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489
doc/em/mkdispatch.c
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489
doc/em/mkdispatch.c
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/*
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* (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
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*
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* This product is part of the Amsterdam Compiler Kit.
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*
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* Permission to use, sell, duplicate or disclose this software must be
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* obtained in writing. Requests for such permissions may be sent to
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*
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* Dr. Andrew S. Tanenbaum
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* Wiskundig Seminarium
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* Vrije Universiteit
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* Postbox 7161
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* 1007 MC Amsterdam
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* The Netherlands
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*
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*/
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#include "ip_spec.h"
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#include <stdio.h>
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#include "em_spec.h"
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#include "em_flag.h"
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#ifndef NORCSID
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static char rcs_id[] = "$Header$" ;
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#endif
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/* This program reads the human readable interpreter specification
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and produces a efficient machine representation that can be
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translated by a C-compiler.
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*/
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#define NOTAB 600 /* The max no of interpreter specs */
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#define ESCAP1 256
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#define ESCAP2 257
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struct opform intable[NOTAB] ;
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struct opform *lastform = intable-1 ;
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int nerror = 0 ;
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int atend = 0 ;
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int line = 1 ;
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extern char em_mnem[][4] ;
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char esca1[] = "escape1" ;
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char esca2[] = "escape2" ;
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#define ename(no) ((no)==ESCAP1?esca1:(no)==ESCAP2?esca2:em_mnem[(no)])
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extern char em_flag[] ;
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main(argc,argv) char **argv ; {
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if ( argc>1 ) {
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if ( freopen(argv[1],"r",stdin)==NULL) {
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fatal("Cannot open %s",argv[1]) ;
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}
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}
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if ( argc>2 ) {
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if ( freopen(argv[2],"w",stdout)==NULL) {
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fatal("Cannot create %s",argv[2]) ;
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}
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}
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if ( argc>3 ) {
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fatal("%s [ file [ file ] ]",argv[0]) ;
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}
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atend=0 ;
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readin();
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atend=1 ;
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checkall();
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if ( nerror==0 ) {
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writeout();
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}
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return nerror ;
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}
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readin() {
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register struct opform *nextform ;
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char *ident();
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char *firstid ;
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for ( nextform=intable ;
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!feof(stdin) && nextform<&intable[NOTAB] ; ) {
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firstid=ident() ;
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if ( *firstid=='\n' || feof(stdin) ) continue ;
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lastform=nextform ;
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nextform->i_opcode = getmnem(firstid) ;
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nextform->i_flag = decflag(ident()) ;
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switch ( nextform->i_flag&OPTYPE ) {
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case OPMINI:
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case OPSHORT:
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nextform->i_num = atoi(ident()) ;
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break ;
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}
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nextform->i_low = atoi(ident()) ;
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if ( *ident()!='\n' ) {
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int c ;
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error("End of line expected");
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while ( (c=readchar())!='\n' && c!=EOF ) ;
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}
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nextform++ ;
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}
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if ( !feof(stdin) ) fatal("Internal table too small") ;
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}
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char *ident() {
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/* skip spaces and tabs, anything up to space,tab or eof is
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a identifier.
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Anything from # to end-of-line is an end-of-line.
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End-of-line is an identifier all by itself.
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*/
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static char array[200] ;
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register int c ;
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register char *cc ;
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do {
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c=readchar() ;
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} while ( c==' ' || c=='\t' ) ;
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for ( cc=array ; cc<&array[(sizeof array) - 1] ; cc++ ) {
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if ( c=='#' ) {
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do {
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c=readchar();
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} while ( c!='\n' && c!=EOF ) ;
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}
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*cc = c ;
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if ( c=='\n' && cc==array ) break ;
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c=readchar() ;
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if ( c=='\n' ) {
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pushback(c) ;
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break ;
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}
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if ( c==' ' || c=='\t' || c==EOF ) break ;
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}
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*++cc=0 ;
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return array ;
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}
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int getmnem(str) char *str ; {
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char (*ptr)[4] ;
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for ( ptr = em_mnem ; *ptr<= &em_mnem[sp_lmnem-sp_fmnem][0] ; ptr++ ) {
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if ( strcmp(*ptr,str)==0 ) return (ptr-em_mnem) ;
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}
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error("Illegal mnemonic") ;
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return 0 ;
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}
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error(str,a1,a2,a3,a4,a5,a6) /* VARARGS1 */ char *str ; {
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if ( !atend ) fprintf(stderr,"line %d: ",line) ;
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fprintf(stderr,str,a1,a2,a3,a4,a5,a6) ;
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fprintf(stderr,"\n");
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nerror++ ;
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}
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mess(str,a1,a2,a3,a4,a5,a6) /* VARARGS1 */ char *str ; {
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if ( !atend ) fprintf(stderr,"line %d: ",line) ;
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fprintf(stderr,str,a1,a2,a3,a4,a5,a6) ;
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fprintf(stderr,"\n");
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}
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fatal(str,a1,a2,a3,a4,a5,a6) /* VARARGS1 */ char *str ; {
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error(str,a1,a2,a3,a4,a5,a6) ;
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exit(1) ;
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}
