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forth: consolidation
This commit is contained in:
Virgil Dupras
parent
f4b969986d
commit
ac914c3847
131
forth/forth.asm
131
forth/forth.asm
@ -168,12 +168,11 @@ INTERPRET:
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.dw FIND_
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.dw CSKIP
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.dw FBR
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.db 34
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.db 32
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; It's a word, execute it
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.dw FLAGS_
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.dw FETCH
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.dw NUMBER
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.dw 0x0001 ; Bit 0 on
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.dw ONE ; Bit 0 on
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.dw OR
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.dw FLAGS_
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.dw STORE
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@ -186,11 +185,11 @@ INTERPRET:
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.dw FLAGS_
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.dw STORE
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.dw BBR
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.db 41
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.db 39
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; FBR mark, try number
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.dw PARSEI
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.dw BBR
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.db 46
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.db 44
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; infinite loop
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; *** Collapse OS lib copy ***
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@ -212,12 +211,6 @@ intoHL:
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pop de
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ret
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intoDE:
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ex de, hl
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call intoHL
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ex de, hl ; de preserved by intoHL, so no push/pop needed
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ret
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; add the value of A into HL
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; affects carry flag according to the 16-bit addition, Z, S and P untouched.
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addHL:
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@ -231,22 +224,13 @@ addHL:
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; Copy string from (HL) in (DE), that is, copy bytes until a null char is
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; encountered. The null char is also copied.
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; HL and DE point to the char right after the null char.
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strcpyM:
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strcpy:
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ld a, (hl)
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ld (de), a
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inc hl
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inc de
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or a
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jr nz, strcpyM
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ret
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; Like strcpyM, but preserve HL and DE
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strcpy:
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push hl
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push de
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call strcpyM
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pop de
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pop hl
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jr nz, strcpy
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ret
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; Compares strings pointed to by HL and DE until one of them hits its null char.
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@ -273,20 +257,20 @@ strcmp:
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; early, set otherwise)
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ret
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; Compares strings pointed to by HL and DE up to A count of characters. If
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; Compares strings pointed to by HL and DE up to NAMELEN count of characters. If
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; equal, Z is set. If not equal, Z is reset.
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strncmp:
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push bc
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push hl
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push de
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ld b, a
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ld b, NAMELEN
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.loop:
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ld a, (de)
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cp (hl)
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jr nz, .end ; not equal? break early. NZ is carried out
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; to the called
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cp 0 ; If our chars are null, stop the cmp
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or a ; If our chars are null, stop the cmp
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jr z, .end ; The positive result will be carried to the
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; caller
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inc hl
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@ -414,17 +398,6 @@ parseDecimal:
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ret
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; *** Support routines ***
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; Sets Z if (HL) == E and (HL+1) == D
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HLPointsDE:
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ld a, (hl)
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cp e
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ret nz ; no
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inc hl
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ld a, (hl)
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dec hl
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cp d ; Z has our answer
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ret
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; Find the entry corresponding to word where (HL) points to and sets DE to
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; point to that entry.
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; Z if found, NZ if not.
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@ -440,7 +413,6 @@ find:
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ex de, hl
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sbc hl, bc
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ex de, hl ; We're good, DE points to word name
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ld a, NAMELEN
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call strncmp
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pop de ; <-- lvl 1, return to wordref
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jr z, .end ; found
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@ -457,7 +429,9 @@ find:
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; Z is set if DE point to 0 (no entry). NZ if not.
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.prev:
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dec de \ dec de \ dec de ; prev field
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call intoDE
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ex de, hl
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call intoHL
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ex de, hl ; de preserved by intoHL, so no push/pop needed
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; DE points to prev. Is it zero?
