 2531 | mem_rotate_left (x) |
| 2532 | struct mem_node *x; |
| 2533 | { |
| 2534 | struct mem_node *y; |
| 2535 | |
| 2536 | /* Turn y's left sub-tree into x's right sub-tree. */ |
| 2537 | y = x->right; |
| 2538 | x->right = y->left; |
| 2539 | if (y->left != MEM_NIL) |
| 2540 | y->left->parent = x; |
| 2541 | |
| 2542 | /* Y's parent was x's parent. */ |
| 2543 | if (y != MEM_NIL) |
| 2544 | y->parent = x->parent; |
| 2545 | |
| 2546 | /* Get the parent to point to y instead of x. */ |
| 2547 | if (x->parent) |
| 2548 | { |
| 2549 | if (x == x->parent->left) |
| 2550 | x->parent->left = y; |
| 2551 | else |
| 2552 | x->parent->right = y; |
| 2553 | } |
| 2554 | else |
| 2555 | mem_root = y; |
| 2556 | |
| 2557 | /* Put x on y's left. */ |
| 2558 | y->left = x; |
| 2559 | if (x != MEM_NIL) |
| 2560 | x->parent = y; |
| 2561 | } |
| 2562 | |
| 2563 | |
| 2564 | /* (x) (Y) |
| 2565 | / \ / \ |
| 2566 | (y) c ===> a (x) |
| 2567 | / \ / \ |
| 2568 | a b b c */ |
| 2569 | |
| 2570 | static void |
| 2571 | mem_rotate_right (x) |
| 2572 | struct mem_node *x; |
| 2573 | { |
| 2574 | struct mem_node *y = x->left; |
| 2575 | |
| 2576 | x->left = y->right; |
| 2577 | if (y->right != MEM_NIL) |
| 2578 | y->right->parent = x; |
| 2579 | |
| 2580 | if (y != MEM_NIL) |
| 2581 | y->parent = x->parent; |
| 2582 | if (x->parent) |
| 2583 | { |
| 2584 | if (x == x->parent->right) |
| 2585 | x->parent->right = y; |
| 2586 | else |
| 2587 | x->parent->left = y; |
| 2588 | } |
| 2589 | else |
| 2590 | mem_root = y; |
| 2591 | |
| 2592 | y->right = x; |
| 2593 | if (x != MEM_NIL) |
| 2594 | x->parent = y; |
| 2595 | } |
| 2596 | |
| 2597 | |
| 2598 | /* Delete node Z from the tree. If Z is null or MEM_NIL, do nothing. */ |
| 2599 | |
| 2600 | static void |
| 2601 | mem_delete (z) |
| 2602 | struct mem_node *z; |
| 2603 | { |
| 2604 | struct mem_node *x, *y; |
| 2605 | |
| 2606 | if (!z || z == MEM_NIL) |
| 2607 | return; |
| 2608 | |
| 2609 | if (z->left == MEM_NIL || z->right == MEM_NIL) |
| 2610 | y = z; |
| 2611 | else |
| 2612 | { |
| 2613 | y = z->right; |
| 2614 | while (y->left != MEM_NIL) |
| 2615 | y = y->left; |
| 2616 | } |
| 2617 | |
| 2618 | if (y->left != MEM_NIL) |
| 2619 | x = y->left; |
| 2620 | else |
| 2621 | x = y->right; |
| 2622 | |
| 2623 | x->parent = y->parent; |
| 2624 | if (y->parent) |
| 2625 | { |
| 2626 | if (y == y->parent->left) |
| 2627 | y->parent->left = x; |
| 2628 | else |
| 2629 | y->parent->right = x; |
| 2630 | } |
| 2631 | else |
| 2632 | mem_root = x; |
| 2633 | |
| 2634 | if (y != z) |
| 2635 | { |
| 2636 | z->start = y->start; |
| 2637 | z->end = y->end; |
| 2638 | z->type = y->type; |
| 2639 | } |
| 2640 | |
| 2641 | if (y->color == MEM_BLACK) |
| 2642 | mem_delete_fixup (x); |
| 2643 | xfree (y); |
| 2644 | } |
| 2645 | |
| 2646 | |
| 2647 | /* Re-establish the red-black properties of the tree, after a |
| 2648 | deletion. */ |
| 2649 | |
| 2650 | static void |
| 2651 | mem_delete_fixup (x) |
| 2652 | struct mem_node *x; |
| 2653 | { |
| 2654 | while (x != mem_root && x->color == MEM_BLACK) |
| 2655 | { |
| 2656 | if (x == x->parent->left) |
| 2657 | { |
| 2658 | struct mem_node *w = x->parent->right; |
| 2659 | |
| 2660 | if (w->color == MEM_RED) |
| 2661 | { |
| 2662 | w->color = MEM_BLACK; |
| 2663 | x->parent->color = MEM_RED; |
| 2664 | mem_rotate_left (x->parent); |
| 2665 | w = x->parent->right; |
| 2666 | } |
| 2667 | |
| 2668 | if (w->left->color == MEM_BLACK && w->right->color == MEM_BLACK) |
| 2669 | { |
| 2670 | w->color = MEM_RED; |
| 2671 | x = x->parent; |
| 2672 | } |
| 2673 | else |
| 2674 | { |
| 2675 | if (w->right->color == MEM_BLACK) |
| 2676 | { |
| 2677 | w->left->color = MEM_BLACK; |
| 2678 | w->color = MEM_RED; |
| 2679 | mem_rotate_right (w); |
| 2680 | w = x->parent->right; |
| 2681 | } |
| 2682 | w->color = x->parent->color; |
| 2683 | x->parent->color = MEM_BLACK; |
| 2684 | w->right->color = MEM_BLACK; |
| 2685 | mem_rotate_left (x->parent); |
| 2686 | x = mem_root; |
| 2687 | } |
| 2688 | } |
| 2689 | else |
| 2690 | { |
| 2691 | struct mem_node *w = x->parent->left; |
| 2692 | |
| 2693 | if (w->color == MEM_RED) |
| 2694 | { |
| 2695 | w->color = MEM_BLACK; |
| 2696 | x->parent->color = MEM_RED; |
| 2697 | mem_rotate_right (x->parent); |
| 2698 | w = x->parent->left; |
| 2699 | } |
| 2700 | |
| 2701 | if (w->right->color == MEM_BLACK && w->left->color == MEM_BLACK) |
| 2702 | { |
| 2703 | w->color = MEM_RED; |
| 2704 | x = x->parent; |
| 2705 | } |
| 2706 | else |
| 2707 | { |
| 2708 | if (w->left->color == MEM_BLACK) |
| 2709 | { |
| 2710 | w->right->color = MEM_BLACK; |
| 2711 | w->color = MEM_RED; |
| 2712 | mem_rotate_left (w); |
| 2713 | w = x->parent->left; |
| 2714 | } |
| 2715 | |
| 2716 | w->color = x->parent->color; |
| 2717 | x->parent->color = MEM_BLACK; |
| 2718 | w->left->color = MEM_BLACK; |
| 2719 | mem_rotate_right (x->parent); |
| 2720 | x = mem_root; |
| 2721 | } |
| 2722 | } |
| 2723 | } |
| 2724 | |
| 2725 | x->color = MEM_BLACK; |
| 2726 | } |
| 2727 | |
| 2728 | |
| 2729 | /* Value is non-zero if P is a pointer to a live Lisp string on |
| 2730 | the heap. M is a pointer to the mem_block for P. */ |
| 2731 | |
| 2732 | static INLINE int |
| 2733 | live_string_p (m, p) |
| 2734 | struct mem_node *m; |
| 2735 | void *p; |
| 2736 | { |
| 2737 | if (m->type == MEM_TYPE_STRING) |
| 2738 | { |
| 2739 | struct string_block *b = (struct string_block *) m->start; |
| 2740 | int offset = (char *) p - (char *) &b->strings[0]; |
| 2741 | |
| 2742 | /* P must point to the start of a Lisp_String structure, and it |
| 2743 | must not be on the free-list. */ |
| 2744 | return (offset % sizeof b->strings[0] == 0 |
| 2745 | && ((struct Lisp_String *) p)->data != NULL); |
| 2746 | } |
| 2747 | else |
| 2748 | return 0; |
| 2749 | } |
| 2750 | |
| 2751 | |
| 2752 | /* Value is non-zero if P is a pointer to a live Lisp cons on |
| 2753 | the heap. M is a pointer to the mem_block for P. */ |
| 2754 | |
| 2755 | static INLINE int |
| 2756 | live_cons_p (m, p) |
| 2757 | struct mem_node *m; |
| 2758 | void *p; |
| 2759 | { |
| 2760 | if (m->type == MEM_TYPE_CONS) |
| 2761 | { |
| 2762 | struct cons_block *b = (struct cons_block *) m->start; |
| 2763 | int offset = (char *) p - (char *) &b->conses[0]; |
| 2764 | |
| 2765 | /* P must point to the start of a Lisp_Cons, not be |
| 2766 | one of the unused cells in the current cons block, |
| 2767 | and not be on the free-list. */ |
| 2768 | return (offset % sizeof b->conses[0] == 0 |
| 2769 | && (b != cons_block |
| 2770 | || offset / sizeof b->conses[0] < cons_block_index) |
| 2771 | && !EQ (((struct Lisp_Cons *) p)->car, Vdead)); |
| 2772 | } |
| 2773 | else |
| 2774 | return 0; |
| 2775 | } |
| 2776 | |
| 2777 | |
| 2778 | /* Value is non-zero if P is a pointer to a live Lisp symbol on |
| 2779 | the heap. M is a pointer to the mem_block for P. */ |
| 2780 | |
| 2781 | static INLINE int |
| 2782 | live_symbol_p (m, p) |
| 2783 | struct mem_node *m; |
| 2784 | void *p; |
| 2785 | { |
| 2786 | if (m->type == MEM_TYPE_SYMBOL) |
| 2787 | { |
| 2788 | struct symbol_block *b = (struct symbol_block *) m->start; |
| 2789 | int offset = (char *) p - (char *) &b->symbols[0]; |
| 2790 | |
| 2791 | /* P must point to the start of a Lisp_Symbol, not be |
| 2792 | one of the unused cells in the current symbol block, |
| 2793 | and not be on the free-list. */ |
| 2794 | return (offset % sizeof b->symbols[0] == 0 |
| 2795 | && (b != symbol_block |
| 2796 | || offset / sizeof b->symbols[0] < symbol_block_index) |
| 2797 | && !EQ (((struct Lisp_Symbol *) p)->function, Vdead)); |
| 2798 | } |
| 2799 | else |
| 2800 | return 0; |
| 2801 | } |
| 2802 | |
| 2803 | |
| 2804 | /* Value is non-zero if P is a pointer to a live Lisp float on |
| 2805 | the heap. M is a pointer to the mem_block for P. */ |
| 2806 | |
| 2807 | static INLINE int |
| 2808 | live_float_p (m, p) |
| 2809 | struct mem_node *m; |
| 2810 | void *p; |
| 2811 | { |
| 2812 | if (m->type == MEM_TYPE_FLOAT) |
| 2813 | { |
| 2814 | struct float_block *b = (struct float_block *) m->start; |
| 2815 | int offset = (char *) p - (char *) &b->floats[0]; |
| 2816 | |
| 2817 | /* P must point to the start of a Lisp_Float, not be |
| 2818 | one of the unused cells in the current float block, |
| 2819 | and not be on the free-list. */ |
| 2820 | return (offset % sizeof b->floats[0] == 0 |
| 2821 | && (b != float_block |
| 2822 | || offset / sizeof b->floats[0] < float_block_index) |
| 2823 | && !EQ (((struct Lisp_Float *) p)->type, Vdead)); |
| 2824 | } |
| 2825 | else |
| 2826 | return 0; |
| 2827 | } |
| 2828 | |
| 2829 | |
| 2830 | /* Value is non-zero if P is a pointer to a live Lisp Misc on |
| 2831 | the heap. M is a pointer to the mem_block for P. */ |
| 2832 | |
| 2833 | static INLINE int |
| 2834 | live_misc_p (m, p) |
| 2835 | struct mem_node *m; |
| 2836 | void *p; |
| 2837 | { |
| 2838 | if (m->type == MEM_TYPE_MISC) |
| 2839 | { |
| 2840 | struct marker_block *b = (struct marker_block *) m->start; |
| 2841 | int offset = (char *) p - (char *) &b->markers[0]; |
| 2842 | |
| 2843 | /* P must point to the start of a Lisp_Misc, not be |
| 2844 | one of the unused cells in the current misc block, |
| 2845 | and not be on the free-list. */ |
| 2846 | return (offset % sizeof b->markers[0] == 0 |
| 2847 | && (b != marker_block |
| 2848 | || offset / sizeof b->markers[0] < marker_block_index) |
| 2849 | && ((union Lisp_Misc *) p)->u_marker.type != Lisp_Misc_Free); |
| 2850 | } |
| 2851 | else |
| 2852 | return 0; |
| 2853 | } |
| 2854 | |
| 2855 | |
| 2856 | /* Value is non-zero if P is a pointer to a live vector-like object. |
| 2857 | M is a pointer to the mem_block for P. */ |
| 2858 | |
| 2859 | static INLINE int |
| 2860 | live_vector_p (m, p) |
| 2861 | struct mem_node *m; |
| 2862 | void *p; |
| 2863 | { |
| 2864 | return m->type == MEM_TYPE_VECTOR && p == m->start; |
| 2865 | } |
| 2866 | |
| 2867 | |
| 2868 | /* Value is non-zero of P is a pointer to a live buffer. M is a |
| 2869 | pointer to the mem_block for P. */ |
| 2870 | |
| 2871 | static INLINE int |
| 2872 | live_buffer_p (m, p) |
| 2873 | struct mem_node *m; |
| 2874 | void *p; |
| 2875 | { |
| 2876 | /* P must point to the start of the block, and the buffer |
| 2877 | must not have been killed. */ |
| 2878 | return (m->type == MEM_TYPE_BUFFER |
| 2879 | && p == m->start |
| 2880 | && !NILP (((struct buffer *) p)->name)); |
| 2881 | } |
| 2882 | |
| 2883 | |
| 2884 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
