MPL Bytecode Compiler Code

{ MPL - MICRO PROGRAMMING LANGUAGE / COPYRIGHT (C) 2017-2018 DEREK JOHN EVANS }

{$IFDEF FPC}{$MODE TP}{$S-}{$ENDIF}
{$IFDEF HPC}{$M 8,48,48,16}{$F+}{$S-}{$ENDIF}
{$IFNDEF HPC}{$A-}{$ENDIF}
{$D-}{$I-}{$R-}{$V-}

PROGRAM MPL;

{$I MPL.INC}

CONST INCDIR = {$IFDEF HPC}'M:\MPL\'{$ELSE}''{$ENDIF};

TYPE

  TERR = (ESYN, EDUP, ENOT);
  TTYP = (ISNO, IS2P, ISDM, ISID, ISSH, ISCP, ISEQ, ISBT, ISLG, ISFN);

  TGLO = PACKED RECORD
    M: TPRG; E: INTEGER;
    A: PACKED RECORD S: STR127; O: TOPR; T: TTYP; I: INTEGER END;
    S: PACKED RECORD S: TSYM; N: INTEGER; T: PACKED ARRAY[BYTE] OF VINTEGER END
  END;

VAR G: ^TGLO; GF: ^TEXT; GC: CHAR;

PROCEDURE WERR(E: TERR); BEGIN G^.E := G^.E + 1; WRITE('!ERR!: ');
  CASE E OF
    ESYN: WRITE('SYNTAX'); EDUP: WRITE('DUPLICATE'); ENOT: WRITE('NOT FOUND')
  END; WRITELN('? "', G^.A.S, '"')
END;

FUNCTION FIND(VAR OUT: INTEGER): BOOLEAN; VAR S: TSYM; BEGIN
  OUT := 0; FIND := FALSE;
  IF G^.A.O <> XLDNEG THEN WERR(ESYN)
  ELSE BEGIN OUT := G^.S.N; S := G^.S.S;
    WHILE LENGTH(S.P^) <> 0 DO BEGIN
      IF S.P^[0] = G^.A.S[0] THEN IF S.P^ = G^.A.S THEN BEGIN
        FIND := TRUE; EXIT
      END;
      OUT := OUT - 1; S.I := S.I + LENGTH(S.P^) + 1
    END
  END
END;

FUNCTION SREG: INTEGER; VAR I: INTEGER; BEGIN
  IF FIND(I) THEN SREG := I
  ELSE BEGIN G^.S.S.I := G^.S.S.I - LENGTH(G^.A.S) - 1;
    G^.S.S.P^ := G^.A.S; G^.S.N := G^.S.N + 1; SREG := G^.S.N
  END
END;

PROCEDURE GBYT(I: INTEGER);
BEGIN G^.M.B[G^.M.N].V := I; G^.M.N := G^.M.N + 1 END;

PROCEDURE GINT(I: INTEGER);
BEGIN MOVE(I, G^.M.B[G^.M.N], 2); G^.M.N := G^.M.N + 2 END;

PROCEDURE GOPR(O: TOPR);
BEGIN G^.M.B[G^.M.N].V := ORD(O); G^.M.N := G^.M.N + 1 END;

PROCEDURE GOP1(O: TOPR; I: INTEGER); BEGIN GOPR(O); GBYT(I) END;
PROCEDURE GOP2(O: TOPR; I: INTEGER); BEGIN GOPR(O); GINT(I) END;

PROCEDURE GO12(O1, O2: TOPR; I: INTEGER);
BEGIN IF I = SEX(I) THEN GOP1(O1, I) ELSE GOP2(O2, I) END;

PROCEDURE GO2A(O: TOPR; I, A: INTEGER); VAR N: INTEGER;
BEGIN N := G^.M.N; G^.M.N := A; GOP2(O, I); G^.M.N := N END;

PROCEDURE LIME(I: INTEGER); VAR J: INTEGER; BEGIN J := I + 128;
  IF (J >= ORD(XZZZ)) AND (J <= 255) THEN GBYT(J)
  ELSE GO12(XIMCHR, XIMINT, I)
END;

PROCEDURE LEAD(PC: INTEGER);
BEGIN IF PC >= 0 THEN LIME(PC) ELSE GO12(XLEAD1, XLEAD2, -PC) END;

PROCEDURE GARG; VAR S: TSYM; BEGIN S.A := ADDR(G^.M.B[G^.M.N]);
  S.P^ := G^.A.S; G^.M.N := G^.M.N + LENGTH(G^.A.S) + 1
END;

