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qemu-irix/qom/object.c

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/*
* QEMU Object Model
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* 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 "qom/object.h"
#include "qemu-common.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;
}
static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
{
assert(target_type);
/* Check if typename 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 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);
ti->class = g_malloc0(ti->class_size);
parent = type_get_parent(ti);
if (parent) {
type_initialize(parent);
GSList *e;
int i;
g_assert(parent->class_size <= ti->class_size);
memcpy(ti->class, parent->class, parent->class_size);
ti->class->interfaces = NULL;
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);
}
}
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));
}
}
void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
{
Object *obj = data;
g_assert(type != NULL);
type_initialize(type);
g_assert(type->instance_size >= sizeof(Object));
g_assert(type->abstract == false);
g_assert(size >= type->instance_size);
memset(obj, 0, type->instance_size);
obj->class = type->class;
object_ref(obj);
QTAILQ_INIT(&obj->properties);
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 inline bool object_property_is_link(ObjectProperty *prop)
{
return strstart(prop->type, "link<", NULL);
}
static void object_property_del_all(Object *obj)
{
while (!QTAILQ_EMPTY(&obj->properties)) {
ObjectProperty *prop = QTAILQ_FIRST(&obj->properties);
QTAILQ_REMOVE(&obj->properties, prop, node);
if (prop->release) {
prop->release(obj, prop->name, prop->opaque);
}
g_free(prop->name);
g_free(prop->type);
g_free(prop);
}
}
static void object_property_del_child(Object *obj, Object *child, Error **errp)
{
ObjectProperty *prop;
QTAILQ_FOREACH(prop, &obj->properties, node) {
if (object_property_is_child(prop) && prop->opaque == child) {
object_property_del(obj, prop->name, errp);
break;
}
}
}
void object_unparent(Object *obj)
{
if (!obj->parent) {
return;
}
object_ref(obj);
if (obj->class->unparent) {
(obj->class->unparent)(obj);
}
if (obj->parent) {
object_property_del_child(obj->parent, obj, NULL);
}
object_unref(obj);
}
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_deinit(obj, ti);
object_property_del_all(obj);
g_assert(obj->ref == 0);
if (obj->free) {
obj->free(obj);
}
}
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_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 (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++) {
obj->class->object_cast_cache[i - 1] =
obj->class->object_cast_cache[i];
}
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 (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++) {
class->class_cast_cache[i - 1] = class->class_cast_cache[i];
}
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;
}
int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
void *opaque)
{
ObjectProperty *prop;
int ret = 0;
QTAILQ_FOREACH(prop, &obj->properties, node) {
if (object_property_is_child(prop)) {
ret = fn(prop->opaque, opaque);
if (ret != 0) {
break;
}
}
}
return ret;
}
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)
{
atomic_inc(&obj->ref);
}
void object_unref(Object *obj)
{
g_assert(obj->ref > 0);
/* parent always holds a reference to its children */
if (atomic_fetch_dec(&obj->ref) == 1) {
object_finalize(obj);
}
}
void object_property_add(Object *obj, const char *name, const char *type,
ObjectPropertyAccessor *get,
ObjectPropertyAccessor *set,
ObjectPropertyRelease *release,
void *opaque, Error **errp)
{
ObjectProperty *prop;
QTAILQ_FOREACH(prop, &obj->properties, node) {
if (strcmp(prop->name, name) == 0) {
error_setg(errp, "attempt to add duplicate property '%s'"
" to object (type '%s')", name,
object_get_typename(obj));
return;
}
}
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;
QTAILQ_INSERT_TAIL(&obj->properties, prop, node);
}
ObjectProperty *object_property_find(Object *obj, const char *name,
Error **errp)
{
ObjectProperty *prop;
QTAILQ_FOREACH(prop, &obj->properties, node) {
