Commit | Line | Data |
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7146af97 | 1 | /* Storage allocation and gc for GNU Emacs Lisp interpreter. |
999dd333 | 2 | |
ba318903 | 3 | Copyright (C) 1985-1986, 1988, 1993-1995, 1997-2014 Free Software |
ab422c4d | 4 | 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> |
f162bcc3 | 22 | |
e9b309ac | 23 | #include <stdio.h> |
ab6780cd | 24 | #include <limits.h> /* For CHAR_BIT. */ |
92939d31 | 25 | |
bc8000ff | 26 | #ifdef ENABLE_CHECKING |
b09cca6a | 27 | #include <signal.h> /* For SIGABRT. */ |
bc8000ff EZ |
28 | #endif |
29 | ||
ae9e757a | 30 | #ifdef HAVE_PTHREAD |
aa477689 JD |
31 | #include <pthread.h> |
32 | #endif | |
33 | ||
7146af97 | 34 | #include "lisp.h" |
ece93c02 | 35 | #include "process.h" |
d5e35230 | 36 | #include "intervals.h" |
4c0be5f4 | 37 | #include "puresize.h" |
e5560ff7 | 38 | #include "character.h" |
7146af97 JB |
39 | #include "buffer.h" |
40 | #include "window.h" | |
2538fae4 | 41 | #include "keyboard.h" |
502b9b64 | 42 | #include "frame.h" |
9ac0d9e0 | 43 | #include "blockinput.h" |
4a729fd8 | 44 | #include "termhooks.h" /* For struct terminal. */ |
d141d701 DA |
45 | #ifdef HAVE_WINDOW_SYSTEM |
46 | #include TERM_HEADER | |
47 | #endif /* HAVE_WINDOW_SYSTEM */ | |
0328b6de | 48 | |
0065d054 | 49 | #include <verify.h> |
608a4502 | 50 | #include <execinfo.h> /* For backtrace. */ |
01ae0fbf | 51 | |
009581fa PE |
52 | #if (defined ENABLE_CHECKING \ |
53 | && defined HAVE_VALGRIND_VALGRIND_H \ | |
54 | && !defined USE_VALGRIND) | |
55 | # define USE_VALGRIND 1 | |
56 | #endif | |
57 | ||
a84683fd DC |
58 | #if USE_VALGRIND |
59 | #include <valgrind/valgrind.h> | |
60 | #include <valgrind/memcheck.h> | |
d160dd0c | 61 | static bool valgrind_p; |
a84683fd DC |
62 | #endif |
63 | ||
52828e02 PE |
64 | /* GC_CHECK_MARKED_OBJECTS means do sanity checks on allocated objects. |
65 | Doable only if GC_MARK_STACK. */ | |
66 | #if ! GC_MARK_STACK | |
67 | # undef GC_CHECK_MARKED_OBJECTS | |
68 | #endif | |
69 | ||
6b61353c | 70 | /* GC_MALLOC_CHECK defined means perform validity checks of malloc'd |
52828e02 PE |
71 | memory. Can do this only if using gmalloc.c and if not checking |
72 | marked objects. */ | |
6b61353c | 73 | |
52828e02 PE |
74 | #if (defined SYSTEM_MALLOC || defined DOUG_LEA_MALLOC \ |
75 | || defined GC_CHECK_MARKED_OBJECTS) | |
6b61353c KH |
76 | #undef GC_MALLOC_CHECK |
77 | #endif | |
78 | ||
bf952fb6 | 79 | #include <unistd.h> |
de7124a7 | 80 | #include <fcntl.h> |
de7124a7 | 81 | |
a411ac43 PE |
82 | #ifdef USE_GTK |
83 | # include "gtkutil.h" | |
84 | #endif | |
69666f77 | 85 | #ifdef WINDOWSNT |
f892cf9c | 86 | #include "w32.h" |
62aba0d4 | 87 | #include "w32heap.h" /* for sbrk */ |
69666f77 EZ |
88 | #endif |
89 | ||
d1658221 | 90 | #ifdef DOUG_LEA_MALLOC |
2e471eb5 | 91 | |
d1658221 | 92 | #include <malloc.h> |
81d492d5 | 93 | |
2e471eb5 GM |
94 | /* Specify maximum number of areas to mmap. It would be nice to use a |
95 | value that explicitly means "no limit". */ | |
96 | ||
81d492d5 RS |
97 | #define MMAP_MAX_AREAS 100000000 |
98 | ||
2e471eb5 | 99 | #endif /* not DOUG_LEA_MALLOC */ |
276cbe5a | 100 | |
2e471eb5 GM |
101 | /* Mark, unmark, query mark bit of a Lisp string. S must be a pointer |
102 | to a struct Lisp_String. */ | |
103 | ||
7cdee936 SM |
104 | #define MARK_STRING(S) ((S)->size |= ARRAY_MARK_FLAG) |
105 | #define UNMARK_STRING(S) ((S)->size &= ~ARRAY_MARK_FLAG) | |
b059de99 | 106 | #define STRING_MARKED_P(S) (((S)->size & ARRAY_MARK_FLAG) != 0) |
2e471eb5 | 107 | |
eab3844f PE |
108 | #define VECTOR_MARK(V) ((V)->header.size |= ARRAY_MARK_FLAG) |
109 | #define VECTOR_UNMARK(V) ((V)->header.size &= ~ARRAY_MARK_FLAG) | |
110 | #define VECTOR_MARKED_P(V) (((V)->header.size & ARRAY_MARK_FLAG) != 0) | |
3ef06d12 | 111 | |
0dd6d66d DA |
112 | /* Default value of gc_cons_threshold (see below). */ |
113 | ||
663e2b3f | 114 | #define GC_DEFAULT_THRESHOLD (100000 * word_size) |
0dd6d66d | 115 | |
29208e82 TT |
116 | /* Global variables. */ |
117 | struct emacs_globals globals; | |
118 | ||
2e471eb5 GM |
119 | /* Number of bytes of consing done since the last gc. */ |
120 | ||
dac616ff | 121 | EMACS_INT consing_since_gc; |
7146af97 | 122 | |
974aae61 RS |
123 | /* Similar minimum, computed from Vgc_cons_percentage. */ |
124 | ||
dac616ff | 125 | EMACS_INT gc_relative_threshold; |
310ea200 | 126 | |
24d8a105 RS |
127 | /* Minimum number of bytes of consing since GC before next GC, |
128 | when memory is full. */ | |
129 | ||
dac616ff | 130 | EMACS_INT memory_full_cons_threshold; |
24d8a105 | 131 | |
fce31d69 | 132 | /* True during GC. */ |
2e471eb5 | 133 | |
fce31d69 | 134 | bool gc_in_progress; |
7146af97 | 135 | |
fce31d69 | 136 | /* True means abort if try to GC. |
3de0effb RS |
137 | This is for code which is written on the assumption that |
138 | no GC will happen, so as to verify that assumption. */ | |
139 | ||
fce31d69 | 140 | bool abort_on_gc; |
3de0effb | 141 | |
34400008 GM |
142 | /* Number of live and free conses etc. */ |
143 | ||
3ab6e069 | 144 | static EMACS_INT total_conses, total_markers, total_symbols, total_buffers; |
c0c5c8ae | 145 | static EMACS_INT total_free_conses, total_free_markers, total_free_symbols; |
3ab6e069 | 146 | static EMACS_INT total_free_floats, total_floats; |
fd27a537 | 147 | |
2e471eb5 | 148 | /* Points to memory space allocated as "spare", to be freed if we run |
24d8a105 RS |
149 | out of memory. We keep one large block, four cons-blocks, and |
150 | two string blocks. */ | |
2e471eb5 | 151 | |
d3d47262 | 152 | static char *spare_memory[7]; |
276cbe5a | 153 | |
2b6148e4 PE |
154 | /* Amount of spare memory to keep in large reserve block, or to see |
155 | whether this much is available when malloc fails on a larger request. */ | |
2e471eb5 | 156 | |
276cbe5a | 157 | #define SPARE_MEMORY (1 << 14) |
4d09bcf6 | 158 | |
1b8950e5 RS |
159 | /* Initialize it to a nonzero value to force it into data space |
160 | (rather than bss space). That way unexec will remap it into text | |
161 | space (pure), on some systems. We have not implemented the | |
162 | remapping on more recent systems because this is less important | |
163 | nowadays than in the days of small memories and timesharing. */ | |
2e471eb5 | 164 | |
2c4685ee | 165 | EMACS_INT pure[(PURESIZE + sizeof (EMACS_INT) - 1) / sizeof (EMACS_INT)] = {1,}; |
7146af97 | 166 | #define PUREBEG (char *) pure |
2e471eb5 | 167 | |
9e713715 | 168 | /* Pointer to the pure area, and its size. */ |
2e471eb5 | 169 | |
9e713715 | 170 | static char *purebeg; |
903fe15d | 171 | static ptrdiff_t pure_size; |
9e713715 GM |
172 | |
173 | /* Number of bytes of pure storage used before pure storage overflowed. | |
174 | If this is non-zero, this implies that an overflow occurred. */ | |
175 | ||
903fe15d | 176 | static ptrdiff_t pure_bytes_used_before_overflow; |
7146af97 | 177 | |
fce31d69 | 178 | /* True if P points into pure space. */ |
34400008 GM |
179 | |
180 | #define PURE_POINTER_P(P) \ | |
6a0bf43d | 181 | ((uintptr_t) (P) - (uintptr_t) purebeg <= pure_size) |
34400008 | 182 | |
fecbd8ff | 183 | /* Index in pure at which next pure Lisp object will be allocated.. */ |
e5bc14d4 | 184 | |
d311d28c | 185 | static ptrdiff_t pure_bytes_used_lisp; |
e5bc14d4 YM |
186 | |
187 | /* Number of bytes allocated for non-Lisp objects in pure storage. */ | |
188 | ||
d311d28c | 189 | static ptrdiff_t pure_bytes_used_non_lisp; |
e5bc14d4 | 190 | |
2e471eb5 GM |
191 | /* If nonzero, this is a warning delivered by malloc and not yet |
192 | displayed. */ | |
193 | ||
a8fe7202 | 194 | const char *pending_malloc_warning; |
7146af97 | 195 | |
01ae0fbf DC |
196 | #if 0 /* Normally, pointer sanity only on request... */ |
197 | #ifdef ENABLE_CHECKING | |
198 | #define SUSPICIOUS_OBJECT_CHECKING 1 | |
199 | #endif | |
200 | #endif | |
201 | ||
202 | /* ... but unconditionally use SUSPICIOUS_OBJECT_CHECKING while the GC | |
203 | bug is unresolved. */ | |
204 | #define SUSPICIOUS_OBJECT_CHECKING 1 | |
205 | ||
206 | #ifdef SUSPICIOUS_OBJECT_CHECKING | |
608a4502 PE |
207 | struct suspicious_free_record |
208 | { | |
faa52174 | 209 | void *suspicious_object; |
faa52174 | 210 | void *backtrace[128]; |
01ae0fbf | 211 | }; |
faa52174 | 212 | static void *suspicious_objects[32]; |
01ae0fbf | 213 | static int suspicious_object_index; |
608a4502 | 214 | struct suspicious_free_record suspicious_free_history[64] EXTERNALLY_VISIBLE; |
01ae0fbf DC |
215 | static int suspicious_free_history_index; |
216 | /* Find the first currently-monitored suspicious pointer in range | |
217 | [begin,end) or NULL if no such pointer exists. */ | |
faa52174 PE |
218 | static void *find_suspicious_object_in_range (void *begin, void *end); |
219 | static void detect_suspicious_free (void *ptr); | |
01ae0fbf | 220 | #else |
608a4502 PE |
221 | # define find_suspicious_object_in_range(begin, end) NULL |
222 | # define detect_suspicious_free(ptr) (void) | |
01ae0fbf DC |
223 | #endif |
224 | ||
7146af97 JB |
225 | /* Maximum amount of C stack to save when a GC happens. */ |
226 | ||
227 | #ifndef MAX_SAVE_STACK | |
228 | #define MAX_SAVE_STACK 16000 | |
229 | #endif | |
230 | ||
231 | /* Buffer in which we save a copy of the C stack at each GC. */ | |
232 | ||
dd3f25f7 | 233 | #if MAX_SAVE_STACK > 0 |
d3d47262 | 234 | static char *stack_copy; |
903fe15d | 235 | static ptrdiff_t stack_copy_size; |
e76119d7 PE |
236 | |
237 | /* Copy to DEST a block of memory from SRC of size SIZE bytes, | |
238 | avoiding any address sanitization. */ | |
239 | ||
240 | static void * ATTRIBUTE_NO_SANITIZE_ADDRESS | |
241 | no_sanitize_memcpy (void *dest, void const *src, size_t size) | |
242 | { | |
243 | if (! ADDRESS_SANITIZER) | |
244 | return memcpy (dest, src, size); | |
245 | else | |
246 | { | |
247 | size_t i; | |
248 | char *d = dest; | |
249 | char const *s = src; | |
250 | for (i = 0; i < size; i++) | |
251 | d[i] = s[i]; | |
252 | return dest; | |
253 | } | |
254 | } | |
255 | ||
256 | #endif /* MAX_SAVE_STACK > 0 */ | |
7146af97 | 257 | |
fecbd8ff SM |
258 | static Lisp_Object Qconses; |
259 | static Lisp_Object Qsymbols; | |
260 | static Lisp_Object Qmiscs; | |
261 | static Lisp_Object Qstrings; | |
262 | static Lisp_Object Qvectors; | |
263 | static Lisp_Object Qfloats; | |
264 | static Lisp_Object Qintervals; | |
265 | static Lisp_Object Qbuffers; | |
f8643a6b | 266 | static Lisp_Object Qstring_bytes, Qvector_slots, Qheap; |
955cbe7b | 267 | static Lisp_Object Qgc_cons_threshold; |
3d80c99f | 268 | Lisp_Object Qautomatic_gc; |
955cbe7b | 269 | Lisp_Object Qchar_table_extra_slots; |
e8197642 | 270 | |
9e713715 GM |
271 | /* Hook run after GC has finished. */ |
272 | ||
955cbe7b | 273 | static Lisp_Object Qpost_gc_hook; |
2c5bd608 | 274 | |
f57e2426 | 275 | static void mark_terminals (void); |
f57e2426 | 276 | static void gc_sweep (void); |
72cb32cf | 277 | static Lisp_Object make_pure_vector (ptrdiff_t); |
c752cfa9 | 278 | static void mark_buffer (struct buffer *); |
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 void compact_small_strings (void); |
284 | static void free_large_strings (void); | |
196e41e4 | 285 | extern Lisp_Object which_symbols (Lisp_Object, EMACS_INT) EXTERNALLY_VISIBLE; |
34400008 | 286 | |
914adc42 DA |
287 | /* When scanning the C stack for live Lisp objects, Emacs keeps track of |
288 | what memory allocated via lisp_malloc and lisp_align_malloc is intended | |
289 | for what purpose. This enumeration specifies the type of memory. */ | |
34400008 GM |
290 | |
291 | enum mem_type | |
292 | { | |
293 | MEM_TYPE_NON_LISP, | |
294 | MEM_TYPE_BUFFER, | |
295 | MEM_TYPE_CONS, | |
296 | MEM_TYPE_STRING, | |
297 | MEM_TYPE_MISC, | |
298 | MEM_TYPE_SYMBOL, | |
299 | MEM_TYPE_FLOAT, | |
914adc42 DA |
300 | /* Since all non-bool pseudovectors are small enough to be |
301 | allocated from vector blocks, this memory type denotes | |
302 | large regular vectors and large bool pseudovectors. */ | |
f3372c87 DA |
303 | MEM_TYPE_VECTORLIKE, |
304 | /* Special type to denote vector blocks. */ | |
35aaa1ea DA |
305 | MEM_TYPE_VECTOR_BLOCK, |
306 | /* Special type to denote reserved memory. */ | |
307 | MEM_TYPE_SPARE | |
34400008 GM |
308 | }; |
309 | ||
877935b1 | 310 | #if GC_MARK_STACK || defined GC_MALLOC_CHECK |
0b378936 | 311 | |
0b378936 GM |
312 | /* A unique object in pure space used to make some Lisp objects |
313 | on free lists recognizable in O(1). */ | |
314 | ||
d3d47262 | 315 | static Lisp_Object Vdead; |
ca78dc43 | 316 | #define DEADP(x) EQ (x, Vdead) |
0b378936 | 317 | |
877935b1 GM |
318 | #ifdef GC_MALLOC_CHECK |
319 | ||
320 | enum mem_type allocated_mem_type; | |
877935b1 GM |
321 | |
322 | #endif /* GC_MALLOC_CHECK */ | |
323 | ||
324 | /* A node in the red-black tree describing allocated memory containing | |
325 | Lisp data. Each such block is recorded with its start and end | |
326 | address when it is allocated, and removed from the tree when it | |
327 | is freed. | |
328 | ||
329 | A red-black tree is a balanced binary tree with the following | |
330 | properties: | |
331 | ||
332 | 1. Every node is either red or black. | |
333 | 2. Every leaf is black. | |
334 | 3. If a node is red, then both of its children are black. | |
335 | 4. Every simple path from a node to a descendant leaf contains | |
336 | the same number of black nodes. | |
337 | 5. The root is always black. | |
338 | ||
339 | When nodes are inserted into the tree, or deleted from the tree, | |
340 | the tree is "fixed" so that these properties are always true. | |
341 | ||
342 | A red-black tree with N internal nodes has height at most 2 | |
343 | log(N+1). Searches, insertions and deletions are done in O(log N). | |
344 | Please see a text book about data structures for a detailed | |
345 | description of red-black trees. Any book worth its salt should | |
346 | describe them. */ | |
347 | ||
348 | struct mem_node | |
349 | { | |
9f7d9210 RS |
350 | /* Children of this node. These pointers are never NULL. When there |
351 | is no child, the value is MEM_NIL, which points to a dummy node. */ | |
352 | struct mem_node *left, *right; | |
353 | ||
354 | /* The parent of this node. In the root node, this is NULL. */ | |
355 | struct mem_node *parent; | |
877935b1 GM |
356 | |
357 | /* Start and end of allocated region. */ | |
358 | void *start, *end; | |
359 | ||
360 | /* Node color. */ | |
361 | enum {MEM_BLACK, MEM_RED} color; | |
177c0ea7 | 362 | |
877935b1 GM |
363 | /* Memory type. */ |
364 | enum mem_type type; | |
365 | }; | |
366 | ||
367 | /* Base address of stack. Set in main. */ | |
368 | ||
369 | Lisp_Object *stack_base; | |
370 | ||
371 | /* Root of the tree describing allocated Lisp memory. */ | |
372 | ||
373 | static struct mem_node *mem_root; | |
374 | ||
ece93c02 GM |
375 | /* Lowest and highest known address in the heap. */ |
376 | ||
377 | static void *min_heap_address, *max_heap_address; | |
378 | ||
877935b1 GM |
379 | /* Sentinel node of the tree. */ |
380 | ||
381 | static struct mem_node mem_z; | |
382 | #define MEM_NIL &mem_z | |
383 | ||
f57e2426 J |
384 | static struct mem_node *mem_insert (void *, void *, enum mem_type); |
385 | static void mem_insert_fixup (struct mem_node *); | |
386 | static void mem_rotate_left (struct mem_node *); | |
387 | static void mem_rotate_right (struct mem_node *); | |
388 | static void mem_delete (struct mem_node *); | |
389 | static void mem_delete_fixup (struct mem_node *); | |
b0ab8123 | 390 | static struct mem_node *mem_find (void *); |
34400008 | 391 | |
877935b1 | 392 | #endif /* GC_MARK_STACK || GC_MALLOC_CHECK */ |
34400008 | 393 | |
ca78dc43 PE |
394 | #ifndef DEADP |
395 | # define DEADP(x) 0 | |
396 | #endif | |
397 | ||
1f0b3fd2 GM |
398 | /* Recording what needs to be marked for gc. */ |
399 | ||
400 | struct gcpro *gcprolist; | |
401 | ||
379b98b1 PE |
402 | /* Addresses of staticpro'd variables. Initialize it to a nonzero |
403 | value; otherwise some compilers put it into BSS. */ | |
1f0b3fd2 | 404 | |
4195afc3 | 405 | enum { NSTATICS = 2048 }; |
d3d47262 | 406 | static Lisp_Object *staticvec[NSTATICS] = {&Vpurify_flag}; |
1f0b3fd2 GM |
407 | |
408 | /* Index of next unused slot in staticvec. */ | |
409 | ||
fff62aa9 | 410 | static int staticidx; |
1f0b3fd2 | 411 | |
261cb4bb | 412 | static void *pure_alloc (size_t, int); |
1f0b3fd2 | 413 | |
df5b4930 PE |
414 | /* Return X rounded to the next multiple of Y. Arguments should not |
415 | have side effects, as they are evaluated more than once. Assume X | |
416 | + Y - 1 does not overflow. Tune for Y being a power of 2. */ | |
1f0b3fd2 | 417 | |
df5b4930 PE |
418 | #define ROUNDUP(x, y) ((y) & ((y) - 1) \ |
419 | ? ((x) + (y) - 1) - ((x) + (y) - 1) % (y) \ | |
420 | : ((x) + (y) - 1) & ~ ((y) - 1)) | |
1f0b3fd2 | 421 | |
df5b4930 PE |
422 | /* Return PTR rounded up to the next multiple of ALIGNMENT. */ |
423 | ||
424 | static void * | |
425 | ALIGN (void *ptr, int alignment) | |
426 | { | |
427 | return (void *) ROUNDUP ((uintptr_t) ptr, alignment); | |
428 | } | |
1f0b3fd2 | 429 | |
84575e67 PE |
430 | static void |
431 | XFLOAT_INIT (Lisp_Object f, double n) | |
432 | { | |
433 | XFLOAT (f)->u.data = n; | |
434 | } | |
ece93c02 | 435 | |
f20b8315 DC |
436 | static bool |
437 | pointers_fit_in_lispobj_p (void) | |
438 | { | |
439 | return (UINTPTR_MAX <= VAL_MAX) || USE_LSB_TAG; | |
440 | } | |
441 | ||
442 | static bool | |
443 | mmap_lisp_allowed_p (void) | |
444 | { | |
445 | /* If we can't store all memory addresses in our lisp objects, it's | |
446 | risky to let the heap use mmap and give us addresses from all | |
447 | over our address space. We also can't use mmap for lisp objects | |
448 | if we might dump: unexec doesn't preserve the contents of mmaped | |
449 | regions. */ | |
450 | return pointers_fit_in_lispobj_p () && !might_dump; | |
451 | } | |
452 | ||
7146af97 | 453 | \f |
34400008 GM |
454 | /************************************************************************ |
455 | Malloc | |
456 | ************************************************************************/ | |
457 | ||
4455ad75 | 458 | /* Function malloc calls this if it finds we are near exhausting storage. */ |
d457598b AS |
459 | |
460 | void | |
a8fe7202 | 461 | malloc_warning (const char *str) |
7146af97 JB |
462 | { |
463 | pending_malloc_warning = str; | |
464 | } | |
465 | ||
34400008 | 466 | |
4455ad75 | 467 | /* Display an already-pending malloc warning. */ |
34400008 | 468 | |
d457598b | 469 | void |
971de7fb | 470 | display_malloc_warning (void) |
7146af97 | 471 | { |
4455ad75 RS |
472 | call3 (intern ("display-warning"), |
473 | intern ("alloc"), | |
474 | build_string (pending_malloc_warning), | |
475 | intern ("emergency")); | |
7146af97 | 476 | pending_malloc_warning = 0; |
7146af97 | 477 | } |
49efed3a | 478 | \f |
276cbe5a RS |
479 | /* Called if we can't allocate relocatable space for a buffer. */ |
480 | ||
481 | void | |
d311d28c | 482 | buffer_memory_full (ptrdiff_t nbytes) |
276cbe5a | 483 | { |
2e471eb5 GM |
484 | /* If buffers use the relocating allocator, no need to free |
485 | spare_memory, because we may have plenty of malloc space left | |
486 | that we could get, and if we don't, the malloc that fails will | |
487 | itself cause spare_memory to be freed. If buffers don't use the | |
488 | relocating allocator, treat this like any other failing | |
489 | malloc. */ | |
276cbe5a RS |
490 | |
491 | #ifndef REL_ALLOC | |
531b0165 | 492 | memory_full (nbytes); |
d9df6f40 | 493 | #else |
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); |
d9df6f40 | 497 | #endif |
7146af97 JB |
498 | } |
499 | ||
f3372c87 DA |
500 | /* A common multiple of the positive integers A and B. Ideally this |
501 | would be the least common multiple, but there's no way to do that | |
502 | as a constant expression in C, so do the best that we can easily do. */ | |
503 | #define COMMON_MULTIPLE(a, b) \ | |
504 | ((a) % (b) == 0 ? (a) : (b) % (a) == 0 ? (b) : (a) * (b)) | |
34400008 | 505 | |
c9d624c6 | 506 | #ifndef XMALLOC_OVERRUN_CHECK |
903fe15d | 507 | #define XMALLOC_OVERRUN_CHECK_OVERHEAD 0 |
c9d624c6 | 508 | #else |
212f33f1 | 509 | |
903fe15d PE |
510 | /* Check for overrun in malloc'ed buffers by wrapping a header and trailer |
511 | around each block. | |
bdbed949 | 512 | |
f701dc2a PE |
513 | The header consists of XMALLOC_OVERRUN_CHECK_SIZE fixed bytes |
514 | followed by XMALLOC_OVERRUN_SIZE_SIZE bytes containing the original | |
515 | block size in little-endian order. The trailer consists of | |
516 | XMALLOC_OVERRUN_CHECK_SIZE fixed bytes. | |
bdbed949 KS |
517 | |
518 | The header is used to detect whether this block has been allocated | |
f701dc2a PE |
519 | through these functions, as some low-level libc functions may |
520 | bypass the malloc hooks. */ | |
bdbed949 | 521 | |
212f33f1 | 522 | #define XMALLOC_OVERRUN_CHECK_SIZE 16 |
903fe15d | 523 | #define XMALLOC_OVERRUN_CHECK_OVERHEAD \ |
38532ce6 PE |
524 | (2 * XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE) |
525 | ||
526 | /* Define XMALLOC_OVERRUN_SIZE_SIZE so that (1) it's large enough to | |
f701dc2a PE |
527 | hold a size_t value and (2) the header size is a multiple of the |
528 | alignment that Emacs needs for C types and for USE_LSB_TAG. */ | |
529 | #define XMALLOC_BASE_ALIGNMENT \ | |
e32a5799 | 530 | alignof (union { long double d; intmax_t i; void *p; }) |
f3372c87 | 531 | |
bfe3e0a2 | 532 | #if USE_LSB_TAG |
f701dc2a | 533 | # define XMALLOC_HEADER_ALIGNMENT \ |
2b90362b | 534 | COMMON_MULTIPLE (GCALIGNMENT, XMALLOC_BASE_ALIGNMENT) |
38532ce6 PE |
535 | #else |
536 | # define XMALLOC_HEADER_ALIGNMENT XMALLOC_BASE_ALIGNMENT | |
537 | #endif | |
538 | #define XMALLOC_OVERRUN_SIZE_SIZE \ | |
f701dc2a PE |
539 | (((XMALLOC_OVERRUN_CHECK_SIZE + sizeof (size_t) \ |
540 | + XMALLOC_HEADER_ALIGNMENT - 1) \ | |
541 | / XMALLOC_HEADER_ALIGNMENT * XMALLOC_HEADER_ALIGNMENT) \ | |
542 | - XMALLOC_OVERRUN_CHECK_SIZE) | |
bdbed949 | 543 | |
903fe15d PE |
544 | static char const xmalloc_overrun_check_header[XMALLOC_OVERRUN_CHECK_SIZE] = |
545 | { '\x9a', '\x9b', '\xae', '\xaf', | |
546 | '\xbf', '\xbe', '\xce', '\xcf', | |
547 | '\xea', '\xeb', '\xec', '\xed', | |
548 | '\xdf', '\xde', '\x9c', '\x9d' }; | |
212f33f1 | 549 | |
903fe15d PE |
550 | static char const xmalloc_overrun_check_trailer[XMALLOC_OVERRUN_CHECK_SIZE] = |
551 | { '\xaa', '\xab', '\xac', '\xad', | |
552 | '\xba', '\xbb', '\xbc', '\xbd', | |
553 | '\xca', '\xcb', '\xcc', '\xcd', | |
554 | '\xda', '\xdb', '\xdc', '\xdd' }; | |
212f33f1 | 555 | |
903fe15d | 556 | /* Insert and extract the block size in the header. */ |
bdbed949 | 557 | |
903fe15d PE |
558 | static void |
559 | xmalloc_put_size (unsigned char *ptr, size_t size) | |
560 | { | |
561 | int i; | |
38532ce6 | 562 | for (i = 0; i < XMALLOC_OVERRUN_SIZE_SIZE; i++) |
903fe15d | 563 | { |
38532ce6 | 564 | *--ptr = size & ((1 << CHAR_BIT) - 1); |
903fe15d PE |
565 | size >>= CHAR_BIT; |
566 | } | |
567 | } | |
bdbed949 | 568 | |
903fe15d PE |
569 | static size_t |
570 | xmalloc_get_size (unsigned char *ptr) | |
571 | { | |
572 | size_t size = 0; | |
573 | int i; | |
38532ce6 PE |
574 | ptr -= XMALLOC_OVERRUN_SIZE_SIZE; |
575 | for (i = 0; i < XMALLOC_OVERRUN_SIZE_SIZE; i++) | |
903fe15d PE |
576 | { |
577 | size <<= CHAR_BIT; | |
578 | size += *ptr++; | |
579 | } | |
580 | return size; | |
581 | } | |
bdbed949 KS |
582 | |
583 | ||
584 | /* Like malloc, but wraps allocated block with header and trailer. */ | |
585 | ||
261cb4bb | 586 | static void * |
e7974947 | 587 | overrun_check_malloc (size_t size) |
212f33f1 | 588 | { |
bdbed949 | 589 | register unsigned char *val; |
0caaedb1 | 590 | if (SIZE_MAX - XMALLOC_OVERRUN_CHECK_OVERHEAD < size) |
1088b922 | 591 | emacs_abort (); |
212f33f1 | 592 | |
0caaedb1 PE |
593 | val = malloc (size + XMALLOC_OVERRUN_CHECK_OVERHEAD); |
594 | if (val) | |
212f33f1 | 595 | { |
903fe15d | 596 | memcpy (val, xmalloc_overrun_check_header, XMALLOC_OVERRUN_CHECK_SIZE); |
38532ce6 | 597 | val += XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
903fe15d | 598 | xmalloc_put_size (val, size); |
72af86bd AS |
599 | memcpy (val + size, xmalloc_overrun_check_trailer, |
600 | XMALLOC_OVERRUN_CHECK_SIZE); | |
212f33f1 | 601 | } |
261cb4bb | 602 | return val; |
212f33f1 KS |
603 | } |
604 | ||
bdbed949 KS |
605 | |
606 | /* Like realloc, but checks old block for overrun, and wraps new block | |
607 | with header and trailer. */ | |
608 | ||
261cb4bb PE |
609 | static void * |
610 | overrun_check_realloc (void *block, size_t size) | |
212f33f1 | 611 | { |
e7974947 | 612 | register unsigned char *val = (unsigned char *) block; |
0caaedb1 | 613 | if (SIZE_MAX - XMALLOC_OVERRUN_CHECK_OVERHEAD < size) |
1088b922 | 614 | emacs_abort (); |
212f33f1 KS |
615 | |
616 | if (val | |
72af86bd | 617 | && memcmp (xmalloc_overrun_check_header, |
38532ce6 | 618 | val - XMALLOC_OVERRUN_CHECK_SIZE - XMALLOC_OVERRUN_SIZE_SIZE, |
903fe15d | 619 | XMALLOC_OVERRUN_CHECK_SIZE) == 0) |
212f33f1 | 620 | { |
903fe15d | 621 | size_t osize = xmalloc_get_size (val); |
72af86bd AS |
622 | if (memcmp (xmalloc_overrun_check_trailer, val + osize, |
623 | XMALLOC_OVERRUN_CHECK_SIZE)) | |
1088b922 | 624 | emacs_abort (); |
72af86bd | 625 | memset (val + osize, 0, XMALLOC_OVERRUN_CHECK_SIZE); |
38532ce6 PE |
626 | val -= XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
627 | memset (val, 0, XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE); | |
212f33f1 KS |
628 | } |
629 | ||
0caaedb1 | 630 | val = realloc (val, size + XMALLOC_OVERRUN_CHECK_OVERHEAD); |
212f33f1 | 631 | |
0caaedb1 | 632 | if (val) |
212f33f1 | 633 | { |
903fe15d | 634 | memcpy (val, xmalloc_overrun_check_header, XMALLOC_OVERRUN_CHECK_SIZE); |
38532ce6 | 635 | val += XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
903fe15d | 636 | xmalloc_put_size (val, size); |
72af86bd AS |
637 | memcpy (val + size, xmalloc_overrun_check_trailer, |
638 | XMALLOC_OVERRUN_CHECK_SIZE); | |
212f33f1 | 639 | } |
261cb4bb | 640 | return val; |
212f33f1 KS |
641 | } |
642 | ||
bdbed949 KS |
643 | /* Like free, but checks block for overrun. */ |
644 | ||
2538aa2f | 645 | static void |
261cb4bb | 646 | overrun_check_free (void *block) |
212f33f1 | 647 | { |
e7974947 | 648 | unsigned char *val = (unsigned char *) block; |
212f33f1 KS |
649 | |
650 | if (val | |
72af86bd | 651 | && memcmp (xmalloc_overrun_check_header, |
38532ce6 | 652 | val - XMALLOC_OVERRUN_CHECK_SIZE - XMALLOC_OVERRUN_SIZE_SIZE, |
903fe15d | 653 | XMALLOC_OVERRUN_CHECK_SIZE) == 0) |
212f33f1 | 654 | { |
903fe15d | 655 | size_t osize = xmalloc_get_size (val); |
72af86bd AS |
656 | if (memcmp (xmalloc_overrun_check_trailer, val + osize, |
657 | XMALLOC_OVERRUN_CHECK_SIZE)) | |
1088b922 | 658 | emacs_abort (); |
454d7973 | 659 | #ifdef XMALLOC_CLEAR_FREE_MEMORY |
38532ce6 | 660 | val -= XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
903fe15d | 661 | memset (val, 0xff, osize + XMALLOC_OVERRUN_CHECK_OVERHEAD); |
454d7973 | 662 | #else |
72af86bd | 663 | memset (val + osize, 0, XMALLOC_OVERRUN_CHECK_SIZE); |
38532ce6 PE |
664 | val -= XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
665 | memset (val, 0, XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE); | |
454d7973 | 666 | #endif |
212f33f1 KS |
667 | } |
668 | ||
669 | free (val); | |
670 | } | |
671 | ||
672 | #undef malloc | |
673 | #undef realloc | |
674 | #undef free | |
675 | #define malloc overrun_check_malloc | |
676 | #define realloc overrun_check_realloc | |
677 | #define free overrun_check_free | |
678 | #endif | |
679 | ||
0caaedb1 PE |
680 | /* If compiled with XMALLOC_BLOCK_INPUT_CHECK, define a symbol |
681 | BLOCK_INPUT_IN_MEMORY_ALLOCATORS that is visible to the debugger. | |
682 | If that variable is set, block input while in one of Emacs's memory | |
683 | allocation functions. There should be no need for this debugging | |
684 | option, since signal handlers do not allocate memory, but Emacs | |
685 | formerly allocated memory in signal handlers and this compile-time | |
686 | option remains as a way to help debug the issue should it rear its | |
687 | ugly head again. */ | |
688 | #ifdef XMALLOC_BLOCK_INPUT_CHECK | |
689 | bool block_input_in_memory_allocators EXTERNALLY_VISIBLE; | |
690 | static void | |
691 | malloc_block_input (void) | |
692 | { | |
693 | if (block_input_in_memory_allocators) | |
4d7e6e51 | 694 | block_input (); |
0caaedb1 PE |
695 | } |
696 | static void | |
697 | malloc_unblock_input (void) | |
698 | { | |
699 | if (block_input_in_memory_allocators) | |
4d7e6e51 | 700 | unblock_input (); |
0caaedb1 PE |
701 | } |
702 | # define MALLOC_BLOCK_INPUT malloc_block_input () | |
703 | # define MALLOC_UNBLOCK_INPUT malloc_unblock_input () | |
dafc79fa | 704 | #else |
0caaedb1 PE |
705 | # define MALLOC_BLOCK_INPUT ((void) 0) |
706 | # define MALLOC_UNBLOCK_INPUT ((void) 0) | |
dafc79fa | 707 | #endif |
bdbed949 | 708 | |
3a880af4 SM |
709 | #define MALLOC_PROBE(size) \ |
710 | do { \ | |
711 | if (profiler_memory_running) \ | |
712 | malloc_probe (size); \ | |
713 | } while (0) | |
714 | ||
715 | ||
34400008 | 716 | /* Like malloc but check for no memory and block interrupt input.. */ |
7146af97 | 717 | |
261cb4bb | 718 | void * |
971de7fb | 719 | xmalloc (size_t size) |
7146af97 | 720 | { |
261cb4bb | 721 | void *val; |
7146af97 | 722 | |
dafc79fa | 723 | MALLOC_BLOCK_INPUT; |
261cb4bb | 724 | val = malloc (size); |
dafc79fa | 725 | MALLOC_UNBLOCK_INPUT; |
7146af97 | 726 | |
2e471eb5 | 727 | if (!val && size) |
531b0165 | 728 | memory_full (size); |
c2d7786e | 729 | MALLOC_PROBE (size); |
7146af97 JB |
730 | return val; |
731 | } | |
732 | ||
23f86fce DA |
733 | /* Like the above, but zeroes out the memory just allocated. */ |
734 | ||
735 | void * | |
736 | xzalloc (size_t size) | |
737 | { | |
738 | void *val; | |
739 | ||
740 | MALLOC_BLOCK_INPUT; | |
741 | val = malloc (size); | |
742 | MALLOC_UNBLOCK_INPUT; | |
743 | ||
744 | if (!val && size) | |
745 | memory_full (size); | |
746 | memset (val, 0, size); | |
c2d7786e | 747 | MALLOC_PROBE (size); |
23f86fce DA |
748 | return val; |
749 | } | |
34400008 GM |
750 | |
751 | /* Like realloc but check for no memory and block interrupt input.. */ | |
752 | ||
261cb4bb PE |
753 | void * |
754 | xrealloc (void *block, size_t size) | |
7146af97 | 755 | { |
261cb4bb | 756 | void *val; |
7146af97 | 757 | |
dafc79fa | 758 | MALLOC_BLOCK_INPUT; |
56d2031b JB |
759 | /* We must call malloc explicitly when BLOCK is 0, since some |
760 | reallocs don't do this. */ | |
761 | if (! block) | |
261cb4bb | 762 | val = malloc (size); |
f048679d | 763 | else |
261cb4bb | 764 | val = realloc (block, size); |
dafc79fa | 765 | MALLOC_UNBLOCK_INPUT; |
7146af97 | 766 | |
531b0165 PE |
767 | if (!val && size) |
768 | memory_full (size); | |
c2d7786e | 769 | MALLOC_PROBE (size); |
7146af97 JB |
770 | return val; |
771 | } | |
9ac0d9e0 | 772 | |
34400008 | 773 | |
005ca5c7 | 774 | /* Like free but block interrupt input. */ |
34400008 | 775 | |
9ac0d9e0 | 776 | void |
261cb4bb | 777 | xfree (void *block) |
9ac0d9e0 | 778 | { |
70fdbb46 JM |
779 | if (!block) |
780 | return; | |
dafc79fa | 781 | MALLOC_BLOCK_INPUT; |
9ac0d9e0 | 782 | free (block); |
dafc79fa | 783 | MALLOC_UNBLOCK_INPUT; |
24d8a105 | 784 | /* We don't call refill_memory_reserve here |
0caaedb1 | 785 | because in practice the call in r_alloc_free seems to suffice. */ |
9ac0d9e0 JB |
786 | } |
787 | ||
c8099634 | 788 | |
0065d054 PE |
789 | /* Other parts of Emacs pass large int values to allocator functions |
790 | expecting ptrdiff_t. This is portable in practice, but check it to | |
791 | be safe. */ | |
792 | verify (INT_MAX <= PTRDIFF_MAX); | |
793 | ||
794 | ||
795 | /* Allocate an array of NITEMS items, each of size ITEM_SIZE. | |
796 | Signal an error on memory exhaustion, and block interrupt input. */ | |
797 | ||
798 | void * | |
799 | xnmalloc (ptrdiff_t nitems, ptrdiff_t item_size) | |
800 | { | |
a54e2c05 | 801 | eassert (0 <= nitems && 0 < item_size); |
0065d054 PE |
802 | if (min (PTRDIFF_MAX, SIZE_MAX) / item_size < nitems) |
803 | memory_full (SIZE_MAX); | |
804 | return xmalloc (nitems * item_size); | |
805 | } | |
806 | ||
807 | ||
808 | /* Reallocate an array PA to make it of NITEMS items, each of size ITEM_SIZE. | |
809 | Signal an error on memory exhaustion, and block interrupt input. */ | |
810 | ||
811 | void * | |
812 | xnrealloc (void *pa, ptrdiff_t nitems, ptrdiff_t item_size) | |
813 | { | |
a54e2c05 | 814 | eassert (0 <= nitems && 0 < item_size); |
0065d054 PE |
815 | if (min (PTRDIFF_MAX, SIZE_MAX) / item_size < nitems) |
816 | memory_full (SIZE_MAX); | |
817 | return xrealloc (pa, nitems * item_size); | |
818 | } | |
819 | ||
820 | ||
821 | /* Grow PA, which points to an array of *NITEMS items, and return the | |
822 | location of the reallocated array, updating *NITEMS to reflect its | |
823 | new size. The new array will contain at least NITEMS_INCR_MIN more | |
824 | items, but will not contain more than NITEMS_MAX items total. | |
825 | ITEM_SIZE is the size of each item, in bytes. | |
826 | ||
827 | ITEM_SIZE and NITEMS_INCR_MIN must be positive. *NITEMS must be | |
828 | nonnegative. If NITEMS_MAX is -1, it is treated as if it were | |
829 | infinity. | |
830 | ||
831 | If PA is null, then allocate a new array instead of reallocating | |
2dd2e622 | 832 | the old one. |
0065d054 PE |
833 | |
834 | Block interrupt input as needed. If memory exhaustion occurs, set | |
835 | *NITEMS to zero if PA is null, and signal an error (i.e., do not | |
2dd2e622 PE |
836 | return). |
837 | ||
838 | Thus, to grow an array A without saving its old contents, do | |
839 | { xfree (A); A = NULL; A = xpalloc (NULL, &AITEMS, ...); }. | |
840 | The A = NULL avoids a dangling pointer if xpalloc exhausts memory | |
841 | and signals an error, and later this code is reexecuted and | |
842 | attempts to free A. */ | |
0065d054 PE |
843 | |
844 | void * | |
845 | xpalloc (void *pa, ptrdiff_t *nitems, ptrdiff_t nitems_incr_min, | |
846 | ptrdiff_t nitems_max, ptrdiff_t item_size) | |
847 | { | |
848 | /* The approximate size to use for initial small allocation | |
849 | requests. This is the largest "small" request for the GNU C | |
850 | library malloc. */ | |
851 | enum { DEFAULT_MXFAST = 64 * sizeof (size_t) / 4 }; | |
852 | ||
853 | /* If the array is tiny, grow it to about (but no greater than) | |
854 | DEFAULT_MXFAST bytes. Otherwise, grow it by about 50%. */ | |
855 | ptrdiff_t n = *nitems; | |
856 | ptrdiff_t tiny_max = DEFAULT_MXFAST / item_size - n; | |
857 | ptrdiff_t half_again = n >> 1; | |
858 | ptrdiff_t incr_estimate = max (tiny_max, half_again); | |
859 | ||
860 | /* Adjust the increment according to three constraints: NITEMS_INCR_MIN, | |
861 | NITEMS_MAX, and what the C language can represent safely. */ | |
862 | ptrdiff_t C_language_max = min (PTRDIFF_MAX, SIZE_MAX) / item_size; | |
863 | ptrdiff_t n_max = (0 <= nitems_max && nitems_max < C_language_max | |
864 | ? nitems_max : C_language_max); | |
865 | ptrdiff_t nitems_incr_max = n_max - n; | |
866 | ptrdiff_t incr = max (nitems_incr_min, min (incr_estimate, nitems_incr_max)); | |
867 | ||
7216e43b | 868 | eassert (0 < item_size && 0 < nitems_incr_min && 0 <= n && -1 <= nitems_max); |
0065d054 PE |
869 | if (! pa) |
870 | *nitems = 0; | |
871 | if (nitems_incr_max < incr) | |
872 | memory_full (SIZE_MAX); | |
873 | n += incr; | |
874 | pa = xrealloc (pa, n * item_size); | |
875 | *nitems = n; | |
876 | return pa; | |
877 | } | |
878 | ||
879 | ||
dca7c6a8 GM |
880 | /* Like strdup, but uses xmalloc. */ |
881 | ||
882 | char * | |
971de7fb | 883 | xstrdup (const char *s) |
dca7c6a8 | 884 | { |
9acc1074 | 885 | ptrdiff_t size; |
309f24d1 | 886 | eassert (s); |
9acc1074 PE |
887 | size = strlen (s) + 1; |
888 | return memcpy (xmalloc (size), s, size); | |
dca7c6a8 GM |
889 | } |
890 | ||
5b71542d DA |
891 | /* Like above, but duplicates Lisp string to C string. */ |
892 | ||
893 | char * | |
