[babeltrace.git] / src / lib / value.c

/*
 * SPDX-License-Identifier: MIT
 *
 * Copyright (c) 2015-2018 Philippe Proulx <pproulx@efficios.com>
 */

#define BT_LOG_TAG "LIB/VALUE"
#include "lib/logging.h"

#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <inttypes.h>
#include <babeltrace2/babeltrace.h>

#include "compat/compiler.h"
#include "common/common.h"
#include "compat/glib.h"
#include "lib/assert-pre.h"
#include "lib/assert-post.h"
#include "lib/value.h"
#include "common/assert.h"
#include "func-status.h"

#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_COND(_value, _type)                \
        (((struct bt_value *) (_value))->type == (_type))

#define _BT_ASSERT_PRE_VALUE_IS_TYPE_FMT                                \
        "Value has the wrong type ID: expected-type=%s, %![value-]+v"

#define BT_ASSERT_PRE_VALUE_IS_TYPE(_value, _type)                      \
        BT_ASSERT_PRE(                                                  \
                _BT_ASSERT_PRE_VALUE_IS_TYPE_COND((_value), (_type)),   \
                _BT_ASSERT_PRE_VALUE_IS_TYPE_FMT,                       \
                bt_common_value_type_string(_type), (_value))

#define BT_ASSERT_PRE_DEV_VALUE_IS_TYPE(_value, _type)                  \
        BT_ASSERT_PRE_DEV(                                              \
                _BT_ASSERT_PRE_VALUE_IS_TYPE_COND((_value), (_type)),   \
                _BT_ASSERT_PRE_VALUE_IS_TYPE_FMT,                       \
                bt_common_value_type_string(_type), (_value))

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

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 *const bt_value_null = &bt_value_null_instance;

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);
        BT_VALUE_TO_STRING(object)->gstr = NULL;
}

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);
        BT_VALUE_TO_ARRAY(object)->garray = NULL;
}

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);
        BT_VALUE_TO_MAP(object)->ght = NULL;
}

static
void (* const destroy_funcs[])(struct bt_value *) = {
        [BT_VALUE_TYPE_NULL] =                  NULL,
        [BT_VALUE_TYPE_BOOL] =                  NULL,
        [BT_VALUE_TYPE_UNSIGNED_INTEGER] =      NULL,
        [BT_VALUE_TYPE_SIGNED_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_value *bt_value_null_copy(const struct bt_value *null_obj)
{
        BT_ASSERT(null_obj == bt_value_null);

        bt_object_get_ref_no_null_check(bt_value_null);
        return (void *) bt_value_null;
}

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

static inline
struct bt_value *bt_value_integer_create_init(enum bt_value_type type,
                uint64_t uval);

static
struct bt_value *bt_value_integer_copy(
                const struct bt_value *integer_obj)
{
        return bt_value_integer_create_init(integer_obj->type,
                BT_VALUE_TO_INTEGER(integer_obj)->value.u);
}

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

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

static
struct bt_value *bt_value_array_copy(const struct bt_value *array_obj)
{
        int i;
        int ret;
        struct bt_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_value_array_create();
        if (!copy_obj) {
                BT_LIB_LOGE_APPEND_CAUSE("Cannot create empty array value.");
                goto end;
        }