if (strcmp(prop->name, name) == 0) {
return prop;
}
}
error_setg(errp, "Property '.%s' not found", name);
return NULL;
}
void object_property_del(Object *obj, const char *name, Error **errp)
{
ObjectProperty *prop = object_property_find(obj, name, errp);
if (prop == NULL) {
return;
}
if (prop->release) {
prop->release(obj, name, prop->opaque);
}
QTAILQ_REMOVE(&obj->properties, prop, node);
g_free(prop->name);
g_free(prop->type);
g_free(prop);
}
void object_property_get(Object *obj, Visitor *v, const char *name,
Error **errp)
{
ObjectProperty *prop = object_property_find(obj, name, errp);
if (prop == NULL) {
return;
}
if (!prop->get) {
error_set(errp, QERR_PERMISSION_DENIED);
} else {
prop->get(obj, v, prop->opaque, name, errp);
}
}
void object_property_set(Object *obj, Visitor *v, const char *name,
Error **errp)
{
ObjectProperty *prop = object_property_find(obj, name, errp);
if (prop == NULL) {
return;
}
if (!prop->set) {
error_set(errp, QERR_PERMISSION_DENIED);
} else {
prop->set(obj, v, prop->opaque, name, errp);
}
}
void object_property_set_str(Object *obj, const char *value,
const char *name, Error **errp)
{
QString *qstr = qstring_from_str(value);
object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
QDECREF(qstr);
}
char *object_property_get_str(Object *obj, const char *name,
Error **errp)
{
QObject *ret = object_property_get_qobject(obj, name, errp);
QString *qstring;
char *retval;
if (!ret) {
return NULL;
}
qstring = qobject_to_qstring(ret);
if (!qstring) {
error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
retval = NULL;
} else {
retval = g_strdup(qstring_get_str(qstring));
}
QDECREF(qstring);
return retval;
}
void object_property_set_link(Object *obj, Object *value,
const char *name, Error **errp)
{
gchar *path = object_get_canonical_path(value);
object_property_set_str(obj, path, name, errp);
g_free(path);
}
Object *object_property_get_link(Object *obj, const char *name,
Error **errp)
{
char *str = object_property_get_str(obj, name, errp);
Object *target = NULL;
if (str && *str) {
target = object_resolve_path(str, NULL);
if (!target) {
error_set(errp, QERR_DEVICE_NOT_FOUND, str);
}
}
g_free(str);
return target;
}
void object_property_set_bool(Object *obj, bool value,
const char *name, Error **errp)
{
QBool *qbool = qbool_from_int(value);
object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
QDECREF(qbool);
}
bool object_property_get_bool(Object *obj, const char *name,
Error **errp)
{
QObject *ret = object_property_get_qobject(obj, name, errp);
QBool *qbool;
bool retval;
if (!ret) {
return false;
}
qbool = qobject_to_qbool(ret);
if (!qbool) {
error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
retval = false;
} else {
retval = qbool_get_int(qbool);
}
QDECREF(qbool);
return retval;
}
void object_property_set_int(Object *obj, int64_t value,
const char *name, Error **errp)
{
QInt *qint = qint_from_int(value);
object_property_set_qobject(obj, QOBJECT(qint), name, errp);
QDECREF(qint);
}
int64_t object_property_get_int(Object *obj, const char *name,
Error **errp)
{
QObject *ret = object_property_get_qobject(obj, name, errp);
QInt *qint;
int64_t retval;
if (!ret) {
return -1;
}
qint = qobject_to_qint(ret);
if (!qint) {
error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
retval = -1;
} else {
retval = qint_get_int(qint);
}
QDECREF(qint);
return retval;
}
int object_property_get_enum(Object *obj, const char *name,
const char *strings[], Error **errp)
{
StringOutputVisitor *sov;
StringInputVisitor *siv;
int ret;
sov = string_output_visitor_new(false);
object_property_get(obj, string_output_get_visitor(sov), name, errp);
siv = string_input_visitor_new(string_output_get_string(sov));
string_output_visitor_cleanup(sov);
visit_type_enum(string_input_get_visitor(siv),
&ret, strings, NULL, name, errp);
string_input_visitor_cleanup(siv);
return ret;
}
void object_property_get_uint16List(Object *obj, const char *name,
uint16List **list, Error **errp)
{
StringOutputVisitor *ov;
StringInputVisitor *iv;
ov = string_output_visitor_new(false);
object_property_get(obj, string_output_get_visitor(ov),
name, errp);
iv = string_input_visitor_new(string_output_get_string(ov));
