76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/*
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* $Id: context.c,v 1.10 2005-07-05 09:02:13 bacon Exp $
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*/
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#include <xp/stx/context.h>
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#include <xp/stx/object.h>
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#include <xp/stx/class.h>
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#include <xp/stx/misc.h>
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xp_word_t xp_stx_new_context (xp_stx_t* stx,
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xp_word_t method, xp_word_t args, xp_word_t temp)
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{
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xp_word_t context;
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xp_stx_context_t* obj;
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context = xp_stx_alloc_word_object(
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stx, XP_NULL, XP_STX_CONTEXT_SIZE, XP_NULL, 0);
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obj = (xp_stx_context_t*)XP_STX_OBJECT(stx,context);
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obj->header.class = xp_stx_lookup_class(stx,XP_TEXT("Context"));
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obj->ip = XP_STX_TO_SMALLINT(0);
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obj->method = method;
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obj->arguments = args;
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obj->temporaries = temp;
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return context;
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}
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static xp_byte_t __fetch_byte (
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xp_stx_t* stx, xp_stx_context_t* context_obj)
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{
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xp_word_t ip, method;
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xp_assert (XP_STX_IS_SMALLINT(context_obj->ip));
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ip = XP_STX_FROM_SMALLINT(context_obj->ip);
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method = context_obj->method;
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/* increment instruction pointer */
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context_obj->ip = XP_STX_TO_SMALLINT(ip + 1);
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xp_assert (XP_STX_TYPE(stx,method) == XP_STX_BYTE_INDEXED);
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return XP_STX_BYTEAT(stx,method,ip);
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}
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int xp_stx_run_context (xp_stx_t* stx, xp_word_t context)
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{
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xp_byte_t byte, operand;
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xp_stx_context_t* context_obj;
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context_obj = (xp_stx_context_t*)XP_STX_OBJECT(stx,context);
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while (!stx->__wantabort) {
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/* check_process_switch (); // hopefully */
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byte = __fetch_byte (stx, context_obj);
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#ifdef _DOS
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printf (XP_TEXT("code: %x\n"), byte);
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#else
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xp_printf (XP_TEXT("code: %x\n"), byte);
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#endif
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switch (byte) {
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case PUSH_OBJECT:
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operand = __fetch_byte (stx, context_obj);
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break;
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case SEND_UNARY_MESSAGE:
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operand = __fetch_byte (stx, context_obj);
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break;
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case HALT:
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goto exit_run_context;
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}
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}
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exit_run_context:
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return 0;
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}
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