894 | xlispstrdup (Lisp_Object string) | |
895 | { | |
896 | ptrdiff_t size = SBYTES (string) + 1; | |
897 | return memcpy (xmalloc (size), SSDATA (string), size); | |
898 | } | |
899 | ||
8268febf PE |
900 | /* Assign to *PTR a copy of STRING, freeing any storage *PTR formerly |
901 | pointed to. If STRING is null, assign it without copying anything. | |
902 | Allocate before freeing, to avoid a dangling pointer if allocation | |
903 | fails. */ | |
904 | ||
905 | void | |
906 | dupstring (char **ptr, char const *string) | |
907 | { | |
908 | char *old = *ptr; | |
909 | *ptr = string ? xstrdup (string) : 0; | |
910 | xfree (old); | |
911 | } | |
912 | ||
913 | ||
5745a7df PE |
914 | /* Like putenv, but (1) use the equivalent of xmalloc and (2) the |
915 | argument is a const pointer. */ | |
916 | ||
917 | void | |
918 | xputenv (char const *string) | |
919 | { | |
920 | if (putenv ((char *) string) != 0) | |
921 | memory_full (0); | |
922 | } | |
dca7c6a8 | 923 | |
98c6f1e3 PE |
924 | /* Return a newly allocated memory block of SIZE bytes, remembering |
925 | to free it when unwinding. */ | |
926 | void * | |
927 | record_xmalloc (size_t size) | |
928 | { | |
929 | void *p = xmalloc (size); | |
27e498e6 | 930 | record_unwind_protect_ptr (xfree, p); |
98c6f1e3 PE |
931 | return p; |
932 | } | |
933 | ||
f61bef8b | 934 | |
34400008 GM |
935 | /* Like malloc but used for allocating Lisp data. NBYTES is the |
936 | number of bytes to allocate, TYPE describes the intended use of the | |
91af3942 | 937 | allocated memory block (for strings, for conses, ...). */ |
34400008 | 938 | |
bfe3e0a2 PE |
939 | #if ! USE_LSB_TAG |
940 | void *lisp_malloc_loser EXTERNALLY_VISIBLE; | |
212f33f1 | 941 | #endif |
918a23a7 | 942 | |
261cb4bb | 943 | static void * |
971de7fb | 944 | lisp_malloc (size_t nbytes, enum mem_type type) |
c8099634 | 945 | { |
34400008 | 946 | register void *val; |
c8099634 | 947 | |
dafc79fa | 948 | MALLOC_BLOCK_INPUT; |
877935b1 GM |
949 | |
950 | #ifdef GC_MALLOC_CHECK | |
951 | allocated_mem_type = type; | |
952 | #endif | |
177c0ea7 | 953 | |
38182d90 | 954 | val = malloc (nbytes); |
c8099634 | 955 | |
bfe3e0a2 | 956 | #if ! USE_LSB_TAG |
918a23a7 RS |
957 | /* If the memory just allocated cannot be addressed thru a Lisp |
958 | object's pointer, and it needs to be, | |
959 | that's equivalent to running out of memory. */ | |
960 | if (val && type != MEM_TYPE_NON_LISP) | |
961 | { | |
962 | Lisp_Object tem; | |
963 | XSETCONS (tem, (char *) val + nbytes - 1); | |
964 | if ((char *) XCONS (tem) != (char *) val + nbytes - 1) | |
965 | { | |
966 | lisp_malloc_loser = val; | |
967 | free (val); | |
968 | val = 0; | |
969 | } | |
970 | } | |
6b61353c | 971 | #endif |
918a23a7 | 972 | |
877935b1 | 973 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK |
dca7c6a8 | 974 | if (val && type != MEM_TYPE_NON_LISP) |
34400008 GM |
975 | mem_insert (val, (char *) val + nbytes, type); |
976 | #endif | |
177c0ea7 | 977 | |
dafc79fa | 978 | MALLOC_UNBLOCK_INPUT; |
dca7c6a8 | 979 | if (!val && nbytes) |
531b0165 | 980 | memory_full (nbytes); |
c2d7786e | 981 | MALLOC_PROBE (nbytes); |
c8099634 RS |
982 | return val; |
983 | } | |
984 | ||
34400008 GM |
985 | /* Free BLOCK. This must be called to free memory allocated with a |
986 | call to lisp_malloc. */ | |
987 | ||
bf952fb6 | 988 | static void |
261cb4bb | 989 | lisp_free (void *block) |
c8099634 | 990 | { |
dafc79fa | 991 | MALLOC_BLOCK_INPUT; |
c8099634 | 992 | free (block); |
877935b1 | 993 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK |
34400008 GM |
994 | mem_delete (mem_find (block)); |
995 | #endif | |
dafc79fa | 996 | MALLOC_UNBLOCK_INPUT; |
c8099634 | 997 | } |
34400008 | 998 | |
453b951e SM |
999 | /***** Allocation of aligned blocks of memory to store Lisp data. *****/ |
1000 | ||
1001 | /* The entry point is lisp_align_malloc which returns blocks of at most | |
1002 | BLOCK_BYTES and guarantees they are aligned on a BLOCK_ALIGN boundary. */ | |
ab6780cd | 1003 | |
e76119d7 PE |
1004 | /* Use aligned_alloc if it or a simple substitute is available. |
1005 | Address sanitization breaks aligned allocation, as of gcc 4.8.2 and | |
1006 | clang 3.3 anyway. */ | |
1007 | ||
1008 | #if ! ADDRESS_SANITIZER | |
1009 | # if !defined SYSTEM_MALLOC && !defined DOUG_LEA_MALLOC | |
1010 | # define USE_ALIGNED_ALLOC 1 | |
aea07e2c PE |
1011 | /* Defined in gmalloc.c. */ |
1012 | void *aligned_alloc (size_t, size_t); | |
e76119d7 PE |
1013 | # elif defined HAVE_ALIGNED_ALLOC |
1014 | # define USE_ALIGNED_ALLOC 1 | |
1015 | # elif defined HAVE_POSIX_MEMALIGN | |
1016 | # define USE_ALIGNED_ALLOC 1 | |
aea07e2c PE |
1017 | static void * |
1018 | aligned_alloc (size_t alignment, size_t size) | |
1019 | { | |
1020 | void *p; | |
1021 | return posix_memalign (&p, alignment, size) == 0 ? p : 0; | |
1022 | } | |
e76119d7 | 1023 | # endif |
b4181b01 | 1024 | #endif |
ab6780cd SM |
1025 | |
1026 | /* BLOCK_ALIGN has to be a power of 2. */ | |
1027 | #define BLOCK_ALIGN (1 << 10) | |
ab6780cd SM |
1028 | |
1029 | /* Padding to leave at the end of a malloc'd block. This is to give | |
1030 | malloc a chance to minimize the amount of memory wasted to alignment. | |
1031 | It should be tuned to the particular malloc library used. | |
19bcad1f | 1032 | On glibc-2.3.2, malloc never tries to align, so a padding of 0 is best. |
aea07e2c | 1033 | aligned_alloc on the other hand would ideally prefer a value of 4 |
19bcad1f | 1034 | because otherwise, there's 1020 bytes wasted between each ablocks. |
f501ccb4 SM |
1035 | In Emacs, testing shows that those 1020 can most of the time be |
1036 | efficiently used by malloc to place other objects, so a value of 0 can | |
1037 | still preferable unless you have a lot of aligned blocks and virtually | |
1038 | nothing else. */ | |
19bcad1f SM |
1039 | #define BLOCK_PADDING 0 |
1040 | #define BLOCK_BYTES \ | |
0b432f21 | 1041 | (BLOCK_ALIGN - sizeof (struct ablocks *) - BLOCK_PADDING) |
19bcad1f SM |
1042 | |
1043 | /* Internal data structures and constants. */ | |
1044 | ||
ab6780cd SM |
1045 | #define ABLOCKS_SIZE 16 |
1046 | ||
1047 | /* An aligned block of memory. */ | |
1048 | struct ablock | |
1049 | { | |
1050 | union | |
1051 | { | |
1052 | char payload[BLOCK_BYTES]; | |
1053 | struct ablock *next_free; | |
1054 | } x; | |
1055 | /* `abase' is the aligned base of the ablocks. */ | |
1056 | /* It is overloaded to hold the virtual `busy' field that counts | |
1057 | the number of used ablock in the parent ablocks. | |
1058 | The first ablock has the `busy' field, the others have the `abase' | |
1059 | field. To tell the difference, we assume that pointers will have | |
1060 | integer values larger than 2 * ABLOCKS_SIZE. The lowest bit of `busy' | |
1061 | is used to tell whether the real base of the parent ablocks is `abase' | |
1062 | (if not, the word before the first ablock holds a pointer to the | |
1063 | real base). */ | |
1064 | struct ablocks *abase; | |
1065 | /* The padding of all but the last ablock is unused. The padding of | |
1066 | the last ablock in an ablocks is not allocated. */ | |
19bcad1f SM |
1067 | #if BLOCK_PADDING |
1068 | char padding[BLOCK_PADDING]; | |
ebb8d410 | 1069 | #endif |
ab6780cd SM |
1070 | }; |
1071 | ||
1072 | /* A bunch of consecutive aligned blocks. */ | |
1073 | struct ablocks | |
1074 | { | |
1075 | struct ablock blocks[ABLOCKS_SIZE]; | |
1076 | }; | |
1077 | ||
aea07e2c | 1078 | /* Size of the block requested from malloc or aligned_alloc. */ |
19bcad1f | 1079 | #define ABLOCKS_BYTES (sizeof (struct ablocks) - BLOCK_PADDING) |
ab6780cd SM |
1080 | |
1081 | #define ABLOCK_ABASE(block) \ | |
d01a7826 | 1082 | (((uintptr_t) (block)->abase) <= (1 + 2 * ABLOCKS_SIZE) \ |
ab6780cd SM |
1083 | ? (struct ablocks *)(block) \ |
1084 | : (block)->abase) | |
1085 | ||
1086 | /* Virtual `busy' field. */ | |
1087 | #define ABLOCKS_BUSY(abase) ((abase)->blocks[0].abase) | |
1088 | ||
1089 | /* Pointer to the (not necessarily aligned) malloc block. */ | |
aea07e2c | 1090 | #ifdef USE_ALIGNED_ALLOC |
19bcad1f SM |
1091 | #define ABLOCKS_BASE(abase) (abase) |
1092 | #else | |
ab6780cd | 1093 | #define ABLOCKS_BASE(abase) \ |
7be68de5 | 1094 | (1 & (intptr_t) ABLOCKS_BUSY (abase) ? abase : ((void **)abase)[-1]) |
19bcad1f | 1095 | #endif |
ab6780cd SM |
1096 | |
1097 | /* The list of free ablock. */ | |
1098 | static struct ablock *free_ablock; | |
1099 | ||
1100 | /* Allocate an aligned block of nbytes. | |
1101 | Alignment is on a multiple of BLOCK_ALIGN and `nbytes' has to be | |
1102 | smaller or equal to BLOCK_BYTES. */ | |
261cb4bb | 1103 | static void * |
971de7fb | 1104 | lisp_align_malloc (size_t nbytes, enum mem_type type) |
ab6780cd SM |
1105 | { |
1106 | void *base, *val; | |
1107 | struct ablocks *abase; | |
1108 | ||
1109 | eassert (nbytes <= BLOCK_BYTES); | |
1110 | ||
dafc79fa | 1111 | MALLOC_BLOCK_INPUT; |
ab6780cd SM |
1112 | |
1113 | #ifdef GC_MALLOC_CHECK | |
1114 | allocated_mem_type = type; | |
1115 | #endif | |
1116 | ||
1117 | if (!free_ablock) | |
1118 | { | |
005ca5c7 | 1119 | int i; |
d01a7826 | 1120 | intptr_t aligned; /* int gets warning casting to 64-bit pointer. */ |
ab6780cd SM |
1121 | |
1122 | #ifdef DOUG_LEA_MALLOC | |
f20b8315 DC |
1123 | if (!mmap_lisp_allowed_p ()) |
1124 | mallopt (M_MMAP_MAX, 0); | |
ab6780cd SM |
1125 | #endif |
1126 | ||
aea07e2c PE |
1127 | #ifdef USE_ALIGNED_ALLOC |
1128 | abase = base = aligned_alloc (BLOCK_ALIGN, ABLOCKS_BYTES); | |
19bcad1f | 1129 | #else |
ab6780cd SM |
1130 | base = malloc (ABLOCKS_BYTES); |
1131 | abase = ALIGN (base, BLOCK_ALIGN); | |
ab349c19 RS |
1132 | #endif |
1133 | ||
6b61353c KH |
1134 | if (base == 0) |
1135 | { | |
dafc79fa | 1136 | MALLOC_UNBLOCK_INPUT; |
531b0165 | 1137 | memory_full (ABLOCKS_BYTES); |
6b61353c | 1138 | } |
ab6780cd SM |
1139 | |
1140 | aligned = (base == abase); | |
1141 | if (!aligned) | |
7be68de5 | 1142 | ((void **) abase)[-1] = base; |
ab6780cd SM |
1143 | |
1144 | #ifdef DOUG_LEA_MALLOC | |
f20b8315 DC |
1145 | if (!mmap_lisp_allowed_p ()) |
1146 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); | |
ab6780cd SM |
1147 | #endif |
1148 | ||
bfe3e0a2 | 1149 | #if ! USE_LSB_TAG |
8f924df7 KH |
1150 | /* If the memory just allocated cannot be addressed thru a Lisp |
1151 | object's pointer, and it needs to be, that's equivalent to | |
1152 | running out of memory. */ | |
1153 | if (type != MEM_TYPE_NON_LISP) | |
1154 | { | |
1155 | Lisp_Object tem; | |
1156 | char *end = (char *) base + ABLOCKS_BYTES - 1; | |
1157 | XSETCONS (tem, end); | |
1158 | if ((char *) XCONS (tem) != end) | |
1159 | { | |
1160 | lisp_malloc_loser = base; | |
1161 | free (base); | |
dafc79fa | 1162 | MALLOC_UNBLOCK_INPUT; |
531b0165 | 1163 | memory_full (SIZE_MAX); |
8f924df7 KH |
1164 | } |
1165 | } | |
6b61353c | 1166 | #endif |
8f924df7 | 1167 | |
ab6780cd | 1168 | /* Initialize the blocks and put them on the free list. |
453b951e | 1169 | If `base' was not properly aligned, we can't use the last block. */ |
ab6780cd SM |
1170 | for (i = 0; i < (aligned ? ABLOCKS_SIZE : ABLOCKS_SIZE - 1); i++) |
1171 | { | |
1172 | abase->blocks[i].abase = abase; | |
1173 | abase->blocks[i].x.next_free = free_ablock; | |
1174 | free_ablock = &abase->blocks[i]; | |
1175 | } | |
8ac068ac | 1176 | ABLOCKS_BUSY (abase) = (struct ablocks *) aligned; |
ab6780cd | 1177 | |
d01a7826 | 1178 | eassert (0 == ((uintptr_t) abase) % BLOCK_ALIGN); |
ab6780cd SM |
1179 | eassert (ABLOCK_ABASE (&abase->blocks[3]) == abase); /* 3 is arbitrary */ |
1180 | eassert (ABLOCK_ABASE (&abase->blocks[0]) == abase); | |
1181 | eassert (ABLOCKS_BASE (abase) == base); | |
d01a7826 | 1182 | eassert (aligned == (intptr_t) ABLOCKS_BUSY (abase)); |
ab6780cd SM |
1183 | } |
1184 | ||
1185 | abase = ABLOCK_ABASE (free_ablock); | |
caecb91c SM |
1186 | ABLOCKS_BUSY (abase) |
1187 | = (struct ablocks *) (2 + (intptr_t) ABLOCKS_BUSY (abase)); | |
ab6780cd SM |
1188 | val = free_ablock; |
1189 | free_ablock = free_ablock->x.next_free; | |
1190 | ||
ab6780cd | 1191 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK |
3687c2ef | 1192 | if (type != MEM_TYPE_NON_LISP) |
ab6780cd SM |
1193 | mem_insert (val, (char *) val + nbytes, type); |
1194 | #endif | |
1195 | ||
dafc79fa | 1196 | MALLOC_UNBLOCK_INPUT; |
ab6780cd | 1197 | |
c2d7786e TM |
1198 | MALLOC_PROBE (nbytes); |
1199 | ||
d01a7826 | 1200 | eassert (0 == ((uintptr_t) val) % BLOCK_ALIGN); |
ab6780cd SM |
1201 | return val; |
1202 | } | |
1203 | ||
1204 | static void | |
261cb4bb | 1205 | lisp_align_free (void *block) |
ab6780cd SM |
1206 | { |
1207 | struct ablock *ablock = block; | |
1208 | struct ablocks *abase = ABLOCK_ABASE (ablock); | |
1209 | ||
dafc79fa | 1210 | MALLOC_BLOCK_INPUT; |
ab6780cd SM |
1211 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK |
1212 | mem_delete (mem_find (block)); | |
1213 | #endif | |
1214 | /* Put on free list. */ | |
1215 | ablock->x.next_free = free_ablock; | |
1216 | free_ablock = ablock; | |
1217 | /* Update busy count. */ | |
453b951e SM |
1218 | ABLOCKS_BUSY (abase) |
1219 | = (struct ablocks *) (-2 + (intptr_t) ABLOCKS_BUSY (abase)); | |
d2db1c32 | 1220 | |
d01a7826 | 1221 | if (2 > (intptr_t) ABLOCKS_BUSY (abase)) |
ab6780cd | 1222 | { /* All the blocks are free. */ |
d01a7826 | 1223 | int i = 0, aligned = (intptr_t) ABLOCKS_BUSY (abase); |
ab6780cd SM |
1224 | struct ablock **tem = &free_ablock; |
1225 | struct ablock *atop = &abase->blocks[aligned ? ABLOCKS_SIZE : ABLOCKS_SIZE - 1]; | |
1226 | ||
1227 | while (*tem) | |
1228 | { | |
1229 | if (*tem >= (struct ablock *) abase && *tem < atop) | |
1230 | { | |
1231 | i++; | |
1232 | *tem = (*tem)->x.next_free; | |
1233 | } | |
1234 | else | |
1235 | tem = &(*tem)->x.next_free; | |
1236 | } | |
1237 | eassert ((aligned & 1) == aligned); | |
1238 | eassert (i == (aligned ? ABLOCKS_SIZE : ABLOCKS_SIZE - 1)); | |
349a4500 | 1239 | #ifdef USE_POSIX_MEMALIGN |
d01a7826 | 1240 | eassert ((uintptr_t) ABLOCKS_BASE (abase) % BLOCK_ALIGN == 0); |
cfb2f32e | 1241 | #endif |
ab6780cd SM |
1242 | free (ABLOCKS_BASE (abase)); |
1243 | } | |
dafc79fa | 1244 | MALLOC_UNBLOCK_INPUT; |
ab6780cd | 1245 | } |
3ef06d12 | 1246 | |
9ac0d9e0 | 1247 | \f |
2e471eb5 GM |
1248 | /*********************************************************************** |
1249 | Interval Allocation | |
1250 | ***********************************************************************/ | |
1a4f1e2c | 1251 | |
34400008 GM |
1252 | /* Number of intervals allocated in an interval_block structure. |
1253 | The 1020 is 1024 minus malloc overhead. */ | |
1254 | ||
d5e35230 JA |
1255 | #define INTERVAL_BLOCK_SIZE \ |
1256 | ((1020 - sizeof (struct interval_block *)) / sizeof (struct interval)) | |
1257 | ||
bad98418 | 1258 | /* Intervals are allocated in chunks in the form of an interval_block |
34400008 GM |
1259 | structure. */ |
1260 | ||
d5e35230 | 1261 | struct interval_block |
2e471eb5 | 1262 | { |
6b61353c | 1263 | /* Place `intervals' first, to preserve alignment. */ |
2e471eb5 | 1264 | struct interval intervals[INTERVAL_BLOCK_SIZE]; |
6b61353c | 1265 | struct interval_block *next; |
2e471eb5 | 1266 | }; |
d5e35230 | 1267 | |
34400008 GM |
1268 | /* Current interval block. Its `next' pointer points to older |
1269 | blocks. */ | |
1270 | ||
d3d47262 | 1271 | static struct interval_block *interval_block; |
34400008 GM |
1272 | |
1273 | /* Index in interval_block above of the next unused interval | |
1274 | structure. */ | |
1275 | ||
fff62aa9 | 1276 | static int interval_block_index = INTERVAL_BLOCK_SIZE; |
34400008 GM |
1277 | |
1278 | /* Number of free and live intervals. */ | |
1279 | ||
c0c5c8ae | 1280 | static EMACS_INT total_free_intervals, total_intervals; |
d5e35230 | 1281 | |
34400008 GM |
1282 | /* List of free intervals. */ |
1283 | ||
244ed907 | 1284 | static INTERVAL interval_free_list; |
d5e35230 | 1285 | |
34400008 | 1286 | /* Return a new interval. */ |
d5e35230 JA |
1287 | |
1288 | INTERVAL | |
971de7fb | 1289 | make_interval (void) |
d5e35230 JA |
1290 | { |
1291 | INTERVAL val; | |
1292 | ||
dafc79fa | 1293 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 1294 | |
d5e35230 JA |
1295 | if (interval_free_list) |
1296 | { | |
1297 | val = interval_free_list; | |
439d5cb4 | 1298 | interval_free_list = INTERVAL_PARENT (interval_free_list); |
d5e35230 JA |
1299 | } |
1300 | else | |
1301 | { | |
1302 | if (interval_block_index == INTERVAL_BLOCK_SIZE) | |
1303 | { | |
38182d90 PE |
1304 | struct interval_block *newi |
1305 | = lisp_malloc (sizeof *newi, MEM_TYPE_NON_LISP); | |
d5e35230 | 1306 | |
d5e35230 JA |
1307 | newi->next = interval_block; |
1308 | interval_block = newi; | |
1309 | interval_block_index = 0; | |
3900d5de | 1310 | total_free_intervals += INTERVAL_BLOCK_SIZE; |
d5e35230 JA |
1311 | } |
1312 | val = &interval_block->intervals[interval_block_index++]; | |
1313 | } | |
e2984df0 | 1314 | |
dafc79fa | 1315 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 1316 | |
d5e35230 | 1317 | consing_since_gc += sizeof (struct interval); |
310ea200 | 1318 | intervals_consed++; |
3900d5de | 1319 | total_free_intervals--; |
d5e35230 | 1320 | RESET_INTERVAL (val); |
2336fe58 | 1321 | val->gcmarkbit = 0; |
d5e35230 JA |
1322 | return val; |
1323 | } | |
1324 | ||
34400008 | 1325 | |
ee28be33 | 1326 | /* Mark Lisp objects in interval I. */ |
d5e35230 JA |
1327 | |
1328 | static void | |
971de7fb | 1329 | mark_interval (register INTERVAL i, Lisp_Object dummy) |
d5e35230 | 1330 | { |
cce7fefc DA |
1331 | /* Intervals should never be shared. So, if extra internal checking is |
1332 | enabled, GC aborts if it seems to have visited an interval twice. */ | |
1333 | eassert (!i->gcmarkbit); | |
2336fe58 | 1334 | i->gcmarkbit = 1; |
49723c04 | 1335 | mark_object (i->plist); |
d5e35230 JA |
1336 | } |
1337 | ||
34400008 GM |
1338 | /* Mark the interval tree rooted in I. */ |
1339 | ||
8707c1e5 DA |
1340 | #define MARK_INTERVAL_TREE(i) \ |
1341 | do { \ | |
1342 | if (i && !i->gcmarkbit) \ | |
1343 | traverse_intervals_noorder (i, mark_interval, Qnil); \ | |
2e471eb5 | 1344 | } while (0) |
77c7bcb1 | 1345 | |
2e471eb5 GM |
1346 | /*********************************************************************** |
1347 | String Allocation | |
1348 | ***********************************************************************/ | |
1a4f1e2c | 1349 | |
2e471eb5 GM |
1350 | /* Lisp_Strings are allocated in string_block structures. When a new |
1351 | string_block is allocated, all the Lisp_Strings it contains are | |
e0fead5d | 1352 | added to a free-list string_free_list. When a new Lisp_String is |
2e471eb5 GM |
1353 | needed, it is taken from that list. During the sweep phase of GC, |
1354 | string_blocks that are entirely free are freed, except two which | |
1355 | we keep. | |
7146af97 | 1356 | |
2e471eb5 GM |
1357 | String data is allocated from sblock structures. Strings larger |
1358 | than LARGE_STRING_BYTES, get their own sblock, data for smaller | |
1359 | strings is sub-allocated out of sblocks of size SBLOCK_SIZE. | |
7146af97 | 1360 | |
2e471eb5 GM |
1361 | Sblocks consist internally of sdata structures, one for each |
1362 | Lisp_String. The sdata structure points to the Lisp_String it | |
1363 | belongs to. The Lisp_String points back to the `u.data' member of | |
1364 | its sdata structure. | |
7146af97 | 1365 | |
2e471eb5 GM |
1366 | When a Lisp_String is freed during GC, it is put back on |
1367 | string_free_list, and its `data' member and its sdata's `string' | |
1368 | pointer is set to null. The size of the string is recorded in the | |
fbe9e0b9 | 1369 | `n.nbytes' member of the sdata. So, sdata structures that are no |
2e471eb5 GM |
1370 | longer used, can be easily recognized, and it's easy to compact the |
1371 | sblocks of small strings which we do in compact_small_strings. */ | |
7146af97 | 1372 | |
2e471eb5 GM |
1373 | /* Size in bytes of an sblock structure used for small strings. This |
1374 | is 8192 minus malloc overhead. */ | |
7146af97 | 1375 | |
2e471eb5 | 1376 | #define SBLOCK_SIZE 8188 |
c8099634 | 1377 | |
2e471eb5 GM |
1378 | /* Strings larger than this are considered large strings. String data |
1379 | for large strings is allocated from individual sblocks. */ | |
7146af97 | 1380 | |
2e471eb5 GM |
1381 | #define LARGE_STRING_BYTES 1024 |
1382 | ||
91f2d272 PE |
1383 | /* The SDATA typedef is a struct or union describing string memory |
1384 | sub-allocated from an sblock. This is where the contents of Lisp | |
1385 | strings are stored. */ | |
2e471eb5 | 1386 | |
91f2d272 | 1387 | struct sdata |
7146af97 | 1388 | { |
2e471eb5 | 1389 | /* Back-pointer to the string this sdata belongs to. If null, this |
91f2d272 | 1390 | structure is free, and NBYTES (in this structure or in the union below) |
34400008 | 1391 | contains the string's byte size (the same value that STRING_BYTES |
2e471eb5 GM |
1392 | would return if STRING were non-null). If non-null, STRING_BYTES |
1393 | (STRING) is the size of the data, and DATA contains the string's | |
1394 | contents. */ | |
1395 | struct Lisp_String *string; | |
7146af97 | 1396 | |
91f2d272 | 1397 | #ifdef GC_CHECK_STRING_BYTES |
d311d28c | 1398 | ptrdiff_t nbytes; |
91f2d272 PE |
1399 | #endif |
1400 | ||
fbe9e0b9 | 1401 | unsigned char data[FLEXIBLE_ARRAY_MEMBER]; |
91f2d272 PE |
1402 | }; |
1403 | ||
1404 | #ifdef GC_CHECK_STRING_BYTES | |
177c0ea7 | 1405 | |
91f2d272 | 1406 | typedef struct sdata sdata; |
31d929e5 GM |
1407 | #define SDATA_NBYTES(S) (S)->nbytes |
1408 | #define SDATA_DATA(S) (S)->data | |
177c0ea7 | 1409 | |
fbe9e0b9 | 1410 | #else |
31d929e5 | 1411 | |
fbe9e0b9 PE |
1412 | typedef union |
1413 | { | |
1414 | struct Lisp_String *string; | |
1415 | ||
91f2d272 PE |
1416 | /* When STRING is nonnull, this union is actually of type 'struct sdata', |
1417 | which has a flexible array member. However, if implemented by | |
1418 | giving this union a member of type 'struct sdata', the union | |
1419 | could not be the last (flexible) member of 'struct sblock', | |
1420 | because C99 prohibits a flexible array member from having a type | |
1421 | that is itself a flexible array. So, comment this member out here, | |
1422 | but remember that the option's there when using this union. */ | |
1423 | #if 0 | |
1424 | struct sdata u; | |
1425 | #endif | |
2e471eb5 | 1426 | |
fbe9e0b9 PE |
1427 | /* When STRING is null. */ |
1428 | struct | |
1429 | { | |
1430 | struct Lisp_String *string; | |
d311d28c | 1431 | ptrdiff_t nbytes; |
fbe9e0b9 PE |
1432 | } n; |
1433 | } sdata; | |
177c0ea7 | 1434 | |
fbe9e0b9 | 1435 | #define SDATA_NBYTES(S) (S)->n.nbytes |
91f2d272 | 1436 | #define SDATA_DATA(S) ((struct sdata *) (S))->data |
31d929e5 GM |
1437 | |
1438 | #endif /* not GC_CHECK_STRING_BYTES */ | |
36372bf9 | 1439 | |
91f2d272 | 1440 | enum { SDATA_DATA_OFFSET = offsetof (struct sdata, data) }; |
31d929e5 | 1441 | |
2e471eb5 GM |
1442 | /* Structure describing a block of memory which is sub-allocated to |
1443 | obtain string data memory for strings. Blocks for small strings | |
1444 | are of fixed size SBLOCK_SIZE. Blocks for large strings are made | |
1445 | as large as needed. */ | |
1446 | ||
1447 | struct sblock | |
7146af97 | 1448 | { |
2e471eb5 GM |
1449 | /* Next in list. */ |
1450 | struct sblock *next; | |
7146af97 | 1451 | |
2e471eb5 GM |
1452 | /* Pointer to the next free sdata block. This points past the end |
1453 | of the sblock if there isn't any space left in this block. */ | |
fbe9e0b9 | 1454 | sdata *next_free; |
2e471eb5 | 1455 | |
91f2d272 PE |
1456 | /* String data. */ |
1457 | sdata data[FLEXIBLE_ARRAY_MEMBER]; | |
2e471eb5 GM |
1458 | }; |
1459 | ||
1460 | /* Number of Lisp strings in a string_block structure. The 1020 is | |
1461 | 1024 minus malloc overhead. */ | |
1462 | ||
19bcad1f | 1463 | #define STRING_BLOCK_SIZE \ |
2e471eb5 GM |
1464 | ((1020 - sizeof (struct string_block *)) / sizeof (struct Lisp_String)) |
1465 | ||
1466 | /* Structure describing a block from which Lisp_String structures | |
1467 | are allocated. */ | |
1468 | ||
1469 | struct string_block | |
7146af97 | 1470 | { |
6b61353c | 1471 | /* Place `strings' first, to preserve alignment. */ |
19bcad1f | 1472 | struct Lisp_String strings[STRING_BLOCK_SIZE]; |
6b61353c | 1473 | struct string_block *next; |
2e471eb5 | 1474 | }; |
7146af97 | 1475 | |
2e471eb5 GM |
1476 | /* Head and tail of the list of sblock structures holding Lisp string |
1477 | data. We always allocate from current_sblock. The NEXT pointers | |
1478 | in the sblock structures go from oldest_sblock to current_sblock. */ | |
3c06d205 | 1479 | |
2e471eb5 | 1480 | static struct sblock *oldest_sblock, *current_sblock; |
7146af97 | 1481 | |
2e471eb5 | 1482 | /* List of sblocks for large strings. */ |
7146af97 | 1483 | |
2e471eb5 | 1484 | static struct sblock *large_sblocks; |
7146af97 | 1485 | |
5a25e253 | 1486 | /* List of string_block structures. */ |
7146af97 | 1487 | |
2e471eb5 | 1488 | static struct string_block *string_blocks; |
7146af97 | 1489 | |
2e471eb5 | 1490 | /* Free-list of Lisp_Strings. */ |
7146af97 | 1491 | |
2e471eb5 | 1492 | static struct Lisp_String *string_free_list; |
7146af97 | 1493 | |
2e471eb5 | 1494 | /* Number of live and free Lisp_Strings. */ |
c8099634 | 1495 | |
c0c5c8ae | 1496 | static EMACS_INT total_strings, total_free_strings; |
7146af97 | 1497 | |
2e471eb5 GM |
1498 | /* Number of bytes used by live strings. */ |
1499 | ||
3ab6e069 | 1500 | static EMACS_INT total_string_bytes; |
2e471eb5 GM |
1501 | |
1502 | /* Given a pointer to a Lisp_String S which is on the free-list | |
1503 | string_free_list, return a pointer to its successor in the | |
1504 | free-list. */ | |
1505 | ||
1506 | #define NEXT_FREE_LISP_STRING(S) (*(struct Lisp_String **) (S)) | |
1507 | ||
1508 | /* Return a pointer to the sdata structure belonging to Lisp string S. | |
1509 | S must be live, i.e. S->data must not be null. S->data is actually | |
1510 | a pointer to the `u.data' member of its sdata structure; the | |
1511 | structure starts at a constant offset in front of that. */ | |
177c0ea7 | 1512 | |
fbe9e0b9 | 1513 | #define SDATA_OF_STRING(S) ((sdata *) ((S)->data - SDATA_DATA_OFFSET)) |
31d929e5 | 1514 | |
212f33f1 KS |
1515 | |
1516 | #ifdef GC_CHECK_STRING_OVERRUN | |
bdbed949 KS |
1517 | |
1518 | /* We check for overrun in string data blocks by appending a small | |
1519 | "cookie" after each allocated string data block, and check for the | |
8349069c | 1520 | presence of this cookie during GC. */ |
bdbed949 KS |
1521 | |
1522 | #define GC_STRING_OVERRUN_COOKIE_SIZE 4 | |
bfd1c781 PE |
1523 | static char const string_overrun_cookie[GC_STRING_OVERRUN_COOKIE_SIZE] = |
1524 | { '\xde', '\xad', '\xbe', '\xef' }; | |
bdbed949 | 1525 | |
212f33f1 | 1526 | #else |
bdbed949 | 1527 | #define GC_STRING_OVERRUN_COOKIE_SIZE 0 |
212f33f1 KS |
1528 | #endif |
1529 | ||
2e471eb5 GM |
1530 | /* Value is the size of an sdata structure large enough to hold NBYTES |
1531 | bytes of string data. The value returned includes a terminating | |
1532 | NUL byte, the size of the sdata structure, and padding. */ | |
1533 | ||
31d929e5 GM |
1534 | #ifdef GC_CHECK_STRING_BYTES |
1535 | ||
2e471eb5 | 1536 | #define SDATA_SIZE(NBYTES) \ |
36372bf9 | 1537 | ((SDATA_DATA_OFFSET \ |
2e471eb5 | 1538 | + (NBYTES) + 1 \ |
d311d28c PE |
1539 | + sizeof (ptrdiff_t) - 1) \ |
1540 | & ~(sizeof (ptrdiff_t) - 1)) | |
2e471eb5 | 1541 | |
31d929e5 GM |
1542 | #else /* not GC_CHECK_STRING_BYTES */ |
1543 | ||
f2d3008d PE |
1544 | /* The 'max' reserves space for the nbytes union member even when NBYTES + 1 is |
1545 | less than the size of that member. The 'max' is not needed when | |
d311d28c | 1546 | SDATA_DATA_OFFSET is a multiple of sizeof (ptrdiff_t), because then the |
f2d3008d PE |
1547 | alignment code reserves enough space. */ |
1548 | ||
1549 | #define SDATA_SIZE(NBYTES) \ | |
1550 | ((SDATA_DATA_OFFSET \ | |
d311d28c | 1551 | + (SDATA_DATA_OFFSET % sizeof (ptrdiff_t) == 0 \ |
f2d3008d | 1552 | ? NBYTES \ |
d311d28c | 1553 | : max (NBYTES, sizeof (ptrdiff_t) - 1)) \ |
f2d3008d | 1554 | + 1 \ |
d311d28c PE |
1555 | + sizeof (ptrdiff_t) - 1) \ |
1556 | & ~(sizeof (ptrdiff_t) - 1)) | |
31d929e5 GM |
1557 | |
1558 | #endif /* not GC_CHECK_STRING_BYTES */ | |
2e471eb5 | 1559 | |
bdbed949 KS |
1560 | /* Extra bytes to allocate for each string. */ |
1561 | ||
1562 | #define GC_STRING_EXTRA (GC_STRING_OVERRUN_COOKIE_SIZE) | |
1563 | ||
c9d624c6 PE |
1564 | /* Exact bound on the number of bytes in a string, not counting the |
1565 | terminating null. A string cannot contain more bytes than | |
1566 | STRING_BYTES_BOUND, nor can it be so long that the size_t | |
1567 | arithmetic in allocate_string_data would overflow while it is | |
1568 | calculating a value to be passed to malloc. */ | |
03a660a6 PE |
1569 | static ptrdiff_t const STRING_BYTES_MAX = |
1570 | min (STRING_BYTES_BOUND, | |
1571 | ((SIZE_MAX - XMALLOC_OVERRUN_CHECK_OVERHEAD | |
1572 | - GC_STRING_EXTRA | |
91f2d272 | 1573 | - offsetof (struct sblock, data) |
03a660a6 PE |
1574 | - SDATA_DATA_OFFSET) |
1575 | & ~(sizeof (EMACS_INT) - 1))); | |
c9d624c6 | 1576 | |
2e471eb5 | 1577 | /* Initialize string allocation. Called from init_alloc_once. */ |
d457598b | 1578 | |
d3d47262 | 1579 | static void |
971de7fb | 1580 | init_strings (void) |
7146af97 | 1581 | { |
4d774b0f JB |
1582 | empty_unibyte_string = make_pure_string ("", 0, 0, 0); |
1583 | empty_multibyte_string = make_pure_string ("", 0, 0, 1); | |
7146af97 JB |
1584 | } |
1585 | ||
2e471eb5 | 1586 | |
361b097f GM |
1587 | #ifdef GC_CHECK_STRING_BYTES |
1588 | ||
361b097f GM |
1589 | static int check_string_bytes_count; |
1590 | ||
e499d0ee DA |
1591 | /* Like STRING_BYTES, but with debugging check. Can be |
1592 | called during GC, so pay attention to the mark bit. */ | |
676a7251 | 1593 | |
d311d28c | 1594 | ptrdiff_t |
14162469 | 1595 | string_bytes (struct Lisp_String *s) |
676a7251 | 1596 | { |
d311d28c | 1597 | ptrdiff_t nbytes = |
14162469 EZ |
1598 | (s->size_byte < 0 ? s->size & ~ARRAY_MARK_FLAG : s->size_byte); |
1599 | ||
676a7251 GM |
1600 | if (!PURE_POINTER_P (s) |
1601 | && s->data | |
1602 | && nbytes != SDATA_NBYTES (SDATA_OF_STRING (s))) | |
1088b922 | 1603 | emacs_abort (); |
676a7251 GM |
1604 | return nbytes; |
1605 | } | |
177c0ea7 | 1606 | |
2c5bd608 | 1607 | /* Check validity of Lisp strings' string_bytes member in B. */ |
676a7251 | 1608 | |
d3d47262 | 1609 | static void |
d0f4e1f5 | 1610 | check_sblock (struct sblock *b) |
361b097f | 1611 | { |
fbe9e0b9 | 1612 | sdata *from, *end, *from_end; |
177c0ea7 | 1613 | |
676a7251 | 1614 | end = b->next_free; |
177c0ea7 | 1615 | |
91f2d272 | 1616 | for (from = b->data; from < end; from = from_end) |
361b097f | 1617 | { |
676a7251 GM |
1618 | /* Compute the next FROM here because copying below may |
1619 | overwrite data we need to compute it. */ | |
d311d28c | 1620 | ptrdiff_t nbytes; |
177c0ea7 | 1621 | |
676a7251 | 1622 | /* Check that the string size recorded in the string is the |
ee28be33 | 1623 | same as the one recorded in the sdata structure. */ |
e499d0ee DA |
1624 | nbytes = SDATA_SIZE (from->string ? string_bytes (from->string) |
1625 | : SDATA_NBYTES (from)); | |
fbe9e0b9 | 1626 | from_end = (sdata *) ((char *) from + nbytes + GC_STRING_EXTRA); |
676a7251 GM |
1627 | } |
1628 | } | |
361b097f | 1629 | |
676a7251 GM |
1630 | |
1631 | /* Check validity of Lisp strings' string_bytes member. ALL_P | |
fce31d69 | 1632 | means check all strings, otherwise check only most |
676a7251 GM |
1633 | recently allocated strings. Used for hunting a bug. */ |
1634 | ||
d3d47262 | 1635 | static void |
fce31d69 | 1636 | check_string_bytes (bool all_p) |
676a7251 GM |
1637 | { |
1638 | if (all_p) | |
1639 | { | |
1640 | struct sblock *b; | |
1641 | ||
1642 | for (b = large_sblocks; b; b = b->next) | |
1643 | { | |
91f2d272 | 1644 | struct Lisp_String *s = b->data[0].string; |
676a7251 | 1645 | if (s) |
e499d0ee | 1646 | string_bytes (s); |
361b097f | 1647 | } |
177c0ea7 | 1648 | |
676a7251 GM |
1649 | for (b = oldest_sblock; b; b = b->next) |
1650 | check_sblock (b); | |
361b097f | 1651 | } |
296094c3 | 1652 | else if (current_sblock) |
676a7251 | 1653 | check_sblock (current_sblock); |
361b097f GM |
1654 | } |
1655 | ||
e499d0ee DA |
1656 | #else /* not GC_CHECK_STRING_BYTES */ |
1657 | ||
1658 | #define check_string_bytes(all) ((void) 0) | |
1659 | ||
361b097f GM |
1660 | #endif /* GC_CHECK_STRING_BYTES */ |
1661 | ||
212f33f1 KS |
1662 | #ifdef GC_CHECK_STRING_FREE_LIST |
1663 | ||
bdbed949 KS |
1664 | /* Walk through the string free list looking for bogus next pointers. |
1665 | This may catch buffer overrun from a previous string. */ | |
1666 | ||
212f33f1 | 1667 | static void |
d0f4e1f5 | 1668 | check_string_free_list (void) |
212f33f1 KS |
1669 | { |
1670 | struct Lisp_String *s; | |
1671 | ||
1672 | /* Pop a Lisp_String off the free-list. */ | |
1673 | s = string_free_list; | |
1674 | while (s != NULL) | |
1675 | { | |
d01a7826 | 1676 | if ((uintptr_t) s < 1024) |
1088b922 | 1677 | emacs_abort (); |
212f33f1 KS |
1678 | s = NEXT_FREE_LISP_STRING (s); |
1679 | } | |
1680 | } | |
1681 | #else | |
1682 | #define check_string_free_list() | |
1683 | #endif | |
361b097f | 1684 | |
2e471eb5 GM |
1685 | /* Return a new Lisp_String. */ |
1686 | ||
1687 | static struct Lisp_String * | |
971de7fb | 1688 | allocate_string (void) |
7146af97 | 1689 | { |
2e471eb5 | 1690 | struct Lisp_String *s; |
7146af97 | 1691 | |
dafc79fa | 1692 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 1693 | |
2e471eb5 GM |
1694 | /* If the free-list is empty, allocate a new string_block, and |
1695 | add all the Lisp_Strings in it to the free-list. */ | |
1696 | if (string_free_list == NULL) | |
7146af97 | 1697 | { |
38182d90 | 1698 | struct string_block *b = lisp_malloc (sizeof *b, MEM_TYPE_STRING); |
2e471eb5 GM |
1699 | int i; |
1700 | ||
2e471eb5 GM |
1701 | b->next = string_blocks; |
1702 | string_blocks = b; | |
2e471eb5 | 1703 | |
19bcad1f | 1704 | for (i = STRING_BLOCK_SIZE - 1; i >= 0; --i) |
7146af97 | 1705 | { |
2e471eb5 | 1706 | s = b->strings + i; |
3fe6dd74 DA |
1707 | /* Every string on a free list should have NULL data pointer. */ |
1708 | s->data = NULL; | |
2e471eb5 GM |
1709 | NEXT_FREE_LISP_STRING (s) = string_free_list; |
1710 | string_free_list = s; | |
7146af97 | 1711 | } |
2e471eb5 | 1712 | |
19bcad1f | 1713 | total_free_strings += STRING_BLOCK_SIZE; |
7146af97 | 1714 | } |
c0f51373 | 1715 | |
bdbed949 | 1716 | check_string_free_list (); |
212f33f1 | 1717 | |
2e471eb5 GM |
1718 | /* Pop a Lisp_String off the free-list. */ |
1719 | s = string_free_list; | |
1720 | string_free_list = NEXT_FREE_LISP_STRING (s); | |
c0f51373 | 1721 | |
dafc79fa | 1722 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 1723 | |
2e471eb5 GM |
1724 | --total_free_strings; |
1725 | ++total_strings; | |
1726 | ++strings_consed; | |
1727 | consing_since_gc += sizeof *s; | |
c0f51373 | 1728 | |
361b097f | 1729 | #ifdef GC_CHECK_STRING_BYTES |
e39a993c | 1730 | if (!noninteractive) |
361b097f | 1731 | { |
676a7251 GM |
1732 | if (++check_string_bytes_count == 200) |
1733 | { | |
1734 | check_string_bytes_count = 0; | |
1735 | check_string_bytes (1); | |
1736 | } | |
1737 | else | |
1738 | check_string_bytes (0); | |
361b097f | 1739 | } |
676a7251 | 1740 | #endif /* GC_CHECK_STRING_BYTES */ |
361b097f | 1741 | |
2e471eb5 | 1742 | return s; |
c0f51373 | 1743 | } |
7146af97 | 1744 | |
7146af97 | 1745 | |
2e471eb5 GM |
1746 | /* Set up Lisp_String S for holding NCHARS characters, NBYTES bytes, |
1747 | plus a NUL byte at the end. Allocate an sdata structure for S, and | |
1748 | set S->data to its `u.data' member. Store a NUL byte at the end of | |
1749 | S->data. Set S->size to NCHARS and S->size_byte to NBYTES. Free | |
1750 | S->data if it was initially non-null. */ | |
7146af97 | 1751 | |
2e471eb5 | 1752 | void |
413d18e7 EZ |
1753 | allocate_string_data (struct Lisp_String *s, |
1754 | EMACS_INT nchars, EMACS_INT nbytes) | |
