867 lines
17 KiB
C
867 lines
17 KiB
C
/**
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* See Copyright Notice in picrin.h
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*/
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#include "picrin.h"
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#include "picrin/gc.h"
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#include "picrin/pair.h"
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#include "picrin/string.h"
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#include "picrin/vector.h"
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#include "picrin/irep.h"
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#include "picrin/proc.h"
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#include "picrin/port.h"
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#include "picrin/blob.h"
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#include "picrin/cont.h"
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#include "picrin/error.h"
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#include "picrin/macro.h"
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#include "picrin/lib.h"
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#include "picrin/data.h"
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#include "picrin/dict.h"
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#include "picrin/record.h"
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#include "picrin/read.h"
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#if GC_DEBUG
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# include <string.h>
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#endif
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union header {
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struct {
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union header *ptr;
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size_t size;
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unsigned int mark : 1;
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} s;
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long alignment[4];
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};
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struct heap_page {
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union header *basep, *endp;
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struct heap_page *next;
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};
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struct pic_heap {
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union header base, *freep;
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struct heap_page *pages;
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};
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static void
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heap_init(struct pic_heap *heap)
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{
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heap->base.s.ptr = &heap->base;
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heap->base.s.size = 0; /* not 1, since it must never be used for allocation */
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heap->base.s.mark = PIC_GC_UNMARK;
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heap->freep = &heap->base;
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heap->pages = NULL;
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#if GC_DEBUG
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printf("freep = %p\n", (void *)heap->freep);
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#endif
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}
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struct pic_heap *
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pic_heap_open()
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{
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struct pic_heap *heap;
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heap = (struct pic_heap *)calloc(1, sizeof(struct pic_heap));
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heap_init(heap);
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return heap;
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}
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void
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pic_heap_close(struct pic_heap *heap)
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{
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struct heap_page *page;
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while (heap->pages) {
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page = heap->pages;
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heap->pages = heap->pages->next;
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free(page);
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}
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}
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static void gc_free(pic_state *, union header *);
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static void
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add_heap_page(pic_state *pic)
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{
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union header *up, *np;
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struct heap_page *page;
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size_t nu;
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#if GC_DEBUG
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puts("adding heap page!");
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#endif
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nu = (PIC_HEAP_PAGE_SIZE + sizeof(union header) - 1) / sizeof(union header) + 1;
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up = (union header *)pic_calloc(pic, 1 + nu + 1, sizeof(union header));
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up->s.size = nu + 1;
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up->s.mark = PIC_GC_UNMARK;
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gc_free(pic, up);
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np = up + 1;
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np->s.size = nu;
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np->s.ptr = up->s.ptr;
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up->s.size = 1;
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up->s.ptr = np;
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page = (struct heap_page *)pic_alloc(pic, sizeof(struct heap_page));
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page->basep = up;
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page->endp = up + nu + 1;
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page->next = pic->heap->pages;
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pic->heap->pages = page;
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}
