Fix C# bindings after recent breaking changes

Implementation for new Variant types Callable, Signal, StringName.
Added support for PackedInt64Array and PackedFloat64Array.

Add generation of signal members as events, as well as support for
user created signals as events.
NOTE: As of now, raising such events will not emit the signal. As such,
one must use `EmitSignal` instead of raising the event directly.

Removed old ThreadLocal fallback class. It's safe to use thread_local now since
it's supported on all minimum versions of compilers we support.

1 files changed, 297 insertions, 71 deletions

diff --git a/modules/mono/mono_gd/gd_mono_marshal.cpp b/modules/mono/mono_gd/gd_mono_marshal.cpp
index 695be64d6e..f937e09eaf 100644
--- a/modules/mono/mono_gd/gd_mono_marshal.cpp
+++ b/modules/mono/mono_gd/gd_mono_marshal.cpp
@@ -30,13 +30,14 @@
 
 #include "gd_mono_marshal.h"
 
+#include "../signal_awaiter_utils.h"
 #include "gd_mono.h"
 #include "gd_mono_cache.h"
 #include "gd_mono_class.h"
 
 namespace GDMonoMarshal {
 
-Variant::Type managed_to_variant_type(const ManagedType &p_type) {
+Variant::Type managed_to_variant_type(const ManagedType &p_type, bool *r_nil_is_variant) {
 	switch (p_type.type_encoding) {
 		case MONO_TYPE_BOOLEAN:
 			return Variant::BOOL;
@@ -101,6 +102,12 @@ Variant::Type managed_to_variant_type(const ManagedType &p_type) {
 			if (vtclass == CACHED_CLASS(Plane))
 				return Variant::PLANE;
 
+			if (vtclass == CACHED_CLASS(Callable))
+				return Variant::CALLABLE;
+
+			if (vtclass == CACHED_CLASS(SignalInfo))
+				return Variant::SIGNAL;
+
 			if (mono_class_is_enum(vtclass->get_mono_ptr()))
 				return Variant::INT;
 		} break;
@@ -118,9 +125,15 @@ Variant::Type managed_to_variant_type(const ManagedType &p_type) {
 			if (array_type->eklass == CACHED_CLASS_RAW(int32_t))
 				return Variant::PACKED_INT32_ARRAY;
 
-			if (array_type->eklass == REAL_T_MONOCLASS)
+			if (array_type->eklass == CACHED_CLASS_RAW(int64_t))
+				return Variant::PACKED_INT64_ARRAY;
+
+			if (array_type->eklass == CACHED_CLASS_RAW(float))
 				return Variant::PACKED_FLOAT32_ARRAY;
 
+			if (array_type->eklass == CACHED_CLASS_RAW(double))
+				return Variant::PACKED_FLOAT64_ARRAY;
+
 			if (array_type->eklass == CACHED_CLASS_RAW(String))
 				return Variant::PACKED_STRING_ARRAY;
 
@@ -142,6 +155,10 @@ Variant::Type managed_to_variant_type(const ManagedType &p_type) {
 				return Variant::OBJECT;
 			}
 
+			if (CACHED_CLASS(StringName) == type_class) {
+				return Variant::STRING_NAME;
+			}
+
 			if (CACHED_CLASS(NodePath) == type_class) {
 				return Variant::NODE_PATH;
 			}
@@ -179,6 +196,12 @@ Variant::Type managed_to_variant_type(const ManagedType &p_type) {
 			}
 		} break;
 
+		case MONO_TYPE_OBJECT: {
+			if (r_nil_is_variant)
+				*r_nil_is_variant = true;
+			return Variant::NIL;
+		} break;
+
 		case MONO_TYPE_GENERICINST: {
 			MonoReflectionType *reftype = mono_type_get_object(mono_domain_get(), p_type.type_class->get_mono_type());
 
@@ -211,6 +234,9 @@ Variant::Type managed_to_variant_type(const ManagedType &p_type) {
 		} break;
 	}
 
