text: /*************************************************************************/
  /*  csharp_script.h                                                      */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
  /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  
  #ifndef CSHARP_SCRIPT_H
  #define CSHARP_SCRIPT_H
  
  #include "core/io/resource_loader.h"
  #include "core/io/resource_saver.h"
  #include "core/script_language.h"
  #include "core/self_list.h"
  
  #include "mono_gc_handle.h"
  #include "mono_gd/gd_mono.h"
  #include "mono_gd/gd_mono_header.h"
  #include "mono_gd/gd_mono_internals.h"
  
  #ifdef TOOLS_ENABLED
  #include "editor/editor_plugin.h"
  #endif
  
  class CSharpScript;
  class CSharpInstance;
  class CSharpLanguage;
  
  #ifdef NO_SAFE_CAST
  template <typename TScriptInstance, typename TScriptLanguage>
  TScriptInstance *cast_script_instance(ScriptInstance *p_inst) {
  	if (!p_inst)
  		return NULL;
  	return p_inst->get_language() == TScriptLanguage::get_singleton() ? static_cast<TScriptInstance *>(p_inst) : NULL;
  }
  #else
  template <typename TScriptInstance, typename TScriptLanguage>
  TScriptInstance *cast_script_instance(ScriptInstance *p_inst) {
  	return dynamic_cast<TScriptInstance *>(p_inst);
  }
  #endif
  
  #define CAST_CSHARP_INSTANCE(m_inst) (cast_script_instance<CSharpInstance, CSharpLanguage>(m_inst))
  
  class CSharpScript : public Script {
  
  	GDCLASS(CSharpScript, Script);
  
  	friend class CSharpInstance;
  	friend class CSharpLanguage;
  	friend struct CSharpScriptDepSort;
  
  	bool tool;
  	bool valid;
  
  	bool builtin;
  
  	GDMonoClass *base;
  	GDMonoClass *native;
  	GDMonoClass *script_class;
  
  	Ref<CSharpScript> base_cache; // TODO what's this for?
  
  	Set<Object *> instances;
  
  #ifdef GD_MONO_HOT_RELOAD
  	struct StateBackup {
  		// TODO
  		// Replace with buffer containing the serialized state of managed scripts.
  		// Keep variant state backup to use only with script instance placeholders.
  		List<Pair<StringName, Variant> > properties;
  	};
  
  	Set<ObjectID> pending_reload_instances;
  	Map<ObjectID, StateBackup> pending_reload_state;
  	StringName tied_class_name_for_reload;
  	StringName tied_class_namespace_for_reload;
  #endif
  
  	String source;
  	StringName name;
  
  	SelfList<CSharpScript> script_list;
  
  	struct Argument {
  		String name;
  		Variant::Type type;
  	};
  
  	Map<StringName, Vector<Argument> > _signals;
  	bool signals_invalidated;
  
  #ifdef TOOLS_ENABLED
  	List<PropertyInfo> exported_members_cache; // members_cache
  	Map<StringName, Variant> exported_members_defval_cache; // member_default_values_cache
  	Set<PlaceHolderScriptInstance *> placeholders;
  	bool source_changed_cache;
  	bool placeholder_fallback_enabled;
  	bool exports_invalidated;
  	void _update_exports_values(Map<StringName, Variant> &values, List<PropertyInfo> &propnames);
  	void _update_member_info_no_exports();
  	virtual void _placeholder_erased(PlaceHolderScriptInstance *p_placeholder);
  #endif
  
  #if defined(TOOLS_ENABLED) || defined(DEBUG_ENABLED)
  	Set<StringName> exported_members_names;
  #endif
  