7146af97 | 1755 | { |
fbe9e0b9 | 1756 | sdata *data, *old_data; |
2e471eb5 | 1757 | struct sblock *b; |
b7ffe040 | 1758 | ptrdiff_t needed, old_nbytes; |
7146af97 | 1759 | |
c9d624c6 PE |
1760 | if (STRING_BYTES_MAX < nbytes) |
1761 | string_overflow (); | |
1762 | ||
2e471eb5 GM |
1763 | /* Determine the number of bytes needed to store NBYTES bytes |
1764 | of string data. */ | |
1765 | needed = SDATA_SIZE (nbytes); | |
b7ffe040 DA |
1766 | if (s->data) |
1767 | { | |
1768 | old_data = SDATA_OF_STRING (s); | |
e499d0ee | 1769 | old_nbytes = STRING_BYTES (s); |
b7ffe040 DA |
1770 | } |
1771 | else | |
1772 | old_data = NULL; | |
e2984df0 | 1773 | |
dafc79fa | 1774 | MALLOC_BLOCK_INPUT; |
7146af97 | 1775 | |
2e471eb5 GM |
1776 | if (nbytes > LARGE_STRING_BYTES) |
1777 | { | |
91f2d272 | 1778 | size_t size = offsetof (struct sblock, data) + needed; |
2e471eb5 GM |
1779 | |
1780 | #ifdef DOUG_LEA_MALLOC | |
f20b8315 DC |
1781 | if (!mmap_lisp_allowed_p ()) |
1782 | mallopt (M_MMAP_MAX, 0); | |
2e471eb5 GM |
1783 | #endif |
1784 | ||
38182d90 | 1785 | b = lisp_malloc (size + GC_STRING_EXTRA, MEM_TYPE_NON_LISP); |
177c0ea7 | 1786 | |
2e471eb5 | 1787 | #ifdef DOUG_LEA_MALLOC |
f20b8315 DC |
1788 | if (!mmap_lisp_allowed_p ()) |
1789 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); | |
2e471eb5 | 1790 | #endif |
177c0ea7 | 1791 | |
91f2d272 PE |
1792 | b->next_free = b->data; |
1793 | b->data[0].string = NULL; | |
2e471eb5 GM |
1794 | b->next = large_sblocks; |
1795 | large_sblocks = b; | |
1796 | } | |
1797 | else if (current_sblock == NULL | |
1798 | || (((char *) current_sblock + SBLOCK_SIZE | |
1799 | - (char *) current_sblock->next_free) | |
212f33f1 | 1800 | < (needed + GC_STRING_EXTRA))) |
2e471eb5 GM |
1801 | { |
1802 | /* Not enough room in the current sblock. */ | |
38182d90 | 1803 | b = lisp_malloc (SBLOCK_SIZE, MEM_TYPE_NON_LISP); |
91f2d272 PE |
1804 | b->next_free = b->data; |
1805 | b->data[0].string = NULL; | |
2e471eb5 GM |
1806 | b->next = NULL; |
1807 | ||
1808 | if (current_sblock) | |
1809 | current_sblock->next = b; | |
1810 | else | |
1811 | oldest_sblock = b; | |
1812 | current_sblock = b; | |
1813 | } | |
1814 | else | |
1815 | b = current_sblock; | |
5c5fecb3 | 1816 | |
2e471eb5 | 1817 | data = b->next_free; |
fbe9e0b9 | 1818 | b->next_free = (sdata *) ((char *) data + needed + GC_STRING_EXTRA); |
a0b08700 | 1819 | |
dafc79fa | 1820 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 1821 | |
2e471eb5 | 1822 | data->string = s; |
31d929e5 GM |
1823 | s->data = SDATA_DATA (data); |
1824 | #ifdef GC_CHECK_STRING_BYTES | |
1825 | SDATA_NBYTES (data) = nbytes; | |
1826 | #endif | |
2e471eb5 GM |
1827 | s->size = nchars; |
1828 | s->size_byte = nbytes; | |
1829 | s->data[nbytes] = '\0'; | |
212f33f1 | 1830 | #ifdef GC_CHECK_STRING_OVERRUN |
000098c1 PE |
1831 | memcpy ((char *) data + needed, string_overrun_cookie, |
1832 | GC_STRING_OVERRUN_COOKIE_SIZE); | |
212f33f1 | 1833 | #endif |
b7ffe040 DA |
1834 | |
1835 | /* Note that Faset may call to this function when S has already data | |
1836 | assigned. In this case, mark data as free by setting it's string | |
1837 | back-pointer to null, and record the size of the data in it. */ | |
1838 | if (old_data) | |
1839 | { | |
1840 | SDATA_NBYTES (old_data) = old_nbytes; | |
1841 | old_data->string = NULL; | |
1842 | } | |
1843 | ||
2e471eb5 GM |
1844 | consing_since_gc += needed; |
1845 | } | |
1846 | ||
1847 | ||
1848 | /* Sweep and compact strings. */ | |
1849 | ||
b029599f | 1850 | NO_INLINE /* For better stack traces */ |
2e471eb5 | 1851 | static void |
971de7fb | 1852 | sweep_strings (void) |
2e471eb5 GM |
1853 | { |
1854 | struct string_block *b, *next; | |
1855 | struct string_block *live_blocks = NULL; | |
177c0ea7 | 1856 | |
2e471eb5 GM |
1857 | string_free_list = NULL; |
1858 | total_strings = total_free_strings = 0; | |
3ab6e069 | 1859 | total_string_bytes = 0; |
2e471eb5 GM |
1860 | |
1861 | /* Scan strings_blocks, free Lisp_Strings that aren't marked. */ | |
1862 | for (b = string_blocks; b; b = next) | |
1863 | { | |
1864 | int i, nfree = 0; | |
1865 | struct Lisp_String *free_list_before = string_free_list; | |
1866 | ||
1867 | next = b->next; | |
1868 | ||
19bcad1f | 1869 | for (i = 0; i < STRING_BLOCK_SIZE; ++i) |
2e471eb5 GM |
1870 | { |
1871 | struct Lisp_String *s = b->strings + i; | |
1872 | ||
1873 | if (s->data) | |
1874 | { | |
1875 | /* String was not on free-list before. */ | |
1876 | if (STRING_MARKED_P (s)) | |
1877 | { | |
1878 | /* String is live; unmark it and its intervals. */ | |
1879 | UNMARK_STRING (s); | |
177c0ea7 | 1880 | |
8707c1e5 DA |
1881 | /* Do not use string_(set|get)_intervals here. */ |
1882 | s->intervals = balance_intervals (s->intervals); | |
2e471eb5 GM |
1883 | |
1884 | ++total_strings; | |
3ab6e069 | 1885 | total_string_bytes += STRING_BYTES (s); |
2e471eb5 GM |
1886 | } |
1887 | else | |
1888 | { | |
1889 | /* String is dead. Put it on the free-list. */ | |
fbe9e0b9 | 1890 | sdata *data = SDATA_OF_STRING (s); |
2e471eb5 GM |
1891 | |
1892 | /* Save the size of S in its sdata so that we know | |
1893 | how large that is. Reset the sdata's string | |
1894 | back-pointer so that we know it's free. */ | |
31d929e5 | 1895 | #ifdef GC_CHECK_STRING_BYTES |
e499d0ee | 1896 | if (string_bytes (s) != SDATA_NBYTES (data)) |
1088b922 | 1897 | emacs_abort (); |
31d929e5 | 1898 | #else |
fbe9e0b9 | 1899 | data->n.nbytes = STRING_BYTES (s); |
31d929e5 | 1900 | #endif |
2e471eb5 GM |
1901 | data->string = NULL; |
1902 | ||
1903 | /* Reset the strings's `data' member so that we | |
1904 | know it's free. */ | |
1905 | s->data = NULL; | |
1906 | ||
1907 | /* Put the string on the free-list. */ | |
1908 | NEXT_FREE_LISP_STRING (s) = string_free_list; | |
1909 | string_free_list = s; | |
1910 | ++nfree; | |
1911 | } | |
1912 | } | |
1913 | else | |
1914 | { | |
1915 | /* S was on the free-list before. Put it there again. */ | |
1916 | NEXT_FREE_LISP_STRING (s) = string_free_list; | |
1917 | string_free_list = s; | |
1918 | ++nfree; | |
1919 | } | |
1920 | } | |
1921 | ||
34400008 | 1922 | /* Free blocks that contain free Lisp_Strings only, except |
2e471eb5 | 1923 | the first two of them. */ |
19bcad1f SM |
1924 | if (nfree == STRING_BLOCK_SIZE |
1925 | && total_free_strings > STRING_BLOCK_SIZE) | |
2e471eb5 GM |
1926 | { |
1927 | lisp_free (b); | |
2e471eb5 GM |
1928 | string_free_list = free_list_before; |
1929 | } | |
1930 | else | |
1931 | { | |
1932 | total_free_strings += nfree; | |
1933 | b->next = live_blocks; | |
1934 | live_blocks = b; | |
1935 | } | |
1936 | } | |
1937 | ||
bdbed949 | 1938 | check_string_free_list (); |
212f33f1 | 1939 | |
2e471eb5 GM |
1940 | string_blocks = live_blocks; |
1941 | free_large_strings (); | |
1942 | compact_small_strings (); | |
212f33f1 | 1943 | |
bdbed949 | 1944 | check_string_free_list (); |
2e471eb5 GM |
1945 | } |
1946 | ||
1947 | ||
1948 | /* Free dead large strings. */ | |
1949 | ||
1950 | static void | |
971de7fb | 1951 | free_large_strings (void) |
2e471eb5 GM |
1952 | { |
1953 | struct sblock *b, *next; | |
1954 | struct sblock *live_blocks = NULL; | |
177c0ea7 | 1955 | |
2e471eb5 GM |
1956 | for (b = large_sblocks; b; b = next) |
1957 | { | |
1958 | next = b->next; | |
1959 | ||
91f2d272 | 1960 | if (b->data[0].string == NULL) |
2e471eb5 GM |
1961 | lisp_free (b); |
1962 | else | |
1963 | { | |
1964 | b->next = live_blocks; | |
1965 | live_blocks = b; | |
1966 | } | |
1967 | } | |
1968 | ||
1969 | large_sblocks = live_blocks; | |
1970 | } | |
1971 | ||
1972 | ||
1973 | /* Compact data of small strings. Free sblocks that don't contain | |
1974 | data of live strings after compaction. */ | |
1975 | ||
1976 | static void | |
971de7fb | 1977 | compact_small_strings (void) |
2e471eb5 GM |
1978 | { |
1979 | struct sblock *b, *tb, *next; | |
fbe9e0b9 PE |
1980 | sdata *from, *to, *end, *tb_end; |
1981 | sdata *to_end, *from_end; | |
2e471eb5 GM |
1982 | |
1983 | /* TB is the sblock we copy to, TO is the sdata within TB we copy | |
1984 | to, and TB_END is the end of TB. */ | |
1985 | tb = oldest_sblock; | |
fbe9e0b9 | 1986 | tb_end = (sdata *) ((char *) tb + SBLOCK_SIZE); |
91f2d272 | 1987 | to = tb->data; |
2e471eb5 GM |
1988 | |
1989 | /* Step through the blocks from the oldest to the youngest. We | |
1990 | expect that old blocks will stabilize over time, so that less | |
1991 | copying will happen this way. */ | |
1992 | for (b = oldest_sblock; b; b = b->next) | |
1993 | { | |
1994 | end = b->next_free; | |
a54e2c05 | 1995 | eassert ((char *) end <= (char *) b + SBLOCK_SIZE); |
177c0ea7 | 1996 | |
91f2d272 | 1997 | for (from = b->data; from < end; from = from_end) |
2e471eb5 GM |
1998 | { |
1999 | /* Compute the next FROM here because copying below may | |
2000 | overwrite data we need to compute it. */ | |
d311d28c | 2001 | ptrdiff_t nbytes; |
e499d0ee | 2002 | struct Lisp_String *s = from->string; |
2e471eb5 | 2003 | |
31d929e5 GM |
2004 | #ifdef GC_CHECK_STRING_BYTES |
2005 | /* Check that the string size recorded in the string is the | |
b09cca6a | 2006 | same as the one recorded in the sdata structure. */ |
e499d0ee | 2007 | if (s && string_bytes (s) != SDATA_NBYTES (from)) |
1088b922 | 2008 | emacs_abort (); |
31d929e5 | 2009 | #endif /* GC_CHECK_STRING_BYTES */ |
177c0ea7 | 2010 | |
e499d0ee DA |
2011 | nbytes = s ? STRING_BYTES (s) : SDATA_NBYTES (from); |
2012 | eassert (nbytes <= LARGE_STRING_BYTES); | |
212f33f1 | 2013 | |
2e471eb5 | 2014 | nbytes = SDATA_SIZE (nbytes); |
fbe9e0b9 | 2015 | from_end = (sdata *) ((char *) from + nbytes + GC_STRING_EXTRA); |
212f33f1 KS |
2016 | |
2017 | #ifdef GC_CHECK_STRING_OVERRUN | |
72af86bd AS |
2018 | if (memcmp (string_overrun_cookie, |
2019 | (char *) from_end - GC_STRING_OVERRUN_COOKIE_SIZE, | |
2020 | GC_STRING_OVERRUN_COOKIE_SIZE)) | |
1088b922 | 2021 | emacs_abort (); |
212f33f1 | 2022 | #endif |
177c0ea7 | 2023 | |
e499d0ee DA |
2024 | /* Non-NULL S means it's alive. Copy its data. */ |
2025 | if (s) | |
2e471eb5 GM |
2026 | { |
2027 | /* If TB is full, proceed with the next sblock. */ | |
fbe9e0b9 | 2028 | to_end = (sdata *) ((char *) to + nbytes + GC_STRING_EXTRA); |
2e471eb5 GM |
2029 | if (to_end > tb_end) |
2030 | { | |
2031 | tb->next_free = to; | |
2032 | tb = tb->next; | |
fbe9e0b9 | 2033 | tb_end = (sdata *) ((char *) tb + SBLOCK_SIZE); |
91f2d272 | 2034 | to = tb->data; |
fbe9e0b9 | 2035 | to_end = (sdata *) ((char *) to + nbytes + GC_STRING_EXTRA); |
2e471eb5 | 2036 | } |
177c0ea7 | 2037 | |
2e471eb5 GM |
2038 | /* Copy, and update the string's `data' pointer. */ |
2039 | if (from != to) | |
2040 | { | |
a54e2c05 | 2041 | eassert (tb != b || to < from); |
72af86bd | 2042 | memmove (to, from, nbytes + GC_STRING_EXTRA); |
31d929e5 | 2043 | to->string->data = SDATA_DATA (to); |
2e471eb5 GM |
2044 | } |
2045 | ||
2046 | /* Advance past the sdata we copied to. */ | |
2047 | to = to_end; | |
2048 | } | |
2049 | } | |
2050 | } | |
2051 | ||
2052 | /* The rest of the sblocks following TB don't contain live data, so | |
2053 | we can free them. */ | |
2054 | for (b = tb->next; b; b = next) | |
2055 | { | |
2056 | next = b->next; | |
2057 | lisp_free (b); | |
2058 | } | |
2059 | ||
2060 | tb->next_free = to; | |
2061 | tb->next = NULL; | |
2062 | current_sblock = tb; | |
2063 | } | |
2064 | ||
cb93f9be PE |
2065 | void |
2066 | string_overflow (void) | |
2067 | { | |
2068 | error ("Maximum string size exceeded"); | |
2069 | } | |
2e471eb5 | 2070 | |
a7ca3326 | 2071 | DEFUN ("make-string", Fmake_string, Smake_string, 2, 2, 0, |
69623621 RS |
2072 | doc: /* Return a newly created string of length LENGTH, with INIT in each element. |
2073 | LENGTH must be an integer. | |
2074 | INIT must be an integer that represents a character. */) | |
5842a27b | 2075 | (Lisp_Object length, Lisp_Object init) |
2e471eb5 GM |
2076 | { |
2077 | register Lisp_Object val; | |
14162469 EZ |
2078 | int c; |
2079 | EMACS_INT nbytes; | |
2e471eb5 | 2080 | |
b7826503 | 2081 | CHECK_NATNUM (length); |
2bccce07 | 2082 | CHECK_CHARACTER (init); |
2e471eb5 | 2083 | |
2bccce07 | 2084 | c = XFASTINT (init); |
830ff83b | 2085 | if (ASCII_CHAR_P (c)) |
2e471eb5 GM |
2086 | { |
2087 | nbytes = XINT (length); | |
2088 | val = make_uninit_string (nbytes); | |
3c439e0a DA |
2089 | memset (SDATA (val), c, nbytes); |
2090 | SDATA (val)[nbytes] = 0; | |
2e471eb5 GM |
2091 | } |
2092 | else | |
2093 | { | |
d942b71c | 2094 | unsigned char str[MAX_MULTIBYTE_LENGTH]; |
cc593f54 | 2095 | ptrdiff_t len = CHAR_STRING (c, str); |
14162469 | 2096 | EMACS_INT string_len = XINT (length); |
3c439e0a | 2097 | unsigned char *p, *beg, *end; |
2e471eb5 | 2098 | |
d1f3d2af | 2099 | if (string_len > STRING_BYTES_MAX / len) |
cb93f9be | 2100 | string_overflow (); |
14162469 EZ |
2101 | nbytes = len * string_len; |
2102 | val = make_uninit_multibyte_string (string_len, nbytes); | |
3c439e0a | 2103 | for (beg = SDATA (val), p = beg, end = beg + nbytes; p < end; p += len) |
2e471eb5 | 2104 | { |
3c439e0a DA |
2105 | /* First time we just copy `str' to the data of `val'. */ |
2106 | if (p == beg) | |
2107 | memcpy (p, str, len); | |
2108 | else | |
2109 | { | |
2110 | /* Next time we copy largest possible chunk from | |
2111 | initialized to uninitialized part of `val'. */ | |
2112 | len = min (p - beg, end - p); | |
2113 | memcpy (p, beg, len); | |
2114 | } | |
2e471eb5 | 2115 | } |
3c439e0a | 2116 | *p = 0; |
2e471eb5 | 2117 | } |
177c0ea7 | 2118 | |
2e471eb5 GM |
2119 | return val; |
2120 | } | |
2121 | ||
2cf00efc PE |
2122 | /* Fill A with 1 bits if INIT is non-nil, and with 0 bits otherwise. |
2123 | Return A. */ | |
3e0b94e7 | 2124 | |
2cf00efc | 2125 | Lisp_Object |
df5b4930 PE |
2126 | bool_vector_fill (Lisp_Object a, Lisp_Object init) |
2127 | { | |
2128 | EMACS_INT nbits = bool_vector_size (a); | |
2129 | if (0 < nbits) | |
3e0b94e7 | 2130 | { |
df5b4930 PE |
2131 | unsigned char *data = bool_vector_uchar_data (a); |
2132 | int pattern = NILP (init) ? 0 : (1 << BOOL_VECTOR_BITS_PER_CHAR) - 1; | |
2cf00efc | 2133 | ptrdiff_t nbytes = bool_vector_bytes (nbits); |
6ab1b16c | 2134 | int last_mask = ~ (~0u << ((nbits - 1) % BOOL_VECTOR_BITS_PER_CHAR + 1)); |
df5b4930 PE |
2135 | memset (data, pattern, nbytes - 1); |
2136 | data[nbytes - 1] = pattern & last_mask; | |
3e0b94e7 | 2137 | } |
2cf00efc | 2138 | return a; |
3e0b94e7 | 2139 | } |
2e471eb5 | 2140 | |
2cf00efc PE |
2141 | /* Return a newly allocated, uninitialized bool vector of size NBITS. */ |
2142 | ||
2143 | Lisp_Object | |
2144 | make_uninit_bool_vector (EMACS_INT nbits) | |
2e471eb5 | 2145 | { |
df5b4930 | 2146 | Lisp_Object val; |
75360f19 | 2147 | EMACS_INT words = bool_vector_words (nbits); |
87d86601 PE |
2148 | EMACS_INT word_bytes = words * sizeof (bits_word); |
2149 | EMACS_INT needed_elements = ((bool_header_size - header_size + word_bytes | |
2150 | + word_size - 1) | |
2151 | / word_size); | |
2152 | struct Lisp_Bool_Vector *p | |
2153 | = (struct Lisp_Bool_Vector *) allocate_vector (needed_elements); | |
3e0b94e7 | 2154 | XSETVECTOR (val, p); |
914adc42 | 2155 | XSETPVECTYPESIZE (XVECTOR (val), PVEC_BOOL_VECTOR, 0, 0); |
2cf00efc | 2156 | p->size = nbits; |
2e471eb5 | 2157 | |
75360f19 PE |
2158 | /* Clear padding at the end. */ |
2159 | if (words) | |
2160 | p->data[words - 1] = 0; | |
3e0b94e7 | 2161 | |
2e471eb5 GM |
2162 | return val; |
2163 | } | |
2164 | ||
2cf00efc PE |
2165 | DEFUN ("make-bool-vector", Fmake_bool_vector, Smake_bool_vector, 2, 2, 0, |
2166 | doc: /* Return a new bool-vector of length LENGTH, using INIT for each element. | |
2167 | LENGTH must be a number. INIT matters only in whether it is t or nil. */) | |
2168 | (Lisp_Object length, Lisp_Object init) | |
2169 | { | |
2170 | Lisp_Object val; | |
2171 | ||
2172 | CHECK_NATNUM (length); | |
2173 | val = make_uninit_bool_vector (XFASTINT (length)); | |
2174 | return bool_vector_fill (val, init); | |
2175 | } | |
2176 | ||
2bcf0551 DA |
2177 | DEFUN ("bool-vector", Fbool_vector, Sbool_vector, 0, MANY, 0, |
2178 | doc: /* Return a new bool-vector with specified arguments as elements. | |
2179 | Any number of arguments, even zero arguments, are allowed. | |
2bcf0551 DA |
2180 | usage: (bool-vector &rest OBJECTS) */) |
2181 | (ptrdiff_t nargs, Lisp_Object *args) | |
2182 | { | |
2183 | ptrdiff_t i; | |
2184 | Lisp_Object vector; | |
2185 | ||
2bcf0551 DA |
2186 | vector = make_uninit_bool_vector (nargs); |
2187 | for (i = 0; i < nargs; i++) | |
2188 | bool_vector_set (vector, i, !NILP (args[i])); | |
2189 | ||
2190 | return vector; | |
2191 | } | |
2e471eb5 GM |
2192 | |
2193 | /* Make a string from NBYTES bytes at CONTENTS, and compute the number | |
2194 | of characters from the contents. This string may be unibyte or | |
2195 | multibyte, depending on the contents. */ | |
2196 | ||
2197 | Lisp_Object | |
d311d28c | 2198 | make_string (const char *contents, ptrdiff_t nbytes) |
2e471eb5 GM |
2199 | { |
2200 | register Lisp_Object val; | |
d311d28c | 2201 | ptrdiff_t nchars, multibyte_nbytes; |
9eac9d59 | 2202 | |
90256841 PE |
2203 | parse_str_as_multibyte ((const unsigned char *) contents, nbytes, |
2204 | &nchars, &multibyte_nbytes); | |
9eac9d59 KH |
2205 | if (nbytes == nchars || nbytes != multibyte_nbytes) |
2206 | /* CONTENTS contains no multibyte sequences or contains an invalid | |
2207 | multibyte sequence. We must make unibyte string. */ | |
495a6df3 KH |
2208 | val = make_unibyte_string (contents, nbytes); |
2209 | else | |
2210 | val = make_multibyte_string (contents, nchars, nbytes); | |
2e471eb5 GM |
2211 | return val; |
2212 | } | |
2213 | ||
2214 | ||
2215 | /* Make an unibyte string from LENGTH bytes at CONTENTS. */ | |
2216 | ||
2217 | Lisp_Object | |
d311d28c | 2218 | make_unibyte_string (const char *contents, ptrdiff_t length) |
2e471eb5 GM |
2219 | { |
2220 | register Lisp_Object val; | |
2221 | val = make_uninit_string (length); | |
72af86bd | 2222 | memcpy (SDATA (val), contents, length); |
2e471eb5 GM |
2223 | return val; |
2224 | } | |
2225 | ||
2226 | ||
2227 | /* Make a multibyte string from NCHARS characters occupying NBYTES | |
2228 | bytes at CONTENTS. */ | |
2229 | ||
2230 | Lisp_Object | |
14162469 | 2231 | make_multibyte_string (const char *contents, |
d311d28c | 2232 | ptrdiff_t nchars, ptrdiff_t nbytes) |
2e471eb5 GM |
2233 | { |
2234 | register Lisp_Object val; | |
2235 | val = make_uninit_multibyte_string (nchars, nbytes); | |
72af86bd | 2236 | memcpy (SDATA (val), contents, nbytes); |
2e471eb5 GM |
2237 | return val; |
2238 | } | |
2239 | ||
2240 | ||
2241 | /* Make a string from NCHARS characters occupying NBYTES bytes at | |
2242 | CONTENTS. It is a multibyte string if NBYTES != NCHARS. */ | |
2243 | ||
2244 | Lisp_Object | |
14162469 | 2245 | make_string_from_bytes (const char *contents, |
d311d28c | 2246 | ptrdiff_t nchars, ptrdiff_t nbytes) |
2e471eb5 GM |
2247 | { |
2248 | register Lisp_Object val; | |
2249 | val = make_uninit_multibyte_string (nchars, nbytes); | |
72af86bd | 2250 | memcpy (SDATA (val), contents, nbytes); |
d5db4077 KR |
2251 | if (SBYTES (val) == SCHARS (val)) |
2252 | STRING_SET_UNIBYTE (val); | |
2e471eb5 GM |
2253 | return val; |
2254 | } | |
2255 | ||
2256 | ||
2257 | /* Make a string from NCHARS characters occupying NBYTES bytes at | |
2258 | CONTENTS. The argument MULTIBYTE controls whether to label the | |
229b28c4 KH |
2259 | string as multibyte. If NCHARS is negative, it counts the number of |
2260 | characters by itself. */ | |
2e471eb5 GM |
2261 | |
2262 | Lisp_Object | |
14162469 | 2263 | make_specified_string (const char *contents, |
fce31d69 | 2264 | ptrdiff_t nchars, ptrdiff_t nbytes, bool multibyte) |
2e471eb5 | 2265 | { |
fce31d69 | 2266 | Lisp_Object val; |
229b28c4 KH |
2267 | |
2268 | if (nchars < 0) | |
2269 | { | |
2270 | if (multibyte) | |
90256841 PE |
2271 | nchars = multibyte_chars_in_text ((const unsigned char *) contents, |
2272 | nbytes); | |
229b28c4 KH |
2273 | else |
2274 | nchars = nbytes; | |
2275 | } | |
2e471eb5 | 2276 | val = make_uninit_multibyte_string (nchars, nbytes); |
72af86bd | 2277 | memcpy (SDATA (val), contents, nbytes); |
2e471eb5 | 2278 | if (!multibyte) |
d5db4077 | 2279 | STRING_SET_UNIBYTE (val); |
2e471eb5 GM |
2280 | return val; |
2281 | } | |
2282 | ||
2283 | ||
2e471eb5 GM |
2284 | /* Return an unibyte Lisp_String set up to hold LENGTH characters |
2285 | occupying LENGTH bytes. */ | |
2286 | ||
2287 | Lisp_Object | |
413d18e7 | 2288 | make_uninit_string (EMACS_INT length) |
2e471eb5 GM |
2289 | { |
2290 | Lisp_Object val; | |
4d774b0f JB |
2291 | |
2292 | if (!length) | |
2293 | return empty_unibyte_string; | |
2e471eb5 | 2294 | val = make_uninit_multibyte_string (length, length); |
d5db4077 | 2295 | STRING_SET_UNIBYTE (val); |
2e471eb5 GM |
2296 | return val; |
2297 | } | |
2298 | ||
2299 | ||
2300 | /* Return a multibyte Lisp_String set up to hold NCHARS characters | |
2301 | which occupy NBYTES bytes. */ | |
2302 | ||
2303 | Lisp_Object | |
413d18e7 | 2304 | make_uninit_multibyte_string (EMACS_INT nchars, EMACS_INT nbytes) |
2e471eb5 GM |
2305 | { |
2306 | Lisp_Object string; | |
2307 | struct Lisp_String *s; | |
2308 | ||
2309 | if (nchars < 0) | |
1088b922 | 2310 | emacs_abort (); |
4d774b0f JB |
2311 | if (!nbytes) |
2312 | return empty_multibyte_string; | |
2e471eb5 GM |
2313 | |
2314 | s = allocate_string (); | |
77c7bcb1 | 2315 | s->intervals = NULL; |
2e471eb5 GM |
2316 | allocate_string_data (s, nchars, nbytes); |
2317 | XSETSTRING (string, s); | |
2318 | string_chars_consed += nbytes; | |
2319 | return string; | |
2320 | } | |
2321 | ||
a8290ec3 DA |
2322 | /* Print arguments to BUF according to a FORMAT, then return |
2323 | a Lisp_String initialized with the data from BUF. */ | |
2324 | ||
2325 | Lisp_Object | |
2326 | make_formatted_string (char *buf, const char *format, ...) | |
2327 | { | |
2328 | va_list ap; | |
26bccfae | 2329 | int length; |
a8290ec3 DA |
2330 | |
2331 | va_start (ap, format); | |
2332 | length = vsprintf (buf, format, ap); | |
2333 | va_end (ap); | |
2334 | return make_string (buf, length); | |
2335 | } | |
2e471eb5 GM |
2336 | |
2337 | \f | |
2338 | /*********************************************************************** | |
2339 | Float Allocation | |
2340 | ***********************************************************************/ | |
2341 | ||
2e471eb5 GM |
2342 | /* We store float cells inside of float_blocks, allocating a new |
2343 | float_block with malloc whenever necessary. Float cells reclaimed | |
2344 | by GC are put on a free list to be reallocated before allocating | |
ab6780cd | 2345 | any new float cells from the latest float_block. */ |
2e471eb5 | 2346 | |
6b61353c KH |
2347 | #define FLOAT_BLOCK_SIZE \ |
2348 | (((BLOCK_BYTES - sizeof (struct float_block *) \ | |
2349 | /* The compiler might add padding at the end. */ \ | |
9c23779a | 2350 | - (sizeof (struct Lisp_Float) - sizeof (bits_word))) * CHAR_BIT) \ |
ab6780cd SM |
2351 | / (sizeof (struct Lisp_Float) * CHAR_BIT + 1)) |
2352 | ||
2353 | #define GETMARKBIT(block,n) \ | |
9c23779a PE |
2354 | (((block)->gcmarkbits[(n) / BITS_PER_BITS_WORD] \ |
2355 | >> ((n) % BITS_PER_BITS_WORD)) \ | |
ab6780cd SM |
2356 | & 1) |
2357 | ||
2358 | #define SETMARKBIT(block,n) \ | |
9c23779a PE |
2359 | ((block)->gcmarkbits[(n) / BITS_PER_BITS_WORD] \ |
2360 | |= (bits_word) 1 << ((n) % BITS_PER_BITS_WORD)) | |
ab6780cd SM |
2361 | |
2362 | #define UNSETMARKBIT(block,n) \ | |
9c23779a PE |
2363 | ((block)->gcmarkbits[(n) / BITS_PER_BITS_WORD] \ |
2364 | &= ~((bits_word) 1 << ((n) % BITS_PER_BITS_WORD))) | |
ab6780cd SM |
2365 | |
2366 | #define FLOAT_BLOCK(fptr) \ | |
d01a7826 | 2367 | ((struct float_block *) (((uintptr_t) (fptr)) & ~(BLOCK_ALIGN - 1))) |
ab6780cd SM |
2368 | |
2369 | #define FLOAT_INDEX(fptr) \ | |
d01a7826 | 2370 | ((((uintptr_t) (fptr)) & (BLOCK_ALIGN - 1)) / sizeof (struct Lisp_Float)) |
2e471eb5 GM |
2371 | |
2372 | struct float_block | |
2373 | { | |
ab6780cd | 2374 | /* Place `floats' at the beginning, to ease up FLOAT_INDEX's job. */ |
2e471eb5 | 2375 | struct Lisp_Float floats[FLOAT_BLOCK_SIZE]; |
9c23779a | 2376 | bits_word gcmarkbits[1 + FLOAT_BLOCK_SIZE / BITS_PER_BITS_WORD]; |
ab6780cd | 2377 | struct float_block *next; |
2e471eb5 GM |
2378 | }; |
2379 | ||
ab6780cd SM |
2380 | #define FLOAT_MARKED_P(fptr) \ |
2381 | GETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr))) | |
2382 | ||
2383 | #define FLOAT_MARK(fptr) \ | |
2384 | SETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr))) | |
2385 | ||
2386 | #define FLOAT_UNMARK(fptr) \ | |
2387 | UNSETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr))) | |
2388 | ||
34400008 GM |
2389 | /* Current float_block. */ |
2390 | ||
244ed907 | 2391 | static struct float_block *float_block; |
34400008 GM |
2392 | |
2393 | /* Index of first unused Lisp_Float in the current float_block. */ | |
2394 | ||
fff62aa9 | 2395 | static int float_block_index = FLOAT_BLOCK_SIZE; |
2e471eb5 | 2396 | |
34400008 GM |
2397 | /* Free-list of Lisp_Floats. */ |
2398 | ||
244ed907 | 2399 | static struct Lisp_Float *float_free_list; |
2e471eb5 | 2400 | |
34400008 GM |
2401 | /* Return a new float object with value FLOAT_VALUE. */ |
2402 | ||
2e471eb5 | 2403 | Lisp_Object |
971de7fb | 2404 | make_float (double float_value) |
2e471eb5 GM |
2405 | { |
2406 | register Lisp_Object val; | |
2407 | ||
dafc79fa | 2408 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 2409 | |
2e471eb5 GM |
2410 | if (float_free_list) |
2411 | { | |
2412 | /* We use the data field for chaining the free list | |
2413 | so that we won't use the same field that has the mark bit. */ | |
2414 | XSETFLOAT (val, float_free_list); | |
28a099a4 | 2415 | float_free_list = float_free_list->u.chain; |
2e471eb5 GM |
2416 | } |
2417 | else | |
2418 | { | |
2419 | if (float_block_index == FLOAT_BLOCK_SIZE) | |
2420 | { | |
38182d90 PE |
2421 | struct float_block *new |
2422 | = lisp_align_malloc (sizeof *new, MEM_TYPE_FLOAT); | |
2e471eb5 | 2423 | new->next = float_block; |
72af86bd | 2424 | memset (new->gcmarkbits, 0, sizeof new->gcmarkbits); |
2e471eb5 GM |
2425 | float_block = new; |
2426 | float_block_index = 0; | |
3900d5de | 2427 | total_free_floats += FLOAT_BLOCK_SIZE; |
2e471eb5 | 2428 | } |
6b61353c KH |
2429 | XSETFLOAT (val, &float_block->floats[float_block_index]); |
2430 | float_block_index++; | |
2e471eb5 | 2431 | } |
177c0ea7 | 2432 | |
dafc79fa | 2433 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 2434 | |
f601cdf3 | 2435 | XFLOAT_INIT (val, float_value); |
6b61353c | 2436 | eassert (!FLOAT_MARKED_P (XFLOAT (val))); |
2e471eb5 GM |
2437 | consing_since_gc += sizeof (struct Lisp_Float); |
2438 | floats_consed++; | |
3900d5de | 2439 | total_free_floats--; |
2e471eb5 GM |
2440 | return val; |
2441 | } | |
2442 | ||
2e471eb5 GM |
2443 | |
2444 | \f | |
2445 | /*********************************************************************** | |
2446 | Cons Allocation | |
2447 | ***********************************************************************/ | |
2448 | ||
2449 | /* We store cons cells inside of cons_blocks, allocating a new | |
2450 | cons_block with malloc whenever necessary. Cons cells reclaimed by | |
2451 | GC are put on a free list to be reallocated before allocating | |
08b7c2cb | 2452 | any new cons cells from the latest cons_block. */ |
2e471eb5 | 2453 | |
a2821611 AS |
2454 | #define CONS_BLOCK_SIZE \ |
2455 | (((BLOCK_BYTES - sizeof (struct cons_block *) \ | |
2456 | /* The compiler might add padding at the end. */ \ | |
9c23779a | 2457 | - (sizeof (struct Lisp_Cons) - sizeof (bits_word))) * CHAR_BIT) \ |
08b7c2cb SM |
2458 | / (sizeof (struct Lisp_Cons) * CHAR_BIT + 1)) |
2459 | ||
2460 | #define CONS_BLOCK(fptr) \ | |
d01a7826 | 2461 | ((struct cons_block *) ((uintptr_t) (fptr) & ~(BLOCK_ALIGN - 1))) |
08b7c2cb SM |
2462 | |
2463 | #define CONS_INDEX(fptr) \ | |
d01a7826 | 2464 | (((uintptr_t) (fptr) & (BLOCK_ALIGN - 1)) / sizeof (struct Lisp_Cons)) |
2e471eb5 GM |
2465 | |
2466 | struct cons_block | |
2467 | { | |
08b7c2cb | 2468 | /* Place `conses' at the beginning, to ease up CONS_INDEX's job. */ |
2e471eb5 | 2469 | struct Lisp_Cons conses[CONS_BLOCK_SIZE]; |
9c23779a | 2470 | bits_word gcmarkbits[1 + CONS_BLOCK_SIZE / BITS_PER_BITS_WORD]; |
08b7c2cb | 2471 | struct cons_block *next; |
2e471eb5 GM |
2472 | }; |
2473 | ||
08b7c2cb SM |
2474 | #define CONS_MARKED_P(fptr) \ |
2475 | GETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr))) | |
2476 | ||
2477 | #define CONS_MARK(fptr) \ | |
2478 | SETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr))) | |
2479 | ||
2480 | #define CONS_UNMARK(fptr) \ | |
2481 | UNSETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr))) | |
2482 | ||
34400008 GM |
2483 | /* Current cons_block. */ |
2484 | ||
244ed907 | 2485 | static struct cons_block *cons_block; |
34400008 GM |
2486 | |
2487 | /* Index of first unused Lisp_Cons in the current block. */ | |
2488 | ||
fff62aa9 | 2489 | static int cons_block_index = CONS_BLOCK_SIZE; |
2e471eb5 | 2490 | |
34400008 GM |
2491 | /* Free-list of Lisp_Cons structures. */ |
2492 | ||
244ed907 | 2493 | static struct Lisp_Cons *cons_free_list; |
2e471eb5 | 2494 | |
34400008 | 2495 | /* Explicitly free a cons cell by putting it on the free-list. */ |
2e471eb5 GM |
2496 | |
2497 | void | |
971de7fb | 2498 | free_cons (struct Lisp_Cons *ptr) |
2e471eb5 | 2499 | { |
28a099a4 | 2500 | ptr->u.chain = cons_free_list; |
34400008 | 2501 | #if GC_MARK_STACK |
c644523b | 2502 | ptr->car = Vdead; |
34400008 | 2503 | #endif |
2e471eb5 | 2504 | cons_free_list = ptr; |
0dd6d66d | 2505 | consing_since_gc -= sizeof *ptr; |
3900d5de | 2506 | total_free_conses++; |
2e471eb5 GM |
2507 | } |
2508 | ||
a7ca3326 | 2509 | DEFUN ("cons", Fcons, Scons, 2, 2, 0, |
a6266d23 | 2510 | doc: /* Create a new cons, give it CAR and CDR as components, and return it. */) |
5842a27b | 2511 | (Lisp_Object car, Lisp_Object cdr) |
2e471eb5 GM |
2512 | { |
2513 | register Lisp_Object val; | |
2514 | ||
dafc79fa | 2515 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 2516 | |
2e471eb5 GM |
2517 | if (cons_free_list) |
2518 | { | |
2519 | /* We use the cdr for chaining the free list | |
2520 | so that we won't use the same field that has the mark bit. */ | |
2521 | XSETCONS (val, cons_free_list); | |
28a099a4 | 2522 | cons_free_list = cons_free_list->u.chain; |
2e471eb5 GM |
2523 | } |
2524 | else | |
2525 | { | |
2526 | if (cons_block_index == CONS_BLOCK_SIZE) | |
2527 | { | |
38182d90 PE |
2528 | struct cons_block *new |
2529 | = lisp_align_malloc (sizeof *new, MEM_TYPE_CONS); | |
72af86bd | 2530 | memset (new->gcmarkbits, 0, sizeof new->gcmarkbits); |
2e471eb5 GM |
2531 | new->next = cons_block; |
2532 | cons_block = new; | |
2533 | cons_block_index = 0; | |
3900d5de | 2534 | total_free_conses += CONS_BLOCK_SIZE; |
2e471eb5 | 2535 | } |
6b61353c KH |
2536 | XSETCONS (val, &cons_block->conses[cons_block_index]); |
2537 | cons_block_index++; | |
2e471eb5 | 2538 | } |
177c0ea7 | 2539 | |
dafc79fa | 2540 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 2541 | |
f3fbd155 KR |
2542 | XSETCAR (val, car); |
2543 | XSETCDR (val, cdr); | |
6b61353c | 2544 | eassert (!CONS_MARKED_P (XCONS (val))); |
2e471eb5 | 2545 | consing_since_gc += sizeof (struct Lisp_Cons); |
3900d5de | 2546 | total_free_conses--; |
2e471eb5 GM |
2547 | cons_cells_consed++; |
2548 | return val; | |
2549 | } | |
2550 | ||
e5aab7e7 | 2551 | #ifdef GC_CHECK_CONS_LIST |
e3e56238 RS |
2552 | /* Get an error now if there's any junk in the cons free list. */ |
2553 | void | |
971de7fb | 2554 | check_cons_list (void) |
e3e56238 RS |
2555 | { |
2556 | struct Lisp_Cons *tail = cons_free_list; | |
2557 | ||
e3e56238 | 2558 | while (tail) |
28a099a4 | 2559 | tail = tail->u.chain; |
e3e56238 | 2560 | } |
e5aab7e7 | 2561 | #endif |
34400008 | 2562 | |
9b306d37 KS |
2563 | /* Make a list of 1, 2, 3, 4 or 5 specified objects. */ |
2564 | ||
2565 | Lisp_Object | |
971de7fb | 2566 | list1 (Lisp_Object arg1) |
9b306d37 KS |
2567 | { |
2568 | return Fcons (arg1, Qnil); | |
2569 | } | |
2e471eb5 GM |
2570 | |
2571 | Lisp_Object | |
971de7fb | 2572 | list2 (Lisp_Object arg1, Lisp_Object arg2) |
2e471eb5 GM |
2573 | { |
2574 | return Fcons (arg1, Fcons (arg2, Qnil)); | |
2575 | } | |
2576 | ||
34400008 | 2577 | |
2e471eb5 | 2578 | Lisp_Object |
971de7fb | 2579 | list3 (Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
2e471eb5 GM |
2580 | { |
2581 | return Fcons (arg1, Fcons (arg2, Fcons (arg3, Qnil))); | |
2582 | } | |
2583 | ||
34400008 | 2584 | |
2e471eb5 | 2585 | Lisp_Object |
971de7fb | 2586 | list4 (Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, Lisp_Object arg4) |
2e471eb5 GM |
2587 | { |
2588 | return Fcons (arg1, Fcons (arg2, Fcons (arg3, Fcons (arg4, Qnil)))); | |
2589 | } | |
2590 | ||
34400008 | 2591 | |
2e471eb5 | 2592 | Lisp_Object |
971de7fb | 2593 | list5 (Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, Lisp_Object arg4, Lisp_Object arg5) |
2e471eb5 GM |
2594 | { |
2595 | return Fcons (arg1, Fcons (arg2, Fcons (arg3, Fcons (arg4, | |
2596 | Fcons (arg5, Qnil))))); | |
2597 | } | |
2598 | ||
694b6c97 DA |
2599 | /* Make a list of COUNT Lisp_Objects, where ARG is the |
2600 | first one. Allocate conses from pure space if TYPE | |
3438fe21 | 2601 | is CONSTYPE_PURE, or allocate as usual if type is CONSTYPE_HEAP. */ |
694b6c97 DA |
2602 | |
2603 | Lisp_Object | |
2604 | listn (enum constype type, ptrdiff_t count, Lisp_Object arg, ...) | |
2605 | { | |
2606 | va_list ap; | |
2607 | ptrdiff_t i; | |
2608 | Lisp_Object val, *objp; | |
2609 | ||
2610 | /* Change to SAFE_ALLOCA if you hit this eassert. */ | |
663e2b3f | 2611 | eassert (count <= MAX_ALLOCA / word_size); |
694b6c97 | 2612 | |
663e2b3f | 2613 | objp = alloca (count * word_size); |
694b6c97 DA |
2614 | objp[0] = arg; |
2615 | va_start (ap, arg); | |
2616 | for (i = 1; i < count; i++) | |
2617 | objp[i] = va_arg (ap, Lisp_Object); | |
2618 | va_end (ap); | |
2619 | ||
bcfbc9de | 2620 | for (val = Qnil, i = count - 1; i >= 0; i--) |
694b6c97 | 2621 | { |
3438fe21 | 2622 | if (type == CONSTYPE_PURE) |
694b6c97 | 2623 | val = pure_cons (objp[i], val); |
3438fe21 | 2624 | else if (type == CONSTYPE_HEAP) |
694b6c97 DA |
2625 | val = Fcons (objp[i], val); |
2626 | else | |
1088b922 | 2627 | emacs_abort (); |
694b6c97 DA |
2628 | } |
2629 | return val; | |
2630 | } | |
34400008 | 2631 | |
a7ca3326 | 2632 | DEFUN ("list", Flist, Slist, 0, MANY, 0, |
eae936e2 | 2633 | doc: /* Return a newly created list with specified arguments as elements. |
ae8e8122 MB |
2634 | Any number of arguments, even zero arguments, are allowed. |
2635 | usage: (list &rest OBJECTS) */) | |
f66c7cf8 | 2636 | (ptrdiff_t nargs, Lisp_Object *args) |
2e471eb5 GM |
2637 | { |
2638 | register Lisp_Object val; | |
2639 | val = Qnil; | |
2640 | ||
2641 | while (nargs > 0) | |
2642 | { | |
2643 | nargs--; | |
2644 | val = Fcons (args[nargs], val); | |
2645 | } | |
2646 | return val; | |
2647 | } | |
2648 | ||
34400008 | 2649 | |
a7ca3326 | 2650 | DEFUN ("make-list", Fmake_list, Smake_list, 2, 2, 0, |
a6266d23 | 2651 | doc: /* Return a newly created list of length LENGTH, with each element being INIT. */) |
5842a27b | 2652 | (register Lisp_Object length, Lisp_Object init) |
2e471eb5 GM |
2653 | { |
2654 | register Lisp_Object val; | |
14162469 | 2655 | register EMACS_INT size; |
2e471eb5 | 2656 | |
b7826503 | 2657 | CHECK_NATNUM (length); |
2e471eb5 GM |
2658 | size = XFASTINT (length); |
2659 | ||
2660 | val = Qnil; | |
ce070307 GM |
2661 | while (size > 0) |
2662 | { | |
2663 | val = Fcons (init, val); | |
2664 | --size; | |
2665 | ||
2666 | if (size > 0) | |
2667 | { | |
2668 | val = Fcons (init, val); | |
2669 | --size; | |
177c0ea7 | 2670 | |
ce070307 GM |
2671 | if (size > 0) |
2672 | { | |
2673 | val = Fcons (init, val); | |
2674 | --size; | |
177c0ea7 | 2675 | |
ce070307 GM |
2676 | if (size > 0) |
2677 | { | |
2678 | val = Fcons (init, val); | |
2679 | --size; | |
177c0ea7 | 2680 | |
