Commit | Line | Data |
---|---|---|
22a52da1 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc. |
a00c95d9 | 2 | * |
0f2d19dd JB |
3 | * This program is free software; you can redistribute it and/or modify |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
a00c95d9 | 7 | * |
0f2d19dd JB |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
a00c95d9 | 12 | * |
0f2d19dd JB |
13 | * You should have received a copy of the GNU General Public License |
14 | * along with this software; see the file COPYING. If not, write to | |
82892bed JB |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
17 | * |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
82892bed | 40 | * If you do not wish that, delete this exception notice. */ |
1bbd0b84 GB |
41 | |
42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
44 | ||
37ddcaf6 MD |
45 | /* #define DEBUGINFO */ |
46 | ||
56495472 ML |
47 | /* SECTION: This code is compiled once. |
48 | */ | |
49 | ||
50 | #ifndef MARK_DEPENDENCIES | |
51 | ||
0f2d19dd JB |
52 | \f |
53 | #include <stdio.h> | |
e6e2e95a | 54 | #include <errno.h> |
783e7774 | 55 | #include <string.h> |
e6e2e95a | 56 | |
a0599745 | 57 | #include "libguile/_scm.h" |
0a7a7445 | 58 | #include "libguile/eval.h" |
a0599745 MD |
59 | #include "libguile/stime.h" |
60 | #include "libguile/stackchk.h" | |
61 | #include "libguile/struct.h" | |
a0599745 MD |
62 | #include "libguile/smob.h" |
63 | #include "libguile/unif.h" | |
64 | #include "libguile/async.h" | |
65 | #include "libguile/ports.h" | |
66 | #include "libguile/root.h" | |
67 | #include "libguile/strings.h" | |
68 | #include "libguile/vectors.h" | |
801cb5e7 | 69 | #include "libguile/weaks.h" |
686765af | 70 | #include "libguile/hashtab.h" |
ecf470a2 | 71 | #include "libguile/tags.h" |
a0599745 MD |
72 | |
73 | #include "libguile/validate.h" | |
1be6b49c | 74 | #include "libguile/deprecation.h" |
a0599745 | 75 | #include "libguile/gc.h" |
fce59c93 | 76 | |
bc9d9bb2 | 77 | #ifdef GUILE_DEBUG_MALLOC |
a0599745 | 78 | #include "libguile/debug-malloc.h" |
bc9d9bb2 MD |
79 | #endif |
80 | ||
0f2d19dd | 81 | #ifdef HAVE_MALLOC_H |
95b88819 | 82 | #include <malloc.h> |
0f2d19dd JB |
83 | #endif |
84 | ||
85 | #ifdef HAVE_UNISTD_H | |
95b88819 | 86 | #include <unistd.h> |
0f2d19dd JB |
87 | #endif |
88 | ||
1cc91f1b JB |
89 | #ifdef __STDC__ |
90 | #include <stdarg.h> | |
91 | #define var_start(x, y) va_start(x, y) | |
92 | #else | |
93 | #include <varargs.h> | |
94 | #define var_start(x, y) va_start(x) | |
95 | #endif | |
96 | ||
0f2d19dd | 97 | \f |
406c7d90 DH |
98 | |
99 | unsigned int scm_gc_running_p = 0; | |
100 | ||
101 | \f | |
102 | ||
103 | #if (SCM_DEBUG_CELL_ACCESSES == 1) | |
104 | ||
61045190 DH |
105 | scm_bits_t scm_tc16_allocated; |
106 | ||
107 | /* Set this to != 0 if every cell that is accessed shall be checked: | |
108 | */ | |
109 | unsigned int scm_debug_cell_accesses_p = 1; | |
406c7d90 DH |
110 | |
111 | ||
112 | /* Assert that the given object is a valid reference to a valid cell. This | |
113 | * test involves to determine whether the object is a cell pointer, whether | |
114 | * this pointer actually points into a heap segment and whether the cell | |
115 | * pointed to is not a free cell. | |
116 | */ | |
117 | void | |
118 | scm_assert_cell_valid (SCM cell) | |
119 | { | |
61045190 DH |
120 | static unsigned int already_running = 0; |
121 | ||
122 | if (scm_debug_cell_accesses_p && !already_running) | |
406c7d90 | 123 | { |
61045190 | 124 | already_running = 1; /* set to avoid recursion */ |
406c7d90 | 125 | |
9d47a1e6 | 126 | if (!scm_cellp (cell)) |
406c7d90 | 127 | { |
1be6b49c ML |
128 | fprintf (stderr, "scm_assert_cell_valid: Not a cell object: %lux\n", |
129 | (unsigned long) SCM_UNPACK (cell)); | |
406c7d90 DH |
130 | abort (); |
131 | } | |
132 | else if (!scm_gc_running_p) | |
133 | { | |
134 | /* Dirk::FIXME:: During garbage collection there occur references to | |
135 | free cells. This is allright during conservative marking, but | |
136 | should not happen otherwise (I think). The case of free cells | |
137 | accessed during conservative marking is handled in function | |
138 | scm_mark_locations. However, there still occur accesses to free | |
139 | cells during gc. I don't understand why this happens. If it is | |
140 | a bug and gets fixed, the following test should also work while | |
141 | gc is running. | |
142 | */ | |
143 | if (SCM_FREE_CELL_P (cell)) | |
144 | { | |
1be6b49c ML |
145 | fprintf (stderr, "scm_assert_cell_valid: Accessing free cell: %lux\n", |
146 | (unsigned long) SCM_UNPACK (cell)); | |
406c7d90 DH |
147 | abort (); |
148 | } | |
149 | } | |
61045190 | 150 | already_running = 0; /* re-enable */ |
406c7d90 DH |
151 | } |
152 | } | |
153 | ||
154 | ||
155 | SCM_DEFINE (scm_set_debug_cell_accesses_x, "set-debug-cell-accesses!", 1, 0, 0, | |
156 | (SCM flag), | |
1e6808ea MG |
157 | "If @var{flag} is @code{#f}, cell access checking is disabled.\n" |
158 | "If @var{flag} is @code{#t}, cell access checking is enabled.\n" | |
159 | "This procedure only exists when the compile-time flag\n" | |
160 | "@code{SCM_DEBUG_CELL_ACCESSES} was set to 1.") | |
406c7d90 DH |
161 | #define FUNC_NAME s_scm_set_debug_cell_accesses_x |
162 | { | |
163 | if (SCM_FALSEP (flag)) { | |
164 | scm_debug_cell_accesses_p = 0; | |
165 | } else if (SCM_EQ_P (flag, SCM_BOOL_T)) { | |
166 | scm_debug_cell_accesses_p = 1; | |
167 | } else { | |
168 | SCM_WRONG_TYPE_ARG (1, flag); | |
169 | } | |
170 | return SCM_UNSPECIFIED; | |
171 | } | |
172 | #undef FUNC_NAME | |
173 | ||
174 | #endif /* SCM_DEBUG_CELL_ACCESSES == 1 */ | |
175 | ||
176 | \f | |
177 | ||
0f2d19dd | 178 | /* {heap tuning parameters} |
a00c95d9 | 179 | * |
0f2d19dd JB |
180 | * These are parameters for controlling memory allocation. The heap |
181 | * is the area out of which scm_cons, and object headers are allocated. | |
182 | * | |
183 | * Each heap cell is 8 bytes on a 32 bit machine and 16 bytes on a | |
184 | * 64 bit machine. The units of the _SIZE parameters are bytes. | |
185 | * Cons pairs and object headers occupy one heap cell. | |
186 | * | |
187 | * SCM_INIT_HEAP_SIZE is the initial size of heap. If this much heap is | |
188 | * allocated initially the heap will grow by half its current size | |
189 | * each subsequent time more heap is needed. | |
190 | * | |
191 | * If SCM_INIT_HEAP_SIZE heap cannot be allocated initially, SCM_HEAP_SEG_SIZE | |
192 | * will be used, and the heap will grow by SCM_HEAP_SEG_SIZE when more | |
1be6b49c | 193 | * heap is needed. SCM_HEAP_SEG_SIZE must fit into type size_t. This code |
0f2d19dd | 194 | * is in scm_init_storage() and alloc_some_heap() in sys.c |
a00c95d9 | 195 | * |
0f2d19dd JB |
196 | * If SCM_INIT_HEAP_SIZE can be allocated initially, the heap will grow by |
197 | * SCM_EXPHEAP(scm_heap_size) when more heap is needed. | |
198 | * | |
199 | * SCM_MIN_HEAP_SEG_SIZE is minimum size of heap to accept when more heap | |
200 | * is needed. | |
201 | * | |
202 | * INIT_MALLOC_LIMIT is the initial amount of malloc usage which will | |
a00c95d9 | 203 | * trigger a GC. |
6064dcc6 MV |
204 | * |
205 | * SCM_MTRIGGER_HYSTERESIS is the amount of malloc storage that must be | |
206 | * reclaimed by a GC triggered by must_malloc. If less than this is | |
207 | * reclaimed, the trigger threshold is raised. [I don't know what a | |
208 | * good value is. I arbitrarily chose 1/10 of the INIT_MALLOC_LIMIT to | |
a00c95d9 | 209 | * work around a oscillation that caused almost constant GC.] |
0f2d19dd JB |
210 | */ |
211 | ||
8fef55a8 MD |
212 | /* |
213 | * Heap size 45000 and 40% min yield gives quick startup and no extra | |
214 | * heap allocation. Having higher values on min yield may lead to | |
215 | * large heaps, especially if code behaviour is varying its | |
216 | * maximum consumption between different freelists. | |
217 | */ | |
d6884e63 ML |
218 | |
219 | #define SCM_DATA_CELLS2CARDS(n) (((n) + SCM_GC_CARD_N_DATA_CELLS - 1) / SCM_GC_CARD_N_DATA_CELLS) | |
220 | #define SCM_CARDS_PER_CLUSTER SCM_DATA_CELLS2CARDS (2000L) | |
221 | #define SCM_CLUSTER_SIZE_1 (SCM_CARDS_PER_CLUSTER * SCM_GC_CARD_N_DATA_CELLS) | |
1be6b49c | 222 | size_t scm_default_init_heap_size_1 = (((SCM_DATA_CELLS2CARDS (45000L) + SCM_CARDS_PER_CLUSTER - 1) |
d6884e63 | 223 | / SCM_CARDS_PER_CLUSTER) * SCM_GC_CARD_SIZE); |
aeacfc8f | 224 | int scm_default_min_yield_1 = 40; |
4c48ba06 | 225 | |
d6884e63 | 226 | #define SCM_CLUSTER_SIZE_2 (SCM_CARDS_PER_CLUSTER * (SCM_GC_CARD_N_DATA_CELLS / 2)) |
1be6b49c | 227 | size_t scm_default_init_heap_size_2 = (((SCM_DATA_CELLS2CARDS (2500L * 2) + SCM_CARDS_PER_CLUSTER - 1) |
d6884e63 | 228 | / SCM_CARDS_PER_CLUSTER) * SCM_GC_CARD_SIZE); |
4c48ba06 MD |
229 | /* The following value may seem large, but note that if we get to GC at |
230 | * all, this means that we have a numerically intensive application | |
231 | */ | |
aeacfc8f | 232 | int scm_default_min_yield_2 = 40; |
4c48ba06 | 233 | |
1be6b49c | 234 | size_t scm_default_max_segment_size = 2097000L;/* a little less (adm) than 2 Mb */ |
4c48ba06 | 235 | |
d6884e63 | 236 | #define SCM_MIN_HEAP_SEG_SIZE (8 * SCM_GC_CARD_SIZE) |
0f2d19dd JB |
237 | #ifdef _QC |
238 | # define SCM_HEAP_SEG_SIZE 32768L | |
239 | #else | |
240 | # ifdef sequent | |
4c48ba06 | 241 | # define SCM_HEAP_SEG_SIZE (7000L * sizeof (scm_cell)) |
0f2d19dd | 242 | # else |
4c48ba06 | 243 | # define SCM_HEAP_SEG_SIZE (16384L * sizeof (scm_cell)) |
0f2d19dd JB |
244 | # endif |
245 | #endif | |
4c48ba06 | 246 | /* Make heap grow with factor 1.5 */ |
4a4c9785 | 247 | #define SCM_EXPHEAP(scm_heap_size) (scm_heap_size / 2) |
0f2d19dd | 248 | #define SCM_INIT_MALLOC_LIMIT 100000 |
6064dcc6 | 249 | #define SCM_MTRIGGER_HYSTERESIS (SCM_INIT_MALLOC_LIMIT/10) |
0f2d19dd | 250 | |
d6884e63 ML |
251 | /* CELL_UP and CELL_DN are used by scm_init_heap_seg to find (scm_cell * span) |
252 | aligned inner bounds for allocated storage */ | |
0f2d19dd JB |
253 | |
254 | #ifdef PROT386 | |
255 | /*in 386 protected mode we must only adjust the offset */ | |
a00c95d9 ML |
256 | # define CELL_UP(p, span) MK_FP(FP_SEG(p), ~(8*(span)-1)&(FP_OFF(p)+8*(span)-1)) |
257 | # define CELL_DN(p, span) MK_FP(FP_SEG(p), ~(8*(span)-1)&FP_OFF(p)) | |
0f2d19dd JB |
258 | #else |
259 | # ifdef _UNICOS | |
c014a02e ML |
260 | # define CELL_UP(p, span) (SCM_CELLPTR)(~(span) & ((long)(p)+(span))) |
261 | # define CELL_DN(p, span) (SCM_CELLPTR)(~(span) & (long)(p)) | |
0f2d19dd | 262 | # else |
c014a02e ML |
263 | # define CELL_UP(p, span) (SCM_CELLPTR)(~(sizeof(scm_cell)*(span)-1L) & ((long)(p)+sizeof(scm_cell)*(span)-1L)) |
264 | # define CELL_DN(p, span) (SCM_CELLPTR)(~(sizeof(scm_cell)*(span)-1L) & (long)(p)) | |
0f2d19dd JB |
265 | # endif /* UNICOS */ |
266 | #endif /* PROT386 */ | |
267 | ||
ecf470a2 ML |
268 | #define DOUBLECELL_ALIGNED_P(x) (((2 * sizeof (scm_cell) - 1) & SCM_UNPACK (x)) == 0) |
269 | ||
d6884e63 ML |
270 | #define ALIGNMENT_SLACK(freelist) (SCM_GC_CARD_SIZE - 1) |
271 | #define CLUSTER_SIZE_IN_BYTES(freelist) \ | |
272 | (((freelist)->cluster_size / (SCM_GC_CARD_N_DATA_CELLS / (freelist)->span)) * SCM_GC_CARD_SIZE) | |
0f2d19dd JB |
273 | |
274 | \f | |
945fec60 | 275 | /* scm_freelists |
0f2d19dd | 276 | */ |
945fec60 | 277 | |
a00c95d9 ML |
278 | typedef struct scm_freelist_t { |
279 | /* collected cells */ | |
280 | SCM cells; | |
a00c95d9 ML |
281 | /* number of cells left to collect before cluster is full */ |
282 | unsigned int left_to_collect; | |
b37fe1c5 MD |
283 | /* number of clusters which have been allocated */ |
284 | unsigned int clusters_allocated; | |
8fef55a8 MD |
285 | /* a list of freelists, each of size cluster_size, |
286 | * except the last one which may be shorter | |
287 | */ | |
a00c95d9 ML |
288 | SCM clusters; |
289 | SCM *clustertail; | |
b37fe1c5 | 290 | /* this is the number of objects in each cluster, including the spine cell */ |
1be6b49c | 291 | unsigned int cluster_size; |
8fef55a8 | 292 | /* indicates that we should grow heap instead of GC:ing |
a00c95d9 ML |
293 | */ |
294 | int grow_heap_p; | |
8fef55a8 | 295 | /* minimum yield on this list in order not to grow the heap |
a00c95d9 | 296 | */ |
8fef55a8 MD |
297 | long min_yield; |
298 | /* defines min_yield as percent of total heap size | |
a00c95d9 | 299 | */ |
8fef55a8 | 300 | int min_yield_fraction; |
a00c95d9 ML |
301 | /* number of cells per object on this list */ |
302 | int span; | |
303 | /* number of collected cells during last GC */ | |
c014a02e | 304 | unsigned long collected; |
1811ebce | 305 | /* number of collected cells during penultimate GC */ |
c014a02e | 306 | unsigned long collected_1; |
a00c95d9 ML |
307 | /* total number of cells in heap segments |
308 | * belonging to this list. | |
309 | */ | |
c014a02e | 310 | unsigned long heap_size; |
a00c95d9 ML |
311 | } scm_freelist_t; |
312 | ||
4a4c9785 MD |
313 | SCM scm_freelist = SCM_EOL; |
314 | scm_freelist_t scm_master_freelist = { | |
b37fe1c5 | 315 | SCM_EOL, 0, 0, SCM_EOL, 0, SCM_CLUSTER_SIZE_1, 0, 0, 0, 1, 0, 0 |
4a4c9785 MD |
316 | }; |
317 | SCM scm_freelist2 = SCM_EOL; | |
318 | scm_freelist_t scm_master_freelist2 = { | |
b37fe1c5 | 319 | SCM_EOL, 0, 0, SCM_EOL, 0, SCM_CLUSTER_SIZE_2, 0, 0, 0, 2, 0, 0 |
4a4c9785 | 320 | }; |
0f2d19dd JB |
321 | |
322 | /* scm_mtrigger | |
323 | * is the number of bytes of must_malloc allocation needed to trigger gc. | |
324 | */ | |
c014a02e | 325 | unsigned long scm_mtrigger; |
0f2d19dd | 326 | |
0f2d19dd JB |
327 | /* scm_gc_heap_lock |
328 | * If set, don't expand the heap. Set only during gc, during which no allocation | |
329 | * is supposed to take place anyway. | |
330 | */ | |
