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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_300
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338_02
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outcode.c
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1989-11-29
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450 lines
#include <stdio.h>
#include "c.h"
#include "expr.h"
#include "gen.h"
#include "cglbdec.h"
/*
* 68000 C compiler
*
* Copyright 1984, 1985, 1986 Matthew Brandt.
* all commercial rights reserved.
*
* This compiler is intended as an instructive tool for personal use. Any
* use for profit without the written consent of the author is prohibited.
*
* This compiler may be distributed freely for non-commercial use as long
* as this notice stays intact. Please forward any enhancements or questions
* to:
*
* Matthew Brandt
* Box 920337
* Norcross, Ga 30092
*/
/* variable initialization */
enum e_gt { nogen, bytegen, wordgen, longgen };
enum e_sg { noseg, codeseg, dataseg };
extern int echo;
int gentype = nogen;
int curseg = noseg;
int outcol = 0;
struct oplst {
char *s;
int ov;
} opl[] =
{ {"move",op_move}, {"move",op_moveq}, {"add",op_add},
{"add",op_addi}, {"add",op_addq}, {"sub",op_sub},
{"sub",op_subi}, {"sub",op_subq}, {"and",op_and},
{"or",op_or}, {"eor",op_eor}, {"muls",op_muls},
{"divs",op_divs}, {"swap",op_swap}, {"beq",op_beq},
{"bhi",op_bhi}, {"bhs",op_bhs}, {"blo",op_blo},
{"bls",op_bls}, {"mulu",op_mulu}, {"divu",op_divu},
{"bne",op_bne}, {"blt",op_blt}, {"ble",op_ble},
{"bgt",op_bgt}, {"bge",op_bge}, {"neg",op_neg},
{"not",op_not}, {"cmp",op_cmp}, {"ext",op_ext},
{"jmp",op_jmp}, {"jsr",op_jsr}, {"rts",op_rts},
{"lea",op_lea}, {"asr",op_asr}, {"asl",op_asl},
{"clr",op_clr}, {"link",op_link}, {"unlk",op_unlk},
{"bra",op_bra}, {"movem",op_movem}, {"pea",op_pea},
{"cmp",op_cmpi}, {"tst",op_tst}, {"dc",op_dc},
{0,0} };
putop(op)
int op;
{ int i;
i = 0;
while( opl[i].s )
{
if( opl[i].ov == op )
{
fprintf(output,"\t%s",opl[i].s);
if( echo )
fprintf(stdout,"\t%s",opl[i].s);
return;
}
++i;
}
printf("DIAG - illegal opcode.\n");
}
putconst(offset) /* put a constant to the output file. */
struct enode *offset;
{ switch( offset->nodetype )
{
case en_autocon:
case en_icon:
fprintf(output,"%d",offset->v.i);
if( echo )
fprintf(stdout, "%d",offset->v.i);
break;
case en_labcon:
fprintf(output,"L%04d",offset->v.i);
if( echo ) fprintf(stdout,"L%04d",offset->v.i);
break;
case en_nacon:
fprintf(output,"%s",offset->v.p[0]);
if( echo ) fprintf(stdout,"%s",offset->v.p[0]);
break;
case en_add:
putconst(offset->v.p[0]);
fprintf(output,"+");
if(echo) fprintf(stdout, "+");
putconst(offset->v.p[1]);
break;
case en_sub:
putconst(offset->v.p[0]);
fprintf(output,"-");
if( echo ) fprintf(stdout,"-");
putconst(offset->v.p[1]);
break;
case en_uminus:
fprintf(output,"-");
if(echo) fprintf(stdout,"-");
putconst(offset->v.p[0]);
break;
default:
printf("DIAG - illegal constant node.\n");
break;
}
}
putlen(l) /* append the length field to an instruction. */
int l;
{ switch( l )
{
case 0:
break; /* no length field */
case 1:
fprintf(output,".b");
