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pluggable heap pages

This commit is contained in:
Yuichi Nishiwaki 2013-11-22 07:12:03 -08:00
parent 663081921d
commit e6523730a4
2 changed files with 31 additions and 16 deletions
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2
include/config.h
View File

@ -12,7 +12,7 @@
/* initial memory size (to be dynamically extended if necessary) */
#define PIC_ARENA_SIZE 100
#define PIC_HEAP_SIZE (20000 * 8)
#define PIC_HEAP_PAGE_SIZE (8192 * 8)
#define PIC_STACK_SIZE 1024
#define PIC_RESCUE_SIZE 30
#define PIC_IREP_SIZE 256

45
src/gc.c
View File

@ -16,28 +16,42 @@
void
init_heap_page(struct heap_page *heap)
{
int nu;
nu = (PIC_HEAP_SIZE + sizeof(union header) - 1) / sizeof(union header) + 1;
heap->base.s.ptr = (union header *)calloc(nu, sizeof(union header));
heap->base.s.ptr = heap->freep = &heap->base;
heap->base.s.size = 0; /* not 1, since it must never be fused into other headers */
heap->base.s.mark = PIC_GC_UNMARK;
heap->freep = heap->base.s.ptr;
heap->freep->s.size = nu - 1;
heap->freep->s.ptr = heap->freep + heap->freep->s.size;
heap->freep->s.mark = PIC_GC_UNMARK;
heap->freep->s.ptr->s.size = 0;
heap->freep->s.ptr->s.ptr = &heap->base;
heap->freep->s.ptr->s.mark = PIC_GC_UNMARK;
#if GC_DEBUG
printf("freep = %p\n", heap->freep);
#endif
}
static void gc_free(pic_state *, union header *);
static void *
add_heap_page(pic_state *pic)
{
int nu;
union header *p, *ep;
#if DEBUG
puts("heap page added");
#endif
nu = (PIC_HEAP_PAGE_SIZE + sizeof(union header) - 1) / sizeof(union header) + 1;
p = (union header *)calloc(nu, sizeof(union header));
p->s.size = nu - 1;
p->s.mark = PIC_GC_UNMARK;
gc_free(pic, p);
ep = p + p->s.size; /* end of page */
ep->s.size = 0;
ep->s.mark = PIC_GC_UNMARK;
ep->s.ptr = p->s.ptr;
p->s.ptr = ep;
return pic->heap->freep;
}
void *
pic_alloc(pic_state *pic, size_t size)
{
@ -125,7 +139,8 @@ gc_alloc(pic_state *pic, size_t size)
if (p->s.size >= nunits)
break;
if (p == freep) {
return 0;
if ((p = add_heap_page(pic)) == NULL)
return NULL;
}
}
if (p->s.size == nunits) {