| 2885 | |
| 2886 | /* Array of objects that are kept alive because the C stack contains |
| 2887 | a pattern that looks like a reference to them . */ |
| 2888 | |
| 2889 | #define MAX_ZOMBIES 10 |
| 2890 | static Lisp_Object zombies[MAX_ZOMBIES]; |
| 2891 | |
| 2892 | /* Number of zombie objects. */ |
| 2893 | |
| 2894 | static int nzombies; |
| 2895 | |
| 2896 | /* Number of garbage collections. */ |
| 2897 | |
| 2898 | static int ngcs; |
| 2899 | |
| 2900 | /* Average percentage of zombies per collection. */ |
| 2901 | |
| 2902 | static double avg_zombies; |
| 2903 | |
| 2904 | /* Max. number of live and zombie objects. */ |
| 2905 | |
| 2906 | static int max_live, max_zombies; |
| 2907 | |
| 2908 | /* Average number of live objects per GC. */ |
| 2909 | |
| 2910 | static double avg_live; |
| 2911 | |
| 2912 | DEFUN ("gc-status", Fgc_status, Sgc_status, 0, 0, "", |
| 2913 | "Show information about live and zombie objects.") |
| 2914 | () |
| 2915 | { |
| 2916 | Lisp_Object args[7]; |
| 2917 | args[0] = build_string ("%d GCs, avg live/zombies = %.2f/%.2f (%f%%), max %d/%d"); |
| 2918 | args[1] = make_number (ngcs); |
| 2919 | args[2] = make_float (avg_live); |
| 2920 | args[3] = make_float (avg_zombies); |
| 2921 | args[4] = make_float (avg_zombies / avg_live / 100); |
| 2922 | args[5] = make_number (max_live); |
| 2923 | args[6] = make_number (max_zombies); |
| 2924 | return Fmessage (7, args); |
| 2925 | } |
| 2926 | |
| 2927 | #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */ |
| 2928 | |
| 2929 | |
| 2930 | /* Mark OBJ if we can prove it's a Lisp_Object. */ |
| 2931 | |
| 2932 | static INLINE void |
| 2933 | mark_maybe_object (obj) |
| 2934 | Lisp_Object obj; |
| 2935 | { |
| 2936 | void *po = (void *) XPNTR (obj); |
| 2937 | struct mem_node *m = mem_find (po); |
| 2938 | |
| 2939 | if (m != MEM_NIL) |
| 2940 | { |
| 2941 | int mark_p = 0; |
| 2942 | |
| 2943 | switch (XGCTYPE (obj)) |
| 2944 | { |
| 2945 | case Lisp_String: |
| 2946 | mark_p = (live_string_p (m, po) |
| 2947 | && !STRING_MARKED_P ((struct Lisp_String *) po)); |
| 2948 | break; |
| 2949 | |
| 2950 | case Lisp_Cons: |
| 2951 | mark_p = (live_cons_p (m, po) |
| 2952 | && !XMARKBIT (XCONS (obj)->car)); |
| 2953 | break; |
| 2954 | |
| 2955 | case Lisp_Symbol: |
| 2956 | mark_p = (live_symbol_p (m, po) |
| 2957 | && !XMARKBIT (XSYMBOL (obj)->plist)); |
| 2958 | break; |
| 2959 | |
| 2960 | case Lisp_Float: |
| 2961 | mark_p = (live_float_p (m, po) |
| 2962 | && !XMARKBIT (XFLOAT (obj)->type)); |
| 2963 | break; |
| 2964 | |
| 2965 | case Lisp_Vectorlike: |
| 2966 | /* Note: can't check GC_BUFFERP before we know it's a |
| 2967 | buffer because checking that dereferences the pointer |
| 2968 | PO which might point anywhere. */ |
| 2969 | if (live_vector_p (m, po)) |
| 2970 | mark_p = (!GC_SUBRP (obj) |
| 2971 | && !(XVECTOR (obj)->size & ARRAY_MARK_FLAG)); |
| 2972 | else if (live_buffer_p (m, po)) |
| 2973 | mark_p = GC_BUFFERP (obj) && !XMARKBIT (XBUFFER (obj)->name); |
| 2974 | break; |
| 2975 | |
| 2976 | case Lisp_Misc: |
| 2977 | if (live_misc_p (m, po)) |
| 2978 | { |
| 2979 | switch (XMISCTYPE (obj)) |
| 2980 | { |
| 2981 | case Lisp_Misc_Marker: |
| 2982 | mark_p = !XMARKBIT (XMARKER (obj)->chain); |
| 2983 | break; |
| 2984 | |
| 2985 | case Lisp_Misc_Buffer_Local_Value: |
| 2986 | case Lisp_Misc_Some_Buffer_Local_Value: |
| 2987 | mark_p = !XMARKBIT (XBUFFER_LOCAL_VALUE (obj)->realvalue); |
| 2988 | break; |
| 2989 | |
| 2990 | case Lisp_Misc_Overlay: |
| 2991 | mark_p = !XMARKBIT (XOVERLAY (obj)->plist); |
| 2992 | break; |
| 2993 | } |
| 2994 | } |
| 2995 | break; |
| 2996 | |
| 2997 | case Lisp_Int: |
| 2998 | case Lisp_Type_Limit: |
| 2999 | break; |
| 3000 | } |
| 3001 | |
| 3002 | if (mark_p) |
| 3003 | { |
| 3004 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
| 3005 | if (nzombies < MAX_ZOMBIES) |
| 3006 | zombies[nzombies] = *p; |
| 3007 | ++nzombies; |
| 3008 | #endif |
| 3009 | mark_object (&obj); |
| 3010 | } |
| 3011 | } |
| 3012 | } |
| 3013 | |
| 3014 | /* Mark Lisp objects in the address range START..END. */ |
| 3015 | |
| 3016 | static void |
| 3017 | mark_memory (start, end) |
| 3018 | void *start, *end; |
| 3019 | { |
| 3020 | Lisp_Object *p; |
| 3021 | |
| 3022 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
| 3023 | nzombies = 0; |
| 3024 | #endif |
| 3025 | |
| 3026 | /* Make START the pointer to the start of the memory region, |
| 3027 | if it isn't already. */ |
| 3028 | if (end < start) |
| 3029 | { |
| 3030 | void *tem = start; |
| 3031 | start = end; |
| 3032 | end = tem; |
| 3033 | } |
| 3034 | |
| 3035 | for (p = (Lisp_Object *) start; (void *) p < end; ++p) |
| 3036 | mark_maybe_object (*p); |
| 3037 | } |
| 3038 | |
| 3039 | |
| 3040 | #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS |
| 3041 | |
| 3042 | static int setjmp_tested_p, longjmps_done; |
| 3043 | |
| 3044 | #define SETJMP_WILL_LIKELY_WORK "\ |
| 3045 | \n\ |
| 3046 | Emacs garbage collector has been changed to use conservative stack\n\ |
| 3047 | marking. Emacs has determined that the method it uses to do the\n\ |
| 3048 | marking will likely work on your system, but this isn't sure.\n\ |
| 3049 | \n\ |
| 3050 | If you are a system-programmer, or can get the help of a local wizard\n\ |
| 3051 | who is, please take a look at the function mark_stack in alloc.c, and\n\ |
| 3052 | verify that the methods used are appropriate for your system.\n\ |
| 3053 | \n\ |
| 3054 | Please mail the result to <gerd@gnu.org>.\n\ |
| 3055 | " |
| 3056 | |
| 3057 | #define SETJMP_WILL_NOT_WORK "\ |
| 3058 | \n\ |
| 3059 | Emacs garbage collector has been changed to use conservative stack\n\ |
| 3060 | marking. Emacs has determined that the default method it uses to do the\n\ |
| 3061 | marking will not work on your system. We will need a system-dependent\n\ |
| 3062 | solution for your system.\n\ |
| 3063 | \n\ |
| 3064 | Please take a look at the function mark_stack in alloc.c, and\n\ |
| 3065 | try to find a way to make it work on your system.\n\ |
| 3066 | Please mail the result to <gerd@gnu.org>.\n\ |
| 3067 | " |
| 3068 | |
| 3069 | |
| 3070 | /* Perform a quick check if it looks like setjmp saves registers in a |
| 3071 | jmp_buf. Print a message to stderr saying so. When this test |
| 3072 | succeeds, this is _not_ a proof that setjmp is sufficient for |
| 3073 | conservative stack marking. Only the sources or a disassembly |
| 3074 | can prove that. */ |
| 3075 | |
| 3076 | static void |
| 3077 | test_setjmp () |
| 3078 | { |
| 3079 | char buf[10]; |
| 3080 | register int x; |
| 3081 | jmp_buf jbuf; |
| 3082 | int result = 0; |
| 3083 | |
| 3084 | /* Arrange for X to be put in a register. */ |
| 3085 | sprintf (buf, "1"); |
| 3086 | x = strlen (buf); |
| 3087 | x = 2 * x - 1; |
| 3088 | |
| 3089 | setjmp (jbuf); |
| 3090 | if (longjmps_done == 1) |
| 3091 | { |
| 3092 | /* Came here after the longjmp at the end of the function. |
| 3093 | |
| 3094 | If x == 1, the longjmp has restored the register to its |
| 3095 | value before the setjmp, and we can hope that setjmp |
| 3096 | saves all such registers in the jmp_buf, although that |
| 3097 | isn't sure. |
| 3098 | |
| 3099 | For other values of X, either something really strange is |
| 3100 | taking place, or the setjmp just didn't save the register. */ |
| 3101 | |
| 3102 | if (x == 1) |
| 3103 | fprintf (stderr, SETJMP_WILL_LIKELY_WORK); |
| 3104 | else |
| 3105 | { |
| 3106 | fprintf (stderr, SETJMP_WILL_NOT_WORK); |
| 3107 | exit (1); |
| 3108 | } |
| 3109 | } |
| 3110 | |
| 3111 | ++longjmps_done; |
| 3112 | x = 2; |
| 3113 | if (longjmps_done == 1) |
| 3114 | longjmp (jbuf, 1); |
| 3115 | } |
| 3116 | |
| 3117 | #endif /* not GC_SAVE_REGISTERS_ON_STACK && not GC_SETJMP_WORKS */ |
| 3118 | |
| 3119 | |
| 3120 | #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS |
| 3121 | |
| 3122 | /* Abort if anything GCPRO'd doesn't survive the GC. */ |
| 3123 | |
| 3124 | static void |
| 3125 | check_gcpros () |
| 3126 | { |
| 3127 | struct gcpro *p; |
| 3128 | int i; |
| 3129 | |
| 3130 | for (p = gcprolist; p; p = p->next) |
| 3131 | for (i = 0; i < p->nvars; ++i) |
| 3132 | if (!survives_gc_p (p->var[i])) |
| 3133 | abort (); |
| 3134 | } |
| 3135 | |
| 3136 | #elif GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
| 3137 | |
| 3138 | static void |
| 3139 | dump_zombies () |
| 3140 | { |
| 3141 | int i; |
| 3142 | |
| 3143 | fprintf (stderr, "\nZombies kept alive = %d:\n", nzombies); |
| 3144 | for (i = 0; i < min (MAX_ZOMBIES, nzombies); ++i) |
| 3145 | { |
| 3146 | fprintf (stderr, " %d = ", i); |
| 3147 | debug_print (zombies[i]); |
| 3148 | } |
| 3149 | } |
| 3150 | |
| 3151 | #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */ |
| 3152 | |
| 3153 | |
| 3154 | /* Mark live Lisp objects on the C stack. |
| 3155 | |
| 3156 | There are several system-dependent problems to consider when |
| 3157 | porting this to new architectures: |
| 3158 | |
| 3159 | Processor Registers |
| 3160 | |
| 3161 | We have to mark Lisp objects in CPU registers that can hold local |
| 3162 | variables or are used to pass parameters. |
| 3163 | |
| 3164 | If GC_SAVE_REGISTERS_ON_STACK is defined, it should expand to |
| 3165 | something that either saves relevant registers on the stack, or |
| 3166 | calls mark_maybe_object passing it each register's contents. |
| 3167 | |
| 3168 | If GC_SAVE_REGISTERS_ON_STACK is not defined, the current |
| 3169 | implementation assumes that calling setjmp saves registers we need |
| 3170 | to see in a jmp_buf which itself lies on the stack. This doesn't |
| 3171 | have to be true! It must be verified for each system, possibly |
| 3172 | by taking a look at the source code of setjmp. |
| 3173 | |
| 3174 | Stack Layout |
| 3175 | |
| 3176 | Architectures differ in the way their processor stack is organized. |
| 3177 | For example, the stack might look like this |
| 3178 | |
| 3179 | +----------------+ |
| 3180 | | Lisp_Object | size = 4 |
| 3181 | +----------------+ |
| 3182 | | something else | size = 2 |
| 3183 | +----------------+ |
| 3184 | | Lisp_Object | size = 4 |
| 3185 | +----------------+ |
| 3186 | | ... | |
| 3187 | |
| 3188 | In such a case, not every Lisp_Object will be aligned equally. To |
| 3189 | find all Lisp_Object on the stack it won't be sufficient to walk |
| 3190 | the stack in steps of 4 bytes. Instead, two passes will be |
| 3191 | necessary, one starting at the start of the stack, and a second |
| 3192 | pass starting at the start of the stack + 2. Likewise, if the |
