/*
 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
 * See the copyright notice in the ACK home directory, in the file "Copyright".
 */
#ifndef NORCSID
static char rcsid[] = "$Id$";
#endif

#include <assert.h>
#include "param.h"
#include "set.h"
#include "property.h"
#include "reg.h"
#include "token.h"
#include "varinfo.h"
#include "iocc.h"
#include "subr.h"
#include "hall.h"
#include "coerc.h"
#include <cgg_cg.h>
#include "pseudo.h"
#include "extern.h"

extern set_t l_sets[];

int nmoves;
move_t l_moves[MAXMOVES];
short posmoves[MAXREGS + MAXTOKENS][SETSIZE];

void n_split(int , int, struct varinfo *, struct varinfo *, struct varinfo *, int);

extern void dopattern(int stackcoerc, varinfo *kills, varinfo *allocates,
			varinfo *generates, varinfo *yields, varinfo *leaving);;

void n_move(int s1, int e1, int s2, int e2, struct varinfo *vi)
{
	register move_p mp;
	register int i, j;

	NEXT(nmoves, MAXMOVES, "Moves");
	mp = &l_moves[nmoves - 1];
	mp->m_set1 = s1;
	mp->m_expr1 = e1;
	mp->m_set2 = s2;
	mp->m_expr2 = e2;
	mp->m_cindex = codeindex;
	dopattern(0, VI_NULL, VI_NULL, vi, VI_NULL, VI_NULL);
	if (mp->m_expr1 != 0 || mp->m_expr2 != 0)
		return;
	for (i = 0; i < MAXREGS + MAXTOKENS; i++)
		if (BIT(l_sets[mp->m_set1].set_val, i))
			for (j = 0; j < SETSIZE; j++)
				posmoves[i][j] |= l_sets[mp->m_set2].set_val[j];
}

int existmove(iocc_t from, short *sp)
{
	register int i;

	for (i = 0; i < MAXREGS + MAXTOKENS; i++)
		if (BIT(from.in_set, i))
			if (!subset(sp, posmoves[i], SETSIZE))
				return (0);
	return (1);
}

int existalmove(iocc_t from, int prpno)
{
	short s[SETSIZE];
	register int i;

	for (i = 0; i < SETSIZE; i++)
		s[i] = i < SZOFSET(MAXREGS) ? l_props[prpno].pr_regset[i] : 0;
	return (existmove(from, s));
}

struct varinfo *gen_move(iocc_t from, iocc_t to)
{
	register struct varinfo *vp;

	if (existmove(from, to.in_set) == 0)
	{
		error("No such move defined");
		return (VI_NULL );
	}
	NEW(vp, struct varinfo);
	vp->vi_int[0] = INSMOVE;
	vp->vi_int[1] = from.in_index;
	vp->vi_int[2] = to.in_index;
	return (vp);
}

int ntests;
test_t l_tests[MAXTESTS];
short postests[SETSIZE];

void n_test(int s, int e, struct varinfo *vi)
{
	register test_p tp;
	register int i;

	NEXT(ntests, MAXTESTS, "Tests");
	tp = &l_tests[ntests - 1];
	tp->t_set = s;
	tp->t_expr = e;
	tp->t_cindex = codeindex;
	dopattern(0, VI_NULL, VI_NULL, vi, VI_NULL, VI_NULL);
	if (tp->t_expr != 0)
		return;
	for (i = 0; i < SETSIZE; i++)
		postests[i] |= l_sets[tp->t_set].set_val[i];
}

struct varinfo *gen_test(iocc_t from)
{
	register struct varinfo *vp;

	if (!subset(from.in_set, postests, SETSIZE))
	{
		error("No such test");
		return (0);
	}
	NEW(vp, struct varinfo);
	vp->vi_int[0] = INSTEST;
	vp->vi_int[1] = from.in_index;
	return (vp);
}

struct varinfo *gen_label(int arg)
{
	register struct varinfo *vp;

	NEW(vp, struct varinfo);
	vp->vi_int[0] = INSLABDEF;
	vp->vi_int[1] = arg;
	return (vp);
}

struct varinfo *gen_preturn(void)
{
	register struct varinfo *vp;