ce070307 GM |
2681 | if (size > 0) |
2682 | { | |
2683 | val = Fcons (init, val); | |
2684 | --size; | |
2685 | } | |
2686 | } | |
2687 | } | |
2688 | } | |
2689 | ||
2690 | QUIT; | |
2691 | } | |
177c0ea7 | 2692 | |
7146af97 JB |
2693 | return val; |
2694 | } | |
2e471eb5 GM |
2695 | |
2696 | ||
7146af97 | 2697 | \f |
2e471eb5 GM |
2698 | /*********************************************************************** |
2699 | Vector Allocation | |
2700 | ***********************************************************************/ | |
7146af97 | 2701 | |
91f2d272 | 2702 | /* Sometimes a vector's contents are merely a pointer internally used |
13a5993b PE |
2703 | in vector allocation code. On the rare platforms where a null |
2704 | pointer cannot be tagged, represent it with a Lisp 0. | |
2705 | Usually you don't want to touch this. */ | |
91f2d272 PE |
2706 | |
2707 | static struct Lisp_Vector * | |
2708 | next_vector (struct Lisp_Vector *v) | |
2709 | { | |
2710 | return XUNTAG (v->contents[0], 0); | |
2711 | } | |
2712 | ||
2713 | static void | |
2714 | set_next_vector (struct Lisp_Vector *v, struct Lisp_Vector *p) | |
2715 | { | |
2716 | v->contents[0] = make_lisp_ptr (p, 0); | |
2717 | } | |
2718 | ||
f3372c87 DA |
2719 | /* This value is balanced well enough to avoid too much internal overhead |
2720 | for the most common cases; it's not required to be a power of two, but | |
2721 | it's expected to be a mult-of-ROUNDUP_SIZE (see below). */ | |
34400008 | 2722 | |
f3372c87 | 2723 | #define VECTOR_BLOCK_SIZE 4096 |
7146af97 | 2724 | |
dd0b0efb PE |
2725 | enum |
2726 | { | |
91f2d272 PE |
2727 | /* Alignment of struct Lisp_Vector objects. */ |
2728 | vector_alignment = COMMON_MULTIPLE (ALIGNOF_STRUCT_LISP_VECTOR, | |
2729 | USE_LSB_TAG ? GCALIGNMENT : 1), | |
2730 | ||
2731 | /* Vector size requests are a multiple of this. */ | |
2732 | roundup_size = COMMON_MULTIPLE (vector_alignment, word_size) | |
dd0b0efb | 2733 | }; |
34400008 | 2734 | |
ca95b3eb DA |
2735 | /* Verify assumptions described above. */ |
2736 | verify ((VECTOR_BLOCK_SIZE % roundup_size) == 0); | |
ee28be33 | 2737 | verify (VECTOR_BLOCK_SIZE <= (1 << PSEUDOVECTOR_SIZE_BITS)); |
ca95b3eb | 2738 | |
3e0b94e7 | 2739 | /* Round up X to nearest mult-of-ROUNDUP_SIZE --- use at compile time. */ |
df5b4930 | 2740 | #define vroundup_ct(x) ROUNDUP (x, roundup_size) |
3e0b94e7 | 2741 | /* Round up X to nearest mult-of-ROUNDUP_SIZE --- use at runtime. */ |
b9ff995e | 2742 | #define vroundup(x) (eassume ((x) >= 0), vroundup_ct (x)) |
f3372c87 DA |
2743 | |
2744 | /* Rounding helps to maintain alignment constraints if USE_LSB_TAG. */ | |
2745 | ||
3e0b94e7 | 2746 | #define VECTOR_BLOCK_BYTES (VECTOR_BLOCK_SIZE - vroundup_ct (sizeof (void *))) |
f3372c87 DA |
2747 | |
2748 | /* Size of the minimal vector allocated from block. */ | |
2749 | ||
3e0b94e7 | 2750 | #define VBLOCK_BYTES_MIN vroundup_ct (header_size + sizeof (Lisp_Object)) |
f3372c87 DA |
2751 | |
2752 | /* Size of the largest vector allocated from block. */ | |
2753 | ||
2754 | #define VBLOCK_BYTES_MAX \ | |
d06714cb | 2755 | vroundup ((VECTOR_BLOCK_BYTES / 2) - word_size) |
f3372c87 DA |
2756 | |
2757 | /* We maintain one free list for each possible block-allocated | |
2758 | vector size, and this is the number of free lists we have. */ | |
2759 | ||
2760 | #define VECTOR_MAX_FREE_LIST_INDEX \ | |
2761 | ((VECTOR_BLOCK_BYTES - VBLOCK_BYTES_MIN) / roundup_size + 1) | |
2762 | ||
f3372c87 DA |
2763 | /* Common shortcut to advance vector pointer over a block data. */ |
2764 | ||
2765 | #define ADVANCE(v, nbytes) ((struct Lisp_Vector *) ((char *) (v) + (nbytes))) | |
2766 | ||
2767 | /* Common shortcut to calculate NBYTES-vector index in VECTOR_FREE_LISTS. */ | |
2768 | ||
2769 | #define VINDEX(nbytes) (((nbytes) - VBLOCK_BYTES_MIN) / roundup_size) | |
2770 | ||
2771 | /* Common shortcut to setup vector on a free list. */ | |
2772 | ||
914adc42 DA |
2773 | #define SETUP_ON_FREE_LIST(v, nbytes, tmp) \ |
2774 | do { \ | |
2775 | (tmp) = ((nbytes - header_size) / word_size); \ | |
2776 | XSETPVECTYPESIZE (v, PVEC_FREE, 0, (tmp)); \ | |
2777 | eassert ((nbytes) % roundup_size == 0); \ | |
2778 | (tmp) = VINDEX (nbytes); \ | |
2779 | eassert ((tmp) < VECTOR_MAX_FREE_LIST_INDEX); \ | |
91f2d272 | 2780 | set_next_vector (v, vector_free_lists[tmp]); \ |
914adc42 DA |
2781 | vector_free_lists[tmp] = (v); \ |
2782 | total_free_vector_slots += (nbytes) / word_size; \ | |
f3372c87 DA |
2783 | } while (0) |
2784 | ||
914adc42 | 2785 | /* This internal type is used to maintain the list of large vectors |
91f2d272 PE |
2786 | which are allocated at their own, e.g. outside of vector blocks. |
2787 | ||
2788 | struct large_vector itself cannot contain a struct Lisp_Vector, as | |
2789 | the latter contains a flexible array member and C99 does not allow | |
2790 | such structs to be nested. Instead, each struct large_vector | |
2791 | object LV is followed by a struct Lisp_Vector, which is at offset | |
2792 | large_vector_offset from LV, and whose address is therefore | |
2793 | large_vector_vec (&LV). */ | |
914adc42 DA |
2794 | |
2795 | struct large_vector | |
2796 | { | |
91f2d272 | 2797 | struct large_vector *next; |
914adc42 DA |
2798 | }; |
2799 | ||
91f2d272 PE |
2800 | enum |
2801 | { | |
2802 | large_vector_offset = ROUNDUP (sizeof (struct large_vector), vector_alignment) | |
2803 | }; | |
2804 | ||
2805 | static struct Lisp_Vector * | |
2806 | large_vector_vec (struct large_vector *p) | |
2807 | { | |
2808 | return (struct Lisp_Vector *) ((char *) p + large_vector_offset); | |
2809 | } | |
2810 | ||
914adc42 DA |
2811 | /* This internal type is used to maintain an underlying storage |
2812 | for small vectors. */ | |
2813 | ||
f3372c87 DA |
2814 | struct vector_block |
2815 | { | |
2816 | char data[VECTOR_BLOCK_BYTES]; | |
2817 | struct vector_block *next; | |
2818 | }; | |
2819 | ||
2820 | /* Chain of vector blocks. */ | |
2821 | ||
2822 | static struct vector_block *vector_blocks; | |
2823 | ||
2824 | /* Vector free lists, where NTH item points to a chain of free | |
2825 | vectors of the same NBYTES size, so NTH == VINDEX (NBYTES). */ | |
2826 | ||
2827 | static struct Lisp_Vector *vector_free_lists[VECTOR_MAX_FREE_LIST_INDEX]; | |
2828 | ||
2829 | /* Singly-linked list of large vectors. */ | |
2830 | ||
914adc42 | 2831 | static struct large_vector *large_vectors; |
f3372c87 DA |
2832 | |
2833 | /* The only vector with 0 slots, allocated from pure space. */ | |
2834 | ||
9730daca | 2835 | Lisp_Object zero_vector; |
f3372c87 | 2836 | |
3ab6e069 DA |
2837 | /* Number of live vectors. */ |
2838 | ||
2839 | static EMACS_INT total_vectors; | |
2840 | ||
5b835e1d | 2841 | /* Total size of live and free vectors, in Lisp_Object units. */ |
3ab6e069 | 2842 | |
5b835e1d | 2843 | static EMACS_INT total_vector_slots, total_free_vector_slots; |
3ab6e069 | 2844 | |
f3372c87 DA |
2845 | /* Get a new vector block. */ |
2846 | ||
2847 | static struct vector_block * | |
2848 | allocate_vector_block (void) | |
2849 | { | |
38182d90 | 2850 | struct vector_block *block = xmalloc (sizeof *block); |
f3372c87 DA |
2851 | |
2852 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK | |
2853 | mem_insert (block->data, block->data + VECTOR_BLOCK_BYTES, | |
2854 | MEM_TYPE_VECTOR_BLOCK); | |
2855 | #endif | |
2856 | ||
2857 | block->next = vector_blocks; | |
2858 | vector_blocks = block; | |
2859 | return block; | |
2860 | } | |
2861 | ||
2862 | /* Called once to initialize vector allocation. */ | |
2863 | ||
2864 | static void | |
2865 | init_vectors (void) | |
2866 | { | |
9730daca | 2867 | zero_vector = make_pure_vector (0); |
f3372c87 DA |
2868 | } |
2869 | ||
2870 | /* Allocate vector from a vector block. */ | |
2871 | ||
2872 | static struct Lisp_Vector * | |
2873 | allocate_vector_from_block (size_t nbytes) | |
2874 | { | |
914adc42 | 2875 | struct Lisp_Vector *vector; |
f3372c87 DA |
2876 | struct vector_block *block; |
2877 | size_t index, restbytes; | |
2878 | ||
2879 | eassert (VBLOCK_BYTES_MIN <= nbytes && nbytes <= VBLOCK_BYTES_MAX); | |
2880 | eassert (nbytes % roundup_size == 0); | |
2881 | ||
2882 | /* First, try to allocate from a free list | |
2883 | containing vectors of the requested size. */ | |
2884 | index = VINDEX (nbytes); | |
2885 | if (vector_free_lists[index]) | |
2886 | { | |
2887 | vector = vector_free_lists[index]; | |
91f2d272 | 2888 | vector_free_lists[index] = next_vector (vector); |
5b835e1d | 2889 | total_free_vector_slots -= nbytes / word_size; |
f3372c87 DA |
2890 | return vector; |
2891 | } | |
2892 | ||
2893 | /* Next, check free lists containing larger vectors. Since | |
2894 | we will split the result, we should have remaining space | |
2895 | large enough to use for one-slot vector at least. */ | |
2896 | for (index = VINDEX (nbytes + VBLOCK_BYTES_MIN); | |
2897 | index < VECTOR_MAX_FREE_LIST_INDEX; index++) | |
2898 | if (vector_free_lists[index]) | |
2899 | { | |
2900 | /* This vector is larger than requested. */ | |
2901 | vector = vector_free_lists[index]; | |
91f2d272 | 2902 | vector_free_lists[index] = next_vector (vector); |
5b835e1d | 2903 | total_free_vector_slots -= nbytes / word_size; |
f3372c87 DA |
2904 | |
2905 | /* Excess bytes are used for the smaller vector, | |
2906 | which should be set on an appropriate free list. */ | |
2907 | restbytes = index * roundup_size + VBLOCK_BYTES_MIN - nbytes; | |
2908 | eassert (restbytes % roundup_size == 0); | |
914adc42 | 2909 | SETUP_ON_FREE_LIST (ADVANCE (vector, nbytes), restbytes, index); |
f3372c87 DA |
2910 | return vector; |
2911 | } | |
2912 | ||
2913 | /* Finally, need a new vector block. */ | |
2914 | block = allocate_vector_block (); | |
2915 | ||
2916 | /* New vector will be at the beginning of this block. */ | |
2917 | vector = (struct Lisp_Vector *) block->data; | |
f3372c87 DA |
2918 | |
2919 | /* If the rest of space from this block is large enough | |
2920 | for one-slot vector at least, set up it on a free list. */ | |
2921 | restbytes = VECTOR_BLOCK_BYTES - nbytes; | |
2922 | if (restbytes >= VBLOCK_BYTES_MIN) | |
2923 | { | |
2924 | eassert (restbytes % roundup_size == 0); | |
914adc42 | 2925 | SETUP_ON_FREE_LIST (ADVANCE (vector, nbytes), restbytes, index); |
f3372c87 DA |
2926 | } |
2927 | return vector; | |
914adc42 | 2928 | } |
f3372c87 | 2929 | |
f3372c87 DA |
2930 | /* Nonzero if VECTOR pointer is valid pointer inside BLOCK. */ |
2931 | ||
2932 | #define VECTOR_IN_BLOCK(vector, block) \ | |
2933 | ((char *) (vector) <= (block)->data \ | |
2934 | + VECTOR_BLOCK_BYTES - VBLOCK_BYTES_MIN) | |
2935 | ||
914adc42 | 2936 | /* Return the memory footprint of V in bytes. */ |
ee28be33 | 2937 | |
914adc42 DA |
2938 | static ptrdiff_t |
2939 | vector_nbytes (struct Lisp_Vector *v) | |
2940 | { | |
2941 | ptrdiff_t size = v->header.size & ~ARRAY_MARK_FLAG; | |
2cf00efc | 2942 | ptrdiff_t nwords; |
914adc42 DA |
2943 | |
2944 | if (size & PSEUDOVECTOR_FLAG) | |
2945 | { | |
2946 | if (PSEUDOVECTOR_TYPEP (&v->header, PVEC_BOOL_VECTOR)) | |
3e0b94e7 DC |
2947 | { |
2948 | struct Lisp_Bool_Vector *bv = (struct Lisp_Bool_Vector *) v; | |
2cf00efc PE |
2949 | ptrdiff_t word_bytes = (bool_vector_words (bv->size) |
2950 | * sizeof (bits_word)); | |
2951 | ptrdiff_t boolvec_bytes = bool_header_size + word_bytes; | |
2952 | verify (header_size <= bool_header_size); | |
2953 | nwords = (boolvec_bytes - header_size + word_size - 1) / word_size; | |
3e0b94e7 | 2954 | } |
914adc42 | 2955 | else |
2cf00efc PE |
2956 | nwords = ((size & PSEUDOVECTOR_SIZE_MASK) |
2957 | + ((size & PSEUDOVECTOR_REST_MASK) | |
2958 | >> PSEUDOVECTOR_SIZE_BITS)); | |
914adc42 DA |
2959 | } |
2960 | else | |
2cf00efc PE |
2961 | nwords = size; |
2962 | return vroundup (header_size + word_size * nwords); | |
914adc42 | 2963 | } |
ee28be33 | 2964 | |
86bd985e DA |
2965 | /* Release extra resources still in use by VECTOR, which may be any |
2966 | vector-like object. For now, this is used just to free data in | |
2967 | font objects. */ | |
2968 | ||
2969 | static void | |
2970 | cleanup_vector (struct Lisp_Vector *vector) | |
2971 | { | |
01ae0fbf | 2972 | detect_suspicious_free (vector); |
5035fbc1 DA |
2973 | if (PSEUDOVECTOR_TYPEP (&vector->header, PVEC_FONT) |
2974 | && ((vector->header.size & PSEUDOVECTOR_SIZE_MASK) | |
2975 | == FONT_OBJECT_MAX)) | |
5ae356d9 | 2976 | { |
4346235f EZ |
2977 | struct font_driver *drv = ((struct font *) vector)->driver; |
2978 | ||
2979 | /* The font driver might sometimes be NULL, e.g. if Emacs was | |
2980 | interrupted before it had time to set it up. */ | |
2981 | if (drv) | |
2982 | { | |
2983 | /* Attempt to catch subtle bugs like Bug#16140. */ | |
2984 | eassert (valid_font_driver (drv)); | |
2985 | drv->close ((struct font *) vector); | |
2986 | } | |
5ae356d9 | 2987 | } |
86bd985e DA |
2988 | } |
2989 | ||
f3372c87 DA |
2990 | /* Reclaim space used by unmarked vectors. */ |
2991 | ||
b029599f | 2992 | NO_INLINE /* For better stack traces */ |
f3372c87 DA |
2993 | static void |
2994 | sweep_vectors (void) | |
2995 | { | |
1570ae92 | 2996 | struct vector_block *block, **bprev = &vector_blocks; |
914adc42 DA |
2997 | struct large_vector *lv, **lvprev = &large_vectors; |
2998 | struct Lisp_Vector *vector, *next; | |
f3372c87 | 2999 | |
5b835e1d | 3000 | total_vectors = total_vector_slots = total_free_vector_slots = 0; |
f3372c87 DA |
3001 | memset (vector_free_lists, 0, sizeof (vector_free_lists)); |
3002 | ||
3003 | /* Looking through vector blocks. */ | |
3004 | ||
3005 | for (block = vector_blocks; block; block = *bprev) | |
3006 | { | |
fce31d69 | 3007 | bool free_this_block = 0; |
914adc42 | 3008 | ptrdiff_t nbytes; |
f3372c87 DA |
3009 | |
3010 | for (vector = (struct Lisp_Vector *) block->data; | |
3011 | VECTOR_IN_BLOCK (vector, block); vector = next) | |
3012 | { | |
3013 | if (VECTOR_MARKED_P (vector)) | |
3014 | { | |
3015 | VECTOR_UNMARK (vector); | |
3ab6e069 | 3016 | total_vectors++; |
914adc42 DA |
3017 | nbytes = vector_nbytes (vector); |
3018 | total_vector_slots += nbytes / word_size; | |
3019 | next = ADVANCE (vector, nbytes); | |
f3372c87 DA |
3020 | } |
3021 | else | |
3022 | { | |
914adc42 | 3023 | ptrdiff_t total_bytes; |
f3372c87 | 3024 | |
86bd985e | 3025 | cleanup_vector (vector); |
914adc42 DA |
3026 | nbytes = vector_nbytes (vector); |
3027 | total_bytes = nbytes; | |
ee28be33 | 3028 | next = ADVANCE (vector, nbytes); |
f3372c87 DA |
3029 | |
3030 | /* While NEXT is not marked, try to coalesce with VECTOR, | |
3031 | thus making VECTOR of the largest possible size. */ | |
3032 | ||
3033 | while (VECTOR_IN_BLOCK (next, block)) | |
3034 | { | |
3035 | if (VECTOR_MARKED_P (next)) | |
3036 | break; | |
86bd985e | 3037 | cleanup_vector (next); |
914adc42 | 3038 | nbytes = vector_nbytes (next); |
ee28be33 | 3039 | total_bytes += nbytes; |
f3372c87 DA |
3040 | next = ADVANCE (next, nbytes); |
3041 | } | |
bfe3e0a2 | 3042 | |
ee28be33 | 3043 | eassert (total_bytes % roundup_size == 0); |
f3372c87 DA |
3044 | |
3045 | if (vector == (struct Lisp_Vector *) block->data | |
3046 | && !VECTOR_IN_BLOCK (next, block)) | |
b029599f | 3047 | /* This block should be freed because all of its |
f3372c87 DA |
3048 | space was coalesced into the only free vector. */ |
3049 | free_this_block = 1; | |
3050 | else | |
ee28be33 | 3051 | { |
ba355de0 | 3052 | size_t tmp; |
ee28be33 SM |
3053 | SETUP_ON_FREE_LIST (vector, total_bytes, tmp); |
3054 | } | |
f3372c87 DA |
3055 | } |
3056 | } | |
3057 | ||
3058 | if (free_this_block) | |
3059 | { | |
3060 | *bprev = block->next; | |
3061 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK | |
3062 | mem_delete (mem_find (block->data)); | |
3063 | #endif | |
3064 | xfree (block); | |
3065 | } | |
3066 | else | |
3067 | bprev = &block->next; | |
3068 | } | |
3069 | ||
3070 | /* Sweep large vectors. */ | |
3071 | ||
914adc42 | 3072 | for (lv = large_vectors; lv; lv = *lvprev) |
f3372c87 | 3073 | { |
91f2d272 | 3074 | vector = large_vector_vec (lv); |
f3372c87 DA |
3075 | if (VECTOR_MARKED_P (vector)) |
3076 | { | |
3077 | VECTOR_UNMARK (vector); | |
3ab6e069 | 3078 | total_vectors++; |
169925ec DA |
3079 | if (vector->header.size & PSEUDOVECTOR_FLAG) |
3080 | { | |
d06714cb PE |
3081 | /* All non-bool pseudovectors are small enough to be allocated |
3082 | from vector blocks. This code should be redesigned if some | |
3083 | pseudovector type grows beyond VBLOCK_BYTES_MAX. */ | |
3084 | eassert (PSEUDOVECTOR_TYPEP (&vector->header, PVEC_BOOL_VECTOR)); | |
3e0b94e7 | 3085 | total_vector_slots += vector_nbytes (vector) / word_size; |
169925ec DA |
3086 | } |
3087 | else | |
5b835e1d DA |
3088 | total_vector_slots |
3089 | += header_size / word_size + vector->header.size; | |
91f2d272 | 3090 | lvprev = &lv->next; |
f3372c87 DA |
3091 | } |
3092 | else | |
3093 | { | |
91f2d272 | 3094 | *lvprev = lv->next; |
914adc42 | 3095 | lisp_free (lv); |
f3372c87 DA |
3096 | } |
3097 | } | |
3098 | } | |
3099 | ||
34400008 GM |
3100 | /* Value is a pointer to a newly allocated Lisp_Vector structure |
3101 | with room for LEN Lisp_Objects. */ | |
3102 | ||
ece93c02 | 3103 | static struct Lisp_Vector * |
d311d28c | 3104 | allocate_vectorlike (ptrdiff_t len) |
1825c68d KH |
3105 | { |
3106 | struct Lisp_Vector *p; | |
3107 | ||
dafc79fa SM |
3108 | MALLOC_BLOCK_INPUT; |
3109 | ||
f3372c87 | 3110 | if (len == 0) |
9730daca | 3111 | p = XVECTOR (zero_vector); |
d12e8f5a | 3112 | else |
8bbbc977 | 3113 | { |
d12e8f5a | 3114 | size_t nbytes = header_size + len * word_size; |
f3372c87 | 3115 | |
d12e8f5a | 3116 | #ifdef DOUG_LEA_MALLOC |
f20b8315 DC |
3117 | if (!mmap_lisp_allowed_p ()) |
3118 | mallopt (M_MMAP_MAX, 0); | |
d12e8f5a | 3119 | #endif |
f3372c87 | 3120 | |
d12e8f5a DA |
3121 | if (nbytes <= VBLOCK_BYTES_MAX) |
3122 | p = allocate_vector_from_block (vroundup (nbytes)); | |
3123 | else | |
3124 | { | |
914adc42 | 3125 | struct large_vector *lv |
91f2d272 | 3126 | = lisp_malloc ((large_vector_offset + header_size |
fbe9e0b9 | 3127 | + len * word_size), |
914adc42 | 3128 | MEM_TYPE_VECTORLIKE); |
91f2d272 | 3129 | lv->next = large_vectors; |
914adc42 | 3130 | large_vectors = lv; |
91f2d272 | 3131 | p = large_vector_vec (lv); |
d12e8f5a | 3132 | } |
177c0ea7 | 3133 | |
d1658221 | 3134 | #ifdef DOUG_LEA_MALLOC |
f20b8315 DC |
3135 | if (!mmap_lisp_allowed_p ()) |
3136 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); | |
d1658221 | 3137 | #endif |
177c0ea7 | 3138 | |
faa52174 | 3139 | if (find_suspicious_object_in_range (p, (char *) p + nbytes)) |
01ae0fbf DC |
3140 | emacs_abort (); |
3141 | ||
d12e8f5a DA |
3142 | consing_since_gc += nbytes; |
3143 | vector_cells_consed += len; | |
3144 | } | |
1825c68d | 3145 | |
dafc79fa | 3146 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 3147 | |
1825c68d KH |
3148 | return p; |
3149 | } | |
3150 | ||
34400008 | 3151 | |
dd0b0efb | 3152 | /* Allocate a vector with LEN slots. */ |
ece93c02 GM |
3153 | |
3154 | struct Lisp_Vector * | |
dd0b0efb | 3155 | allocate_vector (EMACS_INT len) |
ece93c02 | 3156 | { |
dd0b0efb PE |
3157 | struct Lisp_Vector *v; |
3158 | ptrdiff_t nbytes_max = min (PTRDIFF_MAX, SIZE_MAX); | |
3159 | ||
3160 | if (min ((nbytes_max - header_size) / word_size, MOST_POSITIVE_FIXNUM) < len) | |
3161 | memory_full (SIZE_MAX); | |
3162 | v = allocate_vectorlike (len); | |
3163 | v->header.size = len; | |
ece93c02 GM |
3164 | return v; |
3165 | } | |
3166 | ||
3167 | ||
3168 | /* Allocate other vector-like structures. */ | |
3169 | ||
30f95089 | 3170 | struct Lisp_Vector * |
914adc42 | 3171 | allocate_pseudovector (int memlen, int lisplen, enum pvec_type tag) |
ece93c02 | 3172 | { |
d2029e5b | 3173 | struct Lisp_Vector *v = allocate_vectorlike (memlen); |
e46bb31a | 3174 | int i; |
177c0ea7 | 3175 | |
914adc42 DA |
3176 | /* Catch bogus values. */ |
3177 | eassert (tag <= PVEC_FONT); | |
3178 | eassert (memlen - lisplen <= (1 << PSEUDOVECTOR_REST_BITS) - 1); | |
3179 | eassert (lisplen <= (1 << PSEUDOVECTOR_SIZE_BITS) - 1); | |
3180 | ||
d2029e5b | 3181 | /* Only the first lisplen slots will be traced normally by the GC. */ |
d2029e5b | 3182 | for (i = 0; i < lisplen; ++i) |
91f2d272 | 3183 | v->contents[i] = Qnil; |
177c0ea7 | 3184 | |
914adc42 | 3185 | XSETPVECTYPESIZE (v, tag, lisplen, memlen - lisplen); |
d2029e5b SM |
3186 | return v; |
3187 | } | |
d2029e5b | 3188 | |
36429c89 DA |
3189 | struct buffer * |
3190 | allocate_buffer (void) | |
3191 | { | |
38182d90 | 3192 | struct buffer *b = lisp_malloc (sizeof *b, MEM_TYPE_BUFFER); |
36429c89 | 3193 | |
914adc42 | 3194 | BUFFER_PVEC_INIT (b); |
c752cfa9 | 3195 | /* Put B on the chain of all buffers including killed ones. */ |
914adc42 | 3196 | b->next = all_buffers; |
c752cfa9 DA |
3197 | all_buffers = b; |
3198 | /* Note that the rest fields of B are not initialized. */ | |
36429c89 DA |
3199 | return b; |
3200 | } | |
3201 | ||
ece93c02 | 3202 | struct Lisp_Hash_Table * |
878f97ff | 3203 | allocate_hash_table (void) |
ece93c02 | 3204 | { |
878f97ff | 3205 | return ALLOCATE_PSEUDOVECTOR (struct Lisp_Hash_Table, count, PVEC_HASH_TABLE); |
ece93c02 GM |
3206 | } |
3207 | ||
ece93c02 | 3208 | struct window * |
971de7fb | 3209 | allocate_window (void) |
ece93c02 | 3210 | { |
62efea5e | 3211 | struct window *w; |
177c0ea7 | 3212 | |
62efea5e DA |
3213 | w = ALLOCATE_PSEUDOVECTOR (struct window, current_matrix, PVEC_WINDOW); |
3214 | /* Users assumes that non-Lisp data is zeroed. */ | |
3215 | memset (&w->current_matrix, 0, | |
3216 | sizeof (*w) - offsetof (struct window, current_matrix)); | |
3217 | return w; | |
3218 | } | |
177c0ea7 | 3219 | |
4a729fd8 | 3220 | struct terminal * |
971de7fb | 3221 | allocate_terminal (void) |
4a729fd8 | 3222 | { |
62efea5e | 3223 | struct terminal *t; |
ece93c02 | 3224 | |
62efea5e DA |
3225 | t = ALLOCATE_PSEUDOVECTOR (struct terminal, next_terminal, PVEC_TERMINAL); |
3226 | /* Users assumes that non-Lisp data is zeroed. */ | |
3227 | memset (&t->next_terminal, 0, | |
3228 | sizeof (*t) - offsetof (struct terminal, next_terminal)); | |
d2029e5b | 3229 | return t; |
4a729fd8 | 3230 | } |
ece93c02 GM |
3231 | |
3232 | struct frame * | |
971de7fb | 3233 | allocate_frame (void) |
ece93c02 | 3234 | { |
62efea5e DA |
3235 | struct frame *f; |
3236 | ||
3237 | f = ALLOCATE_PSEUDOVECTOR (struct frame, face_cache, PVEC_FRAME); | |
3238 | /* Users assumes that non-Lisp data is zeroed. */ | |
72af86bd | 3239 | memset (&f->face_cache, 0, |
62efea5e | 3240 | sizeof (*f) - offsetof (struct frame, face_cache)); |
d2029e5b | 3241 | return f; |
ece93c02 GM |
3242 | } |
3243 | ||
ece93c02 | 3244 | struct Lisp_Process * |
971de7fb | 3245 | allocate_process (void) |
ece93c02 | 3246 | { |
62efea5e | 3247 | struct Lisp_Process *p; |
ece93c02 | 3248 | |
62efea5e DA |
3249 | p = ALLOCATE_PSEUDOVECTOR (struct Lisp_Process, pid, PVEC_PROCESS); |
3250 | /* Users assumes that non-Lisp data is zeroed. */ | |
3251 | memset (&p->pid, 0, | |
3252 | sizeof (*p) - offsetof (struct Lisp_Process, pid)); | |
3253 | return p; | |
3254 | } | |
ece93c02 | 3255 | |
a7ca3326 | 3256 | DEFUN ("make-vector", Fmake_vector, Smake_vector, 2, 2, 0, |
a6266d23 | 3257 | doc: /* Return a newly created vector of length LENGTH, with each element being INIT. |
7ee72033 | 3258 | See also the function `vector'. */) |
5842a27b | 3259 | (register Lisp_Object length, Lisp_Object init) |
7146af97 | 3260 | { |
1825c68d | 3261 | Lisp_Object vector; |
d311d28c PE |
3262 | register ptrdiff_t sizei; |
3263 | register ptrdiff_t i; | |
7146af97 JB |
3264 | register struct Lisp_Vector *p; |
3265 | ||
b7826503 | 3266 | CHECK_NATNUM (length); |
7146af97 | 3267 | |
d311d28c PE |
3268 | p = allocate_vector (XFASTINT (length)); |
3269 | sizei = XFASTINT (length); | |
ae35e756 | 3270 | for (i = 0; i < sizei; i++) |
91f2d272 | 3271 | p->contents[i] = init; |
7146af97 | 3272 | |
1825c68d | 3273 | XSETVECTOR (vector, p); |
7146af97 JB |
3274 | return vector; |
3275 | } | |
3276 | ||
34400008 | 3277 | |
a7ca3326 | 3278 | DEFUN ("vector", Fvector, Svector, 0, MANY, 0, |
eae936e2 | 3279 | doc: /* Return a newly created vector with specified arguments as elements. |
ae8e8122 MB |
3280 | Any number of arguments, even zero arguments, are allowed. |
3281 | usage: (vector &rest OBJECTS) */) | |
f66c7cf8 | 3282 | (ptrdiff_t nargs, Lisp_Object *args) |
7146af97 | 3283 | { |
f66c7cf8 | 3284 | ptrdiff_t i; |
25721f5b DA |
3285 | register Lisp_Object val = make_uninit_vector (nargs); |
3286 | register struct Lisp_Vector *p = XVECTOR (val); | |
7146af97 | 3287 | |
ae35e756 | 3288 | for (i = 0; i < nargs; i++) |
91f2d272 | 3289 | p->contents[i] = args[i]; |
7146af97 JB |
3290 | return val; |
3291 | } | |
3292 | ||
3017f87f SM |
3293 | void |
3294 | make_byte_code (struct Lisp_Vector *v) | |
3295 | { | |
ed0ca4a5 PE |
3296 | /* Don't allow the global zero_vector to become a byte code object. */ |
3297 | eassert (0 < v->header.size); | |
3298 | ||
91f2d272 PE |
3299 | if (v->header.size > 1 && STRINGP (v->contents[1]) |
3300 | && STRING_MULTIBYTE (v->contents[1])) | |
3017f87f SM |
3301 | /* BYTECODE-STRING must have been produced by Emacs 20.2 or the |
3302 | earlier because they produced a raw 8-bit string for byte-code | |
3303 | and now such a byte-code string is loaded as multibyte while | |
3304 | raw 8-bit characters converted to multibyte form. Thus, now we | |
3305 | must convert them back to the original unibyte form. */ | |
91f2d272 | 3306 | v->contents[1] = Fstring_as_unibyte (v->contents[1]); |
3017f87f SM |
3307 | XSETPVECTYPE (v, PVEC_COMPILED); |
3308 | } | |
34400008 | 3309 | |
a7ca3326 | 3310 | DEFUN ("make-byte-code", Fmake_byte_code, Smake_byte_code, 4, MANY, 0, |
a6266d23 | 3311 | doc: /* Create a byte-code object with specified arguments as elements. |
e2abe5a1 SM |
3312 | The arguments should be the ARGLIST, bytecode-string BYTE-CODE, constant |
3313 | vector CONSTANTS, maximum stack size DEPTH, (optional) DOCSTRING, | |
3314 | and (optional) INTERACTIVE-SPEC. | |
228299fa | 3315 | The first four arguments are required; at most six have any |
ae8e8122 | 3316 | significance. |
e2abe5a1 SM |
3317 | The ARGLIST can be either like the one of `lambda', in which case the arguments |
3318 | will be dynamically bound before executing the byte code, or it can be an | |
3319 | integer of the form NNNNNNNRMMMMMMM where the 7bit MMMMMMM specifies the | |
3320 | minimum number of arguments, the 7-bit NNNNNNN specifies the maximum number | |
3321 | of arguments (ignoring &rest) and the R bit specifies whether there is a &rest | |
3322 | argument to catch the left-over arguments. If such an integer is used, the | |
3323 | arguments will not be dynamically bound but will be instead pushed on the | |
3324 | stack before executing the byte-code. | |
92cc28b2 | 3325 | usage: (make-byte-code ARGLIST BYTE-CODE CONSTANTS DEPTH &optional DOCSTRING INTERACTIVE-SPEC &rest ELEMENTS) */) |
f66c7cf8 | 3326 | (ptrdiff_t nargs, Lisp_Object *args) |
7146af97 | 3327 | { |
f66c7cf8 | 3328 | ptrdiff_t i; |
25721f5b DA |
3329 | register Lisp_Object val = make_uninit_vector (nargs); |
3330 | register struct Lisp_Vector *p = XVECTOR (val); | |
7146af97 | 3331 | |
12fbe755 | 3332 | /* We used to purecopy everything here, if purify-flag was set. This worked |
3017f87f SM |
3333 | OK for Emacs-23, but with Emacs-24's lexical binding code, it can be |
3334 | dangerous, since make-byte-code is used during execution to build | |
3335 | closures, so any closure built during the preload phase would end up | |
3336 | copied into pure space, including its free variables, which is sometimes | |
3337 | just wasteful and other times plainly wrong (e.g. those free vars may want | |
3338 | to be setcar'd). */ | |
9eac9d59 | 3339 | |
ae35e756 | 3340 | for (i = 0; i < nargs; i++) |
91f2d272 | 3341 | p->contents[i] = args[i]; |
3017f87f | 3342 | make_byte_code (p); |
876c194c | 3343 | XSETCOMPILED (val, p); |
7146af97 JB |
3344 | return val; |
3345 | } | |
2e471eb5 | 3346 | |
34400008 | 3347 | |
7146af97 | 3348 | \f |
2e471eb5 GM |
3349 | /*********************************************************************** |
3350 | Symbol Allocation | |
3351 | ***********************************************************************/ | |
7146af97 | 3352 | |
d55c12ed AS |
3353 | /* Like struct Lisp_Symbol, but padded so that the size is a multiple |
3354 | of the required alignment if LSB tags are used. */ | |
3355 | ||
3356 | union aligned_Lisp_Symbol | |
3357 | { | |
3358 | struct Lisp_Symbol s; | |
bfe3e0a2 | 3359 | #if USE_LSB_TAG |
2b90362b DA |
3360 | unsigned char c[(sizeof (struct Lisp_Symbol) + GCALIGNMENT - 1) |
3361 | & -GCALIGNMENT]; | |
d55c12ed AS |
3362 | #endif |
3363 | }; | |
3364 | ||
2e471eb5 GM |
3365 | /* Each symbol_block is just under 1020 bytes long, since malloc |
3366 | really allocates in units of powers of two and uses 4 bytes for its | |
3017f87f | 3367 | own overhead. */ |
7146af97 JB |
3368 | |
3369 | #define SYMBOL_BLOCK_SIZE \ | |
d55c12ed | 3370 | ((1020 - sizeof (struct symbol_block *)) / sizeof (union aligned_Lisp_Symbol)) |
7146af97 JB |
3371 | |
3372 | struct symbol_block | |
2e471eb5 | 3373 | { |
6b61353c | 3374 | /* Place `symbols' first, to preserve alignment. */ |
d55c12ed | 3375 | union aligned_Lisp_Symbol symbols[SYMBOL_BLOCK_SIZE]; |
6b61353c | 3376 | struct symbol_block *next; |
2e471eb5 | 3377 | }; |
7146af97 | 3378 | |
34400008 GM |
3379 | /* Current symbol block and index of first unused Lisp_Symbol |
3380 | structure in it. */ | |
3381 | ||
d3d47262 | 3382 | static struct symbol_block *symbol_block; |
fff62aa9 | 3383 | static int symbol_block_index = SYMBOL_BLOCK_SIZE; |
e3b83880 SM |
3384 | /* Pointer to the first symbol_block that contains pinned symbols. |
3385 | Tests for 24.4 showed that at dump-time, Emacs contains about 15K symbols, | |
3386 | 10K of which are pinned (and all but 250 of them are interned in obarray), | |
3387 | whereas a "typical session" has in the order of 30K symbols. | |
3388 | `symbol_block_pinned' lets mark_pinned_symbols scan only 15K symbols rather | |
3389 | than 30K to find the 10K symbols we need to mark. */ | |
3390 | static struct symbol_block *symbol_block_pinned; | |
7146af97 | 3391 | |
34400008 GM |
3392 | /* List of free symbols. */ |
3393 | ||
d3d47262 | 3394 | static struct Lisp_Symbol *symbol_free_list; |
7146af97 | 3395 | |
84575e67 PE |
3396 | static void |
3397 | set_symbol_name (Lisp_Object sym, Lisp_Object name) | |
3398 | { | |
3399 | XSYMBOL (sym)->name = name; | |
3400 | } | |
3401 | ||
a7ca3326 | 3402 | DEFUN ("make-symbol", Fmake_symbol, Smake_symbol, 1, 1, 0, |
a6266d23 | 3403 | doc: /* Return a newly allocated uninterned symbol whose name is NAME. |
eadf1faa | 3404 | Its value is void, and its function definition and property list are nil. */) |
5842a27b | 3405 | (Lisp_Object name) |
7146af97 JB |
3406 | { |
3407 | register Lisp_Object val; | |
3408 | register struct Lisp_Symbol *p; | |
3409 | ||
b7826503 | 3410 | CHECK_STRING (name); |
7146af97 | 3411 | |
dafc79fa | 3412 | MALLOC_BLOCK_INPUT; |
e2984df0 | 3413 | |
7146af97 JB |
3414 | if (symbol_free_list) |
3415 | { | |
45d12a89 | 3416 | XSETSYMBOL (val, symbol_free_list); |
28a099a4 | 3417 | symbol_free_list = symbol_free_list->next; |
7146af97 JB |
3418 | } |
3419 | else | |
3420 | { | |
3421 | if (symbol_block_index == SYMBOL_BLOCK_SIZE) | |
3422 | { | |
38182d90 PE |
3423 | struct symbol_block *new |
3424 | = lisp_malloc (sizeof *new, MEM_TYPE_SYMBOL); | |
7146af97 JB |
3425 | new->next = symbol_block; |
3426 | symbol_block = new; | |
3427 | symbol_block_index = 0; | |
3900d5de | 3428 | total_free_symbols += SYMBOL_BLOCK_SIZE; |
7146af97 | 3429 | } |
d55c12ed | 3430 | XSETSYMBOL (val, &symbol_block->symbols[symbol_block_index].s); |
6b61353c | 3431 | symbol_block_index++; |
7146af97 | 3432 | } |
177c0ea7 | 3433 | |
dafc79fa | 3434 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 3435 | |
7146af97 | 3436 | p = XSYMBOL (val); |
c644523b DA |
3437 | set_symbol_name (val, name); |
3438 | set_symbol_plist (val, Qnil); | |
ce5b453a SM |
3439 | p->redirect = SYMBOL_PLAINVAL; |
3440 | SET_SYMBOL_VAL (p, Qunbound); | |
eadf1faa | 3441 | set_symbol_function (val, Qnil); |
c644523b | 3442 | set_symbol_next (val, NULL); |
e3b83880 | 3443 | p->gcmarkbit = false; |
9e713715 GM |
3444 | p->interned = SYMBOL_UNINTERNED; |
3445 | p->constant = 0; | |
e3b83880 SM |
3446 | p->declared_special = false; |
3447 | p->pinned = false; | |
2e471eb5 GM |
3448 | consing_since_gc += sizeof (struct Lisp_Symbol); |
3449 | symbols_consed++; | |
3900d5de | 3450 | total_free_symbols--; |
7146af97 JB |
3451 | return val; |
3452 | } | |
3453 | ||
3f25e183 | 3454 | |
2e471eb5 GM |
3455 | \f |
3456 | /*********************************************************************** | |
34400008 | 3457 | Marker (Misc) Allocation |
2e471eb5 | 3458 | ***********************************************************************/ |
3f25e183 | 3459 | |
d55c12ed AS |
3460 | /* Like union Lisp_Misc, but padded so that its size is a multiple of |
3461 | the required alignment when LSB tags are used. */ | |
3462 | ||
3463 | union aligned_Lisp_Misc | |
3464 | { | |
3465 | union Lisp_Misc m; | |
bfe3e0a2 | 3466 | #if USE_LSB_TAG |
2b90362b DA |
3467 | unsigned char c[(sizeof (union Lisp_Misc) + GCALIGNMENT - 1) |
3468 | & -GCALIGNMENT]; | |
d55c12ed AS |
3469 | #endif |
3470 | }; | |
3471 | ||
2e471eb5 GM |
3472 | /* Allocation of markers and other objects that share that structure. |
3473 | Works like allocation of conses. */ | |
c0696668 | 3474 | |
2e471eb5 | 3475 | #define MARKER_BLOCK_SIZE \ |
d55c12ed | 3476 | ((1020 - sizeof (struct marker_block *)) / sizeof (union aligned_Lisp_Misc)) |
2e471eb5 GM |
3477 | |
3478 | struct marker_block | |
c0696668 | 3479 | { |
6b61353c | 3480 | /* Place `markers' first, to preserve alignment. */ |
d55c12ed | 3481 | union aligned_Lisp_Misc markers[MARKER_BLOCK_SIZE]; |
6b61353c | 3482 | struct marker_block *next; |
2e471eb5 | 3483 | }; |
c0696668 | 3484 | |
d3d47262 | 3485 | static struct marker_block *marker_block; |
fff62aa9 | 3486 | static int marker_block_index = MARKER_BLOCK_SIZE; |
c0696668 | 3487 | |
d3d47262 | 3488 | static union Lisp_Misc *marker_free_list; |
c0696668 | 3489 | |
d7a7fda3 | 3490 | /* Return a newly allocated Lisp_Misc object of specified TYPE. */ |
2e471eb5 | 3491 | |
1b971ac1 | 3492 | static Lisp_Object |
d7a7fda3 | 3493 | allocate_misc (enum Lisp_Misc_Type type) |
7146af97 | 3494 | { |
2e471eb5 | 3495 | Lisp_Object val; |
7146af97 | 3496 | |
dafc79fa | 3497 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 3498 | |
2e471eb5 | 3499 | if (marker_free_list) |
7146af97 | 3500 | { |
2e471eb5 GM |
3501 | XSETMISC (val, marker_free_list); |
3502 | marker_free_list = marker_free_list->u_free.chain; | |
7146af97 JB |
3503 | } |
3504 | else | |
7146af97 | 3505 | { |
2e471eb5 GM |
3506 | if (marker_block_index == MARKER_BLOCK_SIZE) |
3507 | { | |
38182d90 | 3508 | struct marker_block *new = lisp_malloc (sizeof *new, MEM_TYPE_MISC); |
2e471eb5 GM |
3509 | new->next = marker_block; |
3510 | marker_block = new; | |
3511 | marker_block_index = 0; | |
7b7990cc | 3512 | total_free_markers += MARKER_BLOCK_SIZE; |
2e471eb5 | 3513 | } |
d55c12ed | 3514 | XSETMISC (val, &marker_block->markers[marker_block_index].m); |
6b61353c | 3515 | marker_block_index++; |
7146af97 | 3516 | } |
177c0ea7 | 3517 | |
dafc79fa | 3518 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 3519 | |
7b7990cc | 3520 | --total_free_markers; |
2e471eb5 GM |
3521 | consing_since_gc += sizeof (union Lisp_Misc); |
3522 | misc_objects_consed++; | |
84575e67 | 3523 | XMISCANY (val)->type = type; |
67ee9f6e | 3524 | XMISCANY (val)->gcmarkbit = 0; |
2e471eb5 GM |
3525 | return val; |
3526 | } | |
3527 | ||
73ebd38f | 3528 | /* Free a Lisp_Misc object. */ |
7b7990cc | 3529 | |
73ebd38f | 3530 | void |
971de7fb | 3531 | free_misc (Lisp_Object misc) |
7b7990cc | 3532 | { |
84575e67 | 3533 | XMISCANY (misc)->type = Lisp_Misc_Free; |
7b7990cc KS |
