134 lines
2.6 KiB
C
134 lines
2.6 KiB
C
#ifndef NORCSID
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static char rcsid[] = "$Header$";
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#endif
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#include <em_spec.h>
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#include <em_flag.h>
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#include "assert.h"
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#include "param.h"
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#include "tables.h"
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#include "types.h"
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#include <cgg_cg.h>
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#include "data.h"
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#include "result.h"
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#include "extern.h"
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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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* Author: Hans van Staveren
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*/
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#ifndef NDEBUG
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#include <stdio.h>
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extern char em_mnem[][4];
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#endif
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byte *trypat(bp,len) register byte *bp; {
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register patlen,i;
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result_t result;
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getint(patlen,bp);
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if (len == 3) {
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if (patlen < 3)
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return(0);
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} else {
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if (patlen != len)
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return(0);
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}
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for(i=0;i<patlen;i++)
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if (emp[i].em_instr != (*bp++&BMASK))
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return(0);
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for (i=0;i<patlen;i++)
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if (emp[i].em_optyp==OPNO)
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dollar[i].e_typ=EV_UNDEF;
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else if ((dollar[i].e_typ=argtyp(emp[i].em_instr))==EV_INT)
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dollar[i].e_v.e_con=emp[i].em_u.em_ioper;
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else {
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dollar[i].e_v.e_addr.ea_str=emp[i].em_soper;
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dollar[i].e_v.e_addr.ea_off=0;
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}
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getint(i,bp);
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if (i!=0) {
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result = compute(&enodes[i]);
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if (result.e_typ != EV_INT || result.e_v.e_con == 0)
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return(0);
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}
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#ifndef NDEBUG
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if (Debug) {
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fprintf(stderr,"Matched:");
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for (i=0;i<patlen;i++)
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fprintf(stderr," %3.3s",em_mnem[emp[i].em_instr-sp_fmnem]);
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fprintf(stderr,"\n");
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}
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#endif
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saveemp = emp;
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emp += patlen;
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return(bp);
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}
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extern char em_flag[];
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argtyp(mn) {
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switch(em_flag[mn-sp_fmnem]&EM_PAR) {
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case PAR_W:
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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_N:
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case PAR_L:
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case PAR_F:
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case PAR_R:
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case PAR_C:
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return(EV_INT);
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default:
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return(EV_ADDR);
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}
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}
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byte *nextem(toplevel) {
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register i;
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short hash[3];
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register byte *bp;
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byte *cp;
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int index;
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register struct emline *ep;
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if (toplevel) {
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if (nemlines && emp>emlines) {
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nemlines -= emp-emlines;
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for (i=0,ep=emlines;i<nemlines;i++)
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*ep++ = *emp++;
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emp=emlines;
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}
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fillemlines();
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}
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hash[0] = emp[0].em_instr;
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hash[1] = (hash[0]<<4) ^ emp[1].em_instr;
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hash[2] = (hash[1]<<4) ^ emp[2].em_instr;
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for (i=2;i>=0;i--) {
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index = pathash[hash[i]&BMASK];
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while (index != 0) {
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bp = &pattern[index];
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if ( bp[PO_HASH] == (hash[i]>>8))
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if ((cp=trypat(&bp[PO_MATCH],i+1)) != 0)
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return(cp);
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index = (bp[PO_NEXT]&BMASK) | (bp[PO_NEXT+1]<<8);
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}
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}
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return(0);
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}
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