Commit | Line | Data |
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7146af97 | 1 | /* Storage allocation and gc for GNU Emacs Lisp interpreter. |
999dd333 | 2 | |
ab422c4d PE |
3 | Copyright (C) 1985-1986, 1988, 1993-1995, 1997-2013 Free Software |
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. */ |
0328b6de | 45 | |
0065d054 | 46 | #include <verify.h> |
e065a56e | 47 | |
52828e02 PE |
48 | /* GC_CHECK_MARKED_OBJECTS means do sanity checks on allocated objects. |
49 | Doable only if GC_MARK_STACK. */ | |
50 | #if ! GC_MARK_STACK | |
51 | # undef GC_CHECK_MARKED_OBJECTS | |
52 | #endif | |
53 | ||
6b61353c | 54 | /* GC_MALLOC_CHECK defined means perform validity checks of malloc'd |
52828e02 PE |
55 | memory. Can do this only if using gmalloc.c and if not checking |
56 | marked objects. */ | |
6b61353c | 57 | |
52828e02 PE |
58 | #if (defined SYSTEM_MALLOC || defined DOUG_LEA_MALLOC \ |
59 | || defined GC_CHECK_MARKED_OBJECTS) | |
6b61353c KH |
60 | #undef GC_MALLOC_CHECK |
61 | #endif | |
62 | ||
bf952fb6 | 63 | #include <unistd.h> |
de7124a7 | 64 | #include <fcntl.h> |
de7124a7 | 65 | |
a411ac43 PE |
66 | #ifdef USE_GTK |
67 | # include "gtkutil.h" | |
68 | #endif | |
69666f77 | 69 | #ifdef WINDOWSNT |
f892cf9c | 70 | #include "w32.h" |
62aba0d4 | 71 | #include "w32heap.h" /* for sbrk */ |
69666f77 EZ |
72 | #endif |
73 | ||
d1658221 | 74 | #ifdef DOUG_LEA_MALLOC |
2e471eb5 | 75 | |
d1658221 | 76 | #include <malloc.h> |
81d492d5 | 77 | |
2e471eb5 GM |
78 | /* Specify maximum number of areas to mmap. It would be nice to use a |
79 | value that explicitly means "no limit". */ | |
80 | ||
81d492d5 RS |
81 | #define MMAP_MAX_AREAS 100000000 |
82 | ||
2e471eb5 | 83 | #endif /* not DOUG_LEA_MALLOC */ |
276cbe5a | 84 | |
2e471eb5 GM |
85 | /* Mark, unmark, query mark bit of a Lisp string. S must be a pointer |
86 | to a struct Lisp_String. */ | |
87 | ||
7cdee936 SM |
88 | #define MARK_STRING(S) ((S)->size |= ARRAY_MARK_FLAG) |
89 | #define UNMARK_STRING(S) ((S)->size &= ~ARRAY_MARK_FLAG) | |
b059de99 | 90 | #define STRING_MARKED_P(S) (((S)->size & ARRAY_MARK_FLAG) != 0) |
2e471eb5 | 91 | |
eab3844f PE |
92 | #define VECTOR_MARK(V) ((V)->header.size |= ARRAY_MARK_FLAG) |
93 | #define VECTOR_UNMARK(V) ((V)->header.size &= ~ARRAY_MARK_FLAG) | |
94 | #define VECTOR_MARKED_P(V) (((V)->header.size & ARRAY_MARK_FLAG) != 0) | |
3ef06d12 | 95 | |
0dd6d66d DA |
96 | /* Default value of gc_cons_threshold (see below). */ |
97 | ||
663e2b3f | 98 | #define GC_DEFAULT_THRESHOLD (100000 * word_size) |
0dd6d66d | 99 | |
29208e82 TT |
100 | /* Global variables. */ |
101 | struct emacs_globals globals; | |
102 | ||
2e471eb5 GM |
103 | /* Number of bytes of consing done since the last gc. */ |
104 | ||
dac616ff | 105 | EMACS_INT consing_since_gc; |
7146af97 | 106 | |
974aae61 RS |
107 | /* Similar minimum, computed from Vgc_cons_percentage. */ |
108 | ||
dac616ff | 109 | EMACS_INT gc_relative_threshold; |
310ea200 | 110 | |
24d8a105 RS |
111 | /* Minimum number of bytes of consing since GC before next GC, |
112 | when memory is full. */ | |
113 | ||
dac616ff | 114 | EMACS_INT memory_full_cons_threshold; |
24d8a105 | 115 | |
fce31d69 | 116 | /* True during GC. */ |
2e471eb5 | 117 | |
fce31d69 | 118 | bool gc_in_progress; |
7146af97 | 119 | |
fce31d69 | 120 | /* True means abort if try to GC. |
3de0effb RS |
121 | This is for code which is written on the assumption that |
122 | no GC will happen, so as to verify that assumption. */ | |
123 | ||
fce31d69 | 124 | bool abort_on_gc; |
3de0effb | 125 | |
34400008 GM |
126 | /* Number of live and free conses etc. */ |
127 | ||
3ab6e069 | 128 | static EMACS_INT total_conses, total_markers, total_symbols, total_buffers; |
c0c5c8ae | 129 | static EMACS_INT total_free_conses, total_free_markers, total_free_symbols; |
3ab6e069 | 130 | static EMACS_INT total_free_floats, total_floats; |
fd27a537 | 131 | |
2e471eb5 | 132 | /* Points to memory space allocated as "spare", to be freed if we run |
24d8a105 RS |
133 | out of memory. We keep one large block, four cons-blocks, and |
134 | two string blocks. */ | |
2e471eb5 | 135 | |
d3d47262 | 136 | static char *spare_memory[7]; |
276cbe5a | 137 | |
2b6148e4 PE |
138 | /* Amount of spare memory to keep in large reserve block, or to see |
139 | whether this much is available when malloc fails on a larger request. */ | |
2e471eb5 | 140 | |
276cbe5a | 141 | #define SPARE_MEMORY (1 << 14) |
4d09bcf6 | 142 | |
1b8950e5 RS |
143 | /* Initialize it to a nonzero value to force it into data space |
144 | (rather than bss space). That way unexec will remap it into text | |
145 | space (pure), on some systems. We have not implemented the | |
146 | remapping on more recent systems because this is less important | |
147 | nowadays than in the days of small memories and timesharing. */ | |
2e471eb5 | 148 | |
2c4685ee | 149 | EMACS_INT pure[(PURESIZE + sizeof (EMACS_INT) - 1) / sizeof (EMACS_INT)] = {1,}; |
7146af97 | 150 | #define PUREBEG (char *) pure |
2e471eb5 | 151 | |
9e713715 | 152 | /* Pointer to the pure area, and its size. */ |
2e471eb5 | 153 | |
9e713715 | 154 | static char *purebeg; |
903fe15d | 155 | static ptrdiff_t pure_size; |
9e713715 GM |
156 | |
157 | /* Number of bytes of pure storage used before pure storage overflowed. | |
158 | If this is non-zero, this implies that an overflow occurred. */ | |
159 | ||
903fe15d | 160 | static ptrdiff_t pure_bytes_used_before_overflow; |
7146af97 | 161 | |
fce31d69 | 162 | /* True if P points into pure space. */ |
34400008 GM |
163 | |
164 | #define PURE_POINTER_P(P) \ | |
6a0bf43d | 165 | ((uintptr_t) (P) - (uintptr_t) purebeg <= pure_size) |
34400008 | 166 | |
fecbd8ff | 167 | /* Index in pure at which next pure Lisp object will be allocated.. */ |
e5bc14d4 | 168 | |
d311d28c | 169 | static ptrdiff_t pure_bytes_used_lisp; |
e5bc14d4 YM |
170 | |
171 | /* Number of bytes allocated for non-Lisp objects in pure storage. */ | |
172 | ||
d311d28c | 173 | static ptrdiff_t pure_bytes_used_non_lisp; |
e5bc14d4 | 174 | |
2e471eb5 GM |
175 | /* If nonzero, this is a warning delivered by malloc and not yet |
176 | displayed. */ | |
177 | ||
a8fe7202 | 178 | const char *pending_malloc_warning; |
7146af97 JB |
179 | |
180 | /* Maximum amount of C stack to save when a GC happens. */ | |
181 | ||
182 | #ifndef MAX_SAVE_STACK | |
183 | #define MAX_SAVE_STACK 16000 | |
184 | #endif | |
185 | ||
186 | /* Buffer in which we save a copy of the C stack at each GC. */ | |
187 | ||
dd3f25f7 | 188 | #if MAX_SAVE_STACK > 0 |
d3d47262 | 189 | static char *stack_copy; |
903fe15d | 190 | static ptrdiff_t stack_copy_size; |
dd3f25f7 | 191 | #endif |
7146af97 | 192 | |
fecbd8ff SM |
193 | static Lisp_Object Qconses; |
194 | static Lisp_Object Qsymbols; | |
195 | static Lisp_Object Qmiscs; | |
196 | static Lisp_Object Qstrings; | |
197 | static Lisp_Object Qvectors; | |
198 | static Lisp_Object Qfloats; | |
199 | static Lisp_Object Qintervals; | |
200 | static Lisp_Object Qbuffers; | |
f8643a6b | 201 | static Lisp_Object Qstring_bytes, Qvector_slots, Qheap; |
955cbe7b | 202 | static Lisp_Object Qgc_cons_threshold; |
3d80c99f | 203 | Lisp_Object Qautomatic_gc; |
955cbe7b | 204 | Lisp_Object Qchar_table_extra_slots; |
e8197642 | 205 | |
9e713715 GM |
206 | /* Hook run after GC has finished. */ |
207 | ||
955cbe7b | 208 | static Lisp_Object Qpost_gc_hook; |
2c5bd608 | 209 | |
f57e2426 | 210 | static void mark_terminals (void); |
f57e2426 | 211 | static void gc_sweep (void); |
72cb32cf | 212 | static Lisp_Object make_pure_vector (ptrdiff_t); |
c752cfa9 | 213 | static void mark_buffer (struct buffer *); |
41c28a37 | 214 | |
69003fd8 PE |
215 | #if !defined REL_ALLOC || defined SYSTEM_MALLOC |
216 | static void refill_memory_reserve (void); | |
217 | #endif | |
f57e2426 J |
218 | static void compact_small_strings (void); |
219 | static void free_large_strings (void); | |
196e41e4 | 220 | extern Lisp_Object which_symbols (Lisp_Object, EMACS_INT) EXTERNALLY_VISIBLE; |
34400008 | 221 | |
914adc42 DA |
222 | /* When scanning the C stack for live Lisp objects, Emacs keeps track of |
223 | what memory allocated via lisp_malloc and lisp_align_malloc is intended | |
224 | for what purpose. This enumeration specifies the type of memory. */ | |
34400008 GM |
225 | |
226 | enum mem_type | |
227 | { | |
228 | MEM_TYPE_NON_LISP, | |
229 | MEM_TYPE_BUFFER, | |
230 | MEM_TYPE_CONS, | |
231 | MEM_TYPE_STRING, | |
232 | MEM_TYPE_MISC, | |
233 | MEM_TYPE_SYMBOL, | |
234 | MEM_TYPE_FLOAT, | |
914adc42 DA |
235 | /* Since all non-bool pseudovectors are small enough to be |
236 | allocated from vector blocks, this memory type denotes | |
237 | large regular vectors and large bool pseudovectors. */ | |
f3372c87 DA |
238 | MEM_TYPE_VECTORLIKE, |
239 | /* Special type to denote vector blocks. */ | |
35aaa1ea DA |
240 | MEM_TYPE_VECTOR_BLOCK, |
241 | /* Special type to denote reserved memory. */ | |
242 | MEM_TYPE_SPARE | |
34400008 GM |
243 | }; |
244 | ||
877935b1 | 245 | #if GC_MARK_STACK || defined GC_MALLOC_CHECK |
0b378936 | 246 | |
0b378936 GM |
247 | /* A unique object in pure space used to make some Lisp objects |
248 | on free lists recognizable in O(1). */ | |
249 | ||
d3d47262 | 250 | static Lisp_Object Vdead; |
ca78dc43 | 251 | #define DEADP(x) EQ (x, Vdead) |
0b378936 | 252 | |
877935b1 GM |
253 | #ifdef GC_MALLOC_CHECK |
254 | ||
255 | enum mem_type allocated_mem_type; | |
877935b1 GM |
256 | |
257 | #endif /* GC_MALLOC_CHECK */ | |
258 | ||
259 | /* A node in the red-black tree describing allocated memory containing | |
260 | Lisp data. Each such block is recorded with its start and end | |
261 | address when it is allocated, and removed from the tree when it | |
262 | is freed. | |
263 | ||
264 | A red-black tree is a balanced binary tree with the following | |
265 | properties: | |
266 | ||
267 | 1. Every node is either red or black. | |
268 | 2. Every leaf is black. | |
269 | 3. If a node is red, then both of its children are black. | |
270 | 4. Every simple path from a node to a descendant leaf contains | |
271 | the same number of black nodes. | |
272 | 5. The root is always black. | |
273 | ||
274 | When nodes are inserted into the tree, or deleted from the tree, | |
275 | the tree is "fixed" so that these properties are always true. | |
276 | ||
277 | A red-black tree with N internal nodes has height at most 2 | |
278 | log(N+1). Searches, insertions and deletions are done in O(log N). | |
279 | Please see a text book about data structures for a detailed | |
280 | description of red-black trees. Any book worth its salt should | |
281 | describe them. */ | |
282 | ||
283 | struct mem_node | |
284 | { | |
9f7d9210 RS |
285 | /* Children of this node. These pointers are never NULL. When there |
286 | is no child, the value is MEM_NIL, which points to a dummy node. */ | |
287 | struct mem_node *left, *right; | |
288 | ||
289 | /* The parent of this node. In the root node, this is NULL. */ | |
290 | struct mem_node *parent; | |
877935b1 GM |
291 | |
292 | /* Start and end of allocated region. */ | |
293 | void *start, *end; | |
294 | ||
295 | /* Node color. */ | |
296 | enum {MEM_BLACK, MEM_RED} color; | |
177c0ea7 | 297 | |
877935b1 GM |
298 | /* Memory type. */ |
299 | enum mem_type type; | |
300 | }; | |
301 | ||
302 | /* Base address of stack. Set in main. */ | |
303 | ||
304 | Lisp_Object *stack_base; | |
305 | ||
306 | /* Root of the tree describing allocated Lisp memory. */ | |
307 | ||
308 | static struct mem_node *mem_root; | |
309 | ||
ece93c02 GM |
310 | /* Lowest and highest known address in the heap. */ |
311 | ||
312 | static void *min_heap_address, *max_heap_address; | |
313 | ||
877935b1 GM |
314 | /* Sentinel node of the tree. */ |
315 | ||
316 | static struct mem_node mem_z; | |
317 | #define MEM_NIL &mem_z | |
318 | ||
f57e2426 J |
319 | static struct mem_node *mem_insert (void *, void *, enum mem_type); |
320 | static void mem_insert_fixup (struct mem_node *); | |
321 | static void mem_rotate_left (struct mem_node *); | |
322 | static void mem_rotate_right (struct mem_node *); | |
323 | static void mem_delete (struct mem_node *); | |
324 | static void mem_delete_fixup (struct mem_node *); | |
b0ab8123 | 325 | static struct mem_node *mem_find (void *); |
34400008 | 326 | |
877935b1 | 327 | #endif /* GC_MARK_STACK || GC_MALLOC_CHECK */ |
34400008 | 328 | |
ca78dc43 PE |
329 | #ifndef DEADP |
330 | # define DEADP(x) 0 | |
331 | #endif | |
332 | ||
1f0b3fd2 GM |
333 | /* Recording what needs to be marked for gc. */ |
334 | ||
335 | struct gcpro *gcprolist; | |
336 | ||
379b98b1 PE |
337 | /* Addresses of staticpro'd variables. Initialize it to a nonzero |
338 | value; otherwise some compilers put it into BSS. */ | |
1f0b3fd2 | 339 | |
4195afc3 | 340 | enum { NSTATICS = 2048 }; |
d3d47262 | 341 | static Lisp_Object *staticvec[NSTATICS] = {&Vpurify_flag}; |
1f0b3fd2 GM |
342 | |
343 | /* Index of next unused slot in staticvec. */ | |
344 | ||
fff62aa9 | 345 | static int staticidx; |
1f0b3fd2 | 346 | |
261cb4bb | 347 | static void *pure_alloc (size_t, int); |
1f0b3fd2 GM |
348 | |
349 | ||
350 | /* Value is SZ rounded up to the next multiple of ALIGNMENT. | |
351 | ALIGNMENT must be a power of 2. */ | |
352 | ||
ab6780cd | 353 | #define ALIGN(ptr, ALIGNMENT) \ |
261cb4bb PE |
354 | ((void *) (((uintptr_t) (ptr) + (ALIGNMENT) - 1) \ |
355 | & ~ ((ALIGNMENT) - 1))) | |
1f0b3fd2 | 356 | |
84575e67 PE |
357 | static void |
358 | XFLOAT_INIT (Lisp_Object f, double n) | |
359 | { | |
360 | XFLOAT (f)->u.data = n; | |
361 | } | |
ece93c02 | 362 | |
7146af97 | 363 | \f |
34400008 GM |
364 | /************************************************************************ |
365 | Malloc | |
366 | ************************************************************************/ | |
367 | ||
4455ad75 | 368 | /* Function malloc calls this if it finds we are near exhausting storage. */ |
d457598b AS |
369 | |
370 | void | |
a8fe7202 | 371 | malloc_warning (const char *str) |
7146af97 JB |
372 | { |
373 | pending_malloc_warning = str; | |
374 | } | |
375 | ||
34400008 | 376 | |
4455ad75 | 377 | /* Display an already-pending malloc warning. */ |
34400008 | 378 | |
d457598b | 379 | void |
971de7fb | 380 | display_malloc_warning (void) |
7146af97 | 381 | { |
4455ad75 RS |
382 | call3 (intern ("display-warning"), |
383 | intern ("alloc"), | |
384 | build_string (pending_malloc_warning), | |
385 | intern ("emergency")); | |
7146af97 | 386 | pending_malloc_warning = 0; |
7146af97 | 387 | } |
49efed3a | 388 | \f |
276cbe5a RS |
389 | /* Called if we can't allocate relocatable space for a buffer. */ |
390 | ||
391 | void | |
d311d28c | 392 | buffer_memory_full (ptrdiff_t nbytes) |
276cbe5a | 393 | { |
2e471eb5 GM |
394 | /* If buffers use the relocating allocator, no need to free |
395 | spare_memory, because we may have plenty of malloc space left | |
396 | that we could get, and if we don't, the malloc that fails will | |
397 | itself cause spare_memory to be freed. If buffers don't use the | |
398 | relocating allocator, treat this like any other failing | |
399 | malloc. */ | |
276cbe5a RS |
400 | |
401 | #ifndef REL_ALLOC | |
531b0165 | 402 | memory_full (nbytes); |
d9df6f40 | 403 | #else |
2e471eb5 GM |
404 | /* This used to call error, but if we've run out of memory, we could |
405 | get infinite recursion trying to build the string. */ | |
9b306d37 | 406 | xsignal (Qnil, Vmemory_signal_data); |
d9df6f40 | 407 | #endif |
7146af97 JB |
408 | } |
409 | ||
f3372c87 DA |
410 | /* A common multiple of the positive integers A and B. Ideally this |
411 | would be the least common multiple, but there's no way to do that | |
412 | as a constant expression in C, so do the best that we can easily do. */ | |
413 | #define COMMON_MULTIPLE(a, b) \ | |
414 | ((a) % (b) == 0 ? (a) : (b) % (a) == 0 ? (b) : (a) * (b)) | |
34400008 | 415 | |
c9d624c6 | 416 | #ifndef XMALLOC_OVERRUN_CHECK |
903fe15d | 417 | #define XMALLOC_OVERRUN_CHECK_OVERHEAD 0 |
c9d624c6 | 418 | #else |
212f33f1 | 419 | |
903fe15d PE |
420 | /* Check for overrun in malloc'ed buffers by wrapping a header and trailer |
421 | around each block. | |
bdbed949 | 422 | |
f701dc2a PE |
423 | The header consists of XMALLOC_OVERRUN_CHECK_SIZE fixed bytes |
424 | followed by XMALLOC_OVERRUN_SIZE_SIZE bytes containing the original | |
425 | block size in little-endian order. The trailer consists of | |
426 | XMALLOC_OVERRUN_CHECK_SIZE fixed bytes. | |
bdbed949 KS |
427 | |
428 | The header is used to detect whether this block has been allocated | |
f701dc2a PE |
429 | through these functions, as some low-level libc functions may |
430 | bypass the malloc hooks. */ | |
bdbed949 | 431 | |
212f33f1 | 432 | #define XMALLOC_OVERRUN_CHECK_SIZE 16 |
903fe15d | 433 | #define XMALLOC_OVERRUN_CHECK_OVERHEAD \ |
38532ce6 PE |
434 | (2 * XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE) |
435 | ||
436 | /* Define XMALLOC_OVERRUN_SIZE_SIZE so that (1) it's large enough to | |
f701dc2a PE |
437 | hold a size_t value and (2) the header size is a multiple of the |
438 | alignment that Emacs needs for C types and for USE_LSB_TAG. */ | |
439 | #define XMALLOC_BASE_ALIGNMENT \ | |
e32a5799 | 440 | alignof (union { long double d; intmax_t i; void *p; }) |
f3372c87 | 441 | |
bfe3e0a2 | 442 | #if USE_LSB_TAG |
f701dc2a | 443 | # define XMALLOC_HEADER_ALIGNMENT \ |
2b90362b | 444 | COMMON_MULTIPLE (GCALIGNMENT, XMALLOC_BASE_ALIGNMENT) |
38532ce6 PE |
445 | #else |
446 | # define XMALLOC_HEADER_ALIGNMENT XMALLOC_BASE_ALIGNMENT | |
447 | #endif | |
448 | #define XMALLOC_OVERRUN_SIZE_SIZE \ | |
f701dc2a PE |
449 | (((XMALLOC_OVERRUN_CHECK_SIZE + sizeof (size_t) \ |
450 | + XMALLOC_HEADER_ALIGNMENT - 1) \ | |
451 | / XMALLOC_HEADER_ALIGNMENT * XMALLOC_HEADER_ALIGNMENT) \ | |
452 | - XMALLOC_OVERRUN_CHECK_SIZE) | |
bdbed949 | 453 | |
903fe15d PE |
454 | static char const xmalloc_overrun_check_header[XMALLOC_OVERRUN_CHECK_SIZE] = |
455 | { '\x9a', '\x9b', '\xae', '\xaf', | |
456 | '\xbf', '\xbe', '\xce', '\xcf', | |
457 | '\xea', '\xeb', '\xec', '\xed', | |
458 | '\xdf', '\xde', '\x9c', '\x9d' }; | |
212f33f1 | 459 | |
903fe15d PE |
460 | static char const xmalloc_overrun_check_trailer[XMALLOC_OVERRUN_CHECK_SIZE] = |
461 | { '\xaa', '\xab', '\xac', '\xad', | |
462 | '\xba', '\xbb', '\xbc', '\xbd', | |
463 | '\xca', '\xcb', '\xcc', '\xcd', | |
464 | '\xda', '\xdb', '\xdc', '\xdd' }; | |
212f33f1 | 465 | |
903fe15d | 466 | /* Insert and extract the block size in the header. */ |
bdbed949 | 467 | |
903fe15d PE |
468 | static void |
469 | xmalloc_put_size (unsigned char *ptr, size_t size) | |
470 | { | |
471 | int i; | |
38532ce6 | 472 | for (i = 0; i < XMALLOC_OVERRUN_SIZE_SIZE; i++) |
903fe15d | 473 | { |
38532ce6 | 474 | *--ptr = size & ((1 << CHAR_BIT) - 1); |
903fe15d PE |
475 | size >>= CHAR_BIT; |
476 | } | |
477 | } | |
bdbed949 | 478 | |
903fe15d PE |
479 | static size_t |
480 | xmalloc_get_size (unsigned char *ptr) | |
481 | { | |
482 | size_t size = 0; | |
483 | int i; | |
38532ce6 PE |
484 | ptr -= XMALLOC_OVERRUN_SIZE_SIZE; |
485 | for (i = 0; i < XMALLOC_OVERRUN_SIZE_SIZE; i++) | |
903fe15d PE |
486 | { |
487 | size <<= CHAR_BIT; | |
488 | size += *ptr++; | |
489 | } | |
490 | return size; | |
491 | } | |
bdbed949 KS |
492 | |
493 | ||
494 | /* Like malloc, but wraps allocated block with header and trailer. */ | |
495 | ||
261cb4bb | 496 | static void * |
e7974947 | 497 | overrun_check_malloc (size_t size) |
212f33f1 | 498 | { |
bdbed949 | 499 | register unsigned char *val; |
0caaedb1 | 500 | if (SIZE_MAX - XMALLOC_OVERRUN_CHECK_OVERHEAD < size) |
1088b922 | 501 | emacs_abort (); |
212f33f1 | 502 | |
0caaedb1 PE |
503 | val = malloc (size + XMALLOC_OVERRUN_CHECK_OVERHEAD); |
504 | if (val) | |
212f33f1 | 505 | { |
903fe15d | 506 | memcpy (val, xmalloc_overrun_check_header, XMALLOC_OVERRUN_CHECK_SIZE); |
38532ce6 | 507 | val += XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
903fe15d | 508 | xmalloc_put_size (val, size); |
72af86bd AS |
509 | memcpy (val + size, xmalloc_overrun_check_trailer, |
510 | XMALLOC_OVERRUN_CHECK_SIZE); | |
212f33f1 | 511 | } |
261cb4bb | 512 | return val; |
212f33f1 KS |
513 | } |
514 | ||
bdbed949 KS |
515 | |
516 | /* Like realloc, but checks old block for overrun, and wraps new block | |
517 | with header and trailer. */ | |
518 | ||
261cb4bb PE |
519 | static void * |
520 | overrun_check_realloc (void *block, size_t size) | |
212f33f1 | 521 | { |
e7974947 | 522 | register unsigned char *val = (unsigned char *) block; |
0caaedb1 | 523 | if (SIZE_MAX - XMALLOC_OVERRUN_CHECK_OVERHEAD < size) |
1088b922 | 524 | emacs_abort (); |
212f33f1 KS |
525 | |
526 | if (val | |
72af86bd | 527 | && memcmp (xmalloc_overrun_check_header, |
38532ce6 | 528 | val - XMALLOC_OVERRUN_CHECK_SIZE - XMALLOC_OVERRUN_SIZE_SIZE, |
903fe15d | 529 | XMALLOC_OVERRUN_CHECK_SIZE) == 0) |
212f33f1 | 530 | { |
903fe15d | 531 | size_t osize = xmalloc_get_size (val); |
72af86bd AS |
532 | if (memcmp (xmalloc_overrun_check_trailer, val + osize, |
533 | XMALLOC_OVERRUN_CHECK_SIZE)) | |
1088b922 | 534 | emacs_abort (); |
72af86bd | 535 | memset (val + osize, 0, XMALLOC_OVERRUN_CHECK_SIZE); |
38532ce6 PE |
536 | val -= XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
537 | memset (val, 0, XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE); | |
212f33f1 KS |
538 | } |
539 | ||
0caaedb1 | 540 | val = realloc (val, size + XMALLOC_OVERRUN_CHECK_OVERHEAD); |
212f33f1 | 541 | |
0caaedb1 | 542 | if (val) |
212f33f1 | 543 | { |
903fe15d | 544 | memcpy (val, xmalloc_overrun_check_header, XMALLOC_OVERRUN_CHECK_SIZE); |
38532ce6 | 545 | val += XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
903fe15d | 546 | xmalloc_put_size (val, size); |
72af86bd AS |
547 | memcpy (val + size, xmalloc_overrun_check_trailer, |
548 | XMALLOC_OVERRUN_CHECK_SIZE); | |
212f33f1 | 549 | } |
261cb4bb | 550 | return val; |
212f33f1 KS |
551 | } |
552 | ||
bdbed949 KS |
553 | /* Like free, but checks block for overrun. */ |
554 | ||
2538aa2f | 555 | static void |
261cb4bb | 556 | overrun_check_free (void *block) |
212f33f1 | 557 | { |
e7974947 | 558 | unsigned char *val = (unsigned char *) block; |
212f33f1 KS |
559 | |
560 | if (val | |
72af86bd | 561 | && memcmp (xmalloc_overrun_check_header, |
38532ce6 | 562 | val - XMALLOC_OVERRUN_CHECK_SIZE - XMALLOC_OVERRUN_SIZE_SIZE, |
903fe15d | 563 | XMALLOC_OVERRUN_CHECK_SIZE) == 0) |
212f33f1 | 564 | { |
903fe15d | 565 | size_t osize = xmalloc_get_size (val); |
72af86bd AS |
566 | if (memcmp (xmalloc_overrun_check_trailer, val + osize, |
567 | XMALLOC_OVERRUN_CHECK_SIZE)) | |
1088b922 | 568 | emacs_abort (); |
454d7973 | 569 | #ifdef XMALLOC_CLEAR_FREE_MEMORY |
38532ce6 | 570 | val -= XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
903fe15d | 571 | memset (val, 0xff, osize + XMALLOC_OVERRUN_CHECK_OVERHEAD); |
454d7973 | 572 | #else |
72af86bd | 573 | memset (val + osize, 0, XMALLOC_OVERRUN_CHECK_SIZE); |
38532ce6 PE |
574 | val -= XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE; |
575 | memset (val, 0, XMALLOC_OVERRUN_CHECK_SIZE + XMALLOC_OVERRUN_SIZE_SIZE); | |
454d7973 | 576 | #endif |
212f33f1 KS |
577 | } |
578 | ||
579 | free (val); | |
580 | } | |
581 | ||
582 | #undef malloc | |
583 | #undef realloc | |
584 | #undef free | |
585 | #define malloc overrun_check_malloc | |
586 | #define realloc overrun_check_realloc | |
587 | #define free overrun_check_free | |
588 | #endif | |
589 | ||
0caaedb1 PE |
590 | /* If compiled with XMALLOC_BLOCK_INPUT_CHECK, define a symbol |
591 | BLOCK_INPUT_IN_MEMORY_ALLOCATORS that is visible to the debugger. | |
592 | If that variable is set, block input while in one of Emacs's memory | |
593 | allocation functions. There should be no need for this debugging | |
594 | option, since signal handlers do not allocate memory, but Emacs | |
595 | formerly allocated memory in signal handlers and this compile-time | |
596 | option remains as a way to help debug the issue should it rear its | |
597 | ugly head again. */ | |
598 | #ifdef XMALLOC_BLOCK_INPUT_CHECK | |
599 | bool block_input_in_memory_allocators EXTERNALLY_VISIBLE; | |
600 | static void | |
601 | malloc_block_input (void) | |
602 | { | |
603 | if (block_input_in_memory_allocators) | |
4d7e6e51 | 604 | block_input (); |
0caaedb1 PE |
605 | } |
606 | static void | |
607 | malloc_unblock_input (void) | |
608 | { | |
609 | if (block_input_in_memory_allocators) | |
4d7e6e51 | 610 | unblock_input (); |
0caaedb1 PE |
611 | } |
612 | # define MALLOC_BLOCK_INPUT malloc_block_input () | |
613 | # define MALLOC_UNBLOCK_INPUT malloc_unblock_input () | |
dafc79fa | 614 | #else |
0caaedb1 PE |
615 | # define MALLOC_BLOCK_INPUT ((void) 0) |
616 | # define MALLOC_UNBLOCK_INPUT ((void) 0) | |
dafc79fa | 617 | #endif |
bdbed949 | 618 | |
3a880af4 SM |
619 | #define MALLOC_PROBE(size) \ |
620 | do { \ | |
621 | if (profiler_memory_running) \ | |
622 | malloc_probe (size); \ | |
623 | } while (0) | |
624 | ||
625 | ||
34400008 | 626 | /* Like malloc but check for no memory and block interrupt input.. */ |
7146af97 | 627 | |
261cb4bb | 628 | void * |
971de7fb | 629 | xmalloc (size_t size) |
7146af97 | 630 | { |
261cb4bb | 631 | void *val; |
7146af97 | 632 | |
dafc79fa | 633 | MALLOC_BLOCK_INPUT; |
261cb4bb | 634 | val = malloc (size); |
dafc79fa | 635 | MALLOC_UNBLOCK_INPUT; |
7146af97 | 636 | |
2e471eb5 | 637 | if (!val && size) |
531b0165 | 638 | memory_full (size); |
c2d7786e | 639 | MALLOC_PROBE (size); |
7146af97 JB |
640 | return val; |
641 | } | |
642 | ||
23f86fce DA |
643 | /* Like the above, but zeroes out the memory just allocated. */ |
644 | ||
645 | void * | |
646 | xzalloc (size_t size) | |
647 | { | |
648 | void *val; | |
649 | ||
650 | MALLOC_BLOCK_INPUT; | |
651 | val = malloc (size); | |
652 | MALLOC_UNBLOCK_INPUT; | |
653 | ||
654 | if (!val && size) | |
655 | memory_full (size); | |
656 | memset (val, 0, size); | |
c2d7786e | 657 | MALLOC_PROBE (size); |
23f86fce DA |
658 | return val; |
659 | } | |
34400008 GM |
660 | |
661 | /* Like realloc but check for no memory and block interrupt input.. */ | |
662 | ||
261cb4bb PE |
663 | void * |
664 | xrealloc (void *block, size_t size) | |
7146af97 | 665 | { |
261cb4bb | 666 | void *val; |
7146af97 | 667 | |
dafc79fa | 668 | MALLOC_BLOCK_INPUT; |
56d2031b JB |
669 | /* We must call malloc explicitly when BLOCK is 0, since some |
670 | reallocs don't do this. */ | |
671 | if (! block) | |
261cb4bb | 672 | val = malloc (size); |
f048679d | 673 | else |
261cb4bb | 674 | val = realloc (block, size); |
dafc79fa | 675 | MALLOC_UNBLOCK_INPUT; |
7146af97 | 676 | |
531b0165 PE |
677 | if (!val && size) |
678 | memory_full (size); | |
c2d7786e | 679 | MALLOC_PROBE (size); |
7146af97 JB |
680 | return val; |
681 | } | |
9ac0d9e0 | 682 | |
34400008 | 683 | |
005ca5c7 | 684 | /* Like free but block interrupt input. */ |
34400008 | 685 | |
9ac0d9e0 | 686 | void |
261cb4bb | 687 | xfree (void *block) |
9ac0d9e0 | 688 | { |
70fdbb46 JM |
689 | if (!block) |
690 | return; | |
dafc79fa | 691 | MALLOC_BLOCK_INPUT; |
9ac0d9e0 | 692 | free (block); |
dafc79fa | 693 | MALLOC_UNBLOCK_INPUT; |
24d8a105 | 694 | /* We don't call refill_memory_reserve here |
0caaedb1 | 695 | because in practice the call in r_alloc_free seems to suffice. */ |
9ac0d9e0 JB |
696 | } |
697 | ||
c8099634 | 698 | |
0065d054 PE |
699 | /* Other parts of Emacs pass large int values to allocator functions |
700 | expecting ptrdiff_t. This is portable in practice, but check it to | |
701 | be safe. */ | |
702 | verify (INT_MAX <= PTRDIFF_MAX); | |
703 | ||
704 | ||
705 | /* Allocate an array of NITEMS items, each of size ITEM_SIZE. | |
706 | Signal an error on memory exhaustion, and block interrupt input. */ | |
707 | ||
708 | void * | |
709 | xnmalloc (ptrdiff_t nitems, ptrdiff_t item_size) | |
710 | { | |
a54e2c05 | 711 | eassert (0 <= nitems && 0 < item_size); |
0065d054 PE |
712 | if (min (PTRDIFF_MAX, SIZE_MAX) / item_size < nitems) |
713 | memory_full (SIZE_MAX); | |
714 | return xmalloc (nitems * item_size); | |
715 | } | |
716 | ||
717 | ||
718 | /* Reallocate an array PA to make it of NITEMS items, each of size ITEM_SIZE. | |
719 | Signal an error on memory exhaustion, and block interrupt input. */ | |
720 | ||
721 | void * | |
722 | xnrealloc (void *pa, ptrdiff_t nitems, ptrdiff_t item_size) | |
723 | { | |
a54e2c05 | 724 | eassert (0 <= nitems && 0 < item_size); |
0065d054 PE |
725 | if (min (PTRDIFF_MAX, SIZE_MAX) / item_size < nitems) |
726 | memory_full (SIZE_MAX); | |
727 | return xrealloc (pa, nitems * item_size); | |
728 | } | |
729 | ||
730 | ||
731 | /* Grow PA, which points to an array of *NITEMS items, and return the | |
732 | location of the reallocated array, updating *NITEMS to reflect its | |
733 | new size. The new array will contain at least NITEMS_INCR_MIN more | |
734 | items, but will not contain more than NITEMS_MAX items total. | |
735 | ITEM_SIZE is the size of each item, in bytes. | |
736 | ||
737 | ITEM_SIZE and NITEMS_INCR_MIN must be positive. *NITEMS must be | |
738 | nonnegative. If NITEMS_MAX is -1, it is treated as if it were | |
739 | infinity. | |
740 | ||
741 | If PA is null, then allocate a new array instead of reallocating | |
2dd2e622 | 742 | the old one. |
0065d054 PE |
743 | |
744 | Block interrupt input as needed. If memory exhaustion occurs, set | |
745 | *NITEMS to zero if PA is null, and signal an error (i.e., do not | |
2dd2e622 PE |
746 | return). |
747 | ||
748 | Thus, to grow an array A without saving its old contents, do | |
749 | { xfree (A); A = NULL; A = xpalloc (NULL, &AITEMS, ...); }. | |
750 | The A = NULL avoids a dangling pointer if xpalloc exhausts memory | |
751 | and signals an error, and later this code is reexecuted and | |
752 | attempts to free A. */ | |
0065d054 PE |
753 | |
754 | void * | |
755 | xpalloc (void *pa, ptrdiff_t *nitems, ptrdiff_t nitems_incr_min, | |
756 | ptrdiff_t nitems_max, ptrdiff_t item_size) | |
757 | { | |
758 | /* The approximate size to use for initial small allocation | |
759 | requests. This is the largest "small" request for the GNU C | |
760 | library malloc. */ | |
761 | enum { DEFAULT_MXFAST = 64 * sizeof (size_t) / 4 }; | |
762 | ||
763 | /* If the array is tiny, grow it to about (but no greater than) | |
764 | DEFAULT_MXFAST bytes. Otherwise, grow it by about 50%. */ | |
765 | ptrdiff_t n = *nitems; | |
766 | ptrdiff_t tiny_max = DEFAULT_MXFAST / item_size - n; | |
767 | ptrdiff_t half_again = n >> 1; | |
768 | ptrdiff_t incr_estimate = max (tiny_max, half_again); | |
769 | ||
770 | /* Adjust the increment according to three constraints: NITEMS_INCR_MIN, | |
771 | NITEMS_MAX, and what the C language can represent safely. */ | |
772 | ptrdiff_t C_language_max = min (PTRDIFF_MAX, SIZE_MAX) / item_size; | |
773 | ptrdiff_t n_max = (0 <= nitems_max && nitems_max < C_language_max | |
774 | ? nitems_max : C_language_max); | |
775 | ptrdiff_t nitems_incr_max = n_max - n; | |
776 | ptrdiff_t incr = max (nitems_incr_min, min (incr_estimate, nitems_incr_max)); | |
777 | ||
7216e43b | 778 | eassert (0 < item_size && 0 < nitems_incr_min && 0 <= n && -1 <= nitems_max); |
0065d054 PE |
779 | if (! pa) |
780 | *nitems = 0; | |
781 | if (nitems_incr_max < incr) | |
782 | memory_full (SIZE_MAX); | |
783 | n += incr; | |
784 | pa = xrealloc (pa, n * item_size); | |
785 | *nitems = n; | |
786 | return pa; | |
787 | } | |
788 | ||
789 | ||
dca7c6a8 GM |
790 | /* Like strdup, but uses xmalloc. */ |
791 | ||
792 | char * | |
971de7fb | 793 | xstrdup (const char *s) |
dca7c6a8 | 794 | { |
9acc1074 | 795 | ptrdiff_t size; |
309f24d1 | 796 | eassert (s); |
9acc1074 PE |
797 | size = strlen (s) + 1; |
798 | return memcpy (xmalloc (size), s, size); | |
dca7c6a8 GM |
799 | } |
800 | ||
5b71542d DA |
801 | /* Like above, but duplicates Lisp string to C string. */ |
802 | ||
803 | char * | |
804 | xlispstrdup (Lisp_Object string) | |
805 | { | |
806 | ptrdiff_t size = SBYTES (string) + 1; | |
807 | return memcpy (xmalloc (size), SSDATA (string), size); | |
808 | } | |
809 | ||
5745a7df PE |
810 | /* Like putenv, but (1) use the equivalent of xmalloc and (2) the |
811 | argument is a const pointer. */ | |
812 | ||
813 | void | |
814 | xputenv (char const *string) | |
815 | { | |
816 | if (putenv ((char *) string) != 0) | |
817 | memory_full (0); | |
818 | } | |
dca7c6a8 | 819 | |
98c6f1e3 PE |
820 | /* Return a newly allocated memory block of SIZE bytes, remembering |
821 | to free it when unwinding. */ | |
822 | void * | |
823 | record_xmalloc (size_t size) | |
824 | { | |
825 | void *p = xmalloc (size); | |
27e498e6 | 826 | record_unwind_protect_ptr (xfree, p); |
98c6f1e3 PE |
827 | return p; |
828 | } | |
829 | ||
f61bef8b | 830 | |
34400008 GM |
831 | /* Like malloc but used for allocating Lisp data. NBYTES is the |
832 | number of bytes to allocate, TYPE describes the intended use of the | |
91af3942 | 833 | allocated memory block (for strings, for conses, ...). */ |
34400008 | 834 | |
bfe3e0a2 PE |
835 | #if ! USE_LSB_TAG |
836 | void *lisp_malloc_loser EXTERNALLY_VISIBLE; | |
212f33f1 | 837 | #endif |
918a23a7 | 838 | |
261cb4bb | 839 | static void * |
971de7fb | 840 | lisp_malloc (size_t nbytes, enum mem_type type) |
c8099634 | 841 | { |
34400008 | 842 | register void *val; |
c8099634 | 843 | |
dafc79fa | 844 | MALLOC_BLOCK_INPUT; |
877935b1 GM |
845 | |
846 | #ifdef GC_MALLOC_CHECK | |
847 | allocated_mem_type = type; | |
848 | #endif | |
177c0ea7 | 849 | |
38182d90 | 850 | val = malloc (nbytes); |
c8099634 | 851 | |
bfe3e0a2 | 852 | #if ! USE_LSB_TAG |
918a23a7 RS |
853 | /* If the memory just allocated cannot be addressed thru a Lisp |
854 | object's pointer, and it needs to be, | |
855 | that's equivalent to running out of memory. */ | |
