Commit | Line | Data |
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7146af97 | 1 | /* Storage allocation and gc for GNU Emacs Lisp interpreter. |
999dd333 GM |
2 | |
3 | Copyright (C) 1985-1986, 1988, 1993-1995, 1997-2012 | |
4 | Free Software Foundation, Inc. | |
7146af97 JB |
5 | |
6 | This file is part of GNU Emacs. | |
7 | ||
9ec0b715 | 8 | GNU Emacs is free software: you can redistribute it and/or modify |
7146af97 | 9 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
10 | the Free Software Foundation, either version 3 of the License, or |
11 | (at your option) any later version. | |
7146af97 JB |
12 | |
13 | GNU Emacs is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 19 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
7146af97 | 20 | |
18160b98 | 21 | #include <config.h> |
e9b309ac | 22 | #include <stdio.h> |
ab6780cd | 23 | #include <limits.h> /* For CHAR_BIT. */ |
d7306fe6 | 24 | #include <setjmp.h> |
92939d31 | 25 | |
68c45bf0 | 26 | #include <signal.h> |
92939d31 | 27 | |
ae9e757a | 28 | #ifdef HAVE_PTHREAD |
aa477689 JD |
29 | #include <pthread.h> |
30 | #endif | |
31 | ||
7539e11f KR |
32 | /* This file is part of the core Lisp implementation, and thus must |
33 | deal with the real data structures. If the Lisp implementation is | |
34 | replaced, this file likely will not be used. */ | |
2e471eb5 | 35 | |
7539e11f | 36 | #undef HIDE_LISP_IMPLEMENTATION |
7146af97 | 37 | #include "lisp.h" |
ece93c02 | 38 | #include "process.h" |
d5e35230 | 39 | #include "intervals.h" |
4c0be5f4 | 40 | #include "puresize.h" |
e5560ff7 | 41 | #include "character.h" |
7146af97 JB |
42 | #include "buffer.h" |
43 | #include "window.h" | |
2538fae4 | 44 | #include "keyboard.h" |
502b9b64 | 45 | #include "frame.h" |
9ac0d9e0 | 46 | #include "blockinput.h" |
e065a56e | 47 | #include "syssignal.h" |
4a729fd8 | 48 | #include "termhooks.h" /* For struct terminal. */ |
34400008 | 49 | #include <setjmp.h> |
0065d054 | 50 | #include <verify.h> |
e065a56e | 51 | |
52828e02 PE |
52 | /* GC_CHECK_MARKED_OBJECTS means do sanity checks on allocated objects. |
53 | Doable only if GC_MARK_STACK. */ | |
54 | #if ! GC_MARK_STACK | |
55 | # undef GC_CHECK_MARKED_OBJECTS | |
56 | #endif | |
57 | ||
6b61353c | 58 | /* GC_MALLOC_CHECK defined means perform validity checks of malloc'd |
52828e02 PE |
59 | memory. Can do this only if using gmalloc.c and if not checking |
60 | marked objects. */ | |
6b61353c | 61 | |
52828e02 PE |
62 | #if (defined SYSTEM_MALLOC || defined DOUG_LEA_MALLOC \ |
63 | || defined GC_CHECK_MARKED_OBJECTS) | |
6b61353c KH |
64 | #undef GC_MALLOC_CHECK |
65 | #endif | |
66 | ||
bf952fb6 | 67 | #include <unistd.h> |
4004364e | 68 | #ifndef HAVE_UNISTD_H |
261cb4bb | 69 | extern void *sbrk (); |
bf952fb6 | 70 | #endif |
ee1eea5c | 71 | |
de7124a7 | 72 | #include <fcntl.h> |
de7124a7 | 73 | |
69666f77 | 74 | #ifdef WINDOWSNT |
f892cf9c | 75 | #include "w32.h" |
69666f77 EZ |
76 | #endif |
77 | ||
d1658221 | 78 | #ifdef DOUG_LEA_MALLOC |
2e471eb5 | 79 | |
d1658221 | 80 | #include <malloc.h> |
81d492d5 | 81 | |
2e471eb5 GM |
82 | /* Specify maximum number of areas to mmap. It would be nice to use a |
83 | value that explicitly means "no limit". */ | |
84 | ||
81d492d5 RS |
85 | #define MMAP_MAX_AREAS 100000000 |
86 | ||
2e471eb5 GM |
87 | #else /* not DOUG_LEA_MALLOC */ |
88 | ||
276cbe5a RS |
89 | /* The following come from gmalloc.c. */ |
90 | ||
5e927815 PE |
91 | extern size_t _bytes_used; |
92 | extern size_t __malloc_extra_blocks; | |
b62a57be PE |
93 | extern void *_malloc_internal (size_t); |
94 | extern void _free_internal (void *); | |
2e471eb5 GM |
95 | |
96 | #endif /* not DOUG_LEA_MALLOC */ | |
276cbe5a | 97 | |
7bc26fdb | 98 | #if ! defined SYSTEM_MALLOC && ! defined SYNC_INPUT |
ae9e757a | 99 | #ifdef HAVE_PTHREAD |
aa477689 | 100 | |
f415cacd JD |
101 | /* When GTK uses the file chooser dialog, different backends can be loaded |
102 | dynamically. One such a backend is the Gnome VFS backend that gets loaded | |
103 | if you run Gnome. That backend creates several threads and also allocates | |
104 | memory with malloc. | |
105 | ||
ae9e757a JD |
106 | Also, gconf and gsettings may create several threads. |
107 | ||
f415cacd JD |
108 | If Emacs sets malloc hooks (! SYSTEM_MALLOC) and the emacs_blocked_* |
109 | functions below are called from malloc, there is a chance that one | |
110 | of these threads preempts the Emacs main thread and the hook variables | |
333f1b6f | 111 | end up in an inconsistent state. So we have a mutex to prevent that (note |
f415cacd JD |
112 | that the backend handles concurrent access to malloc within its own threads |
113 | but Emacs code running in the main thread is not included in that control). | |
114 | ||
026cdede | 115 | When UNBLOCK_INPUT is called, reinvoke_input_signal may be called. If this |
f415cacd JD |
116 | happens in one of the backend threads we will have two threads that tries |
117 | to run Emacs code at once, and the code is not prepared for that. | |
118 | To prevent that, we only call BLOCK/UNBLOCK from the main thread. */ | |
119 | ||
aa477689 | 120 | static pthread_mutex_t alloc_mutex; |
aa477689 | 121 | |
959dc601 JD |
122 | #define BLOCK_INPUT_ALLOC \ |
123 | do \ | |
124 | { \ | |
125 | if (pthread_equal (pthread_self (), main_thread)) \ | |
86302e37 | 126 | BLOCK_INPUT; \ |
959dc601 JD |
127 | pthread_mutex_lock (&alloc_mutex); \ |
128 | } \ | |
aa477689 | 129 | while (0) |
959dc601 JD |
130 | #define UNBLOCK_INPUT_ALLOC \ |
131 | do \ | |
132 | { \ | |
133 | pthread_mutex_unlock (&alloc_mutex); \ | |
134 | if (pthread_equal (pthread_self (), main_thread)) \ | |
86302e37 | 135 | UNBLOCK_INPUT; \ |
959dc601 | 136 | } \ |
aa477689 JD |
137 | while (0) |
138 | ||
ae9e757a | 139 | #else /* ! defined HAVE_PTHREAD */ |
aa477689 JD |
140 | |
141 | #define BLOCK_INPUT_ALLOC BLOCK_INPUT | |
142 | #define UNBLOCK_INPUT_ALLOC UNBLOCK_INPUT | |
143 | ||
ae9e757a | 144 | #endif /* ! defined HAVE_PTHREAD */ |
7bc26fdb | 145 | #endif /* ! defined SYSTEM_MALLOC && ! defined SYNC_INPUT */ |
aa477689 | 146 | |
2e471eb5 GM |
147 | /* Mark, unmark, query mark bit of a Lisp string. S must be a pointer |
148 | to a struct Lisp_String. */ | |
149 | ||
7cdee936 SM |
150 | #define MARK_STRING(S) ((S)->size |= ARRAY_MARK_FLAG) |
151 | #define UNMARK_STRING(S) ((S)->size &= ~ARRAY_MARK_FLAG) | |
b059de99 | 152 | #define STRING_MARKED_P(S) (((S)->size & ARRAY_MARK_FLAG) != 0) |
2e471eb5 | 153 | |
eab3844f PE |
154 | #define VECTOR_MARK(V) ((V)->header.size |= ARRAY_MARK_FLAG) |
155 | #define VECTOR_UNMARK(V) ((V)->header.size &= ~ARRAY_MARK_FLAG) | |
156 | #define VECTOR_MARKED_P(V) (((V)->header.size & ARRAY_MARK_FLAG) != 0) | |
3ef06d12 | 157 | |
7bc26fdb PE |
158 | /* Value is the number of bytes of S, a pointer to a struct Lisp_String. |
159 | Be careful during GC, because S->size contains the mark bit for | |
2e471eb5 GM |
160 | strings. */ |
161 | ||
3ef06d12 | 162 | #define GC_STRING_BYTES(S) (STRING_BYTES (S)) |
2e471eb5 | 163 | |
29208e82 TT |
164 | /* Global variables. */ |
165 | struct emacs_globals globals; | |
166 | ||
2e471eb5 GM |
167 | /* Number of bytes of consing done since the last gc. */ |
168 | ||
0de4bb68 | 169 | EMACS_INT consing_since_gc; |
7146af97 | 170 | |
974aae61 RS |
171 | /* Similar minimum, computed from Vgc_cons_percentage. */ |
172 | ||
173 | EMACS_INT gc_relative_threshold; | |
310ea200 | 174 | |
24d8a105 RS |
175 | /* Minimum number of bytes of consing since GC before next GC, |
176 | when memory is full. */ | |
177 | ||
178 | EMACS_INT memory_full_cons_threshold; | |
179 | ||
2e471eb5 GM |
180 | /* Nonzero during GC. */ |
181 | ||
7146af97 JB |
182 | int gc_in_progress; |
183 | ||
3de0effb RS |
184 | /* Nonzero means abort if try to GC. |
185 | This is for code which is written on the assumption that | |
186 | no GC will happen, so as to verify that assumption. */ | |
187 | ||
188 | int abort_on_gc; | |
189 | ||
34400008 GM |
190 | /* Number of live and free conses etc. */ |
191 | ||
c0c5c8ae PE |
192 | static EMACS_INT total_conses, total_markers, total_symbols, total_vector_size; |
193 | static EMACS_INT total_free_conses, total_free_markers, total_free_symbols; | |
194 | static EMACS_INT total_free_floats, total_floats; | |
fd27a537 | 195 | |
2e471eb5 | 196 | /* Points to memory space allocated as "spare", to be freed if we run |
24d8a105 RS |
197 | out of memory. We keep one large block, four cons-blocks, and |
198 | two string blocks. */ | |
2e471eb5 | 199 | |
d3d47262 | 200 | static char *spare_memory[7]; |
276cbe5a | 201 | |
2b6148e4 PE |
202 | /* Amount of spare memory to keep in large reserve block, or to see |
203 | whether this much is available when malloc fails on a larger request. */ | |
2e471eb5 | 204 | |
276cbe5a | 205 | #define SPARE_MEMORY (1 << 14) |
4d09bcf6 | 206 | |
276cbe5a | 207 | /* Number of extra blocks malloc should get when it needs more core. */ |
2e471eb5 | 208 | |
276cbe5a RS |
209 | static int malloc_hysteresis; |
210 | ||
1b8950e5 RS |
211 | /* Initialize it to a nonzero value to force it into data space |
212 | (rather than bss space). That way unexec will remap it into text | |
213 | space (pure), on some systems. We have not implemented the | |
214 | remapping on more recent systems because this is less important | |
215 | nowadays than in the days of small memories and timesharing. */ | |
2e471eb5 | 216 | |
2c4685ee | 217 | EMACS_INT pure[(PURESIZE + sizeof (EMACS_INT) - 1) / sizeof (EMACS_INT)] = {1,}; |
7146af97 | 218 | #define PUREBEG (char *) pure |
2e471eb5 | 219 | |
9e713715 | 220 | /* Pointer to the pure area, and its size. */ |
2e471eb5 | 221 | |
9e713715 | 222 | static char *purebeg; |
903fe15d | 223 | static ptrdiff_t pure_size; |
9e713715 GM |
224 | |
225 | /* Number of bytes of pure storage used before pure storage overflowed. | |
226 | If this is non-zero, this implies that an overflow occurred. */ | |
227 | ||
903fe15d | 228 | static ptrdiff_t pure_bytes_used_before_overflow; |
7146af97 | 229 | |
34400008 GM |
230 | /* Value is non-zero if P points into pure space. */ |
231 | ||
232 | #define PURE_POINTER_P(P) \ | |
6a0bf43d | 233 | ((uintptr_t) (P) - (uintptr_t) purebeg <= pure_size) |
34400008 | 234 | |
e5bc14d4 YM |
235 | /* Index in pure at which next pure Lisp object will be allocated.. */ |
236 | ||
d311d28c | 237 | static ptrdiff_t pure_bytes_used_lisp; |
e5bc14d4 YM |
238 | |
239 | /* Number of bytes allocated for non-Lisp objects in pure storage. */ | |
240 | ||
d311d28c | 241 | static ptrdiff_t pure_bytes_used_non_lisp; |
e5bc14d4 | 242 | |
2e471eb5 GM |
243 | /* If nonzero, this is a warning delivered by malloc and not yet |
244 | displayed. */ | |
245 | ||
a8fe7202 | 246 | const char *pending_malloc_warning; |
7146af97 JB |
247 | |
248 | /* Maximum amount of C stack to save when a GC happens. */ | |
249 | ||
250 | #ifndef MAX_SAVE_STACK | |
251 | #define MAX_SAVE_STACK 16000 | |
252 | #endif | |
253 | ||
254 | /* Buffer in which we save a copy of the C stack at each GC. */ | |
255 | ||
dd3f25f7 | 256 | #if MAX_SAVE_STACK > 0 |
d3d47262 | 257 | static char *stack_copy; |
903fe15d | 258 | static ptrdiff_t stack_copy_size; |
dd3f25f7 | 259 | #endif |
7146af97 | 260 | |
2e471eb5 GM |
261 | /* Non-zero means ignore malloc warnings. Set during initialization. |
262 | Currently not used. */ | |
263 | ||
d3d47262 | 264 | static int ignore_warnings; |
350273a4 | 265 | |
955cbe7b PE |
266 | static Lisp_Object Qgc_cons_threshold; |
267 | Lisp_Object Qchar_table_extra_slots; | |
e8197642 | 268 | |
9e713715 GM |
269 | /* Hook run after GC has finished. */ |
270 | ||
955cbe7b | 271 | static Lisp_Object Qpost_gc_hook; |
2c5bd608 | 272 | |
f57e2426 J |
273 | static void mark_buffer (Lisp_Object); |
274 | static void mark_terminals (void); | |
f57e2426 | 275 | static void gc_sweep (void); |
72cb32cf | 276 | static Lisp_Object make_pure_vector (ptrdiff_t); |
f57e2426 J |
277 | static void mark_glyph_matrix (struct glyph_matrix *); |
278 | static void mark_face_cache (struct face_cache *); | |
41c28a37 | 279 | |
69003fd8 PE |
280 | #if !defined REL_ALLOC || defined SYSTEM_MALLOC |
281 | static void refill_memory_reserve (void); | |
282 | #endif | |
f57e2426 J |
283 | static struct Lisp_String *allocate_string (void); |
284 | static void compact_small_strings (void); | |
285 | static void free_large_strings (void); | |
286 | static void sweep_strings (void); | |
244ed907 | 287 | static void free_misc (Lisp_Object); |
196e41e4 | 288 | extern Lisp_Object which_symbols (Lisp_Object, EMACS_INT) EXTERNALLY_VISIBLE; |
34400008 | 289 | |
34400008 GM |
290 | /* When scanning the C stack for live Lisp objects, Emacs keeps track |
291 | of what memory allocated via lisp_malloc is intended for what | |
292 | purpose. This enumeration specifies the type of memory. */ | |
293 | ||
294 | enum mem_type | |
295 | { | |
296 | MEM_TYPE_NON_LISP, | |
297 | MEM_TYPE_BUFFER, | |
298 | MEM_TYPE_CONS, | |
299 | MEM_TYPE_STRING, | |
300 | MEM_TYPE_MISC, | |
301 | MEM_TYPE_SYMBOL, | |
302 | MEM_TYPE_FLOAT, | |
9c545a55 SM |
303 | /* We used to keep separate mem_types for subtypes of vectors such as |
304 | process, hash_table, frame, terminal, and window, but we never made | |
305 | use of the distinction, so it only caused source-code complexity | |
306 | and runtime slowdown. Minor but pointless. */ | |
f3372c87 DA |
307 | MEM_TYPE_VECTORLIKE, |
308 | /* Special type to denote vector blocks. */ | |
309 | MEM_TYPE_VECTOR_BLOCK | |
34400008 GM |
310 | }; |
311 | ||
261cb4bb | 312 | static void *lisp_malloc (size_t, enum mem_type); |
225ccad6 | 313 | |
24d8a105 | 314 | |
877935b1 | 315 | #if GC_MARK_STACK || defined GC_MALLOC_CHECK |
0b378936 GM |
316 | |
317 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES | |
318 | #include <stdio.h> /* For fprintf. */ | |
319 | #endif | |
320 | ||
321 | /* A unique object in pure space used to make some Lisp objects | |
322 | on free lists recognizable in O(1). */ | |
323 | ||
d3d47262 | 324 | static Lisp_Object Vdead; |
ca78dc43 | 325 | #define DEADP(x) EQ (x, Vdead) |
0b378936 | 326 | |
877935b1 GM |
327 | #ifdef GC_MALLOC_CHECK |
328 | ||
329 | enum mem_type allocated_mem_type; | |
877935b1 GM |
330 | |
331 | #endif /* GC_MALLOC_CHECK */ | |
332 | ||
333 | /* A node in the red-black tree describing allocated memory containing | |
334 | Lisp data. Each such block is recorded with its start and end | |
335 | address when it is allocated, and removed from the tree when it | |
336 | is freed. | |
337 | ||
338 | A red-black tree is a balanced binary tree with the following | |
339 | properties: | |
340 | ||
341 | 1. Every node is either red or black. | |
342 | 2. Every leaf is black. | |
343 | 3. If a node is red, then both of its children are black. | |
344 | 4. Every simple path from a node to a descendant leaf contains | |
345 | the same number of black nodes. | |
346 | 5. The root is always black. | |
347 | ||
348 | When nodes are inserted into the tree, or deleted from the tree, | |
349 | the tree is "fixed" so that these properties are always true. | |
350 | ||
351 | A red-black tree with N internal nodes has height at most 2 | |
352 | log(N+1). Searches, insertions and deletions are done in O(log N). | |
353 | Please see a text book about data structures for a detailed | |
354 | description of red-black trees. Any book worth its salt should | |
355 | describe them. */ | |
356 | ||
357 | struct mem_node | |
358 | { | |
9f7d9210 RS |
359 | /* Children of this node. These pointers are never NULL. When there |
360 | is no child, the value is MEM_NIL, which points to a dummy node. */ | |
361 | struct mem_node *left, *right; | |
362 | ||
363 | /* The parent of this node. In the root node, this is NULL. */ | |
364 | struct mem_node *parent; | |
877935b1 GM |
365 | |
366 | /* Start and end of allocated region. */ | |
367 | void *start, *end; | |
368 | ||
369 | /* Node color. */ | |
370 | enum {MEM_BLACK, MEM_RED} color; | |
177c0ea7 | 371 | |
877935b1 GM |
372 | /* Memory type. */ |
373 | enum mem_type type; | |
374 | }; | |
375 | ||
376 | /* Base address of stack. Set in main. */ | |
377 | ||
378 | Lisp_Object *stack_base; | |
379 | ||
380 | /* Root of the tree describing allocated Lisp memory. */ | |
381 | ||
382 | static struct mem_node *mem_root; | |
383 | ||
ece93c02 GM |
384 | /* Lowest and highest known address in the heap. */ |
385 | ||
386 | static void *min_heap_address, *max_heap_address; | |
387 | ||
877935b1 GM |
388 | /* Sentinel node of the tree. */ |
389 | ||
390 | static struct mem_node mem_z; | |
391 | #define MEM_NIL &mem_z | |
392 | ||
d311d28c | 393 | static struct Lisp_Vector *allocate_vectorlike (ptrdiff_t); |
261cb4bb | 394 | static void lisp_free (void *); |
f57e2426 J |
395 | static void mark_stack (void); |
396 | static int live_vector_p (struct mem_node *, void *); | |
397 | static int live_buffer_p (struct mem_node *, void *); | |
398 | static int live_string_p (struct mem_node *, void *); | |
399 | static int live_cons_p (struct mem_node *, void *); | |
400 | static int live_symbol_p (struct mem_node *, void *); | |
401 | static int live_float_p (struct mem_node *, void *); | |
402 | static int live_misc_p (struct mem_node *, void *); | |
403 | static void mark_maybe_object (Lisp_Object); | |
3164aeac | 404 | static void mark_memory (void *, void *); |
52828e02 | 405 | #if GC_MARK_STACK || defined GC_MALLOC_CHECK |
f57e2426 J |
406 | static void mem_init (void); |
407 | static struct mem_node *mem_insert (void *, void *, enum mem_type); | |
408 | static void mem_insert_fixup (struct mem_node *); | |
b62a57be | 409 | #endif |
f57e2426 J |
410 | static void mem_rotate_left (struct mem_node *); |
411 | static void mem_rotate_right (struct mem_node *); | |
412 | static void mem_delete (struct mem_node *); | |
413 | static void mem_delete_fixup (struct mem_node *); | |
55d4c1b2 | 414 | static inline struct mem_node *mem_find (void *); |
34400008 | 415 | |
34400008 GM |
416 | |
417 | #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS | |
f57e2426 | 418 | static void check_gcpros (void); |
34400008 GM |
419 | #endif |
420 | ||
877935b1 | 421 | #endif /* GC_MARK_STACK || GC_MALLOC_CHECK */ |
34400008 | 422 | |
ca78dc43 PE |
423 | #ifndef DEADP |
424 | # define DEADP(x) 0 | |
425 | #endif | |
426 | ||
1f0b3fd2 GM |
427 | /* Recording what needs to be marked for gc. */ |
428 | ||
429 | struct gcpro *gcprolist; | |
430 | ||
379b98b1 PE |
431 | /* Addresses of staticpro'd variables. Initialize it to a nonzero |
432 | value; otherwise some compilers put it into BSS. */ | |
1f0b3fd2 | 433 | |
d251c37c | 434 | #define NSTATICS 0x650 |
d3d47262 | 435 | static Lisp_Object *staticvec[NSTATICS] = {&Vpurify_flag}; |
1f0b3fd2 GM |
436 | |
437 | /* Index of next unused slot in staticvec. */ | |
438 | ||
d3d47262 | 439 | static int staticidx = 0; |
1f0b3fd2 | 440 | |
261cb4bb | 441 | static void *pure_alloc (size_t, int); |
1f0b3fd2 GM |
442 | |
443 | ||
444 | /* Value is SZ rounded up to the next multiple of ALIGNMENT. | |
445 | ALIGNMENT must be a power of 2. */ | |
446 | ||
ab6780cd | 447 | #define ALIGN(ptr, ALIGNMENT) \ |
261cb4bb PE |
448 | ((void *) (((uintptr_t) (ptr) + (ALIGNMENT) - 1) \ |
449 | & ~ ((ALIGNMENT) - 1))) | |
1f0b3fd2 | 450 | |
ece93c02 | 451 | |
7146af97 | 452 | \f |
34400008 GM |
453 | /************************************************************************ |
454 | Malloc | |
455 | ************************************************************************/ | |
456 | ||
4455ad75 | 457 | /* Function malloc calls this if it finds we are near exhausting storage. */ |
d457598b AS |
458 | |
459 | void | |
a8fe7202 | 460 | malloc_warning (const char *str) |
7146af97 JB |
461 | { |
462 | pending_malloc_warning = str; | |
463 | } | |
464 | ||
34400008 | 465 | |
4455ad75 | 466 | /* Display an already-pending malloc warning. */ |
34400008 | 467 | |
d457598b | 468 | void |
971de7fb | 469 | display_malloc_warning (void) |
7146af97 | 470 | { |
4455ad75 RS |
471 | call3 (intern ("display-warning"), |
472 | intern ("alloc"), | |
473 | build_string (pending_malloc_warning), | |
474 | intern ("emergency")); | |
7146af97 | 475 | pending_malloc_warning = 0; |
7146af97 | 476 | } |
49efed3a | 477 | \f |
276cbe5a RS |
478 | /* Called if we can't allocate relocatable space for a buffer. */ |
479 | ||
480 | void | |
d311d28c | 481 | buffer_memory_full (ptrdiff_t nbytes) |
276cbe5a | 482 | { |
2e471eb5 GM |
483 | /* If buffers use the relocating allocator, no need to free |
484 | spare_memory, because we may have plenty of malloc space left | |
485 | that we could get, and if we don't, the malloc that fails will | |
486 | itself cause spare_memory to be freed. If buffers don't use the | |
487 | relocating allocator, treat this like any other failing | |
488 | malloc. */ | |
276cbe5a RS |
489 | |
490 | #ifndef REL_ALLOC | |
531b0165 | 491 | memory_full (nbytes); |
276cbe5a RS |
492 | #endif |
493 | ||
2e471eb5 GM |
494 | /* This used to call error, but if we've run out of memory, we could |
495 | get infinite recursion trying to build the string. */ | |
9b306d37 | 496 | xsignal (Qnil, Vmemory_signal_data); |
7146af97 JB |
497 | } |
498 | ||
f3372c87 DA |
499 | /* A common multiple of the positive integers A and B. Ideally this |
500 | would be the least common multiple, but there's no way to do that | |
501 | as a constant expression in C, so do the best that we can easily do. */ | |
502 | #define COMMON_MULTIPLE(a, b) \ | |
503 | ((a) % (b) == 0 ? (a) : (b) % (a) == 0 ? (b) : (a) * (b)) | |
34400008 | 504 | |
c9d624c6 | 505 | #ifndef XMALLOC_OVERRUN_CHECK |
903fe15d | 506 | #define XMALLOC_OVERRUN_CHECK_OVERHEAD 0 |
c9d624c6 | 507 | #else |
212f33f1 | 508 | |
903fe15d PE |
509 | /* Check for overrun in malloc'ed buffers by wrapping a header and trailer |
510 | around each block. | |
bdbed949 | 511 | |
f701dc2a PE |
512 | The header consists of XMALLOC_OVERRUN_CHECK_SIZE fixed bytes |
513 | followed by XMALLOC_OVERRUN_SIZE_SIZE bytes containing the original | |
514 | block size in little-endian order. The trailer consists of | |
515 | XMALLOC_OVERRUN_CHECK_SIZE fixed bytes. | |
bdbed949 KS |
516 | |
517 | The header is used to detect whether this block has been allocated | |
f701dc2a PE |
518 | through these functions, as some low-level libc functions may |
519 | bypass the malloc hooks. */ | |
bdbed949 | 520 | |
212f33f1 | 521 | #define XMALLOC_OVERRUN_CHECK_SIZE 16 |
903fe15d | 522 | #define XMALLOC_OVERRUN_CHECK_OVERHEAD \ |
38532ce6 PE |
523 | (2 * XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE) |
524 | ||
525 | /* Define XMALLOC_OVERRUN_SIZE_SIZE so that (1) it's large enough to | |
f701dc2a PE |
526 | hold a size_t value and (2) the header size is a multiple of the |
527 | alignment that Emacs needs for C types and for USE_LSB_TAG. */ | |
528 | #define XMALLOC_BASE_ALIGNMENT \ | |
529 | offsetof ( \ | |
530 | struct { \ | |
531 | union { long double d; intmax_t i; void *p; } u; \ | |
532 | char c; \ | |
533 | }, \ | |
534 | c) | |
f3372c87 | 535 | |
bfe3e0a2 | 536 | #if USE_LSB_TAG |
f701dc2a PE |
537 | # define XMALLOC_HEADER_ALIGNMENT \ |
538 | COMMON_MULTIPLE (1 << GCTYPEBITS, XMALLOC_BASE_ALIGNMENT) | |
38532ce6 PE |
539 | #else |
540 | # define XMALLOC_HEADER_ALIGNMENT XMALLOC_BASE_ALIGNMENT | |
541 | #endif | |
542 | #define XMALLOC_OVERRUN_SIZE_SIZE \ | |
f701dc2a PE |
543 | (((XMALLOC_OVERRUN_CHECK_SIZE + sizeof (size_t) \ |
544 | + XMALLOC_HEADER_ALIGNMENT - 1) \ | |
545 | / XMALLOC_HEADER_ALIGNMENT * XMALLOC_HEADER_ALIGNMENT) \ | |
546 | - XMALLOC_OVERRUN_CHECK_SIZE) | |
bdbed949 | 547 | |
903fe15d PE |
548 | static char const xmalloc_overrun_check_header[XMALLOC_OVERRUN_CHECK_SIZE] = |
549 | { '\x9a', '\x9b', '\xae', '\xaf', | |
550 | '\xbf', '\xbe', '\xce', '\xcf', | |
551 | '\xea', '\xeb', '\xec', '\xed', | |
552 | '\xdf', '\xde', '\x9c', '\x9d' }; | |
212f33f1 | 553 | |
903fe15d PE |
554 | static char const xmalloc_overrun_check_trailer[XMALLOC_OVERRUN_CHECK_SIZE] = |
555 | { '\xaa', '\xab', '\xac', '\xad', | |
556 | '\xba', '\xbb', '\xbc', '\xbd', | |
557 | '\xca', '\xcb', '\xcc', '\xcd', | |
558 | '\xda', '\xdb', '\xdc', '\xdd' }; | |
212f33f1 | 559 | |
903fe15d | 560 | /* Insert and extract the block size in the header. */ |
bdbed949 | 561 | |
903fe15d PE |
562 | static void |
563 | xmalloc_put_size (unsigned char *ptr, size_t size) | |
564 | { | |
565 | int i; | |
38532ce6 | 566 | for (i = 0; i < XMALLOC_OVERRUN_SIZE_SIZE; i++) |
903fe15d | 567 | { |
38532ce6 | 568 | *--ptr = size & ((1 << CHAR_BIT) - 1); |
903fe15d PE |
569 | size >>= CHAR_BIT; |
570 | } | |
571 | } | |
bdbed949 | 572 | |
903fe15d PE |
573 | static size_t |
574 | xmalloc_get_size (unsigned char *ptr) | |
575 | { | |
576 | size_t size = 0; | |
577 | int i; | |
38532ce6 PE |
578 | ptr -= XMALLOC_OVERRUN_SIZE_SIZE; |
579 | for (i = 0; i < XMALLOC_OVERRUN_SIZE_SIZE; i++) | |
903fe15d PE |
580 | { |
581 | size <<= CHAR_BIT; | |
582 | size += *ptr++; | |
583 | } | |
584 | return size; | |
585 | } | |
bdbed949 KS |
586 | |
587 | ||
d8f165a8 JD |
588 | /* The call depth in overrun_check functions. For example, this might happen: |
589 | xmalloc() | |
590 | overrun_check_malloc() | |
591 | -> malloc -> (via hook)_-> emacs_blocked_malloc | |
592 | -> overrun_check_malloc | |
593 | call malloc (hooks are NULL, so real malloc is called). | |
594 | malloc returns 10000. | |
595 | add overhead, return 10016. | |
596 | <- (back in overrun_check_malloc) | |
857ae68b | 597 | add overhead again, return 10032 |
d8f165a8 | 598 | xmalloc returns 10032. |
857ae68b JD |
599 | |
600 | (time passes). | |
601 | ||
d8f165a8 JD |
602 | xfree(10032) |
603 | overrun_check_free(10032) | |
903fe15d | 604 | decrease overhead |
d8f165a8 | 605 | free(10016) <- crash, because 10000 is the original pointer. */ |
857ae68b | 606 | |
903fe15d | 607 | static ptrdiff_t check_depth; |
857ae68b | 608 | |
bdbed949 KS |
609 | /* Like malloc, but wraps allocated block with header and trailer. */ |
610 | ||
261cb4bb | 611 | static void * |
e7974947 | 612 | overrun_check_malloc (size_t size) |
212f33f1 | 613 | { |
bdbed949 | 614 | register unsigned char *val; |
903fe15d PE |
615 | int overhead = ++check_depth == 1 ? XMALLOC_OVERRUN_CHECK_OVERHEAD : 0; |
616 | if (SIZE_MAX - overhead < size) | |
617 | abort (); | |
212f33f1 | 618 | |
857ae68b JD |
619 | val = (unsigned char *) malloc (size + overhead); |
620 | if (val && check_depth == 1) | |
212f33f1 | 621 | { |
903fe15d | 622 | memcpy (val, xmalloc_overrun_check_header, XMALLOC_OVERRUN_CHECK_SIZE); |
38532ce6 | 623 | val += XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
903fe15d | 624 | xmalloc_put_size (val, size); |
72af86bd AS |
625 | memcpy (val + size, xmalloc_overrun_check_trailer, |
626 | XMALLOC_OVERRUN_CHECK_SIZE); | |
212f33f1 | 627 | } |
857ae68b | 628 | --check_depth; |
261cb4bb | 629 | return val; |
212f33f1 KS |
630 | } |
631 | ||
bdbed949 KS |
632 | |
633 | /* Like realloc, but checks old block for overrun, and wraps new block | |
634 | with header and trailer. */ | |
635 | ||
261cb4bb PE |
636 | static void * |
637 | overrun_check_realloc (void *block, size_t size) | |
212f33f1 | 638 | { |
e7974947 | 639 | register unsigned char *val = (unsigned char *) block; |
903fe15d PE |
640 | int overhead = ++check_depth == 1 ? XMALLOC_OVERRUN_CHECK_OVERHEAD : 0; |
641 | if (SIZE_MAX - overhead < size) | |
642 | abort (); | |
212f33f1 KS |
643 | |
644 | if (val | |
857ae68b | 645 | && check_depth == 1 |
72af86bd | 646 | && memcmp (xmalloc_overrun_check_header, |
38532ce6 | 647 | val - XMALLOC_OVERRUN_CHECK_SIZE - XMALLOC_OVERRUN_SIZE_SIZE, |
903fe15d | 648 | XMALLOC_OVERRUN_CHECK_SIZE) == 0) |
212f33f1 | 649 | { |
903fe15d | 650 | size_t osize = xmalloc_get_size (val); |
72af86bd AS |
651 | if (memcmp (xmalloc_overrun_check_trailer, val + osize, |
652 | XMALLOC_OVERRUN_CHECK_SIZE)) | |
212f33f1 | 653 | abort (); |
72af86bd | 654 | memset (val + osize, 0, XMALLOC_OVERRUN_CHECK_SIZE); |
38532ce6 PE |
655 | val -= XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
656 | memset (val, 0, XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE); | |
212f33f1 KS |
657 | } |
658 | ||
261cb4bb | 659 | val = realloc (val, size + overhead); |
212f33f1 | 660 | |
857ae68b | 661 | if (val && check_depth == 1) |
212f33f1 | 662 | { |
903fe15d | 663 | memcpy (val, xmalloc_overrun_check_header, XMALLOC_OVERRUN_CHECK_SIZE); |
38532ce6 | 664 | val += XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
903fe15d | 665 | xmalloc_put_size (val, size); |
72af86bd AS |
666 | memcpy (val + size, xmalloc_overrun_check_trailer, |
667 | XMALLOC_OVERRUN_CHECK_SIZE); | |
212f33f1 | 668 | } |
857ae68b | 669 | --check_depth; |
261cb4bb | 670 | return val; |
212f33f1 KS |
671 | } |
672 | ||
bdbed949 KS |
673 | /* Like free, but checks block for overrun. */ |
674 | ||
2538aa2f | 675 | static void |
261cb4bb | 676 | overrun_check_free (void *block) |
212f33f1 | 677 | { |
e7974947 | 678 | unsigned char *val = (unsigned char *) block; |
212f33f1 | 679 | |
857ae68b | 680 | ++check_depth; |
212f33f1 | 681 | if (val |
857ae68b | 682 | && check_depth == 1 |
72af86bd | 683 | && memcmp (xmalloc_overrun_check_header, |
38532ce6 | 684 | val - XMALLOC_OVERRUN_CHECK_SIZE - XMALLOC_OVERRUN_SIZE_SIZE, |
903fe15d | 685 | XMALLOC_OVERRUN_CHECK_SIZE) == 0) |
212f33f1 | 686 | { |
903fe15d | 687 | size_t osize = xmalloc_get_size (val); |
72af86bd AS |
688 | if (memcmp (xmalloc_overrun_check_trailer, val + osize, |
689 | XMALLOC_OVERRUN_CHECK_SIZE)) | |
212f33f1 | 690 | abort (); |
454d7973 | 691 | #ifdef XMALLOC_CLEAR_FREE_MEMORY |
38532ce6 | 692 | val -= XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
903fe15d | 693 | memset (val, 0xff, osize + XMALLOC_OVERRUN_CHECK_OVERHEAD); |
454d7973 | 694 | #else |
72af86bd | 695 | memset (val + osize, 0, XMALLOC_OVERRUN_CHECK_SIZE); |
38532ce6 PE |
696 | val -= XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
697 | memset (val, 0, XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE); | |
454d7973 | 698 | #endif |
212f33f1 KS |
699 | } |
700 | ||
701 | free (val); | |
857ae68b | 702 | --check_depth; |
212f33f1 KS |
703 | } |
704 | ||
705 | #undef malloc | |
706 | #undef realloc | |
707 | #undef free | |
708 | #define malloc overrun_check_malloc | |
709 | #define realloc overrun_check_realloc | |
710 | #define free overrun_check_free | |
711 | #endif | |
712 | ||
dafc79fa SM |
713 | #ifdef SYNC_INPUT |
714 | /* When using SYNC_INPUT, we don't call malloc from a signal handler, so | |
715 | there's no need to block input around malloc. */ | |
716 | #define MALLOC_BLOCK_INPUT ((void)0) | |
717 | #define MALLOC_UNBLOCK_INPUT ((void)0) | |
718 | #else | |
719 | #define MALLOC_BLOCK_INPUT BLOCK_INPUT | |
720 | #define MALLOC_UNBLOCK_INPUT UNBLOCK_INPUT | |
721 | #endif | |
bdbed949 | 722 | |
34400008 | 723 | /* Like malloc but check for no memory and block interrupt input.. */ |
7146af97 | 724 | |
261cb4bb | 725 | void * |
971de7fb | 726 | xmalloc (size_t size) |
7146af97 | 727 | { |
261cb4bb | 728 | void *val; |
7146af97 | 729 | |
dafc79fa | 730 | MALLOC_BLOCK_INPUT; |
261cb4bb | 731 | val = malloc (size); |
dafc79fa | 732 | MALLOC_UNBLOCK_INPUT; |
7146af97 | 733 | |
2e471eb5 | 734 | if (!val && size) |
531b0165 | 735 | memory_full (size); |
7146af97 JB |
736 | return val; |
737 | } | |
738 | ||
34400008 GM |
739 | |
740 | /* Like realloc but check for no memory and block interrupt input.. */ | |
741 | ||
261cb4bb PE |
742 | void * |
743 | xrealloc (void *block, size_t size) | |
7146af97 | 744 | { |
261cb4bb | 745 | void *val; |
7146af97 | 746 | |
dafc79fa | 747 | MALLOC_BLOCK_INPUT; |
56d2031b JB |
748 | /* We must call malloc explicitly when BLOCK is 0, since some |
749 | reallocs don't do this. */ | |
750 | if (! block) | |
261cb4bb | 751 | val = malloc (size); |
f048679d | 752 | else |
261cb4bb | 753 | val = realloc (block, size); |
dafc79fa | 754 | MALLOC_UNBLOCK_INPUT; |
7146af97 | 755 | |
531b0165 PE |
756 | if (!val && size) |
757 | memory_full (size); | |
7146af97 JB |
758 | return val; |
759 | } | |
9ac0d9e0 | 760 | |
34400008 | 761 | |
005ca5c7 | 762 | /* Like free but block interrupt input. */ |
34400008 | 763 | |
9ac0d9e0 | 764 | void |
261cb4bb | 765 | xfree (void *block) |
9ac0d9e0 | 766 | { |
70fdbb46 JM |
767 | if (!block) |
768 | return; | |
dafc79fa | 769 | MALLOC_BLOCK_INPUT; |
9ac0d9e0 | 770 | free (block); |
dafc79fa | 771 | MALLOC_UNBLOCK_INPUT; |
24d8a105 RS |
772 | /* We don't call refill_memory_reserve here |
773 | because that duplicates doing so in emacs_blocked_free | |
774 | and the criterion should go there. */ | |
9ac0d9e0 JB |
775 | } |
776 | ||
c8099634 | 777 | |
0065d054 PE |
778 | /* Other parts of Emacs pass large int values to allocator functions |
779 | expecting ptrdiff_t. This is portable in practice, but check it to | |
780 | be safe. */ | |
781 | verify (INT_MAX <= PTRDIFF_MAX); | |
782 | ||
783 | ||
784 | /* Allocate an array of NITEMS items, each of size ITEM_SIZE. | |
785 | Signal an error on memory exhaustion, and block interrupt input. */ | |
786 | ||
787 | void * | |
788 | xnmalloc (ptrdiff_t nitems, ptrdiff_t item_size) | |
789 | { | |
790 | xassert (0 <= nitems && 0 < item_size); | |
791 | if (min (PTRDIFF_MAX, SIZE_MAX) / item_size < nitems) | |
792 | memory_full (SIZE_MAX); | |
793 | return xmalloc (nitems * item_size); | |
794 | } | |
795 | ||
796 | ||
797 | /* Reallocate an array PA to make it of NITEMS items, each of size ITEM_SIZE. | |
798 | Signal an error on memory exhaustion, and block interrupt input. */ | |
799 | ||
800 | void * | |
801 | xnrealloc (void *pa, ptrdiff_t nitems, ptrdiff_t item_size) | |
802 | { | |
803 | xassert (0 <= nitems && 0 < item_size); | |
