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A2osX/SCMASM.30/SCMASM.S.SYMT.txt

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SCMASM.SYSTEM 3.0 & BASIC.SYSTEM 1.5 source code......many bugfxes & enh, new commands.....
2022-03-06 22:28:52 +00:00
NEW
AUTO 3,1
*--------------------------------------
* INITIALIZE SYMBOL TABLE
* 1. SET EOT TO BOT
* 2. CLEAR HASH POINTER TABLE
*--------------------------------
STINIT LDA LO.MEM START OF SYMBOL TABLE
STA EOT
LDA LO.MEM+1
STA EOT+1
STA MACLBL+1 PRIVATE LABELS GO DOWN FROM THERE
LDX #56 # BYTES IN HASH POINTER TABLE
LDA #0
STA MACLBL
STA CURRENT.MAJOR.LABEL+1
.1 STA HSHTBL-1,X
DEX
BNE .1
.DO AUXMEM
LDA RDRAM
LDA RDRAM
LDX #AUX.IMAGE.LEN-1
.2 LDA AUX.IMAGE,X
STA AUX.CODE,X
DEX
BPL .2
BACK.TO.ROM
PHA
LDA RDROM
PLA
.FIN
RTS RETURN WITH X=0
*--------------------------------
.DO AUXMEM
LDA.STPNTR
BIT RDRAM
JSR LDA.STPNTR.AUX
JMP BACK.TO.ROM
*
ADC.STPNTR
BIT RDRAM
JSR ADC.STPNTR.AUX
JMP BACK.TO.ROM
*
SBC.STPNTR
BIT RDRAM
JSR SBC.STPNTR.AUX
JMP BACK.TO.ROM
*
LDA.PNTR
BIT RDRAM
JSR LDA.PNTR.AUX
JMP BACK.TO.ROM
*
LDA.TPTR
BIT RDRAM
JSR LDA.TPTR.AUX
JMP BACK.TO.ROM
*
LDA.SRCP
BIT RDRAM
JSR LDA.SRCP.AUX
JMP BACK.TO.ROM
*
STA.PNTR
STA WRAUX
STA (PNTR),Y
STA WRMAIN
RTS
STA.STPNTR
STA WRAUX
STA (STPNTR),Y
STA WRMAIN
RTS
*--------------------------------
AUX.IMAGE
LDA.STPNTR.AUX .EQ *-AUX.IMAGE+AUX.CODE
STA RDAUX
LDA (STPNTR),Y
STA RDMAIN
RTS
ADC.STPNTR.AUX .EQ *-AUX.IMAGE+AUX.CODE
STA RDAUX
ADC (STPNTR),Y
STA RDMAIN
RTS
SBC.STPNTR.AUX .EQ *-AUX.IMAGE+AUX.CODE
STA RDAUX
SBC (STPNTR),Y
STA RDMAIN
RTS
LDA.PNTR.AUX .EQ *-AUX.IMAGE+AUX.CODE
STA RDAUX
LDA (PNTR),Y
STA RDMAIN
RTS
LDA.TPTR.AUX .EQ *-AUX.IMAGE+AUX.CODE
STA RDAUX
LDA (TPTR),Y
STA RDMAIN
RTS
LDA.SRCP.AUX .EQ *-AUX.IMAGE+AUX.CODE
STA RDAUX
LDA (SRCP),Y
STA RDMAIN
RTS
AUX.IMAGE.LEN .EQ *-AUX.IMAGE
.FIN
*--------------------------------
* A table of 28 pointers begins at $130, called HSHTBL.
* Each pointer points to the beginning of a chain of
* symbol entries. The entries on a chain are kept
* in alphabetical order. If a chain is empty, the
* pointer = $0000.
*
* HSHTBL+$00: Chain for target file entries
* HSHTBL+$02: Chain for labels starting with "A"
* HSHTBL+$04: Chain for labels starting with "B"
* - - -
* HSHTBL+$34: Chain for labels starting with "Z"
* HSHTBL+$36: Chain for Macro Names and Skeletons
*
* Format of Target File Entry:
* 0,1 -- Forward chain pointer (0=end of chain)
* 2,3 -- Length of target file in bytes
* 4 -- Length of code name = $02
* 5,6 -- Target file code name:
* 5: "@" = $40
* 6: $40 + target file number ($00-$1F)
*
* Format of Label Entry:
* 0,1 -- Forward chain pointer (0=end of chain)
* 2-5 -- Value of label
* 6 -- Flags and length of label name:
* Bits 5-0: length of label name ($01-$20)
* Bit 6: =1 if forward reference
* Bit 7: =1 if has local labels
* 7 -- First character of label name, and flag.