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#define ILLGL -1
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check(val) int val ; {
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if ( val!=ILLGL ) error("Illegal flag combination") ;
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}
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int decflag(str) char *str ; {
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int type ;
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int escape ;
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int range ;
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int wordm ;
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int notzero ;
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type=escape=range=wordm=notzero= ILLGL ;
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while ( *str ) switch ( *str++ ) {
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case 'm' :
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check(type) ; type=OPMINI ; break ;
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case 's' :
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check(type) ; type=OPSHORT ; break ;
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case '-' :
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check(type) ; type=OPNO ; break ;
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case '1' :
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check(type) ; type=OP8 ; break ;
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case '2' :
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check(type) ; type=OP16 ; break ;
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case '4' :
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check(type) ; type=OP32 ; break ;
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case '8' :
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check(type) ; type=OP64 ; break ;
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case 'e' :
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check(escape) ; escape=0 ; break ;
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case 'N' :
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check(range) ; range= 2 ; break ;
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case 'P' :
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check(range) ; range= 1 ; break ;
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case 'w' :
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check(wordm) ; wordm=0 ; break ;
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case 'o' :
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check(notzero) ; notzero=0 ; break ;
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default :
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error("Unknown flag") ;
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}
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if ( type==ILLGL ) error("Type must be specified") ;
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switch ( type ) {
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case OP64 :
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case OP32 :
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if ( escape!=ILLGL ) error("Conflicting escapes") ;
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escape=ILLGL ;
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case OP16 :
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case OP8 :
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case OPSHORT :
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case OPNO :
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if ( notzero!=ILLGL ) mess("Improbable OPNZ") ;
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if ( type==OPNO && range!=ILLGL ) {
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mess("No operand in range") ;
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}
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}
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if ( escape!=ILLGL ) type|=OPESC ;
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if ( wordm!=ILLGL ) type|=OPWORD ;
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switch ( range) {
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case ILLGL : type|=OP_BOTH ;
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if ( type==OPMINI || type==OPSHORT )
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error("Minies and shorties must have P or N") ;
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break ;
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case 1 : type|=OP_POS ; break ;
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case 2 : type|=OP_NEG ; break ;
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}
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if ( notzero!=ILLGL ) type|=OPNZ ;
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return type ;
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}
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/* ----------- checking --------------*/
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int ecodes[256],codes[256],lcodes[256] ;
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char eflags[256], flags[256];
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int elows[256], lows[256];
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#define NMNEM (sp_lmnem-sp_fmnem+1)
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#define MUST 1
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#define MAY 2
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#define FORB 3
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char negc[NMNEM], zc[NMNEM], posc[NMNEM] ;
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checkall() {
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register i,flag ;
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register struct opform *next ;
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int opc,low ;
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for ( i=0 ; i<NMNEM ; i++ ) negc[i]=zc[i]=posc[i]=0 ;
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for ( i=0 ; i<256 ; i++ ) lcodes[i]= codes[i]= ecodes[i]= -1 ;
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codes[254]=ESCAP1; codes[255]=ESCAP2;
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atend=0 ; line=0 ;
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for ( next=intable ; next<=lastform ; next++ ) {
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line++ ;
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flag = next->i_flag&0377 ;
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opc = next->i_opcode&0377 ;
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low = next->i_low&0377 ;
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chkc(flag,low,opc,low) ;
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switch(flag&OPTYPE) {
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case OPNO : zc[opc]++ ; break ;
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case OPMINI :
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case OPSHORT :
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for ( i=1 ; i<((next->i_num)&0377) ; i++ ) {
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chkc(flag,low+i,opc,low) ;
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}
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if ( !(em_flag[opc]&PAR_G) &&
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(flag&OPRANGE)==OP_BOTH) {
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mess("Mini's and shorties should have P or N");
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}
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break ;
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case OP8 :
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error("OP8 is removed") ;
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break ;
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case OP16 :
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if ( flag&OP_NEG )
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negc[opc]++ ;
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else if ( flag&OP_POS )
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posc[opc]++ ;
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break ;
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case OP32 :
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case OP64 :
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break ;
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default :
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error("Illegal type") ;
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break ;
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}
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}
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atend=1 ;
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for ( i=0 ; i<256 ; i++ ) if ( codes[i]== -1 ) {
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mess("interpreter opcode %d not used",i) ;
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}
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for ( opc=0 ; opc<NMNEM ; opc++ ) {
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switch(em_flag[opc]&EM_PAR) {
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case PAR_NO :
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ckop(opc,MUST,FORB,FORB) ;
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break ;
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case PAR_C:
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case PAR_D:
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case PAR_F:
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case PAR_B:
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ckop(opc,FORB,MAY,MAY) ;
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break ;
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case PAR_N:
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case PAR_G:
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case PAR_S:
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case PAR_Z:
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case PAR_O:
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case PAR_P:
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ckop(opc,FORB,MAY,FORB) ;
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break ;
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case PAR_R:
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ckop(opc,FORB,MAY,FORB) ;
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break ;
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case PAR_L:
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ckop(opc,FORB,MUST,MUST) ;
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break ;
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case PAR_W:
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ckop(opc,MUST,MAY,FORB) ;