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

                BT_LOGD("Copying array value's element: element-addr=%p, "
                        "index=%d", element_obj, i);
                ret = bt_value_copy(element_obj, &element_obj_copy);
                if (ret) {
                        BT_LIB_LOGE_APPEND_CAUSE(
                                "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_value_array_append_element(copy_obj,
                        (void *) element_obj_copy);
                BT_OBJECT_PUT_REF_AND_RESET(element_obj_copy);
                if (ret) {
                        BT_LIB_LOGE_APPEND_CAUSE(
                                "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_value *bt_value_map_copy(const struct bt_value *map_obj)
{
        int ret;
        GHashTableIter iter;
        gpointer key, element_obj;
        struct bt_value *copy_obj;
        struct bt_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_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, &element_obj_copy);
                if (ret) {
                        BT_LIB_LOGE_APPEND_CAUSE(
                                "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_value_map_insert_entry(copy_obj, key_str,
                        (void *) element_obj_copy);
                BT_OBJECT_PUT_REF_AND_RESET(element_obj_copy);
                if (ret) {
                        BT_LIB_LOGE_APPEND_CAUSE(
                                "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_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_UNSIGNED_INTEGER] =      bt_value_integer_copy,
        [BT_VALUE_TYPE_SIGNED_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_is_equal(const struct bt_value *object_a,
                const struct bt_value *object_b)
{
        /*
         * Always BT_TRUE since bt_value_is_equal() 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_is_equal(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_LOGT("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_is_equal(const struct bt_value *object_a,
                const struct bt_value *object_b)
{
        if (BT_VALUE_TO_INTEGER(object_a)->value.u !=
                        BT_VALUE_TO_INTEGER(object_b)->value.u) {
                if (object_a->type == BT_VALUE_TYPE_UNSIGNED_INTEGER) {
                        BT_LOGT("Unsigned integer value objects are different: "
                                "int-a-val=%" PRIu64 ", int-b-val=%" PRIu64,
                                BT_VALUE_TO_INTEGER(object_a)->value.u,
                                BT_VALUE_TO_INTEGER(object_b)->value.u);
                } else {
                        BT_LOGT("Signed integer value objects are different: "
                                "int-a-val=%" PRId64 ", int-b-val=%" PRId64,
                                BT_VALUE_TO_INTEGER(object_a)->value.i,
                                BT_VALUE_TO_INTEGER(object_b)->value.i);
                }

                return BT_FALSE;
        }

        return BT_TRUE;
}

static
bt_bool bt_value_real_is_equal(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_LOGT("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_is_equal(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_LOGT("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_is_equal(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_length(object_a) !=
                        bt_value_array_get_length(object_b)) {
                BT_LOGT("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_length(object_a),
                        bt_value_array_get_length(object_b));
                ret = BT_FALSE;
                goto end;
        }

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

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

                if (!bt_value_is_equal(element_obj_a, element_obj_b)) {
                        BT_LOGT("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_is_equal(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_LOGT("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)) {
                const 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_const(object_b,
                        key_str);

                if (!bt_value_is_equal(element_obj_a, element_obj_b)) {
                        BT_LOGT("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 is_equal_funcs[])(const struct bt_value *,
                const struct bt_value *) = {
        [BT_VALUE_TYPE_NULL] =                  bt_value_null_is_equal,
        [BT_VALUE_TYPE_BOOL] =                  bt_value_bool_is_equal,
        [BT_VALUE_TYPE_UNSIGNED_INTEGER] =      bt_value_integer_is_equal,
        [BT_VALUE_TYPE_SIGNED_INTEGER] =        bt_value_integer_is_equal,
        [BT_VALUE_TYPE_REAL] =                  bt_value_real_is_equal,
        [BT_VALUE_TYPE_STRING] =                bt_value_string_is_equal,
        [BT_VALUE_TYPE_ARRAY] =                 bt_value_array_is_equal,
        [BT_VALUE_TYPE_MAP] =                   bt_value_map_is_equal,
};

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_UNSIGNED_INTEGER] =      bt_value_generic_freeze,
        [BT_VALUE_TYPE_SIGNED_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
void _bt_value_freeze(const struct bt_value *c_object)
{
        const struct bt_value *object = (void *) c_object;

        BT_ASSERT(object);

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

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

end:
        return;
}

enum bt_value_type bt_value_get_type(const struct bt_value *object)
{
        BT_ASSERT_PRE_DEV_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_value *bt_value_bool_create_init(bt_bool val)
{
        struct bt_value_bool *bool_obj;

        BT_ASSERT_PRE_NO_ERROR();