* Bit 7 = 1 if label is .SEt label.
* thru 6+n -- The rest of the label name, with bit 7 = 0
*
* If the label has local labels, they follow.
* Each local label occupies two bytes:
* 1 -- Label number (0-99) +128
* 2 -- Label value (distance from value of
* named label)
* The local label list is terminated with a $00
* in the label number position.
*
* Format of Macro Definition Entry:
* 0,1 -- Chain to next macro name
* 2,3 -- $0000
* 4 -- Length of macro name
* 5 -- "[" + $5B
* 6-n -- Rest of Macro name
* etc.-- The packed skeleton lines, each
* terminated by $00. A final $00
* terminates the skeleton.
*
* Private Labels are kept in a separate table.
* Each label takes 7 bytes. Bytes 0-3 are the
* value, byte 4 is the colon number + $80,
* and bytes 5 and 6 are the macro call number.
* The Private Label table grows downward from
* MACLBL toward $0800.
*
*--------------------------------
* PACK SYMBOL FROM INPUT LINE
* UP TO 32 CHARACTERS PACKED AT SYMBOL+7
* AND FOLLOWING.
* # CHARS STORED IN SYMBOL+6
* RETURN CARRY CLEAR IF NO SYMBOL
* RETURN CARRY SET IF GOOD SYMBOL
*--------------------------------
PACK LDX #0 POINT AT 1ST CHAR IN NAME
CMP #CHR.PERIOD LOCAL SYMBOL?
BEQ .1 YES
CMP #': COLON MEANS MACRO PRIVATE LABEL
BNE .3 NO, NORMAL SYMBOL
.1 STA SYMBOL+7 SAVE PERIOD OR COLON
JSR GNC.UC GET NEXT CHAR
JSR CHECK.DIGIT
BCC .4 NO, BAD SYMBOL
JSR DECN CONVERT TO BINARY
LDX #0 IN CASE BAD SYMBOL...
LDA DGTCNT VALUE MUST BE < 100
CMP #3 SO MUST BE 1 OR 2 DIGITS
BCS .4 ...TOO MANY DIGITS, BAD SYMBOL
LDA SYM.VALUE
ORA #$80 BE SURE NOT 00
STA SYMBOL+8 SAVE VALUE
LDA CALL.NUM JUST IN CASE IT'S A
STA SYMBOL+9 MACRO PRIVATE LABEL
LDA CALL.NUM+1
STA SYMBOL+10
INX SIGNAL GOOD SYMBOL
BNE .4 ...ALWAYS
*--------------------------------
.3 JSR PACK.NAME
.4 JSR BACKUP.CHAR.PNTR
STX SYMBOL+6 SAVE LENGTH
CPX #1 CARRY SET IF AT LEAST ONE CHAR
LDX #0 CLEAR X AGAIN
RTS
*--------------------------------
* PACK A NAME INTO SYMBOL
*--------------------------------
PACK.NAME
JSR CHECK.LETTER
BCC .4 NOT A LETTER
.1 CPX #32 SEE IF ALREADY 32 CHARACTERS
BEQ .2 YES, IGNORE
STA SYMBOL+7,X PUT CHAR IN ENTRY
INX POINT AT NEXT SLOT
.2 JSR GNC.UC GET NEXT CHAR FROM LINE
JSR CHECK.DOT.DIGIT.OR.LETTER
BCS .1 VALID CHAR
.4 RTS END OF NAME
*--------------------------------
* SEARCH SYMBOL TABLE
* # OF CHARS STORED AT SYMBOL+6
* SYMBOL ITSELF AT SYMBOL+7 AND FOLLOWING
* JSR STSRCH
* IF FOUND: CARRY CLEAR
* (STPNTR)=ADDRESS OF ENTRY
* IF NOT FOUND: CARRY SET
* (STPNTR)=ADDRESS OF