if( echo ) fprintf(stdout,".b");
break;
case 2:
fprintf(output,".w");
if(echo) fprintf(stdout,".w");
break;
case 4:
fprintf(output,".l");
if(echo) fprintf(stdout,".l");
break;
default:
printf("DIAG - illegal length field.\n");
break;
}
}
putamode(ap) /* output a general addressing mode. */
struct amode *ap;
{ switch( ap->mode )
{
case am_immed:
fprintf(output,"#");
if(echo) fprintf(stdout,"#");
case am_direct:
putconst(ap->offset);
break;
case am_areg:
fprintf(output,"A%d",ap->preg);
if( echo) fprintf(stdout,"A%d",ap->preg);
break;
case am_dreg:
fprintf(output,"D%d",ap->preg);
if(echo) fprintf(stdout,"D%d",ap->preg);
break;
case am_ind:
fprintf(output,"(A%d)",ap->preg);
if(echo) fprintf(stdout,"(A%d)",ap->preg);
break;
case am_ainc:
fprintf(output,"(A%d)+",ap->preg);
if(echo) fprintf(stdout,"(A%d)+",ap->preg);
break;
case am_adec:
fprintf(output,"-(A%d)",ap->preg);
if(echo) fprintf(stdout,"-(A%d)",ap->preg);
break;
case am_indx:
putconst(ap->offset);
fprintf(output,"(A%d)",ap->preg);
if(echo) fprintf(stdout,"(A%d)",ap->preg);
break;
case am_xpc:
putconst(ap->offset);
fprintf(output,"(PC,D%d)",ap->preg);
if(echo) fprintf(stdout,"(PC,D%d)",ap->preg);
break;
case am_indx2:
putconst(ap->offset);
fprintf(output,"(A%d,D%d.l)",ap->preg,ap->sreg);
if(echo) fprintf(stdout,"(A%d,D%d.l)",ap->preg,ap->sreg);
break;
case am_indx3:
putconst(ap->offset);
fprintf(output,"(A%d,A%d.l)",ap->preg,ap->sreg);
if(echo) fprintf(stdout,"(A%d,A%d.l)",ap->preg,ap->sreg);
break;
case am_mask:
put_mask(ap->offset);
break;
default:
printf("DIAG - illegal address mode.\n");
break;
}
}
put_code(op,len,aps,apd) /* output a generic instruction. */
struct amode *aps, *apd;
int op, len;
{ if( op == op_dc )
{
switch( len )
{
case 1: fprintf(output,"\tdc.b");
if(echo) fprintf(stdout,"\tdc.b");
break;
case 2: fprintf(output,"\tdc.w");
if( echo ) fprintf(stdout,"\tdc.w");
break;
case 4: fprintf(output,"\tdc.l");
if( echo ) fprintf(stdout,"\tdc.l");
break;
}
}
else
{
putop(op);
putlen(len);
}
if( aps != 0 )
{
fprintf(output,"\t");
if(echo) fprintf(stdout,"\t");
putamode( aps );
if( apd != 0 )
{
fprintf(output,",");
if(echo) fprintf(stdout,",");
putamode( apd );
}
}
fprintf(output,"\n");
if(echo) fprintf(stdout,"\n");
}
put_mask(mask) /* generate a register mask for restore and save. */
int mask;
{
unsigned int i, position = 15;
static int mswitch = 0;
char *reglist[] = { "A7","A6","A5","A4","A3","A2","A1","A0",
"D7","D6","D5","D4","D3","D2","D1","D0" };
i = mask;
if( mswitch == 1) position = 0;
while( i >= 1 ) {
if( (i & 1) == 1 ) fprintf(output, "%s/", reglist[position]);
i = i >> 1;
if( mswitch == 1 ) position++; else position--;
}
if( mswitch == 1) mswitch = 0; else mswitch = 1;
}
putreg(r) /* generate a register name from a tempref number. */
int r;
{
if( r < 8 )
{
fprintf(output,"D%d",r);
if(echo) fprintf(stdout,"D%d",r);
}
else
{
fprintf(output,"A%d",r - 8);
if(echo) fprintf(stdout,"A%d",r-8);
}
}
gen_strlab(s) /* generate a named label. */
char *s;
{
fprintf(output,"%s",s);
if( echo ) fprintf(stdout,"%s",s);
}
put_label(lab) /* output a compiler generated label. */
int lab;
{