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break ;
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default :
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error("Unknown instruction type of %s",ename(opc)) ;
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break ;
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}
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}
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}
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chkc(flag,icode,emc,low) {
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if ( flag&OPESC ) {
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if ( ecodes[icode]!=-1 ) {
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mess("Escaped opcode %d used by %s and %s",
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icode,ename(emc),ename(ecodes[icode])) ;
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}
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ecodes[icode]=emc;
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eflags[icode]=flag;
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elows[icode]=low;
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} else switch ( flag&OPTYPE ) {
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default:
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if ( codes[icode]!=-1 ) {
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mess("Opcode %d used by %s and %s",
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icode,ename(emc),ename(codes[icode])) ;
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}
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codes[icode]=emc;
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flags[icode]=flag;
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lows[icode]=low;
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break ;
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case OP32:
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case OP64:
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if ( lcodes[icode]!=-1 ) {
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mess("Long opcode %d used by %s and %s",
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icode,ename(emc),ename(codes[icode])) ;
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}
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lcodes[icode]=emc;
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break ;
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}
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}
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ckop(emc,zf,pf,nf) {
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if ( zc[emc]>1 ) mess("More then one OPNO for %s",ename(emc)) ;
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if ( posc[emc]>1 ) mess("More then one OP16(pos) for %s",ename(emc)) ;
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if ( negc[emc]>1 ) mess("More then one OP16(neg) for %s",ename(emc)) ;
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switch(zf) {
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case MUST:
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if ( zc[emc]==0 ) mess("No OPNO for %s",ename(emc)) ;
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break ;
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case FORB:
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if ( zc[emc]==1 ) mess("Forbidden OPNO for %s",ename(emc)) ;
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break ;
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}
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switch(pf) {
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case MUST:
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if ( posc[emc]==0 ) mess("No OP16(pos) for %s",ename(emc)) ;
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break ;
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case FORB:
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if ( posc[emc]==1 )
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mess("Forbidden OP16(pos) for %s",ename(emc)) ;
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break ;
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}
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switch(nf) {
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case MUST:
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if ( negc[emc]==0 ) mess("No OP16(neg) for %s",ename(emc)) ;
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break ;
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case FORB:
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if ( negc[emc]==1 )
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mess("Forbidden OP16(neg) for %s",ename(emc)) ;
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break ;
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}
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}
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static int pushchar ;
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static int pushf ;
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int readchar() {
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int c ;
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if ( pushf ) {
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pushf=0 ;
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c = pushchar ;
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} else {
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if ( feof(stdin) ) return EOF ;
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c=getc(stdin) ;
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}
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if ( c=='\n' ) line++ ;
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return c ;
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}
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pushback(c) {
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if ( pushf ) {
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fatal("Double pushback") ;
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}
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pushf++ ;
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pushchar=c ;
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if ( c=='\n' ) line-- ;
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}
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writeout() {
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register int i;
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printf("DISPATCH\n");
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for (i = 0; i < 256;) {
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if (!(i % 8)) printf("%d\t", i);
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printf(ename(codes[i]));
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if (i < 254) {
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prx(flags[i],lows[i],i);
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}
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else putchar('\t');
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i++;
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if (!(i % 8)) putchar('\n');
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}
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printf("DISPATCH2\n");
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for (i = 0; i < 256;) {
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int x = 0;
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if (ecodes[i] != -1) {
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if (!(i % 8)) printf("%d\t", i);
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printf(ename(ecodes[i]));
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prx(eflags[i],elows[i],i);
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}
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else x = 1;
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i++;
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if (!(i % 8)) {
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putchar('\n');
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if (x) break;
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}
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}
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printf("DISPATCH3\n");
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i = 0;
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while (lcodes[i] != -1) {
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if (!(i % 8)) printf("%d\t", i);
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printf("%s\t", ename(ecodes[i]));
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i++;
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if (!(i % 8)) putchar('\n');
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}
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if (i % 8) putchar('\n');
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}
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prx(flg,low,opc)
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register int flg;
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{
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int arg = opc - low;
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putchar('.');
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switch(flg&OPTYPE) {
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case OPNO:
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putchar('z');
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break;
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case OP16:
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if (flg&OP_POS) putchar('p');
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else if (flg&OP_NEG) putchar('n');
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else putchar('l');
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if (flg&OPWORD) putchar('w');
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break;
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case OPSHORT:
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if (flg & OPWORD) putchar('w');
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else putchar('s');
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/* fall through */
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case OPMINI:
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if (flg & OPNZ) arg++;
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if (flg & OP_NEG) arg = -arg - 1;
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printf("%d",arg);
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if((flg&OPTYPE) == OPMINI && (flg & OPWORD)) putchar('W');
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}
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putchar('\t');
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}
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