        BT_LOGD("Creating boolean value object: val=%d", val);
        bool_obj = g_new0(struct bt_value_bool, 1);
        if (!bool_obj) {
                BT_LIB_LOGE_APPEND_CAUSE(
                        "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 *) bool_obj;
}

struct bt_value *bt_value_bool_create(void)
{
        BT_ASSERT_PRE_NO_ERROR();

        return bt_value_bool_create_init(BT_FALSE);
}

static inline
struct bt_value *bt_value_integer_create_init(enum bt_value_type type,
                uint64_t uval)
{
        struct bt_value_integer *integer_obj;

        BT_ASSERT(type == BT_VALUE_TYPE_UNSIGNED_INTEGER ||
                type == BT_VALUE_TYPE_SIGNED_INTEGER);

        if (type == BT_VALUE_TYPE_UNSIGNED_INTEGER) {
                BT_LOGD("Creating unsigned integer value object: val=%" PRIu64,
                        uval);
        } else {
                BT_LOGD("Creating signed integer value object: val=%" PRId64,
                        (int64_t) uval);
        }

        integer_obj = g_new0(struct bt_value_integer, 1);
        if (!integer_obj) {
                BT_LIB_LOGE_APPEND_CAUSE(
                        "Failed to allocate one integer value object.");
                goto end;
        }

        integer_obj->base = bt_value_create_base(type);
        integer_obj->value.u = uval;
        BT_LOGD("Created %ssigned integer value object: addr=%p",
                type == BT_VALUE_TYPE_UNSIGNED_INTEGER ? "un" : "",
                integer_obj);

end:
        return (void *) integer_obj;
}

struct bt_value *bt_value_integer_unsigned_create_init(uint64_t val)
{
        BT_ASSERT_PRE_NO_ERROR();

        return bt_value_integer_create_init(BT_VALUE_TYPE_UNSIGNED_INTEGER,
                val);
}

struct bt_value *bt_value_integer_unsigned_create(void)
{
        BT_ASSERT_PRE_NO_ERROR();

        return bt_value_integer_unsigned_create_init(0);
}

struct bt_value *bt_value_integer_signed_create_init(int64_t val)
{
        BT_ASSERT_PRE_NO_ERROR();

        return bt_value_integer_create_init(BT_VALUE_TYPE_SIGNED_INTEGER,
                (uint64_t) val);
}

struct bt_value *bt_value_integer_signed_create(void)
{
        BT_ASSERT_PRE_NO_ERROR();

        return bt_value_integer_signed_create_init(0);
}

struct bt_value *bt_value_real_create_init(double val)
{
        struct bt_value_real *real_obj;

        BT_ASSERT_PRE_NO_ERROR();

        BT_LOGD("Creating real number value object: val=%f", val);
        real_obj = g_new0(struct bt_value_real, 1);
        if (!real_obj) {
                BT_LIB_LOGE_APPEND_CAUSE(
                        "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 *) real_obj;
}

struct bt_value *bt_value_real_create(void)
{
        BT_ASSERT_PRE_NO_ERROR();

        return bt_value_real_create_init(0.);
}

struct bt_value *bt_value_string_create_init(const char *val)
{
        struct bt_value_string *string_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();
        BT_ASSERT_PRE_NON_NULL(val, "Value");

        BT_LOGD("Creating string value object: val-len=%zu", strlen(val));
        string_obj = g_new0(struct bt_value_string, 1);
        if (!string_obj) {
                BT_LIB_LOGE_APPEND_CAUSE(
                        "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_LIB_LOGE_APPEND_CAUSE(
                        "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 *) string_obj;
}

struct bt_value *bt_value_string_create(void)
{
        BT_ASSERT_PRE_NO_ERROR();

        return bt_value_string_create_init("");
}

struct bt_value *bt_value_array_create(void)
{
        struct bt_value_array *array_obj;

        BT_ASSERT_PRE_NO_ERROR();

