#include "libguile/smob.h"
+#include "libguile/boehm-gc.h"
+#include <gc/gc_mark.h>
+
+
\f
/* scm_smobs scm_numsmob
SCM
scm_make_smob (scm_t_bits tc)
{
- long n = SCM_TC2SMOBNUM (tc);
+ scm_t_bits n = SCM_TC2SMOBNUM (tc);
size_t size = scm_smobs[n].size;
scm_t_bits data = (size > 0
? (scm_t_bits) scm_gc_malloc (size, SCM_SMOBNAME (n))
: 0);
- return scm_cell (tc, data);
+
+ SCM_RETURN_NEWSMOB (tc, data);
}
\f
return 1;
}
+\f
+/* Marking SMOBs using user-supplied mark procedures. */
+
+
+/* The freelist and GC kind used for SMOB types that provide a custom mark
+ procedure. */
+static void **smob_freelist = NULL;
+static int smob_gc_kind = 0;
+
+
+/* The generic SMOB mark procedure that gets called for SMOBs allocated with
+ `scm_i_new_smob_with_mark_proc ()'. */
+static struct GC_ms_entry *
+smob_mark (GC_word *addr, struct GC_ms_entry *mark_stack_ptr,
+ struct GC_ms_entry *mark_stack_limit, GC_word env)
+{
+ register SCM cell;
+ register scm_t_bits tc, smobnum;
+
+ cell = PTR2SCM (addr);
+
+ if (SCM_TYP7 (cell) != scm_tc7_smob)
+ /* It is likely that the GC passed us a pointer to a free-list element
+ which we must ignore (see warning in `gc/gc_mark.h'). */
+ return mark_stack_ptr;
+
+ tc = SCM_CELL_WORD_0 (cell);
+ smobnum = SCM_TC2SMOBNUM (tc);
+
+ if (smobnum >= scm_numsmob)
+ /* The first word looks corrupt. */
+ abort ();
+
+ mark_stack_ptr = GC_MARK_AND_PUSH (SCM2PTR (SCM_CELL_OBJECT_1 (cell)),
+ mark_stack_ptr,
+ mark_stack_limit, NULL);
+ mark_stack_ptr = GC_MARK_AND_PUSH (SCM2PTR (SCM_CELL_OBJECT_2 (cell)),
+ mark_stack_ptr,
+ mark_stack_limit, NULL);
+ mark_stack_ptr = GC_MARK_AND_PUSH (SCM2PTR (SCM_CELL_OBJECT_3 (cell)),
+ mark_stack_ptr,
+ mark_stack_limit, NULL);
+
+ if (scm_smobs[smobnum].mark)
+ {
+ SCM obj;
+
+ SCM_I_CURRENT_THREAD->current_mark_stack_ptr = mark_stack_ptr;
+ SCM_I_CURRENT_THREAD->current_mark_stack_limit = mark_stack_limit;
+
+ /* Invoke the SMOB's mark procedure, which will in turn invoke
+ `scm_gc_mark ()', which may modify `current_mark_stack_ptr'. */
+ obj = scm_smobs[smobnum].mark (cell);
+
+ mark_stack_ptr = SCM_I_CURRENT_THREAD->current_mark_stack_ptr;
+
+ if (SCM_NIMP (obj))
+ /* Mark the returned object. */
+ mark_stack_ptr = GC_MARK_AND_PUSH (SCM2PTR (obj),
+ mark_stack_ptr,
+ mark_stack_limit, NULL);
+
+ SCM_I_CURRENT_THREAD->current_mark_stack_limit = NULL;
+ SCM_I_CURRENT_THREAD->current_mark_stack_ptr = NULL;
+ }
+
+ return mark_stack_ptr;
+
+}
+
+/* Mark object O. We assume that this function is only called during the
+ mark phase, i.e., from within `smob_mark ()' or one of its
+ descendents. */
+void
+scm_gc_mark (SCM o)
+{
+#define CURRENT_MARK_PTR \
+ ((struct GC_ms_entry *)(SCM_I_CURRENT_THREAD->current_mark_stack_ptr))
+#define CURRENT_MARK_LIMIT \
+ ((struct GC_ms_entry *)(SCM_I_CURRENT_THREAD->current_mark_stack_limit))
+
+ if (SCM_NIMP (o))
+ {
+ /* At this point, the `current_mark_*' fields of the current thread
+ must be defined (they are set in `smob_mark ()'). */
+ register struct GC_ms_entry *mark_stack_ptr;
+
+ if (!CURRENT_MARK_PTR)
+ /* The function was not called from a mark procedure. */
+ abort ();
+
+ mark_stack_ptr = GC_MARK_AND_PUSH (SCM2PTR (o),
+ CURRENT_MARK_PTR, CURRENT_MARK_LIMIT,
+ NULL);
+ SCM_I_CURRENT_THREAD->current_mark_stack_ptr = mark_stack_ptr;
+ }
+#undef CURRENT_MARK_PTR
+#undef CURRENT_MARK_LIMIT
+}
+
+/* Return a SMOB with typecode TC. The SMOB type corresponding to TC may
+ provide a custom mark procedure and it will be honored. */
+SCM
+scm_i_new_smob_with_mark_proc (scm_t_bits tc, scm_t_bits data1,
+ scm_t_bits data2, scm_t_bits data3)
+{
+ /* Return a double cell. */
+ SCM cell = SCM_PACK (GC_generic_malloc (2 * sizeof (scm_t_cell),
+ smob_gc_kind));
+
+ SCM_SET_CELL_WORD_3 (cell, data3);
+ SCM_SET_CELL_WORD_2 (cell, data2);
+ SCM_SET_CELL_WORD_1 (cell, data1);
+ SCM_SET_CELL_WORD_0 (cell, tc);
+
+ return cell;
+}
+
+\f
+/* Finalize SMOB by calling its SMOB type's free function, if any. */
+void
+scm_i_finalize_smob (GC_PTR ptr, GC_PTR data)
+{
+ SCM smob;
+ size_t (* free_smob) (SCM);
+
+ smob = PTR2SCM (ptr);
+#if 0
+ printf ("finalizing SMOB %p (smobnum: %u)\n",
+ ptr, SCM_SMOBNUM (smob));
+#endif
+
+ free_smob = scm_smobs[SCM_SMOBNUM (smob)].free;
+ if (free_smob)
+ free_smob (smob);
+}
+
+\f
void
scm_smob_prehistory ()
{
long i;
scm_t_bits tc;
+ smob_freelist = GC_new_free_list ();
+ smob_gc_kind = GC_new_kind ((void **)smob_freelist,
+ GC_MAKE_PROC (GC_new_proc (smob_mark), 0),
+ 0,
+ /* Clear new objects. As of version 7.1, libgc
+ doesn't seem to support passing 0 here. */
+ 1);
+
scm_numsmob = 0;
for (i = 0; i < MAX_SMOB_COUNT; ++i)
{
HCoop / bpt / guile.git / blobdiff