420 lines
7.6 KiB
C
420 lines
7.6 KiB
C
/* $Id$ */
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/*
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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 <stdio.h>
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#include <em_spec.h>
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#include <em_pseu.h>
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#include <em_mnem.h>
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#include <em_flag.h>
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#include <em_mes.h>
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#include "../share/types.h"
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#include "ca.h"
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#include "../share/debug.h"
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#include "../share/def.h"
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#include "../share/map.h"
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#include "../share/alloc.h"
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#define outbyte(b) putc(b,outfile)
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FILE *outfile;
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STATIC proc_p thispro;
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STATIC outinst(m) {
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outbyte( (byte) m );
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}
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STATIC coutshort(i) short i; {
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outbyte( (byte) (i&BMASK) );
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outbyte( (byte) (i>>8) );
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}
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STATIC coutint(i) short i; {
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if (i>= -sp_zcst0 && i< sp_ncst0-sp_zcst0)
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outbyte( (byte) (i+sp_zcst0+sp_fcst0) );
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else {
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outbyte( (byte) sp_cst2) ;
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coutshort(i);
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}
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}
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STATIC coutoff(off) offset off; {
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if ((short) off == off)
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coutint((short) off);
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else {
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outbyte( (byte) sp_cst4) ;
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coutshort( (short) (off&0177777L) );
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coutshort( (short) (off>>16) );
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}
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}
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STATIC outsym(s,t)
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char *s;
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int t;
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{
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register byte *p;
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register unsigned num;
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if (s[0] == '.') {
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num = atoi(&s[1]);
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if (num < 256) {
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outbyte( (byte) sp_dlb1) ;
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outbyte( (byte) (num) );
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} else {
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outbyte( (byte) sp_dlb2) ;
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coutshort((short) num);
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}
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} else {
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p= s;
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while (*p && p < &s[IDL])
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p++;
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num = p - s;
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outbyte( (byte) t);
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coutint((short) num);
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p = s;
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while (num--)
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outbyte( (byte) *p++ );
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}
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}
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STATIC outdsym(dbl)
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dblock_p dbl;
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{
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if (dnames[dbl->d_id]) outsym(dnames[dbl->d_id],sp_dnam);
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}
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STATIC outpsym(p)
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proc_p p;
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{
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outsym(pnames[p->p_id],sp_pnam);
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}
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STATIC outddef(id) short id; {
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dblock_p dbl;
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dbl = dmap[id];
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dbl->d_flags2 |= DF_SYMOUT;
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if (dbl->d_flags1 & DF_EXTERNAL) {
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outinst(ps_exa);
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outdsym(dbl);
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}
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}
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STATIC outpdef(p) proc_p p; {
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p->p_flags2 |= PF_SYMOUT;
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if (p->p_flags1 & PF_EXTERNAL) {
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outinst(ps_exp);
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outpsym(p);
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}
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}
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STATIC outdocc(obj) obj_p obj; {
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dblock_p dbl;
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dbl = obj->o_dblock;
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if ((dbl->d_flags2 & DF_SYMOUT) == 0) {
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dbl->d_flags2 |= DF_SYMOUT;
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if (dnames[dbl->d_id] != 0 &&
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(dbl->d_flags1 & DF_EXTERNAL) == 0) {
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outinst(ps_ina);
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outdsym(dbl);
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}
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}
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}
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STATIC outpocc(p) proc_p p; {
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if ((p->p_flags2 & PF_SYMOUT) == 0) {
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p->p_flags2 |= PF_SYMOUT;
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if ((p->p_flags1 & PF_EXTERNAL) == 0) {
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outinst(ps_inp);
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outpsym(p);
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}
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}
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}
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STATIC coutobject(obj)
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obj_p obj;
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{
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/* In general, an object is defined by a global data
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* label and an offset. There are two special cases:
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* the label is omitted if the object is part of the current
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* hol block; the offset is omitted if it is 0 and the label
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* was not omitted.
