155 lines
3.6 KiB
C
155 lines
3.6 KiB
C
/*
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* $Id: stx.h,v 1.40 2005-08-11 09:57:54 bacon Exp $
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*/
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#ifndef _XP_STX_STX_H_
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#define _XP_STX_STX_H_
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#include <xp/types.h>
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#include <xp/macros.h>
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typedef struct xp_stx_objhdr_t xp_stx_objhdr_t;
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typedef struct xp_stx_object_t xp_stx_object_t;
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typedef struct xp_stx_word_object_t xp_stx_word_object_t;
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typedef struct xp_stx_byte_object_t xp_stx_byte_object_t;
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typedef struct xp_stx_char_object_t xp_stx_char_object_t;
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typedef struct xp_stx_memory_t xp_stx_memory_t;
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typedef struct xp_stx_t xp_stx_t;
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/* common object structure */
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struct xp_stx_objhdr_t
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{
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/* access - type: 2; size: rest;
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* type - word indexed: 00 byte indexed: 01 char indexed: 10
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*/
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xp_word_t access;
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xp_word_t class;
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};
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struct xp_stx_object_t
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{
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xp_stx_objhdr_t header;
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};
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struct xp_stx_word_object_t
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{
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xp_stx_objhdr_t header;
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xp_word_t data[1];
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};
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struct xp_stx_byte_object_t
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{
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xp_stx_objhdr_t header;
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xp_byte_t data[1];
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};
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struct xp_stx_char_object_t
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{
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xp_stx_objhdr_t header;
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xp_char_t data[1];
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};
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struct xp_stx_memory_t
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{
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xp_word_t capacity;
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xp_stx_object_t** slots;
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xp_stx_object_t** free;
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xp_bool_t __malloced;
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};
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struct xp_stx_symtab_t
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{
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xp_word_t* datum;
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xp_word_t size;
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xp_word_t capacity;
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};
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typedef struct xp_stx_symtab_t xp_stx_symtab_t;
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struct xp_stx_t
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{
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xp_stx_memory_t memory;
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xp_stx_symtab_t symtab;
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xp_word_t nil;
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xp_word_t true;
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xp_word_t false;
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xp_word_t smalltalk;
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xp_word_t class_symbol;
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xp_word_t class_metaclass;
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xp_word_t class_association;
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xp_word_t class_object;
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xp_word_t class_class;
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xp_word_t class_array;
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xp_word_t class_bytearray;
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xp_word_t class_string;
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xp_word_t class_character;
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xp_word_t class_system_dictionary;
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xp_word_t class_method;
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xp_word_t class_smallinteger;
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xp_bool_t __malloced;
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xp_bool_t __wantabort; /* TODO: make it a function pointer */
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};
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#define XP_STX_IS_SMALLINT(x) (((x) & 0x01) == 0x01)
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#define XP_STX_TO_SMALLINT(x) (((x) << 1) | 0x01)
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#define XP_STX_FROM_SMALLINT(x) ((x) >> 1)
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#define XP_STX_IS_OINDEX(x) (((x) & 0x01) == 0x00)
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#define XP_STX_TO_OINDEX(x) (((x) << 1) | 0x00)
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#define XP_STX_FROM_OINDEX(x) ((x) >> 1)
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#define XP_STX_NIL XP_STX_TO_OINDEX(0)
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#define XP_STX_TRUE XP_STX_TO_OINDEX(1)
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#define XP_STX_FALSE XP_STX_TO_OINDEX(2)
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#define XP_STX_OBJECT(stx,idx) (((stx)->memory).slots[XP_STX_FROM_OINDEX(idx)])
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#define XP_STX_CLASS(stx,idx) (XP_STX_OBJECT(stx,(idx))->header.class)
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#define XP_STX_ACCESS(stx,idx) (XP_STX_OBJECT(stx,(idx))->header.access)
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#define XP_STX_DATA(stx,idx) ((void*)(XP_STX_OBJECT(stx,idx) + 1))
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#define XP_STX_TYPE(stx,idx) (XP_STX_ACCESS(stx,idx) & 0x03)
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#define XP_STX_SIZE(stx,idx) (XP_STX_ACCESS(stx,idx) >> 0x02)
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#define XP_STX_WORD_INDEXED (0x00)
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#define XP_STX_BYTE_INDEXED (0x01)
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#define XP_STX_CHAR_INDEXED (0x02)
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#define XP_STX_IS_WORD_OBJECT(stx,idx) \
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(XP_STX_TYPE(stx,idx) == XP_STX_WORD_INDEXED)
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#define XP_STX_IS_BYTE_OBJECT(stx,idx) \
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(XP_STX_TYPE(stx,idx) == XP_STX_BYTE_INDEXED)
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#define XP_STX_IS_CHAR_OBJECT(stx,idx) \
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(XP_STX_TYPE(stx,idx) == XP_STX_CHAR_INDEXED)
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#define XP_STX_WORD_OBJECT(stx,idx) \
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((xp_stx_word_object_t*)XP_STX_OBJECT(stx,idx))
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#define XP_STX_BYTE_OBJECT(stx,idx) \
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((xp_stx_byte_object_t*)XP_STX_OBJECT(stx,idx))
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#define XP_STX_CHAR_OBJECT(stx,idx) \
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((xp_stx_char_object_t*)XP_STX_OBJECT(stx,idx))
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#define XP_STX_WORD_AT(stx,idx,n) \
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(((xp_word_t*)(XP_STX_OBJECT(stx,idx) + 1))[n])
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#define XP_STX_BYTE_AT(stx,idx,n) \
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(((xp_byte_t*)(XP_STX_OBJECT(stx,idx) + 1))[n])
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#define XP_STX_CHAR_AT(stx,idx,n) \
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(((xp_char_t*)(XP_STX_OBJECT(stx,idx) + 1))[n])
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#ifdef __cplusplus
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extern "C" {
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#endif
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xp_stx_t* xp_stx_open (xp_stx_t* stx, xp_word_t capacity);
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void xp_stx_close (xp_stx_t* stx);
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#ifdef __cplusplus
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}
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#endif
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#endif
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