PROCEDURE RDCH; BEGIN IF GC <> CHR(0) THEN GC := FREADC(GF^) END;

FUNCTION META: CHAR; BEGIN
  IF GC = '*' THEN BEGIN RDCH;
    CASE UPCASE(GC) OF
      '0': GC := CHR( 0); 'A': GC := CHR( 7); 'B': GC := CHR( 8);
      'T': GC := CHR( 9); 'N': GC := CHR(10); 'V': GC := CHR(11);
      'P': GC := CHR(12); 'C': GC := CHR(13); 'S': GC := CHR(32)
    END
  END; META := GC
END;

PROCEDURE G1(T: TTYP; O: TOPR); BEGIN G^.A.T := T; G^.A.O := O END;
PROCEDURE G2(T: TTYP; O: TOPR); BEGIN G^.A.T := T; G^.A.O := O; RDCH END;

PROCEDURE NEXT; LABEL LOOP; BEGIN
  LOOP: WHILE GC IN [CHR(1)..CHR(32)] DO RDCH;
  G1(ISNO, XABORT); GC := UPCASE(GC); G^.A.S := GC;
  IF GC IN ['.', 'A'..'Z'] THEN BEGIN RDCH; GC := UPCASE(GC);
    WHILE GC IN ['.', 'A'..'Z', '0'..'9'] DO BEGIN
      G^.A.S := G^.A.S + GC; RDCH; GC := UPCASE(GC)
    END; G^.A.O := XLDNEG
  END ELSE IF GC IN  ['0'..'9'] THEN BEGIN
    G^.A.I := ORD(GC) - ORD('0'); RDCH;
    WHILE GC IN ['0'..'9'] DO BEGIN
      G^.A.I := G^.A.I * 10 + ORD(GC) - ORD('0'); RDCH
    END; G^.A.O := XIMINT
  END ELSE BEGIN RDCH;
    CASE G^.A.S[1] OF
      '''': BEGIN G^.A.I := ORD(META); RDCH;
        IF GC = '''' THEN BEGIN RDCH; G^.A.O := XIMINT END
      END;
      '"': BEGIN G^.A.S[0] := CHR(0);
        WHILE NOT (GC IN [CHR(0), '"']) DO BEGIN
          G^.A.S := G^.A.S + META; RDCH
        END; IF GC = '"' THEN BEGIN G^.A.O := XIMSTR; RDCH END
      END;
      '/': CASE GC OF
        '/': BEGIN WHILE NOT (GC IN [CHR(0), CHR(10)]) DO RDCH; GOTO LOOP END;
        '*': BEGIN RDCH;
          REPEAT WHILE NOT (GC IN [CHR(0), '*']) DO RDCH;
            RDCH UNTIL GC IN [CHR(0), '/']; RDCH; GOTO LOOP
        END;
        '=': G2(IS2P, X2PDIV) ELSE G1(ISDM, XDMDIV)
      END;
      '?': G^.A.O := XIFEQU; '@': G^.A.O := XIFNEQ;
      ';': G^.A.O := XIFNOW; ',': G^.A.O := XFNJMP;
      '(': G^.A.O := XFNBEG; ')': G^.A.O := XFNEND;
      '[': G^.A.O := XPUSHA; ']': G^.A.O := XPULLA;
      '$': G^.A.O := XLEAD2; '%': G^.A.O := XLDBYT;
      '!': IF GC = '=' THEN G2(ISEQ, XEQNOT) ELSE G^.A.O := XLDINT;
      '^': IF GC = '=' THEN G2(IS2P, X2PXOR) ELSE G1(ISBT, XBTXOR);
      '*': IF GC = '=' THEN G2(IS2P, X2PMUL) ELSE G1(ISDM, XDMMUL);
      '#': IF GC = '=' THEN G2(IS2P, X2PMOD) ELSE G1(ISDM, XDMMOD);
      '=': IF GC = '=' THEN G2(ISEQ, XEQYES) ELSE G1(IS2P, X2PSET);
      '+': CASE GC OF '+': G2(ISNO, XAPINC); '=': G2(IS2P, X2PADD);
        ELSE G1(ISID, XIDADD) END;
      '-': CASE GC OF '-': G2(ISNO, XAPDEC); '=': G2(IS2P, X2PSUB);
        ELSE G1(ISID, XIDSUB) END;
      '<': CASE GC OF '<': G2(ISSH, XSHSHL); '=': G2(ISCP, XCPLTE);
        ELSE G1(ISCP, XCPLTH) END;
      '>': CASE GC OF '>': G2(ISSH, XSHSHR); '=': G2(ISCP, XCPGTE);
        ELSE G1(ISCP, XCPGTH) END;
      ':': CASE GC OF ':': G2(ISLG, XLGIOR); '=': G2(IS2P, X2PIOR);
        ELSE G1(ISBT, XBTIOR) END;
      '&': CASE GC OF '&': G2(ISLG, XLGAND); '=': G2(IS2P, X2PAND)
        ELSE G1(ISBT, XBTAND) END
    END
  END;
END;

