mirror of
https://github.com/DoctorWkt/pdp7-unix.git
synced 2026-01-24 19:33:02 +00:00
f36928ff9f
Very preliminary B compiler. Only able to compile hello.b and not tested further. This is implemented in a subset of C that will hopefully ease porting itself to B.
895 lines
15 KiB
C
895 lines
15 KiB
C
// b.c - B compiler for PDP-7 Unix
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//
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// Implemented in a subset of the C language compatible with B.
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// Coding style and organization based on lastc1120c.c
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//
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// (C) 2016 Robert Swierczek, GPL3
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//
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// Just enough working to compile hello.b:
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// gcc -m32 -Wno-multichar b.c -o b
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// ./b hello.b hello.s
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// perl as7 --out a.out bl.s hello.s bi.s
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// perl a7out a.out
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#ifdef _WIN32
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#include <io.h>
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#else
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#include <unistd.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <memory.h>
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#include <fcntl.h>
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#define eof xeof
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int fin = 0;
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int fout = 1;
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int symtab[500] = { /* , type = 1, value = 1, name = 4 */
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1, 5,0,0,'a','u','t','o',0,
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1, 6,0,0,'e','x','t','r','n',0,
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1,10,0,0,'g','o','t','o',0,
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1,11,0,0,'r','e','t','u','r','n',0,
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1,12,0,0,'i','f',0,
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1,13,0,0,'w','h','i','l','e',0,
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1,14,0,0,'e','l','s','e',0,
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0
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};
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int ctab[] = {
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0,127,127,127, 0,127,127,127, /* NUL SOH STX ETX EOT ENQ ACK BEL */
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127,126,126,127,127,127,127,127, /* BS TAB LF VT FF CR SO SI */
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127,127,127,127,127,127,127,127, /* DLE DC1 DC2 DC3 DC4 NAK SYN ETB */
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127,127,127,127,127,127,127,127, /* CAN EM SUB ESC FS GS RS US */
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126, 34,122,127,127, 44, 47,121, /* SPC ! " # $ % & ' */
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6, 7, 42, 40, 9, 41,127, 43, /* ( ) * + , - . / */
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124,124,124,124,124,124,124,124, /* 0 1 2 3 4 5 6 7 */
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124,124, 8, 1, 63, 80, 65, 90, /* 8 9 : ; < = > ? */
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127,123,123,123,123,123,123,123, /* @ A B C D E F G */
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123,123,123,123,123,123,123,123, /* H I J K L M N O */
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123,123,123,123,123,123,123,123, /* P Q R S T U V W */
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123,123,123, 4,127, 5, 48,127, /* X Y Z [ \ ] ^ _ */
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127,123,123,123,123,123,123,123, /* ` a b c d e f g */
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123,123,123,123,123,123,123,123, /* h i j k l m n o */
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123,123,123,123,123,123,123,123, /* p q r s t u v w */
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123,123,123, 2, 48, 3,127,127, /* x y z { | } ~ DEL */
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};
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/* storage */
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int symbuf[10];
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int peeksym = -1;
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int peekc = 0;
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int eof = 0;
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int line = 1;
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int *csym = 0;
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int cval = 0;
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int isn = 1;
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int nerror = 0;
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int main(int argc, char **argv) {
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if (argc > 1) {
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if (argc > 2) {
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if ((fout = creat(argv[2], 0777))<0) {
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error('fo');
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exit(1);
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}
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}
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if ((fin = open(argv[1],0))<0) {
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error('fi');
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exit(1);
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}
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}
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while (!eof) {
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extdef();
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// blkend();
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}
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xflush();
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exit(nerror);
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}
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int *lookup() {
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int *np, *sp, *rp;
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rp = symtab;
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while (*rp) {
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np = rp + 4;
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sp = symbuf;
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while (*np==*sp) {
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if (!*np)
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return rp;
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np = np + 1;
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sp = sp + 1;
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}
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while (*np)
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np = np + 1;
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rp = np + 1;
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}
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sp = symbuf;
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np = rp + 4;
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if (np >= symtab + 490) {
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error("sf");
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exit(1);
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}
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loop:
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*np = *sp;
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np = np + 1;
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sp = sp + 1;
