[babeltrace.git] / lib / values.c

/*
 * Values.c: value objects
 *
 * Babeltrace Library
 *
 * Copyright (c) 2015 EfficiOS Inc. and Linux Foundation
 * Copyright (c) 2015 Philippe Proulx <pproulx@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#define BT_LOG_TAG "VALUES"
#include <babeltrace/lib-logging-internal.h>

#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <inttypes.h>
#include <babeltrace/compiler-internal.h>
#include <babeltrace/common-internal.h>
#include <babeltrace/object.h>
#include <babeltrace/values.h>
#include <babeltrace/private-values.h>
#include <babeltrace/compat/glib-internal.h>
#include <babeltrace/types.h>
#include <babeltrace/object-internal.h>
#include <babeltrace/values-internal.h>
#include <babeltrace/assert-internal.h>
#include <babeltrace/assert-pre-internal.h>

#define BT_VALUE_FROM_CONCRETE(_concrete) ((struct bt_value *) (_concrete))
#define BT_VALUE_TO_BOOL(_base) ((struct bt_value_bool *) (_base))
#define BT_VALUE_TO_INTEGER(_base) ((struct bt_value_integer *) (_base))
#define BT_VALUE_TO_REAL(_base) ((struct bt_value_real *) (_base))
#define BT_VALUE_TO_STRING(_base) ((struct bt_value_string *) (_base))
#define BT_VALUE_TO_ARRAY(_base) ((struct bt_value_array *) (_base))
#define BT_VALUE_TO_MAP(_base) ((struct bt_value_map *) (_base))

#define BT_ASSERT_PRE_VALUE_IS_TYPE(_value, _type)			\
	BT_ASSERT_PRE(((struct bt_value *) (_value))->type == (_type),	\
		"Value has the wrong type ID: expected-type=%s, "	\
		"%![value-]+v", bt_common_value_type_string(_type),	\
		(_value))

#define BT_ASSERT_PRE_VALUE_HOT(_value, _name)				\
	BT_ASSERT_PRE_HOT(((struct bt_value *) (_value)), (_name),	\
		": %!+v", (_value))

#define BT_ASSERT_PRE_VALUE_INDEX_IN_BOUNDS(_index, _count)		\
	BT_ASSERT_PRE((_index) < (_count),				\
		"Index is out of bound: "				\
		"index=%" PRIu64 ", count=%u", (_index), (_count));

struct bt_value {
	struct bt_object base;
	enum bt_value_type type;
	bt_bool frozen;
};

static
void bt_value_null_instance_release_func(struct bt_object *obj)
{
	BT_LOGW("Releasing the null value singleton: addr=%p", obj);
}

static
struct bt_value bt_value_null_instance = {
	.base = {
		.is_shared = true,
		.ref_count = 1,
		.release_func = bt_value_null_instance_release_func,
		.spec_release_func = NULL,
		.parent_is_owner_listener_func = NULL,
		.parent = NULL,
	},
	.type = BT_VALUE_TYPE_NULL,
	.frozen = BT_TRUE,
};

struct bt_value *bt_value_null = &bt_value_null_instance;
struct bt_private_value *bt_private_value_null =
	(void *) &bt_value_null_instance;

struct bt_value_bool {
	struct bt_value base;
	bt_bool value;
};

struct bt_value_integer {
	struct bt_value base;
	int64_t value;
};

struct bt_value_real {
	struct bt_value base;
	double value;
};

struct bt_value_string {
	struct bt_value base;
	GString *gstr;
};

struct bt_value_array {
	struct bt_value base;
	GPtrArray *garray;
};

struct bt_value_map {
	struct bt_value base;
	GHashTable *ght;
};

static
void bt_value_destroy(struct bt_object *obj);

static
void bt_value_string_destroy(struct bt_value *object)
{
	g_string_free(BT_VALUE_TO_STRING(object)->gstr, TRUE);
}

static
void bt_value_array_destroy(struct bt_value *object)
{
	/*
	 * Pointer array's registered value destructor will take care
	 * of putting each contained object.
	 */
	g_ptr_array_free(BT_VALUE_TO_ARRAY(object)->garray, TRUE);
}

static
void bt_value_map_destroy(struct bt_value *object)
{
	/*
	 * Hash table's registered value destructor will take care of
	 * putting each contained object. Keys are GQuarks and cannot
	 * be destroyed anyway.
	 */
	g_hash_table_destroy(BT_VALUE_TO_MAP(object)->ght);
}

static
void (* const destroy_funcs[])(struct bt_value *) = {
	[BT_VALUE_TYPE_NULL] =		NULL,
	[BT_VALUE_TYPE_BOOL] =		NULL,
	[BT_VALUE_TYPE_INTEGER] =	NULL,
	[BT_VALUE_TYPE_REAL] =		NULL,
	[BT_VALUE_TYPE_STRING] =	bt_value_string_destroy,
	[BT_VALUE_TYPE_ARRAY] =		bt_value_array_destroy,
	[BT_VALUE_TYPE_MAP] =		bt_value_map_destroy,
};

static
struct bt_private_value *bt_value_null_copy(const struct bt_value *null_obj)
{
	return (void *) bt_value_null;
}

static
struct bt_private_value *bt_value_bool_copy(const struct bt_value *bool_obj)
{
	return bt_private_value_bool_create_init(
		BT_VALUE_TO_BOOL(bool_obj)->value);
}

static
struct bt_private_value *bt_value_integer_copy(
		const struct bt_value *integer_obj)
{
	return bt_private_value_integer_create_init(
		BT_VALUE_TO_INTEGER(integer_obj)->value);
}

static
struct bt_private_value *bt_value_real_copy(const struct bt_value *real_obj)
{
	return bt_private_value_real_create_init(
		BT_VALUE_TO_REAL(real_obj)->value);
}

static
struct bt_private_value *bt_value_string_copy(const struct bt_value *string_obj)
{
	return bt_private_value_string_create_init(
		BT_VALUE_TO_STRING(string_obj)->gstr->str);
}

static
struct bt_private_value *bt_value_array_copy(const struct bt_value *array_obj)
{
	int i;
	int ret;
	struct bt_private_value *copy_obj;
	struct bt_value_array *typed_array_obj;