856 | if (val && type != MEM_TYPE_NON_LISP) | |
857 | { | |
858 | Lisp_Object tem; | |
859 | XSETCONS (tem, (char *) val + nbytes - 1); | |
860 | if ((char *) XCONS (tem) != (char *) val + nbytes - 1) | |
861 | { | |
862 | lisp_malloc_loser = val; | |
863 | free (val); | |
864 | val = 0; | |
865 | } | |
866 | } | |
6b61353c | 867 | #endif |
918a23a7 | 868 | |
877935b1 | 869 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK |
dca7c6a8 | 870 | if (val && type != MEM_TYPE_NON_LISP) |
34400008 GM |
871 | mem_insert (val, (char *) val + nbytes, type); |
872 | #endif | |
177c0ea7 | 873 | |
dafc79fa | 874 | MALLOC_UNBLOCK_INPUT; |
dca7c6a8 | 875 | if (!val && nbytes) |
531b0165 | 876 | memory_full (nbytes); |
c2d7786e | 877 | MALLOC_PROBE (nbytes); |
c8099634 RS |
878 | return val; |
879 | } | |
880 | ||
34400008 GM |
881 | /* Free BLOCK. This must be called to free memory allocated with a |
882 | call to lisp_malloc. */ | |
883 | ||
bf952fb6 | 884 | static void |
261cb4bb | 885 | lisp_free (void *block) |
c8099634 | 886 | { |
dafc79fa | 887 | MALLOC_BLOCK_INPUT; |
c8099634 | 888 | free (block); |
877935b1 | 889 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK |
34400008 GM |
890 | mem_delete (mem_find (block)); |
891 | #endif | |
dafc79fa | 892 | MALLOC_UNBLOCK_INPUT; |
c8099634 | 893 | } |
34400008 | 894 | |
453b951e SM |
895 | /***** Allocation of aligned blocks of memory to store Lisp data. *****/ |
896 | ||
897 | /* The entry point is lisp_align_malloc which returns blocks of at most | |
898 | BLOCK_BYTES and guarantees they are aligned on a BLOCK_ALIGN boundary. */ | |
ab6780cd | 899 | |
b4181b01 KS |
900 | #if defined (HAVE_POSIX_MEMALIGN) && defined (SYSTEM_MALLOC) |
901 | #define USE_POSIX_MEMALIGN 1 | |
902 | #endif | |
ab6780cd SM |
903 | |
904 | /* BLOCK_ALIGN has to be a power of 2. */ | |
905 | #define BLOCK_ALIGN (1 << 10) | |
ab6780cd SM |
906 | |
907 | /* Padding to leave at the end of a malloc'd block. This is to give | |
908 | malloc a chance to minimize the amount of memory wasted to alignment. | |
909 | It should be tuned to the particular malloc library used. | |
19bcad1f SM |
910 | On glibc-2.3.2, malloc never tries to align, so a padding of 0 is best. |
911 | posix_memalign on the other hand would ideally prefer a value of 4 | |
912 | because otherwise, there's 1020 bytes wasted between each ablocks. | |
f501ccb4 SM |
913 | In Emacs, testing shows that those 1020 can most of the time be |
914 | efficiently used by malloc to place other objects, so a value of 0 can | |
915 | still preferable unless you have a lot of aligned blocks and virtually | |
916 | nothing else. */ | |
19bcad1f SM |
917 | #define BLOCK_PADDING 0 |
918 | #define BLOCK_BYTES \ | |
0b432f21 | 919 | (BLOCK_ALIGN - sizeof (struct ablocks *) - BLOCK_PADDING) |
19bcad1f SM |
920 | |
921 | /* Internal data structures and constants. */ | |
922 | ||
ab6780cd SM |
923 | #define ABLOCKS_SIZE 16 |
924 | ||
925 | /* An aligned block of memory. */ | |
926 | struct ablock | |
927 | { | |
928 | union | |
929 | { | |
930 | char payload[BLOCK_BYTES]; | |
931 | struct ablock *next_free; | |
932 | } x; | |
933 | /* `abase' is the aligned base of the ablocks. */ | |
934 | /* It is overloaded to hold the virtual `busy' field that counts | |
935 | the number of used ablock in the parent ablocks. | |
936 | The first ablock has the `busy' field, the others have the `abase' | |
937 | field. To tell the difference, we assume that pointers will have | |
938 | integer values larger than 2 * ABLOCKS_SIZE. The lowest bit of `busy' | |
939 | is used to tell whether the real base of the parent ablocks is `abase' | |
940 | (if not, the word before the first ablock holds a pointer to the | |
941 | real base). */ | |
942 | struct ablocks *abase; | |
943 | /* The padding of all but the last ablock is unused. The padding of | |
944 | the last ablock in an ablocks is not allocated. */ | |
19bcad1f SM |
945 | #if BLOCK_PADDING |
946 | char padding[BLOCK_PADDING]; | |
ebb8d410 | 947 | #endif |
ab6780cd SM |
948 | }; |
949 | ||
950 | /* A bunch of consecutive aligned blocks. */ | |
951 | struct ablocks | |
952 | { | |
953 | struct ablock blocks[ABLOCKS_SIZE]; | |
954 | }; | |
955 | ||
4b5afbb0 | 956 | /* Size of the block requested from malloc or posix_memalign. */ |
19bcad1f | 957 | #define ABLOCKS_BYTES (sizeof (struct ablocks) - BLOCK_PADDING) |
ab6780cd SM |
958 | |
959 | #define ABLOCK_ABASE(block) \ | |
d01a7826 | 960 | (((uintptr_t) (block)->abase) <= (1 + 2 * ABLOCKS_SIZE) \ |
ab6780cd SM |
961 | ? (struct ablocks *)(block) \ |
962 | : (block)->abase) | |
963 | ||
964 | /* Virtual `busy' field. */ | |
965 | #define ABLOCKS_BUSY(abase) ((abase)->blocks[0].abase) | |
966 | ||
967 | /* Pointer to the (not necessarily aligned) malloc block. */ | |
349a4500 | 968 | #ifdef USE_POSIX_MEMALIGN |
19bcad1f SM |
969 | #define ABLOCKS_BASE(abase) (abase) |
970 | #else | |
ab6780cd | 971 | #define ABLOCKS_BASE(abase) \ |
d01a7826 | 972 | (1 & (intptr_t) ABLOCKS_BUSY (abase) ? abase : ((void**)abase)[-1]) |
19bcad1f | 973 | #endif |
ab6780cd SM |
974 | |
975 | /* The list of free ablock. */ | |
976 | static struct ablock *free_ablock; | |
977 | ||
978 | /* Allocate an aligned block of nbytes. | |
979 | Alignment is on a multiple of BLOCK_ALIGN and `nbytes' has to be | |
980 | smaller or equal to BLOCK_BYTES. */ | |
261cb4bb | 981 | static void * |
971de7fb | 982 | lisp_align_malloc (size_t nbytes, enum mem_type type) |
ab6780cd SM |
983 | { |
984 | void *base, *val; | |
985 | struct ablocks *abase; | |
986 | ||
987 | eassert (nbytes <= BLOCK_BYTES); | |
988 | ||
dafc79fa | 989 | MALLOC_BLOCK_INPUT; |
ab6780cd SM |
990 | |
991 | #ifdef GC_MALLOC_CHECK | |
992 | allocated_mem_type = type; | |
993 | #endif | |
994 | ||
995 | if (!free_ablock) | |
996 | { | |
005ca5c7 | 997 | int i; |
d01a7826 | 998 | intptr_t aligned; /* int gets warning casting to 64-bit pointer. */ |
ab6780cd SM |
999 | |
1000 | #ifdef DOUG_LEA_MALLOC | |
1001 | /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed | |
1002 | because mapped region contents are not preserved in | |
1003 | a dumped Emacs. */ | |
1004 | mallopt (M_MMAP_MAX, 0); | |
1005 | #endif | |
1006 | ||
349a4500 | 1007 | #ifdef USE_POSIX_MEMALIGN |
19bcad1f SM |
1008 | { |
1009 | int err = posix_memalign (&base, BLOCK_ALIGN, ABLOCKS_BYTES); | |
ab349c19 RS |
1010 | if (err) |
1011 | base = NULL; | |
1012 | abase = base; | |
19bcad1f SM |
1013 | } |
1014 | #else | |
ab6780cd SM |
1015 | base = malloc (ABLOCKS_BYTES); |
1016 | abase = ALIGN (base, BLOCK_ALIGN); | |
ab349c19 RS |
1017 | #endif |
1018 | ||
6b61353c KH |
1019 | if (base == 0) |
1020 | { | |
dafc79fa | 1021 | MALLOC_UNBLOCK_INPUT; |
531b0165 | 1022 | memory_full (ABLOCKS_BYTES); |
6b61353c | 1023 | } |
ab6780cd SM |
1024 | |
1025 | aligned = (base == abase); | |
1026 | if (!aligned) | |
1027 | ((void**)abase)[-1] = base; | |
1028 | ||
1029 | #ifdef DOUG_LEA_MALLOC | |
1030 | /* Back to a reasonable maximum of mmap'ed areas. */ | |
1031 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); | |
1032 | #endif | |
1033 | ||
bfe3e0a2 | 1034 | #if ! USE_LSB_TAG |
8f924df7 KH |
1035 | /* If the memory just allocated cannot be addressed thru a Lisp |
1036 | object's pointer, and it needs to be, that's equivalent to | |
1037 | running out of memory. */ | |
1038 | if (type != MEM_TYPE_NON_LISP) | |
1039 | { | |
1040 | Lisp_Object tem; | |
1041 | char *end = (char *) base + ABLOCKS_BYTES - 1; | |
1042 | XSETCONS (tem, end); | |
1043 | if ((char *) XCONS (tem) != end) | |
1044 | { | |
1045 | lisp_malloc_loser = base; | |
1046 | free (base); | |
dafc79fa | 1047 | MALLOC_UNBLOCK_INPUT; |
531b0165 | 1048 | memory_full (SIZE_MAX); |
8f924df7 KH |
1049 | } |
1050 | } | |
6b61353c | 1051 | #endif |
8f924df7 | 1052 | |
ab6780cd | 1053 | /* Initialize the blocks and put them on the free list. |
453b951e | 1054 | If `base' was not properly aligned, we can't use the last block. */ |
ab6780cd SM |
1055 | for (i = 0; i < (aligned ? ABLOCKS_SIZE : ABLOCKS_SIZE - 1); i++) |
1056 | { | |
1057 | abase->blocks[i].abase = abase; | |
1058 | abase->blocks[i].x.next_free = free_ablock; | |
1059 | free_ablock = &abase->blocks[i]; | |
1060 | } | |
8ac068ac | 1061 | ABLOCKS_BUSY (abase) = (struct ablocks *) aligned; |
ab6780cd | 1062 | |
d01a7826 | 1063 | eassert (0 == ((uintptr_t) abase) % BLOCK_ALIGN); |
ab6780cd SM |
1064 | eassert (ABLOCK_ABASE (&abase->blocks[3]) == abase); /* 3 is arbitrary */ |
1065 | eassert (ABLOCK_ABASE (&abase->blocks[0]) == abase); | |
1066 | eassert (ABLOCKS_BASE (abase) == base); | |
d01a7826 | 1067 | eassert (aligned == (intptr_t) ABLOCKS_BUSY (abase)); |
ab6780cd SM |
1068 | } |
1069 | ||
1070 | abase = ABLOCK_ABASE (free_ablock); | |
8ac068ac | 1071 | ABLOCKS_BUSY (abase) = |
d01a7826 | 1072 | (struct ablocks *) (2 + (intptr_t) ABLOCKS_BUSY (abase)); |
ab6780cd SM |
1073 | val = free_ablock; |
1074 | free_ablock = free_ablock->x.next_free; | |
1075 | ||
ab6780cd | 1076 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK |
3687c2ef | 1077 | if (type != MEM_TYPE_NON_LISP) |
ab6780cd SM |
1078 | mem_insert (val, (char *) val + nbytes, type); |
1079 | #endif | |
1080 | ||
dafc79fa | 1081 | MALLOC_UNBLOCK_INPUT; |
ab6780cd | 1082 | |
c2d7786e TM |
1083 | MALLOC_PROBE (nbytes); |
1084 | ||
d01a7826 | 1085 | eassert (0 == ((uintptr_t) val) % BLOCK_ALIGN); |
ab6780cd SM |
1086 | return val; |
1087 | } | |
1088 | ||
1089 | static void | |
261cb4bb | 1090 | lisp_align_free (void *block) |
ab6780cd SM |
1091 | { |
1092 | struct ablock *ablock = block; | |
1093 | struct ablocks *abase = ABLOCK_ABASE (ablock); | |
1094 | ||
dafc79fa | 1095 | MALLOC_BLOCK_INPUT; |
ab6780cd SM |
1096 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK |
1097 | mem_delete (mem_find (block)); | |
1098 | #endif | |
1099 | /* Put on free list. */ | |
1100 | ablock->x.next_free = free_ablock; | |
1101 | free_ablock = ablock; | |
1102 | /* Update busy count. */ | |
453b951e SM |
1103 | ABLOCKS_BUSY (abase) |
1104 | = (struct ablocks *) (-2 + (intptr_t) ABLOCKS_BUSY (abase)); | |
d2db1c32 | 1105 | |
d01a7826 | 1106 | if (2 > (intptr_t) ABLOCKS_BUSY (abase)) |
ab6780cd | 1107 | { /* All the blocks are free. */ |
d01a7826 | 1108 | int i = 0, aligned = (intptr_t) ABLOCKS_BUSY (abase); |
ab6780cd SM |
1109 | struct ablock **tem = &free_ablock; |
1110 | struct ablock *atop = &abase->blocks[aligned ? ABLOCKS_SIZE : ABLOCKS_SIZE - 1]; | |
1111 | ||
1112 | while (*tem) | |
1113 | { | |
1114 | if (*tem >= (struct ablock *) abase && *tem < atop) | |
1115 | { | |
1116 | i++; | |
1117 | *tem = (*tem)->x.next_free; | |
1118 | } | |
1119 | else | |
1120 | tem = &(*tem)->x.next_free; | |
1121 | } | |
1122 | eassert ((aligned & 1) == aligned); | |
1123 | eassert (i == (aligned ? ABLOCKS_SIZE : ABLOCKS_SIZE - 1)); | |
349a4500 | 1124 | #ifdef USE_POSIX_MEMALIGN |
d01a7826 | 1125 | eassert ((uintptr_t) ABLOCKS_BASE (abase) % BLOCK_ALIGN == 0); |
cfb2f32e | 1126 | #endif |
ab6780cd SM |
1127 | free (ABLOCKS_BASE (abase)); |
1128 | } | |
dafc79fa | 1129 | MALLOC_UNBLOCK_INPUT; |
ab6780cd | 1130 | } |
3ef06d12 | 1131 | |
9ac0d9e0 | 1132 | \f |
2e471eb5 GM |
1133 | /*********************************************************************** |
1134 | Interval Allocation | |
1135 | ***********************************************************************/ | |
1a4f1e2c | 1136 | |
34400008 GM |
1137 | /* Number of intervals allocated in an interval_block structure. |
1138 | The 1020 is 1024 minus malloc overhead. */ | |
1139 | ||
d5e35230 JA |
1140 | #define INTERVAL_BLOCK_SIZE \ |
1141 | ((1020 - sizeof (struct interval_block *)) / sizeof (struct interval)) | |
1142 | ||
bad98418 | 1143 | /* Intervals are allocated in chunks in the form of an interval_block |
34400008 GM |
1144 | structure. */ |
1145 | ||
d5e35230 | 1146 | struct interval_block |
2e471eb5 | 1147 | { |
6b61353c | 1148 | /* Place `intervals' first, to preserve alignment. */ |
2e471eb5 | 1149 | struct interval intervals[INTERVAL_BLOCK_SIZE]; |
6b61353c | 1150 | struct interval_block *next; |
2e471eb5 | 1151 | }; |
d5e35230 | 1152 | |
34400008 GM |
1153 | /* Current interval block. Its `next' pointer points to older |
1154 | blocks. */ | |
1155 | ||
d3d47262 | 1156 | static struct interval_block *interval_block; |
34400008 GM |
1157 | |
1158 | /* Index in interval_block above of the next unused interval | |
1159 | structure. */ | |
1160 | ||
fff62aa9 | 1161 | static int interval_block_index = INTERVAL_BLOCK_SIZE; |
34400008 GM |
1162 | |
1163 | /* Number of free and live intervals. */ | |
1164 | ||
c0c5c8ae | 1165 | static EMACS_INT total_free_intervals, total_intervals; |
d5e35230 | 1166 | |
34400008 GM |
1167 | /* List of free intervals. */ |
1168 | ||
244ed907 | 1169 | static INTERVAL interval_free_list; |
d5e35230 | 1170 | |
34400008 | 1171 | /* Return a new interval. */ |
d5e35230 JA |
1172 | |
1173 | INTERVAL | |
971de7fb | 1174 | make_interval (void) |
d5e35230 JA |
1175 | { |
1176 | INTERVAL val; | |
1177 | ||
dafc79fa | 1178 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 1179 | |
d5e35230 JA |
1180 | if (interval_free_list) |
1181 | { | |
1182 | val = interval_free_list; | |
439d5cb4 | 1183 | interval_free_list = INTERVAL_PARENT (interval_free_list); |
d5e35230 JA |
1184 | } |
1185 | else | |
1186 | { | |
1187 | if (interval_block_index == INTERVAL_BLOCK_SIZE) | |
1188 | { | |
38182d90 PE |
1189 | struct interval_block *newi |
1190 | = lisp_malloc (sizeof *newi, MEM_TYPE_NON_LISP); | |
d5e35230 | 1191 | |
d5e35230 JA |
1192 | newi->next = interval_block; |
1193 | interval_block = newi; | |
1194 | interval_block_index = 0; | |
3900d5de | 1195 | total_free_intervals += INTERVAL_BLOCK_SIZE; |
d5e35230 JA |
1196 | } |
1197 | val = &interval_block->intervals[interval_block_index++]; | |
1198 | } | |
e2984df0 | 1199 | |
dafc79fa | 1200 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 1201 | |
d5e35230 | 1202 | consing_since_gc += sizeof (struct interval); |
310ea200 | 1203 | intervals_consed++; |
3900d5de | 1204 | total_free_intervals--; |
d5e35230 | 1205 | RESET_INTERVAL (val); |
2336fe58 | 1206 | val->gcmarkbit = 0; |
d5e35230 JA |
1207 | return val; |
1208 | } | |
1209 | ||
34400008 | 1210 | |
ee28be33 | 1211 | /* Mark Lisp objects in interval I. */ |
d5e35230 JA |
1212 | |
1213 | static void | |
971de7fb | 1214 | mark_interval (register INTERVAL i, Lisp_Object dummy) |
d5e35230 | 1215 | { |
cce7fefc DA |
1216 | /* Intervals should never be shared. So, if extra internal checking is |
1217 | enabled, GC aborts if it seems to have visited an interval twice. */ | |
1218 | eassert (!i->gcmarkbit); | |
2336fe58 | 1219 | i->gcmarkbit = 1; |
49723c04 | 1220 | mark_object (i->plist); |
d5e35230 JA |
1221 | } |
1222 | ||
34400008 GM |
1223 | /* Mark the interval tree rooted in I. */ |
1224 | ||
8707c1e5 DA |
1225 | #define MARK_INTERVAL_TREE(i) \ |
1226 | do { \ | |
1227 | if (i && !i->gcmarkbit) \ | |
1228 | traverse_intervals_noorder (i, mark_interval, Qnil); \ | |
2e471eb5 | 1229 | } while (0) |
77c7bcb1 | 1230 | |
2e471eb5 GM |
1231 | /*********************************************************************** |
1232 | String Allocation | |
1233 | ***********************************************************************/ | |
1a4f1e2c | 1234 | |
2e471eb5 GM |
1235 | /* Lisp_Strings are allocated in string_block structures. When a new |
1236 | string_block is allocated, all the Lisp_Strings it contains are | |
e0fead5d | 1237 | added to a free-list string_free_list. When a new Lisp_String is |
2e471eb5 GM |
1238 | needed, it is taken from that list. During the sweep phase of GC, |
1239 | string_blocks that are entirely free are freed, except two which | |
1240 | we keep. | |
7146af97 | 1241 | |
2e471eb5 GM |
1242 | String data is allocated from sblock structures. Strings larger |
1243 | than LARGE_STRING_BYTES, get their own sblock, data for smaller | |
1244 | strings is sub-allocated out of sblocks of size SBLOCK_SIZE. | |
7146af97 | 1245 | |
2e471eb5 GM |
1246 | Sblocks consist internally of sdata structures, one for each |
1247 | Lisp_String. The sdata structure points to the Lisp_String it | |
1248 | belongs to. The Lisp_String points back to the `u.data' member of | |
1249 | its sdata structure. | |
7146af97 | 1250 | |
2e471eb5 GM |
1251 | When a Lisp_String is freed during GC, it is put back on |
1252 | string_free_list, and its `data' member and its sdata's `string' | |
1253 | pointer is set to null. The size of the string is recorded in the | |
fbe9e0b9 | 1254 | `n.nbytes' member of the sdata. So, sdata structures that are no |
2e471eb5 GM |
1255 | longer used, can be easily recognized, and it's easy to compact the |
1256 | sblocks of small strings which we do in compact_small_strings. */ | |
7146af97 | 1257 | |
2e471eb5 GM |
1258 | /* Size in bytes of an sblock structure used for small strings. This |
1259 | is 8192 minus malloc overhead. */ | |
7146af97 | 1260 | |
2e471eb5 | 1261 | #define SBLOCK_SIZE 8188 |
c8099634 | 1262 | |
2e471eb5 GM |
1263 | /* Strings larger than this are considered large strings. String data |
1264 | for large strings is allocated from individual sblocks. */ | |
7146af97 | 1265 | |
2e471eb5 GM |
1266 | #define LARGE_STRING_BYTES 1024 |
1267 | ||
fbe9e0b9 | 1268 | /* Struct or union describing string memory sub-allocated from an sblock. |
2e471eb5 GM |
1269 | This is where the contents of Lisp strings are stored. */ |
1270 | ||
fbe9e0b9 PE |
1271 | #ifdef GC_CHECK_STRING_BYTES |
1272 | ||
1273 | typedef struct | |
7146af97 | 1274 | { |
2e471eb5 GM |
1275 | /* Back-pointer to the string this sdata belongs to. If null, this |
1276 | structure is free, and the NBYTES member of the union below | |
34400008 | 1277 | contains the string's byte size (the same value that STRING_BYTES |
2e471eb5 GM |
1278 | would return if STRING were non-null). If non-null, STRING_BYTES |
1279 | (STRING) is the size of the data, and DATA contains the string's | |
1280 | contents. */ | |
1281 | struct Lisp_String *string; | |
7146af97 | 1282 | |
d311d28c | 1283 | ptrdiff_t nbytes; |
fbe9e0b9 PE |
1284 | unsigned char data[FLEXIBLE_ARRAY_MEMBER]; |
1285 | } sdata; | |
177c0ea7 | 1286 | |
31d929e5 GM |
1287 | #define SDATA_NBYTES(S) (S)->nbytes |
1288 | #define SDATA_DATA(S) (S)->data | |
36372bf9 | 1289 | #define SDATA_SELECTOR(member) member |
177c0ea7 | 1290 | |
fbe9e0b9 | 1291 | #else |
31d929e5 | 1292 | |
fbe9e0b9 PE |
1293 | typedef union |
1294 | { | |
1295 | struct Lisp_String *string; | |
1296 | ||
1297 | /* When STRING is non-null. */ | |
1298 | struct | |
2e471eb5 | 1299 | { |
fbe9e0b9 PE |
1300 | struct Lisp_String *string; |
1301 | unsigned char data[FLEXIBLE_ARRAY_MEMBER]; | |
1302 | } u; | |
2e471eb5 | 1303 | |
fbe9e0b9 PE |
1304 | /* When STRING is null. */ |
1305 | struct | |
1306 | { | |
1307 | struct Lisp_String *string; | |
d311d28c | 1308 | ptrdiff_t nbytes; |
fbe9e0b9 PE |
1309 | } n; |
1310 | } sdata; | |
177c0ea7 | 1311 | |
fbe9e0b9 | 1312 | #define SDATA_NBYTES(S) (S)->n.nbytes |
31d929e5 | 1313 | #define SDATA_DATA(S) (S)->u.data |
36372bf9 | 1314 | #define SDATA_SELECTOR(member) u.member |
31d929e5 GM |
1315 | |
1316 | #endif /* not GC_CHECK_STRING_BYTES */ | |
36372bf9 | 1317 | |
fbe9e0b9 | 1318 | #define SDATA_DATA_OFFSET offsetof (sdata, SDATA_SELECTOR (data)) |
2e471eb5 | 1319 | |
31d929e5 | 1320 | |
2e471eb5 GM |
1321 | /* Structure describing a block of memory which is sub-allocated to |
1322 | obtain string data memory for strings. Blocks for small strings | |
1323 | are of fixed size SBLOCK_SIZE. Blocks for large strings are made | |
1324 | as large as needed. */ | |
1325 | ||
1326 | struct sblock | |
7146af97 | 1327 | { |
2e471eb5 GM |
1328 | /* Next in list. */ |
1329 | struct sblock *next; | |
7146af97 | 1330 | |
2e471eb5 GM |
1331 | /* Pointer to the next free sdata block. This points past the end |
1332 | of the sblock if there isn't any space left in this block. */ | |
fbe9e0b9 | 1333 | sdata *next_free; |
2e471eb5 GM |
1334 | |
1335 | /* Start of data. */ | |
fbe9e0b9 | 1336 | sdata first_data; |
2e471eb5 GM |
1337 | }; |
1338 | ||
1339 | /* Number of Lisp strings in a string_block structure. The 1020 is | |
1340 | 1024 minus malloc overhead. */ | |
1341 | ||
19bcad1f | 1342 | #define STRING_BLOCK_SIZE \ |
2e471eb5 GM |
1343 | ((1020 - sizeof (struct string_block *)) / sizeof (struct Lisp_String)) |
1344 | ||
1345 | /* Structure describing a block from which Lisp_String structures | |
1346 | are allocated. */ | |
1347 | ||
1348 | struct string_block | |
7146af97 | 1349 | { |
6b61353c | 1350 | /* Place `strings' first, to preserve alignment. */ |
19bcad1f | 1351 | struct Lisp_String strings[STRING_BLOCK_SIZE]; |
6b61353c | 1352 | struct string_block *next; |
2e471eb5 | 1353 | }; |
7146af97 | 1354 | |
2e471eb5 GM |
1355 | /* Head and tail of the list of sblock structures holding Lisp string |
1356 | data. We always allocate from current_sblock. The NEXT pointers | |
1357 | in the sblock structures go from oldest_sblock to current_sblock. */ | |
3c06d205 | 1358 | |
2e471eb5 | 1359 | static struct sblock *oldest_sblock, *current_sblock; |
7146af97 | 1360 | |
2e471eb5 | 1361 | /* List of sblocks for large strings. */ |
7146af97 | 1362 | |
2e471eb5 | 1363 | static struct sblock *large_sblocks; |
7146af97 | 1364 | |
5a25e253 | 1365 | /* List of string_block structures. */ |
7146af97 | 1366 | |
2e471eb5 | 1367 | static struct string_block *string_blocks; |
7146af97 | 1368 | |
2e471eb5 | 1369 | /* Free-list of Lisp_Strings. */ |
7146af97 | 1370 | |
2e471eb5 | 1371 | static struct Lisp_String *string_free_list; |
7146af97 | 1372 | |
2e471eb5 | 1373 | /* Number of live and free Lisp_Strings. */ |
c8099634 | 1374 | |
c0c5c8ae | 1375 | static EMACS_INT total_strings, total_free_strings; |
7146af97 | 1376 | |
2e471eb5 GM |
1377 | /* Number of bytes used by live strings. */ |
1378 | ||
3ab6e069 | 1379 | static EMACS_INT total_string_bytes; |
2e471eb5 GM |
1380 | |
1381 | /* Given a pointer to a Lisp_String S which is on the free-list | |
1382 | string_free_list, return a pointer to its successor in the | |
1383 | free-list. */ | |
1384 | ||
1385 | #define NEXT_FREE_LISP_STRING(S) (*(struct Lisp_String **) (S)) | |
1386 | ||
1387 | /* Return a pointer to the sdata structure belonging to Lisp string S. | |
1388 | S must be live, i.e. S->data must not be null. S->data is actually | |
1389 | a pointer to the `u.data' member of its sdata structure; the | |
1390 | structure starts at a constant offset in front of that. */ | |
177c0ea7 | 1391 | |
fbe9e0b9 | 1392 | #define SDATA_OF_STRING(S) ((sdata *) ((S)->data - SDATA_DATA_OFFSET)) |
31d929e5 | 1393 | |
212f33f1 KS |
1394 | |
1395 | #ifdef GC_CHECK_STRING_OVERRUN | |
bdbed949 KS |
1396 | |
1397 | /* We check for overrun in string data blocks by appending a small | |
1398 | "cookie" after each allocated string data block, and check for the | |
8349069c | 1399 | presence of this cookie during GC. */ |
bdbed949 KS |
1400 | |
1401 | #define GC_STRING_OVERRUN_COOKIE_SIZE 4 | |
bfd1c781 PE |
1402 | static char const string_overrun_cookie[GC_STRING_OVERRUN_COOKIE_SIZE] = |
1403 | { '\xde', '\xad', '\xbe', '\xef' }; | |
bdbed949 | 1404 | |
212f33f1 | 1405 | #else |
bdbed949 | 1406 | #define GC_STRING_OVERRUN_COOKIE_SIZE 0 |
212f33f1 KS |
1407 | #endif |
1408 | ||
2e471eb5 GM |
1409 | /* Value is the size of an sdata structure large enough to hold NBYTES |
1410 | bytes of string data. The value returned includes a terminating | |
1411 | NUL byte, the size of the sdata structure, and padding. */ | |
1412 | ||
31d929e5 GM |
1413 | #ifdef GC_CHECK_STRING_BYTES |
1414 | ||
2e471eb5 | 1415 | #define SDATA_SIZE(NBYTES) \ |
36372bf9 | 1416 | ((SDATA_DATA_OFFSET \ |
2e471eb5 | 1417 | + (NBYTES) + 1 \ |
d311d28c PE |
1418 | + sizeof (ptrdiff_t) - 1) \ |
1419 | & ~(sizeof (ptrdiff_t) - 1)) | |
2e471eb5 | 1420 | |
31d929e5 GM |
1421 | #else /* not GC_CHECK_STRING_BYTES */ |
1422 | ||
f2d3008d PE |
1423 | /* The 'max' reserves space for the nbytes union member even when NBYTES + 1 is |
1424 | less than the size of that member. The 'max' is not needed when | |
d311d28c | 1425 | SDATA_DATA_OFFSET is a multiple of sizeof (ptrdiff_t), because then the |
f2d3008d PE |
1426 | alignment code reserves enough space. */ |
1427 | ||
1428 | #define SDATA_SIZE(NBYTES) \ | |
1429 | ((SDATA_DATA_OFFSET \ | |
d311d28c | 1430 | + (SDATA_DATA_OFFSET % sizeof (ptrdiff_t) == 0 \ |
f2d3008d | 1431 | ? NBYTES \ |
d311d28c | 1432 | : max (NBYTES, sizeof (ptrdiff_t) - 1)) \ |
f2d3008d | 1433 | + 1 \ |
d311d28c PE |
1434 | + sizeof (ptrdiff_t) - 1) \ |
1435 | & ~(sizeof (ptrdiff_t) - 1)) | |
31d929e5 GM |
1436 | |
1437 | #endif /* not GC_CHECK_STRING_BYTES */ | |
2e471eb5 | 1438 | |
bdbed949 KS |
1439 | /* Extra bytes to allocate for each string. */ |
1440 | ||
1441 | #define GC_STRING_EXTRA (GC_STRING_OVERRUN_COOKIE_SIZE) | |
1442 | ||
c9d624c6 PE |
1443 | /* Exact bound on the number of bytes in a string, not counting the |
1444 | terminating null. A string cannot contain more bytes than | |
1445 | STRING_BYTES_BOUND, nor can it be so long that the size_t | |
1446 | arithmetic in allocate_string_data would overflow while it is | |
1447 | calculating a value to be passed to malloc. */ | |
03a660a6 PE |
1448 | static ptrdiff_t const STRING_BYTES_MAX = |
1449 | min (STRING_BYTES_BOUND, | |
1450 | ((SIZE_MAX - XMALLOC_OVERRUN_CHECK_OVERHEAD | |
1451 | - GC_STRING_EXTRA | |
1452 | - offsetof (struct sblock, first_data) | |
1453 | - SDATA_DATA_OFFSET) | |
1454 | & ~(sizeof (EMACS_INT) - 1))); | |
c9d624c6 | 1455 | |
2e471eb5 | 1456 | /* Initialize string allocation. Called from init_alloc_once. */ |
d457598b | 1457 | |
d3d47262 | 1458 | static void |
971de7fb | 1459 | init_strings (void) |
7146af97 | 1460 | { |
4d774b0f JB |
1461 | empty_unibyte_string = make_pure_string ("", 0, 0, 0); |
1462 | empty_multibyte_string = make_pure_string ("", 0, 0, 1); | |
7146af97 JB |
1463 | } |
1464 | ||
2e471eb5 | 1465 | |
361b097f GM |
1466 | #ifdef GC_CHECK_STRING_BYTES |
1467 | ||
361b097f GM |
1468 | static int check_string_bytes_count; |
1469 | ||
e499d0ee DA |
1470 | /* Like STRING_BYTES, but with debugging check. Can be |
1471 | called during GC, so pay attention to the mark bit. */ | |
676a7251 | 1472 | |
d311d28c | 1473 | ptrdiff_t |
14162469 | 1474 | string_bytes (struct Lisp_String *s) |
676a7251 | 1475 | { |
d311d28c | 1476 | ptrdiff_t nbytes = |
14162469 EZ |
1477 | (s->size_byte < 0 ? s->size & ~ARRAY_MARK_FLAG : s->size_byte); |
1478 | ||
676a7251 GM |
1479 | if (!PURE_POINTER_P (s) |
1480 | && s->data | |
1481 | && nbytes != SDATA_NBYTES (SDATA_OF_STRING (s))) | |
1088b922 | 1482 | emacs_abort (); |
676a7251 GM |
1483 | return nbytes; |
1484 | } | |
177c0ea7 | 1485 | |
2c5bd608 | 1486 | /* Check validity of Lisp strings' string_bytes member in B. */ |
676a7251 | 1487 | |
d3d47262 | 1488 | static void |
d0f4e1f5 | 1489 | check_sblock (struct sblock *b) |
361b097f | 1490 | { |
fbe9e0b9 | 1491 | sdata *from, *end, *from_end; |
177c0ea7 | 1492 | |
676a7251 | 1493 | end = b->next_free; |
177c0ea7 | 1494 | |
676a7251 | 1495 | for (from = &b->first_data; from < end; from = from_end) |
361b097f | 1496 | { |
676a7251 GM |
1497 | /* Compute the next FROM here because copying below may |
1498 | overwrite data we need to compute it. */ | |
d311d28c | 1499 | ptrdiff_t nbytes; |
177c0ea7 | 1500 | |
676a7251 | 1501 | /* Check that the string size recorded in the string is the |
ee28be33 | 1502 | same as the one recorded in the sdata structure. */ |
e499d0ee DA |
1503 | nbytes = SDATA_SIZE (from->string ? string_bytes (from->string) |
1504 | : SDATA_NBYTES (from)); | |
fbe9e0b9 | 1505 | from_end = (sdata *) ((char *) from + nbytes + GC_STRING_EXTRA); |
676a7251 GM |
1506 | } |
1507 | } | |
361b097f | 1508 | |
676a7251 GM |
1509 | |
1510 | /* Check validity of Lisp strings' string_bytes member. ALL_P | |
fce31d69 | 1511 | means check all strings, otherwise check only most |
676a7251 GM |
1512 | recently allocated strings. Used for hunting a bug. */ |
1513 | ||
d3d47262 | 1514 | static void |
fce31d69 | 1515 | check_string_bytes (bool all_p) |
676a7251 GM |
1516 | { |
1517 | if (all_p) | |
1518 | { | |
1519 | struct sblock *b; | |
1520 | ||
1521 | for (b = large_sblocks; b; b = b->next) | |
1522 | { | |
1523 | struct Lisp_String *s = b->first_data.string; | |
1524 | if (s) | |
e499d0ee | 1525 | string_bytes (s); |
361b097f | 1526 | } |
177c0ea7 | 1527 | |
676a7251 GM |
1528 | for (b = oldest_sblock; b; b = b->next) |
1529 | check_sblock (b); | |
361b097f | 1530 | } |
296094c3 | 1531 | else if (current_sblock) |
676a7251 | 1532 | check_sblock (current_sblock); |
361b097f GM |
1533 | } |
1534 | ||
e499d0ee DA |
1535 | #else /* not GC_CHECK_STRING_BYTES */ |
1536 | ||
1537 | #define check_string_bytes(all) ((void) 0) | |
1538 | ||
361b097f GM |
1539 | #endif /* GC_CHECK_STRING_BYTES */ |
1540 | ||
212f33f1 KS |
1541 | #ifdef GC_CHECK_STRING_FREE_LIST |
1542 | ||
bdbed949 KS |
1543 | /* Walk through the string free list looking for bogus next pointers. |
1544 | This may catch buffer overrun from a previous string. */ | |
1545 | ||
212f33f1 | 1546 | static void |
d0f4e1f5 | 1547 | check_string_free_list (void) |
212f33f1 KS |
1548 | { |
1549 | struct Lisp_String *s; | |
1550 | ||
1551 | /* Pop a Lisp_String off the free-list. */ | |
1552 | s = string_free_list; | |
1553 | while (s != NULL) | |
1554 | { | |
d01a7826 | 1555 | if ((uintptr_t) s < 1024) |
1088b922 | 1556 | emacs_abort (); |
212f33f1 KS |
1557 | s = NEXT_FREE_LISP_STRING (s); |
1558 | } | |
1559 | } | |
1560 | #else | |
1561 | #define check_string_free_list() | |
1562 | #endif | |
361b097f | 1563 | |
2e471eb5 GM |
1564 | /* Return a new Lisp_String. */ |
1565 | ||
1566 | static struct Lisp_String * | |
971de7fb | 1567 | allocate_string (void) |
7146af97 | 1568 | { |
2e471eb5 | 1569 | struct Lisp_String *s; |
7146af97 | 1570 | |
dafc79fa | 1571 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 1572 | |
2e471eb5 GM |
1573 | /* If the free-list is empty, allocate a new string_block, and |
1574 | add all the Lisp_Strings in it to the free-list. */ | |
1575 | if (string_free_list == NULL) | |
7146af97 | 1576 | { |
38182d90 | 1577 | struct string_block *b = lisp_malloc (sizeof *b, MEM_TYPE_STRING); |
2e471eb5 GM |
1578 | int i; |
1579 | ||
2e471eb5 GM |
1580 | b->next = string_blocks; |
1581 | string_blocks = b; | |
2e471eb5 | 1582 | |
19bcad1f | 1583 | for (i = STRING_BLOCK_SIZE - 1; i >= 0; --i) |
7146af97 | 1584 | { |
2e471eb5 | 1585 | s = b->strings + i; |
3fe6dd74 DA |
1586 | /* Every string on a free list should have NULL data pointer. */ |
1587 | s->data = NULL; | |
2e471eb5 GM |
1588 | NEXT_FREE_LISP_STRING (s) = string_free_list; |
1589 | string_free_list = s; | |
7146af97 | 1590 | } |
2e471eb5 | 1591 | |
19bcad1f | 1592 | total_free_strings += STRING_BLOCK_SIZE; |
7146af97 | 1593 | } |
c0f51373 | 1594 | |
bdbed949 | 1595 | check_string_free_list (); |
212f33f1 | 1596 | |
2e471eb5 GM |
1597 | /* Pop a Lisp_String off the free-list. */ |
1598 | s = string_free_list; | |
1599 | string_free_list = NEXT_FREE_LISP_STRING (s); | |
c0f51373 | 1600 | |
dafc79fa | 1601 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 1602 | |
2e471eb5 GM |
1603 | --total_free_strings; |
1604 | ++total_strings; | |
1605 | ++strings_consed; | |
1606 | consing_since_gc += sizeof *s; | |
c0f51373 | 1607 | |
361b097f | 1608 | #ifdef GC_CHECK_STRING_BYTES |
e39a993c | 1609 | if (!noninteractive) |
361b097f | 1610 | { |
676a7251 GM |
1611 | if (++check_string_bytes_count == 200) |
1612 | { | |
1613 | check_string_bytes_count = 0; | |
1614 | check_string_bytes (1); | |
1615 | } | |
1616 | else | |
1617 | check_string_bytes (0); | |
361b097f | 1618 | } |
676a7251 | 1619 | #endif /* GC_CHECK_STRING_BYTES */ |
361b097f | 1620 | |
2e471eb5 | 1621 | return s; |
c0f51373 | 1622 | } |
7146af97 | 1623 | |
7146af97 | 1624 | |
2e471eb5 GM |
1625 | /* Set up Lisp_String S for holding NCHARS characters, NBYTES bytes, |
1626 | plus a NUL byte at the end. Allocate an sdata structure for S, and | |
1627 | set S->data to its `u.data' member. Store a NUL byte at the end of | |
1628 | S->data. Set S->size to NCHARS and S->size_byte to NBYTES. Free | |
1629 | S->data if it was initially non-null. */ | |
7146af97 | 1630 | |
2e471eb5 | 1631 | void |
413d18e7 EZ |
1632 | allocate_string_data (struct Lisp_String *s, |
1633 | EMACS_INT nchars, EMACS_INT nbytes) | |
7146af97 | 1634 | { |
fbe9e0b9 | 1635 | sdata *data, *old_data; |
2e471eb5 | 1636 | struct sblock *b; |
b7ffe040 | 1637 | ptrdiff_t needed, old_nbytes; |
7146af97 | 1638 | |
c9d624c6 PE |
1639 | if (STRING_BYTES_MAX < nbytes) |
1640 | string_overflow (); | |
1641 | ||
2e471eb5 GM |
1642 | /* Determine the number of bytes needed to store NBYTES bytes |
1643 | of string data. */ | |
1644 | needed = SDATA_SIZE (nbytes); | |
b7ffe040 DA |
1645 | if (s->data) |
1646 | { | |
1647 | old_data = SDATA_OF_STRING (s); | |
e499d0ee | 1648 | old_nbytes = STRING_BYTES (s); |
b7ffe040 DA |
1649 | } |
1650 | else | |
1651 | old_data = NULL; | |
e2984df0 | 1652 | |
dafc79fa | 1653 | MALLOC_BLOCK_INPUT; |
7146af97 | 1654 | |
2e471eb5 GM |
1655 | if (nbytes > LARGE_STRING_BYTES) |
1656 | { | |
36372bf9 | 1657 | size_t size = offsetof (struct sblock, first_data) + needed; |
2e471eb5 GM |
1658 | |
1659 | #ifdef DOUG_LEA_MALLOC | |
f8608968 GM |
1660 | /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed |
1661 | because mapped region contents are not preserved in | |
d36b182f DL |
1662 | a dumped Emacs. |
1663 | ||
1664 | In case you think of allowing it in a dumped Emacs at the | |
1665 | cost of not being able to re-dump, there's another reason: | |
1666 | mmap'ed data typically have an address towards the top of the | |