FUNCTION ISO(O: TOPR): BOOLEAN; BEGIN
  IF G^.A.O = O THEN BEGIN NEXT; ISO := TRUE END ELSE ISO := FALSE
END;

FUNCTION IST(T: TTYP; VAR O: TOPR): BOOLEAN; BEGIN O := G^.A.O;
  IF G^.A.T = T THEN BEGIN NEXT; IST := TRUE END ELSE IST := FALSE
END;

FUNCTION SIGN: INTEGER; VAR I: INTEGER; O: TOPR; BEGIN I := 1;
  WHILE IST(ISID, O) DO IF O = XIDSUB THEN I := -I; SIGN := I
END;

FUNCTION NUMB: INTEGER; VAR I, J: INTEGER; BEGIN J := SIGN;
  IF G^.A.O = XIMINT THEN BEGIN I := G^.A.I; NEXT END
  ELSE BEGIN IF NOT FIND(I) THEN WERR(ENOT);
    WITH G^.S.T[I] DO BEGIN
      IF G^.A.S[1] = '.' THEN BEGIN NEXT; I := V END
      ELSE BEGIN NEXT;
        IF ISO(XLEAD2) THEN I := V ELSE I := G^.M.I[V SHR 1].V
      END
    END
  END; NUMB := I * J
END;

FUNCTION X2X1(O: TOPR): TOPR; BEGIN
  CASE O OF
    X2PADD: O := X1PADD; X2PAND: O := X1PAND; X2PDIV: O := X1PDIV;
    X2PIOR: O := X1PIOR; X2PMUL: O := X1PMUL; X2PSET: O := X1PSET;
    X2PSHL: O := X1PSHL; X2PSHR: O := X1PSHR; X2PSUB: O := X1PSUB;
    X2PXOR: O := X1PXOR; X2PMOD: O := X1PMOD
  END; X2X1 := O
END;

PROCEDURE EXPR; FORWARD;

PROCEDURE ASSN(OK: BOOLEAN);
VAR I, J: INTEGER; O: TOPR; ISI, IID: BOOLEAN; LABEL LOOP;
BEGIN J := SIGN;
  CASE G^.A.O OF
    X2PSET: BEGIN NEXT; EXPR; GOPR(XFNEND) END;
    XFNBEG: BEGIN NEXT; EXPR; IF NOT ISO(XFNEND) THEN WERR(ESYN) END;
    XIFNEQ: BEGIN NEXT; I := G^.M.N; EXPR; GOP2(XIFNEQ, I) END;
    XIMINT: BEGIN LIME(G^.A.I * J); J := 1; NEXT END;
    XIMSTR: BEGIN GOPR(XIMSTR); GARG; NEXT END;
    XLDBYT, XLDINT: BEGIN ISI := G^.A.O = XLDINT; NEXT; ASSN(FALSE);
      IF OK AND (G^.A.T = IS2P) THEN BEGIN
        IF ISI THEN O := G^.A.O ELSE O := X2X1(G^.A.O);
        GOPR(XPUSHA); NEXT; EXPR; GOPR(O)
      END ELSE IF ISI THEN GOPR(XLDINT) ELSE GOPR(XLDBYT)
    END ELSE BEGIN O := G^.A.O; IID := O IN [XAPINC, XAPDEC]; IF IID THEN NEXT;
      IF NOT FIND(I) THEN WERR(ENOT);
      WITH G^.S.T[I] DO BEGIN
        IF G^.A.S[1] = '.' THEN BEGIN IF IID THEN WERR(ESYN); LIME(V); NEXT; END
        ELSE BEGIN LEAD(V); NEXT;
          IF IID THEN GOPR(O) ELSE IF OK AND (G^.A.T = IS2P) THEN BEGIN
            O := G^.A.O; GOPR(XPUSHA); NEXT; EXPR; GOPR(O)
          END ELSE CASE G^.A.O OF
            XAPINC: BEGIN GOPR(XAPINP); NEXT END;
            XAPDEC: BEGIN GOPR(XAPDEP); NEXT END;
            XLEAD2: BEGIN NEXT END ELSE GOPR(XAPGET)
          END
        END
      END
    END
  END;
LOOP: CASE G^.A.O OF
    XLDBYT, XLDINT: BEGIN
      ISI := G^.A.O = XLDINT; NEXT; GOPR(XPUSHA); ASSN(FALSE);
      IF OK AND (G^.A.T = IS2P) THEN BEGIN
        IF ISI THEN BEGIN O := G^.A.O; NEXT; GOPR(XINCA2) END
        ELSE BEGIN O := X2X1(G^.A.O); NEXT; GOPR(XINCA1) END; EXPR; GOPR(O)
      END ELSE IF ISI THEN GOPR(XPEINT) ELSE GOPR(XPEBYT);
      GOTO LOOP
    END;
    XFNBEG: BEGIN NEXT; GOPR(XPUSHA); I := 1;
      IF G^.A.O <> XFNEND THEN REPEAT EXPR; GOPR(XPUSHA); I := I + 1
      UNTIL NOT ISO(XFNJMP); LIME(I); GOPR(XFNJMP);
      IF NOT ISO(XFNEND) THEN WERR(ESYN); GOTO LOOP
    END
  END; IF J < 0 THEN GOPR(XLDNEG)
END;

