444 lines
8.7 KiB
C
444 lines
8.7 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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#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 you find all routines to evaluate expressions and
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generate code for assignment statements
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*/
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exprtype(ltype,rtype)
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int ltype,rtype;
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{
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/* determine the result type of an expression */
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if( ltype== STRINGTYPE || rtype==STRINGTYPE)
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{
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if( ltype!=rtype)
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error("type conflict, string expected");
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return( STRINGTYPE);
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}
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/* take maximum */
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if( ltype<rtype) return(rtype);
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return(ltype);
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}
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conversion(oldtype,newtype)
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int oldtype,newtype;
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{
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/* the value on top of the stack should be converted */
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if( oldtype==newtype) return;
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switch( oldtype)
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{
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case INTTYPE:
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if( newtype==FLOATTYPE || newtype==DOUBLETYPE)
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{
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emcode("loc",EMINTSIZE);
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emcode("loc",EMFLTSIZE);
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emcode("cif","");
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}else{
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if(debug)
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printf("type n=%d o=%d\n",newtype,oldtype);
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error("conversion error");
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}
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break;
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case FLOATTYPE:
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case DOUBLETYPE:
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if( newtype==INTTYPE)
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{
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/* rounded ! */
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emcode("cal","$_cint");
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emcode("asp",EMFLTSIZE);
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emcode("lfr",EMINTSIZE);
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break;
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}else
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if( newtype== FLOATTYPE || newtype==DOUBLETYPE)
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break;
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default:
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if(debug)
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printf("type n=%d o=%d\n",newtype,oldtype);
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error("conversion error");
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}
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}
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extraconvert(oldtype,newtype,topstack)
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int oldtype,newtype,topstack;
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{
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/* the value below the top of the stack should be converted */
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if( oldtype==newtype ) return;
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if( debug) printf("extra convert %d %d %d\n",oldtype,newtype,topstack);
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/* save top in dummy */
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switch( topstack)
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{
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case INTTYPE:
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emcode("ste","dummy1");
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break;
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case FLOATTYPE:
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case DOUBLETYPE:
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/* rounded ! */
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emcode("lae","dummy1");
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emcode("sti",EMFLTSIZE);
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break;
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default:
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error("conversion error");
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return;
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}
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/* now its on top of the stack */
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conversion(oldtype,newtype);
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/* restore top */
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switch( topstack)
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{
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case INTTYPE:
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emcode("loe","dummy1");
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break;
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case FLOATTYPE:
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case DOUBLETYPE:
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/* rounded ! */
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emcode("lae","dummy1");
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emcode("loi",EMFLTSIZE);
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}
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}
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boolop(ltype,rtype,operator)
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int ltype,rtype,operator;
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{
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if( operator != NOTSYM)
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{
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extraconvert(ltype,INTTYPE,rtype);
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conversion(rtype,INTTYPE);
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} else conversion(ltype,INTTYPE);
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switch( operator)
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{
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case NOTSYM: emcode("com",EMINTSIZE); break;
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case ANDSYM: emcode("and",EMINTSIZE); break;
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case ORSYM: emcode("ior",EMINTSIZE); break;
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case XORSYM: emcode("xor",EMINTSIZE); break;
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case EQVSYM:
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emcode("xor",EMINTSIZE);
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emcode("com",EMINTSIZE);
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break;
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case IMPSYM:
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/* implies */
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emcode("com",EMINTSIZE);
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emcode("and",EMINTSIZE);
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emcode("com",EMINTSIZE);
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break;
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default: error("boolop:unexpected");
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}
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return(INTTYPE);
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}
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genbool(opcode)
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char *opcode;
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{
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int l1,l2;
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l1= genlabel();
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l2= genlabel();
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emcode(opcode,instrlabel(l1));
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emcode("loc",itoa(0));
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emcode("bra",instrlabel(l2));
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fprintf(Tmpfile,"%d\n",l1); emlinecount++;
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emcode("loc",itoa(-1));
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fprintf(Tmpfile,"%d\n",l2); emlinecount++;
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}
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relop( ltype,rtype,operator)
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int ltype,rtype,operator;
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{
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int result;