visit_type_uint16List(string_input_get_visitor(iv),
list, NULL, errp);
string_output_visitor_cleanup(ov);
string_input_visitor_cleanup(iv);
}
void object_property_parse(Object *obj, const char *string,
const char *name, Error **errp)
{
StringInputVisitor *mi;
mi = string_input_visitor_new(string);
object_property_set(obj, string_input_get_visitor(mi), name, errp);
string_input_visitor_cleanup(mi);
}
char *object_property_print(Object *obj, const char *name, bool human,
Error **errp)
{
StringOutputVisitor *mo;
char *string;
mo = string_output_visitor_new(human);
object_property_get(obj, string_output_get_visitor(mo), name, errp);
string = string_output_get_string(mo);
string_output_visitor_cleanup(mo);
return string;
}
const char *object_property_get_type(Object *obj, const char *name, Error **errp)
{
ObjectProperty *prop = object_property_find(obj, name, errp);
if (prop == NULL) {
return NULL;
}
return prop->type;
}
Object *object_get_root(void)
{
static Object *root;
if (!root) {
root = object_new("container");
}
return root;
}
static void object_get_child_property(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
Object *child = opaque;
gchar *path;
path = object_get_canonical_path(child);
visit_type_str(v, &path, name, errp);
g_free(path);
}
static void object_finalize_child_property(Object *obj, const char *name,
void *opaque)
{
Object *child = opaque;
object_unref(child);
}
void object_property_add_child(Object *obj, const char *name,
Object *child, Error **errp)
{
Error *local_err = NULL;
gchar *type;
type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
object_property_add(obj, name, type, object_get_child_property, NULL,
object_finalize_child_property, child, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out;
}
object_ref(child);
g_assert(child->parent == NULL);
child->parent = obj;
out:
g_free(type);
}
void object_property_allow_set_link(Object *obj, const char *name,
Object *val, Error **errp)
{
/* Allow the link to be set, always */
}
typedef struct {
Object **child;
void (*check)(Object *, const char *, Object *, Error **);
ObjectPropertyLinkFlags flags;
} LinkProperty;
static void object_get_link_property(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
LinkProperty *lprop = opaque;
Object **child = lprop->child;
gchar *path;
if (*child) {
path = object_get_canonical_path(*child);
visit_type_str(v, &path, name, errp);
g_free(path);
} else {
path = (gchar *)"";
visit_type_str(v, &path, name, errp);
}
}
/*
* object_resolve_link:
*
* Lookup an object and ensure its type matches the link property type. This
* is similar to object_resolve_path() except type verification against the
* link property is performed.
*
* Returns: The matched object or NULL on path lookup failures.
*/
static Object *object_resolve_link(Object *obj, const char *name,
const char *path, Error **errp)
{
const char *type;
gchar *target_type;
bool ambiguous = false;
Object *target;
/* Go from link<FOO> to FOO. */
type = object_property_get_type(obj, name, NULL);
target_type = g_strndup(&type[5], strlen(type) - 6);
target = object_resolve_path_type(path, target_type, &ambiguous);
if (ambiguous) {
error_set(errp, ERROR_CLASS_GENERIC_ERROR,
"Path '%s' does not uniquely identify an object", path);
} else if (!target) {
target = object_resolve_path(path, &ambiguous);
if (target || ambiguous) {
error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
} else {
error_set(errp, QERR_DEVICE_NOT_FOUND, path);
}
target = NULL;
}
g_free(target_type);
return target;
}
static void object_set_link_property(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
Error *local_err = NULL;
LinkProperty *prop = opaque;
Object **child = prop->child;
Object *old_target = *child;
Object *new_target = NULL;
char *path = NULL;
visit_type_str(v, &path, name, &local_err);
if (!local_err && strcmp(path, "") != 0) {
new_target = object_resolve_link(obj, name, path, &local_err);
}
g_free(path);
if (local_err) {
error_propagate(errp, local_err);
return;
}
prop->check(obj, name, new_target, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (new_target) {
object_ref(new_target);
}
*child = new_target;
if (old_target != NULL) {