  	Map<StringName, PropertyInfo> member_info;
  
  	void _clear();
  
  	void load_script_signals(GDMonoClass *p_class, GDMonoClass *p_native_class);
  	bool _get_signal(GDMonoClass *p_class, GDMonoClass *p_delegate, Vector<Argument> &params);
  
  	bool _update_exports();
  	bool _get_member_export(IMonoClassMember *p_member, bool p_inspect_export, PropertyInfo &r_prop_info, bool &r_exported);
  #ifdef TOOLS_ENABLED
  	static int _try_get_member_export_hint(IMonoClassMember *p_member, ManagedType p_type, Variant::Type p_variant_type, bool p_allow_generics, PropertyHint &r_hint, String &r_hint_string);
  #endif
  
  	CSharpInstance *_create_instance(const Variant **p_args, int p_argcount, Object *p_owner, bool p_isref, Variant::CallError &r_error);
  	Variant _new(const Variant **p_args, int p_argcount, Variant::CallError &r_error);
  
  	// Do not use unless you know what you are doing
  	friend void GDMonoInternals::tie_managed_to_unmanaged(MonoObject *, Object *);
  	static Ref<CSharpScript> create_for_managed_type(GDMonoClass *p_class, GDMonoClass *p_native);
  	static void initialize_for_managed_type(Ref<CSharpScript> p_script, GDMonoClass *p_class, GDMonoClass *p_native);
  
  protected:
  	static void _bind_methods();
  
  	Variant call(const StringName &p_method, const Variant **p_args, int p_argcount, Variant::CallError &r_error);
  	virtual void _resource_path_changed();
  	bool _get(const StringName &p_name, Variant &r_ret) const;
  	bool _set(const StringName &p_name, const Variant &p_value);
  	void _get_property_list(List<PropertyInfo> *p_properties) const;
  
  public:
  	virtual bool can_instance() const;
  	virtual StringName get_instance_base_type() const;
  	virtual ScriptInstance *instance_create(Object *p_this);
  	virtual PlaceHolderScriptInstance *placeholder_instance_create(Object *p_this);
  	virtual bool instance_has(const Object *p_this) const;
  
  	virtual bool has_source_code() const;
  	virtual String get_source_code() const;
  	virtual void set_source_code(const String &p_code);
  
  	virtual Error reload(bool p_keep_state = false);
  
  	virtual bool has_script_signal(const StringName &p_signal) const;
  	virtual void get_script_signal_list(List<MethodInfo> *r_signals) const;
  
  	virtual bool get_property_default_value(const StringName &p_property, Variant &r_value) const;
  	virtual void get_script_property_list(List<PropertyInfo> *p_list) const;
  	virtual void update_exports();
  
  	void get_members(Set<StringName> *p_members) override;
  
  	virtual bool is_tool() const { return tool; }
  	virtual bool is_valid() const { return valid; }
  
  	virtual Ref<Script> get_base_script() const;
  	virtual ScriptLanguage *get_language() const;
  
  	virtual void get_script_method_list(List<MethodInfo> *p_list) const;
  	bool has_method(const StringName &p_method) const;
  	MethodInfo get_method_info(const StringName &p_method) const;
  
  	virtual int get_member_line(const StringName &p_member) const;
  
  #ifdef TOOLS_ENABLED
  	virtual bool is_placeholder_fallback_enabled() const { return placeholder_fallback_enabled; }
  #endif
  
  	Error load_source_code(const String &p_path);
  
  	StringName get_script_name() const;
  
  	CSharpScript();
  	~CSharpScript();
  };
  
  class CSharpInstance : public ScriptInstance {
  
  	friend class CSharpScript;
  	friend class CSharpLanguage;
  
  	Object *owner;
  	bool base_ref;
  	bool ref_dying;
  	bool unsafe_referenced;
  	bool predelete_notified;
  	bool destructing_script_instance;
  
  	Ref<CSharpScript> script;
  	Ref<MonoGCHandle> gchandle;
  
  	bool _reference_owner_unsafe();
  
  	/*
  	 * If true is returned, the caller must memdelete the script instance's owner.
  	 */
  	bool _unreference_owner_unsafe();
  
  	/*
  	 * If NULL is returned, the caller must destroy the script instance by removing it from its owner.
  	 */
  	MonoObject *_internal_new_managed();
  