331 | int scm_gc_heap_lock = 0; | |
332 | ||
333 | /* GC Blocking | |
334 | * Don't pause for collection if this is set -- just | |
335 | * expand the heap. | |
336 | */ | |
0f2d19dd JB |
337 | int scm_block_gc = 1; |
338 | ||
0f2d19dd JB |
339 | /* During collection, this accumulates objects holding |
340 | * weak references. | |
341 | */ | |
ab4bef85 | 342 | SCM scm_weak_vectors; |
0f2d19dd | 343 | |
7445e0e8 MD |
344 | /* During collection, this accumulates structures which are to be freed. |
345 | */ | |
346 | SCM scm_structs_to_free; | |
347 | ||
0f2d19dd JB |
348 | /* GC Statistics Keeping |
349 | */ | |
c014a02e ML |
350 | unsigned long scm_cells_allocated = 0; |
351 | unsigned long scm_mallocated = 0; | |
352 | unsigned long scm_gc_cells_collected; | |
353 | unsigned long scm_gc_yield; | |
354 | static unsigned long scm_gc_yield_1 = 0; /* previous GC yield */ | |
355 | unsigned long scm_gc_malloc_collected; | |
356 | unsigned long scm_gc_ports_collected; | |
0f2d19dd | 357 | unsigned long scm_gc_time_taken = 0; |
c014a02e ML |
358 | static unsigned long t_before_gc; |
359 | static unsigned long t_before_sweep; | |
c9b0d4b0 ML |
360 | unsigned long scm_gc_mark_time_taken = 0; |
361 | unsigned long scm_gc_sweep_time_taken = 0; | |
c014a02e ML |
362 | unsigned long scm_gc_times = 0; |
363 | unsigned long scm_gc_cells_swept = 0; | |
c9b0d4b0 ML |
364 | double scm_gc_cells_marked_acc = 0.; |
365 | double scm_gc_cells_swept_acc = 0.; | |
0f2d19dd JB |
366 | |
367 | SCM_SYMBOL (sym_cells_allocated, "cells-allocated"); | |
368 | SCM_SYMBOL (sym_heap_size, "cell-heap-size"); | |
369 | SCM_SYMBOL (sym_mallocated, "bytes-malloced"); | |
370 | SCM_SYMBOL (sym_mtrigger, "gc-malloc-threshold"); | |
371 | SCM_SYMBOL (sym_heap_segments, "cell-heap-segments"); | |
372 | SCM_SYMBOL (sym_gc_time_taken, "gc-time-taken"); | |
c9b0d4b0 ML |
373 | SCM_SYMBOL (sym_gc_mark_time_taken, "gc-mark-time-taken"); |
374 | SCM_SYMBOL (sym_gc_sweep_time_taken, "gc-sweep-time-taken"); | |
375 | SCM_SYMBOL (sym_times, "gc-times"); | |
376 | SCM_SYMBOL (sym_cells_marked, "cells-marked"); | |
377 | SCM_SYMBOL (sym_cells_swept, "cells-swept"); | |
0f2d19dd | 378 | |
a00c95d9 | 379 | typedef struct scm_heap_seg_data_t |
0f2d19dd | 380 | { |
cf2d30f6 JB |
381 | /* lower and upper bounds of the segment */ |
382 | SCM_CELLPTR bounds[2]; | |
383 | ||
384 | /* address of the head-of-freelist pointer for this segment's cells. | |
385 | All segments usually point to the same one, scm_freelist. */ | |
4c48ba06 | 386 | scm_freelist_t *freelist; |
cf2d30f6 | 387 | |
fe517a7d | 388 | /* number of cells per object in this segment */ |
945fec60 | 389 | int span; |
a00c95d9 | 390 | } scm_heap_seg_data_t; |
0f2d19dd JB |
391 | |
392 | ||
393 | ||
1be6b49c | 394 | static size_t init_heap_seg (SCM_CELLPTR, size_t, scm_freelist_t *); |
b6efc951 DH |
395 | |
396 | typedef enum { return_on_error, abort_on_error } policy_on_error; | |
397 | static void alloc_some_heap (scm_freelist_t *, policy_on_error); | |
0f2d19dd JB |
398 | |
399 | ||
d6884e63 ML |
400 | #define SCM_HEAP_SIZE \ |
401 | (scm_master_freelist.heap_size + scm_master_freelist2.heap_size) | |
402 | #define SCM_MAX(A, B) ((A) > (B) ? (A) : (B)) | |
403 | ||
404 | #define BVEC_GROW_SIZE 256 | |
405 | #define BVEC_GROW_SIZE_IN_LIMBS (SCM_GC_CARD_BVEC_SIZE_IN_LIMBS * BVEC_GROW_SIZE) | |
406 | #define BVEC_GROW_SIZE_IN_BYTES (BVEC_GROW_SIZE_IN_LIMBS * sizeof (scm_c_bvec_limb_t)) | |
407 | ||
408 | /* mark space allocation */ | |
409 | ||
410 | typedef struct scm_mark_space_t | |
411 | { | |
412 | scm_c_bvec_limb_t *bvec_space; | |
413 | struct scm_mark_space_t *next; | |
414 | } scm_mark_space_t; | |
415 | ||
416 | static scm_mark_space_t *current_mark_space; | |
417 | static scm_mark_space_t **mark_space_ptr; | |
1be6b49c | 418 | static ptrdiff_t current_mark_space_offset; |
d6884e63 ML |
419 | static scm_mark_space_t *mark_space_head; |
420 | ||
421 | static scm_c_bvec_limb_t * | |
422 | get_bvec () | |
db4b4ca6 | 423 | #define FUNC_NAME "get_bvec" |
d6884e63 ML |
424 | { |
425 | scm_c_bvec_limb_t *res; | |
426 | ||
427 | if (!current_mark_space) | |
428 | { | |
429 | SCM_SYSCALL (current_mark_space = (scm_mark_space_t *) malloc (sizeof (scm_mark_space_t))); | |
430 | if (!current_mark_space) | |
db4b4ca6 | 431 | SCM_MISC_ERROR ("could not grow heap", SCM_EOL); |
d6884e63 ML |
432 | |
433 | current_mark_space->bvec_space = NULL; | |
434 | current_mark_space->next = NULL; | |
435 | ||
436 | *mark_space_ptr = current_mark_space; | |
437 | mark_space_ptr = &(current_mark_space->next); | |
438 | ||
439 | return get_bvec (); | |
440 | } | |
441 | ||
442 | if (!(current_mark_space->bvec_space)) | |
443 | { | |
444 | SCM_SYSCALL (current_mark_space->bvec_space = | |
445 | (scm_c_bvec_limb_t *) calloc (BVEC_GROW_SIZE_IN_BYTES, 1)); | |
446 | if (!(current_mark_space->bvec_space)) | |
db4b4ca6 | 447 | SCM_MISC_ERROR ("could not grow heap", SCM_EOL); |
d6884e63 ML |
448 | |
449 | current_mark_space_offset = 0; | |
450 | ||
451 | return get_bvec (); | |
452 | } | |
453 | ||
454 | if (current_mark_space_offset == BVEC_GROW_SIZE_IN_LIMBS) | |
455 | { | |
456 | current_mark_space = NULL; | |
457 | ||
458 | return get_bvec (); | |
459 | } | |
460 | ||
461 | res = current_mark_space->bvec_space + current_mark_space_offset; | |
462 | current_mark_space_offset += SCM_GC_CARD_BVEC_SIZE_IN_LIMBS; | |
463 | ||
464 | return res; | |
465 | } | |
db4b4ca6 DH |
466 | #undef FUNC_NAME |
467 | ||
d6884e63 ML |
468 | |
469 | static void | |
470 | clear_mark_space () | |
471 | { | |
472 | scm_mark_space_t *ms; | |
473 | ||
474 | for (ms = mark_space_head; ms; ms = ms->next) | |
475 | memset (ms->bvec_space, 0, BVEC_GROW_SIZE_IN_BYTES); | |
476 | } | |
477 | ||
478 | ||
0f2d19dd | 479 | \f |
cf2d30f6 JB |
480 | /* Debugging functions. */ |
481 | ||
bb2c57fa | 482 | #if defined (GUILE_DEBUG) || defined (GUILE_DEBUG_FREELIST) |
cf2d30f6 JB |
483 | |
484 | /* Return the number of the heap segment containing CELL. */ | |
c014a02e | 485 | static long |
cf2d30f6 JB |
486 | which_seg (SCM cell) |
487 | { | |
c014a02e | 488 | long i; |
cf2d30f6 JB |
489 | |
490 | for (i = 0; i < scm_n_heap_segs; i++) | |
195e6201 DH |
491 | if (SCM_PTR_LE (scm_heap_table[i].bounds[0], SCM2PTR (cell)) |
492 | && SCM_PTR_GT (scm_heap_table[i].bounds[1], SCM2PTR (cell))) | |
cf2d30f6 | 493 | return i; |
1be6b49c ML |
494 | fprintf (stderr, "which_seg: can't find segment containing cell %lux\n", |
495 | (unsigned long) SCM_UNPACK (cell)); | |
cf2d30f6 JB |
496 | abort (); |
497 | } | |
498 | ||
499 | ||
8ded62a3 MD |
500 | static void |
501 | map_free_list (scm_freelist_t *master, SCM freelist) | |
502 | { | |
c014a02e | 503 | long last_seg = -1, count = 0; |
8ded62a3 | 504 | SCM f; |
a00c95d9 | 505 | |
3f5d82cd | 506 | for (f = freelist; !SCM_NULLP (f); f = SCM_FREE_CELL_CDR (f)) |
8ded62a3 | 507 | { |
c014a02e | 508 | long this_seg = which_seg (f); |
8ded62a3 MD |
509 | |
510 | if (this_seg != last_seg) | |
511 | { | |
512 | if (last_seg != -1) | |
1be6b49c ML |
513 | fprintf (stderr, " %5ld %d-cells in segment %ld\n", |
514 | (long) count, master->span, (long) last_seg); | |
8ded62a3 MD |
515 | last_seg = this_seg; |
516 | count = 0; | |
517 | } | |
518 | count++; | |
519 | } | |
520 | if (last_seg != -1) | |
1be6b49c ML |
521 | fprintf (stderr, " %5ld %d-cells in segment %ld\n", |
522 | (long) count, master->span, (long) last_seg); | |
8ded62a3 | 523 | } |
cf2d30f6 | 524 | |
a00c95d9 | 525 | SCM_DEFINE (scm_map_free_list, "map-free-list", 0, 0, 0, |
acb0a19c | 526 | (), |
5352393c MG |
527 | "Print debugging information about the free-list.\n" |
528 | "@code{map-free-list} is only included in\n" | |
529 | "@code{--enable-guile-debug} builds of Guile.") | |
acb0a19c MD |
530 | #define FUNC_NAME s_scm_map_free_list |
531 | { | |
c014a02e | 532 | long i; |
1be6b49c ML |
533 | fprintf (stderr, "%ld segments total (%d:%ld", |
534 | (long) scm_n_heap_segs, | |
4c48ba06 | 535 | scm_heap_table[0].span, |
1be6b49c | 536 | (long) (scm_heap_table[0].bounds[1] - scm_heap_table[0].bounds[0])); |
4c48ba06 | 537 | for (i = 1; i < scm_n_heap_segs; i++) |
1be6b49c | 538 | fprintf (stderr, ", %d:%ld", |
4c48ba06 | 539 | scm_heap_table[i].span, |
1be6b49c | 540 | (long) (scm_heap_table[i].bounds[1] - scm_heap_table[i].bounds[0])); |
4c48ba06 | 541 | fprintf (stderr, ")\n"); |
8ded62a3 MD |
542 | map_free_list (&scm_master_freelist, scm_freelist); |
543 | map_free_list (&scm_master_freelist2, scm_freelist2); | |
cf2d30f6 JB |
544 | fflush (stderr); |
545 | ||
546 | return SCM_UNSPECIFIED; | |
547 | } | |
1bbd0b84 | 548 | #undef FUNC_NAME |
cf2d30f6 | 549 | |
c014a02e ML |
550 | static long last_cluster; |
551 | static long last_size; | |
4c48ba06 | 552 | |
c014a02e ML |
553 | static long |
554 | free_list_length (char *title, long i, SCM freelist) | |
5384bc5b MD |
555 | { |
556 | SCM ls; | |
c014a02e | 557 | long n = 0; |
3f5d82cd DH |
558 | for (ls = freelist; !SCM_NULLP (ls); ls = SCM_FREE_CELL_CDR (ls)) |
559 | if (SCM_FREE_CELL_P (ls)) | |
5384bc5b MD |
560 | ++n; |
561 | else | |
562 | { | |
1be6b49c | 563 | fprintf (stderr, "bad cell in %s at position %ld\n", title, (long) n); |
5384bc5b MD |
564 | abort (); |
565 | } | |
4c48ba06 MD |
566 | if (n != last_size) |
567 | { | |
568 | if (i > 0) | |
569 | { | |
570 | if (last_cluster == i - 1) | |
1be6b49c | 571 | fprintf (stderr, "\t%ld\n", (long) last_size); |
4c48ba06 | 572 | else |
1be6b49c | 573 | fprintf (stderr, "-%ld\t%ld\n", (long) (i - 1), (long) last_size); |
4c48ba06 MD |
574 | } |
575 | if (i >= 0) | |
1be6b49c | 576 | fprintf (stderr, "%s %ld", title, (long) i); |
4c48ba06 | 577 | else |
1be6b49c | 578 | fprintf (stderr, "%s\t%ld\n", title, (long) n); |
4c48ba06 MD |
579 | last_cluster = i; |
580 | last_size = n; | |
581 | } | |
5384bc5b MD |
582 | return n; |
583 | } | |
584 | ||
585 | static void | |
586 | free_list_lengths (char *title, scm_freelist_t *master, SCM freelist) | |
587 | { | |
588 | SCM clusters; | |
c014a02e | 589 | long i = 0, len, n = 0; |
5384bc5b MD |
590 | fprintf (stderr, "%s\n\n", title); |
591 | n += free_list_length ("free list", -1, freelist); | |
592 | for (clusters = master->clusters; | |
593 | SCM_NNULLP (clusters); | |
594 | clusters = SCM_CDR (clusters)) | |
4c48ba06 MD |
595 | { |
596 | len = free_list_length ("cluster", i++, SCM_CAR (clusters)); | |
597 | n += len; | |
598 | } | |
599 | if (last_cluster == i - 1) | |
1be6b49c | 600 | fprintf (stderr, "\t%ld\n", (long) last_size); |
4c48ba06 | 601 | else |
1be6b49c ML |
602 | fprintf (stderr, "-%ld\t%ld\n", (long) (i - 1), (long) last_size); |
603 | fprintf (stderr, "\ntotal %ld objects\n\n", (long) n); | |
5384bc5b MD |
604 | } |
605 | ||
a00c95d9 | 606 | SCM_DEFINE (scm_free_list_length, "free-list-length", 0, 0, 0, |
5384bc5b | 607 | (), |
5352393c MG |
608 | "Print debugging information about the free-list.\n" |
609 | "@code{free-list-length} is only included in\n" | |
610 | "@code{--enable-guile-debug} builds of Guile.") | |
5384bc5b MD |
611 | #define FUNC_NAME s_scm_free_list_length |
612 | { | |
b37fe1c5 MD |
613 | free_list_lengths ("1-cells", &scm_master_freelist, scm_freelist); |
614 | free_list_lengths ("2-cells", &scm_master_freelist2, scm_freelist2); | |
12e5fb3b | 615 | return SCM_UNSPECIFIED; |
5384bc5b MD |
616 | } |
617 | #undef FUNC_NAME | |
618 | ||
bb2c57fa MD |
619 | #endif |
620 | ||
621 | #ifdef GUILE_DEBUG_FREELIST | |
cf2d30f6 | 622 | |
d3dd80ab MG |
623 | /* Non-zero if freelist debugging is in effect. Set this via |
624 | `gc-set-debug-check-freelist!'. */ | |
625 | static int scm_debug_check_freelist = 0; | |
626 | ||
cf2d30f6 | 627 | /* Number of calls to SCM_NEWCELL since startup. */ |
c014a02e ML |
628 | static unsigned long scm_newcell_count; |
629 | static unsigned long scm_newcell2_count; | |
cf2d30f6 JB |
630 | |
631 | /* Search freelist for anything that isn't marked as a free cell. | |
632 | Abort if we find something. */ | |
8ded62a3 MD |
633 | static void |
634 | scm_check_freelist (SCM freelist) | |
635 | { | |
636 | SCM f; | |
c014a02e | 637 | long i = 0; |
8ded62a3 | 638 | |
3f5d82cd DH |
639 | for (f = freelist; !SCM_NULLP (f); f = SCM_FREE_CELL_CDR (f), i++) |
640 | if (!SCM_FREE_CELL_P (f)) | |
8ded62a3 | 641 | { |
1be6b49c ML |
642 | fprintf (stderr, "Bad cell in freelist on newcell %lu: %lu'th elt\n", |
643 | (long) scm_newcell_count, (long) i); | |
8ded62a3 MD |
644 | abort (); |
645 | } | |
646 | } | |
cf2d30f6 | 647 | |
a00c95d9 | 648 | SCM_DEFINE (scm_gc_set_debug_check_freelist_x, "gc-set-debug-check-freelist!", 1, 0, 0, |
1bbd0b84 | 649 | (SCM flag), |
1e6808ea MG |
650 | "If @var{flag} is @code{#t}, check the freelist for consistency\n" |
651 | "on each cell allocation. This procedure only exists when the\n" | |
652 | "@code{GUILE_DEBUG_FREELIST} compile-time flag was selected.") | |
1bbd0b84 | 653 | #define FUNC_NAME s_scm_gc_set_debug_check_freelist_x |
25748c78 | 654 | { |
d6884e63 ML |
655 | /* [cmm] I did a double-take when I read this code the first time. |
656 | well, FWIW. */ | |
945fec60 | 657 | SCM_VALIDATE_BOOL_COPY (1, flag, scm_debug_check_freelist); |
25748c78 GB |
658 | return SCM_UNSPECIFIED; |
659 | } | |
1bbd0b84 | 660 | #undef FUNC_NAME |
25748c78 GB |
661 | |
662 | ||
4a4c9785 MD |
663 | SCM |
664 | scm_debug_newcell (void) | |
665 | { | |
666 | SCM new; | |
667 | ||
668 | scm_newcell_count++; | |
669 | if (scm_debug_check_freelist) | |
670 | { | |
8ded62a3 | 671 | scm_check_freelist (scm_freelist); |
4a4c9785 MD |
672 | scm_gc(); |
673 | } | |
674 | ||
675 | /* The rest of this is supposed to be identical to the SCM_NEWCELL | |
676 | macro. */ | |