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if(debug) printf("relop %d %d op=%d\n",ltype,rtype,operator);
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result= exprtype(ltype,rtype);
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extraconvert(ltype,result,rtype);
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conversion(rtype,result);
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/* compare the objects */
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if( result== INTTYPE)
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emcode("cmi", EMINTSIZE);
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else
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if( result==FLOATTYPE || result==DOUBLETYPE)
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emcode("cmf",EMFLTSIZE);
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else
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if( result==STRINGTYPE)
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{
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emcode("cal","$_strcomp");
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emcode("asp",EMPTRSIZE);
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emcode("asp",EMPTRSIZE);
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emcode("lfr",EMINTSIZE);
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} else error("relop:unexpected");
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/* handle the relational operators */
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switch(operator)
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{
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case '<': genbool("zlt"); break;
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case '>': genbool("zgt"); break;
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case '=': genbool("zeq"); break;
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case NESYM: genbool("zne"); break;
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case LESYM: genbool("zle"); break;
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case GESYM: genbool("zge"); break;
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default: error("relop:unexpected operator");
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}
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return(INTTYPE);
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}
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plusmin(ltype,rtype,operator)
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int ltype,rtype,operator;
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{
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int result;
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result= exprtype(ltype,rtype);
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if( result== STRINGTYPE)
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{
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if( operator== '+')
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{
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emcode("cal","$_concat");
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emcode("asp",EMPTRSIZE);
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emcode("asp",EMPTRSIZE);
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emcode("lfr",EMPTRSIZE);
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} else error("illegal operator");
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} else {
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extraconvert(ltype,result,rtype);
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conversion(rtype,result);
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if( result== INTTYPE)
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{
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if( operator=='+')
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emcode("adi",EMINTSIZE);
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else emcode("sbi",EMINTSIZE);
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} else{
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if( operator=='+')
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emcode("adf",EMFLTSIZE);
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else emcode("sbf",EMFLTSIZE);
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}
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}
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return(result);
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}
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muldiv(ltype,rtype,operator)
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int ltype,rtype,operator;
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{
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int result;
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result= exprtype(ltype,rtype);
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if(operator==MODSYM || operator== '\\') result=INTTYPE;
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extraconvert(ltype,result,rtype);
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conversion(rtype,result);
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if( result== INTTYPE)
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{
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if( operator=='/')
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{
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result= DOUBLETYPE;
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extraconvert(ltype,result,rtype);
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conversion(rtype,result);
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emcode("dvf",EMFLTSIZE);
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} else
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if( operator=='\\')
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emcode("dvi",EMINTSIZE);
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else
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if( operator=='*')
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emcode("mli",EMINTSIZE);
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else
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if( operator==MODSYM)
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emcode("rmi",EMINTSIZE);
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else error("illegal operator");
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} else{
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if( operator=='/')
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emcode("dvf",EMFLTSIZE);
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else
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if( operator=='*')
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emcode("mlf",EMFLTSIZE);
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else error("illegal operator");
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}
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return(result);
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}
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negate(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("ngi",EMINTSIZE); break;
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case DOUBLETYPE:
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case FLOATTYPE:
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emcode("ngf",EMFLTSIZE); break;
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default:
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error("Illegal operator");
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}
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return(type);
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}
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power(ltype,rtype)
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int ltype,rtype;
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{
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extraconvert(ltype,DOUBLETYPE,rtype);
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conversion(rtype,DOUBLETYPE);
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emcode("cal","$_power");
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emcode("asp",EMFLTSIZE);
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emcode("asp",EMFLTSIZE);
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emcode("lfr",EMFLTSIZE);
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return(DOUBLETYPE);
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}
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char *typesize(ltype)
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int ltype;
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{
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switch( ltype)
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{
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case INTTYPE:
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return(EMINTSIZE);
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case FLOATTYPE:
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case DOUBLETYPE:
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return(EMFLTSIZE);
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case STRINGTYPE:
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return(EMPTRSIZE);
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default:
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error("typesize:unexpected");
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if(debug) printf("type received %d\n",ltype);
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}
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return(EMINTSIZE);
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}
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/*
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loadptr(s)
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Symbol *s;