  	// Do not use unless you know what you are doing
  	friend void GDMonoInternals::tie_managed_to_unmanaged(MonoObject *, Object *);
  	static CSharpInstance *create_for_managed_type(Object *p_owner, CSharpScript *p_script, const Ref<MonoGCHandle> &p_gchandle);
  
  	void _call_multilevel(MonoObject *p_mono_object, const StringName &p_method, const Variant **p_args, int p_argcount);
  
  	MultiplayerAPI::RPCMode _member_get_rpc_mode(IMonoClassMember *p_member) const;
  
  	void get_properties_state_for_reloading(List<Pair<StringName, Variant> > &r_state);
  
  public:
  	MonoObject *get_mono_object() const;
  
  	_FORCE_INLINE_ bool is_destructing_script_instance() { return destructing_script_instance; }
  
  	virtual Object *get_owner();
  
  	virtual bool set(const StringName &p_name, const Variant &p_value);
  	virtual bool get(const StringName &p_name, Variant &r_ret) const;
  	virtual void get_property_list(List<PropertyInfo> *p_properties) const;
  	virtual Variant::Type get_property_type(const StringName &p_name, bool *r_is_valid) const;
  
  	/* TODO */ virtual void get_method_list(List<MethodInfo> *p_list) const {}
  	virtual bool has_method(const StringName &p_method) const;
  	virtual Variant call(const StringName &p_method, const Variant **p_args, int p_argcount, Variant::CallError &r_error);
  	virtual void call_multilevel(const StringName &p_method, const Variant **p_args, int p_argcount);
  	virtual void call_multilevel_reversed(const StringName &p_method, const Variant **p_args, int p_argcount);
  
  	void mono_object_disposed(MonoObject *p_obj);
  
  	/*
  	 * If 'r_delete_owner' is set to true, the caller must memdelete the script instance's owner. Otherwise, if
  	 * 'r_remove_script_instance' is set to true, the caller must destroy the script instance by removing it from its owner.
  	 */
  	void mono_object_disposed_baseref(MonoObject *p_obj, bool p_is_finalizer, bool &r_delete_owner, bool &r_remove_script_instance);
  
  	virtual void refcount_incremented();
  	virtual bool refcount_decremented();
  
  	virtual MultiplayerAPI::RPCMode get_rpc_mode(const StringName &p_method) const;
  	virtual MultiplayerAPI::RPCMode get_rset_mode(const StringName &p_variable) const;
  
  	virtual void notification(int p_notification);
  	void _call_notification(int p_notification);
  
  	virtual String to_string(bool *r_valid);
  
  	virtual Ref<Script> get_script() const;
  
  	virtual ScriptLanguage *get_language();
  
  	CSharpInstance();
  	~CSharpInstance();
  };
  
  struct CSharpScriptBinding {
  	bool inited;
  	StringName type_name;
  	GDMonoClass *wrapper_class;
  	Ref<MonoGCHandle> gchandle;
  	Object *owner;
  };
  
  class CSharpLanguage : public ScriptLanguage {
  
  	friend class CSharpScript;
  	friend class CSharpInstance;
  
  	static CSharpLanguage *singleton;
  
  	bool finalizing;
  
  	GDMono *gdmono;
  	SelfList<CSharpScript>::List script_list;
  
  	Mutex *script_instances_mutex;
  	Mutex *script_gchandle_release_mutex;
  	Mutex *language_bind_mutex;
  
  	Map<Object *, CSharpScriptBinding> script_bindings;
  
  #ifdef DEBUG_ENABLED
  	// List of unsafe object references
  	Map<ObjectID, int> unsafe_object_references;
  	Mutex *unsafe_object_references_lock;
  #endif
  
  	struct StringNameCache {
  
  		StringName _signal_callback;
  		StringName _set;
  		StringName _get;
  		StringName _get_property_list;
  		StringName _notification;
  		StringName _script_source;
  		StringName dotctor; // .ctor
  		StringName on_before_serialize; // OnBeforeSerialize
  		StringName on_after_deserialize; // OnAfterDeserialize
  