3f5d82cd | 677 | if (SCM_NULLP (scm_freelist)) |
7c33806a DH |
678 | { |
679 | new = scm_gc_for_newcell (&scm_master_freelist, &scm_freelist); | |
680 | SCM_GC_SET_ALLOCATED (new); | |
681 | } | |
4a4c9785 MD |
682 | else |
683 | { | |
684 | new = scm_freelist; | |
3f5d82cd | 685 | scm_freelist = SCM_FREE_CELL_CDR (scm_freelist); |
7c33806a | 686 | SCM_GC_SET_ALLOCATED (new); |
4a4c9785 MD |
687 | } |
688 | ||
689 | return new; | |
690 | } | |
691 | ||
692 | SCM | |
693 | scm_debug_newcell2 (void) | |
694 | { | |
695 | SCM new; | |
696 | ||
697 | scm_newcell2_count++; | |
698 | if (scm_debug_check_freelist) | |
699 | { | |
8ded62a3 | 700 | scm_check_freelist (scm_freelist2); |
4a4c9785 MD |
701 | scm_gc (); |
702 | } | |
703 | ||
704 | /* The rest of this is supposed to be identical to the SCM_NEWCELL | |
705 | macro. */ | |
3f5d82cd | 706 | if (SCM_NULLP (scm_freelist2)) |
7c33806a DH |
707 | { |
708 | new = scm_gc_for_newcell (&scm_master_freelist2, &scm_freelist2); | |
709 | SCM_GC_SET_ALLOCATED (new); | |
710 | } | |
4a4c9785 MD |
711 | else |
712 | { | |
713 | new = scm_freelist2; | |
3f5d82cd | 714 | scm_freelist2 = SCM_FREE_CELL_CDR (scm_freelist2); |
7c33806a | 715 | SCM_GC_SET_ALLOCATED (new); |
4a4c9785 MD |
716 | } |
717 | ||
718 | return new; | |
719 | } | |
720 | ||
fca7547b | 721 | #endif /* GUILE_DEBUG_FREELIST */ |
cf2d30f6 JB |
722 | |
723 | \f | |
0f2d19dd | 724 | |
c014a02e | 725 | static unsigned long |
b37fe1c5 MD |
726 | master_cells_allocated (scm_freelist_t *master) |
727 | { | |
d6884e63 | 728 | /* the '- 1' below is to ignore the cluster spine cells. */ |
c014a02e | 729 | long objects = master->clusters_allocated * (master->cluster_size - 1); |
b37fe1c5 MD |
730 | if (SCM_NULLP (master->clusters)) |
731 | objects -= master->left_to_collect; | |
732 | return master->span * objects; | |
733 | } | |
734 | ||
c014a02e | 735 | static unsigned long |
b37fe1c5 MD |
736 | freelist_length (SCM freelist) |
737 | { | |
c014a02e | 738 | long n; |
3f5d82cd | 739 | for (n = 0; !SCM_NULLP (freelist); freelist = SCM_FREE_CELL_CDR (freelist)) |
b37fe1c5 MD |
740 | ++n; |
741 | return n; | |
742 | } | |
743 | ||
c014a02e | 744 | static unsigned long |
b37fe1c5 MD |
745 | compute_cells_allocated () |
746 | { | |
747 | return (scm_cells_allocated | |
748 | + master_cells_allocated (&scm_master_freelist) | |
749 | + master_cells_allocated (&scm_master_freelist2) | |
750 | - scm_master_freelist.span * freelist_length (scm_freelist) | |
751 | - scm_master_freelist2.span * freelist_length (scm_freelist2)); | |
752 | } | |
b37fe1c5 | 753 | |
0f2d19dd JB |
754 | /* {Scheme Interface to GC} |
755 | */ | |
756 | ||
a00c95d9 | 757 | SCM_DEFINE (scm_gc_stats, "gc-stats", 0, 0, 0, |
1bbd0b84 | 758 | (), |
1e6808ea MG |
759 | "Return an association list of statistics about Guile's current\n" |
760 | "use of storage.") | |
1bbd0b84 | 761 | #define FUNC_NAME s_scm_gc_stats |
0f2d19dd | 762 | { |
c014a02e ML |
763 | long i; |
764 | long n; | |
0f2d19dd | 765 | SCM heap_segs; |
c014a02e ML |
766 | unsigned long int local_scm_mtrigger; |
767 | unsigned long int local_scm_mallocated; | |
768 | unsigned long int local_scm_heap_size; | |
769 | unsigned long int local_scm_cells_allocated; | |
770 | unsigned long int local_scm_gc_time_taken; | |
771 | unsigned long int local_scm_gc_times; | |
772 | unsigned long int local_scm_gc_mark_time_taken; | |
773 | unsigned long int local_scm_gc_sweep_time_taken; | |
c9b0d4b0 ML |
774 | double local_scm_gc_cells_swept; |
775 | double local_scm_gc_cells_marked; | |
0f2d19dd JB |
776 | SCM answer; |
777 | ||
778 | SCM_DEFER_INTS; | |
939794ce DH |
779 | |
780 | ++scm_block_gc; | |
781 | ||
0f2d19dd JB |
782 | retry: |
783 | heap_segs = SCM_EOL; | |
784 | n = scm_n_heap_segs; | |
785 | for (i = scm_n_heap_segs; i--; ) | |
c014a02e ML |
786 | heap_segs = scm_cons (scm_cons (scm_ulong2num ((unsigned long)scm_heap_table[i].bounds[1]), |
787 | scm_ulong2num ((unsigned long)scm_heap_table[i].bounds[0])), | |
0f2d19dd JB |
788 | heap_segs); |
789 | if (scm_n_heap_segs != n) | |
790 | goto retry; | |
939794ce DH |
791 | |
792 | --scm_block_gc; | |
0f2d19dd | 793 | |
7febb4a2 MD |
794 | /* Below, we cons to produce the resulting list. We want a snapshot of |
795 | * the heap situation before consing. | |
796 | */ | |
0f2d19dd JB |
797 | local_scm_mtrigger = scm_mtrigger; |
798 | local_scm_mallocated = scm_mallocated; | |
b37fe1c5 | 799 | local_scm_heap_size = SCM_HEAP_SIZE; |
b37fe1c5 | 800 | local_scm_cells_allocated = compute_cells_allocated (); |
0f2d19dd | 801 | local_scm_gc_time_taken = scm_gc_time_taken; |
c9b0d4b0 ML |
802 | local_scm_gc_mark_time_taken = scm_gc_mark_time_taken; |
803 | local_scm_gc_sweep_time_taken = scm_gc_sweep_time_taken; | |
804 | local_scm_gc_times = scm_gc_times; | |
805 | local_scm_gc_cells_swept = scm_gc_cells_swept_acc; | |
806 | local_scm_gc_cells_marked = scm_gc_cells_marked_acc; | |
0f2d19dd JB |
807 | |
808 | answer = scm_listify (scm_cons (sym_gc_time_taken, scm_ulong2num (local_scm_gc_time_taken)), | |
c014a02e ML |
809 | scm_cons (sym_cells_allocated, scm_ulong2num (local_scm_cells_allocated)), |
810 | scm_cons (sym_heap_size, scm_ulong2num (local_scm_heap_size)), | |
811 | scm_cons (sym_mallocated, scm_ulong2num (local_scm_mallocated)), | |
812 | scm_cons (sym_mtrigger, scm_ulong2num (local_scm_mtrigger)), | |
813 | scm_cons (sym_times, scm_ulong2num (local_scm_gc_times)), | |
c9b0d4b0 ML |
814 | scm_cons (sym_gc_mark_time_taken, scm_ulong2num (local_scm_gc_mark_time_taken)), |
815 | scm_cons (sym_gc_sweep_time_taken, scm_ulong2num (local_scm_gc_sweep_time_taken)), | |
1be6b49c ML |
816 | scm_cons (sym_cells_marked, scm_i_dbl2big (local_scm_gc_cells_marked)), |
817 | scm_cons (sym_cells_swept, scm_i_dbl2big (local_scm_gc_cells_swept)), | |
0f2d19dd JB |
818 | scm_cons (sym_heap_segments, heap_segs), |
819 | SCM_UNDEFINED); | |
820 | SCM_ALLOW_INTS; | |
821 | return answer; | |
822 | } | |
1bbd0b84 | 823 | #undef FUNC_NAME |
0f2d19dd JB |
824 | |
825 | ||
c9b0d4b0 ML |
826 | static void |
827 | gc_start_stats (const char *what) | |
0f2d19dd | 828 | { |
c9b0d4b0 ML |
829 | t_before_gc = scm_c_get_internal_run_time (); |
830 | scm_gc_cells_swept = 0; | |
b37fe1c5 | 831 | scm_gc_cells_collected = 0; |
37ddcaf6 | 832 | scm_gc_yield_1 = scm_gc_yield; |
8b0d194f MD |
833 | scm_gc_yield = (scm_cells_allocated |
834 | + master_cells_allocated (&scm_master_freelist) | |
835 | + master_cells_allocated (&scm_master_freelist2)); | |
0f2d19dd JB |
836 | scm_gc_malloc_collected = 0; |
837 | scm_gc_ports_collected = 0; | |
838 | } | |
839 | ||
939794ce | 840 | |
c9b0d4b0 ML |
841 | static void |
842 | gc_end_stats () | |
0f2d19dd | 843 | { |
c9b0d4b0 ML |
844 | unsigned long t = scm_c_get_internal_run_time (); |
845 | scm_gc_time_taken += (t - t_before_gc); | |
846 | scm_gc_sweep_time_taken += (t - t_before_sweep); | |
847 | ++scm_gc_times; | |
848 | ||
849 | scm_gc_cells_marked_acc += scm_gc_cells_swept - scm_gc_cells_collected; | |
850 | scm_gc_cells_swept_acc += scm_gc_cells_swept; | |
0f2d19dd JB |
851 | } |
852 | ||
853 | ||
a00c95d9 | 854 | SCM_DEFINE (scm_object_address, "object-address", 1, 0, 0, |
1bbd0b84 | 855 | (SCM obj), |
b380b885 MD |
856 | "Return an integer that for the lifetime of @var{obj} is uniquely\n" |
857 | "returned by this function for @var{obj}") | |
1bbd0b84 | 858 | #define FUNC_NAME s_scm_object_address |
0f2d19dd | 859 | { |
c014a02e | 860 | return scm_ulong2num ((unsigned long) SCM_UNPACK (obj)); |
0f2d19dd | 861 | } |
1bbd0b84 | 862 | #undef FUNC_NAME |
0f2d19dd JB |
863 | |
864 | ||
a00c95d9 | 865 | SCM_DEFINE (scm_gc, "gc", 0, 0, 0, |
1bbd0b84 | 866 | (), |
b380b885 MD |
867 | "Scans all of SCM objects and reclaims for further use those that are\n" |
868 | "no longer accessible.") | |
1bbd0b84 | 869 | #define FUNC_NAME s_scm_gc |
0f2d19dd JB |
870 | { |
871 | SCM_DEFER_INTS; | |
872 | scm_igc ("call"); | |
873 | SCM_ALLOW_INTS; | |
874 | return SCM_UNSPECIFIED; | |
875 | } | |
1bbd0b84 | 876 | #undef FUNC_NAME |
0f2d19dd JB |
877 | |
878 | ||
879 | \f | |
880 | /* {C Interface For When GC is Triggered} | |
881 | */ | |
882 | ||
b37fe1c5 | 883 | static void |
8fef55a8 | 884 | adjust_min_yield (scm_freelist_t *freelist) |
b37fe1c5 | 885 | { |
8fef55a8 | 886 | /* min yield is adjusted upwards so that next predicted total yield |
bda1446c | 887 | * (allocated cells actually freed by GC) becomes |
8fef55a8 MD |
888 | * `min_yield_fraction' of total heap size. Note, however, that |
889 | * the absolute value of min_yield will correspond to `collected' | |
bda1446c | 890 | * on one master (the one which currently is triggering GC). |
b37fe1c5 | 891 | * |
bda1446c MD |
892 | * The reason why we look at total yield instead of cells collected |
893 | * on one list is that we want to take other freelists into account. | |
894 | * On this freelist, we know that (local) yield = collected cells, | |
895 | * but that's probably not the case on the other lists. | |
b37fe1c5 MD |
896 | * |
897 | * (We might consider computing a better prediction, for example | |
898 | * by computing an average over multiple GC:s.) | |
899 | */ | |
8fef55a8 | 900 | if (freelist->min_yield_fraction) |
b37fe1c5 | 901 | { |
37ddcaf6 | 902 | /* Pick largest of last two yields. */ |
1be6b49c | 903 | long delta = ((SCM_HEAP_SIZE * freelist->min_yield_fraction / 100) |
8fef55a8 | 904 | - (long) SCM_MAX (scm_gc_yield_1, scm_gc_yield)); |
b37fe1c5 | 905 | #ifdef DEBUGINFO |
1be6b49c ML |
906 | fprintf (stderr, " after GC = %lu, delta = %ld\n", |
907 | (long) scm_cells_allocated, | |
908 | (long) delta); | |
b37fe1c5 MD |
909 | #endif |
910 | if (delta > 0) | |
8fef55a8 | 911 | freelist->min_yield += delta; |
b37fe1c5 MD |
912 | } |
913 | } | |
914 | ||
b6efc951 | 915 | |
4a4c9785 | 916 | /* When we get POSIX threads support, the master will be global and |
4c48ba06 MD |
917 | * common while the freelist will be individual for each thread. |
918 | */ | |
4a4c9785 MD |
919 | |
920 | SCM | |
921 | scm_gc_for_newcell (scm_freelist_t *master, SCM *freelist) | |
922 | { | |
923 | SCM cell; | |
924 | ++scm_ints_disabled; | |
4c48ba06 MD |
925 | do |
926 | { | |
c7387918 | 927 | if (SCM_NULLP (master->clusters)) |
4c48ba06 | 928 | { |
150c200b | 929 | if (master->grow_heap_p || scm_block_gc) |
4c48ba06 | 930 | { |
b6efc951 DH |
931 | /* In order to reduce gc frequency, try to allocate a new heap |
932 | * segment first, even if gc might find some free cells. If we | |
933 | * can't obtain a new heap segment, we will try gc later. | |
934 | */ | |
4c48ba06 | 935 | master->grow_heap_p = 0; |
b6efc951 | 936 | alloc_some_heap (master, return_on_error); |
4c48ba06 | 937 | } |
b6efc951 | 938 | if (SCM_NULLP (master->clusters)) |
b37fe1c5 | 939 | { |
b6efc951 DH |
940 | /* The heap was not grown, either because it wasn't scheduled to |
941 | * grow, or because there was not enough memory available. In | |
942 | * both cases we have to try gc to get some free cells. | |
943 | */ | |
37ddcaf6 | 944 | #ifdef DEBUGINFO |
1be6b49c ML |
945 | fprintf (stderr, "allocated = %lu, ", |
946 | (long) (scm_cells_allocated | |
37ddcaf6 | 947 | + master_cells_allocated (&scm_master_freelist) |
c014a02e | 948 | + master_cells_allocated (&scm_master_freelist2))); |
37ddcaf6 | 949 | #endif |
b37fe1c5 | 950 | scm_igc ("cells"); |
8fef55a8 | 951 | adjust_min_yield (master); |
c7387918 DH |
952 | if (SCM_NULLP (master->clusters)) |
953 | { | |
b6efc951 DH |
954 | /* gc could not free any cells. Now, we _must_ allocate a |
955 | * new heap segment, because there is no other possibility | |
956 | * to provide a new cell for the caller. | |
957 | */ | |
958 | alloc_some_heap (master, abort_on_error); | |
c7387918 | 959 | } |
b37fe1c5 | 960 | } |
4c48ba06 MD |
961 | } |
962 | cell = SCM_CAR (master->clusters); | |
963 | master->clusters = SCM_CDR (master->clusters); | |
b37fe1c5 | 964 | ++master->clusters_allocated; |
4c48ba06 MD |
965 | } |
966 | while (SCM_NULLP (cell)); | |
d6884e63 ML |
967 | |
968 | #ifdef GUILE_DEBUG_FREELIST | |
969 | scm_check_freelist (cell); | |
970 | #endif | |
971 | ||
4a4c9785 | 972 | --scm_ints_disabled; |
3f5d82cd | 973 | *freelist = SCM_FREE_CELL_CDR (cell); |
4a4c9785 MD |
974 | return cell; |
975 | } | |
976 | ||
b6efc951 | 977 | |
4c48ba06 MD |
978 | #if 0 |
979 | /* This is a support routine which can be used to reserve a cluster | |
980 | * for some special use, such as debugging. It won't be useful until | |
981 | * free cells are preserved between garbage collections. | |
982 | */ | |
983 | ||
984 | void | |
985 | scm_alloc_cluster (scm_freelist_t *master) | |
986 | { | |
987 | SCM freelist, cell; | |
988 | cell = scm_gc_for_newcell (master, &freelist); | |
989 | SCM_SETCDR (cell, freelist); | |
990 | return cell; | |
991 | } | |
992 | #endif | |
993 | ||
801cb5e7 MD |
994 | |
995 | scm_c_hook_t scm_before_gc_c_hook; | |
996 | scm_c_hook_t scm_before_mark_c_hook; | |
997 | scm_c_hook_t scm_before_sweep_c_hook; | |
998 | scm_c_hook_t scm_after_sweep_c_hook; | |
999 | scm_c_hook_t scm_after_gc_c_hook; | |
1000 | ||
b6efc951 | 1001 | |
0f2d19dd | 1002 | void |
1bbd0b84 | 1003 | scm_igc (const char *what) |
0f2d19dd | 1004 | { |
c014a02e | 1005 | long j; |
0f2d19dd | 1006 | |
406c7d90 | 1007 | ++scm_gc_running_p; |
801cb5e7 | 1008 | scm_c_hook_run (&scm_before_gc_c_hook, 0); |
4c48ba06 MD |
1009 | #ifdef DEBUGINFO |
1010 | fprintf (stderr, | |
1011 | SCM_NULLP (scm_freelist) | |
1012 | ? "*" | |
1013 | : (SCM_NULLP (scm_freelist2) ? "o" : "m")); | |
1014 | #endif | |
42db06f0 | 1015 | /* During the critical section, only the current thread may run. */ |
216eedfc | 1016 | SCM_CRITICAL_SECTION_START; |
