/*

 * Copyright 2008-2009 Katholieke Universiteit Leuven

 *

 * Use of this software is governed by the MIT license

 *

 * Written by Sven Verdoolaege, K.U.Leuven, Departement

 * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium

 */

#include <string.h>

#include <isl_ctx_private.h>

#include <isl_id_private.h>

#undef BASE

#define BASE id

#include <isl_list_templ.c>

/* A special, static isl_id to use as domains (and ranges)

 * of sets and parameters domains.

 * The user should never get a hold on this isl_id.

 */

isl_id isl_id_none = {

	.ref = -1,

	.ctx = NULL,

	.name = "#none",

	.user = NULL

};

isl_ctx *isl_id_get_ctx(__isl_keep isl_id *id)

{

	return id ? id->ctx : NULL;

}

void *isl_id_get_user(__isl_keep isl_id *id)

{

	return id ? id->user : NULL;

}

const char *isl_id_get_name(__isl_keep isl_id *id)

{

	return id ? id->name : NULL;

}

static __isl_give isl_id *id_alloc(isl_ctx *ctx, const char *name, void *user)

{

	const char *copy = name ? strdup(name) : NULL;

	isl_id *id;

	if (name && !copy)

		return NULL;

	id = isl_calloc_type(ctx, struct isl_id);

	if (!id)

		goto error;

	id->ctx = ctx;

	isl_ctx_ref(id->ctx);

	id->ref = 1;

	id->name = copy;

	id->user = user;

	id->hash = isl_hash_init();

	if (name)

		id->hash = isl_hash_string(id->hash, name);

	else

		id->hash = isl_hash_builtin(id->hash, user);

	return id;

error:

	free((char *)copy);

	return NULL;

}

uint32_t isl_id_get_hash(__isl_keep isl_id *id)

{

	return id ? id->hash : 0;

}

struct isl_name_and_user {

	const char *name;

	void *user;

};

static int isl_id_has_name_and_user(const void *entry, const void *val)

{

	isl_id *id = (isl_id *)entry;

	struct isl_name_and_user *nu = (struct isl_name_and_user *) val;

	if (id->user != nu->user)

		return 0;

	if (!id->name && !nu->name)

		return 1;

	return !strcmp(id->name, nu->name);

}

__isl_give isl_id *isl_id_alloc(isl_ctx *ctx, const char *name, void *user)

{

	struct isl_hash_table_entry *entry;

	uint32_t id_hash;

	struct isl_name_and_user nu = { name, user };

	if (!ctx)

		return NULL;

	id_hash = isl_hash_init();

	if (name)

		id_hash = isl_hash_string(id_hash, name);

	else

		id_hash = isl_hash_builtin(id_hash, user);

	entry = isl_hash_table_find(ctx, &ctx->id_table, id_hash,

					isl_id_has_name_and_user, &nu, 1);

	if (!entry)

		return NULL;

	if (entry->data)

		return isl_id_copy(entry->data);

	entry->data = id_alloc(ctx, name, user);

	if (!entry->data)

		ctx->id_table.n--;

	return entry->data;

}

/* If the id has a negative refcount, then it is a static isl_id

 * which should not be changed.

 */

__isl_give isl_id *isl_id_copy(isl_id *id)

{

	if (!id)

		return NULL;

	if (id->ref < 0)

		return id;

	id->ref++;

	return id;

}

/* Compare two isl_ids.

 *

 * The order is fairly arbitrary.  We do keep the comparison of

 * the user pointers as a last resort since these pointer values

 * may not be stable across different systems or even different runs.

 */

int isl_id_cmp(__isl_keep isl_id *id1, __isl_keep isl_id *id2)

{

	if (id1 == id2)

		return 0;

	if (!id1)

		return -1;

	if (!id2)

		return 1;

	if (!id1->name != !id2->name)

		return !id1->name - !id2->name;

	if (id1->name) {

		int cmp = strcmp(id1->name, id2->name);

		if (cmp != 0)

			return cmp;

	}

	if (id1->user < id2->user)

		return -1;

	else

		return 1;

}

static int isl_id_eq(const void *entry, const void *name)

{

	return entry == name;

}

uint32_t isl_hash_id(uint32_t hash, __isl_keep isl_id *id)

{

	if (id)

		isl_hash_hash(hash, id->hash);

	return hash;

}

/* Replace the free_user callback by "free_user".

 */

__isl_give isl_id *isl_id_set_free_user(__isl_take isl_id *id,

	__isl_give void (*free_user)(void *user))

{

	if (!id)

		return NULL;

	id->free_user = free_user;

	return id;

}

/* If the id has a negative refcount, then it is a static isl_id

 * and should not be freed.

 */

__isl_null isl_id *isl_id_free(__isl_take isl_id *id)

{

	struct isl_hash_table_entry *entry;

	if (!id)

		return NULL;

	if (id->ref < 0)

		return NULL;

	if (--id->ref > 0)

		return NULL;

	entry = isl_hash_table_find(id->ctx, &id->ctx->id_table, id->hash,

					isl_id_eq, id, 0);

	if (!entry)

		isl_die(id->ctx, isl_error_unknown,

			"unable to find id", (void)0);

	else

		isl_hash_table_remove(id->ctx, &id->ctx->id_table, entry);

	if (id->free_user)

		id->free_user(id->user);

	free((char *)id->name);

	isl_ctx_deref(id->ctx);

	free(id);

	return NULL;

}

__isl_give isl_printer *isl_printer_print_id(__isl_take isl_printer *p,

	__isl_keep isl_id *id)

{

	if (!id)

		goto error;

	if (id->name)

		p = isl_printer_print_str(p, id->name);

	if (id->user) {

		char buffer[50];

		snprintf(buffer, sizeof(buffer), "@%p", id->user);

		p = isl_printer_print_str(p, buffer);

	}

	return p;

error:

	isl_printer_free(p);

	return NULL;

}