/*
 * Copyright (c) 2002, The Tendra Project <http://www.ten15.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 unmodified, 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 *
 *
 *    		 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.
 *
 * $TenDRA: tendra/src/tools/tld/shape-table.c,v 1.10 2005/10/18 15:31:06 stefanf Exp $
 */


/*** shape-table.c --- Shape table ADT.
 *
 ** Author: Steve Folkes <smf@hermes.mod.uk>
 *
 *** Commentary:
 *
 * This file implements the shape table routines used by the TDF linker.
 *
 *** Change Log:*/

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

#include "shape-table.h"

#include "solve-cycles.h"

/*--------------------------------------------------------------------------*/

ShapeTableP
shape_table_create(void)
{
	ShapeTableP table = ALLOCATE (ShapeTableT);
	unsigned    i;

	for (i = 0; i < SHAPE_TABLE_SIZE; i ++) {
		table->contents [i] = NIL (ShapeEntryP);
	}
	table->token_entry = NIL (ShapeEntryP);
	table->tag_entry   = NIL (ShapeEntryP);
	return (table);
}

ShapeEntryP
shape_table_add(ShapeTableP table, NStringP key)
{
	unsigned     hash_value = (nstring_hash_value (key) % SHAPE_TABLE_SIZE);
	ShapeEntryP *entryp     = &(table->contents [hash_value]);
	ShapeEntryP  entry;

	while ((entry = *entryp) != NIL (ShapeEntryP)) {
		if (nstring_equal (key, shape_entry_key (entry))) {
			return (entry);
		}
		entryp = shape_entry_next_ref (entry);
	}
	entry   = shape_entry_create (key);
	*entryp = entry;
	return (entry);
}

ShapeEntryP
shape_table_get(ShapeTableP table, NStringP key)
{
	unsigned    hash_value = (nstring_hash_value (key) % SHAPE_TABLE_SIZE);
	ShapeEntryP entry      = (table->contents [hash_value]);

	while (entry) {
		if (nstring_equal (key, shape_entry_key (entry))) {
			return (entry);
		}
		entry = shape_entry_next (entry);
	}
	return (NIL (ShapeEntryP));
}

ShapeEntryP
shape_table_get_token_entry(ShapeTableP table)
{
	if (table->token_entry == NIL (ShapeEntryP)) {
		NStringT nstring;

		nstring_copy_cstring (&nstring, "token");
		table->token_entry = shape_table_get (table, &nstring);
		nstring_destroy (&nstring);
	}
	return (table->token_entry);
}

ShapeEntryP
shape_table_get_tag_entry(ShapeTableP table)
{
	if (table->tag_entry == NIL (ShapeEntryP)) {
		NStringT nstring;

		nstring_copy_cstring (&nstring, "tag");
		table->tag_entry = shape_table_get (table, &nstring);
		nstring_destroy (&nstring);
	}
	return (table->tag_entry);
}

void
shape_table_iter(ShapeTableP table, void (*proc)(ShapeEntryP, void *),
	void *closure)
{
	unsigned i;

	for (i = 0; i < SHAPE_TABLE_SIZE; i ++) {
		ShapeEntryP entry = (table->contents [i]);

		while (entry) {
			(*proc) (entry, closure);
			entry = shape_entry_next (entry);
		}
	}
}

void
shape_table_deallocate(ShapeTableP table)
{
	unsigned i;

	for (i = 0; i < SHAPE_TABLE_SIZE; i ++) {
		ShapeEntryP entry = (table->contents [i]);

		while (entry) {
			entry = shape_entry_deallocate (entry);
		}
	}
}