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/*

 * Copyright (c) 2002-2006 The TenDRA Project <http://www.tendra.org/>.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. Neither the name of The TenDRA Project nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific, prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS

 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * $Id$

 */

/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

/**********************************************************************

$Author: pwe $

$Date: 1998/03/11 11:03:24 $

$Revision: 1.4 $

$Log: inline.c,v $

 * Revision 1.4  1998/03/11  11:03:24  pwe

 * DWARF optimisation info

 *

 * Revision 1.3  1998/02/18  11:22:11  pwe

 * test corrections

 *

 * Revision 1.2  1998/01/20  17:14:23  release

 * Parameter named 'formal' confused SCO cc.

 *

 * Revision 1.1.1.1  1998/01/17  15:55:47  release

 * First version to be checked into rolling release.

 *

 * Revision 1.5  1997/10/23  09:24:25  pwe

 * extra diags

 *

 * Revision 1.4  1997/08/23  13:24:09  pwe

 * no invert order, and NEWDIAGS inlining

 *

Revision 1.3  1997/03/20 17:05:12  currie

Dwarf2 diags

Revision 1.2  1997/02/18 12:56:28  currie

NEW DIAG STRUCTURE

Revision 1.1  1995/04/06 10:44:05  currie

Initial revision

***********************************************************************/

#include "config.h"

#include "common_types.h"

#include "exp.h"

#include "expmacs.h"

#include "check.h"

#include "tags.h"

#include "shapemacs.h"

#include "me_fns.h"

#include "externs.h"

#include "flags.h"

#ifdef NEWDIAGS

#include "dg_globs.h"

#include "dg_aux.h"

#endif

#include "inline.h"

/* PROCEDURES */

static exp

last_action(exp e)

{

	if (e == nilexp) {

		return e;

	}

	if (name(e) == ident_tag || name(e) == seq_tag) {

		return last_action(bro(son(e)));

	}

	return e;

}

static void

change_last_shapes(exp e, shape sha)

{

	if (e == nilexp) {

		return;

	}

	if (name(e) == ident_tag || name(e) == seq_tag) {

		sh(e) = sha;

		change_last_shapes(bro(son(e)), sha);

	}

	return;

}

/* replaces a formal paramter by an actual parameter */

static void

replace_pars(exp actual, exp formal_par)

{

	exp def;

	if (!last(actual)) {

		replace_pars(bro(actual), bro(son(formal_par)));

	}

	clearparam(formal_par);

	def = son(formal_par);

	if (no(formal_par) == 1 && shape_size(sh(pt(formal_par))) == 8) {

		setvis(formal_par);

	}

	replace(def, actual, formal_par);

	retcell(def);

	return;

}

/* inlines the procedure application e */

void

inline_exp(exp e)

{

	exp fn = son(e);	/* the name_tag for the function */

	exp pars = bro(fn);	/* the first actual parameter */

	exp body = son(son(son(fn)));	/* the proc_tag exp */

	exp bc, t, q;

	exp lab;

	exp var;		/* the destination to which the result is to be

				   assigned */

	exp new_var = nilexp;

	exp new_dec;		/* a new variable declaration if we make one */

	shape sha = sh(e);	/* the shape delivered by the application */

	exp cond_alt;

	exp res;

	exp last_act;

	if (name(sha) == tophd) {

		/* not returning a result, no ass needed */

		var = nilexp;

		cond_alt = f_make_top();

	} else {

		if (last(e) && name(bro(e)) == ass_tag &&

		    name(son(bro(e))) == name_tag) {

			/* the result of the application is being assigned to

			   a name_tag */

			var = son(bro(e));	/* the destination of the ass */

			cond_alt = f_make_top();	/* the result is being

							   assigned in the body

							   - no need for a

							   delivered result */

			e = bro(e); /* NOTE e CHANGED to ass_tag */

#ifdef NEWDIAGS

			if (diagnose) {

				/* bro(son(e)) is now the call */

				dg_whole_comp(e, bro(son(e)));

				dgf(e) = dgf(bro(son(e)));

			}

#endif

		} else {

			new_dec = me_start_clearvar(sha, sha);

			/* make a new variable to assign to at each res_tag */

			setinlined(new_dec);	/* mark the declaration */

			new_var = me_obtain(new_dec);

			var = new_var;	/* the destination of assignments

					   new_var is killed at end */

			cond_alt = f_contents(sha, copy(new_var));

			/* delivers the contents of the variable - hence the

			 * value */

		}

	}

	lab = me_b3(sh(cond_alt), me_shint(sha, 0), cond_alt, labst_tag);

	/* the labst for the new cond_tag we are making up */

	name(son(lab)) = clear_tag;

	t = fn;	  /* start t so that its bro is the first actual parameter */

	q = body; /* start q so that its son is the first formal parameter */

	while (!last(t)) {

		/* check actual and formal shapes */

		if (name(q) != ident_tag || !isparam(q)) {

			return;  /* no inline if more actuals than formals */

		}

		if (shape_size(sh(bro(t))) != shape_size(sh(son(q)))) {

			return;	/* no inlining if shapes do not match. */

		}

		t = bro(t);		/* next actual */

		q = bro(son(q));	/* next formal */

	}

	if (name(q) == ident_tag && isparam(q)) {

		return;  /* no inline if more formals than actuals */

	}

#ifdef NEWDIAGS

	doing_inlining = 1;

#endif

	bc = copy_res(body, var, lab);

	/* copy the body, making res_tag into assignment to var and

	   jump to lab */

#ifdef NEWDIAGS

	doing_inlining = 0;

#endif

	bc = hold(bc);

	/* if there are any parameters */

	if (!last(fn)) {

		/* replace formals by actuals */

		replace_pars(pars, son(bc));

	}

	IGNORE check(son(bc), son(bc));	/* check the result (proc_tag ?)*/

	res = son(bc); /* remove the proc_tag */

	retcell(bc);	/* and retcell it */

	last_act = last_action(res);

	if (no(son(lab)) == 1 && name(last_act) == goto_tag &&

	    pt(last_act) == lab) {

		/* there is only one (final) goto replacement for return */

		if (name(res) == goto_tag) {

			res = (name(sha) == tophd) ? f_make_top() :

				f_make_value(sha);

		} else {

			change_last_shapes(res, sh(bro(son(lab))));

#ifdef NEWDIAGS

			if (diagnose) {

				dg_whole_comp(last_act, bro(son(lab)));

			}

#endif

			replace(last_act, bro(son(lab)), res);

		}

	} else {

		res = me_b3(sh(lab), res, lab, cond_tag);

	}

	/* make up the cond out of the substituted exp and lab */

	if (var != nilexp) {

		kill_exp(var, var);

	}

	if (new_var != nilexp) { /* we made up a new variable */

		SET(new_dec);

		if (no(new_dec) != 1) {

			/* complete the variable def */

			res = me_complete_id(new_dec, res);

		} else {

			exp r = f_make_top();

#ifdef NEWDIAGS

			if (diagnose) {

				dgf(r) = dgf(bro(son(lab)));

			}

#endif

			replace(bro(son(lab)), r, r);

		}

	}

#ifdef NEWDIAGS

	if (diagnose) {

		dg_complete_inline(e, res);

	}

#endif

	replace(e, res, nilexp); /* replace the call by the inlined stuff */

	kill_exp(fn, fn);	 /* kill off the function name_tag */

	return;

}