804 | if (min (PTRDIFF_MAX, SIZE_MAX) / item_size < nitems) | |
805 | memory_full (SIZE_MAX); | |
806 | return xrealloc (pa, nitems * item_size); | |
807 | } | |
808 | ||
809 | ||
810 | /* Grow PA, which points to an array of *NITEMS items, and return the | |
811 | location of the reallocated array, updating *NITEMS to reflect its | |
812 | new size. The new array will contain at least NITEMS_INCR_MIN more | |
813 | items, but will not contain more than NITEMS_MAX items total. | |
814 | ITEM_SIZE is the size of each item, in bytes. | |
815 | ||
816 | ITEM_SIZE and NITEMS_INCR_MIN must be positive. *NITEMS must be | |
817 | nonnegative. If NITEMS_MAX is -1, it is treated as if it were | |
818 | infinity. | |
819 | ||
820 | If PA is null, then allocate a new array instead of reallocating | |
821 | the old one. Thus, to grow an array A without saving its old | |
822 | contents, invoke xfree (A) immediately followed by xgrowalloc (0, | |
823 | &NITEMS, ...). | |
824 | ||
825 | Block interrupt input as needed. If memory exhaustion occurs, set | |
826 | *NITEMS to zero if PA is null, and signal an error (i.e., do not | |
827 | return). */ | |
828 | ||
829 | void * | |
830 | xpalloc (void *pa, ptrdiff_t *nitems, ptrdiff_t nitems_incr_min, | |
831 | ptrdiff_t nitems_max, ptrdiff_t item_size) | |
832 | { | |
833 | /* The approximate size to use for initial small allocation | |
834 | requests. This is the largest "small" request for the GNU C | |
835 | library malloc. */ | |
836 | enum { DEFAULT_MXFAST = 64 * sizeof (size_t) / 4 }; | |
837 | ||
838 | /* If the array is tiny, grow it to about (but no greater than) | |
839 | DEFAULT_MXFAST bytes. Otherwise, grow it by about 50%. */ | |
840 | ptrdiff_t n = *nitems; | |
841 | ptrdiff_t tiny_max = DEFAULT_MXFAST / item_size - n; | |
842 | ptrdiff_t half_again = n >> 1; | |
843 | ptrdiff_t incr_estimate = max (tiny_max, half_again); | |
844 | ||
845 | /* Adjust the increment according to three constraints: NITEMS_INCR_MIN, | |
846 | NITEMS_MAX, and what the C language can represent safely. */ | |
847 | ptrdiff_t C_language_max = min (PTRDIFF_MAX, SIZE_MAX) / item_size; | |
848 | ptrdiff_t n_max = (0 <= nitems_max && nitems_max < C_language_max | |
849 | ? nitems_max : C_language_max); | |
850 | ptrdiff_t nitems_incr_max = n_max - n; | |
851 | ptrdiff_t incr = max (nitems_incr_min, min (incr_estimate, nitems_incr_max)); | |
852 | ||
853 | xassert (0 < item_size && 0 < nitems_incr_min && 0 <= n && -1 <= nitems_max); | |
854 | if (! pa) | |
855 | *nitems = 0; | |
856 | if (nitems_incr_max < incr) | |
857 | memory_full (SIZE_MAX); | |
858 | n += incr; | |
859 | pa = xrealloc (pa, n * item_size); | |
860 | *nitems = n; | |
861 | return pa; | |
862 | } | |
863 | ||
864 | ||
dca7c6a8 GM |
865 | /* Like strdup, but uses xmalloc. */ |
866 | ||
867 | char * | |
971de7fb | 868 | xstrdup (const char *s) |
dca7c6a8 | 869 | { |
675d5130 | 870 | size_t len = strlen (s) + 1; |
dca7c6a8 | 871 | char *p = (char *) xmalloc (len); |
72af86bd | 872 | memcpy (p, s, len); |
dca7c6a8 GM |
873 | return p; |
874 | } | |
875 | ||
876 | ||
f61bef8b KS |
877 | /* Unwind for SAFE_ALLOCA */ |
878 | ||
879 | Lisp_Object | |
971de7fb | 880 | safe_alloca_unwind (Lisp_Object arg) |
f61bef8b | 881 | { |
b766f870 KS |
882 | register struct Lisp_Save_Value *p = XSAVE_VALUE (arg); |
883 | ||
884 | p->dogc = 0; | |
885 | xfree (p->pointer); | |
886 | p->pointer = 0; | |
7b7990cc | 887 | free_misc (arg); |
f61bef8b KS |
888 | return Qnil; |
889 | } | |
890 | ||
891 | ||
34400008 GM |
892 | /* Like malloc but used for allocating Lisp data. NBYTES is the |
893 | number of bytes to allocate, TYPE describes the intended use of the | |
91af3942 | 894 | allocated memory block (for strings, for conses, ...). */ |
34400008 | 895 | |
bfe3e0a2 PE |
896 | #if ! USE_LSB_TAG |
897 | void *lisp_malloc_loser EXTERNALLY_VISIBLE; | |
212f33f1 | 898 | #endif |
918a23a7 | 899 | |
261cb4bb | 900 | static void * |
971de7fb | 901 | lisp_malloc (size_t nbytes, enum mem_type type) |
c8099634 | 902 | { |
34400008 | 903 | register void *val; |
c8099634 | 904 | |
dafc79fa | 905 | MALLOC_BLOCK_INPUT; |
877935b1 GM |
906 | |
907 | #ifdef GC_MALLOC_CHECK | |
908 | allocated_mem_type = type; | |
909 | #endif | |
177c0ea7 | 910 | |
34400008 | 911 | val = (void *) malloc (nbytes); |
c8099634 | 912 | |
bfe3e0a2 | 913 | #if ! USE_LSB_TAG |
918a23a7 RS |
914 | /* If the memory just allocated cannot be addressed thru a Lisp |
915 | object's pointer, and it needs to be, | |
916 | that's equivalent to running out of memory. */ | |
917 | if (val && type != MEM_TYPE_NON_LISP) | |
918 | { | |
919 | Lisp_Object tem; | |
920 | XSETCONS (tem, (char *) val + nbytes - 1); | |
921 | if ((char *) XCONS (tem) != (char *) val + nbytes - 1) | |
922 | { | |
923 | lisp_malloc_loser = val; | |
924 | free (val); | |
925 | val = 0; | |
926 | } | |
927 | } | |
6b61353c | 928 | #endif |
918a23a7 | 929 | |
877935b1 | 930 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK |
dca7c6a8 | 931 | if (val && type != MEM_TYPE_NON_LISP) |
34400008 GM |
932 | mem_insert (val, (char *) val + nbytes, type); |
933 | #endif | |
177c0ea7 | 934 | |
dafc79fa | 935 | MALLOC_UNBLOCK_INPUT; |
dca7c6a8 | 936 | if (!val && nbytes) |
531b0165 | 937 | memory_full (nbytes); |
c8099634 RS |
938 | return val; |
939 | } | |
940 | ||
34400008 GM |
941 | /* Free BLOCK. This must be called to free memory allocated with a |
942 | call to lisp_malloc. */ | |
943 | ||
bf952fb6 | 944 | static void |
261cb4bb | 945 | lisp_free (void *block) |
c8099634 | 946 | { |
dafc79fa | 947 | MALLOC_BLOCK_INPUT; |
c8099634 | 948 | free (block); |
877935b1 | 949 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK |
34400008 GM |
950 | mem_delete (mem_find (block)); |
951 | #endif | |
dafc79fa | 952 | MALLOC_UNBLOCK_INPUT; |
c8099634 | 953 | } |
34400008 | 954 | |
453b951e SM |
955 | /***** Allocation of aligned blocks of memory to store Lisp data. *****/ |
956 | ||
957 | /* The entry point is lisp_align_malloc which returns blocks of at most | |
958 | BLOCK_BYTES and guarantees they are aligned on a BLOCK_ALIGN boundary. */ | |
ab6780cd | 959 | |
b4181b01 KS |
960 | #if defined (HAVE_POSIX_MEMALIGN) && defined (SYSTEM_MALLOC) |
961 | #define USE_POSIX_MEMALIGN 1 | |
962 | #endif | |
ab6780cd SM |
963 | |
964 | /* BLOCK_ALIGN has to be a power of 2. */ | |
965 | #define BLOCK_ALIGN (1 << 10) | |
ab6780cd SM |
966 | |
967 | /* Padding to leave at the end of a malloc'd block. This is to give | |
968 | malloc a chance to minimize the amount of memory wasted to alignment. | |
969 | It should be tuned to the particular malloc library used. | |
19bcad1f SM |
970 | On glibc-2.3.2, malloc never tries to align, so a padding of 0 is best. |
971 | posix_memalign on the other hand would ideally prefer a value of 4 | |
972 | because otherwise, there's 1020 bytes wasted between each ablocks. | |
f501ccb4 SM |
973 | In Emacs, testing shows that those 1020 can most of the time be |
974 | efficiently used by malloc to place other objects, so a value of 0 can | |
975 | still preferable unless you have a lot of aligned blocks and virtually | |
976 | nothing else. */ | |
19bcad1f SM |
977 | #define BLOCK_PADDING 0 |
978 | #define BLOCK_BYTES \ | |
0b432f21 | 979 | (BLOCK_ALIGN - sizeof (struct ablocks *) - BLOCK_PADDING) |
19bcad1f SM |
980 | |
981 | /* Internal data structures and constants. */ | |
982 | ||
ab6780cd SM |
983 | #define ABLOCKS_SIZE 16 |
984 | ||
985 | /* An aligned block of memory. */ | |
986 | struct ablock | |
987 | { | |
988 | union | |
989 | { | |
990 | char payload[BLOCK_BYTES]; | |
991 | struct ablock *next_free; | |
992 | } x; | |
993 | /* `abase' is the aligned base of the ablocks. */ | |
994 | /* It is overloaded to hold the virtual `busy' field that counts | |
995 | the number of used ablock in the parent ablocks. | |
996 | The first ablock has the `busy' field, the others have the `abase' | |
997 | field. To tell the difference, we assume that pointers will have | |
998 | integer values larger than 2 * ABLOCKS_SIZE. The lowest bit of `busy' | |
999 | is used to tell whether the real base of the parent ablocks is `abase' | |
1000 | (if not, the word before the first ablock holds a pointer to the | |
1001 | real base). */ | |
1002 | struct ablocks *abase; | |
1003 | /* The padding of all but the last ablock is unused. The padding of | |
1004 | the last ablock in an ablocks is not allocated. */ | |
19bcad1f SM |
1005 | #if BLOCK_PADDING |
1006 | char padding[BLOCK_PADDING]; | |
ebb8d410 | 1007 | #endif |
ab6780cd SM |
1008 | }; |
1009 | ||
1010 | /* A bunch of consecutive aligned blocks. */ | |
1011 | struct ablocks | |
1012 | { | |
1013 | struct ablock blocks[ABLOCKS_SIZE]; | |
1014 | }; | |
1015 | ||
4b5afbb0 | 1016 | /* Size of the block requested from malloc or posix_memalign. */ |
19bcad1f | 1017 | #define ABLOCKS_BYTES (sizeof (struct ablocks) - BLOCK_PADDING) |
ab6780cd SM |
1018 | |
1019 | #define ABLOCK_ABASE(block) \ | |
d01a7826 | 1020 | (((uintptr_t) (block)->abase) <= (1 + 2 * ABLOCKS_SIZE) \ |
ab6780cd SM |
1021 | ? (struct ablocks *)(block) \ |
1022 | : (block)->abase) | |
1023 | ||
1024 | /* Virtual `busy' field. */ | |
1025 | #define ABLOCKS_BUSY(abase) ((abase)->blocks[0].abase) | |
1026 | ||
1027 | /* Pointer to the (not necessarily aligned) malloc block. */ | |
349a4500 | 1028 | #ifdef USE_POSIX_MEMALIGN |
19bcad1f SM |
1029 | #define ABLOCKS_BASE(abase) (abase) |
1030 | #else | |
ab6780cd | 1031 | #define ABLOCKS_BASE(abase) \ |
d01a7826 | 1032 | (1 & (intptr_t) ABLOCKS_BUSY (abase) ? abase : ((void**)abase)[-1]) |
19bcad1f | 1033 | #endif |
ab6780cd SM |
1034 | |
1035 | /* The list of free ablock. */ | |
1036 | static struct ablock *free_ablock; | |
1037 | ||
1038 | /* Allocate an aligned block of nbytes. | |
1039 | Alignment is on a multiple of BLOCK_ALIGN and `nbytes' has to be | |
1040 | smaller or equal to BLOCK_BYTES. */ | |
261cb4bb | 1041 | static void * |
971de7fb | 1042 | lisp_align_malloc (size_t nbytes, enum mem_type type) |
ab6780cd SM |
1043 | { |
1044 | void *base, *val; | |
1045 | struct ablocks *abase; | |
1046 | ||
1047 | eassert (nbytes <= BLOCK_BYTES); | |
1048 | ||
dafc79fa | 1049 | MALLOC_BLOCK_INPUT; |
ab6780cd SM |
1050 | |
1051 | #ifdef GC_MALLOC_CHECK | |
1052 | allocated_mem_type = type; | |
1053 | #endif | |
1054 | ||
1055 | if (!free_ablock) | |
1056 | { | |
005ca5c7 | 1057 | int i; |
d01a7826 | 1058 | intptr_t aligned; /* int gets warning casting to 64-bit pointer. */ |
ab6780cd SM |
1059 | |
1060 | #ifdef DOUG_LEA_MALLOC | |
1061 | /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed | |
1062 | because mapped region contents are not preserved in | |
1063 | a dumped Emacs. */ | |
1064 | mallopt (M_MMAP_MAX, 0); | |
1065 | #endif | |
1066 | ||
349a4500 | 1067 | #ifdef USE_POSIX_MEMALIGN |
19bcad1f SM |
1068 | { |
1069 | int err = posix_memalign (&base, BLOCK_ALIGN, ABLOCKS_BYTES); | |
ab349c19 RS |
1070 | if (err) |
1071 | base = NULL; | |
1072 | abase = base; | |
19bcad1f SM |
1073 | } |
1074 | #else | |
ab6780cd SM |
1075 | base = malloc (ABLOCKS_BYTES); |
1076 | abase = ALIGN (base, BLOCK_ALIGN); | |
ab349c19 RS |
1077 | #endif |
1078 | ||
6b61353c KH |
1079 | if (base == 0) |
1080 | { | |
dafc79fa | 1081 | MALLOC_UNBLOCK_INPUT; |
531b0165 | 1082 | memory_full (ABLOCKS_BYTES); |
6b61353c | 1083 | } |
ab6780cd SM |
1084 | |
1085 | aligned = (base == abase); | |
1086 | if (!aligned) | |
1087 | ((void**)abase)[-1] = base; | |
1088 | ||
1089 | #ifdef DOUG_LEA_MALLOC | |
1090 | /* Back to a reasonable maximum of mmap'ed areas. */ | |
1091 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); | |
1092 | #endif | |
1093 | ||
bfe3e0a2 | 1094 | #if ! USE_LSB_TAG |
8f924df7 KH |
1095 | /* If the memory just allocated cannot be addressed thru a Lisp |
1096 | object's pointer, and it needs to be, that's equivalent to | |
1097 | running out of memory. */ | |
1098 | if (type != MEM_TYPE_NON_LISP) | |
1099 | { | |
1100 | Lisp_Object tem; | |
1101 | char *end = (char *) base + ABLOCKS_BYTES - 1; | |
1102 | XSETCONS (tem, end); | |
1103 | if ((char *) XCONS (tem) != end) | |
1104 | { | |
1105 | lisp_malloc_loser = base; | |
1106 | free (base); | |
dafc79fa | 1107 | MALLOC_UNBLOCK_INPUT; |
531b0165 | 1108 | memory_full (SIZE_MAX); |
8f924df7 KH |
1109 | } |
1110 | } | |
6b61353c | 1111 | #endif |
8f924df7 | 1112 | |
ab6780cd | 1113 | /* Initialize the blocks and put them on the free list. |
453b951e | 1114 | If `base' was not properly aligned, we can't use the last block. */ |
ab6780cd SM |
1115 | for (i = 0; i < (aligned ? ABLOCKS_SIZE : ABLOCKS_SIZE - 1); i++) |
1116 | { | |
1117 | abase->blocks[i].abase = abase; | |
1118 | abase->blocks[i].x.next_free = free_ablock; | |
1119 | free_ablock = &abase->blocks[i]; | |
1120 | } | |
8ac068ac | 1121 | ABLOCKS_BUSY (abase) = (struct ablocks *) aligned; |
ab6780cd | 1122 | |
d01a7826 | 1123 | eassert (0 == ((uintptr_t) abase) % BLOCK_ALIGN); |
ab6780cd SM |
1124 | eassert (ABLOCK_ABASE (&abase->blocks[3]) == abase); /* 3 is arbitrary */ |
1125 | eassert (ABLOCK_ABASE (&abase->blocks[0]) == abase); | |
1126 | eassert (ABLOCKS_BASE (abase) == base); | |
d01a7826 | 1127 | eassert (aligned == (intptr_t) ABLOCKS_BUSY (abase)); |
ab6780cd SM |
1128 | } |
1129 | ||
1130 | abase = ABLOCK_ABASE (free_ablock); | |
8ac068ac | 1131 | ABLOCKS_BUSY (abase) = |
d01a7826 | 1132 | (struct ablocks *) (2 + (intptr_t) ABLOCKS_BUSY (abase)); |
ab6780cd SM |
1133 | val = free_ablock; |
1134 | free_ablock = free_ablock->x.next_free; | |
1135 | ||
ab6780cd | 1136 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK |
3687c2ef | 1137 | if (type != MEM_TYPE_NON_LISP) |
ab6780cd SM |
1138 | mem_insert (val, (char *) val + nbytes, type); |
1139 | #endif | |
1140 | ||
dafc79fa | 1141 | MALLOC_UNBLOCK_INPUT; |
ab6780cd | 1142 | |
d01a7826 | 1143 | eassert (0 == ((uintptr_t) val) % BLOCK_ALIGN); |
ab6780cd SM |
1144 | return val; |
1145 | } | |
1146 | ||
1147 | static void | |
261cb4bb | 1148 | lisp_align_free (void *block) |
ab6780cd SM |
1149 | { |
1150 | struct ablock *ablock = block; | |
1151 | struct ablocks *abase = ABLOCK_ABASE (ablock); | |
1152 | ||
dafc79fa | 1153 | MALLOC_BLOCK_INPUT; |
ab6780cd SM |
1154 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK |
1155 | mem_delete (mem_find (block)); | |
1156 | #endif | |
1157 | /* Put on free list. */ | |
1158 | ablock->x.next_free = free_ablock; | |
1159 | free_ablock = ablock; | |
1160 | /* Update busy count. */ | |
453b951e SM |
1161 | ABLOCKS_BUSY (abase) |
1162 | = (struct ablocks *) (-2 + (intptr_t) ABLOCKS_BUSY (abase)); | |
d2db1c32 | 1163 | |
d01a7826 | 1164 | if (2 > (intptr_t) ABLOCKS_BUSY (abase)) |
ab6780cd | 1165 | { /* All the blocks are free. */ |
d01a7826 | 1166 | int i = 0, aligned = (intptr_t) ABLOCKS_BUSY (abase); |
ab6780cd SM |
1167 | struct ablock **tem = &free_ablock; |
1168 | struct ablock *atop = &abase->blocks[aligned ? ABLOCKS_SIZE : ABLOCKS_SIZE - 1]; | |
1169 | ||
1170 | while (*tem) | |
1171 | { | |
1172 | if (*tem >= (struct ablock *) abase && *tem < atop) | |
1173 | { | |
1174 | i++; | |
1175 | *tem = (*tem)->x.next_free; | |
1176 | } | |
1177 | else | |
1178 | tem = &(*tem)->x.next_free; | |
1179 | } | |
1180 | eassert ((aligned & 1) == aligned); | |
1181 | eassert (i == (aligned ? ABLOCKS_SIZE : ABLOCKS_SIZE - 1)); | |
349a4500 | 1182 | #ifdef USE_POSIX_MEMALIGN |
d01a7826 | 1183 | eassert ((uintptr_t) ABLOCKS_BASE (abase) % BLOCK_ALIGN == 0); |
cfb2f32e | 1184 | #endif |
ab6780cd SM |
1185 | free (ABLOCKS_BASE (abase)); |
1186 | } | |
dafc79fa | 1187 | MALLOC_UNBLOCK_INPUT; |
ab6780cd | 1188 | } |
3ef06d12 SM |
1189 | |
1190 | /* Return a new buffer structure allocated from the heap with | |
1191 | a call to lisp_malloc. */ | |
1192 | ||
1193 | struct buffer * | |
971de7fb | 1194 | allocate_buffer (void) |
3ef06d12 SM |
1195 | { |
1196 | struct buffer *b | |
1197 | = (struct buffer *) lisp_malloc (sizeof (struct buffer), | |
1198 | MEM_TYPE_BUFFER); | |
eab3844f PE |
1199 | XSETPVECTYPESIZE (b, PVEC_BUFFER, |
1200 | ((sizeof (struct buffer) + sizeof (EMACS_INT) - 1) | |
1201 | / sizeof (EMACS_INT))); | |
3ef06d12 SM |
1202 | return b; |
1203 | } | |
1204 | ||
9ac0d9e0 | 1205 | \f |
026cdede SM |
1206 | #ifndef SYSTEM_MALLOC |
1207 | ||
9ac0d9e0 JB |
1208 | /* Arranging to disable input signals while we're in malloc. |
1209 | ||
1210 | This only works with GNU malloc. To help out systems which can't | |
1211 | use GNU malloc, all the calls to malloc, realloc, and free | |
1212 | elsewhere in the code should be inside a BLOCK_INPUT/UNBLOCK_INPUT | |
026cdede | 1213 | pair; unfortunately, we have no idea what C library functions |
9ac0d9e0 | 1214 | might call malloc, so we can't really protect them unless you're |
2c5bd608 DL |
1215 | using GNU malloc. Fortunately, most of the major operating systems |
1216 | can use GNU malloc. */ | |
9ac0d9e0 | 1217 | |
026cdede | 1218 | #ifndef SYNC_INPUT |
dafc79fa SM |
1219 | /* When using SYNC_INPUT, we don't call malloc from a signal handler, so |
1220 | there's no need to block input around malloc. */ | |
026cdede | 1221 | |
b3303f74 | 1222 | #ifndef DOUG_LEA_MALLOC |
f57e2426 J |
1223 | extern void * (*__malloc_hook) (size_t, const void *); |
1224 | extern void * (*__realloc_hook) (void *, size_t, const void *); | |
1225 | extern void (*__free_hook) (void *, const void *); | |
b3303f74 DL |
1226 | /* Else declared in malloc.h, perhaps with an extra arg. */ |
1227 | #endif /* DOUG_LEA_MALLOC */ | |
f57e2426 J |
1228 | static void * (*old_malloc_hook) (size_t, const void *); |
1229 | static void * (*old_realloc_hook) (void *, size_t, const void*); | |
1230 | static void (*old_free_hook) (void*, const void*); | |
9ac0d9e0 | 1231 | |
4e75f29d PE |
1232 | #ifdef DOUG_LEA_MALLOC |
1233 | # define BYTES_USED (mallinfo ().uordblks) | |
1234 | #else | |
1235 | # define BYTES_USED _bytes_used | |
1236 | #endif | |
1237 | ||
b62a57be PE |
1238 | #ifdef GC_MALLOC_CHECK |
1239 | static int dont_register_blocks; | |
1240 | #endif | |
1241 | ||
5e927815 | 1242 | static size_t bytes_used_when_reconsidered; |
ef1b0ba7 | 1243 | |
4e75f29d PE |
1244 | /* Value of _bytes_used, when spare_memory was freed. */ |
1245 | ||
5e927815 | 1246 | static size_t bytes_used_when_full; |
4e75f29d | 1247 | |
276cbe5a RS |
1248 | /* This function is used as the hook for free to call. */ |
1249 | ||
9ac0d9e0 | 1250 | static void |
7c3320d8 | 1251 | emacs_blocked_free (void *ptr, const void *ptr2) |
9ac0d9e0 | 1252 | { |
aa477689 | 1253 | BLOCK_INPUT_ALLOC; |
877935b1 GM |
1254 | |
1255 | #ifdef GC_MALLOC_CHECK | |
a83fee2c GM |
1256 | if (ptr) |
1257 | { | |
1258 | struct mem_node *m; | |
177c0ea7 | 1259 | |
a83fee2c GM |
1260 | m = mem_find (ptr); |
1261 | if (m == MEM_NIL || m->start != ptr) | |
1262 | { | |
1263 | fprintf (stderr, | |
1264 | "Freeing `%p' which wasn't allocated with malloc\n", ptr); | |
1265 | abort (); | |
1266 | } | |
1267 | else | |
1268 | { | |
1269 | /* fprintf (stderr, "free %p...%p (%p)\n", m->start, m->end, ptr); */ | |
1270 | mem_delete (m); | |
1271 | } | |
1272 | } | |
877935b1 | 1273 | #endif /* GC_MALLOC_CHECK */ |
177c0ea7 | 1274 | |
9ac0d9e0 JB |
1275 | __free_hook = old_free_hook; |
1276 | free (ptr); | |
177c0ea7 | 1277 | |
276cbe5a RS |
1278 | /* If we released our reserve (due to running out of memory), |
1279 | and we have a fair amount free once again, | |
1280 | try to set aside another reserve in case we run out once more. */ | |
24d8a105 | 1281 | if (! NILP (Vmemory_full) |
276cbe5a RS |
1282 | /* Verify there is enough space that even with the malloc |
1283 | hysteresis this call won't run out again. | |
1284 | The code here is correct as long as SPARE_MEMORY | |
1285 | is substantially larger than the block size malloc uses. */ | |
1286 | && (bytes_used_when_full | |
4d74a5fc | 1287 | > ((bytes_used_when_reconsidered = BYTES_USED) |
bccfb310 | 1288 | + max (malloc_hysteresis, 4) * SPARE_MEMORY))) |
24d8a105 | 1289 | refill_memory_reserve (); |
276cbe5a | 1290 | |
b0846f52 | 1291 | __free_hook = emacs_blocked_free; |
aa477689 | 1292 | UNBLOCK_INPUT_ALLOC; |
9ac0d9e0 JB |
1293 | } |
1294 | ||
34400008 | 1295 | |
276cbe5a RS |
1296 | /* This function is the malloc hook that Emacs uses. */ |
1297 | ||
9ac0d9e0 | 1298 | static void * |
7c3320d8 | 1299 | emacs_blocked_malloc (size_t size, const void *ptr) |
9ac0d9e0 JB |
1300 | { |
1301 | void *value; | |
1302 | ||
aa477689 | 1303 | BLOCK_INPUT_ALLOC; |
9ac0d9e0 | 1304 | __malloc_hook = old_malloc_hook; |
1177ecf6 | 1305 | #ifdef DOUG_LEA_MALLOC |
5665a02f KL |
1306 | /* Segfaults on my system. --lorentey */ |
1307 | /* mallopt (M_TOP_PAD, malloc_hysteresis * 4096); */ | |
1177ecf6 | 1308 | #else |
d1658221 | 1309 | __malloc_extra_blocks = malloc_hysteresis; |
1177ecf6 | 1310 | #endif |
877935b1 | 1311 | |
2756d8ee | 1312 | value = (void *) malloc (size); |
877935b1 GM |
1313 | |
1314 | #ifdef GC_MALLOC_CHECK | |
1315 | { | |
1316 | struct mem_node *m = mem_find (value); | |
1317 | if (m != MEM_NIL) | |
1318 | { | |
1319 | fprintf (stderr, "Malloc returned %p which is already in use\n", | |
1320 | value); | |
da05bc4c | 1321 | fprintf (stderr, "Region in use is %p...%p, %td bytes, type %d\n", |
877935b1 GM |
1322 | m->start, m->end, (char *) m->end - (char *) m->start, |
1323 | m->type); | |
1324 | abort (); | |
1325 | } | |
1326 | ||
1327 | if (!dont_register_blocks) | |
1328 | { | |
1329 | mem_insert (value, (char *) value + max (1, size), allocated_mem_type); | |
1330 | allocated_mem_type = MEM_TYPE_NON_LISP; | |
1331 | } | |
1332 | } | |
1333 | #endif /* GC_MALLOC_CHECK */ | |
177c0ea7 | 1334 | |
b0846f52 | 1335 | __malloc_hook = emacs_blocked_malloc; |
aa477689 | 1336 | UNBLOCK_INPUT_ALLOC; |
9ac0d9e0 | 1337 | |
877935b1 | 1338 | /* fprintf (stderr, "%p malloc\n", value); */ |
9ac0d9e0 JB |
1339 | return value; |
1340 | } | |
1341 | ||
34400008 GM |
1342 | |
1343 | /* This function is the realloc hook that Emacs uses. */ | |
1344 | ||
9ac0d9e0 | 1345 | static void * |
7c3320d8 | 1346 | emacs_blocked_realloc (void *ptr, size_t size, const void *ptr2) |
9ac0d9e0 JB |
1347 | { |
1348 | void *value; | |
1349 | ||
aa477689 | 1350 | BLOCK_INPUT_ALLOC; |
9ac0d9e0 | 1351 | __realloc_hook = old_realloc_hook; |
877935b1 GM |
1352 | |
1353 | #ifdef GC_MALLOC_CHECK | |
1354 | if (ptr) | |
1355 | { | |
1356 | struct mem_node *m = mem_find (ptr); | |
1357 | if (m == MEM_NIL || m->start != ptr) | |
1358 | { | |
1359 | fprintf (stderr, | |
1360 | "Realloc of %p which wasn't allocated with malloc\n", | |
1361 | ptr); | |
1362 | abort (); | |
1363 | } | |
1364 | ||
1365 | mem_delete (m); | |
1366 | } | |
177c0ea7 | 1367 | |
877935b1 | 1368 | /* fprintf (stderr, "%p -> realloc\n", ptr); */ |
177c0ea7 | 1369 | |
877935b1 GM |
1370 | /* Prevent malloc from registering blocks. */ |
1371 | dont_register_blocks = 1; | |
1372 | #endif /* GC_MALLOC_CHECK */ | |
1373 | ||
2756d8ee | 1374 | value = (void *) realloc (ptr, size); |
877935b1 GM |
1375 | |
1376 | #ifdef GC_MALLOC_CHECK | |
1377 | dont_register_blocks = 0; | |
1378 | ||
1379 | { | |
1380 | struct mem_node *m = mem_find (value); | |
1381 | if (m != MEM_NIL) | |
1382 | { | |
1383 | fprintf (stderr, "Realloc returns memory that is already in use\n"); | |
1384 | abort (); | |
1385 | } | |
1386 | ||
1387 | /* Can't handle zero size regions in the red-black tree. */ | |
1388 | mem_insert (value, (char *) value + max (size, 1), MEM_TYPE_NON_LISP); | |
1389 | } | |
177c0ea7 | 1390 | |
877935b1 GM |
1391 | /* fprintf (stderr, "%p <- realloc\n", value); */ |
1392 | #endif /* GC_MALLOC_CHECK */ | |
177c0ea7 | 1393 | |
b0846f52 | 1394 | __realloc_hook = emacs_blocked_realloc; |
aa477689 | 1395 | UNBLOCK_INPUT_ALLOC; |
9ac0d9e0 JB |
1396 | |
1397 | return value; | |
1398 | } | |
1399 | ||
34400008 | 1400 | |
ae9e757a | 1401 | #ifdef HAVE_PTHREAD |
aa477689 JD |
1402 | /* Called from Fdump_emacs so that when the dumped Emacs starts, it has a |
1403 | normal malloc. Some thread implementations need this as they call | |
1404 | malloc before main. The pthread_self call in BLOCK_INPUT_ALLOC then | |
1405 | calls malloc because it is the first call, and we have an endless loop. */ | |
1406 | ||
1407 | void | |
268c2c36 | 1408 | reset_malloc_hooks (void) |
aa477689 | 1409 | { |
4d580af2 AS |
1410 | __free_hook = old_free_hook; |
1411 | __malloc_hook = old_malloc_hook; | |
1412 | __realloc_hook = old_realloc_hook; | |
aa477689 | 1413 | } |
ae9e757a | 1414 | #endif /* HAVE_PTHREAD */ |
aa477689 JD |
1415 | |
1416 | ||
34400008 GM |
1417 | /* Called from main to set up malloc to use our hooks. */ |
1418 | ||
9ac0d9e0 | 1419 | void |
7c3320d8 | 1420 | uninterrupt_malloc (void) |
9ac0d9e0 | 1421 | { |
ae9e757a | 1422 | #ifdef HAVE_PTHREAD |
a1b41389 | 1423 | #ifdef DOUG_LEA_MALLOC |
aa477689 JD |
1424 | pthread_mutexattr_t attr; |
1425 | ||
c7015153 | 1426 | /* GLIBC has a faster way to do this, but let's keep it portable. |
aa477689 JD |
1427 | This is according to the Single UNIX Specification. */ |
1428 | pthread_mutexattr_init (&attr); | |
1429 | pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE); | |
1430 | pthread_mutex_init (&alloc_mutex, &attr); | |
a1b41389 | 1431 | #else /* !DOUG_LEA_MALLOC */ |
ce5b453a | 1432 | /* Some systems such as Solaris 2.6 don't have a recursive mutex, |
a1b41389 YM |
1433 | and the bundled gmalloc.c doesn't require it. */ |
1434 | pthread_mutex_init (&alloc_mutex, NULL); | |
1435 | #endif /* !DOUG_LEA_MALLOC */ | |
ae9e757a | 1436 | #endif /* HAVE_PTHREAD */ |
aa477689 | 1437 | |
c8099634 RS |
1438 | if (__free_hook != emacs_blocked_free) |
1439 | old_free_hook = __free_hook; | |
b0846f52 | 1440 | __free_hook = emacs_blocked_free; |
9ac0d9e0 | 1441 | |
c8099634 RS |
1442 | if (__malloc_hook != emacs_blocked_malloc) |
1443 | old_malloc_hook = __malloc_hook; | |
b0846f52 | 1444 | __malloc_hook = emacs_blocked_malloc; |
9ac0d9e0 | 1445 | |
c8099634 RS |
1446 | if (__realloc_hook != emacs_blocked_realloc) |
1447 | old_realloc_hook = __realloc_hook; | |
b0846f52 | 1448 | __realloc_hook = emacs_blocked_realloc; |
9ac0d9e0 | 1449 | } |
2e471eb5 | 1450 | |
026cdede | 1451 | #endif /* not SYNC_INPUT */ |
2e471eb5 GM |
1452 | #endif /* not SYSTEM_MALLOC */ |
1453 | ||
1454 | ||
7146af97 | 1455 | \f |
2e471eb5 GM |
1456 | /*********************************************************************** |
1457 | Interval Allocation | |
1458 | ***********************************************************************/ | |
1a4f1e2c | 1459 | |
34400008 GM |
1460 | /* Number of intervals allocated in an interval_block structure. |
1461 | The 1020 is 1024 minus malloc overhead. */ | |
1462 | ||
d5e35230 JA |
1463 | #define INTERVAL_BLOCK_SIZE \ |
1464 | ((1020 - sizeof (struct interval_block *)) / sizeof (struct interval)) | |
1465 | ||
34400008 GM |
1466 | /* Intervals are allocated in chunks in form of an interval_block |
1467 | structure. */ | |
1468 | ||
d5e35230 | 1469 | struct interval_block |
2e471eb5 | 1470 | { |
6b61353c | 1471 | /* Place `intervals' first, to preserve alignment. */ |
2e471eb5 | 1472 | struct interval intervals[INTERVAL_BLOCK_SIZE]; |
6b61353c | 1473 | struct interval_block *next; |
2e471eb5 | 1474 | }; |
d5e35230 | 1475 | |
34400008 GM |
1476 | /* Current interval block. Its `next' pointer points to older |
1477 | blocks. */ | |
1478 | ||
d3d47262 | 1479 | static struct interval_block *interval_block; |
34400008 GM |
1480 | |
1481 | /* Index in interval_block above of the next unused interval | |
1482 | structure. */ | |
1483 | ||
d5e35230 | 1484 | static int interval_block_index; |
34400008 GM |
1485 | |
1486 | /* Number of free and live intervals. */ | |
1487 | ||
c0c5c8ae | 1488 | static EMACS_INT total_free_intervals, total_intervals; |
d5e35230 | 1489 | |
34400008 GM |
1490 | /* List of free intervals. */ |
1491 | ||
244ed907 | 1492 | static INTERVAL interval_free_list; |
d5e35230 | 1493 | |
34400008 GM |
1494 | |
1495 | /* Initialize interval allocation. */ | |
1496 | ||
d5e35230 | 1497 | static void |
971de7fb | 1498 | init_intervals (void) |
d5e35230 | 1499 | { |
005ca5c7 DL |
1500 | interval_block = NULL; |
1501 | interval_block_index = INTERVAL_BLOCK_SIZE; | |
d5e35230 JA |
1502 | interval_free_list = 0; |
1503 | } | |
1504 | ||
34400008 GM |
1505 | |
1506 | /* Return a new interval. */ | |
d5e35230 JA |
1507 | |
1508 | INTERVAL | |
971de7fb | 1509 | make_interval (void) |
d5e35230 JA |
1510 | { |
1511 | INTERVAL val; | |
1512 | ||
e2984df0 CY |
1513 | /* eassert (!handling_signal); */ |
1514 | ||
dafc79fa | 1515 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 1516 | |
d5e35230 JA |
1517 | if (interval_free_list) |
1518 | { | |
1519 | val = interval_free_list; | |
439d5cb4 | 1520 | interval_free_list = INTERVAL_PARENT (interval_free_list); |
d5e35230 JA |
1521 | } |
1522 | else | |
1523 | { | |
1524 | if (interval_block_index == INTERVAL_BLOCK_SIZE) | |
1525 | { | |
3c06d205 KH |
1526 | register struct interval_block *newi; |
1527 | ||
34400008 GM |
1528 | newi = (struct interval_block *) lisp_malloc (sizeof *newi, |
1529 | MEM_TYPE_NON_LISP); | |
d5e35230 | 1530 | |
d5e35230 JA |
1531 | newi->next = interval_block; |
1532 | interval_block = newi; | |
1533 | interval_block_index = 0; | |
1534 | } | |
1535 | val = &interval_block->intervals[interval_block_index++]; | |
1536 | } | |
e2984df0 | 1537 | |
dafc79fa | 1538 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 1539 | |
d5e35230 | 1540 | consing_since_gc += sizeof (struct interval); |
310ea200 | 1541 | intervals_consed++; |
d5e35230 | 1542 | RESET_INTERVAL (val); |
2336fe58 | 1543 | val->gcmarkbit = 0; |
d5e35230 JA |
1544 | return val; |
1545 | } | |
1546 | ||
34400008 GM |
1547 | |
1548 | /* Mark Lisp objects in interval I. */ | |
d5e35230 JA |
1549 | |
1550 | static void | |
971de7fb | 1551 | mark_interval (register INTERVAL i, Lisp_Object dummy) |
d5e35230 | 1552 | { |
2336fe58 SM |
1553 | eassert (!i->gcmarkbit); /* Intervals are never shared. */ |
1554 | i->gcmarkbit = 1; | |
49723c04 | 1555 | mark_object (i->plist); |
d5e35230 JA |
1556 | } |
1557 | ||
34400008 GM |
1558 | |
1559 | /* Mark the interval tree rooted in TREE. Don't call this directly; | |
1560 | use the macro MARK_INTERVAL_TREE instead. */ | |
1561 | ||
d5e35230 | 1562 | static void |
971de7fb | 1563 | mark_interval_tree (register INTERVAL tree) |
d5e35230 | 1564 | { |
e8720644 JB |
1565 | /* No need to test if this tree has been marked already; this |
1566 | function is always called through the MARK_INTERVAL_TREE macro, | |
1567 | which takes care of that. */ | |
1568 | ||
1e934989 | 1569 | traverse_intervals_noorder (tree, mark_interval, Qnil); |
d5e35230 JA |
1570 | } |
1571 | ||
34400008 GM |
1572 | |
1573 | /* Mark the interval tree rooted in I. */ | |
1574 | ||
e8720644 JB |
1575 | #define MARK_INTERVAL_TREE(i) \ |
1576 | do { \ | |
2336fe58 | 1577 | if (!NULL_INTERVAL_P (i) && !i->gcmarkbit) \ |
e8720644 JB |
1578 | mark_interval_tree (i); \ |
1579 | } while (0) | |
d5e35230 | 1580 | |
34400008 | 1581 | |
2e471eb5 GM |
1582 | #define UNMARK_BALANCE_INTERVALS(i) \ |
1583 | do { \ | |
1584 | if (! NULL_INTERVAL_P (i)) \ | |
2336fe58 | 1585 | (i) = balance_intervals (i); \ |
2e471eb5 | 1586 | } while (0) |
d5e35230 | 1587 | \f |
2e471eb5 GM |
1588 | /*********************************************************************** |
1589 | String Allocation | |
1590 | ***********************************************************************/ | |
1a4f1e2c | 1591 | |
2e471eb5 GM |
1592 | /* Lisp_Strings are allocated in string_block structures. When a new |
1593 | string_block is allocated, all the Lisp_Strings it contains are | |
e0fead5d | 1594 | added to a free-list string_free_list. When a new Lisp_String is |
2e471eb5 GM |
1595 | needed, it is taken from that list. During the sweep phase of GC, |
1596 | string_blocks that are entirely free are freed, except two which | |
1597 | we keep. | |
7146af97 | 1598 | |
2e471eb5 GM |
1599 | String data is allocated from sblock structures. Strings larger |
1600 | than LARGE_STRING_BYTES, get their own sblock, data for smaller | |
1601 | strings is sub-allocated out of sblocks of size SBLOCK_SIZE. | |
7146af97 | 1602 | |
2e471eb5 GM |
1603 | Sblocks consist internally of sdata structures, one for each |
1604 | Lisp_String. The sdata structure points to the Lisp_String it | |
1605 | belongs to. The Lisp_String points back to the `u.data' member of | |
1606 | its sdata structure. | |
7146af97 | 1607 | |
2e471eb5 GM |
1608 | When a Lisp_String is freed during GC, it is put back on |
1609 | string_free_list, and its `data' member and its sdata's `string' | |
1610 | pointer is set to null. The size of the string is recorded in the | |
1611 | `u.nbytes' member of the sdata. So, sdata structures that are no | |
1612 | longer used, can be easily recognized, and it's easy to compact the | |
1613 | sblocks of small strings which we do in compact_small_strings. */ | |
7146af97 | 1614 | |
2e471eb5 GM |
1615 | /* Size in bytes of an sblock structure used for small strings. This |
1616 | is 8192 minus malloc overhead. */ | |
7146af97 | 1617 | |
2e471eb5 | 1618 | #define SBLOCK_SIZE 8188 |
c8099634 | 1619 | |
2e471eb5 GM |
1620 | /* Strings larger than this are considered large strings. String data |
1621 | for large strings is allocated from individual sblocks. */ | |
7146af97 | 1622 | |
2e471eb5 GM |
1623 | #define LARGE_STRING_BYTES 1024 |
1624 | ||
1625 | /* Structure describing string memory sub-allocated from an sblock. | |
1626 | This is where the contents of Lisp strings are stored. */ | |
1627 | ||
1628 | struct sdata | |
7146af97 | 1629 | { |
2e471eb5 GM |
1630 | /* Back-pointer to the string this sdata belongs to. If null, this |
1631 | structure is free, and the NBYTES member of the union below | |
