Fix comparison of `Callable`s from callable_mp() of the same method

include/godot_cpp/variant/callable_method_pointer.hpp

@@ -37,6 +37,17 @@
 namespace godot {
 
 class CallableCustomMethodPointerBase : public CallableCustomBase {
+	uint32_t *comp_ptr = nullptr;
+	uint32_t comp_size;
+	uint32_t h;
+
+protected:
+	void _setup(uint32_t *p_base_ptr, uint32_t p_ptr_size);
+
+public:
+	_FORCE_INLINE_ const uint32_t *get_comp_ptr() const { return comp_ptr; }
+	_FORCE_INLINE_ uint32_t get_comp_size() const { return comp_size; }
+	_FORCE_INLINE_ uint32_t get_hash() const { return h; }
 };
 
 namespace internal {
@@ -51,21 +62,26 @@ Callable create_callable_from_ccmp(CallableCustomMethodPointerBase *p_callable_m
 
 template <class T, class... P>
 class CallableCustomMethodPointer : public CallableCustomMethodPointerBase {
-	T *instance;
+	struct Data {
-	void (T::*method)(P...);
+		T *instance;
+		void (T::*method)(P...);
+	} data;
+	static_assert(sizeof(Data) % 4 == 0);
 
 public:
 	virtual ObjectID get_object() const override {
-		return ObjectID(instance->get_instance_id());
+		return ObjectID(data.instance->get_instance_id());
 	}
 
 	virtual void call(const Variant **p_arguments, int p_argcount, Variant &r_return_value, GDExtensionCallError &r_call_error) const override {
-		call_with_variant_args(instance, method, p_arguments, p_argcount, r_call_error);
+		call_with_variant_args(data.instance, data.method, p_arguments, p_argcount, r_call_error);
 	}
 
 	CallableCustomMethodPointer(T *p_instance, void (T::*p_method)(P...)) {
-		instance = p_instance;
+		memset(&data, 0, sizeof(Data));
-		method = p_method;
+		data.instance = p_instance;
+		data.method = p_method;
+		_setup((uint32_t *)&data, sizeof(Data));
 	}
 };
 
@@ -82,22 +98,27 @@ Callable create_custom_callable_function_pointer(T *p_instance, void (T::*p_meth
 
 template <class T, class R, class... P>
 class CallableCustomMethodPointerRet : public CallableCustomMethodPointerBase {
-	T *instance;
+	struct Data {
-	R(T::*method)
+		T *instance;
-	(P...);
+		R(T::*method)
+		(P...);
+	} data;
+	static_assert(sizeof(Data) % 4 == 0);
 
 public:
 	virtual ObjectID get_object() const override {
-		return ObjectID(instance->get_instance_id());
+		return ObjectID(data.instance->get_instance_id());
 	}
 
 	virtual void call(const Variant **p_arguments, int p_argcount, Variant &r_return_value, GDExtensionCallError &r_call_error) const override {
-		call_with_variant_args_ret(instance, method, p_arguments, p_argcount, r_return_value, r_call_error);
+		call_with_variant_args_ret(data.instance, data.method, p_arguments, p_argcount, r_return_value, r_call_error);
 	}
 
 	CallableCustomMethodPointerRet(T *p_instance, R (T::*p_method)(P...)) {
-		instance = p_instance;
+		memset(&data, 0, sizeof(Data));
-		method = p_method;
+		data.instance = p_instance;
+		data.method = p_method;
+		_setup((uint32_t *)&data, sizeof(Data));
 	}
 };
 
@@ -114,22 +135,27 @@ Callable create_custom_callable_function_pointer(T *p_instance, R (T::*p_method)
 
 template <class T, class R, class... P>
 class CallableCustomMethodPointerRetC : public CallableCustomMethodPointerBase {
-	T *instance;
+	struct Data {
-	R(T::*method)
+		T *instance;
-	(P...) const;
+		R(T::*method)
+		(P...) const;
+	} data;
+	static_assert(sizeof(Data) % 4 == 0);
 
 public:
 	virtual ObjectID get_object() const override {
-		return ObjectID(instance->get_instance_id());
+		return ObjectID(data.instance->get_instance_id());
 	}
 
 	virtual void call(const Variant **p_arguments, int p_argcount, Variant &r_return_value, GDExtensionCallError &r_call_error) const override {
-		call_with_variant_args_retc(instance, method, p_arguments, p_argcount, r_return_value, r_call_error);
+		call_with_variant_args_retc(data.instance, data.method, p_arguments, p_argcount, r_return_value, r_call_error);
 	}
 
