1 /* Copyright (C) 1995, 96, 97, 98, 99, 2000 Free Software Foundation, Inc.
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)
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.
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
15 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
16 * Boston, MA 02111-1307 USA
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
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.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
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.
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.
40 * If you do not wish that, delete this exception notice. */
42 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
43 gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
45 /* #define DEBUGINFO */
49 #include "libguile/_scm.h"
50 #include "libguile/eval.h"
51 #include "libguile/stime.h"
52 #include "libguile/stackchk.h"
53 #include "libguile/struct.h"
54 #include "libguile/smob.h"
55 #include "libguile/unif.h"
56 #include "libguile/async.h"
57 #include "libguile/ports.h"
58 #include "libguile/root.h"
59 #include "libguile/strings.h"
60 #include "libguile/vectors.h"
61 #include "libguile/weaks.h"
62 #include "libguile/hashtab.h"
64 #include "libguile/validate.h"
65 #include "libguile/gc.h"
67 #ifdef GUILE_DEBUG_MALLOC
68 #include "libguile/debug-malloc.h"
81 #define var_start(x, y) va_start(x, y)
84 #define var_start(x, y) va_start(x)
89 unsigned int scm_gc_running_p
= 0;
93 #if (SCM_DEBUG_CELL_ACCESSES == 1)
95 unsigned int scm_debug_cell_accesses_p
= 0;
98 /* Assert that the given object is a valid reference to a valid cell. This
99 * test involves to determine whether the object is a cell pointer, whether
100 * this pointer actually points into a heap segment and whether the cell
101 * pointed to is not a free cell.
104 scm_assert_cell_valid (SCM cell
)
106 if (scm_debug_cell_accesses_p
)
108 scm_debug_cell_accesses_p
= 0; /* disable to avoid recursion */
110 if (!scm_cellp (cell
))
112 fprintf (stderr
, "scm_assert_cell_valid: Not a cell object: %lx\n", SCM_UNPACK (cell
));
115 else if (!scm_gc_running_p
)
117 /* Dirk::FIXME:: During garbage collection there occur references to
118 free cells. This is allright during conservative marking, but
119 should not happen otherwise (I think). The case of free cells
120 accessed during conservative marking is handled in function
121 scm_mark_locations. However, there still occur accesses to free
122 cells during gc. I don't understand why this happens. If it is
123 a bug and gets fixed, the following test should also work while
126 if (SCM_FREE_CELL_P (cell
))
128 fprintf (stderr
, "scm_assert_cell_valid: Accessing free cell: %lx\n", SCM_UNPACK (cell
));
132 scm_debug_cell_accesses_p
= 1; /* re-enable */
137 SCM_DEFINE (scm_set_debug_cell_accesses_x
, "set-debug-cell-accesses!", 1, 0, 0,
139 "If FLAG is #f, cell access checking is disabled.\n"
140 "If FLAG is #t, cell access checking is enabled.\n"
141 "This procedure only exists because the compile-time flag\n"
142 "SCM_DEBUG_CELL_ACCESSES was set to 1.\n")
143 #define FUNC_NAME s_scm_set_debug_cell_accesses_x
145 if (SCM_FALSEP (flag
)) {
146 scm_debug_cell_accesses_p
= 0;
147 } else if (SCM_EQ_P (flag
, SCM_BOOL_T
)) {
148 scm_debug_cell_accesses_p
= 1;
150 SCM_WRONG_TYPE_ARG (1, flag
);
152 return SCM_UNSPECIFIED
;
156 #endif /* SCM_DEBUG_CELL_ACCESSES == 1 */
160 /* {heap tuning parameters}
162 * These are parameters for controlling memory allocation. The heap
163 * is the area out of which scm_cons, and object headers are allocated.
165 * Each heap cell is 8 bytes on a 32 bit machine and 16 bytes on a
166 * 64 bit machine. The units of the _SIZE parameters are bytes.
167 * Cons pairs and object headers occupy one heap cell.
169 * SCM_INIT_HEAP_SIZE is the initial size of heap. If this much heap is
170 * allocated initially the heap will grow by half its current size
171 * each subsequent time more heap is needed.
173 * If SCM_INIT_HEAP_SIZE heap cannot be allocated initially, SCM_HEAP_SEG_SIZE
174 * will be used, and the heap will grow by SCM_HEAP_SEG_SIZE when more
175 * heap is needed. SCM_HEAP_SEG_SIZE must fit into type scm_sizet. This code
176 * is in scm_init_storage() and alloc_some_heap() in sys.c
178 * If SCM_INIT_HEAP_SIZE can be allocated initially, the heap will grow by
179 * SCM_EXPHEAP(scm_heap_size) when more heap is needed.
181 * SCM_MIN_HEAP_SEG_SIZE is minimum size of heap to accept when more heap
184 * INIT_MALLOC_LIMIT is the initial amount of malloc usage which will
187 * SCM_MTRIGGER_HYSTERESIS is the amount of malloc storage that must be
188 * reclaimed by a GC triggered by must_malloc. If less than this is
189 * reclaimed, the trigger threshold is raised. [I don't know what a
190 * good value is. I arbitrarily chose 1/10 of the INIT_MALLOC_LIMIT to
191 * work around a oscillation that caused almost constant GC.]
195 * Heap size 45000 and 40% min yield gives quick startup and no extra
196 * heap allocation. Having higher values on min yield may lead to
197 * large heaps, especially if code behaviour is varying its
198 * maximum consumption between different freelists.
201 #define SCM_DATA_CELLS2CARDS(n) (((n) + SCM_GC_CARD_N_DATA_CELLS - 1) / SCM_GC_CARD_N_DATA_CELLS)
202 #define SCM_CARDS_PER_CLUSTER SCM_DATA_CELLS2CARDS (2000L)
203 #define SCM_CLUSTER_SIZE_1 (SCM_CARDS_PER_CLUSTER * SCM_GC_CARD_N_DATA_CELLS)
204 int scm_default_init_heap_size_1
= (((SCM_DATA_CELLS2CARDS (45000L) + SCM_CARDS_PER_CLUSTER
- 1)
205 / SCM_CARDS_PER_CLUSTER
) * SCM_GC_CARD_SIZE
);
206 int scm_default_min_yield_1
= 40;
208 #define SCM_CLUSTER_SIZE_2 (SCM_CARDS_PER_CLUSTER * (SCM_GC_CARD_N_DATA_CELLS / 2))
209 int scm_default_init_heap_size_2
= (((SCM_DATA_CELLS2CARDS (2500L * 2) + SCM_CARDS_PER_CLUSTER
- 1)
210 / SCM_CARDS_PER_CLUSTER
) * SCM_GC_CARD_SIZE
);
211 /* The following value may seem large, but note that if we get to GC at
212 * all, this means that we have a numerically intensive application
214 int scm_default_min_yield_2
= 40;
216 int scm_default_max_segment_size
= 2097000L;/* a little less (adm) than 2 Mb */
218 #define SCM_MIN_HEAP_SEG_SIZE (8 * SCM_GC_CARD_SIZE)
220 # define SCM_HEAP_SEG_SIZE 32768L
223 # define SCM_HEAP_SEG_SIZE (7000L * sizeof (scm_cell))
225 # define SCM_HEAP_SEG_SIZE (16384L * sizeof (scm_cell))
228 /* Make heap grow with factor 1.5 */
229 #define SCM_EXPHEAP(scm_heap_size) (scm_heap_size / 2)
230 #define SCM_INIT_MALLOC_LIMIT 100000
231 #define SCM_MTRIGGER_HYSTERESIS (SCM_INIT_MALLOC_LIMIT/10)
233 /* CELL_UP and CELL_DN are used by scm_init_heap_seg to find (scm_cell * span)
234 aligned inner bounds for allocated storage */
237 /*in 386 protected mode we must only adjust the offset */
238 # define CELL_UP(p, span) MK_FP(FP_SEG(p), ~(8*(span)-1)&(FP_OFF(p)+8*(span)-1))
239 # define CELL_DN(p, span) MK_FP(FP_SEG(p), ~(8*(span)-1)&FP_OFF(p))
242 # define CELL_UP(p, span) (SCM_CELLPTR)(~(span) & ((long)(p)+(span)))
243 # define CELL_DN(p, span) (SCM_CELLPTR)(~(span) & (long)(p))
245 # define CELL_UP(p, span) (SCM_CELLPTR)(~(sizeof(scm_cell)*(span)-1L) & ((long)(p)+sizeof(scm_cell)*(span)-1L))
246 # define CELL_DN(p, span) (SCM_CELLPTR)(~(sizeof(scm_cell)*(span)-1L) & (long)(p))
250 #define ALIGNMENT_SLACK(freelist) (SCM_GC_CARD_SIZE - 1)
251 #define CLUSTER_SIZE_IN_BYTES(freelist) \
252 (((freelist)->cluster_size / (SCM_GC_CARD_N_DATA_CELLS / (freelist)->span)) * SCM_GC_CARD_SIZE)
258 typedef struct scm_freelist_t
{
259 /* collected cells */
261 /* number of cells left to collect before cluster is full */
262 unsigned int left_to_collect
;
263 /* number of clusters which have been allocated */
264 unsigned int clusters_allocated
;
265 /* a list of freelists, each of size cluster_size,
266 * except the last one which may be shorter
270 /* this is the number of objects in each cluster, including the spine cell */
272 /* indicates that we should grow heap instead of GC:ing
275 /* minimum yield on this list in order not to grow the heap
278 /* defines min_yield as percent of total heap size
280 int min_yield_fraction
;
281 /* number of cells per object on this list */
283 /* number of collected cells during last GC */
285 /* number of collected cells during penultimate GC */
287 /* total number of cells in heap segments
288 * belonging to this list.