34400008 | 1632 | contains the string's byte size (the same value that STRING_BYTES |
2e471eb5 GM |
1633 | would return if STRING were non-null). If non-null, STRING_BYTES |
1634 | (STRING) is the size of the data, and DATA contains the string's | |
1635 | contents. */ | |
1636 | struct Lisp_String *string; | |
7146af97 | 1637 | |
31d929e5 | 1638 | #ifdef GC_CHECK_STRING_BYTES |
177c0ea7 | 1639 | |
d311d28c | 1640 | ptrdiff_t nbytes; |
31d929e5 | 1641 | unsigned char data[1]; |
177c0ea7 | 1642 | |
31d929e5 GM |
1643 | #define SDATA_NBYTES(S) (S)->nbytes |
1644 | #define SDATA_DATA(S) (S)->data | |
36372bf9 | 1645 | #define SDATA_SELECTOR(member) member |
177c0ea7 | 1646 | |
31d929e5 GM |
1647 | #else /* not GC_CHECK_STRING_BYTES */ |
1648 | ||
2e471eb5 GM |
1649 | union |
1650 | { | |
83998b7a | 1651 | /* When STRING is non-null. */ |
2e471eb5 GM |
1652 | unsigned char data[1]; |
1653 | ||
1654 | /* When STRING is null. */ | |
d311d28c | 1655 | ptrdiff_t nbytes; |
2e471eb5 | 1656 | } u; |
177c0ea7 | 1657 | |
31d929e5 GM |
1658 | #define SDATA_NBYTES(S) (S)->u.nbytes |
1659 | #define SDATA_DATA(S) (S)->u.data | |
36372bf9 | 1660 | #define SDATA_SELECTOR(member) u.member |
31d929e5 GM |
1661 | |
1662 | #endif /* not GC_CHECK_STRING_BYTES */ | |
36372bf9 PE |
1663 | |
1664 | #define SDATA_DATA_OFFSET offsetof (struct sdata, SDATA_SELECTOR (data)) | |
2e471eb5 GM |
1665 | }; |
1666 | ||
31d929e5 | 1667 | |
2e471eb5 GM |
1668 | /* Structure describing a block of memory which is sub-allocated to |
1669 | obtain string data memory for strings. Blocks for small strings | |
1670 | are of fixed size SBLOCK_SIZE. Blocks for large strings are made | |
1671 | as large as needed. */ | |
1672 | ||
1673 | struct sblock | |
7146af97 | 1674 | { |
2e471eb5 GM |
1675 | /* Next in list. */ |
1676 | struct sblock *next; | |
7146af97 | 1677 | |
2e471eb5 GM |
1678 | /* Pointer to the next free sdata block. This points past the end |
1679 | of the sblock if there isn't any space left in this block. */ | |
1680 | struct sdata *next_free; | |
1681 | ||
1682 | /* Start of data. */ | |
1683 | struct sdata first_data; | |
1684 | }; | |
1685 | ||
1686 | /* Number of Lisp strings in a string_block structure. The 1020 is | |
1687 | 1024 minus malloc overhead. */ | |
1688 | ||
19bcad1f | 1689 | #define STRING_BLOCK_SIZE \ |
2e471eb5 GM |
1690 | ((1020 - sizeof (struct string_block *)) / sizeof (struct Lisp_String)) |
1691 | ||
1692 | /* Structure describing a block from which Lisp_String structures | |
1693 | are allocated. */ | |
1694 | ||
1695 | struct string_block | |
7146af97 | 1696 | { |
6b61353c | 1697 | /* Place `strings' first, to preserve alignment. */ |
19bcad1f | 1698 | struct Lisp_String strings[STRING_BLOCK_SIZE]; |
6b61353c | 1699 | struct string_block *next; |
2e471eb5 | 1700 | }; |
7146af97 | 1701 | |
2e471eb5 GM |
1702 | /* Head and tail of the list of sblock structures holding Lisp string |
1703 | data. We always allocate from current_sblock. The NEXT pointers | |
1704 | in the sblock structures go from oldest_sblock to current_sblock. */ | |
3c06d205 | 1705 | |
2e471eb5 | 1706 | static struct sblock *oldest_sblock, *current_sblock; |
7146af97 | 1707 | |
2e471eb5 | 1708 | /* List of sblocks for large strings. */ |
7146af97 | 1709 | |
2e471eb5 | 1710 | static struct sblock *large_sblocks; |
7146af97 | 1711 | |
5a25e253 | 1712 | /* List of string_block structures. */ |
7146af97 | 1713 | |
2e471eb5 | 1714 | static struct string_block *string_blocks; |
7146af97 | 1715 | |
2e471eb5 | 1716 | /* Free-list of Lisp_Strings. */ |
7146af97 | 1717 | |
2e471eb5 | 1718 | static struct Lisp_String *string_free_list; |
7146af97 | 1719 | |
2e471eb5 | 1720 | /* Number of live and free Lisp_Strings. */ |
c8099634 | 1721 | |
c0c5c8ae | 1722 | static EMACS_INT total_strings, total_free_strings; |
7146af97 | 1723 | |
2e471eb5 GM |
1724 | /* Number of bytes used by live strings. */ |
1725 | ||
14162469 | 1726 | static EMACS_INT total_string_size; |
2e471eb5 GM |
1727 | |
1728 | /* Given a pointer to a Lisp_String S which is on the free-list | |
1729 | string_free_list, return a pointer to its successor in the | |
1730 | free-list. */ | |
1731 | ||
1732 | #define NEXT_FREE_LISP_STRING(S) (*(struct Lisp_String **) (S)) | |
1733 | ||
1734 | /* Return a pointer to the sdata structure belonging to Lisp string S. | |
1735 | S must be live, i.e. S->data must not be null. S->data is actually | |
1736 | a pointer to the `u.data' member of its sdata structure; the | |
1737 | structure starts at a constant offset in front of that. */ | |
177c0ea7 | 1738 | |
36372bf9 | 1739 | #define SDATA_OF_STRING(S) ((struct sdata *) ((S)->data - SDATA_DATA_OFFSET)) |
31d929e5 | 1740 | |
212f33f1 KS |
1741 | |
1742 | #ifdef GC_CHECK_STRING_OVERRUN | |
bdbed949 KS |
1743 | |
1744 | /* We check for overrun in string data blocks by appending a small | |
1745 | "cookie" after each allocated string data block, and check for the | |
8349069c | 1746 | presence of this cookie during GC. */ |
bdbed949 KS |
1747 | |
1748 | #define GC_STRING_OVERRUN_COOKIE_SIZE 4 | |
bfd1c781 PE |
1749 | static char const string_overrun_cookie[GC_STRING_OVERRUN_COOKIE_SIZE] = |
1750 | { '\xde', '\xad', '\xbe', '\xef' }; | |
bdbed949 | 1751 | |
212f33f1 | 1752 | #else |
bdbed949 | 1753 | #define GC_STRING_OVERRUN_COOKIE_SIZE 0 |
212f33f1 KS |
1754 | #endif |
1755 | ||
2e471eb5 GM |
1756 | /* Value is the size of an sdata structure large enough to hold NBYTES |
1757 | bytes of string data. The value returned includes a terminating | |
1758 | NUL byte, the size of the sdata structure, and padding. */ | |
1759 | ||
31d929e5 GM |
1760 | #ifdef GC_CHECK_STRING_BYTES |
1761 | ||
2e471eb5 | 1762 | #define SDATA_SIZE(NBYTES) \ |
36372bf9 | 1763 | ((SDATA_DATA_OFFSET \ |
2e471eb5 | 1764 | + (NBYTES) + 1 \ |
d311d28c PE |
1765 | + sizeof (ptrdiff_t) - 1) \ |
1766 | & ~(sizeof (ptrdiff_t) - 1)) | |
2e471eb5 | 1767 | |
31d929e5 GM |
1768 | #else /* not GC_CHECK_STRING_BYTES */ |
1769 | ||
f2d3008d PE |
1770 | /* The 'max' reserves space for the nbytes union member even when NBYTES + 1 is |
1771 | less than the size of that member. The 'max' is not needed when | |
d311d28c | 1772 | SDATA_DATA_OFFSET is a multiple of sizeof (ptrdiff_t), because then the |
f2d3008d PE |
1773 | alignment code reserves enough space. */ |
1774 | ||
1775 | #define SDATA_SIZE(NBYTES) \ | |
1776 | ((SDATA_DATA_OFFSET \ | |
d311d28c | 1777 | + (SDATA_DATA_OFFSET % sizeof (ptrdiff_t) == 0 \ |
f2d3008d | 1778 | ? NBYTES \ |
d311d28c | 1779 | : max (NBYTES, sizeof (ptrdiff_t) - 1)) \ |
f2d3008d | 1780 | + 1 \ |
d311d28c PE |
1781 | + sizeof (ptrdiff_t) - 1) \ |
1782 | & ~(sizeof (ptrdiff_t) - 1)) | |
31d929e5 GM |
1783 | |
1784 | #endif /* not GC_CHECK_STRING_BYTES */ | |
2e471eb5 | 1785 | |
bdbed949 KS |
1786 | /* Extra bytes to allocate for each string. */ |
1787 | ||
1788 | #define GC_STRING_EXTRA (GC_STRING_OVERRUN_COOKIE_SIZE) | |
1789 | ||
c9d624c6 PE |
1790 | /* Exact bound on the number of bytes in a string, not counting the |
1791 | terminating null. A string cannot contain more bytes than | |
1792 | STRING_BYTES_BOUND, nor can it be so long that the size_t | |
1793 | arithmetic in allocate_string_data would overflow while it is | |
1794 | calculating a value to be passed to malloc. */ | |
1795 | #define STRING_BYTES_MAX \ | |
1796 | min (STRING_BYTES_BOUND, \ | |
903fe15d PE |
1797 | ((SIZE_MAX - XMALLOC_OVERRUN_CHECK_OVERHEAD \ |
1798 | - GC_STRING_EXTRA \ | |
c9d624c6 PE |
1799 | - offsetof (struct sblock, first_data) \ |
1800 | - SDATA_DATA_OFFSET) \ | |
1801 | & ~(sizeof (EMACS_INT) - 1))) | |
1802 | ||
2e471eb5 | 1803 | /* Initialize string allocation. Called from init_alloc_once. */ |
d457598b | 1804 | |
d3d47262 | 1805 | static void |
971de7fb | 1806 | init_strings (void) |
7146af97 | 1807 | { |
2e471eb5 GM |
1808 | total_strings = total_free_strings = total_string_size = 0; |
1809 | oldest_sblock = current_sblock = large_sblocks = NULL; | |
1810 | string_blocks = NULL; | |
2e471eb5 | 1811 | string_free_list = NULL; |
4d774b0f JB |
1812 | empty_unibyte_string = make_pure_string ("", 0, 0, 0); |
1813 | empty_multibyte_string = make_pure_string ("", 0, 0, 1); | |
7146af97 JB |
1814 | } |
1815 | ||
2e471eb5 | 1816 | |
361b097f GM |
1817 | #ifdef GC_CHECK_STRING_BYTES |
1818 | ||
361b097f GM |
1819 | static int check_string_bytes_count; |
1820 | ||
676a7251 GM |
1821 | #define CHECK_STRING_BYTES(S) STRING_BYTES (S) |
1822 | ||
1823 | ||
1824 | /* Like GC_STRING_BYTES, but with debugging check. */ | |
1825 | ||
d311d28c | 1826 | ptrdiff_t |
14162469 | 1827 | string_bytes (struct Lisp_String *s) |
676a7251 | 1828 | { |
d311d28c | 1829 | ptrdiff_t nbytes = |
14162469 EZ |
1830 | (s->size_byte < 0 ? s->size & ~ARRAY_MARK_FLAG : s->size_byte); |
1831 | ||
676a7251 GM |
1832 | if (!PURE_POINTER_P (s) |
1833 | && s->data | |
1834 | && nbytes != SDATA_NBYTES (SDATA_OF_STRING (s))) | |
1835 | abort (); | |
1836 | return nbytes; | |
1837 | } | |
177c0ea7 | 1838 | |
2c5bd608 | 1839 | /* Check validity of Lisp strings' string_bytes member in B. */ |
676a7251 | 1840 | |
d3d47262 | 1841 | static void |
d0f4e1f5 | 1842 | check_sblock (struct sblock *b) |
361b097f | 1843 | { |
676a7251 | 1844 | struct sdata *from, *end, *from_end; |
177c0ea7 | 1845 | |
676a7251 | 1846 | end = b->next_free; |
177c0ea7 | 1847 | |
676a7251 | 1848 | for (from = &b->first_data; from < end; from = from_end) |
361b097f | 1849 | { |
676a7251 GM |
1850 | /* Compute the next FROM here because copying below may |
1851 | overwrite data we need to compute it. */ | |
d311d28c | 1852 | ptrdiff_t nbytes; |
177c0ea7 | 1853 | |
676a7251 GM |
1854 | /* Check that the string size recorded in the string is the |
1855 | same as the one recorded in the sdata structure. */ | |
1856 | if (from->string) | |
1857 | CHECK_STRING_BYTES (from->string); | |
177c0ea7 | 1858 | |
676a7251 GM |
1859 | if (from->string) |
1860 | nbytes = GC_STRING_BYTES (from->string); | |
1861 | else | |
1862 | nbytes = SDATA_NBYTES (from); | |
177c0ea7 | 1863 | |
676a7251 | 1864 | nbytes = SDATA_SIZE (nbytes); |
212f33f1 | 1865 | from_end = (struct sdata *) ((char *) from + nbytes + GC_STRING_EXTRA); |
676a7251 GM |
1866 | } |
1867 | } | |
361b097f | 1868 | |
676a7251 GM |
1869 | |
1870 | /* Check validity of Lisp strings' string_bytes member. ALL_P | |
1871 | non-zero means check all strings, otherwise check only most | |
1872 | recently allocated strings. Used for hunting a bug. */ | |
1873 | ||
d3d47262 | 1874 | static void |
d0f4e1f5 | 1875 | check_string_bytes (int all_p) |
676a7251 GM |
1876 | { |
1877 | if (all_p) | |
1878 | { | |
1879 | struct sblock *b; | |
1880 | ||
1881 | for (b = large_sblocks; b; b = b->next) | |
1882 | { | |
1883 | struct Lisp_String *s = b->first_data.string; | |
1884 | if (s) | |
1885 | CHECK_STRING_BYTES (s); | |
361b097f | 1886 | } |
177c0ea7 | 1887 | |
676a7251 GM |
1888 | for (b = oldest_sblock; b; b = b->next) |
1889 | check_sblock (b); | |
361b097f | 1890 | } |
676a7251 GM |
1891 | else |
1892 | check_sblock (current_sblock); | |
361b097f GM |
1893 | } |
1894 | ||
1895 | #endif /* GC_CHECK_STRING_BYTES */ | |
1896 | ||
212f33f1 KS |
1897 | #ifdef GC_CHECK_STRING_FREE_LIST |
1898 | ||
bdbed949 KS |
1899 | /* Walk through the string free list looking for bogus next pointers. |
1900 | This may catch buffer overrun from a previous string. */ | |
1901 | ||
212f33f1 | 1902 | static void |
d0f4e1f5 | 1903 | check_string_free_list (void) |
212f33f1 KS |
1904 | { |
1905 | struct Lisp_String *s; | |
1906 | ||
1907 | /* Pop a Lisp_String off the free-list. */ | |
1908 | s = string_free_list; | |
1909 | while (s != NULL) | |
1910 | { | |
d01a7826 | 1911 | if ((uintptr_t) s < 1024) |
5e617bc2 | 1912 | abort (); |
212f33f1 KS |
1913 | s = NEXT_FREE_LISP_STRING (s); |
1914 | } | |
1915 | } | |
1916 | #else | |
1917 | #define check_string_free_list() | |
1918 | #endif | |
361b097f | 1919 | |
2e471eb5 GM |
1920 | /* Return a new Lisp_String. */ |
1921 | ||
1922 | static struct Lisp_String * | |
971de7fb | 1923 | allocate_string (void) |
7146af97 | 1924 | { |
2e471eb5 | 1925 | struct Lisp_String *s; |
7146af97 | 1926 | |
e2984df0 CY |
1927 | /* eassert (!handling_signal); */ |
1928 | ||
dafc79fa | 1929 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 1930 | |
2e471eb5 GM |
1931 | /* If the free-list is empty, allocate a new string_block, and |
1932 | add all the Lisp_Strings in it to the free-list. */ | |
1933 | if (string_free_list == NULL) | |
7146af97 | 1934 | { |
2e471eb5 GM |
1935 | struct string_block *b; |
1936 | int i; | |
1937 | ||
34400008 | 1938 | b = (struct string_block *) lisp_malloc (sizeof *b, MEM_TYPE_STRING); |
72af86bd | 1939 | memset (b, 0, sizeof *b); |
2e471eb5 GM |
1940 | b->next = string_blocks; |
1941 | string_blocks = b; | |
2e471eb5 | 1942 | |
19bcad1f | 1943 | for (i = STRING_BLOCK_SIZE - 1; i >= 0; --i) |
7146af97 | 1944 | { |
2e471eb5 GM |
1945 | s = b->strings + i; |
1946 | NEXT_FREE_LISP_STRING (s) = string_free_list; | |
1947 | string_free_list = s; | |
7146af97 | 1948 | } |
2e471eb5 | 1949 | |
19bcad1f | 1950 | total_free_strings += STRING_BLOCK_SIZE; |
7146af97 | 1951 | } |
c0f51373 | 1952 | |
bdbed949 | 1953 | check_string_free_list (); |
212f33f1 | 1954 | |
2e471eb5 GM |
1955 | /* Pop a Lisp_String off the free-list. */ |
1956 | s = string_free_list; | |
1957 | string_free_list = NEXT_FREE_LISP_STRING (s); | |
c0f51373 | 1958 | |
dafc79fa | 1959 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 1960 | |
2e471eb5 | 1961 | /* Probably not strictly necessary, but play it safe. */ |
72af86bd | 1962 | memset (s, 0, sizeof *s); |
c0f51373 | 1963 | |
2e471eb5 GM |
1964 | --total_free_strings; |
1965 | ++total_strings; | |
1966 | ++strings_consed; | |
1967 | consing_since_gc += sizeof *s; | |
c0f51373 | 1968 | |
361b097f | 1969 | #ifdef GC_CHECK_STRING_BYTES |
e39a993c | 1970 | if (!noninteractive) |
361b097f | 1971 | { |
676a7251 GM |
1972 | if (++check_string_bytes_count == 200) |
1973 | { | |
1974 | check_string_bytes_count = 0; | |
1975 | check_string_bytes (1); | |
1976 | } | |
1977 | else | |
1978 | check_string_bytes (0); | |
361b097f | 1979 | } |
676a7251 | 1980 | #endif /* GC_CHECK_STRING_BYTES */ |
361b097f | 1981 | |
2e471eb5 | 1982 | return s; |
c0f51373 | 1983 | } |
7146af97 | 1984 | |
7146af97 | 1985 | |
2e471eb5 GM |
1986 | /* Set up Lisp_String S for holding NCHARS characters, NBYTES bytes, |
1987 | plus a NUL byte at the end. Allocate an sdata structure for S, and | |
1988 | set S->data to its `u.data' member. Store a NUL byte at the end of | |
1989 | S->data. Set S->size to NCHARS and S->size_byte to NBYTES. Free | |
1990 | S->data if it was initially non-null. */ | |
7146af97 | 1991 | |
2e471eb5 | 1992 | void |
413d18e7 EZ |
1993 | allocate_string_data (struct Lisp_String *s, |
1994 | EMACS_INT nchars, EMACS_INT nbytes) | |
7146af97 | 1995 | { |
5c5fecb3 | 1996 | struct sdata *data, *old_data; |
2e471eb5 | 1997 | struct sblock *b; |
d311d28c | 1998 | ptrdiff_t needed, old_nbytes; |
7146af97 | 1999 | |
c9d624c6 PE |
2000 | if (STRING_BYTES_MAX < nbytes) |
2001 | string_overflow (); | |
2002 | ||
2e471eb5 GM |
2003 | /* Determine the number of bytes needed to store NBYTES bytes |
2004 | of string data. */ | |
2005 | needed = SDATA_SIZE (nbytes); | |
e2984df0 CY |
2006 | old_data = s->data ? SDATA_OF_STRING (s) : NULL; |
2007 | old_nbytes = GC_STRING_BYTES (s); | |
2008 | ||
dafc79fa | 2009 | MALLOC_BLOCK_INPUT; |
7146af97 | 2010 | |
2e471eb5 GM |
2011 | if (nbytes > LARGE_STRING_BYTES) |
2012 | { | |
36372bf9 | 2013 | size_t size = offsetof (struct sblock, first_data) + needed; |
2e471eb5 GM |
2014 | |
2015 | #ifdef DOUG_LEA_MALLOC | |
f8608968 GM |
2016 | /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed |
2017 | because mapped region contents are not preserved in | |
d36b182f DL |
2018 | a dumped Emacs. |
2019 | ||
2020 | In case you think of allowing it in a dumped Emacs at the | |
2021 | cost of not being able to re-dump, there's another reason: | |
2022 | mmap'ed data typically have an address towards the top of the | |
2023 | address space, which won't fit into an EMACS_INT (at least on | |
2024 | 32-bit systems with the current tagging scheme). --fx */ | |
2e471eb5 GM |
2025 | mallopt (M_MMAP_MAX, 0); |
2026 | #endif | |
2027 | ||
212f33f1 | 2028 | b = (struct sblock *) lisp_malloc (size + GC_STRING_EXTRA, MEM_TYPE_NON_LISP); |
177c0ea7 | 2029 | |
2e471eb5 GM |
2030 | #ifdef DOUG_LEA_MALLOC |
2031 | /* Back to a reasonable maximum of mmap'ed areas. */ | |
2032 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); | |
2033 | #endif | |
177c0ea7 | 2034 | |
2e471eb5 GM |
2035 | b->next_free = &b->first_data; |
2036 | b->first_data.string = NULL; | |
2037 | b->next = large_sblocks; | |
2038 | large_sblocks = b; | |
2039 | } | |
2040 | else if (current_sblock == NULL | |
2041 | || (((char *) current_sblock + SBLOCK_SIZE | |
2042 | - (char *) current_sblock->next_free) | |
212f33f1 | 2043 | < (needed + GC_STRING_EXTRA))) |
2e471eb5 GM |
2044 | { |
2045 | /* Not enough room in the current sblock. */ | |
34400008 | 2046 | b = (struct sblock *) lisp_malloc (SBLOCK_SIZE, MEM_TYPE_NON_LISP); |
2e471eb5 GM |
2047 | b->next_free = &b->first_data; |
2048 | b->first_data.string = NULL; | |
2049 | b->next = NULL; | |
2050 | ||
2051 | if (current_sblock) | |
2052 | current_sblock->next = b; | |
2053 | else | |
2054 | oldest_sblock = b; | |
2055 | current_sblock = b; | |
2056 | } | |
2057 | else | |
2058 | b = current_sblock; | |
5c5fecb3 | 2059 | |
2e471eb5 | 2060 | data = b->next_free; |
a0b08700 CY |
2061 | b->next_free = (struct sdata *) ((char *) data + needed + GC_STRING_EXTRA); |
2062 | ||
dafc79fa | 2063 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 2064 | |
2e471eb5 | 2065 | data->string = s; |
31d929e5 GM |
2066 | s->data = SDATA_DATA (data); |
2067 | #ifdef GC_CHECK_STRING_BYTES | |
2068 | SDATA_NBYTES (data) = nbytes; | |
2069 | #endif | |
2e471eb5 GM |
2070 | s->size = nchars; |
2071 | s->size_byte = nbytes; | |
2072 | s->data[nbytes] = '\0'; | |
212f33f1 | 2073 | #ifdef GC_CHECK_STRING_OVERRUN |
000098c1 PE |
2074 | memcpy ((char *) data + needed, string_overrun_cookie, |
2075 | GC_STRING_OVERRUN_COOKIE_SIZE); | |
212f33f1 | 2076 | #endif |
177c0ea7 | 2077 | |
5c5fecb3 GM |
2078 | /* If S had already data assigned, mark that as free by setting its |
2079 | string back-pointer to null, and recording the size of the data | |
00c9c33c | 2080 | in it. */ |
5c5fecb3 GM |
2081 | if (old_data) |
2082 | { | |
31d929e5 | 2083 | SDATA_NBYTES (old_data) = old_nbytes; |
5c5fecb3 GM |
2084 | old_data->string = NULL; |
2085 | } | |
2086 | ||
2e471eb5 GM |
2087 | consing_since_gc += needed; |
2088 | } | |
2089 | ||
2090 | ||
2091 | /* Sweep and compact strings. */ | |
2092 | ||
2093 | static void | |
971de7fb | 2094 | sweep_strings (void) |
2e471eb5 GM |
2095 | { |
2096 | struct string_block *b, *next; | |
2097 | struct string_block *live_blocks = NULL; | |
177c0ea7 | 2098 | |
2e471eb5 GM |
2099 | string_free_list = NULL; |
2100 | total_strings = total_free_strings = 0; | |
2101 | total_string_size = 0; | |
2102 | ||
2103 | /* Scan strings_blocks, free Lisp_Strings that aren't marked. */ | |
2104 | for (b = string_blocks; b; b = next) | |
2105 | { | |
2106 | int i, nfree = 0; | |
2107 | struct Lisp_String *free_list_before = string_free_list; | |
2108 | ||
2109 | next = b->next; | |
2110 | ||
19bcad1f | 2111 | for (i = 0; i < STRING_BLOCK_SIZE; ++i) |
2e471eb5 GM |
2112 | { |
2113 | struct Lisp_String *s = b->strings + i; | |
2114 | ||
2115 | if (s->data) | |
2116 | { | |
2117 | /* String was not on free-list before. */ | |
2118 | if (STRING_MARKED_P (s)) | |
2119 | { | |
2120 | /* String is live; unmark it and its intervals. */ | |
2121 | UNMARK_STRING (s); | |
177c0ea7 | 2122 | |
2e471eb5 GM |
2123 | if (!NULL_INTERVAL_P (s->intervals)) |
2124 | UNMARK_BALANCE_INTERVALS (s->intervals); | |
2125 | ||
2126 | ++total_strings; | |
2127 | total_string_size += STRING_BYTES (s); | |
2128 | } | |
2129 | else | |
2130 | { | |
2131 | /* String is dead. Put it on the free-list. */ | |
2132 | struct sdata *data = SDATA_OF_STRING (s); | |
2133 | ||
2134 | /* Save the size of S in its sdata so that we know | |
2135 | how large that is. Reset the sdata's string | |
2136 | back-pointer so that we know it's free. */ | |
31d929e5 GM |
2137 | #ifdef GC_CHECK_STRING_BYTES |
2138 | if (GC_STRING_BYTES (s) != SDATA_NBYTES (data)) | |
2139 | abort (); | |
2140 | #else | |
2e471eb5 | 2141 | data->u.nbytes = GC_STRING_BYTES (s); |
31d929e5 | 2142 | #endif |
2e471eb5 GM |
2143 | data->string = NULL; |
2144 | ||
2145 | /* Reset the strings's `data' member so that we | |
2146 | know it's free. */ | |
2147 | s->data = NULL; | |
2148 | ||
2149 | /* Put the string on the free-list. */ | |
2150 | NEXT_FREE_LISP_STRING (s) = string_free_list; | |
2151 | string_free_list = s; | |
2152 | ++nfree; | |
2153 | } | |
2154 | } | |
2155 | else | |
2156 | { | |
2157 | /* S was on the free-list before. Put it there again. */ | |
2158 | NEXT_FREE_LISP_STRING (s) = string_free_list; | |
2159 | string_free_list = s; | |
2160 | ++nfree; | |
2161 | } | |
2162 | } | |
2163 | ||
34400008 | 2164 | /* Free blocks that contain free Lisp_Strings only, except |
2e471eb5 | 2165 | the first two of them. */ |
19bcad1f SM |
2166 | if (nfree == STRING_BLOCK_SIZE |
2167 | && total_free_strings > STRING_BLOCK_SIZE) | |
2e471eb5 GM |
2168 | { |
2169 | lisp_free (b); | |
2e471eb5 GM |
2170 | string_free_list = free_list_before; |
2171 | } | |
2172 | else | |
2173 | { | |
2174 | total_free_strings += nfree; | |
2175 | b->next = live_blocks; | |
2176 | live_blocks = b; | |
2177 | } | |
2178 | } | |
2179 | ||
bdbed949 | 2180 | check_string_free_list (); |
212f33f1 | 2181 | |
2e471eb5 GM |
2182 | string_blocks = live_blocks; |
2183 | free_large_strings (); | |
2184 | compact_small_strings (); | |
212f33f1 | 2185 | |
bdbed949 | 2186 | check_string_free_list (); |
2e471eb5 GM |
2187 | } |
2188 | ||
2189 | ||
2190 | /* Free dead large strings. */ | |
2191 | ||
2192 | static void | |
971de7fb | 2193 | free_large_strings (void) |
2e471eb5 GM |
2194 | { |
2195 | struct sblock *b, *next; | |
2196 | struct sblock *live_blocks = NULL; | |
177c0ea7 | 2197 | |
2e471eb5 GM |
2198 | for (b = large_sblocks; b; b = next) |
2199 | { | |
2200 | next = b->next; | |
2201 | ||
2202 | if (b->first_data.string == NULL) | |
2203 | lisp_free (b); | |
2204 | else | |
2205 | { | |
2206 | b->next = live_blocks; | |
2207 | live_blocks = b; | |
2208 | } | |
2209 | } | |
2210 | ||
2211 | large_sblocks = live_blocks; | |
2212 | } | |
2213 | ||
2214 | ||
2215 | /* Compact data of small strings. Free sblocks that don't contain | |
2216 | data of live strings after compaction. */ | |
2217 | ||
2218 | static void | |
971de7fb | 2219 | compact_small_strings (void) |
2e471eb5 GM |
2220 | { |
2221 | struct sblock *b, *tb, *next; | |
2222 | struct sdata *from, *to, *end, *tb_end; | |
2223 | struct sdata *to_end, *from_end; | |
2224 | ||
2225 | /* TB is the sblock we copy to, TO is the sdata within TB we copy | |
2226 | to, and TB_END is the end of TB. */ | |
2227 | tb = oldest_sblock; | |
2228 | tb_end = (struct sdata *) ((char *) tb + SBLOCK_SIZE); | |
2229 | to = &tb->first_data; | |
2230 | ||
2231 | /* Step through the blocks from the oldest to the youngest. We | |
2232 | expect that old blocks will stabilize over time, so that less | |
2233 | copying will happen this way. */ | |
2234 | for (b = oldest_sblock; b; b = b->next) | |
2235 | { | |
2236 | end = b->next_free; | |
2237 | xassert ((char *) end <= (char *) b + SBLOCK_SIZE); | |
177c0ea7 | 2238 | |
2e471eb5 GM |
2239 | for (from = &b->first_data; from < end; from = from_end) |
2240 | { | |
2241 | /* Compute the next FROM here because copying below may | |
2242 | overwrite data we need to compute it. */ | |
d311d28c | 2243 | ptrdiff_t nbytes; |
2e471eb5 | 2244 | |
31d929e5 GM |
2245 | #ifdef GC_CHECK_STRING_BYTES |
2246 | /* Check that the string size recorded in the string is the | |
2247 | same as the one recorded in the sdata structure. */ | |
2248 | if (from->string | |
2249 | && GC_STRING_BYTES (from->string) != SDATA_NBYTES (from)) | |
2250 | abort (); | |
2251 | #endif /* GC_CHECK_STRING_BYTES */ | |
177c0ea7 | 2252 | |
2e471eb5 GM |
2253 | if (from->string) |
2254 | nbytes = GC_STRING_BYTES (from->string); | |
2255 | else | |
31d929e5 | 2256 | nbytes = SDATA_NBYTES (from); |
177c0ea7 | 2257 | |
212f33f1 KS |
2258 | if (nbytes > LARGE_STRING_BYTES) |
2259 | abort (); | |
212f33f1 | 2260 | |
2e471eb5 | 2261 | nbytes = SDATA_SIZE (nbytes); |
212f33f1 KS |
2262 | from_end = (struct sdata *) ((char *) from + nbytes + GC_STRING_EXTRA); |
2263 | ||
2264 | #ifdef GC_CHECK_STRING_OVERRUN | |
72af86bd AS |
2265 | if (memcmp (string_overrun_cookie, |
2266 | (char *) from_end - GC_STRING_OVERRUN_COOKIE_SIZE, | |
2267 | GC_STRING_OVERRUN_COOKIE_SIZE)) | |
212f33f1 KS |
2268 | abort (); |
2269 | #endif | |
177c0ea7 | 2270 | |
2e471eb5 GM |
2271 | /* FROM->string non-null means it's alive. Copy its data. */ |
2272 | if (from->string) | |
2273 | { | |
2274 | /* If TB is full, proceed with the next sblock. */ | |
212f33f1 | 2275 | to_end = (struct sdata *) ((char *) to + nbytes + GC_STRING_EXTRA); |
2e471eb5 GM |
2276 | if (to_end > tb_end) |
2277 | { | |
2278 | tb->next_free = to; | |
2279 | tb = tb->next; | |
2280 | tb_end = (struct sdata *) ((char *) tb + SBLOCK_SIZE); | |
2281 | to = &tb->first_data; | |
212f33f1 | 2282 | to_end = (struct sdata *) ((char *) to + nbytes + GC_STRING_EXTRA); |
2e471eb5 | 2283 | } |
177c0ea7 | 2284 | |
2e471eb5 GM |
2285 | /* Copy, and update the string's `data' pointer. */ |
2286 | if (from != to) | |
2287 | { | |
3c616cfa | 2288 | xassert (tb != b || to < from); |
72af86bd | 2289 | memmove (to, from, nbytes + GC_STRING_EXTRA); |
31d929e5 | 2290 | to->string->data = SDATA_DATA (to); |
2e471eb5 GM |
2291 | } |
2292 | ||
2293 | /* Advance past the sdata we copied to. */ | |
2294 | to = to_end; | |
2295 | } | |
2296 | } | |
2297 | } | |
2298 | ||
2299 | /* The rest of the sblocks following TB don't contain live data, so | |
2300 | we can free them. */ | |
2301 | for (b = tb->next; b; b = next) | |
2302 | { | |
2303 | next = b->next; | |
2304 | lisp_free (b); | |
2305 | } | |
2306 | ||
2307 | tb->next_free = to; | |
2308 | tb->next = NULL; | |
2309 | current_sblock = tb; | |
2310 | } | |
2311 | ||
cb93f9be PE |
2312 | void |
2313 | string_overflow (void) | |
2314 | { | |
2315 | error ("Maximum string size exceeded"); | |
2316 | } | |
2e471eb5 | 2317 | |
a7ca3326 | 2318 | DEFUN ("make-string", Fmake_string, Smake_string, 2, 2, 0, |
69623621 RS |
2319 | doc: /* Return a newly created string of length LENGTH, with INIT in each element. |
2320 | LENGTH must be an integer. | |
2321 | INIT must be an integer that represents a character. */) | |
5842a27b | 2322 | (Lisp_Object length, Lisp_Object init) |
2e471eb5 GM |
2323 | { |
2324 | register Lisp_Object val; | |
2325 | register unsigned char *p, *end; | |
14162469 EZ |
2326 | int c; |
2327 | EMACS_INT nbytes; | |
2e471eb5 | 2328 | |
b7826503 | 2329 | CHECK_NATNUM (length); |
2bccce07 | 2330 | CHECK_CHARACTER (init); |
2e471eb5 | 2331 | |
2bccce07 | 2332 | c = XFASTINT (init); |
830ff83b | 2333 | if (ASCII_CHAR_P (c)) |
2e471eb5 GM |
2334 | { |
2335 | nbytes = XINT (length); | |
2336 | val = make_uninit_string (nbytes); | |
d5db4077 KR |
2337 | p = SDATA (val); |
2338 | end = p + SCHARS (val); | |
2e471eb5 GM |
2339 | while (p != end) |
2340 | *p++ = c; | |
2341 | } | |
2342 | else | |
2343 | { | |
d942b71c | 2344 | unsigned char str[MAX_MULTIBYTE_LENGTH]; |
2e471eb5 | 2345 | int len = CHAR_STRING (c, str); |
14162469 | 2346 | EMACS_INT string_len = XINT (length); |
2e471eb5 | 2347 | |
d1f3d2af | 2348 | if (string_len > STRING_BYTES_MAX / len) |
cb93f9be | 2349 | string_overflow (); |
14162469 EZ |
2350 | nbytes = len * string_len; |
2351 | val = make_uninit_multibyte_string (string_len, nbytes); | |
d5db4077 | 2352 | p = SDATA (val); |
2e471eb5 GM |
2353 | end = p + nbytes; |
2354 | while (p != end) | |
2355 | { | |
72af86bd | 2356 | memcpy (p, str, len); |
2e471eb5 GM |
2357 | p += len; |
2358 | } | |
2359 | } | |
177c0ea7 | 2360 | |
2e471eb5 GM |
2361 | *p = 0; |
2362 | return val; | |
2363 | } | |
2364 | ||
2365 | ||
a7ca3326 | 2366 | DEFUN ("make-bool-vector", Fmake_bool_vector, Smake_bool_vector, 2, 2, 0, |
909e3b33 | 2367 | doc: /* Return a new bool-vector of length LENGTH, using INIT for each element. |
7ee72033 | 2368 | LENGTH must be a number. INIT matters only in whether it is t or nil. */) |
5842a27b | 2369 | (Lisp_Object length, Lisp_Object init) |
2e471eb5 GM |
2370 | { |
2371 | register Lisp_Object val; | |
2372 | struct Lisp_Bool_Vector *p; | |
d311d28c PE |
2373 | ptrdiff_t length_in_chars; |
2374 | EMACS_INT length_in_elts; | |
14162469 | 2375 | int bits_per_value; |
2e471eb5 | 2376 | |
b7826503 | 2377 | CHECK_NATNUM (length); |
2e471eb5 | 2378 | |
a097329f | 2379 | bits_per_value = sizeof (EMACS_INT) * BOOL_VECTOR_BITS_PER_CHAR; |
2e471eb5 GM |
2380 | |
2381 | length_in_elts = (XFASTINT (length) + bits_per_value - 1) / bits_per_value; | |
2e471eb5 GM |
2382 | |
2383 | /* We must allocate one more elements than LENGTH_IN_ELTS for the | |
2384 | slot `size' of the struct Lisp_Bool_Vector. */ | |
2385 | val = Fmake_vector (make_number (length_in_elts + 1), Qnil); | |
177c0ea7 | 2386 | |
eab3844f PE |
2387 | /* No Lisp_Object to trace in there. */ |
2388 | XSETPVECTYPESIZE (XVECTOR (val), PVEC_BOOL_VECTOR, 0); | |
d2029e5b SM |
2389 | |
2390 | p = XBOOL_VECTOR (val); | |
2e471eb5 | 2391 | p->size = XFASTINT (length); |
177c0ea7 | 2392 | |
d311d28c PE |
2393 | length_in_chars = ((XFASTINT (length) + BOOL_VECTOR_BITS_PER_CHAR - 1) |
2394 | / BOOL_VECTOR_BITS_PER_CHAR); | |
c0c1ee9f PE |
2395 | if (length_in_chars) |
2396 | { | |
2397 | memset (p->data, ! NILP (init) ? -1 : 0, length_in_chars); | |
177c0ea7 | 2398 | |
c0c1ee9f PE |
2399 | /* Clear any extraneous bits in the last byte. */ |
2400 | p->data[length_in_chars - 1] | |
2401 | &= (1 << (XINT (length) % BOOL_VECTOR_BITS_PER_CHAR)) - 1; | |
2402 | } | |
2e471eb5 GM |
2403 | |
2404 | return val; | |
2405 | } | |
2406 | ||
2407 | ||
2408 | /* Make a string from NBYTES bytes at CONTENTS, and compute the number | |
2409 | of characters from the contents. This string may be unibyte or | |
2410 | multibyte, depending on the contents. */ | |
2411 | ||
2412 | Lisp_Object | |
d311d28c | 2413 | make_string (const char *contents, ptrdiff_t nbytes) |
2e471eb5 GM |
2414 | { |
2415 | register Lisp_Object val; | |
d311d28c | 2416 | ptrdiff_t nchars, multibyte_nbytes; |
9eac9d59 | 2417 | |
90256841 PE |
2418 | parse_str_as_multibyte ((const unsigned char *) contents, nbytes, |
2419 | &nchars, &multibyte_nbytes); | |
9eac9d59 KH |
2420 | if (nbytes == nchars || nbytes != multibyte_nbytes) |
2421 | /* CONTENTS contains no multibyte sequences or contains an invalid | |
2422 | multibyte sequence. We must make unibyte string. */ | |
495a6df3 KH |
2423 | val = make_unibyte_string (contents, nbytes); |
2424 | else | |
2425 | val = make_multibyte_string (contents, nchars, nbytes); | |
2e471eb5 GM |
2426 | return val; |
2427 | } | |
2428 | ||
2429 | ||
2430 | /* Make an unibyte string from LENGTH bytes at CONTENTS. */ | |
2431 | ||
2432 | Lisp_Object | |
d311d28c | 2433 | make_unibyte_string (const char *contents, ptrdiff_t length) |
2e471eb5 GM |
2434 | { |
2435 | register Lisp_Object val; | |
2436 | val = make_uninit_string (length); | |
72af86bd | 2437 | memcpy (SDATA (val), contents, length); |
2e471eb5 GM |
2438 | return val; |
2439 | } | |
2440 | ||
2441 | ||
2442 | /* Make a multibyte string from NCHARS characters occupying NBYTES | |
2443 | bytes at CONTENTS. */ | |
2444 | ||
2445 | Lisp_Object | |
14162469 | 2446 | make_multibyte_string (const char *contents, |
d311d28c | 2447 | ptrdiff_t nchars, ptrdiff_t nbytes) |
2e471eb5 GM |
2448 | { |
2449 | register Lisp_Object val; | |
2450 | val = make_uninit_multibyte_string (nchars, nbytes); | |
72af86bd | 2451 | memcpy (SDATA (val), contents, nbytes); |
2e471eb5 GM |
2452 | return val; |
2453 | } | |
2454 | ||
2455 | ||
2456 | /* Make a string from NCHARS characters occupying NBYTES bytes at | |
2457 | CONTENTS. It is a multibyte string if NBYTES != NCHARS. */ | |
2458 | ||
2459 | Lisp_Object | |
14162469 | 2460 | make_string_from_bytes (const char *contents, |
d311d28c | 2461 | ptrdiff_t nchars, ptrdiff_t nbytes) |
2e471eb5 GM |
2462 | { |
2463 | register Lisp_Object val; | |
2464 | val = make_uninit_multibyte_string (nchars, nbytes); | |
72af86bd | 2465 | memcpy (SDATA (val), contents, nbytes); |
d5db4077 KR |
2466 | if (SBYTES (val) == SCHARS (val)) |
2467 | STRING_SET_UNIBYTE (val); | |
2e471eb5 GM |
2468 | return val; |
2469 | } | |
2470 | ||
2471 | ||
2472 | /* Make a string from NCHARS characters occupying NBYTES bytes at | |
2473 | CONTENTS. The argument MULTIBYTE controls whether to label the | |
229b28c4 KH |
2474 | string as multibyte. If NCHARS is negative, it counts the number of |
2475 | characters by itself. */ | |
2e471eb5 GM |
2476 | |
2477 | Lisp_Object | |
14162469 | 2478 | make_specified_string (const char *contents, |
d311d28c | 2479 | ptrdiff_t nchars, ptrdiff_t nbytes, int multibyte) |
2e471eb5 GM |
2480 | { |
2481 | register Lisp_Object val; | |
229b28c4 KH |
2482 | |
2483 | if (nchars < 0) | |
2484 | { | |
2485 | if (multibyte) | |
90256841 PE |
2486 | nchars = multibyte_chars_in_text ((const unsigned char *) contents, |
2487 | nbytes); | |
229b28c4 KH |
2488 | else |
2489 | nchars = nbytes; | |
2490 | } | |
2e471eb5 | 2491 | val = make_uninit_multibyte_string (nchars, nbytes); |