	BT_LOGD("Copying array value: addr=%p", array_obj);
	typed_array_obj = BT_VALUE_TO_ARRAY(array_obj);
	copy_obj = bt_private_value_array_create();
	if (!copy_obj) {
		BT_LOGE_STR("Cannot create empty array value.");
		goto end;
	}

	for (i = 0; i < typed_array_obj->garray->len; ++i) {
		struct bt_private_value *element_obj_copy = NULL;
		struct bt_value *element_obj =
			bt_value_array_borrow_element_by_index(
				array_obj, i);

		BT_ASSERT(element_obj);
		BT_LOGD("Copying array value's element: element-addr=%p, "
			"index=%d", element_obj, i);
		ret = bt_value_copy(&element_obj_copy, element_obj);
		if (ret) {
			BT_LOGE("Cannot copy array value's element: "
				"array-addr=%p, index=%d",
				array_obj, i);
			BT_OBJECT_PUT_REF_AND_RESET(copy_obj);
			goto end;
		}

		BT_ASSERT(element_obj_copy);
		ret = bt_private_value_array_append_element(copy_obj,
			(void *) element_obj_copy);
		BT_OBJECT_PUT_REF_AND_RESET(element_obj_copy);
		if (ret) {
			BT_LOGE("Cannot append to array value: addr=%p",
				array_obj);
			BT_OBJECT_PUT_REF_AND_RESET(copy_obj);
			goto end;
		}
	}

	BT_LOGD("Copied array value: original-addr=%p, copy-addr=%p",
		array_obj, copy_obj);

end:
	return copy_obj;
}

static
struct bt_private_value *bt_value_map_copy(const struct bt_value *map_obj)
{
	int ret;
	GHashTableIter iter;
	gpointer key, element_obj;
	struct bt_private_value *copy_obj;
	struct bt_private_value *element_obj_copy = NULL;
	struct bt_value_map *typed_map_obj;

	BT_LOGD("Copying map value: addr=%p", map_obj);
	typed_map_obj = BT_VALUE_TO_MAP(map_obj);
	copy_obj = bt_private_value_map_create();
	if (!copy_obj) {
		goto end;
	}

	g_hash_table_iter_init(&iter, typed_map_obj->ght);

	while (g_hash_table_iter_next(&iter, &key, &element_obj)) {
		const char *key_str = g_quark_to_string(GPOINTER_TO_UINT(key));

		BT_ASSERT(key_str);
		BT_LOGD("Copying map value's element: element-addr=%p, "
			"key=\"%s\"", element_obj, key_str);
		ret = bt_value_copy(&element_obj_copy, element_obj);
		if (ret) {
			BT_LOGE("Cannot copy map value's element: "
				"map-addr=%p, key=\"%s\"",
				map_obj, key_str);
			BT_OBJECT_PUT_REF_AND_RESET(copy_obj);
			goto end;
		}

		BT_ASSERT(element_obj_copy);
		ret = bt_private_value_map_insert_entry(copy_obj, key_str,
			(void *) element_obj_copy);
		BT_OBJECT_PUT_REF_AND_RESET(element_obj_copy);
		if (ret) {
			BT_LOGE("Cannot insert into map value: addr=%p, key=\"%s\"",
				map_obj, key_str);
			BT_OBJECT_PUT_REF_AND_RESET(copy_obj);
			goto end;
		}
	}

	BT_LOGD("Copied map value: addr=%p", map_obj);

end:
	return copy_obj;
}

static
struct bt_private_value *(* const copy_funcs[])(const struct bt_value *) = {
	[BT_VALUE_TYPE_NULL] =		bt_value_null_copy,
	[BT_VALUE_TYPE_BOOL] =		bt_value_bool_copy,
	[BT_VALUE_TYPE_INTEGER] =	bt_value_integer_copy,
	[BT_VALUE_TYPE_REAL] =		bt_value_real_copy,
	[BT_VALUE_TYPE_STRING] =	bt_value_string_copy,
	[BT_VALUE_TYPE_ARRAY] =		bt_value_array_copy,
	[BT_VALUE_TYPE_MAP] =		bt_value_map_copy,
};

static
bt_bool bt_value_null_compare(const struct bt_value *object_a,
		const struct bt_value *object_b)
{
	/*
	 * Always BT_TRUE since bt_value_compare() already checks if both
	 * object_a and object_b have the same type, and in the case of
	 * null value objects, they're always the same if it is so.
	 */
	return BT_TRUE;
}

static
bt_bool bt_value_bool_compare(const struct bt_value *object_a,
		const struct bt_value *object_b)
{
	if (BT_VALUE_TO_BOOL(object_a)->value !=
			BT_VALUE_TO_BOOL(object_b)->value) {
		BT_LOGV("Boolean value objects are different: "
			"bool-a-val=%d, bool-b-val=%d",
			BT_VALUE_TO_BOOL(object_a)->value,
			BT_VALUE_TO_BOOL(object_b)->value);
		return BT_FALSE;
	}