293 SCM scm_freelist
= SCM_EOL
;
294 scm_freelist_t scm_master_freelist
= {
295 SCM_EOL
, 0, 0, SCM_EOL
, 0, SCM_CLUSTER_SIZE_1
, 0, 0, 0, 1, 0, 0
297 SCM scm_freelist2
= SCM_EOL
;
298 scm_freelist_t scm_master_freelist2
= {
299 SCM_EOL
, 0, 0, SCM_EOL
, 0, SCM_CLUSTER_SIZE_2
, 0, 0, 0, 2, 0, 0
303 * is the number of bytes of must_malloc allocation needed to trigger gc.
305 unsigned long scm_mtrigger
;
308 * If set, don't expand the heap. Set only during gc, during which no allocation
309 * is supposed to take place anyway.
311 int scm_gc_heap_lock
= 0;
314 * Don't pause for collection if this is set -- just
317 int scm_block_gc
= 1;
319 /* During collection, this accumulates objects holding
322 SCM scm_weak_vectors
;
324 /* During collection, this accumulates structures which are to be freed.
326 SCM scm_structs_to_free
;
328 /* GC Statistics Keeping
330 unsigned long scm_cells_allocated
= 0;
331 long scm_mallocated
= 0;
332 unsigned long scm_gc_cells_collected
;
333 unsigned long scm_gc_yield
;
334 static unsigned long scm_gc_yield_1
= 0; /* previous GC yield */
335 unsigned long scm_gc_malloc_collected
;
336 unsigned long scm_gc_ports_collected
;
337 unsigned long scm_gc_time_taken
= 0;
338 static unsigned long t_before_gc
;
339 static unsigned long t_before_sweep
;
340 unsigned long scm_gc_mark_time_taken
= 0;
341 unsigned long scm_gc_sweep_time_taken
= 0;
342 unsigned long scm_gc_times
= 0;
343 unsigned long scm_gc_cells_swept
= 0;
344 double scm_gc_cells_marked_acc
= 0.;
345 double scm_gc_cells_swept_acc
= 0.;
347 SCM_SYMBOL (sym_cells_allocated
, "cells-allocated");
348 SCM_SYMBOL (sym_heap_size
, "cell-heap-size");
349 SCM_SYMBOL (sym_mallocated
, "bytes-malloced");
350 SCM_SYMBOL (sym_mtrigger
, "gc-malloc-threshold");
351 SCM_SYMBOL (sym_heap_segments
, "cell-heap-segments");
352 SCM_SYMBOL (sym_gc_time_taken
, "gc-time-taken");
353 SCM_SYMBOL (sym_gc_mark_time_taken
, "gc-mark-time-taken");
354 SCM_SYMBOL (sym_gc_sweep_time_taken
, "gc-sweep-time-taken");
355 SCM_SYMBOL (sym_times
, "gc-times");
356 SCM_SYMBOL (sym_cells_marked
, "cells-marked");
357 SCM_SYMBOL (sym_cells_swept
, "cells-swept");
359 typedef struct scm_heap_seg_data_t
361 /* lower and upper bounds of the segment */
362 SCM_CELLPTR bounds
[2];
364 /* address of the head-of-freelist pointer for this segment's cells.
365 All segments usually point to the same one, scm_freelist. */
366 scm_freelist_t
*freelist
;
368 /* number of cells per object in this segment */
370 } scm_heap_seg_data_t
;
374 static scm_sizet
init_heap_seg (SCM_CELLPTR
, scm_sizet
, scm_freelist_t
*);
376 typedef enum { return_on_error
, abort_on_error
} policy_on_error
;
377 static void alloc_some_heap (scm_freelist_t
*, policy_on_error
);
380 #define SCM_HEAP_SIZE \
381 (scm_master_freelist.heap_size + scm_master_freelist2.heap_size)
382 #define SCM_MAX(A, B) ((A) > (B) ? (A) : (B))
384 #define BVEC_GROW_SIZE 256
385 #define BVEC_GROW_SIZE_IN_LIMBS (SCM_GC_CARD_BVEC_SIZE_IN_LIMBS * BVEC_GROW_SIZE)
386 #define BVEC_GROW_SIZE_IN_BYTES (BVEC_GROW_SIZE_IN_LIMBS * sizeof (scm_c_bvec_limb_t))
388 /* mark space allocation */
390 typedef struct scm_mark_space_t
392 scm_c_bvec_limb_t
*bvec_space
;
393 struct scm_mark_space_t
*next
;
396 static scm_mark_space_t
*current_mark_space
;
397 static scm_mark_space_t
**mark_space_ptr
;
398 static int current_mark_space_offset
;
399 static scm_mark_space_t
*mark_space_head
;
401 static scm_c_bvec_limb_t
*
404 scm_c_bvec_limb_t
*res
;
406 if (!current_mark_space
)
408 SCM_SYSCALL (current_mark_space
= (scm_mark_space_t
*) malloc (sizeof (scm_mark_space_t
)));
409 if (!current_mark_space
)
410 scm_wta (SCM_UNDEFINED
, "could not grow", "heap");
412 current_mark_space
->bvec_space
= NULL
;
413 current_mark_space
->next
= NULL
;
415 *mark_space_ptr
= current_mark_space
;
416 mark_space_ptr
= &(current_mark_space
->next
);
421 if (!(current_mark_space
->bvec_space
))
423 SCM_SYSCALL (current_mark_space
->bvec_space
=
424 (scm_c_bvec_limb_t
*) calloc (BVEC_GROW_SIZE_IN_BYTES
, 1));
425 if (!(current_mark_space
->bvec_space
))
426 scm_wta (SCM_UNDEFINED
, "could not grow", "heap");
428 current_mark_space_offset
= 0;
433 if (current_mark_space_offset
== BVEC_GROW_SIZE_IN_LIMBS
)
435 current_mark_space
= NULL
;
440 res
= current_mark_space
->bvec_space
+ current_mark_space_offset
;
441 current_mark_space_offset
+= SCM_GC_CARD_BVEC_SIZE_IN_LIMBS
;
449 scm_mark_space_t
*ms
;
451 for (ms
= mark_space_head
; ms
; ms
= ms
->next
)
452 memset (ms
->bvec_space
, 0, BVEC_GROW_SIZE_IN_BYTES
);
457 /* Debugging functions. */
459 #if defined (GUILE_DEBUG) || defined (GUILE_DEBUG_FREELIST)
461 /* Return the number of the heap segment containing CELL. */
467 for (i
= 0; i
< scm_n_heap_segs
; i
++)
468 if (SCM_PTR_LE (scm_heap_table
[i
].bounds
[0], SCM2PTR (cell
))
469 && SCM_PTR_GT (scm_heap_table
[i
].bounds
[1], SCM2PTR (cell
)))
471 fprintf (stderr
, "which_seg: can't find segment containing cell %lx\n",
478 map_free_list (scm_freelist_t
*master
, SCM freelist
)
480 int last_seg
= -1, count
= 0;
483 for (f
= freelist
; !SCM_NULLP (f
); f
= SCM_FREE_CELL_CDR (f
))
485 int this_seg
= which_seg (f
);
487 if (this_seg
!= last_seg
)
490 fprintf (stderr
, " %5d %d-cells in segment %d\n",
491 count
, master
->span
, last_seg
);
498 fprintf (stderr
, " %5d %d-cells in segment %d\n",
499 count
, master
->span
, last_seg
);
502 SCM_DEFINE (scm_map_free_list
, "map-free-list", 0, 0, 0,
504 "Print debugging information about the free-list.\n"
505 "`map-free-list' is only included in --enable-guile-debug builds of Guile.")
506 #define FUNC_NAME s_scm_map_free_list
509 fprintf (stderr
, "%d segments total (%d:%d",
511 scm_heap_table
[0].span
,
512 scm_heap_table
[0].bounds
[1] - scm_heap_table
[0].bounds
[0]);
513 for (i
= 1; i
< scm_n_heap_segs
; i
++)
514 fprintf (stderr
, ", %d:%d",
515 scm_heap_table
[i
].span
,
516 scm_heap_table
[i
].bounds
[1] - scm_heap_table
[i
].bounds
[0]);
517 fprintf (stderr
, ")\n");
518 map_free_list (&scm_master_freelist
, scm_freelist
);
519 map_free_list (&scm_master_freelist2
, scm_freelist2
);
522 return SCM_UNSPECIFIED
;
526 static int last_cluster
;
527 static int last_size
;
530 free_list_length (char *title
, int i
, SCM freelist
)
534 for (ls
= freelist
; !SCM_NULLP (ls
); ls
= SCM_FREE_CELL_CDR (ls
))
535 if (SCM_FREE_CELL_P (ls
))
539 fprintf (stderr
, "bad cell in %s at position %d\n", title
, n
);
546 if (last_cluster
== i
- 1)
547 fprintf (stderr
, "\t%d\n", last_size
);
549 fprintf (stderr
, "-%d\t%d\n", i
- 1, last_size
);
552 fprintf (stderr
, "%s %d", title
, i
);
554 fprintf (stderr
, "%s\t%d\n", title
, n
);
562 free_list_lengths (char *title
, scm_freelist_t
*master
, SCM freelist
)
565 int i
= 0, len
, n
= 0;
566 fprintf (stderr
, "%s\n\n", title
);
567 n
+= free_list_length ("free list", -1, freelist
);
568 for (clusters
= master
->clusters
;
569 SCM_NNULLP (clusters
);
570 clusters
= SCM_CDR (clusters
))
572 len
= free_list_length ("cluster", i
++, SCM_CAR (clusters
));
575 if (last_cluster
== i
- 1)
576 fprintf (stderr
, "\t%d\n", last_size
);
578 fprintf (stderr
, "-%d\t%d\n", i
- 1, last_size
);
579 fprintf (stderr
, "\ntotal %d objects\n\n", n
);
582 SCM_DEFINE (scm_free_list_length
, "free-list-length", 0, 0, 0,
584 "Print debugging information about the free-list.\n"
585 "`free-list-length' is only included in --enable-guile-debug builds of Guile.")
586 #define FUNC_NAME s_scm_free_list_length
588 free_list_lengths ("1-cells", &scm_master_freelist
, scm_freelist
);
589 free_list_lengths ("2-cells", &scm_master_freelist2
, scm_freelist2
);
590 return SCM_UNSPECIFIED
;
596 #ifdef GUILE_DEBUG_FREELIST
598 /* Number of calls to SCM_NEWCELL since startup. */
599 static unsigned long scm_newcell_count
;
600 static unsigned long scm_newcell2_count
;
602 /* Search freelist for anything that isn't marked as a free cell.