 	CallableCustomMethodPointerRetC(const T *p_instance, R (T::*p_method)(P...) const) {
-		instance = const_cast<T *>(p_instance);
+		memset(&data, 0, sizeof(Data));
-		method = p_method;
+		data.instance = const_cast<T *>(p_instance);
+		data.method = p_method;
+		_setup((uint32_t *)&data, sizeof(Data));
 	}
 };
 
@@ -146,7 +172,10 @@ Callable create_custom_callable_function_pointer(const T *p_instance, R (T::*p_m
 
 template <class... P>
 class CallableCustomStaticMethodPointer : public CallableCustomMethodPointerBase {
-	void (*method)(P...);
+	struct Data {
+		void (*method)(P...);
+	} data;
+	static_assert(sizeof(Data) % 4 == 0);
 
 public:
 	virtual ObjectID get_object() const override {
@@ -154,12 +183,14 @@ public:
 	}
 
 	virtual void call(const Variant **p_arguments, int p_argcount, Variant &r_return_value, GDExtensionCallError &r_call_error) const override {
-		call_with_variant_args_static_ret(method, p_arguments, p_argcount, r_return_value, r_call_error);
+		call_with_variant_args_static_ret(data.method, p_arguments, p_argcount, r_return_value, r_call_error);
 		r_return_value = Variant();
 	}
 
 	CallableCustomStaticMethodPointer(void (*p_method)(P...)) {
-		method = p_method;
+		memset(&data, 0, sizeof(Data));
+		data.method = p_method;
+		_setup((uint32_t *)&data, sizeof(Data));
 	}
 };
 
@@ -176,8 +207,11 @@ Callable create_custom_callable_static_function_pointer(void (*p_method)(P...))
 
 template <class R, class... P>
 class CallableCustomStaticMethodPointerRet : public CallableCustomMethodPointerBase {
-	R(*method)
+	struct Data {
-	(P...);
+		R(*method)
+		(P...);
+	} data;
+	static_assert(sizeof(Data) % 4 == 0);
 
 public:
 	virtual ObjectID get_object() const override {
@@ -185,11 +219,13 @@ public:
 	}
 
 	virtual void call(const Variant **p_arguments, int p_argcount, Variant &r_return_value, GDExtensionCallError &r_call_error) const override {
-		call_with_variant_args_static_ret(method, p_arguments, p_argcount, r_return_value, r_call_error);
+		call_with_variant_args_static_ret(data.method, p_arguments, p_argcount, r_return_value, r_call_error);
 	}
 
 	CallableCustomStaticMethodPointerRet(R (*p_method)(P...)) {
-		method = p_method;
+		memset(&data, 0, sizeof(Data));
+		data.method = p_method;
+		_setup((uint32_t *)&data, sizeof(Data));
 	}
 };
 

src/variant/callable_method_pointer.cpp

@@ -30,18 +30,66 @@
 
 #include <godot_cpp/variant/callable_method_pointer.hpp>
 
+#include <godot_cpp/templates/hashfuncs.hpp>
+
 namespace godot {
 
-static void custom_callable_mp_call(void *userdata, const GDExtensionConstVariantPtr *p_args, GDExtensionInt p_argument_count, GDExtensionVariantPtr r_return, GDExtensionCallError *r_error) {
+static void custom_callable_mp_call(void *p_userdata, const GDExtensionConstVariantPtr *p_args, GDExtensionInt p_argument_count, GDExtensionVariantPtr r_return, GDExtensionCallError *r_error) {
-	CallableCustomMethodPointerBase *callable_method_pointer = (CallableCustomMethodPointerBase *)userdata;
+	CallableCustomMethodPointerBase *callable_method_pointer = (CallableCustomMethodPointerBase *)p_userdata;
 	callable_method_pointer->call((const Variant **)p_args, p_argument_count, *(Variant *)r_return, *r_error);
 }
 
-static void custom_callable_mp_free(void *userdata) {
+static GDExtensionBool custom_callable_mp_is_valid(void *p_userdata) {
-	CallableCustomMethodPointerBase *callable_method_pointer = (CallableCustomMethodPointerBase *)userdata;
+	CallableCustomMethodPointerBase *callable_method_pointer = (CallableCustomMethodPointerBase *)p_userdata;
+	ObjectID object = callable_method_pointer->get_object();
+	return object == ObjectID() || ObjectDB::get_instance(object);
+}
+
+static void custom_callable_mp_free(void *p_userdata) {
+	CallableCustomMethodPointerBase *callable_method_pointer = (CallableCustomMethodPointerBase *)p_userdata;
 	memdelete(callable_method_pointer);
 }
 
