Add 8-bit wraparound, make loops actually work
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Quinn Evans
parent
0c253dc34c
commit
3969cf49b8
96
BF-RUN.COB
96
BF-RUN.COB
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@ -13,7 +13,7 @@
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03 LOOP-STATE PIC 99 VALUE 0.
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88 DONE VALUE 99.
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01 BF-MEMORY.
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03 BF-CELL PIC S999
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03 BF-CELL PIC 999
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USAGE COMPUTATIONAL
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OCCURS 9999 TIMES
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INDEXED BY CURRENT-CELL.
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@ -32,6 +32,19 @@
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01 CONVERSION.
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03 CHAR-CODE PIC 999.
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03 COBOL-STRING PIC X(6).
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D01 DEBUG-DISPLAY.
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D 03 FILLER PIC XXX VALUE "IP.".
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D 03 DEBUG-IP PIC 9(3).
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D 03 FILLER PIC X VALUE ";".
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D 03 DEBUG-INSTRUCTION PIC X.
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D 03 FILLER PIC X(5) VALUE "CELL.".
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D 03 DEBUG-CURRENT-CELL PIC 999.
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D 03 FILLER PIC X(4) VALUE "VAL.".
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D 03 DEBUG-CELL PIC 999.
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D 03 FILLER PIC X VALUE "L".
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D 03 DEBUG-LOOP-DEPTH PIC 99.
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D 03 FILLER PIC X VALUE "C".
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D 03 DEBUG-CYCLES PIC 9(5).
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LINKAGE SECTION.
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01 BF-I-O.
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@ -54,6 +67,7 @@
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FROM 1 BY 1
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UNTIL CURRENT-CELL IS GREATER THAN 9999.
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SET CURRENT-CELL TO 1.
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D MOVE 1 TO DEBUG-CURRENT-CELL.
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PERFORM EXECUTE-INSTRUCTION
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UNTIL CYCLES IS GREATER THAN OR EQUAL TO CYCLE-LIMIT.
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EXIT PROGRAM.
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@ -67,54 +81,80 @@
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READ-INSTRUCTION.
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IF IP IS LESS THAN 512 THEN
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UNSTRING BF-CODE INTO CURRENT-INSTRUCTION WITH POINTER IP
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D DISPLAY CURRENT-INSTRUCTION
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ELSE
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MOVE 99 TO LOOP-STATE.
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EXECUTE-INSTRUCTION.
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MOVE 0 TO LOOP-STATE.
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D DISPLAY IP, BF-CELL(CURRENT-CELL), LOOP-DEPTH, CYCLES.
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PERFORM READ-INSTRUCTION.
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D MOVE IP TO DEBUG-IP.
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D MOVE CURRENT-INSTRUCTION TO DEBUG-INSTRUCTION.
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D MOVE BF-CELL(CURRENT-CELL) TO DEBUG-CELL.
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D MOVE LOOP-DEPTH TO DEBUG-LOOP-DEPTH.
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D MOVE CYCLES TO DEBUG-CYCLES.
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D DISPLAY DEBUG-DISPLAY.
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IF DONE THEN
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D DISPLAY "GOING TO HELL"
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GO TO HELL.
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IF BF-LEFT THEN
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PERFORM DO-LEFT
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ELSE IF BF-RIGHT THEN
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MOVE 99 TO LOOP-STATE
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ELSE IF BF-RIGHT AND NOT DONE THEN
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PERFORM DO-RIGHT
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ELSE IF BF-DEC THEN
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MOVE 99 TO LOOP-STATE
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ELSE IF BF-DEC AND NOT DONE THEN
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PERFORM DO-DEC
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ELSE IF BF-INC THEN
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MOVE 99 TO LOOP-STATE
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ELSE IF BF-INC AND NOT DONE THEN
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PERFORM DO-INC
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ELSE IF BF-OUT THEN
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MOVE 99 TO LOOP-STATE
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ELSE IF BF-OUT AND NOT DONE THEN
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PERFORM DO-OUT
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ELSE IF BF-IN THEN
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MOVE 99 TO LOOP-STATE
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ELSE IF BF-IN AND NOT DONE THEN
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PERFORM DO-IN
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ELSE IF BF-BEGIN THEN
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MOVE 99 TO LOOP-STATE
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ELSE IF BF-BEGIN AND NOT DONE THEN
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PERFORM DO-BEGIN
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ELSE IF BF-END THEN
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MOVE 99 TO LOOP-STATE
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ELSE IF BF-END AND NOT DONE THEN
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PERFORM DO-END
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ELSE IF BF-DIE THEN
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MOVE 99 TO LOOP-STATE
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ELSE IF BF-DIE AND NOT DONE THEN
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GO TO HELL.
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ADD 1 TO CYCLES.
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DO-LEFT.