+	if (r_nil_is_variant)
+		*r_nil_is_variant = false;
+
 	// Unknown
 	return Variant::NIL;
 }
@@ -432,6 +458,16 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 				return mono_value_box(mono_domain_get(), CACHED_CLASS_RAW(Plane), &from);
 			}
 
+			if (vtclass == CACHED_CLASS(Callable)) {
+				GDMonoMarshal::M_Callable from = GDMonoMarshal::callable_to_managed(p_var->operator Callable());
+				return mono_value_box(mono_domain_get(), CACHED_CLASS_RAW(Callable), &from);
+			}
+
+			if (vtclass == CACHED_CLASS(SignalInfo)) {
+				GDMonoMarshal::M_SignalInfo from = GDMonoMarshal::signal_info_to_managed(p_var->operator Signal());
+				return mono_value_box(mono_domain_get(), CACHED_CLASS_RAW(SignalInfo), &from);
+			}
+
 			if (mono_class_is_enum(vtclass->get_mono_ptr())) {
 				MonoType *enum_basetype = mono_class_enum_basetype(vtclass->get_mono_ptr());
 				MonoClass *enum_baseclass = mono_class_from_mono_type(enum_basetype);
@@ -496,9 +532,15 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 			if (array_type->eklass == CACHED_CLASS_RAW(int32_t))
 				return (MonoObject *)PackedInt32Array_to_mono_array(p_var->operator PackedInt32Array());
 
-			if (array_type->eklass == REAL_T_MONOCLASS)
+			if (array_type->eklass == CACHED_CLASS_RAW(int64_t))
+				return (MonoObject *)PackedInt64Array_to_mono_array(p_var->operator PackedInt64Array());
+
+			if (array_type->eklass == CACHED_CLASS_RAW(float))
 				return (MonoObject *)PackedFloat32Array_to_mono_array(p_var->operator PackedFloat32Array());
 
+			if (array_type->eklass == CACHED_CLASS_RAW(double))
+				return (MonoObject *)PackedFloat64Array_to_mono_array(p_var->operator PackedFloat64Array());
+
 			if (array_type->eklass == CACHED_CLASS_RAW(String))
 				return (MonoObject *)PackedStringArray_to_mono_array(p_var->operator PackedStringArray());
 
@@ -522,6 +564,10 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 				return GDMonoUtils::unmanaged_get_managed(p_var->operator Object *());
 			}
 
