567 lines
12 KiB
C
567 lines
12 KiB
C
#include "bem.h"
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#ifndef NORSCID
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static char rcs_id[] = "$Header$" ;
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#endif
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/* Here we find all routines dealing with pure EM code generation */
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static int emlabel=1;
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genlabel() { return(emlabel++);}
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genemlabel()
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{
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int l;
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l=genlabel();
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fprintf( emfile,"l%d\n",l);
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return(l);
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}
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genrom()
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{
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int l;
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l= genemlabel();
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fprintf(emfile," rom ");
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return(l);
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}
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where()
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{
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return(emlinecount);
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}
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exchange(blk1,blk2)
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int blk1,blk2;
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{
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/* exchange assembler blocks */
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if(debug) printf("exchange %d %d %d\n",blk1,blk2,emlinecount);
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fprintf(tmpfile," exc %d,%d\n",blk2-blk1,emlinecount-blk2);
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emlinecount++;
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}
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/* routines to manipulate the tmpfile */
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int emlinecount; /* count number of lines generated */
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/* this value can be used to generate EXC */
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int tronoff=0;
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newemblock(nr)
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int nr;
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{
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/* save location on tmpfile */
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currline->offset= ftell(tmpfile);
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fprintf(tmpfile,"%d\n",currline->emlabel);
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fprintf(tmpfile," lin %d\n",nr);
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emlinecount += 2;
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if( tronoff || traceflag) emcode("cal","$_trace");
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}
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emcode(operation,params)
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char *operation,*params;
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{
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fprintf(tmpfile," %s %s\n",operation,params);
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emlinecount++;
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}
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/* Handle data statements */
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int dataused=0;
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List *datalist=0;
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datastmt()
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{
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List *l,*l1;
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l= (List *) salloc(sizeof(List));
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l->linenr= currline->linenr;
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l->emlabel= (long) ftell(datfile);
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if( datalist==0)
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{
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datalist=l;
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datfile= fopen(datfname,"w");
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if( datfile==NULL) fatal("improper file creation permission");
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}else{
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l1= datalist;
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while(l1->nextlist) l1= l1->nextlist;
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l1->nextlist=l;
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}
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dataused=1;
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}
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datatable()
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{
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List *l;
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int line=0;
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/* called at end to generate the data seek table */
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fprintf(emfile," exa _seektable\n");
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fprintf(emfile,"_seektable\n");
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l= datalist;
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while(l)
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{
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fprintf(emfile," rom %d,%d\n", l->linenr,line++);
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l= l->nextlist;
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}
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fprintf(emfile," rom 0,0\n");
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}
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/* ERROR and exception handling */
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exceptstmt(lab)
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int lab;
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{
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/* exceptions to subroutines are supported only */
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extern int gosubcnt;
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List *l;
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emcode("loc",itoa(gosubcnt));
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l= (List *) gosublabel();
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l->emlabel= gotolabel(lab);
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emcode("cal","$_trpset");
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emcode("asp",EMINTSIZE);
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}
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errorstmt(exprtype)
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int exprtype;
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{
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/* convert expression to a valid error number */
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/* obtain the message and print it */
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emcode("cal","$error");
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emcode("asp",typesize(exprtype));
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}
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/* BASIC IO */
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openstmt(recsize)
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int recsize;
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{
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emcode("loc",itoa(recsize));
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emcode("cal","$_opnchn");
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emcode("asp",EMPTRSIZE);
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emcode("asp",EMPTRSIZE);
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emcode("asp",EMINTSIZE);
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}
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printstmt(exprtype)
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int exprtype;
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{
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switch(exprtype)
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{
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case INTTYPE:
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emcode("cal","$_prinum");
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emcode("asp",typestring(INTTYPE));
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break;
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case FLOATTYPE:
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case DOUBLETYPE:
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emcode("cal","$_prfnum");
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emcode("asp",typestring(DOUBLETYPE));
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break;
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case STRINGTYPE:
