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/*

 * Copyright (c) 2002-2005 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.

*/

#include "config.h"

#include "types.h"

#include "alignment.h"

#include "check.h"

#include "node.h"

#include "shape.h"

#include "table.h"

#include "tdf.h"

#include "utility.h"

/*

    BASIC ALIGNMENTS

    These are the basic alignments from the TDF specification.

*/

node *al_code = null;

node *al_frame =  null;

node *al_alloca = null;

node *al_var_param = null;

node *al_top =  null;

static node *al_offset = null;

static node *al_pointer = null;

static node *al_proc = null;

/*

    FIND THE ALIGNMENT OF A SHAPE

    For the node p, representing a shape or an alignment, this returns

    the alignment of p.

*/

node *

al_shape(node *p)

{

    node *q;

    sortname s;

    if (p == null) return(null);

    s = p->cons->sortnum;

    if (s == SORT_alignment) {

	switch (p->cons->encoding) {

	    case ENC_alignment: {

		return(al_shape(p->son));

	    }

	    case ENC_alignment_apply_token: {

		return(al_shape(expand_tok(p)));

	    }

	}

	return(copy_node(p));

    }

    if (s == SORT_shape) {

	switch (p->cons->encoding) {

	    case ENC_bottom: {

		is_fatal = 0;

		input_error("Can't have alignment of bottom in %s",

			      checking);

		return(null);

	    }

	    case ENC_offset: return(copy_node(al_offset));

	    case ENC_pointer: return(copy_node(al_pointer));

	    case ENC_proc: return(copy_node(al_proc));

	    case ENC_top: return(copy_node(al_top));

	    case ENC_nof: return(al_shape(p->son->bro));

	    case ENC_shape_apply_token: {

		return(al_shape(expand_tok(p)));

	    }

	}

    }

    q = new_node();

    q->cons = cons_no(SORT_alignment, ENC_alignment);

    q->son = copy_node(p);

    return(null);

}

/*

    FIND WHAT A POINTER POINTS TO

    For the node p of the form ( pointer a ) this routine returns a.

*/

node *

ptr_to(node *p)

{

    p = expand_tok(p);

    if (p && p->cons == cons_no(SORT_shape, ENC_pointer)) {

	return(p->son);

    }

    return(null);

}

/*

    FIND THE FIRST COMPONENT OF AN OFFSET

    For the node p of the form ( offset a b ) this routine returns a.

*/

node *

offset_from(node *p)

{

    p = expand_tok(p);

    if (p && p->cons == cons_no(SORT_shape, ENC_offset)) {

	return(p->son);

    }

    return(null);

}

/*

    FIND THE SECOND COMPONENT OF AN OFFSET

    For the node p of the form ( offset a b ) this routine returns b.

*/

node *

offset_to(node *p)

{

    p = expand_tok(p);

    if (p && p->cons == cons_no(SORT_shape, ENC_offset)) {

	return(p->son->bro);

    }

    return(null);

}

/*

    CHECK THAT TWO ALIGNMENTS ARE EQUAL

    This routine is not yet implemented.

*/

void

al_equals(node *p, node *q)

{

    UNUSED(p);

    UNUSED(q);

    return;

}

/*

    CHECK THAT ONE ALIGNMENT CONTAINS ANOTHER

    This routine is not yet implemented.

*/

void

al_includes(node *p, node *q)

{

    UNUSED(p);

    UNUSED(q);

    return;

}

/*

    FIND THE UNIONS OF TWO ALIGNMENTS

    The value of ( unite_alignments p q ) is returned.

*/

node *

al_union(node *p, node *q)

{

    if (p == null || p->cons->sortnum != SORT_alignment) return(null);

    if (q == null || q->cons->sortnum != SORT_alignment) return(null);

    if (p->cons->encoding == ENC_alignment &&

	 p->son->cons == cons_no(SORT_shape, ENC_top)) return(q);

    if (q->cons->encoding == ENC_alignment &&

	 q->son->cons == cons_no(SORT_shape, ENC_top)) return(p);

    return(null);

}

/*

    INITIALIZE BASIC ALIGNMENTS

    The basic alignments, al_top, al_offset, al_pointer and al_proc, are

    initialized.

*/

void

init_alignments(void)

{

    /* Set up al_top */

    al_top =  new_node();

    al_top->cons = cons_no(SORT_alignment, ENC_alignment);

    al_top->son = copy_node(sh_top);

    /* Set up al_offset */

    al_offset =  new_node();

    al_offset->cons = cons_no(SORT_alignment, ENC_alignment);

    al_offset->son = sh_offset(al_top, al_top);

    /* Set up al_pointer */

    al_pointer =  new_node();

    al_pointer->cons = cons_no(SORT_alignment, ENC_alignment);

    al_pointer->son = sh_pointer(al_top);

    /* Set up al_proc */

    al_proc =  new_node();

    al_proc->cons = cons_no(SORT_alignment, ENC_alignment);

    al_proc->son = copy_node(sh_proc);

    return;

}