3534 | XMISC (misc)->u_free.chain = marker_free_list; |
3535 | marker_free_list = XMISC (misc); | |
0dd6d66d | 3536 | consing_since_gc -= sizeof (union Lisp_Misc); |
7b7990cc KS |
3537 | total_free_markers++; |
3538 | } | |
3539 | ||
7b1123d8 PE |
3540 | /* Verify properties of Lisp_Save_Value's representation |
3541 | that are assumed here and elsewhere. */ | |
3542 | ||
3543 | verify (SAVE_UNUSED == 0); | |
52a9bcae PE |
3544 | verify (((SAVE_INTEGER | SAVE_POINTER | SAVE_FUNCPOINTER | SAVE_OBJECT) |
3545 | >> SAVE_SLOT_BITS) | |
3546 | == 0); | |
7b1123d8 | 3547 | |
1396ac86 PE |
3548 | /* Return Lisp_Save_Value objects for the various combinations |
3549 | that callers need. */ | |
1b971ac1 DA |
3550 | |
3551 | Lisp_Object | |
1396ac86 | 3552 | make_save_int_int_int (ptrdiff_t a, ptrdiff_t b, ptrdiff_t c) |
1b971ac1 | 3553 | { |
1b971ac1 DA |
3554 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); |
3555 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
1396ac86 PE |
3556 | p->save_type = SAVE_TYPE_INT_INT_INT; |
3557 | p->data[0].integer = a; | |
3558 | p->data[1].integer = b; | |
3559 | p->data[2].integer = c; | |
3560 | return val; | |
3561 | } | |
1b971ac1 | 3562 | |
1396ac86 PE |
3563 | Lisp_Object |
3564 | make_save_obj_obj_obj_obj (Lisp_Object a, Lisp_Object b, Lisp_Object c, | |
3565 | Lisp_Object d) | |
3566 | { | |
3567 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); | |
3568 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
3569 | p->save_type = SAVE_TYPE_OBJ_OBJ_OBJ_OBJ; | |
3570 | p->data[0].object = a; | |
3571 | p->data[1].object = b; | |
3572 | p->data[2].object = c; | |
3573 | p->data[3].object = d; | |
3574 | return val; | |
3575 | } | |
1b971ac1 | 3576 | |
1396ac86 PE |
3577 | Lisp_Object |
3578 | make_save_ptr (void *a) | |
3579 | { | |
3580 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); | |
3581 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
3582 | p->save_type = SAVE_POINTER; | |
3583 | p->data[0].pointer = a; | |
3584 | return val; | |
3585 | } | |
7b1123d8 | 3586 | |
1396ac86 PE |
3587 | Lisp_Object |
3588 | make_save_ptr_int (void *a, ptrdiff_t b) | |
3589 | { | |
3590 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); | |
3591 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
3592 | p->save_type = SAVE_TYPE_PTR_INT; | |
3593 | p->data[0].pointer = a; | |
3594 | p->data[1].integer = b; | |
3595 | return val; | |
3596 | } | |
1b971ac1 | 3597 | |
7cdf484b | 3598 | #if ! (defined USE_X_TOOLKIT || defined USE_GTK) |
f4e891b5 PE |
3599 | Lisp_Object |
3600 | make_save_ptr_ptr (void *a, void *b) | |
3601 | { | |
3602 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); | |
3603 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
3604 | p->save_type = SAVE_TYPE_PTR_PTR; | |
3605 | p->data[0].pointer = a; | |
3606 | p->data[1].pointer = b; | |
3607 | return val; | |
3608 | } | |
3609 | #endif | |
3610 | ||
1396ac86 PE |
3611 | Lisp_Object |
3612 | make_save_funcptr_ptr_obj (void (*a) (void), void *b, Lisp_Object c) | |
3613 | { | |
3614 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); | |
3615 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
3616 | p->save_type = SAVE_TYPE_FUNCPTR_PTR_OBJ; | |
3617 | p->data[0].funcpointer = a; | |
3618 | p->data[1].pointer = b; | |
3619 | p->data[2].object = c; | |
1b971ac1 DA |
3620 | return val; |
3621 | } | |
3622 | ||
1396ac86 PE |
3623 | /* Return a Lisp_Save_Value object that represents an array A |
3624 | of N Lisp objects. */ | |
42172a6b RS |
3625 | |
3626 | Lisp_Object | |
1396ac86 | 3627 | make_save_memory (Lisp_Object *a, ptrdiff_t n) |
42172a6b | 3628 | { |
468afbac DA |
3629 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); |
3630 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
1396ac86 PE |
3631 | p->save_type = SAVE_TYPE_MEMORY; |
3632 | p->data[0].pointer = a; | |
3633 | p->data[1].integer = n; | |
468afbac | 3634 | return val; |
42172a6b RS |
3635 | } |
3636 | ||
73ebd38f DA |
3637 | /* Free a Lisp_Save_Value object. Do not use this function |
3638 | if SAVE contains pointer other than returned by xmalloc. */ | |
62c2e5ed | 3639 | |
27e498e6 | 3640 | void |
62c2e5ed DA |
3641 | free_save_value (Lisp_Object save) |
3642 | { | |
2b30549c | 3643 | xfree (XSAVE_POINTER (save, 0)); |
62c2e5ed DA |
3644 | free_misc (save); |
3645 | } | |
3646 | ||
d7a7fda3 DA |
3647 | /* Return a Lisp_Misc_Overlay object with specified START, END and PLIST. */ |
3648 | ||
3649 | Lisp_Object | |
3650 | build_overlay (Lisp_Object start, Lisp_Object end, Lisp_Object plist) | |
3651 | { | |
3652 | register Lisp_Object overlay; | |
3653 | ||
3654 | overlay = allocate_misc (Lisp_Misc_Overlay); | |
3655 | OVERLAY_START (overlay) = start; | |
3656 | OVERLAY_END (overlay) = end; | |
c644523b | 3657 | set_overlay_plist (overlay, plist); |
d7a7fda3 DA |
3658 | XOVERLAY (overlay)->next = NULL; |
3659 | return overlay; | |
3660 | } | |
3661 | ||
a7ca3326 | 3662 | DEFUN ("make-marker", Fmake_marker, Smake_marker, 0, 0, 0, |
a6266d23 | 3663 | doc: /* Return a newly allocated marker which does not point at any place. */) |
5842a27b | 3664 | (void) |
2e471eb5 | 3665 | { |
eeaea515 DA |
3666 | register Lisp_Object val; |
3667 | register struct Lisp_Marker *p; | |
7146af97 | 3668 | |
eeaea515 DA |
3669 | val = allocate_misc (Lisp_Misc_Marker); |
3670 | p = XMARKER (val); | |
3671 | p->buffer = 0; | |
3672 | p->bytepos = 0; | |
3673 | p->charpos = 0; | |
3674 | p->next = NULL; | |
3675 | p->insertion_type = 0; | |
101ed2bb | 3676 | p->need_adjustment = 0; |
eeaea515 | 3677 | return val; |
7146af97 | 3678 | } |
2e471eb5 | 3679 | |
657924ff DA |
3680 | /* Return a newly allocated marker which points into BUF |
3681 | at character position CHARPOS and byte position BYTEPOS. */ | |
3682 | ||
3683 | Lisp_Object | |
3684 | build_marker (struct buffer *buf, ptrdiff_t charpos, ptrdiff_t bytepos) | |
3685 | { | |
eeaea515 DA |
3686 | Lisp_Object obj; |
3687 | struct Lisp_Marker *m; | |
657924ff DA |
3688 | |
3689 | /* No dead buffers here. */ | |
e578f381 | 3690 | eassert (BUFFER_LIVE_P (buf)); |
657924ff | 3691 | |
eeaea515 DA |
3692 | /* Every character is at least one byte. */ |
3693 | eassert (charpos <= bytepos); | |
3694 | ||
3695 | obj = allocate_misc (Lisp_Misc_Marker); | |
3696 | m = XMARKER (obj); | |
3697 | m->buffer = buf; | |
3698 | m->charpos = charpos; | |
3699 | m->bytepos = bytepos; | |
3700 | m->insertion_type = 0; | |
101ed2bb | 3701 | m->need_adjustment = 0; |
eeaea515 DA |
3702 | m->next = BUF_MARKERS (buf); |
3703 | BUF_MARKERS (buf) = m; | |
3704 | return obj; | |
657924ff DA |
3705 | } |
3706 | ||
2e471eb5 GM |
3707 | /* Put MARKER back on the free list after using it temporarily. */ |
3708 | ||
3709 | void | |
971de7fb | 3710 | free_marker (Lisp_Object marker) |
2e471eb5 | 3711 | { |
ef89c2ce | 3712 | unchain_marker (XMARKER (marker)); |
7b7990cc | 3713 | free_misc (marker); |
2e471eb5 GM |
3714 | } |
3715 | ||
c0696668 | 3716 | \f |
7146af97 | 3717 | /* Return a newly created vector or string with specified arguments as |
736471d1 RS |
3718 | elements. If all the arguments are characters that can fit |
3719 | in a string of events, make a string; otherwise, make a vector. | |
3720 | ||
3721 | Any number of arguments, even zero arguments, are allowed. */ | |
7146af97 JB |
3722 | |
3723 | Lisp_Object | |
0c90b9ee | 3724 | make_event_array (ptrdiff_t nargs, Lisp_Object *args) |
7146af97 | 3725 | { |
0c90b9ee | 3726 | ptrdiff_t i; |
7146af97 JB |
3727 | |
3728 | for (i = 0; i < nargs; i++) | |
736471d1 | 3729 | /* The things that fit in a string |
c9ca4659 RS |
3730 | are characters that are in 0...127, |
3731 | after discarding the meta bit and all the bits above it. */ | |
e687453f | 3732 | if (!INTEGERP (args[i]) |
c11285dc | 3733 | || (XINT (args[i]) & ~(-CHAR_META)) >= 0200) |
7146af97 JB |
3734 | return Fvector (nargs, args); |
3735 | ||
3736 | /* Since the loop exited, we know that all the things in it are | |
3737 | characters, so we can make a string. */ | |
3738 | { | |
c13ccad2 | 3739 | Lisp_Object result; |
177c0ea7 | 3740 | |
50aee051 | 3741 | result = Fmake_string (make_number (nargs), make_number (0)); |
7146af97 | 3742 | for (i = 0; i < nargs; i++) |
736471d1 | 3743 | { |
46e7e6b0 | 3744 | SSET (result, i, XINT (args[i])); |
736471d1 RS |
3745 | /* Move the meta bit to the right place for a string char. */ |
3746 | if (XINT (args[i]) & CHAR_META) | |
46e7e6b0 | 3747 | SSET (result, i, SREF (result, i) | 0x80); |
736471d1 | 3748 | } |
177c0ea7 | 3749 | |
7146af97 JB |
3750 | return result; |
3751 | } | |
3752 | } | |
2e471eb5 GM |
3753 | |
3754 | ||
7146af97 | 3755 | \f |
24d8a105 RS |
3756 | /************************************************************************ |
3757 | Memory Full Handling | |
3758 | ************************************************************************/ | |
3759 | ||
3760 | ||
531b0165 PE |
3761 | /* Called if malloc (NBYTES) returns zero. If NBYTES == SIZE_MAX, |
3762 | there may have been size_t overflow so that malloc was never | |
3763 | called, or perhaps malloc was invoked successfully but the | |
3764 | resulting pointer had problems fitting into a tagged EMACS_INT. In | |
3765 | either case this counts as memory being full even though malloc did | |
3766 | not fail. */ | |
24d8a105 RS |
3767 | |
3768 | void | |
531b0165 | 3769 | memory_full (size_t nbytes) |
24d8a105 | 3770 | { |
531b0165 | 3771 | /* Do not go into hysterics merely because a large request failed. */ |
fce31d69 | 3772 | bool enough_free_memory = 0; |
2b6148e4 | 3773 | if (SPARE_MEMORY < nbytes) |
531b0165 | 3774 | { |
66606eea PE |
3775 | void *p; |
3776 | ||
3777 | MALLOC_BLOCK_INPUT; | |
3778 | p = malloc (SPARE_MEMORY); | |
531b0165 PE |
3779 | if (p) |
3780 | { | |
4d09bcf6 | 3781 | free (p); |
531b0165 PE |
3782 | enough_free_memory = 1; |
3783 | } | |
66606eea | 3784 | MALLOC_UNBLOCK_INPUT; |
531b0165 | 3785 | } |
24d8a105 | 3786 | |
531b0165 PE |
3787 | if (! enough_free_memory) |
3788 | { | |
3789 | int i; | |
24d8a105 | 3790 | |
531b0165 PE |
3791 | Vmemory_full = Qt; |
3792 | ||
3793 | memory_full_cons_threshold = sizeof (struct cons_block); | |
3794 | ||
3795 | /* The first time we get here, free the spare memory. */ | |
faa52174 | 3796 | for (i = 0; i < ARRAYELTS (spare_memory); i++) |
531b0165 PE |
3797 | if (spare_memory[i]) |
3798 | { | |
3799 | if (i == 0) | |
3800 | free (spare_memory[i]); | |
3801 | else if (i >= 1 && i <= 4) | |
3802 | lisp_align_free (spare_memory[i]); | |
3803 | else | |
3804 | lisp_free (spare_memory[i]); | |
3805 | spare_memory[i] = 0; | |
3806 | } | |
531b0165 | 3807 | } |
24d8a105 RS |
3808 | |
3809 | /* This used to call error, but if we've run out of memory, we could | |
3810 | get infinite recursion trying to build the string. */ | |
9b306d37 | 3811 | xsignal (Qnil, Vmemory_signal_data); |
24d8a105 RS |
3812 | } |
3813 | ||
3814 | /* If we released our reserve (due to running out of memory), | |
3815 | and we have a fair amount free once again, | |
3816 | try to set aside another reserve in case we run out once more. | |
3817 | ||
3818 | This is called when a relocatable block is freed in ralloc.c, | |
3819 | and also directly from this file, in case we're not using ralloc.c. */ | |
3820 | ||
3821 | void | |
971de7fb | 3822 | refill_memory_reserve (void) |
24d8a105 RS |
3823 | { |
3824 | #ifndef SYSTEM_MALLOC | |
3825 | if (spare_memory[0] == 0) | |
38182d90 | 3826 | spare_memory[0] = malloc (SPARE_MEMORY); |
24d8a105 | 3827 | if (spare_memory[1] == 0) |
38182d90 | 3828 | spare_memory[1] = lisp_align_malloc (sizeof (struct cons_block), |
35aaa1ea | 3829 | MEM_TYPE_SPARE); |
24d8a105 | 3830 | if (spare_memory[2] == 0) |
38182d90 | 3831 | spare_memory[2] = lisp_align_malloc (sizeof (struct cons_block), |
35aaa1ea | 3832 | MEM_TYPE_SPARE); |
24d8a105 | 3833 | if (spare_memory[3] == 0) |
38182d90 | 3834 | spare_memory[3] = lisp_align_malloc (sizeof (struct cons_block), |
35aaa1ea | 3835 | MEM_TYPE_SPARE); |
24d8a105 | 3836 | if (spare_memory[4] == 0) |
38182d90 | 3837 | spare_memory[4] = lisp_align_malloc (sizeof (struct cons_block), |
35aaa1ea | 3838 | MEM_TYPE_SPARE); |
24d8a105 | 3839 | if (spare_memory[5] == 0) |
38182d90 | 3840 | spare_memory[5] = lisp_malloc (sizeof (struct string_block), |
35aaa1ea | 3841 | MEM_TYPE_SPARE); |
24d8a105 | 3842 | if (spare_memory[6] == 0) |
38182d90 | 3843 | spare_memory[6] = lisp_malloc (sizeof (struct string_block), |
35aaa1ea | 3844 | MEM_TYPE_SPARE); |
24d8a105 RS |
3845 | if (spare_memory[0] && spare_memory[1] && spare_memory[5]) |
3846 | Vmemory_full = Qnil; | |
3847 | #endif | |
3848 | } | |
3849 | \f | |
34400008 GM |
3850 | /************************************************************************ |
3851 | C Stack Marking | |
3852 | ************************************************************************/ | |
3853 | ||
13c844fb GM |
3854 | #if GC_MARK_STACK || defined GC_MALLOC_CHECK |
3855 | ||
71cf5fa0 GM |
3856 | /* Conservative C stack marking requires a method to identify possibly |
3857 | live Lisp objects given a pointer value. We do this by keeping | |
3858 | track of blocks of Lisp data that are allocated in a red-black tree | |
3859 | (see also the comment of mem_node which is the type of nodes in | |
3860 | that tree). Function lisp_malloc adds information for an allocated | |
3861 | block to the red-black tree with calls to mem_insert, and function | |
3862 | lisp_free removes it with mem_delete. Functions live_string_p etc | |
3863 | call mem_find to lookup information about a given pointer in the | |
3864 | tree, and use that to determine if the pointer points to a Lisp | |
3865 | object or not. */ | |
3866 | ||
34400008 GM |
3867 | /* Initialize this part of alloc.c. */ |
3868 | ||
3869 | static void | |
971de7fb | 3870 | mem_init (void) |
34400008 GM |
3871 | { |
3872 | mem_z.left = mem_z.right = MEM_NIL; | |
3873 | mem_z.parent = NULL; | |
3874 | mem_z.color = MEM_BLACK; | |
3875 | mem_z.start = mem_z.end = NULL; | |
3876 | mem_root = MEM_NIL; | |
3877 | } | |
3878 | ||
3879 | ||
3880 | /* Value is a pointer to the mem_node containing START. Value is | |
3881 | MEM_NIL if there is no node in the tree containing START. */ | |
3882 | ||
b0ab8123 | 3883 | static struct mem_node * |
971de7fb | 3884 | mem_find (void *start) |
34400008 GM |
3885 | { |
3886 | struct mem_node *p; | |
3887 | ||
ece93c02 GM |
3888 | if (start < min_heap_address || start > max_heap_address) |
3889 | return MEM_NIL; | |
3890 | ||
34400008 GM |
3891 | /* Make the search always successful to speed up the loop below. */ |
3892 | mem_z.start = start; | |
3893 | mem_z.end = (char *) start + 1; | |
3894 | ||
3895 | p = mem_root; | |
3896 | while (start < p->start || start >= p->end) | |
3897 | p = start < p->start ? p->left : p->right; | |
3898 | return p; | |
3899 | } | |
3900 | ||
3901 | ||
3902 | /* Insert a new node into the tree for a block of memory with start | |
3903 | address START, end address END, and type TYPE. Value is a | |
3904 | pointer to the node that was inserted. */ | |
3905 | ||
3906 | static struct mem_node * | |
971de7fb | 3907 | mem_insert (void *start, void *end, enum mem_type type) |
34400008 GM |
3908 | { |
3909 | struct mem_node *c, *parent, *x; | |
3910 | ||
add3c3ea | 3911 | if (min_heap_address == NULL || start < min_heap_address) |
ece93c02 | 3912 | min_heap_address = start; |
add3c3ea | 3913 | if (max_heap_address == NULL || end > max_heap_address) |
ece93c02 GM |
3914 | max_heap_address = end; |
3915 | ||
34400008 GM |
3916 | /* See where in the tree a node for START belongs. In this |
3917 | particular application, it shouldn't happen that a node is already | |
3918 | present. For debugging purposes, let's check that. */ | |
3919 | c = mem_root; | |
3920 | parent = NULL; | |
3921 | ||
3922 | #if GC_MARK_STACK != GC_MAKE_GCPROS_NOOPS | |
177c0ea7 | 3923 | |
34400008 GM |
3924 | while (c != MEM_NIL) |
3925 | { | |
3926 | if (start >= c->start && start < c->end) | |
1088b922 | 3927 | emacs_abort (); |
34400008 GM |
3928 | parent = c; |
3929 | c = start < c->start ? c->left : c->right; | |
3930 | } | |
177c0ea7 | 3931 | |
34400008 | 3932 | #else /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */ |
177c0ea7 | 3933 | |
34400008 GM |
3934 | while (c != MEM_NIL) |
3935 | { | |
3936 | parent = c; | |
3937 | c = start < c->start ? c->left : c->right; | |
3938 | } | |
177c0ea7 | 3939 | |
34400008 GM |
3940 | #endif /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */ |
3941 | ||
3942 | /* Create a new node. */ | |
877935b1 | 3943 | #ifdef GC_MALLOC_CHECK |
0caaedb1 | 3944 | x = malloc (sizeof *x); |
877935b1 | 3945 | if (x == NULL) |
1088b922 | 3946 | emacs_abort (); |
877935b1 | 3947 | #else |
23f86fce | 3948 | x = xmalloc (sizeof *x); |
877935b1 | 3949 | #endif |
34400008 GM |
3950 | x->start = start; |
3951 | x->end = end; | |
3952 | x->type = type; | |
3953 | x->parent = parent; | |
3954 | x->left = x->right = MEM_NIL; | |
3955 | x->color = MEM_RED; | |
3956 | ||
3957 | /* Insert it as child of PARENT or install it as root. */ | |
3958 | if (parent) | |
3959 | { | |
3960 | if (start < parent->start) | |
3961 | parent->left = x; | |
3962 | else | |
3963 | parent->right = x; | |
3964 | } | |
177c0ea7 | 3965 | else |
34400008 GM |
3966 | mem_root = x; |
3967 | ||
3968 | /* Re-establish red-black tree properties. */ | |
3969 | mem_insert_fixup (x); | |
877935b1 | 3970 | |
34400008 GM |
3971 | return x; |
3972 | } | |
3973 | ||
3974 | ||
3975 | /* Re-establish the red-black properties of the tree, and thereby | |
3976 | balance the tree, after node X has been inserted; X is always red. */ | |
3977 | ||
3978 | static void | |
971de7fb | 3979 | mem_insert_fixup (struct mem_node *x) |
34400008 GM |
3980 | { |
3981 | while (x != mem_root && x->parent->color == MEM_RED) | |
3982 | { | |
3983 | /* X is red and its parent is red. This is a violation of | |
3984 | red-black tree property #3. */ | |
177c0ea7 | 3985 | |
34400008 GM |
3986 | if (x->parent == x->parent->parent->left) |
3987 | { | |
3988 | /* We're on the left side of our grandparent, and Y is our | |
3989 | "uncle". */ | |
3990 | struct mem_node *y = x->parent->parent->right; | |
177c0ea7 | 3991 | |
34400008 GM |
3992 | if (y->color == MEM_RED) |
3993 | { | |
3994 | /* Uncle and parent are red but should be black because | |
3995 | X is red. Change the colors accordingly and proceed | |
3996 | with the grandparent. */ | |
3997 | x->parent->color = MEM_BLACK; | |
3998 | y->color = MEM_BLACK; | |
3999 | x->parent->parent->color = MEM_RED; | |
4000 | x = x->parent->parent; | |
4001 | } | |
4002 | else | |
4003 | { | |
4004 | /* Parent and uncle have different colors; parent is | |
4005 | red, uncle is black. */ | |
4006 | if (x == x->parent->right) | |
4007 | { | |
4008 | x = x->parent; | |
4009 | mem_rotate_left (x); | |
4010 | } | |
4011 | ||
4012 | x->parent->color = MEM_BLACK; | |
4013 | x->parent->parent->color = MEM_RED; | |
4014 | mem_rotate_right (x->parent->parent); | |
4015 | } | |
4016 | } | |
4017 | else | |
4018 | { | |
4019 | /* This is the symmetrical case of above. */ | |
4020 | struct mem_node *y = x->parent->parent->left; | |
177c0ea7 | 4021 | |
34400008 GM |
4022 | if (y->color == MEM_RED) |
4023 | { | |
4024 | x->parent->color = MEM_BLACK; | |
4025 | y->color = MEM_BLACK; | |
4026 | x->parent->parent->color = MEM_RED; | |
4027 | x = x->parent->parent; | |
4028 | } | |
4029 | else | |
4030 | { | |
4031 | if (x == x->parent->left) | |
4032 | { | |
4033 | x = x->parent; | |
4034 | mem_rotate_right (x); | |
4035 | } | |
177c0ea7 | 4036 | |
34400008 GM |
4037 | x->parent->color = MEM_BLACK; |
4038 | x->parent->parent->color = MEM_RED; | |
4039 | mem_rotate_left (x->parent->parent); | |
4040 | } | |
4041 | } | |
4042 | } | |
4043 | ||
4044 | /* The root may have been changed to red due to the algorithm. Set | |
4045 | it to black so that property #5 is satisfied. */ | |
4046 | mem_root->color = MEM_BLACK; | |
4047 | } | |
4048 | ||
4049 | ||
177c0ea7 JB |
4050 | /* (x) (y) |
4051 | / \ / \ | |
34400008 GM |
4052 | a (y) ===> (x) c |
4053 | / \ / \ | |
4054 | b c a b */ | |
4055 | ||
4056 | static void | |
971de7fb | 4057 | mem_rotate_left (struct mem_node *x) |
34400008 GM |
4058 | { |
4059 | struct mem_node *y; | |
4060 | ||
4061 | /* Turn y's left sub-tree into x's right sub-tree. */ | |
4062 | y = x->right; | |
4063 | x->right = y->left; | |
4064 | if (y->left != MEM_NIL) | |
4065 | y->left->parent = x; | |
4066 | ||
4067 | /* Y's parent was x's parent. */ | |
4068 | if (y != MEM_NIL) | |
4069 | y->parent = x->parent; | |
4070 | ||
4071 | /* Get the parent to point to y instead of x. */ | |
4072 | if (x->parent) | |
4073 | { | |
4074 | if (x == x->parent->left) | |
4075 | x->parent->left = y; | |
4076 | else | |
4077 | x->parent->right = y; | |
4078 | } | |
4079 | else | |
4080 | mem_root = y; | |
4081 | ||
4082 | /* Put x on y's left. */ | |
4083 | y->left = x; | |
4084 | if (x != MEM_NIL) | |
4085 | x->parent = y; | |
4086 | } | |
4087 | ||
4088 | ||
177c0ea7 JB |
4089 | /* (x) (Y) |
4090 | / \ / \ | |
4091 | (y) c ===> a (x) | |
4092 | / \ / \ | |
34400008 GM |
4093 | a b b c */ |
4094 | ||
4095 | static void | |
971de7fb | 4096 | mem_rotate_right (struct mem_node *x) |
34400008 GM |
4097 | { |
4098 | struct mem_node *y = x->left; | |
4099 | ||
4100 | x->left = y->right; | |
4101 | if (y->right != MEM_NIL) | |
4102 | y->right->parent = x; | |
177c0ea7 | 4103 | |
34400008 GM |
4104 | if (y != MEM_NIL) |
4105 | y->parent = x->parent; | |
4106 | if (x->parent) | |
4107 | { | |
4108 | if (x == x->parent->right) | |
4109 | x->parent->right = y; | |
4110 | else | |
4111 | x->parent->left = y; | |
4112 | } | |
4113 | else | |
4114 | mem_root = y; | |
177c0ea7 | 4115 | |
34400008 GM |
4116 | y->right = x; |
4117 | if (x != MEM_NIL) | |
4118 | x->parent = y; | |
4119 | } | |
4120 | ||
4121 | ||
4122 | /* Delete node Z from the tree. If Z is null or MEM_NIL, do nothing. */ | |
4123 | ||
4124 | static void | |
971de7fb | 4125 | mem_delete (struct mem_node *z) |
34400008 GM |
4126 | { |
4127 | struct mem_node *x, *y; | |
4128 | ||
4129 | if (!z || z == MEM_NIL) | |
4130 | return; | |
4131 | ||
4132 | if (z->left == MEM_NIL || z->right == MEM_NIL) | |
4133 | y = z; | |
4134 | else | |
4135 | { | |
4136 | y = z->right; | |
4137 | while (y->left != MEM_NIL) | |
4138 | y = y->left; | |
4139 | } | |
4140 | ||
4141 | if (y->left != MEM_NIL) | |
4142 | x = y->left; | |
4143 | else | |
4144 | x = y->right; | |
4145 | ||
4146 | x->parent = y->parent; | |
4147 | if (y->parent) | |
4148 | { | |
4149 | if (y == y->parent->left) | |
4150 | y->parent->left = x; | |
4151 | else | |
4152 | y->parent->right = x; | |
4153 | } | |
4154 | else | |
4155 | mem_root = x; | |
4156 | ||
4157 | if (y != z) | |
4158 | { | |
4159 | z->start = y->start; | |
4160 | z->end = y->end; | |
4161 | z->type = y->type; | |
4162 | } | |
177c0ea7 | 4163 | |
34400008 GM |
4164 | if (y->color == MEM_BLACK) |
4165 | mem_delete_fixup (x); | |
877935b1 GM |
4166 | |
4167 | #ifdef GC_MALLOC_CHECK | |
0caaedb1 | 4168 | free (y); |
877935b1 | 4169 | #else |
34400008 | 4170 | xfree (y); |
877935b1 | 4171 | #endif |
34400008 GM |
4172 | } |
4173 | ||
4174 | ||
4175 | /* Re-establish the red-black properties of the tree, after a | |
4176 | deletion. */ | |
4177 | ||
4178 | static void | |
971de7fb | 4179 | mem_delete_fixup (struct mem_node *x) |
34400008 GM |
4180 | { |
4181 | while (x != mem_root && x->color == MEM_BLACK) | |
4182 | { | |
4183 | if (x == x->parent->left) | |
4184 | { | |
4185 | struct mem_node *w = x->parent->right; | |
177c0ea7 | 4186 | |
34400008 GM |
4187 | if (w->color == MEM_RED) |
4188 | { | |
4189 | w->color = MEM_BLACK; | |
4190 | x->parent->color = MEM_RED; | |
4191 | mem_rotate_left (x->parent); | |
4192 | w = x->parent->right; | |
4193 | } | |
177c0ea7 | 4194 | |
34400008 GM |
4195 | if (w->left->color == MEM_BLACK && w->right->color == MEM_BLACK) |
4196 | { | |
4197 | w->color = MEM_RED; | |
4198 | x = x->parent; | |
4199 | } | |
4200 | else | |
4201 | { | |
4202 | if (w->right->color == MEM_BLACK) | |
4203 | { | |
4204 | w->left->color = MEM_BLACK; | |
4205 | w->color = MEM_RED; | |
4206 | mem_rotate_right (w); | |
4207 | w = x->parent->right; | |
4208 | } | |
4209 | w->color = x->parent->color; | |
4210 | x->parent->color = MEM_BLACK; | |
4211 | w->right->color = MEM_BLACK; | |
4212 | mem_rotate_left (x->parent); | |
4213 | x = mem_root; | |
4214 | } | |
4215 | } | |
4216 | else | |
4217 | { | |
4218 | struct mem_node *w = x->parent->left; | |
177c0ea7 | 4219 | |
34400008 GM |
4220 | if (w->color == MEM_RED) |
4221 | { | |
4222 | w->color = MEM_BLACK; | |
4223 | x->parent->color = MEM_RED; | |
4224 | mem_rotate_right (x->parent); | |
4225 | w = x->parent->left; | |
4226 | } | |
177c0ea7 | 4227 | |
34400008 GM |
4228 | if (w->right->color == MEM_BLACK && w->left->color == MEM_BLACK) |
4229 | { | |
4230 | w->color = MEM_RED; | |
4231 | x = x->parent; | |
4232 | } | |
4233 | else | |
4234 | { | |
4235 | if (w->left->color == MEM_BLACK) | |
4236 | { | |
4237 | w->right->color = MEM_BLACK; | |
4238 | w->color = MEM_RED; | |
4239 | mem_rotate_left (w); | |
4240 | w = x->parent->left; | |
4241 | } | |
177c0ea7 | 4242 | |
34400008 GM |
4243 | w->color = x->parent->color; |
4244 | x->parent->color = MEM_BLACK; | |
4245 | w->left->color = MEM_BLACK; | |
4246 | mem_rotate_right (x->parent); | |
4247 | x = mem_root; | |
4248 | } | |
4249 | } | |
4250 | } | |
177c0ea7 | 4251 | |
34400008 GM |
4252 | x->color = MEM_BLACK; |
4253 | } | |
4254 | ||
4255 | ||
4256 | /* Value is non-zero if P is a pointer to a live Lisp string on | |
4257 | the heap. M is a pointer to the mem_block for P. */ | |
4258 | ||
b0ab8123 | 4259 | static bool |
971de7fb | 4260 | live_string_p (struct mem_node *m, void *p) |
34400008 GM |
4261 | { |
4262 | if (m->type == MEM_TYPE_STRING) | |
4263 | { | |
7d652d97 | 4264 | struct string_block *b = m->start; |
14162469 | 4265 | ptrdiff_t offset = (char *) p - (char *) &b->strings[0]; |
34400008 GM |
4266 | |
4267 | /* P must point to the start of a Lisp_String structure, and it | |
4268 | must not be on the free-list. */ | |
176bc847 GM |
4269 | return (offset >= 0 |
4270 | && offset % sizeof b->strings[0] == 0 | |
6b61353c | 4271 | && offset < (STRING_BLOCK_SIZE * sizeof b->strings[0]) |
34400008 GM |
4272 | && ((struct Lisp_String *) p)->data != NULL); |
4273 | } | |
4274 | else | |
4275 | return 0; | |
4276 | } | |
4277 | ||
4278 | ||
4279 | /* Value is non-zero if P is a pointer to a live Lisp cons on | |
4280 | the heap. M is a pointer to the mem_block for P. */ | |
4281 | ||
b0ab8123 | 4282 | static bool |
971de7fb | 4283 | live_cons_p (struct mem_node *m, void *p) |
34400008 GM |
4284 | { |
4285 | if (m->type == MEM_TYPE_CONS) | |
4286 | { | |
7d652d97 | 4287 | struct cons_block *b = m->start; |
14162469 | 4288 | ptrdiff_t offset = (char *) p - (char *) &b->conses[0]; |
34400008 GM |
4289 | |
4290 | /* P must point to the start of a Lisp_Cons, not be | |
4291 | one of the unused cells in the current cons block, | |
4292 | and not be on the free-list. */ | |
176bc847 GM |
4293 | return (offset >= 0 |
4294 | && offset % sizeof b->conses[0] == 0 | |
6b61353c | 4295 | && offset < (CONS_BLOCK_SIZE * sizeof b->conses[0]) |
34400008 GM |
4296 | && (b != cons_block |
4297 | || offset / sizeof b->conses[0] < cons_block_index) | |
c644523b | 4298 | && !EQ (((struct Lisp_Cons *) p)->car, Vdead)); |
34400008 GM |
4299 | } |
4300 | else | |
4301 | return 0; | |
4302 | } | |
4303 | ||
4304 | ||
4305 | /* Value is non-zero if P is a pointer to a live Lisp symbol on | |
4306 | the heap. M is a pointer to the mem_block for P. */ | |
4307 | ||
b0ab8123 | 4308 | static bool |
971de7fb | 4309 | live_symbol_p (struct mem_node *m, void *p) |
34400008 GM |
4310 | { |
4311 | if (m->type == MEM_TYPE_SYMBOL) | |
4312 | { | |
7d652d97 | 4313 | struct symbol_block *b = m->start; |
14162469 | 4314 | ptrdiff_t offset = (char *) p - (char *) &b->symbols[0]; |
177c0ea7 | 4315 | |
34400008 GM |
4316 | /* P must point to the start of a Lisp_Symbol, not be |
4317 | one of the unused cells in the current symbol block, | |
4318 | and not be on the free-list. */ | |
176bc847 GM |
4319 | return (offset >= 0 |
4320 | && offset % sizeof b->symbols[0] == 0 | |
6b61353c | 4321 | && offset < (SYMBOL_BLOCK_SIZE * sizeof b->symbols[0]) |
34400008 GM |
4322 | && (b != symbol_block |
4323 | || offset / sizeof b->symbols[0] < symbol_block_index) | |
c644523b | 4324 | && !EQ (((struct Lisp_Symbol *)p)->function, Vdead)); |
34400008 GM |
4325 | } |
4326 | else | |
4327 | return 0; | |
4328 | } | |
4329 | ||
4330 | ||
4331 | /* Value is non-zero if P is a pointer to a live Lisp float on | |
4332 | the heap. M is a pointer to the mem_block for P. */ | |
4333 | ||
b0ab8123 | 4334 | static bool |
971de7fb | 4335 | live_float_p (struct mem_node *m, void *p) |
34400008 GM |
4336 | { |
4337 | if (m->type == MEM_TYPE_FLOAT) | |
4338 | { | |
7d652d97 | 4339 | struct float_block *b = m->start; |
14162469 | 4340 | ptrdiff_t offset = (char *) p - (char *) &b->floats[0]; |
177c0ea7 | 4341 | |
ab6780cd SM |
4342 | /* P must point to the start of a Lisp_Float and not be |
4343 | one of the unused cells in the current float block. */ | |
176bc847 GM |
4344 | return (offset >= 0 |
4345 | && offset % sizeof b->floats[0] == 0 | |
6b61353c | 4346 | && offset < (FLOAT_BLOCK_SIZE * sizeof b->floats[0]) |
34400008 | 4347 | && (b != float_block |
ab6780cd | 4348 | || offset / sizeof b->floats[0] < float_block_index)); |
34400008 GM |
4349 | } |
4350 | else | |
4351 | return 0; | |
4352 | } | |
4353 | ||
4354 | ||
4355 | /* Value is non-zero if P is a pointer to a live Lisp Misc on | |
4356 | the heap. M is a pointer to the mem_block for P. */ | |
4357 | ||
b0ab8123 | 4358 | static bool |
971de7fb | 4359 | live_misc_p (struct mem_node *m, void *p) |
34400008 GM |
4360 | { |
4361 | if (m->type == MEM_TYPE_MISC) | |
4362 | { | |
7d652d97 | 4363 | struct marker_block *b = m->start; |
14162469 | 4364 | ptrdiff_t offset = (char *) p - (char *) &b->markers[0]; |
177c0ea7 | 4365 | |
34400008 GM |
4366 | /* P must point to the start of a Lisp_Misc, not be |
4367 | one of the unused cells in the current misc block, | |
4368 | and not be on the free-list. */ | |
176bc847 GM |
4369 | return (offset >= 0 |
4370 | && offset % sizeof b->markers[0] == 0 | |
6b61353c | 4371 | && offset < (MARKER_BLOCK_SIZE * sizeof b->markers[0]) |
34400008 GM |
4372 | && (b != marker_block |
4373 | || offset / sizeof b->markers[0] < marker_block_index) | |
d314756e | 4374 | && ((union Lisp_Misc *) p)->u_any.type != Lisp_Misc_Free); |
34400008 GM |
4375 | } |
4376 | else | |
4377 | return 0; | |
4378 | } | |
4379 | ||
4380 | ||
4381 | /* Value is non-zero if P is a pointer to a live vector-like object. | |
4382 | M is a pointer to the mem_block for P. */ | |
4383 | ||
b0ab8123 | 4384 | static bool |
971de7fb | 4385 | live_vector_p (struct mem_node *m, void *p) |
34400008 | 4386 | { |
f3372c87 DA |
4387 | if (m->type == MEM_TYPE_VECTOR_BLOCK) |
4388 | { | |
4389 | /* This memory node corresponds to a vector block. */ | |
7d652d97 | 4390 | struct vector_block *block = m->start; |
f3372c87 DA |
4391 | struct Lisp_Vector *vector = (struct Lisp_Vector *) block->data; |
4392 | ||
4393 | /* P is in the block's allocation range. Scan the block | |
4394 | up to P and see whether P points to the start of some | |
4395 | vector which is not on a free list. FIXME: check whether | |
4396 | some allocation patterns (probably a lot of short vectors) | |
4397 | may cause a substantial overhead of this loop. */ | |
4398 | while (VECTOR_IN_BLOCK (vector, block) | |
4399 | && vector <= (struct Lisp_Vector *) p) | |
4400 | { | |
914adc42 | 4401 | if (!PSEUDOVECTOR_TYPEP (&vector->header, PVEC_FREE) && vector == p) |
f3372c87 DA |
4402 | return 1; |
4403 | else | |
914adc42 | 4404 | vector = ADVANCE (vector, vector_nbytes (vector)); |
f3372c87 DA |
4405 | } |
4406 | } | |
91f2d272 | 4407 | else if (m->type == MEM_TYPE_VECTORLIKE && p == large_vector_vec (m->start)) |
f3372c87 DA |
4408 | /* This memory node corresponds to a large vector. */ |
4409 | return 1; | |
4410 | return 0; | |
34400008 GM |
4411 | } |
4412 | ||
4413 | ||
2336fe58 | 4414 | /* Value is non-zero if P is a pointer to a live buffer. M is a |
34400008 GM |
4415 | pointer to the mem_block for P. */ |
4416 | ||
b0ab8123 | 4417 | static bool |
971de7fb | 4418 | live_buffer_p (struct mem_node *m, void *p) |
34400008 GM |
4419 | { |
4420 | /* P must point to the start of the block, and the buffer | |
4421 | must not have been killed. */ | |
4422 | return (m->type == MEM_TYPE_BUFFER | |
4423 | && p == m->start | |
e34f7f79 | 4424 | && !NILP (((struct buffer *) p)->INTERNAL_FIELD (name))); |
34400008 GM |
4425 | } |
4426 | ||
13c844fb GM |
4427 | #endif /* GC_MARK_STACK || defined GC_MALLOC_CHECK */ |
4428 | ||
4429 | #if GC_MARK_STACK | |
4430 | ||
34400008 GM |
4431 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
4432 | ||
0c5307b0 DA |
4433 | /* Currently not used, but may be called from gdb. */ |
4434 | ||
4435 | void dump_zombies (void) EXTERNALLY_VISIBLE; | |
4436 | ||
34400008 | 4437 | /* Array of objects that are kept alive because the C stack contains |
f224e500 | 4438 | a pattern that looks like a reference to them. */ |
34400008 GM |
4439 | |
4440 | #define MAX_ZOMBIES 10 | |
4441 | static Lisp_Object zombies[MAX_ZOMBIES]; | |
4442 | ||
4443 | /* Number of zombie objects. */ | |
4444 | ||
211a0b2a | 4445 | static EMACS_INT nzombies; |
34400008 GM |
4446 | |
4447 | /* Number of garbage collections. */ | |
4448 | ||
211a0b2a | 4449 | static EMACS_INT ngcs; |
34400008 GM |
4450 | |
4451 | /* Average percentage of zombies per collection. */ | |
4452 | ||
4453 | static double avg_zombies; | |
4454 | ||
4455 | /* Max. number of live and zombie objects. */ | |
4456 | ||
211a0b2a | 4457 | static EMACS_INT max_live, max_zombies; |
34400008 GM |
4458 | |
4459 | /* Average number of live objects per GC. */ | |
4460 | ||
4461 | static double avg_live; | |
4462 | ||
a7ca3326 | 4463 | DEFUN ("gc-status", Fgc_status, Sgc_status, 0, 0, "", |
7ee72033 | 4464 | doc: /* Show information about live and zombie objects. */) |
5842a27b | 4465 | (void) |
34400008 | 4466 | { |
83fc9c63 | 4467 | Lisp_Object args[8], zombie_list = Qnil; |
211a0b2a | 4468 | EMACS_INT i; |
6e4b3fbe | 4469 | for (i = 0; i < min (MAX_ZOMBIES, nzombies); i++) |
83fc9c63 DL |
4470 | zombie_list = Fcons (zombies[i], zombie_list); |
4471 | args[0] = build_string ("%d GCs, avg live/zombies = %.2f/%.2f (%f%%), max %d/%d\nzombies: %S"); | |
34400008 GM |
4472 | args[1] = make_number (ngcs); |
4473 | args[2] = make_float (avg_live); | |
4474 | args[3] = make_float (avg_zombies); | |
4475 | args[4] = make_float (avg_zombies / avg_live / 100); | |
4476 | args[5] = make_number (max_live); | |
4477 | args[6] = make_number (max_zombies); | |
83fc9c63 DL |
4478 | args[7] = zombie_list; |
4479 | return Fmessage (8, args); | |
34400008 GM |
4480 | } |
4481 | ||
4482 | #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */ | |
4483 | ||
4484 | ||
182ff242 GM |
4485 | /* Mark OBJ if we can prove it's a Lisp_Object. */ |
4486 | ||
b0ab8123 | 4487 | static void |
971de7fb | 4488 | mark_maybe_object (Lisp_Object obj) |
182ff242 | 4489 | { |
b609f591 YM |
4490 | void *po; |
4491 | struct mem_node *m; | |
4492 | ||
a84683fd DC |
4493 | #if USE_VALGRIND |
4494 | if (valgrind_p) | |
4495 | VALGRIND_MAKE_MEM_DEFINED (&obj, sizeof (obj)); | |
4496 | #endif | |
4497 | ||
b609f591 YM |
4498 | if (INTEGERP (obj)) |
4499 | return; | |
4500 | ||
4501 | po = (void *) XPNTR (obj); | |
4502 | m = mem_find (po); | |
177c0ea7 | 4503 | |
182ff242 GM |
4504 | if (m != MEM_NIL) |
4505 | { | |
fce31d69 | 4506 | bool mark_p = 0; |
182ff242 | 4507 | |
8e50cc2d | 4508 | switch (XTYPE (obj)) |
182ff242 GM |
4509 | { |
4510 | case Lisp_String: | |
4511 | mark_p = (live_string_p (m, po) | |