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emcode("cal","$_prstr");
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emcode("asp",EMPTRSIZE);
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break;
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case 0: /* result of tab function etc */
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break;
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default:
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error("printstmt:unexpected");
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}
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}
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zone(i)
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int i;
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{
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if( i)emcode("cal","$_zone");
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}
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writestmt(exprtype,comma)
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int exprtype,comma;
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{
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if( comma) emcode("cal","$_wrcomma");
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switch(exprtype)
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{
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case INTTYPE:
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emcode("cal","$_wrint");
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break;
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case FLOATTYPE:
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case DOUBLETYPE:
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emcode("cal","$_wrint");
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break;
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case STRINGTYPE:
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emcode("cal","$_wrstr");
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break;
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default:
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error("printstmt:unexpected");
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}
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emcode("asp",EMPTRSIZE);
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}
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restore(lab)
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int lab;
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{
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/* save this information too */
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emcode("loc",itoa(0));
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emcode("cal","$_setchannel");
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emcode("asp",EMINTSIZE);
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emcode("loc",itoa(lab));
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emcode("cal","$_restore");
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emcode("asp",EMINTSIZE);
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}
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prompt(qst)
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int qst;
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{
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setchannel(-1);
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emcode("cal","$_prstr");
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emcode("asp",EMPTRSIZE);
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if(qst) emcode("cal","$_qstmark");
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}
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linestmt(type)
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int type;
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{
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if( type!= STRINGTYPE)
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error("String variable expected");
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emcode("cal","$_rdline");
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emcode("asp",EMPTRSIZE);
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}
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readelm(type)
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int type;
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{
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switch(type)
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{
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case INTTYPE:
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emcode("cal","$_readint");
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break;
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case FLOATTYPE:
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case DOUBLETYPE:
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emcode("cal","$_readflt");
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break;
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case STRINGTYPE:
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emcode("cal","$_readstr");
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break;
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default:
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error("readelm:unexpected type");
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}
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emcode("asp",EMPTRSIZE);
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}
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/* Swap exchanges the variable values */
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swapstmt(ltype,rtype)
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int ltype, rtype;
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{
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if( ltype!= rtype)
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error("Type mismatch");
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else
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switch(ltype)
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{
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case INTTYPE:
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emcode("cal","$_intswap");
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break;
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case FLOATTYPE:
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case DOUBLETYPE:
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emcode("cal","$_fltswap");
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break;
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case STRINGTYPE:
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emcode("cal","$_strswap");
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break;
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default:
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error("swap:unexpected");
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}
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emcode("asp",EMPTRSIZE);
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emcode("asp",EMPTRSIZE);
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}
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/* input/output handling */
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setchannel(val)
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int val;
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{ /* obtain file descroption */
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emcode("loc",itoa(val));
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emcode("cal","$_setchannel");
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emcode("asp",EMINTSIZE);
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}
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/* The if-then-else statements */
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ifstmt(type)
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int type;
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{
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/* This BASIC follows the True= -1 rule */
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int nr;
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nr= genlabel();
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if( type == INTTYPE)
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emcode("zeq",instrlabel(nr));
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else
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if( type == FLOATTYPE)
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{
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emcode("lae","fltnull");
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emcode("loi",EMFLTSIZE);
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emcode("cmf",EMFLTSIZE);
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emcode("zeq",instrlabel(nr));
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}
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else error("Integer or Float expected");
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return(nr);
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}
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thenpart( elselab)
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int elselab;
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{
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int nr;
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nr=genlabel();
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emcode("bra",instrlabel(nr));