603 Abort if we find something. */
605 scm_check_freelist (SCM freelist
)
610 for (f
= freelist
; !SCM_NULLP (f
); f
= SCM_FREE_CELL_CDR (f
), i
++)
611 if (!SCM_FREE_CELL_P (f
))
613 fprintf (stderr
, "Bad cell in freelist on newcell %lu: %d'th elt\n",
614 scm_newcell_count
, i
);
619 SCM_DEFINE (scm_gc_set_debug_check_freelist_x
, "gc-set-debug-check-freelist!", 1, 0, 0,
621 "If FLAG is #t, check the freelist for consistency on each cell allocation.\n"
622 "This procedure only exists because the GUILE_DEBUG_FREELIST \n"
623 "compile-time flag was selected.\n")
624 #define FUNC_NAME s_scm_gc_set_debug_check_freelist_x
626 /* [cmm] I did a double-take when I read this code the first time.
628 SCM_VALIDATE_BOOL_COPY (1, flag
, scm_debug_check_freelist
);
629 return SCM_UNSPECIFIED
;
635 scm_debug_newcell (void)
640 if (scm_debug_check_freelist
)
642 scm_check_freelist (scm_freelist
);
646 /* The rest of this is supposed to be identical to the SCM_NEWCELL
648 if (SCM_NULLP (scm_freelist
))
649 new = scm_gc_for_newcell (&scm_master_freelist
, &scm_freelist
);
653 scm_freelist
= SCM_FREE_CELL_CDR (scm_freelist
);
660 scm_debug_newcell2 (void)
664 scm_newcell2_count
++;
665 if (scm_debug_check_freelist
)
667 scm_check_freelist (scm_freelist2
);
671 /* The rest of this is supposed to be identical to the SCM_NEWCELL
673 if (SCM_NULLP (scm_freelist2
))
674 new = scm_gc_for_newcell (&scm_master_freelist2
, &scm_freelist2
);
678 scm_freelist2
= SCM_FREE_CELL_CDR (scm_freelist2
);
684 #endif /* GUILE_DEBUG_FREELIST */
689 master_cells_allocated (scm_freelist_t
*master
)
691 /* the '- 1' below is to ignore the cluster spine cells. */
692 int objects
= master
->clusters_allocated
* (master
->cluster_size
- 1);
693 if (SCM_NULLP (master
->clusters
))
694 objects
-= master
->left_to_collect
;
695 return master
->span
* objects
;
699 freelist_length (SCM freelist
)
702 for (n
= 0; !SCM_NULLP (freelist
); freelist
= SCM_FREE_CELL_CDR (freelist
))
708 compute_cells_allocated ()
710 return (scm_cells_allocated
711 + master_cells_allocated (&scm_master_freelist
)
712 + master_cells_allocated (&scm_master_freelist2
)
713 - scm_master_freelist
.span
* freelist_length (scm_freelist
)
714 - scm_master_freelist2
.span
* freelist_length (scm_freelist2
));
717 /* {Scheme Interface to GC}
720 SCM_DEFINE (scm_gc_stats
, "gc-stats", 0, 0, 0,
722 "Returns an association list of statistics about Guile's current use of storage. ")
723 #define FUNC_NAME s_scm_gc_stats
728 long int local_scm_mtrigger
;
729 long int local_scm_mallocated
;
730 long int local_scm_heap_size
;
731 long int local_scm_cells_allocated
;
732 long int local_scm_gc_time_taken
;
733 long int local_scm_gc_times
;
734 long int local_scm_gc_mark_time_taken
;
735 long int local_scm_gc_sweep_time_taken
;
736 double local_scm_gc_cells_swept
;
737 double local_scm_gc_cells_marked
;
747 for (i
= scm_n_heap_segs
; i
--; )
748 heap_segs
= scm_cons (scm_cons (scm_ulong2num ((unsigned long)scm_heap_table
[i
].bounds
[1]),
749 scm_ulong2num ((unsigned long)scm_heap_table
[i
].bounds
[0])),
751 if (scm_n_heap_segs
!= n
)
756 /* Below, we cons to produce the resulting list. We want a snapshot of
757 * the heap situation before consing.
759 local_scm_mtrigger
= scm_mtrigger
;
760 local_scm_mallocated
= scm_mallocated
;
761 local_scm_heap_size
= SCM_HEAP_SIZE
;
762 local_scm_cells_allocated
= compute_cells_allocated ();
763 local_scm_gc_time_taken
= scm_gc_time_taken
;
764 local_scm_gc_mark_time_taken
= scm_gc_mark_time_taken
;
765 local_scm_gc_sweep_time_taken
= scm_gc_sweep_time_taken
;
766 local_scm_gc_times
= scm_gc_times
;
767 local_scm_gc_cells_swept
= scm_gc_cells_swept_acc
;
768 local_scm_gc_cells_marked
= scm_gc_cells_marked_acc
;
770 answer
= scm_listify (scm_cons (sym_gc_time_taken
, scm_ulong2num (local_scm_gc_time_taken
)),
771 scm_cons (sym_cells_allocated
, scm_ulong2num (local_scm_cells_allocated
)),
772 scm_cons (sym_heap_size
, scm_ulong2num (local_scm_heap_size
)),
773 scm_cons (sym_mallocated
, scm_ulong2num (local_scm_mallocated
)),
774 scm_cons (sym_mtrigger
, scm_ulong2num (local_scm_mtrigger
)),
775 scm_cons (sym_times
, scm_ulong2num (local_scm_gc_times
)),
776 scm_cons (sym_gc_mark_time_taken
, scm_ulong2num (local_scm_gc_mark_time_taken
)),
777 scm_cons (sym_gc_sweep_time_taken
, scm_ulong2num (local_scm_gc_sweep_time_taken
)),
778 scm_cons (sym_cells_marked
, scm_dbl2big (local_scm_gc_cells_marked
)),
779 scm_cons (sym_cells_swept
, scm_dbl2big (local_scm_gc_cells_swept
)),
780 scm_cons (sym_heap_segments
, heap_segs
),
789 gc_start_stats (const char *what
)
791 t_before_gc
= scm_c_get_internal_run_time ();
792 scm_gc_cells_swept
= 0;
793 scm_gc_cells_collected
= 0;
794 scm_gc_yield_1
= scm_gc_yield
;
795 scm_gc_yield
= (scm_cells_allocated
796 + master_cells_allocated (&scm_master_freelist
)
797 + master_cells_allocated (&scm_master_freelist2
));
798 scm_gc_malloc_collected
= 0;
799 scm_gc_ports_collected
= 0;
806 unsigned long t
= scm_c_get_internal_run_time ();
807 scm_gc_time_taken
+= (t
- t_before_gc
);
808 scm_gc_sweep_time_taken
+= (t
- t_before_sweep
);
811 scm_gc_cells_marked_acc
+= scm_gc_cells_swept
- scm_gc_cells_collected
;
812 scm_gc_cells_swept_acc
+= scm_gc_cells_swept
;
816 SCM_DEFINE (scm_object_address
, "object-address", 1, 0, 0,
818 "Return an integer that for the lifetime of @var{obj} is uniquely\n"
819 "returned by this function for @var{obj}")
820 #define FUNC_NAME s_scm_object_address
822 return scm_ulong2num ((unsigned long) SCM_UNPACK (obj
));
827 SCM_DEFINE (scm_gc
, "gc", 0, 0, 0,
829 "Scans all of SCM objects and reclaims for further use those that are\n"
830 "no longer accessible.")
831 #define FUNC_NAME s_scm_gc
836 return SCM_UNSPECIFIED
;
842 /* {C Interface For When GC is Triggered}
846 adjust_min_yield (scm_freelist_t
*freelist
)
848 /* min yield is adjusted upwards so that next predicted total yield
849 * (allocated cells actually freed by GC) becomes
850 * `min_yield_fraction' of total heap size. Note, however, that
851 * the absolute value of min_yield will correspond to `collected'
852 * on one master (the one which currently is triggering GC).
854 * The reason why we look at total yield instead of cells collected
855 * on one list is that we want to take other freelists into account.
856 * On this freelist, we know that (local) yield = collected cells,
857 * but that's probably not the case on the other lists.
859 * (We might consider computing a better prediction, for example
860 * by computing an average over multiple GC:s.)
862 if (freelist
->min_yield_fraction
)
864 /* Pick largest of last two yields. */
865 int delta
= ((SCM_HEAP_SIZE
* freelist
->min_yield_fraction
/ 100)
866 - (long) SCM_MAX (scm_gc_yield_1
, scm_gc_yield
));
868 fprintf (stderr
, " after GC = %d, delta = %d\n",
873 freelist
->min_yield
+= delta
;
878 /* When we get POSIX threads support, the master will be global and
879 * common while the freelist will be individual for each thread.
883 scm_gc_for_newcell (scm_freelist_t
*master
, SCM
*freelist
)
889 if (SCM_NULLP (master
->clusters
))
891 if (master
->grow_heap_p
|| scm_block_gc
)
893 /* In order to reduce gc frequency, try to allocate a new heap
894 * segment first, even if gc might find some free cells. If we
895 * can't obtain a new heap segment, we will try gc later.
897 master
->grow_heap_p
= 0;
898 alloc_some_heap (master
, return_on_error
);
900 if (SCM_NULLP (master
->clusters
))
902 /* The heap was not grown, either because it wasn't scheduled to
903 * grow, or because there was not enough memory available. In
904 * both cases we have to try gc to get some free cells.
907 fprintf (stderr
, "allocated = %d, ",
909 + master_cells_allocated (&scm_master_freelist
)
910 + master_cells_allocated (&scm_master_freelist2
));
913 adjust_min_yield (master
);
914 if (SCM_NULLP (master
->clusters
))
916 /* gc could not free any cells. Now, we _must_ allocate a
917 * new heap segment, because there is no other possibility
918 * to provide a new cell for the caller.