* POINTER CELL WHICH
* SHOULD POINT AT ENTRY
*--------------------------------
STSRCH SEC CONVERT FIRST CHARACTER
LDA SYMBOL+7 OF SYMBOL TO HASH TABLE INDEX
CMP #CHR.PERIOD SEE IF LOCAL SYMBOL
BEQ .8 YES
CMP #': COLON, THEN PRIVATE LABEL
BNE .12 NO, NORMAL LABEL
JMP SEARCH.PRIVATE.LABELS
.12 SBC #$40 AT-SIGN
ASL DOUBLE INDEX, CLEAR CARRY
ADC #HSHTBL
STA STPNTR
LDA /HSHTBL
ADC #0
STA STPNTR+1
.1 LDY #0
>SYM LDA,STPNTR GET POINTER FROM ENTRY
STA TPTR
INY
>SYM LDA,STPNTR
BEQ .4 END OF CHAIN, NOT IN TABLE
STA TPTR+1
LDX SYMBOL+6 # CHARS IN SYMBOL
LDY #6 POINT AT LENGTH
>SYM LDA,TPTR USE MINIMUM LENGTH
AND #$3F ISOLATE LENGTH
CMP SYMBOL,Y
INY
BCS .2
TAX
.2 >SYM LDA,TPTR COMPARE BYTES FROM BOTH
AND #$7F ALLOW FLAG BITS IN SYMBOL
CMP SYMBOL,Y
BCC .3 NOT THIS ONE, BUT KEEP LOOKING
BNE .4 NOT IN THIS CHAIN
DEX
BEQ .5 THE NAME IS THE SAME OR A SUBSET
INY NEXT BYTE PAIR
BNE .2 ...ALWAYS
.3 JSR .7 UPDATE POINTER, CLEAR CARRY
BCC .1 ...ALWAYS
.4 SEC DID NOT FIND
LDX #0 RESTORE X=0
RTS
.5 LDY #6 TEST LENGTHS
>SYM LDA,TPTR
AND #$3F ISOLATE LENGTH
CMP SYMBOL+6 # CHARS IN SYMBOL IN TABLE
BEQ .6 SAME EXACTLY
BCS .4 NEW SYMBOL IS SHORTER
BCC .3 NEW SYMBOL IS LONGER
.6 LDY #2 POINT AT VALUE
.65 >SYM LDA,TPTR SET UP VALUE FOR EXPR SCAN
STA SYM.VALUE-2,Y
INY
CPY #6
BCC .65
.7 LDA TPTR
STA STPNTR
LDA TPTR+1
STA STPNTR+1
CLC SIGNAL DID FIND IT
RTS
*--------------------------------
.8 LDA CURRENT.MAJOR.LABEL
STA STPNTR
LDA CURRENT.MAJOR.LABEL+1
BEQ .11
STA STPNTR+1
CLC
LDY #6 POINT AT LENGTH
>SYM LDA,STPNTR GET LENGTH OF MAJOR SYMBOL
BPL .4 NO LOCAL SYMBOLS YET
AND #$3F MASK TO REAL LENGTH
ADC #7 POINT AT LOCALS
TAY
.9 >SYM LDA,STPNTR
BEQ .4 END OF LOCALS, NOT FOUND
CMP SYMBOL+8 COMPARE TO NAME OF LOCAL
BEQ .10 FOUND IT!
INY SKIP TO NEXT LOCAL
INY
BNE .9 ...ALWAYS
.10 INY POINT AT VALUE OFFSET
>SYM LDA,STPNTR
CLC
LDY #2 POINT AT MAJOR VALUE
>SYM ADC,STPNTR
STA SYM.VALUE
INY
>SYM LDA,STPNTR
ADC #0
STA SYM.VALUE+1
INY
>SYM LDA,STPNTR
ADC #0
STA SYM.VALUE+2
INY
>SYM LDA,STPNTR
ADC #0
STA SYM.VALUE+3
CLC
RTS
.11 LDY #QER9 NO NORMAL LABEL YET
JMP SOFT.ERROR
*--------------------------------
* SEARCH PRIVATE LABEL TABLE
*--------------------------------
SEARCH.PRIVATE.LABELS
LDA MACLBL
STA STPNTR
LDA MACLBL+1
.1 STA STPNTR+1
CMP LO.MEM+1 END OF TABLE YET?
BCS .3 ...YES, NO MORE LABELS
LDY #6
>SYM LDA,STPNTR
AND #$3F ISOLATE FROM FLAG BITS
CMP SYMBOL+10
BNE .2 NO
DEY
>SYM LDA,STPNTR
CMP SYMBOL+9
BNE .2 NO
DEY
>SYM LDA,STPNTR
CMP SYMBOL+8
BEQ .4 YES, FOUND IT!
