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fixing SEXP_USE_CONSERVATIVE_GC, should be appropriate for general use

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Alex Shinn 2010-09-05 20:24:37 +09:00
parent 6c38c5d858
commit d38c6bc3e1
1 changed files with 27 additions and 2 deletions
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29
gc.c
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@ -85,6 +85,7 @@ void sexp_mark (sexp ctx, sexp x) {
}
#if SEXP_USE_CONSERVATIVE_GC
int stack_references_pointer_p (sexp ctx, sexp x) {
sexp *p;
for (p=(&x)+1; p<stack_base; p++)
@ -92,8 +93,31 @@ int stack_references_pointer_p (sexp ctx, sexp x) {
return 1;
return 0;
}
void sexp_conservative_mark (sexp ctx) {
sexp_heap h = sexp_context_heap(ctx);
sexp p, end;
sexp_free_list q, r;
for ( ; h; h=h->next) { /* just scan the whole heap */
p = (sexp) (h->data + sexp_heap_align(sexp_sizeof(pair)));
q = h->free_list;
end = (sexp) ((char*)h->data + h->size - sexp_heap_align(sexp_sizeof(pair)));
while (p < end) {
for (r=q->next; r && ((char*)r<(char*)p); q=r, r=r->next)
;
if ((char*)r == (char*)p) {
p = (sexp) (((char*)p) + r->size);
continue;
}
if (! sexp_gc_mark(p) && stack_references_pointer_p(ctx, p))
sexp_mark(ctx, p);
p = (sexp) (((char*)p)+sexp_heap_align(sexp_allocated_bytes(ctx, p)));
}
}
}
#else
#define stack_references_pointer_p(ctx, x) 0
#define sexp_conservative_mark(ctx)
#endif
#if SEXP_USE_WEAK_REFERENCES
@ -160,7 +184,7 @@ sexp sexp_sweep (sexp ctx, size_t *sum_freed_ptr) {
continue;
}
size = sexp_heap_align(sexp_allocated_bytes(ctx, p));
if ((! sexp_gc_mark(p)) && (! stack_references_pointer_p(ctx, p))) {
if (! sexp_gc_mark(p)) {
/* free p */
finalizer = sexp_type_finalize(sexp_object_type(ctx, p));
if (finalizer) finalizer(ctx sexp_api_pass(NULL, 1), p);
@ -213,6 +237,7 @@ sexp sexp_gc (sexp ctx, size_t *sum_freed) {
sexp_mark(ctx, sexp_symbol_table[i]);
#endif
sexp_mark(ctx, ctx);
sexp_conservative_mark(ctx);
#if SEXP_USE_DEBUG_GC
sexp_sweep_stats(ctx, 2, NULL, "* \x1B[31mFREE:\x1B[0m ");
#endif