outx86_s.c

一款拥有一定历史的C语言编译器

    case op_seta:
    case op_setae:
    case op_setl:
    case op_setle:
    case op_setg:
    case op_setge:
	len = IL0;
	break;
    case op_shl:
    case op_shr:
    case op_asl:
    case op_asr:
	len1 = IL1;
	break;
    case op_movsbw:
    case op_movzbw:
	len2 = IL2;
	/*lint -fallthrough */
    case op_movsbl:
    case op_movzbl:
	len1 = IL1;
	break;
    case op_movswl:
    case op_movzwl:
	len1 = IL2;
	break;
    default:
	break;
    }

    putop (ip->opcode);
    putlen (len);
    /*
     * Sun reverses the INTEL syntax:
     * The source comes first
     * The destination comes second
     * The imul instruction is special (3 operands), this
     * is handled here
     */
    if (ip->oper1 != NIL_ADDRESS) {
	oprintf ("\t");
	putamode (ip->oper1, len1);
	if (ip->oper2 != NIL_ADDRESS) {
	    if (ip->opcode == op_line) {
		oprintf ("%s%s>>>>\t", newline, comment);
	    } else {
		oprintf (", ");
	    }
	    putamode (ip->oper2, len2);
	    /*
	     * Assembler has strange syntax
	     */
	    if (ip->opcode == op_imul &&
		ip->oper1->mode == am_immed && ip->oper2->mode == am_dreg) {
		oprintf (", ");
		putamode (ip->oper2, len2);
	    }
	}
    }
    oprintf ("%s", newline);
}


/*
 * generate a named label.
 */
PRIVATE void put_name P1 (SYM *, sp)
{
    put_reference (sp);
    oprintf ("%s:%s", outlate (nameof (sp)), newline);
}

/*
 * output a compiler generated label.
 */
PRIVATE void put_label P1 (LABEL, lab)
{
    oprintf ("%s%u:%s", prefix, (unsigned int) lab, newline);
}

static void put_header P2 (enum e_gt, gtype, SIZE, al)
{
    static const char *directive[] = {
	".byte\t",		/* bytegen */
	".value\t",		/* wordgen */
	".long\t",		/* longgen */
	".long\t",		/* longlonggen */
    };

    if (gentype != gtype || outcol >= MAX_WIDTH) {
	put_align (al);
	gentype = gtype;
	outcol = 15;
	oprintf ("\t%s", directive[gtype]);
    } else {
	oprintf (",");
    }
}

PRIVATE void put_byte P1 (UVAL, val)
{
    put_header (bytegen, alignment_of_type (tp_char));
    oprintf ("0x%lx", val & OxffUL);
    outcol += 4;
}

PRIVATE void put_word P1 (UVAL, val)
{
    put_header (wordgen, alignment_of_type (tp_short));
    oprintf ("0x%lx", val & OxffffUL);
    outcol += 6;
}

PRIVATE void put_dword P1 (UVAL, val)
{
    put_header (longgen, alignment_of_type (tp_long));
    oprintf ("0x%lx", val);
    outcol += 10;
}

#ifndef FLOAT_BOOTSTRAP
#ifdef FLOAT_IEEE
/*
 * Generate IEEE single and double numbers
 */
PRIVATE void put_float P1 (const RVAL *, vp)
{
    unsigned long ul;

    ieee_single (vp, &ul);
    put_dword ((UVAL) ul);
}

PRIVATE void put_double P1 (const RVAL *, vp)
{
    unsigned long ul[2];

    ieee_double (vp, ul, FALSE);
    put_dword ((UVAL) ul[0]);
    put_dword ((UVAL) ul[1]);
}

PRIVATE void put_longdouble P1 (const RVAL *, vp)
{
    unsigned long ul[3];

    ieee_longdouble (vp, ul, FALSE);
    put_dword ((UVAL) ul[0]);
    put_dword ((UVAL) ul[1]);
    put_dword ((UVAL) ul[2]);
}

#endif /* FLOAT_IEEE */
#endif /* FLOAT_BOOTSTRAP */

#ifndef RELOC_BUG
PRIVATE void put_char P1 (const EXPR *, ep)
{
    put_header (bytegen, alignment_of_type (tp_char));
    putconst (ep);
    outcol += 10;
}

PRIVATE void put_short P1 (const EXPR *, ep)
{
    put_header (wordgen, alignment_of_type (tp_short));
    putconst (ep);
    outcol += 10;
}

#endif /* RELOC_BUG */

PRIVATE void put_long P1 (const EXPR *, ep)
{
    put_header (longgen, alignment_of_type (tp_long));
    putconst (ep);
    outcol += 10;
}

PRIVATE void put_longlong P1 (const EXPR *, ep)
{
    put_header (longlonggen, alignment_of_type (tp_longlong));
    putconst (ep);
    outcol += 10;
}

