150 lines
4.0 KiB
C
150 lines
4.0 KiB
C
/*
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* $Id: object.c,v 1.13 2005-05-15 18:37:00 bacon Exp $
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*/
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#include <xp/stx/object.h>
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#include <xp/stx/memory.h>
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#include <xp/stx/hash.h>
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#include <xp/stx/misc.h>
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#include <xp/bas/assert.h>
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#include <xp/bas/stdarg.h>
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/* n: number of instance variables */
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xp_stx_word_t xp_stx_alloc_object (xp_stx_t* stx, xp_stx_word_t n)
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{
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xp_stx_word_t idx;
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/* bytes to allocidxed =
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* number of instance variables * word_size
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*/
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idx = xp_stx_memory_alloc (&stx->memory,
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n * xp_sizeof(xp_stx_word_t) + xp_sizeof(xp_stx_object_t));
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if (idx >= stx->memory.capacity) return idx; /* failed */
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xp_assert (stx->nil == XP_STX_NIL);
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XP_STX_CLASS(stx,idx) = stx->nil;
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XP_STX_ACCESS(stx,idx) = (n << 2) | XP_STX_INDEXED;
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while (n--) XP_STX_AT(stx,idx,n) = stx->nil;
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return idx;
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}
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/* n: number of bytes */
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xp_stx_word_t xp_stx_alloc_byte_object (xp_stx_t* stx, xp_stx_word_t n)
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{
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xp_stx_word_t idx;
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idx = xp_stx_memory_alloc (
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&stx->memory, n + xp_sizeof(xp_stx_object_t));
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if (idx >= stx->memory.capacity) return idx; /* failed */
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xp_assert (stx->nil == XP_STX_NIL);
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XP_STX_CLASS(stx,idx) = stx->nil;
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XP_STX_ACCESS(stx,idx) = (n << 2) | XP_STX_BYTE_INDEXED;
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while (n--) XP_STX_BYTEAT(stx,idx,n) = 0;
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return idx;
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}
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xp_stx_word_t xp_stx_alloc_string_object (
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xp_stx_t* stx, const xp_stx_char_t* str)
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{
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xp_stx_word_t idx, n;
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n = xp_stx_strlen(str);
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idx = xp_stx_memory_alloc (&stx->memory,
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(n + 1) * xp_sizeof(xp_stx_char_t) + xp_sizeof(xp_stx_object_t));
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if (idx >= stx->memory.capacity) return idx; /* failed */
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xp_assert (stx->nil == XP_STX_NIL);
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XP_STX_CLASS(stx,idx) = stx->nil;
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XP_STX_ACCESS(stx,idx) = (n << 2) | XP_STX_CHAR_INDEXED;
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XP_STX_CHARAT(stx,idx,n) = XP_STX_CHAR('\0');
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while (n--) XP_STX_CHARAT(stx,idx,n) = str[n];
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return idx;
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}
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xp_stx_word_t xp_stx_allocn_string_object (xp_stx_t* stx, ...)
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{
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xp_stx_word_t idx, n = 0;
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const xp_stx_char_t* p;
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xp_va_list ap;
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xp_va_start (ap, stx);
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while ((p = xp_va_arg(ap, const xp_stx_char_t*)) != XP_NULL) {
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n += xp_stx_strlen(p);
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}
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xp_va_end (ap);
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idx = xp_stx_memory_alloc (&stx->memory,
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(n + 1) * xp_sizeof(xp_stx_char_t) + xp_sizeof(xp_stx_object_t));
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if (idx >= stx->memory.capacity) return idx; /* failed */
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xp_assert (stx->nil == XP_STX_NIL);
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XP_STX_CLASS(stx,idx) = stx->nil;
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XP_STX_ACCESS(stx,idx) = (n << 2) | XP_STX_CHAR_INDEXED;
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XP_STX_CHARAT(stx,idx,n) = XP_STX_CHAR('\0');
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xp_va_start (ap, stx);
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n = 0;
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while ((p = xp_va_arg(ap, const xp_stx_char_t*)) != XP_NULL) {
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while (*p != XP_STX_CHAR('\0'))
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XP_STX_CHARAT(stx,idx,n++) = *p++;
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}
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xp_va_end (ap);
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return idx;
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}
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xp_stx_word_t xp_stx_hash_string_object (xp_stx_t* stx, xp_stx_word_t idx)
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{
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xp_assert (XP_STX_TYPE(stx,idx) == XP_STX_CHAR_INDEXED);
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return xp_stx_strxhash (
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&XP_STX_CHARAT(stx,idx,0), XP_STX_SIZE(stx,idx));
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}
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xp_stx_word_t xp_stx_new_class (xp_stx_t* stx, const xp_stx_char_t* name)
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{
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xp_stx_word_t meta, class;
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xp_stx_word_t meta_name, class_name;
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meta = xp_stx_alloc_object (stx, XP_STX_CLASS_DIMENSION);
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XP_STX_CLASS(stx,meta) = stx->class_metaclass;
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XP_STX_AT(stx,meta,XP_STX_CLASS_SIZE) =
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XP_STX_TO_SMALLINT(XP_STX_CLASS_DIMENSION);
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class = xp_stx_alloc_object (stx, XP_STX_CLASS_DIMENSION);
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XP_STX_CLASS(stx,class) = meta;
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meta_name = xp_stx_new_symbol_pp (
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stx, name, XP_STX_TEXT(""), XP_STX_TEXT(" class"));
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XP_STX_AT(stx,meta,XP_STX_CLASS_NAME) = meta_name;
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class_name = xp_stx_new_symbol (stx, name);
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XP_STX_AT(stx,class,XP_STX_CLASS_NAME) = class_name;
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xp_stx_hash_insert (stx, stx->symbol_table,
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xp_stx_hash_string_object(stx, meta_name),
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meta_name, meta);
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xp_stx_hash_insert (stx, stx->symbol_table,
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xp_stx_hash_string_object(stx, class_name),
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class_name, class);
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return class;
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}
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int xp_stx_lookup_global (
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xp_stx_t* stx, xp_stx_word_t key, xp_stx_word_t* value)
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{
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xp_stx_word_t link;
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// TODO: maybe xp_stx_hash_object is required instead of
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// xp_stx_hash_string_object.
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link = xp_stx_hash_lookup (stx, stx->symbol_table,
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xp_stx_hash_string_object(stx,key), key);
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if (link == stx->nil) return -1;
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*value = XP_STX_AT(stx,link,2);
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return 0;
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}
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