	NEW(vp, struct varinfo);
	vp->vi_int[0] = INSPRETURN;
	return (vp);
}

struct varinfo *gen_tlab(int n)
{
	register struct varinfo *vp;

	assert(n >= 0 && n <= 9);
	NEW(vp, struct varinfo);
	vp->vi_int[0] = INSTLAB;
	vp->vi_int[1] = n;
	return (vp);
}

int nstacks;
c1_t l_stacks[MAXSTACKS];
set_t ustackset, cstackset;

void n_stack(int s, int e, int p, struct varinfo *vi)
{
	register c1_p c1p;
	register short *sp;
	register int i;

	NEXT(nstacks, MAXSTACKS, "Stacks");
	c1p = &l_stacks[nstacks - 1];
	c1p->c1_texpno = s;
	c1p->c1_expr = e;
	c1p->c1_prop = p;
	c1p->c1_codep = codeindex;
	dopattern(0, VI_NULL, VI_NULL, vi, VI_NULL, VI_NULL);

	if (e == 0 && p == -1)
		sp = ustackset.set_val;
	else
		sp = cstackset.set_val;
	for (i = 0; i < SETSIZE; i++)
		sp[i] |= l_sets[s].set_val[i];
}

void checkstacking(register short *sp)
{
	register int i;
	register short *chkset;
	char *warn;

	if (subset(sp, ustackset.set_val, SETSIZE))
		return;
	chkset = ustackset.set_val;
	warn = "";
	for (i = 1; i < nregs; i++)
		if (BIT(sp,i) && !BIT(chkset, i))
			error("No %sstacking rule for register %s", warn,
					l_regs[i].ri_name);
	for (; i < nregs + MAXTOKENS; i++)
		if (BIT(sp,i) && !BIT(chkset, i))
			error("No %sstacking rule for token %s", warn,
					l_tokens[i - nregs]->tk_name);
}

int ncoercs;
c3_t l_coercs[MAXCOERCS];
set_t unstackset;

/*VARARGS5*/

void n_coerc(int ti, int be, struct varinfo *al, struct varinfo *ge, struct varinfo *rp, iocc_p inp)
{
	register c3_p c3p;
	register int i;
	register struct varinfo *vi;

	if (ti != 0)
	{
		for (i = 0, vi = rp; vi != 0; vi = vi->vi_next, i++)
			;
		if (i > 1)
		{
			n_split(ti, be, al, ge, rp, i);
			return;
		}
		else
		{
			if (i == 0)
			{
				error("Coercion should have a result!");
				return;
			}
		}
	}
	else
	{
		NEW(rp, struct varinfo);
		rp->vi_next = 0;
		rp->vi_int[0] = inp->in_index;
	}
	if (nallreg > 1)
		error("More than 1 register may not be allocated");
	NEXT(ncoercs, MAXCOERCS, "Coercions");
	c3p = &l_coercs[ncoercs - 1];
	c3p->c3_texpno = ti;
	c3p->c3_expr = be;
	c3p->c3_prop = nallreg == 0 ? -1 : allreg[0];
	c3p->c3_repl = rp->vi_int[0];
	c3p->c3_codep = codeindex;
	dopattern(ti == 0, VI_NULL, al, ge, rp, VI_NULL);
	if (ti == 0)
		for (i = 0; i < SETSIZE; i++)
			unstackset.set_val[i] |= inp->in_set[i];
	freevi(rp);
}

void checkunstacking(int setno)
{
	register short *sp;
	register int i;
	short hallset[SETSIZE];

	sp = l_sets[setno].set_val;
	for (i = 0; i < SETSIZE; i++)
		hallset[i] = sp[i] & unstackset.set_val[i];
	nexthall(hallset);
}

int nsplit, maxsplit;
c2_t l_split[MAXSPLCOERC];

void n_split(int ti, int be, struct varinfo *al, struct varinfo *ge, struct varinfo *rp, int n)
{
	register c2_p c2p;
	register int i;
	register struct varinfo *vi;

	NEXT(nsplit, MAXSPLCOERC, "Splitting coercions");
	c2p = &l_split[nsplit - 1];
	if (n > MAXSPLIT)
	{
		error("Maximum split factor is %d", MAXSPLIT);
		n = MAXSPLIT;
	}
	if (n > maxsplit)
		maxsplit = n;
	c2p->c2_texpno = ti;
	c2p->c2_expr = be;
	if (nallreg)
		error("No register uses allowed in splitting coercion");
	c2p->c2_nsplit = n;
	for (i = 0, vi = rp; i < n; i++, vi = vi->vi_next)
		c2p->c2_repl[i] = vi->vi_int[0];
	c2p->c2_codep = codeindex;
	dopattern(0, VI_NULL, al, ge, rp, VI_NULL);
}