920 alloc_some_heap (master
, abort_on_error
);
924 cell
= SCM_CAR (master
->clusters
);
925 master
->clusters
= SCM_CDR (master
->clusters
);
926 ++master
->clusters_allocated
;
928 while (SCM_NULLP (cell
));
930 #ifdef GUILE_DEBUG_FREELIST
931 scm_check_freelist (cell
);
935 *freelist
= SCM_FREE_CELL_CDR (cell
);
941 /* This is a support routine which can be used to reserve a cluster
942 * for some special use, such as debugging. It won't be useful until
943 * free cells are preserved between garbage collections.
947 scm_alloc_cluster (scm_freelist_t
*master
)
950 cell
= scm_gc_for_newcell (master
, &freelist
);
951 SCM_SETCDR (cell
, freelist
);
957 scm_c_hook_t scm_before_gc_c_hook
;
958 scm_c_hook_t scm_before_mark_c_hook
;
959 scm_c_hook_t scm_before_sweep_c_hook
;
960 scm_c_hook_t scm_after_sweep_c_hook
;
961 scm_c_hook_t scm_after_gc_c_hook
;
965 scm_igc (const char *what
)
970 scm_c_hook_run (&scm_before_gc_c_hook
, 0);
973 SCM_NULLP (scm_freelist
)
975 : (SCM_NULLP (scm_freelist2
) ? "o" : "m"));
978 /* During the critical section, only the current thread may run. */
979 SCM_THREAD_CRITICAL_SECTION_START
;
982 /* fprintf (stderr, "gc: %s\n", what); */
984 if (!scm_stack_base
|| scm_block_gc
)
990 gc_start_stats (what
);
992 if (scm_mallocated
< 0)
993 /* The byte count of allocated objects has underflowed. This is
994 probably because you forgot to report the sizes of objects you
995 have allocated, by calling scm_done_malloc or some such. When
996 the GC freed them, it subtracted their size from
997 scm_mallocated, which underflowed. */
1000 if (scm_gc_heap_lock
)
1001 /* We've invoked the collector while a GC is already in progress.
1002 That should never happen. */
1007 /* flush dead entries from the continuation stack */
1012 elts
= SCM_VELTS (scm_continuation_stack
);
1013 bound
= SCM_VECTOR_LENGTH (scm_continuation_stack
);
1014 x
= SCM_INUM (scm_continuation_stack_ptr
);
1017 elts
[x
] = SCM_BOOL_F
;
1022 scm_c_hook_run (&scm_before_mark_c_hook
, 0);
1024 clear_mark_space ();
1028 /* Mark objects on the C stack. */
1029 SCM_FLUSH_REGISTER_WINDOWS
;
1030 /* This assumes that all registers are saved into the jmp_buf */
1031 setjmp (scm_save_regs_gc_mark
);
1032 scm_mark_locations ((SCM_STACKITEM
*) scm_save_regs_gc_mark
,
1033 ( (scm_sizet
) (sizeof (SCM_STACKITEM
) - 1 +
1034 sizeof scm_save_regs_gc_mark
)
1035 / sizeof (SCM_STACKITEM
)));
1038 scm_sizet stack_len
= scm_stack_size (scm_stack_base
);
1039 #ifdef SCM_STACK_GROWS_UP
1040 scm_mark_locations (scm_stack_base
, stack_len
);
1042 scm_mark_locations (scm_stack_base
- stack_len
, stack_len
);
1046 #else /* USE_THREADS */
1048 /* Mark every thread's stack and registers */
1049 scm_threads_mark_stacks ();
1051 #endif /* USE_THREADS */
1053 j
= SCM_NUM_PROTECTS
;
1055 scm_gc_mark (scm_sys_protects
[j
]);
1057 /* FIXME: we should have a means to register C functions to be run
1058 * in different phases of GC
1060 scm_mark_subr_table ();
1063 scm_gc_mark (scm_root
->handle
);
1066 t_before_sweep
= scm_c_get_internal_run_time ();
1067 scm_gc_mark_time_taken
+= (t_before_sweep
- t_before_gc
);
1069 scm_c_hook_run (&scm_before_sweep_c_hook
, 0);
1073 scm_c_hook_run (&scm_after_sweep_c_hook
, 0);
1079 SCM_THREAD_CRITICAL_SECTION_END
;
1081 scm_c_hook_run (&scm_after_gc_c_hook
, 0);
1092 /* Mark an object precisely.
1096 #define FUNC_NAME "scm_gc_mark"
1108 if (!SCM_CELLP (ptr
))
1109 SCM_MISC_ERROR ("rogue pointer in heap", SCM_EOL
);
1111 #if (defined (GUILE_DEBUG_FREELIST))
1113 if (SCM_GC_IN_CARD_HEADERP (SCM2PTR (ptr
)))
1114 scm_wta (ptr
, "rogue pointer in heap", NULL
);
1118 if (SCM_GCMARKP (ptr
))
1121 SCM_SETGCMARK (ptr
);
1123 switch (SCM_TYP7 (ptr
))
1125 case scm_tcs_cons_nimcar
:
1126 if (SCM_IMP (SCM_CDR (ptr
)))
1128 ptr
= SCM_CAR (ptr
);
1131 scm_gc_mark (SCM_CAR (ptr
));
1132 ptr
= SCM_CDR (ptr
);
1134 case scm_tcs_cons_imcar
:
1135 ptr
= SCM_CDR (ptr
);
1138 scm_gc_mark (SCM_CELL_OBJECT_2 (ptr
));
1139 ptr
= SCM_CDR (ptr
);
1141 case scm_tcs_cons_gloc
:
1143 /* Dirk:FIXME:: The following code is super ugly: ptr may be a struct
1144 * or a gloc. If it is a gloc, the cell word #0 of ptr is a pointer
1145 * to a heap cell. If it is a struct, the cell word #0 of ptr is a
1146 * pointer to a struct vtable data region. The fact that these are
1147 * accessed in the same way restricts the possibilites to change the
1148 * data layout of structs or heap cells.
1150 scm_bits_t word0
= SCM_CELL_WORD_0 (ptr
) - scm_tc3_cons_gloc
;
1151 scm_bits_t
* vtable_data
= (scm_bits_t
*) word0
; /* access as struct */
1152 if (vtable_data
[scm_vtable_index_vcell
] != 0)
1155 SCM gloc_car
= SCM_PACK (word0
);
1156 scm_gc_mark (gloc_car
);
1157 ptr
= SCM_CDR (ptr
);
1162 /* ptr is a struct */
1163 SCM layout
= SCM_PACK (vtable_data
[scm_vtable_index_layout
]);
1164 int len
= SCM_SYMBOL_LENGTH (layout
);
1165 char * fields_desc
= SCM_SYMBOL_CHARS (layout
);
1166 scm_bits_t
* struct_data
= (scm_bits_t
*) SCM_STRUCT_DATA (ptr
);
1168 if (vtable_data
[scm_struct_i_flags
] & SCM_STRUCTF_ENTITY
)
1170 scm_gc_mark (SCM_PACK (struct_data
[scm_struct_i_procedure
]));
1171 scm_gc_mark (SCM_PACK (struct_data
[scm_struct_i_setter
]));
1177 for (x
= 0; x
< len
- 2; x
+= 2, ++struct_data
)
1178 if (fields_desc
[x
] == 'p')
1179 scm_gc_mark (SCM_PACK (*struct_data
));
1180 if (fields_desc
[x
] == 'p')
1182 if (SCM_LAYOUT_TAILP (fields_desc
[x
+ 1]))
1183 for (x
= *struct_data
; x
; --x
)
1184 scm_gc_mark (SCM_PACK (*++struct_data
));
1186 scm_gc_mark (SCM_PACK (*struct_data
));
1190 ptr
= SCM_PACK (vtable_data
[scm_vtable_index_vtable
]);
1195 case scm_tcs_closures
:
1196 if (SCM_IMP (SCM_CDR (ptr
)))
1198 ptr
= SCM_CLOSCAR (ptr
);
1201 scm_gc_mark (SCM_CLOSCAR (ptr
));
1202 ptr
= SCM_CDR (ptr
);
1204 case scm_tc7_vector
:
1205 i
= SCM_VECTOR_LENGTH (ptr
);
1209 if (SCM_NIMP (SCM_VELTS (ptr
)[i
]))
1210 scm_gc_mark (SCM_VELTS (ptr
)[i
]);
1211 ptr
= SCM_VELTS (ptr
)[0];
1215 i
= SCM_CCLO_LENGTH (ptr
);
1219 if (SCM_NIMP (SCM_VELTS (ptr
)[i
]))
1220 scm_gc_mark (SCM_VELTS (ptr
)[i
]);
1221 ptr
= SCM_VELTS (ptr
)[0];
1224 case scm_tc7_contin
:
1225 if (SCM_VELTS (ptr
))
1226 scm_mark_locations (SCM_VELTS_AS_STACKITEMS (ptr
),
1228 (SCM_CONTINUATION_LENGTH (ptr
) +
1229 (sizeof (SCM_STACKITEM
) + -1 +
1230 sizeof (scm_contregs
)) /
1231 sizeof (SCM_STACKITEM
)));
1235 case scm_tc7_byvect
:
1242 #ifdef HAVE_LONG_LONGS
1243 case scm_tc7_llvect
:
1246 case scm_tc7_string
:
1249 case scm_tc7_substring
:
1250 ptr
= SCM_CDR (ptr
);
1254 SCM_WVECT_GC_CHAIN (ptr
) = scm_weak_vectors
;
1255 scm_weak_vectors
= ptr
;
1256 if (SCM_IS_WHVEC_ANY (ptr
))
1263 len
= SCM_VECTOR_LENGTH (ptr
);
1264 weak_keys
= SCM_IS_WHVEC (ptr
) || SCM_IS_WHVEC_B (ptr
);
1265 weak_values
= SCM_IS_WHVEC_V (ptr
) || SCM_IS_WHVEC_B (ptr
);
1267 for (x
= 0; x
< len
; ++x
)
1270 alist
= SCM_VELTS (ptr
)[x
];
1272 /* mark everything on the alist except the keys or
1273 * values, according to weak_values and weak_keys. */
1274 while ( SCM_CONSP (alist
)
1275 && !SCM_GCMARKP (alist
)
1276 && SCM_CONSP (SCM_CAR (alist
)))
1281 kvpair
= SCM_CAR (alist
);
1282 next_alist
= SCM_CDR (alist
);
1285 * SCM_SETGCMARK (alist);
1286 * SCM_SETGCMARK (kvpair);
1288 * It may be that either the key or value is protected by
1289 * an escaped reference to part of the spine of this alist.
