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comp.main.asm
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comp.main.asm
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; SPDX-PackageSummary: Action! Programming Language
; SPDX-PackageOriginator: Clinton W Parker
; SPDX-PackageCopyrightText: Copyright 1983 by Clinton W Parker
; SPDX-License-Identifier: GPL-3.0-or-later
; SPDX-FileName: comp.main.asm
; SPDX-FileCopyrightText: Copyright 2023 Scott Giese
;======================================
; Main compiler entry
;======================================
ccompile
;======================================
;
;======================================
spl ;.proc
jsr splend
lda nxttoken
cmp #quote
bne _spl1 ; no name
jsr lexget.lget
jmp _spl2
_spl1 lda top1
sta top+1
jsr chkcur._ldtop
beq _splrtn ; no program !
jsr getnext
_spl2 jsr getnext
; <program> _:= <module list> MODULE <module>
; | (MODULE) <module>
; <module> _:= (<dcl list>) (<segment list>)
jsr declare
jsr segment
cmp #modid ; another module ?
beq _spl2 ; yes
cmp #eofid
bne _spl4
lda #1 ; save run address
jsr cprop
sta INITAD
stx INITAD+1
; insert return, just in case
_rtn lda #$60 ; RTS
jsr push1
; get qcode size
sec
lda qcode
sbc codebase
sta codesize
lda qcode+1
sbc codebase+1
sta codesize+1
; patch array addresses
lda arrayptr+1
; ORA arrayPtr
beq _splrtn
_spl3 ldy #1
lda (arrayptr),Y
sta arg1
dey
lda (arrayptr),Y
sta arg0
jsr getcdoff
sta (arrayptr),Y
txa
iny
sta (arrayptr),Y
clc
iny
lda qcode
adc (arrayptr),Y
sta qcode
iny
lda qcode+1
adc (arrayptr),Y
sta qcode+1
lda arg0
sta arrayptr
lda arg1
sta arrayptr+1
bne _spl3
; LDA arrayPtr
; BNE _SPL3
lda qcode
cmp MEMTOP
lda qcode+1
sbc MEMTOP+1
bcs enderr._spl5
_splrtn rts
_spl4 jsr getcdoff ; no main PROC
sta INITAD
stx INITAD+1
jsr stmtlist
cmp #eofid
beq _rtn
;EndErr LDY #0
; STY $2E3 ; zap run address
enderr ldy #ender
jmp dostmt.fierr
_spl5 jmp codeincr.cderr ; out of qcode space
;.endproc
;=====================================
; Declaration processing
;=====================================
; <dcl list> _:= <dcl list> <dcl> | <dcl>
; <dcl> _:= <simple dcl> | <array dcl> | <def dcl>
cderr lda #0 ; reset qcode before err
tay
jsr loadcd
_derr jmp dclerr
_type lda #+record-(vart-char)-1
sta type
jsr makeentry
lda addr
ldx addr+1
ldy #2
jsr savecd.savstk
ldy #0
jsr savecd
jsr getnext
cmp #equalid
bne _derr
jsr getnext
cmp #lbrack
bne _derr
sec
lda #0
sbc codeoff
sta qcode
lda #0
sbc codeoff+1
sta qcode+1
jsr getnext
_t1 cmp #char
bcc cderr
cmp #define
bcs cderr
tax
clc
adc #+typet-vart
sta type
lda varsize-char,X
sta afcur
_t2 jsr makeentry
lda afcur
jsr codeincr
jsr getnext
cmp #comma
beq _t2
cmp #rbrack
bne _t1
ldy #2
jsr stkp
ldx qcode+1
bne cderr
lda qcode
ldy #0
jsr storprops
lda #0
tay
jsr loadcd
jsr getnext
declare jsr dclend
cmp #char
bcs _dcl0
_drtn rts
_dcl0 cmp #typeid
beq cderr._type
cmp #record
bne _dcl1
; record dcl.