+			if (CACHED_CLASS(StringName) == type_class) {
+				return GDMonoUtils::create_managed_from(p_var->operator StringName());
+			}
+
 			if (CACHED_CLASS(NodePath) == type_class) {
 				return GDMonoUtils::create_managed_from(p_var->operator NodePath());
 			}
@@ -628,12 +674,22 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 					GDMonoMarshal::M_Color from = MARSHALLED_OUT(Color, p_var->operator ::Color());
 					return mono_value_box(mono_domain_get(), CACHED_CLASS_RAW(Color), &from);
 				}
+				case Variant::STRING_NAME:
+					return GDMonoUtils::create_managed_from(p_var->operator StringName());
 				case Variant::NODE_PATH:
 					return GDMonoUtils::create_managed_from(p_var->operator NodePath());
 				case Variant::_RID:
 					return GDMonoUtils::create_managed_from(p_var->operator RID());
 				case Variant::OBJECT:
 					return GDMonoUtils::unmanaged_get_managed(p_var->operator Object *());
+				case Variant::CALLABLE: {
+					GDMonoMarshal::M_Callable from = GDMonoMarshal::callable_to_managed(p_var->operator Callable());
+					return mono_value_box(mono_domain_get(), CACHED_CLASS_RAW(Callable), &from);
+				}
+				case Variant::SIGNAL: {
+					GDMonoMarshal::M_SignalInfo from = GDMonoMarshal::signal_info_to_managed(p_var->operator Signal());
+					return mono_value_box(mono_domain_get(), CACHED_CLASS_RAW(SignalInfo), &from);
+				}
 				case Variant::DICTIONARY:
 					return GDMonoUtils::create_managed_from(p_var->operator Dictionary(), CACHED_CLASS(Dictionary));
 				case Variant::ARRAY:
@@ -642,8 +698,12 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 					return (MonoObject *)PackedByteArray_to_mono_array(p_var->operator PackedByteArray());
 				case Variant::PACKED_INT32_ARRAY:
 					return (MonoObject *)PackedInt32Array_to_mono_array(p_var->operator PackedInt32Array());
+				case Variant::PACKED_INT64_ARRAY:
+					return (MonoObject *)PackedInt64Array_to_mono_array(p_var->operator PackedInt64Array());
 				case Variant::PACKED_FLOAT32_ARRAY:
 					return (MonoObject *)PackedFloat32Array_to_mono_array(p_var->operator PackedFloat32Array());
+				case Variant::PACKED_FLOAT64_ARRAY:
+					return (MonoObject *)PackedFloat64Array_to_mono_array(p_var->operator PackedFloat64Array());
 				case Variant::PACKED_STRING_ARRAY:
 					return (MonoObject *)PackedStringArray_to_mono_array(p_var->operator PackedStringArray());
 				case Variant::PACKED_VECTOR2_ARRAY:
@@ -744,34 +804,40 @@ Variant mono_object_to_variant_impl(MonoObject *p_obj, const ManagedType &p_type
 			GDMonoClass *vtclass = p_type.type_class;
 
 			if (vtclass == CACHED_CLASS(Vector2))
-				return MARSHALLED_IN(Vector2, (GDMonoMarshal::M_Vector2 *)mono_object_unbox(p_obj));
+				return MARSHALLED_IN(Vector2, unbox_addr<GDMonoMarshal::M_Vector2>(p_obj));
 
 			if (vtclass == CACHED_CLASS(Rect2))
-				return MARSHALLED_IN(Rect2, (GDMonoMarshal::M_Rect2 *)mono_object_unbox(p_obj));
+				return MARSHALLED_IN(Rect2, unbox_addr<GDMonoMarshal::M_Rect2>(p_obj));
 
 			if (vtclass == CACHED_CLASS(Transform2D))
-				return MARSHALLED_IN(Transform2D, (GDMonoMarshal::M_Transform2D *)mono_object_unbox(p_obj));
+				return MARSHALLED_IN(Transform2D, unbox_addr<GDMonoMarshal::M_Transform2D>(p_obj));
 
 			if (vtclass == CACHED_CLASS(Vector3))
-				return MARSHALLED_IN(Vector3, (GDMonoMarshal::M_Vector3 *)mono_object_unbox(p_obj));
+				return MARSHALLED_IN(Vector3, unbox_addr<GDMonoMarshal::M_Vector3>(p_obj));
 
 			if (vtclass == CACHED_CLASS(Basis))
-				return MARSHALLED_IN(Basis, (GDMonoMarshal::M_Basis *)mono_object_unbox(p_obj));
+				return MARSHALLED_IN(Basis, unbox_addr<GDMonoMarshal::M_Basis>(p_obj));
 
 			if (vtclass == CACHED_CLASS(Quat))
-				return MARSHALLED_IN(Quat, (GDMonoMarshal::M_Quat *)mono_object_unbox(p_obj));
+				return MARSHALLED_IN(Quat, unbox_addr<GDMonoMarshal::M_Quat>(p_obj));
 
 			if (vtclass == CACHED_CLASS(Transform))
-				return MARSHALLED_IN(Transform, (GDMonoMarshal::M_Transform *)mono_object_unbox(p_obj));
+				return MARSHALLED_IN(Transform, unbox_addr<GDMonoMarshal::M_Transform>(p_obj));
 
