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object.c
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object.c
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/*
* QEMU Object Model
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <[email protected]>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qom/object.h"
#include "qom/object_interfaces.h"
#include "qemu/cutils.h"
#include "qapi/visitor.h"
#include "qapi-visit.h"
#include "qapi/string-input-visitor.h"
#include "qapi/string-output-visitor.h"
#include "qapi/qmp/qerror.h"
#include "trace.h"
/* TODO: replace QObject with a simpler visitor to avoid a dependency
* of the QOM core on QObject? */
#include "qom/qom-qobject.h"
#include "qapi/qmp/qobject.h"
#include "qapi/qmp/qbool.h"
#include "qapi/qmp/qint.h"
#include "qapi/qmp/qstring.h"
#define MAX_INTERFACES 32
typedef struct InterfaceImpl InterfaceImpl;
typedef struct TypeImpl TypeImpl;
struct InterfaceImpl
{
const char *typename;
};
struct TypeImpl
{
const char *name;
size_t class_size;
size_t instance_size;
void (*class_init)(ObjectClass *klass, void *data);
void (*class_base_init)(ObjectClass *klass, void *data);
void (*class_finalize)(ObjectClass *klass, void *data);
void *class_data;
void (*instance_init)(Object *obj);
void (*instance_post_init)(Object *obj);
void (*instance_finalize)(Object *obj);
bool abstract;
const char *parent;
TypeImpl *parent_type;
ObjectClass *class;
int num_interfaces;
InterfaceImpl interfaces[MAX_INTERFACES];
};
static Type type_interface;
static GHashTable *type_table_get(void)
{
static GHashTable *type_table;
if (type_table == NULL) {
type_table = g_hash_table_new(g_str_hash, g_str_equal);
}
return type_table;
}
static bool enumerating_types;
static void type_table_add(TypeImpl *ti)
{
assert(!enumerating_types);
g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
}
static TypeImpl *type_table_lookup(const char *name)
{
return g_hash_table_lookup(type_table_get(), name);
}
static TypeImpl *type_new(const TypeInfo *info)
{
TypeImpl *ti = g_malloc0(sizeof(*ti));
int i;
g_assert(info->name != NULL);
if (type_table_lookup(info->name) != NULL) {
fprintf(stderr, "Registering `%s' which already exists\n", info->name);
abort();
}
ti->name = g_strdup(info->name);
ti->parent = g_strdup(info->parent);
ti->class_size = info->class_size;
ti->instance_size = info->instance_size;
ti->class_init = info->class_init;
ti->class_base_init = info->class_base_init;
ti->class_finalize = info->class_finalize;
ti->class_data = info->class_data;
ti->instance_init = info->instance_init;
ti->instance_post_init = info->instance_post_init;
ti->instance_finalize = info->instance_finalize;
ti->abstract = info->abstract;
for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
}
ti->num_interfaces = i;
return ti;
}
static TypeImpl *type_register_internal(const TypeInfo *info)
{
TypeImpl *ti;
ti = type_new(info);
type_table_add(ti);
return ti;
}
TypeImpl *type_register(const TypeInfo *info)
{
assert(info->parent);
return type_register_internal(info);
}
TypeImpl *type_register_static(const TypeInfo *info)
{
return type_register(info);
}
static TypeImpl *type_get_by_name(const char *name)
{
if (name == NULL) {
return NULL;
}
return type_table_lookup(name);
}
static TypeImpl *type_get_parent(TypeImpl *type)
{
if (!type->parent_type && type->parent) {
type->parent_type = type_get_by_name(type->parent);
g_assert(type->parent_type != NULL);
}
return type->parent_type;
}
static bool type_has_parent(TypeImpl *type)
{
return (type->parent != NULL);
}
static size_t type_class_get_size(TypeImpl *ti)
{
if (ti->class_size) {
return ti->class_size;
}
if (type_has_parent(ti)) {
return type_class_get_size(type_get_parent(ti));