  		StringNameCache();
  	};
  
  	int lang_idx;
  
  	Dictionary scripts_metadata;
  	bool scripts_metadata_invalidated;
  
  	// For debug_break and debug_break_parse
  	int _debug_parse_err_line;
  	String _debug_parse_err_file;
  	String _debug_error;
  
  	void _load_scripts_metadata();
  
  	friend class GDMono;
  	void _on_scripts_domain_unloaded();
  
  #ifdef TOOLS_ENABLED
  	EditorPlugin *godotsharp_editor;
  
  	static void _editor_init_callback();
  #endif
  
  public:
  	StringNameCache string_names;
  
  	Mutex *get_language_bind_mutex() { return language_bind_mutex; }
  
  	_FORCE_INLINE_ int get_language_index() { return lang_idx; }
  	void set_language_index(int p_idx);
  
  	_FORCE_INLINE_ const StringNameCache &get_string_names() { return string_names; }
  
  	_FORCE_INLINE_ static CSharpLanguage *get_singleton() { return singleton; }
  
  #ifdef TOOLS_ENABLED
  	_FORCE_INLINE_ EditorPlugin *get_godotsharp_editor() const { return godotsharp_editor; }
  #endif
  
  	static void release_script_gchandle(Ref<MonoGCHandle> &p_gchandle);
  	static void release_script_gchandle(MonoObject *p_expected_obj, Ref<MonoGCHandle> &p_gchandle);
  
  	bool debug_break(const String &p_error, bool p_allow_continue = true);
  	bool debug_break_parse(const String &p_file, int p_line, const String &p_error);
  
  #ifdef GD_MONO_HOT_RELOAD
  	bool is_assembly_reloading_needed();
  	void reload_assemblies(bool p_soft_reload);
  #endif
  
  	_FORCE_INLINE_ Dictionary get_scripts_metadata_or_nothing() {
  		return scripts_metadata_invalidated ? Dictionary() : scripts_metadata;
  	}
  
  	_FORCE_INLINE_ const Dictionary &get_scripts_metadata() {
  		if (scripts_metadata_invalidated)
  			_load_scripts_metadata();
  		return scripts_metadata;
  	}
  
  	virtual String get_name() const;
  
  	/* LANGUAGE FUNCTIONS */
  	virtual String get_type() const;
  	virtual String get_extension() const;
  	virtual Error execute_file(const String &p_path);
  	virtual void init();
  	virtual void finish();
  
  	/* EDITOR FUNCTIONS */
  	virtual void get_reserved_words(List<String> *p_words) const;
  	virtual void get_comment_delimiters(List<String> *p_delimiters) const;
  	virtual void get_string_delimiters(List<String> *p_delimiters) const;
  	virtual Ref<Script> get_template(const String &p_class_name, const String &p_base_class_name) const;
  	virtual bool is_using_templates();
  	virtual void make_template(const String &p_class_name, const String &p_base_class_name, Ref<Script> &p_script);
  	/* TODO */ virtual bool validate(const String &p_script, int &r_line_error, int &r_col_error, String &r_test_error, const String &p_path, List<String> *r_functions, List<ScriptLanguage::Warning> *r_warnings = NULL, Set<int> *r_safe_lines = NULL) const { return true; }
  	virtual String validate_path(const String &p_path) const;
  	virtual Script *create_script() const;
  	virtual bool has_named_classes() const;
  	virtual bool supports_builtin_mode() const;
  	/* TODO? */ virtual int find_function(const String &p_function, const String &p_code) const { return -1; }
  	virtual String make_function(const String &p_class, const String &p_name, const PoolStringArray &p_args) const;
  	virtual String _get_indentation() const;
  	/* TODO? */ virtual void auto_indent_code(String &p_code, int p_from_line, int p_to_line) const {}
  	/* TODO */ virtual void add_global_constant(const StringName &p_variable, const Variant &p_value) {}
  