1290 * If we mark the spine here, and only mark one or neither of the
1291 * key and value, they may never be properly marked.
1292 * This leads to a horrible situation in which an alist containing
1293 * freelist cells is exported.
1295 * So only mark the spines of these arrays last of all marking.
1296 * If somebody confuses us by constructing a weak vector
1297 * with a circular alist then we are hosed, but at least we
1298 * won't prematurely drop table entries.
1301 scm_gc_mark (SCM_CAR (kvpair
));
1303 scm_gc_mark (SCM_CDR (kvpair
));
1306 if (SCM_NIMP (alist
))
1307 scm_gc_mark (alist
);
1312 case scm_tc7_symbol
:
1313 ptr
= SCM_PROP_SLOTS (ptr
);
1318 i
= SCM_PTOBNUM (ptr
);
1319 if (!(i
< scm_numptob
))
1321 if (SCM_PTAB_ENTRY(ptr
))
1322 scm_gc_mark (SCM_PTAB_ENTRY(ptr
)->file_name
);
1323 if (scm_ptobs
[i
].mark
)
1325 ptr
= (scm_ptobs
[i
].mark
) (ptr
);
1332 switch (SCM_TYP16 (ptr
))
1333 { /* should be faster than going through scm_smobs */
1334 case scm_tc_free_cell
:
1335 /* printf("found free_cell %X ", ptr); fflush(stdout); */
1338 case scm_tc16_complex
:
1341 i
= SCM_SMOBNUM (ptr
);
1342 if (!(i
< scm_numsmob
))
1344 if (scm_smobs
[i
].mark
)
1346 ptr
= (scm_smobs
[i
].mark
) (ptr
);
1355 SCM_MISC_ERROR ("unknown type", SCM_EOL
);
1361 /* Mark a Region Conservatively
1365 scm_mark_locations (SCM_STACKITEM x
[], scm_sizet n
)
1369 for (m
= 0; m
< n
; ++m
)
1371 SCM obj
= * (SCM
*) &x
[m
];
1372 if (SCM_CELLP (obj
))
1374 SCM_CELLPTR ptr
= SCM2PTR (obj
);
1376 int j
= scm_n_heap_segs
- 1;
1377 if (SCM_PTR_LE (scm_heap_table
[i
].bounds
[0], ptr
)
1378 && SCM_PTR_GT (scm_heap_table
[j
].bounds
[1], ptr
))
1385 || SCM_PTR_GT (scm_heap_table
[i
].bounds
[1], ptr
))
1387 else if (SCM_PTR_LE (scm_heap_table
[j
].bounds
[0], ptr
))
1395 if (SCM_PTR_GT (scm_heap_table
[k
].bounds
[1], ptr
))
1399 if (SCM_PTR_LE (scm_heap_table
[i
].bounds
[0], ptr
))
1404 else if (SCM_PTR_LE (scm_heap_table
[k
].bounds
[0], ptr
))
1408 if (SCM_PTR_GT (scm_heap_table
[j
].bounds
[1], ptr
))
1415 if (SCM_GC_IN_CARD_HEADERP (ptr
))
1418 if (scm_heap_table
[seg_id
].span
== 1
1419 || SCM_DOUBLE_CELLP (obj
))
1430 /* The function scm_cellp determines whether an SCM value can be regarded as a
1431 * pointer to a cell on the heap. Binary search is used in order to determine
1432 * the heap segment that contains the cell.
1435 scm_cellp (SCM value
)
1437 if (SCM_CELLP (value
)) {
1438 scm_cell
* ptr
= SCM2PTR (value
);
1440 unsigned int j
= scm_n_heap_segs
- 1;
1443 int k
= (i
+ j
) / 2;
1444 if (SCM_PTR_GT (scm_heap_table
[k
].bounds
[1], ptr
)) {
1446 } else if (SCM_PTR_LE (scm_heap_table
[k
].bounds
[0], ptr
)) {
1451 if (SCM_PTR_LE (scm_heap_table
[i
].bounds
[0], ptr
)
1452 && SCM_PTR_GT (scm_heap_table
[i
].bounds
[1], ptr
)
1453 && (scm_heap_table
[i
].span
== 1 || SCM_DOUBLE_CELLP (value
))
1454 && !SCM_GC_IN_CARD_HEADERP (ptr
)
1465 gc_sweep_freelist_start (scm_freelist_t
*freelist
)
1467 freelist
->cells
= SCM_EOL
;
1468 freelist
->left_to_collect
= freelist
->cluster_size
;
1469 freelist
->clusters_allocated
= 0;
1470 freelist
->clusters
= SCM_EOL
;
1471 freelist
->clustertail
= &freelist
->clusters
;
1472 freelist
->collected_1
= freelist
->collected
;
1473 freelist
->collected
= 0;
1477 gc_sweep_freelist_finish (scm_freelist_t
*freelist
)
1480 *freelist
->clustertail
= freelist
->cells
;
1481 if (!SCM_NULLP (freelist
->cells
))
1483 SCM c
= freelist
->cells
;
1484 SCM_SETCAR (c
, SCM_CDR (c
));
1485 SCM_SETCDR (c
, SCM_EOL
);
1486 freelist
->collected
+=
1487 freelist
->span
* (freelist
->cluster_size
- freelist
->left_to_collect
);
1489 scm_gc_cells_collected
+= freelist
->collected
;
1491 /* Although freelist->min_yield is used to test freelist->collected
1492 * (which is the local GC yield for freelist), it is adjusted so
1493 * that *total* yield is freelist->min_yield_fraction of total heap
1494 * size. This means that a too low yield is compensated by more
1495 * heap on the list which is currently doing most work, which is
1496 * just what we want.
1498 collected
= SCM_MAX (freelist
->collected_1
, freelist
->collected
);
1499 freelist
->grow_heap_p
= (collected
< freelist
->min_yield
);
1502 #define NEXT_DATA_CELL(ptr, span) \
1504 scm_cell *nxt__ = CELL_UP ((char *) (ptr) + 1, (span)); \
1505 (ptr) = (SCM_GC_IN_CARD_HEADERP (nxt__) ? \
1506 CELL_UP (SCM_GC_CELL_CARD (nxt__) + SCM_GC_CARD_N_HEADER_CELLS, span) \
1512 #define FUNC_NAME "scm_gc_sweep"
1514 register SCM_CELLPTR ptr
;
1515 register SCM nfreelist
;
1516 register scm_freelist_t
*freelist
;
1524 gc_sweep_freelist_start (&scm_master_freelist
);
1525 gc_sweep_freelist_start (&scm_master_freelist2
);
1527 for (i
= 0; i
< scm_n_heap_segs
; i
++)
1529 register unsigned int left_to_collect
;
1530 register scm_sizet j
;
1532 /* Unmarked cells go onto the front of the freelist this heap
1533 segment points to. Rather than updating the real freelist
1534 pointer as we go along, we accumulate the new head in
1535 nfreelist. Then, if it turns out that the entire segment is
1536 free, we free (i.e., malloc's free) the whole segment, and
1537 simply don't assign nfreelist back into the real freelist. */
1538 freelist
= scm_heap_table
[i
].freelist
;
1539 nfreelist
= freelist
->cells
;
1540 left_to_collect
= freelist
->left_to_collect
;
1541 span
= scm_heap_table
[i
].span
;
1543 ptr
= CELL_UP (scm_heap_table
[i
].bounds
[0], span
);
1544 seg_size
= CELL_DN (scm_heap_table
[i
].bounds
[1], span
) - ptr
;
1546 /* use only data cells in seg_size */
1547 seg_size
= (seg_size
/ SCM_GC_CARD_N_CELLS
) * (SCM_GC_CARD_N_DATA_CELLS
/ span
) * span
;
1549 scm_gc_cells_swept
+= seg_size
;
1551 for (j
= seg_size
+ span
; j
-= span
; ptr
+= span
)
1555 if (SCM_GC_IN_CARD_HEADERP (ptr
))
1561 NEXT_DATA_CELL (nxt
, span
);
1568 scmptr
= PTR2SCM (ptr
);
1570 if (SCM_GCMARKP (scmptr
))
1573 switch SCM_TYP7 (scmptr
)
1575 case scm_tcs_cons_gloc
:
1577 /* Dirk:FIXME:: Again, super ugly code: scmptr may be a
1578 * struct or a gloc. See the corresponding comment in
1581 scm_bits_t word0
= (SCM_CELL_WORD_0 (scmptr
)
1582 - scm_tc3_cons_gloc
);
1583 /* access as struct */
1584 scm_bits_t
* vtable_data
= (scm_bits_t
*) word0
;
1585 if (vtable_data
[scm_vtable_index_vcell
] == 0)
1587 /* Structs need to be freed in a special order.
1588 * This is handled by GC C hooks in struct.c.