	return BT_TRUE;
}

static
bt_bool bt_value_integer_compare(const struct bt_value *object_a,
		const struct bt_value *object_b)
{
	if (BT_VALUE_TO_INTEGER(object_a)->value !=
			BT_VALUE_TO_INTEGER(object_b)->value) {
		BT_LOGV("Integer value objects are different: "
			"int-a-val=%" PRId64 ", int-b-val=%" PRId64,
			BT_VALUE_TO_INTEGER(object_a)->value,
			BT_VALUE_TO_INTEGER(object_b)->value);
		return BT_FALSE;
	}

	return BT_TRUE;
}

static
bt_bool bt_value_real_compare(const struct bt_value *object_a,
		const struct bt_value *object_b)
{
	if (BT_VALUE_TO_REAL(object_a)->value !=
			BT_VALUE_TO_REAL(object_b)->value) {
		BT_LOGV("Real number value objects are different: "
			"real-a-val=%f, real-b-val=%f",
			BT_VALUE_TO_REAL(object_a)->value,
			BT_VALUE_TO_REAL(object_b)->value);
		return BT_FALSE;
	}

	return BT_TRUE;
}

static
bt_bool bt_value_string_compare(const struct bt_value *object_a,
		const struct bt_value *object_b)
{
	if (strcmp(BT_VALUE_TO_STRING(object_a)->gstr->str,
			BT_VALUE_TO_STRING(object_b)->gstr->str) != 0) {
		BT_LOGV("String value objects are different: "
			"string-a-val=\"%s\", string-b-val=\"%s\"",
			BT_VALUE_TO_STRING(object_a)->gstr->str,
			BT_VALUE_TO_STRING(object_b)->gstr->str);
		return BT_FALSE;
	}

	return BT_TRUE;
}

static
bt_bool bt_value_array_compare(const struct bt_value *object_a,
		const struct bt_value *object_b)
{
	int i;
	bt_bool ret = BT_TRUE;
	const struct bt_value_array *array_obj_a =
		BT_VALUE_TO_ARRAY(object_a);

	if (bt_value_array_get_size(object_a) !=
			bt_value_array_get_size(object_b)) {
		BT_LOGV("Array values are different: size mismatch "
			"value-a-addr=%p, value-b-addr=%p, "
			"value-a-size=%" PRId64 ", value-b-size=%" PRId64,
			object_a, object_b,
			bt_value_array_get_size(object_a),
			bt_value_array_get_size(object_b));
		ret = BT_FALSE;
		goto end;
	}

	for (i = 0; i < array_obj_a->garray->len; ++i) {
		struct bt_value *element_obj_a;
		struct bt_value *element_obj_b;

		element_obj_a = bt_value_array_borrow_element_by_index(
			object_a, i);
		element_obj_b = bt_value_array_borrow_element_by_index(
			object_b, i);

		if (!bt_value_compare(element_obj_a, element_obj_b)) {
			BT_LOGV("Array values's elements are different: "
				"value-a-addr=%p, value-b-addr=%p, index=%d",
				element_obj_a, element_obj_b, i);
			ret = BT_FALSE;
			goto end;
		}
	}

end:
	return ret;
}

static
bt_bool bt_value_map_compare(const struct bt_value *object_a,
		const struct bt_value *object_b)
{
	bt_bool ret = BT_TRUE;
	GHashTableIter iter;
	gpointer key, element_obj_a;
	const struct bt_value_map *map_obj_a = BT_VALUE_TO_MAP(object_a);

	if (bt_value_map_get_size(object_a) !=
			bt_value_map_get_size(object_b)) {
		BT_LOGV("Map values are different: size mismatch "
			"value-a-addr=%p, value-b-addr=%p, "
			"value-a-size=%" PRId64 ", value-b-size=%" PRId64,
			object_a, object_b,
			bt_value_map_get_size(object_a),
			bt_value_map_get_size(object_b));
		ret = BT_FALSE;
		goto end;
	}

	g_hash_table_iter_init(&iter, map_obj_a->ght);

	while (g_hash_table_iter_next(&iter, &key, &element_obj_a)) {
		struct bt_value *element_obj_b;
		const char *key_str = g_quark_to_string(GPOINTER_TO_UINT(key));

		element_obj_b = bt_value_map_borrow_entry_value(object_b,
			key_str);

		if (!bt_value_compare(element_obj_a, element_obj_b)) {
			BT_LOGV("Map values's elements are different: "
				"value-a-addr=%p, value-b-addr=%p, key=\"%s\"",
				element_obj_a, element_obj_b, key_str);
			ret = BT_FALSE;
			goto end;
		}
	}

end:
	return ret;
}

static
bt_bool (* const compare_funcs[])(const struct bt_value *,
		const struct bt_value *) = {
	[BT_VALUE_TYPE_NULL] =		bt_value_null_compare,
	[BT_VALUE_TYPE_BOOL] =		bt_value_bool_compare,
	[BT_VALUE_TYPE_INTEGER] =	bt_value_integer_compare,
	[BT_VALUE_TYPE_REAL] =		bt_value_real_compare,
	[BT_VALUE_TYPE_STRING] =	bt_value_string_compare,
	[BT_VALUE_TYPE_ARRAY] =		bt_value_array_compare,
	[BT_VALUE_TYPE_MAP] =		bt_value_map_compare,
};

static
void bt_value_null_freeze(struct bt_value *object)
{
}

static
void bt_value_generic_freeze(struct bt_value *object)
{
	object->frozen = BT_TRUE;
}

static
void bt_value_array_freeze(struct bt_value *object)
{
	int i;
	struct bt_value_array *typed_array_obj =
		BT_VALUE_TO_ARRAY(object);

	for (i = 0; i < typed_array_obj->garray->len; ++i) {
		bt_value_freeze(g_ptr_array_index(typed_array_obj->garray, i));
	}