| 3193 | minimal alignment of Lisp_Objects on the stack is 1, four passes |
| 3194 | would be necessary, each one starting with one byte more offset |
| 3195 | from the stack start. |
| 3196 | |
| 3197 | The current code assumes by default that Lisp_Objects are aligned |
| 3198 | equally on the stack. */ |
| 3199 | |
| 3200 | static void |
| 3201 | mark_stack () |
| 3202 | { |
| 3203 | jmp_buf j; |
| 3204 | volatile int stack_grows_down_p = (char *) &j > (char *) stack_base; |
| 3205 | void *end; |
| 3206 | |
| 3207 | /* This trick flushes the register windows so that all the state of |
| 3208 | the process is contained in the stack. */ |
| 3209 | #ifdef sparc |
| 3210 | asm ("ta 3"); |
| 3211 | #endif |
| 3212 | |
| 3213 | /* Save registers that we need to see on the stack. We need to see |
| 3214 | registers used to hold register variables and registers used to |
| 3215 | pass parameters. */ |
| 3216 | #ifdef GC_SAVE_REGISTERS_ON_STACK |
| 3217 | GC_SAVE_REGISTERS_ON_STACK (end); |
| 3218 | #else /* not GC_SAVE_REGISTERS_ON_STACK */ |
| 3219 | |
| 3220 | #ifndef GC_SETJMP_WORKS /* If it hasn't been checked yet that |
| 3221 | setjmp will definitely work, test it |
| 3222 | and print a message with the result |
| 3223 | of the test. */ |
| 3224 | if (!setjmp_tested_p) |
| 3225 | { |
| 3226 | setjmp_tested_p = 1; |
| 3227 | test_setjmp (); |
| 3228 | } |
| 3229 | #endif /* GC_SETJMP_WORKS */ |
| 3230 | |
| 3231 | setjmp (j); |
| 3232 | end = stack_grows_down_p ? (char *) &j + sizeof j : (char *) &j; |
| 3233 | #endif /* not GC_SAVE_REGISTERS_ON_STACK */ |
| 3234 | |
| 3235 | /* This assumes that the stack is a contiguous region in memory. If |
| 3236 | that's not the case, something has to be done here to iterate |
| 3237 | over the stack segments. */ |
| 3238 | #if GC_LISP_OBJECT_ALIGNMENT == 1 |
| 3239 | mark_memory (stack_base, end); |
| 3240 | mark_memory ((char *) stack_base + 1, end); |
| 3241 | mark_memory ((char *) stack_base + 2, end); |
| 3242 | mark_memory ((char *) stack_base + 3, end); |
| 3243 | #elif GC_LISP_OBJECT_ALIGNMENT == 2 |
| 3244 | mark_memory (stack_base, end); |
| 3245 | mark_memory ((char *) stack_base + 2, end); |
| 3246 | #else |
| 3247 | mark_memory (stack_base, end); |
| 3248 | #endif |
| 3249 | |
| 3250 | #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS |
| 3251 | check_gcpros (); |
| 3252 | #endif |
| 3253 | } |
| 3254 | |
| 3255 | |
| 3256 | #endif /* GC_MARK_STACK != 0 */ |
| 3257 | |
| 3258 | |
| 3259 | \f |
| 3260 | /*********************************************************************** |
| 3261 | Pure Storage Management |
| 3262 | ***********************************************************************/ |
| 3263 | |
| 3264 | /* Return a string allocated in pure space. DATA is a buffer holding |
| 3265 | NCHARS characters, and NBYTES bytes of string data. MULTIBYTE |
| 3266 | non-zero means make the result string multibyte. |
| 3267 | |
| 3268 | Must get an error if pure storage is full, since if it cannot hold |
| 3269 | a large string it may be able to hold conses that point to that |
| 3270 | string; then the string is not protected from gc. */ |
| 3271 | |
| 3272 | Lisp_Object |
| 3273 | make_pure_string (data, nchars, nbytes, multibyte) |
| 3274 | char *data; |
| 3275 | int nchars, nbytes; |
| 3276 | int multibyte; |
| 3277 | { |
| 3278 | Lisp_Object string; |
| 3279 | struct Lisp_String *s; |
| 3280 | int string_size, data_size; |
| 3281 | |
| 3282 | #define PAD(SZ) (((SZ) + sizeof (EMACS_INT) - 1) & ~(sizeof (EMACS_INT) - 1)) |
| 3283 | |
| 3284 | string_size = PAD (sizeof (struct Lisp_String)); |
| 3285 | data_size = PAD (nbytes + 1); |
| 3286 | |
| 3287 | #undef PAD |
| 3288 | |
| 3289 | if (pureptr + string_size + data_size > PURESIZE) |
| 3290 | error ("Pure Lisp storage exhausted"); |
| 3291 | |
| 3292 | s = (struct Lisp_String *) (PUREBEG + pureptr); |
| 3293 | pureptr += string_size; |
| 3294 | s->data = (unsigned char *) (PUREBEG + pureptr); |
| 3295 | pureptr += data_size; |
| 3296 | |
| 3297 | s->size = nchars; |
| 3298 | s->size_byte = multibyte ? nbytes : -1; |
| 3299 | bcopy (data, s->data, nbytes); |
| 3300 | s->data[nbytes] = '\0'; |
| 3301 | s->intervals = NULL_INTERVAL; |
| 3302 | |
| 3303 | XSETSTRING (string, s); |
| 3304 | return string; |
| 3305 | } |
| 3306 | |
| 3307 | |
| 3308 | /* Return a cons allocated from pure space. Give it pure copies |
| 3309 | of CAR as car and CDR as cdr. */ |
| 3310 | |
| 3311 | Lisp_Object |
| 3312 | pure_cons (car, cdr) |
| 3313 | Lisp_Object car, cdr; |
| 3314 | { |
| 3315 | register Lisp_Object new; |
| 3316 | |
| 3317 | if (pureptr + sizeof (struct Lisp_Cons) > PURESIZE) |
| 3318 | error ("Pure Lisp storage exhausted"); |
| 3319 | XSETCONS (new, PUREBEG + pureptr); |
| 3320 | pureptr += sizeof (struct Lisp_Cons); |
| 3321 | XCAR (new) = Fpurecopy (car); |
| 3322 | XCDR (new) = Fpurecopy (cdr); |
| 3323 | return new; |
| 3324 | } |
| 3325 | |
| 3326 | |
| 3327 | /* Value is a float object with value NUM allocated from pure space. */ |
| 3328 | |
| 3329 | Lisp_Object |
| 3330 | make_pure_float (num) |
| 3331 | double num; |
| 3332 | { |
| 3333 | register Lisp_Object new; |
| 3334 | |
| 3335 | /* Make sure that PUREBEG + pureptr is aligned on at least a sizeof |
| 3336 | (double) boundary. Some architectures (like the sparc) require |
| 3337 | this, and I suspect that floats are rare enough that it's no |
| 3338 | tragedy for those that do. */ |
| 3339 | { |
| 3340 | size_t alignment; |
| 3341 | char *p = PUREBEG + pureptr; |
| 3342 | |
| 3343 | #ifdef __GNUC__ |
| 3344 | #if __GNUC__ >= 2 |
| 3345 | alignment = __alignof (struct Lisp_Float); |
| 3346 | #else |
| 3347 | alignment = sizeof (struct Lisp_Float); |
| 3348 | #endif |
| 3349 | #else |
| 3350 | alignment = sizeof (struct Lisp_Float); |
| 3351 | #endif |
| 3352 | p = (char *) (((unsigned long) p + alignment - 1) & - alignment); |
| 3353 | pureptr = p - PUREBEG; |
| 3354 | } |
| 3355 | |
| 3356 | if (pureptr + sizeof (struct Lisp_Float) > PURESIZE) |
| 3357 | error ("Pure Lisp storage exhausted"); |
| 3358 | XSETFLOAT (new, PUREBEG + pureptr); |
| 3359 | pureptr += sizeof (struct Lisp_Float); |
| 3360 | XFLOAT_DATA (new) = num; |
| 3361 | XSETFASTINT (XFLOAT (new)->type, 0); /* bug chasing -wsr */ |
| 3362 | return new; |
| 3363 | } |
| 3364 | |
| 3365 | |
| 3366 | /* Return a vector with room for LEN Lisp_Objects allocated from |
| 3367 | pure space. */ |
| 3368 | |
| 3369 | Lisp_Object |
| 3370 | make_pure_vector (len) |
| 3371 | EMACS_INT len; |
| 3372 | { |
| 3373 | register Lisp_Object new; |
| 3374 | register EMACS_INT size = (sizeof (struct Lisp_Vector) |
| 3375 | + (len - 1) * sizeof (Lisp_Object)); |
| 3376 | |
| 3377 | if (pureptr + size > PURESIZE) |
| 3378 | error ("Pure Lisp storage exhausted"); |
| 3379 | |
| 3380 | XSETVECTOR (new, PUREBEG + pureptr); |
| 3381 | pureptr += size; |
| 3382 | XVECTOR (new)->size = len; |
| 3383 | return new; |
| 3384 | } |
| 3385 | |
| 3386 | |
| 3387 | DEFUN ("purecopy", Fpurecopy, Spurecopy, 1, 1, 0, |
| 3388 | "Make a copy of OBJECT in pure storage.\n\ |
| 3389 | Recursively copies contents of vectors and cons cells.\n\ |
| 3390 | Does not copy symbols. Copies strings without text properties.") |
| 3391 | (obj) |
| 3392 | register Lisp_Object obj; |
| 3393 | { |
| 3394 | if (NILP (Vpurify_flag)) |
| 3395 | return obj; |
| 3396 | |
| 3397 | if ((PNTR_COMPARISON_TYPE) XPNTR (obj) < (PNTR_COMPARISON_TYPE) ((char *) pure + PURESIZE) |
| 3398 | && (PNTR_COMPARISON_TYPE) XPNTR (obj) >= (PNTR_COMPARISON_TYPE) pure) |
| 3399 | return obj; |
| 3400 | |
| 3401 | if (CONSP (obj)) |
| 3402 | return pure_cons (XCAR (obj), XCDR (obj)); |
| 3403 | else if (FLOATP (obj)) |
| 3404 | return make_pure_float (XFLOAT_DATA (obj)); |
| 3405 | else if (STRINGP (obj)) |
| 3406 | return make_pure_string (XSTRING (obj)->data, XSTRING (obj)->size, |
| 3407 | STRING_BYTES (XSTRING (obj)), |
| 3408 | STRING_MULTIBYTE (obj)); |
| 3409 | else if (COMPILEDP (obj) || VECTORP (obj)) |
| 3410 | { |
| 3411 | register struct Lisp_Vector *vec; |
| 3412 | register int i, size; |
| 3413 | |
| 3414 | size = XVECTOR (obj)->size; |
| 3415 | if (size & PSEUDOVECTOR_FLAG) |
| 3416 | size &= PSEUDOVECTOR_SIZE_MASK; |
| 3417 | vec = XVECTOR (make_pure_vector ((EMACS_INT) size)); |
| 3418 | for (i = 0; i < size; i++) |
| 3419 | vec->contents[i] = Fpurecopy (XVECTOR (obj)->contents[i]); |
| 3420 | if (COMPILEDP (obj)) |
| 3421 | XSETCOMPILED (obj, vec); |
| 3422 | else |
| 3423 | XSETVECTOR (obj, vec); |
| 3424 | return obj; |
| 3425 | } |
| 3426 | else if (MARKERP (obj)) |
| 3427 | error ("Attempt to copy a marker to pure storage"); |
| 3428 | |
| 3429 | return obj; |
| 3430 | } |
| 3431 | |
| 3432 | |
| 3433 | \f |
| 3434 | /*********************************************************************** |
| 3435 | Protection from GC |
| 3436 | ***********************************************************************/ |
| 3437 | |
| 3438 | /* Recording what needs to be marked for gc. */ |
| 3439 | |
| 3440 | struct gcpro *gcprolist; |
| 3441 | |
| 3442 | /* Addresses of staticpro'd variables. */ |
| 3443 | |
| 3444 | #define NSTATICS 1024 |
| 3445 | Lisp_Object *staticvec[NSTATICS] = {0}; |
| 3446 | |
| 3447 | /* Index of next unused slot in staticvec. */ |
| 3448 | |
| 3449 | int staticidx = 0; |
| 3450 | |
| 3451 | |
| 3452 | /* Put an entry in staticvec, pointing at the variable with address |
| 3453 | VARADDRESS. */ |
| 3454 | |
| 3455 | void |
| 3456 | staticpro (varaddress) |
| 3457 | Lisp_Object *varaddress; |
| 3458 | { |
| 3459 | staticvec[staticidx++] = varaddress; |
| 3460 | if (staticidx >= NSTATICS) |
| 3461 | abort (); |
| 3462 | } |
| 3463 | |
| 3464 | struct catchtag |
| 3465 | { |
| 3466 | Lisp_Object tag; |
| 3467 | Lisp_Object val; |
| 3468 | struct catchtag *next; |
| 3469 | }; |
| 3470 | |
| 3471 | struct backtrace |
| 3472 | { |
| 3473 | struct backtrace *next; |
| 3474 | Lisp_Object *function; |
| 3475 | Lisp_Object *args; /* Points to vector of args. */ |
| 3476 | int nargs; /* Length of vector. */ |
| 3477 | /* If nargs is UNEVALLED, args points to slot holding list of |
| 3478 | unevalled args. */ |
| 3479 | char evalargs; |
| 3480 | }; |
| 3481 | |
| 3482 | |
| 3483 | \f |
| 3484 | /*********************************************************************** |
| 3485 | Protection from GC |
| 3486 | ***********************************************************************/ |
| 3487 | |
| 3488 | /* Temporarily prevent garbage collection. */ |