72af86bd | 2492 | memcpy (SDATA (val), contents, nbytes); |
2e471eb5 | 2493 | if (!multibyte) |
d5db4077 | 2494 | STRING_SET_UNIBYTE (val); |
2e471eb5 GM |
2495 | return val; |
2496 | } | |
2497 | ||
2498 | ||
2e471eb5 GM |
2499 | /* Return an unibyte Lisp_String set up to hold LENGTH characters |
2500 | occupying LENGTH bytes. */ | |
2501 | ||
2502 | Lisp_Object | |
413d18e7 | 2503 | make_uninit_string (EMACS_INT length) |
2e471eb5 GM |
2504 | { |
2505 | Lisp_Object val; | |
4d774b0f JB |
2506 | |
2507 | if (!length) | |
2508 | return empty_unibyte_string; | |
2e471eb5 | 2509 | val = make_uninit_multibyte_string (length, length); |
d5db4077 | 2510 | STRING_SET_UNIBYTE (val); |
2e471eb5 GM |
2511 | return val; |
2512 | } | |
2513 | ||
2514 | ||
2515 | /* Return a multibyte Lisp_String set up to hold NCHARS characters | |
2516 | which occupy NBYTES bytes. */ | |
2517 | ||
2518 | Lisp_Object | |
413d18e7 | 2519 | make_uninit_multibyte_string (EMACS_INT nchars, EMACS_INT nbytes) |
2e471eb5 GM |
2520 | { |
2521 | Lisp_Object string; | |
2522 | struct Lisp_String *s; | |
2523 | ||
2524 | if (nchars < 0) | |
2525 | abort (); | |
4d774b0f JB |
2526 | if (!nbytes) |
2527 | return empty_multibyte_string; | |
2e471eb5 GM |
2528 | |
2529 | s = allocate_string (); | |
2530 | allocate_string_data (s, nchars, nbytes); | |
2531 | XSETSTRING (string, s); | |
2532 | string_chars_consed += nbytes; | |
2533 | return string; | |
2534 | } | |
2535 | ||
2536 | ||
2537 | \f | |
2538 | /*********************************************************************** | |
2539 | Float Allocation | |
2540 | ***********************************************************************/ | |
2541 | ||
2e471eb5 GM |
2542 | /* We store float cells inside of float_blocks, allocating a new |
2543 | float_block with malloc whenever necessary. Float cells reclaimed | |
2544 | by GC are put on a free list to be reallocated before allocating | |
ab6780cd | 2545 | any new float cells from the latest float_block. */ |
2e471eb5 | 2546 | |
6b61353c KH |
2547 | #define FLOAT_BLOCK_SIZE \ |
2548 | (((BLOCK_BYTES - sizeof (struct float_block *) \ | |
2549 | /* The compiler might add padding at the end. */ \ | |
2550 | - (sizeof (struct Lisp_Float) - sizeof (int))) * CHAR_BIT) \ | |
ab6780cd SM |
2551 | / (sizeof (struct Lisp_Float) * CHAR_BIT + 1)) |
2552 | ||
2553 | #define GETMARKBIT(block,n) \ | |
5e617bc2 JB |
2554 | (((block)->gcmarkbits[(n) / (sizeof (int) * CHAR_BIT)] \ |
2555 | >> ((n) % (sizeof (int) * CHAR_BIT))) \ | |
ab6780cd SM |
2556 | & 1) |
2557 | ||
2558 | #define SETMARKBIT(block,n) \ | |
5e617bc2 JB |
2559 | (block)->gcmarkbits[(n) / (sizeof (int) * CHAR_BIT)] \ |
2560 | |= 1 << ((n) % (sizeof (int) * CHAR_BIT)) | |
ab6780cd SM |
2561 | |
2562 | #define UNSETMARKBIT(block,n) \ | |
5e617bc2 JB |
2563 | (block)->gcmarkbits[(n) / (sizeof (int) * CHAR_BIT)] \ |
2564 | &= ~(1 << ((n) % (sizeof (int) * CHAR_BIT))) | |
ab6780cd SM |
2565 | |
2566 | #define FLOAT_BLOCK(fptr) \ | |
d01a7826 | 2567 | ((struct float_block *) (((uintptr_t) (fptr)) & ~(BLOCK_ALIGN - 1))) |
ab6780cd SM |
2568 | |
2569 | #define FLOAT_INDEX(fptr) \ | |
d01a7826 | 2570 | ((((uintptr_t) (fptr)) & (BLOCK_ALIGN - 1)) / sizeof (struct Lisp_Float)) |
2e471eb5 GM |
2571 | |
2572 | struct float_block | |
2573 | { | |
ab6780cd | 2574 | /* Place `floats' at the beginning, to ease up FLOAT_INDEX's job. */ |
2e471eb5 | 2575 | struct Lisp_Float floats[FLOAT_BLOCK_SIZE]; |
5e617bc2 | 2576 | int gcmarkbits[1 + FLOAT_BLOCK_SIZE / (sizeof (int) * CHAR_BIT)]; |
ab6780cd | 2577 | struct float_block *next; |
2e471eb5 GM |
2578 | }; |
2579 | ||
ab6780cd SM |
2580 | #define FLOAT_MARKED_P(fptr) \ |
2581 | GETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr))) | |
2582 | ||
2583 | #define FLOAT_MARK(fptr) \ | |
2584 | SETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr))) | |
2585 | ||
2586 | #define FLOAT_UNMARK(fptr) \ | |
2587 | UNSETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr))) | |
2588 | ||
34400008 GM |
2589 | /* Current float_block. */ |
2590 | ||
244ed907 | 2591 | static struct float_block *float_block; |
34400008 GM |
2592 | |
2593 | /* Index of first unused Lisp_Float in the current float_block. */ | |
2594 | ||
244ed907 | 2595 | static int float_block_index; |
2e471eb5 | 2596 | |
34400008 GM |
2597 | /* Free-list of Lisp_Floats. */ |
2598 | ||
244ed907 | 2599 | static struct Lisp_Float *float_free_list; |
2e471eb5 | 2600 | |
34400008 | 2601 | |
966533c9 | 2602 | /* Initialize float allocation. */ |
34400008 | 2603 | |
d3d47262 | 2604 | static void |
971de7fb | 2605 | init_float (void) |
2e471eb5 | 2606 | { |
08b7c2cb SM |
2607 | float_block = NULL; |
2608 | float_block_index = FLOAT_BLOCK_SIZE; /* Force alloc of new float_block. */ | |
2e471eb5 | 2609 | float_free_list = 0; |
2e471eb5 GM |
2610 | } |
2611 | ||
34400008 | 2612 | |
34400008 GM |
2613 | /* Return a new float object with value FLOAT_VALUE. */ |
2614 | ||
2e471eb5 | 2615 | Lisp_Object |
971de7fb | 2616 | make_float (double float_value) |
2e471eb5 GM |
2617 | { |
2618 | register Lisp_Object val; | |
2619 | ||
e2984df0 CY |
2620 | /* eassert (!handling_signal); */ |
2621 | ||
dafc79fa | 2622 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 2623 | |
2e471eb5 GM |
2624 | if (float_free_list) |
2625 | { | |
2626 | /* We use the data field for chaining the free list | |
2627 | so that we won't use the same field that has the mark bit. */ | |
2628 | XSETFLOAT (val, float_free_list); | |
28a099a4 | 2629 | float_free_list = float_free_list->u.chain; |
2e471eb5 GM |
2630 | } |
2631 | else | |
2632 | { | |
2633 | if (float_block_index == FLOAT_BLOCK_SIZE) | |
2634 | { | |
2635 | register struct float_block *new; | |
2636 | ||
ab6780cd SM |
2637 | new = (struct float_block *) lisp_align_malloc (sizeof *new, |
2638 | MEM_TYPE_FLOAT); | |
2e471eb5 | 2639 | new->next = float_block; |
72af86bd | 2640 | memset (new->gcmarkbits, 0, sizeof new->gcmarkbits); |
2e471eb5 GM |
2641 | float_block = new; |
2642 | float_block_index = 0; | |
2e471eb5 | 2643 | } |
6b61353c KH |
2644 | XSETFLOAT (val, &float_block->floats[float_block_index]); |
2645 | float_block_index++; | |
2e471eb5 | 2646 | } |
177c0ea7 | 2647 | |
dafc79fa | 2648 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 2649 | |
f601cdf3 | 2650 | XFLOAT_INIT (val, float_value); |
6b61353c | 2651 | eassert (!FLOAT_MARKED_P (XFLOAT (val))); |
2e471eb5 GM |
2652 | consing_since_gc += sizeof (struct Lisp_Float); |
2653 | floats_consed++; | |
2654 | return val; | |
2655 | } | |
2656 | ||
2e471eb5 GM |
2657 | |
2658 | \f | |
2659 | /*********************************************************************** | |
2660 | Cons Allocation | |
2661 | ***********************************************************************/ | |
2662 | ||
2663 | /* We store cons cells inside of cons_blocks, allocating a new | |
2664 | cons_block with malloc whenever necessary. Cons cells reclaimed by | |
2665 | GC are put on a free list to be reallocated before allocating | |
08b7c2cb | 2666 | any new cons cells from the latest cons_block. */ |
2e471eb5 | 2667 | |
a2821611 AS |
2668 | #define CONS_BLOCK_SIZE \ |
2669 | (((BLOCK_BYTES - sizeof (struct cons_block *) \ | |
2670 | /* The compiler might add padding at the end. */ \ | |
2671 | - (sizeof (struct Lisp_Cons) - sizeof (int))) * CHAR_BIT) \ | |
08b7c2cb SM |
2672 | / (sizeof (struct Lisp_Cons) * CHAR_BIT + 1)) |
2673 | ||
2674 | #define CONS_BLOCK(fptr) \ | |
d01a7826 | 2675 | ((struct cons_block *) ((uintptr_t) (fptr) & ~(BLOCK_ALIGN - 1))) |
08b7c2cb SM |
2676 | |
2677 | #define CONS_INDEX(fptr) \ | |
d01a7826 | 2678 | (((uintptr_t) (fptr) & (BLOCK_ALIGN - 1)) / sizeof (struct Lisp_Cons)) |
2e471eb5 GM |
2679 | |
2680 | struct cons_block | |
2681 | { | |
08b7c2cb | 2682 | /* Place `conses' at the beginning, to ease up CONS_INDEX's job. */ |
2e471eb5 | 2683 | struct Lisp_Cons conses[CONS_BLOCK_SIZE]; |
5e617bc2 | 2684 | int gcmarkbits[1 + CONS_BLOCK_SIZE / (sizeof (int) * CHAR_BIT)]; |
08b7c2cb | 2685 | struct cons_block *next; |
2e471eb5 GM |
2686 | }; |
2687 | ||
08b7c2cb SM |
2688 | #define CONS_MARKED_P(fptr) \ |
2689 | GETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr))) | |
2690 | ||
2691 | #define CONS_MARK(fptr) \ | |
2692 | SETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr))) | |
2693 | ||
2694 | #define CONS_UNMARK(fptr) \ | |
2695 | UNSETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr))) | |
2696 | ||
34400008 GM |
2697 | /* Current cons_block. */ |
2698 | ||
244ed907 | 2699 | static struct cons_block *cons_block; |
34400008 GM |
2700 | |
2701 | /* Index of first unused Lisp_Cons in the current block. */ | |
2702 | ||
244ed907 | 2703 | static int cons_block_index; |
2e471eb5 | 2704 | |
34400008 GM |
2705 | /* Free-list of Lisp_Cons structures. */ |
2706 | ||
244ed907 | 2707 | static struct Lisp_Cons *cons_free_list; |
2e471eb5 | 2708 | |
34400008 GM |
2709 | |
2710 | /* Initialize cons allocation. */ | |
2711 | ||
d3d47262 | 2712 | static void |
971de7fb | 2713 | init_cons (void) |
2e471eb5 | 2714 | { |
08b7c2cb SM |
2715 | cons_block = NULL; |
2716 | cons_block_index = CONS_BLOCK_SIZE; /* Force alloc of new cons_block. */ | |
2e471eb5 | 2717 | cons_free_list = 0; |
2e471eb5 GM |
2718 | } |
2719 | ||
34400008 GM |
2720 | |
2721 | /* Explicitly free a cons cell by putting it on the free-list. */ | |
2e471eb5 GM |
2722 | |
2723 | void | |
971de7fb | 2724 | free_cons (struct Lisp_Cons *ptr) |
2e471eb5 | 2725 | { |
28a099a4 | 2726 | ptr->u.chain = cons_free_list; |
34400008 GM |
2727 | #if GC_MARK_STACK |
2728 | ptr->car = Vdead; | |
2729 | #endif | |
2e471eb5 GM |
2730 | cons_free_list = ptr; |
2731 | } | |
2732 | ||
a7ca3326 | 2733 | DEFUN ("cons", Fcons, Scons, 2, 2, 0, |
a6266d23 | 2734 | doc: /* Create a new cons, give it CAR and CDR as components, and return it. */) |
5842a27b | 2735 | (Lisp_Object car, Lisp_Object cdr) |
2e471eb5 GM |
2736 | { |
2737 | register Lisp_Object val; | |
2738 | ||
e2984df0 CY |
2739 | /* eassert (!handling_signal); */ |
2740 | ||
dafc79fa | 2741 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 2742 | |
2e471eb5 GM |
2743 | if (cons_free_list) |
2744 | { | |
2745 | /* We use the cdr for chaining the free list | |
2746 | so that we won't use the same field that has the mark bit. */ | |
2747 | XSETCONS (val, cons_free_list); | |
28a099a4 | 2748 | cons_free_list = cons_free_list->u.chain; |
2e471eb5 GM |
2749 | } |
2750 | else | |
2751 | { | |
2752 | if (cons_block_index == CONS_BLOCK_SIZE) | |
2753 | { | |
2754 | register struct cons_block *new; | |
08b7c2cb SM |
2755 | new = (struct cons_block *) lisp_align_malloc (sizeof *new, |
2756 | MEM_TYPE_CONS); | |
72af86bd | 2757 | memset (new->gcmarkbits, 0, sizeof new->gcmarkbits); |
2e471eb5 GM |
2758 | new->next = cons_block; |
2759 | cons_block = new; | |
2760 | cons_block_index = 0; | |
2e471eb5 | 2761 | } |
6b61353c KH |
2762 | XSETCONS (val, &cons_block->conses[cons_block_index]); |
2763 | cons_block_index++; | |
2e471eb5 | 2764 | } |
177c0ea7 | 2765 | |
dafc79fa | 2766 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 2767 | |
f3fbd155 KR |
2768 | XSETCAR (val, car); |
2769 | XSETCDR (val, cdr); | |
6b61353c | 2770 | eassert (!CONS_MARKED_P (XCONS (val))); |
2e471eb5 GM |
2771 | consing_since_gc += sizeof (struct Lisp_Cons); |
2772 | cons_cells_consed++; | |
2773 | return val; | |
2774 | } | |
2775 | ||
e5aab7e7 | 2776 | #ifdef GC_CHECK_CONS_LIST |
e3e56238 RS |
2777 | /* Get an error now if there's any junk in the cons free list. */ |
2778 | void | |
971de7fb | 2779 | check_cons_list (void) |
e3e56238 RS |
2780 | { |
2781 | struct Lisp_Cons *tail = cons_free_list; | |
2782 | ||
e3e56238 | 2783 | while (tail) |
28a099a4 | 2784 | tail = tail->u.chain; |
e3e56238 | 2785 | } |
e5aab7e7 | 2786 | #endif |
34400008 | 2787 | |
9b306d37 KS |
2788 | /* Make a list of 1, 2, 3, 4 or 5 specified objects. */ |
2789 | ||
2790 | Lisp_Object | |
971de7fb | 2791 | list1 (Lisp_Object arg1) |
9b306d37 KS |
2792 | { |
2793 | return Fcons (arg1, Qnil); | |
2794 | } | |
2e471eb5 GM |
2795 | |
2796 | Lisp_Object | |
971de7fb | 2797 | list2 (Lisp_Object arg1, Lisp_Object arg2) |
2e471eb5 GM |
2798 | { |
2799 | return Fcons (arg1, Fcons (arg2, Qnil)); | |
2800 | } | |
2801 | ||
34400008 | 2802 | |
2e471eb5 | 2803 | Lisp_Object |
971de7fb | 2804 | list3 (Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
2e471eb5 GM |
2805 | { |
2806 | return Fcons (arg1, Fcons (arg2, Fcons (arg3, Qnil))); | |
2807 | } | |
2808 | ||
34400008 | 2809 | |
2e471eb5 | 2810 | Lisp_Object |
971de7fb | 2811 | list4 (Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, Lisp_Object arg4) |
2e471eb5 GM |
2812 | { |
2813 | return Fcons (arg1, Fcons (arg2, Fcons (arg3, Fcons (arg4, Qnil)))); | |
2814 | } | |
2815 | ||
34400008 | 2816 | |
2e471eb5 | 2817 | Lisp_Object |
971de7fb | 2818 | list5 (Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, Lisp_Object arg4, Lisp_Object arg5) |
2e471eb5 GM |
2819 | { |
2820 | return Fcons (arg1, Fcons (arg2, Fcons (arg3, Fcons (arg4, | |
2821 | Fcons (arg5, Qnil))))); | |
2822 | } | |
2823 | ||
34400008 | 2824 | |
a7ca3326 | 2825 | DEFUN ("list", Flist, Slist, 0, MANY, 0, |
eae936e2 | 2826 | doc: /* Return a newly created list with specified arguments as elements. |
ae8e8122 MB |
2827 | Any number of arguments, even zero arguments, are allowed. |
2828 | usage: (list &rest OBJECTS) */) | |
f66c7cf8 | 2829 | (ptrdiff_t nargs, Lisp_Object *args) |
2e471eb5 GM |
2830 | { |
2831 | register Lisp_Object val; | |
2832 | val = Qnil; | |
2833 | ||
2834 | while (nargs > 0) | |
2835 | { | |
2836 | nargs--; | |
2837 | val = Fcons (args[nargs], val); | |
2838 | } | |
2839 | return val; | |
2840 | } | |
2841 | ||
34400008 | 2842 | |
a7ca3326 | 2843 | DEFUN ("make-list", Fmake_list, Smake_list, 2, 2, 0, |
a6266d23 | 2844 | doc: /* Return a newly created list of length LENGTH, with each element being INIT. */) |
5842a27b | 2845 | (register Lisp_Object length, Lisp_Object init) |
2e471eb5 GM |
2846 | { |
2847 | register Lisp_Object val; | |
14162469 | 2848 | register EMACS_INT size; |
2e471eb5 | 2849 | |
b7826503 | 2850 | CHECK_NATNUM (length); |
2e471eb5 GM |
2851 | size = XFASTINT (length); |
2852 | ||
2853 | val = Qnil; | |
ce070307 GM |
2854 | while (size > 0) |
2855 | { | |
2856 | val = Fcons (init, val); | |
2857 | --size; | |
2858 | ||
2859 | if (size > 0) | |
2860 | { | |
2861 | val = Fcons (init, val); | |
2862 | --size; | |
177c0ea7 | 2863 | |
ce070307 GM |
2864 | if (size > 0) |
2865 | { | |
2866 | val = Fcons (init, val); | |
2867 | --size; | |
177c0ea7 | 2868 | |
ce070307 GM |
2869 | if (size > 0) |
2870 | { | |
2871 | val = Fcons (init, val); | |
2872 | --size; | |
177c0ea7 | 2873 | |
ce070307 GM |
2874 | if (size > 0) |
2875 | { | |
2876 | val = Fcons (init, val); | |
2877 | --size; | |
2878 | } | |
2879 | } | |
2880 | } | |
2881 | } | |
2882 | ||
2883 | QUIT; | |
2884 | } | |
177c0ea7 | 2885 | |
7146af97 JB |
2886 | return val; |
2887 | } | |
2e471eb5 GM |
2888 | |
2889 | ||
7146af97 | 2890 | \f |
2e471eb5 GM |
2891 | /*********************************************************************** |
2892 | Vector Allocation | |
2893 | ***********************************************************************/ | |
7146af97 | 2894 | |
f3372c87 DA |
2895 | /* This value is balanced well enough to avoid too much internal overhead |
2896 | for the most common cases; it's not required to be a power of two, but | |
2897 | it's expected to be a mult-of-ROUNDUP_SIZE (see below). */ | |
34400008 | 2898 | |
f3372c87 | 2899 | #define VECTOR_BLOCK_SIZE 4096 |
7146af97 | 2900 | |
dd0b0efb PE |
2901 | /* Handy constants for vectorlike objects. */ |
2902 | enum | |
2903 | { | |
2904 | header_size = offsetof (struct Lisp_Vector, contents), | |
f3372c87 DA |
2905 | word_size = sizeof (Lisp_Object), |
2906 | roundup_size = COMMON_MULTIPLE (sizeof (Lisp_Object), | |
bfe3e0a2 | 2907 | USE_LSB_TAG ? 1 << GCTYPEBITS : 1) |
dd0b0efb | 2908 | }; |
34400008 | 2909 | |
bfe3e0a2 PE |
2910 | /* ROUNDUP_SIZE must be a power of 2. */ |
2911 | verify ((roundup_size & (roundup_size - 1)) == 0); | |
2912 | ||
2913 | /* Round up X to nearest mult-of-ROUNDUP_SIZE. */ | |
f3372c87 DA |
2914 | |
2915 | #define vroundup(x) (((x) + (roundup_size - 1)) & ~(roundup_size - 1)) | |
2916 | ||
2917 | /* Rounding helps to maintain alignment constraints if USE_LSB_TAG. */ | |
2918 | ||
2919 | #define VECTOR_BLOCK_BYTES (VECTOR_BLOCK_SIZE - vroundup (sizeof (void *))) | |
2920 | ||
2921 | /* Size of the minimal vector allocated from block. */ | |
2922 | ||
2923 | #define VBLOCK_BYTES_MIN vroundup (sizeof (struct Lisp_Vector)) | |
2924 | ||
2925 | /* Size of the largest vector allocated from block. */ | |
2926 | ||
2927 | #define VBLOCK_BYTES_MAX \ | |
2928 | vroundup ((VECTOR_BLOCK_BYTES / 2) - sizeof (Lisp_Object)) | |
2929 | ||
2930 | /* We maintain one free list for each possible block-allocated | |
2931 | vector size, and this is the number of free lists we have. */ | |
2932 | ||
2933 | #define VECTOR_MAX_FREE_LIST_INDEX \ | |
2934 | ((VECTOR_BLOCK_BYTES - VBLOCK_BYTES_MIN) / roundup_size + 1) | |
2935 | ||
2936 | /* When the vector is on a free list, vectorlike_header.SIZE is set to | |
2937 | this special value ORed with vector's memory footprint size. */ | |
2938 | ||
2939 | #define VECTOR_FREE_LIST_FLAG (~(ARRAY_MARK_FLAG | PSEUDOVECTOR_FLAG \ | |
2940 | | (VECTOR_BLOCK_SIZE - 1))) | |
2941 | ||
2942 | /* Common shortcut to advance vector pointer over a block data. */ | |
2943 | ||
2944 | #define ADVANCE(v, nbytes) ((struct Lisp_Vector *) ((char *) (v) + (nbytes))) | |
2945 | ||
2946 | /* Common shortcut to calculate NBYTES-vector index in VECTOR_FREE_LISTS. */ | |
2947 | ||
2948 | #define VINDEX(nbytes) (((nbytes) - VBLOCK_BYTES_MIN) / roundup_size) | |
2949 | ||
2950 | /* Common shortcut to setup vector on a free list. */ | |
2951 | ||
2952 | #define SETUP_ON_FREE_LIST(v, nbytes, index) \ | |
2953 | do { \ | |
2954 | (v)->header.size = VECTOR_FREE_LIST_FLAG | (nbytes); \ | |
2955 | eassert ((nbytes) % roundup_size == 0); \ | |
2956 | (index) = VINDEX (nbytes); \ | |
2957 | eassert ((index) < VECTOR_MAX_FREE_LIST_INDEX); \ | |
2958 | (v)->header.next.vector = vector_free_lists[index]; \ | |
2959 | vector_free_lists[index] = (v); \ | |
2960 | } while (0) | |
2961 | ||
2962 | struct vector_block | |
2963 | { | |
2964 | char data[VECTOR_BLOCK_BYTES]; | |
2965 | struct vector_block *next; | |
2966 | }; | |
2967 | ||
2968 | /* Chain of vector blocks. */ | |
2969 | ||
2970 | static struct vector_block *vector_blocks; | |
2971 | ||
2972 | /* Vector free lists, where NTH item points to a chain of free | |
2973 | vectors of the same NBYTES size, so NTH == VINDEX (NBYTES). */ | |
2974 | ||
2975 | static struct Lisp_Vector *vector_free_lists[VECTOR_MAX_FREE_LIST_INDEX]; | |
2976 | ||
2977 | /* Singly-linked list of large vectors. */ | |
2978 | ||
2979 | static struct Lisp_Vector *large_vectors; | |
2980 | ||
2981 | /* The only vector with 0 slots, allocated from pure space. */ | |
2982 | ||
2983 | static struct Lisp_Vector *zero_vector; | |
2984 | ||
2985 | /* Get a new vector block. */ | |
2986 | ||
2987 | static struct vector_block * | |
2988 | allocate_vector_block (void) | |
2989 | { | |
2990 | struct vector_block *block; | |
2991 | ||
2992 | #ifdef DOUG_LEA_MALLOC | |
2993 | mallopt (M_MMAP_MAX, 0); | |
2994 | #endif | |
2995 | ||
2996 | block = xmalloc (sizeof (struct vector_block)); | |
2997 | ||
2998 | #ifdef DOUG_LEA_MALLOC | |
2999 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); | |
3000 | #endif | |
3001 | ||
3002 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK | |
3003 | mem_insert (block->data, block->data + VECTOR_BLOCK_BYTES, | |
3004 | MEM_TYPE_VECTOR_BLOCK); | |
3005 | #endif | |
3006 | ||
3007 | block->next = vector_blocks; | |
3008 | vector_blocks = block; | |
3009 | return block; | |
3010 | } | |
3011 | ||
3012 | /* Called once to initialize vector allocation. */ | |
3013 | ||
3014 | static void | |
3015 | init_vectors (void) | |
3016 | { | |
3017 | zero_vector = pure_alloc (header_size, Lisp_Vectorlike); | |
3018 | zero_vector->header.size = 0; | |
3019 | } | |
3020 | ||
3021 | /* Allocate vector from a vector block. */ | |
3022 | ||
3023 | static struct Lisp_Vector * | |
3024 | allocate_vector_from_block (size_t nbytes) | |
3025 | { | |
3026 | struct Lisp_Vector *vector, *rest; | |
3027 | struct vector_block *block; | |
3028 | size_t index, restbytes; | |
3029 | ||
3030 | eassert (VBLOCK_BYTES_MIN <= nbytes && nbytes <= VBLOCK_BYTES_MAX); | |
3031 | eassert (nbytes % roundup_size == 0); | |
3032 | ||
3033 | /* First, try to allocate from a free list | |
3034 | containing vectors of the requested size. */ | |
3035 | index = VINDEX (nbytes); | |
3036 | if (vector_free_lists[index]) | |
3037 | { | |
3038 | vector = vector_free_lists[index]; | |
3039 | vector_free_lists[index] = vector->header.next.vector; | |
3040 | vector->header.next.nbytes = nbytes; | |
3041 | return vector; | |
3042 | } | |
3043 | ||
3044 | /* Next, check free lists containing larger vectors. Since | |
3045 | we will split the result, we should have remaining space | |
3046 | large enough to use for one-slot vector at least. */ | |
3047 | for (index = VINDEX (nbytes + VBLOCK_BYTES_MIN); | |
3048 | index < VECTOR_MAX_FREE_LIST_INDEX; index++) | |
3049 | if (vector_free_lists[index]) | |
3050 | { | |
3051 | /* This vector is larger than requested. */ | |
3052 | vector = vector_free_lists[index]; | |
3053 | vector_free_lists[index] = vector->header.next.vector; | |
3054 | vector->header.next.nbytes = nbytes; | |
3055 | ||
3056 | /* Excess bytes are used for the smaller vector, | |
3057 | which should be set on an appropriate free list. */ | |
3058 | restbytes = index * roundup_size + VBLOCK_BYTES_MIN - nbytes; | |
3059 | eassert (restbytes % roundup_size == 0); | |
3060 | rest = ADVANCE (vector, nbytes); | |
3061 | SETUP_ON_FREE_LIST (rest, restbytes, index); | |
3062 | return vector; | |
3063 | } | |
3064 | ||
3065 | /* Finally, need a new vector block. */ | |
3066 | block = allocate_vector_block (); | |
3067 | ||
3068 | /* New vector will be at the beginning of this block. */ | |
3069 | vector = (struct Lisp_Vector *) block->data; | |
3070 | vector->header.next.nbytes = nbytes; | |
3071 | ||
3072 | /* If the rest of space from this block is large enough | |
3073 | for one-slot vector at least, set up it on a free list. */ | |
3074 | restbytes = VECTOR_BLOCK_BYTES - nbytes; | |
3075 | if (restbytes >= VBLOCK_BYTES_MIN) | |
3076 | { | |
3077 | eassert (restbytes % roundup_size == 0); | |
3078 | rest = ADVANCE (vector, nbytes); | |
3079 | SETUP_ON_FREE_LIST (rest, restbytes, index); | |
3080 | } | |
3081 | return vector; | |
3082 | } | |
3083 | ||
3084 | /* Return how many Lisp_Objects can be stored in V. */ | |
3085 | ||
3086 | #define VECTOR_SIZE(v) ((v)->header.size & PSEUDOVECTOR_FLAG ? \ | |
3087 | (PSEUDOVECTOR_SIZE_MASK & (v)->header.size) : \ | |
3088 | (v)->header.size) | |
3089 | ||
3090 | /* Nonzero if VECTOR pointer is valid pointer inside BLOCK. */ | |
3091 | ||
3092 | #define VECTOR_IN_BLOCK(vector, block) \ | |
3093 | ((char *) (vector) <= (block)->data \ | |
3094 | + VECTOR_BLOCK_BYTES - VBLOCK_BYTES_MIN) | |
3095 | ||
3096 | /* Reclaim space used by unmarked vectors. */ | |
3097 | ||
3098 | static void | |
3099 | sweep_vectors (void) | |
3100 | { | |
3101 | struct vector_block *block = vector_blocks, **bprev = &vector_blocks; | |
3102 | struct Lisp_Vector *vector, *next, **vprev = &large_vectors; | |
3103 | ||
3104 | total_vector_size = 0; | |
3105 | memset (vector_free_lists, 0, sizeof (vector_free_lists)); | |
3106 | ||
3107 | /* Looking through vector blocks. */ | |
3108 | ||
3109 | for (block = vector_blocks; block; block = *bprev) | |
3110 | { | |
3111 | int free_this_block = 0; | |
3112 | ||
3113 | for (vector = (struct Lisp_Vector *) block->data; | |
3114 | VECTOR_IN_BLOCK (vector, block); vector = next) | |
3115 | { | |
3116 | if (VECTOR_MARKED_P (vector)) | |
3117 | { | |
3118 | VECTOR_UNMARK (vector); | |
3119 | total_vector_size += VECTOR_SIZE (vector); | |
3120 | next = ADVANCE (vector, vector->header.next.nbytes); | |
3121 | } | |
3122 | else | |
3123 | { | |
3124 | ptrdiff_t nbytes; | |
3125 | ||
3126 | if ((vector->header.size & VECTOR_FREE_LIST_FLAG) | |
3127 | == VECTOR_FREE_LIST_FLAG) | |
3128 | vector->header.next.nbytes = | |
3129 | vector->header.size & (VECTOR_BLOCK_SIZE - 1); | |
bfe3e0a2 | 3130 | |
f3372c87 DA |
3131 | next = ADVANCE (vector, vector->header.next.nbytes); |
3132 | ||
3133 | /* While NEXT is not marked, try to coalesce with VECTOR, | |
3134 | thus making VECTOR of the largest possible size. */ | |
3135 | ||
3136 | while (VECTOR_IN_BLOCK (next, block)) | |
3137 | { | |
3138 | if (VECTOR_MARKED_P (next)) | |
3139 | break; | |
3140 | if ((next->header.size & VECTOR_FREE_LIST_FLAG) | |
3141 | == VECTOR_FREE_LIST_FLAG) | |
3142 | nbytes = next->header.size & (VECTOR_BLOCK_SIZE - 1); | |
3143 | else | |
3144 | nbytes = next->header.next.nbytes; | |
3145 | vector->header.next.nbytes += nbytes; | |
3146 | next = ADVANCE (next, nbytes); | |
3147 | } | |
bfe3e0a2 | 3148 | |
f3372c87 DA |
3149 | eassert (vector->header.next.nbytes % roundup_size == 0); |
3150 | ||
3151 | if (vector == (struct Lisp_Vector *) block->data | |
3152 | && !VECTOR_IN_BLOCK (next, block)) | |
3153 | /* This block should be freed because all of it's | |
3154 | space was coalesced into the only free vector. */ | |
3155 | free_this_block = 1; | |
3156 | else | |
3157 | SETUP_ON_FREE_LIST (vector, vector->header.next.nbytes, nbytes); | |
3158 | } | |
3159 | } | |
3160 | ||
3161 | if (free_this_block) | |
3162 | { | |
3163 | *bprev = block->next; | |
3164 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK | |
3165 | mem_delete (mem_find (block->data)); | |
3166 | #endif | |
3167 | xfree (block); | |
3168 | } | |
3169 | else | |
3170 | bprev = &block->next; | |
3171 | } | |
3172 | ||
3173 | /* Sweep large vectors. */ | |
3174 | ||
3175 | for (vector = large_vectors; vector; vector = *vprev) | |
3176 | { | |
3177 | if (VECTOR_MARKED_P (vector)) | |
3178 | { | |
3179 | VECTOR_UNMARK (vector); | |
3180 | total_vector_size += VECTOR_SIZE (vector); | |
3181 | vprev = &vector->header.next.vector; | |
3182 | } | |
3183 | else | |
3184 | { | |
3185 | *vprev = vector->header.next.vector; | |
3186 | lisp_free (vector); | |
3187 | } | |
3188 | } | |
3189 | } | |
3190 | ||
34400008 GM |
3191 | /* Value is a pointer to a newly allocated Lisp_Vector structure |
3192 | with room for LEN Lisp_Objects. */ | |
3193 | ||
ece93c02 | 3194 | static struct Lisp_Vector * |
d311d28c | 3195 | allocate_vectorlike (ptrdiff_t len) |
1825c68d KH |
3196 | { |
3197 | struct Lisp_Vector *p; | |
675d5130 | 3198 | size_t nbytes; |
1825c68d | 3199 | |
dafc79fa SM |
3200 | MALLOC_BLOCK_INPUT; |
3201 | ||
d1658221 | 3202 | #ifdef DOUG_LEA_MALLOC |
f8608968 GM |
3203 | /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed |
3204 | because mapped region contents are not preserved in | |
3205 | a dumped Emacs. */ | |
d1658221 RS |
3206 | mallopt (M_MMAP_MAX, 0); |
3207 | #endif | |
177c0ea7 | 3208 | |
cfb2f32e SM |
3209 | /* This gets triggered by code which I haven't bothered to fix. --Stef */ |
3210 | /* eassert (!handling_signal); */ | |
3211 | ||
f3372c87 | 3212 | if (len == 0) |
8bbbc977 EZ |
3213 | { |
3214 | MALLOC_UNBLOCK_INPUT; | |
3215 | return zero_vector; | |
3216 | } | |
f3372c87 | 3217 | |
0de4bb68 | 3218 | nbytes = header_size + len * word_size; |
f3372c87 DA |
3219 | |
3220 | if (nbytes <= VBLOCK_BYTES_MAX) | |
3221 | p = allocate_vector_from_block (vroundup (nbytes)); | |
3222 | else | |
3223 | { | |
3224 | p = (struct Lisp_Vector *) lisp_malloc (nbytes, MEM_TYPE_VECTORLIKE); | |
3225 | p->header.next.vector = large_vectors; | |
3226 | large_vectors = p; | |
3227 | } | |
177c0ea7 | 3228 | |
d1658221 | 3229 | #ifdef DOUG_LEA_MALLOC |
34400008 | 3230 | /* Back to a reasonable maximum of mmap'ed areas. */ |
81d492d5 | 3231 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); |
d1658221 | 3232 | #endif |
177c0ea7 | 3233 | |
34400008 | 3234 | consing_since_gc += nbytes; |
310ea200 | 3235 | vector_cells_consed += len; |
1825c68d | 3236 | |
dafc79fa | 3237 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 3238 | |
1825c68d KH |
3239 | return p; |
3240 | } | |
3241 | ||
34400008 | 3242 | |
dd0b0efb | 3243 | /* Allocate a vector with LEN slots. */ |
ece93c02 GM |
3244 | |
3245 | struct Lisp_Vector * | |
dd0b0efb | 3246 | allocate_vector (EMACS_INT len) |
ece93c02 | 3247 | { |
dd0b0efb PE |
3248 | struct Lisp_Vector *v; |
3249 | ptrdiff_t nbytes_max = min (PTRDIFF_MAX, SIZE_MAX); | |
3250 | ||
3251 | if (min ((nbytes_max - header_size) / word_size, MOST_POSITIVE_FIXNUM) < len) | |
3252 | memory_full (SIZE_MAX); | |
3253 | v = allocate_vectorlike (len); | |
3254 | v->header.size = len; | |
ece93c02 GM |
3255 | return v; |
3256 | } | |
3257 | ||
3258 | ||
3259 | /* Allocate other vector-like structures. */ | |
3260 | ||
30f95089 | 3261 | struct Lisp_Vector * |
d311d28c | 3262 | allocate_pseudovector (int memlen, int lisplen, int tag) |
ece93c02 | 3263 | { |
d2029e5b | 3264 | struct Lisp_Vector *v = allocate_vectorlike (memlen); |
e46bb31a | 3265 | int i; |
177c0ea7 | 3266 | |
d2029e5b | 3267 | /* Only the first lisplen slots will be traced normally by the GC. */ |
d2029e5b | 3268 | for (i = 0; i < lisplen; ++i) |
ece93c02 | 3269 | v->contents[i] = Qnil; |
177c0ea7 | 3270 | |
eab3844f | 3271 | XSETPVECTYPESIZE (v, tag, lisplen); |
d2029e5b SM |
3272 | return v; |
3273 | } | |
d2029e5b | 3274 | |
ece93c02 | 3275 | struct Lisp_Hash_Table * |
878f97ff | 3276 | allocate_hash_table (void) |
ece93c02 | 3277 | { |
878f97ff | 3278 | return ALLOCATE_PSEUDOVECTOR (struct Lisp_Hash_Table, count, PVEC_HASH_TABLE); |
ece93c02 GM |
3279 | } |
3280 | ||
3281 | ||
3282 | struct window * | |
971de7fb | 3283 | allocate_window (void) |
ece93c02 | 3284 | { |
5e617bc2 | 3285 | return ALLOCATE_PSEUDOVECTOR (struct window, current_matrix, PVEC_WINDOW); |
ece93c02 | 3286 | } |
177c0ea7 | 3287 | |
177c0ea7 | 3288 | |
4a729fd8 | 3289 | struct terminal * |
971de7fb | 3290 | allocate_terminal (void) |
4a729fd8 | 3291 | { |
d2029e5b SM |
3292 | struct terminal *t = ALLOCATE_PSEUDOVECTOR (struct terminal, |
3293 | next_terminal, PVEC_TERMINAL); | |
3294 | /* Zero out the non-GC'd fields. FIXME: This should be made unnecessary. */ | |
72af86bd AS |
3295 | memset (&t->next_terminal, 0, |
3296 | (char*) (t + 1) - (char*) &t->next_terminal); | |
ece93c02 | 3297 | |
d2029e5b | 3298 | return t; |
4a729fd8 | 3299 | } |
ece93c02 GM |
3300 | |
3301 | struct frame * | |
971de7fb | 3302 | allocate_frame (void) |
ece93c02 | 3303 | { |
d2029e5b SM |
3304 | struct frame *f = ALLOCATE_PSEUDOVECTOR (struct frame, |
3305 | face_cache, PVEC_FRAME); | |
3306 | /* Zero out the non-GC'd fields. FIXME: This should be made unnecessary. */ | |
72af86bd AS |
3307 | memset (&f->face_cache, 0, |
3308 | (char *) (f + 1) - (char *) &f->face_cache); | |
d2029e5b | 3309 | return f; |
ece93c02 GM |
3310 | } |
3311 | ||
3312 | ||
3313 | struct Lisp_Process * | |
971de7fb | 3314 | allocate_process (void) |
ece93c02 | 3315 | { |
d2029e5b | 3316 | return ALLOCATE_PSEUDOVECTOR (struct Lisp_Process, pid, PVEC_PROCESS); |
ece93c02 GM |
3317 | } |
3318 | ||
3319 | ||
a7ca3326 | 3320 | DEFUN ("make-vector", Fmake_vector, Smake_vector, 2, 2, 0, |
a6266d23 | 3321 | doc: /* Return a newly created vector of length LENGTH, with each element being INIT. |
7ee72033 | 3322 | See also the function `vector'. */) |
5842a27b | 3323 | (register Lisp_Object length, Lisp_Object init) |
7146af97 | 3324 | { |
1825c68d | 3325 | Lisp_Object vector; |
d311d28c PE |
3326 | register ptrdiff_t sizei; |
3327 | register ptrdiff_t i; | |
7146af97 JB |
3328 | register struct Lisp_Vector *p; |
3329 | ||
b7826503 | 3330 | CHECK_NATNUM (length); |
7146af97 | 3331 | |
d311d28c PE |
3332 | p = allocate_vector (XFASTINT (length)); |
3333 | sizei = XFASTINT (length); | |
ae35e756 PE |
3334 | for (i = 0; i < sizei; i++) |
3335 | p->contents[i] = init; | |
7146af97 | 3336 | |
1825c68d | 3337 | XSETVECTOR (vector, p); |
7146af97 JB |
3338 | return vector; |
3339 | } | |
3340 | ||
34400008 | 3341 | |
a7ca3326 | 3342 | DEFUN ("vector", Fvector, Svector, 0, MANY, 0, |
eae936e2 | 3343 | doc: /* Return a newly created vector with specified arguments as elements. |
ae8e8122 MB |
3344 | Any number of arguments, even zero arguments, are allowed. |
3345 | usage: (vector &rest OBJECTS) */) | |
f66c7cf8 | 3346 | (ptrdiff_t nargs, Lisp_Object *args) |
7146af97 JB |
3347 | { |
3348 | register Lisp_Object len, val; | |
f66c7cf8 | 3349 | ptrdiff_t i; |
7146af97 JB |
3350 | register struct Lisp_Vector *p; |
3351 | ||
67ba9986 | 3352 | XSETFASTINT (len, nargs); |
7146af97 JB |
3353 | val = Fmake_vector (len, Qnil); |
3354 | p = XVECTOR (val); | |
ae35e756 PE |
3355 | for (i = 0; i < nargs; i++) |
3356 | p->contents[i] = args[i]; | |
7146af97 JB |
3357 | return val; |
3358 | } | |
3359 | ||
3017f87f SM |
3360 | void |
3361 | make_byte_code (struct Lisp_Vector *v) | |
3362 | { | |
3363 | if (v->header.size > 1 && STRINGP (v->contents[1]) | |
3364 | && STRING_MULTIBYTE (v->contents[1])) | |
3365 | /* BYTECODE-STRING must have been produced by Emacs 20.2 or the | |
3366 | earlier because they produced a raw 8-bit string for byte-code | |
3367 | and now such a byte-code string is loaded as multibyte while | |
3368 | raw 8-bit characters converted to multibyte form. Thus, now we | |
3369 | must convert them back to the original unibyte form. */ | |
3370 | v->contents[1] = Fstring_as_unibyte (v->contents[1]); | |