1667 | address space, which won't fit into an EMACS_INT (at least on | |
1668 | 32-bit systems with the current tagging scheme). --fx */ | |
2e471eb5 GM |
1669 | mallopt (M_MMAP_MAX, 0); |
1670 | #endif | |
1671 | ||
38182d90 | 1672 | b = lisp_malloc (size + GC_STRING_EXTRA, MEM_TYPE_NON_LISP); |
177c0ea7 | 1673 | |
2e471eb5 | 1674 | #ifdef DOUG_LEA_MALLOC |
b09cca6a | 1675 | /* Back to a reasonable maximum of mmap'ed areas. */ |
2e471eb5 GM |
1676 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); |
1677 | #endif | |
177c0ea7 | 1678 | |
2e471eb5 GM |
1679 | b->next_free = &b->first_data; |
1680 | b->first_data.string = NULL; | |
1681 | b->next = large_sblocks; | |
1682 | large_sblocks = b; | |
1683 | } | |
1684 | else if (current_sblock == NULL | |
1685 | || (((char *) current_sblock + SBLOCK_SIZE | |
1686 | - (char *) current_sblock->next_free) | |
212f33f1 | 1687 | < (needed + GC_STRING_EXTRA))) |
2e471eb5 GM |
1688 | { |
1689 | /* Not enough room in the current sblock. */ | |
38182d90 | 1690 | b = lisp_malloc (SBLOCK_SIZE, MEM_TYPE_NON_LISP); |
2e471eb5 GM |
1691 | b->next_free = &b->first_data; |
1692 | b->first_data.string = NULL; | |
1693 | b->next = NULL; | |
1694 | ||
1695 | if (current_sblock) | |
1696 | current_sblock->next = b; | |
1697 | else | |
1698 | oldest_sblock = b; | |
1699 | current_sblock = b; | |
1700 | } | |
1701 | else | |
1702 | b = current_sblock; | |
5c5fecb3 | 1703 | |
2e471eb5 | 1704 | data = b->next_free; |
fbe9e0b9 | 1705 | b->next_free = (sdata *) ((char *) data + needed + GC_STRING_EXTRA); |
a0b08700 | 1706 | |
dafc79fa | 1707 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 1708 | |
2e471eb5 | 1709 | data->string = s; |
31d929e5 GM |
1710 | s->data = SDATA_DATA (data); |
1711 | #ifdef GC_CHECK_STRING_BYTES | |
1712 | SDATA_NBYTES (data) = nbytes; | |
1713 | #endif | |
2e471eb5 GM |
1714 | s->size = nchars; |
1715 | s->size_byte = nbytes; | |
1716 | s->data[nbytes] = '\0'; | |
212f33f1 | 1717 | #ifdef GC_CHECK_STRING_OVERRUN |
000098c1 PE |
1718 | memcpy ((char *) data + needed, string_overrun_cookie, |
1719 | GC_STRING_OVERRUN_COOKIE_SIZE); | |
212f33f1 | 1720 | #endif |
b7ffe040 DA |
1721 | |
1722 | /* Note that Faset may call to this function when S has already data | |
1723 | assigned. In this case, mark data as free by setting it's string | |
1724 | back-pointer to null, and record the size of the data in it. */ | |
1725 | if (old_data) | |
1726 | { | |
1727 | SDATA_NBYTES (old_data) = old_nbytes; | |
1728 | old_data->string = NULL; | |
1729 | } | |
1730 | ||
2e471eb5 GM |
1731 | consing_since_gc += needed; |
1732 | } | |
1733 | ||
1734 | ||
1735 | /* Sweep and compact strings. */ | |
1736 | ||
1737 | static void | |
971de7fb | 1738 | sweep_strings (void) |
2e471eb5 GM |
1739 | { |
1740 | struct string_block *b, *next; | |
1741 | struct string_block *live_blocks = NULL; | |
177c0ea7 | 1742 | |
2e471eb5 GM |
1743 | string_free_list = NULL; |
1744 | total_strings = total_free_strings = 0; | |
3ab6e069 | 1745 | total_string_bytes = 0; |
2e471eb5 GM |
1746 | |
1747 | /* Scan strings_blocks, free Lisp_Strings that aren't marked. */ | |
1748 | for (b = string_blocks; b; b = next) | |
1749 | { | |
1750 | int i, nfree = 0; | |
1751 | struct Lisp_String *free_list_before = string_free_list; | |
1752 | ||
1753 | next = b->next; | |
1754 | ||
19bcad1f | 1755 | for (i = 0; i < STRING_BLOCK_SIZE; ++i) |
2e471eb5 GM |
1756 | { |
1757 | struct Lisp_String *s = b->strings + i; | |
1758 | ||
1759 | if (s->data) | |
1760 | { | |
1761 | /* String was not on free-list before. */ | |
1762 | if (STRING_MARKED_P (s)) | |
1763 | { | |
1764 | /* String is live; unmark it and its intervals. */ | |
1765 | UNMARK_STRING (s); | |
177c0ea7 | 1766 | |
8707c1e5 DA |
1767 | /* Do not use string_(set|get)_intervals here. */ |
1768 | s->intervals = balance_intervals (s->intervals); | |
2e471eb5 GM |
1769 | |
1770 | ++total_strings; | |
3ab6e069 | 1771 | total_string_bytes += STRING_BYTES (s); |
2e471eb5 GM |
1772 | } |
1773 | else | |
1774 | { | |
1775 | /* String is dead. Put it on the free-list. */ | |
fbe9e0b9 | 1776 | sdata *data = SDATA_OF_STRING (s); |
2e471eb5 GM |
1777 | |
1778 | /* Save the size of S in its sdata so that we know | |
1779 | how large that is. Reset the sdata's string | |
1780 | back-pointer so that we know it's free. */ | |
31d929e5 | 1781 | #ifdef GC_CHECK_STRING_BYTES |
e499d0ee | 1782 | if (string_bytes (s) != SDATA_NBYTES (data)) |
1088b922 | 1783 | emacs_abort (); |
31d929e5 | 1784 | #else |
fbe9e0b9 | 1785 | data->n.nbytes = STRING_BYTES (s); |
31d929e5 | 1786 | #endif |
2e471eb5 GM |
1787 | data->string = NULL; |
1788 | ||
1789 | /* Reset the strings's `data' member so that we | |
1790 | know it's free. */ | |
1791 | s->data = NULL; | |
1792 | ||
1793 | /* Put the string on the free-list. */ | |
1794 | NEXT_FREE_LISP_STRING (s) = string_free_list; | |
1795 | string_free_list = s; | |
1796 | ++nfree; | |
1797 | } | |
1798 | } | |
1799 | else | |
1800 | { | |
1801 | /* S was on the free-list before. Put it there again. */ | |
1802 | NEXT_FREE_LISP_STRING (s) = string_free_list; | |
1803 | string_free_list = s; | |
1804 | ++nfree; | |
1805 | } | |
1806 | } | |
1807 | ||
34400008 | 1808 | /* Free blocks that contain free Lisp_Strings only, except |
2e471eb5 | 1809 | the first two of them. */ |
19bcad1f SM |
1810 | if (nfree == STRING_BLOCK_SIZE |
1811 | && total_free_strings > STRING_BLOCK_SIZE) | |
2e471eb5 GM |
1812 | { |
1813 | lisp_free (b); | |
2e471eb5 GM |
1814 | string_free_list = free_list_before; |
1815 | } | |
1816 | else | |
1817 | { | |
1818 | total_free_strings += nfree; | |
1819 | b->next = live_blocks; | |
1820 | live_blocks = b; | |
1821 | } | |
1822 | } | |
1823 | ||
bdbed949 | 1824 | check_string_free_list (); |
212f33f1 | 1825 | |
2e471eb5 GM |
1826 | string_blocks = live_blocks; |
1827 | free_large_strings (); | |
1828 | compact_small_strings (); | |
212f33f1 | 1829 | |
bdbed949 | 1830 | check_string_free_list (); |
2e471eb5 GM |
1831 | } |
1832 | ||
1833 | ||
1834 | /* Free dead large strings. */ | |
1835 | ||
1836 | static void | |
971de7fb | 1837 | free_large_strings (void) |
2e471eb5 GM |
1838 | { |
1839 | struct sblock *b, *next; | |
1840 | struct sblock *live_blocks = NULL; | |
177c0ea7 | 1841 | |
2e471eb5 GM |
1842 | for (b = large_sblocks; b; b = next) |
1843 | { | |
1844 | next = b->next; | |
1845 | ||
1846 | if (b->first_data.string == NULL) | |
1847 | lisp_free (b); | |
1848 | else | |
1849 | { | |
1850 | b->next = live_blocks; | |
1851 | live_blocks = b; | |
1852 | } | |
1853 | } | |
1854 | ||
1855 | large_sblocks = live_blocks; | |
1856 | } | |
1857 | ||
1858 | ||
1859 | /* Compact data of small strings. Free sblocks that don't contain | |
1860 | data of live strings after compaction. */ | |
1861 | ||
1862 | static void | |
971de7fb | 1863 | compact_small_strings (void) |
2e471eb5 GM |
1864 | { |
1865 | struct sblock *b, *tb, *next; | |
fbe9e0b9 PE |
1866 | sdata *from, *to, *end, *tb_end; |
1867 | sdata *to_end, *from_end; | |
2e471eb5 GM |
1868 | |
1869 | /* TB is the sblock we copy to, TO is the sdata within TB we copy | |
1870 | to, and TB_END is the end of TB. */ | |
1871 | tb = oldest_sblock; | |
fbe9e0b9 | 1872 | tb_end = (sdata *) ((char *) tb + SBLOCK_SIZE); |
2e471eb5 GM |
1873 | to = &tb->first_data; |
1874 | ||
1875 | /* Step through the blocks from the oldest to the youngest. We | |
1876 | expect that old blocks will stabilize over time, so that less | |
1877 | copying will happen this way. */ | |
1878 | for (b = oldest_sblock; b; b = b->next) | |
1879 | { | |
1880 | end = b->next_free; | |
a54e2c05 | 1881 | eassert ((char *) end <= (char *) b + SBLOCK_SIZE); |
177c0ea7 | 1882 | |
2e471eb5 GM |
1883 | for (from = &b->first_data; from < end; from = from_end) |
1884 | { | |
1885 | /* Compute the next FROM here because copying below may | |
1886 | overwrite data we need to compute it. */ | |
d311d28c | 1887 | ptrdiff_t nbytes; |
e499d0ee | 1888 | struct Lisp_String *s = from->string; |
2e471eb5 | 1889 | |
31d929e5 GM |
1890 | #ifdef GC_CHECK_STRING_BYTES |
1891 | /* Check that the string size recorded in the string is the | |
b09cca6a | 1892 | same as the one recorded in the sdata structure. */ |
e499d0ee | 1893 | if (s && string_bytes (s) != SDATA_NBYTES (from)) |
1088b922 | 1894 | emacs_abort (); |
31d929e5 | 1895 | #endif /* GC_CHECK_STRING_BYTES */ |
177c0ea7 | 1896 | |
e499d0ee DA |
1897 | nbytes = s ? STRING_BYTES (s) : SDATA_NBYTES (from); |
1898 | eassert (nbytes <= LARGE_STRING_BYTES); | |
212f33f1 | 1899 | |
2e471eb5 | 1900 | nbytes = SDATA_SIZE (nbytes); |
fbe9e0b9 | 1901 | from_end = (sdata *) ((char *) from + nbytes + GC_STRING_EXTRA); |
212f33f1 KS |
1902 | |
1903 | #ifdef GC_CHECK_STRING_OVERRUN | |
72af86bd AS |
1904 | if (memcmp (string_overrun_cookie, |
1905 | (char *) from_end - GC_STRING_OVERRUN_COOKIE_SIZE, | |
1906 | GC_STRING_OVERRUN_COOKIE_SIZE)) | |
1088b922 | 1907 | emacs_abort (); |
212f33f1 | 1908 | #endif |
177c0ea7 | 1909 | |
e499d0ee DA |
1910 | /* Non-NULL S means it's alive. Copy its data. */ |
1911 | if (s) | |
2e471eb5 GM |
1912 | { |
1913 | /* If TB is full, proceed with the next sblock. */ | |
fbe9e0b9 | 1914 | to_end = (sdata *) ((char *) to + nbytes + GC_STRING_EXTRA); |
2e471eb5 GM |
1915 | if (to_end > tb_end) |
1916 | { | |
1917 | tb->next_free = to; | |
1918 | tb = tb->next; | |
fbe9e0b9 | 1919 | tb_end = (sdata *) ((char *) tb + SBLOCK_SIZE); |
2e471eb5 | 1920 | to = &tb->first_data; |
fbe9e0b9 | 1921 | to_end = (sdata *) ((char *) to + nbytes + GC_STRING_EXTRA); |
2e471eb5 | 1922 | } |
177c0ea7 | 1923 | |
2e471eb5 GM |
1924 | /* Copy, and update the string's `data' pointer. */ |
1925 | if (from != to) | |
1926 | { | |
a54e2c05 | 1927 | eassert (tb != b || to < from); |
72af86bd | 1928 | memmove (to, from, nbytes + GC_STRING_EXTRA); |
31d929e5 | 1929 | to->string->data = SDATA_DATA (to); |
2e471eb5 GM |
1930 | } |
1931 | ||
1932 | /* Advance past the sdata we copied to. */ | |
1933 | to = to_end; | |
1934 | } | |
1935 | } | |
1936 | } | |
1937 | ||
1938 | /* The rest of the sblocks following TB don't contain live data, so | |
1939 | we can free them. */ | |
1940 | for (b = tb->next; b; b = next) | |
1941 | { | |
1942 | next = b->next; | |
1943 | lisp_free (b); | |
1944 | } | |
1945 | ||
1946 | tb->next_free = to; | |
1947 | tb->next = NULL; | |
1948 | current_sblock = tb; | |
1949 | } | |
1950 | ||
cb93f9be PE |
1951 | void |
1952 | string_overflow (void) | |
1953 | { | |
1954 | error ("Maximum string size exceeded"); | |
1955 | } | |
2e471eb5 | 1956 | |
a7ca3326 | 1957 | DEFUN ("make-string", Fmake_string, Smake_string, 2, 2, 0, |
69623621 RS |
1958 | doc: /* Return a newly created string of length LENGTH, with INIT in each element. |
1959 | LENGTH must be an integer. | |
1960 | INIT must be an integer that represents a character. */) | |
5842a27b | 1961 | (Lisp_Object length, Lisp_Object init) |
2e471eb5 GM |
1962 | { |
1963 | register Lisp_Object val; | |
1964 | register unsigned char *p, *end; | |
14162469 EZ |
1965 | int c; |
1966 | EMACS_INT nbytes; | |
2e471eb5 | 1967 | |
b7826503 | 1968 | CHECK_NATNUM (length); |
2bccce07 | 1969 | CHECK_CHARACTER (init); |
2e471eb5 | 1970 | |
2bccce07 | 1971 | c = XFASTINT (init); |
830ff83b | 1972 | if (ASCII_CHAR_P (c)) |
2e471eb5 GM |
1973 | { |
1974 | nbytes = XINT (length); | |
1975 | val = make_uninit_string (nbytes); | |
d5db4077 KR |
1976 | p = SDATA (val); |
1977 | end = p + SCHARS (val); | |
2e471eb5 GM |
1978 | while (p != end) |
1979 | *p++ = c; | |
1980 | } | |
1981 | else | |
1982 | { | |
d942b71c | 1983 | unsigned char str[MAX_MULTIBYTE_LENGTH]; |
2e471eb5 | 1984 | int len = CHAR_STRING (c, str); |
14162469 | 1985 | EMACS_INT string_len = XINT (length); |
2e471eb5 | 1986 | |
d1f3d2af | 1987 | if (string_len > STRING_BYTES_MAX / len) |
cb93f9be | 1988 | string_overflow (); |
14162469 EZ |
1989 | nbytes = len * string_len; |
1990 | val = make_uninit_multibyte_string (string_len, nbytes); | |
d5db4077 | 1991 | p = SDATA (val); |
2e471eb5 GM |
1992 | end = p + nbytes; |
1993 | while (p != end) | |
1994 | { | |
72af86bd | 1995 | memcpy (p, str, len); |
2e471eb5 GM |
1996 | p += len; |
1997 | } | |
1998 | } | |
177c0ea7 | 1999 | |
2e471eb5 GM |
2000 | *p = 0; |
2001 | return val; | |
2002 | } | |
2003 | ||
3e0b94e7 DC |
2004 | verify (sizeof (size_t) * CHAR_BIT == BITS_PER_SIZE_T); |
2005 | verify ((BITS_PER_SIZE_T & (BITS_PER_SIZE_T - 1)) == 0); | |
2006 | ||
2007 | static | |
2008 | ptrdiff_t | |
2009 | bool_vector_payload_bytes (ptrdiff_t nr_bits, | |
2010 | ptrdiff_t* exact_needed_bytes_out) | |
2011 | { | |
2012 | ptrdiff_t exact_needed_bytes; | |
2013 | ptrdiff_t needed_bytes; | |
2014 | ||
2015 | eassert_and_assume (nr_bits >= 0); | |
2016 | ||
2017 | exact_needed_bytes = ROUNDUP ((size_t) nr_bits, CHAR_BIT) / CHAR_BIT; | |
2018 | needed_bytes = ROUNDUP ((size_t) nr_bits, BITS_PER_SIZE_T) / CHAR_BIT; | |
2019 | ||
2020 | if (needed_bytes == 0) | |
2021 | { | |
2022 | /* Always allocate at least one machine word of payload so that | |
2023 | bool-vector operations in data.c don't need a special case | |
2024 | for empty vectors. */ | |
2025 | needed_bytes = sizeof (size_t); | |
2026 | } | |
2027 | ||
2028 | if (exact_needed_bytes_out != NULL) | |
2029 | *exact_needed_bytes_out = exact_needed_bytes; | |
2030 | ||
2031 | return needed_bytes; | |
2032 | } | |
2e471eb5 | 2033 | |
a7ca3326 | 2034 | DEFUN ("make-bool-vector", Fmake_bool_vector, Smake_bool_vector, 2, 2, 0, |
909e3b33 | 2035 | doc: /* Return a new bool-vector of length LENGTH, using INIT for each element. |
7ee72033 | 2036 | LENGTH must be a number. INIT matters only in whether it is t or nil. */) |
5842a27b | 2037 | (Lisp_Object length, Lisp_Object init) |
2e471eb5 GM |
2038 | { |
2039 | register Lisp_Object val; | |
2040 | struct Lisp_Bool_Vector *p; | |
3e0b94e7 DC |
2041 | ptrdiff_t exact_payload_bytes; |
2042 | ptrdiff_t total_payload_bytes; | |
2043 | ptrdiff_t needed_elements; | |
2e471eb5 | 2044 | |
b7826503 | 2045 | CHECK_NATNUM (length); |
3e0b94e7 DC |
2046 | if (PTRDIFF_MAX < XFASTINT (length)) |
2047 | memory_full (SIZE_MAX); | |
2e471eb5 | 2048 | |
3e0b94e7 DC |
2049 | total_payload_bytes = bool_vector_payload_bytes |
2050 | (XFASTINT (length), &exact_payload_bytes); | |
2e471eb5 | 2051 | |
3e0b94e7 DC |
2052 | eassert_and_assume (exact_payload_bytes <= total_payload_bytes); |
2053 | eassert_and_assume (0 <= exact_payload_bytes); | |
2e471eb5 | 2054 | |
3e0b94e7 DC |
2055 | needed_elements = ROUNDUP ((size_t) ((bool_header_size - header_size) |
2056 | + total_payload_bytes), | |
2057 | word_size) / word_size; | |
177c0ea7 | 2058 | |
3e0b94e7 DC |
2059 | p = (struct Lisp_Bool_Vector* ) allocate_vector (needed_elements); |
2060 | XSETVECTOR (val, p); | |
914adc42 | 2061 | XSETPVECTYPESIZE (XVECTOR (val), PVEC_BOOL_VECTOR, 0, 0); |
d2029e5b | 2062 | |
2e471eb5 | 2063 | p->size = XFASTINT (length); |
3e0b94e7 | 2064 | if (exact_payload_bytes) |
c0c1ee9f | 2065 | { |
3e0b94e7 | 2066 | memset (p->data, ! NILP (init) ? -1 : 0, exact_payload_bytes); |
177c0ea7 | 2067 | |
c0c1ee9f | 2068 | /* Clear any extraneous bits in the last byte. */ |
3e0b94e7 | 2069 | p->data[exact_payload_bytes - 1] |
83713154 | 2070 | &= (1 << ((XFASTINT (length) - 1) % BOOL_VECTOR_BITS_PER_CHAR + 1)) - 1; |
c0c1ee9f | 2071 | } |
2e471eb5 | 2072 | |
3e0b94e7 DC |
2073 | /* Clear padding at the end. */ |
2074 | memset (p->data + exact_payload_bytes, | |
2075 | 0, | |
2076 | total_payload_bytes - exact_payload_bytes); | |
2077 | ||
2e471eb5 GM |
2078 | return val; |
2079 | } | |
2080 | ||
2081 | ||
2082 | /* Make a string from NBYTES bytes at CONTENTS, and compute the number | |
2083 | of characters from the contents. This string may be unibyte or | |
2084 | multibyte, depending on the contents. */ | |
2085 | ||
2086 | Lisp_Object | |
d311d28c | 2087 | make_string (const char *contents, ptrdiff_t nbytes) |
2e471eb5 GM |
2088 | { |
2089 | register Lisp_Object val; | |
d311d28c | 2090 | ptrdiff_t nchars, multibyte_nbytes; |
9eac9d59 | 2091 | |
90256841 PE |
2092 | parse_str_as_multibyte ((const unsigned char *) contents, nbytes, |
2093 | &nchars, &multibyte_nbytes); | |
9eac9d59 KH |
2094 | if (nbytes == nchars || nbytes != multibyte_nbytes) |
2095 | /* CONTENTS contains no multibyte sequences or contains an invalid | |
2096 | multibyte sequence. We must make unibyte string. */ | |
495a6df3 KH |
2097 | val = make_unibyte_string (contents, nbytes); |
2098 | else | |
2099 | val = make_multibyte_string (contents, nchars, nbytes); | |
2e471eb5 GM |
2100 | return val; |
2101 | } | |
2102 | ||
2103 | ||
2104 | /* Make an unibyte string from LENGTH bytes at CONTENTS. */ | |
2105 | ||
2106 | Lisp_Object | |
d311d28c | 2107 | make_unibyte_string (const char *contents, ptrdiff_t length) |
2e471eb5 GM |
2108 | { |
2109 | register Lisp_Object val; | |
2110 | val = make_uninit_string (length); | |
72af86bd | 2111 | memcpy (SDATA (val), contents, length); |
2e471eb5 GM |
2112 | return val; |
2113 | } | |
2114 | ||
2115 | ||
2116 | /* Make a multibyte string from NCHARS characters occupying NBYTES | |
2117 | bytes at CONTENTS. */ | |
2118 | ||
2119 | Lisp_Object | |
14162469 | 2120 | make_multibyte_string (const char *contents, |
d311d28c | 2121 | ptrdiff_t nchars, ptrdiff_t nbytes) |
2e471eb5 GM |
2122 | { |
2123 | register Lisp_Object val; | |
2124 | val = make_uninit_multibyte_string (nchars, nbytes); | |
72af86bd | 2125 | memcpy (SDATA (val), contents, nbytes); |
2e471eb5 GM |
2126 | return val; |
2127 | } | |
2128 | ||
2129 | ||
2130 | /* Make a string from NCHARS characters occupying NBYTES bytes at | |
2131 | CONTENTS. It is a multibyte string if NBYTES != NCHARS. */ | |
2132 | ||
2133 | Lisp_Object | |
14162469 | 2134 | make_string_from_bytes (const char *contents, |
d311d28c | 2135 | ptrdiff_t nchars, ptrdiff_t nbytes) |
2e471eb5 GM |
2136 | { |
2137 | register Lisp_Object val; | |
2138 | val = make_uninit_multibyte_string (nchars, nbytes); | |
72af86bd | 2139 | memcpy (SDATA (val), contents, nbytes); |
d5db4077 KR |
2140 | if (SBYTES (val) == SCHARS (val)) |
2141 | STRING_SET_UNIBYTE (val); | |
2e471eb5 GM |
2142 | return val; |
2143 | } | |
2144 | ||
2145 | ||
2146 | /* Make a string from NCHARS characters occupying NBYTES bytes at | |
2147 | CONTENTS. The argument MULTIBYTE controls whether to label the | |
229b28c4 KH |
2148 | string as multibyte. If NCHARS is negative, it counts the number of |
2149 | characters by itself. */ | |
2e471eb5 GM |
2150 | |
2151 | Lisp_Object | |
14162469 | 2152 | make_specified_string (const char *contents, |
fce31d69 | 2153 | ptrdiff_t nchars, ptrdiff_t nbytes, bool multibyte) |
2e471eb5 | 2154 | { |
fce31d69 | 2155 | Lisp_Object val; |
229b28c4 KH |
2156 | |
2157 | if (nchars < 0) | |
2158 | { | |
2159 | if (multibyte) | |
90256841 PE |
2160 | nchars = multibyte_chars_in_text ((const unsigned char *) contents, |
2161 | nbytes); | |
229b28c4 KH |
2162 | else |
2163 | nchars = nbytes; | |
2164 | } | |
2e471eb5 | 2165 | val = make_uninit_multibyte_string (nchars, nbytes); |
72af86bd | 2166 | memcpy (SDATA (val), contents, nbytes); |
2e471eb5 | 2167 | if (!multibyte) |
d5db4077 | 2168 | STRING_SET_UNIBYTE (val); |
2e471eb5 GM |
2169 | return val; |
2170 | } | |
2171 | ||
2172 | ||
2e471eb5 GM |
2173 | /* Return an unibyte Lisp_String set up to hold LENGTH characters |
2174 | occupying LENGTH bytes. */ | |
2175 | ||
2176 | Lisp_Object | |
413d18e7 | 2177 | make_uninit_string (EMACS_INT length) |
2e471eb5 GM |
2178 | { |
2179 | Lisp_Object val; | |
4d774b0f JB |
2180 | |
2181 | if (!length) | |
2182 | return empty_unibyte_string; | |
2e471eb5 | 2183 | val = make_uninit_multibyte_string (length, length); |
d5db4077 | 2184 | STRING_SET_UNIBYTE (val); |
2e471eb5 GM |
2185 | return val; |
2186 | } | |
2187 | ||
2188 | ||
2189 | /* Return a multibyte Lisp_String set up to hold NCHARS characters | |
2190 | which occupy NBYTES bytes. */ | |
2191 | ||
2192 | Lisp_Object | |
413d18e7 | 2193 | make_uninit_multibyte_string (EMACS_INT nchars, EMACS_INT nbytes) |
2e471eb5 GM |
2194 | { |
2195 | Lisp_Object string; | |
2196 | struct Lisp_String *s; | |
2197 | ||
2198 | if (nchars < 0) | |
1088b922 | 2199 | emacs_abort (); |
4d774b0f JB |
2200 | if (!nbytes) |
2201 | return empty_multibyte_string; | |
2e471eb5 GM |
2202 | |
2203 | s = allocate_string (); | |
77c7bcb1 | 2204 | s->intervals = NULL; |
2e471eb5 GM |
2205 | allocate_string_data (s, nchars, nbytes); |
2206 | XSETSTRING (string, s); | |
2207 | string_chars_consed += nbytes; | |
2208 | return string; | |
2209 | } | |
2210 | ||
a8290ec3 DA |
2211 | /* Print arguments to BUF according to a FORMAT, then return |
2212 | a Lisp_String initialized with the data from BUF. */ | |
2213 | ||
2214 | Lisp_Object | |
2215 | make_formatted_string (char *buf, const char *format, ...) | |
2216 | { | |
2217 | va_list ap; | |
26bccfae | 2218 | int length; |
a8290ec3 DA |
2219 | |
2220 | va_start (ap, format); | |
2221 | length = vsprintf (buf, format, ap); | |
2222 | va_end (ap); | |
2223 | return make_string (buf, length); | |
2224 | } | |
2e471eb5 GM |
2225 | |
2226 | \f | |
2227 | /*********************************************************************** | |
2228 | Float Allocation | |
2229 | ***********************************************************************/ | |
2230 | ||
2e471eb5 GM |
2231 | /* We store float cells inside of float_blocks, allocating a new |
2232 | float_block with malloc whenever necessary. Float cells reclaimed | |
2233 | by GC are put on a free list to be reallocated before allocating | |
ab6780cd | 2234 | any new float cells from the latest float_block. */ |
2e471eb5 | 2235 | |
6b61353c KH |
2236 | #define FLOAT_BLOCK_SIZE \ |
2237 | (((BLOCK_BYTES - sizeof (struct float_block *) \ | |
2238 | /* The compiler might add padding at the end. */ \ | |
2239 | - (sizeof (struct Lisp_Float) - sizeof (int))) * CHAR_BIT) \ | |
ab6780cd SM |
2240 | / (sizeof (struct Lisp_Float) * CHAR_BIT + 1)) |
2241 | ||
2242 | #define GETMARKBIT(block,n) \ | |
5e617bc2 JB |
2243 | (((block)->gcmarkbits[(n) / (sizeof (int) * CHAR_BIT)] \ |
2244 | >> ((n) % (sizeof (int) * CHAR_BIT))) \ | |
ab6780cd SM |
2245 | & 1) |
2246 | ||
2247 | #define SETMARKBIT(block,n) \ | |
5e617bc2 JB |
2248 | (block)->gcmarkbits[(n) / (sizeof (int) * CHAR_BIT)] \ |
2249 | |= 1 << ((n) % (sizeof (int) * CHAR_BIT)) | |
ab6780cd SM |
2250 | |
2251 | #define UNSETMARKBIT(block,n) \ | |
5e617bc2 JB |
2252 | (block)->gcmarkbits[(n) / (sizeof (int) * CHAR_BIT)] \ |
2253 | &= ~(1 << ((n) % (sizeof (int) * CHAR_BIT))) | |
ab6780cd SM |
2254 | |
2255 | #define FLOAT_BLOCK(fptr) \ | |
d01a7826 | 2256 | ((struct float_block *) (((uintptr_t) (fptr)) & ~(BLOCK_ALIGN - 1))) |
ab6780cd SM |
2257 | |
2258 | #define FLOAT_INDEX(fptr) \ | |
d01a7826 | 2259 | ((((uintptr_t) (fptr)) & (BLOCK_ALIGN - 1)) / sizeof (struct Lisp_Float)) |
2e471eb5 GM |
2260 | |
2261 | struct float_block | |
2262 | { | |
ab6780cd | 2263 | /* Place `floats' at the beginning, to ease up FLOAT_INDEX's job. */ |
2e471eb5 | 2264 | struct Lisp_Float floats[FLOAT_BLOCK_SIZE]; |
5e617bc2 | 2265 | int gcmarkbits[1 + FLOAT_BLOCK_SIZE / (sizeof (int) * CHAR_BIT)]; |
ab6780cd | 2266 | struct float_block *next; |
2e471eb5 GM |
2267 | }; |
2268 | ||
ab6780cd SM |
2269 | #define FLOAT_MARKED_P(fptr) \ |
2270 | GETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr))) | |
2271 | ||
2272 | #define FLOAT_MARK(fptr) \ | |
2273 | SETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr))) | |
2274 | ||
2275 | #define FLOAT_UNMARK(fptr) \ | |
2276 | UNSETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr))) | |
2277 | ||
34400008 GM |
2278 | /* Current float_block. */ |
2279 | ||
244ed907 | 2280 | static struct float_block *float_block; |
34400008 GM |
2281 | |
2282 | /* Index of first unused Lisp_Float in the current float_block. */ | |
2283 | ||
fff62aa9 | 2284 | static int float_block_index = FLOAT_BLOCK_SIZE; |
2e471eb5 | 2285 | |
34400008 GM |
2286 | /* Free-list of Lisp_Floats. */ |
2287 | ||
244ed907 | 2288 | static struct Lisp_Float *float_free_list; |
2e471eb5 | 2289 | |
34400008 GM |
2290 | /* Return a new float object with value FLOAT_VALUE. */ |
2291 | ||
2e471eb5 | 2292 | Lisp_Object |
971de7fb | 2293 | make_float (double float_value) |
2e471eb5 GM |
2294 | { |
2295 | register Lisp_Object val; | |
2296 | ||
dafc79fa | 2297 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 2298 | |
2e471eb5 GM |
2299 | if (float_free_list) |
2300 | { | |
2301 | /* We use the data field for chaining the free list | |
2302 | so that we won't use the same field that has the mark bit. */ | |
2303 | XSETFLOAT (val, float_free_list); | |
28a099a4 | 2304 | float_free_list = float_free_list->u.chain; |
2e471eb5 GM |
2305 | } |
2306 | else | |
2307 | { | |
2308 | if (float_block_index == FLOAT_BLOCK_SIZE) | |
2309 | { | |
38182d90 PE |
2310 | struct float_block *new |
2311 | = lisp_align_malloc (sizeof *new, MEM_TYPE_FLOAT); | |
2e471eb5 | 2312 | new->next = float_block; |
72af86bd | 2313 | memset (new->gcmarkbits, 0, sizeof new->gcmarkbits); |
2e471eb5 GM |
2314 | float_block = new; |
2315 | float_block_index = 0; | |
3900d5de | 2316 | total_free_floats += FLOAT_BLOCK_SIZE; |
2e471eb5 | 2317 | } |
6b61353c KH |
2318 | XSETFLOAT (val, &float_block->floats[float_block_index]); |
2319 | float_block_index++; | |
2e471eb5 | 2320 | } |
177c0ea7 | 2321 | |
dafc79fa | 2322 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 2323 | |
f601cdf3 | 2324 | XFLOAT_INIT (val, float_value); |
6b61353c | 2325 | eassert (!FLOAT_MARKED_P (XFLOAT (val))); |
2e471eb5 GM |
2326 | consing_since_gc += sizeof (struct Lisp_Float); |
2327 | floats_consed++; | |
3900d5de | 2328 | total_free_floats--; |
2e471eb5 GM |
2329 | return val; |
2330 | } | |
2331 | ||
2e471eb5 GM |
2332 | |
2333 | \f | |
2334 | /*********************************************************************** | |
2335 | Cons Allocation | |
2336 | ***********************************************************************/ | |
2337 | ||
2338 | /* We store cons cells inside of cons_blocks, allocating a new | |
2339 | cons_block with malloc whenever necessary. Cons cells reclaimed by | |
2340 | GC are put on a free list to be reallocated before allocating | |
08b7c2cb | 2341 | any new cons cells from the latest cons_block. */ |
2e471eb5 | 2342 | |
a2821611 AS |
2343 | #define CONS_BLOCK_SIZE \ |
2344 | (((BLOCK_BYTES - sizeof (struct cons_block *) \ | |
2345 | /* The compiler might add padding at the end. */ \ | |
2346 | - (sizeof (struct Lisp_Cons) - sizeof (int))) * CHAR_BIT) \ | |
08b7c2cb SM |
2347 | / (sizeof (struct Lisp_Cons) * CHAR_BIT + 1)) |
2348 | ||
2349 | #define CONS_BLOCK(fptr) \ | |
d01a7826 | 2350 | ((struct cons_block *) ((uintptr_t) (fptr) & ~(BLOCK_ALIGN - 1))) |
08b7c2cb SM |
2351 | |
2352 | #define CONS_INDEX(fptr) \ | |
d01a7826 | 2353 | (((uintptr_t) (fptr) & (BLOCK_ALIGN - 1)) / sizeof (struct Lisp_Cons)) |
2e471eb5 GM |
2354 | |
2355 | struct cons_block | |
2356 | { | |
08b7c2cb | 2357 | /* Place `conses' at the beginning, to ease up CONS_INDEX's job. */ |
2e471eb5 | 2358 | struct Lisp_Cons conses[CONS_BLOCK_SIZE]; |
5e617bc2 | 2359 | int gcmarkbits[1 + CONS_BLOCK_SIZE / (sizeof (int) * CHAR_BIT)]; |
08b7c2cb | 2360 | struct cons_block *next; |
2e471eb5 GM |
2361 | }; |
2362 | ||
08b7c2cb SM |
2363 | #define CONS_MARKED_P(fptr) \ |
2364 | GETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr))) | |
2365 | ||
2366 | #define CONS_MARK(fptr) \ | |
2367 | SETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr))) | |
2368 | ||
2369 | #define CONS_UNMARK(fptr) \ | |
2370 | UNSETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr))) | |
2371 | ||
34400008 GM |
2372 | /* Current cons_block. */ |
2373 | ||
244ed907 | 2374 | static struct cons_block *cons_block; |
34400008 GM |
2375 | |
2376 | /* Index of first unused Lisp_Cons in the current block. */ | |
2377 | ||
fff62aa9 | 2378 | static int cons_block_index = CONS_BLOCK_SIZE; |
2e471eb5 | 2379 | |
34400008 GM |
2380 | /* Free-list of Lisp_Cons structures. */ |
2381 | ||
244ed907 | 2382 | static struct Lisp_Cons *cons_free_list; |
2e471eb5 | 2383 | |
34400008 | 2384 | /* Explicitly free a cons cell by putting it on the free-list. */ |
2e471eb5 GM |
2385 | |
2386 | void | |
971de7fb | 2387 | free_cons (struct Lisp_Cons *ptr) |
2e471eb5 | 2388 | { |
28a099a4 | 2389 | ptr->u.chain = cons_free_list; |
34400008 | 2390 | #if GC_MARK_STACK |
c644523b | 2391 | ptr->car = Vdead; |
34400008 | 2392 | #endif |
2e471eb5 | 2393 | cons_free_list = ptr; |
0dd6d66d | 2394 | consing_since_gc -= sizeof *ptr; |
3900d5de | 2395 | total_free_conses++; |
2e471eb5 GM |
2396 | } |
2397 | ||
a7ca3326 | 2398 | DEFUN ("cons", Fcons, Scons, 2, 2, 0, |
a6266d23 | 2399 | doc: /* Create a new cons, give it CAR and CDR as components, and return it. */) |
5842a27b | 2400 | (Lisp_Object car, Lisp_Object cdr) |
2e471eb5 GM |
2401 | { |
2402 | register Lisp_Object val; | |
2403 | ||
dafc79fa | 2404 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 2405 | |
2e471eb5 GM |
2406 | if (cons_free_list) |
2407 | { | |
2408 | /* We use the cdr for chaining the free list | |
2409 | so that we won't use the same field that has the mark bit. */ | |
2410 | XSETCONS (val, cons_free_list); | |
28a099a4 | 2411 | cons_free_list = cons_free_list->u.chain; |
2e471eb5 GM |
2412 | } |
2413 | else | |
2414 | { | |
2415 | if (cons_block_index == CONS_BLOCK_SIZE) | |
2416 | { | |
38182d90 PE |
2417 | struct cons_block *new |
2418 | = lisp_align_malloc (sizeof *new, MEM_TYPE_CONS); | |
72af86bd | 2419 | memset (new->gcmarkbits, 0, sizeof new->gcmarkbits); |
2e471eb5 GM |
2420 | new->next = cons_block; |
2421 | cons_block = new; | |
2422 | cons_block_index = 0; | |
3900d5de | 2423 | total_free_conses += CONS_BLOCK_SIZE; |
2e471eb5 | 2424 | } |
6b61353c KH |
2425 | XSETCONS (val, &cons_block->conses[cons_block_index]); |
2426 | cons_block_index++; | |
2e471eb5 | 2427 | } |
177c0ea7 | 2428 | |
dafc79fa | 2429 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 2430 | |
f3fbd155 KR |
2431 | XSETCAR (val, car); |
2432 | XSETCDR (val, cdr); | |
6b61353c | 2433 | eassert (!CONS_MARKED_P (XCONS (val))); |
2e471eb5 | 2434 | consing_since_gc += sizeof (struct Lisp_Cons); |
3900d5de | 2435 | total_free_conses--; |
2e471eb5 GM |
2436 | cons_cells_consed++; |
2437 | return val; | |
2438 | } | |
2439 | ||
e5aab7e7 | 2440 | #ifdef GC_CHECK_CONS_LIST |
e3e56238 RS |
2441 | /* Get an error now if there's any junk in the cons free list. */ |
2442 | void | |
971de7fb | 2443 | check_cons_list (void) |
e3e56238 RS |
2444 | { |
2445 | struct Lisp_Cons *tail = cons_free_list; | |
2446 | ||
e3e56238 | 2447 | while (tail) |
28a099a4 | 2448 | tail = tail->u.chain; |
e3e56238 | 2449 | } |
e5aab7e7 | 2450 | #endif |
34400008 | 2451 | |
9b306d37 KS |
2452 | /* Make a list of 1, 2, 3, 4 or 5 specified objects. */ |
2453 | ||
2454 | Lisp_Object | |
971de7fb | 2455 | list1 (Lisp_Object arg1) |
9b306d37 KS |
2456 | { |
2457 | return Fcons (arg1, Qnil); | |
2458 | } | |
2e471eb5 GM |
2459 | |
2460 | Lisp_Object | |
971de7fb | 2461 | list2 (Lisp_Object arg1, Lisp_Object arg2) |
2e471eb5 GM |
2462 | { |
2463 | return Fcons (arg1, Fcons (arg2, Qnil)); | |
2464 | } | |
2465 | ||
34400008 | 2466 | |
2e471eb5 | 2467 | Lisp_Object |
971de7fb | 2468 | list3 (Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
2e471eb5 GM |
2469 | { |
2470 | return Fcons (arg1, Fcons (arg2, Fcons (arg3, Qnil))); | |
2471 | } | |
2472 | ||
34400008 | 2473 | |
2e471eb5 | 2474 | Lisp_Object |
971de7fb | 2475 | list4 (Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, Lisp_Object arg4) |
2e471eb5 GM |
2476 | { |
2477 | return Fcons (arg1, Fcons (arg2, Fcons (arg3, Fcons (arg4, Qnil)))); | |
2478 | } | |
2479 | ||
34400008 | 2480 | |
2e471eb5 | 2481 | Lisp_Object |
971de7fb | 2482 | list5 (Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, Lisp_Object arg4, Lisp_Object arg5) |
2e471eb5 GM |
2483 | { |
2484 | return Fcons (arg1, Fcons (arg2, Fcons (arg3, Fcons (arg4, | |
2485 | Fcons (arg5, Qnil))))); | |
2486 | } | |
2487 | ||
694b6c97 DA |
2488 | /* Make a list of COUNT Lisp_Objects, where ARG is the |
2489 | first one. Allocate conses from pure space if TYPE | |
3438fe21 | 2490 | is CONSTYPE_PURE, or allocate as usual if type is CONSTYPE_HEAP. */ |
694b6c97 DA |
2491 | |
2492 | Lisp_Object | |
2493 | listn (enum constype type, ptrdiff_t count, Lisp_Object arg, ...) | |
2494 | { | |
2495 | va_list ap; | |
2496 | ptrdiff_t i; | |
2497 | Lisp_Object val, *objp; | |
2498 | ||
2499 | /* Change to SAFE_ALLOCA if you hit this eassert. */ | |
663e2b3f | 2500 | eassert (count <= MAX_ALLOCA / word_size); |
694b6c97 | 2501 | |
663e2b3f | 2502 | objp = alloca (count * word_size); |
694b6c97 DA |
2503 | objp[0] = arg; |
2504 | va_start (ap, arg); | |
2505 | for (i = 1; i < count; i++) | |
2506 | objp[i] = va_arg (ap, Lisp_Object); | |
2507 | va_end (ap); | |
2508 | ||
bcfbc9de | 2509 | for (val = Qnil, i = count - 1; i >= 0; i--) |
694b6c97 | 2510 | { |
3438fe21 | 2511 | if (type == CONSTYPE_PURE) |
694b6c97 | 2512 | val = pure_cons (objp[i], val); |
3438fe21 | 2513 | else if (type == CONSTYPE_HEAP) |
694b6c97 DA |
2514 | val = Fcons (objp[i], val); |
2515 | else | |
1088b922 | 2516 | emacs_abort (); |
694b6c97 DA |
2517 | } |
2518 | return val; | |
2519 | } | |
34400008 | 2520 | |
a7ca3326 | 2521 | DEFUN ("list", Flist, Slist, 0, MANY, 0, |
eae936e2 | 2522 | doc: /* Return a newly created list with specified arguments as elements. |
ae8e8122 MB |
2523 | Any number of arguments, even zero arguments, are allowed. |
2524 | usage: (list &rest OBJECTS) */) | |
f66c7cf8 | 2525 | (ptrdiff_t nargs, Lisp_Object *args) |
2e471eb5 GM |
2526 | { |