| 3489 | |
| 3490 | int |
| 3491 | inhibit_garbage_collection () |
| 3492 | { |
| 3493 | int count = specpdl_ptr - specpdl; |
| 3494 | Lisp_Object number; |
| 3495 | int nbits = min (VALBITS, BITS_PER_INT); |
| 3496 | |
| 3497 | XSETINT (number, ((EMACS_INT) 1 << (nbits - 1)) - 1); |
| 3498 | |
| 3499 | specbind (Qgc_cons_threshold, number); |
| 3500 | |
| 3501 | return count; |
| 3502 | } |
| 3503 | |
| 3504 | |
| 3505 | DEFUN ("garbage-collect", Fgarbage_collect, Sgarbage_collect, 0, 0, "", |
| 3506 | "Reclaim storage for Lisp objects no longer needed.\n\ |
| 3507 | Returns info on amount of space in use:\n\ |
| 3508 | ((USED-CONSES . FREE-CONSES) (USED-SYMS . FREE-SYMS)\n\ |
| 3509 | (USED-MARKERS . FREE-MARKERS) USED-STRING-CHARS USED-VECTOR-SLOTS\n\ |
| 3510 | (USED-FLOATS . FREE-FLOATS) (USED-INTERVALS . FREE-INTERVALS\n\ |
| 3511 | (USED-STRINGS . FREE-STRINGS))\n\ |
| 3512 | Garbage collection happens automatically if you cons more than\n\ |
| 3513 | `gc-cons-threshold' bytes of Lisp data since previous garbage collection.") |
| 3514 | () |
| 3515 | { |
| 3516 | register struct gcpro *tail; |
| 3517 | register struct specbinding *bind; |
| 3518 | struct catchtag *catch; |
| 3519 | struct handler *handler; |
| 3520 | register struct backtrace *backlist; |
| 3521 | char stack_top_variable; |
| 3522 | register int i; |
| 3523 | int message_p; |
| 3524 | Lisp_Object total[7]; |
| 3525 | |
| 3526 | /* In case user calls debug_print during GC, |
| 3527 | don't let that cause a recursive GC. */ |
| 3528 | consing_since_gc = 0; |
| 3529 | |
| 3530 | /* Save what's currently displayed in the echo area. */ |
| 3531 | message_p = push_message (); |
| 3532 | |
| 3533 | /* Save a copy of the contents of the stack, for debugging. */ |
| 3534 | #if MAX_SAVE_STACK > 0 |
| 3535 | if (NILP (Vpurify_flag)) |
| 3536 | { |
| 3537 | i = &stack_top_variable - stack_bottom; |
| 3538 | if (i < 0) i = -i; |
| 3539 | if (i < MAX_SAVE_STACK) |
| 3540 | { |
| 3541 | if (stack_copy == 0) |
| 3542 | stack_copy = (char *) xmalloc (stack_copy_size = i); |
| 3543 | else if (stack_copy_size < i) |
| 3544 | stack_copy = (char *) xrealloc (stack_copy, (stack_copy_size = i)); |
| 3545 | if (stack_copy) |
| 3546 | { |
| 3547 | if ((EMACS_INT) (&stack_top_variable - stack_bottom) > 0) |
| 3548 | bcopy (stack_bottom, stack_copy, i); |
| 3549 | else |
| 3550 | bcopy (&stack_top_variable, stack_copy, i); |
| 3551 | } |
| 3552 | } |
| 3553 | } |
| 3554 | #endif /* MAX_SAVE_STACK > 0 */ |
| 3555 | |
| 3556 | if (garbage_collection_messages) |
| 3557 | message1_nolog ("Garbage collecting..."); |
| 3558 | |
| 3559 | BLOCK_INPUT; |
| 3560 | |
| 3561 | shrink_regexp_cache (); |
| 3562 | |
| 3563 | /* Don't keep undo information around forever. */ |
| 3564 | { |
| 3565 | register struct buffer *nextb = all_buffers; |
| 3566 | |
| 3567 | while (nextb) |
| 3568 | { |
| 3569 | /* If a buffer's undo list is Qt, that means that undo is |
| 3570 | turned off in that buffer. Calling truncate_undo_list on |
| 3571 | Qt tends to return NULL, which effectively turns undo back on. |
| 3572 | So don't call truncate_undo_list if undo_list is Qt. */ |
| 3573 | if (! EQ (nextb->undo_list, Qt)) |
| 3574 | nextb->undo_list |
| 3575 | = truncate_undo_list (nextb->undo_list, undo_limit, |
| 3576 | undo_strong_limit); |
| 3577 | nextb = nextb->next; |
| 3578 | } |
| 3579 | } |
| 3580 | |
| 3581 | gc_in_progress = 1; |
| 3582 | |
| 3583 | /* clear_marks (); */ |
| 3584 | |
| 3585 | /* Mark all the special slots that serve as the roots of accessibility. |
| 3586 | |
| 3587 | Usually the special slots to mark are contained in particular structures. |
| 3588 | Then we know no slot is marked twice because the structures don't overlap. |
| 3589 | In some cases, the structures point to the slots to be marked. |
| 3590 | For these, we use MARKBIT to avoid double marking of the slot. */ |
| 3591 | |
| 3592 | for (i = 0; i < staticidx; i++) |
| 3593 | mark_object (staticvec[i]); |
| 3594 | |
| 3595 | #if (GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS \ |
| 3596 | || GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS) |
| 3597 | mark_stack (); |
| 3598 | #else |
| 3599 | for (tail = gcprolist; tail; tail = tail->next) |
| 3600 | for (i = 0; i < tail->nvars; i++) |
| 3601 | if (!XMARKBIT (tail->var[i])) |
| 3602 | { |
| 3603 | mark_object (&tail->var[i]); |
| 3604 | XMARK (tail->var[i]); |
| 3605 | } |
| 3606 | #endif |
| 3607 | |
| 3608 | mark_byte_stack (); |
| 3609 | for (bind = specpdl; bind != specpdl_ptr; bind++) |
| 3610 | { |
| 3611 | mark_object (&bind->symbol); |
| 3612 | mark_object (&bind->old_value); |
| 3613 | } |
| 3614 | for (catch = catchlist; catch; catch = catch->next) |
| 3615 | { |
| 3616 | mark_object (&catch->tag); |
| 3617 | mark_object (&catch->val); |
| 3618 | } |
| 3619 | for (handler = handlerlist; handler; handler = handler->next) |
| 3620 | { |
| 3621 | mark_object (&handler->handler); |
| 3622 | mark_object (&handler->var); |
| 3623 | } |
| 3624 | for (backlist = backtrace_list; backlist; backlist = backlist->next) |
| 3625 | { |
| 3626 | if (!XMARKBIT (*backlist->function)) |
| 3627 | { |
| 3628 | mark_object (backlist->function); |
| 3629 | XMARK (*backlist->function); |
| 3630 | } |
| 3631 | if (backlist->nargs == UNEVALLED || backlist->nargs == MANY) |
| 3632 | i = 0; |
| 3633 | else |
| 3634 | i = backlist->nargs - 1; |
| 3635 | for (; i >= 0; i--) |
| 3636 | if (!XMARKBIT (backlist->args[i])) |
| 3637 | { |
| 3638 | mark_object (&backlist->args[i]); |
| 3639 | XMARK (backlist->args[i]); |
| 3640 | } |
| 3641 | } |
| 3642 | mark_kboards (); |
| 3643 | |
| 3644 | /* Look thru every buffer's undo list |
| 3645 | for elements that update markers that were not marked, |
| 3646 | and delete them. */ |
| 3647 | { |
| 3648 | register struct buffer *nextb = all_buffers; |
| 3649 | |
| 3650 | while (nextb) |
| 3651 | { |
| 3652 | /* If a buffer's undo list is Qt, that means that undo is |
| 3653 | turned off in that buffer. Calling truncate_undo_list on |
| 3654 | Qt tends to return NULL, which effectively turns undo back on. |
| 3655 | So don't call truncate_undo_list if undo_list is Qt. */ |
| 3656 | if (! EQ (nextb->undo_list, Qt)) |
| 3657 | { |
| 3658 | Lisp_Object tail, prev; |
| 3659 | tail = nextb->undo_list; |
| 3660 | prev = Qnil; |
| 3661 | while (CONSP (tail)) |
| 3662 | { |
| 3663 | if (GC_CONSP (XCAR (tail)) |
| 3664 | && GC_MARKERP (XCAR (XCAR (tail))) |
| 3665 | && ! XMARKBIT (XMARKER (XCAR (XCAR (tail)))->chain)) |
| 3666 | { |
| 3667 | if (NILP (prev)) |
| 3668 | nextb->undo_list = tail = XCDR (tail); |
| 3669 | else |
| 3670 | tail = XCDR (prev) = XCDR (tail); |
| 3671 | } |
| 3672 | else |
| 3673 | { |
| 3674 | prev = tail; |
| 3675 | tail = XCDR (tail); |
| 3676 | } |
| 3677 | } |
| 3678 | } |
| 3679 | |
| 3680 | nextb = nextb->next; |
| 3681 | } |
| 3682 | } |
| 3683 | |
| 3684 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
| 3685 | mark_stack (); |
| 3686 | #endif |
| 3687 | |
| 3688 | gc_sweep (); |
| 3689 | |
| 3690 | /* Clear the mark bits that we set in certain root slots. */ |
| 3691 | |
| 3692 | #if (GC_MARK_STACK == GC_USE_GCPROS_AS_BEFORE \ |
| 3693 | || GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES) |
| 3694 | for (tail = gcprolist; tail; tail = tail->next) |
| 3695 | for (i = 0; i < tail->nvars; i++) |
| 3696 | XUNMARK (tail->var[i]); |
| 3697 | #endif |
| 3698 | |
| 3699 | unmark_byte_stack (); |
| 3700 | for (backlist = backtrace_list; backlist; backlist = backlist->next) |
| 3701 | { |
| 3702 | XUNMARK (*backlist->function); |
| 3703 | if (backlist->nargs == UNEVALLED || backlist->nargs == MANY) |
| 3704 | i = 0; |
| 3705 | else |
| 3706 | i = backlist->nargs - 1; |
| 3707 | for (; i >= 0; i--) |
| 3708 | XUNMARK (backlist->args[i]); |
| 3709 | } |
| 3710 | XUNMARK (buffer_defaults.name); |
| 3711 | XUNMARK (buffer_local_symbols.name); |
| 3712 | |
| 3713 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES && 0 |
| 3714 | dump_zombies (); |
| 3715 | #endif |
| 3716 | |
| 3717 | UNBLOCK_INPUT; |
| 3718 | |
| 3719 | /* clear_marks (); */ |
| 3720 | gc_in_progress = 0; |
| 3721 | |
| 3722 | consing_since_gc = 0; |
| 3723 | if (gc_cons_threshold < 10000) |
| 3724 | gc_cons_threshold = 10000; |
| 3725 | |
| 3726 | if (garbage_collection_messages) |
| 3727 | { |
| 3728 | if (message_p || minibuf_level > 0) |
| 3729 | restore_message (); |
| 3730 | else |
| 3731 | message1_nolog ("Garbage collecting...done"); |
| 3732 | } |
| 3733 | |
| 3734 | pop_message (); |
| 3735 | |
| 3736 | total[0] = Fcons (make_number (total_conses), |
| 3737 | make_number (total_free_conses)); |
| 3738 | total[1] = Fcons (make_number (total_symbols), |
| 3739 | make_number (total_free_symbols)); |
| 3740 | total[2] = Fcons (make_number (total_markers), |
| 3741 | make_number (total_free_markers)); |
| 3742 | total[3] = Fcons (make_number (total_string_size), |
| 3743 | make_number (total_vector_size)); |
| 3744 | total[4] = Fcons (make_number (total_floats), |
| 3745 | make_number (total_free_floats)); |
| 3746 | total[5] = Fcons (make_number (total_intervals), |
| 3747 | make_number (total_free_intervals)); |
| 3748 | total[6] = Fcons (make_number (total_strings), |
| 3749 | make_number (total_free_strings)); |
| 3750 | |
| 3751 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
| 3752 | { |
| 3753 | /* Compute average percentage of zombies. */ |
| 3754 | double nlive = 0; |
| 3755 | |
| 3756 | for (i = 0; i < 7; ++i) |
| 3757 | nlive += XFASTINT (XCAR (total[i])); |
| 3758 | |
| 3759 | avg_live = (avg_live * ngcs + nlive) / (ngcs + 1); |
| 3760 | max_live = max (nlive, max_live); |
| 3761 | avg_zombies = (avg_zombies * ngcs + nzombies) / (ngcs + 1); |
| 3762 | max_zombies = max (nzombies, max_zombies); |
| 3763 | ++ngcs; |
| 3764 | } |
| 3765 | #endif |
| 3766 | |
| 3767 | return Flist (7, total); |
| 3768 | } |
| 3769 | |
| 3770 | |
| 3771 | /* Mark Lisp objects in glyph matrix MATRIX. Currently the |
| 3772 | only interesting objects referenced from glyphs are strings. */ |
| 3773 | |
| 3774 | static void |
| 3775 | mark_glyph_matrix (matrix) |
| 3776 | struct glyph_matrix *matrix; |
| 3777 | { |
| 3778 | struct glyph_row *row = matrix->rows; |
| 3779 | struct glyph_row *end = row + matrix->nrows; |
| 3780 | |
| 3781 | for (; row < end; ++row) |
| 3782 | if (row->enabled_p) |
| 3783 | { |
| 3784 | int area; |
| 3785 | for (area = LEFT_MARGIN_AREA; area < LAST_AREA; ++area) |
| 3786 | { |
| 3787 | struct glyph *glyph = row->glyphs[area]; |
