GDScript: Lambda hot reloading

Co-authored-by: Adam Scott <ascott.ca@gmail.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/modules/gdscript/gdscript.h b/modules/gdscript/gdscript.h
index d335ec85ee..04b0a1d786 100644
--- a/modules/gdscript/gdscript.h
+++ b/modules/gdscript/gdscript.h
@@ -86,6 +86,8 @@ class GDScript : public Script {
 	friend class GDScriptAnalyzer;
 	friend class GDScriptCompiler;
 	friend class GDScriptDocGen;
+	friend class GDScriptLambdaCallable;
+	friend class GDScriptLambdaSelfCallable;
 	friend class GDScriptLanguage;
 	friend struct GDScriptUtilityFunctionsDefinitions;
 
@@ -108,6 +110,30 @@ class GDScript : public Script {
 	HashMap<StringName, MethodInfo> _signals;
 	Dictionary rpc_config;
 
+	struct LambdaInfo {
+		int capture_count;
+		bool use_self;
+	};
+
+	HashMap<GDScriptFunction *, LambdaInfo> lambda_info;
+
+	// List is used here because a ptr to elements are stored, so the memory locations need to be stable
+	struct UpdatableFuncPtr {
+		List<GDScriptFunction **> ptrs;
+		Mutex mutex;
+		bool initialized = false;
+	};
+	struct UpdatableFuncPtrElement {
+		List<GDScriptFunction **>::Element *element = nullptr;
+		Mutex *mutex = nullptr;
+	};
+	static thread_local UpdatableFuncPtr func_ptrs_to_update_thread_local;
+	List<UpdatableFuncPtr *> func_ptrs_to_update;
+	Mutex func_ptrs_to_update_mutex;
+
+	UpdatableFuncPtrElement _add_func_ptr_to_update(GDScriptFunction **p_func_ptr_ptr);
+	static void _remove_func_ptr_to_update(const UpdatableFuncPtrElement p_func_ptr_element);
+
 #ifdef TOOLS_ENABLED
 	// For static data storage during hot-reloading.
 	HashMap<StringName, MemberInfo> old_static_variables_indices;