108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
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* $Id: interp.c,v 1.4 2005-06-08 16:00:51 bacon Exp $
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*/
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#include <xp/stx/interp.h>
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#define XP_STX_PROCESS_SIZE 3
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#define XP_STX_PROCESS_STACK 0
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#define XP_STX_PROCESS_STACK_TOP 1
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#define XP_STX_PROCESS_LINK 2
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#define XP_STX_CONTEXT_SIZE 6
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#define XP_STX_PROCESS_LINK 0
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#define XP_STX_PROCESS_METHOD 1
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#define XP_STX_PROCESS_ARGUMENTS 2
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#define XP_STX_PROCESS_TEMPORARIES 3
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typedef int (*byte_code_func_t) (xp_stx_t*
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static byte_code_func_t byte_code_funcs[] =
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{
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XP_NULL,
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push_instance,
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push_argyment,
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push_temporary,
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push_literal,
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push_constant,
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store_instance,
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store_temporary,
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send_message,
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send_unary,
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send_binary,
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XP_NULL,
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do_primitive,
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XP_NULL,
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do_special
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};
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xp_word_t xp_stx_new_method (xp_stx_t* stx)
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{
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xp_word_t method;
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method = xp_stx_alloc_object(XP_STX_METHOD_SIZE);
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return method;
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}
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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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context = xp_stx_alloc_object(XP_STX_CONTEXT_SIZE);
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XP_STX_CLASS(stx,context) = stx->class_context;
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XP_STX_AT(stx,context,XP_STX_CONTEXT_METHOD) = method;
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XP_STX_AT(stx,context,XP_STX_CONTEXT_ARGUMENTS) = args;
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XP_STX_AT(stx,context,XP_STX_CONTEXT_TEMPORARIES) = temp;
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return context;
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}
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xp_word_t xp_stx_new_process (xp_stx_t* stx, xp_word_t method)
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{
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xp_word_t process, stx;
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process = xp_stx_alloc_object(XP_STX_PROCESS_SIZE);
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stack = xp_new_array(stx,50);
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XP_STX_CLASS(stx,process) = stx->class_process;
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XP_STX_AT(stx,process,XP_STX_PROCESS_STACK) = stack;
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XP_STX_AT(stx,process,XP_STX_PROCESS_STACKTOP) = XP_STX_FROM_SMALLINT(6);
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XP_STX_AT(stx,process,XP_STX_PROCESS_LINK) = XP_STX_FROM_SMALLINT(1);
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XP_STX_AT(stx,stack,0) = stx->nil; /* argument */
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XP_STX_AT(stx,stack,1) = XP_STX_FROM_SMALLINT(0); /* previous link */
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XP_STX_AT(stx,stack,2) = stx->nil; /* context */
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XP_STX_AT(stx,stack,3) = XP_STX_FROM_SMALLINT(1); /* return point */
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XP_STX_AT(stx,stack,4) = method;
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XP_STX_AT(stx,stack,5) = XP_STX_FROM_SMALLINT(1); /* byte offset */
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return process;
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}
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int xp_stx_execute (xp_stx_t* stx, xp_word_t process)
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{
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int low, high;
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byte_code_func_t bcfunc;
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stack = XP_STX_AT(stx,process,XP_PROCESS_STACK);
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stack_top = XP_STX_AT(stx,process,XP_PROCESS_STACK_TOP);
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link = XP_STX_AT(stx,process,XP_PROCESS_LINK);
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for (;;) {
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low = (high = nextByte(&es)) & 0x0F;
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high >>= 4;
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if(high == 0) {
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high = low;
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low = nextByte(&es);
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}
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bcfunc = byte_code_funcs[high];
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if (bcfunc != XP_NULL) {
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bcfunc (stx, low);
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}
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}
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return 0;
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}
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