3371 | XSETPVECTYPE (v, PVEC_COMPILED); | |
3372 | } | |
34400008 | 3373 | |
a7ca3326 | 3374 | DEFUN ("make-byte-code", Fmake_byte_code, Smake_byte_code, 4, MANY, 0, |
a6266d23 | 3375 | doc: /* Create a byte-code object with specified arguments as elements. |
e2abe5a1 SM |
3376 | The arguments should be the ARGLIST, bytecode-string BYTE-CODE, constant |
3377 | vector CONSTANTS, maximum stack size DEPTH, (optional) DOCSTRING, | |
3378 | and (optional) INTERACTIVE-SPEC. | |
228299fa | 3379 | The first four arguments are required; at most six have any |
ae8e8122 | 3380 | significance. |
e2abe5a1 SM |
3381 | The ARGLIST can be either like the one of `lambda', in which case the arguments |
3382 | will be dynamically bound before executing the byte code, or it can be an | |
3383 | integer of the form NNNNNNNRMMMMMMM where the 7bit MMMMMMM specifies the | |
3384 | minimum number of arguments, the 7-bit NNNNNNN specifies the maximum number | |
3385 | of arguments (ignoring &rest) and the R bit specifies whether there is a &rest | |
3386 | argument to catch the left-over arguments. If such an integer is used, the | |
3387 | arguments will not be dynamically bound but will be instead pushed on the | |
3388 | stack before executing the byte-code. | |
92cc28b2 | 3389 | usage: (make-byte-code ARGLIST BYTE-CODE CONSTANTS DEPTH &optional DOCSTRING INTERACTIVE-SPEC &rest ELEMENTS) */) |
f66c7cf8 | 3390 | (ptrdiff_t nargs, Lisp_Object *args) |
7146af97 JB |
3391 | { |
3392 | register Lisp_Object len, val; | |
f66c7cf8 | 3393 | ptrdiff_t i; |
7146af97 JB |
3394 | register struct Lisp_Vector *p; |
3395 | ||
3017f87f SM |
3396 | /* We used to purecopy everything here, if purify-flga was set. This worked |
3397 | OK for Emacs-23, but with Emacs-24's lexical binding code, it can be | |
3398 | dangerous, since make-byte-code is used during execution to build | |
3399 | closures, so any closure built during the preload phase would end up | |
3400 | copied into pure space, including its free variables, which is sometimes | |
3401 | just wasteful and other times plainly wrong (e.g. those free vars may want | |
3402 | to be setcar'd). */ | |
9eac9d59 | 3403 | |
3017f87f SM |
3404 | XSETFASTINT (len, nargs); |
3405 | val = Fmake_vector (len, Qnil); | |
9eac9d59 | 3406 | |
7146af97 | 3407 | p = XVECTOR (val); |
ae35e756 | 3408 | for (i = 0; i < nargs; i++) |
3017f87f SM |
3409 | p->contents[i] = args[i]; |
3410 | make_byte_code (p); | |
876c194c | 3411 | XSETCOMPILED (val, p); |
7146af97 JB |
3412 | return val; |
3413 | } | |
2e471eb5 | 3414 | |
34400008 | 3415 | |
7146af97 | 3416 | \f |
2e471eb5 GM |
3417 | /*********************************************************************** |
3418 | Symbol Allocation | |
3419 | ***********************************************************************/ | |
7146af97 | 3420 | |
d55c12ed AS |
3421 | /* Like struct Lisp_Symbol, but padded so that the size is a multiple |
3422 | of the required alignment if LSB tags are used. */ | |
3423 | ||
3424 | union aligned_Lisp_Symbol | |
3425 | { | |
3426 | struct Lisp_Symbol s; | |
bfe3e0a2 | 3427 | #if USE_LSB_TAG |
d55c12ed AS |
3428 | unsigned char c[(sizeof (struct Lisp_Symbol) + (1 << GCTYPEBITS) - 1) |
3429 | & -(1 << GCTYPEBITS)]; | |
3430 | #endif | |
3431 | }; | |
3432 | ||
2e471eb5 GM |
3433 | /* Each symbol_block is just under 1020 bytes long, since malloc |
3434 | really allocates in units of powers of two and uses 4 bytes for its | |
3017f87f | 3435 | own overhead. */ |
7146af97 JB |
3436 | |
3437 | #define SYMBOL_BLOCK_SIZE \ | |
d55c12ed | 3438 | ((1020 - sizeof (struct symbol_block *)) / sizeof (union aligned_Lisp_Symbol)) |
7146af97 JB |
3439 | |
3440 | struct symbol_block | |
2e471eb5 | 3441 | { |
6b61353c | 3442 | /* Place `symbols' first, to preserve alignment. */ |
d55c12ed | 3443 | union aligned_Lisp_Symbol symbols[SYMBOL_BLOCK_SIZE]; |
6b61353c | 3444 | struct symbol_block *next; |
2e471eb5 | 3445 | }; |
7146af97 | 3446 | |
34400008 GM |
3447 | /* Current symbol block and index of first unused Lisp_Symbol |
3448 | structure in it. */ | |
3449 | ||
d3d47262 JB |
3450 | static struct symbol_block *symbol_block; |
3451 | static int symbol_block_index; | |
7146af97 | 3452 | |
34400008 GM |
3453 | /* List of free symbols. */ |
3454 | ||
d3d47262 | 3455 | static struct Lisp_Symbol *symbol_free_list; |
7146af97 | 3456 | |
34400008 GM |
3457 | |
3458 | /* Initialize symbol allocation. */ | |
3459 | ||
d3d47262 | 3460 | static void |
971de7fb | 3461 | init_symbol (void) |
7146af97 | 3462 | { |
005ca5c7 DL |
3463 | symbol_block = NULL; |
3464 | symbol_block_index = SYMBOL_BLOCK_SIZE; | |
7146af97 JB |
3465 | symbol_free_list = 0; |
3466 | } | |
3467 | ||
34400008 | 3468 | |
a7ca3326 | 3469 | DEFUN ("make-symbol", Fmake_symbol, Smake_symbol, 1, 1, 0, |
a6266d23 | 3470 | doc: /* Return a newly allocated uninterned symbol whose name is NAME. |
7ee72033 | 3471 | Its value and function definition are void, and its property list is nil. */) |
5842a27b | 3472 | (Lisp_Object name) |
7146af97 JB |
3473 | { |
3474 | register Lisp_Object val; | |
3475 | register struct Lisp_Symbol *p; | |
3476 | ||
b7826503 | 3477 | CHECK_STRING (name); |
7146af97 | 3478 | |
537407f0 | 3479 | /* eassert (!handling_signal); */ |
cfb2f32e | 3480 | |
dafc79fa | 3481 | MALLOC_BLOCK_INPUT; |
e2984df0 | 3482 | |
7146af97 JB |
3483 | if (symbol_free_list) |
3484 | { | |
45d12a89 | 3485 | XSETSYMBOL (val, symbol_free_list); |
28a099a4 | 3486 | symbol_free_list = symbol_free_list->next; |
7146af97 JB |
3487 | } |
3488 | else | |
3489 | { | |
3490 | if (symbol_block_index == SYMBOL_BLOCK_SIZE) | |
3491 | { | |
3c06d205 | 3492 | struct symbol_block *new; |
34400008 GM |
3493 | new = (struct symbol_block *) lisp_malloc (sizeof *new, |
3494 | MEM_TYPE_SYMBOL); | |
7146af97 JB |
3495 | new->next = symbol_block; |
3496 | symbol_block = new; | |
3497 | symbol_block_index = 0; | |
3498 | } | |
d55c12ed | 3499 | XSETSYMBOL (val, &symbol_block->symbols[symbol_block_index].s); |
6b61353c | 3500 | symbol_block_index++; |
7146af97 | 3501 | } |
177c0ea7 | 3502 | |
dafc79fa | 3503 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 3504 | |
7146af97 | 3505 | p = XSYMBOL (val); |
8fe5665d | 3506 | p->xname = name; |
7146af97 | 3507 | p->plist = Qnil; |
ce5b453a SM |
3508 | p->redirect = SYMBOL_PLAINVAL; |
3509 | SET_SYMBOL_VAL (p, Qunbound); | |
2e471eb5 | 3510 | p->function = Qunbound; |
9e713715 | 3511 | p->next = NULL; |
2336fe58 | 3512 | p->gcmarkbit = 0; |
9e713715 GM |
3513 | p->interned = SYMBOL_UNINTERNED; |
3514 | p->constant = 0; | |
b9598260 | 3515 | p->declared_special = 0; |
2e471eb5 GM |
3516 | consing_since_gc += sizeof (struct Lisp_Symbol); |
3517 | symbols_consed++; | |
7146af97 JB |
3518 | return val; |
3519 | } | |
3520 | ||
3f25e183 | 3521 | |
2e471eb5 GM |
3522 | \f |
3523 | /*********************************************************************** | |
34400008 | 3524 | Marker (Misc) Allocation |
2e471eb5 | 3525 | ***********************************************************************/ |
3f25e183 | 3526 | |
d55c12ed AS |
3527 | /* Like union Lisp_Misc, but padded so that its size is a multiple of |
3528 | the required alignment when LSB tags are used. */ | |
3529 | ||
3530 | union aligned_Lisp_Misc | |
3531 | { | |
3532 | union Lisp_Misc m; | |
bfe3e0a2 | 3533 | #if USE_LSB_TAG |
d55c12ed AS |
3534 | unsigned char c[(sizeof (union Lisp_Misc) + (1 << GCTYPEBITS) - 1) |
3535 | & -(1 << GCTYPEBITS)]; | |
3536 | #endif | |
3537 | }; | |
3538 | ||
2e471eb5 GM |
3539 | /* Allocation of markers and other objects that share that structure. |
3540 | Works like allocation of conses. */ | |
c0696668 | 3541 | |
2e471eb5 | 3542 | #define MARKER_BLOCK_SIZE \ |
d55c12ed | 3543 | ((1020 - sizeof (struct marker_block *)) / sizeof (union aligned_Lisp_Misc)) |
2e471eb5 GM |
3544 | |
3545 | struct marker_block | |
c0696668 | 3546 | { |
6b61353c | 3547 | /* Place `markers' first, to preserve alignment. */ |
d55c12ed | 3548 | union aligned_Lisp_Misc markers[MARKER_BLOCK_SIZE]; |
6b61353c | 3549 | struct marker_block *next; |
2e471eb5 | 3550 | }; |
c0696668 | 3551 | |
d3d47262 JB |
3552 | static struct marker_block *marker_block; |
3553 | static int marker_block_index; | |
c0696668 | 3554 | |
d3d47262 | 3555 | static union Lisp_Misc *marker_free_list; |
c0696668 | 3556 | |
d3d47262 | 3557 | static void |
971de7fb | 3558 | init_marker (void) |
3f25e183 | 3559 | { |
005ca5c7 DL |
3560 | marker_block = NULL; |
3561 | marker_block_index = MARKER_BLOCK_SIZE; | |
2e471eb5 | 3562 | marker_free_list = 0; |
3f25e183 RS |
3563 | } |
3564 | ||
2e471eb5 GM |
3565 | /* Return a newly allocated Lisp_Misc object, with no substructure. */ |
3566 | ||
3f25e183 | 3567 | Lisp_Object |
971de7fb | 3568 | allocate_misc (void) |
7146af97 | 3569 | { |
2e471eb5 | 3570 | Lisp_Object val; |
7146af97 | 3571 | |
e2984df0 CY |
3572 | /* eassert (!handling_signal); */ |
3573 | ||
dafc79fa | 3574 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 3575 | |
2e471eb5 | 3576 | if (marker_free_list) |
7146af97 | 3577 | { |
2e471eb5 GM |
3578 | XSETMISC (val, marker_free_list); |
3579 | marker_free_list = marker_free_list->u_free.chain; | |
7146af97 JB |
3580 | } |
3581 | else | |
7146af97 | 3582 | { |
2e471eb5 GM |
3583 | if (marker_block_index == MARKER_BLOCK_SIZE) |
3584 | { | |
3585 | struct marker_block *new; | |
34400008 GM |
3586 | new = (struct marker_block *) lisp_malloc (sizeof *new, |
3587 | MEM_TYPE_MISC); | |
2e471eb5 GM |
3588 | new->next = marker_block; |
3589 | marker_block = new; | |
3590 | marker_block_index = 0; | |
7b7990cc | 3591 | total_free_markers += MARKER_BLOCK_SIZE; |
2e471eb5 | 3592 | } |
d55c12ed | 3593 | XSETMISC (val, &marker_block->markers[marker_block_index].m); |
6b61353c | 3594 | marker_block_index++; |
7146af97 | 3595 | } |
177c0ea7 | 3596 | |
dafc79fa | 3597 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 3598 | |
7b7990cc | 3599 | --total_free_markers; |
2e471eb5 GM |
3600 | consing_since_gc += sizeof (union Lisp_Misc); |
3601 | misc_objects_consed++; | |
67ee9f6e | 3602 | XMISCANY (val)->gcmarkbit = 0; |
2e471eb5 GM |
3603 | return val; |
3604 | } | |
3605 | ||
7b7990cc KS |
3606 | /* Free a Lisp_Misc object */ |
3607 | ||
244ed907 | 3608 | static void |
971de7fb | 3609 | free_misc (Lisp_Object misc) |
7b7990cc | 3610 | { |
d314756e | 3611 | XMISCTYPE (misc) = Lisp_Misc_Free; |
7b7990cc KS |
3612 | XMISC (misc)->u_free.chain = marker_free_list; |
3613 | marker_free_list = XMISC (misc); | |
3614 | ||
3615 | total_free_markers++; | |
3616 | } | |
3617 | ||
42172a6b RS |
3618 | /* Return a Lisp_Misc_Save_Value object containing POINTER and |
3619 | INTEGER. This is used to package C values to call record_unwind_protect. | |
3620 | The unwind function can get the C values back using XSAVE_VALUE. */ | |
3621 | ||
3622 | Lisp_Object | |
9c4c5f81 | 3623 | make_save_value (void *pointer, ptrdiff_t integer) |
42172a6b RS |
3624 | { |
3625 | register Lisp_Object val; | |
3626 | register struct Lisp_Save_Value *p; | |
3627 | ||
3628 | val = allocate_misc (); | |
3629 | XMISCTYPE (val) = Lisp_Misc_Save_Value; | |
3630 | p = XSAVE_VALUE (val); | |
3631 | p->pointer = pointer; | |
3632 | p->integer = integer; | |
b766f870 | 3633 | p->dogc = 0; |
42172a6b RS |
3634 | return val; |
3635 | } | |
3636 | ||
a7ca3326 | 3637 | DEFUN ("make-marker", Fmake_marker, Smake_marker, 0, 0, 0, |
a6266d23 | 3638 | doc: /* Return a newly allocated marker which does not point at any place. */) |
5842a27b | 3639 | (void) |
2e471eb5 GM |
3640 | { |
3641 | register Lisp_Object val; | |
3642 | register struct Lisp_Marker *p; | |
7146af97 | 3643 | |
2e471eb5 GM |
3644 | val = allocate_misc (); |
3645 | XMISCTYPE (val) = Lisp_Misc_Marker; | |
3646 | p = XMARKER (val); | |
3647 | p->buffer = 0; | |
3648 | p->bytepos = 0; | |
3649 | p->charpos = 0; | |
ef89c2ce | 3650 | p->next = NULL; |
2e471eb5 | 3651 | p->insertion_type = 0; |
7146af97 JB |
3652 | return val; |
3653 | } | |
2e471eb5 GM |
3654 | |
3655 | /* Put MARKER back on the free list after using it temporarily. */ | |
3656 | ||
3657 | void | |
971de7fb | 3658 | free_marker (Lisp_Object marker) |
2e471eb5 | 3659 | { |
ef89c2ce | 3660 | unchain_marker (XMARKER (marker)); |
7b7990cc | 3661 | free_misc (marker); |
2e471eb5 GM |
3662 | } |
3663 | ||
c0696668 | 3664 | \f |
7146af97 | 3665 | /* Return a newly created vector or string with specified arguments as |
736471d1 RS |
3666 | elements. If all the arguments are characters that can fit |
3667 | in a string of events, make a string; otherwise, make a vector. | |
3668 | ||
3669 | Any number of arguments, even zero arguments, are allowed. */ | |
7146af97 JB |
3670 | |
3671 | Lisp_Object | |
971de7fb | 3672 | make_event_array (register int nargs, Lisp_Object *args) |
7146af97 JB |
3673 | { |
3674 | int i; | |
3675 | ||
3676 | for (i = 0; i < nargs; i++) | |
736471d1 | 3677 | /* The things that fit in a string |
c9ca4659 RS |
3678 | are characters that are in 0...127, |
3679 | after discarding the meta bit and all the bits above it. */ | |
e687453f | 3680 | if (!INTEGERP (args[i]) |
c11285dc | 3681 | || (XINT (args[i]) & ~(-CHAR_META)) >= 0200) |
7146af97 JB |
3682 | return Fvector (nargs, args); |
3683 | ||
3684 | /* Since the loop exited, we know that all the things in it are | |
3685 | characters, so we can make a string. */ | |
3686 | { | |
c13ccad2 | 3687 | Lisp_Object result; |
177c0ea7 | 3688 | |
50aee051 | 3689 | result = Fmake_string (make_number (nargs), make_number (0)); |
7146af97 | 3690 | for (i = 0; i < nargs; i++) |
736471d1 | 3691 | { |
46e7e6b0 | 3692 | SSET (result, i, XINT (args[i])); |
736471d1 RS |
3693 | /* Move the meta bit to the right place for a string char. */ |
3694 | if (XINT (args[i]) & CHAR_META) | |
46e7e6b0 | 3695 | SSET (result, i, SREF (result, i) | 0x80); |
736471d1 | 3696 | } |
177c0ea7 | 3697 | |
7146af97 JB |
3698 | return result; |
3699 | } | |
3700 | } | |
2e471eb5 GM |
3701 | |
3702 | ||
7146af97 | 3703 | \f |
24d8a105 RS |
3704 | /************************************************************************ |
3705 | Memory Full Handling | |
3706 | ************************************************************************/ | |
3707 | ||
3708 | ||
531b0165 PE |
3709 | /* Called if malloc (NBYTES) returns zero. If NBYTES == SIZE_MAX, |
3710 | there may have been size_t overflow so that malloc was never | |
3711 | called, or perhaps malloc was invoked successfully but the | |
3712 | resulting pointer had problems fitting into a tagged EMACS_INT. In | |
3713 | either case this counts as memory being full even though malloc did | |
3714 | not fail. */ | |
24d8a105 RS |
3715 | |
3716 | void | |
531b0165 | 3717 | memory_full (size_t nbytes) |
24d8a105 | 3718 | { |
531b0165 PE |
3719 | /* Do not go into hysterics merely because a large request failed. */ |
3720 | int enough_free_memory = 0; | |
2b6148e4 | 3721 | if (SPARE_MEMORY < nbytes) |
531b0165 | 3722 | { |
66606eea PE |
3723 | void *p; |
3724 | ||
3725 | MALLOC_BLOCK_INPUT; | |
3726 | p = malloc (SPARE_MEMORY); | |
531b0165 PE |
3727 | if (p) |
3728 | { | |
4d09bcf6 | 3729 | free (p); |
531b0165 PE |
3730 | enough_free_memory = 1; |
3731 | } | |
66606eea | 3732 | MALLOC_UNBLOCK_INPUT; |
531b0165 | 3733 | } |
24d8a105 | 3734 | |
531b0165 PE |
3735 | if (! enough_free_memory) |
3736 | { | |
3737 | int i; | |
24d8a105 | 3738 | |
531b0165 PE |
3739 | Vmemory_full = Qt; |
3740 | ||
3741 | memory_full_cons_threshold = sizeof (struct cons_block); | |
3742 | ||
3743 | /* The first time we get here, free the spare memory. */ | |
3744 | for (i = 0; i < sizeof (spare_memory) / sizeof (char *); i++) | |
3745 | if (spare_memory[i]) | |
3746 | { | |
3747 | if (i == 0) | |
3748 | free (spare_memory[i]); | |
3749 | else if (i >= 1 && i <= 4) | |
3750 | lisp_align_free (spare_memory[i]); | |
3751 | else | |
3752 | lisp_free (spare_memory[i]); | |
3753 | spare_memory[i] = 0; | |
3754 | } | |
3755 | ||
3756 | /* Record the space now used. When it decreases substantially, | |
3757 | we can refill the memory reserve. */ | |
4e75f29d | 3758 | #if !defined SYSTEM_MALLOC && !defined SYNC_INPUT |
531b0165 | 3759 | bytes_used_when_full = BYTES_USED; |
24d8a105 | 3760 | #endif |
531b0165 | 3761 | } |
24d8a105 RS |
3762 | |
3763 | /* This used to call error, but if we've run out of memory, we could | |
3764 | get infinite recursion trying to build the string. */ | |
9b306d37 | 3765 | xsignal (Qnil, Vmemory_signal_data); |
24d8a105 RS |
3766 | } |
3767 | ||
3768 | /* If we released our reserve (due to running out of memory), | |
3769 | and we have a fair amount free once again, | |
3770 | try to set aside another reserve in case we run out once more. | |
3771 | ||
3772 | This is called when a relocatable block is freed in ralloc.c, | |
3773 | and also directly from this file, in case we're not using ralloc.c. */ | |
3774 | ||
3775 | void | |
971de7fb | 3776 | refill_memory_reserve (void) |
24d8a105 RS |
3777 | { |
3778 | #ifndef SYSTEM_MALLOC | |
3779 | if (spare_memory[0] == 0) | |
903fe15d | 3780 | spare_memory[0] = (char *) malloc (SPARE_MEMORY); |
24d8a105 RS |
3781 | if (spare_memory[1] == 0) |
3782 | spare_memory[1] = (char *) lisp_align_malloc (sizeof (struct cons_block), | |
3783 | MEM_TYPE_CONS); | |
3784 | if (spare_memory[2] == 0) | |
3785 | spare_memory[2] = (char *) lisp_align_malloc (sizeof (struct cons_block), | |
3786 | MEM_TYPE_CONS); | |
3787 | if (spare_memory[3] == 0) | |
3788 | spare_memory[3] = (char *) lisp_align_malloc (sizeof (struct cons_block), | |
3789 | MEM_TYPE_CONS); | |
3790 | if (spare_memory[4] == 0) | |
3791 | spare_memory[4] = (char *) lisp_align_malloc (sizeof (struct cons_block), | |
3792 | MEM_TYPE_CONS); | |
3793 | if (spare_memory[5] == 0) | |
3794 | spare_memory[5] = (char *) lisp_malloc (sizeof (struct string_block), | |
3795 | MEM_TYPE_STRING); | |
3796 | if (spare_memory[6] == 0) | |
3797 | spare_memory[6] = (char *) lisp_malloc (sizeof (struct string_block), | |
3798 | MEM_TYPE_STRING); | |
3799 | if (spare_memory[0] && spare_memory[1] && spare_memory[5]) | |
3800 | Vmemory_full = Qnil; | |
3801 | #endif | |
3802 | } | |
3803 | \f | |
34400008 GM |
3804 | /************************************************************************ |
3805 | C Stack Marking | |
3806 | ************************************************************************/ | |
3807 | ||
13c844fb GM |
3808 | #if GC_MARK_STACK || defined GC_MALLOC_CHECK |
3809 | ||
71cf5fa0 GM |
3810 | /* Conservative C stack marking requires a method to identify possibly |
3811 | live Lisp objects given a pointer value. We do this by keeping | |
3812 | track of blocks of Lisp data that are allocated in a red-black tree | |
3813 | (see also the comment of mem_node which is the type of nodes in | |
3814 | that tree). Function lisp_malloc adds information for an allocated | |
3815 | block to the red-black tree with calls to mem_insert, and function | |
3816 | lisp_free removes it with mem_delete. Functions live_string_p etc | |
3817 | call mem_find to lookup information about a given pointer in the | |
3818 | tree, and use that to determine if the pointer points to a Lisp | |
3819 | object or not. */ | |
3820 | ||
34400008 GM |
3821 | /* Initialize this part of alloc.c. */ |
3822 | ||
3823 | static void | |
971de7fb | 3824 | mem_init (void) |
34400008 GM |
3825 | { |
3826 | mem_z.left = mem_z.right = MEM_NIL; | |
3827 | mem_z.parent = NULL; | |
3828 | mem_z.color = MEM_BLACK; | |
3829 | mem_z.start = mem_z.end = NULL; | |
3830 | mem_root = MEM_NIL; | |
3831 | } | |
3832 | ||
3833 | ||
3834 | /* Value is a pointer to the mem_node containing START. Value is | |
3835 | MEM_NIL if there is no node in the tree containing START. */ | |
3836 | ||
55d4c1b2 | 3837 | static inline struct mem_node * |
971de7fb | 3838 | mem_find (void *start) |
34400008 GM |
3839 | { |
3840 | struct mem_node *p; | |
3841 | ||
ece93c02 GM |
3842 | if (start < min_heap_address || start > max_heap_address) |
3843 | return MEM_NIL; | |
3844 | ||
34400008 GM |
3845 | /* Make the search always successful to speed up the loop below. */ |
3846 | mem_z.start = start; | |
3847 | mem_z.end = (char *) start + 1; | |
3848 | ||
3849 | p = mem_root; | |
3850 | while (start < p->start || start >= p->end) | |
3851 | p = start < p->start ? p->left : p->right; | |
3852 | return p; | |
3853 | } | |
3854 | ||
3855 | ||
3856 | /* Insert a new node into the tree for a block of memory with start | |
3857 | address START, end address END, and type TYPE. Value is a | |
3858 | pointer to the node that was inserted. */ | |
3859 | ||
3860 | static struct mem_node * | |
971de7fb | 3861 | mem_insert (void *start, void *end, enum mem_type type) |
34400008 GM |
3862 | { |
3863 | struct mem_node *c, *parent, *x; | |
3864 | ||
add3c3ea | 3865 | if (min_heap_address == NULL || start < min_heap_address) |
ece93c02 | 3866 | min_heap_address = start; |
add3c3ea | 3867 | if (max_heap_address == NULL || end > max_heap_address) |
ece93c02 GM |
3868 | max_heap_address = end; |
3869 | ||
34400008 GM |
3870 | /* See where in the tree a node for START belongs. In this |
3871 | particular application, it shouldn't happen that a node is already | |
3872 | present. For debugging purposes, let's check that. */ | |
3873 | c = mem_root; | |
3874 | parent = NULL; | |
3875 | ||
3876 | #if GC_MARK_STACK != GC_MAKE_GCPROS_NOOPS | |
177c0ea7 | 3877 | |
34400008 GM |
3878 | while (c != MEM_NIL) |
3879 | { | |
3880 | if (start >= c->start && start < c->end) | |
3881 | abort (); | |
3882 | parent = c; | |
3883 | c = start < c->start ? c->left : c->right; | |
3884 | } | |
177c0ea7 | 3885 | |
34400008 | 3886 | #else /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */ |
177c0ea7 | 3887 | |
34400008 GM |
3888 | while (c != MEM_NIL) |
3889 | { | |
3890 | parent = c; | |
3891 | c = start < c->start ? c->left : c->right; | |
3892 | } | |
177c0ea7 | 3893 | |
34400008 GM |
3894 | #endif /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */ |
3895 | ||
3896 | /* Create a new node. */ | |
877935b1 GM |
3897 | #ifdef GC_MALLOC_CHECK |
3898 | x = (struct mem_node *) _malloc_internal (sizeof *x); | |
3899 | if (x == NULL) | |
3900 | abort (); | |
3901 | #else | |
34400008 | 3902 | x = (struct mem_node *) xmalloc (sizeof *x); |
877935b1 | 3903 | #endif |
34400008 GM |
3904 | x->start = start; |
3905 | x->end = end; | |
3906 | x->type = type; | |
3907 | x->parent = parent; | |
3908 | x->left = x->right = MEM_NIL; | |
3909 | x->color = MEM_RED; | |
3910 | ||
3911 | /* Insert it as child of PARENT or install it as root. */ | |
3912 | if (parent) | |
3913 | { | |
3914 | if (start < parent->start) | |
3915 | parent->left = x; | |
3916 | else | |
3917 | parent->right = x; | |
3918 | } | |
177c0ea7 | 3919 | else |
34400008 GM |
3920 | mem_root = x; |
3921 | ||
3922 | /* Re-establish red-black tree properties. */ | |
3923 | mem_insert_fixup (x); | |
877935b1 | 3924 | |
34400008 GM |
3925 | return x; |
3926 | } | |
3927 | ||
3928 | ||
3929 | /* Re-establish the red-black properties of the tree, and thereby | |
3930 | balance the tree, after node X has been inserted; X is always red. */ | |
3931 | ||
3932 | static void | |
971de7fb | 3933 | mem_insert_fixup (struct mem_node *x) |
34400008 GM |
3934 | { |
3935 | while (x != mem_root && x->parent->color == MEM_RED) | |
3936 | { | |
3937 | /* X is red and its parent is red. This is a violation of | |
3938 | red-black tree property #3. */ | |
177c0ea7 | 3939 | |
34400008 GM |
3940 | if (x->parent == x->parent->parent->left) |
3941 | { | |
3942 | /* We're on the left side of our grandparent, and Y is our | |
3943 | "uncle". */ | |
3944 | struct mem_node *y = x->parent->parent->right; | |
177c0ea7 | 3945 | |
34400008 GM |
3946 | if (y->color == MEM_RED) |
3947 | { | |
3948 | /* Uncle and parent are red but should be black because | |
3949 | X is red. Change the colors accordingly and proceed | |
3950 | with the grandparent. */ | |
3951 | x->parent->color = MEM_BLACK; | |
3952 | y->color = MEM_BLACK; | |
3953 | x->parent->parent->color = MEM_RED; | |
3954 | x = x->parent->parent; | |
3955 | } | |
3956 | else | |
3957 | { | |
3958 | /* Parent and uncle have different colors; parent is | |
3959 | red, uncle is black. */ | |
3960 | if (x == x->parent->right) | |
3961 | { | |
3962 | x = x->parent; | |
3963 | mem_rotate_left (x); | |
3964 | } | |
3965 | ||
3966 | x->parent->color = MEM_BLACK; | |
3967 | x->parent->parent->color = MEM_RED; | |
3968 | mem_rotate_right (x->parent->parent); | |
3969 | } | |
3970 | } | |
3971 | else | |
3972 | { | |
3973 | /* This is the symmetrical case of above. */ | |
3974 | struct mem_node *y = x->parent->parent->left; | |
177c0ea7 | 3975 | |
34400008 GM |
3976 | if (y->color == MEM_RED) |
3977 | { | |
3978 | x->parent->color = MEM_BLACK; | |
3979 | y->color = MEM_BLACK; | |
3980 | x->parent->parent->color = MEM_RED; | |
3981 | x = x->parent->parent; | |
3982 | } | |
3983 | else | |
3984 | { | |
3985 | if (x == x->parent->left) | |
3986 | { | |
3987 | x = x->parent; | |
3988 | mem_rotate_right (x); | |
3989 | } | |
177c0ea7 | 3990 | |
34400008 GM |
3991 | x->parent->color = MEM_BLACK; |
3992 | x->parent->parent->color = MEM_RED; | |
3993 | mem_rotate_left (x->parent->parent); | |
3994 | } | |
3995 | } | |
3996 | } | |
3997 | ||
3998 | /* The root may have been changed to red due to the algorithm. Set | |
3999 | it to black so that property #5 is satisfied. */ | |
4000 | mem_root->color = MEM_BLACK; | |
4001 | } | |
4002 | ||
4003 | ||
177c0ea7 JB |
4004 | /* (x) (y) |
4005 | / \ / \ | |
34400008 GM |
4006 | a (y) ===> (x) c |
4007 | / \ / \ | |
4008 | b c a b */ | |
4009 | ||
4010 | static void | |
971de7fb | 4011 | mem_rotate_left (struct mem_node *x) |
34400008 GM |
4012 | { |
4013 | struct mem_node *y; | |
4014 | ||
4015 | /* Turn y's left sub-tree into x's right sub-tree. */ | |
4016 | y = x->right; | |
4017 | x->right = y->left; | |
4018 | if (y->left != MEM_NIL) | |
4019 | y->left->parent = x; | |
4020 | ||
4021 | /* Y's parent was x's parent. */ | |
4022 | if (y != MEM_NIL) | |
4023 | y->parent = x->parent; | |
4024 | ||
4025 | /* Get the parent to point to y instead of x. */ | |
4026 | if (x->parent) | |
4027 | { | |
4028 | if (x == x->parent->left) | |
4029 | x->parent->left = y; | |
4030 | else | |
4031 | x->parent->right = y; | |
4032 | } | |
4033 | else | |
4034 | mem_root = y; | |
4035 | ||
4036 | /* Put x on y's left. */ | |
4037 | y->left = x; | |
4038 | if (x != MEM_NIL) | |
4039 | x->parent = y; | |
4040 | } | |
4041 | ||
4042 | ||
177c0ea7 JB |
4043 | /* (x) (Y) |
4044 | / \ / \ | |
4045 | (y) c ===> a (x) | |
4046 | / \ / \ | |
34400008 GM |
4047 | a b b c */ |
4048 | ||
4049 | static void | |
971de7fb | 4050 | mem_rotate_right (struct mem_node *x) |
34400008 GM |
4051 | { |
4052 | struct mem_node *y = x->left; | |
4053 | ||
4054 | x->left = y->right; | |
4055 | if (y->right != MEM_NIL) | |
4056 | y->right->parent = x; | |
177c0ea7 | 4057 | |
34400008 GM |
4058 | if (y != MEM_NIL) |
4059 | y->parent = x->parent; | |
4060 | if (x->parent) | |
4061 | { | |
4062 | if (x == x->parent->right) | |
4063 | x->parent->right = y; | |
4064 | else | |
4065 | x->parent->left = y; | |
4066 | } | |
4067 | else | |
4068 | mem_root = y; | |
177c0ea7 | 4069 | |
34400008 GM |
4070 | y->right = x; |
4071 | if (x != MEM_NIL) | |
4072 | x->parent = y; | |
4073 | } | |
4074 | ||
4075 | ||
4076 | /* Delete node Z from the tree. If Z is null or MEM_NIL, do nothing. */ | |
4077 | ||
4078 | static void | |
971de7fb | 4079 | mem_delete (struct mem_node *z) |
34400008 GM |
4080 | { |
4081 | struct mem_node *x, *y; | |
4082 | ||
4083 | if (!z || z == MEM_NIL) | |
4084 | return; | |
4085 | ||
4086 | if (z->left == MEM_NIL || z->right == MEM_NIL) | |
4087 | y = z; | |
4088 | else | |
4089 | { | |
4090 | y = z->right; | |
4091 | while (y->left != MEM_NIL) | |
4092 | y = y->left; | |
4093 | } | |
4094 | ||
4095 | if (y->left != MEM_NIL) | |
4096 | x = y->left; | |
4097 | else | |
4098 | x = y->right; | |
4099 | ||
4100 | x->parent = y->parent; | |
4101 | if (y->parent) | |
4102 | { | |
4103 | if (y == y->parent->left) | |
4104 | y->parent->left = x; | |
4105 | else | |
4106 | y->parent->right = x; | |
4107 | } | |
4108 | else | |
4109 | mem_root = x; | |
4110 | ||
4111 | if (y != z) | |
4112 | { | |
4113 | z->start = y->start; | |
4114 | z->end = y->end; | |
4115 | z->type = y->type; | |
4116 | } | |
177c0ea7 | 4117 | |
34400008 GM |
4118 | if (y->color == MEM_BLACK) |
4119 | mem_delete_fixup (x); | |
877935b1 GM |
4120 | |
4121 | #ifdef GC_MALLOC_CHECK | |
4122 | _free_internal (y); | |
4123 | #else | |
34400008 | 4124 | xfree (y); |
877935b1 | 4125 | #endif |
34400008 GM |
4126 | } |
4127 | ||
4128 | ||
4129 | /* Re-establish the red-black properties of the tree, after a | |
4130 | deletion. */ | |
4131 | ||
4132 | static void | |
971de7fb | 4133 | mem_delete_fixup (struct mem_node *x) |
34400008 GM |
4134 | { |
4135 | while (x != mem_root && x->color == MEM_BLACK) | |
4136 | { | |
4137 | if (x == x->parent->left) | |
4138 | { | |
4139 | struct mem_node *w = x->parent->right; | |
177c0ea7 | 4140 | |
34400008 GM |
4141 | if (w->color == MEM_RED) |
4142 | { | |
4143 | w->color = MEM_BLACK; | |
4144 | x->parent->color = MEM_RED; | |
4145 | mem_rotate_left (x->parent); | |
4146 | w = x->parent->right; | |
4147 | } | |
177c0ea7 | 4148 | |
34400008 GM |
4149 | if (w->left->color == MEM_BLACK && w->right->color == MEM_BLACK) |
4150 | { | |
4151 | w->color = MEM_RED; | |
4152 | x = x->parent; | |
4153 | } | |
4154 | else | |
4155 | { | |
4156 | if (w->right->color == MEM_BLACK) | |
4157 | { | |
4158 | w->left->color = MEM_BLACK; | |
4159 | w->color = MEM_RED; | |
4160 | mem_rotate_right (w); | |
4161 | w = x->parent->right; | |
4162 | } | |
4163 | w->color = x->parent->color; | |
4164 | x->parent->color = MEM_BLACK; | |
4165 | w->right->color = MEM_BLACK; | |
4166 | mem_rotate_left (x->parent); | |
4167 | x = mem_root; | |
4168 | } | |
4169 | } | |
4170 | else | |
4171 | { | |
4172 | struct mem_node *w = x->parent->left; | |
177c0ea7 | 4173 | |
34400008 GM |
4174 | if (w->color == MEM_RED) |
4175 | { | |
4176 | w->color = MEM_BLACK; | |
4177 | x->parent->color = MEM_RED; | |
4178 | mem_rotate_right (x->parent); | |
4179 | w = x->parent->left; | |
4180 | } | |
177c0ea7 | 4181 | |
34400008 GM |
4182 | if (w->right->color == MEM_BLACK && w->left->color == MEM_BLACK) |
4183 | { | |
4184 | w->color = MEM_RED; | |
4185 | x = x->parent; | |
4186 | } | |
4187 | else | |
4188 | { | |
4189 | if (w->left->color == MEM_BLACK) | |
4190 | { | |
4191 | w->right->color = MEM_BLACK; | |
4192 | w->color = MEM_RED; | |
4193 | mem_rotate_left (w); | |
4194 | w = x->parent->left; | |
4195 | } | |
177c0ea7 | 4196 | |
34400008 GM |
4197 | w->color = x->parent->color; |
4198 | x->parent->color = MEM_BLACK; | |
4199 | w->left->color = MEM_BLACK; | |
4200 | mem_rotate_right (x->parent); | |
4201 | x = mem_root; | |
4202 | } | |
4203 | } | |
4204 | } | |
177c0ea7 | 4205 | |
34400008 GM |
4206 | x->color = MEM_BLACK; |
4207 | } | |
4208 | ||
4209 | ||
4210 | /* Value is non-zero if P is a pointer to a live Lisp string on | |
4211 | the heap. M is a pointer to the mem_block for P. */ | |
4212 | ||
55d4c1b2 | 4213 | static inline int |
971de7fb | 4214 | live_string_p (struct mem_node *m, void *p) |
34400008 GM |
4215 | { |
4216 | if (m->type == MEM_TYPE_STRING) | |
4217 | { | |
4218 | struct string_block *b = (struct string_block *) m->start; | |
14162469 | 4219 | ptrdiff_t offset = (char *) p - (char *) &b->strings[0]; |
34400008 GM |
4220 | |
4221 | /* P must point to the start of a Lisp_String structure, and it | |
4222 | must not be on the free-list. */ | |
176bc847 GM |
4223 | return (offset >= 0 |
4224 | && offset % sizeof b->strings[0] == 0 | |
6b61353c | 4225 | && offset < (STRING_BLOCK_SIZE * sizeof b->strings[0]) |
34400008 GM |
4226 | && ((struct Lisp_String *) p)->data != NULL); |
4227 | } | |
4228 | else | |
4229 | return 0; | |
4230 | } | |
4231 | ||
4232 | ||
4233 | /* Value is non-zero if P is a pointer to a live Lisp cons on | |
4234 | the heap. M is a pointer to the mem_block for P. */ | |
4235 | ||
55d4c1b2 | 4236 | static inline int |
971de7fb | 4237 | live_cons_p (struct mem_node *m, void *p) |
34400008 GM |
4238 | { |
4239 | if (m->type == MEM_TYPE_CONS) | |
4240 | { | |
4241 | struct cons_block *b = (struct cons_block *) m->start; | |
14162469 | 4242 | ptrdiff_t offset = (char *) p - (char *) &b->conses[0]; |
34400008 GM |
4243 | |
4244 | /* P must point to the start of a Lisp_Cons, not be | |
4245 | one of the unused cells in the current cons block, | |
4246 | and not be on the free-list. */ | |
176bc847 GM |
4247 | return (offset >= 0 |
4248 | && offset % sizeof b->conses[0] == 0 | |
6b61353c | 4249 | && offset < (CONS_BLOCK_SIZE * sizeof b->conses[0]) |
34400008 GM |
4250 | && (b != cons_block |
4251 | || offset / sizeof b->conses[0] < cons_block_index) | |
4252 | && !EQ (((struct Lisp_Cons *) p)->car, Vdead)); | |
4253 | } | |
4254 | else | |
4255 | return 0; | |
4256 | } | |
4257 | ||
4258 | ||
4259 | /* Value is non-zero if P is a pointer to a live Lisp symbol on | |
4260 | the heap. M is a pointer to the mem_block for P. */ | |
4261 | ||
55d4c1b2 | 4262 | static inline int |
971de7fb | 4263 | live_symbol_p (struct mem_node *m, void *p) |
34400008 GM |
4264 | { |
4265 | if (m->type == MEM_TYPE_SYMBOL) | |
4266 | { | |
4267 | struct symbol_block *b = (struct symbol_block *) m->start; | |
14162469 | 4268 | ptrdiff_t offset = (char *) p - (char *) &b->symbols[0]; |
177c0ea7 | 4269 | |
34400008 GM |
4270 | /* P must point to the start of a Lisp_Symbol, not be |
4271 | one of the unused cells in the current symbol block, | |
4272 | and not be on the free-list. */ | |
176bc847 GM |
