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This commit is contained in:
Brad Nelson
2020-12-29 18:05:08 -08:00
parent f98819949a
commit c9d18f4798
1 changed files with 14 additions and 12 deletions
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26
forth.c
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@ -72,13 +72,13 @@ typedef int64_t dcell_t;
X("STATE", OP_STATE, DUP; tos = (cell_t) &g_state) \
X("BASE", OP_BASE, DUP; tos = (cell_t) &g_base) \
X("LAST", OP_LAST, DUP; tos = (cell_t) &g_last) \
X("&TIB", OP_TIB, DUP; tos = (cell_t) &g_tib) \
X("'TIB", OP_TIB, DUP; tos = (cell_t) &g_tib) \
X("#TIB", OP_NTIB, DUP; tos = (cell_t) &g_ntib) \
X(">IN", OP_TIN, DUP; tos = (cell_t) &g_tin) \
X(":", OP_COLON, t = parse(32, &tmp); \
create((const char *) tmp, t, 0, && OP_DOCOL); \
g_state = -1) \
X("EVAL1", OP_EVAL1, DUP; sp = quit(sp, &tmp); \
X("EVAL1", OP_EVAL1, DUP; sp = eval1(sp, &tmp); \
DROP; if (tmp) (w = tmp); \
if (tmp) goto **(void **) w) \
X("EXIT", OP_EXIT, ip = (void *) *rp--) \
@ -186,21 +186,23 @@ static const char boot[] =
" : words last @ begin dup >name type space >link dup 0= until drop cr ; "
// ( Printing )
" : $. r@ dup cell+ swap @ type r> dup @ + ; "
" : $. r@ dup cell+ swap @ type r> dup @ aligned + cell+ >r ; "
" : .\" [char] \" parse postpone $. dup , 0 do dup c@ c, 1+ loop drop align ; immediate "
// ( Input )
" : accept ( a n -- n ) 0 swap begin 2dup < while key dup nl = if drop nip exit then >r >r over c! 1+ r> 1+ r> repeat drop nip ; "
" : accept ( a n -- n ) 0 swap begin 2dup < while key dup nl = if 2drop nip exit then >r rot r> over c! 1+ -rot swap 1+ swap repeat drop nip ; "
" 200 constant input-limit "
" input-limit . cr "
" 888888 . cr "
" : tib &tib @ ; here &tib ! input-limit allot "
" : refill tib input-limit accept #tib ! 0 >in ! ; "
" : tib 'tib @ ; "
" create input-buffer input-limit allot "
" : tib-setup input-buffer 'tib ! ; "
" : refill tib-setup tib input-limit accept #tib ! 0 >in ! ; "
// ( REPL )
" : prompt .\" ok\" cr ; "
" : eval-line begin >in @ #tib @ < while eval1 repeat ; "
" : boot begin ['] eval-line catch if .\" ERROR\" cr then prompt refill drop again ; "
/* " : query begin ['] eval-line catch if .\" ERROR\" cr then prompt refill drop again ; " */
" : query begin refill eval-line again ; "
" : ok .\" uEForth\" cr prompt query ; "
" ok "
;
@ -271,7 +273,7 @@ static cell_t parse(cell_t sep, cell_t *ret) {
return len;
}
static cell_t *quit(cell_t *sp, cell_t *call) {
static cell_t *eval1(cell_t *sp, cell_t *call) {
*call = 0;
cell_t name;
cell_t len = parse(' ', &name);
@ -290,7 +292,7 @@ static cell_t *quit(cell_t *sp, cell_t *call) {
*g_heap++ = g_DOLIT_XT;
*g_heap++ = n;
} else {
*sp += n;
*++sp = n;
}
} else {
fprintf(stderr, "Bad Word: ");
@ -326,6 +328,6 @@ int main(int argc, char *argv[]) {
#undef X
OP_DOCREATE: DUP; tos = w + sizeof(cell_t) * 2; NEXT;
OP_DODOES: DUP; tos = w + sizeof(cell_t) * 2;
*++rp = (cell_t) ip; ip = (cell_t *) (w + sizeof(cell_t)); NEXT;
*++rp = (cell_t) ip; ip = (cell_t *) *(cell_t *) (w + sizeof(cell_t)); NEXT;
OP_DOCOL: *++rp = (cell_t) ip; ip = (cell_t *) (w + sizeof(cell_t)); NEXT;
}