PRIVATE void put_pointer P1 (const EXPR *, ep)
{
    put_header ((tp_pointer->size == 2L ? wordgen : longgen),
		alignment_of_type (tp_pointer));
    putconst (ep);
    outcol += 10;
}

PRIVATE void put_storage P1 (const SYM *, sp)
{
    SIZE    size = typeof (sp)->size;

    put_bseg (alignment_of_type (typeof (sp)));
    if (is_static (sp)) {
	oprintf ("\t.lcomm\t%s%u,%ld%s", prefix, (unsigned) sp->value.l, size,
		 newline);
    } else {
	oprintf ("\t.comm\t%s,%ld%s", outlate (nameof (sp)), size, newline);
    }
}


/*
 * dump the string literal pool.
 * if we are producing single copies of strings (which should therefore
 * be read only we put them in the text segment - else in the data segment.
 */
PRIVATE void put_literals P0 (void)
{
    const CHAR *cp;
    size_t  len;

    if (lang_option == LANG_KANDR) {
	put_dseg (alignment_of_type (tp_char));
    } else {
	put_kseg (alignment_of_type (tp_char));
    }
    for (; strtab != NIL_STRING; strtab = strtab->next) {
	nl ();
	put_label (strtab->label);
	cp = strtab->str;
	for (len = strtab->len; len--;)
	    put_byte ((UVAL) *cp++);
	put_byte ((UVAL) Ox0UL);

    }
    nl ();
}

PRIVATE void put_reference P1 (SYM *, sp)
{
    if (!is_symbol_output (sp)) {
	switch (storageof (sp)) {
	case sc_global:
	    nl ();
	    oprintf (".globl\t%s%s", outlate (nameof (sp)), newline);
	    break;
	case sc_external:
	    nl ();
	    oprintf (".globl\t%s%s", outlate (nameof (sp)), newline);
	    break;
	default:
	    break;
	}
	symbol_output (sp);
    }
}

/* align the following data */
static void put_align P1 (SIZE, al)
{
    nl ();
    if (al > align_type) {
	switch (al) {
	case 0L:
	case 1L:
	    break;
	case 2L:
	case 4L:
	    oprintf ("\t.align\t%d%s", (int) al, newline);
	    break;
	default:
	    FATAL ((__FILE__, "put_align", "align %ld", al));
	}
    }
    align_type = al;
}

/*
 * output any function epilogue code
 */
PRIVATE void put_epilogue P2 (SYM *, sp, LABEL, label)
{
    sp = sp;			/* keep the compiler quiet */
    label = label;		/* keep the compiler quiet */
}

PRIVATE void nl P0 (void)
{
    if (outcol > 0) {
	oprintf ("%s", newline);
	gentype = nogen;
	outcol = 0;
    }
}

static void seg P3 (enum e_sg, segtype, const char *, segname, SIZE, al)
{
    nl ();
    if (curseg != segtype) {
	oprintf ("\t%s%s", segname, newline);
	curseg = segtype;
	align_type = 0L;
    }
    put_align (al);
}

PRIVATE void put_cseg P1 (SIZE, al)
{
    seg (codeseg, ".text", al);
}

PRIVATE void put_dseg P1 (SIZE, al)
{
    seg (dataseg, ".data", al);
}

static void put_bseg P1 (SIZE, al)
{
    put_dseg (al);
}

PRIVATE void put_kseg P1 (SIZE, al)
{
    if (IandD_option) {
	put_dseg (al);
    } else {
	put_cseg (al);
    }
}

PRIVATE void put_rseg P1 (SIZE, al)
{
    put_cseg (al);
}

PRIVATE void put_finish P0 (void)
{
}

PRIVATE void put_start P0 (void)
{
    oprintf ("%s Generated by %s (masm) %s from %s%s",
	     comment, PROGNAME, VERSION, in_file, newline);
    oprintf ("\t.file\t\"%s\"%s", in_file, newline);
    oprintf ("\t.version\t\"01.01\"%s", newline);
}

#ifdef MULTIPLE_ASSEMBLERS
struct funcs sysvx86_func = {
    put_code,
    put_name,
    put_label,
    put_byte,
    put_word,
    put_dword,
#ifndef RELOC_BUG
    put_char,
    put_short,
#endif				/* RELOC_BUG */
    put_long,
    put_longlong,
    put_pointer,
    put_storage,
    put_literals,
    put_finish,
    put_start,
    put_reference,
    put_epilogue,
    put_cseg,
    put_dseg,
    put_kseg,
    put_rseg, 
#ifndef FLOAT_BOOTSTRAP
#ifdef FLOAT_SUPPORT
	put_float,
    put_double,
    put_longdouble,
#endif	/* FLOAT_SUPPORT */
#endif	/* FLOAT_BOOTSTRAP */
    NULL
};

#endif /* MULTIPLE_ASSEMBLERS */
#endif /* TARGET_SYSV */
#endif /* INTEL */