        BT_LOGD_STR("Creating empty array value object.");
        array_obj = g_new0(struct bt_value_array, 1);
        if (!array_obj) {
                BT_LIB_LOGE_APPEND_CAUSE(
                        "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_LIB_LOGE_APPEND_CAUSE("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 *) array_obj;
}

struct bt_value *bt_value_map_create(void)
{
        struct bt_value_map *map_obj;

        BT_ASSERT_PRE_NO_ERROR();

        BT_LOGD_STR("Creating empty map value object.");
        map_obj = g_new0(struct bt_value_map, 1);
        if (!map_obj) {
                BT_LIB_LOGE_APPEND_CAUSE("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_LIB_LOGE_APPEND_CAUSE("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 *) map_obj;
}

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

void bt_value_bool_set(struct bt_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_DEV_VALUE_HOT(bool_obj, "Value object");
        BT_VALUE_TO_BOOL(bool_obj)->value = val;
        BT_LOGT("Set boolean value's raw value: value-addr=%p, value=%d",
                bool_obj, val);
}

uint64_t bt_value_integer_unsigned_get(const struct bt_value *integer_obj)
{
        BT_ASSERT_PRE_DEV_NON_NULL(integer_obj, "Value object");
        BT_ASSERT_PRE_DEV_VALUE_IS_TYPE(integer_obj,
                BT_VALUE_TYPE_UNSIGNED_INTEGER);
        return BT_VALUE_TO_INTEGER(integer_obj)->value.u;
}

int64_t bt_value_integer_signed_get(const struct bt_value *integer_obj)
{
        BT_ASSERT_PRE_DEV_NON_NULL(integer_obj, "Value object");
        BT_ASSERT_PRE_DEV_VALUE_IS_TYPE(integer_obj,
                BT_VALUE_TYPE_SIGNED_INTEGER);
        return BT_VALUE_TO_INTEGER(integer_obj)->value.i;
}

static inline
void bt_value_integer_set(struct bt_value *integer_obj,
                enum bt_value_type expected_type, uint64_t uval)
{
        BT_ASSERT_PRE_NON_NULL(integer_obj, "Value object");
        BT_ASSERT_PRE_VALUE_IS_TYPE(integer_obj, expected_type);
        BT_ASSERT_PRE_DEV_VALUE_HOT(integer_obj, "Value object");
        BT_VALUE_TO_INTEGER(integer_obj)->value.u = uval;
}

void bt_value_integer_unsigned_set(struct bt_value *integer_obj,
                uint64_t val)
{
        bt_value_integer_set(integer_obj, BT_VALUE_TYPE_UNSIGNED_INTEGER, val);
        BT_LOGT("Set unsigned integer value's raw value: "
                "value-addr=%p, value=%" PRIu64, integer_obj, val);
}

void bt_value_integer_signed_set(struct bt_value *integer_obj,
                int64_t val)
{
        bt_value_integer_set(integer_obj, BT_VALUE_TYPE_SIGNED_INTEGER,
                (uint64_t) val);
        BT_LOGT("Set signed 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_DEV_NON_NULL(real_obj, "Value object");
        BT_ASSERT_PRE_DEV_VALUE_IS_TYPE(real_obj, BT_VALUE_TYPE_REAL);
        return BT_VALUE_TO_REAL(real_obj)->value;
}

void bt_value_real_set(struct bt_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_DEV_VALUE_HOT(real_obj, "Value object");
        BT_VALUE_TO_REAL(real_obj)->value = val;
        BT_LOGT("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_DEV_NON_NULL(string_obj, "Value object");
        BT_ASSERT_PRE_DEV_VALUE_IS_TYPE(string_obj, BT_VALUE_TYPE_STRING);
        return BT_VALUE_TO_STRING(string_obj)->gstr->str;
}

enum bt_value_string_set_status bt_value_string_set(
                struct bt_value *string_obj, const char *val)
{
        BT_ASSERT_PRE_NO_ERROR();
        BT_ASSERT_PRE_NON_NULL(string_obj, "Value object");
        BT_ASSERT_PRE_VALUE_IS_TYPE(string_obj, BT_VALUE_TYPE_STRING);
        BT_ASSERT_PRE_DEV_VALUE_HOT(string_obj, "Value object");
        g_string_assign(BT_VALUE_TO_STRING(string_obj)->gstr, val);
        BT_LOGT("Set string value's raw value: value-addr=%p, raw-value-addr=%p",
                string_obj, val);
        return BT_FUNC_STATUS_OK;
}