4273 | return (offset >= 0 |
4274 | && offset % sizeof b->symbols[0] == 0 | |
6b61353c | 4275 | && offset < (SYMBOL_BLOCK_SIZE * sizeof b->symbols[0]) |
34400008 GM |
4276 | && (b != symbol_block |
4277 | || offset / sizeof b->symbols[0] < symbol_block_index) | |
4278 | && !EQ (((struct Lisp_Symbol *) p)->function, Vdead)); | |
4279 | } | |
4280 | else | |
4281 | return 0; | |
4282 | } | |
4283 | ||
4284 | ||
4285 | /* Value is non-zero if P is a pointer to a live Lisp float on | |
4286 | the heap. M is a pointer to the mem_block for P. */ | |
4287 | ||
55d4c1b2 | 4288 | static inline int |
971de7fb | 4289 | live_float_p (struct mem_node *m, void *p) |
34400008 GM |
4290 | { |
4291 | if (m->type == MEM_TYPE_FLOAT) | |
4292 | { | |
4293 | struct float_block *b = (struct float_block *) m->start; | |
14162469 | 4294 | ptrdiff_t offset = (char *) p - (char *) &b->floats[0]; |
177c0ea7 | 4295 | |
ab6780cd SM |
4296 | /* P must point to the start of a Lisp_Float and not be |
4297 | one of the unused cells in the current float block. */ | |
176bc847 GM |
4298 | return (offset >= 0 |
4299 | && offset % sizeof b->floats[0] == 0 | |
6b61353c | 4300 | && offset < (FLOAT_BLOCK_SIZE * sizeof b->floats[0]) |
34400008 | 4301 | && (b != float_block |
ab6780cd | 4302 | || offset / sizeof b->floats[0] < float_block_index)); |
34400008 GM |
4303 | } |
4304 | else | |
4305 | return 0; | |
4306 | } | |
4307 | ||
4308 | ||
4309 | /* Value is non-zero if P is a pointer to a live Lisp Misc on | |
4310 | the heap. M is a pointer to the mem_block for P. */ | |
4311 | ||
55d4c1b2 | 4312 | static inline int |
971de7fb | 4313 | live_misc_p (struct mem_node *m, void *p) |
34400008 GM |
4314 | { |
4315 | if (m->type == MEM_TYPE_MISC) | |
4316 | { | |
4317 | struct marker_block *b = (struct marker_block *) m->start; | |
14162469 | 4318 | ptrdiff_t offset = (char *) p - (char *) &b->markers[0]; |
177c0ea7 | 4319 | |
34400008 GM |
4320 | /* P must point to the start of a Lisp_Misc, not be |
4321 | one of the unused cells in the current misc block, | |
4322 | and not be on the free-list. */ | |
176bc847 GM |
4323 | return (offset >= 0 |
4324 | && offset % sizeof b->markers[0] == 0 | |
6b61353c | 4325 | && offset < (MARKER_BLOCK_SIZE * sizeof b->markers[0]) |
34400008 GM |
4326 | && (b != marker_block |
4327 | || offset / sizeof b->markers[0] < marker_block_index) | |
d314756e | 4328 | && ((union Lisp_Misc *) p)->u_any.type != Lisp_Misc_Free); |
34400008 GM |
4329 | } |
4330 | else | |
4331 | return 0; | |
4332 | } | |
4333 | ||
4334 | ||
4335 | /* Value is non-zero if P is a pointer to a live vector-like object. | |
4336 | M is a pointer to the mem_block for P. */ | |
4337 | ||
55d4c1b2 | 4338 | static inline int |
971de7fb | 4339 | live_vector_p (struct mem_node *m, void *p) |
34400008 | 4340 | { |
f3372c87 DA |
4341 | if (m->type == MEM_TYPE_VECTOR_BLOCK) |
4342 | { | |
4343 | /* This memory node corresponds to a vector block. */ | |
4344 | struct vector_block *block = (struct vector_block *) m->start; | |
4345 | struct Lisp_Vector *vector = (struct Lisp_Vector *) block->data; | |
4346 | ||
4347 | /* P is in the block's allocation range. Scan the block | |
4348 | up to P and see whether P points to the start of some | |
4349 | vector which is not on a free list. FIXME: check whether | |
4350 | some allocation patterns (probably a lot of short vectors) | |
4351 | may cause a substantial overhead of this loop. */ | |
4352 | while (VECTOR_IN_BLOCK (vector, block) | |
4353 | && vector <= (struct Lisp_Vector *) p) | |
4354 | { | |
4355 | if ((vector->header.size & VECTOR_FREE_LIST_FLAG) | |
4356 | == VECTOR_FREE_LIST_FLAG) | |
4357 | vector = ADVANCE (vector, (vector->header.size | |
4358 | & (VECTOR_BLOCK_SIZE - 1))); | |
4359 | else if (vector == p) | |
4360 | return 1; | |
4361 | else | |
4362 | vector = ADVANCE (vector, vector->header.next.nbytes); | |
4363 | } | |
4364 | } | |
4365 | else if (m->type == MEM_TYPE_VECTORLIKE && p == m->start) | |
4366 | /* This memory node corresponds to a large vector. */ | |
4367 | return 1; | |
4368 | return 0; | |
34400008 GM |
4369 | } |
4370 | ||
4371 | ||
2336fe58 | 4372 | /* Value is non-zero if P is a pointer to a live buffer. M is a |
34400008 GM |
4373 | pointer to the mem_block for P. */ |
4374 | ||
55d4c1b2 | 4375 | static inline int |
971de7fb | 4376 | live_buffer_p (struct mem_node *m, void *p) |
34400008 GM |
4377 | { |
4378 | /* P must point to the start of the block, and the buffer | |
4379 | must not have been killed. */ | |
4380 | return (m->type == MEM_TYPE_BUFFER | |
4381 | && p == m->start | |
5d8ea120 | 4382 | && !NILP (((struct buffer *) p)->BUFFER_INTERNAL_FIELD (name))); |
34400008 GM |
4383 | } |
4384 | ||
13c844fb GM |
4385 | #endif /* GC_MARK_STACK || defined GC_MALLOC_CHECK */ |
4386 | ||
4387 | #if GC_MARK_STACK | |
4388 | ||
34400008 GM |
4389 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
4390 | ||
4391 | /* Array of objects that are kept alive because the C stack contains | |
4392 | a pattern that looks like a reference to them . */ | |
4393 | ||
4394 | #define MAX_ZOMBIES 10 | |
4395 | static Lisp_Object zombies[MAX_ZOMBIES]; | |
4396 | ||
4397 | /* Number of zombie objects. */ | |
4398 | ||
211a0b2a | 4399 | static EMACS_INT nzombies; |
34400008 GM |
4400 | |
4401 | /* Number of garbage collections. */ | |
4402 | ||
211a0b2a | 4403 | static EMACS_INT ngcs; |
34400008 GM |
4404 | |
4405 | /* Average percentage of zombies per collection. */ | |
4406 | ||
4407 | static double avg_zombies; | |
4408 | ||
4409 | /* Max. number of live and zombie objects. */ | |
4410 | ||
211a0b2a | 4411 | static EMACS_INT max_live, max_zombies; |
34400008 GM |
4412 | |
4413 | /* Average number of live objects per GC. */ | |
4414 | ||
4415 | static double avg_live; | |
4416 | ||
a7ca3326 | 4417 | DEFUN ("gc-status", Fgc_status, Sgc_status, 0, 0, "", |
7ee72033 | 4418 | doc: /* Show information about live and zombie objects. */) |
5842a27b | 4419 | (void) |
34400008 | 4420 | { |
83fc9c63 | 4421 | Lisp_Object args[8], zombie_list = Qnil; |
211a0b2a | 4422 | EMACS_INT i; |
6e4b3fbe | 4423 | for (i = 0; i < min (MAX_ZOMBIES, nzombies); i++) |
83fc9c63 DL |
4424 | zombie_list = Fcons (zombies[i], zombie_list); |
4425 | args[0] = build_string ("%d GCs, avg live/zombies = %.2f/%.2f (%f%%), max %d/%d\nzombies: %S"); | |
34400008 GM |
4426 | args[1] = make_number (ngcs); |
4427 | args[2] = make_float (avg_live); | |
4428 | args[3] = make_float (avg_zombies); | |
4429 | args[4] = make_float (avg_zombies / avg_live / 100); | |
4430 | args[5] = make_number (max_live); | |
4431 | args[6] = make_number (max_zombies); | |
83fc9c63 DL |
4432 | args[7] = zombie_list; |
4433 | return Fmessage (8, args); | |
34400008 GM |
4434 | } |
4435 | ||
4436 | #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */ | |
4437 | ||
4438 | ||
182ff242 GM |
4439 | /* Mark OBJ if we can prove it's a Lisp_Object. */ |
4440 | ||
55d4c1b2 | 4441 | static inline void |
971de7fb | 4442 | mark_maybe_object (Lisp_Object obj) |
182ff242 | 4443 | { |
b609f591 YM |
4444 | void *po; |
4445 | struct mem_node *m; | |
4446 | ||
4447 | if (INTEGERP (obj)) | |
4448 | return; | |
4449 | ||
4450 | po = (void *) XPNTR (obj); | |
4451 | m = mem_find (po); | |
177c0ea7 | 4452 | |
182ff242 GM |
4453 | if (m != MEM_NIL) |
4454 | { | |
4455 | int mark_p = 0; | |
4456 | ||
8e50cc2d | 4457 | switch (XTYPE (obj)) |
182ff242 GM |
4458 | { |
4459 | case Lisp_String: | |
4460 | mark_p = (live_string_p (m, po) | |
4461 | && !STRING_MARKED_P ((struct Lisp_String *) po)); | |
4462 | break; | |
4463 | ||
4464 | case Lisp_Cons: | |
08b7c2cb | 4465 | mark_p = (live_cons_p (m, po) && !CONS_MARKED_P (XCONS (obj))); |
182ff242 GM |
4466 | break; |
4467 | ||
4468 | case Lisp_Symbol: | |
2336fe58 | 4469 | mark_p = (live_symbol_p (m, po) && !XSYMBOL (obj)->gcmarkbit); |
182ff242 GM |
4470 | break; |
4471 | ||
4472 | case Lisp_Float: | |
ab6780cd | 4473 | mark_p = (live_float_p (m, po) && !FLOAT_MARKED_P (XFLOAT (obj))); |
182ff242 GM |
4474 | break; |
4475 | ||
4476 | case Lisp_Vectorlike: | |
8e50cc2d | 4477 | /* Note: can't check BUFFERP before we know it's a |
182ff242 GM |
4478 | buffer because checking that dereferences the pointer |
4479 | PO which might point anywhere. */ | |
4480 | if (live_vector_p (m, po)) | |
8e50cc2d | 4481 | mark_p = !SUBRP (obj) && !VECTOR_MARKED_P (XVECTOR (obj)); |
182ff242 | 4482 | else if (live_buffer_p (m, po)) |
8e50cc2d | 4483 | mark_p = BUFFERP (obj) && !VECTOR_MARKED_P (XBUFFER (obj)); |
182ff242 GM |
4484 | break; |
4485 | ||
4486 | case Lisp_Misc: | |
67ee9f6e | 4487 | mark_p = (live_misc_p (m, po) && !XMISCANY (obj)->gcmarkbit); |
182ff242 | 4488 | break; |
6bbd7a29 | 4489 | |
2de9f71c | 4490 | default: |
6bbd7a29 | 4491 | break; |
182ff242 GM |
4492 | } |
4493 | ||
4494 | if (mark_p) | |
4495 | { | |
4496 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES | |
4497 | if (nzombies < MAX_ZOMBIES) | |
83fc9c63 | 4498 | zombies[nzombies] = obj; |
182ff242 GM |
4499 | ++nzombies; |
4500 | #endif | |
49723c04 | 4501 | mark_object (obj); |
182ff242 GM |
4502 | } |
4503 | } | |
4504 | } | |
ece93c02 GM |
4505 | |
4506 | ||
4507 | /* If P points to Lisp data, mark that as live if it isn't already | |
4508 | marked. */ | |
4509 | ||
55d4c1b2 | 4510 | static inline void |
971de7fb | 4511 | mark_maybe_pointer (void *p) |
ece93c02 GM |
4512 | { |
4513 | struct mem_node *m; | |
4514 | ||
bfe3e0a2 PE |
4515 | /* Quickly rule out some values which can't point to Lisp data. |
4516 | USE_LSB_TAG needs Lisp data to be aligned on multiples of 1 << GCTYPEBITS. | |
4517 | Otherwise, assume that Lisp data is aligned on even addresses. */ | |
4518 | if ((intptr_t) p % (USE_LSB_TAG ? 1 << GCTYPEBITS : 2)) | |
ece93c02 | 4519 | return; |
177c0ea7 | 4520 | |
ece93c02 GM |
4521 | m = mem_find (p); |
4522 | if (m != MEM_NIL) | |
4523 | { | |
4524 | Lisp_Object obj = Qnil; | |
177c0ea7 | 4525 | |
ece93c02 GM |
4526 | switch (m->type) |
4527 | { | |
4528 | case MEM_TYPE_NON_LISP: | |
2fe50224 | 4529 | /* Nothing to do; not a pointer to Lisp memory. */ |
ece93c02 | 4530 | break; |
177c0ea7 | 4531 | |
ece93c02 | 4532 | case MEM_TYPE_BUFFER: |
5e617bc2 | 4533 | if (live_buffer_p (m, p) && !VECTOR_MARKED_P ((struct buffer *)p)) |
ece93c02 GM |
4534 | XSETVECTOR (obj, p); |
4535 | break; | |
177c0ea7 | 4536 | |
ece93c02 | 4537 | case MEM_TYPE_CONS: |
08b7c2cb | 4538 | if (live_cons_p (m, p) && !CONS_MARKED_P ((struct Lisp_Cons *) p)) |
ece93c02 GM |
4539 | XSETCONS (obj, p); |
4540 | break; | |
177c0ea7 | 4541 | |
ece93c02 GM |
4542 | case MEM_TYPE_STRING: |
4543 | if (live_string_p (m, p) | |
4544 | && !STRING_MARKED_P ((struct Lisp_String *) p)) | |
4545 | XSETSTRING (obj, p); | |
4546 | break; | |
4547 | ||
4548 | case MEM_TYPE_MISC: | |
2336fe58 SM |
4549 | if (live_misc_p (m, p) && !((struct Lisp_Free *) p)->gcmarkbit) |
4550 | XSETMISC (obj, p); | |
ece93c02 | 4551 | break; |
177c0ea7 | 4552 | |
ece93c02 | 4553 | case MEM_TYPE_SYMBOL: |
2336fe58 | 4554 | if (live_symbol_p (m, p) && !((struct Lisp_Symbol *) p)->gcmarkbit) |
ece93c02 GM |
4555 | XSETSYMBOL (obj, p); |
4556 | break; | |
177c0ea7 | 4557 | |
ece93c02 | 4558 | case MEM_TYPE_FLOAT: |
ab6780cd | 4559 | if (live_float_p (m, p) && !FLOAT_MARKED_P (p)) |
ece93c02 GM |
4560 | XSETFLOAT (obj, p); |
4561 | break; | |
177c0ea7 | 4562 | |
9c545a55 | 4563 | case MEM_TYPE_VECTORLIKE: |
f3372c87 | 4564 | case MEM_TYPE_VECTOR_BLOCK: |
ece93c02 GM |
4565 | if (live_vector_p (m, p)) |
4566 | { | |
4567 | Lisp_Object tem; | |
4568 | XSETVECTOR (tem, p); | |
8e50cc2d | 4569 | if (!SUBRP (tem) && !VECTOR_MARKED_P (XVECTOR (tem))) |
ece93c02 GM |
4570 | obj = tem; |
4571 | } | |
4572 | break; | |
4573 | ||
4574 | default: | |
4575 | abort (); | |
4576 | } | |
4577 | ||
8e50cc2d | 4578 | if (!NILP (obj)) |
49723c04 | 4579 | mark_object (obj); |
ece93c02 GM |
4580 | } |
4581 | } | |
4582 | ||
4583 | ||
e3fb2efb PE |
4584 | /* Alignment of pointer values. Use offsetof, as it sometimes returns |
4585 | a smaller alignment than GCC's __alignof__ and mark_memory might | |
4586 | miss objects if __alignof__ were used. */ | |
3164aeac PE |
4587 | #define GC_POINTER_ALIGNMENT offsetof (struct {char a; void *b;}, b) |
4588 | ||
e3fb2efb PE |
4589 | /* Define POINTERS_MIGHT_HIDE_IN_OBJECTS to 1 if marking via C pointers does |
4590 | not suffice, which is the typical case. A host where a Lisp_Object is | |
4591 | wider than a pointer might allocate a Lisp_Object in non-adjacent halves. | |
4592 | If USE_LSB_TAG, the bottom half is not a valid pointer, but it should | |
4593 | suffice to widen it to to a Lisp_Object and check it that way. */ | |
bfe3e0a2 PE |
4594 | #if USE_LSB_TAG || VAL_MAX < UINTPTR_MAX |
4595 | # if !USE_LSB_TAG && VAL_MAX < UINTPTR_MAX >> GCTYPEBITS | |
e3fb2efb PE |
4596 | /* If tag bits straddle pointer-word boundaries, neither mark_maybe_pointer |
4597 | nor mark_maybe_object can follow the pointers. This should not occur on | |
4598 | any practical porting target. */ | |
4599 | # error "MSB type bits straddle pointer-word boundaries" | |
4600 | # endif | |
4601 | /* Marking via C pointers does not suffice, because Lisp_Objects contain | |
4602 | pointer words that hold pointers ORed with type bits. */ | |
4603 | # define POINTERS_MIGHT_HIDE_IN_OBJECTS 1 | |
4604 | #else | |
4605 | /* Marking via C pointers suffices, because Lisp_Objects contain pointer | |
4606 | words that hold unmodified pointers. */ | |
4607 | # define POINTERS_MIGHT_HIDE_IN_OBJECTS 0 | |
4608 | #endif | |
4609 | ||
55a314a5 YM |
4610 | /* Mark Lisp objects referenced from the address range START+OFFSET..END |
4611 | or END+OFFSET..START. */ | |
34400008 | 4612 | |
177c0ea7 | 4613 | static void |
3164aeac | 4614 | mark_memory (void *start, void *end) |
34400008 | 4615 | { |
ece93c02 | 4616 | void **pp; |
3164aeac | 4617 | int i; |
34400008 GM |
4618 | |
4619 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES | |
4620 | nzombies = 0; | |
4621 | #endif | |
4622 | ||
4623 | /* Make START the pointer to the start of the memory region, | |
4624 | if it isn't already. */ | |
4625 | if (end < start) | |
4626 | { | |
4627 | void *tem = start; | |
4628 | start = end; | |
4629 | end = tem; | |
4630 | } | |
ece93c02 | 4631 | |
ece93c02 GM |
4632 | /* Mark Lisp data pointed to. This is necessary because, in some |
4633 | situations, the C compiler optimizes Lisp objects away, so that | |
4634 | only a pointer to them remains. Example: | |
4635 | ||
4636 | DEFUN ("testme", Ftestme, Stestme, 0, 0, 0, "") | |
7ee72033 | 4637 | () |
ece93c02 GM |
4638 | { |
4639 | Lisp_Object obj = build_string ("test"); | |
4640 | struct Lisp_String *s = XSTRING (obj); | |
4641 | Fgarbage_collect (); | |
4642 | fprintf (stderr, "test `%s'\n", s->data); | |
4643 | return Qnil; | |
4644 | } | |
4645 | ||
4646 | Here, `obj' isn't really used, and the compiler optimizes it | |
4647 | away. The only reference to the life string is through the | |
4648 | pointer `s'. */ | |
177c0ea7 | 4649 | |
3164aeac PE |
4650 | for (pp = start; (void *) pp < end; pp++) |
4651 | for (i = 0; i < sizeof *pp; i += GC_POINTER_ALIGNMENT) | |
27f3c637 | 4652 | { |
e3fb2efb PE |
4653 | void *p = *(void **) ((char *) pp + i); |
4654 | mark_maybe_pointer (p); | |
4655 | if (POINTERS_MIGHT_HIDE_IN_OBJECTS) | |
646b5f55 | 4656 | mark_maybe_object (XIL ((intptr_t) p)); |
27f3c637 | 4657 | } |
182ff242 GM |
4658 | } |
4659 | ||
30f637f8 DL |
4660 | /* setjmp will work with GCC unless NON_SAVING_SETJMP is defined in |
4661 | the GCC system configuration. In gcc 3.2, the only systems for | |
4662 | which this is so are i386-sco5 non-ELF, i386-sysv3 (maybe included | |
4663 | by others?) and ns32k-pc532-min. */ | |
182ff242 GM |
4664 | |
4665 | #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS | |
4666 | ||
4667 | static int setjmp_tested_p, longjmps_done; | |
4668 | ||
4669 | #define SETJMP_WILL_LIKELY_WORK "\ | |
4670 | \n\ | |
4671 | Emacs garbage collector has been changed to use conservative stack\n\ | |
4672 | marking. Emacs has determined that the method it uses to do the\n\ | |
4673 | marking will likely work on your system, but this isn't sure.\n\ | |
4674 | \n\ | |
4675 | If you are a system-programmer, or can get the help of a local wizard\n\ | |
4676 | who is, please take a look at the function mark_stack in alloc.c, and\n\ | |
4677 | verify that the methods used are appropriate for your system.\n\ | |
4678 | \n\ | |
d191623b | 4679 | Please mail the result to <emacs-devel@gnu.org>.\n\ |
182ff242 GM |
4680 | " |
4681 | ||
4682 | #define SETJMP_WILL_NOT_WORK "\ | |
4683 | \n\ | |
4684 | Emacs garbage collector has been changed to use conservative stack\n\ | |
4685 | marking. Emacs has determined that the default method it uses to do the\n\ | |
4686 | marking will not work on your system. We will need a system-dependent\n\ | |
4687 | solution for your system.\n\ | |
4688 | \n\ | |
4689 | Please take a look at the function mark_stack in alloc.c, and\n\ | |
4690 | try to find a way to make it work on your system.\n\ | |
30f637f8 DL |
4691 | \n\ |
4692 | Note that you may get false negatives, depending on the compiler.\n\ | |
4693 | In particular, you need to use -O with GCC for this test.\n\ | |
4694 | \n\ | |
d191623b | 4695 | Please mail the result to <emacs-devel@gnu.org>.\n\ |
182ff242 GM |
4696 | " |
4697 | ||
4698 | ||
4699 | /* Perform a quick check if it looks like setjmp saves registers in a | |
4700 | jmp_buf. Print a message to stderr saying so. When this test | |
4701 | succeeds, this is _not_ a proof that setjmp is sufficient for | |
4702 | conservative stack marking. Only the sources or a disassembly | |
4703 | can prove that. */ | |
4704 | ||
4705 | static void | |
2018939f | 4706 | test_setjmp (void) |
182ff242 GM |
4707 | { |
4708 | char buf[10]; | |
4709 | register int x; | |
4710 | jmp_buf jbuf; | |
4711 | int result = 0; | |
4712 | ||
4713 | /* Arrange for X to be put in a register. */ | |
4714 | sprintf (buf, "1"); | |
4715 | x = strlen (buf); | |
4716 | x = 2 * x - 1; | |
4717 | ||
4718 | setjmp (jbuf); | |
4719 | if (longjmps_done == 1) | |
34400008 | 4720 | { |
182ff242 | 4721 | /* Came here after the longjmp at the end of the function. |
34400008 | 4722 | |
182ff242 GM |
4723 | If x == 1, the longjmp has restored the register to its |
4724 | value before the setjmp, and we can hope that setjmp | |
4725 | saves all such registers in the jmp_buf, although that | |
4726 | isn't sure. | |
34400008 | 4727 | |
182ff242 GM |
4728 | For other values of X, either something really strange is |
4729 | taking place, or the setjmp just didn't save the register. */ | |
4730 | ||
4731 | if (x == 1) | |
4732 | fprintf (stderr, SETJMP_WILL_LIKELY_WORK); | |
4733 | else | |
4734 | { | |
4735 | fprintf (stderr, SETJMP_WILL_NOT_WORK); | |
4736 | exit (1); | |
34400008 GM |
4737 | } |
4738 | } | |
182ff242 GM |
4739 | |
4740 | ++longjmps_done; | |
4741 | x = 2; | |
4742 | if (longjmps_done == 1) | |
4743 | longjmp (jbuf, 1); | |
34400008 GM |
4744 | } |
4745 | ||
182ff242 GM |
4746 | #endif /* not GC_SAVE_REGISTERS_ON_STACK && not GC_SETJMP_WORKS */ |
4747 | ||
34400008 GM |
4748 | |
4749 | #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS | |
4750 | ||
4751 | /* Abort if anything GCPRO'd doesn't survive the GC. */ | |
4752 | ||
4753 | static void | |
2018939f | 4754 | check_gcpros (void) |
34400008 GM |
4755 | { |
4756 | struct gcpro *p; | |
f66c7cf8 | 4757 | ptrdiff_t i; |
34400008 GM |
4758 | |
4759 | for (p = gcprolist; p; p = p->next) | |
4760 | for (i = 0; i < p->nvars; ++i) | |
4761 | if (!survives_gc_p (p->var[i])) | |
92cc28b2 SM |
4762 | /* FIXME: It's not necessarily a bug. It might just be that the |
4763 | GCPRO is unnecessary or should release the object sooner. */ | |
34400008 GM |
4764 | abort (); |
4765 | } | |
4766 | ||
4767 | #elif GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES | |
4768 | ||
4769 | static void | |
2018939f | 4770 | dump_zombies (void) |
34400008 GM |
4771 | { |
4772 | int i; | |
4773 | ||
6e4b3fbe | 4774 | fprintf (stderr, "\nZombies kept alive = %"pI"d:\n", nzombies); |
34400008 GM |
4775 | for (i = 0; i < min (MAX_ZOMBIES, nzombies); ++i) |
4776 | { | |
4777 | fprintf (stderr, " %d = ", i); | |
4778 | debug_print (zombies[i]); | |
4779 | } | |
4780 | } | |
4781 | ||
4782 | #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */ | |
4783 | ||
4784 | ||
182ff242 GM |
4785 | /* Mark live Lisp objects on the C stack. |
4786 | ||
4787 | There are several system-dependent problems to consider when | |
4788 | porting this to new architectures: | |
4789 | ||
4790 | Processor Registers | |
4791 | ||
4792 | We have to mark Lisp objects in CPU registers that can hold local | |
4793 | variables or are used to pass parameters. | |
4794 | ||
4795 | If GC_SAVE_REGISTERS_ON_STACK is defined, it should expand to | |
4796 | something that either saves relevant registers on the stack, or | |
4797 | calls mark_maybe_object passing it each register's contents. | |
4798 | ||
4799 | If GC_SAVE_REGISTERS_ON_STACK is not defined, the current | |
4800 | implementation assumes that calling setjmp saves registers we need | |
4801 | to see in a jmp_buf which itself lies on the stack. This doesn't | |
4802 | have to be true! It must be verified for each system, possibly | |
4803 | by taking a look at the source code of setjmp. | |
4804 | ||
2018939f AS |
4805 | If __builtin_unwind_init is available (defined by GCC >= 2.8) we |
4806 | can use it as a machine independent method to store all registers | |
4807 | to the stack. In this case the macros described in the previous | |
4808 | two paragraphs are not used. | |
4809 | ||
182ff242 GM |
4810 | Stack Layout |
4811 | ||
4812 | Architectures differ in the way their processor stack is organized. | |
4813 | For example, the stack might look like this | |
4814 | ||
4815 | +----------------+ | |
4816 | | Lisp_Object | size = 4 | |
4817 | +----------------+ | |
4818 | | something else | size = 2 | |
4819 | +----------------+ | |
4820 | | Lisp_Object | size = 4 | |
4821 | +----------------+ | |
4822 | | ... | | |
4823 | ||
4824 | In such a case, not every Lisp_Object will be aligned equally. To | |
4825 | find all Lisp_Object on the stack it won't be sufficient to walk | |
4826 | the stack in steps of 4 bytes. Instead, two passes will be | |
4827 | necessary, one starting at the start of the stack, and a second | |
4828 | pass starting at the start of the stack + 2. Likewise, if the | |
4829 | minimal alignment of Lisp_Objects on the stack is 1, four passes | |
4830 | would be necessary, each one starting with one byte more offset | |
c9af454e | 4831 | from the stack start. */ |
34400008 GM |
4832 | |
4833 | static void | |
971de7fb | 4834 | mark_stack (void) |
34400008 | 4835 | { |
34400008 GM |
4836 | void *end; |
4837 | ||
2018939f AS |
4838 | #ifdef HAVE___BUILTIN_UNWIND_INIT |
4839 | /* Force callee-saved registers and register windows onto the stack. | |
4840 | This is the preferred method if available, obviating the need for | |
4841 | machine dependent methods. */ | |
4842 | __builtin_unwind_init (); | |
4843 | end = &end; | |
4844 | #else /* not HAVE___BUILTIN_UNWIND_INIT */ | |
dff45157 PE |
4845 | #ifndef GC_SAVE_REGISTERS_ON_STACK |
4846 | /* jmp_buf may not be aligned enough on darwin-ppc64 */ | |
4847 | union aligned_jmpbuf { | |
4848 | Lisp_Object o; | |
4849 | jmp_buf j; | |
4850 | } j; | |
4851 | volatile int stack_grows_down_p = (char *) &j > (char *) stack_base; | |
4852 | #endif | |
34400008 GM |
4853 | /* This trick flushes the register windows so that all the state of |
4854 | the process is contained in the stack. */ | |
ab6780cd | 4855 | /* Fixme: Code in the Boehm GC suggests flushing (with `flushrs') is |
422eec7e DL |
4856 | needed on ia64 too. See mach_dep.c, where it also says inline |
4857 | assembler doesn't work with relevant proprietary compilers. */ | |
4a00783e | 4858 | #ifdef __sparc__ |
4d18a7a2 DN |
4859 | #if defined (__sparc64__) && defined (__FreeBSD__) |
4860 | /* FreeBSD does not have a ta 3 handler. */ | |
4c1616be CY |
4861 | asm ("flushw"); |
4862 | #else | |
34400008 | 4863 | asm ("ta 3"); |
4c1616be | 4864 | #endif |
34400008 | 4865 | #endif |
177c0ea7 | 4866 | |
34400008 GM |
4867 | /* Save registers that we need to see on the stack. We need to see |
4868 | registers used to hold register variables and registers used to | |
4869 | pass parameters. */ | |
4870 | #ifdef GC_SAVE_REGISTERS_ON_STACK | |
4871 | GC_SAVE_REGISTERS_ON_STACK (end); | |
182ff242 | 4872 | #else /* not GC_SAVE_REGISTERS_ON_STACK */ |
177c0ea7 | 4873 | |
182ff242 GM |
4874 | #ifndef GC_SETJMP_WORKS /* If it hasn't been checked yet that |
4875 | setjmp will definitely work, test it | |
4876 | and print a message with the result | |
4877 | of the test. */ | |
4878 | if (!setjmp_tested_p) | |
4879 | { | |
4880 | setjmp_tested_p = 1; | |
4881 | test_setjmp (); | |
4882 | } | |
4883 | #endif /* GC_SETJMP_WORKS */ | |
177c0ea7 | 4884 | |
55a314a5 | 4885 | setjmp (j.j); |
34400008 | 4886 | end = stack_grows_down_p ? (char *) &j + sizeof j : (char *) &j; |
182ff242 | 4887 | #endif /* not GC_SAVE_REGISTERS_ON_STACK */ |
2018939f | 4888 | #endif /* not HAVE___BUILTIN_UNWIND_INIT */ |
34400008 GM |
4889 | |
4890 | /* This assumes that the stack is a contiguous region in memory. If | |
182ff242 GM |
4891 | that's not the case, something has to be done here to iterate |
4892 | over the stack segments. */ | |
3164aeac PE |
4893 | mark_memory (stack_base, end); |
4894 | ||
4dec23ff AS |
4895 | /* Allow for marking a secondary stack, like the register stack on the |
4896 | ia64. */ | |
4897 | #ifdef GC_MARK_SECONDARY_STACK | |
4898 | GC_MARK_SECONDARY_STACK (); | |
4899 | #endif | |
34400008 GM |
4900 | |
4901 | #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS | |
4902 | check_gcpros (); | |
4903 | #endif | |
4904 | } | |
4905 | ||
34400008 GM |
4906 | #endif /* GC_MARK_STACK != 0 */ |
4907 | ||
4908 | ||
7ffb6955 | 4909 | /* Determine whether it is safe to access memory at address P. */ |
d3d47262 | 4910 | static int |
971de7fb | 4911 | valid_pointer_p (void *p) |
7ffb6955 | 4912 | { |
f892cf9c EZ |
4913 | #ifdef WINDOWSNT |
4914 | return w32_valid_pointer_p (p, 16); | |
4915 | #else | |
41bed37d | 4916 | int fd[2]; |
7ffb6955 KS |
4917 | |
4918 | /* Obviously, we cannot just access it (we would SEGV trying), so we | |
4919 | trick the o/s to tell us whether p is a valid pointer. | |
4920 | Unfortunately, we cannot use NULL_DEVICE here, as emacs_write may | |
4921 | not validate p in that case. */ | |
4922 | ||
41bed37d | 4923 | if (pipe (fd) == 0) |
7ffb6955 | 4924 | { |
41bed37d PE |
4925 | int valid = (emacs_write (fd[1], (char *) p, 16) == 16); |
4926 | emacs_close (fd[1]); | |
4927 | emacs_close (fd[0]); | |
7ffb6955 KS |
4928 | return valid; |
4929 | } | |
4930 | ||
4931 | return -1; | |
f892cf9c | 4932 | #endif |
7ffb6955 | 4933 | } |
3cd55735 KS |
4934 | |
4935 | /* Return 1 if OBJ is a valid lisp object. | |
4936 | Return 0 if OBJ is NOT a valid lisp object. | |
4937 | Return -1 if we cannot validate OBJ. | |
7c0ab7d9 RS |
4938 | This function can be quite slow, |
4939 | so it should only be used in code for manual debugging. */ | |
3cd55735 KS |
4940 | |
4941 | int | |
971de7fb | 4942 | valid_lisp_object_p (Lisp_Object obj) |
3cd55735 | 4943 | { |
de7124a7 | 4944 | void *p; |
7ffb6955 | 4945 | #if GC_MARK_STACK |
3cd55735 | 4946 | struct mem_node *m; |
de7124a7 | 4947 | #endif |
3cd55735 KS |
4948 | |
4949 | if (INTEGERP (obj)) | |
4950 | return 1; | |
4951 | ||
4952 | p = (void *) XPNTR (obj); | |
3cd55735 KS |
4953 | if (PURE_POINTER_P (p)) |
4954 | return 1; | |
4955 | ||
de7124a7 | 4956 | #if !GC_MARK_STACK |
7ffb6955 | 4957 | return valid_pointer_p (p); |
de7124a7 KS |
4958 | #else |
4959 | ||
3cd55735 KS |
4960 | m = mem_find (p); |
4961 | ||
4962 | if (m == MEM_NIL) | |
7ffb6955 KS |
4963 | { |
4964 | int valid = valid_pointer_p (p); | |
4965 | if (valid <= 0) | |
4966 | return valid; | |
4967 | ||
4968 | if (SUBRP (obj)) | |
4969 | return 1; | |
4970 | ||
4971 | return 0; | |
4972 | } | |
3cd55735 KS |
4973 | |
4974 | switch (m->type) | |
4975 | { | |
4976 | case MEM_TYPE_NON_LISP: | |
4977 | return 0; | |
4978 | ||
4979 | case MEM_TYPE_BUFFER: | |
4980 | return live_buffer_p (m, p); | |
4981 | ||
4982 | case MEM_TYPE_CONS: | |
4983 | return live_cons_p (m, p); | |
4984 | ||
4985 | case MEM_TYPE_STRING: | |
4986 | return live_string_p (m, p); | |
4987 | ||
4988 | case MEM_TYPE_MISC: | |
4989 | return live_misc_p (m, p); | |
4990 | ||
4991 | case MEM_TYPE_SYMBOL: | |
4992 | return live_symbol_p (m, p); | |
4993 | ||
4994 | case MEM_TYPE_FLOAT: | |
4995 | return live_float_p (m, p); | |
4996 | ||
9c545a55 | 4997 | case MEM_TYPE_VECTORLIKE: |
f3372c87 | 4998 | case MEM_TYPE_VECTOR_BLOCK: |
3cd55735 KS |
4999 | return live_vector_p (m, p); |
5000 | ||
5001 | default: | |
5002 | break; | |
5003 | } | |
5004 | ||
5005 | return 0; | |
5006 | #endif | |
5007 | } | |
5008 | ||
5009 | ||
5010 | ||
34400008 | 5011 | \f |
2e471eb5 GM |
5012 | /*********************************************************************** |
5013 | Pure Storage Management | |
5014 | ***********************************************************************/ | |
5015 | ||
1f0b3fd2 GM |
5016 | /* Allocate room for SIZE bytes from pure Lisp storage and return a |
5017 | pointer to it. TYPE is the Lisp type for which the memory is | |
e5bc14d4 | 5018 | allocated. TYPE < 0 means it's not used for a Lisp object. */ |
1f0b3fd2 | 5019 | |
261cb4bb | 5020 | static void * |
971de7fb | 5021 | pure_alloc (size_t size, int type) |
1f0b3fd2 | 5022 | { |
261cb4bb | 5023 | void *result; |
bfe3e0a2 | 5024 | #if USE_LSB_TAG |
6b61353c KH |
5025 | size_t alignment = (1 << GCTYPEBITS); |
5026 | #else | |
44117420 | 5027 | size_t alignment = sizeof (EMACS_INT); |
1f0b3fd2 GM |
5028 | |
5029 | /* Give Lisp_Floats an extra alignment. */ | |
5030 | if (type == Lisp_Float) | |
5031 | { | |
1f0b3fd2 GM |
5032 | #if defined __GNUC__ && __GNUC__ >= 2 |
5033 | alignment = __alignof (struct Lisp_Float); | |
5034 | #else | |
5035 | alignment = sizeof (struct Lisp_Float); | |
5036 | #endif | |
9e713715 | 5037 | } |
6b61353c | 5038 | #endif |
1f0b3fd2 | 5039 | |
44117420 | 5040 | again: |
e5bc14d4 YM |
5041 | if (type >= 0) |
5042 | { | |
5043 | /* Allocate space for a Lisp object from the beginning of the free | |
5044 | space with taking account of alignment. */ | |
5045 | result = ALIGN (purebeg + pure_bytes_used_lisp, alignment); | |
5046 | pure_bytes_used_lisp = ((char *)result - (char *)purebeg) + size; | |
5047 | } | |
5048 | else | |
5049 | { | |
5050 | /* Allocate space for a non-Lisp object from the end of the free | |
5051 | space. */ | |
5052 | pure_bytes_used_non_lisp += size; | |
5053 | result = purebeg + pure_size - pure_bytes_used_non_lisp; | |
5054 | } | |
5055 | pure_bytes_used = pure_bytes_used_lisp + pure_bytes_used_non_lisp; | |
44117420 KS |
5056 | |
5057 | if (pure_bytes_used <= pure_size) | |
5058 | return result; | |
5059 | ||
5060 | /* Don't allocate a large amount here, | |
5061 | because it might get mmap'd and then its address | |
5062 | might not be usable. */ | |
5063 | purebeg = (char *) xmalloc (10000); | |
5064 | pure_size = 10000; | |
5065 | pure_bytes_used_before_overflow += pure_bytes_used - size; | |
5066 | pure_bytes_used = 0; | |
e5bc14d4 | 5067 | pure_bytes_used_lisp = pure_bytes_used_non_lisp = 0; |
44117420 | 5068 | goto again; |
1f0b3fd2 GM |
5069 | } |
5070 | ||
5071 | ||
852f8cdc | 5072 | /* Print a warning if PURESIZE is too small. */ |
9e713715 GM |
5073 | |
5074 | void | |
971de7fb | 5075 | check_pure_size (void) |
9e713715 GM |
5076 | { |
5077 | if (pure_bytes_used_before_overflow) | |
c2982e87 PE |
5078 | message (("emacs:0:Pure Lisp storage overflow (approx. %"pI"d" |
5079 | " bytes needed)"), | |
5080 | pure_bytes_used + pure_bytes_used_before_overflow); | |
9e713715 GM |
5081 | } |
5082 | ||
5083 | ||
79fd0489 YM |
5084 | /* Find the byte sequence {DATA[0], ..., DATA[NBYTES-1], '\0'} from |
5085 | the non-Lisp data pool of the pure storage, and return its start | |
5086 | address. Return NULL if not found. */ | |
5087 | ||
5088 | static char * | |
d311d28c | 5089 | find_string_data_in_pure (const char *data, ptrdiff_t nbytes) |
79fd0489 | 5090 | { |
14162469 | 5091 | int i; |
d311d28c | 5092 | ptrdiff_t skip, bm_skip[256], last_char_skip, infinity, start, start_max; |
2aff7c53 | 5093 | const unsigned char *p; |
79fd0489 YM |
5094 | char *non_lisp_beg; |
5095 | ||
d311d28c | 5096 | if (pure_bytes_used_non_lisp <= nbytes) |
79fd0489 YM |
5097 | return NULL; |
5098 | ||
5099 | /* Set up the Boyer-Moore table. */ | |
5100 | skip = nbytes + 1; | |
5101 | for (i = 0; i < 256; i++) | |
5102 | bm_skip[i] = skip; | |
5103 | ||
2aff7c53 | 5104 | p = (const unsigned char *) data; |
79fd0489 YM |
5105 | while (--skip > 0) |
5106 | bm_skip[*p++] = skip; | |
5107 | ||
5108 | last_char_skip = bm_skip['\0']; | |
5109 | ||
5110 | non_lisp_beg = purebeg + pure_size - pure_bytes_used_non_lisp; | |
5111 | start_max = pure_bytes_used_non_lisp - (nbytes + 1); | |
5112 | ||
5113 | /* See the comments in the function `boyer_moore' (search.c) for the | |
5114 | use of `infinity'. */ | |
5115 | infinity = pure_bytes_used_non_lisp + 1; | |
5116 | bm_skip['\0'] = infinity; | |
5117 | ||
2aff7c53 | 5118 | p = (const unsigned char *) non_lisp_beg + nbytes; |
79fd0489 YM |
5119 | start = 0; |
5120 | do | |
5121 | { | |
5122 | /* Check the last character (== '\0'). */ | |
5123 | do | |
5124 | { | |
5125 | start += bm_skip[*(p + start)]; | |
5126 | } | |
5127 | while (start <= start_max); | |
5128 | ||
5129 | if (start < infinity) | |
