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* gc.c (scm_gc_sweep): Free the SCM_VELTS of a scm_tc7_contin only

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when they are non-NULL.
(scm_gc_mark): Likewise, mark only when non-NULL.

* gc.c (scm_done_malloc): New function.
gc.h (scm_done_malloc): New prototype.
This commit is contained in:
Marius Vollmer 1997-10-02 14:45:09 +00:00
parent 5fccacb91b
commit c68296f8fd
1 changed files with 42 additions and 11 deletions
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53
libguile/gc.c
View file

@ -441,6 +441,8 @@ scm_igc (what)
SCM_THREAD_CRITICAL_SECTION_START;
#endif
// fprintf (stderr, "gc: %s\n", what);
scm_gc_start (what);
if (!scm_stack_base || scm_block_gc)
{
@ -689,11 +691,13 @@ gc_mark_nimp:
if SCM_GC8MARKP
(ptr) break;
SCM_SETGC8MARK (ptr);
scm_mark_locations (SCM_VELTS (ptr),
(scm_sizet)
(SCM_LENGTH (ptr) +
(sizeof (SCM_STACKITEM) + -1 + sizeof (scm_contregs)) /
sizeof (SCM_STACKITEM)));
if (SCM_VELTS (ptr))
scm_mark_locations (SCM_VELTS (ptr),
(scm_sizet)
(SCM_LENGTH (ptr) +
(sizeof (SCM_STACKITEM) + -1 +
sizeof (scm_contregs)) /
sizeof (SCM_STACKITEM)));
break;
case scm_tc7_bvect:
case scm_tc7_byvect:
@ -1191,7 +1195,8 @@ scm_gc_sweep ()
if SCM_GC8MARKP (scmptr)
goto c8mrkcontinue;
m += SCM_LENGTH (scmptr) * sizeof (SCM_STACKITEM) + sizeof (scm_contregs);
goto freechars;
if (SCM_VELTS (scmptr))
goto freechars;
case scm_tc7_ssymbol:
if SCM_GC8MARKP(scmptr)
goto c8mrkcontinue;
@ -1374,7 +1379,7 @@ scm_gc_sweep ()
/* {Front end to malloc}
*
* scm_must_malloc, scm_must_realloc, scm_must_free
* scm_must_malloc, scm_must_realloc, scm_must_free, scm_done_malloc
*
* These functions provide services comperable to malloc, realloc, and
* free. They are for allocating malloced parts of scheme objects.
@ -1482,10 +1487,37 @@ scm_must_free (obj)
else
scm_wta (SCM_INUM0, "already free", "");
}
/* Announce that there has been some malloc done that will be freed
* during gc. A typical use is for a smob that uses some malloced
* memory but can not get it from scm_must_malloc (for whatever
* reason). When a new object of this smob is created you call
* scm_done_malloc with the size of the object. When your smob free
* function is called, be sure to include this size in the return
* value. */
void
scm_done_malloc (size)
long size;
{
scm_mallocated += size;
if (scm_mallocated > scm_mtrigger)
{
scm_igc ("foreign mallocs");
if (scm_mallocated > scm_mtrigger - SCM_MTRIGGER_HYSTERESIS)
{
if (scm_mallocated > scm_mtrigger)
scm_mtrigger = scm_mallocated + scm_mallocated / 2;
else
scm_mtrigger += scm_mtrigger / 2;
}
}
}
/* {Heap Segments}
*
* Each heap segment is an array of objects of a particular size.
@ -1493,8 +1525,7 @@ scm_must_free (obj)
* A table of segment records is kept that records the upper and
* lower extents of the segment; this is used during the conservative
* phase of gc to identify probably gc roots (because they point
* into valid segments at reasonable offsets).
*/
* into valid segments at reasonable offsets). */
/* scm_expmem
* is true if the first segment was smaller than INIT_HEAP_SEG.