.2 CLC BUMP PNTR TO NEXT LABEL
LDA STPNTR
ADC #7
STA STPNTR
LDA STPNTR+1
ADC #0
BNE .1 ...ALWAYS
*--------------------------------
.3 SEC SIGNAL NOT FOUND
RTS
*--------------------------------
.4 DEY
.5 >SYM LDA,STPNTR
STA SYM.VALUE,Y
DEY
BPL .5
CLC
RTS
*--------------------------------
* ADD SYMBOL TO TABLE
*--------------------------------
STADD LDA SYMBOL+7 SEE IF LOCAL SYMBOL
CMP #CHR.PERIOD
BEQ .5 YES
CMP #': COLON, PRIVATE LABEL
BNE .11 NO, NORMAL LABEL
JMP ADD.PRIVATE.LABEL
.11 LDY #1 POINT AT POINTER
.1 >SYM LDA,STPNTR GET CURRENT POINTER
STA SYMBOL,Y
LDA EOT,Y
>SYM STA,STPNTR
STA PNTR,Y
STA CURRENT.MAJOR.LABEL,Y
LDA ORGN,Y VALUE
STA SYMBOL+2,Y
LDA ORGN+2,Y
STA SYMBOL+4,Y
DEY
BPL .1
CLC COMPUTE ENTRY SIZE
LDA SYMBOL+6 FROM SYMBOL SIZE
ADC #7
.2 PHA SAVE SIZE
LDY EOT+1
CLC
ADC EOT SEE IF ROOM FOR NEW ENTRY
BCC .10
INY
.DO AUXMEM
.10 CPY /$C000
BCS .4 MEM FULL ERR
STA EOT
.ELSE
.10 CMP MACSTK
TAX SAVE LOW BYTE
TYA GET HIGH BYTE
SBC MACSTK+1
BCS .4 MEM FULL ERR
STX EOT
.FIN
STY EOT+1
PLA GET SIZE
TAY
DEY CORRECT FOR INDEXING
.3 LDA SYMBOL,Y
>SYM STA,PNTR
DEY
BPL .3
RTS
.4 JMP MFER MEM FULL ERR
*--------------------------------
.5 LDY #6 LENGTH BYTE
>SYM LDA,STPNTR
BMI .6 ALREADY HAVE SOME LOCAL LABELS
ORA #$80 SET LOCAL FLAG
>SYM STA,STPNTR
BNE .8 ...ALWAYS
.6 LDA EOT BACK UP EOT
BNE .7 OVER 00 TERMINATOR
DEC EOT+1 OF LOCALS
.7 DEC EOT
.8 LDA SYMBOL+8 NAME OF LOCAL
STA SYMBOL SET UP TO ADD TO SYMBOL TABLE
SEC
LDY #1
JSR CALC.OFFSET.BYTE
JSR CALC.OFFSET.BYTE
BNE .9 ERROR > 255
JSR CALC.OFFSET.BYTE
BNE .9 ERROR > 255
JSR CALC.OFFSET.BYTE
BNE .9 ERROR > 255
LDA EOT
STA PNTR
LDA EOT+1
STA PNTR+1
LDA #3 SIZE IS 3 BYTES
BNE .2 ...ALWAYS
.9 JMP GT255ERR VALUE > 255
*--------------------------------
CALC.OFFSET.BYTE
INY
LDA ORGN-2,Y
>SYM SBC,STPNTR
STA SYMBOL-1,Y
RTS
*--------------------------------
* ADD A PRIVATE LABEL
*--------------------------------
ADD.PRIVATE.LABEL
SEC
LDA MACLBL
SBC #7
STA MACLBL
STA STPNTR
LDA MACLBL+1
SBC #0
STA MACLBL+1
STA STPNTR+1
CMP #8 BELOW $0800?
BCC .3 YES, NO MORE ROOM
LDY #6 POINT AT LAST BYTE
.1 LDA SYMBOL+4,Y
CPY #4
BCS .2
LDA ORGN,Y
.2 >SYM STA,STPNTR
DEY
BPL .1
RTS
.3 JMP MFER
*--------------------------------------
MAN
SAVE usr/src/scmasm.30/scmasm.s.symt
LOAD usr/src/scmasm.30/scmasm.s
ASM
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