object_unref(old_target);
}
}
static void object_release_link_property(Object *obj, const char *name,
void *opaque)
{
LinkProperty *prop = opaque;
if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
object_unref(*prop->child);
}
g_free(prop);
}
void object_property_add_link(Object *obj, const char *name,
const char *type, Object **child,
void (*check)(Object *, const char *,
Object *, Error **),
ObjectPropertyLinkFlags flags,
Error **errp)
{
Error *local_err = NULL;
LinkProperty *prop = g_malloc(sizeof(*prop));
gchar *full_type;
prop->child = child;
prop->check = check;
prop->flags = flags;
full_type = g_strdup_printf("link<%s>", type);
object_property_add(obj, name, full_type,
object_get_link_property,
check ? object_set_link_property : NULL,
object_release_link_property,
prop,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
g_free(prop);
}
g_free(full_type);
}
gchar *object_get_canonical_path_component(Object *obj)
{
ObjectProperty *prop = NULL;
g_assert(obj);
g_assert(obj->parent != NULL);
QTAILQ_FOREACH(prop, &obj->parent->properties, node) {
if (!object_property_is_child(prop)) {
continue;
}
if (prop->opaque == obj) {
return g_strdup(prop->name);
}
}
/* obj had a parent but was not a child, should never happen */
g_assert_not_reached();
return NULL;
}
gchar *object_get_canonical_path(Object *obj)
{
Object *root = object_get_root();
char *newpath, *path = NULL;
while (obj != root) {
char *component = object_get_canonical_path_component(obj);
if (path) {
newpath = g_strdup_printf("%s/%s", component, path);
g_free(component);
g_free(path);
path = newpath;
} else {
path = component;
}
obj = obj->parent;
}
newpath = g_strdup_printf("/%s", path ? path : "");
g_free(path);
return newpath;
}
Object *object_resolve_path_component(Object *parent, const gchar *part)
{
ObjectProperty *prop = object_property_find(parent, part, NULL);
if (prop == NULL) {
return NULL;
}
if (object_property_is_link(prop)) {
LinkProperty *lprop = prop->opaque;
return *lprop->child;
} else if (object_property_is_child(prop)) {
return prop->opaque;
} else {
return NULL;
}
}
static Object *object_resolve_abs_path(Object *parent,
gchar **parts,
const char *typename,
int index)
{
Object *child;
if (parts[index] == NULL) {
return object_dynamic_cast(parent, typename);
}
if (strcmp(parts[index], "") == 0) {
return object_resolve_abs_path(parent, parts, typename, index + 1);
}
child = object_resolve_path_component(parent, parts[index]);
if (!child) {
return NULL;
}
return object_resolve_abs_path(child, parts, typename, index + 1);
}
static Object *object_resolve_partial_path(Object *parent,
gchar **parts,
const char *typename,
bool *ambiguous)
{
Object *obj;
ObjectProperty *prop;
obj = object_resolve_abs_path(parent, parts, typename, 0);
QTAILQ_FOREACH(prop, &parent->properties, node) {
Object *found;
if (!object_property_is_child(prop)) {
continue;
}
found = object_resolve_partial_path(prop->opaque, parts,
typename, ambiguous);
if (found) {
if (obj) {
if (ambiguous) {
*ambiguous = true;
}
return NULL;
}
obj = found;
}
if (ambiguous && *ambiguous) {
return NULL;
}
}
return obj;
}
Object *object_resolve_path_type(const char *path, const char *typename,
bool *ambiguous)
{
Object *obj;
gchar **parts;
parts = g_strsplit(path, "/", 0);
assert(parts);
if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
if (ambiguous) {
*ambiguous = false;
}
obj = object_resolve_partial_path(object_get_root(), parts,
typename, ambiguous);
} else {
obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
}
g_strfreev(parts);
return obj;
}
Object *object_resolve_path(const char *path, bool *ambiguous)
{
return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
}
typedef struct StringProperty
{
char *(*get)(Object *, Error **);
void (*set)(Object *, const char *, Error **);
} StringProperty;
static void property_get_str(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
StringProperty *prop = opaque;
char *value;
value = prop->get(obj, errp);
if (value) {
visit_type_str(v, &value, name, errp);
g_free(value);
}
}
static void property_set_str(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
StringProperty *prop = opaque;
char *value;
Error *local_err = NULL;
