203 lines
2.9 KiB
C
203 lines
2.9 KiB
C
/* $Header$ */
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/* EM CODE OUTPUT ROUTINES */
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#include <system.h>
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#include "em_private.h"
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#define put8(x) putbyte(x)
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#define put16(x) put8((int) x); put8((int) (x >> 8))
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#define put32(x) put16((int) x); put16((int) (x >> 16))
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/*
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putbyte(), C_open() and C_close() are the basic routines for
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respectively write on, open and close the output file.
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The put_*() functions serve as formatting functions of the
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various EM language constructs.
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See "Description of a Machine Architecture for use with
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Block Structured Languages" par. 11.2 for the meaning of these
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names.
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*/
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/* supply a kind of buffered output */
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static char obuf[BUFSIZ];
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static char *opp = &obuf[0];
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static File *ofp = 0;
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static
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flush() {
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if (sys_write(ofp, &obuf[0], opp - &obuf[0]) == 0) {
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C_failed();
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}
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opp = &obuf[0];
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}
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#define Xputbyte(c) if (opp == &obuf[BUFSIZ]) flush(); *opp++ = (c)
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putbyte(b)
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int b;
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{
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Xputbyte(b);
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}
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#define putbyte(c) Xputbyte(c)
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C_init(w, p)
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arith w, p;
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{
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}
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C_open(nm) /* open file for compact code output */
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char *nm;
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{
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if (nm == 0)
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ofp = STDOUT; /* standard output */
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else
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if (sys_open(nm, OP_WRITE, &ofp) == 0)
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return 0;
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return 1;
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}
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C_close()
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{
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if (opp != &obuf[0]) flush();
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if (ofp != STDOUT)
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sys_close(ofp);
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ofp = 0;
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}
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C_busy()
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{
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return ofp != 0; /* true if code is being generated */
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}
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C_magic()
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{
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put16(sp_magic);
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}
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/*** the compact code generating routines ***/
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#define fit16i(x) ((x) >= (long)0xFFFF8000 && (x) <= (long)0x00007FFF)
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#define fit8u(x) ((x) <= 0xFF) /* x is already unsigned */
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put_ilb(l)
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register label l;
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{
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if (fit8u(l)) {
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put8(sp_ilb1);
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put8(l);
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}
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else {
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put8(sp_ilb2);
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put16(l);
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}
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}
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put_dlb(l)
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register label l;
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{
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if (fit8u(l)) {
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put8(sp_dlb1);
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put8(l);
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}
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else {
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put8(sp_dlb2);
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put16((int)l);
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}
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}
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put_cst(l)
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register arith l;
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{
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if (l >= (arith) -sp_zcst0 && l < (arith) (sp_ncst0 - sp_zcst0)) {
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/* we can convert 'l' to an int because its value
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can be stored in a byte.
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*/
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put8((int)l + (sp_zcst0 + sp_fcst0));
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}
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else
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if (fit16i(l)) { /* the cast from long to int causes no trouble here */
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put8(sp_cst2);
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put16((int) l);
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}
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else {
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put8(sp_cst4);
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put32(l);
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}
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}
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put_doff(l, v)
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label l;
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arith v;
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{
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if (v == 0) {
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put_dlb(l);
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}
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else {
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put8(sp_doff);
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put_dlb(l);
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put_cst(v);
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}
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}
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put_noff(s, v)
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char *s;
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arith v;
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{
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if (v == 0) {
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put_dnam(s);
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}
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else {
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put8(sp_doff);
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put_dnam(s);
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put_cst(v);
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}
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}
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put_dnam(s)
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char *s;
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{
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put8(sp_dnam);
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put_str(s);
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}
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put_pnam(s)
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char *s;
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{
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put8(sp_pnam);
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put_str(s);
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}
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put_wcon(sp, v, sz) /* sp_icon, sp_ucon or sp_fcon with int repr */
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int sp;
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char *v;
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arith sz;
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{
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/* how 'bout signextension int --> long ??? */
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put8(sp);
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put_cst(sz);
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put_str(v);
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}
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put_str(s)
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register char *s;
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{
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register int len;
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put_cst((arith) (len = strlen(s)));
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while (--len >= 0) {
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put8(*s++);
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}
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}
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put_scon(b, n)
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register char *b;
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register arith n;
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{
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put8(sp_scon);
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put_cst(n);
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while (--n >= 0) {
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put8(*b++);
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}
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}
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