| 3788 | struct glyph *end_glyph = glyph + row->used[area]; |
| 3789 | |
| 3790 | for (; glyph < end_glyph; ++glyph) |
| 3791 | if (GC_STRINGP (glyph->object) |
| 3792 | && !STRING_MARKED_P (XSTRING (glyph->object))) |
| 3793 | mark_object (&glyph->object); |
| 3794 | } |
| 3795 | } |
| 3796 | } |
| 3797 | |
| 3798 | |
| 3799 | /* Mark Lisp faces in the face cache C. */ |
| 3800 | |
| 3801 | static void |
| 3802 | mark_face_cache (c) |
| 3803 | struct face_cache *c; |
| 3804 | { |
| 3805 | if (c) |
| 3806 | { |
| 3807 | int i, j; |
| 3808 | for (i = 0; i < c->used; ++i) |
| 3809 | { |
| 3810 | struct face *face = FACE_FROM_ID (c->f, i); |
| 3811 | |
| 3812 | if (face) |
| 3813 | { |
| 3814 | for (j = 0; j < LFACE_VECTOR_SIZE; ++j) |
| 3815 | mark_object (&face->lface[j]); |
| 3816 | } |
| 3817 | } |
| 3818 | } |
| 3819 | } |
| 3820 | |
| 3821 | |
| 3822 | #ifdef HAVE_WINDOW_SYSTEM |
| 3823 | |
| 3824 | /* Mark Lisp objects in image IMG. */ |
| 3825 | |
| 3826 | static void |
| 3827 | mark_image (img) |
| 3828 | struct image *img; |
| 3829 | { |
| 3830 | mark_object (&img->spec); |
| 3831 | |
| 3832 | if (!NILP (img->data.lisp_val)) |
| 3833 | mark_object (&img->data.lisp_val); |
| 3834 | } |
| 3835 | |
| 3836 | |
| 3837 | /* Mark Lisp objects in image cache of frame F. It's done this way so |
| 3838 | that we don't have to include xterm.h here. */ |
| 3839 | |
| 3840 | static void |
| 3841 | mark_image_cache (f) |
| 3842 | struct frame *f; |
| 3843 | { |
| 3844 | forall_images_in_image_cache (f, mark_image); |
| 3845 | } |
| 3846 | |
| 3847 | #endif /* HAVE_X_WINDOWS */ |
| 3848 | |
| 3849 | |
| 3850 | \f |
| 3851 | /* Mark reference to a Lisp_Object. |
| 3852 | If the object referred to has not been seen yet, recursively mark |
| 3853 | all the references contained in it. */ |
| 3854 | |
| 3855 | #define LAST_MARKED_SIZE 500 |
| 3856 | Lisp_Object *last_marked[LAST_MARKED_SIZE]; |
| 3857 | int last_marked_index; |
| 3858 | |
| 3859 | void |
| 3860 | mark_object (argptr) |
| 3861 | Lisp_Object *argptr; |
| 3862 | { |
| 3863 | Lisp_Object *objptr = argptr; |
| 3864 | register Lisp_Object obj; |
| 3865 | #ifdef GC_CHECK_MARKED_OBJECTS |
| 3866 | void *po; |
| 3867 | struct mem_node *m; |
| 3868 | #endif |
| 3869 | |
| 3870 | loop: |
| 3871 | obj = *objptr; |
| 3872 | loop2: |
| 3873 | XUNMARK (obj); |
| 3874 | |
| 3875 | if (PURE_POINTER_P ((PNTR_COMPARISON_TYPE) XPNTR (obj))) |
| 3876 | return; |
| 3877 | |
| 3878 | last_marked[last_marked_index++] = objptr; |
| 3879 | if (last_marked_index == LAST_MARKED_SIZE) |
| 3880 | last_marked_index = 0; |
| 3881 | |
| 3882 | /* Perform some sanity checks on the objects marked here. Abort if |
| 3883 | we encounter an object we know is bogus. This increases GC time |
| 3884 | by ~80%, and requires compilation with GC_MARK_STACK != 0. */ |
| 3885 | #ifdef GC_CHECK_MARKED_OBJECTS |
| 3886 | |
| 3887 | po = (void *) XPNTR (obj); |
| 3888 | |
| 3889 | /* Check that the object pointed to by PO is known to be a Lisp |
| 3890 | structure allocated from the heap. */ |
| 3891 | #define CHECK_ALLOCATED() \ |
| 3892 | do { \ |
| 3893 | m = mem_find (po); \ |
| 3894 | if (m == MEM_NIL) \ |
| 3895 | abort (); \ |
| 3896 | } while (0) |
| 3897 | |
| 3898 | /* Check that the object pointed to by PO is live, using predicate |
| 3899 | function LIVEP. */ |
| 3900 | #define CHECK_LIVE(LIVEP) \ |
| 3901 | do { \ |
| 3902 | if (!LIVEP (m, po)) \ |
| 3903 | abort (); \ |
| 3904 | } while (0) |
| 3905 | |
| 3906 | /* Check both of the above conditions. */ |
| 3907 | #define CHECK_ALLOCATED_AND_LIVE(LIVEP) \ |
| 3908 | do { \ |
| 3909 | CHECK_ALLOCATED (); \ |
| 3910 | CHECK_LIVE (LIVEP); \ |
| 3911 | } while (0) \ |
| 3912 | |
| 3913 | #else /* not GC_CHECK_MARKED_OBJECTS */ |
| 3914 | |
| 3915 | #define CHECK_ALLOCATED() (void) 0 |
| 3916 | #define CHECK_LIVE(LIVEP) (void) 0 |
| 3917 | #define CHECK_ALLOCATED_AND_LIVE(LIVEP) (void) 0 |
| 3918 | |
| 3919 | #endif /* not GC_CHECK_MARKED_OBJECTS */ |
| 3920 | |
| 3921 | switch (SWITCH_ENUM_CAST (XGCTYPE (obj))) |
| 3922 | { |
| 3923 | case Lisp_String: |
| 3924 | { |
| 3925 | register struct Lisp_String *ptr = XSTRING (obj); |
| 3926 | CHECK_ALLOCATED_AND_LIVE (live_string_p); |
| 3927 | MARK_INTERVAL_TREE (ptr->intervals); |
| 3928 | MARK_STRING (ptr); |
| 3929 | } |
| 3930 | break; |
| 3931 | |
| 3932 | case Lisp_Vectorlike: |
| 3933 | #ifdef GC_CHECK_MARKED_OBJECTS |
| 3934 | m = mem_find (po); |
| 3935 | if (m == MEM_NIL && !GC_SUBRP (obj) |
| 3936 | && po != &buffer_defaults |
| 3937 | && po != &buffer_local_symbols) |
| 3938 | abort (); |
| 3939 | #endif /* GC_CHECK_MARKED_OBJECTS */ |
| 3940 | |
| 3941 | if (GC_BUFFERP (obj)) |
| 3942 | { |
| 3943 | if (!XMARKBIT (XBUFFER (obj)->name)) |
| 3944 | { |
| 3945 | #ifdef GC_CHECK_MARKED_OBJECTS |
| 3946 | if (po != &buffer_defaults && po != &buffer_local_symbols) |
| 3947 | { |
| 3948 | struct buffer *b; |
| 3949 | for (b = all_buffers; b && b != po; b = b->next) |
| 3950 | ; |
| 3951 | if (b == NULL) |
| 3952 | abort (); |
| 3953 | } |
| 3954 | #endif /* GC_CHECK_MARKED_OBJECTS */ |
| 3955 | mark_buffer (obj); |
| 3956 | } |
| 3957 | } |
| 3958 | else if (GC_SUBRP (obj)) |
| 3959 | break; |
| 3960 | else if (GC_COMPILEDP (obj)) |
| 3961 | /* We could treat this just like a vector, but it is better to |
| 3962 | save the COMPILED_CONSTANTS element for last and avoid |
| 3963 | recursion there. */ |
| 3964 | { |
| 3965 | register struct Lisp_Vector *ptr = XVECTOR (obj); |
| 3966 | register EMACS_INT size = ptr->size; |
| 3967 | /* See comment above under Lisp_Vector. */ |
| 3968 | struct Lisp_Vector *volatile ptr1 = ptr; |
| 3969 | register int i; |
| 3970 | |
| 3971 | if (size & ARRAY_MARK_FLAG) |
| 3972 | break; /* Already marked */ |
| 3973 | |
| 3974 | CHECK_LIVE (live_vector_p); |
| 3975 | ptr->size |= ARRAY_MARK_FLAG; /* Else mark it */ |
| 3976 | size &= PSEUDOVECTOR_SIZE_MASK; |
| 3977 | for (i = 0; i < size; i++) /* and then mark its elements */ |
| 3978 | { |
| 3979 | if (i != COMPILED_CONSTANTS) |
| 3980 | mark_object (&ptr1->contents[i]); |
| 3981 | } |
| 3982 | /* This cast should be unnecessary, but some Mips compiler complains |
| 3983 | (MIPS-ABI + SysVR4, DC/OSx, etc). */ |
| 3984 | objptr = (Lisp_Object *) &ptr1->contents[COMPILED_CONSTANTS]; |
| 3985 | goto loop; |
| 3986 | } |
| 3987 | else if (GC_FRAMEP (obj)) |
| 3988 | { |
| 3989 | /* See comment above under Lisp_Vector for why this is volatile. */ |
| 3990 | register struct frame *volatile ptr = XFRAME (obj); |
| 3991 | register EMACS_INT size = ptr->size; |
| 3992 | |
| 3993 | if (size & ARRAY_MARK_FLAG) break; /* Already marked */ |
| 3994 | ptr->size |= ARRAY_MARK_FLAG; /* Else mark it */ |
| 3995 | |
| 3996 | CHECK_LIVE (live_vector_p); |
| 3997 | mark_object (&ptr->name); |
| 3998 | mark_object (&ptr->icon_name); |
| 3999 | mark_object (&ptr->title); |
| 4000 | mark_object (&ptr->focus_frame); |
| 4001 | mark_object (&ptr->selected_window); |
| 4002 | mark_object (&ptr->minibuffer_window); |
| 4003 | mark_object (&ptr->param_alist); |
| 4004 | mark_object (&ptr->scroll_bars); |
| 4005 | mark_object (&ptr->condemned_scroll_bars); |
| 4006 | mark_object (&ptr->menu_bar_items); |
| 4007 | mark_object (&ptr->face_alist); |
| 4008 | mark_object (&ptr->menu_bar_vector); |
| 4009 | mark_object (&ptr->buffer_predicate); |
| 4010 | mark_object (&ptr->buffer_list); |
| 4011 | mark_object (&ptr->menu_bar_window); |
| 4012 | mark_object (&ptr->tool_bar_window); |
| 4013 | mark_face_cache (ptr->face_cache); |
| 4014 | #ifdef HAVE_WINDOW_SYSTEM |
| 4015 | mark_image_cache (ptr); |
| 4016 | mark_object (&ptr->desired_tool_bar_items); |
| 4017 | mark_object (&ptr->current_tool_bar_items); |
| 4018 | mark_object (&ptr->desired_tool_bar_string); |
| 4019 | mark_object (&ptr->current_tool_bar_string); |
| 4020 | #endif /* HAVE_WINDOW_SYSTEM */ |
| 4021 | } |
| 4022 | else if (GC_BOOL_VECTOR_P (obj)) |
| 4023 | { |
| 4024 | register struct Lisp_Vector *ptr = XVECTOR (obj); |
| 4025 | |
| 4026 | if (ptr->size & ARRAY_MARK_FLAG) |
| 4027 | break; /* Already marked */ |
| 4028 | CHECK_LIVE (live_vector_p); |
| 4029 | ptr->size |= ARRAY_MARK_FLAG; /* Else mark it */ |
| 4030 | } |
| 4031 | else if (GC_WINDOWP (obj)) |
| 4032 | { |
| 4033 | register struct Lisp_Vector *ptr = XVECTOR (obj); |
| 4034 | struct window *w = XWINDOW (obj); |
| 4035 | register EMACS_INT size = ptr->size; |
| 4036 | /* The reason we use ptr1 is to avoid an apparent hardware bug |
| 4037 | that happens occasionally on the FSF's HP 300s. |
| 4038 | The bug is that a2 gets clobbered by recursive calls to mark_object. |
| 4039 | The clobberage seems to happen during function entry, |
| 4040 | perhaps in the moveml instruction. |
| 4041 | Yes, this is a crock, but we have to do it. */ |
| 4042 | struct Lisp_Vector *volatile ptr1 = ptr; |
| 4043 | register int i; |
| 4044 | |
| 4045 | /* Stop if already marked. */ |
| 4046 | if (size & ARRAY_MARK_FLAG) |
| 4047 | break; |
| 4048 | |
| 4049 | /* Mark it. */ |
| 4050 | CHECK_LIVE (live_vector_p); |
| 4051 | ptr->size |= ARRAY_MARK_FLAG; |
| 4052 | |
| 4053 | /* There is no Lisp data above The member CURRENT_MATRIX in |
| 4054 | struct WINDOW. Stop marking when that slot is reached. */ |
| 4055 | for (i = 0; |
| 4056 | (char *) &ptr1->contents[i] < (char *) &w->current_matrix; |
| 4057 | i++) |
| 4058 | mark_object (&ptr1->contents[i]); |
| 4059 | |
| 4060 | /* Mark glyphs for leaf windows. Marking window matrices is |
| 4061 | sufficient because frame matrices use the same glyph |
| 4062 | memory. */ |
| 4063 | if (NILP (w->hchild) |
| 4064 | && NILP (w->vchild) |
| 4065 | && w->current_matrix) |
| 4066 | { |
| 4067 | mark_glyph_matrix (w->current_matrix); |
| 4068 | mark_glyph_matrix (w->desired_matrix); |
| 4069 | } |
| 4070 | } |
| 4071 | else if (GC_HASH_TABLE_P (obj)) |
| 4072 | { |
| 4073 | struct Lisp_Hash_Table *h = XHASH_TABLE (obj); |
| 4074 | EMACS_INT size = h->size; |
| 4075 | |
| 4076 | /* Stop if already marked. */ |
| 4077 | if (size & ARRAY_MARK_FLAG) |
| 4078 | break; |
| 4079 | |
| 4080 | /* Mark it. */ |
| 4081 | CHECK_LIVE (live_vector_p); |
| 4082 | h->size |= ARRAY_MARK_FLAG; |
| 4083 | |
| 4084 | /* Mark contents. */ |
| 4085 | mark_object (&h->test); |
| 4086 | mark_object (&h->weak); |
| 4087 | mark_object (&h->rehash_size); |
| 4088 | mark_object (&h->rehash_threshold); |
| 4089 | mark_object (&h->hash); |
| 4090 | mark_object (&h->next); |
| 4091 | mark_object (&h->index); |