uint64_t bt_value_array_get_length(const struct bt_value *array_obj)
{
        BT_ASSERT_PRE_DEV_NON_NULL(array_obj, "Value object");
        BT_ASSERT_PRE_DEV_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(
                struct bt_value *array_obj, uint64_t index)
{
        struct bt_value_array *typed_array_obj =
                BT_VALUE_TO_ARRAY(array_obj);

        BT_ASSERT_PRE_DEV_NON_NULL(array_obj, "Value object");
        BT_ASSERT_PRE_DEV_VALUE_IS_TYPE(array_obj, BT_VALUE_TYPE_ARRAY);
        BT_ASSERT_PRE_DEV_VALID_INDEX(index, typed_array_obj->garray->len);
        return g_ptr_array_index(typed_array_obj->garray, index);
}

const struct bt_value *bt_value_array_borrow_element_by_index_const(
                const struct bt_value *array_obj,
                uint64_t index)
{
        return bt_value_array_borrow_element_by_index(
                (void *) array_obj, index);
}

enum bt_value_array_append_element_status bt_value_array_append_element(
                struct bt_value *array_obj,
                struct bt_value *element_obj)
{
        struct bt_value_array *typed_array_obj =
                BT_VALUE_TO_ARRAY(array_obj);

        BT_ASSERT_PRE_NO_ERROR();
        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_DEV_VALUE_HOT(array_obj, "Array value object");
        g_ptr_array_add(typed_array_obj->garray, element_obj);
        bt_object_get_ref(element_obj);
        BT_LOGT("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_FUNC_STATUS_OK;
}

enum bt_value_array_append_element_status
bt_value_array_append_bool_element(struct bt_value *array_obj, bt_bool val)
{
        enum bt_value_array_append_element_status ret;
        struct bt_value *bool_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        bool_obj = bt_value_bool_create_init(val);
        ret = bt_value_array_append_element(array_obj,
                (void *) bool_obj);
        bt_object_put_ref(bool_obj);
        return ret;
}

enum bt_value_array_append_element_status
bt_value_array_append_unsigned_integer_element(struct bt_value *array_obj,
                uint64_t val)
{
        enum bt_value_array_append_element_status ret;
        struct bt_value *integer_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        integer_obj = bt_value_integer_unsigned_create_init(val);
        ret = bt_value_array_append_element(array_obj,
                (void *) integer_obj);
        bt_object_put_ref(integer_obj);
        return ret;
}

enum bt_value_array_append_element_status
bt_value_array_append_signed_integer_element(struct bt_value *array_obj,
                int64_t val)
{
        enum bt_value_array_append_element_status ret;
        struct bt_value *integer_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        integer_obj = bt_value_integer_signed_create_init(val);
        ret = bt_value_array_append_element(array_obj,
                (void *) integer_obj);
        bt_object_put_ref(integer_obj);
        return ret;
}

enum bt_value_array_append_element_status
bt_value_array_append_real_element(struct bt_value *array_obj, double val)
{
        enum bt_value_array_append_element_status ret;
        struct bt_value *real_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        real_obj = bt_value_real_create_init(val);
        ret = bt_value_array_append_element(array_obj,
                (void *) real_obj);
        bt_object_put_ref(real_obj);
        return ret;
}

enum bt_value_array_append_element_status
bt_value_array_append_string_element(struct bt_value *array_obj,
                const char *val)
{
        enum bt_value_array_append_element_status ret;
        struct bt_value *string_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        string_obj = bt_value_string_create_init(val);
        ret = bt_value_array_append_element(array_obj,
                (void *) string_obj);
        bt_object_put_ref(string_obj);
        return ret;
}