}
return sizeof(ObjectClass);
}
static size_t type_object_get_size(TypeImpl *ti)
{
if (ti->instance_size) {
return ti->instance_size;
}
if (type_has_parent(ti)) {
return type_object_get_size(type_get_parent(ti));
}
return 0;
}
size_t object_type_get_instance_size(const char *typename)
{
TypeImpl *type = type_get_by_name(typename);
g_assert(type != NULL);
return type_object_get_size(type);
}
static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
{
assert(target_type);
/* Check if target_type is a direct ancestor of type */
while (type) {
if (type == target_type) {
return true;
}
type = type_get_parent(type);
}
return false;
}
static void type_initialize(TypeImpl *ti);
static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
TypeImpl *parent_type)
{
InterfaceClass *new_iface;
TypeInfo info = { };
TypeImpl *iface_impl;
info.parent = parent_type->name;
info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
info.abstract = true;
iface_impl = type_new(&info);
iface_impl->parent_type = parent_type;
type_initialize(iface_impl);
g_free((char *)info.name);
new_iface = (InterfaceClass *)iface_impl->class;
new_iface->concrete_class = ti->class;
new_iface->interface_type = interface_type;
ti->class->interfaces = g_slist_append(ti->class->interfaces,
iface_impl->class);
}
static void object_property_free(gpointer data)
{
ObjectProperty *prop = data;
g_free(prop->name);
g_free(prop->type);
g_free(prop->description);
g_free(prop);
}
static void type_initialize(TypeImpl *ti)
{
TypeImpl *parent;
if (ti->class) {
return;
}
ti->class_size = type_class_get_size(ti);
ti->instance_size = type_object_get_size(ti);
/* Any type with zero instance_size is implicitly abstract.
* This means interface types are all abstract.
*/
if (ti->instance_size == 0) {
ti->abstract = true;
}
ti->class = g_malloc0(ti->class_size);
parent = type_get_parent(ti);
if (parent) {
type_initialize(parent);
GSList *e;
int i;
g_assert_cmpint(parent->class_size, <=, ti->class_size);
memcpy(ti->class, parent->class, parent->class_size);
ti->class->interfaces = NULL;
ti->class->properties = g_hash_table_new_full(
g_str_hash, g_str_equal, g_free, object_property_free);
for (e = parent->class->interfaces; e; e = e->next) {
InterfaceClass *iface = e->data;
ObjectClass *klass = OBJECT_CLASS(iface);
type_initialize_interface(ti, iface->interface_type, klass->type);
}
for (i = 0; i < ti->num_interfaces; i++) {
TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
for (e = ti->class->interfaces; e; e = e->next) {
TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
if (type_is_ancestor(target_type, t)) {
break;
}
}
if (e) {
continue;
}
type_initialize_interface(ti, t, t);
}
} else {
ti->class->properties = g_hash_table_new_full(
g_str_hash, g_str_equal, g_free, object_property_free);
}
ti->class->type = ti;
while (parent) {
if (parent->class_base_init) {
parent->class_base_init(ti->class, ti->class_data);
}
parent = type_get_parent(parent);
}
if (ti->class_init) {
ti->class_init(ti->class, ti->class_data);
}
}
static void object_init_with_type(Object *obj, TypeImpl *ti)
{
if (type_has_parent(ti)) {
object_init_with_type(obj, type_get_parent(ti));
}
if (ti->instance_init) {
ti->instance_init(obj);
}
}
static void object_post_init_with_type(Object *obj, TypeImpl *ti)
{
if (ti->instance_post_init) {
ti->instance_post_init(obj);
}
if (type_has_parent(ti)) {
object_post_init_with_type(obj, type_get_parent(ti));
}
}
static void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
{
Object *obj = data;
g_assert(type != NULL);
type_initialize(type);
g_assert_cmpint(type->instance_size, >=, sizeof(Object));
g_assert(type->abstract == false);
g_assert_cmpint(size, >=, type->instance_size);