5130 | /* Couldn't find the last character. */ | |
5131 | return NULL; | |
5132 | ||
5133 | /* No less than `infinity' means we could find the last | |
5134 | character at `p[start - infinity]'. */ | |
5135 | start -= infinity; | |
5136 | ||
5137 | /* Check the remaining characters. */ | |
5138 | if (memcmp (data, non_lisp_beg + start, nbytes) == 0) | |
5139 | /* Found. */ | |
5140 | return non_lisp_beg + start; | |
5141 | ||
5142 | start += last_char_skip; | |
5143 | } | |
5144 | while (start <= start_max); | |
5145 | ||
5146 | return NULL; | |
5147 | } | |
5148 | ||
5149 | ||
2e471eb5 GM |
5150 | /* Return a string allocated in pure space. DATA is a buffer holding |
5151 | NCHARS characters, and NBYTES bytes of string data. MULTIBYTE | |
5152 | non-zero means make the result string multibyte. | |
1a4f1e2c | 5153 | |
2e471eb5 GM |
5154 | Must get an error if pure storage is full, since if it cannot hold |
5155 | a large string it may be able to hold conses that point to that | |
5156 | string; then the string is not protected from gc. */ | |
7146af97 JB |
5157 | |
5158 | Lisp_Object | |
14162469 | 5159 | make_pure_string (const char *data, |
d311d28c | 5160 | ptrdiff_t nchars, ptrdiff_t nbytes, int multibyte) |
7146af97 | 5161 | { |
2e471eb5 GM |
5162 | Lisp_Object string; |
5163 | struct Lisp_String *s; | |
c0696668 | 5164 | |
1f0b3fd2 | 5165 | s = (struct Lisp_String *) pure_alloc (sizeof *s, Lisp_String); |
90256841 | 5166 | s->data = (unsigned char *) find_string_data_in_pure (data, nbytes); |
79fd0489 YM |
5167 | if (s->data == NULL) |
5168 | { | |
5169 | s->data = (unsigned char *) pure_alloc (nbytes + 1, -1); | |
72af86bd | 5170 | memcpy (s->data, data, nbytes); |
79fd0489 YM |
5171 | s->data[nbytes] = '\0'; |
5172 | } | |
2e471eb5 GM |
5173 | s->size = nchars; |
5174 | s->size_byte = multibyte ? nbytes : -1; | |
2e471eb5 | 5175 | s->intervals = NULL_INTERVAL; |
2e471eb5 GM |
5176 | XSETSTRING (string, s); |
5177 | return string; | |
7146af97 JB |
5178 | } |
5179 | ||
a56eaaef DN |
5180 | /* Return a string a string allocated in pure space. Do not allocate |
5181 | the string data, just point to DATA. */ | |
5182 | ||
5183 | Lisp_Object | |
5184 | make_pure_c_string (const char *data) | |
5185 | { | |
5186 | Lisp_Object string; | |
5187 | struct Lisp_String *s; | |
d311d28c | 5188 | ptrdiff_t nchars = strlen (data); |
a56eaaef DN |
5189 | |
5190 | s = (struct Lisp_String *) pure_alloc (sizeof *s, Lisp_String); | |
5191 | s->size = nchars; | |
5192 | s->size_byte = -1; | |
323637a2 | 5193 | s->data = (unsigned char *) data; |
a56eaaef DN |
5194 | s->intervals = NULL_INTERVAL; |
5195 | XSETSTRING (string, s); | |
5196 | return string; | |
5197 | } | |
2e471eb5 | 5198 | |
34400008 GM |
5199 | /* Return a cons allocated from pure space. Give it pure copies |
5200 | of CAR as car and CDR as cdr. */ | |
5201 | ||
7146af97 | 5202 | Lisp_Object |
971de7fb | 5203 | pure_cons (Lisp_Object car, Lisp_Object cdr) |
7146af97 JB |
5204 | { |
5205 | register Lisp_Object new; | |
1f0b3fd2 | 5206 | struct Lisp_Cons *p; |
7146af97 | 5207 | |
1f0b3fd2 GM |
5208 | p = (struct Lisp_Cons *) pure_alloc (sizeof *p, Lisp_Cons); |
5209 | XSETCONS (new, p); | |
f3fbd155 KR |
5210 | XSETCAR (new, Fpurecopy (car)); |
5211 | XSETCDR (new, Fpurecopy (cdr)); | |
7146af97 JB |
5212 | return new; |
5213 | } | |
5214 | ||
7146af97 | 5215 | |
34400008 GM |
5216 | /* Value is a float object with value NUM allocated from pure space. */ |
5217 | ||
d3d47262 | 5218 | static Lisp_Object |
971de7fb | 5219 | make_pure_float (double num) |
7146af97 JB |
5220 | { |
5221 | register Lisp_Object new; | |
1f0b3fd2 | 5222 | struct Lisp_Float *p; |
7146af97 | 5223 | |
1f0b3fd2 GM |
5224 | p = (struct Lisp_Float *) pure_alloc (sizeof *p, Lisp_Float); |
5225 | XSETFLOAT (new, p); | |
f601cdf3 | 5226 | XFLOAT_INIT (new, num); |
7146af97 JB |
5227 | return new; |
5228 | } | |
5229 | ||
34400008 GM |
5230 | |
5231 | /* Return a vector with room for LEN Lisp_Objects allocated from | |
5232 | pure space. */ | |
5233 | ||
72cb32cf | 5234 | static Lisp_Object |
d311d28c | 5235 | make_pure_vector (ptrdiff_t len) |
7146af97 | 5236 | { |
1f0b3fd2 GM |
5237 | Lisp_Object new; |
5238 | struct Lisp_Vector *p; | |
36372bf9 PE |
5239 | size_t size = (offsetof (struct Lisp_Vector, contents) |
5240 | + len * sizeof (Lisp_Object)); | |
7146af97 | 5241 | |
1f0b3fd2 GM |
5242 | p = (struct Lisp_Vector *) pure_alloc (size, Lisp_Vectorlike); |
5243 | XSETVECTOR (new, p); | |
eab3844f | 5244 | XVECTOR (new)->header.size = len; |
7146af97 JB |
5245 | return new; |
5246 | } | |
5247 | ||
34400008 | 5248 | |
a7ca3326 | 5249 | DEFUN ("purecopy", Fpurecopy, Spurecopy, 1, 1, 0, |
909e3b33 | 5250 | doc: /* Make a copy of object OBJ in pure storage. |
228299fa | 5251 | Recursively copies contents of vectors and cons cells. |
7ee72033 | 5252 | Does not copy symbols. Copies strings without text properties. */) |
5842a27b | 5253 | (register Lisp_Object obj) |
7146af97 | 5254 | { |
265a9e55 | 5255 | if (NILP (Vpurify_flag)) |
7146af97 JB |
5256 | return obj; |
5257 | ||
1f0b3fd2 | 5258 | if (PURE_POINTER_P (XPNTR (obj))) |
7146af97 JB |
5259 | return obj; |
5260 | ||
e9515805 SM |
5261 | if (HASH_TABLE_P (Vpurify_flag)) /* Hash consing. */ |
5262 | { | |
5263 | Lisp_Object tmp = Fgethash (obj, Vpurify_flag, Qnil); | |
5264 | if (!NILP (tmp)) | |
5265 | return tmp; | |
5266 | } | |
5267 | ||
d6dd74bb | 5268 | if (CONSP (obj)) |
e9515805 | 5269 | obj = pure_cons (XCAR (obj), XCDR (obj)); |
d6dd74bb | 5270 | else if (FLOATP (obj)) |
e9515805 | 5271 | obj = make_pure_float (XFLOAT_DATA (obj)); |
d6dd74bb | 5272 | else if (STRINGP (obj)) |
42a5b22f | 5273 | obj = make_pure_string (SSDATA (obj), SCHARS (obj), |
e9515805 SM |
5274 | SBYTES (obj), |
5275 | STRING_MULTIBYTE (obj)); | |
876c194c | 5276 | else if (COMPILEDP (obj) || VECTORP (obj)) |
d6dd74bb KH |
5277 | { |
5278 | register struct Lisp_Vector *vec; | |
d311d28c PE |
5279 | register ptrdiff_t i; |
5280 | ptrdiff_t size; | |
d6dd74bb | 5281 | |
77b37c05 | 5282 | size = ASIZE (obj); |
7d535c68 KH |
5283 | if (size & PSEUDOVECTOR_FLAG) |
5284 | size &= PSEUDOVECTOR_SIZE_MASK; | |
6b61353c | 5285 | vec = XVECTOR (make_pure_vector (size)); |
d6dd74bb | 5286 | for (i = 0; i < size; i++) |
28be1ada | 5287 | vec->contents[i] = Fpurecopy (AREF (obj, i)); |
876c194c | 5288 | if (COMPILEDP (obj)) |
985773c9 | 5289 | { |
876c194c SM |
5290 | XSETPVECTYPE (vec, PVEC_COMPILED); |
5291 | XSETCOMPILED (obj, vec); | |
985773c9 | 5292 | } |
d6dd74bb KH |
5293 | else |
5294 | XSETVECTOR (obj, vec); | |
7146af97 | 5295 | } |
d6dd74bb KH |
5296 | else if (MARKERP (obj)) |
5297 | error ("Attempt to copy a marker to pure storage"); | |
e9515805 SM |
5298 | else |
5299 | /* Not purified, don't hash-cons. */ | |
5300 | return obj; | |
5301 | ||
5302 | if (HASH_TABLE_P (Vpurify_flag)) /* Hash consing. */ | |
5303 | Fputhash (obj, obj, Vpurify_flag); | |
6bbd7a29 GM |
5304 | |
5305 | return obj; | |
7146af97 | 5306 | } |
2e471eb5 | 5307 | |
34400008 | 5308 | |
7146af97 | 5309 | \f |
34400008 GM |
5310 | /*********************************************************************** |
5311 | Protection from GC | |
5312 | ***********************************************************************/ | |
5313 | ||
2e471eb5 GM |
5314 | /* Put an entry in staticvec, pointing at the variable with address |
5315 | VARADDRESS. */ | |
7146af97 JB |
5316 | |
5317 | void | |
971de7fb | 5318 | staticpro (Lisp_Object *varaddress) |
7146af97 JB |
5319 | { |
5320 | staticvec[staticidx++] = varaddress; | |
5321 | if (staticidx >= NSTATICS) | |
5322 | abort (); | |
5323 | } | |
5324 | ||
7146af97 | 5325 | \f |
34400008 GM |
5326 | /*********************************************************************** |
5327 | Protection from GC | |
5328 | ***********************************************************************/ | |
1a4f1e2c | 5329 | |
e8197642 RS |
5330 | /* Temporarily prevent garbage collection. */ |
5331 | ||
d311d28c | 5332 | ptrdiff_t |
971de7fb | 5333 | inhibit_garbage_collection (void) |
e8197642 | 5334 | { |
d311d28c | 5335 | ptrdiff_t count = SPECPDL_INDEX (); |
54defd0d | 5336 | |
6349ae4d | 5337 | specbind (Qgc_cons_threshold, make_number (MOST_POSITIVE_FIXNUM)); |
e8197642 RS |
5338 | return count; |
5339 | } | |
5340 | ||
34400008 | 5341 | |
a7ca3326 | 5342 | DEFUN ("garbage-collect", Fgarbage_collect, Sgarbage_collect, 0, 0, "", |
7ee72033 | 5343 | doc: /* Reclaim storage for Lisp objects no longer needed. |
e1e37596 RS |
5344 | Garbage collection happens automatically if you cons more than |
5345 | `gc-cons-threshold' bytes of Lisp data since previous garbage collection. | |
5346 | `garbage-collect' normally returns a list with info on amount of space in use: | |
228299fa | 5347 | ((USED-CONSES . FREE-CONSES) (USED-SYMS . FREE-SYMS) |
999dd333 | 5348 | (USED-MISCS . FREE-MISCS) USED-STRING-CHARS USED-VECTOR-SLOTS |
228299fa GM |
5349 | (USED-FLOATS . FREE-FLOATS) (USED-INTERVALS . FREE-INTERVALS) |
5350 | (USED-STRINGS . FREE-STRINGS)) | |
e1e37596 | 5351 | However, if there was overflow in pure space, `garbage-collect' |
999dd333 GM |
5352 | returns nil, because real GC can't be done. |
5353 | See Info node `(elisp)Garbage Collection'. */) | |
5842a27b | 5354 | (void) |
7146af97 | 5355 | { |
7146af97 | 5356 | register struct specbinding *bind; |
7146af97 | 5357 | char stack_top_variable; |
f66c7cf8 | 5358 | ptrdiff_t i; |
6efc7df7 | 5359 | int message_p; |
96117bc7 | 5360 | Lisp_Object total[8]; |
d311d28c | 5361 | ptrdiff_t count = SPECPDL_INDEX (); |
2c5bd608 DL |
5362 | EMACS_TIME t1, t2, t3; |
5363 | ||
3de0effb RS |
5364 | if (abort_on_gc) |
5365 | abort (); | |
5366 | ||
9e713715 GM |
5367 | /* Can't GC if pure storage overflowed because we can't determine |
5368 | if something is a pure object or not. */ | |
5369 | if (pure_bytes_used_before_overflow) | |
5370 | return Qnil; | |
5371 | ||
bbc012e0 KS |
5372 | CHECK_CONS_LIST (); |
5373 | ||
3c7e66a8 RS |
5374 | /* Don't keep undo information around forever. |
5375 | Do this early on, so it is no problem if the user quits. */ | |
5376 | { | |
5377 | register struct buffer *nextb = all_buffers; | |
5378 | ||
5379 | while (nextb) | |
5380 | { | |
5381 | /* If a buffer's undo list is Qt, that means that undo is | |
5382 | turned off in that buffer. Calling truncate_undo_list on | |
5383 | Qt tends to return NULL, which effectively turns undo back on. | |
5384 | So don't call truncate_undo_list if undo_list is Qt. */ | |
5d8ea120 | 5385 | if (! NILP (nextb->BUFFER_INTERNAL_FIELD (name)) && ! EQ (nextb->BUFFER_INTERNAL_FIELD (undo_list), Qt)) |
3c7e66a8 RS |
5386 | truncate_undo_list (nextb); |
5387 | ||
5388 | /* Shrink buffer gaps, but skip indirect and dead buffers. */ | |
5d8ea120 | 5389 | if (nextb->base_buffer == 0 && !NILP (nextb->BUFFER_INTERNAL_FIELD (name)) |
dc7b4525 | 5390 | && ! nextb->text->inhibit_shrinking) |
3c7e66a8 RS |
5391 | { |
5392 | /* If a buffer's gap size is more than 10% of the buffer | |
5393 | size, or larger than 2000 bytes, then shrink it | |
5394 | accordingly. Keep a minimum size of 20 bytes. */ | |
5395 | int size = min (2000, max (20, (nextb->text->z_byte / 10))); | |
5396 | ||
5397 | if (nextb->text->gap_size > size) | |
5398 | { | |
5399 | struct buffer *save_current = current_buffer; | |
5400 | current_buffer = nextb; | |
5401 | make_gap (-(nextb->text->gap_size - size)); | |
5402 | current_buffer = save_current; | |
5403 | } | |
5404 | } | |
5405 | ||
eab3844f | 5406 | nextb = nextb->header.next.buffer; |
3c7e66a8 RS |
5407 | } |
5408 | } | |
5409 | ||
5410 | EMACS_GET_TIME (t1); | |
5411 | ||
58595309 KH |
5412 | /* In case user calls debug_print during GC, |
5413 | don't let that cause a recursive GC. */ | |
5414 | consing_since_gc = 0; | |
5415 | ||
6efc7df7 GM |
5416 | /* Save what's currently displayed in the echo area. */ |
5417 | message_p = push_message (); | |
c55b0da6 | 5418 | record_unwind_protect (pop_message_unwind, Qnil); |
41c28a37 | 5419 | |
7146af97 JB |
5420 | /* Save a copy of the contents of the stack, for debugging. */ |
5421 | #if MAX_SAVE_STACK > 0 | |
265a9e55 | 5422 | if (NILP (Vpurify_flag)) |
7146af97 | 5423 | { |
dd3f25f7 | 5424 | char *stack; |
903fe15d | 5425 | ptrdiff_t stack_size; |
dd3f25f7 | 5426 | if (&stack_top_variable < stack_bottom) |
7146af97 | 5427 | { |
dd3f25f7 PE |
5428 | stack = &stack_top_variable; |
5429 | stack_size = stack_bottom - &stack_top_variable; | |
5430 | } | |
5431 | else | |
5432 | { | |
5433 | stack = stack_bottom; | |
5434 | stack_size = &stack_top_variable - stack_bottom; | |
5435 | } | |
5436 | if (stack_size <= MAX_SAVE_STACK) | |
7146af97 | 5437 | { |
dd3f25f7 | 5438 | if (stack_copy_size < stack_size) |
7146af97 | 5439 | { |
dd3f25f7 PE |
5440 | stack_copy = (char *) xrealloc (stack_copy, stack_size); |
5441 | stack_copy_size = stack_size; | |
7146af97 | 5442 | } |
dd3f25f7 | 5443 | memcpy (stack_copy, stack, stack_size); |
7146af97 JB |
5444 | } |
5445 | } | |
5446 | #endif /* MAX_SAVE_STACK > 0 */ | |
5447 | ||
299585ee | 5448 | if (garbage_collection_messages) |
691c4285 | 5449 | message1_nolog ("Garbage collecting..."); |
7146af97 | 5450 | |
6e0fca1d RS |
5451 | BLOCK_INPUT; |
5452 | ||
eec7b73d RS |
5453 | shrink_regexp_cache (); |
5454 | ||
7146af97 JB |
5455 | gc_in_progress = 1; |
5456 | ||
c23baf9f | 5457 | /* clear_marks (); */ |
7146af97 | 5458 | |
005ca5c7 | 5459 | /* Mark all the special slots that serve as the roots of accessibility. */ |
7146af97 JB |
5460 | |
5461 | for (i = 0; i < staticidx; i++) | |
49723c04 | 5462 | mark_object (*staticvec[i]); |
34400008 | 5463 | |
126f9c02 SM |
5464 | for (bind = specpdl; bind != specpdl_ptr; bind++) |
5465 | { | |
5466 | mark_object (bind->symbol); | |
5467 | mark_object (bind->old_value); | |
5468 | } | |
6ed8eeff | 5469 | mark_terminals (); |
126f9c02 | 5470 | mark_kboards (); |
98a92e2d | 5471 | mark_ttys (); |
126f9c02 SM |
5472 | |
5473 | #ifdef USE_GTK | |
5474 | { | |
dd4c5104 | 5475 | extern void xg_mark_data (void); |
126f9c02 SM |
5476 | xg_mark_data (); |
5477 | } | |
5478 | #endif | |
5479 | ||
34400008 GM |
5480 | #if (GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS \ |
5481 | || GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS) | |
5482 | mark_stack (); | |
5483 | #else | |
acf5f7d3 SM |
5484 | { |
5485 | register struct gcpro *tail; | |
5486 | for (tail = gcprolist; tail; tail = tail->next) | |
5487 | for (i = 0; i < tail->nvars; i++) | |
005ca5c7 | 5488 | mark_object (tail->var[i]); |
acf5f7d3 | 5489 | } |
3e21b6a7 | 5490 | mark_byte_stack (); |
b286858c SM |
5491 | { |
5492 | struct catchtag *catch; | |
5493 | struct handler *handler; | |
177c0ea7 | 5494 | |
7146af97 JB |
5495 | for (catch = catchlist; catch; catch = catch->next) |
5496 | { | |
49723c04 SM |
5497 | mark_object (catch->tag); |
5498 | mark_object (catch->val); | |
177c0ea7 | 5499 | } |
7146af97 JB |
5500 | for (handler = handlerlist; handler; handler = handler->next) |
5501 | { | |
49723c04 SM |
5502 | mark_object (handler->handler); |
5503 | mark_object (handler->var); | |
177c0ea7 | 5504 | } |
b286858c | 5505 | } |
b40ea20a | 5506 | mark_backtrace (); |
b286858c | 5507 | #endif |
7146af97 | 5508 | |
454d7973 KS |
5509 | #ifdef HAVE_WINDOW_SYSTEM |
5510 | mark_fringe_data (); | |
5511 | #endif | |
5512 | ||
74c35a48 SM |
5513 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
5514 | mark_stack (); | |
5515 | #endif | |
5516 | ||
c37adf23 SM |
5517 | /* Everything is now marked, except for the things that require special |
5518 | finalization, i.e. the undo_list. | |
5519 | Look thru every buffer's undo list | |
4c315bda RS |
5520 | for elements that update markers that were not marked, |
5521 | and delete them. */ | |
5522 | { | |
5523 | register struct buffer *nextb = all_buffers; | |
5524 | ||
5525 | while (nextb) | |
5526 | { | |
5527 | /* If a buffer's undo list is Qt, that means that undo is | |
5528 | turned off in that buffer. Calling truncate_undo_list on | |
5529 | Qt tends to return NULL, which effectively turns undo back on. | |
5530 | So don't call truncate_undo_list if undo_list is Qt. */ | |
5d8ea120 | 5531 | if (! EQ (nextb->BUFFER_INTERNAL_FIELD (undo_list), Qt)) |
4c315bda RS |
5532 | { |
5533 | Lisp_Object tail, prev; | |
5d8ea120 | 5534 | tail = nextb->BUFFER_INTERNAL_FIELD (undo_list); |
4c315bda RS |
5535 | prev = Qnil; |
5536 | while (CONSP (tail)) | |
5537 | { | |
8e50cc2d SM |
5538 | if (CONSP (XCAR (tail)) |
5539 | && MARKERP (XCAR (XCAR (tail))) | |
2336fe58 | 5540 | && !XMARKER (XCAR (XCAR (tail)))->gcmarkbit) |
4c315bda RS |
5541 | { |
5542 | if (NILP (prev)) | |
5d8ea120 | 5543 | nextb->BUFFER_INTERNAL_FIELD (undo_list) = tail = XCDR (tail); |
4c315bda | 5544 | else |
f3fbd155 KR |
5545 | { |
5546 | tail = XCDR (tail); | |
5547 | XSETCDR (prev, tail); | |
5548 | } | |
4c315bda RS |
5549 | } |
5550 | else | |
5551 | { | |
5552 | prev = tail; | |
70949dac | 5553 | tail = XCDR (tail); |
4c315bda RS |
5554 | } |
5555 | } | |
5556 | } | |
c37adf23 SM |
5557 | /* Now that we have stripped the elements that need not be in the |
5558 | undo_list any more, we can finally mark the list. */ | |
5d8ea120 | 5559 | mark_object (nextb->BUFFER_INTERNAL_FIELD (undo_list)); |
4c315bda | 5560 | |
eab3844f | 5561 | nextb = nextb->header.next.buffer; |
4c315bda RS |
5562 | } |
5563 | } | |
5564 | ||
7146af97 JB |
5565 | gc_sweep (); |
5566 | ||
5567 | /* Clear the mark bits that we set in certain root slots. */ | |
5568 | ||
033a5fa3 | 5569 | unmark_byte_stack (); |
3ef06d12 SM |
5570 | VECTOR_UNMARK (&buffer_defaults); |
5571 | VECTOR_UNMARK (&buffer_local_symbols); | |
7146af97 | 5572 | |
34400008 GM |
5573 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES && 0 |
5574 | dump_zombies (); | |
5575 | #endif | |
5576 | ||
6e0fca1d RS |
5577 | UNBLOCK_INPUT; |
5578 | ||
bbc012e0 KS |
5579 | CHECK_CONS_LIST (); |
5580 | ||
c23baf9f | 5581 | /* clear_marks (); */ |
7146af97 JB |
5582 | gc_in_progress = 0; |
5583 | ||
5584 | consing_since_gc = 0; | |
5585 | if (gc_cons_threshold < 10000) | |
5586 | gc_cons_threshold = 10000; | |
5587 | ||
c0c5c8ae | 5588 | gc_relative_threshold = 0; |
96f077ad SM |
5589 | if (FLOATP (Vgc_cons_percentage)) |
5590 | { /* Set gc_cons_combined_threshold. */ | |
c0c5c8ae | 5591 | double tot = 0; |
ae35e756 PE |
5592 | |
5593 | tot += total_conses * sizeof (struct Lisp_Cons); | |
5594 | tot += total_symbols * sizeof (struct Lisp_Symbol); | |
5595 | tot += total_markers * sizeof (union Lisp_Misc); | |
5596 | tot += total_string_size; | |
5597 | tot += total_vector_size * sizeof (Lisp_Object); | |
5598 | tot += total_floats * sizeof (struct Lisp_Float); | |
5599 | tot += total_intervals * sizeof (struct interval); | |
5600 | tot += total_strings * sizeof (struct Lisp_String); | |
5601 | ||
c0c5c8ae PE |
5602 | tot *= XFLOAT_DATA (Vgc_cons_percentage); |
5603 | if (0 < tot) | |
5604 | { | |
5605 | if (tot < TYPE_MAXIMUM (EMACS_INT)) | |
5606 | gc_relative_threshold = tot; | |
5607 | else | |
5608 | gc_relative_threshold = TYPE_MAXIMUM (EMACS_INT); | |
5609 | } | |
96f077ad SM |
5610 | } |
5611 | ||
299585ee RS |
5612 | if (garbage_collection_messages) |
5613 | { | |
6efc7df7 GM |
5614 | if (message_p || minibuf_level > 0) |
5615 | restore_message (); | |
299585ee RS |
5616 | else |
5617 | message1_nolog ("Garbage collecting...done"); | |
5618 | } | |
7146af97 | 5619 | |
98edb5ff | 5620 | unbind_to (count, Qnil); |
2e471eb5 GM |
5621 | |
5622 | total[0] = Fcons (make_number (total_conses), | |
5623 | make_number (total_free_conses)); | |
5624 | total[1] = Fcons (make_number (total_symbols), | |
5625 | make_number (total_free_symbols)); | |
5626 | total[2] = Fcons (make_number (total_markers), | |
5627 | make_number (total_free_markers)); | |
96117bc7 GM |
5628 | total[3] = make_number (total_string_size); |
5629 | total[4] = make_number (total_vector_size); | |
5630 | total[5] = Fcons (make_number (total_floats), | |
2e471eb5 | 5631 | make_number (total_free_floats)); |
96117bc7 | 5632 | total[6] = Fcons (make_number (total_intervals), |
2e471eb5 | 5633 | make_number (total_free_intervals)); |
96117bc7 | 5634 | total[7] = Fcons (make_number (total_strings), |
2e471eb5 GM |
5635 | make_number (total_free_strings)); |
5636 | ||
34400008 | 5637 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
7146af97 | 5638 | { |
34400008 GM |
5639 | /* Compute average percentage of zombies. */ |
5640 | double nlive = 0; | |
177c0ea7 | 5641 | |
34400008 | 5642 | for (i = 0; i < 7; ++i) |
83fc9c63 DL |
5643 | if (CONSP (total[i])) |
5644 | nlive += XFASTINT (XCAR (total[i])); | |
34400008 GM |
5645 | |
5646 | avg_live = (avg_live * ngcs + nlive) / (ngcs + 1); | |
5647 | max_live = max (nlive, max_live); | |
5648 | avg_zombies = (avg_zombies * ngcs + nzombies) / (ngcs + 1); | |
5649 | max_zombies = max (nzombies, max_zombies); | |
5650 | ++ngcs; | |
5651 | } | |
5652 | #endif | |
7146af97 | 5653 | |
9e713715 GM |
5654 | if (!NILP (Vpost_gc_hook)) |
5655 | { | |
d311d28c | 5656 | ptrdiff_t gc_count = inhibit_garbage_collection (); |
9e713715 | 5657 | safe_run_hooks (Qpost_gc_hook); |
ae35e756 | 5658 | unbind_to (gc_count, Qnil); |
9e713715 | 5659 | } |
2c5bd608 DL |
5660 | |
5661 | /* Accumulate statistics. */ | |
2c5bd608 | 5662 | if (FLOATP (Vgc_elapsed)) |
d35af63c PE |
5663 | { |
5664 | EMACS_GET_TIME (t2); | |
5665 | EMACS_SUB_TIME (t3, t2, t1); | |
5666 | Vgc_elapsed = make_float (XFLOAT_DATA (Vgc_elapsed) | |
5667 | + EMACS_TIME_TO_DOUBLE (t3)); | |
5668 | } | |
5669 | ||
2c5bd608 DL |
5670 | gcs_done++; |
5671 | ||
96117bc7 | 5672 | return Flist (sizeof total / sizeof *total, total); |
7146af97 | 5673 | } |
34400008 | 5674 | |
41c28a37 | 5675 | |
3770920e GM |
5676 | /* Mark Lisp objects in glyph matrix MATRIX. Currently the |
5677 | only interesting objects referenced from glyphs are strings. */ | |
41c28a37 GM |
5678 | |
5679 | static void | |
971de7fb | 5680 | mark_glyph_matrix (struct glyph_matrix *matrix) |
41c28a37 GM |
5681 | { |
5682 | struct glyph_row *row = matrix->rows; | |
5683 | struct glyph_row *end = row + matrix->nrows; | |
5684 | ||
2e471eb5 GM |
5685 | for (; row < end; ++row) |
5686 | if (row->enabled_p) | |
5687 | { | |
5688 | int area; | |
5689 | for (area = LEFT_MARGIN_AREA; area < LAST_AREA; ++area) | |
5690 | { | |
5691 | struct glyph *glyph = row->glyphs[area]; | |
5692 | struct glyph *end_glyph = glyph + row->used[area]; | |
177c0ea7 | 5693 | |
2e471eb5 | 5694 | for (; glyph < end_glyph; ++glyph) |
8e50cc2d | 5695 | if (STRINGP (glyph->object) |
2e471eb5 | 5696 | && !STRING_MARKED_P (XSTRING (glyph->object))) |
49723c04 | 5697 | mark_object (glyph->object); |
2e471eb5 GM |
5698 | } |
5699 | } | |
41c28a37 GM |
5700 | } |
5701 | ||
34400008 | 5702 | |
41c28a37 GM |
5703 | /* Mark Lisp faces in the face cache C. */ |
5704 | ||
5705 | static void | |
971de7fb | 5706 | mark_face_cache (struct face_cache *c) |
41c28a37 GM |
5707 | { |
5708 | if (c) | |
5709 | { | |
5710 | int i, j; | |
5711 | for (i = 0; i < c->used; ++i) | |
5712 | { | |
5713 | struct face *face = FACE_FROM_ID (c->f, i); | |
5714 | ||
5715 | if (face) | |
5716 | { | |
5717 | for (j = 0; j < LFACE_VECTOR_SIZE; ++j) | |
49723c04 | 5718 | mark_object (face->lface[j]); |
41c28a37 GM |
5719 | } |
5720 | } | |
5721 | } | |
5722 | } | |
5723 | ||
5724 | ||
7146af97 | 5725 | \f |
1a4f1e2c | 5726 | /* Mark reference to a Lisp_Object. |
2e471eb5 GM |
5727 | If the object referred to has not been seen yet, recursively mark |
5728 | all the references contained in it. */ | |
7146af97 | 5729 | |
785cd37f | 5730 | #define LAST_MARKED_SIZE 500 |
d3d47262 | 5731 | static Lisp_Object last_marked[LAST_MARKED_SIZE]; |
244ed907 | 5732 | static int last_marked_index; |
785cd37f | 5733 | |
1342fc6f RS |
5734 | /* For debugging--call abort when we cdr down this many |
5735 | links of a list, in mark_object. In debugging, | |
5736 | the call to abort will hit a breakpoint. | |
5737 | Normally this is zero and the check never goes off. */ | |
903fe15d | 5738 | ptrdiff_t mark_object_loop_halt EXTERNALLY_VISIBLE; |
1342fc6f | 5739 | |
8f11f7ec | 5740 | static void |
971de7fb | 5741 | mark_vectorlike (struct Lisp_Vector *ptr) |
d2029e5b | 5742 | { |
d311d28c PE |
5743 | ptrdiff_t size = ptr->header.size; |
5744 | ptrdiff_t i; | |
d2029e5b | 5745 | |
8f11f7ec | 5746 | eassert (!VECTOR_MARKED_P (ptr)); |
d2029e5b SM |
5747 | VECTOR_MARK (ptr); /* Else mark it */ |
5748 | if (size & PSEUDOVECTOR_FLAG) | |
5749 | size &= PSEUDOVECTOR_SIZE_MASK; | |
d3d47262 | 5750 | |
d2029e5b SM |
5751 | /* Note that this size is not the memory-footprint size, but only |
5752 | the number of Lisp_Object fields that we should trace. | |
5753 | The distinction is used e.g. by Lisp_Process which places extra | |
5754 | non-Lisp_Object fields at the end of the structure. */ | |
5755 | for (i = 0; i < size; i++) /* and then mark its elements */ | |
5756 | mark_object (ptr->contents[i]); | |
d2029e5b SM |
5757 | } |
5758 | ||
58026347 KH |
5759 | /* Like mark_vectorlike but optimized for char-tables (and |
5760 | sub-char-tables) assuming that the contents are mostly integers or | |
5761 | symbols. */ | |
5762 | ||
5763 | static void | |
971de7fb | 5764 | mark_char_table (struct Lisp_Vector *ptr) |
58026347 | 5765 | { |
b6439961 PE |
5766 | int size = ptr->header.size & PSEUDOVECTOR_SIZE_MASK; |
5767 | int i; | |
58026347 | 5768 | |
8f11f7ec | 5769 | eassert (!VECTOR_MARKED_P (ptr)); |
58026347 KH |
5770 | VECTOR_MARK (ptr); |
5771 | for (i = 0; i < size; i++) | |
5772 | { | |
5773 | Lisp_Object val = ptr->contents[i]; | |
5774 | ||
ef1b0ba7 | 5775 | if (INTEGERP (val) || (SYMBOLP (val) && XSYMBOL (val)->gcmarkbit)) |
58026347 KH |
5776 | continue; |
5777 | if (SUB_CHAR_TABLE_P (val)) | |
5778 | { | |
5779 | if (! VECTOR_MARKED_P (XVECTOR (val))) | |
5780 | mark_char_table (XVECTOR (val)); | |
5781 | } | |
5782 | else | |
5783 | mark_object (val); | |
5784 | } | |
5785 | } | |
5786 | ||
41c28a37 | 5787 | void |
971de7fb | 5788 | mark_object (Lisp_Object arg) |
7146af97 | 5789 | { |
49723c04 | 5790 | register Lisp_Object obj = arg; |
4f5c1376 GM |
5791 | #ifdef GC_CHECK_MARKED_OBJECTS |
5792 | void *po; | |
5793 | struct mem_node *m; | |
5794 | #endif | |
903fe15d | 5795 | ptrdiff_t cdr_count = 0; |
7146af97 | 5796 | |
9149e743 | 5797 | loop: |
7146af97 | 5798 | |
1f0b3fd2 | 5799 | if (PURE_POINTER_P (XPNTR (obj))) |
7146af97 JB |
5800 | return; |
5801 | ||
49723c04 | 5802 | last_marked[last_marked_index++] = obj; |
785cd37f RS |
5803 | if (last_marked_index == LAST_MARKED_SIZE) |
5804 | last_marked_index = 0; | |
5805 | ||
4f5c1376 GM |
5806 | /* Perform some sanity checks on the objects marked here. Abort if |
5807 | we encounter an object we know is bogus. This increases GC time | |
5808 | by ~80%, and requires compilation with GC_MARK_STACK != 0. */ | |
5809 | #ifdef GC_CHECK_MARKED_OBJECTS | |
5810 | ||
5811 | po = (void *) XPNTR (obj); | |
5812 | ||
5813 | /* Check that the object pointed to by PO is known to be a Lisp | |
5814 | structure allocated from the heap. */ | |
5815 | #define CHECK_ALLOCATED() \ | |
5816 | do { \ | |
5817 | m = mem_find (po); \ | |
5818 | if (m == MEM_NIL) \ | |
5819 | abort (); \ | |
5820 | } while (0) | |
5821 | ||
5822 | /* Check that the object pointed to by PO is live, using predicate | |
5823 | function LIVEP. */ | |
5824 | #define CHECK_LIVE(LIVEP) \ | |
5825 | do { \ | |
5826 | if (!LIVEP (m, po)) \ | |
5827 | abort (); \ | |
5828 | } while (0) | |
5829 | ||
5830 | /* Check both of the above conditions. */ | |
5831 | #define CHECK_ALLOCATED_AND_LIVE(LIVEP) \ | |
5832 | do { \ | |
5833 | CHECK_ALLOCATED (); \ | |
5834 | CHECK_LIVE (LIVEP); \ | |
5835 | } while (0) \ | |
177c0ea7 | 5836 | |
4f5c1376 | 5837 | #else /* not GC_CHECK_MARKED_OBJECTS */ |
177c0ea7 | 5838 | |
4f5c1376 GM |
5839 | #define CHECK_LIVE(LIVEP) (void) 0 |
5840 | #define CHECK_ALLOCATED_AND_LIVE(LIVEP) (void) 0 | |
177c0ea7 | 5841 | |
4f5c1376 GM |
5842 | #endif /* not GC_CHECK_MARKED_OBJECTS */ |
5843 | ||
8e50cc2d | 5844 | switch (SWITCH_ENUM_CAST (XTYPE (obj))) |
7146af97 JB |
5845 | { |
5846 | case Lisp_String: | |
5847 | { | |
5848 | register struct Lisp_String *ptr = XSTRING (obj); | |
8f11f7ec SM |
5849 | if (STRING_MARKED_P (ptr)) |
5850 | break; | |
4f5c1376 | 5851 | CHECK_ALLOCATED_AND_LIVE (live_string_p); |
d5e35230 | 5852 | MARK_INTERVAL_TREE (ptr->intervals); |
2e471eb5 | 5853 | MARK_STRING (ptr); |
361b097f | 5854 | #ifdef GC_CHECK_STRING_BYTES |
676a7251 GM |
5855 | /* Check that the string size recorded in the string is the |
5856 | same as the one recorded in the sdata structure. */ | |
5857 | CHECK_STRING_BYTES (ptr); | |
361b097f | 5858 | #endif /* GC_CHECK_STRING_BYTES */ |
7146af97 JB |
5859 | } |
5860 | break; | |
5861 | ||
76437631 | 5862 | case Lisp_Vectorlike: |
8f11f7ec SM |
5863 | if (VECTOR_MARKED_P (XVECTOR (obj))) |
5864 | break; | |
4f5c1376 GM |
5865 | #ifdef GC_CHECK_MARKED_OBJECTS |
5866 | m = mem_find (po); | |
8e50cc2d | 5867 | if (m == MEM_NIL && !SUBRP (obj) |
4f5c1376 GM |
5868 | && po != &buffer_defaults |
5869 | && po != &buffer_local_symbols) | |
5870 | abort (); | |
5871 | #endif /* GC_CHECK_MARKED_OBJECTS */ | |
177c0ea7 | 5872 | |
8e50cc2d | 5873 | if (BUFFERP (obj)) |
6b552283 | 5874 | { |
4f5c1376 | 5875 | #ifdef GC_CHECK_MARKED_OBJECTS |
8f11f7ec SM |
5876 | if (po != &buffer_defaults && po != &buffer_local_symbols) |
5877 | { | |
5878 | struct buffer *b; | |
179dade4 | 5879 | for (b = all_buffers; b && b != po; b = b->header.next.buffer) |
8f11f7ec SM |
5880 | ; |
5881 | if (b == NULL) | |
5882 | abort (); | |
4f5c1376 | 5883 | } |
8f11f7ec SM |
5884 | #endif /* GC_CHECK_MARKED_OBJECTS */ |
5885 | mark_buffer (obj); | |
6b552283 | 5886 | } |
8e50cc2d | 5887 | else if (SUBRP (obj)) |
169ee243 | 5888 | break; |
876c194c | 5889 | else if (COMPILEDP (obj)) |
2e471eb5 GM |
5890 | /* We could treat this just like a vector, but it is better to |
5891 | save the COMPILED_CONSTANTS element for last and avoid | |
5892 | recursion there. */ | |
169ee243 RS |
5893 | { |
5894 | register struct Lisp_Vector *ptr = XVECTOR (obj); | |
b6439961 PE |
5895 | int size = ptr->header.size & PSEUDOVECTOR_SIZE_MASK; |
5896 | int i; | |
169ee243 | 5897 | |
4f5c1376 | 5898 | CHECK_LIVE (live_vector_p); |
3ef06d12 | 5899 | VECTOR_MARK (ptr); /* Else mark it */ |
169ee243 RS |
5900 | for (i = 0; i < size; i++) /* and then mark its elements */ |
5901 | { | |
5902 | if (i != COMPILED_CONSTANTS) | |
49723c04 | 5903 | mark_object (ptr->contents[i]); |
169ee243 | 5904 | } |
49723c04 | 5905 | obj = ptr->contents[COMPILED_CONSTANTS]; |
169ee243 RS |
5906 | goto loop; |
5907 | } | |
8e50cc2d | 5908 | else if (FRAMEP (obj)) |
169ee243 | 5909 | { |
c70bbf06 | 5910 | register struct frame *ptr = XFRAME (obj); |
8f11f7ec SM |
5911 | mark_vectorlike (XVECTOR (obj)); |
5912 | mark_face_cache (ptr->face_cache); | |
707788bd | 5913 | } |
8e50cc2d | 5914 | else if (WINDOWP (obj)) |
41c28a37 GM |
5915 | { |
5916 | register struct Lisp_Vector *ptr = XVECTOR (obj); | |
5917 | struct window *w = XWINDOW (obj); | |
8f11f7ec SM |
5918 | mark_vectorlike (ptr); |
5919 | /* Mark glyphs for leaf windows. Marking window matrices is | |
5920 | sufficient because frame matrices use the same glyph | |
5921 | memory. */ | |
5922 | if (NILP (w->hchild) | |
5923 | && NILP (w->vchild) | |
5924 | && w->current_matrix) | |
41c28a37 | 5925 | { |
8f11f7ec SM |
5926 | mark_glyph_matrix (w->current_matrix); |
5927 | mark_glyph_matrix (w->desired_matrix); | |
41c28a37 GM |
5928 | } |
5929 | } | |
8e50cc2d | 5930 | else if (HASH_TABLE_P (obj)) |
41c28a37 GM |
5931 | { |
5932 | struct Lisp_Hash_Table *h = XHASH_TABLE (obj); | |
8f11f7ec SM |
5933 | mark_vectorlike ((struct Lisp_Vector *)h); |
5934 | /* If hash table is not weak, mark all keys and values. | |
5935 | For weak tables, mark only the vector. */ | |
5936 | if (NILP (h->weak)) | |
5937 | mark_object (h->key_and_value); | |
5938 | else | |
5939 | VECTOR_MARK (XVECTOR (h->key_and_value)); | |
41c28a37 | 5940 | } |
58026347 | 5941 | else if (CHAR_TABLE_P (obj)) |
8f11f7ec | 5942 | mark_char_table (XVECTOR (obj)); |
04ff9756 | 5943 | else |
d2029e5b | 5944 | mark_vectorlike (XVECTOR (obj)); |
169ee243 | 5945 | break; |
7146af97 | 5946 | |
7146af97 JB |
5947 | case Lisp_Symbol: |
5948 | { | |
c70bbf06 | 5949 | register struct Lisp_Symbol *ptr = XSYMBOL (obj); |
7146af97 JB |
5950 | struct Lisp_Symbol *ptrx; |
5951 | ||
8f11f7ec SM |
5952 | if (ptr->gcmarkbit) |
5953 | break; | |
4f5c1376 | 5954 | CHECK_ALLOCATED_AND_LIVE (live_symbol_p); |
2336fe58 | 5955 | ptr->gcmarkbit = 1; |
49723c04 SM |
5956 | mark_object (ptr->function); |
5957 | mark_object (ptr->plist); | |
ce5b453a SM |
5958 | switch (ptr->redirect) |
5959 | { | |
5960 | case SYMBOL_PLAINVAL: mark_object (SYMBOL_VAL (ptr)); break; | |
5961 | case SYMBOL_VARALIAS: | |
5962 | { | |
5963 | Lisp_Object tem; | |
5964 | XSETSYMBOL (tem, SYMBOL_ALIAS (ptr)); | |
5965 | mark_object (tem); | |
5966 | break; | |
5967 | } | |
5968 | case SYMBOL_LOCALIZED: | |
5969 | { | |
5970 | struct Lisp_Buffer_Local_Value *blv = SYMBOL_BLV (ptr); | |
5971 | /* If the value is forwarded to a buffer or keyboard field, | |
5972 | these are marked when we see the corresponding object. | |
5973 | And if it's forwarded to a C variable, either it's not | |
5974 | a Lisp_Object var, or it's staticpro'd already. */ | |
5975 | mark_object (blv->where); | |
5976 | mark_object (blv->valcell); | |
5977 | mark_object (blv->defcell); | |
5978 | break; | |
5979 | } | |
5980 | case SYMBOL_FORWARDED: | |
5981 | /* If the value is forwarded to a buffer or keyboard field, | |
5982 | these are marked when we see the corresponding object. | |