	bt_value_generic_freeze(object);
}

static
void bt_value_map_freeze(struct bt_value *object)
{
	GHashTableIter iter;
	gpointer key, element_obj;
	const struct bt_value_map *map_obj = BT_VALUE_TO_MAP(object);

	g_hash_table_iter_init(&iter, map_obj->ght);

	while (g_hash_table_iter_next(&iter, &key, &element_obj)) {
		bt_value_freeze(element_obj);
	}

	bt_value_generic_freeze(object);
}

static
void (* const freeze_funcs[])(struct bt_value *) = {
	[BT_VALUE_TYPE_NULL] =		bt_value_null_freeze,
	[BT_VALUE_TYPE_BOOL] =		bt_value_generic_freeze,
	[BT_VALUE_TYPE_INTEGER] =	bt_value_generic_freeze,
	[BT_VALUE_TYPE_REAL] =		bt_value_generic_freeze,
	[BT_VALUE_TYPE_STRING] =	bt_value_generic_freeze,
	[BT_VALUE_TYPE_ARRAY] =		bt_value_array_freeze,
	[BT_VALUE_TYPE_MAP] =		bt_value_map_freeze,
};

static
void bt_value_destroy(struct bt_object *obj)
{
	struct bt_value *value;

	value = container_of(obj, struct bt_value, base);
	BT_LOGD("Destroying value: addr=%p", value);

	if (bt_value_is_null(value)) {
		BT_LOGD_STR("Not destroying the null value singleton.");
		return;
	}

	if (destroy_funcs[value->type]) {
		destroy_funcs[value->type](value);
	}

	g_free(value);
}

BT_HIDDEN
enum bt_value_status _bt_value_freeze(struct bt_value *object)
{
	enum bt_value_status ret = BT_VALUE_STATUS_OK;

	BT_ASSERT(object);

	if (object->frozen) {
		goto end;
	}

	BT_LOGD("Freezing value: addr=%p", object);
	freeze_funcs[object->type](object);

end:
	return ret;
}

enum bt_value_type bt_value_get_type(const struct bt_value *object)
{
	BT_ASSERT_PRE_NON_NULL(object, "Value object");
	return object->type;
}

static
struct bt_value bt_value_create_base(enum bt_value_type type)
{
	struct bt_value value;

	value.type = type;
	value.frozen = BT_FALSE;
	bt_object_init_shared(&value.base, bt_value_destroy);
	return value;
}

struct bt_private_value *bt_private_value_bool_create_init(bt_bool val)
{
	struct bt_value_bool *bool_obj;

	BT_LOGD("Creating boolean value object: val=%d", val);
	bool_obj = g_new0(struct bt_value_bool, 1);
	if (!bool_obj) {
		BT_LOGE_STR("Failed to allocate one boolean value object.");
		goto end;
	}

	bool_obj->base = bt_value_create_base(BT_VALUE_TYPE_BOOL);
	bool_obj->value = val;
	BT_LOGD("Created boolean value object: addr=%p", bool_obj);

end:
	return (void *) BT_VALUE_FROM_CONCRETE(bool_obj);
}

struct bt_private_value *bt_private_value_bool_create(void)
{
	return bt_private_value_bool_create_init(BT_FALSE);
}

struct bt_private_value *bt_private_value_integer_create_init(int64_t val)
{
	struct bt_value_integer *integer_obj;

	BT_LOGD("Creating integer value object: val=%" PRId64, val);
	integer_obj = g_new0(struct bt_value_integer, 1);
	if (!integer_obj) {
		BT_LOGE_STR("Failed to allocate one integer value object.");
		goto end;
	}

	integer_obj->base = bt_value_create_base(BT_VALUE_TYPE_INTEGER);
	integer_obj->value = val;
	BT_LOGD("Created integer value object: addr=%p",
		integer_obj);

end:
	return (void *) BT_VALUE_FROM_CONCRETE(integer_obj);
}

struct bt_private_value *bt_private_value_integer_create(void)
{
	return bt_private_value_integer_create_init(0);
}

struct bt_private_value *bt_private_value_real_create_init(double val)
{
	struct bt_value_real *real_obj;

	BT_LOGD("Creating real number value object: val=%f", val);
	real_obj = g_new0(struct bt_value_real, 1);
	if (!real_obj) {
		BT_LOGE_STR("Failed to allocate one real number value object.");
		goto end;
	}

	real_obj->base = bt_value_create_base(BT_VALUE_TYPE_REAL);
	real_obj->value = val;
	BT_LOGD("Created real number value object: addr=%p",
		real_obj);

end:
	return (void *) BT_VALUE_FROM_CONCRETE(real_obj);
}

struct bt_private_value *bt_private_value_real_create(void)
{
	return bt_private_value_real_create_init(0.);
}

struct bt_private_value *bt_private_value_string_create_init(const char *val)
{
	struct bt_value_string *string_obj = NULL;

	if (!val) {
		BT_LOGW_STR("Invalid parameter: value is NULL.");
		goto end;
	}

	BT_LOGD("Creating string value object: val-len=%zu", strlen(val));
	string_obj = g_new0(struct bt_value_string, 1);
	if (!string_obj) {
		BT_LOGE_STR("Failed to allocate one string object.");
		goto end;
	}

	string_obj->base = bt_value_create_base(BT_VALUE_TYPE_STRING);
	string_obj->gstr = g_string_new(val);
	if (!string_obj->gstr) {
		BT_LOGE_STR("Failed to allocate a GString.");
		g_free(string_obj);
		string_obj = NULL;
		goto end;
	}

	BT_LOGD("Created string value object: addr=%p",
		string_obj);

end:
	return (void *) BT_VALUE_FROM_CONCRETE(string_obj);
}

struct bt_private_value *bt_private_value_string_create(void)
{
	return bt_private_value_string_create_init("");
}

struct bt_private_value *bt_private_value_array_create(void)
{
	struct bt_value_array *array_obj;