2527 | register Lisp_Object val; | |
2528 | val = Qnil; | |
2529 | ||
2530 | while (nargs > 0) | |
2531 | { | |
2532 | nargs--; | |
2533 | val = Fcons (args[nargs], val); | |
2534 | } | |
2535 | return val; | |
2536 | } | |
2537 | ||
34400008 | 2538 | |
a7ca3326 | 2539 | DEFUN ("make-list", Fmake_list, Smake_list, 2, 2, 0, |
a6266d23 | 2540 | doc: /* Return a newly created list of length LENGTH, with each element being INIT. */) |
5842a27b | 2541 | (register Lisp_Object length, Lisp_Object init) |
2e471eb5 GM |
2542 | { |
2543 | register Lisp_Object val; | |
14162469 | 2544 | register EMACS_INT size; |
2e471eb5 | 2545 | |
b7826503 | 2546 | CHECK_NATNUM (length); |
2e471eb5 GM |
2547 | size = XFASTINT (length); |
2548 | ||
2549 | val = Qnil; | |
ce070307 GM |
2550 | while (size > 0) |
2551 | { | |
2552 | val = Fcons (init, val); | |
2553 | --size; | |
2554 | ||
2555 | if (size > 0) | |
2556 | { | |
2557 | val = Fcons (init, val); | |
2558 | --size; | |
177c0ea7 | 2559 | |
ce070307 GM |
2560 | if (size > 0) |
2561 | { | |
2562 | val = Fcons (init, val); | |
2563 | --size; | |
177c0ea7 | 2564 | |
ce070307 GM |
2565 | if (size > 0) |
2566 | { | |
2567 | val = Fcons (init, val); | |
2568 | --size; | |
177c0ea7 | 2569 | |
ce070307 GM |
2570 | if (size > 0) |
2571 | { | |
2572 | val = Fcons (init, val); | |
2573 | --size; | |
2574 | } | |
2575 | } | |
2576 | } | |
2577 | } | |
2578 | ||
2579 | QUIT; | |
2580 | } | |
177c0ea7 | 2581 | |
7146af97 JB |
2582 | return val; |
2583 | } | |
2e471eb5 GM |
2584 | |
2585 | ||
7146af97 | 2586 | \f |
2e471eb5 GM |
2587 | /*********************************************************************** |
2588 | Vector Allocation | |
2589 | ***********************************************************************/ | |
7146af97 | 2590 | |
f3372c87 DA |
2591 | /* This value is balanced well enough to avoid too much internal overhead |
2592 | for the most common cases; it's not required to be a power of two, but | |
2593 | it's expected to be a mult-of-ROUNDUP_SIZE (see below). */ | |
34400008 | 2594 | |
f3372c87 | 2595 | #define VECTOR_BLOCK_SIZE 4096 |
7146af97 | 2596 | |
d06714cb | 2597 | /* Align allocation request sizes to be a multiple of ROUNDUP_SIZE. */ |
dd0b0efb PE |
2598 | enum |
2599 | { | |
2b90362b | 2600 | roundup_size = COMMON_MULTIPLE (word_size, USE_LSB_TAG ? GCALIGNMENT : 1) |
dd0b0efb | 2601 | }; |
34400008 | 2602 | |
ca95b3eb DA |
2603 | /* Verify assumptions described above. */ |
2604 | verify ((VECTOR_BLOCK_SIZE % roundup_size) == 0); | |
ee28be33 | 2605 | verify (VECTOR_BLOCK_SIZE <= (1 << PSEUDOVECTOR_SIZE_BITS)); |
ca95b3eb | 2606 | |
3e0b94e7 DC |
2607 | /* Round up X to nearest mult-of-ROUNDUP_SIZE --- use at compile time. */ |
2608 | #define vroundup_ct(x) ROUNDUP((size_t)(x), roundup_size) | |
2609 | /* Round up X to nearest mult-of-ROUNDUP_SIZE --- use at runtime. */ | |
2610 | #define vroundup(x) (assume((x) >= 0), vroundup_ct(x)) | |
f3372c87 DA |
2611 | |
2612 | /* Rounding helps to maintain alignment constraints if USE_LSB_TAG. */ | |
2613 | ||
3e0b94e7 | 2614 | #define VECTOR_BLOCK_BYTES (VECTOR_BLOCK_SIZE - vroundup_ct (sizeof (void *))) |
f3372c87 DA |
2615 | |
2616 | /* Size of the minimal vector allocated from block. */ | |
2617 | ||
3e0b94e7 | 2618 | #define VBLOCK_BYTES_MIN vroundup_ct (header_size + sizeof (Lisp_Object)) |
f3372c87 DA |
2619 | |
2620 | /* Size of the largest vector allocated from block. */ | |
2621 | ||
2622 | #define VBLOCK_BYTES_MAX \ | |
d06714cb | 2623 | vroundup ((VECTOR_BLOCK_BYTES / 2) - word_size) |
f3372c87 DA |
2624 | |
2625 | /* We maintain one free list for each possible block-allocated | |
2626 | vector size, and this is the number of free lists we have. */ | |
2627 | ||
2628 | #define VECTOR_MAX_FREE_LIST_INDEX \ | |
2629 | ((VECTOR_BLOCK_BYTES - VBLOCK_BYTES_MIN) / roundup_size + 1) | |
2630 | ||
f3372c87 DA |
2631 | /* Common shortcut to advance vector pointer over a block data. */ |
2632 | ||
2633 | #define ADVANCE(v, nbytes) ((struct Lisp_Vector *) ((char *) (v) + (nbytes))) | |
2634 | ||
2635 | /* Common shortcut to calculate NBYTES-vector index in VECTOR_FREE_LISTS. */ | |
2636 | ||
2637 | #define VINDEX(nbytes) (((nbytes) - VBLOCK_BYTES_MIN) / roundup_size) | |
2638 | ||
76ae24d7 PE |
2639 | /* Get and set the next field in block-allocated vectorlike objects on |
2640 | the free list. Doing it this way respects C's aliasing rules. | |
2641 | We could instead make 'contents' a union, but that would mean | |
2642 | changes everywhere that the code uses 'contents'. */ | |
2643 | static struct Lisp_Vector * | |
2644 | next_in_free_list (struct Lisp_Vector *v) | |
7d377c48 | 2645 | { |
76ae24d7 PE |
2646 | intptr_t i = XLI (v->contents[0]); |
2647 | return (struct Lisp_Vector *) i; | |
2648 | } | |
2649 | static void | |
2650 | set_next_in_free_list (struct Lisp_Vector *v, struct Lisp_Vector *next) | |
2651 | { | |
2652 | v->contents[0] = XIL ((intptr_t) next); | |
2653 | } | |
914adc42 | 2654 | |
f3372c87 DA |
2655 | /* Common shortcut to setup vector on a free list. */ |
2656 | ||
914adc42 DA |
2657 | #define SETUP_ON_FREE_LIST(v, nbytes, tmp) \ |
2658 | do { \ | |
2659 | (tmp) = ((nbytes - header_size) / word_size); \ | |
2660 | XSETPVECTYPESIZE (v, PVEC_FREE, 0, (tmp)); \ | |
2661 | eassert ((nbytes) % roundup_size == 0); \ | |
2662 | (tmp) = VINDEX (nbytes); \ | |
2663 | eassert ((tmp) < VECTOR_MAX_FREE_LIST_INDEX); \ | |
76ae24d7 | 2664 | set_next_in_free_list (v, vector_free_lists[tmp]); \ |
914adc42 DA |
2665 | vector_free_lists[tmp] = (v); \ |
2666 | total_free_vector_slots += (nbytes) / word_size; \ | |
f3372c87 DA |
2667 | } while (0) |
2668 | ||
914adc42 DA |
2669 | /* This internal type is used to maintain the list of large vectors |
2670 | which are allocated at their own, e.g. outside of vector blocks. */ | |
2671 | ||
2672 | struct large_vector | |
2673 | { | |
2674 | union { | |
2675 | struct large_vector *vector; | |
2676 | #if USE_LSB_TAG | |
2677 | /* We need to maintain ROUNDUP_SIZE alignment for the vector member. */ | |
3e0b94e7 | 2678 | unsigned char c[vroundup_ct (sizeof (struct large_vector *))]; |
914adc42 DA |
2679 | #endif |
2680 | } next; | |
2681 | struct Lisp_Vector v; | |
2682 | }; | |
2683 | ||
2684 | /* This internal type is used to maintain an underlying storage | |
2685 | for small vectors. */ | |
2686 | ||
f3372c87 DA |
2687 | struct vector_block |
2688 | { | |
2689 | char data[VECTOR_BLOCK_BYTES]; | |
2690 | struct vector_block *next; | |
2691 | }; | |
2692 | ||
2693 | /* Chain of vector blocks. */ | |
2694 | ||
2695 | static struct vector_block *vector_blocks; | |
2696 | ||
2697 | /* Vector free lists, where NTH item points to a chain of free | |
2698 | vectors of the same NBYTES size, so NTH == VINDEX (NBYTES). */ | |
2699 | ||
2700 | static struct Lisp_Vector *vector_free_lists[VECTOR_MAX_FREE_LIST_INDEX]; | |
2701 | ||
2702 | /* Singly-linked list of large vectors. */ | |
2703 | ||
914adc42 | 2704 | static struct large_vector *large_vectors; |
f3372c87 DA |
2705 | |
2706 | /* The only vector with 0 slots, allocated from pure space. */ | |
2707 | ||
9730daca | 2708 | Lisp_Object zero_vector; |
f3372c87 | 2709 | |
3ab6e069 DA |
2710 | /* Number of live vectors. */ |
2711 | ||
2712 | static EMACS_INT total_vectors; | |
2713 | ||
5b835e1d | 2714 | /* Total size of live and free vectors, in Lisp_Object units. */ |
3ab6e069 | 2715 | |
5b835e1d | 2716 | static EMACS_INT total_vector_slots, total_free_vector_slots; |
3ab6e069 | 2717 | |
f3372c87 DA |
2718 | /* Get a new vector block. */ |
2719 | ||
2720 | static struct vector_block * | |
2721 | allocate_vector_block (void) | |
2722 | { | |
38182d90 | 2723 | struct vector_block *block = xmalloc (sizeof *block); |
f3372c87 DA |
2724 | |
2725 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK | |
2726 | mem_insert (block->data, block->data + VECTOR_BLOCK_BYTES, | |
2727 | MEM_TYPE_VECTOR_BLOCK); | |
2728 | #endif | |
2729 | ||
2730 | block->next = vector_blocks; | |
2731 | vector_blocks = block; | |
2732 | return block; | |
2733 | } | |
2734 | ||
2735 | /* Called once to initialize vector allocation. */ | |
2736 | ||
2737 | static void | |
2738 | init_vectors (void) | |
2739 | { | |
9730daca | 2740 | zero_vector = make_pure_vector (0); |
f3372c87 DA |
2741 | } |
2742 | ||
2743 | /* Allocate vector from a vector block. */ | |
2744 | ||
2745 | static struct Lisp_Vector * | |
2746 | allocate_vector_from_block (size_t nbytes) | |
2747 | { | |
914adc42 | 2748 | struct Lisp_Vector *vector; |
f3372c87 DA |
2749 | struct vector_block *block; |
2750 | size_t index, restbytes; | |
2751 | ||
2752 | eassert (VBLOCK_BYTES_MIN <= nbytes && nbytes <= VBLOCK_BYTES_MAX); | |
2753 | eassert (nbytes % roundup_size == 0); | |
2754 | ||
2755 | /* First, try to allocate from a free list | |
2756 | containing vectors of the requested size. */ | |
2757 | index = VINDEX (nbytes); | |
2758 | if (vector_free_lists[index]) | |
2759 | { | |
2760 | vector = vector_free_lists[index]; | |
76ae24d7 | 2761 | vector_free_lists[index] = next_in_free_list (vector); |
5b835e1d | 2762 | total_free_vector_slots -= nbytes / word_size; |
f3372c87 DA |
2763 | return vector; |
2764 | } | |
2765 | ||
2766 | /* Next, check free lists containing larger vectors. Since | |
2767 | we will split the result, we should have remaining space | |
2768 | large enough to use for one-slot vector at least. */ | |
2769 | for (index = VINDEX (nbytes + VBLOCK_BYTES_MIN); | |
2770 | index < VECTOR_MAX_FREE_LIST_INDEX; index++) | |
2771 | if (vector_free_lists[index]) | |
2772 | { | |
2773 | /* This vector is larger than requested. */ | |
2774 | vector = vector_free_lists[index]; | |
76ae24d7 | 2775 | vector_free_lists[index] = next_in_free_list (vector); |
5b835e1d | 2776 | total_free_vector_slots -= nbytes / word_size; |
f3372c87 DA |
2777 | |
2778 | /* Excess bytes are used for the smaller vector, | |
2779 | which should be set on an appropriate free list. */ | |
2780 | restbytes = index * roundup_size + VBLOCK_BYTES_MIN - nbytes; | |
2781 | eassert (restbytes % roundup_size == 0); | |
914adc42 | 2782 | SETUP_ON_FREE_LIST (ADVANCE (vector, nbytes), restbytes, index); |
f3372c87 DA |
2783 | return vector; |
2784 | } | |
2785 | ||
2786 | /* Finally, need a new vector block. */ | |
2787 | block = allocate_vector_block (); | |
2788 | ||
2789 | /* New vector will be at the beginning of this block. */ | |
2790 | vector = (struct Lisp_Vector *) block->data; | |
f3372c87 DA |
2791 | |
2792 | /* If the rest of space from this block is large enough | |
2793 | for one-slot vector at least, set up it on a free list. */ | |
2794 | restbytes = VECTOR_BLOCK_BYTES - nbytes; | |
2795 | if (restbytes >= VBLOCK_BYTES_MIN) | |
2796 | { | |
2797 | eassert (restbytes % roundup_size == 0); | |
914adc42 | 2798 | SETUP_ON_FREE_LIST (ADVANCE (vector, nbytes), restbytes, index); |
f3372c87 DA |
2799 | } |
2800 | return vector; | |
914adc42 | 2801 | } |
f3372c87 | 2802 | |
f3372c87 DA |
2803 | /* Nonzero if VECTOR pointer is valid pointer inside BLOCK. */ |
2804 | ||
2805 | #define VECTOR_IN_BLOCK(vector, block) \ | |
2806 | ((char *) (vector) <= (block)->data \ | |
2807 | + VECTOR_BLOCK_BYTES - VBLOCK_BYTES_MIN) | |
2808 | ||
914adc42 | 2809 | /* Return the memory footprint of V in bytes. */ |
ee28be33 | 2810 | |
914adc42 DA |
2811 | static ptrdiff_t |
2812 | vector_nbytes (struct Lisp_Vector *v) | |
2813 | { | |
2814 | ptrdiff_t size = v->header.size & ~ARRAY_MARK_FLAG; | |
2815 | ||
2816 | if (size & PSEUDOVECTOR_FLAG) | |
2817 | { | |
2818 | if (PSEUDOVECTOR_TYPEP (&v->header, PVEC_BOOL_VECTOR)) | |
3e0b94e7 DC |
2819 | { |
2820 | struct Lisp_Bool_Vector *bv = (struct Lisp_Bool_Vector *) v; | |
2821 | ptrdiff_t payload_bytes = | |
2822 | bool_vector_payload_bytes (bv->size, NULL); | |
2823 | ||
2824 | eassert_and_assume (payload_bytes >= 0); | |
2825 | size = bool_header_size + ROUNDUP (payload_bytes, word_size); | |
2826 | } | |
914adc42 DA |
2827 | else |
2828 | size = (header_size | |
2829 | + ((size & PSEUDOVECTOR_SIZE_MASK) | |
2830 | + ((size & PSEUDOVECTOR_REST_MASK) | |
2831 | >> PSEUDOVECTOR_SIZE_BITS)) * word_size); | |
2832 | } | |
2833 | else | |
2834 | size = header_size + size * word_size; | |
2835 | return vroundup (size); | |
2836 | } | |
ee28be33 | 2837 | |
f3372c87 DA |
2838 | /* Reclaim space used by unmarked vectors. */ |
2839 | ||
2840 | static void | |
2841 | sweep_vectors (void) | |
2842 | { | |
1570ae92 | 2843 | struct vector_block *block, **bprev = &vector_blocks; |
914adc42 DA |
2844 | struct large_vector *lv, **lvprev = &large_vectors; |
2845 | struct Lisp_Vector *vector, *next; | |
f3372c87 | 2846 | |
5b835e1d | 2847 | total_vectors = total_vector_slots = total_free_vector_slots = 0; |
f3372c87 DA |
2848 | memset (vector_free_lists, 0, sizeof (vector_free_lists)); |
2849 | ||
2850 | /* Looking through vector blocks. */ | |
2851 | ||
2852 | for (block = vector_blocks; block; block = *bprev) | |
2853 | { | |
fce31d69 | 2854 | bool free_this_block = 0; |
914adc42 | 2855 | ptrdiff_t nbytes; |
f3372c87 DA |
2856 | |
2857 | for (vector = (struct Lisp_Vector *) block->data; | |
2858 | VECTOR_IN_BLOCK (vector, block); vector = next) | |
2859 | { | |
2860 | if (VECTOR_MARKED_P (vector)) | |
2861 | { | |
2862 | VECTOR_UNMARK (vector); | |
3ab6e069 | 2863 | total_vectors++; |
914adc42 DA |
2864 | nbytes = vector_nbytes (vector); |
2865 | total_vector_slots += nbytes / word_size; | |
2866 | next = ADVANCE (vector, nbytes); | |
f3372c87 DA |
2867 | } |
2868 | else | |
2869 | { | |
914adc42 | 2870 | ptrdiff_t total_bytes; |
f3372c87 | 2871 | |
914adc42 DA |
2872 | nbytes = vector_nbytes (vector); |
2873 | total_bytes = nbytes; | |
ee28be33 | 2874 | next = ADVANCE (vector, nbytes); |
f3372c87 DA |
2875 | |
2876 | /* While NEXT is not marked, try to coalesce with VECTOR, | |
2877 | thus making VECTOR of the largest possible size. */ | |
2878 | ||
2879 | while (VECTOR_IN_BLOCK (next, block)) | |
2880 | { | |
2881 | if (VECTOR_MARKED_P (next)) | |
2882 | break; | |
914adc42 | 2883 | nbytes = vector_nbytes (next); |
ee28be33 | 2884 | total_bytes += nbytes; |
f3372c87 DA |
2885 | next = ADVANCE (next, nbytes); |
2886 | } | |
bfe3e0a2 | 2887 | |
ee28be33 | 2888 | eassert (total_bytes % roundup_size == 0); |
f3372c87 DA |
2889 | |
2890 | if (vector == (struct Lisp_Vector *) block->data | |
2891 | && !VECTOR_IN_BLOCK (next, block)) | |
2892 | /* This block should be freed because all of it's | |
2893 | space was coalesced into the only free vector. */ | |
2894 | free_this_block = 1; | |
2895 | else | |
ee28be33 SM |
2896 | { |
2897 | int tmp; | |
2898 | SETUP_ON_FREE_LIST (vector, total_bytes, tmp); | |
2899 | } | |
f3372c87 DA |
2900 | } |
2901 | } | |
2902 | ||
2903 | if (free_this_block) | |
2904 | { | |
2905 | *bprev = block->next; | |
2906 | #if GC_MARK_STACK && !defined GC_MALLOC_CHECK | |
2907 | mem_delete (mem_find (block->data)); | |
2908 | #endif | |
2909 | xfree (block); | |
2910 | } | |
2911 | else | |
2912 | bprev = &block->next; | |
2913 | } | |
2914 | ||
2915 | /* Sweep large vectors. */ | |
2916 | ||
914adc42 | 2917 | for (lv = large_vectors; lv; lv = *lvprev) |
f3372c87 | 2918 | { |
914adc42 | 2919 | vector = &lv->v; |
f3372c87 DA |
2920 | if (VECTOR_MARKED_P (vector)) |
2921 | { | |
2922 | VECTOR_UNMARK (vector); | |
3ab6e069 | 2923 | total_vectors++; |
169925ec DA |
2924 | if (vector->header.size & PSEUDOVECTOR_FLAG) |
2925 | { | |
d06714cb PE |
2926 | /* All non-bool pseudovectors are small enough to be allocated |
2927 | from vector blocks. This code should be redesigned if some | |
2928 | pseudovector type grows beyond VBLOCK_BYTES_MAX. */ | |
2929 | eassert (PSEUDOVECTOR_TYPEP (&vector->header, PVEC_BOOL_VECTOR)); | |
3e0b94e7 | 2930 | total_vector_slots += vector_nbytes (vector) / word_size; |
169925ec DA |
2931 | } |
2932 | else | |
5b835e1d DA |
2933 | total_vector_slots |
2934 | += header_size / word_size + vector->header.size; | |
914adc42 | 2935 | lvprev = &lv->next.vector; |
f3372c87 DA |
2936 | } |
2937 | else | |
2938 | { | |
914adc42 DA |
2939 | *lvprev = lv->next.vector; |
2940 | lisp_free (lv); | |
f3372c87 DA |
2941 | } |
2942 | } | |
2943 | } | |
2944 | ||
34400008 GM |
2945 | /* Value is a pointer to a newly allocated Lisp_Vector structure |
2946 | with room for LEN Lisp_Objects. */ | |
2947 | ||
ece93c02 | 2948 | static struct Lisp_Vector * |
d311d28c | 2949 | allocate_vectorlike (ptrdiff_t len) |
1825c68d KH |
2950 | { |
2951 | struct Lisp_Vector *p; | |
2952 | ||
dafc79fa SM |
2953 | MALLOC_BLOCK_INPUT; |
2954 | ||
f3372c87 | 2955 | if (len == 0) |
9730daca | 2956 | p = XVECTOR (zero_vector); |
d12e8f5a | 2957 | else |
8bbbc977 | 2958 | { |
d12e8f5a | 2959 | size_t nbytes = header_size + len * word_size; |
f3372c87 | 2960 | |
d12e8f5a DA |
2961 | #ifdef DOUG_LEA_MALLOC |
2962 | /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed | |
2963 | because mapped region contents are not preserved in | |
2964 | a dumped Emacs. */ | |
2965 | mallopt (M_MMAP_MAX, 0); | |
2966 | #endif | |
f3372c87 | 2967 | |
d12e8f5a DA |
2968 | if (nbytes <= VBLOCK_BYTES_MAX) |
2969 | p = allocate_vector_from_block (vroundup (nbytes)); | |
2970 | else | |
2971 | { | |
914adc42 | 2972 | struct large_vector *lv |
fbe9e0b9 PE |
2973 | = lisp_malloc ((offsetof (struct large_vector, v.contents) |
2974 | + len * word_size), | |
914adc42 DA |
2975 | MEM_TYPE_VECTORLIKE); |
2976 | lv->next.vector = large_vectors; | |
2977 | large_vectors = lv; | |
2978 | p = &lv->v; | |
d12e8f5a | 2979 | } |
177c0ea7 | 2980 | |
d1658221 | 2981 | #ifdef DOUG_LEA_MALLOC |
d12e8f5a DA |
2982 | /* Back to a reasonable maximum of mmap'ed areas. */ |
2983 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); | |
d1658221 | 2984 | #endif |
177c0ea7 | 2985 | |
d12e8f5a DA |
2986 | consing_since_gc += nbytes; |
2987 | vector_cells_consed += len; | |
2988 | } | |
1825c68d | 2989 | |
dafc79fa | 2990 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 2991 | |
1825c68d KH |
2992 | return p; |
2993 | } | |
2994 | ||
34400008 | 2995 | |
dd0b0efb | 2996 | /* Allocate a vector with LEN slots. */ |
ece93c02 GM |
2997 | |
2998 | struct Lisp_Vector * | |
dd0b0efb | 2999 | allocate_vector (EMACS_INT len) |
ece93c02 | 3000 | { |
dd0b0efb PE |
3001 | struct Lisp_Vector *v; |
3002 | ptrdiff_t nbytes_max = min (PTRDIFF_MAX, SIZE_MAX); | |
3003 | ||
3004 | if (min ((nbytes_max - header_size) / word_size, MOST_POSITIVE_FIXNUM) < len) | |
3005 | memory_full (SIZE_MAX); | |
3006 | v = allocate_vectorlike (len); | |
3007 | v->header.size = len; | |
ece93c02 GM |
3008 | return v; |
3009 | } | |
3010 | ||
3011 | ||
3012 | /* Allocate other vector-like structures. */ | |
3013 | ||
30f95089 | 3014 | struct Lisp_Vector * |
914adc42 | 3015 | allocate_pseudovector (int memlen, int lisplen, enum pvec_type tag) |
ece93c02 | 3016 | { |
d2029e5b | 3017 | struct Lisp_Vector *v = allocate_vectorlike (memlen); |
e46bb31a | 3018 | int i; |
177c0ea7 | 3019 | |
914adc42 DA |
3020 | /* Catch bogus values. */ |
3021 | eassert (tag <= PVEC_FONT); | |
3022 | eassert (memlen - lisplen <= (1 << PSEUDOVECTOR_REST_BITS) - 1); | |
3023 | eassert (lisplen <= (1 << PSEUDOVECTOR_SIZE_BITS) - 1); | |
3024 | ||
d2029e5b | 3025 | /* Only the first lisplen slots will be traced normally by the GC. */ |
d2029e5b | 3026 | for (i = 0; i < lisplen; ++i) |
ece93c02 | 3027 | v->contents[i] = Qnil; |
177c0ea7 | 3028 | |
914adc42 | 3029 | XSETPVECTYPESIZE (v, tag, lisplen, memlen - lisplen); |
d2029e5b SM |
3030 | return v; |
3031 | } | |
d2029e5b | 3032 | |
36429c89 DA |
3033 | struct buffer * |
3034 | allocate_buffer (void) | |
3035 | { | |
38182d90 | 3036 | struct buffer *b = lisp_malloc (sizeof *b, MEM_TYPE_BUFFER); |
36429c89 | 3037 | |
914adc42 | 3038 | BUFFER_PVEC_INIT (b); |
c752cfa9 | 3039 | /* Put B on the chain of all buffers including killed ones. */ |
914adc42 | 3040 | b->next = all_buffers; |
c752cfa9 DA |
3041 | all_buffers = b; |
3042 | /* Note that the rest fields of B are not initialized. */ | |
36429c89 DA |
3043 | return b; |
3044 | } | |
3045 | ||
ece93c02 | 3046 | struct Lisp_Hash_Table * |
878f97ff | 3047 | allocate_hash_table (void) |
ece93c02 | 3048 | { |
878f97ff | 3049 | return ALLOCATE_PSEUDOVECTOR (struct Lisp_Hash_Table, count, PVEC_HASH_TABLE); |
ece93c02 GM |
3050 | } |
3051 | ||
ece93c02 | 3052 | struct window * |
971de7fb | 3053 | allocate_window (void) |
ece93c02 | 3054 | { |
62efea5e | 3055 | struct window *w; |
177c0ea7 | 3056 | |
62efea5e DA |
3057 | w = ALLOCATE_PSEUDOVECTOR (struct window, current_matrix, PVEC_WINDOW); |
3058 | /* Users assumes that non-Lisp data is zeroed. */ | |
3059 | memset (&w->current_matrix, 0, | |
3060 | sizeof (*w) - offsetof (struct window, current_matrix)); | |
3061 | return w; | |
3062 | } | |
177c0ea7 | 3063 | |
4a729fd8 | 3064 | struct terminal * |
971de7fb | 3065 | allocate_terminal (void) |
4a729fd8 | 3066 | { |
62efea5e | 3067 | struct terminal *t; |
ece93c02 | 3068 | |
62efea5e DA |
3069 | t = ALLOCATE_PSEUDOVECTOR (struct terminal, next_terminal, PVEC_TERMINAL); |
3070 | /* Users assumes that non-Lisp data is zeroed. */ | |
3071 | memset (&t->next_terminal, 0, | |
3072 | sizeof (*t) - offsetof (struct terminal, next_terminal)); | |
d2029e5b | 3073 | return t; |
4a729fd8 | 3074 | } |
ece93c02 GM |
3075 | |
3076 | struct frame * | |
971de7fb | 3077 | allocate_frame (void) |
ece93c02 | 3078 | { |
62efea5e DA |
3079 | struct frame *f; |
3080 | ||
3081 | f = ALLOCATE_PSEUDOVECTOR (struct frame, face_cache, PVEC_FRAME); | |
3082 | /* Users assumes that non-Lisp data is zeroed. */ | |
72af86bd | 3083 | memset (&f->face_cache, 0, |
62efea5e | 3084 | sizeof (*f) - offsetof (struct frame, face_cache)); |
d2029e5b | 3085 | return f; |
ece93c02 GM |
3086 | } |
3087 | ||
ece93c02 | 3088 | struct Lisp_Process * |
971de7fb | 3089 | allocate_process (void) |
ece93c02 | 3090 | { |
62efea5e | 3091 | struct Lisp_Process *p; |
ece93c02 | 3092 | |
62efea5e DA |
3093 | p = ALLOCATE_PSEUDOVECTOR (struct Lisp_Process, pid, PVEC_PROCESS); |
3094 | /* Users assumes that non-Lisp data is zeroed. */ | |
3095 | memset (&p->pid, 0, | |
3096 | sizeof (*p) - offsetof (struct Lisp_Process, pid)); | |
3097 | return p; | |
3098 | } | |
ece93c02 | 3099 | |
a7ca3326 | 3100 | DEFUN ("make-vector", Fmake_vector, Smake_vector, 2, 2, 0, |
a6266d23 | 3101 | doc: /* Return a newly created vector of length LENGTH, with each element being INIT. |
7ee72033 | 3102 | See also the function `vector'. */) |
5842a27b | 3103 | (register Lisp_Object length, Lisp_Object init) |
7146af97 | 3104 | { |
1825c68d | 3105 | Lisp_Object vector; |
d311d28c PE |
3106 | register ptrdiff_t sizei; |
3107 | register ptrdiff_t i; | |
7146af97 JB |
3108 | register struct Lisp_Vector *p; |
3109 | ||
b7826503 | 3110 | CHECK_NATNUM (length); |
7146af97 | 3111 | |
d311d28c PE |
3112 | p = allocate_vector (XFASTINT (length)); |
3113 | sizei = XFASTINT (length); | |
ae35e756 PE |
3114 | for (i = 0; i < sizei; i++) |
3115 | p->contents[i] = init; | |
7146af97 | 3116 | |
1825c68d | 3117 | XSETVECTOR (vector, p); |
7146af97 JB |
3118 | return vector; |
3119 | } | |
3120 | ||
34400008 | 3121 | |
a7ca3326 | 3122 | DEFUN ("vector", Fvector, Svector, 0, MANY, 0, |
eae936e2 | 3123 | doc: /* Return a newly created vector with specified arguments as elements. |
ae8e8122 MB |
3124 | Any number of arguments, even zero arguments, are allowed. |
3125 | usage: (vector &rest OBJECTS) */) | |
f66c7cf8 | 3126 | (ptrdiff_t nargs, Lisp_Object *args) |
7146af97 | 3127 | { |
f66c7cf8 | 3128 | ptrdiff_t i; |
25721f5b DA |
3129 | register Lisp_Object val = make_uninit_vector (nargs); |
3130 | register struct Lisp_Vector *p = XVECTOR (val); | |
7146af97 | 3131 | |
ae35e756 PE |
3132 | for (i = 0; i < nargs; i++) |
3133 | p->contents[i] = args[i]; | |
7146af97 JB |
3134 | return val; |
3135 | } | |
3136 | ||
3017f87f SM |
3137 | void |
3138 | make_byte_code (struct Lisp_Vector *v) | |
3139 | { | |
3140 | if (v->header.size > 1 && STRINGP (v->contents[1]) | |
3141 | && STRING_MULTIBYTE (v->contents[1])) | |
3142 | /* BYTECODE-STRING must have been produced by Emacs 20.2 or the | |
3143 | earlier because they produced a raw 8-bit string for byte-code | |
3144 | and now such a byte-code string is loaded as multibyte while | |
3145 | raw 8-bit characters converted to multibyte form. Thus, now we | |
3146 | must convert them back to the original unibyte form. */ | |
3147 | v->contents[1] = Fstring_as_unibyte (v->contents[1]); | |
3148 | XSETPVECTYPE (v, PVEC_COMPILED); | |
3149 | } | |
34400008 | 3150 | |
a7ca3326 | 3151 | DEFUN ("make-byte-code", Fmake_byte_code, Smake_byte_code, 4, MANY, 0, |
a6266d23 | 3152 | doc: /* Create a byte-code object with specified arguments as elements. |
e2abe5a1 SM |
3153 | The arguments should be the ARGLIST, bytecode-string BYTE-CODE, constant |
3154 | vector CONSTANTS, maximum stack size DEPTH, (optional) DOCSTRING, | |
3155 | and (optional) INTERACTIVE-SPEC. | |
228299fa | 3156 | The first four arguments are required; at most six have any |
ae8e8122 | 3157 | significance. |
e2abe5a1 SM |
3158 | The ARGLIST can be either like the one of `lambda', in which case the arguments |
3159 | will be dynamically bound before executing the byte code, or it can be an | |
3160 | integer of the form NNNNNNNRMMMMMMM where the 7bit MMMMMMM specifies the | |
3161 | minimum number of arguments, the 7-bit NNNNNNN specifies the maximum number | |
3162 | of arguments (ignoring &rest) and the R bit specifies whether there is a &rest | |
3163 | argument to catch the left-over arguments. If such an integer is used, the | |
3164 | arguments will not be dynamically bound but will be instead pushed on the | |
3165 | stack before executing the byte-code. | |
92cc28b2 | 3166 | usage: (make-byte-code ARGLIST BYTE-CODE CONSTANTS DEPTH &optional DOCSTRING INTERACTIVE-SPEC &rest ELEMENTS) */) |
f66c7cf8 | 3167 | (ptrdiff_t nargs, Lisp_Object *args) |
7146af97 | 3168 | { |
f66c7cf8 | 3169 | ptrdiff_t i; |
25721f5b DA |
3170 | register Lisp_Object val = make_uninit_vector (nargs); |
3171 | register struct Lisp_Vector *p = XVECTOR (val); | |
7146af97 | 3172 | |
12fbe755 | 3173 | /* We used to purecopy everything here, if purify-flag was set. This worked |
3017f87f SM |
3174 | OK for Emacs-23, but with Emacs-24's lexical binding code, it can be |
3175 | dangerous, since make-byte-code is used during execution to build | |
3176 | closures, so any closure built during the preload phase would end up | |
3177 | copied into pure space, including its free variables, which is sometimes | |
3178 | just wasteful and other times plainly wrong (e.g. those free vars may want | |
3179 | to be setcar'd). */ | |
9eac9d59 | 3180 | |
ae35e756 | 3181 | for (i = 0; i < nargs; i++) |
3017f87f SM |
3182 | p->contents[i] = args[i]; |
3183 | make_byte_code (p); | |
876c194c | 3184 | XSETCOMPILED (val, p); |
7146af97 JB |
3185 | return val; |
3186 | } | |
2e471eb5 | 3187 | |
34400008 | 3188 | |
7146af97 | 3189 | \f |
2e471eb5 GM |
3190 | /*********************************************************************** |
3191 | Symbol Allocation | |
3192 | ***********************************************************************/ | |
7146af97 | 3193 | |
d55c12ed AS |
3194 | /* Like struct Lisp_Symbol, but padded so that the size is a multiple |
3195 | of the required alignment if LSB tags are used. */ | |
3196 | ||
3197 | union aligned_Lisp_Symbol | |
3198 | { | |
3199 | struct Lisp_Symbol s; | |
bfe3e0a2 | 3200 | #if USE_LSB_TAG |
2b90362b DA |
3201 | unsigned char c[(sizeof (struct Lisp_Symbol) + GCALIGNMENT - 1) |
3202 | & -GCALIGNMENT]; | |
d55c12ed AS |
3203 | #endif |
3204 | }; | |
3205 | ||
2e471eb5 GM |
3206 | /* Each symbol_block is just under 1020 bytes long, since malloc |
3207 | really allocates in units of powers of two and uses 4 bytes for its | |
3017f87f | 3208 | own overhead. */ |
7146af97 JB |
3209 | |
3210 | #define SYMBOL_BLOCK_SIZE \ | |
d55c12ed | 3211 | ((1020 - sizeof (struct symbol_block *)) / sizeof (union aligned_Lisp_Symbol)) |
7146af97 JB |
3212 | |
3213 | struct symbol_block | |
2e471eb5 | 3214 | { |
6b61353c | 3215 | /* Place `symbols' first, to preserve alignment. */ |
d55c12ed | 3216 | union aligned_Lisp_Symbol symbols[SYMBOL_BLOCK_SIZE]; |
6b61353c | 3217 | struct symbol_block *next; |
2e471eb5 | 3218 | }; |
7146af97 | 3219 | |
34400008 GM |
3220 | /* Current symbol block and index of first unused Lisp_Symbol |
3221 | structure in it. */ | |
3222 | ||
d3d47262 | 3223 | static struct symbol_block *symbol_block; |
fff62aa9 | 3224 | static int symbol_block_index = SYMBOL_BLOCK_SIZE; |
7146af97 | 3225 | |
34400008 GM |
3226 | /* List of free symbols. */ |
3227 | ||
d3d47262 | 3228 | static struct Lisp_Symbol *symbol_free_list; |
7146af97 | 3229 | |
84575e67 PE |
3230 | static void |
3231 | set_symbol_name (Lisp_Object sym, Lisp_Object name) | |
3232 | { | |
3233 | XSYMBOL (sym)->name = name; | |
3234 | } | |
3235 | ||
a7ca3326 | 3236 | DEFUN ("make-symbol", Fmake_symbol, Smake_symbol, 1, 1, 0, |
a6266d23 | 3237 | doc: /* Return a newly allocated uninterned symbol whose name is NAME. |
eadf1faa | 3238 | Its value is void, and its function definition and property list are nil. */) |
5842a27b | 3239 | (Lisp_Object name) |
7146af97 JB |
3240 | { |
3241 | register Lisp_Object val; | |
3242 | register struct Lisp_Symbol *p; | |
3243 | ||
b7826503 | 3244 | CHECK_STRING (name); |
7146af97 | 3245 | |
dafc79fa | 3246 | MALLOC_BLOCK_INPUT; |
e2984df0 | 3247 | |
7146af97 JB |
3248 | if (symbol_free_list) |
3249 | { | |
45d12a89 | 3250 | XSETSYMBOL (val, symbol_free_list); |
28a099a4 | 3251 | symbol_free_list = symbol_free_list->next; |
7146af97 JB |
3252 | } |
3253 | else | |
3254 | { | |
3255 | if (symbol_block_index == SYMBOL_BLOCK_SIZE) | |
3256 | { | |
38182d90 PE |
3257 | struct symbol_block *new |
3258 | = lisp_malloc (sizeof *new, MEM_TYPE_SYMBOL); | |
7146af97 JB |
3259 | new->next = symbol_block; |
3260 | symbol_block = new; | |
3261 | symbol_block_index = 0; | |
3900d5de | 3262 | total_free_symbols += SYMBOL_BLOCK_SIZE; |
7146af97 | 3263 | } |
d55c12ed | 3264 | XSETSYMBOL (val, &symbol_block->symbols[symbol_block_index].s); |
6b61353c | 3265 | symbol_block_index++; |
7146af97 | 3266 | } |
177c0ea7 | 3267 | |
dafc79fa | 3268 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 3269 | |
7146af97 | 3270 | p = XSYMBOL (val); |
c644523b DA |
3271 | set_symbol_name (val, name); |
3272 | set_symbol_plist (val, Qnil); | |
ce5b453a SM |
3273 | p->redirect = SYMBOL_PLAINVAL; |
3274 | SET_SYMBOL_VAL (p, Qunbound); | |
eadf1faa | 3275 | set_symbol_function (val, Qnil); |
c644523b | 3276 | set_symbol_next (val, NULL); |
2336fe58 | 3277 | p->gcmarkbit = 0; |
9e713715 GM |
3278 | p->interned = SYMBOL_UNINTERNED; |
3279 | p->constant = 0; | |
b9598260 | 3280 | p->declared_special = 0; |
2e471eb5 GM |
3281 | consing_since_gc += sizeof (struct Lisp_Symbol); |
3282 | symbols_consed++; | |
3900d5de | 3283 | total_free_symbols--; |
7146af97 JB |
3284 | return val; |
3285 | } | |
3286 | ||
3f25e183 | 3287 | |
2e471eb5 GM |
3288 | \f |
3289 | /*********************************************************************** | |
34400008 | 3290 | Marker (Misc) Allocation |
2e471eb5 | 3291 | ***********************************************************************/ |
3f25e183 | 3292 | |
d55c12ed AS |
3293 | /* Like union Lisp_Misc, but padded so that its size is a multiple of |
3294 | the required alignment when LSB tags are used. */ | |
3295 | ||
3296 | union aligned_Lisp_Misc | |
3297 | { | |
3298 | union Lisp_Misc m; | |
bfe3e0a2 | 3299 | #if USE_LSB_TAG |
2b90362b DA |
3300 | unsigned char c[(sizeof (union Lisp_Misc) + GCALIGNMENT - 1) |
3301 | & -GCALIGNMENT]; | |
d55c12ed AS |
3302 | #endif |
3303 | }; | |
3304 | ||
2e471eb5 GM |
3305 | /* Allocation of markers and other objects that share that structure. |
3306 | Works like allocation of conses. */ | |
c0696668 | 3307 | |
2e471eb5 | 3308 | #define MARKER_BLOCK_SIZE \ |
d55c12ed | 3309 | ((1020 - sizeof (struct marker_block *)) / sizeof (union aligned_Lisp_Misc)) |
2e471eb5 GM |
3310 | |
3311 | struct marker_block | |
c0696668 | 3312 | { |
6b61353c | 3313 | /* Place `markers' first, to preserve alignment. */ |
d55c12ed | 3314 | union aligned_Lisp_Misc markers[MARKER_BLOCK_SIZE]; |
6b61353c | 3315 | struct marker_block *next; |
2e471eb5 | 3316 | }; |
c0696668 | 3317 | |
d3d47262 | 3318 | static struct marker_block *marker_block; |
fff62aa9 | 3319 | static int marker_block_index = MARKER_BLOCK_SIZE; |
c0696668 | 3320 | |
d3d47262 | 3321 | static union Lisp_Misc *marker_free_list; |
c0696668 | 3322 | |
d7a7fda3 | 3323 | /* Return a newly allocated Lisp_Misc object of specified TYPE. */ |
2e471eb5 | 3324 | |
1b971ac1 | 3325 | static Lisp_Object |
d7a7fda3 | 3326 | allocate_misc (enum Lisp_Misc_Type type) |
7146af97 | 3327 | { |
2e471eb5 | 3328 | Lisp_Object val; |
7146af97 | 3329 | |
dafc79fa | 3330 | MALLOC_BLOCK_INPUT; |
cfb2f32e | 3331 | |
2e471eb5 | 3332 | if (marker_free_list) |
7146af97 | 3333 | { |
2e471eb5 GM |
3334 | XSETMISC (val, marker_free_list); |
3335 | marker_free_list = marker_free_list->u_free.chain; | |
7146af97 JB |
3336 | } |
3337 | else | |
7146af97 | 3338 | { |
2e471eb5 GM |
3339 | if (marker_block_index == MARKER_BLOCK_SIZE) |
3340 | { | |
38182d90 | 3341 | struct marker_block *new = lisp_malloc (sizeof *new, MEM_TYPE_MISC); |
2e471eb5 GM |
3342 | new->next = marker_block; |
3343 | marker_block = new; | |
3344 | marker_block_index = 0; | |
7b7990cc | 3345 | total_free_markers += MARKER_BLOCK_SIZE; |
2e471eb5 | 3346 | } |
d55c12ed | 3347 | XSETMISC (val, &marker_block->markers[marker_block_index].m); |
6b61353c | 3348 | marker_block_index++; |
7146af97 | 3349 | } |
177c0ea7 | 3350 | |
dafc79fa | 3351 | MALLOC_UNBLOCK_INPUT; |