| 4092 | mark_object (&h->user_hash_function); |
| 4093 | mark_object (&h->user_cmp_function); |
| 4094 | |
| 4095 | /* If hash table is not weak, mark all keys and values. |
| 4096 | For weak tables, mark only the vector. */ |
| 4097 | if (GC_NILP (h->weak)) |
| 4098 | mark_object (&h->key_and_value); |
| 4099 | else |
| 4100 | XVECTOR (h->key_and_value)->size |= ARRAY_MARK_FLAG; |
| 4101 | |
| 4102 | } |
| 4103 | else |
| 4104 | { |
| 4105 | register struct Lisp_Vector *ptr = XVECTOR (obj); |
| 4106 | register EMACS_INT size = ptr->size; |
| 4107 | /* The reason we use ptr1 is to avoid an apparent hardware bug |
| 4108 | that happens occasionally on the FSF's HP 300s. |
| 4109 | The bug is that a2 gets clobbered by recursive calls to mark_object. |
| 4110 | The clobberage seems to happen during function entry, |
| 4111 | perhaps in the moveml instruction. |
| 4112 | Yes, this is a crock, but we have to do it. */ |
| 4113 | struct Lisp_Vector *volatile ptr1 = ptr; |
| 4114 | register int i; |
| 4115 | |
| 4116 | if (size & ARRAY_MARK_FLAG) break; /* Already marked */ |
| 4117 | CHECK_LIVE (live_vector_p); |
| 4118 | ptr->size |= ARRAY_MARK_FLAG; /* Else mark it */ |
| 4119 | if (size & PSEUDOVECTOR_FLAG) |
| 4120 | size &= PSEUDOVECTOR_SIZE_MASK; |
| 4121 | |
| 4122 | for (i = 0; i < size; i++) /* and then mark its elements */ |
| 4123 | mark_object (&ptr1->contents[i]); |
| 4124 | } |
| 4125 | break; |
| 4126 | |
| 4127 | case Lisp_Symbol: |
| 4128 | { |
| 4129 | /* See comment above under Lisp_Vector for why this is volatile. */ |
| 4130 | register struct Lisp_Symbol *volatile ptr = XSYMBOL (obj); |
| 4131 | struct Lisp_Symbol *ptrx; |
| 4132 | |
| 4133 | if (XMARKBIT (ptr->plist)) break; |
| 4134 | CHECK_ALLOCATED_AND_LIVE (live_symbol_p); |
| 4135 | XMARK (ptr->plist); |
| 4136 | mark_object ((Lisp_Object *) &ptr->value); |
| 4137 | mark_object (&ptr->function); |
| 4138 | mark_object (&ptr->plist); |
| 4139 | |
| 4140 | if (!PURE_POINTER_P (ptr->name)) |
| 4141 | MARK_STRING (ptr->name); |
| 4142 | MARK_INTERVAL_TREE (ptr->name->intervals); |
| 4143 | |
| 4144 | /* Note that we do not mark the obarray of the symbol. |
| 4145 | It is safe not to do so because nothing accesses that |
| 4146 | slot except to check whether it is nil. */ |
| 4147 | ptr = ptr->next; |
| 4148 | if (ptr) |
| 4149 | { |
| 4150 | /* For the benefit of the last_marked log. */ |
| 4151 | objptr = (Lisp_Object *)&XSYMBOL (obj)->next; |
| 4152 | ptrx = ptr; /* Use of ptrx avoids compiler bug on Sun */ |
| 4153 | XSETSYMBOL (obj, ptrx); |
| 4154 | /* We can't goto loop here because *objptr doesn't contain an |
| 4155 | actual Lisp_Object with valid datatype field. */ |
| 4156 | goto loop2; |
| 4157 | } |
| 4158 | } |
| 4159 | break; |
| 4160 | |
| 4161 | case Lisp_Misc: |
| 4162 | CHECK_ALLOCATED_AND_LIVE (live_misc_p); |
| 4163 | switch (XMISCTYPE (obj)) |
| 4164 | { |
| 4165 | case Lisp_Misc_Marker: |
| 4166 | XMARK (XMARKER (obj)->chain); |
| 4167 | /* DO NOT mark thru the marker's chain. |
| 4168 | The buffer's markers chain does not preserve markers from gc; |
| 4169 | instead, markers are removed from the chain when freed by gc. */ |
| 4170 | break; |
| 4171 | |
| 4172 | case Lisp_Misc_Buffer_Local_Value: |
| 4173 | case Lisp_Misc_Some_Buffer_Local_Value: |
| 4174 | { |
| 4175 | register struct Lisp_Buffer_Local_Value *ptr |
| 4176 | = XBUFFER_LOCAL_VALUE (obj); |
| 4177 | if (XMARKBIT (ptr->realvalue)) break; |
| 4178 | XMARK (ptr->realvalue); |
| 4179 | /* If the cdr is nil, avoid recursion for the car. */ |
| 4180 | if (EQ (ptr->cdr, Qnil)) |
| 4181 | { |
| 4182 | objptr = &ptr->realvalue; |
| 4183 | goto loop; |
| 4184 | } |
| 4185 | mark_object (&ptr->realvalue); |
| 4186 | mark_object (&ptr->buffer); |
| 4187 | mark_object (&ptr->frame); |
| 4188 | /* See comment above under Lisp_Vector for why not use ptr here. */ |
| 4189 | objptr = &XBUFFER_LOCAL_VALUE (obj)->cdr; |
| 4190 | goto loop; |
| 4191 | } |
| 4192 | |
| 4193 | case Lisp_Misc_Intfwd: |
| 4194 | case Lisp_Misc_Boolfwd: |
| 4195 | case Lisp_Misc_Objfwd: |
| 4196 | case Lisp_Misc_Buffer_Objfwd: |
| 4197 | case Lisp_Misc_Kboard_Objfwd: |
| 4198 | /* Don't bother with Lisp_Buffer_Objfwd, |
| 4199 | since all markable slots in current buffer marked anyway. */ |
| 4200 | /* Don't need to do Lisp_Objfwd, since the places they point |
| 4201 | are protected with staticpro. */ |
| 4202 | break; |
| 4203 | |
| 4204 | case Lisp_Misc_Overlay: |
| 4205 | { |
| 4206 | struct Lisp_Overlay *ptr = XOVERLAY (obj); |
| 4207 | if (!XMARKBIT (ptr->plist)) |
| 4208 | { |
| 4209 | XMARK (ptr->plist); |
| 4210 | mark_object (&ptr->start); |
| 4211 | mark_object (&ptr->end); |
| 4212 | objptr = &ptr->plist; |
| 4213 | goto loop; |
| 4214 | } |
| 4215 | } |
| 4216 | break; |
| 4217 | |
| 4218 | default: |
| 4219 | abort (); |
| 4220 | } |
| 4221 | break; |
| 4222 | |
| 4223 | case Lisp_Cons: |
| 4224 | { |
| 4225 | register struct Lisp_Cons *ptr = XCONS (obj); |
| 4226 | if (XMARKBIT (ptr->car)) break; |
| 4227 | CHECK_ALLOCATED_AND_LIVE (live_cons_p); |
| 4228 | XMARK (ptr->car); |
| 4229 | /* If the cdr is nil, avoid recursion for the car. */ |
| 4230 | if (EQ (ptr->cdr, Qnil)) |
| 4231 | { |
| 4232 | objptr = &ptr->car; |
| 4233 | goto loop; |
| 4234 | } |
| 4235 | mark_object (&ptr->car); |
| 4236 | /* See comment above under Lisp_Vector for why not use ptr here. */ |
| 4237 | objptr = &XCDR (obj); |
| 4238 | goto loop; |
| 4239 | } |
| 4240 | |
| 4241 | case Lisp_Float: |
| 4242 | CHECK_ALLOCATED_AND_LIVE (live_float_p); |
| 4243 | XMARK (XFLOAT (obj)->type); |
| 4244 | break; |
| 4245 | |
| 4246 | case Lisp_Int: |
| 4247 | break; |
| 4248 | |
| 4249 | default: |
| 4250 | abort (); |
| 4251 | } |
| 4252 | |
| 4253 | #undef CHECK_LIVE |
| 4254 | #undef CHECK_ALLOCATED |
| 4255 | #undef CHECK_ALLOCATED_AND_LIVE |
| 4256 | } |
| 4257 | |
| 4258 | /* Mark the pointers in a buffer structure. */ |
| 4259 | |
| 4260 | static void |
| 4261 | mark_buffer (buf) |
| 4262 | Lisp_Object buf; |
| 4263 | { |
| 4264 | register struct buffer *buffer = XBUFFER (buf); |
| 4265 | register Lisp_Object *ptr; |
| 4266 | Lisp_Object base_buffer; |
| 4267 | |
| 4268 | /* This is the buffer's markbit */ |
| 4269 | mark_object (&buffer->name); |
| 4270 | XMARK (buffer->name); |
| 4271 | |
| 4272 | MARK_INTERVAL_TREE (BUF_INTERVALS (buffer)); |
| 4273 | |
| 4274 | if (CONSP (buffer->undo_list)) |
| 4275 | { |
| 4276 | Lisp_Object tail; |
| 4277 | tail = buffer->undo_list; |
| 4278 | |
| 4279 | while (CONSP (tail)) |
| 4280 | { |
| 4281 | register struct Lisp_Cons *ptr = XCONS (tail); |
| 4282 | |
| 4283 | if (XMARKBIT (ptr->car)) |
| 4284 | break; |
| 4285 | XMARK (ptr->car); |
| 4286 | if (GC_CONSP (ptr->car) |
| 4287 | && ! XMARKBIT (XCAR (ptr->car)) |
| 4288 | && GC_MARKERP (XCAR (ptr->car))) |
| 4289 | { |
| 4290 | XMARK (XCAR (ptr->car)); |
| 4291 | mark_object (&XCDR (ptr->car)); |
| 4292 | } |
| 4293 | else |
| 4294 | mark_object (&ptr->car); |
| 4295 | |
| 4296 | if (CONSP (ptr->cdr)) |
| 4297 | tail = ptr->cdr; |
| 4298 | else |
| 4299 | break; |
| 4300 | } |
| 4301 | |
| 4302 | mark_object (&XCDR (tail)); |
| 4303 | } |
| 4304 | else |
| 4305 | mark_object (&buffer->undo_list); |
| 4306 | |
| 4307 | for (ptr = &buffer->name + 1; |
| 4308 | (char *)ptr < (char *)buffer + sizeof (struct buffer); |
| 4309 | ptr++) |
| 4310 | mark_object (ptr); |
| 4311 | |
| 4312 | /* If this is an indirect buffer, mark its base buffer. */ |
| 4313 | if (buffer->base_buffer && !XMARKBIT (buffer->base_buffer->name)) |
| 4314 | { |
| 4315 | XSETBUFFER (base_buffer, buffer->base_buffer); |
| 4316 | mark_buffer (base_buffer); |
| 4317 | } |
| 4318 | } |
| 4319 | |
| 4320 | |
| 4321 | /* Mark the pointers in the kboard objects. */ |
| 4322 | |
| 4323 | static void |
| 4324 | mark_kboards () |
| 4325 | { |
| 4326 | KBOARD *kb; |
| 4327 | Lisp_Object *p; |
| 4328 | for (kb = all_kboards; kb; kb = kb->next_kboard) |
| 4329 | { |
| 4330 | if (kb->kbd_macro_buffer) |
| 4331 | for (p = kb->kbd_macro_buffer; p < kb->kbd_macro_ptr; p++) |
| 4332 | mark_object (p); |
| 4333 | mark_object (&kb->Voverriding_terminal_local_map); |
| 4334 | mark_object (&kb->Vlast_command); |
| 4335 | mark_object (&kb->Vreal_last_command); |
| 4336 | mark_object (&kb->Vprefix_arg); |
| 4337 | mark_object (&kb->Vlast_prefix_arg); |
| 4338 | mark_object (&kb->kbd_queue); |
| 4339 | mark_object (&kb->defining_kbd_macro); |
| 4340 | mark_object (&kb->Vlast_kbd_macro); |
| 4341 | mark_object (&kb->Vsystem_key_alist); |
| 4342 | mark_object (&kb->system_key_syms); |
| 4343 | mark_object (&kb->Vdefault_minibuffer_frame); |
| 4344 | } |
| 4345 | } |
| 4346 | |
| 4347 | |
| 4348 | /* Value is non-zero if OBJ will survive the current GC because it's |
| 4349 | either marked or does not need to be marked to survive. */ |
| 4350 | |
| 4351 | int |
| 4352 | survives_gc_p (obj) |
| 4353 | Lisp_Object obj; |
| 4354 | { |
| 4355 | int survives_p; |
| 4356 | |
| 4357 | switch (XGCTYPE (obj)) |
| 4358 | { |
| 4359 | case Lisp_Int: |
| 4360 | survives_p = 1; |
| 4361 | break; |
| 4362 | |
| 4363 | case Lisp_Symbol: |
| 4364 | survives_p = XMARKBIT (XSYMBOL (obj)->plist); |
| 4365 | break; |
| 4366 | |
| 4367 | case Lisp_Misc: |
| 4368 | switch (XMISCTYPE (obj)) |
| 4369 | { |
| 4370 | case Lisp_Misc_Marker: |
| 4371 | survives_p = XMARKBIT (obj); |
| 4372 | break; |
| 4373 | |
| 4374 | case Lisp_Misc_Buffer_Local_Value: |
| 4375 | case Lisp_Misc_Some_Buffer_Local_Value: |
| 4376 | survives_p = XMARKBIT (XBUFFER_LOCAL_VALUE (obj)->realvalue); |
| 4377 | break; |
| 4378 | |
| 4379 | case Lisp_Misc_Intfwd: |
| 4380 | case Lisp_Misc_Boolfwd: |
| 4381 | case Lisp_Misc_Objfwd: |
| 4382 | case Lisp_Misc_Buffer_Objfwd: |
| 4383 | case Lisp_Misc_Kboard_Objfwd: |
| 4384 | survives_p = 1; |
| 4385 | break; |
| 4386 | |
| 4387 | case Lisp_Misc_Overlay: |
| 4388 | survives_p = XMARKBIT (XOVERLAY (obj)->plist); |
| 4389 | break; |
| 4390 | |
| 4391 | default: |
| 4392 | abort (); |
| 4393 | } |
| 4394 | break; |
| 4395 | |
| 4396 | case Lisp_String: |
| 4397 | { |
| 4398 | struct Lisp_String *s = XSTRING (obj); |
| 4399 | survives_p = STRING_MARKED_P (s); |
| 4400 | } |
| 4401 | break; |
| 4402 | |
| 4403 | case Lisp_Vectorlike: |
| 4404 | if (GC_BUFFERP (obj)) |
| 4405 | survives_p = XMARKBIT (XBUFFER (obj)->name); |
| 4406 | else if (GC_SUBRP (obj)) |
| 4407 | survives_p = 1; |
| 4408 | else |
| 4409 | survives_p = XVECTOR (obj)->size & ARRAY_MARK_FLAG; |
| 4410 | break; |
| 4411 | |
| 4412 | case Lisp_Cons: |