42db06f0 | 1017 | |
e242dfd2 | 1018 | /* fprintf (stderr, "gc: %s\n", what); */ |
c68296f8 | 1019 | |
ab4bef85 JB |
1020 | if (!scm_stack_base || scm_block_gc) |
1021 | { | |
406c7d90 | 1022 | --scm_gc_running_p; |
ab4bef85 JB |
1023 | return; |
1024 | } | |
1025 | ||
c9b0d4b0 ML |
1026 | gc_start_stats (what); |
1027 | ||
ab4bef85 JB |
1028 | if (scm_gc_heap_lock) |
1029 | /* We've invoked the collector while a GC is already in progress. | |
1030 | That should never happen. */ | |
1031 | abort (); | |
0f2d19dd JB |
1032 | |
1033 | ++scm_gc_heap_lock; | |
ab4bef85 | 1034 | |
0f2d19dd JB |
1035 | /* flush dead entries from the continuation stack */ |
1036 | { | |
c014a02e ML |
1037 | long x; |
1038 | long bound; | |
0f2d19dd JB |
1039 | SCM * elts; |
1040 | elts = SCM_VELTS (scm_continuation_stack); | |
b5c2579a | 1041 | bound = SCM_VECTOR_LENGTH (scm_continuation_stack); |
0f2d19dd JB |
1042 | x = SCM_INUM (scm_continuation_stack_ptr); |
1043 | while (x < bound) | |
1044 | { | |
1045 | elts[x] = SCM_BOOL_F; | |
1046 | ++x; | |
1047 | } | |
1048 | } | |
1049 | ||
801cb5e7 MD |
1050 | scm_c_hook_run (&scm_before_mark_c_hook, 0); |
1051 | ||
d6884e63 ML |
1052 | clear_mark_space (); |
1053 | ||
42db06f0 | 1054 | #ifndef USE_THREADS |
a00c95d9 | 1055 | |
1b9be268 | 1056 | /* Mark objects on the C stack. */ |
0f2d19dd JB |
1057 | SCM_FLUSH_REGISTER_WINDOWS; |
1058 | /* This assumes that all registers are saved into the jmp_buf */ | |
1059 | setjmp (scm_save_regs_gc_mark); | |
1060 | scm_mark_locations ((SCM_STACKITEM *) scm_save_regs_gc_mark, | |
1be6b49c | 1061 | ( (size_t) (sizeof (SCM_STACKITEM) - 1 + |
ce4a361d JB |
1062 | sizeof scm_save_regs_gc_mark) |
1063 | / sizeof (SCM_STACKITEM))); | |
0f2d19dd JB |
1064 | |
1065 | { | |
1be6b49c | 1066 | size_t stack_len = scm_stack_size (scm_stack_base); |
0f2d19dd | 1067 | #ifdef SCM_STACK_GROWS_UP |
6ba93e5e | 1068 | scm_mark_locations (scm_stack_base, stack_len); |
0f2d19dd | 1069 | #else |
6ba93e5e | 1070 | scm_mark_locations (scm_stack_base - stack_len, stack_len); |
0f2d19dd JB |
1071 | #endif |
1072 | } | |
1073 | ||
42db06f0 MD |
1074 | #else /* USE_THREADS */ |
1075 | ||
1076 | /* Mark every thread's stack and registers */ | |
945fec60 | 1077 | scm_threads_mark_stacks (); |
42db06f0 MD |
1078 | |
1079 | #endif /* USE_THREADS */ | |
0f2d19dd | 1080 | |
0f2d19dd JB |
1081 | j = SCM_NUM_PROTECTS; |
1082 | while (j--) | |
1083 | scm_gc_mark (scm_sys_protects[j]); | |
1084 | ||
9de33deb MD |
1085 | /* FIXME: we should have a means to register C functions to be run |
1086 | * in different phases of GC | |
a00c95d9 | 1087 | */ |
9de33deb | 1088 | scm_mark_subr_table (); |
a00c95d9 | 1089 | |
42db06f0 MD |
1090 | #ifndef USE_THREADS |
1091 | scm_gc_mark (scm_root->handle); | |
1092 | #endif | |
a00c95d9 | 1093 | |
c9b0d4b0 ML |
1094 | t_before_sweep = scm_c_get_internal_run_time (); |
1095 | scm_gc_mark_time_taken += (t_before_sweep - t_before_gc); | |
1096 | ||
801cb5e7 | 1097 | scm_c_hook_run (&scm_before_sweep_c_hook, 0); |
0493cd89 | 1098 | |
0f2d19dd JB |
1099 | scm_gc_sweep (); |
1100 | ||
801cb5e7 MD |
1101 | scm_c_hook_run (&scm_after_sweep_c_hook, 0); |
1102 | ||
0f2d19dd | 1103 | --scm_gc_heap_lock; |
c9b0d4b0 | 1104 | gc_end_stats (); |
42db06f0 | 1105 | |
216eedfc | 1106 | SCM_CRITICAL_SECTION_END; |
801cb5e7 | 1107 | scm_c_hook_run (&scm_after_gc_c_hook, 0); |
406c7d90 | 1108 | --scm_gc_running_p; |
0f2d19dd JB |
1109 | } |
1110 | ||
1111 | \f | |
939794ce | 1112 | |
a00c95d9 | 1113 | /* {Mark/Sweep} |
0f2d19dd JB |
1114 | */ |
1115 | ||
56495472 ML |
1116 | #define MARK scm_gc_mark |
1117 | #define FNAME "scm_gc_mark" | |
0f2d19dd | 1118 | |
56495472 | 1119 | #endif /*!MARK_DEPENDENCIES*/ |
0f2d19dd JB |
1120 | |
1121 | /* Mark an object precisely. | |
1122 | */ | |
a00c95d9 | 1123 | void |
56495472 ML |
1124 | MARK (SCM p) |
1125 | #define FUNC_NAME FNAME | |
0f2d19dd | 1126 | { |
c014a02e | 1127 | register long i; |
0f2d19dd | 1128 | register SCM ptr; |
61045190 | 1129 | scm_bits_t cell_type; |
0f2d19dd | 1130 | |
56495472 ML |
1131 | #ifndef MARK_DEPENDENCIES |
1132 | # define RECURSE scm_gc_mark | |
1133 | #else | |
1134 | /* go through the usual marking, but not for self-cycles. */ | |
1135 | # define RECURSE(x) do { if ((x) != p) scm_gc_mark (x); } while (0) | |
1136 | #endif | |
0f2d19dd JB |
1137 | ptr = p; |
1138 | ||
56495472 ML |
1139 | #ifdef MARK_DEPENDENCIES |
1140 | goto gc_mark_loop_first_time; | |
1141 | #endif | |
1142 | ||
86d31dfe MV |
1143 | /* A simple hack for debugging. Chose the second branch to get a |
1144 | meaningful backtrace for crashes inside the GC. | |
1145 | */ | |
1146 | #if 1 | |
1147 | #define goto_gc_mark_loop goto gc_mark_loop | |
1148 | #define goto_gc_mark_nimp goto gc_mark_nimp | |
1149 | #else | |
1150 | #define goto_gc_mark_loop RECURSE(ptr); return | |
1151 | #define goto_gc_mark_nimp RECURSE(ptr); return | |
1152 | #endif | |
1153 | ||
0f2d19dd JB |
1154 | gc_mark_loop: |
1155 | if (SCM_IMP (ptr)) | |
1156 | return; | |
1157 | ||
1158 | gc_mark_nimp: | |
56495472 ML |
1159 | |
1160 | #ifdef MARK_DEPENDENCIES | |
0209177b | 1161 | if (SCM_EQ_P (ptr, p)) |
56495472 ML |
1162 | return; |
1163 | ||
1164 | scm_gc_mark (ptr); | |
0209177b | 1165 | return; |
56495472 ML |
1166 | |
1167 | gc_mark_loop_first_time: | |
1168 | #endif | |
9a6976cd | 1169 | |
61045190 | 1170 | #if (SCM_DEBUG_CELL_ACCESSES == 1) || (defined (GUILE_DEBUG_FREELIST)) |
9a6976cd | 1171 | /* We are in debug mode. Check the ptr exhaustively. */ |
61045190 | 1172 | if (!scm_cellp (ptr)) |
db4b4ca6 | 1173 | SCM_MISC_ERROR ("rogue pointer in heap", SCM_EOL); |
9a6976cd DH |
1174 | #else |
1175 | /* In non-debug mode, do at least some cheap testing. */ | |
1176 | if (!SCM_CELLP (ptr)) | |
1177 | SCM_MISC_ERROR ("rogue pointer in heap", SCM_EOL); | |
d6884e63 ML |
1178 | #endif |
1179 | ||
56495472 ML |
1180 | #ifndef MARK_DEPENDENCIES |
1181 | ||
d6884e63 ML |
1182 | if (SCM_GCMARKP (ptr)) |
1183 | return; | |
56495472 | 1184 | |
d6884e63 ML |
1185 | SCM_SETGCMARK (ptr); |
1186 | ||
56495472 ML |
1187 | #endif |
1188 | ||
61045190 DH |
1189 | cell_type = SCM_GC_CELL_TYPE (ptr); |
1190 | switch (SCM_ITAG7 (cell_type)) | |
0f2d19dd JB |
1191 | { |
1192 | case scm_tcs_cons_nimcar: | |
d6884e63 | 1193 | if (SCM_IMP (SCM_CDR (ptr))) |
0f2d19dd JB |
1194 | { |
1195 | ptr = SCM_CAR (ptr); | |
86d31dfe | 1196 | goto_gc_mark_nimp; |
0f2d19dd | 1197 | } |
56495472 | 1198 | RECURSE (SCM_CAR (ptr)); |
d6884e63 | 1199 | ptr = SCM_CDR (ptr); |
86d31dfe | 1200 | goto_gc_mark_nimp; |
0f2d19dd | 1201 | case scm_tcs_cons_imcar: |
d6884e63 | 1202 | ptr = SCM_CDR (ptr); |
86d31dfe | 1203 | goto_gc_mark_loop; |
e641afaf | 1204 | case scm_tc7_pws: |
22a52da1 DH |
1205 | RECURSE (SCM_SETTER (ptr)); |
1206 | ptr = SCM_PROCEDURE (ptr); | |
86d31dfe | 1207 | goto_gc_mark_loop; |
0f2d19dd | 1208 | case scm_tcs_cons_gloc: |
0f2d19dd | 1209 | { |
86d31dfe MV |
1210 | /* Dirk:FIXME:: The following code is super ugly: ptr may be a |
1211 | * struct or a gloc. If it is a gloc, the cell word #0 of ptr | |
1212 | * is the address of a scm_tc16_variable smob. If it is a | |
1213 | * struct, the cell word #0 of ptr is a pointer to a struct | |
1214 | * vtable data region. (The fact that these are accessed in | |
1215 | * the same way restricts the possibilites to change the data | |
1216 | * layout of structs or heap cells.) To discriminate between | |
1217 | * the two, it is guaranteed that the scm_vtable_index_vcell | |
1218 | * element of the prospective vtable is always zero. For a | |
1219 | * gloc, this location has the CDR of the variable smob, which | |
1220 | * is guaranteed to be non-zero. | |
c8045e8d DH |
1221 | */ |
1222 | scm_bits_t word0 = SCM_CELL_WORD_0 (ptr) - scm_tc3_cons_gloc; | |
1223 | scm_bits_t * vtable_data = (scm_bits_t *) word0; /* access as struct */ | |
7445e0e8 | 1224 | if (vtable_data [scm_vtable_index_vcell] != 0) |
0f2d19dd | 1225 | { |
d6884e63 ML |
1226 | /* ptr is a gloc */ |
1227 | SCM gloc_car = SCM_PACK (word0); | |
56495472 | 1228 | RECURSE (gloc_car); |
d6884e63 ML |
1229 | ptr = SCM_CDR (ptr); |
1230 | goto gc_mark_loop; | |
1231 | } | |
1232 | else | |
1233 | { | |
1234 | /* ptr is a struct */ | |
1235 | SCM layout = SCM_PACK (vtable_data [scm_vtable_index_layout]); | |
c014a02e | 1236 | long len = SCM_SYMBOL_LENGTH (layout); |
06ee04b2 | 1237 | char * fields_desc = SCM_SYMBOL_CHARS (layout); |
d6884e63 | 1238 | scm_bits_t * struct_data = (scm_bits_t *) SCM_STRUCT_DATA (ptr); |
7bb8eac7 | 1239 | |
d6884e63 ML |
1240 | if (vtable_data[scm_struct_i_flags] & SCM_STRUCTF_ENTITY) |
1241 | { | |
56495472 ML |
1242 | RECURSE (SCM_PACK (struct_data[scm_struct_i_procedure])); |
1243 | RECURSE (SCM_PACK (struct_data[scm_struct_i_setter])); | |
d6884e63 ML |
1244 | } |
1245 | if (len) | |
1246 | { | |
c014a02e | 1247 | long x; |
7bb8eac7 | 1248 | |
d6884e63 ML |
1249 | for (x = 0; x < len - 2; x += 2, ++struct_data) |
1250 | if (fields_desc[x] == 'p') | |
56495472 | 1251 | RECURSE (SCM_PACK (*struct_data)); |
d6884e63 ML |
1252 | if (fields_desc[x] == 'p') |
1253 | { | |
1254 | if (SCM_LAYOUT_TAILP (fields_desc[x + 1])) | |
56495472 ML |
1255 | for (x = *struct_data++; x; --x, ++struct_data) |
1256 | RECURSE (SCM_PACK (*struct_data)); | |
d6884e63 | 1257 | else |
56495472 | 1258 | RECURSE (SCM_PACK (*struct_data)); |
d6884e63 ML |
1259 | } |
1260 | } | |
1261 | /* mark vtable */ | |
1262 | ptr = SCM_PACK (vtable_data [scm_vtable_index_vtable]); | |
86d31dfe | 1263 | goto_gc_mark_loop; |
0f2d19dd JB |
1264 | } |
1265 | } | |
1266 | break; | |
1267 | case scm_tcs_closures: | |
22a52da1 | 1268 | if (SCM_IMP (SCM_ENV (ptr))) |
0f2d19dd JB |
1269 | { |
1270 | ptr = SCM_CLOSCAR (ptr); | |
86d31dfe | 1271 | goto_gc_mark_nimp; |
0f2d19dd | 1272 | } |
56495472 | 1273 | RECURSE (SCM_CLOSCAR (ptr)); |
22a52da1 | 1274 | ptr = SCM_ENV (ptr); |
86d31dfe | 1275 | goto_gc_mark_nimp; |
0f2d19dd | 1276 | case scm_tc7_vector: |
b5c2579a DH |
1277 | i = SCM_VECTOR_LENGTH (ptr); |
1278 | if (i == 0) | |
1279 | break; | |
1280 | while (--i > 0) | |
1281 | if (SCM_NIMP (SCM_VELTS (ptr)[i])) | |
56495472 | 1282 | RECURSE (SCM_VELTS (ptr)[i]); |
b5c2579a | 1283 | ptr = SCM_VELTS (ptr)[0]; |
86d31dfe | 1284 | goto_gc_mark_loop; |
0f2d19dd JB |
1285 | #ifdef CCLO |
1286 | case scm_tc7_cclo: | |
362306b9 | 1287 | { |
1be6b49c ML |
1288 | size_t i = SCM_CCLO_LENGTH (ptr); |
1289 | size_t j; | |
362306b9 DH |
1290 | for (j = 1; j != i; ++j) |
1291 | { | |
1292 | SCM obj = SCM_CCLO_REF (ptr, j); | |
1293 | if (!SCM_IMP (obj)) | |
56495472 | 1294 | RECURSE (obj); |
362306b9 DH |
1295 | } |
1296 | ptr = SCM_CCLO_REF (ptr, 0); | |
86d31dfe | 1297 | goto_gc_mark_loop; |
362306b9 | 1298 | } |
b5c2579a | 1299 | #endif |
afe5177e | 1300 | #ifdef HAVE_ARRAYS |
0f2d19dd JB |
1301 | case scm_tc7_bvect: |
1302 | case scm_tc7_byvect: | |
1303 | case scm_tc7_ivect: | |
1304 | case scm_tc7_uvect: | |
1305 | case scm_tc7_fvect: | |
1306 | case scm_tc7_dvect: | |
1307 | case scm_tc7_cvect: | |
1308 | case scm_tc7_svect: | |
5c11cc9d | 1309 | #ifdef HAVE_LONG_LONGS |
0f2d19dd JB |
1310 | case scm_tc7_llvect: |
1311 | #endif | |
afe5177e | 1312 | #endif |
0f2d19dd | 1313 | case scm_tc7_string: |
0f2d19dd JB |
1314 | break; |
1315 | ||
1316 | case scm_tc7_substring: | |
0f2d19dd | 1317 | ptr = SCM_CDR (ptr); |
86d31dfe | 1318 | goto_gc_mark_loop; |
0f2d19dd JB |
1319 | |
1320 | case scm_tc7_wvect: | |
ab4bef85 JB |
1321 | SCM_WVECT_GC_CHAIN (ptr) = scm_weak_vectors; |
1322 | scm_weak_vectors = ptr; | |
0f2d19dd JB |
1323 | if (SCM_IS_WHVEC_ANY (ptr)) |
1324 | { | |
c014a02e ML |
1325 | long x; |
1326 | long len; | |
0f2d19dd JB |
1327 | int weak_keys; |
1328 | int weak_values; | |
1329 | ||
b5c2579a | 1330 | len = SCM_VECTOR_LENGTH (ptr); |
0f2d19dd JB |
1331 | weak_keys = SCM_IS_WHVEC (ptr) || SCM_IS_WHVEC_B (ptr); |
1332 | weak_values = SCM_IS_WHVEC_V (ptr) || SCM_IS_WHVEC_B (ptr); | |
a00c95d9 | 1333 | |
0f2d19dd JB |
1334 | for (x = 0; x < len; ++x) |
1335 | { | |
1336 | SCM alist; | |
1337 | alist = SCM_VELTS (ptr)[x]; | |
46408039 JB |
1338 | |
1339 | /* mark everything on the alist except the keys or | |
1340 | * values, according to weak_values and weak_keys. */ | |
0b5f3f34 | 1341 | while ( SCM_CONSP (alist) |
0f2d19dd | 1342 | && !SCM_GCMARKP (alist) |
0f2d19dd JB |
1343 | && SCM_CONSP (SCM_CAR (alist))) |
1344 | { | |
1345 | SCM kvpair; | |
1346 | SCM next_alist; | |
1347 | ||
1348 | kvpair = SCM_CAR (alist); | |
1349 | next_alist = SCM_CDR (alist); | |
a00c95d9 | 1350 | /* |
0f2d19dd JB |
1351 | * Do not do this: |
1352 | * SCM_SETGCMARK (alist); | |
1353 | * SCM_SETGCMARK (kvpair); | |
1354 | * | |
1355 | * It may be that either the key or value is protected by | |
1356 | * an escaped reference to part of the spine of this alist. | |
1357 | * If we mark the spine here, and only mark one or neither of the | |
1358 | * key and value, they may never be properly marked. | |
1359 | * This leads to a horrible situation in which an alist containing | |
1360 | * freelist cells is exported. | |
1361 | * | |
1362 | * So only mark the spines of these arrays last of all marking. | |
1363 | * If somebody confuses us by constructing a weak vector | |
1364 | * with a circular alist then we are hosed, but at least we | |
1365 | * won't prematurely drop table entries. | |
1366 | */ | |
1367 | if (!weak_keys) | |
56495472 | 1368 | RECURSE (SCM_CAR (kvpair)); |
0f2d19dd | 1369 | if (!weak_values) |
56495472 | 1370 | RECURSE (SCM_CDR (kvpair)); |
0f2d19dd JB |
1371 | alist = next_alist; |
1372 | } | |
1373 | if (SCM_NIMP (alist)) | |
56495472 | 1374 | RECURSE (alist); |
0f2d19dd JB |
1375 | } |
1376 | } | |
1377 | break; | |