fprintf(output,"L%04d\n",lab);
if(echo) fprintf(stdout,"L%04d\n",lab);
}
genbyte(val)
int val;
{ if( gentype == bytegen && outcol < 30) {
fprintf(output,",%d",val & 0x00ff);
if(echo) fprintf(stdout,",%d",val & 0x00ff);
outcol += 4;
}
else {
nl();
fprintf(output,"\tDC.B\t%d",val & 0x00ff);
if( echo) fprintf(stdout,"\tDC.B\t%d",val & 0x00ff);
gentype = bytegen;
outcol = 19;
}
}
genword(val)
int val;
{ if( gentype == wordgen && outcol < 29) {
fprintf(output,",%d",val & 0x0ffff);
if(echo) fprintf(stdout,",%d",val & 0x0ffff);
outcol += 6;
}
else {
nl();
fprintf(output,"\tDC.W\t%d",val & 0x0ffff);
if(echo) fprintf(stdout,"\tDC.W\t%d",val & 0x0ffff);
gentype = wordgen;
outcol = 21;
}
}
genlong(val)
int val;
{ if( gentype == longgen && outcol < 28) {
fprintf(output,",%d",val);
if(echo) fprintf(stdout,",%d",val);
outcol += 10;
}
else {
nl();
fprintf(output,"\tDC.L\t%d",val);
if(echo) fprintf(stdout,"\tDC.L\t%d",val);
gentype = longgen;
outcol = 25;
}
}
genref(sp,offset)
SYM *sp;
int offset;
{ char sign;
if( offset < 0) {
sign = '-';
offset = -offset;
}
else
sign = '+';
if( gentype == longgen && outcol < 55 - strlen(sp->name)) {
if( sp->storage_class == sc_static)
{
fprintf(output,",L%04d%c%d",sp->value.i,sign,offset);
if(echo) fprintf(stdout,",L%04d%c%d",sp->value.i,sign,offset);
}
else
{
fprintf(output,",%s%c%d",sp->name,sign,offset);
if(echo) fprintf(stdout,",%s%c%d",sp->name,sign,offset);
}
outcol += (11 + strlen(sp->name));
}
else {
nl();
if(sp->storage_class == sc_static)
{
fprintf(output,"\tlong\tL%04d%c%d",sp->value.i,sign,offset);
if(echo) fprintf(stdout,"\tlong\tL%04d%c%d",sp->value.i,sign,offset);
}
else
{
fprintf(output,"\tlong\t%s%c%d",sp->name,sign,offset);
if(echo) fprintf(stdout,"\tlong\t%s%c%d",sp->name,sign,offset);
}
outcol = 26 + strlen(sp->name);
gentype = longgen;
}
}
genstorage(nbytes)
int nbytes;
{ nl();
fprintf(output,"\tDS \t%d\n",nbytes);
if(echo) fprintf(stdout,"\tDS \t%d\n",nbytes);
}
gen_labref(n)
int n;
{ if( gentype == longgen && outcol < 58) {
fprintf(output,",L%04d",n);
if( echo ) fprintf(stdout,",L%04d",n);
outcol += 6;
}
else {
nl();
fprintf(output,"\tlong\tL%04d",n);
if(echo) fprintf(stdout,"\tlong\tL%04d",n);
outcol = 22;
gentype = longgen;
}
}
int stringlit(s) /* make s a string literal and return it's label number. */
char *s;
{ struct slit *lp;
++global_flag; /* always allocate from global space. */
lp = xalloc(sizeof(struct slit));
lp->label = nextlabel++;
lp->str = litlate(s);
lp->next = strtab;
strtab = lp;
--global_flag;
return lp->label;
}
dumplits() /* dump the string literal pool. */
{ char *cp;
while( strtab != 0) {
cseg();
nl();
put_label(strtab->label);
cp = strtab->str;
while(*cp)
genbyte(*cp++);
genbyte(0);
strtab = strtab->next;
}
nl();
}
nl()
{ if(outcol > 0) {
fprintf(output,"\n");
if(echo) fprintf(stdout,"\n");
outcol = 0;
gentype = nogen;
}
}
cseg()
{ if( curseg != codeseg) {
nl();
fprintf(output,"\n*\ttext\n");
if(echo) fprintf(stdout,"\n*\ttext\n");
curseg = codeseg;
}
}
dseg()
{ if( curseg != dataseg) {
nl();
fprintf(output,"*\tdata\t2\n");
if(echo) fprintf(stdout,"*\tdata\t2\n");
curseg = dataseg;
}
}