4512 | && !STRING_MARKED_P ((struct Lisp_String *) po)); | |
4513 | break; | |
4514 | ||
4515 | case Lisp_Cons: | |
08b7c2cb | 4516 | mark_p = (live_cons_p (m, po) && !CONS_MARKED_P (XCONS (obj))); |
182ff242 GM |
4517 | break; |
4518 | ||
4519 | case Lisp_Symbol: | |
2336fe58 | 4520 | mark_p = (live_symbol_p (m, po) && !XSYMBOL (obj)->gcmarkbit); |
182ff242 GM |
4521 | break; |
4522 | ||
4523 | case Lisp_Float: | |
ab6780cd | 4524 | mark_p = (live_float_p (m, po) && !FLOAT_MARKED_P (XFLOAT (obj))); |
182ff242 GM |
4525 | break; |
4526 | ||
4527 | case Lisp_Vectorlike: | |
8e50cc2d | 4528 | /* Note: can't check BUFFERP before we know it's a |
182ff242 GM |
4529 | buffer because checking that dereferences the pointer |
4530 | PO which might point anywhere. */ | |
4531 | if (live_vector_p (m, po)) | |
8e50cc2d | 4532 | mark_p = !SUBRP (obj) && !VECTOR_MARKED_P (XVECTOR (obj)); |
182ff242 | 4533 | else if (live_buffer_p (m, po)) |
8e50cc2d | 4534 | mark_p = BUFFERP (obj) && !VECTOR_MARKED_P (XBUFFER (obj)); |
182ff242 GM |
4535 | break; |
4536 | ||
4537 | case Lisp_Misc: | |
67ee9f6e | 4538 | mark_p = (live_misc_p (m, po) && !XMISCANY (obj)->gcmarkbit); |
182ff242 | 4539 | break; |
6bbd7a29 | 4540 | |
2de9f71c | 4541 | default: |
6bbd7a29 | 4542 | break; |
182ff242 GM |
4543 | } |
4544 | ||
4545 | if (mark_p) | |
4546 | { | |
4547 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES | |
4548 | if (nzombies < MAX_ZOMBIES) | |
83fc9c63 | 4549 | zombies[nzombies] = obj; |
182ff242 GM |
4550 | ++nzombies; |
4551 | #endif | |
49723c04 | 4552 | mark_object (obj); |
182ff242 GM |
4553 | } |
4554 | } | |
4555 | } | |
ece93c02 | 4556 | |
8d3103b1 DA |
4557 | /* Return true if P can point to Lisp data, and false otherwise. |
4558 | USE_LSB_TAG needs Lisp data to be aligned on multiples of GCALIGNMENT. | |
4559 | Otherwise, assume that Lisp data is aligned on even addresses. */ | |
ece93c02 | 4560 | |
8d3103b1 DA |
4561 | static bool |
4562 | maybe_lisp_pointer (void *p) | |
4563 | { | |
4564 | return !((intptr_t) p % (USE_LSB_TAG ? GCALIGNMENT : 2)); | |
4565 | } | |
15684f52 | 4566 | |
ece93c02 GM |
4567 | /* If P points to Lisp data, mark that as live if it isn't already |
4568 | marked. */ | |
4569 | ||
b0ab8123 | 4570 | static void |
971de7fb | 4571 | mark_maybe_pointer (void *p) |
ece93c02 GM |
4572 | { |
4573 | struct mem_node *m; | |
4574 | ||
a84683fd DC |
4575 | #if USE_VALGRIND |
4576 | if (valgrind_p) | |
4577 | VALGRIND_MAKE_MEM_DEFINED (&p, sizeof (p)); | |
4578 | #endif | |
4579 | ||
8d3103b1 | 4580 | if (!maybe_lisp_pointer (p)) |
ece93c02 | 4581 | return; |
177c0ea7 | 4582 | |
ece93c02 GM |
4583 | m = mem_find (p); |
4584 | if (m != MEM_NIL) | |
4585 | { | |
4586 | Lisp_Object obj = Qnil; | |
177c0ea7 | 4587 | |
ece93c02 GM |
4588 | switch (m->type) |
4589 | { | |
4590 | case MEM_TYPE_NON_LISP: | |
5474c384 | 4591 | case MEM_TYPE_SPARE: |
2fe50224 | 4592 | /* Nothing to do; not a pointer to Lisp memory. */ |
ece93c02 | 4593 | break; |
177c0ea7 | 4594 | |
ece93c02 | 4595 | case MEM_TYPE_BUFFER: |
5e617bc2 | 4596 | if (live_buffer_p (m, p) && !VECTOR_MARKED_P ((struct buffer *)p)) |
ece93c02 GM |
4597 | XSETVECTOR (obj, p); |
4598 | break; | |
177c0ea7 | 4599 | |
ece93c02 | 4600 | case MEM_TYPE_CONS: |
08b7c2cb | 4601 | if (live_cons_p (m, p) && !CONS_MARKED_P ((struct Lisp_Cons *) p)) |
ece93c02 GM |
4602 | XSETCONS (obj, p); |
4603 | break; | |
177c0ea7 | 4604 | |
ece93c02 GM |
4605 | case MEM_TYPE_STRING: |
4606 | if (live_string_p (m, p) | |
4607 | && !STRING_MARKED_P ((struct Lisp_String *) p)) | |
4608 | XSETSTRING (obj, p); | |
4609 | break; | |
4610 | ||
4611 | case MEM_TYPE_MISC: | |
2336fe58 SM |
4612 | if (live_misc_p (m, p) && !((struct Lisp_Free *) p)->gcmarkbit) |
4613 | XSETMISC (obj, p); | |
ece93c02 | 4614 | break; |
177c0ea7 | 4615 | |
ece93c02 | 4616 | case MEM_TYPE_SYMBOL: |
2336fe58 | 4617 | if (live_symbol_p (m, p) && !((struct Lisp_Symbol *) p)->gcmarkbit) |
ece93c02 GM |
4618 | XSETSYMBOL (obj, p); |
4619 | break; | |
177c0ea7 | 4620 | |
ece93c02 | 4621 | case MEM_TYPE_FLOAT: |
ab6780cd | 4622 | if (live_float_p (m, p) && !FLOAT_MARKED_P (p)) |
ece93c02 GM |
4623 | XSETFLOAT (obj, p); |
4624 | break; | |
177c0ea7 | 4625 | |
9c545a55 | 4626 | case MEM_TYPE_VECTORLIKE: |
f3372c87 | 4627 | case MEM_TYPE_VECTOR_BLOCK: |
ece93c02 GM |
4628 | if (live_vector_p (m, p)) |
4629 | { | |
4630 | Lisp_Object tem; | |
4631 | XSETVECTOR (tem, p); | |
8e50cc2d | 4632 | if (!SUBRP (tem) && !VECTOR_MARKED_P (XVECTOR (tem))) |
ece93c02 GM |
4633 | obj = tem; |
4634 | } | |
4635 | break; | |
4636 | ||
4637 | default: | |
1088b922 | 4638 | emacs_abort (); |
ece93c02 GM |
4639 | } |
4640 | ||
8e50cc2d | 4641 | if (!NILP (obj)) |
49723c04 | 4642 | mark_object (obj); |
ece93c02 GM |
4643 | } |
4644 | } | |
4645 | ||
4646 | ||
e32a5799 | 4647 | /* Alignment of pointer values. Use alignof, as it sometimes returns |
e3fb2efb PE |
4648 | a smaller alignment than GCC's __alignof__ and mark_memory might |
4649 | miss objects if __alignof__ were used. */ | |
e32a5799 | 4650 | #define GC_POINTER_ALIGNMENT alignof (void *) |
3164aeac | 4651 | |
e3fb2efb PE |
4652 | /* Define POINTERS_MIGHT_HIDE_IN_OBJECTS to 1 if marking via C pointers does |
4653 | not suffice, which is the typical case. A host where a Lisp_Object is | |
4654 | wider than a pointer might allocate a Lisp_Object in non-adjacent halves. | |
4655 | If USE_LSB_TAG, the bottom half is not a valid pointer, but it should | |
4656 | suffice to widen it to to a Lisp_Object and check it that way. */ | |
bfe3e0a2 PE |
4657 | #if USE_LSB_TAG || VAL_MAX < UINTPTR_MAX |
4658 | # if !USE_LSB_TAG && VAL_MAX < UINTPTR_MAX >> GCTYPEBITS | |
e3fb2efb PE |
4659 | /* If tag bits straddle pointer-word boundaries, neither mark_maybe_pointer |
4660 | nor mark_maybe_object can follow the pointers. This should not occur on | |
4661 | any practical porting target. */ | |
4662 | # error "MSB type bits straddle pointer-word boundaries" | |
4663 | # endif | |
4664 | /* Marking via C pointers does not suffice, because Lisp_Objects contain | |
4665 | pointer words that hold pointers ORed with type bits. */ | |
4666 | # define POINTERS_MIGHT_HIDE_IN_OBJECTS 1 | |
4667 | #else | |
4668 | /* Marking via C pointers suffices, because Lisp_Objects contain pointer | |
4669 | words that hold unmodified pointers. */ | |
4670 | # define POINTERS_MIGHT_HIDE_IN_OBJECTS 0 | |
4671 | #endif | |
4672 | ||
55a314a5 YM |
4673 | /* Mark Lisp objects referenced from the address range START+OFFSET..END |
4674 | or END+OFFSET..START. */ | |
34400008 | 4675 | |
e76119d7 | 4676 | static void ATTRIBUTE_NO_SANITIZE_ADDRESS |
3164aeac | 4677 | mark_memory (void *start, void *end) |
34400008 | 4678 | { |
ece93c02 | 4679 | void **pp; |
3164aeac | 4680 | int i; |
34400008 GM |
4681 | |
4682 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES | |
4683 | nzombies = 0; | |
4684 | #endif | |
4685 | ||
4686 | /* Make START the pointer to the start of the memory region, | |
4687 | if it isn't already. */ | |
4688 | if (end < start) | |
4689 | { | |
4690 | void *tem = start; | |
4691 | start = end; | |
4692 | end = tem; | |
4693 | } | |
ece93c02 | 4694 | |
ece93c02 GM |
4695 | /* Mark Lisp data pointed to. This is necessary because, in some |
4696 | situations, the C compiler optimizes Lisp objects away, so that | |
4697 | only a pointer to them remains. Example: | |
4698 | ||
4699 | DEFUN ("testme", Ftestme, Stestme, 0, 0, 0, "") | |
7ee72033 | 4700 | () |
ece93c02 GM |
4701 | { |
4702 | Lisp_Object obj = build_string ("test"); | |
4703 | struct Lisp_String *s = XSTRING (obj); | |
4704 | Fgarbage_collect (); | |
4705 | fprintf (stderr, "test `%s'\n", s->data); | |
4706 | return Qnil; | |
4707 | } | |
4708 | ||
4709 | Here, `obj' isn't really used, and the compiler optimizes it | |
4710 | away. The only reference to the life string is through the | |
4711 | pointer `s'. */ | |
177c0ea7 | 4712 | |
3164aeac PE |
4713 | for (pp = start; (void *) pp < end; pp++) |
4714 | for (i = 0; i < sizeof *pp; i += GC_POINTER_ALIGNMENT) | |
27f3c637 | 4715 | { |
e3fb2efb PE |
4716 | void *p = *(void **) ((char *) pp + i); |
4717 | mark_maybe_pointer (p); | |
4718 | if (POINTERS_MIGHT_HIDE_IN_OBJECTS) | |
646b5f55 | 4719 | mark_maybe_object (XIL ((intptr_t) p)); |
27f3c637 | 4720 | } |
182ff242 GM |
4721 | } |
4722 | ||
182ff242 GM |
4723 | #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS |
4724 | ||
fce31d69 PE |
4725 | static bool setjmp_tested_p; |
4726 | static int longjmps_done; | |
182ff242 GM |
4727 | |
4728 | #define SETJMP_WILL_LIKELY_WORK "\ | |
4729 | \n\ | |
4730 | Emacs garbage collector has been changed to use conservative stack\n\ | |
4731 | marking. Emacs has determined that the method it uses to do the\n\ | |
4732 | marking will likely work on your system, but this isn't sure.\n\ | |
4733 | \n\ | |
4734 | If you are a system-programmer, or can get the help of a local wizard\n\ | |
4735 | who is, please take a look at the function mark_stack in alloc.c, and\n\ | |
4736 | verify that the methods used are appropriate for your system.\n\ | |
4737 | \n\ | |
d191623b | 4738 | Please mail the result to <emacs-devel@gnu.org>.\n\ |
182ff242 GM |
4739 | " |
4740 | ||
4741 | #define SETJMP_WILL_NOT_WORK "\ | |
4742 | \n\ | |
4743 | Emacs garbage collector has been changed to use conservative stack\n\ | |
4744 | marking. Emacs has determined that the default method it uses to do the\n\ | |
4745 | marking will not work on your system. We will need a system-dependent\n\ | |
4746 | solution for your system.\n\ | |
4747 | \n\ | |
4748 | Please take a look at the function mark_stack in alloc.c, and\n\ | |
4749 | try to find a way to make it work on your system.\n\ | |
30f637f8 DL |
4750 | \n\ |
4751 | Note that you may get false negatives, depending on the compiler.\n\ | |
4752 | In particular, you need to use -O with GCC for this test.\n\ | |
4753 | \n\ | |
d191623b | 4754 | Please mail the result to <emacs-devel@gnu.org>.\n\ |
182ff242 GM |
4755 | " |
4756 | ||
4757 | ||
4758 | /* Perform a quick check if it looks like setjmp saves registers in a | |
4759 | jmp_buf. Print a message to stderr saying so. When this test | |
4760 | succeeds, this is _not_ a proof that setjmp is sufficient for | |
4761 | conservative stack marking. Only the sources or a disassembly | |
4762 | can prove that. */ | |
4763 | ||
4764 | static void | |
2018939f | 4765 | test_setjmp (void) |
182ff242 GM |
4766 | { |
4767 | char buf[10]; | |
4768 | register int x; | |
0328b6de | 4769 | sys_jmp_buf jbuf; |
182ff242 GM |
4770 | |
4771 | /* Arrange for X to be put in a register. */ | |
4772 | sprintf (buf, "1"); | |
4773 | x = strlen (buf); | |
4774 | x = 2 * x - 1; | |
4775 | ||
0328b6de | 4776 | sys_setjmp (jbuf); |
182ff242 | 4777 | if (longjmps_done == 1) |
34400008 | 4778 | { |
182ff242 | 4779 | /* Came here after the longjmp at the end of the function. |
34400008 | 4780 | |
182ff242 GM |
4781 | If x == 1, the longjmp has restored the register to its |
4782 | value before the setjmp, and we can hope that setjmp | |
4783 | saves all such registers in the jmp_buf, although that | |
4784 | isn't sure. | |
34400008 | 4785 | |
182ff242 GM |
4786 | For other values of X, either something really strange is |
4787 | taking place, or the setjmp just didn't save the register. */ | |
4788 | ||
4789 | if (x == 1) | |
4790 | fprintf (stderr, SETJMP_WILL_LIKELY_WORK); | |
4791 | else | |
4792 | { | |
4793 | fprintf (stderr, SETJMP_WILL_NOT_WORK); | |
4794 | exit (1); | |
34400008 GM |
4795 | } |
4796 | } | |
182ff242 GM |
4797 | |
4798 | ++longjmps_done; | |
4799 | x = 2; | |
4800 | if (longjmps_done == 1) | |
0328b6de | 4801 | sys_longjmp (jbuf, 1); |
34400008 GM |
4802 | } |
4803 | ||
182ff242 GM |
4804 | #endif /* not GC_SAVE_REGISTERS_ON_STACK && not GC_SETJMP_WORKS */ |
4805 | ||
34400008 GM |
4806 | |
4807 | #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS | |
4808 | ||
4809 | /* Abort if anything GCPRO'd doesn't survive the GC. */ | |
4810 | ||
4811 | static void | |
2018939f | 4812 | check_gcpros (void) |
34400008 GM |
4813 | { |
4814 | struct gcpro *p; | |
f66c7cf8 | 4815 | ptrdiff_t i; |
34400008 GM |
4816 | |
4817 | for (p = gcprolist; p; p = p->next) | |
4818 | for (i = 0; i < p->nvars; ++i) | |
4819 | if (!survives_gc_p (p->var[i])) | |
92cc28b2 SM |
4820 | /* FIXME: It's not necessarily a bug. It might just be that the |
4821 | GCPRO is unnecessary or should release the object sooner. */ | |
1088b922 | 4822 | emacs_abort (); |
34400008 GM |
4823 | } |
4824 | ||
4825 | #elif GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES | |
4826 | ||
0c5307b0 | 4827 | void |
2018939f | 4828 | dump_zombies (void) |
34400008 GM |
4829 | { |
4830 | int i; | |
4831 | ||
6e4b3fbe | 4832 | fprintf (stderr, "\nZombies kept alive = %"pI"d:\n", nzombies); |
34400008 GM |
4833 | for (i = 0; i < min (MAX_ZOMBIES, nzombies); ++i) |
4834 | { | |
4835 | fprintf (stderr, " %d = ", i); | |
4836 | debug_print (zombies[i]); | |
4837 | } | |
4838 | } | |
4839 | ||
4840 | #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */ | |
4841 | ||
4842 | ||
182ff242 GM |
4843 | /* Mark live Lisp objects on the C stack. |
4844 | ||
4845 | There are several system-dependent problems to consider when | |
4846 | porting this to new architectures: | |
4847 | ||
4848 | Processor Registers | |
4849 | ||
4850 | We have to mark Lisp objects in CPU registers that can hold local | |
4851 | variables or are used to pass parameters. | |
4852 | ||
4853 | If GC_SAVE_REGISTERS_ON_STACK is defined, it should expand to | |
4854 | something that either saves relevant registers on the stack, or | |
4855 | calls mark_maybe_object passing it each register's contents. | |
4856 | ||
4857 | If GC_SAVE_REGISTERS_ON_STACK is not defined, the current | |
4858 | implementation assumes that calling setjmp saves registers we need | |
4859 | to see in a jmp_buf which itself lies on the stack. This doesn't | |
4860 | have to be true! It must be verified for each system, possibly | |
4861 | by taking a look at the source code of setjmp. | |
4862 | ||
2018939f AS |
4863 | If __builtin_unwind_init is available (defined by GCC >= 2.8) we |
4864 | can use it as a machine independent method to store all registers | |
4865 | to the stack. In this case the macros described in the previous | |
4866 | two paragraphs are not used. | |
4867 | ||
182ff242 GM |
4868 | Stack Layout |
4869 | ||
4870 | Architectures differ in the way their processor stack is organized. | |
4871 | For example, the stack might look like this | |
4872 | ||
4873 | +----------------+ | |
4874 | | Lisp_Object | size = 4 | |
4875 | +----------------+ | |
4876 | | something else | size = 2 | |
4877 | +----------------+ | |
4878 | | Lisp_Object | size = 4 | |
4879 | +----------------+ | |
4880 | | ... | | |
4881 | ||
4882 | In such a case, not every Lisp_Object will be aligned equally. To | |
4883 | find all Lisp_Object on the stack it won't be sufficient to walk | |
4884 | the stack in steps of 4 bytes. Instead, two passes will be | |
4885 | necessary, one starting at the start of the stack, and a second | |
4886 | pass starting at the start of the stack + 2. Likewise, if the | |
4887 | minimal alignment of Lisp_Objects on the stack is 1, four passes | |
4888 | would be necessary, each one starting with one byte more offset | |
c9af454e | 4889 | from the stack start. */ |
34400008 GM |
4890 | |
4891 | static void | |
c94e3311 | 4892 | mark_stack (void *end) |
34400008 | 4893 | { |
34400008 GM |
4894 | |
4895 | /* This assumes that the stack is a contiguous region in memory. If | |
182ff242 GM |
4896 | that's not the case, something has to be done here to iterate |
4897 | over the stack segments. */ | |
3164aeac PE |
4898 | mark_memory (stack_base, end); |
4899 | ||
4dec23ff AS |
4900 | /* Allow for marking a secondary stack, like the register stack on the |
4901 | ia64. */ | |
4902 | #ifdef GC_MARK_SECONDARY_STACK | |
4903 | GC_MARK_SECONDARY_STACK (); | |
4904 | #endif | |
34400008 GM |
4905 | |
4906 | #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS | |
4907 | check_gcpros (); | |
4908 | #endif | |
4909 | } | |
4910 | ||
0c5307b0 DA |
4911 | #else /* GC_MARK_STACK == 0 */ |
4912 | ||
4913 | #define mark_maybe_object(obj) emacs_abort () | |
4914 | ||
34400008 GM |
4915 | #endif /* GC_MARK_STACK != 0 */ |
4916 | ||
4917 | ||
7ffb6955 | 4918 | /* Determine whether it is safe to access memory at address P. */ |
d3d47262 | 4919 | static int |
971de7fb | 4920 | valid_pointer_p (void *p) |
7ffb6955 | 4921 | { |
f892cf9c EZ |
4922 | #ifdef WINDOWSNT |
4923 | return w32_valid_pointer_p (p, 16); | |
4924 | #else | |
41bed37d | 4925 | int fd[2]; |
7ffb6955 KS |
4926 | |
4927 | /* Obviously, we cannot just access it (we would SEGV trying), so we | |
4928 | trick the o/s to tell us whether p is a valid pointer. | |
4929 | Unfortunately, we cannot use NULL_DEVICE here, as emacs_write may | |
4930 | not validate p in that case. */ | |
4931 | ||
c7ddc792 | 4932 | if (emacs_pipe (fd) == 0) |
7ffb6955 | 4933 | { |
223752d7 | 4934 | bool valid = emacs_write (fd[1], p, 16) == 16; |
41bed37d PE |
4935 | emacs_close (fd[1]); |
4936 | emacs_close (fd[0]); | |
7ffb6955 KS |
4937 | return valid; |
4938 | } | |
4939 | ||
4940 | return -1; | |
f892cf9c | 4941 | #endif |
7ffb6955 | 4942 | } |
3cd55735 | 4943 | |
6cda572a DA |
4944 | /* Return 2 if OBJ is a killed or special buffer object, 1 if OBJ is a |
4945 | valid lisp object, 0 if OBJ is NOT a valid lisp object, or -1 if we | |
4946 | cannot validate OBJ. This function can be quite slow, so its primary | |
4947 | use is the manual debugging. The only exception is print_object, where | |
4948 | we use it to check whether the memory referenced by the pointer of | |
4949 | Lisp_Save_Value object contains valid objects. */ | |
3cd55735 KS |
4950 | |
4951 | int | |
971de7fb | 4952 | valid_lisp_object_p (Lisp_Object obj) |
3cd55735 | 4953 | { |
de7124a7 | 4954 | void *p; |
7ffb6955 | 4955 | #if GC_MARK_STACK |
3cd55735 | 4956 | struct mem_node *m; |
de7124a7 | 4957 | #endif |
3cd55735 KS |
4958 | |
4959 | if (INTEGERP (obj)) | |
4960 | return 1; | |
4961 | ||
4962 | p = (void *) XPNTR (obj); | |
3cd55735 KS |
4963 | if (PURE_POINTER_P (p)) |
4964 | return 1; | |
4965 | ||
c1ca42ca DA |
4966 | if (p == &buffer_defaults || p == &buffer_local_symbols) |
4967 | return 2; | |
4968 | ||
de7124a7 | 4969 | #if !GC_MARK_STACK |
7ffb6955 | 4970 | return valid_pointer_p (p); |
de7124a7 KS |
4971 | #else |
4972 | ||
3cd55735 KS |
4973 | m = mem_find (p); |
4974 | ||
4975 | if (m == MEM_NIL) | |
7ffb6955 KS |
4976 | { |
4977 | int valid = valid_pointer_p (p); | |
4978 | if (valid <= 0) | |
4979 | return valid; | |
4980 | ||
4981 | if (SUBRP (obj)) | |
4982 | return 1; | |
4983 | ||
4984 | return 0; | |
4985 | } | |
3cd55735 KS |
4986 | |
4987 | switch (m->type) | |
4988 | { | |
4989 | case MEM_TYPE_NON_LISP: | |
5474c384 | 4990 | case MEM_TYPE_SPARE: |
3cd55735 KS |
4991 | return 0; |
4992 | ||
4993 | case MEM_TYPE_BUFFER: | |
c1ca42ca | 4994 | return live_buffer_p (m, p) ? 1 : 2; |
3cd55735 KS |
4995 | |
4996 | case MEM_TYPE_CONS: | |
4997 | return live_cons_p (m, p); | |
4998 | ||
4999 | case MEM_TYPE_STRING: | |
5000 | return live_string_p (m, p); | |
5001 | ||
5002 | case MEM_TYPE_MISC: | |
5003 | return live_misc_p (m, p); | |
5004 | ||
5005 | case MEM_TYPE_SYMBOL: | |
5006 | return live_symbol_p (m, p); | |
5007 | ||
5008 | case MEM_TYPE_FLOAT: | |
5009 | return live_float_p (m, p); | |
5010 | ||
9c545a55 | 5011 | case MEM_TYPE_VECTORLIKE: |
f3372c87 | 5012 | case MEM_TYPE_VECTOR_BLOCK: |
3cd55735 KS |
5013 | return live_vector_p (m, p); |
5014 | ||
5015 | default: | |
5016 | break; | |
5017 | } | |
5018 | ||
5019 | return 0; | |
5020 | #endif | |
5021 | } | |
5022 | ||
8d3103b1 DA |
5023 | /* If GC_MARK_STACK, return 1 if STR is a relocatable data of Lisp_String |
5024 | (i.e. there is a non-pure Lisp_Object X so that SDATA (X) == STR) and 0 | |
5025 | if not. Otherwise we can't rely on valid_lisp_object_p and return -1. | |
5026 | This function is slow and should be used for debugging purposes. */ | |
3cd55735 | 5027 | |
8d3103b1 DA |
5028 | int |
5029 | relocatable_string_data_p (const char *str) | |
5030 | { | |
5031 | if (PURE_POINTER_P (str)) | |
5032 | return 0; | |
15684f52 | 5033 | #if GC_MARK_STACK |
8d3103b1 DA |
5034 | if (str) |
5035 | { | |
5036 | struct sdata *sdata | |
5037 | = (struct sdata *) (str - offsetof (struct sdata, data)); | |
5038 | ||
5039 | if (valid_pointer_p (sdata) | |
5040 | && valid_pointer_p (sdata->string) | |
5041 | && maybe_lisp_pointer (sdata->string)) | |
5042 | return (valid_lisp_object_p | |
5043 | (make_lisp_ptr (sdata->string, Lisp_String)) | |
5044 | && (const char *) sdata->string->data == str); | |
5045 | } | |
5046 | return 0; | |
15684f52 | 5047 | #endif /* GC_MARK_STACK */ |
8d3103b1 DA |
5048 | return -1; |
5049 | } | |
3cd55735 | 5050 | |
2e471eb5 GM |
5051 | /*********************************************************************** |
5052 | Pure Storage Management | |
5053 | ***********************************************************************/ | |
5054 | ||
1f0b3fd2 GM |
5055 | /* Allocate room for SIZE bytes from pure Lisp storage and return a |
5056 | pointer to it. TYPE is the Lisp type for which the memory is | |
e5bc14d4 | 5057 | allocated. TYPE < 0 means it's not used for a Lisp object. */ |
1f0b3fd2 | 5058 | |
261cb4bb | 5059 | static void * |
971de7fb | 5060 | pure_alloc (size_t size, int type) |
1f0b3fd2 | 5061 | { |
261cb4bb | 5062 | void *result; |
bfe3e0a2 | 5063 | #if USE_LSB_TAG |
2b90362b | 5064 | size_t alignment = GCALIGNMENT; |
6b61353c | 5065 | #else |
e32a5799 | 5066 | size_t alignment = alignof (EMACS_INT); |
1f0b3fd2 GM |
5067 | |
5068 | /* Give Lisp_Floats an extra alignment. */ | |
5069 | if (type == Lisp_Float) | |
e32a5799 | 5070 | alignment = alignof (struct Lisp_Float); |
6b61353c | 5071 | #endif |
1f0b3fd2 | 5072 | |
44117420 | 5073 | again: |
e5bc14d4 YM |
5074 | if (type >= 0) |
5075 | { | |
5076 | /* Allocate space for a Lisp object from the beginning of the free | |
5077 | space with taking account of alignment. */ | |
5078 | result = ALIGN (purebeg + pure_bytes_used_lisp, alignment); | |
5079 | pure_bytes_used_lisp = ((char *)result - (char *)purebeg) + size; | |
5080 | } | |
5081 | else | |
5082 | { | |
5083 | /* Allocate space for a non-Lisp object from the end of the free | |
5084 | space. */ | |
5085 | pure_bytes_used_non_lisp += size; | |
5086 | result = purebeg + pure_size - pure_bytes_used_non_lisp; | |
5087 | } | |
5088 | pure_bytes_used = pure_bytes_used_lisp + pure_bytes_used_non_lisp; | |
44117420 KS |
5089 | |
5090 | if (pure_bytes_used <= pure_size) | |
5091 | return result; | |
5092 | ||
5093 | /* Don't allocate a large amount here, | |
5094 | because it might get mmap'd and then its address | |
5095 | might not be usable. */ | |
23f86fce | 5096 | purebeg = xmalloc (10000); |
44117420 KS |
5097 | pure_size = 10000; |
5098 | pure_bytes_used_before_overflow += pure_bytes_used - size; | |
5099 | pure_bytes_used = 0; | |
e5bc14d4 | 5100 | pure_bytes_used_lisp = pure_bytes_used_non_lisp = 0; |
44117420 | 5101 | goto again; |
1f0b3fd2 GM |
5102 | } |
5103 | ||
5104 | ||
852f8cdc | 5105 | /* Print a warning if PURESIZE is too small. */ |
9e713715 GM |
5106 | |
5107 | void | |
971de7fb | 5108 | check_pure_size (void) |
9e713715 GM |
5109 | { |
5110 | if (pure_bytes_used_before_overflow) | |
c2982e87 PE |
5111 | message (("emacs:0:Pure Lisp storage overflow (approx. %"pI"d" |
5112 | " bytes needed)"), | |
5113 | pure_bytes_used + pure_bytes_used_before_overflow); | |
9e713715 GM |
5114 | } |
5115 | ||
5116 | ||
79fd0489 YM |
5117 | /* Find the byte sequence {DATA[0], ..., DATA[NBYTES-1], '\0'} from |
5118 | the non-Lisp data pool of the pure storage, and return its start | |
5119 | address. Return NULL if not found. */ | |
5120 | ||
5121 | static char * | |
d311d28c | 5122 | find_string_data_in_pure (const char *data, ptrdiff_t nbytes) |
79fd0489 | 5123 | { |
14162469 | 5124 | int i; |
d311d28c | 5125 | ptrdiff_t skip, bm_skip[256], last_char_skip, infinity, start, start_max; |
2aff7c53 | 5126 | const unsigned char *p; |
79fd0489 YM |
5127 | char *non_lisp_beg; |
5128 | ||
d311d28c | 5129 | if (pure_bytes_used_non_lisp <= nbytes) |
79fd0489 YM |
5130 | return NULL; |
5131 | ||
5132 | /* Set up the Boyer-Moore table. */ | |
5133 | skip = nbytes + 1; | |
5134 | for (i = 0; i < 256; i++) | |
5135 | bm_skip[i] = skip; | |
5136 | ||
2aff7c53 | 5137 | p = (const unsigned char *) data; |
79fd0489 YM |
5138 | while (--skip > 0) |
5139 | bm_skip[*p++] = skip; | |
5140 | ||
5141 | last_char_skip = bm_skip['\0']; | |
5142 | ||
5143 | non_lisp_beg = purebeg + pure_size - pure_bytes_used_non_lisp; | |
5144 | start_max = pure_bytes_used_non_lisp - (nbytes + 1); | |
5145 | ||
5146 | /* See the comments in the function `boyer_moore' (search.c) for the | |
5147 | use of `infinity'. */ | |
5148 | infinity = pure_bytes_used_non_lisp + 1; | |
5149 | bm_skip['\0'] = infinity; | |
5150 | ||
2aff7c53 | 5151 | p = (const unsigned char *) non_lisp_beg + nbytes; |
79fd0489 YM |
5152 | start = 0; |
5153 | do | |
5154 | { | |
5155 | /* Check the last character (== '\0'). */ | |
5156 | do | |
5157 | { | |
5158 | start += bm_skip[*(p + start)]; | |
5159 | } | |
5160 | while (start <= start_max); | |
5161 | ||
5162 | if (start < infinity) | |
5163 | /* Couldn't find the last character. */ | |
5164 | return NULL; | |
5165 | ||
5166 | /* No less than `infinity' means we could find the last | |
5167 | character at `p[start - infinity]'. */ | |
5168 | start -= infinity; | |
5169 | ||
5170 | /* Check the remaining characters. */ | |
5171 | if (memcmp (data, non_lisp_beg + start, nbytes) == 0) | |
5172 | /* Found. */ | |
5173 | return non_lisp_beg + start; | |
5174 | ||
5175 | start += last_char_skip; | |
5176 | } | |
5177 | while (start <= start_max); | |
5178 | ||
5179 | return NULL; | |
5180 | } | |
5181 | ||
5182 | ||
2e471eb5 GM |
5183 | /* Return a string allocated in pure space. DATA is a buffer holding |
5184 | NCHARS characters, and NBYTES bytes of string data. MULTIBYTE | |
fce31d69 | 5185 | means make the result string multibyte. |
1a4f1e2c | 5186 | |
2e471eb5 GM |
5187 | Must get an error if pure storage is full, since if it cannot hold |
5188 | a large string it may be able to hold conses that point to that | |
5189 | string; then the string is not protected from gc. */ | |
7146af97 JB |
5190 | |
5191 | Lisp_Object | |
14162469 | 5192 | make_pure_string (const char *data, |
fce31d69 | 5193 | ptrdiff_t nchars, ptrdiff_t nbytes, bool multibyte) |
7146af97 | 5194 | { |
2e471eb5 | 5195 | Lisp_Object string; |
98c6f1e3 | 5196 | struct Lisp_String *s = pure_alloc (sizeof *s, Lisp_String); |
90256841 | 5197 | s->data = (unsigned char *) find_string_data_in_pure (data, nbytes); |
79fd0489 YM |
5198 | if (s->data == NULL) |
5199 | { | |
98c6f1e3 | 5200 | s->data = pure_alloc (nbytes + 1, -1); |
72af86bd | 5201 | memcpy (s->data, data, nbytes); |
79fd0489 YM |
5202 | s->data[nbytes] = '\0'; |
5203 | } | |
2e471eb5 GM |
5204 | s->size = nchars; |
5205 | s->size_byte = multibyte ? nbytes : -1; | |
77c7bcb1 | 5206 | s->intervals = NULL; |
2e471eb5 GM |
5207 | XSETSTRING (string, s); |
5208 | return string; | |
7146af97 JB |
5209 | } |
5210 | ||
2a0213a6 DA |
5211 | /* Return a string allocated in pure space. Do not |
5212 | allocate the string data, just point to DATA. */ | |
a56eaaef DN |
5213 | |
5214 | Lisp_Object | |
2a0213a6 | 5215 | make_pure_c_string (const char *data, ptrdiff_t nchars) |
a56eaaef DN |
5216 | { |
5217 | Lisp_Object string; | |
98c6f1e3 | 5218 | struct Lisp_String *s = pure_alloc (sizeof *s, Lisp_String); |
a56eaaef DN |
5219 | s->size = nchars; |
5220 | s->size_byte = -1; | |
323637a2 | 5221 | s->data = (unsigned char *) data; |
77c7bcb1 | 5222 | s->intervals = NULL; |
a56eaaef DN |
5223 | XSETSTRING (string, s); |
5224 | return string; | |
5225 | } | |
2e471eb5 | 5226 | |
e3b83880 SM |
5227 | static Lisp_Object purecopy (Lisp_Object obj); |
5228 | ||
34400008 GM |
5229 | /* Return a cons allocated from pure space. Give it pure copies |
5230 | of CAR as car and CDR as cdr. */ | |
5231 | ||
7146af97 | 5232 | Lisp_Object |
971de7fb | 5233 | pure_cons (Lisp_Object car, Lisp_Object cdr) |
7146af97 | 5234 | { |
98c6f1e3 PE |
5235 | Lisp_Object new; |
5236 | struct Lisp_Cons *p = pure_alloc (sizeof *p, Lisp_Cons); | |
1f0b3fd2 | 5237 | XSETCONS (new, p); |
e3b83880 SM |
5238 | XSETCAR (new, purecopy (car)); |
5239 | XSETCDR (new, purecopy (cdr)); | |
7146af97 JB |
5240 | return new; |
5241 | } | |
5242 | ||
7146af97 | 5243 | |
34400008 GM |
5244 | /* Value is a float object with value NUM allocated from pure space. */ |
5245 | ||
d3d47262 | 5246 | static Lisp_Object |
971de7fb | 5247 | make_pure_float (double num) |
7146af97 | 5248 | { |
98c6f1e3 PE |
5249 | Lisp_Object new; |
5250 | struct Lisp_Float *p = pure_alloc (sizeof *p, Lisp_Float); | |
1f0b3fd2 | 5251 | XSETFLOAT (new, p); |
f601cdf3 | 5252 | XFLOAT_INIT (new, num); |
7146af97 JB |
5253 | return new; |
5254 | } | |
5255 | ||
34400008 GM |
5256 | |
5257 | /* Return a vector with room for LEN Lisp_Objects allocated from | |
5258 | pure space. */ | |
5259 | ||
72cb32cf | 5260 | static Lisp_Object |
d311d28c | 5261 | make_pure_vector (ptrdiff_t len) |
7146af97 | 5262 | { |
1f0b3fd2 | 5263 | Lisp_Object new; |
d06714cb | 5264 | size_t size = header_size + len * word_size; |
98c6f1e3 | 5265 | struct Lisp_Vector *p = pure_alloc (size, Lisp_Vectorlike); |
1f0b3fd2 | 5266 | XSETVECTOR (new, p); |
eab3844f | 5267 | XVECTOR (new)->header.size = len; |
7146af97 JB |
5268 | return new; |
5269 | } | |
5270 | ||
34400008 | 5271 | |
a7ca3326 | 5272 | DEFUN ("purecopy", Fpurecopy, Spurecopy, 1, 1, 0, |
909e3b33 | 5273 | doc: /* Make a copy of object OBJ in pure storage. |
228299fa | 5274 | Recursively copies contents of vectors and cons cells. |
7ee72033 | 5275 | Does not copy symbols. Copies strings without text properties. */) |
5842a27b | 5276 | (register Lisp_Object obj) |
7146af97 | 5277 | { |
265a9e55 | 5278 | if (NILP (Vpurify_flag)) |
7146af97 | 5279 | return obj; |
e3b83880 SM |
5280 | else if (MARKERP (obj) || OVERLAYP (obj) |
5281 | || HASH_TABLE_P (obj) || SYMBOLP (obj)) | |
5282 | /* Can't purify those. */ | |
7146af97 | 5283 | return obj; |
e3b83880 SM |
5284 | else |
5285 | return purecopy (obj); | |
5286 | } | |
5287 | ||
5288 | static Lisp_Object | |
5289 | purecopy (Lisp_Object obj) | |
5290 | { | |
5291 | if (PURE_POINTER_P (XPNTR (obj)) || INTEGERP (obj) || SUBRP (obj)) | |
5292 | return obj; /* Already pure. */ | |
7146af97 | 5293 | |
e9515805 SM |
5294 | if (HASH_TABLE_P (Vpurify_flag)) /* Hash consing. */ |
5295 | { | |
5296 | Lisp_Object tmp = Fgethash (obj, Vpurify_flag, Qnil); | |
5297 | if (!NILP (tmp)) | |
5298 | return tmp; | |
5299 | } | |
5300 | ||
d6dd74bb | 5301 | if (CONSP (obj)) |
e9515805 | 5302 | obj = pure_cons (XCAR (obj), XCDR (obj)); |
d6dd74bb | 5303 | else if (FLOATP (obj)) |
e9515805 | 5304 | obj = make_pure_float (XFLOAT_DATA (obj)); |
d6dd74bb | 5305 | else if (STRINGP (obj)) |
42a5b22f | 5306 | obj = make_pure_string (SSDATA (obj), SCHARS (obj), |
e9515805 SM |
5307 | SBYTES (obj), |
5308 | STRING_MULTIBYTE (obj)); | |
876c194c | 5309 | else if (COMPILEDP (obj) || VECTORP (obj)) |
d6dd74bb KH |
5310 | { |
5311 | register struct Lisp_Vector *vec; | |
d311d28c PE |
5312 | register ptrdiff_t i; |
5313 | ptrdiff_t size; | |
d6dd74bb | 5314 | |
77b37c05 | 5315 | size = ASIZE (obj); |
7d535c68 KH |
5316 | if (size & PSEUDOVECTOR_FLAG) |
5317 | size &= PSEUDOVECTOR_SIZE_MASK; | |
6b61353c | 5318 | vec = XVECTOR (make_pure_vector (size)); |
d6dd74bb | 5319 | for (i = 0; i < size; i++) |
e3b83880 | 5320 | vec->contents[i] = purecopy (AREF (obj, i)); |
876c194c | 5321 | if (COMPILEDP (obj)) |
985773c9 | 5322 | { |
876c194c SM |
5323 | XSETPVECTYPE (vec, PVEC_COMPILED); |
5324 | XSETCOMPILED (obj, vec); | |
985773c9 | 5325 | } |
d6dd74bb KH |
5326 | else |
5327 | XSETVECTOR (obj, vec); | |
7146af97 | 5328 | } |
e3b83880 SM |
5329 | else if (SYMBOLP (obj)) |
5330 | { | |
5331 | if (!XSYMBOL (obj)->pinned) | |
5332 | { /* We can't purify them, but they appear in many pure objects. | |
5333 | Mark them as `pinned' so we know to mark them at every GC cycle. */ | |
5334 | XSYMBOL (obj)->pinned = true; | |
5335 | symbol_block_pinned = symbol_block; | |
5336 | } | |
5337 | return obj; | |
5338 | } | |
e9515805 | 5339 | else |
e3b83880 SM |
5340 | { |
5341 | Lisp_Object args[2]; | |
5342 | args[0] = build_pure_c_string ("Don't know how to purify: %S"); | |
5343 | args[1] = obj; | |
5344 | Fsignal (Qerror, (Fcons (Fformat (2, args), Qnil))); | |
5345 | } | |
e9515805 SM |
5346 | |
5347 | if (HASH_TABLE_P (Vpurify_flag)) /* Hash consing. */ | |
5348 | Fputhash (obj, obj, Vpurify_flag); | |
6bbd7a29 GM |
5349 | |
5350 | return obj; | |
7146af97 | 5351 | } |
2e471eb5 | 5352 | |
34400008 | 5353 | |
7146af97 | 5354 | \f |
34400008 GM |
5355 | /*********************************************************************** |
5356 | Protection from GC | |
5357 | ***********************************************************************/ | |
5358 | ||
2e471eb5 GM |
5359 | /* Put an entry in staticvec, pointing at the variable with address |
5360 | VARADDRESS. */ | |
7146af97 JB |
5361 | |
5362 | void | |
971de7fb | 5363 | staticpro (Lisp_Object *varaddress) |
7146af97 | 5364 | { |
7146af97 | 5365 | if (staticidx >= NSTATICS) |
afb8aa24 | 5366 | fatal ("NSTATICS too small; try increasing and recompiling Emacs."); |
4195afc3 | 5367 | staticvec[staticidx++] = varaddress; |
7146af97 JB |
5368 | } |
5369 | ||
7146af97 | 5370 | \f |
34400008 GM |
5371 | /*********************************************************************** |
5372 | Protection from GC | |
5373 | ***********************************************************************/ | |
1a4f1e2c | 5374 | |
e8197642 RS |
5375 | /* Temporarily prevent garbage collection. */ |
5376 | ||
d311d28c | 5377 | ptrdiff_t |
971de7fb | 5378 | inhibit_garbage_collection (void) |
e8197642 | 5379 | { |
d311d28c | 5380 | ptrdiff_t count = SPECPDL_INDEX (); |
54defd0d | 5381 | |
6349ae4d | 5382 | specbind (Qgc_cons_threshold, make_number (MOST_POSITIVE_FIXNUM)); |
e8197642 RS |
5383 | return count; |
5384 | } | |
5385 | ||
3ab6e069 DA |
5386 | /* Used to avoid possible overflows when |
5387 | converting from C to Lisp integers. */ | |
5388 | ||
b0ab8123 | 5389 | static Lisp_Object |
3ab6e069 DA |
5390 | bounded_number (EMACS_INT number) |
5391 | { | |
5392 | return make_number (min (MOST_POSITIVE_FIXNUM, number)); | |
5393 | } | |
34400008 | 5394 | |
12b3895d TM |
5395 | /* Calculate total bytes of live objects. */ |
5396 | ||
5397 | static size_t | |
5398 | total_bytes_of_live_objects (void) | |
5399 | { | |
5400 | size_t tot = 0; | |
5401 | tot += total_conses * sizeof (struct Lisp_Cons); | |
5402 | tot += total_symbols * sizeof (struct Lisp_Symbol); | |
5403 | tot += total_markers * sizeof (union Lisp_Misc); | |
5404 | tot += total_string_bytes; | |
5405 | tot += total_vector_slots * word_size; | |
5406 | tot += total_floats * sizeof (struct Lisp_Float); | |
5407 | tot += total_intervals * sizeof (struct interval); | |
5408 | tot += total_strings * sizeof (struct Lisp_String); | |
5409 | return tot; | |
5410 | } | |
5411 | ||
fc54bdd5 DA |
5412 | #ifdef HAVE_WINDOW_SYSTEM |
5413 | ||
5ae356d9 DA |
5414 | /* This code has a few issues on MS-Windows, see Bug#15876 and Bug#16140. */ |
5415 | ||
5416 | #if !defined (HAVE_NTGUI) | |
5417 | ||
fc54bdd5 DA |
5418 | /* Remove unmarked font-spec and font-entity objects from ENTRY, which is |
5419 | (DRIVER-TYPE NUM-FRAMES FONT-CACHE-DATA ...), and return changed entry. */ | |
5420 | ||
5421 | static Lisp_Object | |
5422 | compact_font_cache_entry (Lisp_Object entry) | |
5423 | { | |
5424 | Lisp_Object tail, *prev = &entry; | |