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if (*sp)
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goto loop;
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*np = 0;
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return rp;
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}
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symbol() {
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// extern peeksym, peekc, eof, xread, subseq, error, line;
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// extern *csym, symbuf[], namsiz, lookup[], ctab, cval;
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// auto b, c, ct;
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// char symbuf[], sp[], ctab[];
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int b, c, ct;
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int *sp;
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if (peeksym>=0) {
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c = peeksym;
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peeksym = -1;
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return(c);
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}
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if (peekc) {
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c = peekc;
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peekc = 0;
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} else {
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if (eof)
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return(0);
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else
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c = xread();
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}
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loop:
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ct = ctab[c];
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if (ct==0) { /* EOT */
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eof++;
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return(0);
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}
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if (ct==126) { /* white space */
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if (c=='\n') /* newline */
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line = line + 1;
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c = xread();
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goto loop;
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}
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if (c=='=') {
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return(subseq('=',80,60));
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}
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if (c=='<') {
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return(subseq('=',63,62));
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}
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if (c=='>') {
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return(subseq('=',65,64));
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}
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if (c=='!') {
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return(subseq('=',34,61));
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}
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if (c=='$') {
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if (subseq('(',0,1))
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return(2);
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if (subseq(')',0,1))
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return(3);
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}
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if (c=='/') {
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if (subseq('*',1,0))
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return(43);
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com:
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c = xread();
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com1:
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if (c==4) {
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eof++;
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error('*/'); /* end of text */
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return(0);
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}
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if (c=='\n')
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line++;
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if (c!='*')
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goto com;
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c = xread();
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if (c!='/')
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goto com1;
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c = xread();
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goto loop;
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}
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if (ct==124) { /* number */
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cval = 0;
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if (c=='0')
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b = 8;
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else
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b = 10;
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while(c >= '0' && c <= '9') {
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cval = cval*b + c -'0';
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c = xread();
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}
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peekc = c;
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return(21);
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}
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if (c=='\'') { /* ' */
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getcc();
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return(21);
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}
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if (ct==123) { /* letter */
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sp = symbuf;
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while(ctab[c]==123 | ctab[c]==124) {
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if (sp<symbuf+9) *sp++ = c;
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c = xread();
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}
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*sp = '\0';
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peekc = c;
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csym = lookup();
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if (csym[0]==1) { /* keyword */
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cval = csym[1];
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return(19);
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}
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return(20);
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}
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if (ct==127) { /* unknown */
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error('sy');
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c = xread();
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goto loop;
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}
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return(ctab[c]);
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}
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subseq(c,a,b) {
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extern peekc; // extern xread, peekc;
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if (!peekc)
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peekc = xread();
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if (peekc != c)
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return(a);
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peekc = 0;