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IF CURRENT-CELL IS GREATER THAN 1 THEN
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SET CURRENT-CELL DOWN BY 1
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D SUBTRACT 1 FROM DEBUG-CURRENT-CELL
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ELSE
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D MOVE 9999 TO DEBUG-CURRENT-CELL
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SET CURRENT-CELL TO 9999.
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MOVE 99 TO LOOP-STATE.
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DO-RIGHT.
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IF CURRENT-CELL IS LESS THAN 9999 THEN
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SET CURRENT-CELL UP BY 1
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D ADD 1 TO DEBUG-CURRENT-CELL
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ELSE
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D MOVE 1 TO DEBUG-CURRENT-CELL
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SET CURRENT-CELL TO 1.
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MOVE 99 TO LOOP-STATE.
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DO-DEC.
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SUBTRACT 1 FROM BF-CELL(CURRENT-CELL).
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IF BF-CELL(CURRENT-CELL) > 0 THEN
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SUBTRACT 1 FROM BF-CELL(CURRENT-CELL)
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ELSE
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MOVE 255 TO BF-CELL(CURRENT-CELL).
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MOVE 99 TO LOOP-STATE.
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DO-INC.
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ADD 1 TO BF-CELL(CURRENT-CELL).
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IF BF-CELL(CURRENT-CELL) < 255 THEN
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ADD 1 TO BF-CELL(CURRENT-CELL)
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ELSE
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MOVE 0 TO BF-CELL(CURRENT-CELL).
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MOVE 99 TO LOOP-STATE.
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DO-OUT.
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IF OUT-PTR < 505 THEN
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@ -130,6 +170,7 @@
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D DISPLAY "OUT", I-O-CHARACTER, BF-CELL(CURRENT-CELL)
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ELSE
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GO TO HELL.
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MOVE 99 TO LOOP-STATE.
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DO-IN.
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UNSTRING BF-INPUT,
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@ -154,46 +195,53 @@
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CALL "ENCODE-ASCII" USING CONVERSION.
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MOVE CHAR-CODE TO BF-CELL(CURRENT-CELL).
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D DISPLAY "IN", I-O-CHARACTER, BF-CELL(CURRENT-CELL).
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MOVE 99 TO LOOP-STATE.
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DO-BEGIN.
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IF BF-CELL(CURRENT-CELL) IS EQUAL TO 0 THEN
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MOVE LOOP-DEPTH TO LOOP-WORK
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ADD 1 TO LOOP-WORK
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PERFORM FIND-END UNTIL DONE
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SUBTRACT 1 FROM IP
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ELSE
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ADD 1 TO LOOP-DEPTH.
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MOVE 99 TO LOOP-STATE.
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FIND-END.
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FIND-END.
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D DISPLAY "ENTERED FIND-END."
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PERFORM READ-INSTRUCTION.
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IF NOT DONE THEN
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IF BF-BEGIN THEN
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ADD 1 TO LOOP-WORK
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ELSE IF BF-END THEN
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D DISPLAY "FOUND END."
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SUBTRACT 1 FROM LOOP-WORK
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IF LOOP-WORK EQUALS LOOP-DEPTH THEN
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MOVE 99 TO LOOP-STATE
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ELSE
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SUBTRACT 1 FROM LOOP-WORK.
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MOVE 99 TO LOOP-STATE.
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D DISPLAY "FIND-END.", IP, ";", CURRENT-INSTRUCTION,
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D "LD", LOOP-DEPTH, "LW", LOOP-WORK.
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DO-END.
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SUBTRACT 1 FROM LOOP-DEPTH.
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IF BF-CELL(CURRENT-CELL) IS NOT EQUAL TO 0 THEN
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MOVE LOOP-DEPTH TO LOOP-WORK
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PERFORM FIND-BEGIN UNTIL DONE.
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PERFORM FIND-BEGIN UNTIL DONE
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ADD 1 TO IP.
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MOVE 99 TO LOOP-STATE.
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FIND-BEGIN.
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PERFORM UNREAD-INSTRUCTION.
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IF NOT DONE THEN
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IF BF-END THEN
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SUBTRACT 1 FROM LOOP-WORK
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ADD 1 TO LOOP-WORK
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ELSE IF BF-BEGIN THEN
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SUBTRACT 1 FROM LOOP-WORK
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IF LOOP-WORK EQUALS LOOP-DEPTH THEN
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MOVE 99 TO LOOP-STATE
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ELSE
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ADD 1 TO LOOP-WORK.
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MOVE 99 TO LOOP-STATE.
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UNREAD-INSTRUCTION.
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UNSTRING BF-CODE INTO CURRENT-INSTRUCTION WITH POINTER IP.
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IF IP IS GREATER THAN 3 THEN
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SUBTRACT 2 FROM IP
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UNSTRING BF-CODE INTO CURRENT-INSTRUCTION WITH POINTER IP
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ELSE
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MOVE 1 TO IP
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MOVE 99 TO LOOP-STATE.
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