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static void *
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alloc(void *ptr, size_t size)
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{
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if (size == 0) {
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if (ptr) {
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free(ptr);
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}
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return NULL;
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}
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if (ptr) {
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return realloc(ptr, size);
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} else {
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return malloc(size);
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}
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}
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void *
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pic_alloc(pic_state *pic, size_t size)
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{
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void *ptr;
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ptr = alloc(NULL, size);
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if (ptr == NULL && size > 0) {
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pic_abort(pic, "memory exhausted");
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}
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return ptr;
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}
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void *
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pic_realloc(pic_state *pic, void *ptr, size_t size)
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{
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ptr = alloc(ptr, size);
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if (ptr == NULL && size > 0) {
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pic_abort(pic, "memory exhausted");
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}
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return ptr;
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}
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void *
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pic_calloc(pic_state *pic, size_t count, size_t size)
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{
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void *ptr;
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size *= count;
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ptr = alloc(NULL, size);
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if (ptr == NULL && size > 0) {
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pic_abort(pic, "memory exhausted");
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}
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memset(ptr, 0, size);
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return ptr;
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}
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void
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pic_free(pic_state *pic, void *ptr)
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{
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UNUSED(pic);
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free(ptr);
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}
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static void
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gc_protect(pic_state *pic, struct pic_object *obj)
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{
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if (pic->arena_idx >= pic->arena_size) {
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pic->arena_size = pic->arena_size * 2 + 1;
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pic->arena = pic_realloc(pic, pic->arena, sizeof(struct pic_object *) * pic->arena_size);
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}
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pic->arena[pic->arena_idx++] = obj;
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}
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pic_value
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pic_gc_protect(pic_state *pic, pic_value v)
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{
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struct pic_object *obj;
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if (pic_vtype(v) != PIC_VTYPE_HEAP) {
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return v;
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}
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obj = pic_obj_ptr(v);
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gc_protect(pic, obj);
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return v;
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}
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size_t
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pic_gc_arena_preserve(pic_state *pic)
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{
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return pic->arena_idx;
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}
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void
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pic_gc_arena_restore(pic_state *pic, size_t state)
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{
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pic->arena_idx = state;
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}
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static void *
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gc_alloc(pic_state *pic, size_t size)
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{
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union header *freep, *p, *prevp;
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size_t nunits;
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#if GC_DEBUG
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assert(size > 0);
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#endif
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nunits = (size + sizeof(union header) - 1) / sizeof(union header) + 1;
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prevp = freep = pic->heap->freep;
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for (p = prevp->s.ptr; ; prevp = p, p = p->s.ptr) {
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if (p->s.size >= nunits)
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break;
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if (p == freep) {
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return NULL;
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}
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}