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*/
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if (dnames[obj->o_dblock->d_id] == 0) {
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coutoff(obj->o_off);
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} else {
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if (obj->o_off == 0) {
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outdsym(obj->o_dblock);
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} else {
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outbyte((byte) sp_doff);
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outdsym(obj->o_dblock);
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coutoff(obj->o_off);
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}
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}
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}
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STATIC cputstr(abp) register argb_p abp; {
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register argb_p tbp;
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register length;
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length = 0;
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tbp = abp;
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while (tbp!= (argb_p) 0) {
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length += tbp->ab_index;
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tbp = tbp->ab_next;
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}
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coutint(length);
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while (abp != (argb_p) 0) {
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for (length=0;length<abp->ab_index;length++)
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outbyte( (byte) abp->ab_contents[length] );
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abp = abp->ab_next;
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}
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}
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STATIC outnum(n)
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int n;
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{
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if (n < 256) {
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outbyte((byte) sp_ilb1);
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outbyte((byte) n);
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} else {
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outbyte((byte) sp_ilb2);
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coutshort((short) n);
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}
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}
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STATIC numlab(n)
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int n;
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{
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if (n < sp_nilb0) {
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outbyte((byte) (n + sp_filb0));
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} else {
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outnum(n);
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}
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}
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STATIC cputargs(lnp)
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line_p lnp;
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{
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register arg_p ap;
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int cnt = 0;
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ap = ARG(lnp);
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while (ap != (arg_p) 0) {
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switch(ap->a_type) {
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case ARGOFF:
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coutoff(ap->a_a.a_offset);
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break;
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case ARGOBJECT:
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coutobject(ap->a_a.a_obj);
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break;
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case ARGPROC:
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outpsym(ap->a_a.a_proc);
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break;
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case ARGINSTRLAB:
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outnum(ap->a_a.a_instrlab);
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break;
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case ARGSTRING:
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outbyte((byte) sp_scon);
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cputstr(&ap->a_a.a_string);
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break;
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case ARGICN:
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outbyte((byte) sp_icon);
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goto casecon;
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case ARGUCN:
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outbyte((byte) sp_ucon);
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goto casecon;
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case ARGFCN:
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outbyte((byte) sp_fcon);
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casecon:
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coutint(ap->a_a.a_con.ac_length);
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cputstr(&ap->a_a.a_con.ac_con);
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break;
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default:
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assert(FALSE);
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}
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ap = ap->a_next;
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/* Avoid generating extremely long CON or ROM statements */
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if (cnt++ > 10 && ap != (arg_p) 0 &&
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(INSTR(lnp) == ps_con || INSTR(lnp) == ps_rom)) {
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cnt = 0;
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outbyte((byte) sp_cend);
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outinst(INSTR(lnp));
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}
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}
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}
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STATIC outoperand(lnp)
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line_p lnp;
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{
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/* Output the operand of instruction lnp */
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switch(TYPE(lnp)) {
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case OPNO:
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if (INSTR(lnp) <= sp_lmnem &&
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(em_flag[INSTR(lnp)-sp_fmnem]&EM_PAR) != PAR_NO) {
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outbyte((byte) sp_cend);
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}
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break;
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case OPSHORT:
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if (INSTR(lnp) == ps_sym) {
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outsym(dnames[SHORT(lnp)],sp_dnam);
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} else {
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coutint(SHORT(lnp));
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}
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break;
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case OPOFFSET:
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coutoff(OFFSET(lnp));
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break;
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case OPINSTRLAB:
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if (INSTR(lnp) == op_lab) {
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numlab(INSTRLAB(lnp));
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} else {
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if (INSTR(lnp) < sp_fpseu) {
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coutint(INSTRLAB(lnp));
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} else {
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numlab(INSTRLAB(lnp));
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}
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}
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break;
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case OPOBJECT:
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coutobject(OBJ(lnp));
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break;
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case OPPROC:
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outpsym(PROC(lnp));
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break;
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case OPLIST:
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cputargs(lnp);
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switch(INSTR(lnp)) {
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case ps_con:
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case ps_rom:
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case ps_mes:
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outbyte((byte) sp_cend);
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/* list terminator */
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break;
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}
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break;
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default:
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assert(FALSE);
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}
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}
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STATIC outvisibility(lnp)
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line_p lnp;
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{
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/* In EM names of datalabels and procedures can be made
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* externally visible, so they can be used in other files.
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* There are special EM pseudo-instructions to state
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* explicitly that a certain identifier is externally
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* visible (ps_exa,ps_exp) or invisible (ps_ina,ps_inp).
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* If there is no such pseudo for a certain identifier,
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* the identifier is external only if its first use
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* in the current file is an applied occurrence.
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* Unfortunately the global optimizer may change the
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* order of defining and applied occurrences.
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* In the first optimizer pass (ic) we record for each identifier
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* whether it is external or not. If necessary we generate
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* pseudo instructions here.
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*/
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arg_p ap;
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short instr;
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instr = INSTR(lnp);
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switch(TYPE(lnp)) {
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case OPOBJECT:
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outdocc(OBJ(lnp));
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/* applied occurrence of a data label */
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break;
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case OPSHORT:
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if (instr == ps_sym) {
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outddef(SHORT(lnp));
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/* defining occ. data label */
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}
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break;
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case OPPROC:
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if (instr == ps_pro) {
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outpdef(PROC(lnp));
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/* defining occ. procedure */
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} else {
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outpocc(PROC(lnp));
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}
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break;
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case OPLIST:
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for (ap = ARG(lnp); ap != (arg_p) 0; ap = ap->a_next) {
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switch(ap->a_type) {
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case ARGOBJECT:
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outdocc(ap->a_a.a_obj);
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break;
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case ARGPROC:
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outpocc(ap->a_a.a_proc);
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break;
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}
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}
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break;
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}
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}
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cputlines(l,lf)
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line_p l;
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FILE *lf;
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{
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/* Output the lines in Campact assembly language
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* format.
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*/
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line_p next,lnp;
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outfile = lf;
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for (lnp = l; lnp != (line_p) 0; lnp = next) {
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next = lnp->l_next;
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outvisibility(lnp); /* take care of visibiltity rules */
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if (INSTR(lnp) != ps_sym && INSTR(lnp) != op_lab) {
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outinst(INSTR(lnp));
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}
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outoperand(lnp);
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switch(INSTR(lnp)) {
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case ps_pro:
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thispro = PROC(lnp);
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/* fall through ... */
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case ps_end:
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coutoff(thispro->p_localbytes);
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}
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oldline(lnp);
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}
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if (lmap != (line_p *) 0) {
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oldmap(lmap,llength);
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lmap = (line_p *) 0;
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}
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}
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cputmagic(lf)
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FILE *lf;
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{
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/* write the magic number */
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outfile = lf;
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coutshort(sp_magic);
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}
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