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fprintf(tmpfile,"%d\n",elselab);
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emlinecount++;
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return(nr);
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}
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elsepart(lab)int lab;
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{
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fprintf(tmpfile,"%d\n",lab); emlinecount++;
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}
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/* generate code for the for-statement */
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#define MAXFORDEPTH 20
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struct FORSTRUCT{
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Symbol *loopvar; /* loop variable */
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int initaddress;
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int limitaddress;
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int stepaddress;
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int fortst; /* variable limit test */
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int forinc; /* variable increment code */
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int forout; /* end of loop */
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} fortable[MAXFORDEPTH];
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int forcnt= -1;
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forinit(s)
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Symbol *s;
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{
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int type;
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struct FORSTRUCT *f;
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dcltype(s);
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type= s->symtype;
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forcnt++;
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if( (type!=INTTYPE && type!=FLOATTYPE && type!=DOUBLETYPE) ||
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s->dimensions)
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error("Illegal loop variable");
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if( forcnt >=MAXFORDEPTH)
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error("too many for statements");
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else{
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f=fortable+forcnt;
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f->loopvar=s;
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f->fortst=genlabel();
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f->forinc=genlabel();
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f->forout=genlabel();
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/* generate space for temporary objects */
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f->initaddress= dclspace(type);
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f->limitaddress= dclspace(type);
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f->stepaddress= dclspace(type);
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}
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}
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forexpr(type)
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int type;
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{
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/* save start value of loop variable in a save place*/
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/* to avoid clashing with final value and step expression */
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int result;
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result= fortable[forcnt].loopvar->symtype;
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conversion(type,result);
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storevar(fortable[forcnt].initaddress, result);
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}
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forlimit(type)
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int type;
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{
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/* save the limit value too*/
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int result;
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result= fortable[forcnt].loopvar->symtype;
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conversion(type,result);
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storevar(fortable[forcnt].limitaddress, result);
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}
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forskipped(f)
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struct FORSTRUCT *f;
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{
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int type;
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type= f->loopvar->symtype;
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/* evaluate lower bound times sign of step */
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emcode("lae",datalabel(f->initaddress));
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loadvar(type);
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conversion(type,DOUBLETYPE);
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emcode("lae",datalabel(f->stepaddress));
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loadvar(type);
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conversion(type,DOUBLETYPE);
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emcode("cal","$_sgn");
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emcode("asp",EMFLTSIZE);
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emcode("lfr",EMINTSIZE);
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conversion(INTTYPE,DOUBLETYPE);
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emcode("mlf",EMFLTSIZE);
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/* evaluate higher bound times sign of step */
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emcode("lae",datalabel(f->limitaddress));
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loadvar(type);
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conversion(type,DOUBLETYPE);
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emcode("lae",datalabel(f->stepaddress));
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loadvar(type);
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conversion(type,DOUBLETYPE);
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emcode("cal","$_sgn");
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emcode("asp",EMFLTSIZE);
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emcode("lfr",EMINTSIZE);
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conversion(INTTYPE,DOUBLETYPE);
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emcode("mlf",EMFLTSIZE);
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/* skip condition */
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emcode("cmf",EMFLTSIZE);
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emcode("zgt",instrlabel(f->forout));
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}
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forstep(type)
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int type;
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{
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int result;
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int varaddress;
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struct FORSTRUCT *f;
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f= fortable+forcnt;
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result= f->loopvar->symtype;
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varaddress= f->loopvar->symalias;
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conversion(type,result);
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storevar(f->stepaddress, result);
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/* all information available, generate for-loop head */
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/* test for ingoring loop */
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forskipped(f);
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/* set initial value */
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emcode("lae",datalabel(f->initaddress));
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loadvar(result);
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emcode("lae",datalabel(varaddress));
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emcode("sti",typestring(result));
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emcode("bra",instrlabel(f->fortst));
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/* increment loop variable */
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fprintf(tmpfile,"%d\n",f->forinc);
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emlinecount++;
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emcode("lae",datalabel(varaddress));
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loadvar(result);
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emcode("lae",datalabel(f->stepaddress));
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loadvar(result);
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if(result == INTTYPE)
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emcode("adi",EMINTSIZE);
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else emcode("adf",EMFLTSIZE);
