117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/*
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* $Id: class.c,v 1.21 2005-07-07 07:45:05 bacon Exp $
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*/
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#include <xp/stx/class.h>
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#include <xp/stx/symbol.h>
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#include <xp/stx/object.h>
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#include <xp/stx/hash.h>
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#include <xp/stx/misc.h>
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xp_word_t xp_stx_new_class (xp_stx_t* stx, const xp_char_t* name)
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{
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xp_word_t meta, class;
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xp_word_t class_name;
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meta = xp_stx_alloc_word_object (
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stx, XP_NULL, XP_STX_METACLASS_SIZE, XP_NULL, 0);
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XP_STX_CLASS(stx,meta) = stx->class_metaclass;
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/* the spec of the metaclass must be the spec of its
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* instance. so the XP_STX_CLASS_SIZE is set */
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XP_STX_WORDAT(stx,meta,XP_STX_METACLASS_SPEC) =
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XP_STX_TO_SMALLINT((XP_STX_CLASS_SIZE << XP_STX_SPEC_INDEXABLE_BITS) | XP_STX_SPEC_NOT_INDEXABLE);
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/* the spec of the class is set later in __create_builtin_classes */
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class = xp_stx_alloc_word_object (
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stx, XP_NULL, XP_STX_CLASS_SIZE, XP_NULL, 0);
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XP_STX_CLASS(stx,class) = meta;
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class_name = xp_stx_new_symbol (stx, name);
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XP_STX_WORDAT(stx,class,XP_STX_CLASS_NAME) = class_name;
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xp_stx_hash_insert (stx, stx->smalltalk,
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xp_stx_hash_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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xp_word_t xp_stx_lookup_class (xp_stx_t* stx, const xp_char_t* name)
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{
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xp_word_t link, meta, value;
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link = xp_stx_hash_lookup_symbol (stx, stx->smalltalk, name);
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if (link == stx->nil) return stx->nil;
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value = XP_STX_WORDAT(stx,link,XP_STX_PAIRLINK_VALUE);
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meta = XP_STX_CLASS(stx,value);
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if (XP_STX_CLASS(stx,meta) != stx->class_metaclass) return stx->nil;
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return value;
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}
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int xp_stx_get_instance_variable_index (
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xp_stx_t* stx, xp_word_t class_index,
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const xp_char_t* name, xp_word_t* index)
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{
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xp_word_t index_super = 0;
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xp_stx_class_t* class_obj;
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xp_stx_char_object_t* string;
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class_obj = (xp_stx_class_t*)XP_STX_OBJECT(stx, class_index);
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xp_assert (class_obj != XP_NULL);
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if (class_obj->superclass != stx->nil) {
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if (xp_stx_get_instance_variable_index (
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stx, class_obj->superclass, name, &index_super) == 0) {
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*index = index_super;
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return 0;
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}
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}
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if (class_obj->header.class == stx->class_metaclass) {
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/* metaclass */
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/* TODO: can a metaclas have instance variables? */
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*index = index_super;
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}
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else {
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if (class_obj->variables == stx->nil) *index = 0;
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else {
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string = XP_STX_CHAR_OBJECT(stx, class_obj->variables);
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if (xp_stx_strword(string->data, name, index) != XP_NULL) {
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*index += index_super;
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return 0;
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}
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}
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*index += index_super;
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}
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return -1;
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}
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xp_word_t xp_stx_lookup_class_variable (
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xp_stx_t* stx, xp_word_t class_index, const xp_char_t* name)
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{
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xp_stx_class_t* class_obj;
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class_obj = (xp_stx_class_t*)XP_STX_OBJECT(stx, class_index);
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xp_assert (class_obj != XP_NULL);
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if (class_obj->superclass != stx->nil) {
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xp_word_t tmp;
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tmp = xp_stx_lookup_class_variable (
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stx, class_obj->superclass, name);
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if (tmp != stx->nil) return tmp;
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}
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/* TODO: can a metaclas have class variables? */
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if (class_obj->header.class != stx->class_metaclass &&
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class_obj->class_variables != stx->nil) {
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if (xp_stx_hash_lookup_symbol(stx,
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class_obj->class_variables, name) != stx->nil) return class_index;
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}
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return stx->nil;
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}
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