e2984df0 | 3352 | |
7b7990cc | 3353 | --total_free_markers; |
2e471eb5 GM |
3354 | consing_since_gc += sizeof (union Lisp_Misc); |
3355 | misc_objects_consed++; | |
84575e67 | 3356 | XMISCANY (val)->type = type; |
67ee9f6e | 3357 | XMISCANY (val)->gcmarkbit = 0; |
2e471eb5 GM |
3358 | return val; |
3359 | } | |
3360 | ||
73ebd38f | 3361 | /* Free a Lisp_Misc object. */ |
7b7990cc | 3362 | |
73ebd38f | 3363 | void |
971de7fb | 3364 | free_misc (Lisp_Object misc) |
7b7990cc | 3365 | { |
84575e67 | 3366 | XMISCANY (misc)->type = Lisp_Misc_Free; |
7b7990cc KS |
3367 | XMISC (misc)->u_free.chain = marker_free_list; |
3368 | marker_free_list = XMISC (misc); | |
0dd6d66d | 3369 | consing_since_gc -= sizeof (union Lisp_Misc); |
7b7990cc KS |
3370 | total_free_markers++; |
3371 | } | |
3372 | ||
7b1123d8 PE |
3373 | /* Verify properties of Lisp_Save_Value's representation |
3374 | that are assumed here and elsewhere. */ | |
3375 | ||
3376 | verify (SAVE_UNUSED == 0); | |
52a9bcae PE |
3377 | verify (((SAVE_INTEGER | SAVE_POINTER | SAVE_FUNCPOINTER | SAVE_OBJECT) |
3378 | >> SAVE_SLOT_BITS) | |
3379 | == 0); | |
7b1123d8 | 3380 | |
1396ac86 PE |
3381 | /* Return Lisp_Save_Value objects for the various combinations |
3382 | that callers need. */ | |
1b971ac1 DA |
3383 | |
3384 | Lisp_Object | |
1396ac86 | 3385 | make_save_int_int_int (ptrdiff_t a, ptrdiff_t b, ptrdiff_t c) |
1b971ac1 | 3386 | { |
1b971ac1 DA |
3387 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); |
3388 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
1396ac86 PE |
3389 | p->save_type = SAVE_TYPE_INT_INT_INT; |
3390 | p->data[0].integer = a; | |
3391 | p->data[1].integer = b; | |
3392 | p->data[2].integer = c; | |
3393 | return val; | |
3394 | } | |
1b971ac1 | 3395 | |
1396ac86 PE |
3396 | Lisp_Object |
3397 | make_save_obj_obj_obj_obj (Lisp_Object a, Lisp_Object b, Lisp_Object c, | |
3398 | Lisp_Object d) | |
3399 | { | |
3400 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); | |
3401 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
3402 | p->save_type = SAVE_TYPE_OBJ_OBJ_OBJ_OBJ; | |
3403 | p->data[0].object = a; | |
3404 | p->data[1].object = b; | |
3405 | p->data[2].object = c; | |
3406 | p->data[3].object = d; | |
3407 | return val; | |
3408 | } | |
1b971ac1 | 3409 | |
198fa217 | 3410 | #if defined HAVE_NS || defined HAVE_NTGUI |
1396ac86 PE |
3411 | Lisp_Object |
3412 | make_save_ptr (void *a) | |
3413 | { | |
3414 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); | |
3415 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
3416 | p->save_type = SAVE_POINTER; | |
3417 | p->data[0].pointer = a; | |
3418 | return val; | |
3419 | } | |
3420 | #endif | |
7b1123d8 | 3421 | |
1396ac86 PE |
3422 | Lisp_Object |
3423 | make_save_ptr_int (void *a, ptrdiff_t b) | |
3424 | { | |
3425 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); | |
3426 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
3427 | p->save_type = SAVE_TYPE_PTR_INT; | |
3428 | p->data[0].pointer = a; | |
3429 | p->data[1].integer = b; | |
3430 | return val; | |
3431 | } | |
1b971ac1 | 3432 | |
f4e891b5 PE |
3433 | #if defined HAVE_MENUS && ! (defined USE_X_TOOLKIT || defined USE_GTK) |
3434 | Lisp_Object | |
3435 | make_save_ptr_ptr (void *a, void *b) | |
3436 | { | |
3437 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); | |
3438 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
3439 | p->save_type = SAVE_TYPE_PTR_PTR; | |
3440 | p->data[0].pointer = a; | |
3441 | p->data[1].pointer = b; | |
3442 | return val; | |
3443 | } | |
3444 | #endif | |
3445 | ||
1396ac86 PE |
3446 | Lisp_Object |
3447 | make_save_funcptr_ptr_obj (void (*a) (void), void *b, Lisp_Object c) | |
3448 | { | |
3449 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); | |
3450 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
3451 | p->save_type = SAVE_TYPE_FUNCPTR_PTR_OBJ; | |
3452 | p->data[0].funcpointer = a; | |
3453 | p->data[1].pointer = b; | |
3454 | p->data[2].object = c; | |
1b971ac1 DA |
3455 | return val; |
3456 | } | |
3457 | ||
1396ac86 PE |
3458 | /* Return a Lisp_Save_Value object that represents an array A |
3459 | of N Lisp objects. */ | |
42172a6b RS |
3460 | |
3461 | Lisp_Object | |
1396ac86 | 3462 | make_save_memory (Lisp_Object *a, ptrdiff_t n) |
42172a6b | 3463 | { |
468afbac DA |
3464 | Lisp_Object val = allocate_misc (Lisp_Misc_Save_Value); |
3465 | struct Lisp_Save_Value *p = XSAVE_VALUE (val); | |
1396ac86 PE |
3466 | p->save_type = SAVE_TYPE_MEMORY; |
3467 | p->data[0].pointer = a; | |
3468 | p->data[1].integer = n; | |
468afbac | 3469 | return val; |
42172a6b RS |
3470 | } |
3471 | ||
73ebd38f DA |
3472 | /* Free a Lisp_Save_Value object. Do not use this function |
3473 | if SAVE contains pointer other than returned by xmalloc. */ | |
62c2e5ed | 3474 | |
27e498e6 | 3475 | void |
62c2e5ed DA |
3476 | free_save_value (Lisp_Object save) |
3477 | { | |
2b30549c | 3478 | xfree (XSAVE_POINTER (save, 0)); |
62c2e5ed DA |
3479 | free_misc (save); |
3480 | } | |
3481 | ||
d7a7fda3 DA |
3482 | /* Return a Lisp_Misc_Overlay object with specified START, END and PLIST. */ |
3483 | ||
3484 | Lisp_Object | |
3485 | build_overlay (Lisp_Object start, Lisp_Object end, Lisp_Object plist) | |
3486 | { | |
3487 | register Lisp_Object overlay; | |
3488 | ||
3489 | overlay = allocate_misc (Lisp_Misc_Overlay); | |
3490 | OVERLAY_START (overlay) = start; | |
3491 | OVERLAY_END (overlay) = end; | |
c644523b | 3492 | set_overlay_plist (overlay, plist); |
d7a7fda3 DA |
3493 | XOVERLAY (overlay)->next = NULL; |
3494 | return overlay; | |
3495 | } | |
3496 | ||
a7ca3326 | 3497 | DEFUN ("make-marker", Fmake_marker, Smake_marker, 0, 0, 0, |
a6266d23 | 3498 | doc: /* Return a newly allocated marker which does not point at any place. */) |
5842a27b | 3499 | (void) |
2e471eb5 | 3500 | { |
eeaea515 DA |
3501 | register Lisp_Object val; |
3502 | register struct Lisp_Marker *p; | |
7146af97 | 3503 | |
eeaea515 DA |
3504 | val = allocate_misc (Lisp_Misc_Marker); |
3505 | p = XMARKER (val); | |
3506 | p->buffer = 0; | |
3507 | p->bytepos = 0; | |
3508 | p->charpos = 0; | |
3509 | p->next = NULL; | |
3510 | p->insertion_type = 0; | |
101ed2bb | 3511 | p->need_adjustment = 0; |
eeaea515 | 3512 | return val; |
7146af97 | 3513 | } |
2e471eb5 | 3514 | |
657924ff DA |
3515 | /* Return a newly allocated marker which points into BUF |
3516 | at character position CHARPOS and byte position BYTEPOS. */ | |
3517 | ||
3518 | Lisp_Object | |
3519 | build_marker (struct buffer *buf, ptrdiff_t charpos, ptrdiff_t bytepos) | |
3520 | { | |
eeaea515 DA |
3521 | Lisp_Object obj; |
3522 | struct Lisp_Marker *m; | |
657924ff DA |
3523 | |
3524 | /* No dead buffers here. */ | |
e578f381 | 3525 | eassert (BUFFER_LIVE_P (buf)); |
657924ff | 3526 | |
eeaea515 DA |
3527 | /* Every character is at least one byte. */ |
3528 | eassert (charpos <= bytepos); | |
3529 | ||
3530 | obj = allocate_misc (Lisp_Misc_Marker); | |
3531 | m = XMARKER (obj); | |
3532 | m->buffer = buf; | |
3533 | m->charpos = charpos; | |
3534 | m->bytepos = bytepos; | |
3535 | m->insertion_type = 0; | |
101ed2bb | 3536 | m->need_adjustment = 0; |
eeaea515 DA |
3537 | m->next = BUF_MARKERS (buf); |
3538 | BUF_MARKERS (buf) = m; | |
3539 | return obj; | |
657924ff DA |
3540 | } |
3541 | ||
2e471eb5 GM |
3542 | /* Put MARKER back on the free list after using it temporarily. */ |
3543 | ||
3544 | void | |
971de7fb | 3545 | free_marker (Lisp_Object marker) |
2e471eb5 | 3546 | { |
ef89c2ce | 3547 | unchain_marker (XMARKER (marker)); |
7b7990cc | 3548 | free_misc (marker); |
2e471eb5 GM |
3549 | } |
3550 | ||
c0696668 | 3551 | \f |
7146af97 | 3552 | /* Return a newly created vector or string with specified arguments as |
736471d1 RS |
3553 | elements. If all the arguments are characters that can fit |
3554 | in a string of events, make a string; otherwise, make a vector. | |
3555 | ||
3556 | Any number of arguments, even zero arguments, are allowed. */ | |
7146af97 JB |
3557 | |
3558 | Lisp_Object | |
0c90b9ee | 3559 | make_event_array (ptrdiff_t nargs, Lisp_Object *args) |
7146af97 | 3560 | { |
0c90b9ee | 3561 | ptrdiff_t i; |
7146af97 JB |
3562 | |
3563 | for (i = 0; i < nargs; i++) | |
736471d1 | 3564 | /* The things that fit in a string |
c9ca4659 RS |
3565 | are characters that are in 0...127, |
3566 | after discarding the meta bit and all the bits above it. */ | |
e687453f | 3567 | if (!INTEGERP (args[i]) |
c11285dc | 3568 | || (XINT (args[i]) & ~(-CHAR_META)) >= 0200) |
7146af97 JB |
3569 | return Fvector (nargs, args); |
3570 | ||
3571 | /* Since the loop exited, we know that all the things in it are | |
3572 | characters, so we can make a string. */ | |
3573 | { | |
c13ccad2 | 3574 | Lisp_Object result; |
177c0ea7 | 3575 | |
50aee051 | 3576 | result = Fmake_string (make_number (nargs), make_number (0)); |
7146af97 | 3577 | for (i = 0; i < nargs; i++) |
736471d1 | 3578 | { |
46e7e6b0 | 3579 | SSET (result, i, XINT (args[i])); |
736471d1 RS |
3580 | /* Move the meta bit to the right place for a string char. */ |
3581 | if (XINT (args[i]) & CHAR_META) | |
46e7e6b0 | 3582 | SSET (result, i, SREF (result, i) | 0x80); |
736471d1 | 3583 | } |
177c0ea7 | 3584 | |
7146af97 JB |
3585 | return result; |
3586 | } | |
3587 | } | |
2e471eb5 GM |
3588 | |
3589 | ||
7146af97 | 3590 | \f |
24d8a105 RS |
3591 | /************************************************************************ |
3592 | Memory Full Handling | |
3593 | ************************************************************************/ | |
3594 | ||
3595 | ||
531b0165 PE |
3596 | /* Called if malloc (NBYTES) returns zero. If NBYTES == SIZE_MAX, |
3597 | there may have been size_t overflow so that malloc was never | |
3598 | called, or perhaps malloc was invoked successfully but the | |
3599 | resulting pointer had problems fitting into a tagged EMACS_INT. In | |
3600 | either case this counts as memory being full even though malloc did | |
3601 | not fail. */ | |
24d8a105 RS |
3602 | |
3603 | void | |
531b0165 | 3604 | memory_full (size_t nbytes) |
24d8a105 | 3605 | { |
531b0165 | 3606 | /* Do not go into hysterics merely because a large request failed. */ |
fce31d69 | 3607 | bool enough_free_memory = 0; |
2b6148e4 | 3608 | if (SPARE_MEMORY < nbytes) |
531b0165 | 3609 | { |
66606eea PE |
3610 | void *p; |
3611 | ||
3612 | MALLOC_BLOCK_INPUT; | |
3613 | p = malloc (SPARE_MEMORY); | |
531b0165 PE |
3614 | if (p) |
3615 | { | |
4d09bcf6 | 3616 | free (p); |
531b0165 PE |
3617 | enough_free_memory = 1; |
3618 | } | |
66606eea | 3619 | MALLOC_UNBLOCK_INPUT; |
531b0165 | 3620 | } |
24d8a105 | 3621 | |
531b0165 PE |
3622 | if (! enough_free_memory) |
3623 | { | |
3624 | int i; | |
24d8a105 | 3625 | |
531b0165 PE |
3626 | Vmemory_full = Qt; |
3627 | ||
3628 | memory_full_cons_threshold = sizeof (struct cons_block); | |
3629 | ||
3630 | /* The first time we get here, free the spare memory. */ | |
3631 | for (i = 0; i < sizeof (spare_memory) / sizeof (char *); i++) | |
3632 | if (spare_memory[i]) | |
3633 | { | |
3634 | if (i == 0) | |
3635 | free (spare_memory[i]); | |
3636 | else if (i >= 1 && i <= 4) | |
3637 | lisp_align_free (spare_memory[i]); | |
3638 | else | |
3639 | lisp_free (spare_memory[i]); | |
3640 | spare_memory[i] = 0; | |
3641 | } | |
531b0165 | 3642 | } |
24d8a105 RS |
3643 | |
3644 | /* This used to call error, but if we've run out of memory, we could | |
3645 | get infinite recursion trying to build the string. */ | |
9b306d37 | 3646 | xsignal (Qnil, Vmemory_signal_data); |
24d8a105 RS |
3647 | } |
3648 | ||
3649 | /* If we released our reserve (due to running out of memory), | |
3650 | and we have a fair amount free once again, | |
3651 | try to set aside another reserve in case we run out once more. | |
3652 | ||
3653 | This is called when a relocatable block is freed in ralloc.c, | |
3654 | and also directly from this file, in case we're not using ralloc.c. */ | |
3655 | ||
3656 | void | |
971de7fb | 3657 | refill_memory_reserve (void) |
24d8a105 RS |
3658 | { |
3659 | #ifndef SYSTEM_MALLOC | |
3660 | if (spare_memory[0] == 0) | |
38182d90 | 3661 | spare_memory[0] = malloc (SPARE_MEMORY); |
24d8a105 | 3662 | if (spare_memory[1] == 0) |
38182d90 | 3663 | spare_memory[1] = lisp_align_malloc (sizeof (struct cons_block), |
35aaa1ea | 3664 | MEM_TYPE_SPARE); |
24d8a105 | 3665 | if (spare_memory[2] == 0) |
38182d90 | 3666 | spare_memory[2] = lisp_align_malloc (sizeof (struct cons_block), |
35aaa1ea | 3667 | MEM_TYPE_SPARE); |
24d8a105 | 3668 | if (spare_memory[3] == 0) |
38182d90 | 3669 | spare_memory[3] = lisp_align_malloc (sizeof (struct cons_block), |
35aaa1ea | 3670 | MEM_TYPE_SPARE); |
24d8a105 | 3671 | if (spare_memory[4] == 0) |
38182d90 | 3672 | spare_memory[4] = lisp_align_malloc (sizeof (struct cons_block), |
35aaa1ea | 3673 | MEM_TYPE_SPARE); |
24d8a105 | 3674 | if (spare_memory[5] == 0) |
38182d90 | 3675 | spare_memory[5] = lisp_malloc (sizeof (struct string_block), |
35aaa1ea | 3676 | MEM_TYPE_SPARE); |
24d8a105 | 3677 | if (spare_memory[6] == 0) |
38182d90 | 3678 | spare_memory[6] = lisp_malloc (sizeof (struct string_block), |
35aaa1ea | 3679 | MEM_TYPE_SPARE); |
24d8a105 RS |
3680 | if (spare_memory[0] && spare_memory[1] && spare_memory[5]) |
3681 | Vmemory_full = Qnil; | |
3682 | #endif | |
3683 | } | |
3684 | \f | |
34400008 GM |
3685 | /************************************************************************ |
3686 | C Stack Marking | |
3687 | ************************************************************************/ | |
3688 | ||
13c844fb GM |
3689 | #if GC_MARK_STACK || defined GC_MALLOC_CHECK |
3690 | ||
71cf5fa0 GM |
3691 | /* Conservative C stack marking requires a method to identify possibly |
3692 | live Lisp objects given a pointer value. We do this by keeping | |
3693 | track of blocks of Lisp data that are allocated in a red-black tree | |
3694 | (see also the comment of mem_node which is the type of nodes in | |
3695 | that tree). Function lisp_malloc adds information for an allocated | |
3696 | block to the red-black tree with calls to mem_insert, and function | |
3697 | lisp_free removes it with mem_delete. Functions live_string_p etc | |
3698 | call mem_find to lookup information about a given pointer in the | |
3699 | tree, and use that to determine if the pointer points to a Lisp | |
3700 | object or not. */ | |
3701 | ||
34400008 GM |
3702 | /* Initialize this part of alloc.c. */ |
3703 | ||
3704 | static void | |
971de7fb | 3705 | mem_init (void) |
34400008 GM |
3706 | { |
3707 | mem_z.left = mem_z.right = MEM_NIL; | |
3708 | mem_z.parent = NULL; | |
3709 | mem_z.color = MEM_BLACK; | |
3710 | mem_z.start = mem_z.end = NULL; | |
3711 | mem_root = MEM_NIL; | |
3712 | } | |
3713 | ||
3714 | ||
3715 | /* Value is a pointer to the mem_node containing START. Value is | |
3716 | MEM_NIL if there is no node in the tree containing START. */ | |
3717 | ||
b0ab8123 | 3718 | static struct mem_node * |
971de7fb | 3719 | mem_find (void *start) |
34400008 GM |
3720 | { |
3721 | struct mem_node *p; | |
3722 | ||
ece93c02 GM |
3723 | if (start < min_heap_address || start > max_heap_address) |
3724 | return MEM_NIL; | |
3725 | ||
34400008 GM |
3726 | /* Make the search always successful to speed up the loop below. */ |
3727 | mem_z.start = start; | |
3728 | mem_z.end = (char *) start + 1; | |
3729 | ||
3730 | p = mem_root; | |
3731 | while (start < p->start || start >= p->end) | |
3732 | p = start < p->start ? p->left : p->right; | |
3733 | return p; | |
3734 | } | |
3735 | ||
3736 | ||
3737 | /* Insert a new node into the tree for a block of memory with start | |
3738 | address START, end address END, and type TYPE. Value is a | |
3739 | pointer to the node that was inserted. */ | |
3740 | ||
3741 | static struct mem_node * | |
971de7fb | 3742 | mem_insert (void *start, void *end, enum mem_type type) |
34400008 GM |
3743 | { |
3744 | struct mem_node *c, *parent, *x; | |
3745 | ||
add3c3ea | 3746 | if (min_heap_address == NULL || start < min_heap_address) |
ece93c02 | 3747 | min_heap_address = start; |
add3c3ea | 3748 | if (max_heap_address == NULL || end > max_heap_address) |
ece93c02 GM |
3749 | max_heap_address = end; |
3750 | ||
34400008 GM |
3751 | /* See where in the tree a node for START belongs. In this |
3752 | particular application, it shouldn't happen that a node is already | |
3753 | present. For debugging purposes, let's check that. */ | |
3754 | c = mem_root; | |
3755 | parent = NULL; | |
3756 | ||
3757 | #if GC_MARK_STACK != GC_MAKE_GCPROS_NOOPS | |
177c0ea7 | 3758 | |
34400008 GM |
3759 | while (c != MEM_NIL) |
3760 | { | |
3761 | if (start >= c->start && start < c->end) | |
1088b922 | 3762 | emacs_abort (); |
34400008 GM |
3763 | parent = c; |
3764 | c = start < c->start ? c->left : c->right; | |
3765 | } | |
177c0ea7 | 3766 | |
34400008 | 3767 | #else /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */ |
177c0ea7 | 3768 | |
34400008 GM |
3769 | while (c != MEM_NIL) |
3770 | { | |
3771 | parent = c; | |
3772 | c = start < c->start ? c->left : c->right; | |
3773 | } | |
177c0ea7 | 3774 | |
34400008 GM |
3775 | #endif /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */ |
3776 | ||
3777 | /* Create a new node. */ | |
877935b1 | 3778 | #ifdef GC_MALLOC_CHECK |
0caaedb1 | 3779 | x = malloc (sizeof *x); |
877935b1 | 3780 | if (x == NULL) |
1088b922 | 3781 | emacs_abort (); |
877935b1 | 3782 | #else |
23f86fce | 3783 | x = xmalloc (sizeof *x); |
877935b1 | 3784 | #endif |
34400008 GM |
3785 | x->start = start; |
3786 | x->end = end; | |
3787 | x->type = type; | |
3788 | x->parent = parent; | |
3789 | x->left = x->right = MEM_NIL; | |
3790 | x->color = MEM_RED; | |
3791 | ||
3792 | /* Insert it as child of PARENT or install it as root. */ | |
3793 | if (parent) | |
3794 | { | |
3795 | if (start < parent->start) | |
3796 | parent->left = x; | |
3797 | else | |
3798 | parent->right = x; | |
3799 | } | |
177c0ea7 | 3800 | else |
34400008 GM |
3801 | mem_root = x; |
3802 | ||
3803 | /* Re-establish red-black tree properties. */ | |
3804 | mem_insert_fixup (x); | |
877935b1 | 3805 | |
34400008 GM |
3806 | return x; |
3807 | } | |
3808 | ||
3809 | ||
3810 | /* Re-establish the red-black properties of the tree, and thereby | |
3811 | balance the tree, after node X has been inserted; X is always red. */ | |
3812 | ||
3813 | static void | |
971de7fb | 3814 | mem_insert_fixup (struct mem_node *x) |
34400008 GM |
3815 | { |
3816 | while (x != mem_root && x->parent->color == MEM_RED) | |
3817 | { | |
3818 | /* X is red and its parent is red. This is a violation of | |
3819 | red-black tree property #3. */ | |
177c0ea7 | 3820 | |
34400008 GM |
3821 | if (x->parent == x->parent->parent->left) |
3822 | { | |
3823 | /* We're on the left side of our grandparent, and Y is our | |
3824 | "uncle". */ | |
3825 | struct mem_node *y = x->parent->parent->right; | |
177c0ea7 | 3826 | |
34400008 GM |
3827 | if (y->color == MEM_RED) |
3828 | { | |
3829 | /* Uncle and parent are red but should be black because | |
3830 | X is red. Change the colors accordingly and proceed | |
3831 | with the grandparent. */ | |
3832 | x->parent->color = MEM_BLACK; | |
3833 | y->color = MEM_BLACK; | |
3834 | x->parent->parent->color = MEM_RED; | |
3835 | x = x->parent->parent; | |
3836 | } | |
3837 | else | |
3838 | { | |
3839 | /* Parent and uncle have different colors; parent is | |
3840 | red, uncle is black. */ | |
3841 | if (x == x->parent->right) | |
3842 | { | |
3843 | x = x->parent; | |
3844 | mem_rotate_left (x); | |
3845 | } | |
3846 | ||
3847 | x->parent->color = MEM_BLACK; | |
3848 | x->parent->parent->color = MEM_RED; | |
3849 | mem_rotate_right (x->parent->parent); | |
3850 | } | |
3851 | } | |
3852 | else | |
3853 | { | |
3854 | /* This is the symmetrical case of above. */ | |
3855 | struct mem_node *y = x->parent->parent->left; | |
177c0ea7 | 3856 | |
34400008 GM |
3857 | if (y->color == MEM_RED) |
3858 | { | |
3859 | x->parent->color = MEM_BLACK; | |
3860 | y->color = MEM_BLACK; | |
3861 | x->parent->parent->color = MEM_RED; | |
3862 | x = x->parent->parent; | |
3863 | } | |
3864 | else | |
3865 | { | |
3866 | if (x == x->parent->left) | |
3867 | { | |
3868 | x = x->parent; | |
3869 | mem_rotate_right (x); | |
3870 | } | |
177c0ea7 | 3871 | |
34400008 GM |
3872 | x->parent->color = MEM_BLACK; |
3873 | x->parent->parent->color = MEM_RED; | |
3874 | mem_rotate_left (x->parent->parent); | |
3875 | } | |
3876 | } | |
3877 | } | |
3878 | ||
3879 | /* The root may have been changed to red due to the algorithm. Set | |
3880 | it to black so that property #5 is satisfied. */ | |
3881 | mem_root->color = MEM_BLACK; | |
3882 | } | |
3883 | ||
3884 | ||
177c0ea7 JB |
3885 | /* (x) (y) |
3886 | / \ / \ | |
34400008 GM |
3887 | a (y) ===> (x) c |
3888 | / \ / \ | |
3889 | b c a b */ | |
3890 | ||
3891 | static void | |
971de7fb | 3892 | mem_rotate_left (struct mem_node *x) |
34400008 GM |
3893 | { |
3894 | struct mem_node *y; | |
3895 | ||
3896 | /* Turn y's left sub-tree into x's right sub-tree. */ | |
3897 | y = x->right; | |
3898 | x->right = y->left; | |
3899 | if (y->left != MEM_NIL) | |
3900 | y->left->parent = x; | |
3901 | ||
3902 | /* Y's parent was x's parent. */ | |
3903 | if (y != MEM_NIL) | |
3904 | y->parent = x->parent; | |
3905 | ||
3906 | /* Get the parent to point to y instead of x. */ | |
3907 | if (x->parent) | |
3908 | { | |
3909 | if (x == x->parent->left) | |
3910 | x->parent->left = y; | |
3911 | else | |
3912 | x->parent->right = y; | |
3913 | } | |
3914 | else | |
3915 | mem_root = y; | |
3916 | ||
3917 | /* Put x on y's left. */ | |
3918 | y->left = x; | |
3919 | if (x != MEM_NIL) | |
3920 | x->parent = y; | |
3921 | } | |
3922 | ||
3923 | ||
177c0ea7 JB |
3924 | /* (x) (Y) |
3925 | / \ / \ | |
3926 | (y) c ===> a (x) | |
3927 | / \ / \ | |
34400008 GM |
3928 | a b b c */ |
3929 | ||
3930 | static void | |
971de7fb | 3931 | mem_rotate_right (struct mem_node *x) |
34400008 GM |
3932 | { |
3933 | struct mem_node *y = x->left; | |
3934 | ||
3935 | x->left = y->right; | |
3936 | if (y->right != MEM_NIL) | |
3937 | y->right->parent = x; | |
177c0ea7 | 3938 | |
34400008 GM |
3939 | if (y != MEM_NIL) |
3940 | y->parent = x->parent; | |
3941 | if (x->parent) | |
3942 | { | |
3943 | if (x == x->parent->right) | |
3944 | x->parent->right = y; | |
3945 | else | |
3946 | x->parent->left = y; | |
3947 | } | |
3948 | else | |
3949 | mem_root = y; | |
177c0ea7 | 3950 | |
34400008 GM |
3951 | y->right = x; |
3952 | if (x != MEM_NIL) | |
3953 | x->parent = y; | |
3954 | } | |
3955 | ||
3956 | ||
3957 | /* Delete node Z from the tree. If Z is null or MEM_NIL, do nothing. */ | |
3958 | ||
3959 | static void | |
971de7fb | 3960 | mem_delete (struct mem_node *z) |
34400008 GM |
3961 | { |
3962 | struct mem_node *x, *y; | |
3963 | ||
3964 | if (!z || z == MEM_NIL) | |
3965 | return; | |
3966 | ||
3967 | if (z->left == MEM_NIL || z->right == MEM_NIL) | |
3968 | y = z; | |
3969 | else | |
3970 | { | |
3971 | y = z->right; | |
3972 | while (y->left != MEM_NIL) | |
3973 | y = y->left; | |
3974 | } | |
3975 | ||
3976 | if (y->left != MEM_NIL) | |
3977 | x = y->left; | |
3978 | else | |
3979 | x = y->right; | |
3980 | ||
3981 | x->parent = y->parent; | |
3982 | if (y->parent) | |
3983 | { | |
3984 | if (y == y->parent->left) | |
3985 | y->parent->left = x; | |
3986 | else | |
3987 | y->parent->right = x; | |
3988 | } | |
3989 | else | |
3990 | mem_root = x; | |
3991 | ||
3992 | if (y != z) | |
3993 | { | |
3994 | z->start = y->start; | |
3995 | z->end = y->end; | |
3996 | z->type = y->type; | |
3997 | } | |
177c0ea7 | 3998 | |
34400008 GM |
3999 | if (y->color == MEM_BLACK) |
4000 | mem_delete_fixup (x); | |
877935b1 GM |
4001 | |
4002 | #ifdef GC_MALLOC_CHECK | |
0caaedb1 | 4003 | free (y); |
877935b1 | 4004 | #else |
34400008 | 4005 | xfree (y); |
877935b1 | 4006 | #endif |
34400008 GM |
4007 | } |
4008 | ||
4009 | ||
4010 | /* Re-establish the red-black properties of the tree, after a | |
4011 | deletion. */ | |
4012 | ||
4013 | static void | |
971de7fb | 4014 | mem_delete_fixup (struct mem_node *x) |
34400008 GM |
4015 | { |
4016 | while (x != mem_root && x->color == MEM_BLACK) | |
4017 | { | |
4018 | if (x == x->parent->left) | |
4019 | { | |
4020 | struct mem_node *w = x->parent->right; | |
177c0ea7 | 4021 | |
34400008 GM |
4022 | if (w->color == MEM_RED) |
4023 | { | |
4024 | w->color = MEM_BLACK; | |
4025 | x->parent->color = MEM_RED; | |
4026 | mem_rotate_left (x->parent); | |
4027 | w = x->parent->right; | |
4028 | } | |
177c0ea7 | 4029 | |
34400008 GM |
4030 | if (w->left->color == MEM_BLACK && w->right->color == MEM_BLACK) |
4031 | { | |
4032 | w->color = MEM_RED; | |
4033 | x = x->parent; | |
4034 | } | |
4035 | else | |
4036 | { | |
4037 | if (w->right->color == MEM_BLACK) | |
4038 | { | |
4039 | w->left->color = MEM_BLACK; | |
4040 | w->color = MEM_RED; | |
4041 | mem_rotate_right (w); | |
4042 | w = x->parent->right; | |
4043 | } | |
4044 | w->color = x->parent->color; | |
4045 | x->parent->color = MEM_BLACK; | |
4046 | w->right->color = MEM_BLACK; | |
4047 | mem_rotate_left (x->parent); | |
4048 | x = mem_root; | |
4049 | } | |
4050 | } | |
4051 | else | |
4052 | { | |
4053 | struct mem_node *w = x->parent->left; | |
177c0ea7 | 4054 | |
34400008 GM |
4055 | if (w->color == MEM_RED) |
4056 | { | |
4057 | w->color = MEM_BLACK; | |
4058 | x->parent->color = MEM_RED; | |
4059 | mem_rotate_right (x->parent); | |
4060 | w = x->parent->left; | |
4061 | } | |
177c0ea7 | 4062 | |
34400008 GM |
4063 | if (w->right->color == MEM_BLACK && w->left->color == MEM_BLACK) |
4064 | { | |
4065 | w->color = MEM_RED; | |
4066 | x = x->parent; | |
4067 | } | |
4068 | else | |
4069 | { | |
4070 | if (w->left->color == MEM_BLACK) | |
4071 | { | |
4072 | w->right->color = MEM_BLACK; | |
4073 | w->color = MEM_RED; | |
4074 | mem_rotate_left (w); | |
4075 | w = x->parent->left; | |
4076 | } | |
177c0ea7 | 4077 | |
34400008 GM |
4078 | w->color = x->parent->color; |
4079 | x->parent->color = MEM_BLACK; | |
4080 | w->left->color = MEM_BLACK; | |
4081 | mem_rotate_right (x->parent); | |
4082 | x = mem_root; | |
4083 | } | |
4084 | } | |
4085 | } | |
177c0ea7 | 4086 | |
34400008 GM |
4087 | x->color = MEM_BLACK; |
4088 | } | |
4089 | ||
4090 | ||
4091 | /* Value is non-zero if P is a pointer to a live Lisp string on | |
4092 | the heap. M is a pointer to the mem_block for P. */ | |
4093 | ||
b0ab8123 | 4094 | static bool |
971de7fb | 4095 | live_string_p (struct mem_node *m, void *p) |
34400008 GM |
4096 | { |
4097 | if (m->type == MEM_TYPE_STRING) | |
4098 | { | |
7d652d97 | 4099 | struct string_block *b = m->start; |
14162469 | 4100 | ptrdiff_t offset = (char *) p - (char *) &b->strings[0]; |
34400008 GM |
4101 | |
4102 | /* P must point to the start of a Lisp_String structure, and it | |
4103 | must not be on the free-list. */ | |
176bc847 GM |
4104 | return (offset >= 0 |
4105 | && offset % sizeof b->strings[0] == 0 | |
6b61353c | 4106 | && offset < (STRING_BLOCK_SIZE * sizeof b->strings[0]) |
34400008 GM |
4107 | && ((struct Lisp_String *) p)->data != NULL); |
4108 | } | |
4109 | else | |
4110 | return 0; | |
4111 | } | |
4112 | ||
4113 | ||
4114 | /* Value is non-zero if P is a pointer to a live Lisp cons on | |
4115 | the heap. M is a pointer to the mem_block for P. */ | |
4116 | ||
b0ab8123 | 4117 | static bool |
971de7fb | 4118 | live_cons_p (struct mem_node *m, void *p) |
34400008 GM |
4119 | { |
4120 | if (m->type == MEM_TYPE_CONS) | |
4121 | { | |
7d652d97 | 4122 | struct cons_block *b = m->start; |
14162469 | 4123 | ptrdiff_t offset = (char *) p - (char *) &b->conses[0]; |
34400008 GM |
4124 | |
4125 | /* P must point to the start of a Lisp_Cons, not be | |
4126 | one of the unused cells in the current cons block, | |
4127 | and not be on the free-list. */ | |
176bc847 GM |
4128 | return (offset >= 0 |
4129 | && offset % sizeof b->conses[0] == 0 | |
6b61353c | 4130 | && offset < (CONS_BLOCK_SIZE * sizeof b->conses[0]) |
34400008 GM |
4131 | && (b != cons_block |
4132 | || offset / sizeof b->conses[0] < cons_block_index) | |
c644523b | 4133 | && !EQ (((struct Lisp_Cons *) p)->car, Vdead)); |
34400008 GM |
4134 | } |
4135 | else | |
4136 | return 0; | |
4137 | } | |
4138 | ||
4139 | ||
4140 | /* Value is non-zero if P is a pointer to a live Lisp symbol on | |
4141 | the heap. M is a pointer to the mem_block for P. */ | |
4142 | ||
b0ab8123 | 4143 | static bool |
971de7fb | 4144 | live_symbol_p (struct mem_node *m, void *p) |
34400008 GM |
4145 | { |
4146 | if (m->type == MEM_TYPE_SYMBOL) | |
4147 | { | |
7d652d97 | 4148 | struct symbol_block *b = m->start; |
14162469 | 4149 | ptrdiff_t offset = (char *) p - (char *) &b->symbols[0]; |
177c0ea7 | 4150 | |
34400008 GM |
4151 | /* P must point to the start of a Lisp_Symbol, not be |
4152 | one of the unused cells in the current symbol block, | |
4153 | and not be on the free-list. */ | |
176bc847 GM |
4154 | return (offset >= 0 |
4155 | && offset % sizeof b->symbols[0] == 0 | |
6b61353c | 4156 | && offset < (SYMBOL_BLOCK_SIZE * sizeof b->symbols[0]) |
34400008 GM |
4157 | && (b != symbol_block |
4158 | || offset / sizeof b->symbols[0] < symbol_block_index) | |
c644523b | 4159 | && !EQ (((struct Lisp_Symbol *)p)->function, Vdead)); |
34400008 GM |
4160 | } |
4161 | else | |
4162 | return 0; | |
4163 | } | |
4164 | ||
4165 | ||
4166 | /* Value is non-zero if P is a pointer to a live Lisp float on | |
4167 | the heap. M is a pointer to the mem_block for P. */ | |
4168 | ||
b0ab8123 | 4169 | static bool |
971de7fb | 4170 | live_float_p (struct mem_node *m, void *p) |
34400008 GM |
4171 | { |
4172 | if (m->type == MEM_TYPE_FLOAT) | |
4173 | { | |
7d652d97 | 4174 | struct float_block *b = m->start; |
14162469 | 4175 | ptrdiff_t offset = (char *) p - (char *) &b->floats[0]; |
177c0ea7 | 4176 | |
ab6780cd SM |
4177 | /* P must point to the start of a Lisp_Float and not be |
4178 | one of the unused cells in the current float block. */ | |
176bc847 GM |
4179 | return (offset >= 0 |
4180 | && offset % sizeof b->floats[0] == 0 | |
6b61353c | 4181 | && offset < (FLOAT_BLOCK_SIZE * sizeof b->floats[0]) |
34400008 | 4182 | && (b != float_block |
ab6780cd | 4183 | || offset / sizeof b->floats[0] < float_block_index)); |
34400008 GM |
4184 | } |
4185 | else | |
4186 | return 0; | |
4187 | } | |
4188 | ||
4189 | ||
4190 | /* Value is non-zero if P is a pointer to a live Lisp Misc on | |
4191 | the heap. M is a pointer to the mem_block for P. */ | |
4192 | ||
b0ab8123 | 4193 | static bool |
971de7fb | 4194 | live_misc_p (struct mem_node *m, void *p) |
34400008 GM |
4195 | { |
4196 | if (m->type == MEM_TYPE_MISC) | |
4197 | { | |
7d652d97 | 4198 | struct marker_block *b = m->start; |
14162469 | 4199 | ptrdiff_t offset = (char *) p - (char *) &b->markers[0]; |
177c0ea7 | 4200 | |
34400008 GM |
4201 | /* P must point to the start of a Lisp_Misc, not be |
4202 | one of the unused cells in the current misc block, | |
4203 | and not be on the free-list. */ | |
176bc847 GM |
4204 | return (offset >= 0 |
4205 | && offset % sizeof b->markers[0] == 0 | |
6b61353c | 4206 | && offset < (MARKER_BLOCK_SIZE * sizeof b->markers[0]) |
34400008 GM |
4207 | && (b != marker_block |
4208 | || offset / sizeof b->markers[0] < marker_block_index) | |
d314756e | 4209 | && ((union Lisp_Misc *) p)->u_any.type != Lisp_Misc_Free); |
34400008 GM |
4210 | } |
4211 | else | |
4212 | return 0; | |
4213 | } | |
4214 | ||
4215 | ||
4216 | /* Value is non-zero if P is a pointer to a live vector-like object. | |
4217 | M is a pointer to the mem_block for P. */ | |
4218 | ||
b0ab8123 | 4219 | static bool |
971de7fb | 4220 | live_vector_p (struct mem_node *m, void *p) |
34400008 | 4221 | { |
f3372c87 DA |
4222 | if (m->type == MEM_TYPE_VECTOR_BLOCK) |
4223 | { | |
4224 | /* This memory node corresponds to a vector block. */ | |
7d652d97 | 4225 | struct vector_block *block = m->start; |
f3372c87 DA |
4226 | struct Lisp_Vector *vector = (struct Lisp_Vector *) block->data; |
4227 | ||
4228 | /* P is in the block's allocation range. Scan the block | |
4229 | up to P and see whether P points to the start of some | |
4230 | vector which is not on a free list. FIXME: check whether | |
4231 | some allocation patterns (probably a lot of short vectors) | |
4232 | may cause a substantial overhead of this loop. */ | |
4233 | while (VECTOR_IN_BLOCK (vector, block) | |
4234 | && vector <= (struct Lisp_Vector *) p) | |
4235 | { | |
914adc42 | 4236 | if (!PSEUDOVECTOR_TYPEP (&vector->header, PVEC_FREE) && vector == p) |
f3372c87 DA |
4237 | return 1; |
4238 | else | |
914adc42 | 4239 | vector = ADVANCE (vector, vector_nbytes (vector)); |
f3372c87 DA |
4240 | } |
4241 | } | |
914adc42 DA |
4242 | else if (m->type == MEM_TYPE_VECTORLIKE |
4243 | && (char *) p == ((char *) m->start | |
4244 | + offsetof (struct large_vector, v))) | |
f3372c87 DA |
4245 | /* This memory node corresponds to a large vector. */ |
4246 | return 1; | |
4247 | return 0; | |
34400008 GM |
4248 | } |
4249 | ||
4250 | ||
2336fe58 | 4251 | /* Value is non-zero if P is a pointer to a live buffer. M is a |
34400008 GM |
4252 | pointer to the mem_block for P. */ |
4253 | ||
b0ab8123 | 4254 | static bool |
971de7fb | 4255 | live_buffer_p (struct mem_node *m, void *p) |
34400008 GM |
4256 | { |
4257 | /* P must point to the start of the block, and the buffer | |
4258 | must not have been killed. */ | |
4259 | return (m->type == MEM_TYPE_BUFFER | |
4260 | && p == m->start | |
e34f7f79 | 4261 | && !NILP (((struct buffer *) p)->INTERNAL_FIELD (name))); |
34400008 GM |
4262 | } |
4263 | ||
13c844fb GM |
4264 | #endif /* GC_MARK_STACK || defined GC_MALLOC_CHECK */ |
4265 | ||
4266 | #if GC_MARK_STACK | |
4267 | ||
34400008 GM |
4268 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