 			if (vtclass == CACHED_CLASS(AABB))
-				return MARSHALLED_IN(AABB, (GDMonoMarshal::M_AABB *)mono_object_unbox(p_obj));
+				return MARSHALLED_IN(AABB, unbox_addr<GDMonoMarshal::M_AABB>(p_obj));
 
 			if (vtclass == CACHED_CLASS(Color))
-				return MARSHALLED_IN(Color, (GDMonoMarshal::M_Color *)mono_object_unbox(p_obj));
+				return MARSHALLED_IN(Color, unbox_addr<GDMonoMarshal::M_Color>(p_obj));
 
 			if (vtclass == CACHED_CLASS(Plane))
-				return MARSHALLED_IN(Plane, (GDMonoMarshal::M_Plane *)mono_object_unbox(p_obj));
+				return MARSHALLED_IN(Plane, unbox_addr<GDMonoMarshal::M_Plane>(p_obj));
+
+			if (vtclass == CACHED_CLASS(Callable))
+				return managed_to_callable(unbox<GDMonoMarshal::M_Callable>(p_obj));
+
+			if (vtclass == CACHED_CLASS(SignalInfo))
+				return managed_to_signal_info(unbox<GDMonoMarshal::M_SignalInfo>(p_obj));
 
 			if (mono_class_is_enum(vtclass->get_mono_ptr()))
 				return unbox<int32_t>(p_obj);
@@ -790,9 +856,15 @@ Variant mono_object_to_variant_impl(MonoObject *p_obj, const ManagedType &p_type
 			if (array_type->eklass == CACHED_CLASS_RAW(int32_t))
 				return mono_array_to_PackedInt32Array((MonoArray *)p_obj);
 
-			if (array_type->eklass == REAL_T_MONOCLASS)
+			if (array_type->eklass == CACHED_CLASS_RAW(int64_t))
+				return mono_array_to_PackedInt64Array((MonoArray *)p_obj);
+
+			if (array_type->eklass == CACHED_CLASS_RAW(float))
 				return mono_array_to_PackedFloat32Array((MonoArray *)p_obj);
 
+			if (array_type->eklass == CACHED_CLASS_RAW(double))
+				return mono_array_to_PackedFloat64Array((MonoArray *)p_obj);
+
 			if (array_type->eklass == CACHED_CLASS_RAW(String))
 				return mono_array_to_PackedStringArray((MonoArray *)p_obj);
 
@@ -825,6 +897,11 @@ Variant mono_object_to_variant_impl(MonoObject *p_obj, const ManagedType &p_type
 				return Variant();
 			}
 
+			if (CACHED_CLASS(StringName) == type_class) {
+				StringName *ptr = unbox<StringName *>(CACHED_FIELD(StringName, ptr)->get_value(p_obj));
+				return ptr ? Variant(*ptr) : Variant();
+			}
+
 			if (CACHED_CLASS(NodePath) == type_class) {
 				NodePath *ptr = unbox<NodePath *>(CACHED_FIELD(NodePath, ptr)->get_value(p_obj));
 				return ptr ? Variant(*ptr) : Variant();
@@ -960,9 +1037,10 @@ String mono_object_to_variant_string(MonoObject *p_obj, MonoException **r_exc) {
 }
 
 MonoArray *Array_to_mono_array(const Array &p_array) {
-	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(MonoObject), p_array.size());
+	int length = p_array.size();
+	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(MonoObject), length);
 
-	for (int i = 0; i < p_array.size(); i++) {
+	for (int i = 0; i < length; i++) {
 		MonoObject *boxed = variant_to_mono_object(p_array[i]);
 		mono_array_setref(ret, i, boxed);
 	}
@@ -985,16 +1063,14 @@ Array mono_array_to_Array(MonoArray *p_array) {
 	return ret;
 }
 
-// TODO: Use memcpy where possible
-
 MonoArray *PackedInt32Array_to_mono_array(const PackedInt32Array &p_array) {
-	const int *r = p_array.ptr();
+	const int32_t *src = p_array.ptr();
+	int length = p_array.size();
 