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return(b);
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}
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getcc() {
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extern cval;
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auto c;
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cval = 0;
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if ((c = mapch('\'')) < 0) return;
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cval = c;
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if ((c = mapch('\'')) < 0) return;
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cval = cval * 512 + c;
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if ((c = mapch('\'')) >= 0)
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error('cc');
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}
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mapch(c) {
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extern peekc, line;
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auto a;
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if((a=xread())==c)
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return(-1);
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if (a=='\n' | a==0 | a==4) {
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error('cc');
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peekc = a;
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return(-1);
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}
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if (a=='*') {
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a=xread();
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if (a=='0')
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return('\0');
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if (a=='e')
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return(4);
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if (a=='(')
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return('{');
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if (a==')')
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return('}');
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if (a=='t')
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return('\t');
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if (a=='r')
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return('\r');
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if (a=='n')
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return('\n');
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}
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return(a);
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}
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void expr(int lev) {
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int o;
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o = symbol();
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if (o==21) { /* constant */
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case21:
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gen('n',5); /* litrl */
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xwrite(' ');
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number(cval);
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xwrite('\n');
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goto loop;
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}
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if (o==20) { /* name */
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if (*csym==0) {
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if((peeksym=symbol())==6) { /* ( */
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*csym = 6; /* extern */
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}
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else {
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if(csym[2]==0) /* unseen so far */
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csym[2] = isn++;
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}
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}
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if(*csym==6) /* extern */
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gens('x',csym+4);
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else
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gen('a',csym+4);
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goto loop;
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}
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if (o==34) { /* ! */
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expr(1);
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gen('u',4); /* unot */
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goto loop;
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}
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if (o==41) { /* - */
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peeksym = symbol();
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if (peeksym==21) { /* constant */
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peeksym = -1;
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cval = -cval;
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goto case21;
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}
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expr(1);
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gen('u',2); /* umin */
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goto loop;
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}
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if (o==47) { /* & */
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expr(1);
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gen('u',1); /* uadr */
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goto loop;
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}
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if (o==42) { /* * */
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expr(1);
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gen('u',3); /* uind */
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goto loop;
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}
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if (o==6) { /* ( */
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peeksym = o;
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pexpr();
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goto loop;
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}
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error('ex');
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loop:
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o = symbol();
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if (lev>=14 & o==80) { /* = */
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expr(14);
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gen('b',1); /* asg */
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goto loop;
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}
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if (lev>=10 & o==48) { /* | ^ */
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expr(9);
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gen('b',2); /* bor */
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goto loop;
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}
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if (lev>=8 & o==47) { /* & */
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expr(7);
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gen('b',3); /* band */
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goto loop;
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}
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if (lev>=7 & o>=60 & o<=61) { /* == != */
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expr(6);
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gen('b',o-56); /* beq bne */
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goto loop;
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}