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{
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if( POINTERSIZE==WORDSIZE)
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fprintf(Tmpfile," loe l%d\n",s->symalias);
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else
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if( POINTERSIZE== 2*WORDSIZE)
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fprintf(Tmpfile," lde l%d\n",s->symalias);
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else error("loadptr:unexpected pointersize");
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}
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*/
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char *typestring(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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return(EMINTSIZE);
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case FLOATTYPE:
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case DOUBLETYPE:
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return(EMFLTSIZE);
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case STRINGTYPE:
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return(EMPTRSIZE);
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default:
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error("typestring: unexpected type");
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}
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return("0");
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}
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loadvar(type)
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int type;
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{
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/* load a simple variable its address is on the stack*/
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emcode("loi",typestring(type));
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}
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loadint(value)
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int value;
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{
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emcode("loc",itoa(value));
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return(INTTYPE);
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}
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loaddbl(value)
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double value;
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{
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int index;
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index= genlabel();
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fprintf(emfile,"l%d\n bss 8,%fF8,1\n",index,value);
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emcode("lae",datalabel(index));
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emcode("loi",EMFLTSIZE);
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return(DOUBLETYPE);
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}
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loadstr(value)
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int value;
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{
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emcode("lae",datalabel(value));
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}
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loadaddr(s)
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Symbol *s;
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{
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extern Symbol *fcn;
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int i,j;
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if(debug) printf("load %s %d\n",s->symname,s->symtype);
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if( s->symalias>0)
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emcode("lae",datalabel(s->symalias));
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else{
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j= -s->symalias;
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if(debug) printf("load parm %d\n",j);
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fprintf(Tmpfile," lal ");
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for(i=fcn->dimensions;i>j;i--)
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fprintf(Tmpfile,"%s+",typesize(fcn->dimlimit[i-1]));
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fprintf(Tmpfile,"0\n");
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emlinecount++;
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/*
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emcode("lal",datalabel(fcn->dimalias[-s->symalias]));
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*/
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}
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return(s->symtype);
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}
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assign(type,lt)
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int type,lt;
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{
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extern int e1,e2;
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conversion(lt,type);
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exchange(e1,e2);
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/* address is on stack already */
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emcode("sti",typestring(type) );
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}
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storevar(lab,type)
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int lab,type;
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{
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/*store value back */
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emcode("lae",datalabel(lab));
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emcode("sti",typestring(type));
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}
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/* maintain a stack of array references */
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int dimstk[MAXDIMENSIONS], dimtop= -1;
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Symbol *arraystk[MAXDIMENSIONS];
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newarrayload(s)
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Symbol *s;
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{
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if( dimtop<MAXDIMENSIONS) dimtop++;
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if( s->dimensions==0)
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{
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s->dimensions=1;
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defarray(s);
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}
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dimstk[dimtop]= s->dimensions;
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arraystk[dimtop]= s;
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emcode("lae",datalabel(s->symalias));
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}
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endarrayload()
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{
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return(arraystk[dimtop--]->symtype);
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}
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loadarray(type)
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int type;
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{
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int dim;
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Symbol *s;
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if( dimtop<0 || dimtop>=MAXDIMENSIONS)
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fatal("too many nested array references");
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/* index expression is on top of stack */
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s=arraystk[dimtop];
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dim= dimstk[dimtop];
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if( dim==0)
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{
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error("too many indices");
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dimstk[dim--]=0;
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return;
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}
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conversion(type,INTTYPE);
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dim--;
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/* first check index range */
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fprintf(Tmpfile," lae r%d\n",s->dimalias[dim]);
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emlinecount++;
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emcode("rck",EMINTSIZE);
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emcode("lae",datalabel(s->dimalias[dim]));
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emcode("aar",EMINTSIZE);
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dimstk[dimtop]--;
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}
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storearray(type)
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{
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/* used only in let statement */
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extern int e1,e2;
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exchange(e1,e2);
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emcode("sti",typestring(type));
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}
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