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emcode("lae",datalabel(varaddress));
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emcode("sti",typestring(result));
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/* test boundary */
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fprintf(tmpfile,"%d\n",f->fortst);
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emlinecount++;
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emcode("lae",datalabel(varaddress));
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loadvar(result);
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emcode("lae",datalabel(f->limitaddress));
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loadvar(result);
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if(result == INTTYPE)
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emcode("cmi",EMINTSIZE);
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else emcode("cmf",EMFLTSIZE);
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emcode("zgt",instrlabel(f->forout));
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}
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nextstmt(s)
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Symbol *s;
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{
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if(forcnt>MAXFORDEPTH || forcnt<0 ||
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( s && s!= fortable[forcnt].loopvar))
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error("NEXT without FOR");
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else{
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/* address of variable is on top of stack ! */
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emcode("bra",instrlabel(fortable[forcnt].forinc));
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fprintf(tmpfile,"%d\n",fortable[forcnt].forout);
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forcnt--;
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}
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}
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pokestmt(type1,type2)
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int type1,type2;
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{
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conversion(type1,INTTYPE);
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conversion(type2,INTTYPE);
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emcode("cal","$_poke");
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emcode("asp",EMINTSIZE);
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emcode("asp",EMINTSIZE);
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}
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/* generate code for the while statement */
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#define MAXDEPTH 20
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int whilecnt, whilelabels[MAXDEPTH][2]; /*0=head,1=out */
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whilestart()
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{
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whilecnt++;
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if( whilecnt==MAXDEPTH)
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fatal("too many nestings");
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/* gendummy label in graph */
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newblock(-1);
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whilelabels[whilecnt][0]= currline->emlabel;
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whilelabels[whilecnt][1]= genlabel();
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fprintf(tmpfile,"%d\n", whilelabels[whilecnt][0]);
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emlinecount++;
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}
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whiletst(exprtype)
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int exprtype;
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{
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/* test expression type */
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conversion(exprtype,INTTYPE);
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fprintf(tmpfile," zeq *%d\n",whilelabels[whilecnt][1]);
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emlinecount++;
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}
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wend()
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{
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if( whilecnt<1)
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error("not part of while statement");
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else{
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fprintf(tmpfile," bra *%d\n",whilelabels[whilecnt][0]);
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fprintf(tmpfile,"%d\n",whilelabels[whilecnt][1]);
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emlinecount++;
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emlinecount++;
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whilecnt--;
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}
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}
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/* generate code for the final version */
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prologcode()
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{
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/* generate the EM prolog code */
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fprintf(emfile,"fltnull\n con 0,0,0,0\n");
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fprintf(emfile,"dummy2\n con 0,0,0,0\n");
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fprintf(emfile,"tronoff\n con 0\n");
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fprintf(emfile,"dummy1\n con 0,0,0,0\n");
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fprintf(emfile," exa _iomode\n_iomode\n rom \"O\"\n");
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fprintf(emfile," exa _errsym\n");
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fprintf(emfile,"_errsym\n bss 2,0,1\n");
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fprintf(emfile," exa _erlsym\n");
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fprintf(emfile,"_erlsym\n bss 2,0,1\n");
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}
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prolog2()
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{
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fprintf(emfile," exp $main\n");
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fprintf(emfile," pro $main,0\n");
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fprintf(emfile," mes 3\n");
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fprintf(emfile," mes 9,0\n");
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/* Trap handling */
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fprintf(emfile," cal $_ini_trp\n");
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fprintf(emfile," exa trpbuf\n");
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fprintf(emfile," lae trpbuf\n");
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fprintf(emfile," cal $setjmp\n");
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fprintf(emfile," asp 4\n");
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fprintf(emfile," lfr %s\n",EMINTSIZE);
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fprintf(emfile," dup %s\n",EMINTSIZE);
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fprintf(emfile," zeq *0\n");
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fprintf(emfile," lae returns\n");
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fprintf(emfile," csa %s\n",EMINTSIZE);
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fprintf(emfile,"0\n");
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fprintf(emfile," asp EM_WSIZE\n");
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/* when data lists are used open its file */
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if( dataused)
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{
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fprintf(emfile," loc 0\n");
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fprintf(emfile," cal $_setchannel\n");
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fprintf(emfile," asp EM_WSIZE\n");
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fprintf(emfile,"datfname\n rom \"%s\"\n", datfname);
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fprintf(emfile," lae datfname\n");
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fprintf(emfile," cal $_opnchn\n");
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fprintf(emfile," asp EM_PSIZE\n");
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}
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datatable();
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}
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epilogcode()
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{
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/* finalization code */
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int nr;
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nr= genlabel();
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fprintf(emfile," bra *%d\n",nr);
|
|
genreturns();
|
|
fprintf(emfile,"%d\n",nr);
|
|
fprintf(emfile," loc 0\n");
|
|
fprintf(emfile," cal $_hlt\n");
|
|
fprintf(emfile," end 0\n");
|
|
fprintf(emfile," mes 4,4\n");
|
|
}
|