-	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(int32_t), p_array.size());
+	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(int32_t), length);
 
-	for (int i = 0; i < p_array.size(); i++) {
-		mono_array_set(ret, int32_t, i, r[i]);
-	}
+	int32_t *dst = (int32_t *)mono_array_addr(ret, int32_t, 0);
+	memcpy(dst, src, length);
 
 	return ret;
 }
@@ -1005,23 +1081,48 @@ PackedInt32Array mono_array_to_PackedInt32Array(MonoArray *p_array) {
 		return ret;
 	int length = mono_array_length(p_array);
 	ret.resize(length);
-	int *w = ret.ptrw();
+	int32_t *dst = ret.ptrw();
 
-	for (int i = 0; i < length; i++) {
-		w[i] = mono_array_get(p_array, int32_t, i);
-	}
+	const int32_t *src = (const int32_t *)mono_array_addr(p_array, int32_t, 0);
+	memcpy(dst, src, length);
+
+	return ret;
+}
+
+MonoArray *PackedInt64Array_to_mono_array(const PackedInt64Array &p_array) {
+	const int64_t *src = p_array.ptr();
+	int length = p_array.size();
+
+	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(int64_t), length);
+
+	int64_t *dst = (int64_t *)mono_array_addr(ret, int64_t, 0);
+	memcpy(dst, src, length);
+
+	return ret;
+}
+
+PackedInt64Array mono_array_to_PackedInt64Array(MonoArray *p_array) {
+	PackedInt64Array ret;
+	if (!p_array)
+		return ret;
+	int length = mono_array_length(p_array);
+	ret.resize(length);
+	int64_t *dst = ret.ptrw();
+
+	const int64_t *src = (const int64_t *)mono_array_addr(p_array, int64_t, 0);
+	memcpy(dst, src, length);
 
 	return ret;
 }
 
 MonoArray *PackedByteArray_to_mono_array(const PackedByteArray &p_array) {
-	const uint8_t *r = p_array.ptr();
+	const uint8_t *src = p_array.ptr();
+	int length = p_array.size();
 
-	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(uint8_t), p_array.size());
+	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(uint8_t), length);
 
-	for (int i = 0; i < p_array.size(); i++) {
-		mono_array_set(ret, uint8_t, i, r[i]);
-	}
+	uint8_t *dst = (uint8_t *)mono_array_addr(ret, uint8_t, 0);
+	memcpy(dst, src, length);
 
 	return ret;
 }
@@ -1032,23 +1133,22 @@ PackedByteArray mono_array_to_PackedByteArray(MonoArray *p_array) {
 		return ret;
 	int length = mono_array_length(p_array);
 	ret.resize(length);
-	uint8_t *w = ret.ptrw();
+	uint8_t *dst = ret.ptrw();
 
-	for (int i = 0; i < length; i++) {
-		w[i] = mono_array_get(p_array, uint8_t, i);
-	}
+	const uint8_t *src = (const uint8_t *)mono_array_addr(p_array, uint8_t, 0);
+	memcpy(dst, src, length);
 
 	return ret;
 }
 
 MonoArray *PackedFloat32Array_to_mono_array(const PackedFloat32Array &p_array) {
-	const real_t *r = p_array.ptr();
+	const float *src = p_array.ptr();
+	int length = p_array.size();
 
-	MonoArray *ret = mono_array_new(mono_domain_get(), REAL_T_MONOCLASS, p_array.size());
+	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(float), length);
 
-	for (int i = 0; i < p_array.size(); i++) {
-		mono_array_set(ret, real_t, i, r[i]);
-	}
+	float *dst = (float *)mono_array_addr(ret, float, 0);
+	memcpy(dst, src, length);
 
 	return ret;
 }
@@ -1059,21 +1159,47 @@ PackedFloat32Array mono_array_to_PackedFloat32Array(MonoArray *p_array) {
 		return ret;
 	int length = mono_array_length(p_array);
 	ret.resize(length);
-	real_t *w = ret.ptrw();
+	float *dst = ret.ptrw();
 