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#if GC_DEBUG
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{
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unsigned char *c;
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size_t s, i, j;
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if (p->s.size == nunits) {
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c = (unsigned char *)(p + p->s.size - nunits + 1);
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s = nunits - 1;
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} else {
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c = (unsigned char *)(p + p->s.size - nunits);
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s = nunits;
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}
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for (i = 0; i < s; ++i) {
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for (j = 0; j < sizeof(union header); ++j) {
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assert(c[i * sizeof(union header) + j] == 0xAA);
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}
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}
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}
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#endif
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if (p->s.size == nunits) {
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prevp->s.ptr = p->s.ptr;
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}
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else {
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p->s.size -= nunits;
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p += p->s.size;
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p->s.size = nunits;
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}
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pic->heap->freep = prevp;
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p->s.mark = PIC_GC_UNMARK;
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#if GC_DEBUG
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memset(p+1, 0, sizeof(union header) * (nunits - 1));
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p->s.ptr = (union header *)0xcafebabe;
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#endif
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return (void *)(p + 1);
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}
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static void
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gc_free(pic_state *pic, union header *bp)
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{
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union header *freep, *p;
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#if GC_DEBUG
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assert(bp != NULL);
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assert(bp->s.size > 1);
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#endif
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#if GC_DEBUG
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memset(bp + 1, 0xAA, (bp->s.size - 1) * sizeof(union header));
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#endif
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freep = pic->heap->freep;
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for (p = freep; ! (bp > p && bp < p->s.ptr); p = p->s.ptr) {
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if (p >= p->s.ptr && (bp > p || bp < p->s.ptr)) {
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break;
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}
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}
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if (bp + bp->s.size == p->s.ptr) {
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bp->s.size += p->s.ptr->s.size;
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bp->s.ptr = p->s.ptr->s.ptr;
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#if GC_DEBUG
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memset(p->s.ptr, 0xAA, sizeof(union header));
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#endif
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}
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else {
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bp->s.ptr = p->s.ptr;
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}
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if (p + p->s.size == bp && p->s.size > 1) {
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p->s.size += bp->s.size;
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p->s.ptr = bp->s.ptr;
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#if GC_DEBUG
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memset(bp, 0xAA, sizeof(union header));
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#endif
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}
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else {
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p->s.ptr = bp;
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}
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pic->heap->freep = p;
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}
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static void gc_mark(pic_state *, pic_value);
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static void gc_mark_object(pic_state *pic, struct pic_object *obj);
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static bool
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gc_is_marked(union header *p)
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{
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return p->s.mark == PIC_GC_MARK;
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}
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static void
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gc_unmark(union header *p)
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{
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p->s.mark = PIC_GC_UNMARK;
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}
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static void
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gc_mark_object(pic_state *pic, struct pic_object *obj)
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{
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union header *p;
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p = ((union header *)obj) - 1;
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if (gc_is_marked(p))
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return;
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p->s.mark = PIC_GC_MARK;
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switch (obj->tt) {
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case PIC_TT_PAIR: {
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gc_mark(pic, ((struct pic_pair *)obj)->car);