enum bt_value_array_append_element_status
bt_value_array_append_empty_array_element(struct bt_value *array_obj,
                struct bt_value **element_obj)
{
        enum bt_value_array_append_element_status ret;
        struct bt_value *empty_array_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        empty_array_obj = bt_value_array_create();
        ret = bt_value_array_append_element(array_obj,
                (void *) empty_array_obj);

        if (element_obj) {
                *element_obj = empty_array_obj;
        }

        bt_object_put_ref(empty_array_obj);
        return ret;
}

enum bt_value_array_append_element_status
bt_value_array_append_empty_map_element(struct bt_value *array_obj,
                struct bt_value **element_obj)
{
        enum bt_value_array_append_element_status ret;
        struct bt_value *map_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        map_obj = bt_value_map_create();
        ret = bt_value_array_append_element(array_obj,
                (void *) map_obj);

        if (element_obj) {
                *element_obj = map_obj;
        }

        bt_object_put_ref(map_obj);
        return ret;
}

enum bt_value_array_set_element_by_index_status
bt_value_array_set_element_by_index(struct bt_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_NO_ERROR();
        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_DEV_VALUE_HOT(array_obj, "Array value object");
        BT_ASSERT_PRE_VALID_INDEX(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_LOGT("Set array value's element: array-value-addr=%p, "
                "index=%" PRIu64 ", element-value-addr=%p",
                array_obj, index, element_obj);
        return BT_FUNC_STATUS_OK;
}

uint64_t bt_value_map_get_size(const struct bt_value *map_obj)
{
        BT_ASSERT_PRE_DEV_NON_NULL(map_obj, "Value object");
        BT_ASSERT_PRE_DEV_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(struct bt_value *map_obj,
                const char *key)
{
        BT_ASSERT_PRE_DEV_NON_NULL(map_obj, "Value object");
        BT_ASSERT_PRE_DEV_NON_NULL(key, "Key");
        BT_ASSERT_PRE_DEV_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)));
}

const struct bt_value *bt_value_map_borrow_entry_value_const(
                const struct bt_value *map_obj, const char *key)
{
        return 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_DEV_NON_NULL(map_obj, "Value object");
        BT_ASSERT_PRE_DEV_NON_NULL(key, "Key");
        BT_ASSERT_PRE_DEV_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_map_insert_entry_status bt_value_map_insert_entry(
                struct bt_value *map_obj, const char *key,
                struct bt_value *element_obj)
{
        BT_ASSERT_PRE_NO_ERROR();
        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_DEV_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_LOGT("Inserted value into map value: map-value-addr=%p, "
                "key=\"%s\", element-value-addr=%p",
                map_obj, key, element_obj);
        return BT_FUNC_STATUS_OK;
}

enum bt_value_map_insert_entry_status bt_value_map_insert_bool_entry(
                struct bt_value *map_obj, const char *key, bt_bool val)
{
        enum bt_value_map_insert_entry_status ret;
        struct bt_value *bool_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        bool_obj = bt_value_bool_create_init(val);
        ret = bt_value_map_insert_entry(map_obj, key,
                (void *) bool_obj);
        bt_object_put_ref(bool_obj);
        return ret;
}

enum bt_value_map_insert_entry_status
bt_value_map_insert_unsigned_integer_entry(struct bt_value *map_obj,
                const char *key, uint64_t val)
{
        enum bt_value_map_insert_entry_status ret;
        struct bt_value *integer_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        integer_obj = bt_value_integer_unsigned_create_init(val);
        ret = bt_value_map_insert_entry(map_obj, key,
                (void *) integer_obj);
        bt_object_put_ref(integer_obj);
        return ret;
}

enum bt_value_map_insert_entry_status
bt_value_map_insert_signed_integer_entry(struct bt_value *map_obj,
                const char *key, int64_t val)
{
        enum bt_value_map_insert_entry_status ret;
        struct bt_value *integer_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        integer_obj = bt_value_integer_signed_create_init(val);
        ret = bt_value_map_insert_entry(map_obj, key,
                (void *) integer_obj);
        bt_object_put_ref(integer_obj);
        return ret;
}