lda #0
jsr getprop
stx afcur
ldx nxttoken
lda #typet-(vart-char)-1
sta type
bne _dcl2 ; [unc]
_dcl1 cmp #define
beq _define
bcs _drtn
sta type
tax
ldy varsize-char,X
sty afcur
ldx nxttoken
cpx #func
beq _drtn
cpx #array
beq dclerr._arrdcl
_dcl2 cpx #pointer
bne _sdcl
ldy #0
sty afcur
beq dclerr._arrdcl ; [unc]
; <simple dcl> _:= <type> <id eq list>
; <id eq list> _:= <id eq list> , <id eq> | <id eq>
; <id eq> _:= <id> (= <constant>)
_sdcl jsr makeentry
ldx param
beq _sdcl0
jsr params
ldx param
bpl _sdcl1
bmi _sdcl2
_sdcl0 lda nxttoken
cmp #equalid
bne _sdcl1
jsr ideq
iny
jsr storprops
jsr getnext
bne _sdcl2
_sdcl1 lda afcur
jsr codeincr
_sdcl2 jsr getnext
cmp #comma
_sdcl3 beq _sdcl
jmp declare
; <def dcl> _:= DEFINE <def list>
; <def list> _:= <def list> , <def> | <def>
; <def> _:= <id> = <str const>
_define
jsr makeentry
ldy #0
lda #defid
sta (props),Y
jsr getnext
cmp #equalid
bne dclerr
lda nxttoken
cmp #quote
bne dclerr
ldy #0
lda (symtab),Y
clc
adc #2 ; real size + EOL
jsr stincr
jsr getnext ; string itself
jsr getnext ; dummy string
jsr getnext
cmp #comma
_def1 bne _sdcl3
beq _define
dclerr ldy #dcler
jmp splerr
; <array dcl> _:= <type> ARRAY <array list>
; <array list> _:= <array list> , <array> | <array>
; <array> _:= <id> ((<constant>)) (= <constant>)
_arrdcl
clc
adc #8
sta type
jsr getnext
_arrd1 jsr makeentry
lda #2
sta numargs ; variable space
ldx param
bne _arrd5
lda nxttoken
ldx afcur
beq _arrd2 ; no size for pointers
cmp #lparen
bne _arrd2
lda #4
sta numargs
lda arrayptr
ldx arrayptr+1
ldy #0
jsr storevar
jsr getarsz
jsr getnext
; check for small byte array
ldy #2
lda #0
cmp (qcode),Y
iny
lda #1
sbc (qcode),Y
bcs _arrd6 ; size <= 256
_ard2a jsr getnext
cmp #rparen
bne dclerr
lda nxttoken
cmp #equalid
beq _ard2c
_arrd3 lda numargs
bne _ard3a
; small array
ldy #2
lda (qcode),Y
bne _ard3b
inc qcode+1
bne _arrd4 ; [unc]
; array var
_ard3a cmp #4
bmi _ard3b
; large array with memory
ldx qcode
stx arrayptr
ldx qcode+1
stx arrayptr+1
_ard3b jsr codeincr
_arrd4 jsr getnext
cmp #comma
beq _arrd1
jmp declare
_arrd5 jsr params
ldx param
bpl _arrd3
bmi _arrd4
_arrd2 cmp #equalid
bne _arrd3
_ard2c jsr ideq
ldy numargs
beq _ard2b
ldy #0
jsr storevar
jsr getcdoff
_ard2b ldy #1
jsr storprops
jsr getnext
lda numargs
jmp _ard3b
_arrd6 ldy #0
lda (props),Y
cmp #arrayt+intt
bcs _ard2a
; small byte array
sty numargs
ora #8
sta (props),Y
iny
jsr getcdoff
jsr storprops
bne _ard2a ; [unc]
chkparam
ldx param
chkp beq makeentry.derr
pla
pla
jmp getnext
;======================================
; MakeEntry()
;======================================
makeentry .proc
lda nxttoken
cmp #undec
beq derr._me1
bcs _mev ; var of some kind
cmp #record
beq _mev
cmp #typet
bcc chkparam
cmp #eofid
bcs chkparam
_mev lda qglobal
beq chkp
jsr gnlocal
cmp #undec
beq derr._me0
derr jmp dclerr
_me0 sta nxttoken
_me1 lda #0
jsr nxtprop
sec
lda #vart-char
adc type
sta (props),Y ; type
and #7
tax
lda vartype-1,X
sta op
iny