1590 SCM_SET_STRUCT_GC_CHAIN (scmptr
, scm_structs_to_free
);
1591 scm_structs_to_free
= scmptr
;
1594 /* fall through so that scmptr gets collected */
1597 case scm_tcs_cons_imcar
:
1598 case scm_tcs_cons_nimcar
:
1599 case scm_tcs_closures
:
1603 m
+= (2 + SCM_VECTOR_LENGTH (scmptr
)) * sizeof (SCM
);
1604 scm_must_free (SCM_VECTOR_BASE (scmptr
) - 2);
1606 case scm_tc7_vector
:
1608 unsigned long int length
= SCM_VECTOR_LENGTH (scmptr
);
1611 m
+= length
* sizeof (scm_bits_t
);
1612 scm_must_free (SCM_VECTOR_BASE (scmptr
));
1618 m
+= (SCM_CCLO_LENGTH (scmptr
) * sizeof (SCM
));
1619 scm_must_free (SCM_CCLO_BASE (scmptr
));
1624 m
+= sizeof (long) * ((SCM_BITVECTOR_LENGTH (scmptr
) + SCM_LONG_BIT
- 1) / SCM_LONG_BIT
);
1625 scm_must_free (SCM_BITVECTOR_BASE (scmptr
));
1627 case scm_tc7_byvect
:
1631 #ifdef HAVE_LONG_LONGS
1632 case scm_tc7_llvect
:
1637 m
+= SCM_UVECTOR_LENGTH (scmptr
) * scm_uniform_element_size (scmptr
);
1638 scm_must_free (SCM_UVECTOR_BASE (scmptr
));
1641 case scm_tc7_substring
:
1643 case scm_tc7_string
:
1644 m
+= SCM_STRING_LENGTH (scmptr
) + 1;
1645 scm_must_free (SCM_STRING_CHARS (scmptr
));
1647 case scm_tc7_symbol
:
1648 m
+= SCM_SYMBOL_LENGTH (scmptr
) + 1;
1649 scm_must_free (SCM_SYMBOL_CHARS (scmptr
));
1651 case scm_tc7_contin
:
1652 m
+= SCM_CONTINUATION_LENGTH (scmptr
) * sizeof (SCM_STACKITEM
)
1653 + sizeof (scm_contregs
);
1654 scm_must_free (SCM_CONTREGS (scmptr
));
1657 /* the various "subrs" (primitives) are never freed */
1660 if SCM_OPENP (scmptr
)
1662 int k
= SCM_PTOBNUM (scmptr
);
1663 if (!(k
< scm_numptob
))
1665 /* Keep "revealed" ports alive. */
1666 if (scm_revealed_count (scmptr
) > 0)
1668 /* Yes, I really do mean scm_ptobs[k].free */
1669 /* rather than ftobs[k].close. .close */
1670 /* is for explicit CLOSE-PORT by user */
1671 m
+= (scm_ptobs
[k
].free
) (scmptr
);
1672 SCM_SETSTREAM (scmptr
, 0);
1673 scm_remove_from_port_table (scmptr
);
1674 scm_gc_ports_collected
++;
1675 SCM_SETAND_CAR (scmptr
, ~SCM_OPN
);
1679 switch SCM_TYP16 (scmptr
)
1681 case scm_tc_free_cell
:
1686 m
+= (SCM_NUMDIGS (scmptr
) * SCM_BITSPERDIG
/ SCM_CHAR_BIT
);
1687 scm_must_free (SCM_BDIGITS (scmptr
));
1689 #endif /* def SCM_BIGDIG */
1690 case scm_tc16_complex
:
1691 m
+= sizeof (scm_complex_t
);
1692 scm_must_free (SCM_COMPLEX_MEM (scmptr
));
1697 k
= SCM_SMOBNUM (scmptr
);
1698 if (!(k
< scm_numsmob
))
1700 m
+= (scm_smobs
[k
].free
) (scmptr
);
1707 SCM_MISC_ERROR ("unknown type", SCM_EOL
);
1710 if (!--left_to_collect
)
1712 SCM_SETCAR (scmptr
, nfreelist
);
1713 *freelist
->clustertail
= scmptr
;
1714 freelist
->clustertail
= SCM_CDRLOC (scmptr
);
1716 nfreelist
= SCM_EOL
;
1717 freelist
->collected
+= span
* freelist
->cluster_size
;
1718 left_to_collect
= freelist
->cluster_size
;
1722 /* Stick the new cell on the front of nfreelist. It's
1723 critical that we mark this cell as freed; otherwise, the
1724 conservative collector might trace it as some other type
1726 SCM_SET_CELL_TYPE (scmptr
, scm_tc_free_cell
);
1727 SCM_SET_FREE_CELL_CDR (scmptr
, nfreelist
);
1732 #ifdef GC_FREE_SEGMENTS
1737 freelist
->heap_size
-= seg_size
;
1738 free ((char *) scm_heap_table
[i
].bounds
[0]);
1739 scm_heap_table
[i
].bounds
[0] = 0;
1740 for (j
= i
+ 1; j
< scm_n_heap_segs
; j
++)
1741 scm_heap_table
[j
- 1] = scm_heap_table
[j
];
1742 scm_n_heap_segs
-= 1;
1743 i
--; /* We need to scan the segment just moved. */
1746 #endif /* ifdef GC_FREE_SEGMENTS */
1748 /* Update the real freelist pointer to point to the head of
1749 the list of free cells we've built for this segment. */
1750 freelist
->cells
= nfreelist
;
1751 freelist
->left_to_collect
= left_to_collect
;
1754 #ifdef GUILE_DEBUG_FREELIST
1755 scm_map_free_list ();
1759 gc_sweep_freelist_finish (&scm_master_freelist
);
1760 gc_sweep_freelist_finish (&scm_master_freelist2
);
1762 /* When we move to POSIX threads private freelists should probably
1763 be GC-protected instead. */
1764 scm_freelist
= SCM_EOL
;
1765 scm_freelist2
= SCM_EOL
;
1767 scm_cells_allocated
= (SCM_HEAP_SIZE
- scm_gc_cells_collected
);
1768 scm_gc_yield
-= scm_cells_allocated
;
1769 scm_mallocated
-= m
;
1770 scm_gc_malloc_collected
= m
;
1776 /* {Front end to malloc}
1778 * scm_must_malloc, scm_must_realloc, scm_must_free, scm_done_malloc,
1781 * These functions provide services comperable to malloc, realloc, and
1782 * free. They are for allocating malloced parts of scheme objects.
1783 * The primary purpose of the front end is to impose calls to gc. */
1787 * Return newly malloced storage or throw an error.
1789 * The parameter WHAT is a string for error reporting.
1790 * If the threshold scm_mtrigger will be passed by this
1791 * allocation, or if the first call to malloc fails,
1792 * garbage collect -- on the presumption that some objects
1793 * using malloced storage may be collected.
1795 * The limit scm_mtrigger may be raised by this allocation.
1798 scm_must_malloc (scm_sizet size
, const char *what
)
1801 unsigned long nm
= scm_mallocated
+ size
;
1803 if (nm
<= scm_mtrigger
)
1805 SCM_SYSCALL (ptr
= malloc (size
));
1808 scm_mallocated
= nm
;
1809 #ifdef GUILE_DEBUG_MALLOC
1810 scm_malloc_register (ptr
, what
);
1818 nm
= scm_mallocated
+ size
;
1819 SCM_SYSCALL (ptr
= malloc (size
));
1822 scm_mallocated
= nm
;
1823 if (nm
> scm_mtrigger
- SCM_MTRIGGER_HYSTERESIS
) {
1824 if (nm
> scm_mtrigger
)
1825 scm_mtrigger
= nm
+ nm
/ 2;
1827 scm_mtrigger
+= scm_mtrigger
/ 2;
1829 #ifdef GUILE_DEBUG_MALLOC
1830 scm_malloc_register (ptr
, what
);
1836 scm_memory_error (what
);
1841 * is similar to scm_must_malloc.
1844 scm_must_realloc (void *where
,
1850 scm_sizet nm
= scm_mallocated
+ size
- old_size
;
1852 if (nm
<= scm_mtrigger
)
1854 SCM_SYSCALL (ptr
= realloc (where
, size
));
1857 scm_mallocated
= nm
;
1858 #ifdef GUILE_DEBUG_MALLOC
1859 scm_malloc_reregister (where
, ptr
, what
);
1867 nm
= scm_mallocated
+ size
- old_size
;
1868 SCM_SYSCALL (ptr
= realloc (where
, size
));
1871 scm_mallocated
= nm
;
1872 if (nm
> scm_mtrigger
- SCM_MTRIGGER_HYSTERESIS
) {
1873 if (nm
> scm_mtrigger
)
1874 scm_mtrigger
= nm
+ nm
/ 2;
1876 scm_mtrigger
+= scm_mtrigger
/ 2;
1878 #ifdef GUILE_DEBUG_MALLOC
1879 scm_malloc_reregister (where
, ptr
, what
);
1884 scm_memory_error (what
);
1889 scm_must_free (void *obj
)
1890 #define FUNC_NAME "scm_must_free"
1892 #ifdef GUILE_DEBUG_MALLOC
1893 scm_malloc_unregister (obj
);
1898 SCM_MISC_ERROR ("freeing NULL pointer", SCM_EOL
);
1903 /* Announce that there has been some malloc done that will be freed
1904 * during gc. A typical use is for a smob that uses some malloced
1905 * memory but can not get it from scm_must_malloc (for whatever
1906 * reason). When a new object of this smob is created you call
1907 * scm_done_malloc with the size of the object. When your smob free
1908 * function is called, be sure to include this size in the return
1911 * If you can't actually free the memory in the smob free function,
1912 * for whatever reason (like reference counting), you still can (and
1913 * should) report the amount of memory freed when you actually free it.
1914 * Do it by calling scm_done_malloc with the _negated_ size. Clever,
1915 * eh? Or even better, call scm_done_free. */
1918 scm_done_malloc (long size
)
1920 scm_mallocated
+= size
;
1922 if (scm_mallocated
> scm_mtrigger
)
1924 scm_igc ("foreign mallocs");
1925 if (scm_mallocated
> scm_mtrigger
- SCM_MTRIGGER_HYSTERESIS
)
1927 if (scm_mallocated
> scm_mtrigger
)
1928 scm_mtrigger
= scm_mallocated
+ scm_mallocated
/ 2;
1930 scm_mtrigger
+= scm_mtrigger
/ 2;
1936 scm_done_free (long size
)
1938 scm_mallocated
-= size
;
1945 * Each heap segment is an array of objects of a particular size.