	BT_LOGD_STR("Creating empty array value object.");
	array_obj = g_new0(struct bt_value_array, 1);
	if (!array_obj) {
		BT_LOGE_STR("Failed to allocate one array object.");
		goto end;
	}

	array_obj->base = bt_value_create_base(BT_VALUE_TYPE_ARRAY);
	array_obj->garray = bt_g_ptr_array_new_full(0,
		(GDestroyNotify) bt_object_put_ref);
	if (!array_obj->garray) {
		BT_LOGE_STR("Failed to allocate a GPtrArray.");
		g_free(array_obj);
		array_obj = NULL;
		goto end;
	}

	BT_LOGD("Created array value object: addr=%p",
		array_obj);

end:
	return (void *) BT_VALUE_FROM_CONCRETE(array_obj);
}

struct bt_private_value *bt_private_value_map_create(void)
{
	struct bt_value_map *map_obj;

	BT_LOGD_STR("Creating empty map value object.");
	map_obj = g_new0(struct bt_value_map, 1);
	if (!map_obj) {
		BT_LOGE_STR("Failed to allocate one map object.");
		goto end;
	}

	map_obj->base = bt_value_create_base(BT_VALUE_TYPE_MAP);
	map_obj->ght = g_hash_table_new_full(g_direct_hash, g_direct_equal,
		NULL, (GDestroyNotify) bt_object_put_ref);
	if (!map_obj->ght) {
		BT_LOGE_STR("Failed to allocate a GHashTable.");
		g_free(map_obj);
		map_obj = NULL;
		goto end;
	}

	BT_LOGD("Created map value object: addr=%p",
		map_obj);

end:
	return (void *) BT_VALUE_FROM_CONCRETE(map_obj);
}

bt_bool bt_value_bool_get(const struct bt_value *bool_obj)
{
	BT_ASSERT_PRE_NON_NULL(bool_obj, "Value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(bool_obj, BT_VALUE_TYPE_BOOL);
	return BT_VALUE_TO_BOOL(bool_obj)->value;
}

void bt_private_value_bool_set(struct bt_private_value *bool_obj, bt_bool val)
{
	BT_ASSERT_PRE_NON_NULL(bool_obj, "Value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(bool_obj, BT_VALUE_TYPE_BOOL);
	BT_ASSERT_PRE_VALUE_HOT(bool_obj, "Value object");
	BT_VALUE_TO_BOOL(bool_obj)->value = val;
	BT_LOGV("Set boolean value's raw value: value-addr=%p, value=%d",
		bool_obj, val);
}

int64_t bt_value_integer_get(const struct bt_value *integer_obj)
{
	BT_ASSERT_PRE_NON_NULL(integer_obj, "Value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(integer_obj, BT_VALUE_TYPE_INTEGER);
	return BT_VALUE_TO_INTEGER(integer_obj)->value;
}

void bt_private_value_integer_set(struct bt_private_value *integer_obj,
		int64_t val)
{
	BT_ASSERT_PRE_NON_NULL(integer_obj, "Value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(integer_obj, BT_VALUE_TYPE_INTEGER);
	BT_ASSERT_PRE_VALUE_HOT(integer_obj, "Value object");
	BT_VALUE_TO_INTEGER(integer_obj)->value = val;
	BT_LOGV("Set integer value's raw value: value-addr=%p, value=%" PRId64,
		integer_obj, val);
}

double bt_value_real_get(const struct bt_value *real_obj)
{
	BT_ASSERT_PRE_NON_NULL(real_obj, "Value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(real_obj, BT_VALUE_TYPE_REAL);
	return BT_VALUE_TO_REAL(real_obj)->value;
}

void bt_private_value_real_set(struct bt_private_value *real_obj, double val)
{
	BT_ASSERT_PRE_NON_NULL(real_obj, "Value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(real_obj, BT_VALUE_TYPE_REAL);
	BT_ASSERT_PRE_VALUE_HOT(real_obj, "Value object");
	BT_VALUE_TO_REAL(real_obj)->value = val;
	BT_LOGV("Set real number value's raw value: value-addr=%p, value=%f",
		real_obj, val);
}

const char *bt_value_string_get(const struct bt_value *string_obj)
{
	BT_ASSERT_PRE_NON_NULL(string_obj, "Value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(string_obj, BT_VALUE_TYPE_STRING);
	return BT_VALUE_TO_STRING(string_obj)->gstr->str;
}

enum bt_value_status bt_private_value_string_set(
		struct bt_private_value *string_obj, const char *val)
{
	BT_ASSERT_PRE_NON_NULL(string_obj, "Value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(string_obj, BT_VALUE_TYPE_STRING);
	BT_ASSERT_PRE_VALUE_HOT(string_obj, "Value object");
	g_string_assign(BT_VALUE_TO_STRING(string_obj)->gstr, val);
	BT_LOGV("Set string value's raw value: value-addr=%p, raw-value-addr=%p",
		string_obj, val);
	return BT_VALUE_STATUS_OK;
}

uint64_t bt_value_array_get_size(const struct bt_value *array_obj)
{
	BT_ASSERT_PRE_NON_NULL(array_obj, "Value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(array_obj, BT_VALUE_TYPE_ARRAY);
	return (uint64_t) BT_VALUE_TO_ARRAY(array_obj)->garray->len;
}

struct bt_value *bt_value_array_borrow_element_by_index(
		const struct bt_value *array_obj,
		uint64_t index)
{
	struct bt_value_array *typed_array_obj =
		BT_VALUE_TO_ARRAY(array_obj);

