rajamesandClaude Opus 5.5
084c520a54
word.f18: (NEXT-TOKEN) reads the console or a macro being expanded; labels, branches by name (a label of the word, or a word, now or later), the table of branches waiting, end of word, FOR/NEXT/UNEXT, macros, &NAME, CONST+N, and (ONE), which dispatches a token. A forward branch to a name not yet defined waits on a placeholder symbol, filled in by (DEFINE). dir.f18: constant set here #, ", store, and start, which resolves, clears the tables the ROM used and runs the word it names. main.f18: the ROM itself, entry 12; on an error it stops at (ROM-FAILED) with the code and line in its state, for the loader to report. sym.f18 generalized: any counted string, placeholders, a hash of only a name's own cells. test_host_rom_asm.c gives test_text.c's own texts (accepted and refused), its four real definitions and the ROM's directives to text.c and to the ROM: the same words, the same errors on the same lines, at both widths. The ROM is 2036 words. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
133 lines
3.9 KiB
Plaintext
133 lines
3.9 KiB
Plaintext
\ dir.f18 -- the ROM's directives, and the end of the system's source.
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\
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\ What mkimage.c and text.c's header did in C is said in the source with
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\ these (MACHINE.md, the ROM's language). Each is a machine notion -- an
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\ address, a cell, a value -- and none is FORTH.
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\ constant NAME VALUE NAME is the number VALUE
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\ set NAME VALUE an assembler variable: may be set again
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\ #, VALUE one cell of data at the next word address
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\ ", TOKEN TOKEN, whatever its characters, as a counted string
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\ store ADDR VALUE ADDR := VALUE, anywhere in RAM
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\ start NAME the end: every branch must have its target; the
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\ tables the ROM used are cleared; then NAME runs
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\ A VALUE is a number, a constant, a set variable, CONST+N, here (the next
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\ word address) or &NAME of a word already defined.
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\ ( -- v 1 | 0 0 ) the token as a VALUE; "not a value" if it is none
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: (VALUE)
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(NUMBER) if NN
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-if NUMOK drop drop ERR-BIG (FAIL) 0 0 ;
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NUMOK: drop 1 ;
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NN: drop drop
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&(RESERVED) (WALK) 8 xor if HR drop
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0 (CHAR@) 38 xor if AMPV drop
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(FIND) if NOSYM
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dup 2 + a! @ 2 xor if CV drop
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dup 2 + a! @ 4 xor if CV drop
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drop jump BAD
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CV: drop 3 + a! @ 1 ;
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NOSYM: drop
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(CONST+N) if BAD0 ;
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BAD0: drop drop
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BAD: ERR-VALUE (FAIL) 0 0 ;
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HR: drop (LABEL) 1 ;
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AMPV: drop (TOKN) a! @ -1 + if ONEV drop
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(TOK-SAVE) 1 (MLEN) a! @ -1 + (TOK-SUB)
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(FIND) if BADA
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dup 2 + a! @ 1 xor if OKA drop drop jump BADA0
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OKA: drop 3 + a! @ 1 ;
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BADA: drop
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BADA0: ERR-AMP (FAIL) 0 0 ;
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ONEV: drop jump BAD
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\ ( -- v 1 | 0 0 ) the next token as a VALUE
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: (NEXT-VALUE)
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(NEXT-TOKEN) if MISS drop jump (VALUE)
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MISS: drop ERR-MISSING (FAIL) 0 0 ;
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: (H-CONSTANT)
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(IN-MACRO?) if OK drop ;
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OK: drop
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(NEXT-TOKEN) if MISS drop
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(TOK) (TSAVE) 16 (COPY)
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(NEXT-TOKEN) if MISS drop
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(NUMBER) if NAN
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-if NUM drop drop ERR-BIG jump (FAIL)
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NUM: drop (NAME-BACK) 2 jump (DEFINE)
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NAN: drop drop ERR-VALUE jump (FAIL)
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MISS: drop ERR-MISSING jump (FAIL)
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: (H-SET)
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(IN-MACRO?) if OK drop ;
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OK: drop
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(NEXT-TOKEN) if MISS drop
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(TOK) (TSAVE) 16 (COPY)
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(NEXT-VALUE) if BADV drop
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(NAME-BACK) 4 jump (DEFINE)
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BADV: drop drop ;
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MISS: drop ERR-MISSING jump (FAIL)
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\ here alone is not something to assemble: only a VALUE
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: (H-HERE) ERR-TARGET jump (FAIL)
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: (H-CELL)
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(IN-MACRO?) if OK drop ;
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OK: drop
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(NEXT-VALUE) if BADV drop
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(LABEL) drop jump (EMIT)
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BADV: drop drop ;
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: (H-STRING)
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(IN-MACRO?) if OK drop ;
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OK: drop
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(RAW-TOKEN) if MISS drop
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(LABEL) drop
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(TOKN) a! @ 4 + 2/ 2/ (T1) a! ! 0 (T2) a! !
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L: (T2) a! @ (T1) a! @ xor if D drop
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(T2) a! @ (TOK) + a! @ (EMIT)
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(T2) a! @ 1 + ! jump L
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D: drop ;
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MISS: drop ERR-MISSING jump (FAIL)
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: (H-STORE)
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(IN-MACRO?) if OK drop ;
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OK: drop
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(NEXT-VALUE) if BADV drop (T1) a! !
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(NEXT-VALUE) if BADV drop
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(T1) a! @ b! !b ;
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BADV: drop drop ;
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\ ( -- ) clear the tables the ROM uses only while it assembles: the symbol
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\ table in dictionary space, the branches, labels and names in the block
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\ window, the saved token and macro body in the text input buffer
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: (CLEAR)
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DICT-W a! DICT-END DICT-W inv 1 + + -1 + FOR 0 !+ NEXT
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BUF0 a! 1023 FOR 0 !+ NEXT
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TIB-W a! 259 FOR 0 !+ NEXT
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0 (RECN) a! ! 0 (POOLN) a! ! 0 (NREF) a! ! 0 (NLAB) a! !
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0 (WNP) a! ! 0 (NFOR) a! ! 0 (RDEPTH) a! ! ;
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\ start NAME: the system's source has ended
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: (H-START)
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(IN-MACRO?) if OK drop ;
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OK: drop
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(NEXT-TOKEN) if MISS drop
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(TOK) (TSAVE) 16 (COPY)
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(END-WORD)
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(FAILED) a! @ if F0 drop ;
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F0: drop
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(NREF) a! @ if NOREF drop
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ERR-UNDEFINED (FAIL) (REFS) 1 + a! @ (ERRLINE) a! ! ;
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NOREF: drop
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(LABEL) drop
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(NAME-BACK)
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(FIND) if NOTW
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dup 2 + a! @ 1 xor if ISW drop drop jump NOTW0
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ISW: drop 3 + a! @ (T1) a! !
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(CLEAR)
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0 DSTACK-REG a! ! 0 RSTACK-REG a! !
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(T1) a! @ push ;
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NOTW: drop
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NOTW0: ERR-START jump (FAIL)
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MISS: drop ERR-MISSING jump (FAIL)
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