enum bt_value_map_insert_entry_status bt_value_map_insert_real_entry(
                struct bt_value *map_obj, const char *key, double val)
{
        enum bt_value_map_insert_entry_status ret;
        struct bt_value *real_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        real_obj = bt_value_real_create_init(val);
        ret = bt_value_map_insert_entry(map_obj, key,
                (void *) real_obj);
        bt_object_put_ref(real_obj);
        return ret;
}

enum bt_value_map_insert_entry_status bt_value_map_insert_string_entry(
                struct bt_value *map_obj, const char *key,
                const char *val)
{
        enum bt_value_map_insert_entry_status ret;
        struct bt_value *string_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        string_obj = bt_value_string_create_init(val);
        ret = bt_value_map_insert_entry(map_obj, key,
                (void *) string_obj);
        bt_object_put_ref(string_obj);
        return ret;
}

enum bt_value_map_insert_entry_status
bt_value_map_insert_empty_array_entry(
                struct bt_value *map_obj, const char *key,
                bt_value **entry_obj)
{
        enum bt_value_map_insert_entry_status ret;
        struct bt_value *array_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        array_obj = bt_value_array_create();
        ret = bt_value_map_insert_entry(map_obj, key,
                (void *) array_obj);

        if (entry_obj) {
                *entry_obj = array_obj;
        }

        bt_object_put_ref(array_obj);
        return ret;
}

enum bt_value_map_insert_entry_status
bt_value_map_insert_empty_map_entry(struct bt_value *map_obj, const char *key,
                bt_value **entry_obj)
{
        enum bt_value_map_insert_entry_status ret;
        struct bt_value *empty_map_obj = NULL;

        BT_ASSERT_PRE_NO_ERROR();

        empty_map_obj = bt_value_map_create();
        ret = bt_value_map_insert_entry(map_obj, key,
                (void *) empty_map_obj);

        if (entry_obj) {
                *entry_obj = empty_map_obj;
        }

        bt_object_put_ref(empty_map_obj);
        return ret;
}

enum bt_value_map_foreach_entry_status bt_value_map_foreach_entry(
                struct bt_value *map_obj, bt_value_map_foreach_entry_func func,
                void *data)
{
        int status = BT_FUNC_STATUS_OK;
        gpointer key, element_obj;
        GHashTableIter iter;
        struct bt_value_map *typed_map_obj = BT_VALUE_TO_MAP(map_obj);

        BT_ASSERT_PRE_NO_ERROR();

        BT_ASSERT_PRE_DEV_NON_NULL(map_obj, "Value object");
        BT_ASSERT_PRE_DEV_NON_NULL(func, "Callback");
        BT_ASSERT_PRE_DEV_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));

                status = func(key_str, element_obj, data);
                BT_ASSERT_POST_NO_ERROR_IF_NO_ERROR_STATUS(status);
                if (status != BT_FUNC_STATUS_OK) {
                        if (status < 0) {
                                BT_LIB_LOGE_APPEND_CAUSE(
                                        "User function failed while iterating "
                                        "map value entries: "
                                        "status=%s, key=\"%s\", "
                                        "value-addr=%p, data=%p",
                                        bt_common_func_status_string(status),
                                        key_str, element_obj, data);

                                if (status == BT_FUNC_STATUS_ERROR) {
                                        /*
                                         * User function error becomes a
                                         * user error from this
                                         * function's caller's
                                         * perspective.
                                         */
                                        status = BT_FUNC_STATUS_USER_ERROR;
                                }
                        } else {
                                BT_ASSERT(status == BT_FUNC_STATUS_INTERRUPTED);
                                BT_LOGT("User interrupted the loop: status=%s, "
                                        "key=\"%s\", value-addr=%p, data=%p",
                                        bt_common_func_status_string(status),
                                        key_str, element_obj, data);
                        }