4269 | ||
0c5307b0 DA |
4270 | /* Currently not used, but may be called from gdb. */ |
4271 | ||
4272 | void dump_zombies (void) EXTERNALLY_VISIBLE; | |
4273 | ||
34400008 GM |
4274 | /* Array of objects that are kept alive because the C stack contains |
4275 | a pattern that looks like a reference to them . */ | |
4276 | ||
4277 | #define MAX_ZOMBIES 10 | |
4278 | static Lisp_Object zombies[MAX_ZOMBIES]; | |
4279 | ||
4280 | /* Number of zombie objects. */ | |
4281 | ||
211a0b2a | 4282 | static EMACS_INT nzombies; |
34400008 GM |
4283 | |
4284 | /* Number of garbage collections. */ | |
4285 | ||
211a0b2a | 4286 | static EMACS_INT ngcs; |
34400008 GM |
4287 | |
4288 | /* Average percentage of zombies per collection. */ | |
4289 | ||
4290 | static double avg_zombies; | |
4291 | ||
4292 | /* Max. number of live and zombie objects. */ | |
4293 | ||
211a0b2a | 4294 | static EMACS_INT max_live, max_zombies; |
34400008 GM |
4295 | |
4296 | /* Average number of live objects per GC. */ | |
4297 | ||
4298 | static double avg_live; | |
4299 | ||
a7ca3326 | 4300 | DEFUN ("gc-status", Fgc_status, Sgc_status, 0, 0, "", |
7ee72033 | 4301 | doc: /* Show information about live and zombie objects. */) |
5842a27b | 4302 | (void) |
34400008 | 4303 | { |
83fc9c63 | 4304 | Lisp_Object args[8], zombie_list = Qnil; |
211a0b2a | 4305 | EMACS_INT i; |
6e4b3fbe | 4306 | for (i = 0; i < min (MAX_ZOMBIES, nzombies); i++) |
83fc9c63 DL |
4307 | zombie_list = Fcons (zombies[i], zombie_list); |
4308 | args[0] = build_string ("%d GCs, avg live/zombies = %.2f/%.2f (%f%%), max %d/%d\nzombies: %S"); | |
34400008 GM |
4309 | args[1] = make_number (ngcs); |
4310 | args[2] = make_float (avg_live); | |
4311 | args[3] = make_float (avg_zombies); | |
4312 | args[4] = make_float (avg_zombies / avg_live / 100); | |
4313 | args[5] = make_number (max_live); | |
4314 | args[6] = make_number (max_zombies); | |
83fc9c63 DL |
4315 | args[7] = zombie_list; |
4316 | return Fmessage (8, args); | |
34400008 GM |
4317 | } |
4318 | ||
4319 | #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */ | |
4320 | ||
4321 | ||
182ff242 GM |
4322 | /* Mark OBJ if we can prove it's a Lisp_Object. */ |
4323 | ||
b0ab8123 | 4324 | static void |
971de7fb | 4325 | mark_maybe_object (Lisp_Object obj) |
182ff242 | 4326 | { |
b609f591 YM |
4327 | void *po; |
4328 | struct mem_node *m; | |
4329 | ||
4330 | if (INTEGERP (obj)) | |
4331 | return; | |
4332 | ||
4333 | po = (void *) XPNTR (obj); | |
4334 | m = mem_find (po); | |
177c0ea7 | 4335 | |
182ff242 GM |
4336 | if (m != MEM_NIL) |
4337 | { | |
fce31d69 | 4338 | bool mark_p = 0; |
182ff242 | 4339 | |
8e50cc2d | 4340 | switch (XTYPE (obj)) |
182ff242 GM |
4341 | { |
4342 | case Lisp_String: | |
4343 | mark_p = (live_string_p (m, po) | |
4344 | && !STRING_MARKED_P ((struct Lisp_String *) po)); | |
4345 | break; | |
4346 | ||
4347 | case Lisp_Cons: | |
08b7c2cb | 4348 | mark_p = (live_cons_p (m, po) && !CONS_MARKED_P (XCONS (obj))); |
182ff242 GM |
4349 | break; |
4350 | ||
4351 | case Lisp_Symbol: | |
2336fe58 | 4352 | mark_p = (live_symbol_p (m, po) && !XSYMBOL (obj)->gcmarkbit); |
182ff242 GM |
4353 | break; |
4354 | ||
4355 | case Lisp_Float: | |
ab6780cd | 4356 | mark_p = (live_float_p (m, po) && !FLOAT_MARKED_P (XFLOAT (obj))); |
182ff242 GM |
4357 | break; |
4358 | ||
4359 | case Lisp_Vectorlike: | |
8e50cc2d | 4360 | /* Note: can't check BUFFERP before we know it's a |
182ff242 GM |
4361 | buffer because checking that dereferences the pointer |
4362 | PO which might point anywhere. */ | |
4363 | if (live_vector_p (m, po)) | |
8e50cc2d | 4364 | mark_p = !SUBRP (obj) && !VECTOR_MARKED_P (XVECTOR (obj)); |
182ff242 | 4365 | else if (live_buffer_p (m, po)) |
8e50cc2d | 4366 | mark_p = BUFFERP (obj) && !VECTOR_MARKED_P (XBUFFER (obj)); |
182ff242 GM |
4367 | break; |
4368 | ||
4369 | case Lisp_Misc: | |
67ee9f6e | 4370 | mark_p = (live_misc_p (m, po) && !XMISCANY (obj)->gcmarkbit); |
182ff242 | 4371 | break; |
6bbd7a29 | 4372 | |
2de9f71c | 4373 | default: |
6bbd7a29 | 4374 | break; |
182ff242 GM |
4375 | } |
4376 | ||
4377 | if (mark_p) | |
4378 | { | |
4379 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES | |
4380 | if (nzombies < MAX_ZOMBIES) | |
83fc9c63 | 4381 | zombies[nzombies] = obj; |
182ff242 GM |
4382 | ++nzombies; |
4383 | #endif | |
49723c04 | 4384 | mark_object (obj); |
182ff242 GM |
4385 | } |
4386 | } | |
4387 | } | |
ece93c02 GM |
4388 | |
4389 | ||
4390 | /* If P points to Lisp data, mark that as live if it isn't already | |
4391 | marked. */ | |
4392 | ||
b0ab8123 | 4393 | static void |
971de7fb | 4394 | mark_maybe_pointer (void *p) |
ece93c02 GM |
4395 | { |
4396 | struct mem_node *m; | |
4397 | ||
bfe3e0a2 | 4398 | /* Quickly rule out some values which can't point to Lisp data. |
2b90362b | 4399 | USE_LSB_TAG needs Lisp data to be aligned on multiples of GCALIGNMENT. |
bfe3e0a2 | 4400 | Otherwise, assume that Lisp data is aligned on even addresses. */ |
2b90362b | 4401 | if ((intptr_t) p % (USE_LSB_TAG ? GCALIGNMENT : 2)) |
ece93c02 | 4402 | return; |
177c0ea7 | 4403 | |
ece93c02 GM |
4404 | m = mem_find (p); |
4405 | if (m != MEM_NIL) | |
4406 | { | |
4407 | Lisp_Object obj = Qnil; | |
177c0ea7 | 4408 | |
ece93c02 GM |
4409 | switch (m->type) |
4410 | { | |
4411 | case MEM_TYPE_NON_LISP: | |
5474c384 | 4412 | case MEM_TYPE_SPARE: |
2fe50224 | 4413 | /* Nothing to do; not a pointer to Lisp memory. */ |
ece93c02 | 4414 | break; |
177c0ea7 | 4415 | |
ece93c02 | 4416 | case MEM_TYPE_BUFFER: |
5e617bc2 | 4417 | if (live_buffer_p (m, p) && !VECTOR_MARKED_P ((struct buffer *)p)) |
ece93c02 GM |
4418 | XSETVECTOR (obj, p); |
4419 | break; | |
177c0ea7 | 4420 | |
ece93c02 | 4421 | case MEM_TYPE_CONS: |
08b7c2cb | 4422 | if (live_cons_p (m, p) && !CONS_MARKED_P ((struct Lisp_Cons *) p)) |
ece93c02 GM |
4423 | XSETCONS (obj, p); |
4424 | break; | |
177c0ea7 | 4425 | |
ece93c02 GM |
4426 | case MEM_TYPE_STRING: |
4427 | if (live_string_p (m, p) | |
4428 | && !STRING_MARKED_P ((struct Lisp_String *) p)) | |
4429 | XSETSTRING (obj, p); | |
4430 | break; | |
4431 | ||
4432 | case MEM_TYPE_MISC: | |
2336fe58 SM |
4433 | if (live_misc_p (m, p) && !((struct Lisp_Free *) p)->gcmarkbit) |
4434 | XSETMISC (obj, p); | |
ece93c02 | 4435 | break; |
177c0ea7 | 4436 | |
ece93c02 | 4437 | case MEM_TYPE_SYMBOL: |
2336fe58 | 4438 | if (live_symbol_p (m, p) && !((struct Lisp_Symbol *) p)->gcmarkbit) |
ece93c02 GM |
4439 | XSETSYMBOL (obj, p); |
4440 | break; | |
177c0ea7 | 4441 | |
ece93c02 | 4442 | case MEM_TYPE_FLOAT: |
ab6780cd | 4443 | if (live_float_p (m, p) && !FLOAT_MARKED_P (p)) |
ece93c02 GM |
4444 | XSETFLOAT (obj, p); |
4445 | break; | |
177c0ea7 | 4446 | |
9c545a55 | 4447 | case MEM_TYPE_VECTORLIKE: |
f3372c87 | 4448 | case MEM_TYPE_VECTOR_BLOCK: |
ece93c02 GM |
4449 | if (live_vector_p (m, p)) |
4450 | { | |
4451 | Lisp_Object tem; | |
4452 | XSETVECTOR (tem, p); | |
8e50cc2d | 4453 | if (!SUBRP (tem) && !VECTOR_MARKED_P (XVECTOR (tem))) |
ece93c02 GM |
4454 | obj = tem; |
4455 | } | |
4456 | break; | |
4457 | ||
4458 | default: | |
1088b922 | 4459 | emacs_abort (); |
ece93c02 GM |
4460 | } |
4461 | ||
8e50cc2d | 4462 | if (!NILP (obj)) |
49723c04 | 4463 | mark_object (obj); |
ece93c02 GM |
4464 | } |
4465 | } | |
4466 | ||
4467 | ||
e32a5799 | 4468 | /* Alignment of pointer values. Use alignof, as it sometimes returns |
e3fb2efb PE |
4469 | a smaller alignment than GCC's __alignof__ and mark_memory might |
4470 | miss objects if __alignof__ were used. */ | |
e32a5799 | 4471 | #define GC_POINTER_ALIGNMENT alignof (void *) |
3164aeac | 4472 | |
e3fb2efb PE |
4473 | /* Define POINTERS_MIGHT_HIDE_IN_OBJECTS to 1 if marking via C pointers does |
4474 | not suffice, which is the typical case. A host where a Lisp_Object is | |
4475 | wider than a pointer might allocate a Lisp_Object in non-adjacent halves. | |
4476 | If USE_LSB_TAG, the bottom half is not a valid pointer, but it should | |
4477 | suffice to widen it to to a Lisp_Object and check it that way. */ | |
bfe3e0a2 PE |
4478 | #if USE_LSB_TAG || VAL_MAX < UINTPTR_MAX |
4479 | # if !USE_LSB_TAG && VAL_MAX < UINTPTR_MAX >> GCTYPEBITS | |
e3fb2efb PE |
4480 | /* If tag bits straddle pointer-word boundaries, neither mark_maybe_pointer |
4481 | nor mark_maybe_object can follow the pointers. This should not occur on | |
4482 | any practical porting target. */ | |
4483 | # error "MSB type bits straddle pointer-word boundaries" | |
4484 | # endif | |
4485 | /* Marking via C pointers does not suffice, because Lisp_Objects contain | |
4486 | pointer words that hold pointers ORed with type bits. */ | |
4487 | # define POINTERS_MIGHT_HIDE_IN_OBJECTS 1 | |
4488 | #else | |
4489 | /* Marking via C pointers suffices, because Lisp_Objects contain pointer | |
4490 | words that hold unmodified pointers. */ | |
4491 | # define POINTERS_MIGHT_HIDE_IN_OBJECTS 0 | |
4492 | #endif | |
4493 | ||
55a314a5 YM |
4494 | /* Mark Lisp objects referenced from the address range START+OFFSET..END |
4495 | or END+OFFSET..START. */ | |
34400008 | 4496 | |
177c0ea7 | 4497 | static void |
3164aeac | 4498 | mark_memory (void *start, void *end) |
b41253a3 JW |
4499 | #if defined (__clang__) && defined (__has_feature) |
4500 | #if __has_feature(address_sanitizer) | |
ed6b3510 JW |
4501 | /* Do not allow -faddress-sanitizer to check this function, since it |
4502 | crosses the function stack boundary, and thus would yield many | |
4503 | false positives. */ | |
4504 | __attribute__((no_address_safety_analysis)) | |
4505 | #endif | |
b41253a3 | 4506 | #endif |
34400008 | 4507 | { |
ece93c02 | 4508 | void **pp; |
3164aeac | 4509 | int i; |
34400008 GM |
4510 | |
4511 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES | |
4512 | nzombies = 0; | |
4513 | #endif | |
4514 | ||
4515 | /* Make START the pointer to the start of the memory region, | |
4516 | if it isn't already. */ | |
4517 | if (end < start) | |
4518 | { | |
4519 | void *tem = start; | |
4520 | start = end; | |
4521 | end = tem; | |
4522 | } | |
ece93c02 | 4523 | |
ece93c02 GM |
4524 | /* Mark Lisp data pointed to. This is necessary because, in some |
4525 | situations, the C compiler optimizes Lisp objects away, so that | |
4526 | only a pointer to them remains. Example: | |
4527 | ||
4528 | DEFUN ("testme", Ftestme, Stestme, 0, 0, 0, "") | |
7ee72033 | 4529 | () |
ece93c02 GM |
4530 | { |
4531 | Lisp_Object obj = build_string ("test"); | |
4532 | struct Lisp_String *s = XSTRING (obj); | |
4533 | Fgarbage_collect (); | |
4534 | fprintf (stderr, "test `%s'\n", s->data); | |
4535 | return Qnil; | |
4536 | } | |
4537 | ||
4538 | Here, `obj' isn't really used, and the compiler optimizes it | |
4539 | away. The only reference to the life string is through the | |
4540 | pointer `s'. */ | |
177c0ea7 | 4541 | |
3164aeac PE |
4542 | for (pp = start; (void *) pp < end; pp++) |
4543 | for (i = 0; i < sizeof *pp; i += GC_POINTER_ALIGNMENT) | |
27f3c637 | 4544 | { |
e3fb2efb PE |
4545 | void *p = *(void **) ((char *) pp + i); |
4546 | mark_maybe_pointer (p); | |
4547 | if (POINTERS_MIGHT_HIDE_IN_OBJECTS) | |
646b5f55 | 4548 | mark_maybe_object (XIL ((intptr_t) p)); |
27f3c637 | 4549 | } |
182ff242 GM |
4550 | } |
4551 | ||
182ff242 GM |
4552 | #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS |
4553 | ||
fce31d69 PE |
4554 | static bool setjmp_tested_p; |
4555 | static int longjmps_done; | |
182ff242 GM |
4556 | |
4557 | #define SETJMP_WILL_LIKELY_WORK "\ | |
4558 | \n\ | |
4559 | Emacs garbage collector has been changed to use conservative stack\n\ | |
4560 | marking. Emacs has determined that the method it uses to do the\n\ | |
4561 | marking will likely work on your system, but this isn't sure.\n\ | |
4562 | \n\ | |
4563 | If you are a system-programmer, or can get the help of a local wizard\n\ | |
4564 | who is, please take a look at the function mark_stack in alloc.c, and\n\ | |
4565 | verify that the methods used are appropriate for your system.\n\ | |
4566 | \n\ | |
d191623b | 4567 | Please mail the result to <emacs-devel@gnu.org>.\n\ |
182ff242 GM |
4568 | " |
4569 | ||
4570 | #define SETJMP_WILL_NOT_WORK "\ | |
4571 | \n\ | |
4572 | Emacs garbage collector has been changed to use conservative stack\n\ | |
4573 | marking. Emacs has determined that the default method it uses to do the\n\ | |
4574 | marking will not work on your system. We will need a system-dependent\n\ | |
4575 | solution for your system.\n\ | |
4576 | \n\ | |
4577 | Please take a look at the function mark_stack in alloc.c, and\n\ | |
4578 | try to find a way to make it work on your system.\n\ | |
30f637f8 DL |
4579 | \n\ |
4580 | Note that you may get false negatives, depending on the compiler.\n\ | |
4581 | In particular, you need to use -O with GCC for this test.\n\ | |
4582 | \n\ | |
d191623b | 4583 | Please mail the result to <emacs-devel@gnu.org>.\n\ |
182ff242 GM |
4584 | " |
4585 | ||
4586 | ||
4587 | /* Perform a quick check if it looks like setjmp saves registers in a | |
4588 | jmp_buf. Print a message to stderr saying so. When this test | |
4589 | succeeds, this is _not_ a proof that setjmp is sufficient for | |
4590 | conservative stack marking. Only the sources or a disassembly | |
4591 | can prove that. */ | |
4592 | ||
4593 | static void | |
2018939f | 4594 | test_setjmp (void) |
182ff242 GM |
4595 | { |
4596 | char buf[10]; | |
4597 | register int x; | |
0328b6de | 4598 | sys_jmp_buf jbuf; |
182ff242 GM |
4599 | |
4600 | /* Arrange for X to be put in a register. */ | |
4601 | sprintf (buf, "1"); | |
4602 | x = strlen (buf); | |
4603 | x = 2 * x - 1; | |
4604 | ||
0328b6de | 4605 | sys_setjmp (jbuf); |
182ff242 | 4606 | if (longjmps_done == 1) |
34400008 | 4607 | { |
182ff242 | 4608 | /* Came here after the longjmp at the end of the function. |
34400008 | 4609 | |
182ff242 GM |
4610 | If x == 1, the longjmp has restored the register to its |
4611 | value before the setjmp, and we can hope that setjmp | |
4612 | saves all such registers in the jmp_buf, although that | |
4613 | isn't sure. | |
34400008 | 4614 | |
182ff242 GM |
4615 | For other values of X, either something really strange is |
4616 | taking place, or the setjmp just didn't save the register. */ | |
4617 | ||
4618 | if (x == 1) | |
4619 | fprintf (stderr, SETJMP_WILL_LIKELY_WORK); | |
4620 | else | |
4621 | { | |
4622 | fprintf (stderr, SETJMP_WILL_NOT_WORK); | |
4623 | exit (1); | |
34400008 GM |
4624 | } |
4625 | } | |
182ff242 GM |
4626 | |
4627 | ++longjmps_done; | |
4628 | x = 2; | |
4629 | if (longjmps_done == 1) | |
0328b6de | 4630 | sys_longjmp (jbuf, 1); |
34400008 GM |
4631 | } |
4632 | ||
182ff242 GM |
4633 | #endif /* not GC_SAVE_REGISTERS_ON_STACK && not GC_SETJMP_WORKS */ |
4634 | ||
34400008 GM |
4635 | |
4636 | #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS | |
4637 | ||
4638 | /* Abort if anything GCPRO'd doesn't survive the GC. */ | |
4639 | ||
4640 | static void | |
2018939f | 4641 | check_gcpros (void) |
34400008 GM |
4642 | { |
4643 | struct gcpro *p; | |
f66c7cf8 | 4644 | ptrdiff_t i; |
34400008 GM |
4645 | |
4646 | for (p = gcprolist; p; p = p->next) | |
4647 | for (i = 0; i < p->nvars; ++i) | |
4648 | if (!survives_gc_p (p->var[i])) | |
92cc28b2 SM |
4649 | /* FIXME: It's not necessarily a bug. It might just be that the |
4650 | GCPRO is unnecessary or should release the object sooner. */ | |
1088b922 | 4651 | emacs_abort (); |
34400008 GM |
4652 | } |
4653 | ||
4654 | #elif GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES | |
4655 | ||
0c5307b0 | 4656 | void |
2018939f | 4657 | dump_zombies (void) |
34400008 GM |
4658 | { |
4659 | int i; | |
4660 | ||
6e4b3fbe | 4661 | fprintf (stderr, "\nZombies kept alive = %"pI"d:\n", nzombies); |
34400008 GM |
4662 | for (i = 0; i < min (MAX_ZOMBIES, nzombies); ++i) |
4663 | { | |
4664 | fprintf (stderr, " %d = ", i); | |
4665 | debug_print (zombies[i]); | |
4666 | } | |
4667 | } | |
4668 | ||
4669 | #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */ | |
4670 | ||
4671 | ||
182ff242 GM |
4672 | /* Mark live Lisp objects on the C stack. |
4673 | ||
4674 | There are several system-dependent problems to consider when | |
4675 | porting this to new architectures: | |
4676 | ||
4677 | Processor Registers | |
4678 | ||
4679 | We have to mark Lisp objects in CPU registers that can hold local | |
4680 | variables or are used to pass parameters. | |
4681 | ||
4682 | If GC_SAVE_REGISTERS_ON_STACK is defined, it should expand to | |
4683 | something that either saves relevant registers on the stack, or | |
4684 | calls mark_maybe_object passing it each register's contents. | |
4685 | ||
4686 | If GC_SAVE_REGISTERS_ON_STACK is not defined, the current | |
4687 | implementation assumes that calling setjmp saves registers we need | |
4688 | to see in a jmp_buf which itself lies on the stack. This doesn't | |
4689 | have to be true! It must be verified for each system, possibly | |
4690 | by taking a look at the source code of setjmp. | |
4691 | ||
2018939f AS |
4692 | If __builtin_unwind_init is available (defined by GCC >= 2.8) we |
4693 | can use it as a machine independent method to store all registers | |
4694 | to the stack. In this case the macros described in the previous | |
4695 | two paragraphs are not used. | |
4696 | ||
182ff242 GM |
4697 | Stack Layout |
4698 | ||
4699 | Architectures differ in the way their processor stack is organized. | |
4700 | For example, the stack might look like this | |
4701 | ||
4702 | +----------------+ | |
4703 | | Lisp_Object | size = 4 | |
4704 | +----------------+ | |
4705 | | something else | size = 2 | |
4706 | +----------------+ | |
4707 | | Lisp_Object | size = 4 | |
4708 | +----------------+ | |
4709 | | ... | | |
4710 | ||
4711 | In such a case, not every Lisp_Object will be aligned equally. To | |
4712 | find all Lisp_Object on the stack it won't be sufficient to walk | |
4713 | the stack in steps of 4 bytes. Instead, two passes will be | |
4714 | necessary, one starting at the start of the stack, and a second | |
4715 | pass starting at the start of the stack + 2. Likewise, if the | |
4716 | minimal alignment of Lisp_Objects on the stack is 1, four passes | |
4717 | would be necessary, each one starting with one byte more offset | |
c9af454e | 4718 | from the stack start. */ |
34400008 GM |
4719 | |
4720 | static void | |
971de7fb | 4721 | mark_stack (void) |
34400008 | 4722 | { |
34400008 GM |
4723 | void *end; |
4724 | ||
2018939f AS |
4725 | #ifdef HAVE___BUILTIN_UNWIND_INIT |
4726 | /* Force callee-saved registers and register windows onto the stack. | |
4727 | This is the preferred method if available, obviating the need for | |
4728 | machine dependent methods. */ | |
4729 | __builtin_unwind_init (); | |
4730 | end = &end; | |
4731 | #else /* not HAVE___BUILTIN_UNWIND_INIT */ | |
dff45157 PE |
4732 | #ifndef GC_SAVE_REGISTERS_ON_STACK |
4733 | /* jmp_buf may not be aligned enough on darwin-ppc64 */ | |
4734 | union aligned_jmpbuf { | |
4735 | Lisp_Object o; | |
0328b6de | 4736 | sys_jmp_buf j; |
dff45157 | 4737 | } j; |
fce31d69 | 4738 | volatile bool stack_grows_down_p = (char *) &j > (char *) stack_base; |
dff45157 | 4739 | #endif |
34400008 GM |
4740 | /* This trick flushes the register windows so that all the state of |
4741 | the process is contained in the stack. */ | |
ab6780cd | 4742 | /* Fixme: Code in the Boehm GC suggests flushing (with `flushrs') is |
422eec7e DL |
4743 | needed on ia64 too. See mach_dep.c, where it also says inline |
4744 | assembler doesn't work with relevant proprietary compilers. */ | |
4a00783e | 4745 | #ifdef __sparc__ |
4d18a7a2 DN |
4746 | #if defined (__sparc64__) && defined (__FreeBSD__) |
4747 | /* FreeBSD does not have a ta 3 handler. */ | |
4c1616be CY |
4748 | asm ("flushw"); |
4749 | #else | |
34400008 | 4750 | asm ("ta 3"); |
4c1616be | 4751 | #endif |
34400008 | 4752 | #endif |
177c0ea7 | 4753 | |
34400008 GM |
4754 | /* Save registers that we need to see on the stack. We need to see |
4755 | registers used to hold register variables and registers used to | |
4756 | pass parameters. */ | |
4757 | #ifdef GC_SAVE_REGISTERS_ON_STACK | |
4758 | GC_SAVE_REGISTERS_ON_STACK (end); | |
182ff242 | 4759 | #else /* not GC_SAVE_REGISTERS_ON_STACK */ |
177c0ea7 | 4760 | |
182ff242 GM |
4761 | #ifndef GC_SETJMP_WORKS /* If it hasn't been checked yet that |
4762 | setjmp will definitely work, test it | |
4763 | and print a message with the result | |
4764 | of the test. */ | |
4765 | if (!setjmp_tested_p) | |
4766 | { | |
4767 | setjmp_tested_p = 1; | |
4768 | test_setjmp (); | |
4769 | } | |
4770 | #endif /* GC_SETJMP_WORKS */ | |
177c0ea7 | 4771 | |
0328b6de | 4772 | sys_setjmp (j.j); |
34400008 | 4773 | end = stack_grows_down_p ? (char *) &j + sizeof j : (char *) &j; |
182ff242 | 4774 | #endif /* not GC_SAVE_REGISTERS_ON_STACK */ |
2018939f | 4775 | #endif /* not HAVE___BUILTIN_UNWIND_INIT */ |
34400008 GM |
4776 | |
4777 | /* This assumes that the stack is a contiguous region in memory. If | |
182ff242 GM |
4778 | that's not the case, something has to be done here to iterate |
4779 | over the stack segments. */ | |
3164aeac PE |
4780 | mark_memory (stack_base, end); |
4781 | ||
4dec23ff AS |
4782 | /* Allow for marking a secondary stack, like the register stack on the |
4783 | ia64. */ | |
4784 | #ifdef GC_MARK_SECONDARY_STACK | |
4785 | GC_MARK_SECONDARY_STACK (); | |
4786 | #endif | |
34400008 GM |
4787 | |
4788 | #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS | |
4789 | check_gcpros (); | |
4790 | #endif | |
4791 | } | |
4792 | ||
0c5307b0 DA |
4793 | #else /* GC_MARK_STACK == 0 */ |
4794 | ||
4795 | #define mark_maybe_object(obj) emacs_abort () | |
4796 | ||
34400008 GM |
4797 | #endif /* GC_MARK_STACK != 0 */ |
4798 | ||
4799 | ||
7ffb6955 | 4800 | /* Determine whether it is safe to access memory at address P. */ |
d3d47262 | 4801 | static int |
971de7fb | 4802 | valid_pointer_p (void *p) |
7ffb6955 | 4803 | { |
f892cf9c EZ |
4804 | #ifdef WINDOWSNT |
4805 | return w32_valid_pointer_p (p, 16); | |
4806 | #else | |
41bed37d | 4807 | int fd[2]; |
7ffb6955 KS |
4808 | |
4809 | /* Obviously, we cannot just access it (we would SEGV trying), so we | |
4810 | trick the o/s to tell us whether p is a valid pointer. | |
4811 | Unfortunately, we cannot use NULL_DEVICE here, as emacs_write may | |
4812 | not validate p in that case. */ | |
4813 | ||
c7ddc792 | 4814 | if (emacs_pipe (fd) == 0) |
7ffb6955 | 4815 | { |
fce31d69 | 4816 | bool valid = emacs_write (fd[1], (char *) p, 16) == 16; |
41bed37d PE |
4817 | emacs_close (fd[1]); |
4818 | emacs_close (fd[0]); | |
7ffb6955 KS |
4819 | return valid; |
4820 | } | |
4821 | ||
4822 | return -1; | |
f892cf9c | 4823 | #endif |
7ffb6955 | 4824 | } |
3cd55735 | 4825 | |
6cda572a DA |
4826 | /* Return 2 if OBJ is a killed or special buffer object, 1 if OBJ is a |
4827 | valid lisp object, 0 if OBJ is NOT a valid lisp object, or -1 if we | |
4828 | cannot validate OBJ. This function can be quite slow, so its primary | |
4829 | use is the manual debugging. The only exception is print_object, where | |
4830 | we use it to check whether the memory referenced by the pointer of | |
4831 | Lisp_Save_Value object contains valid objects. */ | |
3cd55735 KS |
4832 | |
4833 | int | |
971de7fb | 4834 | valid_lisp_object_p (Lisp_Object obj) |
3cd55735 | 4835 | { |
de7124a7 | 4836 | void *p; |
7ffb6955 | 4837 | #if GC_MARK_STACK |
3cd55735 | 4838 | struct mem_node *m; |
de7124a7 | 4839 | #endif |
3cd55735 KS |
4840 | |
4841 | if (INTEGERP (obj)) | |
4842 | return 1; | |
4843 | ||
4844 | p = (void *) XPNTR (obj); | |
3cd55735 KS |
4845 | if (PURE_POINTER_P (p)) |
4846 | return 1; | |
4847 | ||
c1ca42ca DA |
4848 | if (p == &buffer_defaults || p == &buffer_local_symbols) |
4849 | return 2; | |
4850 | ||
de7124a7 | 4851 | #if !GC_MARK_STACK |
7ffb6955 | 4852 | return valid_pointer_p (p); |
de7124a7 KS |
4853 | #else |
4854 | ||
3cd55735 KS |
4855 | m = mem_find (p); |
4856 | ||
4857 | if (m == MEM_NIL) | |
7ffb6955 KS |
4858 | { |
4859 | int valid = valid_pointer_p (p); | |
4860 | if (valid <= 0) | |
4861 | return valid; | |
4862 | ||
4863 | if (SUBRP (obj)) | |
4864 | return 1; | |
4865 | ||
4866 | return 0; | |
4867 | } | |
3cd55735 KS |
4868 | |
4869 | switch (m->type) | |
4870 | { | |
4871 | case MEM_TYPE_NON_LISP: | |
5474c384 | 4872 | case MEM_TYPE_SPARE: |
3cd55735 KS |
4873 | return 0; |
4874 | ||
4875 | case MEM_TYPE_BUFFER: | |
c1ca42ca | 4876 | return live_buffer_p (m, p) ? 1 : 2; |
3cd55735 KS |
4877 | |
4878 | case MEM_TYPE_CONS: | |
4879 | return live_cons_p (m, p); | |
4880 | ||
4881 | case MEM_TYPE_STRING: | |
4882 | return live_string_p (m, p); | |
4883 | ||
4884 | case MEM_TYPE_MISC: | |
4885 | return live_misc_p (m, p); | |
4886 | ||
4887 | case MEM_TYPE_SYMBOL: | |
4888 | return live_symbol_p (m, p); | |
4889 | ||
4890 | case MEM_TYPE_FLOAT: | |
4891 | return live_float_p (m, p); | |
4892 | ||
9c545a55 | 4893 | case MEM_TYPE_VECTORLIKE: |
f3372c87 | 4894 | case MEM_TYPE_VECTOR_BLOCK: |
3cd55735 KS |
4895 | return live_vector_p (m, p); |
4896 | ||
4897 | default: | |
4898 | break; | |
4899 | } | |
4900 | ||
4901 | return 0; | |
4902 | #endif | |
4903 | } | |
4904 | ||
4905 | ||
4906 | ||
34400008 | 4907 | \f |
2e471eb5 GM |
4908 | /*********************************************************************** |
4909 | Pure Storage Management | |
4910 | ***********************************************************************/ | |
4911 | ||
1f0b3fd2 GM |
4912 | /* Allocate room for SIZE bytes from pure Lisp storage and return a |
4913 | pointer to it. TYPE is the Lisp type for which the memory is | |
e5bc14d4 | 4914 | allocated. TYPE < 0 means it's not used for a Lisp object. */ |
1f0b3fd2 | 4915 | |
261cb4bb | 4916 | static void * |
971de7fb | 4917 | pure_alloc (size_t size, int type) |
1f0b3fd2 | 4918 | { |
261cb4bb | 4919 | void *result; |
bfe3e0a2 | 4920 | #if USE_LSB_TAG |
2b90362b | 4921 | size_t alignment = GCALIGNMENT; |
6b61353c | 4922 | #else |
e32a5799 | 4923 | size_t alignment = alignof (EMACS_INT); |
1f0b3fd2 GM |
4924 | |
4925 | /* Give Lisp_Floats an extra alignment. */ | |
4926 | if (type == Lisp_Float) | |
e32a5799 | 4927 | alignment = alignof (struct Lisp_Float); |
6b61353c | 4928 | #endif |
1f0b3fd2 | 4929 | |
44117420 | 4930 | again: |
e5bc14d4 YM |
4931 | if (type >= 0) |
4932 | { | |
4933 | /* Allocate space for a Lisp object from the beginning of the free | |
4934 | space with taking account of alignment. */ | |
4935 | result = ALIGN (purebeg + pure_bytes_used_lisp, alignment); | |
4936 | pure_bytes_used_lisp = ((char *)result - (char *)purebeg) + size; | |
4937 | } | |
4938 | else | |
4939 | { | |
4940 | /* Allocate space for a non-Lisp object from the end of the free | |
4941 | space. */ | |
4942 | pure_bytes_used_non_lisp += size; | |
4943 | result = purebeg + pure_size - pure_bytes_used_non_lisp; | |
4944 | } | |
4945 | pure_bytes_used = pure_bytes_used_lisp + pure_bytes_used_non_lisp; | |
44117420 KS |
4946 | |
4947 | if (pure_bytes_used <= pure_size) | |
4948 | return result; | |
4949 | ||
4950 | /* Don't allocate a large amount here, | |
4951 | because it might get mmap'd and then its address | |
4952 | might not be usable. */ | |
23f86fce | 4953 | purebeg = xmalloc (10000); |
44117420 KS |
4954 | pure_size = 10000; |
4955 | pure_bytes_used_before_overflow += pure_bytes_used - size; | |
4956 | pure_bytes_used = 0; | |
e5bc14d4 | 4957 | pure_bytes_used_lisp = pure_bytes_used_non_lisp = 0; |
44117420 | 4958 | goto again; |
1f0b3fd2 GM |
4959 | } |
4960 | ||
4961 | ||
852f8cdc | 4962 | /* Print a warning if PURESIZE is too small. */ |
9e713715 GM |
4963 | |
4964 | void | |
971de7fb | 4965 | check_pure_size (void) |
9e713715 GM |
4966 | { |
4967 | if (pure_bytes_used_before_overflow) | |
c2982e87 PE |
4968 | message (("emacs:0:Pure Lisp storage overflow (approx. %"pI"d" |
4969 | " bytes needed)"), | |
4970 | pure_bytes_used + pure_bytes_used_before_overflow); | |
9e713715 GM |
4971 | } |
4972 | ||
4973 | ||
79fd0489 YM |
4974 | /* Find the byte sequence {DATA[0], ..., DATA[NBYTES-1], '\0'} from |
4975 | the non-Lisp data pool of the pure storage, and return its start | |
4976 | address. Return NULL if not found. */ | |
4977 | ||
4978 | static char * | |
d311d28c | 4979 | find_string_data_in_pure (const char *data, ptrdiff_t nbytes) |
79fd0489 | 4980 | { |
14162469 | 4981 | int i; |
d311d28c | 4982 | ptrdiff_t skip, bm_skip[256], last_char_skip, infinity, start, start_max; |
2aff7c53 | 4983 | const unsigned char *p; |
79fd0489 YM |
4984 | char *non_lisp_beg; |
4985 | ||
d311d28c | 4986 | if (pure_bytes_used_non_lisp <= nbytes) |
79fd0489 YM |
4987 | return NULL; |
4988 | ||
4989 | /* Set up the Boyer-Moore table. */ | |
4990 | skip = nbytes + 1; | |
4991 | for (i = 0; i < 256; i++) | |
4992 | bm_skip[i] = skip; | |
4993 | ||
2aff7c53 | 4994 | p = (const unsigned char *) data; |
79fd0489 YM |
4995 | while (--skip > 0) |
4996 | bm_skip[*p++] = skip; | |
4997 | ||
4998 | last_char_skip = bm_skip['\0']; | |
4999 | ||
5000 | non_lisp_beg = purebeg + pure_size - pure_bytes_used_non_lisp; | |
5001 | start_max = pure_bytes_used_non_lisp - (nbytes + 1); | |
5002 | ||
5003 | /* See the comments in the function `boyer_moore' (search.c) for the | |
5004 | use of `infinity'. */ | |
5005 | infinity = pure_bytes_used_non_lisp + 1; | |
5006 | bm_skip['\0'] = infinity; | |
5007 | ||
2aff7c53 | 5008 | p = (const unsigned char *) non_lisp_beg + nbytes; |
79fd0489 YM |
5009 | start = 0; |
5010 | do | |
5011 | { | |
5012 | /* Check the last character (== '\0'). */ | |
5013 | do | |
5014 | { | |
5015 | start += bm_skip[*(p + start)]; | |
5016 | } | |
5017 | while (start <= start_max); | |
5018 | ||
5019 | if (start < infinity) | |
5020 | /* Couldn't find the last character. */ | |
5021 | return NULL; | |
5022 | ||
5023 | /* No less than `infinity' means we could find the last | |
5024 | character at `p[start - infinity]'. */ | |
5025 | start -= infinity; | |
5026 | ||
5027 | /* Check the remaining characters. */ | |
5028 | if (memcmp (data, non_lisp_beg + start, nbytes) == 0) | |
5029 | /* Found. */ | |
5030 | return non_lisp_beg + start; | |
5031 | ||
5032 | start += last_char_skip; | |
5033 | } | |
5034 | while (start <= start_max); | |
5035 | ||
5036 | return NULL; | |
5037 | } | |
5038 | ||
5039 | ||
2e471eb5 GM |
5040 | /* Return a string allocated in pure space. DATA is a buffer holding |
5041 | NCHARS characters, and NBYTES bytes of string data. MULTIBYTE | |
fce31d69 | 5042 | means make the result string multibyte. |
1a4f1e2c | 5043 | |
2e471eb5 GM |
5044 | Must get an error if pure storage is full, since if it cannot hold |
5045 | a large string it may be able to hold conses that point to that | |
5046 | string; then the string is not protected from gc. */ | |
7146af97 JB |
5047 | |
5048 | Lisp_Object | |
14162469 | 5049 | make_pure_string (const char *data, |
fce31d69 | 5050 | ptrdiff_t nchars, ptrdiff_t nbytes, bool multibyte) |
7146af97 | 5051 | { |
2e471eb5 | 5052 | Lisp_Object string; |
98c6f1e3 | 5053 | struct Lisp_String *s = pure_alloc (sizeof *s, Lisp_String); |
90256841 | 5054 | s->data = (unsigned char *) find_string_data_in_pure (data, nbytes); |
79fd0489 YM |
5055 | if (s->data == NULL) |
5056 | { | |
98c6f1e3 | 5057 | s->data = pure_alloc (nbytes + 1, -1); |
72af86bd | 5058 | memcpy (s->data, data, nbytes); |
79fd0489 YM |
5059 | s->data[nbytes] = '\0'; |
5060 | } | |
2e471eb5 GM |
5061 | s->size = nchars; |
5062 | s->size_byte = multibyte ? nbytes : -1; | |
77c7bcb1 | 5063 | s->intervals = NULL; |
2e471eb5 GM |
5064 | XSETSTRING (string, s); |
5065 | return string; | |
7146af97 JB |
5066 | } |
5067 | ||
2a0213a6 DA |
5068 | /* Return a string allocated in pure space. Do not |
5069 | allocate the string data, just point to DATA. */ | |
a56eaaef DN |
5070 | |
5071 | Lisp_Object | |
2a0213a6 | 5072 | make_pure_c_string (const char *data, ptrdiff_t nchars) |
a56eaaef DN |
5073 | { |
5074 | Lisp_Object string; | |
98c6f1e3 | 5075 | struct Lisp_String *s = pure_alloc (sizeof *s, Lisp_String); |
a56eaaef DN |
5076 | s->size = nchars; |
5077 | s->size_byte = -1; | |
323637a2 | 5078 | s->data = (unsigned char *) data; |
77c7bcb1 | 5079 | s->intervals = NULL; |
a56eaaef DN |
5080 | XSETSTRING (string, s); |
5081 | return string; | |
5082 | } | |
2e471eb5 | 5083 | |
34400008 GM |
5084 | /* Return a cons allocated from pure space. Give it pure copies |
5085 | of CAR as car and CDR as cdr. */ | |
5086 | ||
7146af97 | 5087 | Lisp_Object |
971de7fb | 5088 | pure_cons (Lisp_Object car, Lisp_Object cdr) |
7146af97 | 5089 | { |
98c6f1e3 PE |
5090 | Lisp_Object new; |
5091 | struct Lisp_Cons *p = pure_alloc (sizeof *p, Lisp_Cons); | |
1f0b3fd2 | 5092 | XSETCONS (new, p); |
f3fbd155 KR |
5093 | XSETCAR (new, Fpurecopy (car)); |
5094 | XSETCDR (new, Fpurecopy (cdr)); | |
7146af97 JB |
5095 | return new; |
5096 | } | |
5097 | ||
7146af97 | 5098 | |
34400008 GM |
5099 | /* Value is a float object with value NUM allocated from pure space. */ |
5100 | ||
d3d47262 | 5101 | static Lisp_Object |
971de7fb | 5102 | make_pure_float (double num) |
7146af97 | 5103 | { |
98c6f1e3 PE |
5104 | Lisp_Object new; |
5105 | struct Lisp_Float *p = pure_alloc (sizeof *p, Lisp_Float); | |
1f0b3fd2 | 5106 | XSETFLOAT (new, p); |
f601cdf3 | 5107 | XFLOAT_INIT (new, num); |
7146af97 JB |
5108 | return new; |
5109 | } | |
5110 | ||
34400008 GM |
5111 | |
5112 | /* Return a vector with room for LEN Lisp_Objects allocated from | |
5113 | pure space. */ | |
5114 | ||
72cb32cf | 5115 | static Lisp_Object |
d311d28c | 5116 | make_pure_vector (ptrdiff_t len) |
7146af97 | 5117 | { |
1f0b3fd2 | 5118 | Lisp_Object new; |
d06714cb | 5119 | size_t size = header_size + len * word_size; |
