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Make overriding of vfuncs safer

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It can only be called from the correct class_init() now
This commit is contained in:
Sebastian Dröge 2017-09-26 01:50:56 +03:00
parent 41d6343682
commit ec1903a571
4 changed files with 14 additions and 15 deletions
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8
gst-plugin/src/base_sink.rs
View file

@ -75,7 +75,7 @@ pub unsafe trait BaseSinkClass<T: BaseSink>
where where
T::ImplType: BaseSinkImpl<T>, T::ImplType: BaseSinkImpl<T>,
{ {
fn override_vfuncs(&mut self) { fn override_vfuncs(&mut self, _: &ClassInitToken) {
unsafe { unsafe {
let klass = &mut *(self as *const Self as *mut gst_base_ffi::GstBaseSinkClass); let klass = &mut *(self as *const Self as *mut gst_base_ffi::GstBaseSinkClass);
klass.start = Some(base_sink_start::<T>); klass.start = Some(base_sink_start::<T>);
@ -149,9 +149,9 @@ impl ObjectType for RsBaseSink {
unsafe { from_glib(gst_base_ffi::gst_base_sink_get_type()) } unsafe { from_glib(gst_base_ffi::gst_base_sink_get_type()) }
} }
fn class_init(klass: &mut RsBaseSinkClass) { fn class_init(token: &ClassInitToken, klass: &mut RsBaseSinkClass) {
ElementClass::override_vfuncs(klass); ElementClass::override_vfuncs(klass, token);
BaseSinkClass::override_vfuncs(klass); BaseSinkClass::override_vfuncs(klass, token);
} }
object_type_fns!(); object_type_fns!();

8
gst-plugin/src/base_src.rs
View file

@ -103,7 +103,7 @@ pub unsafe trait BaseSrcClass<T: BaseSrc>
where where
T::ImplType: BaseSrcImpl<T>, T::ImplType: BaseSrcImpl<T>,
{ {
fn override_vfuncs(&mut self) { fn override_vfuncs(&mut self, _: &ClassInitToken) {
unsafe { unsafe {
let klass = &mut *(self as *const Self as *mut gst_base_ffi::GstBaseSrcClass); let klass = &mut *(self as *const Self as *mut gst_base_ffi::GstBaseSrcClass);
klass.start = Some(base_src_start::<T>); klass.start = Some(base_src_start::<T>);
@ -201,9 +201,9 @@ impl ObjectType for RsBaseSrc {
unsafe { from_glib(gst_base_ffi::gst_base_src_get_type()) } unsafe { from_glib(gst_base_ffi::gst_base_src_get_type()) }
} }
fn class_init(klass: &mut RsBaseSrcClass) { fn class_init(token: &ClassInitToken, klass: &mut RsBaseSrcClass) {
ElementClass::override_vfuncs(klass); ElementClass::override_vfuncs(klass, token);
BaseSrcClass::override_vfuncs(klass); BaseSrcClass::override_vfuncs(klass, token);
} }
object_type_fns!(); object_type_fns!();

6
gst-plugin/src/element.rs
View file

@ -76,7 +76,7 @@ where
} }
} }
fn override_vfuncs(&mut self) { fn override_vfuncs(&mut self, _: &ClassInitToken) {
unsafe { unsafe {
let klass = &mut *(self as *const Self as *mut gst_ffi::GstElementClass); let klass = &mut *(self as *const Self as *mut gst_ffi::GstElementClass);
klass.change_state = Some(element_change_state::<T>); klass.change_state = Some(element_change_state::<T>);
@ -129,8 +129,8 @@ impl ObjectType for RsElement {
unsafe { from_glib(gst_ffi::gst_element_get_type()) } unsafe { from_glib(gst_ffi::gst_element_get_type()) }
} }
fn class_init(klass: &mut RsElementClass) { fn class_init(token: &ClassInitToken, klass: &mut RsElementClass) {
klass.override_vfuncs(); klass.override_vfuncs(token);
} }
object_type_fns!(); object_type_fns!();

7
gst-plugin/src/object.rs
View file

@ -56,12 +56,11 @@ macro_rules! box_object_impl(
pub trait ImplTypeStatic<T: ObjectType>: Send + Sync + 'static { pub trait ImplTypeStatic<T: ObjectType>: Send + Sync + 'static {
fn get_name(&self) -> &str; fn get_name(&self) -> &str;
fn new(&self, &T) -> T::ImplType; fn new(&self, &T) -> T::ImplType;
// FIXME: Needs token, needs to become override_vfuncs()
// override_vfuncs() functions need to take token
fn class_init(&self, &mut ClassStruct<T>); fn class_init(&self, &mut ClassStruct<T>);
fn type_init(&self, _: &TypeInitToken, _type_: glib::Type) {} fn type_init(&self, _: &TypeInitToken, _type_: glib::Type) {}
} }
pub struct ClassInitToken(());
pub struct TypeInitToken(()); pub struct TypeInitToken(());
pub trait ObjectType: FromGlibPtrBorrow<*mut InstanceStruct<Self>> + 'static pub trait ObjectType: FromGlibPtrBorrow<*mut InstanceStruct<Self>> + 'static
@ -75,7 +74,7 @@ where
fn glib_type() -> glib::Type; fn glib_type() -> glib::Type;
fn class_init(klass: &mut ClassStruct<Self>); fn class_init(token: &ClassInitToken, klass: &mut ClassStruct<Self>);
fn set_property(_obj: &Self, _id: u32, _value: &glib::Value) { fn set_property(_obj: &Self, _id: u32, _value: &glib::Value) {
unimplemented!() unimplemented!()
@ -381,7 +380,7 @@ unsafe extern "C" fn class_init<T: ObjectType>(
klass.parent_class = gobject_ffi::g_type_class_peek_parent( klass.parent_class = gobject_ffi::g_type_class_peek_parent(
klass as *mut _ as glib_ffi::gpointer, klass as *mut _ as glib_ffi::gpointer,
) as *const T::GlibClassType; ) as *const T::GlibClassType;
T::class_init(klass); T::class_init(&ClassInitToken(()), klass);
} }
} }