1378 | ||
28b06554 DH |
1379 | case scm_tc7_symbol: |
1380 | ptr = SCM_PROP_SLOTS (ptr); | |
86d31dfe | 1381 | goto_gc_mark_loop; |
0f2d19dd | 1382 | case scm_tcs_subrs: |
9de33deb | 1383 | break; |
0f2d19dd JB |
1384 | case scm_tc7_port: |
1385 | i = SCM_PTOBNUM (ptr); | |
7a7f7c53 | 1386 | #if (SCM_DEBUG_CELL_ACCESSES == 1) || (defined (GUILE_DEBUG_FREELIST)) |
0f2d19dd | 1387 | if (!(i < scm_numptob)) |
7a7f7c53 DH |
1388 | SCM_MISC_ERROR ("undefined port type", SCM_EOL); |
1389 | #endif | |
ebf7394e | 1390 | if (SCM_PTAB_ENTRY(ptr)) |
56495472 | 1391 | RECURSE (SCM_FILENAME (ptr)); |
dc53f026 JB |
1392 | if (scm_ptobs[i].mark) |
1393 | { | |
1394 | ptr = (scm_ptobs[i].mark) (ptr); | |
86d31dfe | 1395 | goto_gc_mark_loop; |
dc53f026 JB |
1396 | } |
1397 | else | |
1398 | return; | |
0f2d19dd JB |
1399 | break; |
1400 | case scm_tc7_smob: | |
d6884e63 | 1401 | switch (SCM_TYP16 (ptr)) |
0f2d19dd JB |
1402 | { /* should be faster than going through scm_smobs */ |
1403 | case scm_tc_free_cell: | |
1404 | /* printf("found free_cell %X ", ptr); fflush(stdout); */ | |
acb0a19c MD |
1405 | case scm_tc16_big: |
1406 | case scm_tc16_real: | |
1407 | case scm_tc16_complex: | |
0f2d19dd JB |
1408 | break; |
1409 | default: | |
1410 | i = SCM_SMOBNUM (ptr); | |
7a7f7c53 | 1411 | #if (SCM_DEBUG_CELL_ACCESSES == 1) || (defined (GUILE_DEBUG_FREELIST)) |
0f2d19dd | 1412 | if (!(i < scm_numsmob)) |
7a7f7c53 DH |
1413 | SCM_MISC_ERROR ("undefined smob type", SCM_EOL); |
1414 | #endif | |
dc53f026 JB |
1415 | if (scm_smobs[i].mark) |
1416 | { | |
1417 | ptr = (scm_smobs[i].mark) (ptr); | |
86d31dfe | 1418 | goto_gc_mark_loop; |
dc53f026 JB |
1419 | } |
1420 | else | |
1421 | return; | |
0f2d19dd JB |
1422 | } |
1423 | break; | |
1424 | default: | |
acf4331f | 1425 | SCM_MISC_ERROR ("unknown type", SCM_EOL); |
0f2d19dd | 1426 | } |
0209177b | 1427 | #undef RECURSE |
0f2d19dd | 1428 | } |
acf4331f | 1429 | #undef FUNC_NAME |
0f2d19dd | 1430 | |
56495472 ML |
1431 | #ifndef MARK_DEPENDENCIES |
1432 | ||
1433 | #undef MARK | |
56495472 ML |
1434 | #undef FNAME |
1435 | ||
1436 | /* And here we define `scm_gc_mark_dependencies', by including this | |
1437 | * same file in itself. | |
1438 | */ | |
1439 | #define MARK scm_gc_mark_dependencies | |
1440 | #define FNAME "scm_gc_mark_dependencies" | |
1441 | #define MARK_DEPENDENCIES | |
1442 | #include "gc.c" | |
1443 | #undef MARK_DEPENDENCIES | |
1444 | #undef MARK | |
56495472 ML |
1445 | #undef FNAME |
1446 | ||
0f2d19dd JB |
1447 | |
1448 | /* Mark a Region Conservatively | |
1449 | */ | |
1450 | ||
a00c95d9 | 1451 | void |
c014a02e | 1452 | scm_mark_locations (SCM_STACKITEM x[], unsigned long n) |
0f2d19dd | 1453 | { |
c014a02e | 1454 | unsigned long m; |
0f2d19dd | 1455 | |
c4da09e2 DH |
1456 | for (m = 0; m < n; ++m) |
1457 | { | |
1458 | SCM obj = * (SCM *) &x[m]; | |
1459 | if (SCM_CELLP (obj)) | |
1460 | { | |
1461 | SCM_CELLPTR ptr = SCM2PTR (obj); | |
c014a02e ML |
1462 | long i = 0; |
1463 | long j = scm_n_heap_segs - 1; | |
c4da09e2 DH |
1464 | if (SCM_PTR_LE (scm_heap_table[i].bounds[0], ptr) |
1465 | && SCM_PTR_GT (scm_heap_table[j].bounds[1], ptr)) | |
1466 | { | |
1467 | while (i <= j) | |
1468 | { | |
c014a02e | 1469 | long seg_id; |
c4da09e2 DH |
1470 | seg_id = -1; |
1471 | if ((i == j) | |
1472 | || SCM_PTR_GT (scm_heap_table[i].bounds[1], ptr)) | |
1473 | seg_id = i; | |
1474 | else if (SCM_PTR_LE (scm_heap_table[j].bounds[0], ptr)) | |
1475 | seg_id = j; | |
1476 | else | |
1477 | { | |
c014a02e | 1478 | long k; |
c4da09e2 DH |
1479 | k = (i + j) / 2; |
1480 | if (k == i) | |
1481 | break; | |
1482 | if (SCM_PTR_GT (scm_heap_table[k].bounds[1], ptr)) | |
1483 | { | |
1484 | j = k; | |
1485 | ++i; | |
1486 | if (SCM_PTR_LE (scm_heap_table[i].bounds[0], ptr)) | |
1487 | continue; | |
1488 | else | |
1489 | break; | |
1490 | } | |
1491 | else if (SCM_PTR_LE (scm_heap_table[k].bounds[0], ptr)) | |
1492 | { | |
1493 | i = k; | |
1494 | --j; | |
1495 | if (SCM_PTR_GT (scm_heap_table[j].bounds[1], ptr)) | |
1496 | continue; | |
1497 | else | |
1498 | break; | |
1499 | } | |
1500 | } | |
7bb8eac7 | 1501 | |
d6884e63 ML |
1502 | if (SCM_GC_IN_CARD_HEADERP (ptr)) |
1503 | break; | |
7bb8eac7 | 1504 | |
c4da09e2 | 1505 | if (scm_heap_table[seg_id].span == 1 |
ecf470a2 | 1506 | || DOUBLECELL_ALIGNED_P (obj)) |
3731149d ML |
1507 | scm_gc_mark (obj); |
1508 | ||
c4da09e2 DH |
1509 | break; |
1510 | } | |
1511 | } | |
1512 | } | |
1513 | } | |
0f2d19dd JB |
1514 | } |
1515 | ||
1516 | ||
1a548472 DH |
1517 | /* The function scm_cellp determines whether an SCM value can be regarded as a |
1518 | * pointer to a cell on the heap. Binary search is used in order to determine | |
1519 | * the heap segment that contains the cell. | |
1520 | */ | |
2e11a577 | 1521 | int |
6e8d25a6 | 1522 | scm_cellp (SCM value) |
2e11a577 | 1523 | { |
1a548472 DH |
1524 | if (SCM_CELLP (value)) { |
1525 | scm_cell * ptr = SCM2PTR (value); | |
c014a02e ML |
1526 | unsigned long i = 0; |
1527 | unsigned long j = scm_n_heap_segs - 1; | |
1a548472 | 1528 | |
61045190 DH |
1529 | if (SCM_GC_IN_CARD_HEADERP (ptr)) |
1530 | return 0; | |
1531 | ||
1a548472 | 1532 | while (i < j) { |
c014a02e | 1533 | long k = (i + j) / 2; |
1a548472 DH |
1534 | if (SCM_PTR_GT (scm_heap_table[k].bounds[1], ptr)) { |
1535 | j = k; | |
1536 | } else if (SCM_PTR_LE (scm_heap_table[k].bounds[0], ptr)) { | |
1537 | i = k + 1; | |
1538 | } | |
1539 | } | |
2e11a577 | 1540 | |
9d47a1e6 | 1541 | if (SCM_PTR_LE (scm_heap_table[i].bounds[0], ptr) |
1a548472 | 1542 | && SCM_PTR_GT (scm_heap_table[i].bounds[1], ptr) |
ecf470a2 | 1543 | && (scm_heap_table[i].span == 1 || DOUBLECELL_ALIGNED_P (value)) |
d6884e63 ML |
1544 | && !SCM_GC_IN_CARD_HEADERP (ptr) |
1545 | ) | |
1a548472 | 1546 | return 1; |
d6884e63 | 1547 | else |
1a548472 | 1548 | return 0; |
d6884e63 | 1549 | } else |
1a548472 | 1550 | return 0; |
2e11a577 MD |
1551 | } |
1552 | ||
1553 | ||
4c48ba06 MD |
1554 | static void |
1555 | gc_sweep_freelist_start (scm_freelist_t *freelist) | |
1556 | { | |
1557 | freelist->cells = SCM_EOL; | |
1558 | freelist->left_to_collect = freelist->cluster_size; | |
b37fe1c5 | 1559 | freelist->clusters_allocated = 0; |
4c48ba06 MD |
1560 | freelist->clusters = SCM_EOL; |
1561 | freelist->clustertail = &freelist->clusters; | |
1811ebce | 1562 | freelist->collected_1 = freelist->collected; |
4c48ba06 MD |
1563 | freelist->collected = 0; |
1564 | } | |
1565 | ||
1566 | static void | |
1567 | gc_sweep_freelist_finish (scm_freelist_t *freelist) | |
1568 | { | |
c014a02e | 1569 | long collected; |
4c48ba06 | 1570 | *freelist->clustertail = freelist->cells; |
3f5d82cd | 1571 | if (!SCM_NULLP (freelist->cells)) |
4c48ba06 MD |
1572 | { |
1573 | SCM c = freelist->cells; | |
22a52da1 DH |
1574 | SCM_SET_CELL_WORD_0 (c, SCM_FREE_CELL_CDR (c)); |
1575 | SCM_SET_CELL_WORD_1 (c, SCM_EOL); | |
4c48ba06 MD |
1576 | freelist->collected += |
1577 | freelist->span * (freelist->cluster_size - freelist->left_to_collect); | |
1578 | } | |
b37fe1c5 | 1579 | scm_gc_cells_collected += freelist->collected; |
a00c95d9 | 1580 | |
8fef55a8 | 1581 | /* Although freelist->min_yield is used to test freelist->collected |
7dbff8b1 | 1582 | * (which is the local GC yield for freelist), it is adjusted so |
8fef55a8 | 1583 | * that *total* yield is freelist->min_yield_fraction of total heap |
7dbff8b1 MD |
1584 | * size. This means that a too low yield is compensated by more |
1585 | * heap on the list which is currently doing most work, which is | |
1586 | * just what we want. | |
1587 | */ | |
1811ebce | 1588 | collected = SCM_MAX (freelist->collected_1, freelist->collected); |
8fef55a8 | 1589 | freelist->grow_heap_p = (collected < freelist->min_yield); |
4c48ba06 | 1590 | } |
0f2d19dd | 1591 | |
d6884e63 ML |
1592 | #define NEXT_DATA_CELL(ptr, span) \ |
1593 | do { \ | |
1594 | scm_cell *nxt__ = CELL_UP ((char *) (ptr) + 1, (span)); \ | |
1595 | (ptr) = (SCM_GC_IN_CARD_HEADERP (nxt__) ? \ | |
1596 | CELL_UP (SCM_GC_CELL_CARD (nxt__) + SCM_GC_CARD_N_HEADER_CELLS, span) \ | |
1597 | : nxt__); \ | |
1598 | } while (0) | |
1599 | ||
a00c95d9 | 1600 | void |
0f2d19dd | 1601 | scm_gc_sweep () |
acf4331f | 1602 | #define FUNC_NAME "scm_gc_sweep" |
0f2d19dd JB |
1603 | { |
1604 | register SCM_CELLPTR ptr; | |
0f2d19dd | 1605 | register SCM nfreelist; |
4c48ba06 | 1606 | register scm_freelist_t *freelist; |
c014a02e | 1607 | register unsigned long m; |
0f2d19dd | 1608 | register int span; |
c014a02e | 1609 | long i; |
1be6b49c | 1610 | size_t seg_size; |
0f2d19dd | 1611 | |
0f2d19dd | 1612 | m = 0; |
0f2d19dd | 1613 | |
4c48ba06 MD |
1614 | gc_sweep_freelist_start (&scm_master_freelist); |
1615 | gc_sweep_freelist_start (&scm_master_freelist2); | |
a00c95d9 | 1616 | |
cf2d30f6 | 1617 | for (i = 0; i < scm_n_heap_segs; i++) |
0f2d19dd | 1618 | { |
c014a02e | 1619 | register long left_to_collect; |
1be6b49c | 1620 | register size_t j; |
15e9d186 | 1621 | |
cf2d30f6 JB |
1622 | /* Unmarked cells go onto the front of the freelist this heap |
1623 | segment points to. Rather than updating the real freelist | |
1624 | pointer as we go along, we accumulate the new head in | |
1625 | nfreelist. Then, if it turns out that the entire segment is | |
1626 | free, we free (i.e., malloc's free) the whole segment, and | |
1627 | simply don't assign nfreelist back into the real freelist. */ | |
4c48ba06 MD |
1628 | freelist = scm_heap_table[i].freelist; |
1629 | nfreelist = freelist->cells; | |
4c48ba06 | 1630 | left_to_collect = freelist->left_to_collect; |
945fec60 | 1631 | span = scm_heap_table[i].span; |
cf2d30f6 | 1632 | |
a00c95d9 ML |
1633 | ptr = CELL_UP (scm_heap_table[i].bounds[0], span); |
1634 | seg_size = CELL_DN (scm_heap_table[i].bounds[1], span) - ptr; | |
c9b0d4b0 | 1635 | |
d6884e63 ML |
1636 | /* use only data cells in seg_size */ |
1637 | seg_size = (seg_size / SCM_GC_CARD_N_CELLS) * (SCM_GC_CARD_N_DATA_CELLS / span) * span; | |
1638 | ||
c9b0d4b0 ML |
1639 | scm_gc_cells_swept += seg_size; |
1640 | ||
0f2d19dd JB |
1641 | for (j = seg_size + span; j -= span; ptr += span) |
1642 | { | |
d6884e63 | 1643 | SCM scmptr; |
96f6f4ae | 1644 | |
d6884e63 | 1645 | if (SCM_GC_IN_CARD_HEADERP (ptr)) |
0f2d19dd | 1646 | { |
d6884e63 ML |
1647 | SCM_CELLPTR nxt; |
1648 | ||
1649 | /* cheat here */ | |
1650 | nxt = ptr; | |
1651 | NEXT_DATA_CELL (nxt, span); | |
1652 | j += span; | |
1653 | ||
1654 | ptr = nxt - span; | |
1655 | continue; | |
1656 | } | |
1657 | ||
1658 | scmptr = PTR2SCM (ptr); | |
1659 | ||
1660 | if (SCM_GCMARKP (scmptr)) | |
1661 | continue; | |
7bb8eac7 | 1662 | |
d6884e63 ML |
1663 | switch SCM_TYP7 (scmptr) |
1664 | { | |
0f2d19dd | 1665 | case scm_tcs_cons_gloc: |
0f2d19dd | 1666 | { |
c8045e8d DH |
1667 | /* Dirk:FIXME:: Again, super ugly code: scmptr may be a |
1668 | * struct or a gloc. See the corresponding comment in | |
1669 | * scm_gc_mark. | |
1670 | */ | |
7445e0e8 MD |
1671 | scm_bits_t word0 = (SCM_CELL_WORD_0 (scmptr) |
1672 | - scm_tc3_cons_gloc); | |
1673 | /* access as struct */ | |
1674 | scm_bits_t * vtable_data = (scm_bits_t *) word0; | |
d6884e63 | 1675 | if (vtable_data[scm_vtable_index_vcell] == 0) |
0f2d19dd | 1676 | { |
7445e0e8 MD |
1677 | /* Structs need to be freed in a special order. |
1678 | * This is handled by GC C hooks in struct.c. | |
1679 | */ | |
1680 | SCM_SET_STRUCT_GC_CHAIN (scmptr, scm_structs_to_free); | |
1681 | scm_structs_to_free = scmptr; | |
7bb8eac7 | 1682 | continue; |
c8045e8d | 1683 | } |
7445e0e8 | 1684 | /* fall through so that scmptr gets collected */ |
0f2d19dd JB |
1685 | } |
1686 | break; | |
1687 | case scm_tcs_cons_imcar: | |
1688 | case scm_tcs_cons_nimcar: | |
1689 | case scm_tcs_closures: | |
e641afaf | 1690 | case scm_tc7_pws: |
0f2d19dd JB |
1691 | break; |
1692 | case scm_tc7_wvect: | |
b5c2579a | 1693 | m += (2 + SCM_VECTOR_LENGTH (scmptr)) * sizeof (SCM); |
06ee04b2 | 1694 | scm_must_free (SCM_VECTOR_BASE (scmptr) - 2); |
d6884e63 | 1695 | break; |
0f2d19dd | 1696 | case scm_tc7_vector: |
1b9be268 | 1697 | { |
c014a02e | 1698 | unsigned long int length = SCM_VECTOR_LENGTH (scmptr); |
1b9be268 DH |
1699 | if (length > 0) |
1700 | { | |
1701 | m += length * sizeof (scm_bits_t); | |
1702 | scm_must_free (SCM_VECTOR_BASE (scmptr)); | |
1703 | } | |
1704 | break; | |
1705 | } | |
0f2d19dd JB |
1706 | #ifdef CCLO |
1707 | case scm_tc7_cclo: | |
b5c2579a | 1708 | m += (SCM_CCLO_LENGTH (scmptr) * sizeof (SCM)); |
06ee04b2 | 1709 | scm_must_free (SCM_CCLO_BASE (scmptr)); |
0f2d19dd | 1710 | break; |
06ee04b2 | 1711 | #endif |
afe5177e | 1712 | #ifdef HAVE_ARRAYS |
0f2d19dd | 1713 | case scm_tc7_bvect: |
93778877 | 1714 | { |
c014a02e | 1715 | unsigned long int length = SCM_BITVECTOR_LENGTH (scmptr); |
93778877 DH |
1716 | if (length > 0) |
1717 | { | |
c014a02e | 1718 | m += sizeof (long) * ((length + SCM_LONG_BIT - 1) / SCM_LONG_BIT); |
93778877 DH |
1719 | scm_must_free (SCM_BITVECTOR_BASE (scmptr)); |
1720 | } | |
1721 | } | |
06ee04b2 | 1722 | break; |
0f2d19dd | 1723 | case scm_tc7_byvect: |
0f2d19dd JB |
1724 | case scm_tc7_ivect: |
1725 | case scm_tc7_uvect: | |
0f2d19dd | 1726 | case scm_tc7_svect: |
5c11cc9d | 1727 | #ifdef HAVE_LONG_LONGS |
0f2d19dd | 1728 | case scm_tc7_llvect: |
0f2d19dd JB |
1729 | #endif |
1730 | case scm_tc7_fvect: | |
0f2d19dd | 1731 | case scm_tc7_dvect: |
0f2d19dd | 1732 | case scm_tc7_cvect: |
d1ca2c64 | 1733 | m += SCM_UVECTOR_LENGTH (scmptr) * scm_uniform_element_size (scmptr); |
06ee04b2 DH |
1734 | scm_must_free (SCM_UVECTOR_BASE (scmptr)); |
1735 | break; | |
afe5177e | 1736 | #endif |
0f2d19dd | 1737 | case scm_tc7_substring: |
0f2d19dd JB |
1738 | break; |
1739 | case scm_tc7_string: | |
