Notify instance binding data api of refcount increment/decrement

This commit is contained in:
Ignacio Etcheverry 2018-02-22 15:34:08 +01:00
parent 79a225ac2a
commit 908a30964a
10 changed files with 129 additions and 23 deletions

View file

@ -1825,7 +1825,11 @@ void *Object::get_script_instance_binding(int p_script_language_index) {
//as it should not really affect performance much (won't be called too often), as in far most caes the condition below will be false afterwards
if (!_script_instance_bindings[p_script_language_index]) {
_script_instance_bindings[p_script_language_index] = ScriptServer::get_language(p_script_language_index)->alloc_instance_binding_data(this);
void *script_data = ScriptServer::get_language(p_script_language_index)->alloc_instance_binding_data(this);
if (script_data) {
atomic_increment(&instance_binding_count);
_script_instance_bindings[p_script_language_index] = script_data;
}
}
return _script_instance_bindings[p_script_language_index];
@ -1840,6 +1844,7 @@ Object::Object() {
_instance_ID = ObjectDB::add_instance(this);
_can_translate = true;
_is_queued_for_deletion = false;
instance_binding_count = 0;
memset(_script_instance_bindings, 0, sizeof(void *) * MAX_SCRIPT_INSTANCE_BINDINGS);
script_instance = NULL;
#ifdef TOOLS_ENABLED

View file

@ -484,10 +484,12 @@ private:
void _set_indexed_bind(const NodePath &p_name, const Variant &p_value);
Variant _get_indexed_bind(const NodePath &p_name) const;
void *_script_instance_bindings[MAX_SCRIPT_INSTANCE_BINDINGS];
void property_list_changed_notify();
friend class Reference;
uint32_t instance_binding_count;
void *_script_instance_bindings[MAX_SCRIPT_INSTANCE_BINDINGS];
protected:
virtual void _initialize_classv() { initialize_class(); }
virtual bool _setv(const StringName &p_name, const Variant &p_property) { return false; };

View file

@ -66,8 +66,17 @@ int Reference::reference_get_count() const {
bool Reference::reference() {
bool success = refcount.ref();
if (success && get_script_instance()) {
get_script_instance()->refcount_incremented();
if (success && refcount.get() <= 2 /* higher is not relevant */) {
if (get_script_instance()) {
get_script_instance()->refcount_incremented();
}
if (instance_binding_count > 0) {
for (int i = 0; i < MAX_SCRIPT_INSTANCE_BINDINGS; i++) {
if (_script_instance_bindings[i]) {
ScriptServer::get_language(i)->refcount_incremented_instance_binding(this);
}
}
}
}
return success;
@ -77,9 +86,19 @@ bool Reference::unreference() {
bool die = refcount.unref();
if (get_script_instance()) {
bool script_ret = get_script_instance()->refcount_decremented();
die = die && script_ret;
if (refcount.get() <= 1 /* higher is not relevant */) {
if (get_script_instance()) {
bool script_ret = get_script_instance()->refcount_decremented();
die = die && script_ret;
}
if (instance_binding_count > 0) {
for (int i = 0; i < MAX_SCRIPT_INSTANCE_BINDINGS; i++) {
if (_script_instance_bindings[i]) {
bool script_ret = ScriptServer::get_language(i)->refcount_decremented_instance_binding(this);
die = die && script_ret;
}
}
}
}
return die;

View file

@ -284,6 +284,8 @@ public:
virtual void *alloc_instance_binding_data(Object *p_object) { return NULL; } //optional, not used by all languages
virtual void free_instance_binding_data(void *p_data) {} //optional, not used by all languages
virtual void refcount_incremented_instance_binding(Object *p_object) {} //optional, not used by all languages
virtual bool refcount_decremented_instance_binding(Object *p_object) { return true; } //return true if it can die //optional, not used by all languages
virtual void frame();