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xor a
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or d
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@ -637,7 +611,6 @@ numberWord:
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push de
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jp next
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.db 0b10 ; Flags
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NUMBER:
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.dw numberWord
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@ -652,7 +625,6 @@ litWord:
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ld (IP), hl
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jp next
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.db 0b10 ; Flags
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LIT:
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.dw litWord
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@ -674,8 +646,7 @@ EXIT:
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.db 0
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QUIT:
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.dw compiledWord
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.dw NUMBER
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.dw 0
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.dw ZERO
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.dw FLAGS_
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.dw STORE
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.dw .private
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@ -961,7 +932,7 @@ SCPY:
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.dw nativeWord
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pop hl
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ld de, (HERE)
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call strcpyM
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call strcpy
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ld (HERE), de
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jp next
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@ -1090,8 +1061,7 @@ ISWS:
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.dw NUMBER
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.dw 33
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.dw CMP
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.dw NUMBER
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.dw 1
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.dw ONE
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.dw PLUS
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.dw NOT
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.dw EXIT
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@ -1139,27 +1109,27 @@ TOWORD:
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.db 0
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WORD:
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.dw compiledWord
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.dw WORDBUF_ ; ( a )
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.dw NUMBER ; ( a )
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.dw WORDBUF
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.dw TOWORD ; ( a c )
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; branch mark
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.dw OVER ; ( a c a )
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.dw STORE ; ( a )
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.dw NUMBER ; ( a 1 )
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.dw 1
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.dw ONE ; ( a 1 )
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.dw PLUS ; ( a+1 )
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.dw CIN ; ( a c )
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.dw DUP ; ( a c c )
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.dw ISWS ; ( a c f )
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.dw CSKIP ; ( a c )
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.dw BBR
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.db 20 ; here - mark
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.db 18 ; here - mark
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; at this point, we have ( a WS )
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.dw DROP
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.dw NUMBER
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.dw 0
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.dw ZERO
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.dw SWAP ; ( 0 a )
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.dw STORE ; ()
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.dw WORDBUF_
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.dw NUMBER
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.dw WORDBUF
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.dw EXIT
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.wcpy:
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@ -1237,7 +1207,7 @@ ENTRYHEAD:
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pop hl
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ld de, (HERE)
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call strcpy
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ex de, hl ; (HERE) now in HL
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ld hl, (HERE)
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ld de, (CURRENT)
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ld a, NAMELEN
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call addHL
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@ -1319,17 +1289,9 @@ PARSEPTR_:
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.dw sysvarWord
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.dw PARSEPTR
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.db "(wbuf)"
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.fill 1
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.dw PARSEPTR_
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.db 0
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WORDBUF_:
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.dw sysvarWord
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.dw WORDBUF
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.db "FLAGS"
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.fill 2
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.dw WORDBUF_
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.dw PARSEPTR_
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.db 0
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FLAGS_:
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.dw sysvarWord
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@ -1674,10 +1636,34 @@ XOR:
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push hl
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jp next
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; It might look peculiar to have specific words for "0" and "1", but although
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; it slightly beefs ups the ASM part of the binary, this one-byte-save-per-use
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; really adds up when we compare total size.
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.db "0"
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.fill 6
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.dw XOR
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.db 0
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ZERO:
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.dw nativeWord
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ld hl, 0
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push hl
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jp next
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.db "1"
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.fill 6
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.dw ZERO
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.db 0
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ONE:
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.dw nativeWord
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ld hl, 1
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push hl
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jp next
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; ( a1 a2 -- b )
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.db "SCMP"
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.fill 3
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.dw XOR
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.dw ONE
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.db 0
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SCMP:
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.dw nativeWord
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@ -1721,16 +1707,16 @@ CSKIP:
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jp z, next ; False, do nothing.
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ld hl, (IP)
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ld de, NUMBER
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call HLPointsDE
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call .HLPointsDE
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jr z, .isNum
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ld de, FBR
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call HLPointsDE
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call .HLPointsDE
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jr z, .isBranch
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ld de, BBR
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call HLPointsDE
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call .HLPointsDE
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jr z, .isBranch
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ld de, LIT
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call HLPointsDE
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call .HLPointsDE
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jr nz, .isWord
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; We have a literal
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inc hl \ inc hl
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@ -1752,6 +1738,17 @@ CSKIP:
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ld (IP), hl
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jp next
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; Sets Z if (HL) == E and (HL+1) == D
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.HLPointsDE:
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ld a, (hl)
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cp e
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ret nz ; no
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inc hl
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ld a, (hl)
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dec hl
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cp d ; Z has our answer
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ret
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; This word's atom is followed by 1b *relative* offset (to the cell's addr) to
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; where to branch to. For example, The branching cell of "IF THEN" would
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; contain 3. Add this value to RS.
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