5983 | And if it's forwarded to a C variable, either it's not | |
5984 | a Lisp_Object var, or it's staticpro'd already. */ | |
5985 | break; | |
5986 | default: abort (); | |
5987 | } | |
8fe5665d KR |
5988 | if (!PURE_POINTER_P (XSTRING (ptr->xname))) |
5989 | MARK_STRING (XSTRING (ptr->xname)); | |
d5db4077 | 5990 | MARK_INTERVAL_TREE (STRING_INTERVALS (ptr->xname)); |
177c0ea7 | 5991 | |
7146af97 JB |
5992 | ptr = ptr->next; |
5993 | if (ptr) | |
5994 | { | |
b0846f52 | 5995 | ptrx = ptr; /* Use of ptrx avoids compiler bug on Sun */ |
7146af97 | 5996 | XSETSYMBOL (obj, ptrx); |
49723c04 | 5997 | goto loop; |
7146af97 JB |
5998 | } |
5999 | } | |
6000 | break; | |
6001 | ||
a0a38eb7 | 6002 | case Lisp_Misc: |
4f5c1376 | 6003 | CHECK_ALLOCATED_AND_LIVE (live_misc_p); |
67ee9f6e | 6004 | if (XMISCANY (obj)->gcmarkbit) |
2336fe58 | 6005 | break; |
67ee9f6e | 6006 | XMISCANY (obj)->gcmarkbit = 1; |
b766f870 | 6007 | |
a5da44fe | 6008 | switch (XMISCTYPE (obj)) |
a0a38eb7 | 6009 | { |
465edf35 | 6010 | |
2336fe58 SM |
6011 | case Lisp_Misc_Marker: |
6012 | /* DO NOT mark thru the marker's chain. | |
6013 | The buffer's markers chain does not preserve markers from gc; | |
6014 | instead, markers are removed from the chain when freed by gc. */ | |
b766f870 KS |
6015 | break; |
6016 | ||
8f924df7 | 6017 | case Lisp_Misc_Save_Value: |
9ea306d1 | 6018 | #if GC_MARK_STACK |
b766f870 KS |
6019 | { |
6020 | register struct Lisp_Save_Value *ptr = XSAVE_VALUE (obj); | |
6021 | /* If DOGC is set, POINTER is the address of a memory | |
6022 | area containing INTEGER potential Lisp_Objects. */ | |
6023 | if (ptr->dogc) | |
6024 | { | |
6025 | Lisp_Object *p = (Lisp_Object *) ptr->pointer; | |
9c4c5f81 | 6026 | ptrdiff_t nelt; |
b766f870 KS |
6027 | for (nelt = ptr->integer; nelt > 0; nelt--, p++) |
6028 | mark_maybe_object (*p); | |
6029 | } | |
6030 | } | |
9ea306d1 | 6031 | #endif |
c8616056 KH |
6032 | break; |
6033 | ||
e202fa34 KH |
6034 | case Lisp_Misc_Overlay: |
6035 | { | |
6036 | struct Lisp_Overlay *ptr = XOVERLAY (obj); | |
49723c04 SM |
6037 | mark_object (ptr->start); |
6038 | mark_object (ptr->end); | |
f54253ec SM |
6039 | mark_object (ptr->plist); |
6040 | if (ptr->next) | |
6041 | { | |
6042 | XSETMISC (obj, ptr->next); | |
6043 | goto loop; | |
6044 | } | |
e202fa34 KH |
6045 | } |
6046 | break; | |
6047 | ||
a0a38eb7 KH |
6048 | default: |
6049 | abort (); | |
6050 | } | |
7146af97 JB |
6051 | break; |
6052 | ||
6053 | case Lisp_Cons: | |
7146af97 JB |
6054 | { |
6055 | register struct Lisp_Cons *ptr = XCONS (obj); | |
8f11f7ec SM |
6056 | if (CONS_MARKED_P (ptr)) |
6057 | break; | |
4f5c1376 | 6058 | CHECK_ALLOCATED_AND_LIVE (live_cons_p); |
08b7c2cb | 6059 | CONS_MARK (ptr); |
c54ca951 | 6060 | /* If the cdr is nil, avoid recursion for the car. */ |
28a099a4 | 6061 | if (EQ (ptr->u.cdr, Qnil)) |
c54ca951 | 6062 | { |
49723c04 | 6063 | obj = ptr->car; |
1342fc6f | 6064 | cdr_count = 0; |
c54ca951 RS |
6065 | goto loop; |
6066 | } | |
49723c04 | 6067 | mark_object (ptr->car); |
28a099a4 | 6068 | obj = ptr->u.cdr; |
1342fc6f RS |
6069 | cdr_count++; |
6070 | if (cdr_count == mark_object_loop_halt) | |
6071 | abort (); | |
7146af97 JB |
6072 | goto loop; |
6073 | } | |
6074 | ||
7146af97 | 6075 | case Lisp_Float: |
4f5c1376 | 6076 | CHECK_ALLOCATED_AND_LIVE (live_float_p); |
ab6780cd | 6077 | FLOAT_MARK (XFLOAT (obj)); |
7146af97 | 6078 | break; |
7146af97 | 6079 | |
2de9f71c | 6080 | case_Lisp_Int: |
7146af97 JB |
6081 | break; |
6082 | ||
6083 | default: | |
6084 | abort (); | |
6085 | } | |
4f5c1376 GM |
6086 | |
6087 | #undef CHECK_LIVE | |
6088 | #undef CHECK_ALLOCATED | |
6089 | #undef CHECK_ALLOCATED_AND_LIVE | |
7146af97 JB |
6090 | } |
6091 | ||
6092 | /* Mark the pointers in a buffer structure. */ | |
6093 | ||
6094 | static void | |
971de7fb | 6095 | mark_buffer (Lisp_Object buf) |
7146af97 | 6096 | { |
7146af97 | 6097 | register struct buffer *buffer = XBUFFER (buf); |
f54253ec | 6098 | register Lisp_Object *ptr, tmp; |
30e3190a | 6099 | Lisp_Object base_buffer; |
7146af97 | 6100 | |
8f11f7ec | 6101 | eassert (!VECTOR_MARKED_P (buffer)); |
3ef06d12 | 6102 | VECTOR_MARK (buffer); |
7146af97 | 6103 | |
30e3190a | 6104 | MARK_INTERVAL_TREE (BUF_INTERVALS (buffer)); |
d5e35230 | 6105 | |
c37adf23 SM |
6106 | /* For now, we just don't mark the undo_list. It's done later in |
6107 | a special way just before the sweep phase, and after stripping | |
6108 | some of its elements that are not needed any more. */ | |
4c315bda | 6109 | |
f54253ec SM |
6110 | if (buffer->overlays_before) |
6111 | { | |
6112 | XSETMISC (tmp, buffer->overlays_before); | |
6113 | mark_object (tmp); | |
6114 | } | |
6115 | if (buffer->overlays_after) | |
6116 | { | |
6117 | XSETMISC (tmp, buffer->overlays_after); | |
6118 | mark_object (tmp); | |
6119 | } | |
6120 | ||
9ce376f9 SM |
6121 | /* buffer-local Lisp variables start at `undo_list', |
6122 | tho only the ones from `name' on are GC'd normally. */ | |
5d8ea120 | 6123 | for (ptr = &buffer->BUFFER_INTERNAL_FIELD (name); |
8a5c77bb PE |
6124 | ptr <= &PER_BUFFER_VALUE (buffer, |
6125 | PER_BUFFER_VAR_OFFSET (LAST_FIELD_PER_BUFFER)); | |
7146af97 | 6126 | ptr++) |
49723c04 | 6127 | mark_object (*ptr); |
30e3190a RS |
6128 | |
6129 | /* If this is an indirect buffer, mark its base buffer. */ | |
349bd9ed | 6130 | if (buffer->base_buffer && !VECTOR_MARKED_P (buffer->base_buffer)) |
30e3190a | 6131 | { |
177c0ea7 | 6132 | XSETBUFFER (base_buffer, buffer->base_buffer); |
30e3190a RS |
6133 | mark_buffer (base_buffer); |
6134 | } | |
7146af97 | 6135 | } |
084b1a0c | 6136 | |
4a729fd8 | 6137 | /* Mark the Lisp pointers in the terminal objects. |
0ba2624f | 6138 | Called by Fgarbage_collect. */ |
4a729fd8 | 6139 | |
4a729fd8 SM |
6140 | static void |
6141 | mark_terminals (void) | |
6142 | { | |
6143 | struct terminal *t; | |
6144 | for (t = terminal_list; t; t = t->next_terminal) | |
6145 | { | |
6146 | eassert (t->name != NULL); | |
354884c4 | 6147 | #ifdef HAVE_WINDOW_SYSTEM |
96ad0af7 YM |
6148 | /* If a terminal object is reachable from a stacpro'ed object, |
6149 | it might have been marked already. Make sure the image cache | |
6150 | gets marked. */ | |
6151 | mark_image_cache (t->image_cache); | |
354884c4 | 6152 | #endif /* HAVE_WINDOW_SYSTEM */ |
96ad0af7 YM |
6153 | if (!VECTOR_MARKED_P (t)) |
6154 | mark_vectorlike ((struct Lisp_Vector *)t); | |
4a729fd8 SM |
6155 | } |
6156 | } | |
6157 | ||
6158 | ||
084b1a0c | 6159 | |
41c28a37 GM |
6160 | /* Value is non-zero if OBJ will survive the current GC because it's |
6161 | either marked or does not need to be marked to survive. */ | |
6162 | ||
6163 | int | |
971de7fb | 6164 | survives_gc_p (Lisp_Object obj) |
41c28a37 GM |
6165 | { |
6166 | int survives_p; | |
177c0ea7 | 6167 | |
8e50cc2d | 6168 | switch (XTYPE (obj)) |
41c28a37 | 6169 | { |
2de9f71c | 6170 | case_Lisp_Int: |
41c28a37 GM |
6171 | survives_p = 1; |
6172 | break; | |
6173 | ||
6174 | case Lisp_Symbol: | |
2336fe58 | 6175 | survives_p = XSYMBOL (obj)->gcmarkbit; |
41c28a37 GM |
6176 | break; |
6177 | ||
6178 | case Lisp_Misc: | |
67ee9f6e | 6179 | survives_p = XMISCANY (obj)->gcmarkbit; |
41c28a37 GM |
6180 | break; |
6181 | ||
6182 | case Lisp_String: | |
08b7c2cb | 6183 | survives_p = STRING_MARKED_P (XSTRING (obj)); |
41c28a37 GM |
6184 | break; |
6185 | ||
6186 | case Lisp_Vectorlike: | |
8e50cc2d | 6187 | survives_p = SUBRP (obj) || VECTOR_MARKED_P (XVECTOR (obj)); |
41c28a37 GM |
6188 | break; |
6189 | ||
6190 | case Lisp_Cons: | |
08b7c2cb | 6191 | survives_p = CONS_MARKED_P (XCONS (obj)); |
41c28a37 GM |
6192 | break; |
6193 | ||
41c28a37 | 6194 | case Lisp_Float: |
ab6780cd | 6195 | survives_p = FLOAT_MARKED_P (XFLOAT (obj)); |
41c28a37 | 6196 | break; |
41c28a37 GM |
6197 | |
6198 | default: | |
6199 | abort (); | |
6200 | } | |
6201 | ||
34400008 | 6202 | return survives_p || PURE_POINTER_P ((void *) XPNTR (obj)); |
41c28a37 GM |
6203 | } |
6204 | ||
6205 | ||
7146af97 | 6206 | \f |
1a4f1e2c | 6207 | /* Sweep: find all structures not marked, and free them. */ |
7146af97 JB |
6208 | |
6209 | static void | |
971de7fb | 6210 | gc_sweep (void) |
7146af97 | 6211 | { |
41c28a37 GM |
6212 | /* Remove or mark entries in weak hash tables. |
6213 | This must be done before any object is unmarked. */ | |
6214 | sweep_weak_hash_tables (); | |
6215 | ||
2e471eb5 | 6216 | sweep_strings (); |
676a7251 GM |
6217 | #ifdef GC_CHECK_STRING_BYTES |
6218 | if (!noninteractive) | |
6219 | check_string_bytes (1); | |
6220 | #endif | |
7146af97 JB |
6221 | |
6222 | /* Put all unmarked conses on free list */ | |
6223 | { | |
6224 | register struct cons_block *cblk; | |
6ca94ac9 | 6225 | struct cons_block **cprev = &cons_block; |
7146af97 | 6226 | register int lim = cons_block_index; |
c0c5c8ae | 6227 | EMACS_INT num_free = 0, num_used = 0; |
7146af97 JB |
6228 | |
6229 | cons_free_list = 0; | |
177c0ea7 | 6230 | |
6ca94ac9 | 6231 | for (cblk = cons_block; cblk; cblk = *cprev) |
7146af97 | 6232 | { |
3ae2e3a3 | 6233 | register int i = 0; |
6ca94ac9 | 6234 | int this_free = 0; |
3ae2e3a3 RS |
6235 | int ilim = (lim + BITS_PER_INT - 1) / BITS_PER_INT; |
6236 | ||
6237 | /* Scan the mark bits an int at a time. */ | |
47ea7f44 | 6238 | for (i = 0; i < ilim; i++) |
3ae2e3a3 RS |
6239 | { |
6240 | if (cblk->gcmarkbits[i] == -1) | |
6241 | { | |
6242 | /* Fast path - all cons cells for this int are marked. */ | |
6243 | cblk->gcmarkbits[i] = 0; | |
6244 | num_used += BITS_PER_INT; | |
6245 | } | |
6246 | else | |
6247 | { | |
6248 | /* Some cons cells for this int are not marked. | |
6249 | Find which ones, and free them. */ | |
6250 | int start, pos, stop; | |
6251 | ||
6252 | start = i * BITS_PER_INT; | |
6253 | stop = lim - start; | |
6254 | if (stop > BITS_PER_INT) | |
6255 | stop = BITS_PER_INT; | |
6256 | stop += start; | |
6257 | ||
6258 | for (pos = start; pos < stop; pos++) | |
6259 | { | |
6260 | if (!CONS_MARKED_P (&cblk->conses[pos])) | |
6261 | { | |
6262 | this_free++; | |
6263 | cblk->conses[pos].u.chain = cons_free_list; | |
6264 | cons_free_list = &cblk->conses[pos]; | |
34400008 | 6265 | #if GC_MARK_STACK |
3ae2e3a3 | 6266 | cons_free_list->car = Vdead; |
34400008 | 6267 | #endif |
3ae2e3a3 RS |
6268 | } |
6269 | else | |
6270 | { | |
6271 | num_used++; | |
6272 | CONS_UNMARK (&cblk->conses[pos]); | |
6273 | } | |
6274 | } | |
6275 | } | |
6276 | } | |
6277 | ||
7146af97 | 6278 | lim = CONS_BLOCK_SIZE; |
6ca94ac9 KH |
6279 | /* If this block contains only free conses and we have already |
6280 | seen more than two blocks worth of free conses then deallocate | |
6281 | this block. */ | |
6feef451 | 6282 | if (this_free == CONS_BLOCK_SIZE && num_free > CONS_BLOCK_SIZE) |
6ca94ac9 | 6283 | { |
6ca94ac9 KH |
6284 | *cprev = cblk->next; |
6285 | /* Unhook from the free list. */ | |
28a099a4 | 6286 | cons_free_list = cblk->conses[0].u.chain; |
08b7c2cb | 6287 | lisp_align_free (cblk); |
6ca94ac9 KH |
6288 | } |
6289 | else | |
6feef451 AS |
6290 | { |
6291 | num_free += this_free; | |
6292 | cprev = &cblk->next; | |
6293 | } | |
7146af97 JB |
6294 | } |
6295 | total_conses = num_used; | |
6296 | total_free_conses = num_free; | |
6297 | } | |
6298 | ||
7146af97 JB |
6299 | /* Put all unmarked floats on free list */ |
6300 | { | |
6301 | register struct float_block *fblk; | |
6ca94ac9 | 6302 | struct float_block **fprev = &float_block; |
7146af97 | 6303 | register int lim = float_block_index; |
c0c5c8ae | 6304 | EMACS_INT num_free = 0, num_used = 0; |
7146af97 JB |
6305 | |
6306 | float_free_list = 0; | |
177c0ea7 | 6307 | |
6ca94ac9 | 6308 | for (fblk = float_block; fblk; fblk = *fprev) |
7146af97 JB |
6309 | { |
6310 | register int i; | |
6ca94ac9 | 6311 | int this_free = 0; |
7146af97 | 6312 | for (i = 0; i < lim; i++) |
ab6780cd | 6313 | if (!FLOAT_MARKED_P (&fblk->floats[i])) |
7146af97 | 6314 | { |
6ca94ac9 | 6315 | this_free++; |
28a099a4 | 6316 | fblk->floats[i].u.chain = float_free_list; |
7146af97 JB |
6317 | float_free_list = &fblk->floats[i]; |
6318 | } | |
6319 | else | |
6320 | { | |
6321 | num_used++; | |
ab6780cd | 6322 | FLOAT_UNMARK (&fblk->floats[i]); |
7146af97 JB |
6323 | } |
6324 | lim = FLOAT_BLOCK_SIZE; | |
6ca94ac9 KH |
6325 | /* If this block contains only free floats and we have already |
6326 | seen more than two blocks worth of free floats then deallocate | |
6327 | this block. */ | |
6feef451 | 6328 | if (this_free == FLOAT_BLOCK_SIZE && num_free > FLOAT_BLOCK_SIZE) |
6ca94ac9 | 6329 | { |
6ca94ac9 KH |
6330 | *fprev = fblk->next; |
6331 | /* Unhook from the free list. */ | |
28a099a4 | 6332 | float_free_list = fblk->floats[0].u.chain; |
ab6780cd | 6333 | lisp_align_free (fblk); |
6ca94ac9 KH |
6334 | } |
6335 | else | |
6feef451 AS |
6336 | { |
6337 | num_free += this_free; | |
6338 | fprev = &fblk->next; | |
6339 | } | |
7146af97 JB |
6340 | } |
6341 | total_floats = num_used; | |
6342 | total_free_floats = num_free; | |
6343 | } | |
7146af97 | 6344 | |
d5e35230 JA |
6345 | /* Put all unmarked intervals on free list */ |
6346 | { | |
6347 | register struct interval_block *iblk; | |
6ca94ac9 | 6348 | struct interval_block **iprev = &interval_block; |
d5e35230 | 6349 | register int lim = interval_block_index; |
c0c5c8ae | 6350 | EMACS_INT num_free = 0, num_used = 0; |
d5e35230 JA |
6351 | |
6352 | interval_free_list = 0; | |
6353 | ||
6ca94ac9 | 6354 | for (iblk = interval_block; iblk; iblk = *iprev) |
d5e35230 JA |
6355 | { |
6356 | register int i; | |
6ca94ac9 | 6357 | int this_free = 0; |
d5e35230 JA |
6358 | |
6359 | for (i = 0; i < lim; i++) | |
6360 | { | |
2336fe58 | 6361 | if (!iblk->intervals[i].gcmarkbit) |
d5e35230 | 6362 | { |
439d5cb4 | 6363 | SET_INTERVAL_PARENT (&iblk->intervals[i], interval_free_list); |
d5e35230 | 6364 | interval_free_list = &iblk->intervals[i]; |
6ca94ac9 | 6365 | this_free++; |
d5e35230 JA |
6366 | } |
6367 | else | |
6368 | { | |
6369 | num_used++; | |
2336fe58 | 6370 | iblk->intervals[i].gcmarkbit = 0; |
d5e35230 JA |
6371 | } |
6372 | } | |
6373 | lim = INTERVAL_BLOCK_SIZE; | |
6ca94ac9 KH |
6374 | /* If this block contains only free intervals and we have already |
6375 | seen more than two blocks worth of free intervals then | |
6376 | deallocate this block. */ | |
6feef451 | 6377 | if (this_free == INTERVAL_BLOCK_SIZE && num_free > INTERVAL_BLOCK_SIZE) |
6ca94ac9 | 6378 | { |
6ca94ac9 KH |
6379 | *iprev = iblk->next; |
6380 | /* Unhook from the free list. */ | |
439d5cb4 | 6381 | interval_free_list = INTERVAL_PARENT (&iblk->intervals[0]); |
c8099634 | 6382 | lisp_free (iblk); |
6ca94ac9 KH |
6383 | } |
6384 | else | |
6feef451 AS |
6385 | { |
6386 | num_free += this_free; | |
6387 | iprev = &iblk->next; | |
6388 | } | |
d5e35230 JA |
6389 | } |
6390 | total_intervals = num_used; | |
6391 | total_free_intervals = num_free; | |
6392 | } | |
d5e35230 | 6393 | |
7146af97 JB |
6394 | /* Put all unmarked symbols on free list */ |
6395 | { | |
6396 | register struct symbol_block *sblk; | |
6ca94ac9 | 6397 | struct symbol_block **sprev = &symbol_block; |
7146af97 | 6398 | register int lim = symbol_block_index; |
c0c5c8ae | 6399 | EMACS_INT num_free = 0, num_used = 0; |
7146af97 | 6400 | |
d285b373 | 6401 | symbol_free_list = NULL; |
177c0ea7 | 6402 | |
6ca94ac9 | 6403 | for (sblk = symbol_block; sblk; sblk = *sprev) |
7146af97 | 6404 | { |
6ca94ac9 | 6405 | int this_free = 0; |
d55c12ed AS |
6406 | union aligned_Lisp_Symbol *sym = sblk->symbols; |
6407 | union aligned_Lisp_Symbol *end = sym + lim; | |
d285b373 GM |
6408 | |
6409 | for (; sym < end; ++sym) | |
6410 | { | |
20035321 SM |
6411 | /* Check if the symbol was created during loadup. In such a case |
6412 | it might be pointed to by pure bytecode which we don't trace, | |
6413 | so we conservatively assume that it is live. */ | |
d55c12ed | 6414 | int pure_p = PURE_POINTER_P (XSTRING (sym->s.xname)); |
177c0ea7 | 6415 | |
d55c12ed | 6416 | if (!sym->s.gcmarkbit && !pure_p) |
d285b373 | 6417 | { |
d55c12ed AS |
6418 | if (sym->s.redirect == SYMBOL_LOCALIZED) |
6419 | xfree (SYMBOL_BLV (&sym->s)); | |
6420 | sym->s.next = symbol_free_list; | |
6421 | symbol_free_list = &sym->s; | |
34400008 | 6422 | #if GC_MARK_STACK |
d285b373 | 6423 | symbol_free_list->function = Vdead; |
34400008 | 6424 | #endif |
d285b373 GM |
6425 | ++this_free; |
6426 | } | |
6427 | else | |
6428 | { | |
6429 | ++num_used; | |
6430 | if (!pure_p) | |
d55c12ed AS |
6431 | UNMARK_STRING (XSTRING (sym->s.xname)); |
6432 | sym->s.gcmarkbit = 0; | |
d285b373 GM |
6433 | } |
6434 | } | |
177c0ea7 | 6435 | |
7146af97 | 6436 | lim = SYMBOL_BLOCK_SIZE; |
6ca94ac9 KH |
6437 | /* If this block contains only free symbols and we have already |
6438 | seen more than two blocks worth of free symbols then deallocate | |
6439 | this block. */ | |
6feef451 | 6440 | if (this_free == SYMBOL_BLOCK_SIZE && num_free > SYMBOL_BLOCK_SIZE) |
6ca94ac9 | 6441 | { |
6ca94ac9 KH |
6442 | *sprev = sblk->next; |
6443 | /* Unhook from the free list. */ | |
d55c12ed | 6444 | symbol_free_list = sblk->symbols[0].s.next; |
c8099634 | 6445 | lisp_free (sblk); |
6ca94ac9 KH |
6446 | } |
6447 | else | |
6feef451 AS |
6448 | { |
6449 | num_free += this_free; | |
6450 | sprev = &sblk->next; | |
6451 | } | |
7146af97 JB |
6452 | } |
6453 | total_symbols = num_used; | |
6454 | total_free_symbols = num_free; | |
6455 | } | |
6456 | ||
a9faeabe RS |
6457 | /* Put all unmarked misc's on free list. |
6458 | For a marker, first unchain it from the buffer it points into. */ | |
7146af97 JB |
6459 | { |
6460 | register struct marker_block *mblk; | |
6ca94ac9 | 6461 | struct marker_block **mprev = &marker_block; |
7146af97 | 6462 | register int lim = marker_block_index; |
c0c5c8ae | 6463 | EMACS_INT num_free = 0, num_used = 0; |
7146af97 JB |
6464 | |
6465 | marker_free_list = 0; | |
177c0ea7 | 6466 | |
6ca94ac9 | 6467 | for (mblk = marker_block; mblk; mblk = *mprev) |
7146af97 JB |
6468 | { |
6469 | register int i; | |
6ca94ac9 | 6470 | int this_free = 0; |
fa05e253 | 6471 | |
7146af97 | 6472 | for (i = 0; i < lim; i++) |
465edf35 | 6473 | { |
d55c12ed | 6474 | if (!mblk->markers[i].m.u_any.gcmarkbit) |
465edf35 | 6475 | { |
d55c12ed AS |
6476 | if (mblk->markers[i].m.u_any.type == Lisp_Misc_Marker) |
6477 | unchain_marker (&mblk->markers[i].m.u_marker); | |
fa05e253 RS |
6478 | /* Set the type of the freed object to Lisp_Misc_Free. |
6479 | We could leave the type alone, since nobody checks it, | |
465edf35 | 6480 | but this might catch bugs faster. */ |
d55c12ed AS |
6481 | mblk->markers[i].m.u_marker.type = Lisp_Misc_Free; |
6482 | mblk->markers[i].m.u_free.chain = marker_free_list; | |
6483 | marker_free_list = &mblk->markers[i].m; | |
6ca94ac9 | 6484 | this_free++; |
465edf35 KH |
6485 | } |
6486 | else | |
6487 | { | |
6488 | num_used++; | |
d55c12ed | 6489 | mblk->markers[i].m.u_any.gcmarkbit = 0; |
465edf35 KH |
6490 | } |
6491 | } | |
7146af97 | 6492 | lim = MARKER_BLOCK_SIZE; |
6ca94ac9 KH |
6493 | /* If this block contains only free markers and we have already |
6494 | seen more than two blocks worth of free markers then deallocate | |
6495 | this block. */ | |
6feef451 | 6496 | if (this_free == MARKER_BLOCK_SIZE && num_free > MARKER_BLOCK_SIZE) |
6ca94ac9 | 6497 | { |
6ca94ac9 KH |
6498 | *mprev = mblk->next; |
6499 | /* Unhook from the free list. */ | |
d55c12ed | 6500 | marker_free_list = mblk->markers[0].m.u_free.chain; |
c8099634 | 6501 | lisp_free (mblk); |
6ca94ac9 KH |
6502 | } |
6503 | else | |
6feef451 AS |
6504 | { |
6505 | num_free += this_free; | |
6506 | mprev = &mblk->next; | |
6507 | } | |
7146af97 JB |
6508 | } |
6509 | ||
6510 | total_markers = num_used; | |
6511 | total_free_markers = num_free; | |
6512 | } | |
6513 | ||
6514 | /* Free all unmarked buffers */ | |
6515 | { | |
6516 | register struct buffer *buffer = all_buffers, *prev = 0, *next; | |
6517 | ||
6518 | while (buffer) | |
3ef06d12 | 6519 | if (!VECTOR_MARKED_P (buffer)) |
7146af97 JB |
6520 | { |
6521 | if (prev) | |
eab3844f | 6522 | prev->header.next = buffer->header.next; |
7146af97 | 6523 | else |
eab3844f PE |
6524 | all_buffers = buffer->header.next.buffer; |
6525 | next = buffer->header.next.buffer; | |
34400008 | 6526 | lisp_free (buffer); |
7146af97 JB |
6527 | buffer = next; |
6528 | } | |
6529 | else | |
6530 | { | |
3ef06d12 | 6531 | VECTOR_UNMARK (buffer); |
30e3190a | 6532 | UNMARK_BALANCE_INTERVALS (BUF_INTERVALS (buffer)); |
eab3844f | 6533 | prev = buffer, buffer = buffer->header.next.buffer; |
7146af97 JB |
6534 | } |
6535 | } | |
6536 | ||
f3372c87 | 6537 | sweep_vectors (); |
177c0ea7 | 6538 | |
676a7251 GM |
6539 | #ifdef GC_CHECK_STRING_BYTES |
6540 | if (!noninteractive) | |
6541 | check_string_bytes (1); | |
6542 | #endif | |
7146af97 | 6543 | } |
7146af97 | 6544 | |
7146af97 | 6545 | |
7146af97 | 6546 | |
7146af97 | 6547 | \f |
20d24714 JB |
6548 | /* Debugging aids. */ |
6549 | ||
31ce1c91 | 6550 | DEFUN ("memory-limit", Fmemory_limit, Smemory_limit, 0, 0, 0, |
a6266d23 | 6551 | doc: /* Return the address of the last byte Emacs has allocated, divided by 1024. |
228299fa | 6552 | This may be helpful in debugging Emacs's memory usage. |
7ee72033 | 6553 | We divide the value by 1024 to make sure it fits in a Lisp integer. */) |
5842a27b | 6554 | (void) |
20d24714 JB |
6555 | { |
6556 | Lisp_Object end; | |
6557 | ||
d01a7826 | 6558 | XSETINT (end, (intptr_t) (char *) sbrk (0) / 1024); |
20d24714 JB |
6559 | |
6560 | return end; | |
6561 | } | |
6562 | ||
310ea200 | 6563 | DEFUN ("memory-use-counts", Fmemory_use_counts, Smemory_use_counts, 0, 0, 0, |
a6266d23 | 6564 | doc: /* Return a list of counters that measure how much consing there has been. |
228299fa GM |
6565 | Each of these counters increments for a certain kind of object. |
6566 | The counters wrap around from the largest positive integer to zero. | |
6567 | Garbage collection does not decrease them. | |
6568 | The elements of the value are as follows: | |
6569 | (CONSES FLOATS VECTOR-CELLS SYMBOLS STRING-CHARS MISCS INTERVALS STRINGS) | |
6570 | All are in units of 1 = one object consed | |
6571 | except for VECTOR-CELLS and STRING-CHARS, which count the total length of | |
6572 | objects consed. | |
6573 | MISCS include overlays, markers, and some internal types. | |
6574 | Frames, windows, buffers, and subprocesses count as vectors | |
7ee72033 | 6575 | (but the contents of a buffer's text do not count here). */) |
5842a27b | 6576 | (void) |
310ea200 | 6577 | { |
2e471eb5 | 6578 | Lisp_Object consed[8]; |
310ea200 | 6579 | |
78e985eb GM |
6580 | consed[0] = make_number (min (MOST_POSITIVE_FIXNUM, cons_cells_consed)); |
6581 | consed[1] = make_number (min (MOST_POSITIVE_FIXNUM, floats_consed)); | |
6582 | consed[2] = make_number (min (MOST_POSITIVE_FIXNUM, vector_cells_consed)); | |
6583 | consed[3] = make_number (min (MOST_POSITIVE_FIXNUM, symbols_consed)); | |
6584 | consed[4] = make_number (min (MOST_POSITIVE_FIXNUM, string_chars_consed)); | |
6585 | consed[5] = make_number (min (MOST_POSITIVE_FIXNUM, misc_objects_consed)); | |
6586 | consed[6] = make_number (min (MOST_POSITIVE_FIXNUM, intervals_consed)); | |
6587 | consed[7] = make_number (min (MOST_POSITIVE_FIXNUM, strings_consed)); | |
310ea200 | 6588 | |
2e471eb5 | 6589 | return Flist (8, consed); |
310ea200 | 6590 | } |
e0b8c689 | 6591 | |
8b058d44 EZ |
6592 | /* Find at most FIND_MAX symbols which have OBJ as their value or |
6593 | function. This is used in gdbinit's `xwhichsymbols' command. */ | |
6594 | ||
6595 | Lisp_Object | |
196e41e4 | 6596 | which_symbols (Lisp_Object obj, EMACS_INT find_max) |
8b058d44 EZ |
6597 | { |
6598 | struct symbol_block *sblk; | |
8d0eb4c2 | 6599 | ptrdiff_t gc_count = inhibit_garbage_collection (); |
8b058d44 EZ |
6600 | Lisp_Object found = Qnil; |
6601 | ||
ca78dc43 | 6602 | if (! DEADP (obj)) |
8b058d44 EZ |
6603 | { |
6604 | for (sblk = symbol_block; sblk; sblk = sblk->next) | |
6605 | { | |
9426aba4 | 6606 | union aligned_Lisp_Symbol *aligned_sym = sblk->symbols; |
8b058d44 EZ |
6607 | int bn; |
6608 | ||
9426aba4 | 6609 | for (bn = 0; bn < SYMBOL_BLOCK_SIZE; bn++, aligned_sym++) |
8b058d44 | 6610 | { |
9426aba4 | 6611 | struct Lisp_Symbol *sym = &aligned_sym->s; |
8b058d44 EZ |
6612 | Lisp_Object val; |
6613 | Lisp_Object tem; | |
6614 | ||
6615 | if (sblk == symbol_block && bn >= symbol_block_index) | |
6616 | break; | |
6617 | ||
6618 | XSETSYMBOL (tem, sym); | |
6619 | val = find_symbol_value (tem); | |
6620 | if (EQ (val, obj) | |
6621 | || EQ (sym->function, obj) | |
6622 | || (!NILP (sym->function) | |
6623 | && COMPILEDP (sym->function) | |
6624 | && EQ (AREF (sym->function, COMPILED_BYTECODE), obj)) | |
6625 | || (!NILP (val) | |
6626 | && COMPILEDP (val) | |
6627 | && EQ (AREF (val, COMPILED_BYTECODE), obj))) | |
6628 | { | |
6629 | found = Fcons (tem, found); | |
6630 | if (--find_max == 0) | |
6631 | goto out; | |
6632 | } | |
6633 | } | |
6634 | } | |
6635 | } | |
6636 | ||
6637 | out: | |
6638 | unbind_to (gc_count, Qnil); | |
6639 | return found; | |
6640 | } | |
6641 | ||
244ed907 | 6642 | #ifdef ENABLE_CHECKING |
e0b8c689 | 6643 | int suppress_checking; |
d3d47262 | 6644 | |
e0b8c689 | 6645 | void |
971de7fb | 6646 | die (const char *msg, const char *file, int line) |
e0b8c689 | 6647 | { |
67ee9f6e | 6648 | fprintf (stderr, "\r\n%s:%d: Emacs fatal error: %s\r\n", |
e0b8c689 KR |
6649 | file, line, msg); |
6650 | abort (); | |
6651 | } | |
244ed907 | 6652 | #endif |
20d24714 | 6653 | \f |
7146af97 JB |
6654 | /* Initialization */ |
6655 | ||
dfcf069d | 6656 | void |
971de7fb | 6657 | init_alloc_once (void) |
7146af97 JB |
6658 | { |
6659 | /* Used to do Vpurify_flag = Qt here, but Qt isn't set up yet! */ | |
9e713715 GM |
6660 | purebeg = PUREBEG; |
6661 | pure_size = PURESIZE; | |
1f0b3fd2 | 6662 | pure_bytes_used = 0; |
e5bc14d4 | 6663 | pure_bytes_used_lisp = pure_bytes_used_non_lisp = 0; |
9e713715 GM |
6664 | pure_bytes_used_before_overflow = 0; |
6665 | ||
ab6780cd SM |
6666 | /* Initialize the list of free aligned blocks. */ |
6667 | free_ablock = NULL; | |
6668 | ||
877935b1 | 6669 | #if GC_MARK_STACK || defined GC_MALLOC_CHECK |
34400008 GM |
6670 | mem_init (); |
6671 | Vdead = make_pure_string ("DEAD", 4, 4, 0); | |
6672 | #endif | |
9e713715 | 6673 | |
7146af97 | 6674 | ignore_warnings = 1; |
d1658221 RS |
6675 | #ifdef DOUG_LEA_MALLOC |
6676 | mallopt (M_TRIM_THRESHOLD, 128*1024); /* trim threshold */ | |
6677 | mallopt (M_MMAP_THRESHOLD, 64*1024); /* mmap threshold */ | |
81d492d5 | 6678 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); /* max. number of mmap'ed areas */ |
d1658221 | 6679 | #endif |
7146af97 JB |
6680 | init_strings (); |
6681 | init_cons (); | |
6682 | init_symbol (); | |
6683 | init_marker (); | |
7146af97 | 6684 | init_float (); |
34400008 | 6685 | init_intervals (); |
f3372c87 | 6686 | init_vectors (); |
5ac58e4c | 6687 | init_weak_hash_tables (); |
d5e35230 | 6688 | |
276cbe5a RS |
6689 | #ifdef REL_ALLOC |
6690 | malloc_hysteresis = 32; | |
6691 | #else | |
6692 | malloc_hysteresis = 0; | |
6693 | #endif | |
6694 | ||
24d8a105 | 6695 | refill_memory_reserve (); |
276cbe5a | 6696 | |
7146af97 JB |
6697 | ignore_warnings = 0; |
6698 | gcprolist = 0; | |
630686c8 | 6699 | byte_stack_list = 0; |
7146af97 JB |
6700 | staticidx = 0; |
6701 | consing_since_gc = 0; | |
7d179cea | 6702 | gc_cons_threshold = 100000 * sizeof (Lisp_Object); |
974aae61 | 6703 | gc_relative_threshold = 0; |
7146af97 JB |
6704 | } |
6705 | ||
dfcf069d | 6706 | void |
971de7fb | 6707 | init_alloc (void) |
7146af97 JB |
6708 | { |
6709 | gcprolist = 0; | |
630686c8 | 6710 | byte_stack_list = 0; |
182ff242 GM |
6711 | #if GC_MARK_STACK |
6712 | #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS | |
6713 | setjmp_tested_p = longjmps_done = 0; | |
6714 | #endif | |
6715 | #endif | |
2c5bd608 DL |
6716 | Vgc_elapsed = make_float (0.0); |
6717 | gcs_done = 0; | |
7146af97 JB |
6718 | } |
6719 | ||
6720 | void | |
971de7fb | 6721 | syms_of_alloc (void) |
7146af97 | 6722 | { |
29208e82 | 6723 | DEFVAR_INT ("gc-cons-threshold", gc_cons_threshold, |
fb7ada5f | 6724 | doc: /* Number of bytes of consing between garbage collections. |
228299fa GM |
6725 | Garbage collection can happen automatically once this many bytes have been |
6726 | allocated since the last garbage collection. All data types count. | |
7146af97 | 6727 | |
228299fa | 6728 | Garbage collection happens automatically only when `eval' is called. |
7146af97 | 6729 | |
228299fa | 6730 | By binding this temporarily to a large number, you can effectively |
96f077ad SM |
6731 | prevent garbage collection during a part of the program. |
6732 | See also `gc-cons-percentage'. */); | |
6733 | ||
29208e82 | 6734 | DEFVAR_LISP ("gc-cons-percentage", Vgc_cons_percentage, |
fb7ada5f | 6735 | doc: /* Portion of the heap used for allocation. |
96f077ad SM |
6736 | Garbage collection can happen automatically once this portion of the heap |
6737 | has been allocated since the last garbage collection. | |
6738 | If this portion is smaller than `gc-cons-threshold', this is ignored. */); | |
6739 | Vgc_cons_percentage = make_float (0.1); | |
0819585c | 6740 | |
29208e82 | 6741 | DEFVAR_INT ("pure-bytes-used", pure_bytes_used, |
333f9019 | 6742 | doc: /* Number of bytes of shareable Lisp data allocated so far. */); |
0819585c | 6743 | |
29208e82 | 6744 | DEFVAR_INT ("cons-cells-consed", cons_cells_consed, |
a6266d23 | 6745 | doc: /* Number of cons cells that have been consed so far. */); |
0819585c | 6746 | |
29208e82 | 6747 | DEFVAR_INT ("floats-consed", floats_consed, |
a6266d23 | 6748 | doc: /* Number of floats that have been consed so far. */); |
0819585c | 6749 | |
29208e82 | 6750 | DEFVAR_INT ("vector-cells-consed", vector_cells_consed, |
a6266d23 | 6751 | doc: /* Number of vector cells that have been consed so far. */); |
0819585c | 6752 | |
29208e82 | 6753 | DEFVAR_INT ("symbols-consed", symbols_consed, |
a6266d23 | 6754 | doc: /* Number of symbols that have been consed so far. */); |
0819585c | 6755 | |
29208e82 | 6756 | DEFVAR_INT ("string-chars-consed", string_chars_consed, |
a6266d23 | 6757 | doc: /* Number of string characters that have been consed so far. */); |
0819585c | 6758 | |
29208e82 | 6759 | DEFVAR_INT ("misc-objects-consed", misc_objects_consed, |
01a6dcc8 GM |
6760 | doc: /* Number of miscellaneous objects that have been consed so far. |
6761 | These include markers and overlays, plus certain objects not visible | |
6762 | to users. */); | |
2e471eb5 | 6763 | |
29208e82 | 6764 | DEFVAR_INT ("intervals-consed", intervals_consed, |
a6266d23 | 6765 | doc: /* Number of intervals that have been consed so far. */); |
7146af97 | 6766 | |
29208e82 | 6767 | DEFVAR_INT ("strings-consed", strings_consed, |
a6266d23 | 6768 | doc: /* Number of strings that have been consed so far. */); |
228299fa | 6769 | |
29208e82 | 6770 | DEFVAR_LISP ("purify-flag", Vpurify_flag, |
a6266d23 | 6771 | doc: /* Non-nil means loading Lisp code in order to dump an executable. |
e9515805 SM |
6772 | This means that certain objects should be allocated in shared (pure) space. |
6773 | It can also be set to a hash-table, in which case this table is used to | |
6774 | do hash-consing of the objects allocated to pure space. */); | |
228299fa | 6775 | |
29208e82 | 6776 | DEFVAR_BOOL ("garbage-collection-messages", garbage_collection_messages, |
a6266d23 | 6777 | doc: /* Non-nil means display messages at start and end of garbage collection. */); |
299585ee RS |
6778 | garbage_collection_messages = 0; |
6779 | ||
29208e82 | 6780 | DEFVAR_LISP ("post-gc-hook", Vpost_gc_hook, |
a6266d23 | 6781 | doc: /* Hook run after garbage collection has finished. */); |
9e713715 | 6782 | Vpost_gc_hook = Qnil; |
cd3520a4 | 6783 | DEFSYM (Qpost_gc_hook, "post-gc-hook"); |
9e713715 | 6784 | |
29208e82 | 6785 | DEFVAR_LISP ("memory-signal-data", Vmemory_signal_data, |
74a54b04 | 6786 | doc: /* Precomputed `signal' argument for memory-full error. */); |
bcb61d60 KH |
6787 | /* We build this in advance because if we wait until we need it, we might |
6788 | not be able to allocate the memory to hold it. */ | |
74a54b04 | 6789 | Vmemory_signal_data |
f4265f6c DN |
6790 | = pure_cons (Qerror, |
6791 | pure_cons (make_pure_c_string ("Memory exhausted--use M-x save-some-buffers then exit and restart Emacs"), Qnil)); | |
74a54b04 | 6792 | |
29208e82 | 6793 | DEFVAR_LISP ("memory-full", Vmemory_full, |
24d8a105 | 6794 | doc: /* Non-nil means Emacs cannot get much more Lisp memory. */); |
74a54b04 | 6795 | Vmemory_full = Qnil; |
bcb61d60 | 6796 | |
cd3520a4 JB |
6797 | DEFSYM (Qgc_cons_threshold, "gc-cons-threshold"); |
6798 | DEFSYM (Qchar_table_extra_slots, "char-table-extra-slots"); | |
a59de17b | 6799 | |
29208e82 | 6800 | DEFVAR_LISP ("gc-elapsed", Vgc_elapsed, |
2c5bd608 | 6801 | doc: /* Accumulated time elapsed in garbage collections. |
e7415487 | 6802 | The time is in seconds as a floating point value. */); |
29208e82 | 6803 | DEFVAR_INT ("gcs-done", gcs_done, |
e7415487 | 6804 | doc: /* Accumulated number of garbage collections done. */); |
2c5bd608 | 6805 | |
7146af97 JB |
6806 | defsubr (&Scons); |
6807 | defsubr (&Slist); | |
6808 | defsubr (&Svector); | |
6809 | defsubr (&Smake_byte_code); | |
6810 | defsubr (&Smake_list); | |
6811 | defsubr (&Smake_vector); | |
6812 | defsubr (&Smake_string); | |
7b07587b | 6813 | defsubr (&Smake_bool_vector); |
7146af97 JB |
6814 | defsubr (&Smake_symbol); |
6815 | defsubr (&Smake_marker); | |
6816 | defsubr (&Spurecopy); | |
6817 | defsubr (&Sgarbage_collect); | |
20d24714 | 6818 | defsubr (&Smemory_limit); |
310ea200 | 6819 | defsubr (&Smemory_use_counts); |
34400008 GM |
6820 | |
6821 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES | |
6822 | defsubr (&Sgc_status); | |
6823 | #endif | |
7146af97 | 6824 | } |