+static uint32_t custom_callable_mp_hash(void *p_userdata) {
+	CallableCustomMethodPointerBase *callable_method_pointer = (CallableCustomMethodPointerBase *)p_userdata;
+	return callable_method_pointer->get_hash();
+}
+
+static GDExtensionBool custom_callable_mp_equal_func(void *p_a, void *p_b) {
+	CallableCustomMethodPointerBase *a = (CallableCustomMethodPointerBase *)p_a;
+	CallableCustomMethodPointerBase *b = (CallableCustomMethodPointerBase *)p_b;
+
+	if (a->get_comp_size() != b->get_comp_size()) {
+		return false;
+	}
+
+	return memcmp(a->get_comp_ptr(), b->get_comp_ptr(), a->get_comp_size() * 4) == 0;
+}
+
+static GDExtensionBool custom_callable_mp_less_than_func(void *p_a, void *p_b) {
+	CallableCustomMethodPointerBase *a = (CallableCustomMethodPointerBase *)p_a;
+	CallableCustomMethodPointerBase *b = (CallableCustomMethodPointerBase *)p_b;
+
+	if (a->get_comp_size() != b->get_comp_size()) {
+		return a->get_comp_size() < b->get_comp_size();
+	}
+
+	return memcmp(a->get_comp_ptr(), b->get_comp_ptr(), a->get_comp_size() * 4) < 0;
+}
+
+void CallableCustomMethodPointerBase::_setup(uint32_t *p_base_ptr, uint32_t p_ptr_size) {
+	comp_ptr = p_base_ptr;
+	comp_size = p_ptr_size / 4;
+
+	for (uint32_t i = 0; i < comp_size; i++) {
+		if (i == 0) {
+			h = hash_murmur3_one_32(comp_ptr[i]);
+		} else {
+			h = hash_murmur3_one_32(comp_ptr[i], h);
+		}
+	}
+}
+
 namespace internal {
 
 Callable create_callable_from_ccmp(CallableCustomMethodPointerBase *p_callable_method_pointer) {
@@ -50,7 +98,11 @@ Callable create_callable_from_ccmp(CallableCustomMethodPointerBase *p_callable_m
 	info.token = internal::token;
 	info.object_id = p_callable_method_pointer->get_object();
 	info.call_func = &custom_callable_mp_call;
+	info.is_valid_func = &custom_callable_mp_is_valid;
 	info.free_func = &custom_callable_mp_free;
+	info.hash_func = &custom_callable_mp_hash;
+	info.equal_func = &custom_callable_mp_equal_func;
+	info.less_than_func = &custom_callable_mp_less_than_func;
 
 	Callable callable;
 	::godot::internal::gdextension_interface_callable_custom_create(callable._native_ptr(), &info);

test/project/main.gd

@@ -101,9 +101,20 @@ func _ready():
 
 	# mp_callable() with void method.
 	var mp_callable: Callable = example.test_callable_mp()
+	assert_equal(mp_callable.is_valid(), true)
 	mp_callable.call(example, "void", 36)
 	assert_equal(custom_signal_emitted, ["unbound_method1: Example - void", 36])
 
+	# Check that it works with is_connected().
+	assert_equal(example.renamed.is_connected(mp_callable), false)
+	example.renamed.connect(mp_callable)
+	assert_equal(example.renamed.is_connected(mp_callable), true)
+	# Make sure a new object is still treated as equivalent.
+	assert_equal(example.renamed.is_connected(example.test_callable_mp()), true)
+	assert_equal(mp_callable.hash(), example.test_callable_mp().hash())
+	example.renamed.disconnect(mp_callable)
+	assert_equal(example.renamed.is_connected(mp_callable), false)
+
 	# mp_callable() with return value.
 	var mp_callable_ret: Callable = example.test_callable_mp_ret()
 	assert_equal(mp_callable_ret.call(example, "test", 77), "unbound_method2: Example - test - 77")
@@ -117,6 +128,16 @@ func _ready():
 	mp_callable_static.call(example, "static", 83)
 	assert_equal(custom_signal_emitted, ["unbound_static_method1: Example - static", 83])
 
+	# Check that it works with is_connected().
+	assert_equal(example.renamed.is_connected(mp_callable_static), false)
+	example.renamed.connect(mp_callable_static)
+	assert_equal(example.renamed.is_connected(mp_callable_static), true)
+	# Make sure a new object is still treated as equivalent.
+	assert_equal(example.renamed.is_connected(example.test_callable_mp_static()), true)
+	assert_equal(mp_callable_static.hash(), example.test_callable_mp_static().hash())
+	example.renamed.disconnect(mp_callable_static)
+	assert_equal(example.renamed.is_connected(mp_callable_static), false)
+
 	# mp_callable_static() with return value.
 	var mp_callable_static_ret: Callable = example.test_callable_mp_static_ret()
 	assert_equal(mp_callable_static_ret.call(example, "static-ret", 84), "unbound_static_method2: Example - static-ret - 84")