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/*
 * This file contains a number of small, machine dependent output
 * routines called from the main code output routines in 'out.c'.
 * Most have something to do with function calls and argument lists.
 */
#ifdef   vax
#include "INC$LIB:cc1.h"
#else
#include "cc1.h"
#endif

/*
 * Output a call.
 * Make the left subtree (the name) addressable if required.
 * Take a quick look to see if the semantics of the indirect call will work.
 * If this is not an indirect call (iflag==0), then the "nsef" flag is set
 * in the call to "genadr", to supress the generation of escape prefix bytes.
 */
outcall(tp, cxt, lab)
register TREE *tp;
{
	register int	nb;
	register int	iflag;
	register int	isalien;
	register int	isptr;
	register int	type;

	isalien = 0;
	if (isvariant(VALIEN)) {
		if (tp->t_lp->t_op == GID && tp->t_lp->t_seg == SALIEN) {
			++isalien;
			type = tp->t_type;
			isptr = ispoint(type);
			/* Adjust types not adjusted in parser. */
			if (type == S8)
				tp->t_type = S16;
			else if (type == U8)
				tp->t_type = U16;
#if !OMF286
			callfixup(tp->t_lp);
#endif
		}
	}
	if (isalien) {
		genr(ZPUSH, A_RSI);
		genr(ZPUSH, A_RDI);
		if (isvariant(VSMALL))
			genr(ZPUSH, A_RES);
	}
	nb = outargs(tp->t_rp, isalien);
	iflag = 0;
	tp = tp->t_lp;
	if (tp->t_op == STAR) {
		iflag = 1;
		tp = tp->t_lp;
		if (!isadr(tp->t_flag)) {
			while (tp->t_op == LEAF)
				tp = tp->t_lp;
			outofs(tp);
		}
	}
	outopcall(iflag);
	genadr(tp, iflag==0, 0, NULL);
	if (isalien) {
		if (isptr) {
			genrr(ZMOV, A_RAX, A_RBX);
#if !ONLYSMALL
			if (isvariant(VLARGE))
				genrr(ZMOV, A_RDX, A_RES);
#endif
		}
		if (type == S8) {
			bput(CODE); bput(ZCBW);
		}
		else if (type == U8)
			genrr(ZSUBB, A_RAH, A_RAH);
		if (isvariant(VSMALL))
			genr(ZPOP, A_RES);
		genr(ZPOP, A_RDI);
		genr(ZPOP, A_RSI);
	} else if (nb != 0)
		genri(ZADD, A_RSP, nb);
}

#if !OMF286
/* Remove the trailing '_' appended to GID's by cc0, for alien call. */
callfixup(tp)
TREE *tp;
{
	register char *cp1, *cp2;

	cp1 = tp->t_sp->s_id;
	cp2 = id;
	while (*cp2++ = *cp1++)
		;
	cp2[-2] = 0;
	tp->t_sp = gidpool(id);
}
#endif

/*
 * Output the argument list of a function.
 * The arguments are moved to the stack right to left.
 * Structure arguments, marked by a PTB type, get block moved into place.
 * If the function is "alien" we push in the opposite order.
 */
outargs(atp, isalien)
TREE *atp;
{
	register TREE *tp;
	register s, n;
	TYPE type;

	if ((tp=atp) == NULL)
		return (0);
	if (tp->t_op == ARGLST) {
		s = 0;
		if (isalien)
			s += outargs(tp->t_lp, isalien);
		s += outargs(tp->t_rp, isalien);
		if ( ! isalien)
			s += outargs(tp->t_lp, isalien);
		return (s);
	}
#if !ONLYSMALL
	if ((type=tp->t_type)==LPTB || type==SPTB) {
#else
	if ((type=tp->t_type) == SPTB) {
#endif
		n = s = tp->t_size;
		if (isvariant(VALIGN))
			n = (s+1)&~01;
		if (n != 0) {
			if (isvariant(V80186)) {
				genri(ZSUB, A_RSP, n);
				geni(ZPUSH, s);
			} else {
				if (s == n) {
					genri(ZMOV, A_RAX, s);
					genrr(ZSUB, A_RSP, A_RAX);
				} else {
					genri(ZSUB, A_RSP, n);
					genri(ZMOV, A_RAX, s);
				}
				genr(ZPUSH, A_RAX);
			}
			output(tp, MFNARG, 0, 0);
#if !ONLYSMALL
			if (type == LPTB) {
				genr(ZPUSH, A_RSS);
				genrr(ZMOV, A_RAX, A_RSP);
				genri(ZADD, A_RAX, 8);
				genr(ZPUSH, A_RAX);
				geng(ZXCALL, "blkmv");
				genri(ZADD, A_RSP, 10);
			} else {
#endif
				genrr(ZMOV, A_RAX, A_RSP);
				genri(ZADD, A_RAX, 4);
				genr(ZPUSH, A_RAX);
				geng(ZCALL, "blkmv");
				genri(ZADD, A_RSP, 6);
#if !ONLYSMALL
			}
#endif
		}
		return (n);
	}
	output(tp, MFNARG, 0, 0);
	return (pertype[type].p_size);
}

/*
 * This routine does the work of the [TLOP0], [TLOP1] and [TLOP2] macros.
 * It is given an opcode and returns the opcode that is used.
 */
maptype(opvariant, opcode, tp)
int		opvariant;
register int	opcode;
register TREE	*tp;
{
	if (opvariant == M_TL)
		tp = tp->t_lp;
	else if (opvariant == M_TR)
		tp = tp->t_rp;
	else if (opvariant != M_TN)
		return (opcode);
	if (isbyte(tp->t_type)) {
		if (opcode == ZADD)
			opcode = ZADDB;
		if (opcode == ZSUB)
			opcode = ZSUBB;
		if (opcode == ZINC)
			opcode = ZINCB;
		if (opcode == ZDEC)
			opcode = ZDECB;
	}
	return (opcode);
}

/*
 * This routine does the ZLDES opcode mapping.
 */
mapzldes(tp)
register TREE	*tp;
{
	if (hihalf(tp->t_treg) == DS)
		return (ZLDS);
	else if (hihalf(tp->t_treg) == ES)
		return (ZLES);
	else
		cbotch("ldes");
}

/*
 * Emit call opcode.
 */
outopcall(iflag)
{
	register op;

#if !ONLYSMALL
	if (notvariant(VSMALL)) {
		op = ZXCALL;
		if (iflag)
			op = ZIXCALL;
	} else {
#endif
		op = ZCALL;
		if (iflag)
			op = ZICALL;
#if !ONLYSMALL
	}
#endif
	bput(CODE);
	bput(op);
}

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