jsr getcdoff
jsr storprops
jmp getnext
.endproc
;======================================
; IdEq()
;======================================
ideq .proc
jsr getnext
ldx param
bne params.perr
jmp mnum
.endproc
;======================================
; GetArSz()
;======================================
getarsz .proc
jsr ideq
sty arg0 ; Y should = 0
sty arg1
ldy afcur ; #elements * element size
_gas clc
lda arg0
adc afsize
sta arg0
lda arg1
adc afsize+1
sta arg1
dey
bne _gas
tax
lda arg0
ldy #2
jmp storevar
.endproc
;======================================
; StorProps(low, high, index)
;======================================
storprops .proc
sta (props),Y
txa
iny
sta (props),Y
rts
.endproc
;ChkNext PROC ; ChkNext()
; LDA nxtToken
; CMP #undec
; BNE _ChkN
; JSR GNlocal
;:ChkN JMP GetNext
;======================================
; Params()
;======================================
params .proc
ldy #0
lda (props),Y ; get var type
pha
lda #3
jsr cprop
cmp #8
bcs perr
adc #1
sta (props),Y
tay
; see if time to update gbase
ldx nxttoken
cpx #rparen
bne _p1
; see AMPL.SEG
clc
adc gbase
sta gbase
bcc _p1
inc gbase+1
_p1 pla
bmi perr._par1
cmp #typet+8
beq perr._par2
perr jmp segment.argerr
;:Par1 CMP #varT+realT
; BEQ PErr
_par1 cmp #vart+intt
bcc _par3 ; one byte arg
; two byte arg
_par2 and #$1f
inc argbytes
_par3 and #$9f
inc argbytes
sta (props),Y
rts
.endproc
;--------------------------------------
;--------------------------------------
varsize .byte 1,1,2,2,2,6
;====================================
; Statement processing
;====================================
; <stmt list> _:= <stmt list> <stmt> | <stmt>
; <stmt> _:= <assign> |
; <array assign> |
; <if> |
; <for> |
; <while> |
; <do> |
; <call> |
; <return> |
; EXIT
stmtlist .proc
jsr clrtemps
sta op
jsr smtend
cmp #lbrack
bne _sl5
; machine qcode block
jsr trashy
_sl1 ldx nxttoken
cpx #rbrack
beq _sl4
jsr mnum
cpx #0
beq _sl2
jsr push2 ; 2 byte number
bcs _sl3 ; [unc]
_sl2 jsr push1 ; single byte
_sl3 jsr getnext
bne _sl1 ; [unc]
_sl4 jsr getnext
jmp recret.nxtstmt
_sl5 ldx nxttoken
cmp #vart+chart
bcc _sl6
cmp #funct
bcc assign
; routine reference
cpx #lparen
beq call
jsr procref
bne assign.ass0 ; [unc]
_sl6 cmp #undec
bne _sl7
jsr getalias
bne _sl5 ; [unc]
_sl7 cmp #typet
bne _sl8
jsr etype
jmp arassign.arass1
_sl8 cmp #typet+8
bne _sl9
jsr etypea
jmp arassign.arass1
_sl9 ldx #<stmtlst
ldy #>stmtlst
jmp lookup
.endproc
; <call> _:= <proc var>((<arglist>))
; <proc var> _:= <id>
; <arglist> _:= <arglist> , <exp> | <exp>
call .proc
jsr pf
jsr popst
jmp recret.nxtstmt
.endproc
; <assign> _:= <id> = <exp>
assign .proc
cmp #arrayt
bcs arassign
ass0 jsr pushnext
ass1 eor #equalid
bne asserr
jsr pushop ; push 0 on op stack
jsr getnext
sta op
cmp #equalid
bne _ass2
lda #0
sta op
jsr copyst
; check for temps
iny
and #$f8
cmp #arrayt+8
bne _a1a
ldy #3
lda (stack),Y
_a1a and #$20
beq _a1b
iny
lda (stack),Y
tax
; incr temps
cpx #args ;
bcc _a1b ; are these 4 instr.