View file

@ -955,6 +955,69 @@ void CSharpLanguage::free_instance_binding_data(void *p_data) {
#endif
}
void CSharpLanguage::refcount_incremented_instance_binding(Object *p_object) {
Reference *ref_owner = Object::cast_to<Reference>(p_object);
#ifdef DEBUG_ENABLED
CRASH_COND(!ref_owner);
#endif
void *data = p_object->get_script_instance_binding(get_language_index());
if (!data)
return;
Ref<MonoGCHandle> &gchandle = ((Map<Object *, Ref<MonoGCHandle> >::Element *)data)->get();
if (ref_owner->reference_get_count() > 1 && gchandle->is_weak()) { // The managed side also holds a reference, hence 1 instead of 0
// The reference count was increased after the managed side was the only one referencing our owner.
// This means the owner is being referenced again by the unmanaged side,
// so the owner must hold the managed side alive again to avoid it from being GCed.
MonoObject *target = gchandle->get_target();
if (!target)
return; // Called after the managed side was collected, so nothing to do here
// Release the current weak handle and replace it with a strong handle.
uint32_t strong_gchandle = MonoGCHandle::make_strong_handle(target);
gchandle->release();
gchandle->set_handle(strong_gchandle, MonoGCHandle::STRONG_HANDLE);
}
}
bool CSharpLanguage::refcount_decremented_instance_binding(Object *p_object) {
Reference *ref_owner = Object::cast_to<Reference>(p_object);
#ifdef DEBUG_ENABLED
CRASH_COND(!ref_owner);
#endif
int refcount = ref_owner->reference_get_count();
void *data = p_object->get_script_instance_binding(get_language_index());
if (!data)
return refcount == 0;
Ref<MonoGCHandle> &gchandle = ((Map<Object *, Ref<MonoGCHandle> >::Element *)data)->get();
if (refcount == 1 && !gchandle->is_weak()) { // The managed side also holds a reference, hence 1 instead of 0
// If owner owner is no longer referenced by the unmanaged side,
// the managed instance takes responsibility of deleting the owner when GCed.
MonoObject *target = gchandle->get_target();
if (!target)
return refcount == 0; // Called after the managed side was collected, so nothing to do here
// Release the current strong handle and replace it with a weak handle.
uint32_t weak_gchandle = MonoGCHandle::make_weak_handle(target);
gchandle->release();
gchandle->set_handle(weak_gchandle, MonoGCHandle::WEAK_HANDLE);
return false;
}
return refcount == 0;
}
CSharpInstance *CSharpInstance::create_for_managed_type(Object *p_owner, CSharpScript *p_script, const Ref<MonoGCHandle> &p_gchandle) {
CSharpInstance *instance = memnew(CSharpInstance);
@ -1245,11 +1308,13 @@ void CSharpInstance::mono_object_disposed() {
void CSharpInstance::refcount_incremented() {
#ifdef DEBUG_ENABLED
CRASH_COND(!base_ref);
#endif
Reference *ref_owner = Object::cast_to<Reference>(owner);
if (ref_owner->reference_get_count() > 1) { // The managed side also holds a reference, hence 1 instead of 0
if (ref_owner->reference_get_count() > 1 && gchandle->is_weak()) { // The managed side also holds a reference, hence 1 instead of 0
// The reference count was increased after the managed side was the only one referencing our owner.
// This means the owner is being referenced again by the unmanaged side,
// so the owner must hold the managed side alive again to avoid it from being GCed.
@ -1257,26 +1322,28 @@ void CSharpInstance::refcount_incremented() {
// Release the current weak handle and replace it with a strong handle.
uint32_t strong_gchandle = MonoGCHandle::make_strong_handle(gchandle->get_target());
gchandle->release();
gchandle->set_handle(strong_gchandle);
gchandle->set_handle(strong_gchandle, MonoGCHandle::STRONG_HANDLE);
}
}
bool CSharpInstance::refcount_decremented() {
#ifdef DEBUG_ENABLED
CRASH_COND(!base_ref);
#endif
Reference *ref_owner = Object::cast_to<Reference>(owner);
int refcount = ref_owner->reference_get_count();
if (refcount == 1) { // The managed side also holds a reference, hence 1 instead of 0
if (refcount == 1 && !gchandle->is_weak()) { // The managed side also holds a reference, hence 1 instead of 0
// If owner owner is no longer referenced by the unmanaged side,
// the managed instance takes responsibility of deleting the owner when GCed.
// Release the current strong handle and replace it with a weak handle.
uint32_t weak_gchandle = MonoGCHandle::make_weak_handle(gchandle->get_target());
gchandle->release();
gchandle->set_handle(weak_gchandle);
gchandle->set_handle(weak_gchandle, MonoGCHandle::WEAK_HANDLE);
return false;
}