PROCEDURE OPER(T: TTYP); VAR O: TOPR; BEGIN
  IF T = IS2P THEN ASSN(TRUE) ELSE BEGIN OPER(PRED(T));
    WHILE IST(T, O) DO BEGIN GOPR(XPUSHA); OPER(PRED(T)); GOPR(O) END;
  END
END;

PROCEDURE EXPR; VAR PEXP, PNOW, PEQU: INTEGER; BEGIN
  PEXP := G^.M.N;
  IF G^.A.O = XPUSHA THEN BEGIN
    NEXT; REPEAT EXPR UNTIL NOT ISO(XIFNOW);
    IF NOT ISO(XPULLA) THEN WERR(ESYN)
  END ELSE OPER(ISFN);
  CASE G^.A.O OF
    XIFNEQ: BEGIN NEXT; PEQU := G^.M.N; GOP2(XIFEQU, 0); EXPR;
      GOP2(XIFNOW, PEXP); GO2A(XIFEQU, G^.M.N, PEQU)
    END;
    XIFEQU: BEGIN NEXT; PEQU := G^.M.N; GOP2(XIFEQU, 0); EXPR;
      IF G^.A.O = XFNJMP THEN BEGIN NEXT; PNOW := G^.M.N; GOP2(XIFNOW, 0);
        GO2A(XIFEQU, G^.M.N, PEQU); EXPR; GO2A(XIFNOW, G^.M.N, PNOW)
      END ELSE GO2A(XIFEQU, G^.M.N, PEQU)
    END
  END
END;

PROCEDURE COMP; FORWARD;

PROCEDURE BODY; VAR I, N: INTEGER; S: TSYM; BEGIN
  WHILE (G^.A.O <> XABORT) AND (G^.E < 1) DO BEGIN
    IF G^.A.O = XIDADD THEN BEGIN NEXT; COMP; NEXT
    END ELSE BEGIN IF ODD(G^.M.N) THEN G^.M.N := G^.M.N + 1;
      WITH G^.S.T[SREG] DO BEGIN WRITELN(G^.M.N: 5, ': ', G^.A.S);
        NEXT; IF V <> 0 THEN IF ISO(XLEAD2) THEN
          G^.M.I[V SHR 1].V := G^.M.N ELSE WERR(EDUP);
        CASE G^.A.O OF
          XBTIOR: BEGIN NEXT; V := NUMB END;
          X2PSET: BEGIN NEXT; IF V = 0 THEN V := G^.M.N;
            REPEAT
              IF G^.A.O = XIMSTR THEN BEGIN GARG; NEXT; END
              ELSE IF ISO(XLDBYT) THEN G^.M.N := G^.M.N + NUMB
              ELSE IF ISO(XLDINT) THEN G^.M.N := G^.M.N + NUMB * 2
              ELSE GINT(NUMB)
            UNTIL NOT ISO(XFNJMP)
          END;
          XFNBEG: BEGIN
            NEXT; IF V = 0 THEN BEGIN V := G^.M.N; GINT(V + 2) END;
            S := G^.S.S; N := G^.S.N; I := 1;
            IF G^.A.O <> XFNEND THEN REPEAT
              REPEAT IF G^.A.O <> XIFNOW THEN WITH G^.S.T[SREG] DO BEGIN
                  IF V <> 0 THEN WERR(EDUP);
                  IF G^.A.S[1] = '.' THEN WERR(ESYN);
                  NEXT; V := -I;
                  IF ISO(XLDINT) THEN I := I + NUMB
                  ELSE IF ISO(XLDBYT) THEN I := I + (NUMB + 1) DIV 2
                  ELSE I := I + 1
                END
              UNTIL NOT ISO(XFNJMP)
            UNTIL NOT ISO(XIFNOW);
            IF NOT ISO(XFNEND) THEN WERR(ESYN);
            GOP1(XFNBEG, I); EXPR; GOPR(XFNEND);
            FOR I := N + 1 TO G^.S.N DO G^.S.T[I].V := 0;
            G^.S.S := S; G^.S.N := N
          END
        END
      END
    END
  END
END;