98c6f1e3 | 5120 | struct Lisp_Vector *p = pure_alloc (size, Lisp_Vectorlike); |
1f0b3fd2 | 5121 | XSETVECTOR (new, p); |
eab3844f | 5122 | XVECTOR (new)->header.size = len; |
7146af97 JB |
5123 | return new; |
5124 | } | |
5125 | ||
34400008 | 5126 | |
a7ca3326 | 5127 | DEFUN ("purecopy", Fpurecopy, Spurecopy, 1, 1, 0, |
909e3b33 | 5128 | doc: /* Make a copy of object OBJ in pure storage. |
228299fa | 5129 | Recursively copies contents of vectors and cons cells. |
7ee72033 | 5130 | Does not copy symbols. Copies strings without text properties. */) |
5842a27b | 5131 | (register Lisp_Object obj) |
7146af97 | 5132 | { |
265a9e55 | 5133 | if (NILP (Vpurify_flag)) |
7146af97 JB |
5134 | return obj; |
5135 | ||
1f0b3fd2 | 5136 | if (PURE_POINTER_P (XPNTR (obj))) |
7146af97 JB |
5137 | return obj; |
5138 | ||
e9515805 SM |
5139 | if (HASH_TABLE_P (Vpurify_flag)) /* Hash consing. */ |
5140 | { | |
5141 | Lisp_Object tmp = Fgethash (obj, Vpurify_flag, Qnil); | |
5142 | if (!NILP (tmp)) | |
5143 | return tmp; | |
5144 | } | |
5145 | ||
d6dd74bb | 5146 | if (CONSP (obj)) |
e9515805 | 5147 | obj = pure_cons (XCAR (obj), XCDR (obj)); |
d6dd74bb | 5148 | else if (FLOATP (obj)) |
e9515805 | 5149 | obj = make_pure_float (XFLOAT_DATA (obj)); |
d6dd74bb | 5150 | else if (STRINGP (obj)) |
42a5b22f | 5151 | obj = make_pure_string (SSDATA (obj), SCHARS (obj), |
e9515805 SM |
5152 | SBYTES (obj), |
5153 | STRING_MULTIBYTE (obj)); | |
876c194c | 5154 | else if (COMPILEDP (obj) || VECTORP (obj)) |
d6dd74bb KH |
5155 | { |
5156 | register struct Lisp_Vector *vec; | |
d311d28c PE |
5157 | register ptrdiff_t i; |
5158 | ptrdiff_t size; | |
d6dd74bb | 5159 | |
77b37c05 | 5160 | size = ASIZE (obj); |
7d535c68 KH |
5161 | if (size & PSEUDOVECTOR_FLAG) |
5162 | size &= PSEUDOVECTOR_SIZE_MASK; | |
6b61353c | 5163 | vec = XVECTOR (make_pure_vector (size)); |
d6dd74bb | 5164 | for (i = 0; i < size; i++) |
28be1ada | 5165 | vec->contents[i] = Fpurecopy (AREF (obj, i)); |
876c194c | 5166 | if (COMPILEDP (obj)) |
985773c9 | 5167 | { |
876c194c SM |
5168 | XSETPVECTYPE (vec, PVEC_COMPILED); |
5169 | XSETCOMPILED (obj, vec); | |
985773c9 | 5170 | } |
d6dd74bb KH |
5171 | else |
5172 | XSETVECTOR (obj, vec); | |
7146af97 | 5173 | } |
d6dd74bb KH |
5174 | else if (MARKERP (obj)) |
5175 | error ("Attempt to copy a marker to pure storage"); | |
e9515805 SM |
5176 | else |
5177 | /* Not purified, don't hash-cons. */ | |
5178 | return obj; | |
5179 | ||
5180 | if (HASH_TABLE_P (Vpurify_flag)) /* Hash consing. */ | |
5181 | Fputhash (obj, obj, Vpurify_flag); | |
6bbd7a29 GM |
5182 | |
5183 | return obj; | |
7146af97 | 5184 | } |
2e471eb5 | 5185 | |
34400008 | 5186 | |
7146af97 | 5187 | \f |
34400008 GM |
5188 | /*********************************************************************** |
5189 | Protection from GC | |
5190 | ***********************************************************************/ | |
5191 | ||
2e471eb5 GM |
5192 | /* Put an entry in staticvec, pointing at the variable with address |
5193 | VARADDRESS. */ | |
7146af97 JB |
5194 | |
5195 | void | |
971de7fb | 5196 | staticpro (Lisp_Object *varaddress) |
7146af97 | 5197 | { |
7146af97 | 5198 | if (staticidx >= NSTATICS) |
afb8aa24 | 5199 | fatal ("NSTATICS too small; try increasing and recompiling Emacs."); |
4195afc3 | 5200 | staticvec[staticidx++] = varaddress; |
7146af97 JB |
5201 | } |
5202 | ||
7146af97 | 5203 | \f |
34400008 GM |
5204 | /*********************************************************************** |
5205 | Protection from GC | |
5206 | ***********************************************************************/ | |
1a4f1e2c | 5207 | |
e8197642 RS |
5208 | /* Temporarily prevent garbage collection. */ |
5209 | ||
d311d28c | 5210 | ptrdiff_t |
971de7fb | 5211 | inhibit_garbage_collection (void) |
e8197642 | 5212 | { |
d311d28c | 5213 | ptrdiff_t count = SPECPDL_INDEX (); |
54defd0d | 5214 | |
6349ae4d | 5215 | specbind (Qgc_cons_threshold, make_number (MOST_POSITIVE_FIXNUM)); |
e8197642 RS |
5216 | return count; |
5217 | } | |
5218 | ||
3ab6e069 DA |
5219 | /* Used to avoid possible overflows when |
5220 | converting from C to Lisp integers. */ | |
5221 | ||
b0ab8123 | 5222 | static Lisp_Object |
3ab6e069 DA |
5223 | bounded_number (EMACS_INT number) |
5224 | { | |
5225 | return make_number (min (MOST_POSITIVE_FIXNUM, number)); | |
5226 | } | |
34400008 | 5227 | |
12b3895d TM |
5228 | /* Calculate total bytes of live objects. */ |
5229 | ||
5230 | static size_t | |
5231 | total_bytes_of_live_objects (void) | |
5232 | { | |
5233 | size_t tot = 0; | |
5234 | tot += total_conses * sizeof (struct Lisp_Cons); | |
5235 | tot += total_symbols * sizeof (struct Lisp_Symbol); | |
5236 | tot += total_markers * sizeof (union Lisp_Misc); | |
5237 | tot += total_string_bytes; | |
5238 | tot += total_vector_slots * word_size; | |
5239 | tot += total_floats * sizeof (struct Lisp_Float); | |
5240 | tot += total_intervals * sizeof (struct interval); | |
5241 | tot += total_strings * sizeof (struct Lisp_String); | |
5242 | return tot; | |
5243 | } | |
5244 | ||
a7ca3326 | 5245 | DEFUN ("garbage-collect", Fgarbage_collect, Sgarbage_collect, 0, 0, "", |
7ee72033 | 5246 | doc: /* Reclaim storage for Lisp objects no longer needed. |
e1e37596 RS |
5247 | Garbage collection happens automatically if you cons more than |
5248 | `gc-cons-threshold' bytes of Lisp data since previous garbage collection. | |
5db81e33 SM |
5249 | `garbage-collect' normally returns a list with info on amount of space in use, |
5250 | where each entry has the form (NAME SIZE USED FREE), where: | |
5251 | - NAME is a symbol describing the kind of objects this entry represents, | |
5252 | - SIZE is the number of bytes used by each one, | |
5253 | - USED is the number of those objects that were found live in the heap, | |
5254 | - FREE is the number of those objects that are not live but that Emacs | |
5255 | keeps around for future allocations (maybe because it does not know how | |
5256 | to return them to the OS). | |
e1e37596 | 5257 | However, if there was overflow in pure space, `garbage-collect' |
999dd333 GM |
5258 | returns nil, because real GC can't be done. |
5259 | See Info node `(elisp)Garbage Collection'. */) | |
5842a27b | 5260 | (void) |
7146af97 | 5261 | { |
fce31d69 | 5262 | struct buffer *nextb; |
7146af97 | 5263 | char stack_top_variable; |
f66c7cf8 | 5264 | ptrdiff_t i; |
fce31d69 | 5265 | bool message_p; |
d311d28c | 5266 | ptrdiff_t count = SPECPDL_INDEX (); |
43aac990 | 5267 | struct timespec start; |
fecbd8ff | 5268 | Lisp_Object retval = Qnil; |
12b3895d | 5269 | size_t tot_before = 0; |
2c5bd608 | 5270 | |
3de0effb | 5271 | if (abort_on_gc) |
1088b922 | 5272 | emacs_abort (); |
3de0effb | 5273 | |
9e713715 GM |
5274 | /* Can't GC if pure storage overflowed because we can't determine |
5275 | if something is a pure object or not. */ | |
5276 | if (pure_bytes_used_before_overflow) | |
5277 | return Qnil; | |
5278 | ||
3d80c99f | 5279 | /* Record this function, so it appears on the profiler's backtraces. */ |
2f592f95 | 5280 | record_in_backtrace (Qautomatic_gc, &Qnil, 0); |
3d80c99f | 5281 | |
7e63e0c3 | 5282 | check_cons_list (); |
bbc012e0 | 5283 | |
3c7e66a8 RS |
5284 | /* Don't keep undo information around forever. |
5285 | Do this early on, so it is no problem if the user quits. */ | |
52b852c7 | 5286 | FOR_EACH_BUFFER (nextb) |
9cd47b72 | 5287 | compact_buffer (nextb); |
3c7e66a8 | 5288 | |
6521894d | 5289 | if (profiler_memory_running) |
12b3895d TM |
5290 | tot_before = total_bytes_of_live_objects (); |
5291 | ||
43aac990 | 5292 | start = current_timespec (); |
3c7e66a8 | 5293 | |
58595309 KH |
5294 | /* In case user calls debug_print during GC, |
5295 | don't let that cause a recursive GC. */ | |
5296 | consing_since_gc = 0; | |
5297 | ||
6efc7df7 GM |
5298 | /* Save what's currently displayed in the echo area. */ |
5299 | message_p = push_message (); | |
27e498e6 | 5300 | record_unwind_protect_void (pop_message_unwind); |
41c28a37 | 5301 | |
7146af97 JB |
5302 | /* Save a copy of the contents of the stack, for debugging. */ |
5303 | #if MAX_SAVE_STACK > 0 | |
265a9e55 | 5304 | if (NILP (Vpurify_flag)) |
7146af97 | 5305 | { |
dd3f25f7 | 5306 | char *stack; |
903fe15d | 5307 | ptrdiff_t stack_size; |
dd3f25f7 | 5308 | if (&stack_top_variable < stack_bottom) |
7146af97 | 5309 | { |
dd3f25f7 PE |
5310 | stack = &stack_top_variable; |
5311 | stack_size = stack_bottom - &stack_top_variable; | |
5312 | } | |
5313 | else | |
5314 | { | |
5315 | stack = stack_bottom; | |
5316 | stack_size = &stack_top_variable - stack_bottom; | |
5317 | } | |
5318 | if (stack_size <= MAX_SAVE_STACK) | |
7146af97 | 5319 | { |
dd3f25f7 | 5320 | if (stack_copy_size < stack_size) |
7146af97 | 5321 | { |
38182d90 | 5322 | stack_copy = xrealloc (stack_copy, stack_size); |
dd3f25f7 | 5323 | stack_copy_size = stack_size; |
7146af97 | 5324 | } |
dd3f25f7 | 5325 | memcpy (stack_copy, stack, stack_size); |
7146af97 JB |
5326 | } |
5327 | } | |
5328 | #endif /* MAX_SAVE_STACK > 0 */ | |
5329 | ||
299585ee | 5330 | if (garbage_collection_messages) |
691c4285 | 5331 | message1_nolog ("Garbage collecting..."); |
7146af97 | 5332 | |
4d7e6e51 | 5333 | block_input (); |
6e0fca1d | 5334 | |
eec7b73d RS |
5335 | shrink_regexp_cache (); |
5336 | ||
7146af97 JB |
5337 | gc_in_progress = 1; |
5338 | ||
005ca5c7 | 5339 | /* Mark all the special slots that serve as the roots of accessibility. */ |
7146af97 | 5340 | |
c752cfa9 DA |
5341 | mark_buffer (&buffer_defaults); |
5342 | mark_buffer (&buffer_local_symbols); | |
5343 | ||
7146af97 | 5344 | for (i = 0; i < staticidx; i++) |
49723c04 | 5345 | mark_object (*staticvec[i]); |
34400008 | 5346 | |
2f592f95 | 5347 | mark_specpdl (); |
6ed8eeff | 5348 | mark_terminals (); |
126f9c02 SM |
5349 | mark_kboards (); |
5350 | ||
5351 | #ifdef USE_GTK | |
a411ac43 | 5352 | xg_mark_data (); |
126f9c02 SM |
5353 | #endif |
5354 | ||
34400008 GM |
5355 | #if (GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS \ |
5356 | || GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS) | |
5357 | mark_stack (); | |
5358 | #else | |
acf5f7d3 SM |
5359 | { |
5360 | register struct gcpro *tail; | |
5361 | for (tail = gcprolist; tail; tail = tail->next) | |
5362 | for (i = 0; i < tail->nvars; i++) | |
005ca5c7 | 5363 | mark_object (tail->var[i]); |
acf5f7d3 | 5364 | } |
3e21b6a7 | 5365 | mark_byte_stack (); |
b286858c SM |
5366 | { |
5367 | struct catchtag *catch; | |
5368 | struct handler *handler; | |
177c0ea7 | 5369 | |
7146af97 JB |
5370 | for (catch = catchlist; catch; catch = catch->next) |
5371 | { | |
49723c04 SM |
5372 | mark_object (catch->tag); |
5373 | mark_object (catch->val); | |
177c0ea7 | 5374 | } |
7146af97 JB |
5375 | for (handler = handlerlist; handler; handler = handler->next) |
5376 | { | |
49723c04 SM |
5377 | mark_object (handler->handler); |
5378 | mark_object (handler->var); | |
177c0ea7 | 5379 | } |
b286858c | 5380 | } |
b286858c | 5381 | #endif |
7146af97 | 5382 | |
454d7973 KS |
5383 | #ifdef HAVE_WINDOW_SYSTEM |
5384 | mark_fringe_data (); | |
5385 | #endif | |
5386 | ||
74c35a48 SM |
5387 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
5388 | mark_stack (); | |
5389 | #endif | |
5390 | ||
c37adf23 SM |
5391 | /* Everything is now marked, except for the things that require special |
5392 | finalization, i.e. the undo_list. | |
5393 | Look thru every buffer's undo list | |
4c315bda RS |
5394 | for elements that update markers that were not marked, |
5395 | and delete them. */ | |
52b852c7 | 5396 | FOR_EACH_BUFFER (nextb) |
d17337e5 DA |
5397 | { |
5398 | /* If a buffer's undo list is Qt, that means that undo is | |
5399 | turned off in that buffer. Calling truncate_undo_list on | |
5400 | Qt tends to return NULL, which effectively turns undo back on. | |
5401 | So don't call truncate_undo_list if undo_list is Qt. */ | |
e34f7f79 | 5402 | if (! EQ (nextb->INTERNAL_FIELD (undo_list), Qt)) |
d17337e5 DA |
5403 | { |
5404 | Lisp_Object tail, prev; | |
e34f7f79 | 5405 | tail = nextb->INTERNAL_FIELD (undo_list); |
d17337e5 DA |
5406 | prev = Qnil; |
5407 | while (CONSP (tail)) | |
5408 | { | |
5409 | if (CONSP (XCAR (tail)) | |
5410 | && MARKERP (XCAR (XCAR (tail))) | |
5411 | && !XMARKER (XCAR (XCAR (tail)))->gcmarkbit) | |
5412 | { | |
5413 | if (NILP (prev)) | |
e34f7f79 | 5414 | nextb->INTERNAL_FIELD (undo_list) = tail = XCDR (tail); |
d17337e5 DA |
5415 | else |
5416 | { | |
5417 | tail = XCDR (tail); | |
5418 | XSETCDR (prev, tail); | |
5419 | } | |
5420 | } | |
5421 | else | |
5422 | { | |
5423 | prev = tail; | |
5424 | tail = XCDR (tail); | |
5425 | } | |
5426 | } | |
5427 | } | |
5428 | /* Now that we have stripped the elements that need not be in the | |
5429 | undo_list any more, we can finally mark the list. */ | |
e34f7f79 | 5430 | mark_object (nextb->INTERNAL_FIELD (undo_list)); |
d17337e5 | 5431 | } |
4c315bda | 5432 | |
7146af97 JB |
5433 | gc_sweep (); |
5434 | ||
5435 | /* Clear the mark bits that we set in certain root slots. */ | |
5436 | ||
033a5fa3 | 5437 | unmark_byte_stack (); |
3ef06d12 SM |
5438 | VECTOR_UNMARK (&buffer_defaults); |
5439 | VECTOR_UNMARK (&buffer_local_symbols); | |
7146af97 | 5440 | |
34400008 GM |
5441 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES && 0 |
5442 | dump_zombies (); | |
5443 | #endif | |
5444 | ||
7e63e0c3 | 5445 | check_cons_list (); |
bbc012e0 | 5446 | |
7146af97 JB |
5447 | gc_in_progress = 0; |
5448 | ||
5c747675 DA |
5449 | unblock_input (); |
5450 | ||
7146af97 | 5451 | consing_since_gc = 0; |
0dd6d66d DA |
5452 | if (gc_cons_threshold < GC_DEFAULT_THRESHOLD / 10) |
5453 | gc_cons_threshold = GC_DEFAULT_THRESHOLD / 10; | |
7146af97 | 5454 | |
c0c5c8ae | 5455 | gc_relative_threshold = 0; |
96f077ad SM |
5456 | if (FLOATP (Vgc_cons_percentage)) |
5457 | { /* Set gc_cons_combined_threshold. */ | |
12b3895d | 5458 | double tot = total_bytes_of_live_objects (); |
ae35e756 | 5459 | |
c0c5c8ae | 5460 | tot *= XFLOAT_DATA (Vgc_cons_percentage); |
7216e43b | 5461 | if (0 < tot) |
c0c5c8ae PE |
5462 | { |
5463 | if (tot < TYPE_MAXIMUM (EMACS_INT)) | |
5464 | gc_relative_threshold = tot; | |
5465 | else | |
5466 | gc_relative_threshold = TYPE_MAXIMUM (EMACS_INT); | |
5467 | } | |
96f077ad SM |
5468 | } |
5469 | ||
299585ee RS |
5470 | if (garbage_collection_messages) |
5471 | { | |
6efc7df7 GM |
5472 | if (message_p || minibuf_level > 0) |
5473 | restore_message (); | |
299585ee RS |
5474 | else |
5475 | message1_nolog ("Garbage collecting...done"); | |
5476 | } | |
7146af97 | 5477 | |
98edb5ff | 5478 | unbind_to (count, Qnil); |
fecbd8ff SM |
5479 | { |
5480 | Lisp_Object total[11]; | |
5481 | int total_size = 10; | |
2e471eb5 | 5482 | |
fecbd8ff SM |
5483 | total[0] = list4 (Qconses, make_number (sizeof (struct Lisp_Cons)), |
5484 | bounded_number (total_conses), | |
5485 | bounded_number (total_free_conses)); | |
3ab6e069 | 5486 | |
fecbd8ff SM |
5487 | total[1] = list4 (Qsymbols, make_number (sizeof (struct Lisp_Symbol)), |
5488 | bounded_number (total_symbols), | |
5489 | bounded_number (total_free_symbols)); | |
3ab6e069 | 5490 | |
fecbd8ff SM |
5491 | total[2] = list4 (Qmiscs, make_number (sizeof (union Lisp_Misc)), |
5492 | bounded_number (total_markers), | |
5493 | bounded_number (total_free_markers)); | |
3ab6e069 | 5494 | |
fecbd8ff SM |
5495 | total[3] = list4 (Qstrings, make_number (sizeof (struct Lisp_String)), |
5496 | bounded_number (total_strings), | |
5497 | bounded_number (total_free_strings)); | |
3ab6e069 | 5498 | |
fecbd8ff SM |
5499 | total[4] = list3 (Qstring_bytes, make_number (1), |
5500 | bounded_number (total_string_bytes)); | |
3ab6e069 | 5501 | |
fbe9e0b9 PE |
5502 | total[5] = list3 (Qvectors, |
5503 | make_number (header_size + sizeof (Lisp_Object)), | |
fecbd8ff | 5504 | bounded_number (total_vectors)); |
5b835e1d | 5505 | |
fecbd8ff SM |
5506 | total[6] = list4 (Qvector_slots, make_number (word_size), |
5507 | bounded_number (total_vector_slots), | |
5508 | bounded_number (total_free_vector_slots)); | |
5b835e1d | 5509 | |
fecbd8ff SM |
5510 | total[7] = list4 (Qfloats, make_number (sizeof (struct Lisp_Float)), |
5511 | bounded_number (total_floats), | |
5512 | bounded_number (total_free_floats)); | |
3ab6e069 | 5513 | |
fecbd8ff SM |
5514 | total[8] = list4 (Qintervals, make_number (sizeof (struct interval)), |
5515 | bounded_number (total_intervals), | |
5516 | bounded_number (total_free_intervals)); | |
3ab6e069 | 5517 | |
fecbd8ff SM |
5518 | total[9] = list3 (Qbuffers, make_number (sizeof (struct buffer)), |
5519 | bounded_number (total_buffers)); | |
2e471eb5 | 5520 | |
f8643a6b | 5521 | #ifdef DOUG_LEA_MALLOC |
fecbd8ff SM |
5522 | total_size++; |
5523 | total[10] = list4 (Qheap, make_number (1024), | |
5524 | bounded_number ((mallinfo ().uordblks + 1023) >> 10), | |
5525 | bounded_number ((mallinfo ().fordblks + 1023) >> 10)); | |
f8643a6b | 5526 | #endif |
fecbd8ff SM |
5527 | retval = Flist (total_size, total); |
5528 | } | |
f8643a6b | 5529 | |
34400008 | 5530 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES |
7146af97 | 5531 | { |
34400008 | 5532 | /* Compute average percentage of zombies. */ |
fecbd8ff SM |
5533 | double nlive |
5534 | = (total_conses + total_symbols + total_markers + total_strings | |
5535 | + total_vectors + total_floats + total_intervals + total_buffers); | |
34400008 GM |
5536 | |
5537 | avg_live = (avg_live * ngcs + nlive) / (ngcs + 1); | |
5538 | max_live = max (nlive, max_live); | |
5539 | avg_zombies = (avg_zombies * ngcs + nzombies) / (ngcs + 1); | |
5540 | max_zombies = max (nzombies, max_zombies); | |
5541 | ++ngcs; | |
dbcf001c | 5542 | } |
34400008 | 5543 | #endif |
7146af97 | 5544 | |
9e713715 GM |
5545 | if (!NILP (Vpost_gc_hook)) |
5546 | { | |
d311d28c | 5547 | ptrdiff_t gc_count = inhibit_garbage_collection (); |
9e713715 | 5548 | safe_run_hooks (Qpost_gc_hook); |
ae35e756 | 5549 | unbind_to (gc_count, Qnil); |
9e713715 | 5550 | } |
2c5bd608 DL |
5551 | |
5552 | /* Accumulate statistics. */ | |
2c5bd608 | 5553 | if (FLOATP (Vgc_elapsed)) |
387d4d92 | 5554 | { |
43aac990 | 5555 | struct timespec since_start = timespec_sub (current_timespec (), start); |
387d4d92 | 5556 | Vgc_elapsed = make_float (XFLOAT_DATA (Vgc_elapsed) |
43aac990 | 5557 | + timespectod (since_start)); |
387d4d92 | 5558 | } |
d35af63c | 5559 | |
2c5bd608 DL |
5560 | gcs_done++; |
5561 | ||
12b3895d | 5562 | /* Collect profiling data. */ |
6521894d | 5563 | if (profiler_memory_running) |
12b3895d TM |
5564 | { |
5565 | size_t swept = 0; | |
6521894d SM |
5566 | size_t tot_after = total_bytes_of_live_objects (); |
5567 | if (tot_before > tot_after) | |
5568 | swept = tot_before - tot_after; | |
3d80c99f | 5569 | malloc_probe (swept); |
12b3895d TM |
5570 | } |
5571 | ||
fecbd8ff | 5572 | return retval; |
7146af97 | 5573 | } |
34400008 | 5574 | |
41c28a37 | 5575 | |
3770920e GM |
5576 | /* Mark Lisp objects in glyph matrix MATRIX. Currently the |
5577 | only interesting objects referenced from glyphs are strings. */ | |
41c28a37 GM |
5578 | |
5579 | static void | |
971de7fb | 5580 | mark_glyph_matrix (struct glyph_matrix *matrix) |
41c28a37 GM |
5581 | { |
5582 | struct glyph_row *row = matrix->rows; | |
5583 | struct glyph_row *end = row + matrix->nrows; | |
5584 | ||
2e471eb5 GM |
5585 | for (; row < end; ++row) |
5586 | if (row->enabled_p) | |
5587 | { | |
5588 | int area; | |
5589 | for (area = LEFT_MARGIN_AREA; area < LAST_AREA; ++area) | |
5590 | { | |
5591 | struct glyph *glyph = row->glyphs[area]; | |
5592 | struct glyph *end_glyph = glyph + row->used[area]; | |
177c0ea7 | 5593 | |
2e471eb5 | 5594 | for (; glyph < end_glyph; ++glyph) |
8e50cc2d | 5595 | if (STRINGP (glyph->object) |
2e471eb5 | 5596 | && !STRING_MARKED_P (XSTRING (glyph->object))) |
49723c04 | 5597 | mark_object (glyph->object); |
2e471eb5 GM |
5598 | } |
5599 | } | |
41c28a37 GM |
5600 | } |
5601 | ||
34400008 | 5602 | |
41c28a37 GM |
5603 | /* Mark Lisp faces in the face cache C. */ |
5604 | ||
5605 | static void | |
971de7fb | 5606 | mark_face_cache (struct face_cache *c) |
41c28a37 GM |
5607 | { |
5608 | if (c) | |
5609 | { | |
5610 | int i, j; | |
5611 | for (i = 0; i < c->used; ++i) | |
5612 | { | |
5613 | struct face *face = FACE_FROM_ID (c->f, i); | |
5614 | ||
5615 | if (face) | |
5616 | { | |
5617 | for (j = 0; j < LFACE_VECTOR_SIZE; ++j) | |
49723c04 | 5618 | mark_object (face->lface[j]); |
41c28a37 GM |
5619 | } |
5620 | } | |
5621 | } | |
5622 | } | |
5623 | ||
5624 | ||
7146af97 | 5625 | \f |
1a4f1e2c | 5626 | /* Mark reference to a Lisp_Object. |
2e471eb5 GM |
5627 | If the object referred to has not been seen yet, recursively mark |
5628 | all the references contained in it. */ | |
7146af97 | 5629 | |
785cd37f | 5630 | #define LAST_MARKED_SIZE 500 |
d3d47262 | 5631 | static Lisp_Object last_marked[LAST_MARKED_SIZE]; |
244ed907 | 5632 | static int last_marked_index; |
785cd37f | 5633 | |
1342fc6f RS |
5634 | /* For debugging--call abort when we cdr down this many |
5635 | links of a list, in mark_object. In debugging, | |
5636 | the call to abort will hit a breakpoint. | |
5637 | Normally this is zero and the check never goes off. */ | |
903fe15d | 5638 | ptrdiff_t mark_object_loop_halt EXTERNALLY_VISIBLE; |
1342fc6f | 5639 | |
8f11f7ec | 5640 | static void |
971de7fb | 5641 | mark_vectorlike (struct Lisp_Vector *ptr) |
d2029e5b | 5642 | { |
d311d28c PE |
5643 | ptrdiff_t size = ptr->header.size; |
5644 | ptrdiff_t i; | |
d2029e5b | 5645 | |
8f11f7ec | 5646 | eassert (!VECTOR_MARKED_P (ptr)); |
7555c33f | 5647 | VECTOR_MARK (ptr); /* Else mark it. */ |
d2029e5b SM |
5648 | if (size & PSEUDOVECTOR_FLAG) |
5649 | size &= PSEUDOVECTOR_SIZE_MASK; | |
d3d47262 | 5650 | |
d2029e5b SM |
5651 | /* Note that this size is not the memory-footprint size, but only |
5652 | the number of Lisp_Object fields that we should trace. | |
5653 | The distinction is used e.g. by Lisp_Process which places extra | |
7555c33f SM |
5654 | non-Lisp_Object fields at the end of the structure... */ |
5655 | for (i = 0; i < size; i++) /* ...and then mark its elements. */ | |
d2029e5b | 5656 | mark_object (ptr->contents[i]); |
d2029e5b SM |
5657 | } |
5658 | ||
58026347 KH |
5659 | /* Like mark_vectorlike but optimized for char-tables (and |
5660 | sub-char-tables) assuming that the contents are mostly integers or | |
5661 | symbols. */ | |
5662 | ||
5663 | static void | |
971de7fb | 5664 | mark_char_table (struct Lisp_Vector *ptr) |
58026347 | 5665 | { |
b6439961 PE |
5666 | int size = ptr->header.size & PSEUDOVECTOR_SIZE_MASK; |
5667 | int i; | |
58026347 | 5668 | |
8f11f7ec | 5669 | eassert (!VECTOR_MARKED_P (ptr)); |
58026347 KH |
5670 | VECTOR_MARK (ptr); |
5671 | for (i = 0; i < size; i++) | |
5672 | { | |
5673 | Lisp_Object val = ptr->contents[i]; | |
5674 | ||
ef1b0ba7 | 5675 | if (INTEGERP (val) || (SYMBOLP (val) && XSYMBOL (val)->gcmarkbit)) |
58026347 KH |
5676 | continue; |
5677 | if (SUB_CHAR_TABLE_P (val)) | |
5678 | { | |
5679 | if (! VECTOR_MARKED_P (XVECTOR (val))) | |
5680 | mark_char_table (XVECTOR (val)); | |
5681 | } | |
5682 | else | |
5683 | mark_object (val); | |
5684 | } | |
5685 | } | |
5686 | ||
36429c89 DA |
5687 | /* Mark the chain of overlays starting at PTR. */ |
5688 | ||
5689 | static void | |
5690 | mark_overlay (struct Lisp_Overlay *ptr) | |
5691 | { | |
5692 | for (; ptr && !ptr->gcmarkbit; ptr = ptr->next) | |
5693 | { | |
5694 | ptr->gcmarkbit = 1; | |
c644523b DA |
5695 | mark_object (ptr->start); |
5696 | mark_object (ptr->end); | |
5697 | mark_object (ptr->plist); | |
36429c89 DA |
5698 | } |
5699 | } | |
5700 | ||
5701 | /* Mark Lisp_Objects and special pointers in BUFFER. */ | |
cf5c0175 DA |
5702 | |
5703 | static void | |
5704 | mark_buffer (struct buffer *buffer) | |
5705 | { | |
b4fa72f2 DA |
5706 | /* This is handled much like other pseudovectors... */ |
5707 | mark_vectorlike ((struct Lisp_Vector *) buffer); | |
cf5c0175 | 5708 | |
b4fa72f2 | 5709 | /* ...but there are some buffer-specific things. */ |
cf5c0175 | 5710 | |
b4fa72f2 | 5711 | MARK_INTERVAL_TREE (buffer_intervals (buffer)); |
cf5c0175 | 5712 | |
b4fa72f2 DA |
5713 | /* For now, we just don't mark the undo_list. It's done later in |
5714 | a special way just before the sweep phase, and after stripping | |
5715 | some of its elements that are not needed any more. */ | |
cf5c0175 | 5716 | |
b4fa72f2 DA |
5717 | mark_overlay (buffer->overlays_before); |
5718 | mark_overlay (buffer->overlays_after); | |
cf5c0175 | 5719 | |
b4fa72f2 DA |
5720 | /* If this is an indirect buffer, mark its base buffer. */ |
5721 | if (buffer->base_buffer && !VECTOR_MARKED_P (buffer->base_buffer)) | |
5722 | mark_buffer (buffer->base_buffer); | |
cf5c0175 DA |
5723 | } |
5724 | ||
d59a1afb | 5725 | /* Remove killed buffers or items whose car is a killed buffer from |
e99f70c8 | 5726 | LIST, and mark other items. Return changed LIST, which is marked. */ |
d73e321c | 5727 | |
5779a1dc | 5728 | static Lisp_Object |
d59a1afb | 5729 | mark_discard_killed_buffers (Lisp_Object list) |
d73e321c | 5730 | { |
d59a1afb | 5731 | Lisp_Object tail, *prev = &list; |
d73e321c | 5732 | |
d59a1afb DA |
5733 | for (tail = list; CONSP (tail) && !CONS_MARKED_P (XCONS (tail)); |
5734 | tail = XCDR (tail)) | |
d73e321c | 5735 | { |
5779a1dc | 5736 | Lisp_Object tem = XCAR (tail); |
d73e321c DA |
5737 | if (CONSP (tem)) |
5738 | tem = XCAR (tem); | |
5739 | if (BUFFERP (tem) && !BUFFER_LIVE_P (XBUFFER (tem))) | |
5779a1dc | 5740 | *prev = XCDR (tail); |
d73e321c | 5741 | else |
d59a1afb DA |
5742 | { |
5743 | CONS_MARK (XCONS (tail)); | |
5744 | mark_object (XCAR (tail)); | |
84575e67 | 5745 | prev = xcdr_addr (tail); |
d59a1afb | 5746 | } |
d73e321c | 5747 | } |
e99f70c8 | 5748 | mark_object (tail); |
d73e321c DA |
5749 | return list; |
5750 | } | |
5751 | ||
cf5c0175 DA |
5752 | /* Determine type of generic Lisp_Object and mark it accordingly. */ |
5753 | ||
41c28a37 | 5754 | void |
971de7fb | 5755 | mark_object (Lisp_Object arg) |
7146af97 | 5756 | { |
49723c04 | 5757 | register Lisp_Object obj = arg; |
4f5c1376 GM |
5758 | #ifdef GC_CHECK_MARKED_OBJECTS |
5759 | void *po; | |
5760 | struct mem_node *m; | |
5761 | #endif | |
903fe15d | 5762 | ptrdiff_t cdr_count = 0; |
7146af97 | 5763 | |
9149e743 | 5764 | loop: |
7146af97 | 5765 | |
1f0b3fd2 | 5766 | if (PURE_POINTER_P (XPNTR (obj))) |
7146af97 JB |
5767 | return; |
5768 | ||
49723c04 | 5769 | last_marked[last_marked_index++] = obj; |
785cd37f RS |
5770 | if (last_marked_index == LAST_MARKED_SIZE) |
5771 | last_marked_index = 0; | |
5772 | ||
4f5c1376 GM |
5773 | /* Perform some sanity checks on the objects marked here. Abort if |
5774 | we encounter an object we know is bogus. This increases GC time | |
5775 | by ~80%, and requires compilation with GC_MARK_STACK != 0. */ | |
5776 | #ifdef GC_CHECK_MARKED_OBJECTS | |
5777 | ||
5778 | po = (void *) XPNTR (obj); | |
5779 | ||
5780 | /* Check that the object pointed to by PO is known to be a Lisp | |
5781 | structure allocated from the heap. */ | |
5782 | #define CHECK_ALLOCATED() \ | |
5783 | do { \ | |
5784 | m = mem_find (po); \ | |
5785 | if (m == MEM_NIL) \ | |
1088b922 | 5786 | emacs_abort (); \ |
4f5c1376 GM |
5787 | } while (0) |
5788 | ||
5789 | /* Check that the object pointed to by PO is live, using predicate | |
5790 | function LIVEP. */ | |
5791 | #define CHECK_LIVE(LIVEP) \ | |
5792 | do { \ | |
5793 | if (!LIVEP (m, po)) \ | |
1088b922 | 5794 | emacs_abort (); \ |
4f5c1376 GM |
5795 | } while (0) |
5796 | ||
5797 | /* Check both of the above conditions. */ | |
5798 | #define CHECK_ALLOCATED_AND_LIVE(LIVEP) \ | |
5799 | do { \ | |
5800 | CHECK_ALLOCATED (); \ | |
5801 | CHECK_LIVE (LIVEP); \ | |
5802 | } while (0) \ | |
177c0ea7 | 5803 | |
4f5c1376 | 5804 | #else /* not GC_CHECK_MARKED_OBJECTS */ |
177c0ea7 | 5805 | |
4f5c1376 GM |
5806 | #define CHECK_LIVE(LIVEP) (void) 0 |
5807 | #define CHECK_ALLOCATED_AND_LIVE(LIVEP) (void) 0 | |
177c0ea7 | 5808 | |
4f5c1376 GM |
5809 | #endif /* not GC_CHECK_MARKED_OBJECTS */ |
5810 | ||
7393bcbb | 5811 | switch (XTYPE (obj)) |
7146af97 JB |
5812 | { |
5813 | case Lisp_String: | |
5814 | { | |
5815 | register struct Lisp_String *ptr = XSTRING (obj); | |
8f11f7ec SM |
5816 | if (STRING_MARKED_P (ptr)) |
5817 | break; | |
4f5c1376 | 5818 | CHECK_ALLOCATED_AND_LIVE (live_string_p); |
2e471eb5 | 5819 | MARK_STRING (ptr); |
7555c33f | 5820 | MARK_INTERVAL_TREE (ptr->intervals); |
361b097f | 5821 | #ifdef GC_CHECK_STRING_BYTES |
676a7251 | 5822 | /* Check that the string size recorded in the string is the |
7555c33f | 5823 | same as the one recorded in the sdata structure. */ |
e499d0ee | 5824 | string_bytes (ptr); |
361b097f | 5825 | #endif /* GC_CHECK_STRING_BYTES */ |
7146af97 JB |
5826 | } |
5827 | break; | |
5828 | ||
76437631 | 5829 | case Lisp_Vectorlike: |
cf5c0175 DA |
5830 | { |
5831 | register struct Lisp_Vector *ptr = XVECTOR (obj); | |
5832 | register ptrdiff_t pvectype; | |
5833 | ||
5834 | if (VECTOR_MARKED_P (ptr)) | |
5835 | break; | |
5836 | ||
4f5c1376 | 5837 | #ifdef GC_CHECK_MARKED_OBJECTS |
cf5c0175 | 5838 | m = mem_find (po); |
c752cfa9 | 5839 | if (m == MEM_NIL && !SUBRP (obj)) |
1088b922 | 5840 | emacs_abort (); |
4f5c1376 | 5841 | #endif /* GC_CHECK_MARKED_OBJECTS */ |
177c0ea7 | 5842 | |
cf5c0175 | 5843 | if (ptr->header.size & PSEUDOVECTOR_FLAG) |
ee28be33 | 5844 | pvectype = ((ptr->header.size & PVEC_TYPE_MASK) |
914adc42 | 5845 | >> PSEUDOVECTOR_AREA_BITS); |
cf5c0175 | 5846 | else |
6aea7528 | 5847 | pvectype = PVEC_NORMAL_VECTOR; |
cf5c0175 | 5848 | |
cf5c0175 DA |
5849 | if (pvectype != PVEC_SUBR && pvectype != PVEC_BUFFER) |
5850 | CHECK_LIVE (live_vector_p); | |
169ee243 | 5851 | |
ee28be33 | 5852 | switch (pvectype) |
cf5c0175 | 5853 | { |
ee28be33 | 5854 | case PVEC_BUFFER: |
cf5c0175 | 5855 | #ifdef GC_CHECK_MARKED_OBJECTS |
c752cfa9 DA |
5856 | { |
5857 | struct buffer *b; | |
5858 | FOR_EACH_BUFFER (b) | |
5859 | if (b == po) | |
5860 | break; | |
5861 | if (b == NULL) | |
5862 | emacs_abort (); | |
5863 | } | |
cf5c0175 DA |
5864 | #endif /* GC_CHECK_MARKED_OBJECTS */ |
5865 | mark_buffer ((struct buffer *) ptr); | |
ee28be33 SM |
5866 | break; |
5867 | ||
5868 | case PVEC_COMPILED: | |
5869 | { /* We could treat this just like a vector, but it is better | |
5870 | to save the COMPILED_CONSTANTS element for last and avoid | |
5871 | recursion there. */ | |
5872 | int size = ptr->header.size & PSEUDOVECTOR_SIZE_MASK; | |
5873 | int i; | |
5874 | ||
5875 | VECTOR_MARK (ptr); | |
5876 | for (i = 0; i < size; i++) | |
5877 | if (i != COMPILED_CONSTANTS) | |
5878 | mark_object (ptr->contents[i]); | |
5879 | if (size > COMPILED_CONSTANTS) | |
5880 | { | |
5881 | obj = ptr->contents[COMPILED_CONSTANTS]; | |
5882 | goto loop; | |
5883 | } | |
5884 | } | |
5885 | break; | |
cf5c0175 | 5886 | |
ee28be33 | 5887 | case PVEC_FRAME: |
d59a1afb DA |
5888 | mark_vectorlike (ptr); |
5889 | mark_face_cache (((struct frame *) ptr)->face_cache); | |
ee28be33 | 5890 | break; |
cf5c0175 | 5891 | |
ee28be33 SM |
5892 | case PVEC_WINDOW: |
5893 | { | |
5894 | struct window *w = (struct window *) ptr; | |
5779a1dc | 5895 | |
0699fc18 | 5896 | mark_vectorlike (ptr); |
e99f70c8 | 5897 | |
e74aeda8 | 5898 | /* Mark glyph matrices, if any. Marking window |
0699fc18 DA |
5899 | matrices is sufficient because frame matrices |
5900 | use the same glyph memory. */ | |
e74aeda8 | 5901 | if (w->current_matrix) |
ee28be33 | 5902 | { |
0699fc18 DA |
5903 | mark_glyph_matrix (w->current_matrix); |
5904 | mark_glyph_matrix (w->desired_matrix); | |
ee28be33 | 5905 | } |
e99f70c8 SM |
5906 | |
5907 | /* Filter out killed buffers from both buffer lists | |
5908 | in attempt to help GC to reclaim killed buffers faster. | |
5909 | We can do it elsewhere for live windows, but this is the | |
5910 | best place to do it for dead windows. */ | |
5911 | wset_prev_buffers | |
5912 | (w, mark_discard_killed_buffers (w->prev_buffers)); | |
5913 | wset_next_buffers | |
5914 | (w, mark_discard_killed_buffers (w->next_buffers)); | |
ee28be33 SM |
5915 | } |
5916 | break; | |
cf5c0175 | 5917 | |
ee28be33 SM |
5918 | case PVEC_HASH_TABLE: |
5919 | { | |
5920 | struct Lisp_Hash_Table *h = (struct Lisp_Hash_Table *) ptr; | |
cf5c0175 | 5921 | |
ee28be33 | 5922 | mark_vectorlike (ptr); |
b7432bb2 SM |
5923 | mark_object (h->test.name); |
5924 | mark_object (h->test.user_hash_function); | |
5925 | mark_object (h->test.user_cmp_function); | |
ee28be33 SM |
5926 | /* If hash table is not weak, mark all keys and values. |
5927 | For weak tables, mark only the vector. */ | |
5928 | if (NILP (h->weak)) | |
5929 | mark_object (h->key_and_value); | |
5930 | else | |
5931 | VECTOR_MARK (XVECTOR (h->key_and_value)); | |
5932 | } | |
5933 | break; | |
cf5c0175 | 5934 | |
ee28be33 SM |
5935 | case PVEC_CHAR_TABLE: |
5936 | mark_char_table (ptr); | |
5937 | break; | |
cf5c0175 | 5938 | |
ee28be33 SM |
5939 | case PVEC_BOOL_VECTOR: |
5940 | /* No Lisp_Objects to mark in a bool vector. */ | |
5941 | VECTOR_MARK (ptr); | |
5942 | break; | |
cf5c0175 | 5943 | |
ee28be33 SM |
5944 | case PVEC_SUBR: |
5945 | break; | |
cf5c0175 | 5946 | |
ee28be33 | 5947 | case PVEC_FREE: |
1088b922 | 5948 | emacs_abort (); |
cf5c0175 | 5949 | |
ee28be33 SM |
5950 | default: |
5951 | mark_vectorlike (ptr); | |
5952 | } | |
cf5c0175 | 5953 | } |
169ee243 | 5954 | break; |
7146af97 | 5955 | |
7146af97 JB |
5956 | case Lisp_Symbol: |
5957 | { | |
c70bbf06 | 5958 | register struct Lisp_Symbol *ptr = XSYMBOL (obj); |
7146af97 JB |
5959 | struct Lisp_Symbol *ptrx; |
5960 | ||
8f11f7ec SM |
5961 | if (ptr->gcmarkbit) |
5962 | break; | |
4f5c1376 | 5963 | CHECK_ALLOCATED_AND_LIVE (live_symbol_p); |
2336fe58 | 5964 | ptr->gcmarkbit = 1; |
c644523b DA |
5965 | mark_object (ptr->function); |
5966 | mark_object (ptr->plist); | |