  	/* DEBUGGER FUNCTIONS */
  	virtual String debug_get_error() const;
  	virtual int debug_get_stack_level_count() const;
  	virtual int debug_get_stack_level_line(int p_level) const;
  	virtual String debug_get_stack_level_function(int p_level) const;
  	virtual String debug_get_stack_level_source(int p_level) const;
  	/* TODO */ virtual void debug_get_stack_level_locals(int p_level, List<String> *p_locals, List<Variant> *p_values, int p_max_subitems, int p_max_depth) {}
  	/* TODO */ virtual void debug_get_stack_level_members(int p_level, List<String> *p_members, List<Variant> *p_values, int p_max_subitems, int p_max_depth) {}
  	/* TODO */ virtual void debug_get_globals(List<String> *p_locals, List<Variant> *p_values, int p_max_subitems, int p_max_depth) {}
  	/* TODO */ virtual String debug_parse_stack_level_expression(int p_level, const String &p_expression, int p_max_subitems, int p_max_depth) { return ""; }
  	virtual Vector<StackInfo> debug_get_current_stack_info();
  
  	/* PROFILING FUNCTIONS */
  	/* TODO */ virtual void profiling_start() {}
  	/* TODO */ virtual void profiling_stop() {}
  	/* TODO */ virtual int profiling_get_accumulated_data(ProfilingInfo *p_info_arr, int p_info_max) { return 0; }
  	/* TODO */ virtual int profiling_get_frame_data(ProfilingInfo *p_info_arr, int p_info_max) { return 0; }
  
  	virtual void frame();
  
  	/* TODO? */ virtual void get_public_functions(List<MethodInfo> *p_functions) const {}
  	/* TODO? */ virtual void get_public_constants(List<Pair<String, Variant> > *p_constants) const {}
  
  	virtual void reload_all_scripts();
  	virtual void reload_tool_script(const Ref<Script> &p_script, bool p_soft_reload);
  
  	/* LOADER FUNCTIONS */
  	virtual void get_recognized_extensions(List<String> *p_extensions) const;
  
  #ifdef TOOLS_ENABLED
  	virtual Error open_in_external_editor(const Ref<Script> &p_script, int p_line, int p_col);
  	virtual bool overrides_external_editor();
  #endif
  
  	/* THREAD ATTACHING */
  	virtual void thread_enter();
  	virtual void thread_exit();
  
  	// 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);
  
  	Map<Object *, CSharpScriptBinding>::Element *insert_script_binding(Object *p_object, const CSharpScriptBinding &p_script_binding);
  	bool setup_csharp_script_binding(CSharpScriptBinding &r_script_binding, Object *p_object);
  
  #ifdef DEBUG_ENABLED
  	Vector<StackInfo> stack_trace_get_info(MonoObject *p_stack_trace);
  #endif
  
  	void post_unsafe_reference(Object *p_obj);
  	void pre_unsafe_unreference(Object *p_obj);
  
  	CSharpLanguage();
  	~CSharpLanguage();
  };
  
  class ResourceFormatLoaderCSharpScript : public ResourceFormatLoader {
  public:
  	virtual RES load(const String &p_path, const String &p_original_path = "", Error *r_error = NULL);
  	virtual void get_recognized_extensions(List<String> *p_extensions) const;
  	virtual bool handles_type(const String &p_type) const;
  	virtual String get_resource_type(const String &p_path) const;
  };
  
  class ResourceFormatSaverCSharpScript : public ResourceFormatSaver {
  public:
  	virtual Error save(const String &p_path, const RES &p_resource, uint32_t p_flags = 0);
  	virtual void get_recognized_extensions(const RES &p_resource, List<String> *p_extensions) const;
  	virtual bool recognize(const RES &p_resource) const;
  };
  
  #endif // CSHARP_SCRIPT_H
  