-	for (int i = 0; i < length; i++) {
-		w[i] = mono_array_get(p_array, real_t, i);
-	}
+	const float *src = (const float *)mono_array_addr(p_array, float, 0);
+	memcpy(dst, src, length);
+
+	return ret;
+}
+
+MonoArray *PackedFloat64Array_to_mono_array(const PackedFloat64Array &p_array) {
+	const double *src = p_array.ptr();
+	int length = p_array.size();
+
+	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(double), length);
+
+	double *dst = (double *)mono_array_addr(ret, double, 0);
+	memcpy(dst, src, length);
+
+	return ret;
+}
+
+PackedFloat64Array mono_array_to_PackedFloat64Array(MonoArray *p_array) {
+	PackedFloat64Array ret;
+	if (!p_array)
+		return ret;
+	int length = mono_array_length(p_array);
+	ret.resize(length);
+	double *dst = ret.ptrw();
+
+	const double *src = (const double *)mono_array_addr(p_array, double, 0);
+	memcpy(dst, src, length);
 
 	return ret;
 }
 
 MonoArray *PackedStringArray_to_mono_array(const PackedStringArray &p_array) {
 	const String *r = p_array.ptr();
+	int length = p_array.size();
 
-	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(String), p_array.size());
+	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(String), length);
 
-	for (int i = 0; i < p_array.size(); i++) {
+	for (int i = 0; i < length; i++) {
 		MonoString *boxed = mono_string_from_godot(r[i]);
 		mono_array_setref(ret, i, boxed);
 	}
@@ -1098,13 +1224,19 @@ PackedStringArray mono_array_to_PackedStringArray(MonoArray *p_array) {
 }
 
 MonoArray *PackedColorArray_to_mono_array(const PackedColorArray &p_array) {
-	const Color *r = p_array.ptr();
+	const Color *src = p_array.ptr();
+	int length = p_array.size();
 
-	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(Color), p_array.size());
+	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(Color), length);
 
-	for (int i = 0; i < p_array.size(); i++) {
-		M_Color *raw = (M_Color *)mono_array_addr_with_size(ret, sizeof(M_Color), i);
-		*raw = MARSHALLED_OUT(Color, r[i]);
+	if constexpr (InteropLayout::MATCHES_Color) {
+		Color *dst = (Color *)mono_array_addr(ret, Color, 0);
+		memcpy(dst, src, length);
+	} else {
+		for (int i = 0; i < length; i++) {
+			M_Color *raw = (M_Color *)mono_array_addr_with_size(ret, sizeof(M_Color), i);
+			*raw = MARSHALLED_OUT(Color, src[i]);
+		}
 	}
 
 	return ret;
@@ -1116,23 +1248,34 @@ PackedColorArray mono_array_to_PackedColorArray(MonoArray *p_array) {
 		return ret;
 	int length = mono_array_length(p_array);
 	ret.resize(length);
-	Color *w = ret.ptrw();
+	Color *dst = ret.ptrw();
 
-	for (int i = 0; i < length; i++) {
-		w[i] = MARSHALLED_IN(Color, (M_Color *)mono_array_addr_with_size(p_array, sizeof(M_Color), i));
+	if constexpr (InteropLayout::MATCHES_Color) {
+		const Color *src = (const Color *)mono_array_addr(p_array, Color, 0);
+		memcpy(dst, src, length);
+	} else {
+		for (int i = 0; i < length; i++) {
+			dst[i] = MARSHALLED_IN(Color, (M_Color *)mono_array_addr_with_size(p_array, sizeof(M_Color), i));
+		}
 	}
 
 	return ret;
 }
 
 MonoArray *PackedVector2Array_to_mono_array(const PackedVector2Array &p_array) {
-	const Vector2 *r = p_array.ptr();
+	const Vector2 *src = p_array.ptr();
+	int length = p_array.size();
 
