96 lines
1.4 KiB
C
96 lines
1.4 KiB
C
#include "factor.h"
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void clear_environment(void)
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{
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int i;
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for(i = 0; i < USER_ENV; i++)
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userenv[i] = F;
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profile_depth = 0;
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}
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#define EXECUTE(w) ((XT)(w->xt))()
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void run(void)
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{
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CELL next;
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/* Error handling. */
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sigsetjmp(toplevel, 1);
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for(;;)
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{
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if(callframe == F)
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{
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callframe = cpop();
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cpop();
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continue;
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}
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callframe = (CELL)untag_cons(callframe);
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next = get(callframe);
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callframe = get(callframe + CELLS);
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if(TAG(next) == WORD_TYPE)
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{
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executing = (WORD*)UNTAG(next);
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EXECUTE(executing);
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}
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else
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dpush(next);
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}
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}
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/* XT of deferred words */
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void undefined()
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{
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general_error(ERROR_UNDEFINED_WORD,tag_word(executing));
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}
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/* XT of compound definitions */
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void docol(void)
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{
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call(executing->parameter);
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}
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/* pushes word parameter */
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void dosym(void)
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{
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dpush(executing->parameter);
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}
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void primitive_execute(void)
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{
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executing = untag_word(dpop());
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EXECUTE(executing);
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}
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void primitive_call(void)
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{
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call(dpop());
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}
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void primitive_ifte(void)
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{
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CELL f = dpop();
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CELL t = dpop();
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CELL cond = dpop();
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call(untag_boolean(cond) ? t : f);
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}
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void primitive_getenv(void)
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{
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FIXNUM e = to_fixnum(dpeek());
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if(e < 0 || e >= USER_ENV)
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range_error(F,e,USER_ENV);
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drepl(userenv[e]);
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}
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void primitive_setenv(void)
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{
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FIXNUM e = to_fixnum(dpop());
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CELL value = dpop();
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if(e < 0 || e >= USER_ENV)
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range_error(F,e,USER_ENV);
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userenv[e] = value;
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}
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