104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
/*
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* $Id: memory.c,v 1.7 2005-05-08 11:16:07 bacon Exp $
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*/
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#include <xp/stx/memory.h>
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#include <xp/bas/memory.h>
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#include <xp/bas/assert.h>
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xp_stx_memory_t* xp_stx_memory_open (
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xp_stx_memory_t* mem, xp_stx_word_t capacity)
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{
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xp_stx_object_t** slots;
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xp_stx_word_t n;
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xp_assert (capacity > 0);
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if (mem == XP_NULL) {
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mem = (xp_stx_memory_t*)xp_malloc(xp_sizeof(xp_stx_memory_t));
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if (mem == XP_NULL) return XP_NULL;
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mem->__malloced = xp_true;
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}
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else mem->__malloced = xp_false;
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slots = (xp_stx_object_t**)xp_malloc (
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capacity * xp_sizeof(xp_stx_object_t*));
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if (slots == XP_NULL) {
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if (mem->__malloced) xp_free (mem);
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mem = XP_NULL;
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}
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mem->capacity = capacity;
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mem->slots = slots;
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/* weave the free slot list */
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/*
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mem->free = &slots[capacity - 1];
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while (capacity > 1) {
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capacity--;
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mem->slots[capacity] = (xp_stx_object_t*)&mem->slots[capacity - 1];
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}
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mem->slots[--capacity] = XP_NULL;
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*/
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mem->free = &slots[0];
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for (n = 0; n < capacity - 1; n++) {
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mem->slots[n] = (xp_stx_object_t*)&mem->slots[n + 1];
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}
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mem->slots[n + 1] = XP_NULL;
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return mem;
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}
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void xp_stx_memory_close (xp_stx_memory_t* mem)
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{
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/* TODO: free all linked objects... */
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xp_free (mem->slots);
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mem->capacity = 0;
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mem->slots = XP_NULL;
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mem->free = XP_NULL;
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if (mem->__malloced) xp_free (mem);
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}
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void xp_stx_memory_gc (xp_stx_memory_t* mem)
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{
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/* TODO: implement this function */
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}
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xp_stx_word_t xp_stx_memory_alloc (xp_stx_memory_t* mem, xp_stx_word_t nbytes)
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{
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xp_stx_object_t** slot;
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xp_stx_object_t* object;
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/* find the free object slot */
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if (mem->free == XP_NULL) {
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xp_stx_memory_gc (mem);
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if (mem->free == XP_NULL) return mem->capacity;;
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}
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object = (xp_stx_object_t*)xp_malloc (nbytes);
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if (object == XP_NULL) {
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xp_stx_memory_gc (mem);
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object = (xp_stx_object_t*)xp_malloc (nbytes);
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if (object == XP_NULL) return mem->capacity;
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}
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slot = mem->free;
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mem->free = (xp_stx_object_t**)*slot;
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*slot = object;
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return (xp_stx_word_t)(slot - mem->slots);
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}
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void xp_stx_memory_dealloc (xp_stx_memory_t* mem, xp_stx_word_t object_index)
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{
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/*
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* THIS IS PRIMITIVE LOW-LEVEL DEALLOC. THIS WILL NOT
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* DEALLOCATE MEMORY ALLOCATED FOR ITS INSTANCE VARIABLES.
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*/
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xp_free (mem->slots[object_index]);
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mem->slots[object_index] = (xp_stx_object_t*)mem->free;
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mem->free = &mem->slots[object_index];
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}
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