View file

@ -345,6 +345,8 @@ public:
// Don't use these. I'm watching you
virtual void *alloc_instance_binding_data(Object *p_object);
virtual void free_instance_binding_data(void *p_data);
virtual void refcount_incremented_instance_binding(Object *p_object);
virtual bool refcount_decremented_instance_binding(Object *p_object);
#ifdef DEBUG_ENABLED
Vector<StackInfo> stack_trace_get_info(MonoObject *p_stack_trace);

View file

@ -47,12 +47,12 @@ uint32_t MonoGCHandle::make_weak_handle(MonoObject *p_object) {
Ref<MonoGCHandle> MonoGCHandle::create_strong(MonoObject *p_object) {
return memnew(MonoGCHandle(make_strong_handle(p_object)));
return memnew(MonoGCHandle(make_strong_handle(p_object), STRONG_HANDLE));
}
Ref<MonoGCHandle> MonoGCHandle::create_weak(MonoObject *p_object) {
return memnew(MonoGCHandle(make_weak_handle(p_object)));
return memnew(MonoGCHandle(make_weak_handle(p_object), WEAK_HANDLE));
}
void MonoGCHandle::release() {
@ -67,9 +67,10 @@ void MonoGCHandle::release() {
}
}
MonoGCHandle::MonoGCHandle(uint32_t p_handle) {
MonoGCHandle::MonoGCHandle(uint32_t p_handle, HandleType p_handle_type) {
released = false;
weak = p_handle_type == WEAK_HANDLE;
handle = p_handle;
}

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@ -40,24 +40,33 @@ class MonoGCHandle : public Reference {
GDCLASS(MonoGCHandle, Reference)
bool released;
bool weak;
uint32_t handle;
public:
enum HandleType {
STRONG_HANDLE,
WEAK_HANDLE
};
static uint32_t make_strong_handle(MonoObject *p_object);
static uint32_t make_weak_handle(MonoObject *p_object);
static Ref<MonoGCHandle> create_strong(MonoObject *p_object);
static Ref<MonoGCHandle> create_weak(MonoObject *p_object);
_FORCE_INLINE_ bool is_weak() { return weak; }
_FORCE_INLINE_ MonoObject *get_target() const { return released ? NULL : mono_gchandle_get_target(handle); }
_FORCE_INLINE_ void set_handle(uint32_t p_handle) {
handle = p_handle;
_FORCE_INLINE_ void set_handle(uint32_t p_handle, HandleType p_handle_type) {
released = false;
weak = p_handle_type == WEAK_HANDLE;
handle = p_handle;
}
void release();
MonoGCHandle(uint32_t p_handle);
MonoGCHandle(uint32_t p_handle, HandleType p_handle_type);
~MonoGCHandle();
};

View file

@ -42,8 +42,7 @@ Error connect_signal_awaiter(Object *p_source, const String &p_signal, Object *p
ERR_FAIL_NULL_V(p_source, ERR_INVALID_DATA);
ERR_FAIL_NULL_V(p_target, ERR_INVALID_DATA);
uint32_t awaiter_handle = MonoGCHandle::make_strong_handle(p_awaiter);
Ref<SignalAwaiterHandle> sa_con = memnew(SignalAwaiterHandle(awaiter_handle));
Ref<SignalAwaiterHandle> sa_con = memnew(SignalAwaiterHandle(p_awaiter));
#ifdef DEBUG_ENABLED
sa_con->set_connection_target(p_target);
#endif
@ -117,8 +116,8 @@ void SignalAwaiterHandle::_bind_methods() {
ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "_signal_callback", &SignalAwaiterHandle::_signal_callback, MethodInfo("_signal_callback"));
}
SignalAwaiterHandle::SignalAwaiterHandle(uint32_t p_managed_handle) :
MonoGCHandle(p_managed_handle) {
SignalAwaiterHandle::SignalAwaiterHandle(MonoObject *p_managed) :
MonoGCHandle(MonoGCHandle::make_strong_handle(p_managed), STRONG_HANDLE) {
#ifdef DEBUG_ENABLED
conn_target_id = 0;

View file

@ -64,7 +64,7 @@ public:
}
#endif
SignalAwaiterHandle(uint32_t p_managed_handle);
SignalAwaiterHandle(MonoObject *p_managed);
~SignalAwaiterHandle();
};