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remove page->index

This commit is contained in:
Yuichi Nishiwaki 2016-06-20 00:42:43 +09:00
parent 026150a712
commit af6a53a5b4
1 changed files with 11 additions and 20 deletions
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31
extlib/benz/gc/bitmap.c
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@ -11,10 +11,9 @@
struct heap_page {
struct heap_page *next;
size_t current;
size_t freep;
uint32_t bitmap[BITMAP_SIZE];
uint32_t shadow[BITMAP_SIZE];
uint32_t index[BITMAP_SIZE / UNIT_SIZE];
union header basep[1];
};
@ -93,16 +92,12 @@ heap_alloc(pic_state *pic, size_t size)
size_t index;
union header *h;
for (index = page->current; index < PAGE_UNITS - nunits; ++index) {
if (index % UNIT_SIZE == 0 && is_marked_at(page->index, index / UNIT_SIZE, 1)) {
index += UNIT_SIZE;
}
for (index = page->freep; index < PAGE_UNITS - nunits; ++index) {
if (! is_marked_at(page->bitmap, index, nunits)) {
mark_at(page, index, nunits);
h = index2header(page, index);
h->s.size = nunits;
page->current = index + nunits;
page->freep = index + nunits;
return (void *)(h + 1);
}
}
@ -123,8 +118,7 @@ heap_morecore(pic_state *pic)
pic_panic(pic, "memory exhausted");
memset(page->bitmap, 0, sizeof(page->bitmap));
memset(page->index, 0, sizeof(page->index));
page->current = 0;
page->freep = 0;
page->next = pic->heap->pages;
@ -136,13 +130,12 @@ is_marked(pic_state *pic, struct object *obj)
{
union header *h = ((union header *)obj) - 1;
struct heap_page *page;
size_t i;
size_t index;
page = obj2page(pic, h);
index = h - page->basep;
i = h - page->basep;
return is_marked_at(page->bitmap, i, h->s.size);
return is_marked_at(page->bitmap, index, h->s.size);
}
static void
@ -150,13 +143,12 @@ mark(pic_state *pic, struct object *obj)
{
union header *h = ((union header *)obj) - 1;
struct heap_page *page;
size_t i;
size_t index;
page = obj2page(pic, h);
index = h - page->basep;
i = h - page->basep;
mark_at(page, i, h->s.size);
mark_at(page, index, h->s.size);
}
static size_t
@ -190,8 +182,7 @@ gc_init(pic_state *pic)
/* clear mark bits */
memcpy(page->shadow, page->bitmap, sizeof(page->bitmap));
memset(page->bitmap, 0, sizeof(page->bitmap));
memset(page->index, 0, sizeof(page->index));
page->current = 0;
page->freep = 0;
page = page->next;
}
}