b5c2579a | 1740 | m += SCM_STRING_LENGTH (scmptr) + 1; |
f151f912 DH |
1741 | scm_must_free (SCM_STRING_CHARS (scmptr)); |
1742 | break; | |
28b06554 | 1743 | case scm_tc7_symbol: |
b5c2579a | 1744 | m += SCM_SYMBOL_LENGTH (scmptr) + 1; |
f151f912 | 1745 | scm_must_free (SCM_SYMBOL_CHARS (scmptr)); |
0f2d19dd | 1746 | break; |
0f2d19dd | 1747 | case scm_tcs_subrs: |
d6884e63 | 1748 | /* the various "subrs" (primitives) are never freed */ |
0f2d19dd JB |
1749 | continue; |
1750 | case scm_tc7_port: | |
0f2d19dd JB |
1751 | if SCM_OPENP (scmptr) |
1752 | { | |
1753 | int k = SCM_PTOBNUM (scmptr); | |
7a7f7c53 | 1754 | #if (SCM_DEBUG_CELL_ACCESSES == 1) || (defined (GUILE_DEBUG_FREELIST)) |
0f2d19dd | 1755 | if (!(k < scm_numptob)) |
7a7f7c53 DH |
1756 | SCM_MISC_ERROR ("undefined port type", SCM_EOL); |
1757 | #endif | |
0f2d19dd | 1758 | /* Keep "revealed" ports alive. */ |
945fec60 | 1759 | if (scm_revealed_count (scmptr) > 0) |
0f2d19dd JB |
1760 | continue; |
1761 | /* Yes, I really do mean scm_ptobs[k].free */ | |
1762 | /* rather than ftobs[k].close. .close */ | |
1763 | /* is for explicit CLOSE-PORT by user */ | |
84af0382 | 1764 | m += (scm_ptobs[k].free) (scmptr); |
0f2d19dd JB |
1765 | SCM_SETSTREAM (scmptr, 0); |
1766 | scm_remove_from_port_table (scmptr); | |
1767 | scm_gc_ports_collected++; | |
22a52da1 | 1768 | SCM_CLR_PORT_OPEN_FLAG (scmptr); |
0f2d19dd JB |
1769 | } |
1770 | break; | |
1771 | case scm_tc7_smob: | |
d6884e63 | 1772 | switch SCM_TYP16 (scmptr) |
0f2d19dd JB |
1773 | { |
1774 | case scm_tc_free_cell: | |
acb0a19c | 1775 | case scm_tc16_real: |
0f2d19dd JB |
1776 | break; |
1777 | #ifdef SCM_BIGDIG | |
acb0a19c | 1778 | case scm_tc16_big: |
0f2d19dd | 1779 | m += (SCM_NUMDIGS (scmptr) * SCM_BITSPERDIG / SCM_CHAR_BIT); |
06ee04b2 DH |
1780 | scm_must_free (SCM_BDIGITS (scmptr)); |
1781 | break; | |
0f2d19dd | 1782 | #endif /* def SCM_BIGDIG */ |
acb0a19c | 1783 | case scm_tc16_complex: |
06ee04b2 | 1784 | m += sizeof (scm_complex_t); |
405aaef9 | 1785 | scm_must_free (SCM_COMPLEX_MEM (scmptr)); |
06ee04b2 | 1786 | break; |
0f2d19dd | 1787 | default: |
0f2d19dd JB |
1788 | { |
1789 | int k; | |
1790 | k = SCM_SMOBNUM (scmptr); | |
7a7f7c53 | 1791 | #if (SCM_DEBUG_CELL_ACCESSES == 1) || (defined (GUILE_DEBUG_FREELIST)) |
0f2d19dd | 1792 | if (!(k < scm_numsmob)) |
7a7f7c53 DH |
1793 | SCM_MISC_ERROR ("undefined smob type", SCM_EOL); |
1794 | #endif | |
1795 | if (scm_smobs[k].free) | |
1796 | m += (scm_smobs[k].free) (scmptr); | |
0f2d19dd JB |
1797 | break; |
1798 | } | |
1799 | } | |
1800 | break; | |
1801 | default: | |
acf4331f | 1802 | SCM_MISC_ERROR ("unknown type", SCM_EOL); |
0f2d19dd | 1803 | } |
7bb8eac7 | 1804 | |
4c48ba06 | 1805 | if (!--left_to_collect) |
4a4c9785 | 1806 | { |
22a52da1 | 1807 | SCM_SET_CELL_WORD_0 (scmptr, nfreelist); |
4c48ba06 MD |
1808 | *freelist->clustertail = scmptr; |
1809 | freelist->clustertail = SCM_CDRLOC (scmptr); | |
a00c95d9 | 1810 | |
4a4c9785 | 1811 | nfreelist = SCM_EOL; |
4c48ba06 MD |
1812 | freelist->collected += span * freelist->cluster_size; |
1813 | left_to_collect = freelist->cluster_size; | |
4a4c9785 MD |
1814 | } |
1815 | else | |
4a4c9785 MD |
1816 | { |
1817 | /* Stick the new cell on the front of nfreelist. It's | |
1818 | critical that we mark this cell as freed; otherwise, the | |
1819 | conservative collector might trace it as some other type | |
1820 | of object. */ | |
54778cd3 | 1821 | SCM_SET_CELL_TYPE (scmptr, scm_tc_free_cell); |
3f5d82cd | 1822 | SCM_SET_FREE_CELL_CDR (scmptr, nfreelist); |
4a4c9785 MD |
1823 | nfreelist = scmptr; |
1824 | } | |
0f2d19dd | 1825 | } |
d6884e63 | 1826 | |
0f2d19dd JB |
1827 | #ifdef GC_FREE_SEGMENTS |
1828 | if (n == seg_size) | |
1829 | { | |
c014a02e | 1830 | register long j; |
15e9d186 | 1831 | |
4c48ba06 | 1832 | freelist->heap_size -= seg_size; |
cf2d30f6 JB |
1833 | free ((char *) scm_heap_table[i].bounds[0]); |
1834 | scm_heap_table[i].bounds[0] = 0; | |
1835 | for (j = i + 1; j < scm_n_heap_segs; j++) | |
0f2d19dd JB |
1836 | scm_heap_table[j - 1] = scm_heap_table[j]; |
1837 | scm_n_heap_segs -= 1; | |
cf2d30f6 | 1838 | i--; /* We need to scan the segment just moved. */ |
0f2d19dd JB |
1839 | } |
1840 | else | |
1841 | #endif /* ifdef GC_FREE_SEGMENTS */ | |
4a4c9785 MD |
1842 | { |
1843 | /* Update the real freelist pointer to point to the head of | |
1844 | the list of free cells we've built for this segment. */ | |
4c48ba06 | 1845 | freelist->cells = nfreelist; |
4c48ba06 | 1846 | freelist->left_to_collect = left_to_collect; |
4a4c9785 MD |
1847 | } |
1848 | ||
fca7547b | 1849 | #ifdef GUILE_DEBUG_FREELIST |
cf2d30f6 JB |
1850 | scm_map_free_list (); |
1851 | #endif | |
4a4c9785 | 1852 | } |
a00c95d9 | 1853 | |
4c48ba06 MD |
1854 | gc_sweep_freelist_finish (&scm_master_freelist); |
1855 | gc_sweep_freelist_finish (&scm_master_freelist2); | |
a00c95d9 | 1856 | |
8ded62a3 MD |
1857 | /* When we move to POSIX threads private freelists should probably |
1858 | be GC-protected instead. */ | |
1859 | scm_freelist = SCM_EOL; | |
1860 | scm_freelist2 = SCM_EOL; | |
a00c95d9 | 1861 | |
b37fe1c5 | 1862 | scm_cells_allocated = (SCM_HEAP_SIZE - scm_gc_cells_collected); |
8b0d194f | 1863 | scm_gc_yield -= scm_cells_allocated; |
1be6b49c ML |
1864 | |
1865 | if (scm_mallocated < m) | |
1866 | /* The byte count of allocated objects has underflowed. This is | |
1867 | probably because you forgot to report the sizes of objects you | |
1868 | have allocated, by calling scm_done_malloc or some such. When | |
1869 | the GC freed them, it subtracted their size from | |
1870 | scm_mallocated, which underflowed. */ | |
1871 | abort (); | |
1872 | ||
0f2d19dd JB |
1873 | scm_mallocated -= m; |
1874 | scm_gc_malloc_collected = m; | |
1875 | } | |
acf4331f | 1876 | #undef FUNC_NAME |
0f2d19dd JB |
1877 | |
1878 | ||
1879 | \f | |
0f2d19dd JB |
1880 | /* {Front end to malloc} |
1881 | * | |
9d47a1e6 ML |
1882 | * scm_must_malloc, scm_must_realloc, scm_must_free, scm_done_malloc, |
1883 | * scm_done_free | |
0f2d19dd | 1884 | * |
c6c79933 GH |
1885 | * These functions provide services comparable to malloc, realloc, and |
1886 | * free. They should be used when allocating memory that will be under | |
1887 | * control of the garbage collector, i.e., if the memory may be freed | |
1888 | * during garbage collection. | |
1889 | */ | |
bc9d9bb2 | 1890 | |
0f2d19dd JB |
1891 | /* scm_must_malloc |
1892 | * Return newly malloced storage or throw an error. | |
1893 | * | |
1894 | * The parameter WHAT is a string for error reporting. | |
a00c95d9 | 1895 | * If the threshold scm_mtrigger will be passed by this |
0f2d19dd JB |
1896 | * allocation, or if the first call to malloc fails, |
1897 | * garbage collect -- on the presumption that some objects | |
1898 | * using malloced storage may be collected. | |
1899 | * | |
1900 | * The limit scm_mtrigger may be raised by this allocation. | |
1901 | */ | |
07806695 | 1902 | void * |
1be6b49c | 1903 | scm_must_malloc (size_t size, const char *what) |
0f2d19dd | 1904 | { |
07806695 | 1905 | void *ptr; |
c014a02e | 1906 | unsigned long nm = scm_mallocated + size; |
1be6b49c ML |
1907 | |
1908 | if (nm < size) | |
1909 | /* The byte count of allocated objects has overflowed. This is | |
1910 | probably because you forgot to report the correct size of freed | |
1911 | memory in some of your smob free methods. */ | |
1912 | abort (); | |
e4ef2330 MD |
1913 | |
1914 | if (nm <= scm_mtrigger) | |
0f2d19dd | 1915 | { |
07806695 | 1916 | SCM_SYSCALL (ptr = malloc (size)); |
0f2d19dd JB |
1917 | if (NULL != ptr) |
1918 | { | |
1919 | scm_mallocated = nm; | |
bc9d9bb2 MD |
1920 | #ifdef GUILE_DEBUG_MALLOC |
1921 | scm_malloc_register (ptr, what); | |
1922 | #endif | |
0f2d19dd JB |
1923 | return ptr; |
1924 | } | |
1925 | } | |
6064dcc6 | 1926 | |
0f2d19dd | 1927 | scm_igc (what); |
e4ef2330 | 1928 | |
0f2d19dd | 1929 | nm = scm_mallocated + size; |
1be6b49c ML |
1930 | |
1931 | if (nm < size) | |
1932 | /* The byte count of allocated objects has overflowed. This is | |
1933 | probably because you forgot to report the correct size of freed | |
1934 | memory in some of your smob free methods. */ | |
1935 | abort (); | |
1936 | ||
07806695 | 1937 | SCM_SYSCALL (ptr = malloc (size)); |
0f2d19dd JB |
1938 | if (NULL != ptr) |
1939 | { | |
1940 | scm_mallocated = nm; | |
6064dcc6 MV |
1941 | if (nm > scm_mtrigger - SCM_MTRIGGER_HYSTERESIS) { |
1942 | if (nm > scm_mtrigger) | |
1943 | scm_mtrigger = nm + nm / 2; | |
1944 | else | |
1945 | scm_mtrigger += scm_mtrigger / 2; | |
1946 | } | |
bc9d9bb2 MD |
1947 | #ifdef GUILE_DEBUG_MALLOC |
1948 | scm_malloc_register (ptr, what); | |
1949 | #endif | |
1950 | ||
0f2d19dd JB |
1951 | return ptr; |
1952 | } | |
e4ef2330 | 1953 | |
acf4331f | 1954 | scm_memory_error (what); |
0f2d19dd JB |
1955 | } |
1956 | ||
1957 | ||
1958 | /* scm_must_realloc | |
1959 | * is similar to scm_must_malloc. | |
1960 | */ | |
07806695 JB |
1961 | void * |
1962 | scm_must_realloc (void *where, | |
1be6b49c ML |
1963 | size_t old_size, |
1964 | size_t size, | |
3eeba8d4 | 1965 | const char *what) |
0f2d19dd | 1966 | { |
07806695 | 1967 | void *ptr; |
c014a02e | 1968 | unsigned long nm; |
1be6b49c ML |
1969 | |
1970 | if (size <= old_size) | |
1971 | return where; | |
1972 | ||
1973 | nm = scm_mallocated + size - old_size; | |
1974 | ||
1975 | if (nm < (size - old_size)) | |
1976 | /* The byte count of allocated objects has overflowed. This is | |
1977 | probably because you forgot to report the correct size of freed | |
1978 | memory in some of your smob free methods. */ | |
1979 | abort (); | |
e4ef2330 MD |
1980 | |
1981 | if (nm <= scm_mtrigger) | |
0f2d19dd | 1982 | { |
07806695 | 1983 | SCM_SYSCALL (ptr = realloc (where, size)); |
0f2d19dd JB |
1984 | if (NULL != ptr) |
1985 | { | |
1986 | scm_mallocated = nm; | |
bc9d9bb2 MD |
1987 | #ifdef GUILE_DEBUG_MALLOC |
1988 | scm_malloc_reregister (where, ptr, what); | |
1989 | #endif | |
0f2d19dd JB |
1990 | return ptr; |
1991 | } | |
1992 | } | |
e4ef2330 | 1993 | |
0f2d19dd | 1994 | scm_igc (what); |
e4ef2330 MD |
1995 | |
1996 | nm = scm_mallocated + size - old_size; | |
1be6b49c ML |
1997 | |
1998 | if (nm < (size - old_size)) | |
1999 | /* The byte count of allocated objects has overflowed. This is | |
2000 | probably because you forgot to report the correct size of freed | |
2001 | memory in some of your smob free methods. */ | |
2002 | abort (); | |
2003 | ||
07806695 | 2004 | SCM_SYSCALL (ptr = realloc (where, size)); |
0f2d19dd JB |
2005 | if (NULL != ptr) |
2006 | { | |
2007 | scm_mallocated = nm; | |
6064dcc6 MV |
2008 | if (nm > scm_mtrigger - SCM_MTRIGGER_HYSTERESIS) { |
2009 | if (nm > scm_mtrigger) | |
2010 | scm_mtrigger = nm + nm / 2; | |
2011 | else | |
2012 | scm_mtrigger += scm_mtrigger / 2; | |
2013 | } | |
bc9d9bb2 MD |
2014 | #ifdef GUILE_DEBUG_MALLOC |
2015 | scm_malloc_reregister (where, ptr, what); | |
2016 | #endif | |
0f2d19dd JB |
2017 | return ptr; |
2018 | } | |
e4ef2330 | 2019 | |
acf4331f | 2020 | scm_memory_error (what); |
0f2d19dd JB |
2021 | } |
2022 | ||
e4a7824f | 2023 | char * |
1be6b49c | 2024 | scm_must_strndup (const char *str, size_t length) |
e4a7824f MV |
2025 | { |
2026 | char * dst = scm_must_malloc (length + 1, "scm_must_strndup"); | |
2027 | memcpy (dst, str, length); | |
2028 | dst[length] = 0; | |
2029 | return dst; | |
2030 | } | |
2031 | ||
2032 | char * | |
2033 | scm_must_strdup (const char *str) | |
2034 | { | |
2035 | return scm_must_strndup (str, strlen (str)); | |
2036 | } | |
acf4331f | 2037 | |
a00c95d9 | 2038 | void |
07806695 | 2039 | scm_must_free (void *obj) |
acf4331f | 2040 | #define FUNC_NAME "scm_must_free" |
0f2d19dd | 2041 | { |
bc9d9bb2 MD |
2042 | #ifdef GUILE_DEBUG_MALLOC |
2043 | scm_malloc_unregister (obj); | |
2044 | #endif | |
0f2d19dd JB |
2045 | if (obj) |
2046 | free (obj); | |
2047 | else | |
acf4331f | 2048 | SCM_MISC_ERROR ("freeing NULL pointer", SCM_EOL); |
0f2d19dd | 2049 | } |
acf4331f DH |
2050 | #undef FUNC_NAME |
2051 | ||
0f2d19dd | 2052 | |
c68296f8 MV |
2053 | /* Announce that there has been some malloc done that will be freed |
2054 | * during gc. A typical use is for a smob that uses some malloced | |
2055 | * memory but can not get it from scm_must_malloc (for whatever | |
2056 | * reason). When a new object of this smob is created you call | |
2057 | * scm_done_malloc with the size of the object. When your smob free | |
2058 | * function is called, be sure to include this size in the return | |
9d47a1e6 ML |
2059 | * value. |
2060 | * | |
2061 | * If you can't actually free the memory in the smob free function, | |
2062 | * for whatever reason (like reference counting), you still can (and | |
2063 | * should) report the amount of memory freed when you actually free it. | |
2064 | * Do it by calling scm_done_malloc with the _negated_ size. Clever, | |
2065 | * eh? Or even better, call scm_done_free. */ | |
0f2d19dd | 2066 | |
c68296f8 | 2067 | void |
c014a02e | 2068 | scm_done_malloc (long size) |
c68296f8 | 2069 | { |
1be6b49c ML |
2070 | if (size < 0) { |
2071 | if (scm_mallocated < size) | |
2072 | /* The byte count of allocated objects has underflowed. This is | |
2073 | probably because you forgot to report the sizes of objects you | |
2074 | have allocated, by calling scm_done_malloc or some such. When | |
2075 | the GC freed them, it subtracted their size from | |
2076 | scm_mallocated, which underflowed. */ | |
2077 | abort (); | |
2078 | } else { | |
c014a02e | 2079 | unsigned long nm = scm_mallocated + size; |
1be6b49c ML |
2080 | if (nm < size) |
2081 | /* The byte count of allocated objects has overflowed. This is | |