                        break;
                }
        }

        return status;
}

enum bt_value_map_foreach_entry_const_status bt_value_map_foreach_entry_const(
                const struct bt_value *map_obj,
                bt_value_map_foreach_entry_const_func func, void *data)
{
        BT_ASSERT_PRE_NO_ERROR();

        return (int) bt_value_map_foreach_entry((void *) map_obj,
                (bt_value_map_foreach_entry_func) func, data);
}

struct extend_map_element_data {
        struct bt_value *base_obj;
};

static
bt_value_map_foreach_entry_const_func_status extend_map_element(
                const char *key, const struct bt_value *extension_obj_elem,
                void *data)
{
        int status;
        struct extend_map_element_data *extend_data = data;
        struct bt_value *extension_obj_elem_copy = NULL;

        /* Copy object which is to replace the current one */
        status = bt_value_copy(extension_obj_elem, &extension_obj_elem_copy);
        if (status) {
                BT_LIB_LOGE_APPEND_CAUSE("Cannot copy map element: %!+v",
                        extension_obj_elem);
                goto error;
        }

        BT_ASSERT(extension_obj_elem_copy);

        /* Replace in base map value. */
        status = bt_value_map_insert_entry(extend_data->base_obj, key,
                extension_obj_elem_copy);
        if (status) {
                BT_LIB_LOGE_APPEND_CAUSE(
                        "Cannot replace value in base map value: key=\"%s\", "
                        "%![base-map-value-]+v, %![element-value-]+v",
                        key, extend_data->base_obj, extension_obj_elem_copy);
                goto error;
        }

        goto end;

error:
        BT_ASSERT(status < 0);

end:
        BT_OBJECT_PUT_REF_AND_RESET(extension_obj_elem_copy);
        BT_ASSERT(status == BT_FUNC_STATUS_OK ||
                status == BT_FUNC_STATUS_MEMORY_ERROR);
        return status;
}

enum bt_value_map_extend_status bt_value_map_extend(
                struct bt_value *base_map_obj,
                const struct bt_value *extension_obj)
{
        int status = BT_FUNC_STATUS_OK;
        struct extend_map_element_data extend_data = {
                .base_obj = NULL,
        };

        BT_ASSERT_PRE_NO_ERROR();
        BT_ASSERT_PRE_NON_NULL(base_map_obj, "Base value object");
        BT_ASSERT_PRE_DEV_VALUE_HOT(base_map_obj, "Base value object");
        BT_ASSERT_PRE_NON_NULL(extension_obj, "Extension value object");
        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);

        /*
         * For each key in the extension map object, replace this key
         * in the base map object.
         */
        extend_data.base_obj = base_map_obj;
        status = bt_value_map_foreach_entry_const(extension_obj,
                extend_map_element, &extend_data);
        if (status != BT_FUNC_STATUS_OK) {
                BT_ASSERT(status == BT_FUNC_STATUS_MEMORY_ERROR);
                BT_LIB_LOGE_APPEND_CAUSE(
                        "Cannot iterate on the extension object's elements: "
                        "%![extension-value-]+v", extension_obj);
        }

        return status;
}

enum bt_value_copy_status bt_value_copy(const struct bt_value *object,
                struct bt_value **copy_obj)
{
        enum bt_value_copy_status status = BT_FUNC_STATUS_OK;

        BT_ASSERT_PRE_NO_ERROR();
        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_FUNC_STATUS_MEMORY_ERROR;
                *copy_obj = NULL;
                BT_LIB_LOGE_APPEND_CAUSE("Failed to copy value object.");
        }

        return status;
}

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

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

        if (object_a->type != object_b->type) {
                BT_LOGT("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 = is_equal_funcs[object_a->type](object_a, object_b);

end:
        return ret;
}

void bt_value_get_ref(const struct bt_value *value)
{
        bt_object_get_ref(value);
}

void bt_value_put_ref(const struct bt_value *value)
{
        bt_object_put_ref(value);
}