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gc_mark(pic, ((struct pic_pair *)obj)->cdr);
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break;
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}
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case PIC_TT_ENV: {
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struct pic_env *env = (struct pic_env *)obj;
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int i;
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for (i = 0; i < env->regc; ++i) {
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gc_mark(pic, env->regs[i]);
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}
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if (env->up) {
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gc_mark_object(pic, (struct pic_object *)env->up);
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}
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break;
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}
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case PIC_TT_PROC: {
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struct pic_proc *proc = (struct pic_proc *)obj;
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if (proc->env) {
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gc_mark_object(pic, (struct pic_object *)proc->env);
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}
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if (proc->attr) {
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gc_mark_object(pic, (struct pic_object *)proc->attr);
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}
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if (pic_proc_irep_p(proc)) {
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gc_mark_object(pic, (struct pic_object *)proc->u.irep);
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}
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break;
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}
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case PIC_TT_PORT: {
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break;
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}
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case PIC_TT_ERROR: {
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struct pic_error *err = (struct pic_error *)obj;
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gc_mark_object(pic,(struct pic_object *)err->msg);
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gc_mark(pic, err->irrs);
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gc_mark_object(pic, (struct pic_object *)err->stack);
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break;
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}
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case PIC_TT_STRING: {
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break;
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}
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case PIC_TT_VECTOR: {
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size_t i;
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for (i = 0; i < ((struct pic_vector *)obj)->len; ++i) {
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gc_mark(pic, ((struct pic_vector *)obj)->data[i]);
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}
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break;
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}
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case PIC_TT_BLOB: {
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break;
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}
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case PIC_TT_CONT: {
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struct pic_cont *cont = (struct pic_cont *)obj;
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pic_value *stack;
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pic_callinfo *ci;
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size_t i;
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/* block */
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gc_mark_object(pic, (struct pic_object *)cont->blk);
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/* stack */
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for (stack = cont->st_ptr; stack != cont->st_ptr + cont->sp_offset; ++stack) {
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gc_mark(pic, *stack);
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}
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/* callinfo */
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for (ci = cont->ci_ptr + cont->ci_offset; ci != cont->ci_ptr; --ci) {
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if (ci->env) {
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gc_mark_object(pic, (struct pic_object *)ci->env);
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}
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}
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/* arena */
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for (i = 0; i < (size_t)cont->arena_idx; ++i) {
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gc_mark_object(pic, cont->arena[i]);
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}
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/* error handlers */
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for (i = 0; i < cont->try_jmp_idx; ++i) {
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if (cont->try_jmps[i].handler) {
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gc_mark_object(pic, (struct pic_object *)cont->try_jmps[i].handler);
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}
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}
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/* result values */
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gc_mark(pic, cont->results);
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break;
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}
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case PIC_TT_MACRO: {
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struct pic_macro *mac = (struct pic_macro *)obj;
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if (mac->proc) {
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gc_mark_object(pic, (struct pic_object *)mac->proc);
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}
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if (mac->senv) {
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gc_mark_object(pic, (struct pic_object *)mac->senv);
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}
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break;
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}
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case PIC_TT_SENV: {
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struct pic_senv *senv = (struct pic_senv *)obj;
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if (senv->up) {