-	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(Vector2), p_array.size());
+	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(Vector2), length);
 
-	for (int i = 0; i < p_array.size(); i++) {
-		M_Vector2 *raw = (M_Vector2 *)mono_array_addr_with_size(ret, sizeof(M_Vector2), i);
-		*raw = MARSHALLED_OUT(Vector2, r[i]);
+	if constexpr (InteropLayout::MATCHES_Vector2) {
+		Vector2 *dst = (Vector2 *)mono_array_addr(ret, Vector2, 0);
+		memcpy(dst, src, length);
+	} else {
+		for (int i = 0; i < length; i++) {
+			M_Vector2 *raw = (M_Vector2 *)mono_array_addr_with_size(ret, sizeof(M_Vector2), i);
+			*raw = MARSHALLED_OUT(Vector2, src[i]);
+		}
 	}
 
 	return ret;
@@ -1144,23 +1287,34 @@ PackedVector2Array mono_array_to_PackedVector2Array(MonoArray *p_array) {
 		return ret;
 	int length = mono_array_length(p_array);
 	ret.resize(length);
-	Vector2 *w = ret.ptrw();
+	Vector2 *dst = ret.ptrw();
 
-	for (int i = 0; i < length; i++) {
-		w[i] = MARSHALLED_IN(Vector2, (M_Vector2 *)mono_array_addr_with_size(p_array, sizeof(M_Vector2), i));
+	if constexpr (InteropLayout::MATCHES_Vector2) {
+		const Vector2 *src = (const Vector2 *)mono_array_addr(p_array, Vector2, 0);
+		memcpy(dst, src, length);
+	} else {
+		for (int i = 0; i < length; i++) {
+			dst[i] = MARSHALLED_IN(Vector2, (M_Vector2 *)mono_array_addr_with_size(p_array, sizeof(M_Vector2), i));
+		}
 	}
 
 	return ret;
 }
 
 MonoArray *PackedVector3Array_to_mono_array(const PackedVector3Array &p_array) {
-	const Vector3 *r = p_array.ptr();
+	const Vector3 *src = p_array.ptr();
+	int length = p_array.size();
 
-	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(Vector3), p_array.size());
+	MonoArray *ret = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(Vector3), length);
 
-	for (int i = 0; i < p_array.size(); i++) {
-		M_Vector3 *raw = (M_Vector3 *)mono_array_addr_with_size(ret, sizeof(M_Vector3), i);
-		*raw = MARSHALLED_OUT(Vector3, r[i]);
+	if constexpr (InteropLayout::MATCHES_Vector3) {
+		Vector3 *dst = (Vector3 *)mono_array_addr(ret, Vector3, 0);
+		memcpy(dst, src, length);
+	} else {
+		for (int i = 0; i < length; i++) {
+			M_Vector3 *raw = (M_Vector3 *)mono_array_addr_with_size(ret, sizeof(M_Vector3), i);
+			*raw = MARSHALLED_OUT(Vector3, src[i]);
+		}
 	}
 
 	return ret;
@@ -1172,13 +1326,85 @@ PackedVector3Array mono_array_to_PackedVector3Array(MonoArray *p_array) {
 		return ret;
 	int length = mono_array_length(p_array);
 	ret.resize(length);
-	Vector3 *w = ret.ptrw();
+	Vector3 *dst = ret.ptrw();
 