1946 * Every segment has an associated (possibly shared) freelist.
1947 * A table of segment records is kept that records the upper and
1948 * lower extents of the segment; this is used during the conservative
1949 * phase of gc to identify probably gc roots (because they point
1950 * into valid segments at reasonable offsets). */
1953 * is true if the first segment was smaller than INIT_HEAP_SEG.
1954 * If scm_expmem is set to one, subsequent segment allocations will
1955 * allocate segments of size SCM_EXPHEAP(scm_heap_size).
1959 scm_sizet scm_max_segment_size
;
1962 * is the lowest base address of any heap segment.
1964 SCM_CELLPTR scm_heap_org
;
1966 scm_heap_seg_data_t
* scm_heap_table
= 0;
1967 static unsigned int heap_segment_table_size
= 0;
1968 int scm_n_heap_segs
= 0;
1971 * initializes a new heap segment and returns the number of objects it contains.
1973 * The segment origin and segment size in bytes are input parameters.
1974 * The freelist is both input and output.
1976 * This function presumes that the scm_heap_table has already been expanded
1977 * to accomodate a new segment record and that the markbit space was reserved
1978 * for all the cards in this segment.
1981 #define INIT_CARD(card, span) \
1983 SCM_GC_CARD_BVEC (card) = get_bvec (); \
1985 SCM_GC_SET_CARD_DOUBLECELL (card); \
1989 init_heap_seg (SCM_CELLPTR seg_org
, scm_sizet size
, scm_freelist_t
*freelist
)
1991 register SCM_CELLPTR ptr
;
1992 SCM_CELLPTR seg_end
;
1995 int span
= freelist
->span
;
1997 if (seg_org
== NULL
)
2000 /* Align the begin ptr up.
2002 ptr
= SCM_GC_CARD_UP (seg_org
);
2004 /* Compute the ceiling on valid object pointers w/in this segment.
2006 seg_end
= SCM_GC_CARD_DOWN ((char *)seg_org
+ size
);
2008 /* Find the right place and insert the segment record.
2011 for (new_seg_index
= 0;
2012 ( (new_seg_index
< scm_n_heap_segs
)
2013 && SCM_PTR_LE (scm_heap_table
[new_seg_index
].bounds
[0], seg_org
));
2019 for (i
= scm_n_heap_segs
; i
> new_seg_index
; --i
)
2020 scm_heap_table
[i
] = scm_heap_table
[i
- 1];
2025 scm_heap_table
[new_seg_index
].span
= span
;
2026 scm_heap_table
[new_seg_index
].freelist
= freelist
;
2027 scm_heap_table
[new_seg_index
].bounds
[0] = ptr
;
2028 scm_heap_table
[new_seg_index
].bounds
[1] = seg_end
;
2031 n_new_cells
= seg_end
- ptr
;
2033 freelist
->heap_size
+= n_new_cells
;
2035 /* Partition objects in this segment into clusters */
2038 SCM
*clusterp
= &clusters
;
2040 NEXT_DATA_CELL (ptr
, span
);
2041 while (ptr
< seg_end
)
2043 scm_cell
*nxt
= ptr
;
2044 scm_cell
*prv
= NULL
;
2045 scm_cell
*last_card
= NULL
;
2046 int n_data_cells
= (SCM_GC_CARD_N_DATA_CELLS
/ span
) * SCM_CARDS_PER_CLUSTER
- 1;
2047 NEXT_DATA_CELL(nxt
, span
);
2049 /* Allocate cluster spine
2051 *clusterp
= PTR2SCM (ptr
);
2052 SCM_SETCAR (*clusterp
, PTR2SCM (nxt
));
2053 clusterp
= SCM_CDRLOC (*clusterp
);
2056 while (n_data_cells
--)
2058 scm_cell
*card
= SCM_GC_CELL_CARD (ptr
);
2059 SCM scmptr
= PTR2SCM (ptr
);
2061 NEXT_DATA_CELL (nxt
, span
);
2064 if (card
!= last_card
)
2066 INIT_CARD (card
, span
);
2070 SCM_SET_CELL_TYPE (scmptr
, scm_tc_free_cell
);
2071 SCM_SETCDR (scmptr
, PTR2SCM (nxt
));
2076 SCM_SET_FREE_CELL_CDR (PTR2SCM (prv
), SCM_EOL
);
2081 scm_cell
*ref
= seg_end
;
2082 NEXT_DATA_CELL (ref
, span
);
2084 /* [cmm] looks like the segment size doesn't divide cleanly by
2085 cluster size. bad cmm! */
2089 /* Patch up the last cluster pointer in the segment
2090 * to join it to the input freelist.
2092 *clusterp
= freelist
->clusters
;
2093 freelist
->clusters
= clusters
;
2097 fprintf (stderr
, "H");
2103 round_to_cluster_size (scm_freelist_t
*freelist
, scm_sizet len
)
2105 scm_sizet cluster_size_in_bytes
= CLUSTER_SIZE_IN_BYTES (freelist
);
2108 (len
+ cluster_size_in_bytes
- 1) / cluster_size_in_bytes
* cluster_size_in_bytes
2109 + ALIGNMENT_SLACK (freelist
);
2113 alloc_some_heap (scm_freelist_t
*freelist
, policy_on_error error_policy
)
2114 #define FUNC_NAME "alloc_some_heap"
2119 if (scm_gc_heap_lock
)
2121 /* Critical code sections (such as the garbage collector) aren't
2122 * supposed to add heap segments.
2124 fprintf (stderr
, "alloc_some_heap: Can not extend locked heap.\n");
2128 if (scm_n_heap_segs
== heap_segment_table_size
)
2130 /* We have to expand the heap segment table to have room for the new
2131 * segment. Do not yet increment scm_n_heap_segs -- that is done by
2132 * init_heap_seg only if the allocation of the segment itself succeeds.
2134 unsigned int new_table_size
= scm_n_heap_segs
+ 1;
2135 size_t size
= new_table_size
* sizeof (scm_heap_seg_data_t
);
2136 scm_heap_seg_data_t
* new_heap_table
;
2138 SCM_SYSCALL (new_heap_table
= ((scm_heap_seg_data_t
*)
2139 realloc ((char *)scm_heap_table
, size
)));
2140 if (!new_heap_table
)
2142 if (error_policy
== abort_on_error
)
2144 fprintf (stderr
, "alloc_some_heap: Could not grow heap segment table.\n");
2154 scm_heap_table
= new_heap_table
;
2155 heap_segment_table_size
= new_table_size
;
2159 /* Pick a size for the new heap segment.
2160 * The rule for picking the size of a segment is explained in
2164 /* Assure that the new segment is predicted to be large enough.
2166 * New yield should at least equal GC fraction of new heap size, i.e.
2168 * y + dh > f * (h + dh)
2171 * f : min yield fraction
2173 * dh : size of new heap segment
2175 * This gives dh > (f * h - y) / (1 - f)
2177 int f
= freelist
->min_yield_fraction
;
2178 long h
= SCM_HEAP_SIZE
;
2179 long min_cells
= (f
* h
- 100 * (long) scm_gc_yield
) / (99 - f
);
2180 len
= SCM_EXPHEAP (freelist
->heap_size
);
2182 fprintf (stderr
, "(%d < %d)", len
, min_cells
);
2184 if (len
< min_cells
)
2185 len
= min_cells
+ freelist
->cluster_size
;
2186 len
*= sizeof (scm_cell
);
2187 /* force new sampling */
2188 freelist
->collected
= LONG_MAX
;
2191 if (len
> scm_max_segment_size
)
2192 len
= scm_max_segment_size
;
2197 smallest
= CLUSTER_SIZE_IN_BYTES (freelist
);
2202 /* Allocate with decaying ambition. */
2203 while ((len
>= SCM_MIN_HEAP_SEG_SIZE
)
2204 && (len
>= smallest
))
2206 scm_sizet rounded_len
= round_to_cluster_size (freelist
, len
);
2207 SCM_SYSCALL (ptr
= (SCM_CELLPTR
) malloc (rounded_len
));
2210 init_heap_seg (ptr
, rounded_len
, freelist
);
2217 if (error_policy
== abort_on_error
)
2219 fprintf (stderr
, "alloc_some_heap: Could not grow heap.\n");
2226 SCM_DEFINE (scm_unhash_name
, "unhash-name", 1, 0, 0,
2229 #define FUNC_NAME s_scm_unhash_name
2233 SCM_VALIDATE_SYMBOL (1,name
);
2235 bound
= scm_n_heap_segs
;
2236 for (x
= 0; x
< bound
; ++x
)
2240 p
= scm_heap_table
[x
].bounds
[0];
2241 pbound
= scm_heap_table
[x
].bounds
[1];
2244 SCM cell
= PTR2SCM (p
);
2245 if (SCM_TYP3 (cell
) == scm_tc3_cons_gloc
)
2247 /* Dirk:FIXME:: Again, super ugly code: cell may be a gloc or a
2248 * struct cell. See the corresponding comment in scm_gc_mark.
2250 scm_bits_t word0
= SCM_CELL_WORD_0 (cell
) - scm_tc3_cons_gloc
;
2251 SCM gloc_car
= SCM_PACK (word0
); /* access as gloc */
2252 SCM vcell
= SCM_CELL_OBJECT_1 (gloc_car
);
2253 if ((SCM_EQ_P (name
, SCM_BOOL_T
) || SCM_EQ_P (SCM_CAR (gloc_car
), name
))
2254 && (SCM_UNPACK (vcell
) != 0) && (SCM_UNPACK (vcell
) != 1))
2256 SCM_SET_CELL_OBJECT_0 (cell
, name
);
2269 /* {GC Protection Helper Functions}
2274 scm_remember (SCM
*ptr
)
2279 These crazy functions prevent garbage collection
2280 of arguments after the first argument by
2281 ensuring they remain live throughout the
2282 function because they are used in the last
2283 line of the code block.
2284 It'd be better to have a nice compiler hint to
2285 aid the conservative stack-scanning GC. --03/09/00 gjb */
2287 scm_return_first (SCM elt
, ...)