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gc_mark_object(pic, (struct pic_object *)senv->up);
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}
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gc_mark(pic, senv->defer);
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break;
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}
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case PIC_TT_LIB: {
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struct pic_lib *lib = (struct pic_lib *)obj;
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gc_mark(pic, lib->name);
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gc_mark_object(pic, (struct pic_object *)lib->env);
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break;
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}
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case PIC_TT_IREP: {
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struct pic_irep *irep = (struct pic_irep *)obj;
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size_t i;
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for (i = 0; i < irep->ilen; ++i) {
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gc_mark_object(pic, (struct pic_object *)irep->irep[i]);
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}
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for (i = 0; i < irep->plen; ++i) {
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gc_mark(pic, irep->pool[i]);
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}
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break;
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}
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case PIC_TT_DATA: {
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struct pic_data *data = (struct pic_data *)obj;
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xh_entry *it;
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for (it = xh_begin(&data->storage); it != NULL; it = xh_next(it)) {
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gc_mark(pic, xh_val(it, pic_value));
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}
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break;
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}
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case PIC_TT_DICT: {
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struct pic_dict *dict = (struct pic_dict *)obj;
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xh_entry *it;
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for (it = xh_begin(&dict->hash); it != NULL; it = xh_next(it)) {
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gc_mark(pic, xh_key(it, pic_value));
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gc_mark(pic, xh_val(it, pic_value));
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}
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break;
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}
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case PIC_TT_RECORD: {
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struct pic_record *rec = (struct pic_record *)obj;
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xh_entry *it;
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for (it = xh_begin(&rec->hash); it != NULL; it = xh_next(it)) {
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gc_mark(pic, xh_val(it, pic_value));
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}
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break;
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}
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case PIC_TT_BLK: {
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struct pic_block *blk = (struct pic_block *)obj;
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if (blk->prev) {
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gc_mark_object(pic, (struct pic_object *)blk->prev);
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}
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if (blk->in) {
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gc_mark_object(pic, (struct pic_object *)blk->in);
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}
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if (blk->out) {
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gc_mark_object(pic, (struct pic_object *)blk->out);
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}
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break;
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}
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case PIC_TT_NIL:
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case PIC_TT_BOOL:
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case PIC_TT_FLOAT:
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case PIC_TT_INT:
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case PIC_TT_SYMBOL:
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case PIC_TT_CHAR:
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case PIC_TT_EOF:
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case PIC_TT_UNDEF:
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pic_abort(pic, "logic flaw");
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}
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}
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static void
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gc_mark(pic_state *pic, pic_value v)
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{
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struct pic_object *obj;
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if (pic_vtype(v) != PIC_VTYPE_HEAP)
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return;
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obj = pic_obj_ptr(v);
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gc_mark_object(pic, obj);
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}
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static void
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gc_mark_trie(pic_state *pic, struct pic_trie *trie)
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{
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size_t i;
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for (i = 0; i < sizeof trie->table / sizeof(struct pic_trie *); ++i) {
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if (trie->table[i] != NULL) {
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gc_mark_trie(pic, trie->table[i]);
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}
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}
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if (trie->proc != NULL) {
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gc_mark_object(pic, (struct pic_object *)trie->proc);
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}
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}
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|