| 4413 | survives_p = XMARKBIT (XCAR (obj)); |
| 4414 | break; |
| 4415 | |
| 4416 | case Lisp_Float: |
| 4417 | survives_p = XMARKBIT (XFLOAT (obj)->type); |
| 4418 | break; |
| 4419 | |
| 4420 | default: |
| 4421 | abort (); |
| 4422 | } |
| 4423 | |
| 4424 | return survives_p || PURE_POINTER_P ((void *) XPNTR (obj)); |
| 4425 | } |
| 4426 | |
| 4427 | |
| 4428 | \f |
| 4429 | /* Sweep: find all structures not marked, and free them. */ |
| 4430 | |
| 4431 | static void |
| 4432 | gc_sweep () |
| 4433 | { |
| 4434 | /* Remove or mark entries in weak hash tables. |
| 4435 | This must be done before any object is unmarked. */ |
| 4436 | sweep_weak_hash_tables (); |
| 4437 | |
| 4438 | sweep_strings (); |
| 4439 | |
| 4440 | /* Put all unmarked conses on free list */ |
| 4441 | { |
| 4442 | register struct cons_block *cblk; |
| 4443 | struct cons_block **cprev = &cons_block; |
| 4444 | register int lim = cons_block_index; |
| 4445 | register int num_free = 0, num_used = 0; |
| 4446 | |
| 4447 | cons_free_list = 0; |
| 4448 | |
| 4449 | for (cblk = cons_block; cblk; cblk = *cprev) |
| 4450 | { |
| 4451 | register int i; |
| 4452 | int this_free = 0; |
| 4453 | for (i = 0; i < lim; i++) |
| 4454 | if (!XMARKBIT (cblk->conses[i].car)) |
| 4455 | { |
| 4456 | this_free++; |
| 4457 | *(struct Lisp_Cons **)&cblk->conses[i].cdr = cons_free_list; |
| 4458 | cons_free_list = &cblk->conses[i]; |
| 4459 | #if GC_MARK_STACK |
| 4460 | cons_free_list->car = Vdead; |
| 4461 | #endif |
| 4462 | } |
| 4463 | else |
| 4464 | { |
| 4465 | num_used++; |
| 4466 | XUNMARK (cblk->conses[i].car); |
| 4467 | } |
| 4468 | lim = CONS_BLOCK_SIZE; |
| 4469 | /* If this block contains only free conses and we have already |
| 4470 | seen more than two blocks worth of free conses then deallocate |
| 4471 | this block. */ |
| 4472 | if (this_free == CONS_BLOCK_SIZE && num_free > CONS_BLOCK_SIZE) |
| 4473 | { |
| 4474 | *cprev = cblk->next; |
| 4475 | /* Unhook from the free list. */ |
| 4476 | cons_free_list = *(struct Lisp_Cons **) &cblk->conses[0].cdr; |
| 4477 | lisp_free (cblk); |
| 4478 | n_cons_blocks--; |
| 4479 | } |
| 4480 | else |
| 4481 | { |
| 4482 | num_free += this_free; |
| 4483 | cprev = &cblk->next; |
| 4484 | } |
| 4485 | } |
| 4486 | total_conses = num_used; |
| 4487 | total_free_conses = num_free; |
| 4488 | } |
| 4489 | |
| 4490 | /* Put all unmarked floats on free list */ |
| 4491 | { |
| 4492 | register struct float_block *fblk; |
| 4493 | struct float_block **fprev = &float_block; |
| 4494 | register int lim = float_block_index; |
| 4495 | register int num_free = 0, num_used = 0; |
| 4496 | |
| 4497 | float_free_list = 0; |
| 4498 | |
| 4499 | for (fblk = float_block; fblk; fblk = *fprev) |
| 4500 | { |
| 4501 | register int i; |
| 4502 | int this_free = 0; |
| 4503 | for (i = 0; i < lim; i++) |
| 4504 | if (!XMARKBIT (fblk->floats[i].type)) |
| 4505 | { |
| 4506 | this_free++; |
| 4507 | *(struct Lisp_Float **)&fblk->floats[i].data = float_free_list; |
| 4508 | float_free_list = &fblk->floats[i]; |
| 4509 | #if GC_MARK_STACK |
| 4510 | float_free_list->type = Vdead; |
| 4511 | #endif |
| 4512 | } |
| 4513 | else |
| 4514 | { |
| 4515 | num_used++; |
| 4516 | XUNMARK (fblk->floats[i].type); |
| 4517 | } |
| 4518 | lim = FLOAT_BLOCK_SIZE; |
| 4519 | /* If this block contains only free floats and we have already |
| 4520 | seen more than two blocks worth of free floats then deallocate |
| 4521 | this block. */ |
| 4522 | if (this_free == FLOAT_BLOCK_SIZE && num_free > FLOAT_BLOCK_SIZE) |
| 4523 | { |
| 4524 | *fprev = fblk->next; |
| 4525 | /* Unhook from the free list. */ |
| 4526 | float_free_list = *(struct Lisp_Float **) &fblk->floats[0].data; |
| 4527 | lisp_free (fblk); |
| 4528 | n_float_blocks--; |
| 4529 | } |
| 4530 | else |
| 4531 | { |
| 4532 | num_free += this_free; |
| 4533 | fprev = &fblk->next; |
| 4534 | } |
| 4535 | } |
| 4536 | total_floats = num_used; |
| 4537 | total_free_floats = num_free; |
| 4538 | } |
| 4539 | |
| 4540 | /* Put all unmarked intervals on free list */ |
| 4541 | { |
| 4542 | register struct interval_block *iblk; |
| 4543 | struct interval_block **iprev = &interval_block; |
| 4544 | register int lim = interval_block_index; |
| 4545 | register int num_free = 0, num_used = 0; |
| 4546 | |
| 4547 | interval_free_list = 0; |
| 4548 | |
| 4549 | for (iblk = interval_block; iblk; iblk = *iprev) |
| 4550 | { |
| 4551 | register int i; |
| 4552 | int this_free = 0; |
| 4553 | |
| 4554 | for (i = 0; i < lim; i++) |
| 4555 | { |
| 4556 | if (! XMARKBIT (iblk->intervals[i].plist)) |
| 4557 | { |
| 4558 | SET_INTERVAL_PARENT (&iblk->intervals[i], interval_free_list); |
| 4559 | interval_free_list = &iblk->intervals[i]; |
| 4560 | this_free++; |
| 4561 | } |
| 4562 | else |
| 4563 | { |
| 4564 | num_used++; |
| 4565 | XUNMARK (iblk->intervals[i].plist); |
| 4566 | } |
| 4567 | } |
| 4568 | lim = INTERVAL_BLOCK_SIZE; |
| 4569 | /* If this block contains only free intervals and we have already |
| 4570 | seen more than two blocks worth of free intervals then |
| 4571 | deallocate this block. */ |
| 4572 | if (this_free == INTERVAL_BLOCK_SIZE && num_free > INTERVAL_BLOCK_SIZE) |
| 4573 | { |
| 4574 | *iprev = iblk->next; |
| 4575 | /* Unhook from the free list. */ |
| 4576 | interval_free_list = INTERVAL_PARENT (&iblk->intervals[0]); |
| 4577 | lisp_free (iblk); |
| 4578 | n_interval_blocks--; |
| 4579 | } |
| 4580 | else |
| 4581 | { |
| 4582 | num_free += this_free; |
| 4583 | iprev = &iblk->next; |
| 4584 | } |
| 4585 | } |
| 4586 | total_intervals = num_used; |
| 4587 | total_free_intervals = num_free; |
| 4588 | } |
| 4589 | |
| 4590 | /* Put all unmarked symbols on free list */ |
| 4591 | { |
| 4592 | register struct symbol_block *sblk; |
| 4593 | struct symbol_block **sprev = &symbol_block; |
| 4594 | register int lim = symbol_block_index; |
| 4595 | register int num_free = 0, num_used = 0; |
| 4596 | |
| 4597 | symbol_free_list = 0; |
| 4598 | |
| 4599 | for (sblk = symbol_block; sblk; sblk = *sprev) |
| 4600 | { |
| 4601 | register int i; |
| 4602 | int this_free = 0; |
| 4603 | for (i = 0; i < lim; i++) |
| 4604 | if (!XMARKBIT (sblk->symbols[i].plist)) |
| 4605 | { |
| 4606 | *(struct Lisp_Symbol **)&sblk->symbols[i].value = symbol_free_list; |
| 4607 | symbol_free_list = &sblk->symbols[i]; |
| 4608 | #if GC_MARK_STACK |
| 4609 | symbol_free_list->function = Vdead; |
| 4610 | #endif |
| 4611 | this_free++; |
| 4612 | } |
| 4613 | else |
| 4614 | { |
| 4615 | num_used++; |
| 4616 | if (!PURE_POINTER_P (sblk->symbols[i].name)) |
| 4617 | UNMARK_STRING (sblk->symbols[i].name); |
| 4618 | XUNMARK (sblk->symbols[i].plist); |
| 4619 | } |
| 4620 | lim = SYMBOL_BLOCK_SIZE; |
| 4621 | /* If this block contains only free symbols and we have already |
| 4622 | seen more than two blocks worth of free symbols then deallocate |
| 4623 | this block. */ |
| 4624 | if (this_free == SYMBOL_BLOCK_SIZE && num_free > SYMBOL_BLOCK_SIZE) |
| 4625 | { |
| 4626 | *sprev = sblk->next; |
| 4627 | /* Unhook from the free list. */ |
| 4628 | symbol_free_list = *(struct Lisp_Symbol **)&sblk->symbols[0].value; |
| 4629 | lisp_free (sblk); |
| 4630 | n_symbol_blocks--; |
| 4631 | } |
| 4632 | else |
| 4633 | { |
| 4634 | num_free += this_free; |
| 4635 | sprev = &sblk->next; |
| 4636 | } |
| 4637 | } |
| 4638 | total_symbols = num_used; |
| 4639 | total_free_symbols = num_free; |
| 4640 | } |
| 4641 | |
| 4642 | /* Put all unmarked misc's on free list. |
| 4643 | For a marker, first unchain it from the buffer it points into. */ |
| 4644 | { |
| 4645 | register struct marker_block *mblk; |
| 4646 | struct marker_block **mprev = &marker_block; |
| 4647 | register int lim = marker_block_index; |
| 4648 | register int num_free = 0, num_used = 0; |
| 4649 | |
| 4650 | marker_free_list = 0; |
| 4651 | |
| 4652 | for (mblk = marker_block; mblk; mblk = *mprev) |
| 4653 | { |
| 4654 | register int i; |
| 4655 | int this_free = 0; |
| 4656 | EMACS_INT already_free = -1; |
| 4657 | |
| 4658 | for (i = 0; i < lim; i++) |
| 4659 | { |
| 4660 | Lisp_Object *markword; |
| 4661 | switch (mblk->markers[i].u_marker.type) |
| 4662 | { |
| 4663 | case Lisp_Misc_Marker: |
| 4664 | markword = &mblk->markers[i].u_marker.chain; |
| 4665 | break; |
| 4666 | case Lisp_Misc_Buffer_Local_Value: |
| 4667 | case Lisp_Misc_Some_Buffer_Local_Value: |
| 4668 | markword = &mblk->markers[i].u_buffer_local_value.realvalue; |
| 4669 | break; |
| 4670 | case Lisp_Misc_Overlay: |
| 4671 | markword = &mblk->markers[i].u_overlay.plist; |
| 4672 | break; |
| 4673 | case Lisp_Misc_Free: |
| 4674 | /* If the object was already free, keep it |
| 4675 | on the free list. */ |
| 4676 | markword = (Lisp_Object *) &already_free; |
| 4677 | break; |
| 4678 | default: |
| 4679 | markword = 0; |
| 4680 | break; |
| 4681 | } |
| 4682 | if (markword && !XMARKBIT (*markword)) |
| 4683 | { |
| 4684 | Lisp_Object tem; |
| 4685 | if (mblk->markers[i].u_marker.type == Lisp_Misc_Marker) |
| 4686 | { |
| 4687 | /* tem1 avoids Sun compiler bug */ |
| 4688 | struct Lisp_Marker *tem1 = &mblk->markers[i].u_marker; |
| 4689 | XSETMARKER (tem, tem1); |
| 4690 | unchain_marker (tem); |
| 4691 | } |
| 4692 | /* Set the type of the freed object to Lisp_Misc_Free. |
| 4693 | We could leave the type alone, since nobody checks it, |
| 4694 | but this might catch bugs faster. */ |
| 4695 | mblk->markers[i].u_marker.type = Lisp_Misc_Free; |
| 4696 | mblk->markers[i].u_free.chain = marker_free_list; |
| 4697 | marker_free_list = &mblk->markers[i]; |
| 4698 | this_free++; |
| 4699 | } |
| 4700 | else |
| 4701 | { |
| 4702 | num_used++; |
| 4703 | if (markword) |
| 4704 | XUNMARK (*markword); |
| 4705 | } |
| 4706 | } |
| 4707 | lim = MARKER_BLOCK_SIZE; |
| 4708 | /* If this block contains only free markers and we have already |
| 4709 | seen more than two blocks worth of free markers then deallocate |
| 4710 | this block. */ |
| 4711 | if (this_free == MARKER_BLOCK_SIZE && num_free > MARKER_BLOCK_SIZE) |
| 4712 | { |
| 4713 | *mprev = mblk->next; |
| 4714 | /* Unhook from the free list. */ |
| 4715 | marker_free_list = mblk->markers[0].u_free.chain; |
| 4716 | lisp_free (mblk); |
| 4717 | n_marker_blocks--; |
| 4718 | } |
| 4719 | else |
| 4720 | { |
| 4721 | num_free += this_free; |
| 4722 | mprev = &mblk->next; |
| 4723 | } |
| 4724 | } |
| 4725 | |
| 4726 | total_markers = num_used; |
| 4727 | total_free_markers = num_free; |
| 4728 | } |
| 4729 | |
| 4730 | /* Free all unmarked buffers */ |
| 4731 | { |