-	for (int i = 0; i < length; i++) {
-		w[i] = MARSHALLED_IN(Vector3, (M_Vector3 *)mono_array_addr_with_size(p_array, sizeof(M_Vector3), i));
+	if constexpr (InteropLayout::MATCHES_Vector3) {
+		const Vector3 *src = (const Vector3 *)mono_array_addr(p_array, Vector3, 0);
+		memcpy(dst, src, length);
+	} else {
+		for (int i = 0; i < length; i++) {
+			dst[i] = MARSHALLED_IN(Vector3, (M_Vector3 *)mono_array_addr_with_size(p_array, sizeof(M_Vector3), i));
+		}
 	}
 
 	return ret;
 }
 
+Callable managed_to_callable(const M_Callable &p_managed_callable) {
+	if (p_managed_callable.delegate) {
+		// TODO: Use pooling for ManagedCallable instances.
+		CallableCustom *managed_callable = memnew(ManagedCallable(p_managed_callable.delegate));
+		return Callable(managed_callable);
+	} else {
+		Object *target = p_managed_callable.target ?
+								 unbox<Object *>(CACHED_FIELD(GodotObject, ptr)->get_value(p_managed_callable.target)) :
+								 NULL;
+		StringName *method_ptr = unbox<StringName *>(CACHED_FIELD(StringName, ptr)->get_value(p_managed_callable.method_string_name));
+		StringName method = method_ptr ? *method_ptr : StringName();
+		return Callable(target, method);
+	}
+}
+
+M_Callable callable_to_managed(const Callable &p_callable) {
+	if (p_callable.is_custom()) {
+		CallableCustom *custom = p_callable.get_custom();
+		CallableCustom::CompareEqualFunc compare_equal_func = custom->get_compare_equal_func();
+
+		if (compare_equal_func == ManagedCallable::compare_equal_func_ptr) {
+			ManagedCallable *managed_callable = static_cast<ManagedCallable *>(custom);
+			return {
+				NULL, NULL,
+				managed_callable->get_delegate()
+			};
+		} else if (compare_equal_func == SignalAwaiterCallable::compare_equal_func_ptr) {
+			SignalAwaiterCallable *signal_awaiter_callable = static_cast<SignalAwaiterCallable *>(custom);
+			return {
+				GDMonoUtils::unmanaged_get_managed(ObjectDB::get_instance(signal_awaiter_callable->get_object())),
+				GDMonoUtils::create_managed_from(signal_awaiter_callable->get_signal()),
+				NULL
+			};
+		} else if (compare_equal_func == EventSignalCallable::compare_equal_func_ptr) {
+			EventSignalCallable *event_signal_callable = static_cast<EventSignalCallable *>(custom);
+			return {
+				GDMonoUtils::unmanaged_get_managed(ObjectDB::get_instance(event_signal_callable->get_object())),
+				GDMonoUtils::create_managed_from(event_signal_callable->get_signal()),
+				NULL
+			};
+		}
+
+		// Some other CallableCustom. We only support ManagedCallable.
+		return { NULL, NULL, NULL };
+	} else {
+		MonoObject *target_managed = GDMonoUtils::unmanaged_get_managed(p_callable.get_object());
+		MonoObject *method_string_name_managed = GDMonoUtils::create_managed_from(p_callable.get_method());
+		return { target_managed, method_string_name_managed, NULL };
+	}
+}
+
+Signal managed_to_signal_info(const M_SignalInfo &p_managed_signal) {
+	Object *owner = p_managed_signal.owner ?
+							unbox<Object *>(CACHED_FIELD(GodotObject, ptr)->get_value(p_managed_signal.owner)) :
+							NULL;
+	StringName *name_ptr = unbox<StringName *>(CACHED_FIELD(StringName, ptr)->get_value(p_managed_signal.name_string_name));
+	StringName name = name_ptr ? *name_ptr : StringName();
+	return Signal(owner, name);
+}
+
+M_SignalInfo signal_info_to_managed(const Signal &p_signal) {
+	Object *owner = p_signal.get_object();
+	MonoObject *owner_managed = GDMonoUtils::unmanaged_get_managed(owner);
+	MonoObject *name_string_name_managed = GDMonoUtils::create_managed_from(p_signal.get_name());
+	return { owner_managed, name_string_name_managed };
+}
+
 } // namespace GDMonoMarshal