5425 | ||
5426 | for (tail = entry; CONSP (tail); tail = XCDR (tail)) | |
5427 | { | |
5428 | bool drop = 0; | |
5429 | Lisp_Object obj = XCAR (tail); | |
5430 | ||
5431 | /* Consider OBJ if it is (font-spec . [font-entity font-entity ...]). */ | |
5432 | if (CONSP (obj) && FONT_SPEC_P (XCAR (obj)) | |
5433 | && !VECTOR_MARKED_P (XFONT_SPEC (XCAR (obj))) | |
5434 | && VECTORP (XCDR (obj))) | |
5435 | { | |
5436 | ptrdiff_t i, size = ASIZE (XCDR (obj)) & ~ARRAY_MARK_FLAG; | |
5437 | ||
5438 | /* If font-spec is not marked, most likely all font-entities | |
5439 | are not marked too. But we must be sure that nothing is | |
5440 | marked within OBJ before we really drop it. */ | |
5441 | for (i = 0; i < size; i++) | |
5442 | if (VECTOR_MARKED_P (XFONT_ENTITY (AREF (XCDR (obj), i)))) | |
5443 | break; | |
5444 | ||
5445 | if (i == size) | |
5446 | drop = 1; | |
5447 | } | |
5448 | if (drop) | |
5449 | *prev = XCDR (tail); | |
5450 | else | |
5451 | prev = xcdr_addr (tail); | |
5452 | } | |
5453 | return entry; | |
5454 | } | |
5455 | ||
5ae356d9 DA |
5456 | #endif /* not HAVE_NTGUI */ |
5457 | ||
fc54bdd5 DA |
5458 | /* Compact font caches on all terminals and mark |
5459 | everything which is still here after compaction. */ | |
5460 | ||
5461 | static void | |
5462 | compact_font_caches (void) | |
5463 | { | |
5464 | struct terminal *t; | |
5465 | ||
5466 | for (t = terminal_list; t; t = t->next_terminal) | |
5467 | { | |
5468 | Lisp_Object cache = TERMINAL_FONT_CACHE (t); | |
5ae356d9 | 5469 | #if !defined (HAVE_NTGUI) |
fc54bdd5 DA |
5470 | if (CONSP (cache)) |
5471 | { | |
5472 | Lisp_Object entry; | |
5473 | ||
5474 | for (entry = XCDR (cache); CONSP (entry); entry = XCDR (entry)) | |
5475 | XSETCAR (entry, compact_font_cache_entry (XCAR (entry))); | |
5476 | } | |
5ae356d9 | 5477 | #endif /* not HAVE_NTGUI */ |
fc54bdd5 DA |
5478 | mark_object (cache); |
5479 | } | |
5480 | } | |
5481 | ||
5482 | #else /* not HAVE_WINDOW_SYSTEM */ | |
5483 | ||
5484 | #define compact_font_caches() (void)(0) | |
5485 | ||
5486 | #endif /* HAVE_WINDOW_SYSTEM */ | |
5487 | ||
5488 | /* Remove (MARKER . DATA) entries with unmarked MARKER | |
5489 | from buffer undo LIST and return changed list. */ | |
5490 | ||
5491 | static Lisp_Object | |
5492 | compact_undo_list (Lisp_Object list) | |
5493 | { | |
5494 | Lisp_Object tail, *prev = &list; | |
5495 | ||
5496 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
5497 | { | |
5498 | if (CONSP (XCAR (tail)) | |
5499 | && MARKERP (XCAR (XCAR (tail))) | |
5500 | && !XMARKER (XCAR (XCAR (tail)))->gcmarkbit) | |
5501 | *prev = XCDR (tail); | |
5502 | else | |
5503 | prev = xcdr_addr (tail); | |
5504 | } | |
5505 | return list; | |
5506 | } | |
5507 | ||
e3b83880 SM |
5508 | static void |
5509 | mark_pinned_symbols (void) | |
5510 | { | |
5511 | struct symbol_block *sblk; | |
5512 | int lim = (symbol_block_pinned == symbol_block | |
5513 | ? symbol_block_index : SYMBOL_BLOCK_SIZE); | |
5514 | ||
5515 | for (sblk = symbol_block_pinned; sblk; sblk = sblk->next) | |
5516 | { | |
5517 | union aligned_Lisp_Symbol *sym = sblk->symbols, *end = sym + lim; | |
5518 | for (; sym < end; ++sym) | |
5519 | if (sym->s.pinned) | |
5520 | mark_object (make_lisp_ptr (&sym->s, Lisp_Symbol)); | |
5521 | ||
5522 | lim = SYMBOL_BLOCK_SIZE; | |
5523 | } | |
5524 | } | |
5525 | ||
c94e3311 EZ |
5526 | /* Subroutine of Fgarbage_collect that does most of the work. It is a |
5527 | separate function so that we could limit mark_stack in searching | |
5528 | the stack frames below this function, thus avoiding the rare cases | |
5529 | where mark_stack finds values that look like live Lisp objects on | |
5530 | portions of stack that couldn't possibly contain such live objects. | |
5531 | For more details of this, see the discussion at | |
5532 | http://lists.gnu.org/archive/html/emacs-devel/2014-05/msg00270.html. */ | |
5533 | static Lisp_Object | |
5534 | garbage_collect_1 (void *end) | |
7146af97 | 5535 | { |
fce31d69 | 5536 | struct buffer *nextb; |
7146af97 | 5537 | char stack_top_variable; |
f66c7cf8 | 5538 | ptrdiff_t i; |
fce31d69 | 5539 | bool message_p; |
d311d28c | 5540 | ptrdiff_t count = SPECPDL_INDEX (); |
43aac990 | 5541 | struct timespec start; |
fecbd8ff | 5542 | Lisp_Object retval = Qnil; |
12b3895d | 5543 | size_t tot_before = 0; |
2c5bd608 | 5544 | |
3de0effb | 5545 | if (abort_on_gc) |
1088b922 | 5546 | emacs_abort (); |
3de0effb | 5547 | |
9e713715 GM |
5548 | /* Can't GC if pure storage overflowed because we can't determine |
5549 | if something is a pure object or not. */ | |
5550 | if (pure_bytes_used_before_overflow) | |
5551 | return Qnil; | |
5552 | ||
3d80c99f | 5553 | /* Record this function, so it appears on the profiler's backtraces. */ |
2f592f95 | 5554 | record_in_backtrace (Qautomatic_gc, &Qnil, 0); |
3d80c99f | 5555 | |
7e63e0c3 | 5556 | check_cons_list (); |
bbc012e0 | 5557 | |
3c7e66a8 RS |
5558 | /* Don't keep undo information around forever. |
5559 | Do this early on, so it is no problem if the user quits. */ | |
52b852c7 | 5560 | FOR_EACH_BUFFER (nextb) |
9cd47b72 | 5561 | compact_buffer (nextb); |
3c7e66a8 | 5562 | |
6521894d | 5563 | if (profiler_memory_running) |
12b3895d TM |
5564 | tot_before = total_bytes_of_live_objects (); |
5565 | ||
43aac990 | 5566 | start = current_timespec (); |
3c7e66a8 | 5567 | |
58595309 KH |
5568 | /* In case user calls debug_print during GC, |
5569 | don't let that cause a recursive GC. */ | |
5570 | consing_since_gc = 0; | |
5571 | ||
6efc7df7 GM |
5572 | /* Save what's currently displayed in the echo area. */ |
5573 | message_p = push_message (); | |
27e498e6 | 5574 | record_unwind_protect_void (pop_message_unwind); |
41c28a37 | 5575 | |
7146af97 JB |
5576 | /* Save a copy of the contents of the stack, for debugging. */ |
5577 | #if MAX_SAVE_STACK > 0 | |
265a9e55 | 5578 | if (NILP (Vpurify_flag)) |
7146af97 | 5579 | { |
dd3f25f7 | 5580 | char *stack; |
903fe15d | 5581 | ptrdiff_t stack_size; |
dd3f25f7 | 5582 | if (&stack_top_variable < stack_bottom) |
7146af97 | 5583 | { |
dd3f25f7 PE |
5584 | stack = &stack_top_variable; |
5585 | stack_size = stack_bottom - &stack_top_variable; | |
5586 | } | |
5587 | else | |
5588 | { | |
5589 | stack = stack_bottom; | |
5590 | stack_size = &stack_top_variable - stack_bottom; | |
5591 | } | |
5592 | if (stack_size <= MAX_SAVE_STACK) | |
7146af97 | 5593 | { |
dd3f25f7 | 5594 | if (stack_copy_size < stack_size) |
7146af97 | 5595 | { |
38182d90 | 5596 | stack_copy = xrealloc (stack_copy, stack_size); |
dd3f25f7 | 5597 | stack_copy_size = stack_size; |
7146af97 | 5598 | } |
e76119d7 | 5599 | no_sanitize_memcpy (stack_copy, stack, stack_size); |
7146af97 JB |
5600 | } |
5601 | } | |
5602 | #endif /* MAX_SAVE_STACK > 0 */ | |
5603 | ||
299585ee | 5604 | if (garbage_collection_messages) |
691c4285 | 5605 | message1_nolog ("Garbage collecting..."); |
7146af97 | 5606 | |
4d7e6e51 | 5607 | block_input (); |
6e0fca1d | 5608 | |
eec7b73d RS |
5609 | shrink_regexp_cache (); |
5610 | ||
7146af97 JB |
5611 | gc_in_progress = 1; |
5612 | ||
005ca5c7 | 5613 | /* Mark all the special slots that serve as the roots of accessibility. */ |
7146af97 | 5614 | |
c752cfa9 DA |
5615 | mark_buffer (&buffer_defaults); |
5616 | mark_buffer (&buffer_local_symbols); | |
5617 | ||
7146af97 | 5618 | for (i = 0; i < staticidx; i++) |
49723c04 | 5619 | mark_object (*staticvec[i]); |
34400008 | 5620 | |
e3b83880 | 5621 | mark_pinned_symbols (); |
2f592f95 | 5622 | mark_specpdl (); |
6ed8eeff | 5623 | mark_terminals (); |
126f9c02 SM |
5624 | mark_kboards (); |
5625 | ||
5626 | #ifdef USE_GTK | |
a411ac43 | 5627 | xg_mark_data (); |
126f9c02 SM |
5628 | #endif |
5629 | ||
34400008 GM |
5630 | #if (GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS \ |
5631 | || GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS) | |
c94e3311 | 5632 | mark_stack (end); |
34400008 | 5633 | #else |
acf5f7d3 SM |
5634 | { |
5635 | register struct gcpro *tail; | |
5636 | for (tail = gcprolist; tail; tail = tail->next) | |
5637 | for (i = 0; i < tail->nvars; i++) | |
005ca5c7 | 5638 | mark_object (tail->var[i]); |
acf5f7d3 | 5639 | } |
3e21b6a7 | 5640 | mark_byte_stack (); |
adf2aa61 | 5641 | #endif |
b286858c | 5642 | { |
b286858c | 5643 | struct handler *handler; |
adf2aa61 SM |
5644 | for (handler = handlerlist; handler; handler = handler->next) |
5645 | { | |
5646 | mark_object (handler->tag_or_ch); | |
5647 | mark_object (handler->val); | |
5648 | } | |
b286858c | 5649 | } |
454d7973 KS |
5650 | #ifdef HAVE_WINDOW_SYSTEM |
5651 | mark_fringe_data (); | |
5652 | #endif | |
5653 | ||
74c35a48 | 5654 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
c94e3311 | 5655 | mark_stack (end); |
74c35a48 SM |
5656 | #endif |
5657 | ||
fc54bdd5 DA |
5658 | /* Everything is now marked, except for the data in font caches |
5659 | and undo lists. They're compacted by removing an items which | |
5660 | aren't reachable otherwise. */ | |
5661 | ||
5662 | compact_font_caches (); | |
5663 | ||
52b852c7 | 5664 | FOR_EACH_BUFFER (nextb) |
d17337e5 | 5665 | { |
fc54bdd5 DA |
5666 | if (!EQ (BVAR (nextb, undo_list), Qt)) |
5667 | bset_undo_list (nextb, compact_undo_list (BVAR (nextb, undo_list))); | |
5668 | /* Now that we have stripped the elements that need not be | |
5669 | in the undo_list any more, we can finally mark the list. */ | |
5670 | mark_object (BVAR (nextb, undo_list)); | |
d17337e5 | 5671 | } |
4c315bda | 5672 | |
7146af97 JB |
5673 | gc_sweep (); |
5674 | ||
5675 | /* Clear the mark bits that we set in certain root slots. */ | |
5676 | ||
033a5fa3 | 5677 | unmark_byte_stack (); |
3ef06d12 SM |
5678 | VECTOR_UNMARK (&buffer_defaults); |
5679 | VECTOR_UNMARK (&buffer_local_symbols); | |
7146af97 | 5680 | |
34400008 GM |
5681 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES && 0 |
5682 | dump_zombies (); | |
5683 | #endif | |
5684 | ||
7e63e0c3 | 5685 | check_cons_list (); |
bbc012e0 | 5686 | |
7146af97 JB |
5687 | gc_in_progress = 0; |
5688 | ||
5c747675 DA |
5689 | unblock_input (); |
5690 | ||
7146af97 | 5691 | consing_since_gc = 0; |
0dd6d66d DA |
5692 | if (gc_cons_threshold < GC_DEFAULT_THRESHOLD / 10) |
5693 | gc_cons_threshold = GC_DEFAULT_THRESHOLD / 10; | |
7146af97 | 5694 | |
c0c5c8ae | 5695 | gc_relative_threshold = 0; |
96f077ad SM |
5696 | if (FLOATP (Vgc_cons_percentage)) |
5697 | { /* Set gc_cons_combined_threshold. */ | |
12b3895d | 5698 | double tot = total_bytes_of_live_objects (); |
ae35e756 | 5699 | |
c0c5c8ae | 5700 | tot *= XFLOAT_DATA (Vgc_cons_percentage); |
7216e43b | 5701 | if (0 < tot) |
c0c5c8ae PE |
5702 | { |
5703 | if (tot < TYPE_MAXIMUM (EMACS_INT)) | |
5704 | gc_relative_threshold = tot; | |
5705 | else | |
5706 | gc_relative_threshold = TYPE_MAXIMUM (EMACS_INT); | |
5707 | } | |
96f077ad SM |
5708 | } |
5709 | ||
299585ee RS |
5710 | if (garbage_collection_messages) |
5711 | { | |
6efc7df7 GM |
5712 | if (message_p || minibuf_level > 0) |
5713 | restore_message (); | |
299585ee RS |
5714 | else |
5715 | message1_nolog ("Garbage collecting...done"); | |
5716 | } | |
7146af97 | 5717 | |
98edb5ff | 5718 | unbind_to (count, Qnil); |
fecbd8ff SM |
5719 | { |
5720 | Lisp_Object total[11]; | |
5721 | int total_size = 10; | |
2e471eb5 | 5722 | |
fecbd8ff SM |
5723 | total[0] = list4 (Qconses, make_number (sizeof (struct Lisp_Cons)), |
5724 | bounded_number (total_conses), | |
5725 | bounded_number (total_free_conses)); | |
3ab6e069 | 5726 | |
fecbd8ff SM |
5727 | total[1] = list4 (Qsymbols, make_number (sizeof (struct Lisp_Symbol)), |
5728 | bounded_number (total_symbols), | |
5729 | bounded_number (total_free_symbols)); | |
3ab6e069 | 5730 | |
fecbd8ff SM |
5731 | total[2] = list4 (Qmiscs, make_number (sizeof (union Lisp_Misc)), |
5732 | bounded_number (total_markers), | |
5733 | bounded_number (total_free_markers)); | |
3ab6e069 | 5734 | |
fecbd8ff SM |
5735 | total[3] = list4 (Qstrings, make_number (sizeof (struct Lisp_String)), |
5736 | bounded_number (total_strings), | |
5737 | bounded_number (total_free_strings)); | |
3ab6e069 | 5738 | |
fecbd8ff SM |
5739 | total[4] = list3 (Qstring_bytes, make_number (1), |
5740 | bounded_number (total_string_bytes)); | |
3ab6e069 | 5741 | |
fbe9e0b9 PE |
5742 | total[5] = list3 (Qvectors, |
5743 | make_number (header_size + sizeof (Lisp_Object)), | |
fecbd8ff | 5744 | bounded_number (total_vectors)); |
5b835e1d | 5745 | |
fecbd8ff SM |
5746 | total[6] = list4 (Qvector_slots, make_number (word_size), |
5747 | bounded_number (total_vector_slots), | |
5748 | bounded_number (total_free_vector_slots)); | |
5b835e1d | 5749 | |
fecbd8ff SM |
5750 | total[7] = list4 (Qfloats, make_number (sizeof (struct Lisp_Float)), |
5751 | bounded_number (total_floats), | |
5752 | bounded_number (total_free_floats)); | |
3ab6e069 | 5753 | |
fecbd8ff SM |
5754 | total[8] = list4 (Qintervals, make_number (sizeof (struct interval)), |
5755 | bounded_number (total_intervals), | |
5756 | bounded_number (total_free_intervals)); | |
3ab6e069 | 5757 | |
fecbd8ff SM |
5758 | total[9] = list3 (Qbuffers, make_number (sizeof (struct buffer)), |
5759 | bounded_number (total_buffers)); | |
2e471eb5 | 5760 | |
f8643a6b | 5761 | #ifdef DOUG_LEA_MALLOC |
fecbd8ff SM |
5762 | total_size++; |
5763 | total[10] = list4 (Qheap, make_number (1024), | |
5764 | bounded_number ((mallinfo ().uordblks + 1023) >> 10), | |
5765 | bounded_number ((mallinfo ().fordblks + 1023) >> 10)); | |
f8643a6b | 5766 | #endif |
fecbd8ff SM |
5767 | retval = Flist (total_size, total); |
5768 | } | |
f8643a6b | 5769 | |
34400008 | 5770 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
7146af97 | 5771 | { |
34400008 | 5772 | /* Compute average percentage of zombies. */ |
fecbd8ff SM |
5773 | double nlive |
5774 | = (total_conses + total_symbols + total_markers + total_strings | |
5775 | + total_vectors + total_floats + total_intervals + total_buffers); | |
34400008 GM |
5776 | |
5777 | avg_live = (avg_live * ngcs + nlive) / (ngcs + 1); | |
5778 | max_live = max (nlive, max_live); | |
5779 | avg_zombies = (avg_zombies * ngcs + nzombies) / (ngcs + 1); | |
5780 | max_zombies = max (nzombies, max_zombies); | |
5781 | ++ngcs; | |
dbcf001c | 5782 | } |
34400008 | 5783 | #endif |
7146af97 | 5784 | |
9e713715 GM |
5785 | if (!NILP (Vpost_gc_hook)) |
5786 | { | |
d311d28c | 5787 | ptrdiff_t gc_count = inhibit_garbage_collection (); |
9e713715 | 5788 | safe_run_hooks (Qpost_gc_hook); |
ae35e756 | 5789 | unbind_to (gc_count, Qnil); |
9e713715 | 5790 | } |
2c5bd608 DL |
5791 | |
5792 | /* Accumulate statistics. */ | |
2c5bd608 | 5793 | if (FLOATP (Vgc_elapsed)) |
387d4d92 | 5794 | { |
43aac990 | 5795 | struct timespec since_start = timespec_sub (current_timespec (), start); |
387d4d92 | 5796 | Vgc_elapsed = make_float (XFLOAT_DATA (Vgc_elapsed) |
43aac990 | 5797 | + timespectod (since_start)); |
387d4d92 | 5798 | } |
d35af63c | 5799 | |
2c5bd608 DL |
5800 | gcs_done++; |
5801 | ||
12b3895d | 5802 | /* Collect profiling data. */ |
6521894d | 5803 | if (profiler_memory_running) |
12b3895d TM |
5804 | { |
5805 | size_t swept = 0; | |
6521894d SM |
5806 | size_t tot_after = total_bytes_of_live_objects (); |
5807 | if (tot_before > tot_after) | |
5808 | swept = tot_before - tot_after; | |
3d80c99f | 5809 | malloc_probe (swept); |
12b3895d TM |
5810 | } |
5811 | ||
fecbd8ff | 5812 | return retval; |
7146af97 | 5813 | } |
34400008 | 5814 | |
c94e3311 EZ |
5815 | DEFUN ("garbage-collect", Fgarbage_collect, Sgarbage_collect, 0, 0, "", |
5816 | doc: /* Reclaim storage for Lisp objects no longer needed. | |
5817 | Garbage collection happens automatically if you cons more than | |
5818 | `gc-cons-threshold' bytes of Lisp data since previous garbage collection. | |
5819 | `garbage-collect' normally returns a list with info on amount of space in use, | |
5820 | where each entry has the form (NAME SIZE USED FREE), where: | |
5821 | - NAME is a symbol describing the kind of objects this entry represents, | |
5822 | - SIZE is the number of bytes used by each one, | |
5823 | - USED is the number of those objects that were found live in the heap, | |
5824 | - FREE is the number of those objects that are not live but that Emacs | |
5825 | keeps around for future allocations (maybe because it does not know how | |
5826 | to return them to the OS). | |
5827 | However, if there was overflow in pure space, `garbage-collect' | |
5828 | returns nil, because real GC can't be done. | |
5829 | See Info node `(elisp)Garbage Collection'. */) | |
5830 | (void) | |
5831 | { | |
5832 | #if (GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS \ | |
5833 | || GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS \ | |
5834 | || GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES) | |
5835 | void *end; | |
5836 | ||
5837 | #ifdef HAVE___BUILTIN_UNWIND_INIT | |
5838 | /* Force callee-saved registers and register windows onto the stack. | |
5839 | This is the preferred method if available, obviating the need for | |
5840 | machine dependent methods. */ | |
5841 | __builtin_unwind_init (); | |
5842 | end = &end; | |
5843 | #else /* not HAVE___BUILTIN_UNWIND_INIT */ | |
5844 | #ifndef GC_SAVE_REGISTERS_ON_STACK | |
5845 | /* jmp_buf may not be aligned enough on darwin-ppc64 */ | |
5846 | union aligned_jmpbuf { | |
5847 | Lisp_Object o; | |
5848 | sys_jmp_buf j; | |
5849 | } j; | |
5850 | volatile bool stack_grows_down_p = (char *) &j > (char *) stack_base; | |
5851 | #endif | |
5852 | /* This trick flushes the register windows so that all the state of | |
5853 | the process is contained in the stack. */ | |
5854 | /* Fixme: Code in the Boehm GC suggests flushing (with `flushrs') is | |
5855 | needed on ia64 too. See mach_dep.c, where it also says inline | |
5856 | assembler doesn't work with relevant proprietary compilers. */ | |
5857 | #ifdef __sparc__ | |
5858 | #if defined (__sparc64__) && defined (__FreeBSD__) | |
5859 | /* FreeBSD does not have a ta 3 handler. */ | |
5860 | asm ("flushw"); | |
5861 | #else | |
5862 | asm ("ta 3"); | |
5863 | #endif | |
5864 | #endif | |
5865 | ||
5866 | /* Save registers that we need to see on the stack. We need to see | |
5867 | registers used to hold register variables and registers used to | |
5868 | pass parameters. */ | |
5869 | #ifdef GC_SAVE_REGISTERS_ON_STACK | |
5870 | GC_SAVE_REGISTERS_ON_STACK (end); | |
5871 | #else /* not GC_SAVE_REGISTERS_ON_STACK */ | |
5872 | ||
5873 | #ifndef GC_SETJMP_WORKS /* If it hasn't been checked yet that | |
5874 | setjmp will definitely work, test it | |
5875 | and print a message with the result | |
5876 | of the test. */ | |
5877 | if (!setjmp_tested_p) | |
5878 | { | |
5879 | setjmp_tested_p = 1; | |
5880 | test_setjmp (); | |
5881 | } | |
5882 | #endif /* GC_SETJMP_WORKS */ | |
5883 | ||
5884 | sys_setjmp (j.j); | |
5885 | end = stack_grows_down_p ? (char *) &j + sizeof j : (char *) &j; | |
5886 | #endif /* not GC_SAVE_REGISTERS_ON_STACK */ | |
5887 | #endif /* not HAVE___BUILTIN_UNWIND_INIT */ | |
c94e3311 | 5888 | return garbage_collect_1 (end); |
609b06a0 DA |
5889 | #elif (GC_MARK_STACK == GC_USE_GCPROS_AS_BEFORE) |
5890 | /* Old GCPROs-based method without stack marking. */ | |
5891 | return garbage_collect_1 (NULL); | |
15684f52 | 5892 | #else |
609b06a0 | 5893 | emacs_abort (); |
15684f52 | 5894 | #endif /* GC_MARK_STACK */ |
c94e3311 | 5895 | } |
41c28a37 | 5896 | |
3770920e GM |
5897 | /* Mark Lisp objects in glyph matrix MATRIX. Currently the |
5898 | only interesting objects referenced from glyphs are strings. */ | |
41c28a37 GM |
5899 | |
5900 | static void | |
971de7fb | 5901 | mark_glyph_matrix (struct glyph_matrix *matrix) |
41c28a37 GM |
5902 | { |
5903 | struct glyph_row *row = matrix->rows; | |
5904 | struct glyph_row *end = row + matrix->nrows; | |
5905 | ||
2e471eb5 GM |
5906 | for (; row < end; ++row) |
5907 | if (row->enabled_p) | |
5908 | { | |
5909 | int area; | |
5910 | for (area = LEFT_MARGIN_AREA; area < LAST_AREA; ++area) | |
5911 | { | |
5912 | struct glyph *glyph = row->glyphs[area]; | |
5913 | struct glyph *end_glyph = glyph + row->used[area]; | |
177c0ea7 | 5914 | |
2e471eb5 | 5915 | for (; glyph < end_glyph; ++glyph) |
8e50cc2d | 5916 | if (STRINGP (glyph->object) |
2e471eb5 | 5917 | && !STRING_MARKED_P (XSTRING (glyph->object))) |
49723c04 | 5918 | mark_object (glyph->object); |
2e471eb5 GM |
5919 | } |
5920 | } | |
41c28a37 GM |
5921 | } |
5922 | ||
1a4f1e2c | 5923 | /* Mark reference to a Lisp_Object. |
2e471eb5 GM |
5924 | If the object referred to has not been seen yet, recursively mark |
5925 | all the references contained in it. */ | |
7146af97 | 5926 | |
785cd37f | 5927 | #define LAST_MARKED_SIZE 500 |
d3d47262 | 5928 | static Lisp_Object last_marked[LAST_MARKED_SIZE]; |
244ed907 | 5929 | static int last_marked_index; |
785cd37f | 5930 | |
1342fc6f RS |
5931 | /* For debugging--call abort when we cdr down this many |
5932 | links of a list, in mark_object. In debugging, | |
5933 | the call to abort will hit a breakpoint. | |
5934 | Normally this is zero and the check never goes off. */ | |
903fe15d | 5935 | ptrdiff_t mark_object_loop_halt EXTERNALLY_VISIBLE; |
1342fc6f | 5936 | |
8f11f7ec | 5937 | static void |
971de7fb | 5938 | mark_vectorlike (struct Lisp_Vector *ptr) |
d2029e5b | 5939 | { |
d311d28c PE |
5940 | ptrdiff_t size = ptr->header.size; |
5941 | ptrdiff_t i; | |
d2029e5b | 5942 | |
8f11f7ec | 5943 | eassert (!VECTOR_MARKED_P (ptr)); |
7555c33f | 5944 | VECTOR_MARK (ptr); /* Else mark it. */ |
d2029e5b SM |
5945 | if (size & PSEUDOVECTOR_FLAG) |
5946 | size &= PSEUDOVECTOR_SIZE_MASK; | |
d3d47262 | 5947 | |
d2029e5b SM |
5948 | /* Note that this size is not the memory-footprint size, but only |
5949 | the number of Lisp_Object fields that we should trace. | |
5950 | The distinction is used e.g. by Lisp_Process which places extra | |
7555c33f SM |
5951 | non-Lisp_Object fields at the end of the structure... */ |
5952 | for (i = 0; i < size; i++) /* ...and then mark its elements. */ | |
91f2d272 | 5953 | mark_object (ptr->contents[i]); |
d2029e5b SM |
5954 | } |
5955 | ||
58026347 KH |
5956 | /* Like mark_vectorlike but optimized for char-tables (and |
5957 | sub-char-tables) assuming that the contents are mostly integers or | |
5958 | symbols. */ | |
5959 | ||
5960 | static void | |
971de7fb | 5961 | mark_char_table (struct Lisp_Vector *ptr) |
58026347 | 5962 | { |
b6439961 PE |
5963 | int size = ptr->header.size & PSEUDOVECTOR_SIZE_MASK; |
5964 | int i; | |
58026347 | 5965 | |
8f11f7ec | 5966 | eassert (!VECTOR_MARKED_P (ptr)); |
58026347 KH |
5967 | VECTOR_MARK (ptr); |
5968 | for (i = 0; i < size; i++) | |
5969 | { | |
91f2d272 | 5970 | Lisp_Object val = ptr->contents[i]; |
58026347 | 5971 | |
ef1b0ba7 | 5972 | if (INTEGERP (val) || (SYMBOLP (val) && XSYMBOL (val)->gcmarkbit)) |
58026347 KH |
5973 | continue; |
5974 | if (SUB_CHAR_TABLE_P (val)) | |
5975 | { | |
5976 | if (! VECTOR_MARKED_P (XVECTOR (val))) | |
5977 | mark_char_table (XVECTOR (val)); | |
5978 | } | |
5979 | else | |
5980 | mark_object (val); | |
5981 | } | |
5982 | } | |
5983 | ||
83f14500 DA |
5984 | NO_INLINE /* To reduce stack depth in mark_object. */ |
5985 | static Lisp_Object | |
5986 | mark_compiled (struct Lisp_Vector *ptr) | |
5987 | { | |
5988 | int i, size = ptr->header.size & PSEUDOVECTOR_SIZE_MASK; | |
15684f52 | 5989 | |
83f14500 DA |
5990 | VECTOR_MARK (ptr); |
5991 | for (i = 0; i < size; i++) | |
5992 | if (i != COMPILED_CONSTANTS) | |
5993 | mark_object (ptr->contents[i]); | |
5994 | return size > COMPILED_CONSTANTS ? ptr->contents[COMPILED_CONSTANTS] : Qnil; | |
5995 | } | |
5996 | ||
36429c89 DA |
5997 | /* Mark the chain of overlays starting at PTR. */ |
5998 | ||
5999 | static void | |
6000 | mark_overlay (struct Lisp_Overlay *ptr) | |
6001 | { | |
6002 | for (; ptr && !ptr->gcmarkbit; ptr = ptr->next) | |
6003 | { | |
6004 | ptr->gcmarkbit = 1; | |
c644523b DA |
6005 | mark_object (ptr->start); |
6006 | mark_object (ptr->end); | |
6007 | mark_object (ptr->plist); | |
36429c89 DA |
6008 | } |
6009 | } | |
6010 | ||
6011 | /* Mark Lisp_Objects and special pointers in BUFFER. */ | |
cf5c0175 DA |
6012 | |
6013 | static void | |
6014 | mark_buffer (struct buffer *buffer) | |
6015 | { | |
b4fa72f2 DA |
6016 | /* This is handled much like other pseudovectors... */ |
6017 | mark_vectorlike ((struct Lisp_Vector *) buffer); | |
cf5c0175 | 6018 | |
b4fa72f2 | 6019 | /* ...but there are some buffer-specific things. */ |
cf5c0175 | 6020 | |
b4fa72f2 | 6021 | MARK_INTERVAL_TREE (buffer_intervals (buffer)); |
cf5c0175 | 6022 | |
b4fa72f2 DA |
6023 | /* For now, we just don't mark the undo_list. It's done later in |
6024 | a special way just before the sweep phase, and after stripping | |
6025 | some of its elements that are not needed any more. */ | |
cf5c0175 | 6026 | |
b4fa72f2 DA |
6027 | mark_overlay (buffer->overlays_before); |
6028 | mark_overlay (buffer->overlays_after); | |
cf5c0175 | 6029 | |
b4fa72f2 DA |
6030 | /* If this is an indirect buffer, mark its base buffer. */ |
6031 | if (buffer->base_buffer && !VECTOR_MARKED_P (buffer->base_buffer)) | |
6032 | mark_buffer (buffer->base_buffer); | |
cf5c0175 DA |
6033 | } |
6034 | ||
fc54bdd5 DA |
6035 | /* Mark Lisp faces in the face cache C. */ |
6036 | ||
83f14500 | 6037 | NO_INLINE /* To reduce stack depth in mark_object. */ |
fc54bdd5 DA |
6038 | static void |
6039 | mark_face_cache (struct face_cache *c) | |
6040 | { | |
6041 | if (c) | |
6042 | { | |
6043 | int i, j; | |
6044 | for (i = 0; i < c->used; ++i) | |
6045 | { | |
6046 | struct face *face = FACE_FROM_ID (c->f, i); | |
6047 | ||
6048 | if (face) | |
6049 | { | |
6050 | if (face->font && !VECTOR_MARKED_P (face->font)) | |
6051 | mark_vectorlike ((struct Lisp_Vector *) face->font); | |
6052 | ||
6053 | for (j = 0; j < LFACE_VECTOR_SIZE; ++j) | |
6054 | mark_object (face->lface[j]); | |
6055 | } | |
6056 | } | |
6057 | } | |
6058 | } | |
6059 | ||
83f14500 DA |
6060 | NO_INLINE /* To reduce stack depth in mark_object. */ |
6061 | static void | |
6062 | mark_localized_symbol (struct Lisp_Symbol *ptr) | |
6063 | { | |
6064 | struct Lisp_Buffer_Local_Value *blv = SYMBOL_BLV (ptr); | |
6065 | Lisp_Object where = blv->where; | |
6066 | /* If the value is set up for a killed buffer or deleted | |
15684f52 | 6067 | frame, restore its global binding. If the value is |
83f14500 DA |
6068 | forwarded to a C variable, either it's not a Lisp_Object |
6069 | var, or it's staticpro'd already. */ | |
6070 | if ((BUFFERP (where) && !BUFFER_LIVE_P (XBUFFER (where))) | |
6071 | || (FRAMEP (where) && !FRAME_LIVE_P (XFRAME (where)))) | |
6072 | swap_in_global_binding (ptr); | |
6073 | mark_object (blv->where); | |
6074 | mark_object (blv->valcell); | |
6075 | mark_object (blv->defcell); | |
6076 | } | |
6077 | ||
2c70e6b0 DA |
6078 | NO_INLINE /* To reduce stack depth in mark_object. */ |
6079 | static void | |
6080 | mark_save_value (struct Lisp_Save_Value *ptr) | |
6081 | { | |
6082 | /* If `save_type' is zero, `data[0].pointer' is the address | |
6083 | of a memory area containing `data[1].integer' potential | |
6084 | Lisp_Objects. */ | |
6085 | if (GC_MARK_STACK && ptr->save_type == SAVE_TYPE_MEMORY) | |
6086 | { | |
6087 | Lisp_Object *p = ptr->data[0].pointer; | |
6088 | ptrdiff_t nelt; | |
6089 | for (nelt = ptr->data[1].integer; nelt > 0; nelt--, p++) | |
6090 | mark_maybe_object (*p); | |
6091 | } | |
6092 | else | |
6093 | { | |
6094 | /* Find Lisp_Objects in `data[N]' slots and mark them. */ | |
6095 | int i; | |
6096 | for (i = 0; i < SAVE_VALUE_SLOTS; i++) | |
6097 | if (save_type (ptr, i) == SAVE_OBJECT) | |
6098 | mark_object (ptr->data[i].object); | |
6099 | } | |
6100 | } | |
6101 | ||
d59a1afb | 6102 | /* Remove killed buffers or items whose car is a killed buffer from |
e99f70c8 | 6103 | LIST, and mark other items. Return changed LIST, which is marked. */ |
d73e321c | 6104 | |
5779a1dc | 6105 | static Lisp_Object |
d59a1afb | 6106 | mark_discard_killed_buffers (Lisp_Object list) |
d73e321c | 6107 | { |
d59a1afb | 6108 | Lisp_Object tail, *prev = &list; |
d73e321c | 6109 | |
d59a1afb DA |
6110 | for (tail = list; CONSP (tail) && !CONS_MARKED_P (XCONS (tail)); |
6111 | tail = XCDR (tail)) | |
d73e321c | 6112 | { |
5779a1dc | 6113 | Lisp_Object tem = XCAR (tail); |
d73e321c DA |
6114 | if (CONSP (tem)) |
6115 | tem = XCAR (tem); | |
6116 | if (BUFFERP (tem) && !BUFFER_LIVE_P (XBUFFER (tem))) | |
5779a1dc | 6117 | *prev = XCDR (tail); |
d73e321c | 6118 | else |
d59a1afb DA |
6119 | { |
6120 | CONS_MARK (XCONS (tail)); | |
6121 | mark_object (XCAR (tail)); | |
84575e67 | 6122 | prev = xcdr_addr (tail); |
d59a1afb | 6123 | } |
d73e321c | 6124 | } |
e99f70c8 | 6125 | mark_object (tail); |
d73e321c DA |
6126 | return list; |
6127 | } | |
6128 | ||
2c70e6b0 DA |
6129 | /* Determine type of generic Lisp_Object and mark it accordingly. |
6130 | ||
6131 | This function implements a straightforward depth-first marking | |
6132 | algorithm and so the recursion depth may be very high (a few | |
6133 | tens of thousands is not uncommon). To minimize stack usage, | |
6134 | a few cold paths are moved out to NO_INLINE functions above. | |
6135 | In general, inlining them doesn't help you to gain more speed. */ | |
cf5c0175 | 6136 | |
41c28a37 | 6137 | void |
971de7fb | 6138 | mark_object (Lisp_Object arg) |
7146af97 | 6139 | { |
49723c04 | 6140 | register Lisp_Object obj = arg; |
4f5c1376 GM |
6141 | #ifdef GC_CHECK_MARKED_OBJECTS |
6142 | void *po; | |
6143 | struct mem_node *m; | |
6144 | #endif | |
903fe15d | 6145 | ptrdiff_t cdr_count = 0; |
7146af97 | 6146 | |
9149e743 | 6147 | loop: |
7146af97 | 6148 | |
1f0b3fd2 | 6149 | if (PURE_POINTER_P (XPNTR (obj))) |
7146af97 JB |
6150 | return; |
6151 | ||
49723c04 | 6152 | last_marked[last_marked_index++] = obj; |
785cd37f RS |
6153 | if (last_marked_index == LAST_MARKED_SIZE) |
6154 | last_marked_index = 0; | |
6155 | ||
4f5c1376 GM |
6156 | /* Perform some sanity checks on the objects marked here. Abort if |
6157 | we encounter an object we know is bogus. This increases GC time | |
6158 | by ~80%, and requires compilation with GC_MARK_STACK != 0. */ | |
6159 | #ifdef GC_CHECK_MARKED_OBJECTS | |
6160 | ||
6161 | po = (void *) XPNTR (obj); | |
6162 | ||
6163 | /* Check that the object pointed to by PO is known to be a Lisp | |
6164 | structure allocated from the heap. */ | |
6165 | #define CHECK_ALLOCATED() \ | |
6166 | do { \ | |
6167 | m = mem_find (po); \ | |
6168 | if (m == MEM_NIL) \ | |
1088b922 | 6169 | emacs_abort (); \ |
4f5c1376 GM |
6170 | } while (0) |
6171 | ||
6172 | /* Check that the object pointed to by PO is live, using predicate | |
6173 | function LIVEP. */ | |
6174 | #define CHECK_LIVE(LIVEP) \ | |
6175 | do { \ | |
6176 | if (!LIVEP (m, po)) \ | |
1088b922 | 6177 | emacs_abort (); \ |
4f5c1376 GM |
6178 | } while (0) |
6179 | ||
6180 | /* Check both of the above conditions. */ | |
6181 | #define CHECK_ALLOCATED_AND_LIVE(LIVEP) \ | |
6182 | do { \ | |
6183 | CHECK_ALLOCATED (); \ | |
6184 | CHECK_LIVE (LIVEP); \ | |
6185 | } while (0) \ | |
177c0ea7 | 6186 | |
4f5c1376 | 6187 | #else /* not GC_CHECK_MARKED_OBJECTS */ |
177c0ea7 | 6188 | |
4f5c1376 GM |
6189 | #define CHECK_LIVE(LIVEP) (void) 0 |
6190 | #define CHECK_ALLOCATED_AND_LIVE(LIVEP) (void) 0 | |
177c0ea7 | 6191 | |
4f5c1376 GM |
6192 | #endif /* not GC_CHECK_MARKED_OBJECTS */ |
6193 | ||
7393bcbb | 6194 | switch (XTYPE (obj)) |
7146af97 JB |
6195 | { |
6196 | case Lisp_String: | |
6197 | { | |
6198 | register struct Lisp_String *ptr = XSTRING (obj); | |
8f11f7ec SM |
6199 | if (STRING_MARKED_P (ptr)) |
6200 | break; | |
4f5c1376 | 6201 | CHECK_ALLOCATED_AND_LIVE (live_string_p); |
2e471eb5 | 6202 | MARK_STRING (ptr); |
7555c33f | 6203 | MARK_INTERVAL_TREE (ptr->intervals); |
361b097f | 6204 | #ifdef GC_CHECK_STRING_BYTES |
676a7251 | 6205 | /* Check that the string size recorded in the string is the |
7555c33f | 6206 | same as the one recorded in the sdata structure. */ |
e499d0ee | 6207 | string_bytes (ptr); |
361b097f | 6208 | #endif /* GC_CHECK_STRING_BYTES */ |
7146af97 JB |
6209 | } |
6210 | break; | |
6211 | ||
76437631 | 6212 | case Lisp_Vectorlike: |
cf5c0175 DA |
6213 | { |
6214 | register struct Lisp_Vector *ptr = XVECTOR (obj); | |
6215 | register ptrdiff_t pvectype; | |
6216 | ||
6217 | if (VECTOR_MARKED_P (ptr)) | |
6218 | break; | |
6219 | ||
4f5c1376 | 6220 | #ifdef GC_CHECK_MARKED_OBJECTS |
cf5c0175 | 6221 | m = mem_find (po); |
c752cfa9 | 6222 | if (m == MEM_NIL && !SUBRP (obj)) |
1088b922 | 6223 | emacs_abort (); |
4f5c1376 | 6224 | #endif /* GC_CHECK_MARKED_OBJECTS */ |
177c0ea7 | 6225 | |
cf5c0175 | 6226 | if (ptr->header.size & PSEUDOVECTOR_FLAG) |
ee28be33 | 6227 | pvectype = ((ptr->header.size & PVEC_TYPE_MASK) |
914adc42 | 6228 | >> PSEUDOVECTOR_AREA_BITS); |
cf5c0175 | 6229 | else |
6aea7528 | 6230 | pvectype = PVEC_NORMAL_VECTOR; |
cf5c0175 | 6231 | |
cf5c0175 DA |
6232 | if (pvectype != PVEC_SUBR && pvectype != PVEC_BUFFER) |
6233 | CHECK_LIVE (live_vector_p); | |
169ee243 | 6234 | |
ee28be33 | 6235 | switch (pvectype) |
cf5c0175 | 6236 | { |
ee28be33 | 6237 | case PVEC_BUFFER: |
cf5c0175 | 6238 | #ifdef GC_CHECK_MARKED_OBJECTS |
c752cfa9 DA |
6239 | { |
6240 | struct buffer *b; | |
6241 | FOR_EACH_BUFFER (b) | |
6242 | if (b == po) | |
6243 | break; | |
6244 | if (b == NULL) | |
6245 | emacs_abort (); | |
6246 | } | |
cf5c0175 DA |
6247 | #endif /* GC_CHECK_MARKED_OBJECTS */ |
6248 | mark_buffer ((struct buffer *) ptr); | |
ee28be33 SM |
6249 | break; |
6250 | ||
6251 | case PVEC_COMPILED: | |
83f14500 DA |
6252 | /* Although we could treat this just like a vector, mark_compiled |
6253 | returns the COMPILED_CONSTANTS element, which is marked at the | |
6254 | next iteration of goto-loop here. This is done to avoid a few | |
6255 | recursive calls to mark_object. */ | |
6256 | obj = mark_compiled (ptr); | |
6257 | if (!NILP (obj)) | |
6258 | goto loop; | |
ee28be33 | 6259 | break; |
cf5c0175 | 6260 | |
ee28be33 | 6261 | case PVEC_FRAME: |
df24a230 DA |
6262 | { |
6263 | struct frame *f = (struct frame *) ptr; | |
6264 | ||
6265 | mark_vectorlike (ptr); | |
6266 | mark_face_cache (f->face_cache); | |
6267 | #ifdef HAVE_WINDOW_SYSTEM | |
6268 | if (FRAME_WINDOW_P (f) && FRAME_X_OUTPUT (f)) | |
6269 | { | |
6270 | struct font *font = FRAME_FONT (f); | |
6271 | ||
6272 | if (font && !VECTOR_MARKED_P (font)) | |
6273 | mark_vectorlike ((struct Lisp_Vector *) font); | |
6274 | } | |
6275 | #endif | |
6276 | } | |
ee28be33 | 6277 | break; |
cf5c0175 | 6278 | |
ee28be33 SM |
6279 | case PVEC_WINDOW: |
6280 | { | |
6281 | struct window *w = (struct window *) ptr; | |
5779a1dc | 6282 | |
0699fc18 | 6283 | mark_vectorlike (ptr); |
e99f70c8 | 6284 | |
e74aeda8 | 6285 | /* Mark glyph matrices, if any. Marking window |
0699fc18 DA |
6286 | matrices is sufficient because frame matrices |
6287 | use the same glyph memory. */ | |
e74aeda8 | 6288 | if (w->current_matrix) |
ee28be33 | 6289 | { |
0699fc18 DA |
6290 | mark_glyph_matrix (w->current_matrix); |
6291 | mark_glyph_matrix (w->desired_matrix); | |
ee28be33 | 6292 | } |
e99f70c8 SM |
6293 | |
6294 | /* Filter out killed buffers from both buffer lists | |
6295 | in attempt to help GC to reclaim killed buffers faster. | |
6296 | We can do it elsewhere for live windows, but this is the | |
6297 | best place to do it for dead windows. */ | |
6298 | wset_prev_buffers | |
6299 | (w, mark_discard_killed_buffers (w->prev_buffers)); | |
6300 | wset_next_buffers | |
6301 | (w, mark_discard_killed_buffers (w->next_buffers)); | |
ee28be33 SM |
6302 | } |
6303 | break; | |
cf5c0175 | 6304 | |
ee28be33 SM |
6305 | case PVEC_HASH_TABLE: |
6306 | { | |
6307 | struct Lisp_Hash_Table *h = (struct Lisp_Hash_Table *) ptr; | |
cf5c0175 | 6308 | |
ee28be33 | 6309 | mark_vectorlike (ptr); |
b7432bb2 SM |
6310 | mark_object (h->test.name); |
6311 | mark_object (h->test.user_hash_function); | |
6312 | mark_object (h->test.user_cmp_function); | |
ee28be33 SM |