2293 scm_return_first_int (int i
, ...)
2300 scm_permanent_object (SCM obj
)
2303 scm_permobjs
= scm_cons (obj
, scm_permobjs
);
2309 /* Protect OBJ from the garbage collector. OBJ will not be freed, even if all
2310 other references are dropped, until the object is unprotected by calling
2311 scm_unprotect_object (OBJ). Calls to scm_protect/unprotect_object nest,
2312 i. e. it is possible to protect the same object several times, but it is
2313 necessary to unprotect the object the same number of times to actually get
2314 the object unprotected. It is an error to unprotect an object more often
2315 than it has been protected before. The function scm_protect_object returns
2319 /* Implementation note: For every object X, there is a counter which
2320 scm_protect_object(X) increments and scm_unprotect_object(X) decrements.
2324 scm_protect_object (SCM obj
)
2328 /* This critical section barrier will be replaced by a mutex. */
2331 handle
= scm_hashq_create_handle_x (scm_protects
, obj
, SCM_MAKINUM (0));
2332 SCM_SETCDR (handle
, SCM_MAKINUM (SCM_INUM (SCM_CDR (handle
)) + 1));
2340 /* Remove any protection for OBJ established by a prior call to
2341 scm_protect_object. This function returns OBJ.
2343 See scm_protect_object for more information. */
2345 scm_unprotect_object (SCM obj
)
2349 /* This critical section barrier will be replaced by a mutex. */
2352 handle
= scm_hashq_get_handle (scm_protects
, obj
);
2354 if (SCM_IMP (handle
))
2356 fprintf (stderr
, "scm_unprotect_object called on unprotected object\n");
2361 unsigned long int count
= SCM_INUM (SCM_CDR (handle
)) - 1;
2363 scm_hashq_remove_x (scm_protects
, obj
);
2365 SCM_SETCDR (handle
, SCM_MAKINUM (count
));
2375 /* called on process termination. */
2381 extern int on_exit (void (*procp
) (), int arg
);
2384 cleanup (int status
, void *arg
)
2386 #error Dont know how to setup a cleanup handler on your system.
2391 scm_flush_all_ports ();
2396 make_initial_segment (scm_sizet init_heap_size
, scm_freelist_t
*freelist
)
2398 scm_sizet rounded_size
= round_to_cluster_size (freelist
, init_heap_size
);
2400 if (!init_heap_seg ((SCM_CELLPTR
) malloc (rounded_size
),
2404 rounded_size
= round_to_cluster_size (freelist
, SCM_HEAP_SEG_SIZE
);
2405 if (!init_heap_seg ((SCM_CELLPTR
) malloc (rounded_size
),
2413 if (freelist
->min_yield_fraction
)
2414 freelist
->min_yield
= (freelist
->heap_size
* freelist
->min_yield_fraction
2416 freelist
->grow_heap_p
= (freelist
->heap_size
< freelist
->min_yield
);
2423 init_freelist (scm_freelist_t
*freelist
,
2428 freelist
->clusters
= SCM_EOL
;
2429 freelist
->cluster_size
= cluster_size
+ 1;
2430 freelist
->left_to_collect
= 0;
2431 freelist
->clusters_allocated
= 0;
2432 freelist
->min_yield
= 0;
2433 freelist
->min_yield_fraction
= min_yield
;
2434 freelist
->span
= span
;
2435 freelist
->collected
= 0;
2436 freelist
->collected_1
= 0;
2437 freelist
->heap_size
= 0;
2441 scm_init_storage (scm_sizet init_heap_size_1
, int gc_trigger_1
,
2442 scm_sizet init_heap_size_2
, int gc_trigger_2
,
2443 scm_sizet max_segment_size
)
2447 if (!init_heap_size_1
)
2448 init_heap_size_1
= scm_default_init_heap_size_1
;
2449 if (!init_heap_size_2
)
2450 init_heap_size_2
= scm_default_init_heap_size_2
;
2452 j
= SCM_NUM_PROTECTS
;
2454 scm_sys_protects
[--j
] = SCM_BOOL_F
;
2457 scm_freelist
= SCM_EOL
;
2458 scm_freelist2
= SCM_EOL
;
2459 init_freelist (&scm_master_freelist
,
2460 1, SCM_CLUSTER_SIZE_1
,
2461 gc_trigger_1
? gc_trigger_1
: scm_default_min_yield_1
);
2462 init_freelist (&scm_master_freelist2
,
2463 2, SCM_CLUSTER_SIZE_2
,
2464 gc_trigger_2
? gc_trigger_2
: scm_default_min_yield_2
);
2465 scm_max_segment_size
2466 = max_segment_size
? max_segment_size
: scm_default_max_segment_size
;
2470 j
= SCM_HEAP_SEG_SIZE
;
2471 scm_mtrigger
= SCM_INIT_MALLOC_LIMIT
;
2472 scm_heap_table
= ((scm_heap_seg_data_t
*)
2473 scm_must_malloc (sizeof (scm_heap_seg_data_t
) * 2, "hplims"));
2474 heap_segment_table_size
= 2;
2476 mark_space_ptr
= &mark_space_head
;
2478 if (make_initial_segment (init_heap_size_1
, &scm_master_freelist
) ||
2479 make_initial_segment (init_heap_size_2
, &scm_master_freelist2
))
2482 /* scm_hplims[0] can change. do not remove scm_heap_org */
2483 scm_heap_org
= CELL_UP (scm_heap_table
[0].bounds
[0], 1);
2485 scm_c_hook_init (&scm_before_gc_c_hook
, 0, SCM_C_HOOK_NORMAL
);
2486 scm_c_hook_init (&scm_before_mark_c_hook
, 0, SCM_C_HOOK_NORMAL
);
2487 scm_c_hook_init (&scm_before_sweep_c_hook
, 0, SCM_C_HOOK_NORMAL
);
2488 scm_c_hook_init (&scm_after_sweep_c_hook
, 0, SCM_C_HOOK_NORMAL
);
2489 scm_c_hook_init (&scm_after_gc_c_hook
, 0, SCM_C_HOOK_NORMAL
);
2491 /* Initialise the list of ports. */
2492 scm_port_table
= (scm_port
**)
2493 malloc (sizeof (scm_port
*) * scm_port_table_room
);
2494 if (!scm_port_table
)
2501 on_exit (cleanup
, 0);
2505 scm_undefineds
= scm_cons (SCM_UNDEFINED
, SCM_EOL
);
2506 SCM_SETCDR (scm_undefineds
, scm_undefineds
);
2508 scm_listofnull
= scm_cons (SCM_EOL
, SCM_EOL
);
2509 scm_nullstr
= scm_makstr (0L, 0);
2510 scm_nullvect
= scm_make_vector (SCM_INUM0
, SCM_UNDEFINED
);
2511 scm_symhash
= scm_make_vector (SCM_MAKINUM (scm_symhash_dim
), SCM_EOL
);
2512 scm_weak_symhash
= scm_make_weak_key_hash_table (SCM_MAKINUM (scm_symhash_dim
));
2513 scm_symhash_vars
= scm_make_vector (SCM_MAKINUM (scm_symhash_dim
), SCM_EOL
);
2514 scm_stand_in_procs
= SCM_EOL
;
2515 scm_permobjs
= SCM_EOL
;
2516 scm_protects
= scm_make_vector (SCM_MAKINUM (31), SCM_EOL
);
2517 scm_sysintern ("most-positive-fixnum", SCM_MAKINUM (SCM_MOST_POSITIVE_FIXNUM
));
2518 scm_sysintern ("most-negative-fixnum", SCM_MAKINUM (SCM_MOST_NEGATIVE_FIXNUM
));
2520 scm_sysintern ("bignum-radix", SCM_MAKINUM (SCM_BIGRAD
));
2528 SCM scm_after_gc_hook
;
2530 #if (SCM_DEBUG_DEPRECATED == 0)
2531 static SCM scm_gc_vcell
; /* the vcell for gc-thunk. */
2532 #endif /* SCM_DEBUG_DEPRECATED == 0 */
2533 static SCM gc_async
;
2536 /* The function gc_async_thunk causes the execution of the after-gc-hook. It
2537 * is run after the gc, as soon as the asynchronous events are handled by the
2541 gc_async_thunk (void)
2543 scm_c_run_hook (scm_after_gc_hook
, SCM_EOL
);
2545 #if (SCM_DEBUG_DEPRECATED == 0)
2547 /* The following code will be removed in Guile 1.5. */
2548 if (SCM_NFALSEP (scm_gc_vcell
))
2550 SCM proc
= SCM_CDR (scm_gc_vcell
);
2552 if (SCM_NFALSEP (proc
) && !SCM_UNBNDP (proc
))
2553 scm_apply (proc
, SCM_EOL
, SCM_EOL
);
2556 #endif /* SCM_DEBUG_DEPRECATED == 0 */
2558 return SCM_UNSPECIFIED
;
2562 /* The function mark_gc_async is run by the scm_after_gc_c_hook at the end of
2563 * the garbage collection. The only purpose of this function is to mark the
2564 * gc_async (which will eventually lead to the execution of the
2568 mark_gc_async (void * hook_data
, void *func_data
, void *data
)
2570 scm_system_async_mark (gc_async
);
2580 scm_after_gc_hook
= scm_create_hook ("after-gc-hook", 0);
2582 #if (SCM_DEBUG_DEPRECATED == 0)
2583 scm_gc_vcell
= scm_sysintern ("gc-thunk", SCM_BOOL_F
);
2584 #endif /* SCM_DEBUG_DEPRECATED == 0 */
2585 /* Dirk:FIXME:: We don't really want a binding here. */
2586 after_gc_thunk
= scm_make_gsubr ("%gc-thunk", 0, 0, 0, gc_async_thunk
);
2587 gc_async
= scm_system_async (after_gc_thunk
);
2589 scm_c_hook_add (&scm_after_gc_c_hook
, mark_gc_async
, NULL
, 0);
2591 #include "libguile/gc.x"