| 4732 | register struct buffer *buffer = all_buffers, *prev = 0, *next; |
| 4733 | |
| 4734 | while (buffer) |
| 4735 | if (!XMARKBIT (buffer->name)) |
| 4736 | { |
| 4737 | if (prev) |
| 4738 | prev->next = buffer->next; |
| 4739 | else |
| 4740 | all_buffers = buffer->next; |
| 4741 | next = buffer->next; |
| 4742 | lisp_free (buffer); |
| 4743 | buffer = next; |
| 4744 | } |
| 4745 | else |
| 4746 | { |
| 4747 | XUNMARK (buffer->name); |
| 4748 | UNMARK_BALANCE_INTERVALS (BUF_INTERVALS (buffer)); |
| 4749 | prev = buffer, buffer = buffer->next; |
| 4750 | } |
| 4751 | } |
| 4752 | |
| 4753 | /* Free all unmarked vectors */ |
| 4754 | { |
| 4755 | register struct Lisp_Vector *vector = all_vectors, *prev = 0, *next; |
| 4756 | total_vector_size = 0; |
| 4757 | |
| 4758 | while (vector) |
| 4759 | if (!(vector->size & ARRAY_MARK_FLAG)) |
| 4760 | { |
| 4761 | if (prev) |
| 4762 | prev->next = vector->next; |
| 4763 | else |
| 4764 | all_vectors = vector->next; |
| 4765 | next = vector->next; |
| 4766 | lisp_free (vector); |
| 4767 | n_vectors--; |
| 4768 | vector = next; |
| 4769 | |
| 4770 | } |
| 4771 | else |
| 4772 | { |
| 4773 | vector->size &= ~ARRAY_MARK_FLAG; |
| 4774 | if (vector->size & PSEUDOVECTOR_FLAG) |
| 4775 | total_vector_size += (PSEUDOVECTOR_SIZE_MASK & vector->size); |
| 4776 | else |
| 4777 | total_vector_size += vector->size; |
| 4778 | prev = vector, vector = vector->next; |
| 4779 | } |
| 4780 | } |
| 4781 | } |
| 4782 | |
| 4783 | |
| 4784 | |
| 4785 | \f |
| 4786 | /* Debugging aids. */ |
| 4787 | |
| 4788 | DEFUN ("memory-limit", Fmemory_limit, Smemory_limit, 0, 0, 0, |
| 4789 | "Return the address of the last byte Emacs has allocated, divided by 1024.\n\ |
| 4790 | This may be helpful in debugging Emacs's memory usage.\n\ |
| 4791 | We divide the value by 1024 to make sure it fits in a Lisp integer.") |
| 4792 | () |
| 4793 | { |
| 4794 | Lisp_Object end; |
| 4795 | |
| 4796 | XSETINT (end, (EMACS_INT) sbrk (0) / 1024); |
| 4797 | |
| 4798 | return end; |
| 4799 | } |
| 4800 | |
| 4801 | DEFUN ("memory-use-counts", Fmemory_use_counts, Smemory_use_counts, 0, 0, 0, |
| 4802 | "Return a list of counters that measure how much consing there has been.\n\ |
| 4803 | Each of these counters increments for a certain kind of object.\n\ |
| 4804 | The counters wrap around from the largest positive integer to zero.\n\ |
| 4805 | Garbage collection does not decrease them.\n\ |
| 4806 | The elements of the value are as follows:\n\ |
| 4807 | (CONSES FLOATS VECTOR-CELLS SYMBOLS STRING-CHARS MISCS INTERVALS STRINGS)\n\ |
| 4808 | All are in units of 1 = one object consed\n\ |
| 4809 | except for VECTOR-CELLS and STRING-CHARS, which count the total length of\n\ |
| 4810 | objects consed.\n\ |
| 4811 | MISCS include overlays, markers, and some internal types.\n\ |
| 4812 | Frames, windows, buffers, and subprocesses count as vectors\n\ |
| 4813 | (but the contents of a buffer's text do not count here).") |
| 4814 | () |
| 4815 | { |
| 4816 | Lisp_Object consed[8]; |
| 4817 | |
| 4818 | XSETINT (consed[0], |
| 4819 | cons_cells_consed & ~(((EMACS_INT) 1) << (VALBITS - 1))); |
| 4820 | XSETINT (consed[1], |
| 4821 | floats_consed & ~(((EMACS_INT) 1) << (VALBITS - 1))); |
| 4822 | XSETINT (consed[2], |
| 4823 | vector_cells_consed & ~(((EMACS_INT) 1) << (VALBITS - 1))); |
| 4824 | XSETINT (consed[3], |
| 4825 | symbols_consed & ~(((EMACS_INT) 1) << (VALBITS - 1))); |
| 4826 | XSETINT (consed[4], |
| 4827 | string_chars_consed & ~(((EMACS_INT) 1) << (VALBITS - 1))); |
| 4828 | XSETINT (consed[5], |
| 4829 | misc_objects_consed & ~(((EMACS_INT) 1) << (VALBITS - 1))); |
| 4830 | XSETINT (consed[6], |
| 4831 | intervals_consed & ~(((EMACS_INT) 1) << (VALBITS - 1))); |
| 4832 | XSETINT (consed[7], |
| 4833 | strings_consed & ~(((EMACS_INT) 1) << (VALBITS - 1))); |
| 4834 | |
| 4835 | return Flist (8, consed); |
| 4836 | } |
| 4837 | |
| 4838 | int suppress_checking; |
| 4839 | void |
| 4840 | die (msg, file, line) |
| 4841 | const char *msg; |
| 4842 | const char *file; |
| 4843 | int line; |
| 4844 | { |
| 4845 | fprintf (stderr, "\r\nEmacs fatal error: %s:%d: %s\r\n", |
| 4846 | file, line, msg); |
| 4847 | abort (); |
| 4848 | } |
| 4849 | \f |
| 4850 | /* Initialization */ |
| 4851 | |
| 4852 | void |
| 4853 | init_alloc_once () |
| 4854 | { |
| 4855 | /* Used to do Vpurify_flag = Qt here, but Qt isn't set up yet! */ |
| 4856 | pureptr = 0; |
| 4857 | #if GC_MARK_STACK |
| 4858 | mem_init (); |
| 4859 | Vdead = make_pure_string ("DEAD", 4, 4, 0); |
| 4860 | #endif |
| 4861 | #ifdef HAVE_SHM |
| 4862 | pure_size = PURESIZE; |
| 4863 | #endif |
| 4864 | all_vectors = 0; |
| 4865 | ignore_warnings = 1; |
| 4866 | #ifdef DOUG_LEA_MALLOC |
| 4867 | mallopt (M_TRIM_THRESHOLD, 128*1024); /* trim threshold */ |
| 4868 | mallopt (M_MMAP_THRESHOLD, 64*1024); /* mmap threshold */ |
| 4869 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); /* max. number of mmap'ed areas */ |
| 4870 | #endif |
| 4871 | init_strings (); |
| 4872 | init_cons (); |
| 4873 | init_symbol (); |
| 4874 | init_marker (); |
| 4875 | init_float (); |
| 4876 | init_intervals (); |
| 4877 | |
| 4878 | #ifdef REL_ALLOC |
| 4879 | malloc_hysteresis = 32; |
| 4880 | #else |
| 4881 | malloc_hysteresis = 0; |
| 4882 | #endif |
| 4883 | |
| 4884 | spare_memory = (char *) malloc (SPARE_MEMORY); |
| 4885 | |
| 4886 | ignore_warnings = 0; |
| 4887 | gcprolist = 0; |
| 4888 | byte_stack_list = 0; |
| 4889 | staticidx = 0; |
| 4890 | consing_since_gc = 0; |
| 4891 | gc_cons_threshold = 100000 * sizeof (Lisp_Object); |
| 4892 | #ifdef VIRT_ADDR_VARIES |
| 4893 | malloc_sbrk_unused = 1<<22; /* A large number */ |
| 4894 | malloc_sbrk_used = 100000; /* as reasonable as any number */ |
| 4895 | #endif /* VIRT_ADDR_VARIES */ |
| 4896 | } |
| 4897 | |
| 4898 | void |
| 4899 | init_alloc () |
| 4900 | { |
| 4901 | gcprolist = 0; |
| 4902 | byte_stack_list = 0; |
| 4903 | #if GC_MARK_STACK |
| 4904 | #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS |
| 4905 | setjmp_tested_p = longjmps_done = 0; |
| 4906 | #endif |
| 4907 | #endif |
| 4908 | } |
| 4909 | |
| 4910 | void |
| 4911 | syms_of_alloc () |
| 4912 | { |
| 4913 | DEFVAR_INT ("gc-cons-threshold", &gc_cons_threshold, |
| 4914 | "*Number of bytes of consing between garbage collections.\n\ |
| 4915 | Garbage collection can happen automatically once this many bytes have been\n\ |
| 4916 | allocated since the last garbage collection. All data types count.\n\n\ |
| 4917 | Garbage collection happens automatically only when `eval' is called.\n\n\ |
| 4918 | By binding this temporarily to a large number, you can effectively\n\ |
| 4919 | prevent garbage collection during a part of the program."); |
| 4920 | |
| 4921 | DEFVAR_INT ("pure-bytes-used", &pureptr, |
| 4922 | "Number of bytes of sharable Lisp data allocated so far."); |
| 4923 | |
| 4924 | DEFVAR_INT ("cons-cells-consed", &cons_cells_consed, |
| 4925 | "Number of cons cells that have been consed so far."); |
| 4926 | |
| 4927 | DEFVAR_INT ("floats-consed", &floats_consed, |
| 4928 | "Number of floats that have been consed so far."); |
| 4929 | |
| 4930 | DEFVAR_INT ("vector-cells-consed", &vector_cells_consed, |
| 4931 | "Number of vector cells that have been consed so far."); |
| 4932 | |
| 4933 | DEFVAR_INT ("symbols-consed", &symbols_consed, |
| 4934 | "Number of symbols that have been consed so far."); |
| 4935 | |
| 4936 | DEFVAR_INT ("string-chars-consed", &string_chars_consed, |
| 4937 | "Number of string characters that have been consed so far."); |
| 4938 | |
| 4939 | DEFVAR_INT ("misc-objects-consed", &misc_objects_consed, |
| 4940 | "Number of miscellaneous objects that have been consed so far."); |
| 4941 | |
| 4942 | DEFVAR_INT ("intervals-consed", &intervals_consed, |
| 4943 | "Number of intervals that have been consed so far."); |
| 4944 | |
| 4945 | DEFVAR_INT ("strings-consed", &strings_consed, |
| 4946 | "Number of strings that have been consed so far."); |
| 4947 | |
| 4948 | DEFVAR_LISP ("purify-flag", &Vpurify_flag, |
| 4949 | "Non-nil means loading Lisp code in order to dump an executable.\n\ |
| 4950 | This means that certain objects should be allocated in shared (pure) space."); |
| 4951 | |
| 4952 | DEFVAR_INT ("undo-limit", &undo_limit, |
| 4953 | "Keep no more undo information once it exceeds this size.\n\ |
| 4954 | This limit is applied when garbage collection happens.\n\ |
| 4955 | The size is counted as the number of bytes occupied,\n\ |
| 4956 | which includes both saved text and other data."); |
| 4957 | undo_limit = 20000; |
| 4958 | |
| 4959 | DEFVAR_INT ("undo-strong-limit", &undo_strong_limit, |
| 4960 | "Don't keep more than this much size of undo information.\n\ |
| 4961 | A command which pushes past this size is itself forgotten.\n\ |
| 4962 | This limit is applied when garbage collection happens.\n\ |
| 4963 | The size is counted as the number of bytes occupied,\n\ |
| 4964 | which includes both saved text and other data."); |
| 4965 | undo_strong_limit = 30000; |
| 4966 | |
| 4967 | DEFVAR_BOOL ("garbage-collection-messages", &garbage_collection_messages, |
| 4968 | "Non-nil means display messages at start and end of garbage collection."); |
| 4969 | garbage_collection_messages = 0; |
| 4970 | |
| 4971 | /* We build this in advance because if we wait until we need it, we might |
| 4972 | not be able to allocate the memory to hold it. */ |
| 4973 | memory_signal_data |
| 4974 | = Fcons (Qerror, Fcons (build_string ("Memory exhausted--use M-x save-some-buffers RET"), Qnil)); |
| 4975 | staticpro (&memory_signal_data); |
| 4976 | |
| 4977 | staticpro (&Qgc_cons_threshold); |
| 4978 | Qgc_cons_threshold = intern ("gc-cons-threshold"); |
| 4979 | |
| 4980 | staticpro (&Qchar_table_extra_slots); |
| 4981 | Qchar_table_extra_slots = intern ("char-table-extra-slots"); |
| 4982 | |
| 4983 | defsubr (&Scons); |
| 4984 | defsubr (&Slist); |
| 4985 | defsubr (&Svector); |
| 4986 | defsubr (&Smake_byte_code); |
| 4987 | defsubr (&Smake_list); |
| 4988 | defsubr (&Smake_vector); |
| 4989 | defsubr (&Smake_char_table); |
| 4990 | defsubr (&Smake_string); |
| 4991 | defsubr (&Smake_bool_vector); |
| 4992 | defsubr (&Smake_symbol); |
| 4993 | defsubr (&Smake_marker); |
| 4994 | defsubr (&Spurecopy); |
| 4995 | defsubr (&Sgarbage_collect); |
| 4996 | defsubr (&Smemory_limit); |
| 4997 | defsubr (&Smemory_use_counts); |
| 4998 | |
| 4999 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
| 5000 | defsubr (&Sgc_status); |
| 5001 | #endif |
| 5002 | } |