2082 | probably because you forgot to report the correct size of freed | |
2083 | memory in some of your smob free methods. */ | |
2084 | abort (); | |
2085 | } | |
2086 | ||
c68296f8 MV |
2087 | scm_mallocated += size; |
2088 | ||
2089 | if (scm_mallocated > scm_mtrigger) | |
2090 | { | |
2091 | scm_igc ("foreign mallocs"); | |
2092 | if (scm_mallocated > scm_mtrigger - SCM_MTRIGGER_HYSTERESIS) | |
2093 | { | |
2094 | if (scm_mallocated > scm_mtrigger) | |
2095 | scm_mtrigger = scm_mallocated + scm_mallocated / 2; | |
2096 | else | |
2097 | scm_mtrigger += scm_mtrigger / 2; | |
2098 | } | |
2099 | } | |
2100 | } | |
2101 | ||
9d47a1e6 | 2102 | void |
c014a02e | 2103 | scm_done_free (long size) |
9d47a1e6 | 2104 | { |
1be6b49c ML |
2105 | if (size >= 0) { |
2106 | if (scm_mallocated < size) | |
2107 | /* The byte count of allocated objects has underflowed. This is | |
2108 | probably because you forgot to report the sizes of objects you | |
2109 | have allocated, by calling scm_done_malloc or some such. When | |
2110 | the GC freed them, it subtracted their size from | |
2111 | scm_mallocated, which underflowed. */ | |
2112 | abort (); | |
2113 | } else { | |
c014a02e | 2114 | unsigned long nm = scm_mallocated + size; |
1be6b49c ML |
2115 | if (nm < size) |
2116 | /* The byte count of allocated objects has overflowed. This is | |
2117 | probably because you forgot to report the correct size of freed | |
2118 | memory in some of your smob free methods. */ | |
2119 | abort (); | |
2120 | } | |
2121 | ||
9d47a1e6 ML |
2122 | scm_mallocated -= size; |
2123 | } | |
2124 | ||
c68296f8 MV |
2125 | |
2126 | \f | |
0f2d19dd JB |
2127 | /* {Heap Segments} |
2128 | * | |
2129 | * Each heap segment is an array of objects of a particular size. | |
2130 | * Every segment has an associated (possibly shared) freelist. | |
2131 | * A table of segment records is kept that records the upper and | |
2132 | * lower extents of the segment; this is used during the conservative | |
2133 | * phase of gc to identify probably gc roots (because they point | |
c68296f8 | 2134 | * into valid segments at reasonable offsets). */ |
0f2d19dd JB |
2135 | |
2136 | /* scm_expmem | |
2137 | * is true if the first segment was smaller than INIT_HEAP_SEG. | |
2138 | * If scm_expmem is set to one, subsequent segment allocations will | |
2139 | * allocate segments of size SCM_EXPHEAP(scm_heap_size). | |
2140 | */ | |
2141 | int scm_expmem = 0; | |
2142 | ||
1be6b49c | 2143 | size_t scm_max_segment_size; |
4c48ba06 | 2144 | |
0f2d19dd JB |
2145 | /* scm_heap_org |
2146 | * is the lowest base address of any heap segment. | |
2147 | */ | |
2148 | SCM_CELLPTR scm_heap_org; | |
2149 | ||
a00c95d9 | 2150 | scm_heap_seg_data_t * scm_heap_table = 0; |
1be6b49c ML |
2151 | static size_t heap_segment_table_size = 0; |
2152 | size_t scm_n_heap_segs = 0; | |
0f2d19dd | 2153 | |
0f2d19dd | 2154 | /* init_heap_seg |
d6884e63 | 2155 | * initializes a new heap segment and returns the number of objects it contains. |
0f2d19dd | 2156 | * |
d6884e63 ML |
2157 | * The segment origin and segment size in bytes are input parameters. |
2158 | * The freelist is both input and output. | |
0f2d19dd | 2159 | * |
d6884e63 ML |
2160 | * This function presumes that the scm_heap_table has already been expanded |
2161 | * to accomodate a new segment record and that the markbit space was reserved | |
2162 | * for all the cards in this segment. | |
0f2d19dd JB |
2163 | */ |
2164 | ||
d6884e63 ML |
2165 | #define INIT_CARD(card, span) \ |
2166 | do { \ | |
322ec19d | 2167 | SCM_GC_SET_CARD_BVEC (card, get_bvec ()); \ |
d6884e63 ML |
2168 | if ((span) == 2) \ |
2169 | SCM_GC_SET_CARD_DOUBLECELL (card); \ | |
2170 | } while (0) | |
0f2d19dd | 2171 | |
1be6b49c ML |
2172 | static size_t |
2173 | init_heap_seg (SCM_CELLPTR seg_org, size_t size, scm_freelist_t *freelist) | |
0f2d19dd JB |
2174 | { |
2175 | register SCM_CELLPTR ptr; | |
0f2d19dd | 2176 | SCM_CELLPTR seg_end; |
c014a02e | 2177 | long new_seg_index; |
1be6b49c | 2178 | ptrdiff_t n_new_cells; |
4c48ba06 | 2179 | int span = freelist->span; |
a00c95d9 | 2180 | |
0f2d19dd JB |
2181 | if (seg_org == NULL) |
2182 | return 0; | |
2183 | ||
d6884e63 ML |
2184 | /* Align the begin ptr up. |
2185 | */ | |
2186 | ptr = SCM_GC_CARD_UP (seg_org); | |
acb0a19c | 2187 | |
a00c95d9 | 2188 | /* Compute the ceiling on valid object pointers w/in this segment. |
0f2d19dd | 2189 | */ |
d6884e63 | 2190 | seg_end = SCM_GC_CARD_DOWN ((char *)seg_org + size); |
0f2d19dd | 2191 | |
a00c95d9 | 2192 | /* Find the right place and insert the segment record. |
0f2d19dd JB |
2193 | * |
2194 | */ | |
2195 | for (new_seg_index = 0; | |
2196 | ( (new_seg_index < scm_n_heap_segs) | |
2197 | && SCM_PTR_LE (scm_heap_table[new_seg_index].bounds[0], seg_org)); | |
2198 | new_seg_index++) | |
2199 | ; | |
2200 | ||
2201 | { | |
2202 | int i; | |
2203 | for (i = scm_n_heap_segs; i > new_seg_index; --i) | |
2204 | scm_heap_table[i] = scm_heap_table[i - 1]; | |
2205 | } | |
a00c95d9 | 2206 | |
0f2d19dd JB |
2207 | ++scm_n_heap_segs; |
2208 | ||
945fec60 | 2209 | scm_heap_table[new_seg_index].span = span; |
4c48ba06 | 2210 | scm_heap_table[new_seg_index].freelist = freelist; |
195e6201 DH |
2211 | scm_heap_table[new_seg_index].bounds[0] = ptr; |
2212 | scm_heap_table[new_seg_index].bounds[1] = seg_end; | |
0f2d19dd | 2213 | |
acb0a19c MD |
2214 | /*n_new_cells*/ |
2215 | n_new_cells = seg_end - ptr; | |
0f2d19dd | 2216 | |
4c48ba06 | 2217 | freelist->heap_size += n_new_cells; |
4a4c9785 | 2218 | |
a00c95d9 | 2219 | /* Partition objects in this segment into clusters */ |
4a4c9785 MD |
2220 | { |
2221 | SCM clusters; | |
2222 | SCM *clusterp = &clusters; | |
4a4c9785 | 2223 | |
d6884e63 ML |
2224 | NEXT_DATA_CELL (ptr, span); |
2225 | while (ptr < seg_end) | |
4a4c9785 | 2226 | { |
d6884e63 ML |
2227 | scm_cell *nxt = ptr; |
2228 | scm_cell *prv = NULL; | |
2229 | scm_cell *last_card = NULL; | |
2230 | int n_data_cells = (SCM_GC_CARD_N_DATA_CELLS / span) * SCM_CARDS_PER_CLUSTER - 1; | |
2231 | NEXT_DATA_CELL(nxt, span); | |
4a4c9785 | 2232 | |
4c48ba06 MD |
2233 | /* Allocate cluster spine |
2234 | */ | |
4a4c9785 | 2235 | *clusterp = PTR2SCM (ptr); |
d6884e63 | 2236 | SCM_SETCAR (*clusterp, PTR2SCM (nxt)); |
4a4c9785 | 2237 | clusterp = SCM_CDRLOC (*clusterp); |
d6884e63 | 2238 | ptr = nxt; |
a00c95d9 | 2239 | |
d6884e63 | 2240 | while (n_data_cells--) |
4a4c9785 | 2241 | { |
d6884e63 | 2242 | scm_cell *card = SCM_GC_CELL_CARD (ptr); |
96f6f4ae | 2243 | SCM scmptr = PTR2SCM (ptr); |
d6884e63 ML |
2244 | nxt = ptr; |
2245 | NEXT_DATA_CELL (nxt, span); | |
2246 | prv = ptr; | |
2247 | ||
2248 | if (card != last_card) | |
2249 | { | |
2250 | INIT_CARD (card, span); | |
2251 | last_card = card; | |
2252 | } | |
96f6f4ae | 2253 | |
54778cd3 | 2254 | SCM_SET_CELL_TYPE (scmptr, scm_tc_free_cell); |
22a52da1 | 2255 | SCM_SET_FREE_CELL_CDR (scmptr, PTR2SCM (nxt)); |
d6884e63 ML |
2256 | |
2257 | ptr = nxt; | |
4a4c9785 | 2258 | } |
4c48ba06 | 2259 | |
d6884e63 | 2260 | SCM_SET_FREE_CELL_CDR (PTR2SCM (prv), SCM_EOL); |
4a4c9785 | 2261 | } |
a00c95d9 | 2262 | |
d6884e63 ML |
2263 | /* sanity check */ |
2264 | { | |
2265 | scm_cell *ref = seg_end; | |
2266 | NEXT_DATA_CELL (ref, span); | |
2267 | if (ref != ptr) | |
2268 | /* [cmm] looks like the segment size doesn't divide cleanly by | |
2269 | cluster size. bad cmm! */ | |
2270 | abort(); | |
2271 | } | |
2272 | ||
4a4c9785 MD |
2273 | /* Patch up the last cluster pointer in the segment |
2274 | * to join it to the input freelist. | |
2275 | */ | |
4c48ba06 MD |
2276 | *clusterp = freelist->clusters; |
2277 | freelist->clusters = clusters; | |
4a4c9785 MD |
2278 | } |
2279 | ||
4c48ba06 MD |
2280 | #ifdef DEBUGINFO |
2281 | fprintf (stderr, "H"); | |
2282 | #endif | |
0f2d19dd | 2283 | return size; |
0f2d19dd JB |
2284 | } |
2285 | ||
1be6b49c ML |
2286 | static size_t |
2287 | round_to_cluster_size (scm_freelist_t *freelist, size_t len) | |
a00c95d9 | 2288 | { |
1be6b49c | 2289 | size_t cluster_size_in_bytes = CLUSTER_SIZE_IN_BYTES (freelist); |
a00c95d9 ML |
2290 | |
2291 | return | |
2292 | (len + cluster_size_in_bytes - 1) / cluster_size_in_bytes * cluster_size_in_bytes | |
2293 | + ALIGNMENT_SLACK (freelist); | |
2294 | } | |
2295 | ||
a00c95d9 | 2296 | static void |
b6efc951 | 2297 | alloc_some_heap (scm_freelist_t *freelist, policy_on_error error_policy) |
acf4331f | 2298 | #define FUNC_NAME "alloc_some_heap" |
0f2d19dd | 2299 | { |
0f2d19dd | 2300 | SCM_CELLPTR ptr; |
1be6b49c | 2301 | size_t len; |
a00c95d9 | 2302 | |
9d47a1e6 | 2303 | if (scm_gc_heap_lock) |
b6efc951 DH |
2304 | { |
2305 | /* Critical code sections (such as the garbage collector) aren't | |
2306 | * supposed to add heap segments. | |
2307 | */ | |
2308 | fprintf (stderr, "alloc_some_heap: Can not extend locked heap.\n"); | |
2309 | abort (); | |
2310 | } | |
0f2d19dd | 2311 | |
9d47a1e6 | 2312 | if (scm_n_heap_segs == heap_segment_table_size) |
b6efc951 DH |
2313 | { |
2314 | /* We have to expand the heap segment table to have room for the new | |
2315 | * segment. Do not yet increment scm_n_heap_segs -- that is done by | |
2316 | * init_heap_seg only if the allocation of the segment itself succeeds. | |
2317 | */ | |
1be6b49c | 2318 | size_t new_table_size = scm_n_heap_segs + 1; |
b6efc951 | 2319 | size_t size = new_table_size * sizeof (scm_heap_seg_data_t); |
1be6b49c | 2320 | scm_heap_seg_data_t *new_heap_table; |
b6efc951 DH |
2321 | |
2322 | SCM_SYSCALL (new_heap_table = ((scm_heap_seg_data_t *) | |
2323 | realloc ((char *)scm_heap_table, size))); | |
2324 | if (!new_heap_table) | |
2325 | { | |
2326 | if (error_policy == abort_on_error) | |
2327 | { | |
2328 | fprintf (stderr, "alloc_some_heap: Could not grow heap segment table.\n"); | |
2329 | abort (); | |
2330 | } | |
2331 | else | |
2332 | { | |
2333 | return; | |
2334 | } | |
2335 | } | |
2336 | else | |
2337 | { | |
2338 | scm_heap_table = new_heap_table; | |
2339 | heap_segment_table_size = new_table_size; | |
2340 | } | |
2341 | } | |
0f2d19dd | 2342 | |
0f2d19dd | 2343 | /* Pick a size for the new heap segment. |
a00c95d9 | 2344 | * The rule for picking the size of a segment is explained in |
0f2d19dd JB |
2345 | * gc.h |
2346 | */ | |
4c48ba06 | 2347 | { |
1811ebce MD |
2348 | /* Assure that the new segment is predicted to be large enough. |
2349 | * | |
2350 | * New yield should at least equal GC fraction of new heap size, i.e. | |
2351 | * | |
2352 | * y + dh > f * (h + dh) | |
2353 | * | |
2354 | * y : yield | |
8fef55a8 | 2355 | * f : min yield fraction |
1811ebce MD |
2356 | * h : heap size |
2357 | * dh : size of new heap segment | |
2358 | * | |
2359 | * This gives dh > (f * h - y) / (1 - f) | |
bda1446c | 2360 | */ |
8fef55a8 | 2361 | int f = freelist->min_yield_fraction; |
c014a02e | 2362 | unsigned long h = SCM_HEAP_SIZE; |
1be6b49c | 2363 | size_t min_cells = (f * h - 100 * (long) scm_gc_yield) / (99 - f); |
4c48ba06 MD |
2364 | len = SCM_EXPHEAP (freelist->heap_size); |
2365 | #ifdef DEBUGINFO | |
1be6b49c | 2366 | fprintf (stderr, "(%ld < %ld)", (long) len, (long) min_cells); |
4c48ba06 MD |
2367 | #endif |
2368 | if (len < min_cells) | |
1811ebce | 2369 | len = min_cells + freelist->cluster_size; |
4c48ba06 | 2370 | len *= sizeof (scm_cell); |
1811ebce MD |
2371 | /* force new sampling */ |
2372 | freelist->collected = LONG_MAX; | |
4c48ba06 | 2373 | } |
a00c95d9 | 2374 | |
4c48ba06 MD |
2375 | if (len > scm_max_segment_size) |
2376 | len = scm_max_segment_size; | |
0f2d19dd JB |
2377 | |
2378 | { | |
1be6b49c | 2379 | size_t smallest; |
0f2d19dd | 2380 | |
a00c95d9 | 2381 | smallest = CLUSTER_SIZE_IN_BYTES (freelist); |
a00c95d9 | 2382 | |
0f2d19dd | 2383 | if (len < smallest) |
a00c95d9 | 2384 | len = smallest; |
0f2d19dd JB |
2385 | |
2386 | /* Allocate with decaying ambition. */ | |
2387 | while ((len >= SCM_MIN_HEAP_SEG_SIZE) | |
2388 | && (len >= smallest)) | |
2389 | { | |
1be6b49c | 2390 | size_t rounded_len = round_to_cluster_size (freelist, len); |
a00c95d9 | 2391 | SCM_SYSCALL (ptr = (SCM_CELLPTR) malloc (rounded_len)); |
0f2d19dd JB |
2392 | if (ptr) |
2393 | { | |
a00c95d9 | 2394 | init_heap_seg (ptr, rounded_len, freelist); |
0f2d19dd JB |
2395 | return; |
2396 | } | |
2397 | len /= 2; | |
2398 | } | |
2399 | } | |
2400 | ||
b6efc951 DH |
2401 | if (error_policy == abort_on_error) |
2402 | { | |
2403 | fprintf (stderr, "alloc_some_heap: Could not grow heap.\n"); | |
2404 | abort (); | |
2405 | } | |
0f2d19dd | 2406 | } |
acf4331f | 2407 | #undef FUNC_NAME |
0f2d19dd | 2408 | |
0f2d19dd JB |
2409 | \f |
2410 | /* {GC Protection Helper Functions} | |
2411 | */ | |
2412 | ||
2413 | ||
5d2b97cd DH |
2414 | /* |
2415 | * If within a function you need to protect one or more scheme objects from | |
2416 | * garbage collection, pass them as parameters to one of the | |
2417 | * scm_remember_upto_here* functions below. These functions don't do | |
2418 | * anything, but since the compiler does not know that they are actually | |
2419 | * no-ops, it will generate code that calls these functions with the given | |
2420 | * parameters. Therefore, you can be sure that the compiler will keep those | |
2421 | * scheme values alive (on the stack or in a register) up to the point where | |
2422 | * scm_remember_upto_here* is called. In other words, place the call to | |
2423 | * scm_remember_upt_here* _behind_ the last code in your function, that | |
2424 | * depends on the scheme object to exist. | |
2425 | * | |
2426 | * Example: We want to make sure, that the string object str does not get | |
2427 | * garbage collected during the execution of 'some_function', because | |