	BT_ASSERT_PRE_NON_NULL(array_obj, "Value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(array_obj, BT_VALUE_TYPE_ARRAY);
	BT_ASSERT_PRE_VALUE_INDEX_IN_BOUNDS(index,
		typed_array_obj->garray->len);
	return g_ptr_array_index(typed_array_obj->garray, index);
}

struct bt_private_value *bt_private_value_array_borrow_element_by_index(
		const struct bt_private_value *array_obj,
		uint64_t index)
{
	return (void *) bt_value_array_borrow_element_by_index(
		(void *) array_obj, index);
}

enum bt_value_status bt_private_value_array_append_element(
		struct bt_private_value *array_obj,
		struct bt_value *element_obj)
{
	struct bt_value_array *typed_array_obj =
		BT_VALUE_TO_ARRAY(array_obj);

	BT_ASSERT_PRE_NON_NULL(array_obj, "Array value object");
	BT_ASSERT_PRE_NON_NULL(element_obj, "Element value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(array_obj, BT_VALUE_TYPE_ARRAY);
	BT_ASSERT_PRE_VALUE_HOT(array_obj, "Array value object");
	g_ptr_array_add(typed_array_obj->garray, element_obj);
	bt_object_get_ref(element_obj);
	BT_LOGV("Appended element to array value: array-value-addr=%p, "
		"element-value-addr=%p, new-size=%u",
		array_obj, element_obj, typed_array_obj->garray->len);
	return BT_VALUE_STATUS_OK;
}

enum bt_value_status bt_private_value_array_append_bool_element(
		struct bt_private_value *array_obj, bt_bool val)
{
	enum bt_value_status ret;
	struct bt_private_value *bool_obj = NULL;

	bool_obj = bt_private_value_bool_create_init(val);
	ret = bt_private_value_array_append_element(array_obj,
		(void *) bool_obj);
	bt_object_put_ref(bool_obj);
	return ret;
}

enum bt_value_status bt_private_value_array_append_integer_element(
		struct bt_private_value *array_obj, int64_t val)
{
	enum bt_value_status ret;
	struct bt_private_value *integer_obj = NULL;

	integer_obj = bt_private_value_integer_create_init(val);
	ret = bt_private_value_array_append_element(array_obj,
		(void *) integer_obj);
	bt_object_put_ref(integer_obj);
	return ret;
}

enum bt_value_status bt_private_value_array_append_real_element(
		struct bt_private_value *array_obj, double val)
{
	enum bt_value_status ret;
	struct bt_private_value *real_obj = NULL;

	real_obj = bt_private_value_real_create_init(val);
	ret = bt_private_value_array_append_element(array_obj,
		(void *) real_obj);
	bt_object_put_ref(real_obj);
	return ret;
}

enum bt_value_status bt_private_value_array_append_string_element(
		struct bt_private_value *array_obj, const char *val)
{
	enum bt_value_status ret;
	struct bt_private_value *string_obj = NULL;

	string_obj = bt_private_value_string_create_init(val);
	ret = bt_private_value_array_append_element(array_obj,
		(void *) string_obj);
	bt_object_put_ref(string_obj);
	return ret;
}

enum bt_value_status bt_private_value_array_append_empty_array_element(
		struct bt_private_value *array_obj)
{
	enum bt_value_status ret;
	struct bt_private_value *empty_array_obj = NULL;

	empty_array_obj = bt_private_value_array_create();
	ret = bt_private_value_array_append_element(array_obj,
		(void *) empty_array_obj);
	bt_object_put_ref(empty_array_obj);
	return ret;
}

enum bt_value_status bt_private_value_array_append_empty_map_element(
		struct bt_private_value *array_obj)
{
	enum bt_value_status ret;
	struct bt_private_value *map_obj = NULL;

	map_obj = bt_private_value_map_create();
	ret = bt_private_value_array_append_element(array_obj,
		(void *) map_obj);
	bt_object_put_ref(map_obj);
	return ret;
}

enum bt_value_status bt_private_value_array_set_element_by_index(
		struct bt_private_value *array_obj, uint64_t index,
		struct bt_value *element_obj)
{
	struct bt_value_array *typed_array_obj =
		BT_VALUE_TO_ARRAY(array_obj);

	BT_ASSERT_PRE_NON_NULL(array_obj, "Array value object");
	BT_ASSERT_PRE_NON_NULL(element_obj, "Element value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(array_obj, BT_VALUE_TYPE_ARRAY);
	BT_ASSERT_PRE_VALUE_HOT(array_obj, "Array value object");
	BT_ASSERT_PRE_VALUE_INDEX_IN_BOUNDS(index,
		typed_array_obj->garray->len);
	bt_object_put_ref(g_ptr_array_index(typed_array_obj->garray, index));
	g_ptr_array_index(typed_array_obj->garray, index) = element_obj;
	bt_object_get_ref(element_obj);
	BT_LOGV("Set array value's element: array-value-addr=%p, "
		"index=%" PRIu64 ", element-value-addr=%p",
		array_obj, index, element_obj);
	return BT_VALUE_STATUS_OK;
}

uint64_t bt_value_map_get_size(const struct bt_value *map_obj)
{
	BT_ASSERT_PRE_NON_NULL(map_obj, "Value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(map_obj, BT_VALUE_TYPE_MAP);
	return (uint64_t) g_hash_table_size(BT_VALUE_TO_MAP(map_obj)->ght);
}

struct bt_value *bt_value_map_borrow_entry_value(const struct bt_value *map_obj,
		const char *key)
{
	BT_ASSERT_PRE_NON_NULL(map_obj, "Value object");
	BT_ASSERT_PRE_NON_NULL(key, "Key");
	BT_ASSERT_PRE_VALUE_IS_TYPE(map_obj, BT_VALUE_TYPE_MAP);
	return g_hash_table_lookup(BT_VALUE_TO_MAP(map_obj)->ght,
		GUINT_TO_POINTER(g_quark_from_string(key)));
}