memset(obj, 0, type->instance_size);
obj->class = type->class;
object_ref(obj);
obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
NULL, object_property_free);
object_init_with_type(obj, type);
object_post_init_with_type(obj, type);
}
void object_initialize(void *data, size_t size, const char *typename)
{
TypeImpl *type = type_get_by_name(typename);
object_initialize_with_type(data, size, type);
}
static inline bool object_property_is_child(ObjectProperty *prop)
{
return strstart(prop->type, "child<", NULL);
}
static void object_property_del_all(Object *obj)
{
ObjectProperty *prop;
GHashTableIter iter;
gpointer key, value;
bool released;
do {
released = false;
g_hash_table_iter_init(&iter, obj->properties);
while (g_hash_table_iter_next(&iter, &key, &value)) {
prop = value;
if (prop->release) {
prop->release(obj, prop->name, prop->opaque);
prop->release = NULL;
released = true;
break;
}
g_hash_table_iter_remove(&iter);
}
} while (released);
g_hash_table_unref(obj->properties);
}
static void object_property_del_child(Object *obj, Object *child, Error **errp)
{
ObjectProperty *prop;
GHashTableIter iter;
gpointer key, value;
g_hash_table_iter_init(&iter, obj->properties);
while (g_hash_table_iter_next(&iter, &key, &value)) {
prop = value;
if (object_property_is_child(prop) && prop->opaque == child) {
if (prop->release) {
prop->release(obj, prop->name, prop->opaque);
prop->release = NULL;
}
break;
}
}
g_hash_table_iter_init(&iter, obj->properties);
while (g_hash_table_iter_next(&iter, &key, &value)) {
prop = value;
if (object_property_is_child(prop) && prop->opaque == child) {
g_hash_table_iter_remove(&iter);
break;
}
}
}
void object_unparent(Object *obj)
{
if (obj->parent) {
object_property_del_child(obj->parent, obj, NULL);
}
}
static void object_deinit(Object *obj, TypeImpl *type)
{
if (type->instance_finalize) {
type->instance_finalize(obj);
}
if (type_has_parent(type)) {
object_deinit(obj, type_get_parent(type));
}
}
static void object_finalize(void *data)
{
Object *obj = data;
TypeImpl *ti = obj->class->type;
object_property_del_all(obj);
object_deinit(obj, ti);
g_assert_cmpint(obj->ref, ==, 0);
if (obj->free) {
obj->free(obj);
}
}
static Object *object_new_with_type(Type type)
{
Object *obj;
g_assert(type != NULL);
type_initialize(type);
obj = g_malloc(type->instance_size);
object_initialize_with_type(obj, type->instance_size, type);
obj->free = g_free;
return obj;
}
Object *object_new(const char *typename)
{
TypeImpl *ti = type_get_by_name(typename);
return object_new_with_type(ti);
}
Object *object_new_with_props(const char *typename,
Object *parent,
const char *id,
Error **errp,
...)
{
va_list vargs;
Object *obj;
va_start(vargs, errp);
obj = object_new_with_propv(typename, parent, id, errp, vargs);
va_end(vargs);
return obj;
}
Object *object_new_with_propv(const char *typename,
Object *parent,
const char *id,
Error **errp,
va_list vargs)
{
Object *obj;
ObjectClass *klass;
Error *local_err = NULL;
klass = object_class_by_name(typename);
if (!klass) {
error_setg(errp, "invalid object type: %s", typename);
return NULL;
}
if (object_class_is_abstract(klass)) {
error_setg(errp, "object type '%s' is abstract", typename);
return NULL;
}
obj = object_new(typename);
if (object_set_propv(obj, &local_err, vargs) < 0) {
goto error;
}
object_property_add_child(parent, id, obj, &local_err);
if (local_err) {
goto error;
}
if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) {
user_creatable_complete(obj, &local_err);
if (local_err) {
object_unparent(obj);
goto error;
}
}
object_unref(OBJECT(obj));
return obj;
error:
error_propagate(errp, local_err);
object_unref(obj);
return NULL;
}
int object_set_props(Object *obj,
Error **errp,
...)