2428 | * otherwise the characters belonging to str would be freed and | |
2429 | * 'some_function' might access freed memory. To make sure that the compiler | |
2430 | * keeps str alive on the stack or in a register such that it is visible to | |
2431 | * the conservative gc we add the call to scm_remember_upto_here_1 _after_ the | |
2432 | * call to 'some_function'. Note that this would not be necessary if str was | |
2433 | * used anyway after the call to 'some_function'. | |
2434 | * char *chars = SCM_STRING_CHARS (str); | |
2435 | * some_function (chars); | |
2436 | * scm_remember_upto_here_1 (str); // str will be alive up to this point. | |
2437 | */ | |
2438 | ||
2439 | void | |
2440 | scm_remember_upto_here_1 (SCM obj) | |
2441 | { | |
2442 | /* Empty. Protects a single object from garbage collection. */ | |
2443 | } | |
2444 | ||
2445 | void | |
2446 | scm_remember_upto_here_2 (SCM obj1, SCM obj2) | |
2447 | { | |
2448 | /* Empty. Protects two objects from garbage collection. */ | |
2449 | } | |
2450 | ||
2451 | void | |
2452 | scm_remember_upto_here (SCM obj, ...) | |
2453 | { | |
2454 | /* Empty. Protects any number of objects from garbage collection. */ | |
2455 | } | |
2456 | ||
2457 | ||
2458 | #if (SCM_DEBUG_DEPRECATED == 0) | |
2459 | ||
0f2d19dd | 2460 | void |
6e8d25a6 | 2461 | scm_remember (SCM *ptr) |
b24b5e13 | 2462 | { |
1be6b49c ML |
2463 | scm_c_issue_deprecation_warning ("`scm_remember' is deprecated. " |
2464 | "Use the `scm_remember_upto_here*' family of functions instead."); | |
b24b5e13 | 2465 | } |
0f2d19dd | 2466 | |
5d2b97cd | 2467 | #endif /* SCM_DEBUG_DEPRECATED == 0 */ |
1cc91f1b | 2468 | |
c209c88e | 2469 | /* |
41b0806d GB |
2470 | These crazy functions prevent garbage collection |
2471 | of arguments after the first argument by | |
2472 | ensuring they remain live throughout the | |
2473 | function because they are used in the last | |
2474 | line of the code block. | |
2475 | It'd be better to have a nice compiler hint to | |
2476 | aid the conservative stack-scanning GC. --03/09/00 gjb */ | |
0f2d19dd JB |
2477 | SCM |
2478 | scm_return_first (SCM elt, ...) | |
0f2d19dd JB |
2479 | { |
2480 | return elt; | |
2481 | } | |
2482 | ||
41b0806d GB |
2483 | int |
2484 | scm_return_first_int (int i, ...) | |
2485 | { | |
2486 | return i; | |
2487 | } | |
2488 | ||
0f2d19dd | 2489 | |
0f2d19dd | 2490 | SCM |
6e8d25a6 | 2491 | scm_permanent_object (SCM obj) |
0f2d19dd JB |
2492 | { |
2493 | SCM_REDEFER_INTS; | |
2494 | scm_permobjs = scm_cons (obj, scm_permobjs); | |
2495 | SCM_REALLOW_INTS; | |
2496 | return obj; | |
2497 | } | |
2498 | ||
2499 | ||
7bd4fbe2 MD |
2500 | /* Protect OBJ from the garbage collector. OBJ will not be freed, even if all |
2501 | other references are dropped, until the object is unprotected by calling | |
2502 | scm_unprotect_object (OBJ). Calls to scm_protect/unprotect_object nest, | |
2503 | i. e. it is possible to protect the same object several times, but it is | |
2504 | necessary to unprotect the object the same number of times to actually get | |
2505 | the object unprotected. It is an error to unprotect an object more often | |
2506 | than it has been protected before. The function scm_protect_object returns | |
2507 | OBJ. | |
2508 | */ | |
2509 | ||
2510 | /* Implementation note: For every object X, there is a counter which | |
2511 | scm_protect_object(X) increments and scm_unprotect_object(X) decrements. | |
2512 | */ | |
686765af | 2513 | |
ef290276 | 2514 | SCM |
6e8d25a6 | 2515 | scm_protect_object (SCM obj) |
ef290276 | 2516 | { |
686765af | 2517 | SCM handle; |
9d47a1e6 | 2518 | |
686765af | 2519 | /* This critical section barrier will be replaced by a mutex. */ |
2dd6a83a | 2520 | SCM_REDEFER_INTS; |
9d47a1e6 | 2521 | |
0f0f0899 | 2522 | handle = scm_hashq_create_handle_x (scm_protects, obj, SCM_MAKINUM (0)); |
1be6b49c | 2523 | SCM_SETCDR (handle, scm_sum (SCM_CDR (handle), SCM_MAKINUM (1))); |
9d47a1e6 | 2524 | |
2dd6a83a | 2525 | SCM_REALLOW_INTS; |
9d47a1e6 | 2526 | |
ef290276 JB |
2527 | return obj; |
2528 | } | |
2529 | ||
2530 | ||
2531 | /* Remove any protection for OBJ established by a prior call to | |
dab7f566 | 2532 | scm_protect_object. This function returns OBJ. |
ef290276 | 2533 | |
dab7f566 | 2534 | See scm_protect_object for more information. */ |
ef290276 | 2535 | SCM |
6e8d25a6 | 2536 | scm_unprotect_object (SCM obj) |
ef290276 | 2537 | { |
686765af | 2538 | SCM handle; |
9d47a1e6 | 2539 | |
686765af | 2540 | /* This critical section barrier will be replaced by a mutex. */ |
2dd6a83a | 2541 | SCM_REDEFER_INTS; |
9d47a1e6 | 2542 | |
686765af | 2543 | handle = scm_hashq_get_handle (scm_protects, obj); |
9d47a1e6 | 2544 | |
22a52da1 | 2545 | if (SCM_FALSEP (handle)) |
686765af | 2546 | { |
0f0f0899 MD |
2547 | fprintf (stderr, "scm_unprotect_object called on unprotected object\n"); |
2548 | abort (); | |
686765af | 2549 | } |
6a199940 DH |
2550 | else |
2551 | { | |
1be6b49c ML |
2552 | SCM count = scm_difference (SCM_CDR (handle), SCM_MAKINUM (1)); |
2553 | if (SCM_EQ_P (count, SCM_MAKINUM (0))) | |
6a199940 DH |
2554 | scm_hashq_remove_x (scm_protects, obj); |
2555 | else | |
1be6b49c | 2556 | SCM_SETCDR (handle, count); |
6a199940 | 2557 | } |
686765af | 2558 | |
2dd6a83a | 2559 | SCM_REALLOW_INTS; |
ef290276 JB |
2560 | |
2561 | return obj; | |
2562 | } | |
2563 | ||
c45acc34 JB |
2564 | int terminating; |
2565 | ||
2566 | /* called on process termination. */ | |
e52ceaac MD |
2567 | #ifdef HAVE_ATEXIT |
2568 | static void | |
2569 | cleanup (void) | |
2570 | #else | |
2571 | #ifdef HAVE_ON_EXIT | |
51157deb MD |
2572 | extern int on_exit (void (*procp) (), int arg); |
2573 | ||
e52ceaac MD |
2574 | static void |
2575 | cleanup (int status, void *arg) | |
2576 | #else | |
2577 | #error Dont know how to setup a cleanup handler on your system. | |
2578 | #endif | |
2579 | #endif | |
c45acc34 JB |
2580 | { |
2581 | terminating = 1; | |
2582 | scm_flush_all_ports (); | |
2583 | } | |
ef290276 | 2584 | |
0f2d19dd | 2585 | \f |
acb0a19c | 2586 | static int |
1be6b49c | 2587 | make_initial_segment (size_t init_heap_size, scm_freelist_t *freelist) |
acb0a19c | 2588 | { |
1be6b49c | 2589 | size_t rounded_size = round_to_cluster_size (freelist, init_heap_size); |
d6884e63 | 2590 | |
a00c95d9 ML |
2591 | if (!init_heap_seg ((SCM_CELLPTR) malloc (rounded_size), |
2592 | rounded_size, | |
4c48ba06 | 2593 | freelist)) |
acb0a19c | 2594 | { |
a00c95d9 ML |
2595 | rounded_size = round_to_cluster_size (freelist, SCM_HEAP_SEG_SIZE); |
2596 | if (!init_heap_seg ((SCM_CELLPTR) malloc (rounded_size), | |
2597 | rounded_size, | |
4c48ba06 | 2598 | freelist)) |
acb0a19c MD |
2599 | return 1; |
2600 | } | |
2601 | else | |
2602 | scm_expmem = 1; | |
2603 | ||
8fef55a8 MD |
2604 | if (freelist->min_yield_fraction) |
2605 | freelist->min_yield = (freelist->heap_size * freelist->min_yield_fraction | |
b37fe1c5 | 2606 | / 100); |
8fef55a8 | 2607 | freelist->grow_heap_p = (freelist->heap_size < freelist->min_yield); |
a00c95d9 | 2608 | |
acb0a19c MD |
2609 | return 0; |
2610 | } | |
2611 | ||
2612 | \f | |
4c48ba06 MD |
2613 | static void |
2614 | init_freelist (scm_freelist_t *freelist, | |
2615 | int span, | |
c014a02e | 2616 | long cluster_size, |
8fef55a8 | 2617 | int min_yield) |
4c48ba06 MD |
2618 | { |
2619 | freelist->clusters = SCM_EOL; | |
2620 | freelist->cluster_size = cluster_size + 1; | |
b37fe1c5 MD |
2621 | freelist->left_to_collect = 0; |
2622 | freelist->clusters_allocated = 0; | |
8fef55a8 MD |
2623 | freelist->min_yield = 0; |
2624 | freelist->min_yield_fraction = min_yield; | |
4c48ba06 MD |
2625 | freelist->span = span; |
2626 | freelist->collected = 0; | |
1811ebce | 2627 | freelist->collected_1 = 0; |
4c48ba06 MD |
2628 | freelist->heap_size = 0; |
2629 | } | |
2630 | ||
85db4a2c DH |
2631 | |
2632 | /* Get an integer from an environment variable. */ | |
2633 | static int | |
2634 | scm_i_getenv_int (const char *var, int def) | |
2635 | { | |
2636 | char *end, *val = getenv (var); | |
2637 | long res; | |
2638 | if (!val) | |
2639 | return def; | |
2640 | res = strtol (val, &end, 10); | |
2641 | if (end == val) | |
2642 | return def; | |
2643 | return res; | |
2644 | } | |
2645 | ||
2646 | ||
4a4c9785 | 2647 | int |
85db4a2c | 2648 | scm_init_storage () |
0f2d19dd | 2649 | { |
1be6b49c ML |
2650 | unsigned long gc_trigger_1; |
2651 | unsigned long gc_trigger_2; | |
2652 | size_t init_heap_size_1; | |
2653 | size_t init_heap_size_2; | |
2654 | size_t j; | |
0f2d19dd | 2655 | |
7c33806a DH |
2656 | #if (SCM_DEBUG_CELL_ACCESSES == 1) |
2657 | scm_tc16_allocated = scm_make_smob_type ("allocated cell", 0); | |
2658 | #endif /* SCM_DEBUG_CELL_ACCESSES == 1 */ | |
2659 | ||
0f2d19dd JB |
2660 | j = SCM_NUM_PROTECTS; |
2661 | while (j) | |
2662 | scm_sys_protects[--j] = SCM_BOOL_F; | |
2663 | scm_block_gc = 1; | |
4a4c9785 | 2664 | |
4a4c9785 | 2665 | scm_freelist = SCM_EOL; |
4c48ba06 | 2666 | scm_freelist2 = SCM_EOL; |
85db4a2c DH |
2667 | gc_trigger_1 = scm_i_getenv_int ("GUILE_MIN_YIELD_1", scm_default_min_yield_1); |
2668 | init_freelist (&scm_master_freelist, 1, SCM_CLUSTER_SIZE_1, gc_trigger_1); | |
2669 | gc_trigger_2 = scm_i_getenv_int ("GUILE_MIN_YIELD_2", scm_default_min_yield_2); | |
2670 | init_freelist (&scm_master_freelist2, 2, SCM_CLUSTER_SIZE_2, gc_trigger_2); | |
2671 | scm_max_segment_size = scm_i_getenv_int ("GUILE_MAX_SEGMENT_SIZE", scm_default_max_segment_size); | |
4a4c9785 | 2672 | |
0f2d19dd JB |
2673 | scm_expmem = 0; |
2674 | ||
2675 | j = SCM_HEAP_SEG_SIZE; | |
2676 | scm_mtrigger = SCM_INIT_MALLOC_LIMIT; | |
a00c95d9 ML |
2677 | scm_heap_table = ((scm_heap_seg_data_t *) |
2678 | scm_must_malloc (sizeof (scm_heap_seg_data_t) * 2, "hplims")); | |
b6efc951 | 2679 | heap_segment_table_size = 2; |
acb0a19c | 2680 | |
d6884e63 ML |
2681 | mark_space_ptr = &mark_space_head; |
2682 | ||
85db4a2c DH |
2683 | init_heap_size_1 = scm_i_getenv_int ("GUILE_INIT_SEGMENT_SIZE_1", scm_default_init_heap_size_1); |
2684 | init_heap_size_2 = scm_i_getenv_int ("GUILE_INIT_SEGMENT_SIZE_2", scm_default_init_heap_size_2); | |
4c48ba06 MD |
2685 | if (make_initial_segment (init_heap_size_1, &scm_master_freelist) || |
2686 | make_initial_segment (init_heap_size_2, &scm_master_freelist2)) | |
4a4c9785 | 2687 | return 1; |
acb0a19c | 2688 | |
801cb5e7 | 2689 | /* scm_hplims[0] can change. do not remove scm_heap_org */ |
a00c95d9 | 2690 | scm_heap_org = CELL_UP (scm_heap_table[0].bounds[0], 1); |
acb0a19c | 2691 | |
801cb5e7 MD |
2692 | scm_c_hook_init (&scm_before_gc_c_hook, 0, SCM_C_HOOK_NORMAL); |
2693 | scm_c_hook_init (&scm_before_mark_c_hook, 0, SCM_C_HOOK_NORMAL); | |
2694 | scm_c_hook_init (&scm_before_sweep_c_hook, 0, SCM_C_HOOK_NORMAL); | |
2695 | scm_c_hook_init (&scm_after_sweep_c_hook, 0, SCM_C_HOOK_NORMAL); | |
2696 | scm_c_hook_init (&scm_after_gc_c_hook, 0, SCM_C_HOOK_NORMAL); | |
0f2d19dd JB |
2697 | |
2698 | /* Initialise the list of ports. */ | |
1be6b49c ML |
2699 | scm_port_table = (scm_port_t **) |
2700 | malloc (sizeof (scm_port_t *) * scm_port_table_room); | |
0f2d19dd JB |
2701 | if (!scm_port_table) |
2702 | return 1; | |
2703 | ||
a18bcd0e | 2704 | #ifdef HAVE_ATEXIT |
c45acc34 | 2705 | atexit (cleanup); |
e52ceaac MD |
2706 | #else |
2707 | #ifdef HAVE_ON_EXIT | |
2708 | on_exit (cleanup, 0); | |
2709 | #endif | |
a18bcd0e | 2710 | #endif |
0f2d19dd | 2711 | |
8960e0a0 | 2712 | scm_stand_in_procs = SCM_EOL; |
0f2d19dd | 2713 | scm_permobjs = SCM_EOL; |
00ffa0e7 | 2714 | scm_protects = scm_c_make_hash_table (31); |
d6884e63 | 2715 | |
0f2d19dd JB |
2716 | return 0; |
2717 | } | |
939794ce | 2718 | |
0f2d19dd JB |
2719 | \f |
2720 | ||
939794ce DH |
2721 | SCM scm_after_gc_hook; |
2722 | ||
939794ce DH |
2723 | static SCM gc_async; |
2724 | ||
939794ce DH |
2725 | /* The function gc_async_thunk causes the execution of the after-gc-hook. It |
2726 | * is run after the gc, as soon as the asynchronous events are handled by the | |
2727 | * evaluator. | |
2728 | */ | |
2729 | static SCM | |
2730 | gc_async_thunk (void) | |
2731 | { | |
2732 | scm_c_run_hook (scm_after_gc_hook, SCM_EOL); | |
939794ce DH |
2733 | return SCM_UNSPECIFIED; |
2734 | } | |
2735 | ||
2736 | ||
2737 | /* The function mark_gc_async is run by the scm_after_gc_c_hook at the end of | |
2738 | * the garbage collection. The only purpose of this function is to mark the | |
2739 | * gc_async (which will eventually lead to the execution of the | |
2740 | * gc_async_thunk). | |
2741 | */ | |
2742 | static void * | |
2743 | mark_gc_async (void * hook_data, void *func_data, void *data) | |
2744 | { | |
2745 | scm_system_async_mark (gc_async); | |
2746 | return NULL; | |
2747 | } | |
2748 | ||
2749 | ||
0f2d19dd JB |
2750 | void |
2751 | scm_init_gc () | |
0f2d19dd | 2752 | { |
939794ce DH |
2753 | SCM after_gc_thunk; |
2754 | ||
56e55ac7 | 2755 | /* Dirk:FIXME:: scm_create_hook is strange. */ |
801cb5e7 | 2756 | scm_after_gc_hook = scm_create_hook ("after-gc-hook", 0); |
939794ce | 2757 | |
9a441ddb MV |
2758 | after_gc_thunk = scm_c_make_subr ("%gc-thunk", scm_tc7_subr_0, |
2759 | gc_async_thunk); | |
23670993 | 2760 | gc_async = scm_system_async (after_gc_thunk); /* protected via scm_asyncs */ |
939794ce DH |
2761 | |
2762 | scm_c_hook_add (&scm_after_gc_c_hook, mark_gc_async, NULL, 0); | |
2763 | ||
8dc9439f | 2764 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 2765 | #include "libguile/gc.x" |
8dc9439f | 2766 | #endif |
0f2d19dd | 2767 | } |
89e00824 | 2768 | |
56495472 ML |
2769 | #endif /*MARK_DEPENDENCIES*/ |
2770 | ||
89e00824 ML |
2771 | /* |
2772 | Local Variables: | |
2773 | c-file-style: "gnu" | |
2774 | End: | |
2775 | */ |