visit_type_str(v, &value, name, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
prop->set(obj, value, errp);
g_free(value);
}
static void property_release_str(Object *obj, const char *name,
void *opaque)
{
StringProperty *prop = opaque;
g_free(prop);
}
void object_property_add_str(Object *obj, const char *name,
char *(*get)(Object *, Error **),
void (*set)(Object *, const char *, Error **),
Error **errp)
{
Error *local_err = NULL;
StringProperty *prop = g_malloc0(sizeof(*prop));
prop->get = get;
prop->set = set;
object_property_add(obj, name, "string",
get ? property_get_str : NULL,
set ? property_set_str : NULL,
property_release_str,
prop, &local_err);
if (local_err) {
error_propagate(errp, local_err);
g_free(prop);
}
}
typedef struct BoolProperty
{
bool (*get)(Object *, Error **);
void (*set)(Object *, bool, Error **);
} BoolProperty;
static void property_get_bool(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
BoolProperty *prop = opaque;
bool value;
value = prop->get(obj, errp);
visit_type_bool(v, &value, name, errp);
}
static void property_set_bool(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
BoolProperty *prop = opaque;
bool value;
Error *local_err = NULL;
visit_type_bool(v, &value, name, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
prop->set(obj, value, errp);
}
static void property_release_bool(Object *obj, const char *name,
void *opaque)
{
BoolProperty *prop = opaque;
g_free(prop);
}
void object_property_add_bool(Object *obj, const char *name,
bool (*get)(Object *, Error **),
void (*set)(Object *, bool, Error **),
Error **errp)
{
Error *local_err = NULL;
BoolProperty *prop = g_malloc0(sizeof(*prop));
prop->get = get;
prop->set = set;
object_property_add(obj, name, "bool",
get ? property_get_bool : NULL,
set ? property_set_bool : NULL,
property_release_bool,
prop, &local_err);
if (local_err) {
error_propagate(errp, local_err);
g_free(prop);
}
}
static char *qdev_get_type(Object *obj, Error **errp)
{
return g_strdup(object_get_typename(obj));
}
static void property_get_uint8_ptr(Object *obj, Visitor *v,
void *opaque, const char *name,
Error **errp)
{
uint8_t value = *(uint8_t *)opaque;
visit_type_uint8(v, &value, name, errp);
}
static void property_get_uint16_ptr(Object *obj, Visitor *v,
void *opaque, const char *name,
Error **errp)
{
uint16_t value = *(uint16_t *)opaque;
visit_type_uint16(v, &value, name, errp);
}
static void property_get_uint32_ptr(Object *obj, Visitor *v,
void *opaque, const char *name,
Error **errp)
{
uint32_t value = *(uint32_t *)opaque;
visit_type_uint32(v, &value, name, errp);
}
static void property_get_uint64_ptr(Object *obj, Visitor *v,
void *opaque, const char *name,
Error **errp)
{
uint64_t value = *(uint64_t *)opaque;
visit_type_uint64(v, &value, name, errp);
}
void object_property_add_uint8_ptr(Object *obj, const char *name,
const uint8_t *v, Error **errp)
{
object_property_add(obj, name, "uint8", property_get_uint8_ptr,
NULL, NULL, (void *)v, errp);
}
void object_property_add_uint16_ptr(Object *obj, const char *name,
const uint16_t *v, Error **errp)
{
object_property_add(obj, name, "uint16", property_get_uint16_ptr,
NULL, NULL, (void *)v, errp);
}
void object_property_add_uint32_ptr(Object *obj, const char *name,
const uint32_t *v, Error **errp)
{
object_property_add(obj, name, "uint32", property_get_uint32_ptr,
NULL, NULL, (void *)v, errp);
}
void object_property_add_uint64_ptr(Object *obj, const char *name,
const uint64_t *v, Error **errp)
{
object_property_add(obj, name, "uint64", property_get_uint64_ptr,
NULL, NULL, (void *)v, errp);
}
static void object_instance_init(Object *obj)
{
object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
}
static void register_types(void)
{
static TypeInfo interface_info = {
.name = TYPE_INTERFACE,
.class_size = sizeof(InterfaceClass),
.abstract = true,
};
static TypeInfo object_info = {
.name = TYPE_OBJECT,
.instance_size = sizeof(Object),
.instance_init = object_instance_init,
.abstract = true,
};
type_interface = type_register_internal(&interface_info);
type_register_internal(&object_info);
}
type_init(register_types)
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