{
va_list vargs;
int ret;
va_start(vargs, errp);
ret = object_set_propv(obj, errp, vargs);
va_end(vargs);
return ret;
}
int object_set_propv(Object *obj,
Error **errp,
va_list vargs)
{
const char *propname;
Error *local_err = NULL;
propname = va_arg(vargs, char *);
while (propname != NULL) {
const char *value = va_arg(vargs, char *);
g_assert(value != NULL);
object_property_parse(obj, value, propname, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return -1;
}
propname = va_arg(vargs, char *);
}
return 0;
}
Object *object_dynamic_cast(Object *obj, const char *typename)
{
if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
return obj;
}
return NULL;
}
Object *object_dynamic_cast_assert(Object *obj, const char *typename,
const char *file, int line, const char *func)
{
trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
typename, file, line, func);
#ifdef CONFIG_QOM_CAST_DEBUG
int i;
Object *inst;
for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
goto out;
}
}
inst = object_dynamic_cast(obj, typename);
if (!inst && obj) {
fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
file, line, func, obj, typename);
abort();
}
assert(obj == inst);
if (obj && obj == inst) {
for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
atomic_set(&obj->class->object_cast_cache[i - 1],
atomic_read(&obj->class->object_cast_cache[i]));
}
atomic_set(&obj->class->object_cast_cache[i - 1], typename);
}
out:
#endif
return obj;
}
ObjectClass *object_class_dynamic_cast(ObjectClass *class,
const char *typename)
{
ObjectClass *ret = NULL;
TypeImpl *target_type;
TypeImpl *type;
if (!class) {
return NULL;
}
/* A simple fast path that can trigger a lot for leaf classes. */
type = class->type;
if (type->name == typename) {
return class;
}
target_type = type_get_by_name(typename);
if (!target_type) {
/* target class type unknown, so fail the cast */
return NULL;
}
if (type->class->interfaces &&
type_is_ancestor(target_type, type_interface)) {
int found = 0;
GSList *i;
for (i = class->interfaces; i; i = i->next) {
ObjectClass *target_class = i->data;
if (type_is_ancestor(target_class->type, target_type)) {
ret = target_class;
found++;
}
}
/* The match was ambiguous, don't allow a cast */
if (found > 1) {
ret = NULL;
}
} else if (type_is_ancestor(type, target_type)) {
ret = class;
}
return ret;
}
ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
const char *typename,
const char *file, int line,
const char *func)
{
ObjectClass *ret;
trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
typename, file, line, func);
#ifdef CONFIG_QOM_CAST_DEBUG
int i;
for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
if (atomic_read(&class->class_cast_cache[i]) == typename) {
ret = class;
goto out;
}
}
#else
if (!class || !class->interfaces) {
return class;
}
#endif
ret = object_class_dynamic_cast(class, typename);
if (!ret && class) {
fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
file, line, func, class, typename);
abort();
}
#ifdef CONFIG_QOM_CAST_DEBUG
if (class && ret == class) {
for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
atomic_set(&class->class_cast_cache[i - 1],
atomic_read(&class->class_cast_cache[i]));
}
atomic_set(&class->class_cast_cache[i - 1], typename);
}
out:
#endif
return ret;
}
const char *object_get_typename(Object *obj)
{
return obj->class->type->name;
}
ObjectClass *object_get_class(Object *obj)
{
return obj->class;
}
bool object_class_is_abstract(ObjectClass *klass)
{
return klass->type->abstract;
}
const char *object_class_get_name(ObjectClass *klass)
{
return klass->type->name;
}
ObjectClass *object_class_by_name(const char *typename)
{
TypeImpl *type = type_get_by_name(typename);
if (!type) {
return NULL;
}
type_initialize(type);
return type->class;
}
ObjectClass *object_class_get_parent(ObjectClass *class)
{
TypeImpl *type = type_get_parent(class->type);
if (!type) {
return NULL;
}
type_initialize(type);
return type->class;
}
typedef struct OCFData
{
void (*fn)(ObjectClass *klass, void *opaque);
const char *implements_type;
bool include_abstract;
void *opaque;
} OCFData;