PROCEDURE COMP; VAR F: TEXT; TF: ^TEXT; TC: CHAR; BEGIN G^.A.O := XLDNEG;
  WITH G^.S.T[SREG] DO IF V = 0 THEN BEGIN
    WRITELN('+FILE: ', G^.A.S); V := 1; G^.A.S := INCDIR + G^.A.S + '.MPL';
    IF FOPEN(F, G^.A.S) <> 0 THEN BEGIN DELETE(G^.A.S, 1, LENGTH(INCDIR));
      IF FOPEN(F, G^.A.S) <> 0 THEN BEGIN WERR(ENOT); EXIT END
    END;
    TF := GF; TC := GC; GF := ADDR(F); GC := CHR(32); NEXT; BODY;
    GF := TF; GC := TC; CLOSE(F) (* BUG: MUST REMOVE CLOSE() FOR AMIGA HSPASCAL (?) *)
  END
END;

PROCEDURE MAIN; VAR F: FILE; I: INTEGER; BEGIN
  IF ARGC < 1 THEN WRITELN('USAGE: MPL <FILE>')
  ELSE BEGIN
    NEW(G); FILLCHAR(G^, SIZEOF(G^), 0); ARGV(G^.A.S, 1);
    G^.S.S.A := ADDR(G^.M.B[MPLMAX]); G^.M.N := 4; G^.A.O := XLDNEG;
    WRITELN; WRITELN('COMPILING'); WRITELN;
    COMP; IF G^.E = 0 THEN BEGIN G^.A.S := 'MAIN'; G^.A.O := XLDNEG;
      IF NOT FIND(I) THEN WERR(ENOT) ELSE WITH G^.S.T[I] DO BEGIN G^.M.P := G^.M.N;
        LEAD(V); GOPR(XAPGET); GOPR(XPUSHA); LIME(1); GOPR(XFNJMP); GOPR(XABORT)
      END
    END;
    WRITELN; WRITELN(G^.E  : 5, ' ERRORS'); WRITELN(G^.S.N: 5, ' SYMBOLS');
    WRITELN(G^.M.N: 5, ' BYTES'); WRITELN;
    IF G^.E = 0 THEN BEGIN
      ARGV(G^.A.S, 1); ASSIGN(F, G^.A.S + '.MPX'); REWRITE(F);
      IF IORESULT = 0 THEN BEGIN
        BLOCKWRITE(F, G^.M.B, {$IFDEF HPC}G^.M.N{$ELSE}
          (G^.M.N + 127) DIV 128{$ENDIF});
        CLOSE(F); WRITELN('COMPLETE')
      END
    END
  END
END;

{$IFDEF FPC}
PROCEDURE GDEF(FN: STR127); VAR T: TEXT; C: TCMD;
  PROCEDURE WRV(S: STR127; I: INTEGER); BEGIN WRITELN(T, '.', S,':',I) END;
BEGIN
  IF FCREATE(T, FN)=0 THEN BEGIN WRITELN(T, '// AUTO GENERATED LIBDEF');
    WRV('FALSE', 0);        WRV('TRUE', 1);
    WRV('INT', 2);          WRV('REAL', 6);
    WRV('LONG', 4);         WRV('NULL', 0);
    WRV('NEXT', 0);         WRV('PREV', 1);
    WRV('FINP', ORD(FINP)); WRV('FOUT', ORD(FOUT));
    WRV('FMIN', ORD(FMIN)); WRV('FMAX', ORD(FMAX));
    WRV('STRING', 128);
    FOR C := CABORT TO CTWRITES DO BEGIN
      STR(C,FN); DELETE(FN, 1, 1); WRV(FN,-ORD(C));
    END;
    FCLOSE(T)
  END
END;
{$ENDIF}

BEGIN
  {$IFDEF FPC}GDEF('LIBDEF.MPL');{$ENDIF}
  MAIN;
  {$IFDEF FPC}READLN;{$ENDIF}
END.