60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/*
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* $Id: object.c,v 1.3 2005-05-08 10:31:24 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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/* n: number of instance variables */
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xp_stx_word_t xp_stx_alloc_object (xp_stx_t* stx, xp_size_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_STX_OBJECT_CLASS(&stx->memory,idx) = stx->nil;
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XP_STX_OBJECT_ACCESS(&stx->memory,idx) = ((n << 2) | 0x00);
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while (n--) XP_STX_OBJECT_AT(&stx->memory,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_size_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_STX_OBJECT_CLASS(&stx->memory,idx) = stx->nil;
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XP_STX_OBJECT_ACCESS(&stx->memory,idx) = ((n << 2) | 0x01);
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while (n--) XP_STX_OBJECT_BYTEAT(&stx->memory,idx,n) = 0;
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return idx;
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}
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/* n: length of the string */
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xp_stx_word_t xp_stx_alloc_string_object (
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xp_stx_t* stx, xp_stx_char_t* str, 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 (&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_STX_OBJECT_CLASS(&stx->memory,idx) = stx->nil;
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XP_STX_OBJECT_ACCESS(&stx->memory,idx) = ((n << 2) | 0x02);
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XP_STX_OBJECT_CHARAT(&stx->memory,idx,n) = XP_STX_CHAR('\0');
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while (n--) XP_STX_OBJECT_CHARAT(&stx->memory,idx,n) = str[n];
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return idx;
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}
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