static void object_class_foreach_tramp(gpointer key, gpointer value,
gpointer opaque)
{
OCFData *data = opaque;
TypeImpl *type = value;
ObjectClass *k;
type_initialize(type);
k = type->class;
if (!data->include_abstract && type->abstract) {
return;
}
if (data->implements_type &&
!object_class_dynamic_cast(k, data->implements_type)) {
return;
}
data->fn(k, data->opaque);
}
void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
const char *implements_type, bool include_abstract,
void *opaque)
{
OCFData data = { fn, implements_type, include_abstract, opaque };
enumerating_types = true;
g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
enumerating_types = false;
}
static int do_object_child_foreach(Object *obj,
int (*fn)(Object *child, void *opaque),
void *opaque, bool recurse)
{
GHashTableIter iter;
ObjectProperty *prop;
int ret = 0;
g_hash_table_iter_init(&iter, obj->properties);
while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
if (object_property_is_child(prop)) {
Object *child = prop->opaque;
ret = fn(child, opaque);
if (ret != 0) {
break;
}
if (recurse) {
do_object_child_foreach(child, fn, opaque, true);
}
}
}
return ret;
}
int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
void *opaque)
{
return do_object_child_foreach(obj, fn, opaque, false);
}
int object_child_foreach_recursive(Object *obj,
int (*fn)(Object *child, void *opaque),
void *opaque)
{
return do_object_child_foreach(obj, fn, opaque, true);
}
static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
{
GSList **list = opaque;
*list = g_slist_prepend(*list, klass);
}
GSList *object_class_get_list(const char *implements_type,
bool include_abstract)
{
GSList *list = NULL;
object_class_foreach(object_class_get_list_tramp,
implements_type, include_abstract, &list);
return list;
}
void object_ref(Object *obj)
{
if (!obj) {
return;
}
atomic_inc(&obj->ref);
}
void object_unref(Object *obj)
{
if (!obj) {
return;
}
g_assert_cmpint(obj->ref, >, 0);
/* parent always holds a reference to its children */
if (atomic_fetch_dec(&obj->ref) == 1) {
object_finalize(obj);
}
}
ObjectProperty *
object_property_add(Object *obj, const char *name, const char *type,
ObjectPropertyAccessor *get,
ObjectPropertyAccessor *set,
ObjectPropertyRelease *release,
void *opaque, Error **errp)
{
ObjectProperty *prop;
size_t name_len = strlen(name);
if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
int i;
ObjectProperty *ret;
char *name_no_array = g_strdup(name);
name_no_array[name_len - 3] = '\0';
for (i = 0; ; ++i) {
char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
ret = object_property_add(obj, full_name, type, get, set,
release, opaque, NULL);
g_free(full_name);
if (ret) {
break;
}
}
g_free(name_no_array);
return ret;
}
if (object_property_find(obj, name, NULL) != NULL) {
error_setg(errp, "attempt to add duplicate property '%s'"
" to object (type '%s')", name,
object_get_typename(obj));
return NULL;
}
prop = g_malloc0(sizeof(*prop));
prop->name = g_strdup(name);
prop->type = g_strdup(type);
prop->get = get;
prop->set = set;
prop->release = release;
prop->opaque = opaque;
g_hash_table_insert(obj->properties, prop->name, prop);
return prop;
}
ObjectProperty *
object_class_property_add(ObjectClass *klass,
const char *name,
const char *type,
ObjectPropertyAccessor *get,
ObjectPropertyAccessor *set,
ObjectPropertyRelease *release,
void *opaque,
Error **errp)
{
ObjectProperty *prop;
if (object_class_property_find(klass, name, NULL) != NULL) {
error_setg(errp, "attempt to add duplicate property '%s'"
" to object (type '%s')", name,
object_class_get_name(klass));
return NULL;
}
prop = g_malloc0(sizeof(*prop));
prop->name = g_strdup(name);
prop->type = g_strdup(type);
prop->get = get;
prop->set = set;
prop->release = release;
prop->opaque = opaque;
g_hash_table_insert(klass->properties, g_strdup(name), prop);
return prop;
}
ObjectProperty *object_property_find(Object *obj, const char *name,
Error **errp)
{
ObjectProperty *prop;
ObjectClass *klass = object_get_class(obj);
prop = object_class_property_find(klass, name, NULL);
if (prop) {
return prop;