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static void
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gc_mark_phase(pic_state *pic)
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{
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pic_value *stack;
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pic_callinfo *ci;
|
|
size_t i, j;
|
|
xh_entry *it;
|
|
|
|
/* block */
|
|
if (pic->blk) {
|
|
gc_mark_object(pic, (struct pic_object *)pic->blk);
|
|
}
|
|
|
|
/* stack */
|
|
for (stack = pic->stbase; stack != pic->sp; ++stack) {
|
|
gc_mark(pic, *stack);
|
|
}
|
|
|
|
/* callinfo */
|
|
for (ci = pic->ci; ci != pic->cibase; --ci) {
|
|
if (ci->env) {
|
|
gc_mark_object(pic, (struct pic_object *)ci->env);
|
|
}
|
|
}
|
|
|
|
/* error object */
|
|
gc_mark(pic, pic->err);
|
|
|
|
/* arena */
|
|
for (j = 0; j < pic->arena_idx; ++j) {
|
|
gc_mark_object(pic, pic->arena[j]);
|
|
}
|
|
|
|
/* global variables */
|
|
for (it = xh_begin(&pic->globals); it != NULL; it = xh_next(it)) {
|
|
gc_mark(pic, xh_val(it, pic_value));
|
|
}
|
|
|
|
/* macro objects */
|
|
for (it = xh_begin(&pic->macros); it != NULL; it = xh_next(it)) {
|
|
gc_mark_object(pic, xh_val(it, struct pic_object *));
|
|
}
|
|
|
|
/* error handlers */
|
|
for (i = 0; i < pic->try_jmp_idx; ++i) {
|
|
if (pic->try_jmps[i].handler) {
|
|
gc_mark_object(pic, (struct pic_object *)pic->try_jmps[i].handler);
|
|
}
|
|
}
|
|
|
|
gc_mark(pic, pic->features);
|
|
|
|
/* readers */
|
|
gc_mark_trie(pic, pic->reader->trie);
|
|
|
|
/* library table */
|
|
gc_mark(pic, pic->libs);
|
|
|
|
/* standard I/O ports */
|
|
if (pic->xSTDIN) {
|
|
gc_mark_object(pic, (struct pic_object *)pic->xSTDIN);
|
|
}
|
|
if (pic->xSTDOUT) {
|
|
gc_mark_object(pic, (struct pic_object *)pic->xSTDOUT);
|
|
}
|
|
if (pic->xSTDERR) {
|
|
gc_mark_object(pic, (struct pic_object *)pic->xSTDERR);
|
|
}
|
|
}
|
|
|
|
static void
|
|
gc_finalize_object(pic_state *pic, struct pic_object *obj)
|
|
{
|
|
#if GC_DEBUG
|
|
printf("* finalizing object: %s", pic_type_repr(pic_type(pic_obj_value(obj))));
|
|
// pic_debug(pic, pic_obj_value(obj));
|
|
puts("");
|
|
#endif
|
|
|
|
switch (obj->tt) {
|
|
case PIC_TT_PAIR: {
|
|
break;
|
|
}
|
|
case PIC_TT_ENV: {
|
|
break;
|
|
}
|
|
case PIC_TT_PROC: {
|
|
break;
|
|
}
|
|
case PIC_TT_VECTOR: {
|
|
pic_free(pic, ((struct pic_vector *)obj)->data);
|
|
break;
|
|
}
|
|
case PIC_TT_BLOB: {
|
|
pic_free(pic, ((struct pic_blob *)obj)->data);
|
|
break;
|
|
}
|
|
case PIC_TT_STRING: {
|
|
XROPE_DECREF(((struct pic_string *)obj)->rope);
|
|
break;
|
|
}
|
|
case PIC_TT_PORT: {
|
|
break;
|
|
}
|
|
case PIC_TT_ERROR: {
|
|
break;
|
|
}
|
|
case PIC_TT_CONT: {
|
|
struct pic_cont *cont = (struct pic_cont *)obj;
|
|
pic_free(pic, cont->stk_ptr);
|
|
pic_free(pic, cont->st_ptr);
|
|
pic_free(pic, cont->ci_ptr);
|
|
pic_free(pic, cont->arena);
|
|
pic_free(pic, cont->try_jmps);
|
|
break;
|
|
}
|
|
case PIC_TT_SENV: {
|
|
struct pic_senv *senv = (struct pic_senv *)obj;
|
|
xh_destroy(&senv->map);
|
|
break;
|
|
}
|
|
case PIC_TT_MACRO: {
|
|
break;
|
|
}
|
|
case PIC_TT_LIB: {
|
|
struct pic_lib *lib = (struct pic_lib *)obj;
|
|
xh_destroy(&lib->exports);
|
|
break;
|
|
}
|
|
case PIC_TT_IREP: {
|
|
struct pic_irep *irep = (struct pic_irep *)obj;
|
|
pic_free(pic, irep->code);
|
|
pic_free(pic, irep->irep);
|
|
pic_free(pic, irep->pool);
|
|
break;
|
|
}
|
|
case PIC_TT_DATA: {
|
|
struct pic_data *data = (struct pic_data *)obj;
|
|
data->type->dtor(pic, data->data);
|
|
xh_destroy(&data->storage);
|
|
break;
|
|
}
|
|
case PIC_TT_DICT: {
|
|
struct pic_dict *dict = (struct pic_dict *)obj;
|
|
xh_destroy(&dict->hash);
|
|
break;
|
|
}
|
|
case PIC_TT_RECORD: {
|
|
struct pic_record *rec = (struct pic_record *)obj;
|
|
xh_destroy(&rec->hash);
|
|
break;
|
|
}
|
|
case PIC_TT_BLK: {
|
|
break;
|
|
}
|
|
case PIC_TT_NIL:
|
|
case PIC_TT_BOOL:
|
|
case PIC_TT_FLOAT:
|
|
case PIC_TT_INT:
|
|
case PIC_TT_SYMBOL:
|
|
case PIC_TT_CHAR:
|
|
case PIC_TT_EOF:
|
|
case PIC_TT_UNDEF:
|
|
pic_abort(pic, "logic flaw");
|
|
}
|
|
}
|
|
|
|
static void
|
|
gc_sweep_page(pic_state *pic, struct heap_page *page)
|
|
{
|
|
#if GC_DEBUG
|
|
static union header *NIL = (union header *)0xdeadbeef;
|
|
#else
|
|
static union header *NIL = NULL;
|
|
#endif
|
|
union header *bp, *p, *s = NIL, *t;
|
|
|
|
#if GC_DEBUG
|
|
int c = 0;
|
|
#endif
|
|
|
|
for (bp = page->basep; ; bp = bp->s.ptr) {
|
|
for (p = bp + bp->s.size; p != bp->s.ptr; p += p->s.size) {
|
|
if (p == page->endp) {
|
|
goto escape;
|
|
}
|
|
if (! gc_is_marked(p)) {
|
|
if (s == NIL) {
|
|
s = p;
|
|
}
|
|
else {
|
|
t->s.ptr = p;
|
|
}
|
|
t = p;
|
|
t->s.ptr = NIL; /* For dead objects we can safely reuse ptr field */
|
|
}
|
|
gc_unmark(p);
|
|
}
|
|
}
|
|
escape:
|
|
|
|
/* free! */
|
|
while (s != NIL) {
|
|
t = s->s.ptr;
|
|
gc_finalize_object(pic, (struct pic_object *)(s + 1));
|
|
gc_free(pic, s);
|
|
s = t;
|
|
|
|
#if GC_DEBUG
|
|
c++;
|
|
#endif
|
|
}
|
|
|
|
#if GC_DEBUG
|
|
printf("freed objects count: %d\n", c);
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
gc_sweep_phase(pic_state *pic)
|
|
{
|
|
struct heap_page *page = pic->heap->pages;
|
|
|
|
while (page) {
|
|
gc_sweep_page(pic, page);
|
|
page = page->next;
|
|
}
|
|
}
|
|
|
|
void
|
|
pic_gc_run(pic_state *pic)
|
|
{
|
|
#if GC_DEBUG
|
|
struct heap_page *page;
|
|
#endif
|
|
|
|
#if DEBUG
|
|
puts("gc run!");
|
|
#endif
|
|
|
|
gc_mark_phase(pic);
|
|
gc_sweep_phase(pic);
|
|
|
|
#if GC_DEBUG
|
|
for (page = pic->heap->pages; page; page = page->next) {
|
|
union header *bp, *p;
|
|
unsigned char *c;
|
|
|
|
for (bp = page->basep; ; bp = bp->s.ptr) {
|
|
for (c = (unsigned char *)(bp+1); c != (unsigned char *)(bp + bp->s.size); ++c) {
|
|
assert(*c == 0xAA);
|
|
}
|
|
for (p = bp + bp->s.size; p != bp->s.ptr; p += p->s.size) {
|
|
if (p == page->endp) {
|
|
/* if (page->next) */
|
|
/* assert(bp->s.ptr == page->next->basep); */
|
|
/* else */
|
|
/* assert(bp->s.ptr == &pic->heap->base); */
|
|
goto escape;
|
|
}
|
|
assert(! gc_is_marked(p));
|
|
}
|
|
}
|
|
escape:
|
|
((void)0);
|
|
}
|
|
|
|
puts("not error on heap found! gc successfully finished");
|
|
#endif
|
|
}
|
|
|
|
struct pic_object *
|
|
pic_obj_alloc_unsafe(pic_state *pic, size_t size, enum pic_tt tt)
|
|
{
|
|
struct pic_object *obj;
|
|
|
|
#if GC_DEBUG
|
|
printf("*allocating: %s\n", pic_type_repr(tt));
|
|
#endif
|
|
|
|
#if GC_STRESS
|
|
pic_gc_run(pic);
|
|
#endif
|
|
|
|
obj = (struct pic_object *)gc_alloc(pic, size);
|
|
if (obj == NULL) {
|
|
pic_gc_run(pic);
|
|
obj = (struct pic_object *)gc_alloc(pic, size);
|
|
if (obj == NULL) {
|
|
add_heap_page(pic);
|
|
obj = (struct pic_object *)gc_alloc(pic, size);
|
|
if (obj == NULL)
|
|
pic_abort(pic, "GC memory exhausted");
|
|
}
|
|
}
|
|
obj->tt = tt;
|
|
|
|
return obj;
|
|
}
|
|
|
|
struct pic_object *
|
|
pic_obj_alloc(pic_state *pic, size_t size, enum pic_tt tt)
|
|
{
|
|
struct pic_object *obj;
|
|
|
|
obj = pic_obj_alloc_unsafe(pic, size, tt);
|
|
|
|
gc_protect(pic, obj);
|
|
return obj;
|
|
}
|