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if (lev>=6 & o>=62 & o<=65) { /* <= < >= > */
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expr(5);
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gen('b',o-56); /* ble blt bge bgt */
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goto loop;
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}
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if (lev>=4 & o>=40 & o<=41) { /* + - */
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expr(3);
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gen('b',o-28); /* badd bmin */
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goto loop;
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}
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if (lev>=3 & o>=42 & o<=43) { /* * / */
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expr(2);
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gen('b',o-27); /* bmul bdiv */
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goto loop;
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}
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if (lev>=3 & o==44) { /* % */
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expr(2);
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gen('b',14); /* bmod */
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goto loop;
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}
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if (o==4) { /* [ */
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expr(15);
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if (symbol() != 5)
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error('[]');
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gen('b',12); /* badd */
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gen('u',3); /* uind */
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goto loop;
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}
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if (o==6) { /* ( */
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o = symbol();
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if (o==7) /* ) */
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gen('n',1); /* mcall */
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else {
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gen('n',2); /* mark */
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peeksym = o;
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while (o!=7) {
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expr(15);
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o = symbol();
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if (o!=7 && o!=9) { /* ) , */
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error('ex');
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return;
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}
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}
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gen('n',3);
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}
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goto loop;
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}
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peeksym = o;
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}
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#if 0
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decl(kw) {
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extern csym[], symbol, paraml[], parame[];
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extern error, cval, peeksym, exit;
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int t[], n, o;
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while((o=symbol())==20) { /* name */
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if(kw>=5) { /* type or sort? */
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if(*csym>0)
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error('rd'); //error("%p redeclared", csym[4]);
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*csym = kw;
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} else {
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if ((csym[1]&017)!=0)
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error('rd'); //error("%p redeclared", &csym[4]);
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csym[1] =| csym[1]&0760 | kw;
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if (*csym==0)
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*csym = -2;
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}
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while((o=symbol())==4) { /* [ */
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if((o=symbol())==21) { /* const */
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if(csym[1]>=020)
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error('de'); //error("Bad vector");
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csym[3] = cval;
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o = symbol();
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}
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if (o!=5) /* ] */
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goto syntax;
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csym[1] =+ 020;
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}
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if(kw==8) { /* parameter */
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*csym = -1;
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if (paraml==0)
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paraml = csym;
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else
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*parame = csym;
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parame = csym;
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}
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if (o!=9) /* , */
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break;
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}
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if(o==1 & kw!=8 | o==7 & kw==8)
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return;
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syntax:
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error('[]'); //error("Declaration syntax");
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}
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#endif
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function() {
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// extern declare, blkhed, blkend;
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// extern printf, statement, peeksym, cval, symbol;
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// extern paraml;
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// auto o;
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// printf(".text; 1:mov r5,-(sp); mov sp,r5\n");
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// declare(8);
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// declist();
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gen('s',2); /* ??? */
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statement(1);
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gen('n',7); /* retrn */
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}
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|
|
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extdef() {
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// extern eof, function, cval;
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// extern symbol, block, printf, pname, csym[];
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// extern error;
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auto o, c, *cs;
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// char s;
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o = symbol();
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if(o==0 | o==1) /* EOF */
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return;
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|
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if(o!=20)