struct bt_private_value *bt_private_value_map_borrow_entry_value(
		const struct bt_private_value *map_obj, const char *key)
{
	return (void *) bt_value_map_borrow_entry_value((void *) map_obj, key);
}

bt_bool bt_value_map_has_entry(const struct bt_value *map_obj, const char *key)
{
	BT_ASSERT_PRE_NON_NULL(map_obj, "Value object");
	BT_ASSERT_PRE_NON_NULL(key, "Key");
	BT_ASSERT_PRE_VALUE_IS_TYPE(map_obj, BT_VALUE_TYPE_MAP);
	return bt_g_hash_table_contains(BT_VALUE_TO_MAP(map_obj)->ght,
		GUINT_TO_POINTER(g_quark_from_string(key)));
}

enum bt_value_status bt_private_value_map_insert_entry(
		struct bt_private_value *map_obj,
		const char *key, struct bt_value *element_obj)
{
	BT_ASSERT_PRE_NON_NULL(map_obj, "Map value object");
	BT_ASSERT_PRE_NON_NULL(key, "Key");
	BT_ASSERT_PRE_NON_NULL(element_obj, "Element value object");
	BT_ASSERT_PRE_VALUE_IS_TYPE(map_obj, BT_VALUE_TYPE_MAP);
	BT_ASSERT_PRE_VALUE_HOT(map_obj, "Map value object");
	g_hash_table_insert(BT_VALUE_TO_MAP(map_obj)->ght,
		GUINT_TO_POINTER(g_quark_from_string(key)), element_obj);
	bt_object_get_ref(element_obj);
	BT_LOGV("Inserted value into map value: map-value-addr=%p, "
		"key=\"%s\", element-value-addr=%p",
		map_obj, key, element_obj);
	return BT_VALUE_STATUS_OK;
}

enum bt_value_status bt_private_value_map_insert_bool_entry(
		struct bt_private_value *map_obj, const char *key, bt_bool val)
{
	enum bt_value_status ret;
	struct bt_private_value *bool_obj = NULL;

	bool_obj = bt_private_value_bool_create_init(val);
	ret = bt_private_value_map_insert_entry(map_obj, key,
		(void *) bool_obj);
	bt_object_put_ref(bool_obj);
	return ret;
}

enum bt_value_status bt_private_value_map_insert_integer_entry(
		struct bt_private_value *map_obj, const char *key, int64_t val)
{
	enum bt_value_status ret;
	struct bt_private_value *integer_obj = NULL;

	integer_obj = bt_private_value_integer_create_init(val);
	ret = bt_private_value_map_insert_entry(map_obj, key,
		(void *) integer_obj);
	bt_object_put_ref(integer_obj);
	return ret;
}

enum bt_value_status bt_private_value_map_insert_real_entry(
		struct bt_private_value *map_obj, const char *key, double val)
{
	enum bt_value_status ret;
	struct bt_private_value *real_obj = NULL;

	real_obj = bt_private_value_real_create_init(val);
	ret = bt_private_value_map_insert_entry(map_obj, key,
		(void *) real_obj);
	bt_object_put_ref(real_obj);
	return ret;
}

enum bt_value_status bt_private_value_map_insert_string_entry(
		struct bt_private_value *map_obj, const char *key,
		const char *val)
{
	enum bt_value_status ret;
	struct bt_private_value *string_obj = NULL;

	string_obj = bt_private_value_string_create_init(val);
	ret = bt_private_value_map_insert_entry(map_obj, key,
		(void *) string_obj);
	bt_object_put_ref(string_obj);
	return ret;
}

enum bt_value_status bt_private_value_map_insert_empty_array_entry(
		struct bt_private_value *map_obj, const char *key)
{
	enum bt_value_status ret;
	struct bt_private_value *array_obj = NULL;

	array_obj = bt_private_value_array_create();
	ret = bt_private_value_map_insert_entry(map_obj, key,
		(void *) array_obj);
	bt_object_put_ref(array_obj);
	return ret;
}

enum bt_value_status bt_private_value_map_insert_empty_map_entry(
		struct bt_private_value *map_obj, const char *key)
{
	enum bt_value_status ret;
	struct bt_private_value *empty_map_obj = NULL;

	empty_map_obj = bt_private_value_map_create();
	ret = bt_private_value_map_insert_entry(map_obj, key,
		(void *) empty_map_obj);
	bt_object_put_ref(empty_map_obj);
	return ret;
}

enum bt_value_status bt_value_map_foreach_entry(const struct bt_value *map_obj,
		bt_value_map_foreach_entry_cb cb, void *data)
{
	enum bt_value_status ret = BT_VALUE_STATUS_OK;
	gpointer key, element_obj;
	GHashTableIter iter;
	struct bt_value_map *typed_map_obj = BT_VALUE_TO_MAP(map_obj);