6313 | /* If hash table is not weak, mark all keys and values. |
6314 | For weak tables, mark only the vector. */ | |
6315 | if (NILP (h->weak)) | |
6316 | mark_object (h->key_and_value); | |
6317 | else | |
6318 | VECTOR_MARK (XVECTOR (h->key_and_value)); | |
6319 | } | |
6320 | break; | |
cf5c0175 | 6321 | |
ee28be33 SM |
6322 | case PVEC_CHAR_TABLE: |
6323 | mark_char_table (ptr); | |
6324 | break; | |
cf5c0175 | 6325 | |
ee28be33 SM |
6326 | case PVEC_BOOL_VECTOR: |
6327 | /* No Lisp_Objects to mark in a bool vector. */ | |
6328 | VECTOR_MARK (ptr); | |
6329 | break; | |
cf5c0175 | 6330 | |
ee28be33 SM |
6331 | case PVEC_SUBR: |
6332 | break; | |
cf5c0175 | 6333 | |
ee28be33 | 6334 | case PVEC_FREE: |
1088b922 | 6335 | emacs_abort (); |
cf5c0175 | 6336 | |
ee28be33 SM |
6337 | default: |
6338 | mark_vectorlike (ptr); | |
6339 | } | |
cf5c0175 | 6340 | } |
169ee243 | 6341 | break; |
7146af97 | 6342 | |
7146af97 JB |
6343 | case Lisp_Symbol: |
6344 | { | |
c70bbf06 | 6345 | register struct Lisp_Symbol *ptr = XSYMBOL (obj); |
83f14500 | 6346 | nextsym: |
8f11f7ec SM |
6347 | if (ptr->gcmarkbit) |
6348 | break; | |
4f5c1376 | 6349 | CHECK_ALLOCATED_AND_LIVE (live_symbol_p); |
2336fe58 | 6350 | ptr->gcmarkbit = 1; |
e3f04a4a DC |
6351 | /* Attempt to catch bogus objects. */ |
6352 | eassert (valid_lisp_object_p (ptr->function) >= 1); | |
c644523b DA |
6353 | mark_object (ptr->function); |
6354 | mark_object (ptr->plist); | |
ce5b453a SM |
6355 | switch (ptr->redirect) |
6356 | { | |
6357 | case SYMBOL_PLAINVAL: mark_object (SYMBOL_VAL (ptr)); break; | |
6358 | case SYMBOL_VARALIAS: | |
6359 | { | |
6360 | Lisp_Object tem; | |
6361 | XSETSYMBOL (tem, SYMBOL_ALIAS (ptr)); | |
6362 | mark_object (tem); | |
6363 | break; | |
6364 | } | |
6365 | case SYMBOL_LOCALIZED: | |
83f14500 DA |
6366 | mark_localized_symbol (ptr); |
6367 | break; | |
ce5b453a SM |
6368 | case SYMBOL_FORWARDED: |
6369 | /* If the value is forwarded to a buffer or keyboard field, | |
6370 | these are marked when we see the corresponding object. | |
6371 | And if it's forwarded to a C variable, either it's not | |
6372 | a Lisp_Object var, or it's staticpro'd already. */ | |
6373 | break; | |
1088b922 | 6374 | default: emacs_abort (); |
ce5b453a | 6375 | } |
c644523b DA |
6376 | if (!PURE_POINTER_P (XSTRING (ptr->name))) |
6377 | MARK_STRING (XSTRING (ptr->name)); | |
0c94c8d6 | 6378 | MARK_INTERVAL_TREE (string_intervals (ptr->name)); |
83f14500 | 6379 | /* Inner loop to mark next symbol in this bucket, if any. */ |
7146af97 JB |
6380 | ptr = ptr->next; |
6381 | if (ptr) | |
83f14500 | 6382 | goto nextsym; |
7146af97 JB |
6383 | } |
6384 | break; | |
6385 | ||
a0a38eb7 | 6386 | case Lisp_Misc: |
4f5c1376 | 6387 | CHECK_ALLOCATED_AND_LIVE (live_misc_p); |
b766f870 | 6388 | |
7555c33f SM |
6389 | if (XMISCANY (obj)->gcmarkbit) |
6390 | break; | |
6391 | ||
6392 | switch (XMISCTYPE (obj)) | |
a0a38eb7 | 6393 | { |
7555c33f SM |
6394 | case Lisp_Misc_Marker: |
6395 | /* DO NOT mark thru the marker's chain. | |
6396 | The buffer's markers chain does not preserve markers from gc; | |
6397 | instead, markers are removed from the chain when freed by gc. */ | |
36429c89 | 6398 | XMISCANY (obj)->gcmarkbit = 1; |
7555c33f | 6399 | break; |
465edf35 | 6400 | |
7555c33f SM |
6401 | case Lisp_Misc_Save_Value: |
6402 | XMISCANY (obj)->gcmarkbit = 1; | |
2c70e6b0 | 6403 | mark_save_value (XSAVE_VALUE (obj)); |
7555c33f SM |
6404 | break; |
6405 | ||
6406 | case Lisp_Misc_Overlay: | |
6407 | mark_overlay (XOVERLAY (obj)); | |
6408 | break; | |
6409 | ||
6410 | default: | |
1088b922 | 6411 | emacs_abort (); |
a0a38eb7 | 6412 | } |
7146af97 JB |
6413 | break; |
6414 | ||
6415 | case Lisp_Cons: | |
7146af97 JB |
6416 | { |
6417 | register struct Lisp_Cons *ptr = XCONS (obj); | |
8f11f7ec SM |
6418 | if (CONS_MARKED_P (ptr)) |
6419 | break; | |
4f5c1376 | 6420 | CHECK_ALLOCATED_AND_LIVE (live_cons_p); |
08b7c2cb | 6421 | CONS_MARK (ptr); |
c54ca951 | 6422 | /* If the cdr is nil, avoid recursion for the car. */ |
c644523b | 6423 | if (EQ (ptr->u.cdr, Qnil)) |
c54ca951 | 6424 | { |
c644523b | 6425 | obj = ptr->car; |
1342fc6f | 6426 | cdr_count = 0; |
c54ca951 RS |
6427 | goto loop; |
6428 | } | |
c644523b DA |
6429 | mark_object (ptr->car); |
6430 | obj = ptr->u.cdr; | |
1342fc6f RS |
6431 | cdr_count++; |
6432 | if (cdr_count == mark_object_loop_halt) | |
1088b922 | 6433 | emacs_abort (); |
7146af97 JB |
6434 | goto loop; |
6435 | } | |
6436 | ||
7146af97 | 6437 | case Lisp_Float: |
4f5c1376 | 6438 | CHECK_ALLOCATED_AND_LIVE (live_float_p); |
ab6780cd | 6439 | FLOAT_MARK (XFLOAT (obj)); |
7146af97 | 6440 | break; |
7146af97 | 6441 | |
2de9f71c | 6442 | case_Lisp_Int: |
7146af97 JB |
6443 | break; |
6444 | ||
6445 | default: | |
1088b922 | 6446 | emacs_abort (); |
7146af97 | 6447 | } |
4f5c1376 GM |
6448 | |
6449 | #undef CHECK_LIVE | |
6450 | #undef CHECK_ALLOCATED | |
6451 | #undef CHECK_ALLOCATED_AND_LIVE | |
7146af97 | 6452 | } |
4a729fd8 | 6453 | /* Mark the Lisp pointers in the terminal objects. |
0ba2624f | 6454 | Called by Fgarbage_collect. */ |
4a729fd8 | 6455 | |
4a729fd8 SM |
6456 | static void |
6457 | mark_terminals (void) | |
6458 | { | |
6459 | struct terminal *t; | |
6460 | for (t = terminal_list; t; t = t->next_terminal) | |
6461 | { | |
6462 | eassert (t->name != NULL); | |
354884c4 | 6463 | #ifdef HAVE_WINDOW_SYSTEM |
96ad0af7 YM |
6464 | /* If a terminal object is reachable from a stacpro'ed object, |
6465 | it might have been marked already. Make sure the image cache | |
6466 | gets marked. */ | |
6467 | mark_image_cache (t->image_cache); | |
354884c4 | 6468 | #endif /* HAVE_WINDOW_SYSTEM */ |
96ad0af7 YM |
6469 | if (!VECTOR_MARKED_P (t)) |
6470 | mark_vectorlike ((struct Lisp_Vector *)t); | |
4a729fd8 SM |
6471 | } |
6472 | } | |
6473 | ||
6474 | ||
084b1a0c | 6475 | |
41c28a37 GM |
6476 | /* Value is non-zero if OBJ will survive the current GC because it's |
6477 | either marked or does not need to be marked to survive. */ | |
6478 | ||
fce31d69 | 6479 | bool |
971de7fb | 6480 | survives_gc_p (Lisp_Object obj) |
41c28a37 | 6481 | { |
fce31d69 | 6482 | bool survives_p; |
177c0ea7 | 6483 | |
8e50cc2d | 6484 | switch (XTYPE (obj)) |
41c28a37 | 6485 | { |
2de9f71c | 6486 | case_Lisp_Int: |
41c28a37 GM |
6487 | survives_p = 1; |
6488 | break; | |
6489 | ||
6490 | case Lisp_Symbol: | |
2336fe58 | 6491 | survives_p = XSYMBOL (obj)->gcmarkbit; |
41c28a37 GM |
6492 | break; |
6493 | ||
6494 | case Lisp_Misc: | |
67ee9f6e | 6495 | survives_p = XMISCANY (obj)->gcmarkbit; |
41c28a37 GM |
6496 | break; |
6497 | ||
6498 | case Lisp_String: | |
08b7c2cb | 6499 | survives_p = STRING_MARKED_P (XSTRING (obj)); |
41c28a37 GM |
6500 | break; |
6501 | ||
6502 | case Lisp_Vectorlike: | |
8e50cc2d | 6503 | survives_p = SUBRP (obj) || VECTOR_MARKED_P (XVECTOR (obj)); |
41c28a37 GM |
6504 | break; |
6505 | ||
6506 | case Lisp_Cons: | |
08b7c2cb | 6507 | survives_p = CONS_MARKED_P (XCONS (obj)); |
41c28a37 GM |
6508 | break; |
6509 | ||
41c28a37 | 6510 | case Lisp_Float: |
ab6780cd | 6511 | survives_p = FLOAT_MARKED_P (XFLOAT (obj)); |
41c28a37 | 6512 | break; |
41c28a37 GM |
6513 | |
6514 | default: | |
1088b922 | 6515 | emacs_abort (); |
41c28a37 GM |
6516 | } |
6517 | ||
34400008 | 6518 | return survives_p || PURE_POINTER_P ((void *) XPNTR (obj)); |
41c28a37 GM |
6519 | } |
6520 | ||
6521 | ||
7146af97 | 6522 | \f |
7146af97 | 6523 | |
b029599f | 6524 | NO_INLINE /* For better stack traces */ |
7146af97 | 6525 | static void |
b029599f | 6526 | sweep_conses (void) |
7146af97 | 6527 | { |
9c23779a | 6528 | struct cons_block *cblk; |
b029599f | 6529 | struct cons_block **cprev = &cons_block; |
9c23779a | 6530 | int lim = cons_block_index; |
b029599f | 6531 | EMACS_INT num_free = 0, num_used = 0; |
7146af97 | 6532 | |
b029599f | 6533 | cons_free_list = 0; |
177c0ea7 | 6534 | |
b029599f DC |
6535 | for (cblk = cons_block; cblk; cblk = *cprev) |
6536 | { | |
9c23779a | 6537 | int i = 0; |
b029599f | 6538 | int this_free = 0; |
9c23779a | 6539 | int ilim = (lim + BITS_PER_BITS_WORD - 1) / BITS_PER_BITS_WORD; |
3ae2e3a3 | 6540 | |
b029599f DC |
6541 | /* Scan the mark bits an int at a time. */ |
6542 | for (i = 0; i < ilim; i++) | |
6543 | { | |
9c23779a | 6544 | if (cblk->gcmarkbits[i] == BITS_WORD_MAX) |
b029599f DC |
6545 | { |
6546 | /* Fast path - all cons cells for this int are marked. */ | |
6547 | cblk->gcmarkbits[i] = 0; | |
9c23779a | 6548 | num_used += BITS_PER_BITS_WORD; |
b029599f DC |
6549 | } |
6550 | else | |
6551 | { | |
6552 | /* Some cons cells for this int are not marked. | |
6553 | Find which ones, and free them. */ | |
6554 | int start, pos, stop; | |
6555 | ||
9c23779a | 6556 | start = i * BITS_PER_BITS_WORD; |
b029599f | 6557 | stop = lim - start; |
9c23779a PE |
6558 | if (stop > BITS_PER_BITS_WORD) |
6559 | stop = BITS_PER_BITS_WORD; | |
b029599f DC |
6560 | stop += start; |
6561 | ||
6562 | for (pos = start; pos < stop; pos++) | |
6563 | { | |
6564 | if (!CONS_MARKED_P (&cblk->conses[pos])) | |
6565 | { | |
6566 | this_free++; | |
6567 | cblk->conses[pos].u.chain = cons_free_list; | |
6568 | cons_free_list = &cblk->conses[pos]; | |
34400008 | 6569 | #if GC_MARK_STACK |
b029599f | 6570 | cons_free_list->car = Vdead; |
34400008 | 6571 | #endif |
b029599f DC |
6572 | } |
6573 | else | |
6574 | { | |
6575 | num_used++; | |
6576 | CONS_UNMARK (&cblk->conses[pos]); | |
6577 | } | |
6578 | } | |
6579 | } | |
6580 | } | |
7146af97 | 6581 | |
b029599f DC |
6582 | lim = CONS_BLOCK_SIZE; |
6583 | /* If this block contains only free conses and we have already | |
6584 | seen more than two blocks worth of free conses then deallocate | |
6585 | this block. */ | |
6586 | if (this_free == CONS_BLOCK_SIZE && num_free > CONS_BLOCK_SIZE) | |
6587 | { | |
6588 | *cprev = cblk->next; | |
6589 | /* Unhook from the free list. */ | |
6590 | cons_free_list = cblk->conses[0].u.chain; | |
6591 | lisp_align_free (cblk); | |
6592 | } | |
6593 | else | |
6594 | { | |
6595 | num_free += this_free; | |
6596 | cprev = &cblk->next; | |
6597 | } | |
6598 | } | |
6599 | total_conses = num_used; | |
6600 | total_free_conses = num_free; | |
6601 | } | |
7146af97 | 6602 | |
b029599f DC |
6603 | NO_INLINE /* For better stack traces */ |
6604 | static void | |
6605 | sweep_floats (void) | |
6606 | { | |
6607 | register struct float_block *fblk; | |
6608 | struct float_block **fprev = &float_block; | |
6609 | register int lim = float_block_index; | |
6610 | EMACS_INT num_free = 0, num_used = 0; | |
177c0ea7 | 6611 | |
b029599f | 6612 | float_free_list = 0; |
7146af97 | 6613 | |
b029599f DC |
6614 | for (fblk = float_block; fblk; fblk = *fprev) |
6615 | { | |
6616 | register int i; | |
6617 | int this_free = 0; | |
6618 | for (i = 0; i < lim; i++) | |
6619 | if (!FLOAT_MARKED_P (&fblk->floats[i])) | |
6620 | { | |
6621 | this_free++; | |
6622 | fblk->floats[i].u.chain = float_free_list; | |
6623 | float_free_list = &fblk->floats[i]; | |
6624 | } | |
6625 | else | |
6626 | { | |
6627 | num_used++; | |
6628 | FLOAT_UNMARK (&fblk->floats[i]); | |
6629 | } | |
6630 | lim = FLOAT_BLOCK_SIZE; | |
6631 | /* If this block contains only free floats and we have already | |
6632 | seen more than two blocks worth of free floats then deallocate | |
6633 | this block. */ | |
6634 | if (this_free == FLOAT_BLOCK_SIZE && num_free > FLOAT_BLOCK_SIZE) | |
6635 | { | |
6636 | *fprev = fblk->next; | |
6637 | /* Unhook from the free list. */ | |
6638 | float_free_list = fblk->floats[0].u.chain; | |
6639 | lisp_align_free (fblk); | |
6640 | } | |
6641 | else | |
6642 | { | |
6643 | num_free += this_free; | |
6644 | fprev = &fblk->next; | |
6645 | } | |
6646 | } | |
6647 | total_floats = num_used; | |
6648 | total_free_floats = num_free; | |
6649 | } | |
d5e35230 | 6650 | |
b029599f DC |
6651 | NO_INLINE /* For better stack traces */ |
6652 | static void | |
6653 | sweep_intervals (void) | |
6654 | { | |
6655 | register struct interval_block *iblk; | |
6656 | struct interval_block **iprev = &interval_block; | |
6657 | register int lim = interval_block_index; | |
6658 | EMACS_INT num_free = 0, num_used = 0; | |
d5e35230 | 6659 | |
b029599f | 6660 | interval_free_list = 0; |
d5e35230 | 6661 | |
b029599f DC |
6662 | for (iblk = interval_block; iblk; iblk = *iprev) |
6663 | { | |
6664 | register int i; | |
6665 | int this_free = 0; | |
d5e35230 | 6666 | |
b029599f DC |
6667 | for (i = 0; i < lim; i++) |
6668 | { | |
6669 | if (!iblk->intervals[i].gcmarkbit) | |
6670 | { | |
6671 | set_interval_parent (&iblk->intervals[i], interval_free_list); | |
6672 | interval_free_list = &iblk->intervals[i]; | |
6673 | this_free++; | |
6674 | } | |
6675 | else | |
6676 | { | |
6677 | num_used++; | |
6678 | iblk->intervals[i].gcmarkbit = 0; | |
6679 | } | |
6680 | } | |
6681 | lim = INTERVAL_BLOCK_SIZE; | |
6682 | /* If this block contains only free intervals and we have already | |
6683 | seen more than two blocks worth of free intervals then | |
6684 | deallocate this block. */ | |
6685 | if (this_free == INTERVAL_BLOCK_SIZE && num_free > INTERVAL_BLOCK_SIZE) | |
6686 | { | |
6687 | *iprev = iblk->next; | |
6688 | /* Unhook from the free list. */ | |
6689 | interval_free_list = INTERVAL_PARENT (&iblk->intervals[0]); | |
6690 | lisp_free (iblk); | |
6691 | } | |
6692 | else | |
6693 | { | |
6694 | num_free += this_free; | |
6695 | iprev = &iblk->next; | |
6696 | } | |
6697 | } | |
6698 | total_intervals = num_used; | |
6699 | total_free_intervals = num_free; | |
6700 | } | |
7146af97 | 6701 | |
b029599f DC |
6702 | NO_INLINE /* For better stack traces */ |
6703 | static void | |
6704 | sweep_symbols (void) | |
6705 | { | |
6706 | register struct symbol_block *sblk; | |
6707 | struct symbol_block **sprev = &symbol_block; | |
6708 | register int lim = symbol_block_index; | |
6709 | EMACS_INT num_free = 0, num_used = 0; | |
177c0ea7 | 6710 | |
b029599f | 6711 | symbol_free_list = NULL; |
d285b373 | 6712 | |
b029599f DC |
6713 | for (sblk = symbol_block; sblk; sblk = *sprev) |
6714 | { | |
6715 | int this_free = 0; | |
6716 | union aligned_Lisp_Symbol *sym = sblk->symbols; | |
6717 | union aligned_Lisp_Symbol *end = sym + lim; | |
177c0ea7 | 6718 | |
b029599f DC |
6719 | for (; sym < end; ++sym) |
6720 | { | |
7e31acf6 | 6721 | if (!sym->s.gcmarkbit) |
b029599f DC |
6722 | { |
6723 | if (sym->s.redirect == SYMBOL_LOCALIZED) | |
6724 | xfree (SYMBOL_BLV (&sym->s)); | |
6725 | sym->s.next = symbol_free_list; | |
6726 | symbol_free_list = &sym->s; | |
34400008 | 6727 | #if GC_MARK_STACK |
b029599f | 6728 | symbol_free_list->function = Vdead; |
34400008 | 6729 | #endif |
b029599f DC |
6730 | ++this_free; |
6731 | } | |
6732 | else | |
6733 | { | |
6734 | ++num_used; | |
b029599f | 6735 | sym->s.gcmarkbit = 0; |
e3f04a4a DC |
6736 | /* Attempt to catch bogus objects. */ |
6737 | eassert (valid_lisp_object_p (sym->s.function) >= 1); | |
b029599f DC |
6738 | } |
6739 | } | |
177c0ea7 | 6740 | |
b029599f DC |
6741 | lim = SYMBOL_BLOCK_SIZE; |
6742 | /* If this block contains only free symbols and we have already | |
6743 | seen more than two blocks worth of free symbols then deallocate | |
6744 | this block. */ | |
6745 | if (this_free == SYMBOL_BLOCK_SIZE && num_free > SYMBOL_BLOCK_SIZE) | |
6746 | { | |
6747 | *sprev = sblk->next; | |
6748 | /* Unhook from the free list. */ | |
6749 | symbol_free_list = sblk->symbols[0].s.next; | |
6750 | lisp_free (sblk); | |
6751 | } | |
6752 | else | |
6753 | { | |
6754 | num_free += this_free; | |
6755 | sprev = &sblk->next; | |
6756 | } | |
6757 | } | |
6758 | total_symbols = num_used; | |
6759 | total_free_symbols = num_free; | |
6760 | } | |
7146af97 | 6761 | |
b029599f DC |
6762 | NO_INLINE /* For better stack traces */ |
6763 | static void | |
6764 | sweep_misc (void) | |
6765 | { | |
6766 | register struct marker_block *mblk; | |
6767 | struct marker_block **mprev = &marker_block; | |
6768 | register int lim = marker_block_index; | |
6769 | EMACS_INT num_free = 0, num_used = 0; | |
7146af97 | 6770 | |
b029599f DC |
6771 | /* Put all unmarked misc's on free list. For a marker, first |
6772 | unchain it from the buffer it points into. */ | |
177c0ea7 | 6773 | |
b029599f | 6774 | marker_free_list = 0; |
fa05e253 | 6775 | |
b029599f DC |
6776 | for (mblk = marker_block; mblk; mblk = *mprev) |
6777 | { | |
6778 | register int i; | |
6779 | int this_free = 0; | |
7146af97 | 6780 | |
b029599f DC |
6781 | for (i = 0; i < lim; i++) |
6782 | { | |
6783 | if (!mblk->markers[i].m.u_any.gcmarkbit) | |
6784 | { | |
6785 | if (mblk->markers[i].m.u_any.type == Lisp_Misc_Marker) | |
6786 | unchain_marker (&mblk->markers[i].m.u_marker); | |
6787 | /* Set the type of the freed object to Lisp_Misc_Free. | |
6788 | We could leave the type alone, since nobody checks it, | |
6789 | but this might catch bugs faster. */ | |
6790 | mblk->markers[i].m.u_marker.type = Lisp_Misc_Free; | |
6791 | mblk->markers[i].m.u_free.chain = marker_free_list; | |
6792 | marker_free_list = &mblk->markers[i].m; | |
6793 | this_free++; | |
6794 | } | |
6795 | else | |
6796 | { | |
6797 | num_used++; | |
6798 | mblk->markers[i].m.u_any.gcmarkbit = 0; | |
6799 | } | |
6800 | } | |
6801 | lim = MARKER_BLOCK_SIZE; | |
6802 | /* If this block contains only free markers and we have already | |
6803 | seen more than two blocks worth of free markers then deallocate | |
6804 | this block. */ | |
6805 | if (this_free == MARKER_BLOCK_SIZE && num_free > MARKER_BLOCK_SIZE) | |
6806 | { | |
6807 | *mprev = mblk->next; | |
6808 | /* Unhook from the free list. */ | |
6809 | marker_free_list = mblk->markers[0].m.u_free.chain; | |
6810 | lisp_free (mblk); | |
6811 | } | |
6812 | else | |
6813 | { | |
6814 | num_free += this_free; | |
6815 | mprev = &mblk->next; | |
6816 | } | |
6817 | } | |
7146af97 | 6818 | |
b029599f DC |
6819 | total_markers = num_used; |
6820 | total_free_markers = num_free; | |
6821 | } | |
7146af97 | 6822 | |
b029599f DC |
6823 | NO_INLINE /* For better stack traces */ |
6824 | static void | |
6825 | sweep_buffers (void) | |
6826 | { | |
6827 | register struct buffer *buffer, **bprev = &all_buffers; | |
7146af97 | 6828 | |
b029599f DC |
6829 | total_buffers = 0; |
6830 | for (buffer = all_buffers; buffer; buffer = *bprev) | |
6831 | if (!VECTOR_MARKED_P (buffer)) | |
6832 | { | |
6833 | *bprev = buffer->next; | |
6834 | lisp_free (buffer); | |
6835 | } | |
6836 | else | |
6837 | { | |
6838 | VECTOR_UNMARK (buffer); | |
6839 | /* Do not use buffer_(set|get)_intervals here. */ | |
6840 | buffer->text->intervals = balance_intervals (buffer->text->intervals); | |
6841 | total_buffers++; | |
6842 | bprev = &buffer->next; | |
6843 | } | |
7146af97 | 6844 | } |
7146af97 | 6845 | |
b029599f DC |
6846 | /* Sweep: find all structures not marked, and free them. */ |
6847 | static void | |
6848 | gc_sweep (void) | |
6849 | { | |
6850 | /* Remove or mark entries in weak hash tables. | |
6851 | This must be done before any object is unmarked. */ | |
6852 | sweep_weak_hash_tables (); | |
7146af97 | 6853 | |
b029599f DC |
6854 | sweep_strings (); |
6855 | check_string_bytes (!noninteractive); | |
6856 | sweep_conses (); | |
6857 | sweep_floats (); | |
6858 | sweep_intervals (); | |
6859 | sweep_symbols (); | |
6860 | sweep_misc (); | |
6861 | sweep_buffers (); | |
6862 | sweep_vectors (); | |
6863 | check_string_bytes (!noninteractive); | |
6864 | } | |
7146af97 | 6865 | |
7146af97 | 6866 | \f |
20d24714 JB |
6867 | /* Debugging aids. */ |
6868 | ||
31ce1c91 | 6869 | DEFUN ("memory-limit", Fmemory_limit, Smemory_limit, 0, 0, 0, |
a6266d23 | 6870 | doc: /* Return the address of the last byte Emacs has allocated, divided by 1024. |
228299fa | 6871 | This may be helpful in debugging Emacs's memory usage. |
7ee72033 | 6872 | We divide the value by 1024 to make sure it fits in a Lisp integer. */) |
5842a27b | 6873 | (void) |
20d24714 JB |
6874 | { |
6875 | Lisp_Object end; | |
6876 | ||
5e48429a JD |
6877 | #ifdef HAVE_NS |
6878 | /* Avoid warning. sbrk has no relation to memory allocated anyway. */ | |
6879 | XSETINT (end, 0); | |
6880 | #else | |
d01a7826 | 6881 | XSETINT (end, (intptr_t) (char *) sbrk (0) / 1024); |
5e48429a | 6882 | #endif |
20d24714 JB |
6883 | |
6884 | return end; | |
6885 | } | |
6886 | ||
310ea200 | 6887 | DEFUN ("memory-use-counts", Fmemory_use_counts, Smemory_use_counts, 0, 0, 0, |
a6266d23 | 6888 | doc: /* Return a list of counters that measure how much consing there has been. |
228299fa GM |
6889 | Each of these counters increments for a certain kind of object. |
6890 | The counters wrap around from the largest positive integer to zero. | |
6891 | Garbage collection does not decrease them. | |
6892 | The elements of the value are as follows: | |
6893 | (CONSES FLOATS VECTOR-CELLS SYMBOLS STRING-CHARS MISCS INTERVALS STRINGS) | |
6894 | All are in units of 1 = one object consed | |
6895 | except for VECTOR-CELLS and STRING-CHARS, which count the total length of | |
6896 | objects consed. | |
6897 | MISCS include overlays, markers, and some internal types. | |
6898 | Frames, windows, buffers, and subprocesses count as vectors | |
7ee72033 | 6899 | (but the contents of a buffer's text do not count here). */) |
5842a27b | 6900 | (void) |
310ea200 | 6901 | { |
3438fe21 | 6902 | return listn (CONSTYPE_HEAP, 8, |
694b6c97 DA |
6903 | bounded_number (cons_cells_consed), |
6904 | bounded_number (floats_consed), | |
6905 | bounded_number (vector_cells_consed), | |
6906 | bounded_number (symbols_consed), | |
6907 | bounded_number (string_chars_consed), | |
6908 | bounded_number (misc_objects_consed), | |
6909 | bounded_number (intervals_consed), | |
6910 | bounded_number (strings_consed)); | |
310ea200 | 6911 | } |
e0b8c689 | 6912 | |
8b058d44 EZ |
6913 | /* Find at most FIND_MAX symbols which have OBJ as their value or |
6914 | function. This is used in gdbinit's `xwhichsymbols' command. */ | |
6915 | ||
6916 | Lisp_Object | |
196e41e4 | 6917 | which_symbols (Lisp_Object obj, EMACS_INT find_max) |
8b058d44 EZ |
6918 | { |
6919 | struct symbol_block *sblk; | |
8d0eb4c2 | 6920 | ptrdiff_t gc_count = inhibit_garbage_collection (); |
8b058d44 EZ |
6921 | Lisp_Object found = Qnil; |
6922 | ||
ca78dc43 | 6923 | if (! DEADP (obj)) |
8b058d44 EZ |
6924 | { |
6925 | for (sblk = symbol_block; sblk; sblk = sblk->next) | |
6926 | { | |
9426aba4 | 6927 | union aligned_Lisp_Symbol *aligned_sym = sblk->symbols; |
8b058d44 EZ |
6928 | int bn; |
6929 | ||
9426aba4 | 6930 | for (bn = 0; bn < SYMBOL_BLOCK_SIZE; bn++, aligned_sym++) |
8b058d44 | 6931 | { |
9426aba4 | 6932 | struct Lisp_Symbol *sym = &aligned_sym->s; |
8b058d44 EZ |
6933 | Lisp_Object val; |
6934 | Lisp_Object tem; | |
6935 | ||
6936 | if (sblk == symbol_block && bn >= symbol_block_index) | |
6937 | break; | |
6938 | ||
6939 | XSETSYMBOL (tem, sym); | |
6940 | val = find_symbol_value (tem); | |
6941 | if (EQ (val, obj) | |
c644523b DA |
6942 | || EQ (sym->function, obj) |
6943 | || (!NILP (sym->function) | |
6944 | && COMPILEDP (sym->function) | |
6945 | && EQ (AREF (sym->function, COMPILED_BYTECODE), obj)) | |
8b058d44 EZ |
6946 | || (!NILP (val) |
6947 | && COMPILEDP (val) | |
6948 | && EQ (AREF (val, COMPILED_BYTECODE), obj))) | |
6949 | { | |
6950 | found = Fcons (tem, found); | |
6951 | if (--find_max == 0) | |
6952 | goto out; | |
6953 | } | |
6954 | } | |
6955 | } | |
6956 | } | |
6957 | ||
6958 | out: | |
6959 | unbind_to (gc_count, Qnil); | |
6960 | return found; | |
6961 | } | |
6962 | ||
01ae0fbf DC |
6963 | #ifdef SUSPICIOUS_OBJECT_CHECKING |
6964 | ||
608a4502 | 6965 | static void * |
faa52174 | 6966 | find_suspicious_object_in_range (void *begin, void *end) |
01ae0fbf | 6967 | { |
faa52174 PE |
6968 | char *begin_a = begin; |
6969 | char *end_a = end; | |
01ae0fbf DC |
6970 | int i; |
6971 | ||
faa52174 PE |
6972 | for (i = 0; i < ARRAYELTS (suspicious_objects); ++i) |
6973 | { | |
6974 | char *suspicious_object = suspicious_objects[i]; | |
6975 | if (begin_a <= suspicious_object && suspicious_object < end_a) | |
6976 | return suspicious_object; | |
6977 | } | |
01ae0fbf DC |
6978 | |
6979 | return NULL; | |
6980 | } | |
6981 | ||
6982 | static void | |
1b85074c | 6983 | note_suspicious_free (void* ptr) |
01ae0fbf | 6984 | { |
01ae0fbf DC |
6985 | struct suspicious_free_record* rec; |
6986 | ||
1b85074c DC |
6987 | rec = &suspicious_free_history[suspicious_free_history_index++]; |
6988 | if (suspicious_free_history_index == | |
1e1a3a32 | 6989 | ARRAYELTS (suspicious_free_history)) |
1b85074c DC |
6990 | { |
6991 | suspicious_free_history_index = 0; | |
6992 | } | |
6993 | ||
6994 | memset (rec, 0, sizeof (*rec)); | |
6995 | rec->suspicious_object = ptr; | |
1e1a3a32 | 6996 | backtrace (&rec->backtrace[0], ARRAYELTS (rec->backtrace)); |
1b85074c DC |
6997 | } |
6998 | ||
6999 | static void | |
7000 | detect_suspicious_free (void* ptr) | |
01ae0fbf DC |
7001 | { |
7002 | int i; | |
01ae0fbf DC |
7003 | |
7004 | eassert (ptr != NULL); | |
7005 | ||
c72d972c | 7006 | for (i = 0; i < ARRAYELTS (suspicious_objects); ++i) |
01ae0fbf DC |
7007 | if (suspicious_objects[i] == ptr) |
7008 | { | |
1b85074c | 7009 | note_suspicious_free (ptr); |
01ae0fbf DC |
7010 | suspicious_objects[i] = NULL; |
7011 | } | |
7012 | } | |
7013 | ||
7014 | #endif /* SUSPICIOUS_OBJECT_CHECKING */ | |
7015 | ||
7016 | DEFUN ("suspicious-object", Fsuspicious_object, Ssuspicious_object, 1, 1, 0, | |
7017 | doc: /* Return OBJ, maybe marking it for extra scrutiny. | |
7018 | If Emacs is compiled with suspicous object checking, capture | |
7019 | a stack trace when OBJ is freed in order to help track down | |
7020 | garbage collection bugs. Otherwise, do nothing and return OBJ. */) | |
7021 | (Lisp_Object obj) | |
7022 | { | |
7023 | #ifdef SUSPICIOUS_OBJECT_CHECKING | |
7024 | /* Right now, we care only about vectors. */ | |
faa52174 PE |
7025 | if (VECTORLIKEP (obj)) |
7026 | { | |
7027 | suspicious_objects[suspicious_object_index++] = XVECTOR (obj); | |
7028 | if (suspicious_object_index == ARRAYELTS (suspicious_objects)) | |
7029 | suspicious_object_index = 0; | |
7030 | } | |
01ae0fbf DC |
7031 | #endif |
7032 | return obj; | |
7033 | } | |
7034 | ||
244ed907 | 7035 | #ifdef ENABLE_CHECKING |
f4a681b0 | 7036 | |
fce31d69 | 7037 | bool suppress_checking; |
d3d47262 | 7038 | |
e0b8c689 | 7039 | void |
971de7fb | 7040 | die (const char *msg, const char *file, int line) |
e0b8c689 | 7041 | { |
5013fc08 | 7042 | fprintf (stderr, "\r\n%s:%d: Emacs fatal error: assertion failed: %s\r\n", |
e0b8c689 | 7043 | file, line, msg); |
4d7e6e51 | 7044 | terminate_due_to_signal (SIGABRT, INT_MAX); |
e0b8c689 | 7045 | } |
244ed907 | 7046 | #endif |
20d24714 | 7047 | \f |
b09cca6a | 7048 | /* Initialization. */ |
7146af97 | 7049 | |
dfcf069d | 7050 | void |
971de7fb | 7051 | init_alloc_once (void) |
7146af97 JB |
7052 | { |
7053 | /* Used to do Vpurify_flag = Qt here, but Qt isn't set up yet! */ | |
9e713715 GM |
7054 | purebeg = PUREBEG; |
7055 | pure_size = PURESIZE; | |
ab6780cd | 7056 | |
877935b1 | 7057 | #if GC_MARK_STACK || defined GC_MALLOC_CHECK |
34400008 GM |
7058 | mem_init (); |
7059 | Vdead = make_pure_string ("DEAD", 4, 4, 0); | |
7060 | #endif | |
9e713715 | 7061 | |
d1658221 | 7062 | #ifdef DOUG_LEA_MALLOC |
b09cca6a SM |
7063 | mallopt (M_TRIM_THRESHOLD, 128 * 1024); /* Trim threshold. */ |
7064 | mallopt (M_MMAP_THRESHOLD, 64 * 1024); /* Mmap threshold. */ | |
7065 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); /* Max. number of mmap'ed areas. */ | |
d1658221 | 7066 | #endif |
7146af97 | 7067 | init_strings (); |
f3372c87 | 7068 | init_vectors (); |
d5e35230 | 7069 | |
24d8a105 | 7070 | refill_memory_reserve (); |
0dd6d66d | 7071 | gc_cons_threshold = GC_DEFAULT_THRESHOLD; |
7146af97 JB |
7072 | } |
7073 | ||
dfcf069d | 7074 | void |
971de7fb | 7075 | init_alloc (void) |
7146af97 JB |
7076 | { |
7077 | gcprolist = 0; | |
630686c8 | 7078 | byte_stack_list = 0; |
182ff242 GM |
7079 | #if GC_MARK_STACK |
7080 | #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS | |
7081 | setjmp_tested_p = longjmps_done = 0; | |
7082 | #endif | |
7083 | #endif | |
2c5bd608 DL |
7084 | Vgc_elapsed = make_float (0.0); |
7085 | gcs_done = 0; | |
a84683fd DC |
7086 | |
7087 | #if USE_VALGRIND | |
d160dd0c | 7088 | valgrind_p = RUNNING_ON_VALGRIND != 0; |
a84683fd | 7089 | #endif |
7146af97 JB |
7090 | } |
7091 | ||
7092 | void | |
971de7fb | 7093 | syms_of_alloc (void) |
7146af97 | 7094 | { |
29208e82 | 7095 | DEFVAR_INT ("gc-cons-threshold", gc_cons_threshold, |
fb7ada5f | 7096 | doc: /* Number of bytes of consing between garbage collections. |
228299fa GM |
7097 | Garbage collection can happen automatically once this many bytes have been |
7098 | allocated since the last garbage collection. All data types count. | |
7146af97 | 7099 | |
228299fa | 7100 | Garbage collection happens automatically only when `eval' is called. |
7146af97 | 7101 | |
228299fa | 7102 | By binding this temporarily to a large number, you can effectively |
96f077ad SM |
7103 | prevent garbage collection during a part of the program. |
7104 | See also `gc-cons-percentage'. */); | |
7105 | ||
29208e82 | 7106 | DEFVAR_LISP ("gc-cons-percentage", Vgc_cons_percentage, |
fb7ada5f | 7107 | doc: /* Portion of the heap used for allocation. |
96f077ad SM |
7108 | Garbage collection can happen automatically once this portion of the heap |
7109 | has been allocated since the last garbage collection. | |
7110 | If this portion is smaller than `gc-cons-threshold', this is ignored. */); | |
7111 | Vgc_cons_percentage = make_float (0.1); | |
0819585c | 7112 | |
29208e82 | 7113 | DEFVAR_INT ("pure-bytes-used", pure_bytes_used, |
333f9019 | 7114 | doc: /* Number of bytes of shareable Lisp data allocated so far. */); |
0819585c | 7115 | |
29208e82 | 7116 | DEFVAR_INT ("cons-cells-consed", cons_cells_consed, |
a6266d23 | 7117 | doc: /* Number of cons cells that have been consed so far. */); |
0819585c | 7118 | |
29208e82 | 7119 | DEFVAR_INT ("floats-consed", floats_consed, |
a6266d23 | 7120 | doc: /* Number of floats that have been consed so far. */); |
0819585c | 7121 | |
29208e82 | 7122 | DEFVAR_INT ("vector-cells-consed", vector_cells_consed, |
a6266d23 | 7123 | doc: /* Number of vector cells that have been consed so far. */); |
0819585c | 7124 | |
29208e82 | 7125 | DEFVAR_INT ("symbols-consed", symbols_consed, |
a6266d23 | 7126 | doc: /* Number of symbols that have been consed so far. */); |
0819585c | 7127 | |
29208e82 | 7128 | DEFVAR_INT ("string-chars-consed", string_chars_consed, |
a6266d23 | 7129 | doc: /* Number of string characters that have been consed so far. */); |
0819585c | 7130 | |
29208e82 | 7131 | DEFVAR_INT ("misc-objects-consed", misc_objects_consed, |
01a6dcc8 GM |
7132 | doc: /* Number of miscellaneous objects that have been consed so far. |
7133 | These include markers and overlays, plus certain objects not visible | |
7134 | to users. */); | |
2e471eb5 | 7135 | |
29208e82 | 7136 | DEFVAR_INT ("intervals-consed", intervals_consed, |
a6266d23 | 7137 | doc: /* Number of intervals that have been consed so far. */); |
7146af97 | 7138 | |
29208e82 | 7139 | DEFVAR_INT ("strings-consed", strings_consed, |
a6266d23 | 7140 | doc: /* Number of strings that have been consed so far. */); |
228299fa | 7141 | |
29208e82 | 7142 | DEFVAR_LISP ("purify-flag", Vpurify_flag, |
a6266d23 | 7143 | doc: /* Non-nil means loading Lisp code in order to dump an executable. |
e9515805 SM |
7144 | This means that certain objects should be allocated in shared (pure) space. |
7145 | It can also be set to a hash-table, in which case this table is used to | |
7146 | do hash-consing of the objects allocated to pure space. */); | |
228299fa | 7147 | |
29208e82 | 7148 | DEFVAR_BOOL ("garbage-collection-messages", garbage_collection_messages, |
a6266d23 | 7149 | doc: /* Non-nil means display messages at start and end of garbage collection. */); |
299585ee RS |
7150 | garbage_collection_messages = 0; |
7151 | ||
29208e82 | 7152 | DEFVAR_LISP ("post-gc-hook", Vpost_gc_hook, |
a6266d23 | 7153 | doc: /* Hook run after garbage collection has finished. */); |
9e713715 | 7154 | Vpost_gc_hook = Qnil; |
cd3520a4 | 7155 | DEFSYM (Qpost_gc_hook, "post-gc-hook"); |
9e713715 | 7156 | |
29208e82 | 7157 | DEFVAR_LISP ("memory-signal-data", Vmemory_signal_data, |
74a54b04 | 7158 | doc: /* Precomputed `signal' argument for memory-full error. */); |
bcb61d60 KH |
7159 | /* We build this in advance because if we wait until we need it, we might |
7160 | not be able to allocate the memory to hold it. */ | |
74a54b04 | 7161 | Vmemory_signal_data |
3438fe21 | 7162 | = listn (CONSTYPE_PURE, 2, Qerror, |
694b6c97 | 7163 | build_pure_c_string ("Memory exhausted--use M-x save-some-buffers then exit and restart Emacs")); |
74a54b04 | 7164 | |
29208e82 | 7165 | DEFVAR_LISP ("memory-full", Vmemory_full, |
24d8a105 | 7166 | doc: /* Non-nil means Emacs cannot get much more Lisp memory. */); |
74a54b04 | 7167 | Vmemory_full = Qnil; |
bcb61d60 | 7168 | |
fecbd8ff SM |
7169 | DEFSYM (Qconses, "conses"); |
7170 | DEFSYM (Qsymbols, "symbols"); | |
7171 | DEFSYM (Qmiscs, "miscs"); | |
7172 | DEFSYM (Qstrings, "strings"); | |
7173 | DEFSYM (Qvectors, "vectors"); | |
7174 | DEFSYM (Qfloats, "floats"); | |
7175 | DEFSYM (Qintervals, "intervals"); | |
7176 | DEFSYM (Qbuffers, "buffers"); | |
5b835e1d DA |
7177 | DEFSYM (Qstring_bytes, "string-bytes"); |
7178 | DEFSYM (Qvector_slots, "vector-slots"); | |
f8643a6b | 7179 | DEFSYM (Qheap, "heap"); |
3d80c99f | 7180 | DEFSYM (Qautomatic_gc, "Automatic GC"); |
5b835e1d | 7181 | |
cd3520a4 JB |
7182 | DEFSYM (Qgc_cons_threshold, "gc-cons-threshold"); |
7183 | DEFSYM (Qchar_table_extra_slots, "char-table-extra-slots"); | |
a59de17b | 7184 | |
29208e82 | 7185 | DEFVAR_LISP ("gc-elapsed", Vgc_elapsed, |
2c5bd608 | 7186 | doc: /* Accumulated time elapsed in garbage collections. |
e7415487 | 7187 | The time is in seconds as a floating point value. */); |
29208e82 | 7188 | DEFVAR_INT ("gcs-done", gcs_done, |
e7415487 | 7189 | doc: /* Accumulated number of garbage collections done. */); |
2c5bd608 | 7190 | |
7146af97 JB |
7191 | defsubr (&Scons); |
7192 | defsubr (&Slist); | |
7193 | defsubr (&Svector); | |
2bcf0551 | 7194 | defsubr (&Sbool_vector); |
7146af97 JB |
7195 | defsubr (&Smake_byte_code); |
7196 | defsubr (&Smake_list); | |
7197 | defsubr (&Smake_vector); | |
7198 | defsubr (&Smake_string); | |
7b07587b | 7199 | defsubr (&Smake_bool_vector); |
7146af97 JB |
7200 | defsubr (&Smake_symbol); |
7201 | defsubr (&Smake_marker); | |
7202 | defsubr (&Spurecopy); | |
7203 | defsubr (&Sgarbage_collect); | |
20d24714 | 7204 | defsubr (&Smemory_limit); |
310ea200 | 7205 | defsubr (&Smemory_use_counts); |
01ae0fbf | 7206 | defsubr (&Ssuspicious_object); |
34400008 GM |
7207 | |
7208 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES | |
7209 | defsubr (&Sgc_status); | |
7210 | #endif | |
7146af97 | 7211 | } |
5eceb8fb | 7212 | |
4706125e PE |
7213 | /* When compiled with GCC, GDB might say "No enum type named |
7214 | pvec_type" if we don't have at least one symbol with that type, and | |
7215 | then xbacktrace could fail. Similarly for the other enums and | |
62aba0d4 FP |
7216 | their values. Some non-GCC compilers don't like these constructs. */ |
7217 | #ifdef __GNUC__ | |
4706125e PE |
7218 | union |
7219 | { | |
03a660a6 PE |
7220 | enum CHARTAB_SIZE_BITS CHARTAB_SIZE_BITS; |
7221 | enum CHAR_TABLE_STANDARD_SLOTS CHAR_TABLE_STANDARD_SLOTS; | |
7222 | enum char_bits char_bits; | |
4706125e | 7223 | enum CHECK_LISP_OBJECT_TYPE CHECK_LISP_OBJECT_TYPE; |
03a660a6 | 7224 | enum DEFAULT_HASH_SIZE DEFAULT_HASH_SIZE; |
4706125e | 7225 | enum Lisp_Bits Lisp_Bits; |
03a660a6 PE |
7226 | enum Lisp_Compiled Lisp_Compiled; |
7227 | enum maxargs maxargs; | |
7228 | enum MAX_ALLOCA MAX_ALLOCA; | |
4706125e PE |
7229 | enum More_Lisp_Bits More_Lisp_Bits; |
7230 | enum pvec_type pvec_type; | |
7231 | } const EXTERNALLY_VISIBLE gdb_make_enums_visible = {0}; | |
62aba0d4 | 7232 | #endif /* __GNUC__ */ |