ce5b453a SM |
5967 | switch (ptr->redirect) |
5968 | { | |
5969 | case SYMBOL_PLAINVAL: mark_object (SYMBOL_VAL (ptr)); break; | |
5970 | case SYMBOL_VARALIAS: | |
5971 | { | |
5972 | Lisp_Object tem; | |
5973 | XSETSYMBOL (tem, SYMBOL_ALIAS (ptr)); | |
5974 | mark_object (tem); | |
5975 | break; | |
5976 | } | |
5977 | case SYMBOL_LOCALIZED: | |
5978 | { | |
5979 | struct Lisp_Buffer_Local_Value *blv = SYMBOL_BLV (ptr); | |
d73e321c DA |
5980 | Lisp_Object where = blv->where; |
5981 | /* If the value is set up for a killed buffer or deleted | |
5982 | frame, restore it's global binding. If the value is | |
5983 | forwarded to a C variable, either it's not a Lisp_Object | |
5984 | var, or it's staticpro'd already. */ | |
5985 | if ((BUFFERP (where) && !BUFFER_LIVE_P (XBUFFER (where))) | |
5986 | || (FRAMEP (where) && !FRAME_LIVE_P (XFRAME (where)))) | |
5987 | swap_in_global_binding (ptr); | |
ce5b453a SM |
5988 | mark_object (blv->where); |
5989 | mark_object (blv->valcell); | |
5990 | mark_object (blv->defcell); | |
5991 | break; | |
5992 | } | |
5993 | case SYMBOL_FORWARDED: | |
5994 | /* If the value is forwarded to a buffer or keyboard field, | |
5995 | these are marked when we see the corresponding object. | |
5996 | And if it's forwarded to a C variable, either it's not | |
5997 | a Lisp_Object var, or it's staticpro'd already. */ | |
5998 | break; | |
1088b922 | 5999 | default: emacs_abort (); |
ce5b453a | 6000 | } |
c644523b DA |
6001 | if (!PURE_POINTER_P (XSTRING (ptr->name))) |
6002 | MARK_STRING (XSTRING (ptr->name)); | |
0c94c8d6 | 6003 | MARK_INTERVAL_TREE (string_intervals (ptr->name)); |
177c0ea7 | 6004 | |
7146af97 JB |
6005 | ptr = ptr->next; |
6006 | if (ptr) | |
6007 | { | |
7555c33f | 6008 | ptrx = ptr; /* Use of ptrx avoids compiler bug on Sun. */ |
7146af97 | 6009 | XSETSYMBOL (obj, ptrx); |
49723c04 | 6010 | goto loop; |
7146af97 JB |
6011 | } |
6012 | } | |
6013 | break; | |
6014 | ||
a0a38eb7 | 6015 | case Lisp_Misc: |
4f5c1376 | 6016 | CHECK_ALLOCATED_AND_LIVE (live_misc_p); |
b766f870 | 6017 | |
7555c33f SM |
6018 | if (XMISCANY (obj)->gcmarkbit) |
6019 | break; | |
6020 | ||
6021 | switch (XMISCTYPE (obj)) | |
a0a38eb7 | 6022 | { |
7555c33f SM |
6023 | case Lisp_Misc_Marker: |
6024 | /* DO NOT mark thru the marker's chain. | |
6025 | The buffer's markers chain does not preserve markers from gc; | |
6026 | instead, markers are removed from the chain when freed by gc. */ | |
36429c89 | 6027 | XMISCANY (obj)->gcmarkbit = 1; |
7555c33f | 6028 | break; |
465edf35 | 6029 | |
7555c33f SM |
6030 | case Lisp_Misc_Save_Value: |
6031 | XMISCANY (obj)->gcmarkbit = 1; | |
7555c33f | 6032 | { |
7b1123d8 PE |
6033 | struct Lisp_Save_Value *ptr = XSAVE_VALUE (obj); |
6034 | /* If `save_type' is zero, `data[0].pointer' is the address | |
73ebd38f DA |
6035 | of a memory area containing `data[1].integer' potential |
6036 | Lisp_Objects. */ | |
7b1123d8 | 6037 | if (GC_MARK_STACK && ptr->save_type == SAVE_TYPE_MEMORY) |
7555c33f | 6038 | { |
c50cf2ea | 6039 | Lisp_Object *p = ptr->data[0].pointer; |
7555c33f | 6040 | ptrdiff_t nelt; |
73ebd38f | 6041 | for (nelt = ptr->data[1].integer; nelt > 0; nelt--, p++) |
7555c33f SM |
6042 | mark_maybe_object (*p); |
6043 | } | |
73ebd38f | 6044 | else |
73ebd38f DA |
6045 | { |
6046 | /* Find Lisp_Objects in `data[N]' slots and mark them. */ | |
7b1123d8 PE |
6047 | int i; |
6048 | for (i = 0; i < SAVE_VALUE_SLOTS; i++) | |
6049 | if (save_type (ptr, i) == SAVE_OBJECT) | |
6050 | mark_object (ptr->data[i].object); | |
73ebd38f | 6051 | } |
7555c33f | 6052 | } |
7555c33f SM |
6053 | break; |
6054 | ||
6055 | case Lisp_Misc_Overlay: | |
6056 | mark_overlay (XOVERLAY (obj)); | |
6057 | break; | |
6058 | ||
6059 | default: | |
1088b922 | 6060 | emacs_abort (); |
a0a38eb7 | 6061 | } |
7146af97 JB |
6062 | break; |
6063 | ||
6064 | case Lisp_Cons: | |
7146af97 JB |
6065 | { |
6066 | register struct Lisp_Cons *ptr = XCONS (obj); | |
8f11f7ec SM |
6067 | if (CONS_MARKED_P (ptr)) |
6068 | break; | |
4f5c1376 | 6069 | CHECK_ALLOCATED_AND_LIVE (live_cons_p); |
08b7c2cb | 6070 | CONS_MARK (ptr); |
c54ca951 | 6071 | /* If the cdr is nil, avoid recursion for the car. */ |
c644523b | 6072 | if (EQ (ptr->u.cdr, Qnil)) |
c54ca951 | 6073 | { |
c644523b | 6074 | obj = ptr->car; |
1342fc6f | 6075 | cdr_count = 0; |
c54ca951 RS |
6076 | goto loop; |
6077 | } | |
c644523b DA |
6078 | mark_object (ptr->car); |
6079 | obj = ptr->u.cdr; | |
1342fc6f RS |
6080 | cdr_count++; |
6081 | if (cdr_count == mark_object_loop_halt) | |
1088b922 | 6082 | emacs_abort (); |
7146af97 JB |
6083 | goto loop; |
6084 | } | |
6085 | ||
7146af97 | 6086 | case Lisp_Float: |
4f5c1376 | 6087 | CHECK_ALLOCATED_AND_LIVE (live_float_p); |
ab6780cd | 6088 | FLOAT_MARK (XFLOAT (obj)); |
7146af97 | 6089 | break; |
7146af97 | 6090 | |
2de9f71c | 6091 | case_Lisp_Int: |
7146af97 JB |
6092 | break; |
6093 | ||
6094 | default: | |
1088b922 | 6095 | emacs_abort (); |
7146af97 | 6096 | } |
4f5c1376 GM |
6097 | |
6098 | #undef CHECK_LIVE | |
6099 | #undef CHECK_ALLOCATED | |
6100 | #undef CHECK_ALLOCATED_AND_LIVE | |
7146af97 | 6101 | } |
4a729fd8 | 6102 | /* Mark the Lisp pointers in the terminal objects. |
0ba2624f | 6103 | Called by Fgarbage_collect. */ |
4a729fd8 | 6104 | |
4a729fd8 SM |
6105 | static void |
6106 | mark_terminals (void) | |
6107 | { | |
6108 | struct terminal *t; | |
6109 | for (t = terminal_list; t; t = t->next_terminal) | |
6110 | { | |
6111 | eassert (t->name != NULL); | |
354884c4 | 6112 | #ifdef HAVE_WINDOW_SYSTEM |
96ad0af7 YM |
6113 | /* If a terminal object is reachable from a stacpro'ed object, |
6114 | it might have been marked already. Make sure the image cache | |
6115 | gets marked. */ | |
6116 | mark_image_cache (t->image_cache); | |
354884c4 | 6117 | #endif /* HAVE_WINDOW_SYSTEM */ |
96ad0af7 YM |
6118 | if (!VECTOR_MARKED_P (t)) |
6119 | mark_vectorlike ((struct Lisp_Vector *)t); | |
4a729fd8 SM |
6120 | } |
6121 | } | |
6122 | ||
6123 | ||
084b1a0c | 6124 | |
41c28a37 GM |
6125 | /* Value is non-zero if OBJ will survive the current GC because it's |
6126 | either marked or does not need to be marked to survive. */ | |
6127 | ||
fce31d69 | 6128 | bool |
971de7fb | 6129 | survives_gc_p (Lisp_Object obj) |
41c28a37 | 6130 | { |
fce31d69 | 6131 | bool survives_p; |
177c0ea7 | 6132 | |
8e50cc2d | 6133 | switch (XTYPE (obj)) |
41c28a37 | 6134 | { |
2de9f71c | 6135 | case_Lisp_Int: |
41c28a37 GM |
6136 | survives_p = 1; |
6137 | break; | |
6138 | ||
6139 | case Lisp_Symbol: | |
2336fe58 | 6140 | survives_p = XSYMBOL (obj)->gcmarkbit; |
41c28a37 GM |
6141 | break; |
6142 | ||
6143 | case Lisp_Misc: | |
67ee9f6e | 6144 | survives_p = XMISCANY (obj)->gcmarkbit; |
41c28a37 GM |
6145 | break; |
6146 | ||
6147 | case Lisp_String: | |
08b7c2cb | 6148 | survives_p = STRING_MARKED_P (XSTRING (obj)); |
41c28a37 GM |
6149 | break; |
6150 | ||
6151 | case Lisp_Vectorlike: | |
8e50cc2d | 6152 | survives_p = SUBRP (obj) || VECTOR_MARKED_P (XVECTOR (obj)); |
41c28a37 GM |
6153 | break; |
6154 | ||
6155 | case Lisp_Cons: | |
08b7c2cb | 6156 | survives_p = CONS_MARKED_P (XCONS (obj)); |
41c28a37 GM |
6157 | break; |
6158 | ||
41c28a37 | 6159 | case Lisp_Float: |
ab6780cd | 6160 | survives_p = FLOAT_MARKED_P (XFLOAT (obj)); |
41c28a37 | 6161 | break; |
41c28a37 GM |
6162 | |
6163 | default: | |
1088b922 | 6164 | emacs_abort (); |
41c28a37 GM |
6165 | } |
6166 | ||
34400008 | 6167 | return survives_p || PURE_POINTER_P ((void *) XPNTR (obj)); |
41c28a37 GM |
6168 | } |
6169 | ||
6170 | ||
7146af97 | 6171 | \f |
1a4f1e2c | 6172 | /* Sweep: find all structures not marked, and free them. */ |
7146af97 JB |
6173 | |
6174 | static void | |
971de7fb | 6175 | gc_sweep (void) |
7146af97 | 6176 | { |
41c28a37 GM |
6177 | /* Remove or mark entries in weak hash tables. |
6178 | This must be done before any object is unmarked. */ | |
6179 | sweep_weak_hash_tables (); | |
6180 | ||
2e471eb5 | 6181 | sweep_strings (); |
e499d0ee | 6182 | check_string_bytes (!noninteractive); |
7146af97 JB |
6183 | |
6184 | /* Put all unmarked conses on free list */ | |
6185 | { | |
6186 | register struct cons_block *cblk; | |
6ca94ac9 | 6187 | struct cons_block **cprev = &cons_block; |
7146af97 | 6188 | register int lim = cons_block_index; |
c0c5c8ae | 6189 | EMACS_INT num_free = 0, num_used = 0; |
7146af97 JB |
6190 | |
6191 | cons_free_list = 0; | |
177c0ea7 | 6192 | |
6ca94ac9 | 6193 | for (cblk = cons_block; cblk; cblk = *cprev) |
7146af97 | 6194 | { |
3ae2e3a3 | 6195 | register int i = 0; |
6ca94ac9 | 6196 | int this_free = 0; |
3ae2e3a3 RS |
6197 | int ilim = (lim + BITS_PER_INT - 1) / BITS_PER_INT; |
6198 | ||
6199 | /* Scan the mark bits an int at a time. */ | |
47ea7f44 | 6200 | for (i = 0; i < ilim; i++) |
3ae2e3a3 RS |
6201 | { |
6202 | if (cblk->gcmarkbits[i] == -1) | |
6203 | { | |
6204 | /* Fast path - all cons cells for this int are marked. */ | |
6205 | cblk->gcmarkbits[i] = 0; | |
6206 | num_used += BITS_PER_INT; | |
6207 | } | |
6208 | else | |
6209 | { | |
6210 | /* Some cons cells for this int are not marked. | |
6211 | Find which ones, and free them. */ | |
6212 | int start, pos, stop; | |
6213 | ||
6214 | start = i * BITS_PER_INT; | |
6215 | stop = lim - start; | |
6216 | if (stop > BITS_PER_INT) | |
6217 | stop = BITS_PER_INT; | |
6218 | stop += start; | |
6219 | ||
6220 | for (pos = start; pos < stop; pos++) | |
6221 | { | |
6222 | if (!CONS_MARKED_P (&cblk->conses[pos])) | |
6223 | { | |
6224 | this_free++; | |
6225 | cblk->conses[pos].u.chain = cons_free_list; | |
6226 | cons_free_list = &cblk->conses[pos]; | |
34400008 | 6227 | #if GC_MARK_STACK |
c644523b | 6228 | cons_free_list->car = Vdead; |
34400008 | 6229 | #endif |
3ae2e3a3 RS |
6230 | } |
6231 | else | |
6232 | { | |
6233 | num_used++; | |
6234 | CONS_UNMARK (&cblk->conses[pos]); | |
6235 | } | |
6236 | } | |
6237 | } | |
6238 | } | |
6239 | ||
7146af97 | 6240 | lim = CONS_BLOCK_SIZE; |
6ca94ac9 KH |
6241 | /* If this block contains only free conses and we have already |
6242 | seen more than two blocks worth of free conses then deallocate | |
6243 | this block. */ | |
6feef451 | 6244 | if (this_free == CONS_BLOCK_SIZE && num_free > CONS_BLOCK_SIZE) |
6ca94ac9 | 6245 | { |
6ca94ac9 KH |
6246 | *cprev = cblk->next; |
6247 | /* Unhook from the free list. */ | |
28a099a4 | 6248 | cons_free_list = cblk->conses[0].u.chain; |
08b7c2cb | 6249 | lisp_align_free (cblk); |
6ca94ac9 KH |
6250 | } |
6251 | else | |
6feef451 AS |
6252 | { |
6253 | num_free += this_free; | |
6254 | cprev = &cblk->next; | |
6255 | } | |
7146af97 JB |
6256 | } |
6257 | total_conses = num_used; | |
6258 | total_free_conses = num_free; | |
6259 | } | |
6260 | ||
7146af97 JB |
6261 | /* Put all unmarked floats on free list */ |
6262 | { | |
6263 | register struct float_block *fblk; | |
6ca94ac9 | 6264 | struct float_block **fprev = &float_block; |
7146af97 | 6265 | register int lim = float_block_index; |
c0c5c8ae | 6266 | EMACS_INT num_free = 0, num_used = 0; |
7146af97 JB |
6267 | |
6268 | float_free_list = 0; | |
177c0ea7 | 6269 | |
6ca94ac9 | 6270 | for (fblk = float_block; fblk; fblk = *fprev) |
7146af97 JB |
6271 | { |
6272 | register int i; | |
6ca94ac9 | 6273 | int this_free = 0; |
7146af97 | 6274 | for (i = 0; i < lim; i++) |
ab6780cd | 6275 | if (!FLOAT_MARKED_P (&fblk->floats[i])) |
7146af97 | 6276 | { |
6ca94ac9 | 6277 | this_free++; |
28a099a4 | 6278 | fblk->floats[i].u.chain = float_free_list; |
7146af97 JB |
6279 | float_free_list = &fblk->floats[i]; |
6280 | } | |
6281 | else | |
6282 | { | |
6283 | num_used++; | |
ab6780cd | 6284 | FLOAT_UNMARK (&fblk->floats[i]); |
7146af97 JB |
6285 | } |
6286 | lim = FLOAT_BLOCK_SIZE; | |
6ca94ac9 KH |
6287 | /* If this block contains only free floats and we have already |
6288 | seen more than two blocks worth of free floats then deallocate | |
6289 | this block. */ | |
6feef451 | 6290 | if (this_free == FLOAT_BLOCK_SIZE && num_free > FLOAT_BLOCK_SIZE) |
6ca94ac9 | 6291 | { |
6ca94ac9 KH |
6292 | *fprev = fblk->next; |
6293 | /* Unhook from the free list. */ | |
28a099a4 | 6294 | float_free_list = fblk->floats[0].u.chain; |
ab6780cd | 6295 | lisp_align_free (fblk); |
6ca94ac9 KH |
6296 | } |
6297 | else | |
6feef451 AS |
6298 | { |
6299 | num_free += this_free; | |
6300 | fprev = &fblk->next; | |
6301 | } | |
7146af97 JB |
6302 | } |
6303 | total_floats = num_used; | |
6304 | total_free_floats = num_free; | |
6305 | } | |
7146af97 | 6306 | |
d5e35230 JA |
6307 | /* Put all unmarked intervals on free list */ |
6308 | { | |
6309 | register struct interval_block *iblk; | |
6ca94ac9 | 6310 | struct interval_block **iprev = &interval_block; |
d5e35230 | 6311 | register int lim = interval_block_index; |
c0c5c8ae | 6312 | EMACS_INT num_free = 0, num_used = 0; |
d5e35230 JA |
6313 | |
6314 | interval_free_list = 0; | |
6315 | ||
6ca94ac9 | 6316 | for (iblk = interval_block; iblk; iblk = *iprev) |
d5e35230 JA |
6317 | { |
6318 | register int i; | |
6ca94ac9 | 6319 | int this_free = 0; |
d5e35230 JA |
6320 | |
6321 | for (i = 0; i < lim; i++) | |
6322 | { | |
2336fe58 | 6323 | if (!iblk->intervals[i].gcmarkbit) |
d5e35230 | 6324 | { |
0c94c8d6 | 6325 | set_interval_parent (&iblk->intervals[i], interval_free_list); |
d5e35230 | 6326 | interval_free_list = &iblk->intervals[i]; |
6ca94ac9 | 6327 | this_free++; |
d5e35230 JA |
6328 | } |
6329 | else | |
6330 | { | |
6331 | num_used++; | |
2336fe58 | 6332 | iblk->intervals[i].gcmarkbit = 0; |
d5e35230 JA |
6333 | } |
6334 | } | |
6335 | lim = INTERVAL_BLOCK_SIZE; | |
6ca94ac9 KH |
6336 | /* If this block contains only free intervals and we have already |
6337 | seen more than two blocks worth of free intervals then | |
6338 | deallocate this block. */ | |
6feef451 | 6339 | if (this_free == INTERVAL_BLOCK_SIZE && num_free > INTERVAL_BLOCK_SIZE) |
6ca94ac9 | 6340 | { |
6ca94ac9 KH |
6341 | *iprev = iblk->next; |
6342 | /* Unhook from the free list. */ | |
439d5cb4 | 6343 | interval_free_list = INTERVAL_PARENT (&iblk->intervals[0]); |
c8099634 | 6344 | lisp_free (iblk); |
6ca94ac9 KH |
6345 | } |
6346 | else | |
6feef451 AS |
6347 | { |
6348 | num_free += this_free; | |
6349 | iprev = &iblk->next; | |
6350 | } | |
d5e35230 JA |
6351 | } |
6352 | total_intervals = num_used; | |
6353 | total_free_intervals = num_free; | |
6354 | } | |
d5e35230 | 6355 | |
7146af97 JB |
6356 | /* Put all unmarked symbols on free list */ |
6357 | { | |
6358 | register struct symbol_block *sblk; | |
6ca94ac9 | 6359 | struct symbol_block **sprev = &symbol_block; |
7146af97 | 6360 | register int lim = symbol_block_index; |
c0c5c8ae | 6361 | EMACS_INT num_free = 0, num_used = 0; |
7146af97 | 6362 | |
d285b373 | 6363 | symbol_free_list = NULL; |
177c0ea7 | 6364 | |
6ca94ac9 | 6365 | for (sblk = symbol_block; sblk; sblk = *sprev) |
7146af97 | 6366 | { |
6ca94ac9 | 6367 | int this_free = 0; |
d55c12ed AS |
6368 | union aligned_Lisp_Symbol *sym = sblk->symbols; |
6369 | union aligned_Lisp_Symbol *end = sym + lim; | |
d285b373 GM |
6370 | |
6371 | for (; sym < end; ++sym) | |
6372 | { | |
20035321 SM |
6373 | /* Check if the symbol was created during loadup. In such a case |
6374 | it might be pointed to by pure bytecode which we don't trace, | |
6375 | so we conservatively assume that it is live. */ | |
fce31d69 | 6376 | bool pure_p = PURE_POINTER_P (XSTRING (sym->s.name)); |
177c0ea7 | 6377 | |
d55c12ed | 6378 | if (!sym->s.gcmarkbit && !pure_p) |
d285b373 | 6379 | { |
d55c12ed AS |
6380 | if (sym->s.redirect == SYMBOL_LOCALIZED) |
6381 | xfree (SYMBOL_BLV (&sym->s)); | |
6382 | sym->s.next = symbol_free_list; | |
6383 | symbol_free_list = &sym->s; | |
34400008 | 6384 | #if GC_MARK_STACK |
c644523b | 6385 | symbol_free_list->function = Vdead; |
34400008 | 6386 | #endif |
d285b373 GM |
6387 | ++this_free; |
6388 | } | |
6389 | else | |
6390 | { | |
6391 | ++num_used; | |
6392 | if (!pure_p) | |
c644523b | 6393 | UNMARK_STRING (XSTRING (sym->s.name)); |
d55c12ed | 6394 | sym->s.gcmarkbit = 0; |
d285b373 GM |
6395 | } |
6396 | } | |
177c0ea7 | 6397 | |
7146af97 | 6398 | lim = SYMBOL_BLOCK_SIZE; |
6ca94ac9 KH |
6399 | /* If this block contains only free symbols and we have already |
6400 | seen more than two blocks worth of free symbols then deallocate | |
6401 | this block. */ | |
6feef451 | 6402 | if (this_free == SYMBOL_BLOCK_SIZE && num_free > SYMBOL_BLOCK_SIZE) |
6ca94ac9 | 6403 | { |
6ca94ac9 KH |
6404 | *sprev = sblk->next; |
6405 | /* Unhook from the free list. */ | |
d55c12ed | 6406 | symbol_free_list = sblk->symbols[0].s.next; |
c8099634 | 6407 | lisp_free (sblk); |
6ca94ac9 KH |
6408 | } |
6409 | else | |
6feef451 AS |
6410 | { |
6411 | num_free += this_free; | |
6412 | sprev = &sblk->next; | |
6413 | } | |
7146af97 JB |
6414 | } |
6415 | total_symbols = num_used; | |
6416 | total_free_symbols = num_free; | |
6417 | } | |
6418 | ||
a9faeabe RS |
6419 | /* Put all unmarked misc's on free list. |
6420 | For a marker, first unchain it from the buffer it points into. */ | |
7146af97 JB |
6421 | { |
6422 | register struct marker_block *mblk; | |
6ca94ac9 | 6423 | struct marker_block **mprev = &marker_block; |
7146af97 | 6424 | register int lim = marker_block_index; |
c0c5c8ae | 6425 | EMACS_INT num_free = 0, num_used = 0; |
7146af97 JB |
6426 | |
6427 | marker_free_list = 0; | |
177c0ea7 | 6428 | |
6ca94ac9 | 6429 | for (mblk = marker_block; mblk; mblk = *mprev) |
7146af97 JB |
6430 | { |
6431 | register int i; | |
6ca94ac9 | 6432 | int this_free = 0; |
fa05e253 | 6433 | |
7146af97 | 6434 | for (i = 0; i < lim; i++) |
465edf35 | 6435 | { |
d55c12ed | 6436 | if (!mblk->markers[i].m.u_any.gcmarkbit) |
465edf35 | 6437 | { |
d55c12ed AS |
6438 | if (mblk->markers[i].m.u_any.type == Lisp_Misc_Marker) |
6439 | unchain_marker (&mblk->markers[i].m.u_marker); | |
fa05e253 RS |
6440 | /* Set the type of the freed object to Lisp_Misc_Free. |
6441 | We could leave the type alone, since nobody checks it, | |
465edf35 | 6442 | but this might catch bugs faster. */ |
d55c12ed AS |
6443 | mblk->markers[i].m.u_marker.type = Lisp_Misc_Free; |
6444 | mblk->markers[i].m.u_free.chain = marker_free_list; | |
6445 | marker_free_list = &mblk->markers[i].m; | |
6ca94ac9 | 6446 | this_free++; |
465edf35 KH |
6447 | } |
6448 | else | |
6449 | { | |
6450 | num_used++; | |
d55c12ed | 6451 | mblk->markers[i].m.u_any.gcmarkbit = 0; |
465edf35 KH |
6452 | } |
6453 | } | |
7146af97 | 6454 | lim = MARKER_BLOCK_SIZE; |
6ca94ac9 KH |
6455 | /* If this block contains only free markers and we have already |
6456 | seen more than two blocks worth of free markers then deallocate | |
6457 | this block. */ | |
6feef451 | 6458 | if (this_free == MARKER_BLOCK_SIZE && num_free > MARKER_BLOCK_SIZE) |
6ca94ac9 | 6459 | { |
6ca94ac9 KH |
6460 | *mprev = mblk->next; |
6461 | /* Unhook from the free list. */ | |
d55c12ed | 6462 | marker_free_list = mblk->markers[0].m.u_free.chain; |
c8099634 | 6463 | lisp_free (mblk); |
6ca94ac9 KH |
6464 | } |
6465 | else | |
6feef451 AS |
6466 | { |
6467 | num_free += this_free; | |
6468 | mprev = &mblk->next; | |
6469 | } | |
7146af97 JB |
6470 | } |
6471 | ||
6472 | total_markers = num_used; | |
6473 | total_free_markers = num_free; | |
6474 | } | |
6475 | ||
6476 | /* Free all unmarked buffers */ | |
6477 | { | |
3e98c68e | 6478 | register struct buffer *buffer, **bprev = &all_buffers; |
7146af97 | 6479 | |
3ab6e069 | 6480 | total_buffers = 0; |
3e98c68e | 6481 | for (buffer = all_buffers; buffer; buffer = *bprev) |
3ef06d12 | 6482 | if (!VECTOR_MARKED_P (buffer)) |
7146af97 | 6483 | { |
914adc42 | 6484 | *bprev = buffer->next; |
34400008 | 6485 | lisp_free (buffer); |
7146af97 JB |
6486 | } |
6487 | else | |
6488 | { | |
3ef06d12 | 6489 | VECTOR_UNMARK (buffer); |
8707c1e5 DA |
6490 | /* Do not use buffer_(set|get)_intervals here. */ |
6491 | buffer->text->intervals = balance_intervals (buffer->text->intervals); | |
3ab6e069 | 6492 | total_buffers++; |
914adc42 | 6493 | bprev = &buffer->next; |
7146af97 JB |
6494 | } |
6495 | } | |
6496 | ||
f3372c87 | 6497 | sweep_vectors (); |
e499d0ee | 6498 | check_string_bytes (!noninteractive); |
7146af97 | 6499 | } |
7146af97 | 6500 | |
7146af97 | 6501 | |
7146af97 | 6502 | |
7146af97 | 6503 | \f |
20d24714 JB |
6504 | /* Debugging aids. */ |
6505 | ||
31ce1c91 | 6506 | DEFUN ("memory-limit", Fmemory_limit, Smemory_limit, 0, 0, 0, |
a6266d23 | 6507 | doc: /* Return the address of the last byte Emacs has allocated, divided by 1024. |
228299fa | 6508 | This may be helpful in debugging Emacs's memory usage. |
7ee72033 | 6509 | We divide the value by 1024 to make sure it fits in a Lisp integer. */) |
5842a27b | 6510 | (void) |
20d24714 JB |
6511 | { |
6512 | Lisp_Object end; | |
6513 | ||
d01a7826 | 6514 | XSETINT (end, (intptr_t) (char *) sbrk (0) / 1024); |
20d24714 JB |
6515 | |
6516 | return end; | |
6517 | } | |
6518 | ||
310ea200 | 6519 | DEFUN ("memory-use-counts", Fmemory_use_counts, Smemory_use_counts, 0, 0, 0, |
a6266d23 | 6520 | doc: /* Return a list of counters that measure how much consing there has been. |
228299fa GM |
6521 | Each of these counters increments for a certain kind of object. |
6522 | The counters wrap around from the largest positive integer to zero. | |
6523 | Garbage collection does not decrease them. | |
6524 | The elements of the value are as follows: | |
6525 | (CONSES FLOATS VECTOR-CELLS SYMBOLS STRING-CHARS MISCS INTERVALS STRINGS) | |
6526 | All are in units of 1 = one object consed | |
6527 | except for VECTOR-CELLS and STRING-CHARS, which count the total length of | |
6528 | objects consed. | |
6529 | MISCS include overlays, markers, and some internal types. | |
6530 | Frames, windows, buffers, and subprocesses count as vectors | |
7ee72033 | 6531 | (but the contents of a buffer's text do not count here). */) |
5842a27b | 6532 | (void) |
310ea200 | 6533 | { |
3438fe21 | 6534 | return listn (CONSTYPE_HEAP, 8, |
694b6c97 DA |
6535 | bounded_number (cons_cells_consed), |
6536 | bounded_number (floats_consed), | |
6537 | bounded_number (vector_cells_consed), | |
6538 | bounded_number (symbols_consed), | |
6539 | bounded_number (string_chars_consed), | |
6540 | bounded_number (misc_objects_consed), | |
6541 | bounded_number (intervals_consed), | |
6542 | bounded_number (strings_consed)); | |
310ea200 | 6543 | } |
e0b8c689 | 6544 | |
8b058d44 EZ |
6545 | /* Find at most FIND_MAX symbols which have OBJ as their value or |
6546 | function. This is used in gdbinit's `xwhichsymbols' command. */ | |
6547 | ||
6548 | Lisp_Object | |
196e41e4 | 6549 | which_symbols (Lisp_Object obj, EMACS_INT find_max) |
8b058d44 EZ |
6550 | { |
6551 | struct symbol_block *sblk; | |
8d0eb4c2 | 6552 | ptrdiff_t gc_count = inhibit_garbage_collection (); |
8b058d44 EZ |
6553 | Lisp_Object found = Qnil; |
6554 | ||
ca78dc43 | 6555 | if (! DEADP (obj)) |
8b058d44 EZ |
6556 | { |
6557 | for (sblk = symbol_block; sblk; sblk = sblk->next) | |
6558 | { | |
9426aba4 | 6559 | union aligned_Lisp_Symbol *aligned_sym = sblk->symbols; |
8b058d44 EZ |
6560 | int bn; |
6561 | ||
9426aba4 | 6562 | for (bn = 0; bn < SYMBOL_BLOCK_SIZE; bn++, aligned_sym++) |
8b058d44 | 6563 | { |
9426aba4 | 6564 | struct Lisp_Symbol *sym = &aligned_sym->s; |
8b058d44 EZ |
6565 | Lisp_Object val; |
6566 | Lisp_Object tem; | |
6567 | ||
6568 | if (sblk == symbol_block && bn >= symbol_block_index) | |
6569 | break; | |
6570 | ||
6571 | XSETSYMBOL (tem, sym); | |
6572 | val = find_symbol_value (tem); | |
6573 | if (EQ (val, obj) | |
c644523b DA |
6574 | || EQ (sym->function, obj) |
6575 | || (!NILP (sym->function) | |
6576 | && COMPILEDP (sym->function) | |
6577 | && EQ (AREF (sym->function, COMPILED_BYTECODE), obj)) | |
8b058d44 EZ |
6578 | || (!NILP (val) |
6579 | && COMPILEDP (val) | |
6580 | && EQ (AREF (val, COMPILED_BYTECODE), obj))) | |
6581 | { | |
6582 | found = Fcons (tem, found); | |
6583 | if (--find_max == 0) | |
6584 | goto out; | |
6585 | } | |
6586 | } | |
6587 | } | |
6588 | } | |
6589 | ||
6590 | out: | |
6591 | unbind_to (gc_count, Qnil); | |
6592 | return found; | |
6593 | } | |
6594 | ||
244ed907 | 6595 | #ifdef ENABLE_CHECKING |
f4a681b0 | 6596 | |
fce31d69 | 6597 | bool suppress_checking; |
d3d47262 | 6598 | |
e0b8c689 | 6599 | void |
971de7fb | 6600 | die (const char *msg, const char *file, int line) |
e0b8c689 | 6601 | { |
5013fc08 | 6602 | fprintf (stderr, "\r\n%s:%d: Emacs fatal error: assertion failed: %s\r\n", |
e0b8c689 | 6603 | file, line, msg); |
4d7e6e51 | 6604 | terminate_due_to_signal (SIGABRT, INT_MAX); |
e0b8c689 | 6605 | } |
244ed907 | 6606 | #endif |
20d24714 | 6607 | \f |
b09cca6a | 6608 | /* Initialization. */ |
7146af97 | 6609 | |
dfcf069d | 6610 | void |
971de7fb | 6611 | init_alloc_once (void) |
7146af97 JB |
6612 | { |
6613 | /* Used to do Vpurify_flag = Qt here, but Qt isn't set up yet! */ | |
9e713715 GM |
6614 | purebeg = PUREBEG; |
6615 | pure_size = PURESIZE; | |
ab6780cd | 6616 | |
877935b1 | 6617 | #if GC_MARK_STACK || defined GC_MALLOC_CHECK |
34400008 GM |
6618 | mem_init (); |
6619 | Vdead = make_pure_string ("DEAD", 4, 4, 0); | |
6620 | #endif | |
9e713715 | 6621 | |
d1658221 | 6622 | #ifdef DOUG_LEA_MALLOC |
b09cca6a SM |
6623 | mallopt (M_TRIM_THRESHOLD, 128 * 1024); /* Trim threshold. */ |
6624 | mallopt (M_MMAP_THRESHOLD, 64 * 1024); /* Mmap threshold. */ | |
6625 | mallopt (M_MMAP_MAX, MMAP_MAX_AREAS); /* Max. number of mmap'ed areas. */ | |
d1658221 | 6626 | #endif |
7146af97 | 6627 | init_strings (); |
f3372c87 | 6628 | init_vectors (); |
d5e35230 | 6629 | |
24d8a105 | 6630 | refill_memory_reserve (); |
0dd6d66d | 6631 | gc_cons_threshold = GC_DEFAULT_THRESHOLD; |
7146af97 JB |
6632 | } |
6633 | ||
dfcf069d | 6634 | void |
971de7fb | 6635 | init_alloc (void) |
7146af97 JB |
6636 | { |
6637 | gcprolist = 0; | |
630686c8 | 6638 | byte_stack_list = 0; |
182ff242 GM |
6639 | #if GC_MARK_STACK |
6640 | #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS | |
6641 | setjmp_tested_p = longjmps_done = 0; | |
6642 | #endif | |
6643 | #endif | |
2c5bd608 DL |
6644 | Vgc_elapsed = make_float (0.0); |
6645 | gcs_done = 0; | |
7146af97 JB |
6646 | } |
6647 | ||
6648 | void | |
971de7fb | 6649 | syms_of_alloc (void) |
7146af97 | 6650 | { |
29208e82 | 6651 | DEFVAR_INT ("gc-cons-threshold", gc_cons_threshold, |
fb7ada5f | 6652 | doc: /* Number of bytes of consing between garbage collections. |
228299fa GM |
6653 | Garbage collection can happen automatically once this many bytes have been |
6654 | allocated since the last garbage collection. All data types count. | |
7146af97 | 6655 | |
228299fa | 6656 | Garbage collection happens automatically only when `eval' is called. |
7146af97 | 6657 | |
228299fa | 6658 | By binding this temporarily to a large number, you can effectively |
96f077ad SM |
6659 | prevent garbage collection during a part of the program. |
6660 | See also `gc-cons-percentage'. */); | |
6661 | ||
29208e82 | 6662 | DEFVAR_LISP ("gc-cons-percentage", Vgc_cons_percentage, |
fb7ada5f | 6663 | doc: /* Portion of the heap used for allocation. |
96f077ad SM |
6664 | Garbage collection can happen automatically once this portion of the heap |
6665 | has been allocated since the last garbage collection. | |
6666 | If this portion is smaller than `gc-cons-threshold', this is ignored. */); | |
6667 | Vgc_cons_percentage = make_float (0.1); | |
0819585c | 6668 | |
29208e82 | 6669 | DEFVAR_INT ("pure-bytes-used", pure_bytes_used, |
333f9019 | 6670 | doc: /* Number of bytes of shareable Lisp data allocated so far. */); |
0819585c | 6671 | |
29208e82 | 6672 | DEFVAR_INT ("cons-cells-consed", cons_cells_consed, |
a6266d23 | 6673 | doc: /* Number of cons cells that have been consed so far. */); |
0819585c | 6674 | |
29208e82 | 6675 | DEFVAR_INT ("floats-consed", floats_consed, |
a6266d23 | 6676 | doc: /* Number of floats that have been consed so far. */); |
0819585c | 6677 | |
29208e82 | 6678 | DEFVAR_INT ("vector-cells-consed", vector_cells_consed, |
a6266d23 | 6679 | doc: /* Number of vector cells that have been consed so far. */); |
0819585c | 6680 | |
29208e82 | 6681 | DEFVAR_INT ("symbols-consed", symbols_consed, |
a6266d23 | 6682 | doc: /* Number of symbols that have been consed so far. */); |
0819585c | 6683 | |
29208e82 | 6684 | DEFVAR_INT ("string-chars-consed", string_chars_consed, |
a6266d23 | 6685 | doc: /* Number of string characters that have been consed so far. */); |
0819585c | 6686 | |
29208e82 | 6687 | DEFVAR_INT ("misc-objects-consed", misc_objects_consed, |
01a6dcc8 GM |
6688 | doc: /* Number of miscellaneous objects that have been consed so far. |
6689 | These include markers and overlays, plus certain objects not visible | |
6690 | to users. */); | |
2e471eb5 | 6691 | |
29208e82 | 6692 | DEFVAR_INT ("intervals-consed", intervals_consed, |
a6266d23 | 6693 | doc: /* Number of intervals that have been consed so far. */); |
7146af97 | 6694 | |
29208e82 | 6695 | DEFVAR_INT ("strings-consed", strings_consed, |
a6266d23 | 6696 | doc: /* Number of strings that have been consed so far. */); |
228299fa | 6697 | |
29208e82 | 6698 | DEFVAR_LISP ("purify-flag", Vpurify_flag, |
a6266d23 | 6699 | doc: /* Non-nil means loading Lisp code in order to dump an executable. |
e9515805 SM |
6700 | This means that certain objects should be allocated in shared (pure) space. |
6701 | It can also be set to a hash-table, in which case this table is used to | |
6702 | do hash-consing of the objects allocated to pure space. */); | |
228299fa | 6703 | |
29208e82 | 6704 | DEFVAR_BOOL ("garbage-collection-messages", garbage_collection_messages, |
a6266d23 | 6705 | doc: /* Non-nil means display messages at start and end of garbage collection. */); |
299585ee RS |
6706 | garbage_collection_messages = 0; |
6707 | ||
29208e82 | 6708 | DEFVAR_LISP ("post-gc-hook", Vpost_gc_hook, |
a6266d23 | 6709 | doc: /* Hook run after garbage collection has finished. */); |
9e713715 | 6710 | Vpost_gc_hook = Qnil; |
cd3520a4 | 6711 | DEFSYM (Qpost_gc_hook, "post-gc-hook"); |
9e713715 | 6712 | |
29208e82 | 6713 | DEFVAR_LISP ("memory-signal-data", Vmemory_signal_data, |
74a54b04 | 6714 | doc: /* Precomputed `signal' argument for memory-full error. */); |
bcb61d60 KH |
6715 | /* We build this in advance because if we wait until we need it, we might |
6716 | not be able to allocate the memory to hold it. */ | |
74a54b04 | 6717 | Vmemory_signal_data |
3438fe21 | 6718 | = listn (CONSTYPE_PURE, 2, Qerror, |
694b6c97 | 6719 | build_pure_c_string ("Memory exhausted--use M-x save-some-buffers then exit and restart Emacs")); |
74a54b04 | 6720 | |
29208e82 | 6721 | DEFVAR_LISP ("memory-full", Vmemory_full, |
24d8a105 | 6722 | doc: /* Non-nil means Emacs cannot get much more Lisp memory. */); |
74a54b04 | 6723 | Vmemory_full = Qnil; |
bcb61d60 | 6724 | |
fecbd8ff SM |
6725 | DEFSYM (Qconses, "conses"); |
6726 | DEFSYM (Qsymbols, "symbols"); | |
6727 | DEFSYM (Qmiscs, "miscs"); | |
6728 | DEFSYM (Qstrings, "strings"); | |
6729 | DEFSYM (Qvectors, "vectors"); | |
6730 | DEFSYM (Qfloats, "floats"); | |
6731 | DEFSYM (Qintervals, "intervals"); | |
6732 | DEFSYM (Qbuffers, "buffers"); | |
5b835e1d DA |
6733 | DEFSYM (Qstring_bytes, "string-bytes"); |
6734 | DEFSYM (Qvector_slots, "vector-slots"); | |
f8643a6b | 6735 | DEFSYM (Qheap, "heap"); |
3d80c99f | 6736 | DEFSYM (Qautomatic_gc, "Automatic GC"); |
5b835e1d | 6737 | |
cd3520a4 JB |
6738 | DEFSYM (Qgc_cons_threshold, "gc-cons-threshold"); |
6739 | DEFSYM (Qchar_table_extra_slots, "char-table-extra-slots"); | |
a59de17b | 6740 | |
29208e82 | 6741 | DEFVAR_LISP ("gc-elapsed", Vgc_elapsed, |
2c5bd608 | 6742 | doc: /* Accumulated time elapsed in garbage collections. |
e7415487 | 6743 | The time is in seconds as a floating point value. */); |
29208e82 | 6744 | DEFVAR_INT ("gcs-done", gcs_done, |
e7415487 | 6745 | doc: /* Accumulated number of garbage collections done. */); |
2c5bd608 | 6746 | |
7146af97 JB |
6747 | defsubr (&Scons); |
6748 | defsubr (&Slist); | |
6749 | defsubr (&Svector); | |
6750 | defsubr (&Smake_byte_code); | |
6751 | defsubr (&Smake_list); | |
6752 | defsubr (&Smake_vector); | |
6753 | defsubr (&Smake_string); | |
7b07587b | 6754 | defsubr (&Smake_bool_vector); |
7146af97 JB |
6755 | defsubr (&Smake_symbol); |
6756 | defsubr (&Smake_marker); | |
6757 | defsubr (&Spurecopy); | |
6758 | defsubr (&Sgarbage_collect); | |
20d24714 | 6759 | defsubr (&Smemory_limit); |
310ea200 | 6760 | defsubr (&Smemory_use_counts); |
34400008 GM |
6761 | |
6762 | #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES | |
6763 | defsubr (&Sgc_status); | |
6764 | #endif | |
7146af97 | 6765 | } |
5eceb8fb | 6766 | |
4706125e PE |
6767 | /* When compiled with GCC, GDB might say "No enum type named |
6768 | pvec_type" if we don't have at least one symbol with that type, and | |
6769 | then xbacktrace could fail. Similarly for the other enums and | |
62aba0d4 FP |
6770 | their values. Some non-GCC compilers don't like these constructs. */ |
6771 | #ifdef __GNUC__ | |
4706125e PE |
6772 | union |
6773 | { | |
03a660a6 PE |
6774 | enum CHARTAB_SIZE_BITS CHARTAB_SIZE_BITS; |
6775 | enum CHAR_TABLE_STANDARD_SLOTS CHAR_TABLE_STANDARD_SLOTS; | |
6776 | enum char_bits char_bits; | |
4706125e | 6777 | enum CHECK_LISP_OBJECT_TYPE CHECK_LISP_OBJECT_TYPE; |
03a660a6 | 6778 | enum DEFAULT_HASH_SIZE DEFAULT_HASH_SIZE; |
4706125e | 6779 | enum enum_USE_LSB_TAG enum_USE_LSB_TAG; |
03a660a6 | 6780 | enum FLOAT_TO_STRING_BUFSIZE FLOAT_TO_STRING_BUFSIZE; |
4706125e | 6781 | enum Lisp_Bits Lisp_Bits; |
03a660a6 PE |
6782 | enum Lisp_Compiled Lisp_Compiled; |
6783 | enum maxargs maxargs; | |
6784 | enum MAX_ALLOCA MAX_ALLOCA; | |
4706125e PE |
6785 | enum More_Lisp_Bits More_Lisp_Bits; |
6786 | enum pvec_type pvec_type; | |
6787 | } const EXTERNALLY_VISIBLE gdb_make_enums_visible = {0}; | |
62aba0d4 | 6788 | #endif /* __GNUC__ */ |