cpx #args+16 ; needed?
bcs _a1b ;
inc temps-args,X
_a1b jsr getnext
_ass2 jsr exp.exp1
jsr cgassign
jmp stmtlist
asserr ldy #asser
jmp splerr
.endproc
; <array assign> _:= <id> ( <exp> ) = <exp>
arassign .proc
jsr arrref
arass1 ldy #0
lda (stack),Y
bpl _ara1 ; record element
cmp #vart
bcc assign.asserr ; const
_ara1 jsr getnext
bne assign.ass1 ; [unc]
.endproc
; <if> _:= IF <exp> THEN <stmt list
; (ELSE <stmt list>) FI
ifstmt .proc
lda #7
jsr getframe
ldy #5
lda #0
sta (frame),Y
_if jsr condexp
cmp #then
bne thnerr
; save current Y
lda cury
ldy #6
sta (frame),Y
jsr recret.nxtstmt
; restore Y
tax
ldy #6
lda (frame),Y
sta cury
txa
cmp #elseif
bne _else
ldy #4
jsr frameadr.fadr1
ldy #4
jsr framecd.fcd1
ldx arg4
ldy arg5
jsr pushjmp
jsr frameadr
jsr filljmp.fjmp1
jmp _if
_else cmp #else
bne _fi
jsr frameadr
jsr framecd
ldy #0 ; flag as end of list
jsr pushjmp
jsr filljmp.fjmp1
jsr recret.nxtstmt
_fi ldy #fier
cmp #fi
bne dostmt.fierr
ldy #4
jsr frameadr.fadr1
beq if1 ; if no ELSEIF
jsr filljmp.fjmp1
if1 jsr trashy
jsr frameadr
beq recret ; in case of DO loop
jsr filljmp.fjmp1
.endproc
; RecRet() pops stack and returns
; -------------------------------
recret .proc
jsr freeframe
nxtstmt jsr getnext
jmp stmtlist
.endproc
; pops stack
; ----------
freeframe .proc
ldy #0
lda (frame),Y
tax
iny
lda (frame),Y
stx frame
sta frame+1
rts
.endproc
thnerr ldy #thener
sterr jmp splerr
; <do> _:= DO <stmt list> (UNTIL <exp>) OD
dostmt .proc
jsr doinit
lda #0
ldy #3
sta (frame),Y
bne whstmt.wh1 ; [unc]
fierr cmp #undec
bne sterr
jmp mnum._varerr
.endproc
; <while> _:= WHILE <exp> <do>
whstmt .proc
jsr doinit
jsr condexp
ldy #doer
cmp #do
bne sterr
wh1 jsr recret.nxtstmt
wh2 cmp #untilid
bne _wh3
jsr condexp
bne _wh4 ; [unc]
_wh3 ldy #4
jsr frameadr.fadr1
jsr pushjmp
lda token
_wh4 ldy #oder
cmp #od
bne dostmt.fierr
ldy #6
jsr frameadr.fadr1
stx whaddr
sty whaddr+1
jmp ifstmt.if1
.endproc
;======================================
; EXITstmt()
;======================================
exitstmt .proc
ldy #exiter
ldx whaddr+1
beq sterr
ldy #2 ; get pointer to EXIT list
lda (whaddr),Y
tax
iny
lda (whaddr),Y
pha
lda qcode+1 ; link in JMP for EXIT
sta (whaddr),Y
lda qcode
dey
sta (whaddr),Y
pla
tay
jsr pushjmp
jmp recret.nxtstmt
.endproc
;======================================
; <for> _:= FOR <id> = <exp> TO <exp>
; (STEP <exp>) <do>
;======================================
forerr ldy #forer
bne dostmt.fierr
;======================================
;