	BT_ASSERT_PRE_NON_NULL(map_obj, "Value object");
	BT_ASSERT_PRE_NON_NULL(cb, "Callback");
	BT_ASSERT_PRE_VALUE_IS_TYPE(map_obj, BT_VALUE_TYPE_MAP);
	g_hash_table_iter_init(&iter, typed_map_obj->ght);

	while (g_hash_table_iter_next(&iter, &key, &element_obj)) {
		const char *key_str = g_quark_to_string(GPOINTER_TO_UINT(key));

		if (!cb(key_str, element_obj, data)) {
			BT_LOGV("User canceled the loop: key=\"%s\", "
				"value-addr=%p, data=%p",
				key_str, element_obj, data);
			ret = BT_VALUE_STATUS_CANCELED;
			break;
		}
	}

	return ret;
}

enum bt_value_status bt_private_value_map_foreach_entry(
		const struct bt_private_value *map_obj,
		bt_private_value_map_foreach_entry_cb cb, void *data)
{
	return bt_value_map_foreach_entry((void *) map_obj,
		(bt_value_map_foreach_entry_cb) cb, data);
}

struct extend_map_element_data {
	struct bt_private_value *extended_obj;
	enum bt_value_status status;
};

static
bt_bool extend_map_element(const char *key,
		struct bt_value *extension_obj_elem, void *data)
{
	bt_bool ret = BT_TRUE;
	struct extend_map_element_data *extend_data = data;
	struct bt_private_value *extension_obj_elem_copy = NULL;

	/* Copy object which is to replace the current one */
	extend_data->status = bt_value_copy(&extension_obj_elem_copy,
		extension_obj_elem);
	if (extend_data->status) {
		BT_LOGE("Cannot copy map element: addr=%p",
			extension_obj_elem);
		goto error;
	}

	BT_ASSERT(extension_obj_elem_copy);

	/* Replace in extended object */
	extend_data->status = bt_private_value_map_insert_entry(
		extend_data->extended_obj, key,
		(void *) extension_obj_elem_copy);
	if (extend_data->status) {
		BT_LOGE("Cannot replace value in extended value: key=\"%s\", "
			"extended-value-addr=%p, element-value-addr=%p",
			key, extend_data->extended_obj,
			extension_obj_elem_copy);
		goto error;
	}

	goto end;

error:
	BT_ASSERT(extend_data->status != BT_VALUE_STATUS_OK);
	ret = BT_FALSE;

end:
	BT_OBJECT_PUT_REF_AND_RESET(extension_obj_elem_copy);
	return ret;
}

enum bt_value_status bt_value_map_extend(
		struct bt_private_value **extended_map_obj,
		struct bt_value *base_map_obj,
		struct bt_value *extension_obj)
{
	struct extend_map_element_data extend_data = {
		.extended_obj = NULL,
		.status = BT_VALUE_STATUS_OK,
	};

	BT_ASSERT_PRE_NON_NULL(base_map_obj, "Base value object");
	BT_ASSERT_PRE_NON_NULL(extension_obj, "Extension value object");
	BT_ASSERT_PRE_NON_NULL(extended_map_obj,
		"Extended value object (output)");
	BT_ASSERT_PRE_VALUE_IS_TYPE(base_map_obj, BT_VALUE_TYPE_MAP);
	BT_ASSERT_PRE_VALUE_IS_TYPE(extension_obj, BT_VALUE_TYPE_MAP);
	BT_LOGD("Extending map value: base-value-addr=%p, extension-value-addr=%p",
		base_map_obj, extension_obj);
	*extended_map_obj = NULL;

	/* Create copy of base map object to start with */
	extend_data.status = bt_value_copy(extended_map_obj, base_map_obj);
	if (extend_data.status) {
		BT_LOGE("Cannot copy base value: base-value-addr=%p",
			base_map_obj);
		goto error;
	}

	BT_ASSERT(extended_map_obj);

	/*
	 * For each key in the extension map object, replace this key
	 * in the copied map object.
	 */
	extend_data.extended_obj = *extended_map_obj;

	if (bt_value_map_foreach_entry(extension_obj, extend_map_element,
			&extend_data)) {
		BT_LOGE("Cannot iterate on the extension object's elements: "
			"extension-value-addr=%p", extension_obj);
		goto error;
	}

	if (extend_data.status) {
		BT_LOGE("Failed to successfully iterate on the extension object's elements: "
			"extension-value-addr=%p", extension_obj);
		goto error;
	}

	BT_LOGD("Extended map value: extended-value-addr=%p",
		*extended_map_obj);
	goto end;

error:
	BT_OBJECT_PUT_REF_AND_RESET(*extended_map_obj);
	*extended_map_obj = NULL;

end:
	return extend_data.status;
}

enum bt_value_status bt_value_copy(struct bt_private_value **copy_obj,
		const struct bt_value *object)
{
	enum bt_value_status status = BT_VALUE_STATUS_OK;

	BT_ASSERT_PRE_NON_NULL(object, "Value object");
	BT_ASSERT_PRE_NON_NULL(copy_obj, "Value object copy (output)");
	BT_LOGD("Copying value object: addr=%p", object);
	*copy_obj = copy_funcs[object->type](object);
	if (*copy_obj) {
		BT_LOGD("Copied value object: copy-value-addr=%p",
			copy_obj);
	} else {
		status = BT_VALUE_STATUS_NOMEM;
		*copy_obj = NULL;
		BT_LOGE_STR("Failed to copy value object.");
	}

	return status;
}

bt_bool bt_value_compare(const struct bt_value *object_a,
	const struct bt_value *object_b)
{
	bt_bool ret = BT_FALSE;

	BT_ASSERT_PRE_NON_NULL(object_a, "Value object A");
	BT_ASSERT_PRE_NON_NULL(object_b, "Value object B");

	if (object_a->type != object_b->type) {
		BT_LOGV("Values are different: type mismatch: "
			"value-a-addr=%p, value-b-addr=%p, "
			"value-a-type=%s, value-b-type=%s",
			object_a, object_b,
			bt_common_value_type_string(object_a->type),
			bt_common_value_type_string(object_b->type));
		goto end;
	}

	ret = compare_funcs[object_a->type](object_a, object_b);

end:
	return ret;
}

struct bt_value *bt_value_borrow_from_private(
		struct bt_private_value *priv_value)
{
	return (void *) priv_value;
}