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goto syntax;
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csym[0] = 6;
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cs = csym + 4;
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xwrite('.');
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name(cs);
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xwrite(': ');
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xwrite('.+');
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xwrite('1\n');
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// s = ".data; %p:1f\n";
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o=symbol();
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if (o==6) { /* ( */
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function();
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return;
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}
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|
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if (o==2) { /* $( */
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peeksym = o;
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function();
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return;
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}
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|
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if (o==21) { /* const */
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printf(".data; %p: %o\n", cs, cval);
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if((o=symbol())!=1) /* ; */
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goto syntax;
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return;
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}
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|
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if (o==1) { /* ; */
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printf(".bss; %p: .=.+2\n", cs);
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return;
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}
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|
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if (o==4) { /* [ */
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c = 0;
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if((o=symbol())==21) { /* const */
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c = cval<<1;
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o = symbol();
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}
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if(o!=5) /* ] */
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goto syntax;
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if((o=symbol())==1) { /* ; */
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printf(".bss; 1:.=.+%o\n", c);
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return;
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}
|
|
printf("1:");
|
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while(o==21) { /* const */
|
|
printf("%o\n", cval);
|
|
c =- 2;
|
|
if((o=symbol())==1) /* ; */
|
|
goto done;
|
|
if(o!=9) /* , */
|
|
goto syntax;
|
|
else
|
|
o = symbol();
|
|
}
|
|
goto syntax;
|
|
done:
|
|
if(c>0)
|
|
printf(".=.+%o\n", c);
|
|
return;
|
|
}
|
|
|
|
if (o==0) /* EOF */
|
|
return;
|
|
|
|
syntax:
|
|
error('xx');
|
|
statement(0);
|
|
}
|
|
|
|
statement(d) {
|
|
// extern symbol, error, blkhed, eof, peeksym;
|
|
// extern blkend, csym[], rcexpr, block[], tree[], regtab[];
|
|
// extern jumpc, jump, label, contlab, brklab, cval;
|
|
// extern swp[], isn, pswitch, peekc, slabel;
|
|
// extern efftab[], declare, deflab, swtab[], swsiz, branch;
|
|
|
|
// int o, o1, o2, np[];
|
|
int o, o1, o2, n, *np;
|
|
|
|
stmt:
|
|
o = symbol();
|
|
|
|
if (o==0) /* EOF */
|
|
{
|
|
error('fe'); //"Unexpected EOF");
|
|
return;
|
|
}
|
|
|
|
if (o==1 || o==3) /* ; } */
|
|
return;
|
|
|
|
if (o==2) { /* { */
|
|
if(d)
|
|
blkhed();
|
|
while (!eof) {
|
|
o = symbol();
|
|
if (o==3) /* } */
|
|
return;
|
|
peeksym = o;
|
|
statement(0);
|
|
}
|
|
error('$)'); //error("Missing '}'");
|
|
return;
|
|
}
|
|
|
|
if (o==19) { /* keyword */
|
|
|
|
#if 0
|
|
|
|
if (cval==10) { /* goto */
|
|
o1 = block(1,102,0,0,tree());
|
|
// rcexpr(o1, regtab);
|
|
goto semi;
|
|
}
|
|
#endif
|
|
|
|
if (cval==11) { /* return */
|
|
if((peeksym=symbol())==6) /* ( */
|
|
pexpr();
|
|
gen('n',7); /* retrn */
|
|
goto semi;
|
|
}
|
|
|
|
if (cval==12) { /* if */
|
|
pexpr();
|
|
o1 = isn;
|
|
isn++;
|
|
jumpc(o1);
|
|
statement(0);
|
|
o = symbol();
|
|
if (o==19 & cval==14) { /* else */
|
|
o2 = isn;
|
|
isn++;
|
|
jump(o2);
|
|
label(o1);
|
|
statement(0);
|
|
label(o2);
|
|
return;
|
|
}
|
|
peeksym = o;
|
|
label(o1);
|
|
return;
|
|
}
|
|
|
|
if (cval==13) { /* while */
|
|
o1 = isn;
|
|
isn++;
|
|
label(o1);
|
|
pexpr();
|
|
o2 = isn;
|
|
isn++;
|
|
jumpc(o2);
|
|
statement(0);
|
|
jump(o1);
|
|
label(o2);
|
|
return;
|
|
}
|
|
|
|
error('sx');
|
|
goto syntax;
|
|
}
|
|
|
|
if (o==20) { /* name */
|
|
#if 0
|
|
if (peekc==':') {
|
|
peekc = 0;
|
|
if (csym[0]>0) {
|
|
error('rd');
|
|
goto stmt;
|
|
}
|
|
csym[0] = 2;
|
|
csym[1] = 020; /* int[] */
|
|
// if (csym[2]==0)
|
|
// csym[2] = isn++;
|
|
slabel();
|
|
goto stmt;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
peeksym = o;
|
|
expr(15);
|
|
|
|
semi:
|
|
o = symbol();
|
|
if (o==1) /* ; */
|
|
return;
|
|
|
|
syntax:
|
|
error('sz');
|
|
goto stmt;
|
|
}
|
|
|
|
pexpr()
|
|
{
|
|
auto o, t;
|
|
|
|
if ((o=symbol())==6) { /* ( */
|
|
expr(15);
|
|
if ((o=symbol())==7) /* ) */
|
|
return;
|
|
}
|
|
error('()');
|
|
}
|
|
|
|
blkhed()
|
|
{
|
|
#if 0
|
|
extern symbol, cval, declare, peeksym, paraml[], parame[];
|
|
extern error, length, rlength, setstk, defvec, isn, defstat;
|
|
extern stack, hshtab[], hshsiz, pssiz;
|
|
int o, al, pl, cs[], hl;
|
|
|
|
declist();
|
|
stack = al = -2;
|
|
pl = 4;
|
|
while(paraml) {
|
|
*parame = 0;
|
|
paraml = *(cs = paraml);
|
|
cs[2] = pl;
|
|
*cs = 10;
|
|
pl =+ rlength(cs[1]);
|
|
}
|
|
cs = hshtab;
|
|
hl = hshsiz;
|
|
while(hl--) {
|
|
if (cs[4])
|
|
switch(cs[0]) {
|
|
|
|
/* sort unmentioned */
|
|
case 0177776: /* -2 */
|
|
cs[0] = 5; /* auto */
|
|
|
|
/* auto */
|
|
case 5:
|
|
if (cs[3]) { /* vector */
|
|
al =- (cs[3]*length(cs[1]-020)+1) & 077776;
|
|
setstk(al);
|
|
defvec(al);
|
|
}
|
|
cs[2] = al;
|
|
al =- rlength(cs[1]);
|
|
goto loop;
|
|
|
|
/* parameter */
|
|
case 10:
|
|
cs[0] = 5;
|
|
goto loop;
|
|
|
|
/* static */
|
|
case 7:
|
|
cs[2] = isn++;
|
|
defstat(cs);
|
|
goto loop;
|
|
|
|
loop:;
|
|
}
|
|
cs = cs+pssiz;
|
|
}
|
|
setstk(al);
|
|
#endif
|
|
}
|
|
|
|
gens(o,n) {
|
|
xwrite(' ');
|
|
xwrite(o);
|
|
xwrite(' .');
|
|
name(n);
|
|
xwrite('\n');
|
|
}
|
|
|
|
gen(o,n) {
|
|
xwrite(' ');
|
|
xwrite(o);
|
|
xwrite(' ');
|
|
number(n);
|
|
xwrite('\n');
|
|
}
|
|
|
|
jumpc(n) {
|
|
xwrite(' f'); /* ifop */
|
|
xwrite(' .');
|
|
number(n);
|
|
xwrite('\n');
|
|
}
|
|
|
|
jump(lbl) {
|
|
xwrite(' t'); /* traop */
|
|
xwrite(' .');
|
|
number(lbl);
|
|
xwrite('\n');
|
|
}
|
|
|
|
label(lbl) {
|
|
xwrite('.');
|
|
number(lbl);
|
|
xwrite(': ');
|
|
xwrite('t ');
|
|
xwrite('.+');
|
|
xwrite('1\n');
|
|
}
|
|
|
|
printn(n) {
|
|
if (n > 9) {
|
|
printn(n / 10);
|
|
n = n % 10;
|
|
}
|
|
xwrite(n + '0');
|
|
}
|
|
|
|
number(x) {
|
|
if (x < 0) {
|
|
xwrite('-');
|
|
x = -x;
|
|
}
|
|
printn(x);
|
|
}
|
|
|
|
name(int *s) {
|
|
while (*s) {
|
|
xwrite(*s);
|
|
s = s + 1;
|
|
}
|
|
}
|
|
|
|
error(code)
|
|
{
|
|
extern line;
|
|
int f;
|
|
|
|
nerror++;
|
|
xflush();
|
|
f = fout;
|
|
fout = 1;
|
|
xwrite(code);
|
|
xwrite(' ');
|
|
if (code=='rd' | code=='un') {
|
|
name(csym + 4);
|
|
xwrite(' ');
|
|
}
|
|
printn(line);
|
|
xwrite('\n');
|
|
fout = f;
|
|
}
|
|
|
|
// runtime:
|
|
|
|
xread() {
|
|
char buf[1];
|
|
if (read(fin, buf, 1) <= 0)
|
|
return 4;
|
|
return buf[0];
|
|
}
|
|
|
|
xwrite(int c) {
|
|
char buf[2];
|
|
if (c & 0xff00) {
|
|
buf[0] = (c >> 8) & 0xff;
|
|
buf[1] = c & 0xff;
|
|
write(fout, buf, 2);
|
|
} else {
|
|
buf[0] = c & 0xff;
|
|
write(fout, buf, 1);
|
|
}
|
|
}
|
|
|
|
xflush() {
|
|
} |