Merge pull request #50454 from Ev1lbl0w/gsoc21-dap

Implemented initial DAP support

18 files changed, 1666 insertions, 18 deletions

diff --git a/core/debugger/remote_debugger.cpp b/core/debugger/remote_debugger.cpp
index 0add12ff3d..62d5126e57 100644
--- a/core/debugger/remote_debugger.cpp
+++ b/core/debugger/remote_debugger.cpp
@@ -706,6 +706,8 @@ void RemoteDebugger::debug(bool p_can_continue, bool p_is_error_breakpoint) {
 	Array msg;
 	msg.push_back(p_can_continue);
 	msg.push_back(error_str);
+	ERR_FAIL_COND(!script_lang);
+	msg.push_back(script_lang->debug_get_stack_level_count() > 0);
 	send_message("debug_enter", msg);
 
 	servers_profiler->skip_profile_frame = true; // Avoid frame time spike in debug.
@@ -754,7 +756,6 @@ void RemoteDebugger::debug(bool p_can_continue, bool p_is_error_breakpoint) {
 				break;
 
 			} else if (command == "get_stack_dump") {
-				ERR_FAIL_COND(!script_lang);
 				DebuggerMarshalls::ScriptStackDump dump;
 				int slc = script_lang->debug_get_stack_level_count();
 				for (int i = 0; i < slc; i++) {
@@ -790,7 +791,9 @@ void RemoteDebugger::debug(bool p_can_continue, bool p_is_error_breakpoint) {
 				script_lang->debug_get_globals(&globals, &globals_vals);
 				ERR_FAIL_COND(globals.size() != globals_vals.size());
 
-				send_message("stack_frame_vars", Array());
+				Array var_size;
+				var_size.push_back(local_vals.size() + member_vals.size() + globals_vals.size());
+				send_message("stack_frame_vars", var_size);
 				_send_stack_vars(locals, local_vals, 0);
 				_send_stack_vars(members, member_vals, 1);
 				_send_stack_vars(globals, globals_vals, 2);
diff --git a/editor/debugger/SCsub b/editor/debugger/SCsub
index 359d04e5df..99f1c888f0 100644
--- a/editor/debugger/SCsub
+++ b/editor/debugger/SCsub
@@ -3,3 +3,5 @@
 Import("env")
 
 env.add_source_files(env.editor_sources, "*.cpp")
+
+SConscript("debug_adapter/SCsub")
diff --git a/editor/debugger/debug_adapter/SCsub b/editor/debugger/debug_adapter/SCsub
new file mode 100644
index 0000000000..359d04e5df
--- /dev/null
+++ b/editor/debugger/debug_adapter/SCsub
@@ -0,0 +1,5 @@
+#!/usr/bin/env python
+
+Import("env")
+
+env.add_source_files(env.editor_sources, "*.cpp")
diff --git a/editor/debugger/debug_adapter/debug_adapter_parser.cpp b/editor/debugger/debug_adapter/debug_adapter_parser.cpp
new file mode 100644
index 0000000000..945291b163
--- /dev/null
+++ b/editor/debugger/debug_adapter/debug_adapter_parser.cpp
@@ -0,0 +1,425 @@
+/*************************************************************************/
+/*  debug_adapter_parser.cpp                                             */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 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.                */
+/*************************************************************************/
+
+#include "debug_adapter_parser.h"
+
+#include "editor/debugger/editor_debugger_node.h"
+#include "editor/debugger/script_editor_debugger.h"
+#include "editor/editor_node.h"
+
+void DebugAdapterParser::_bind_methods() {
+	// Requests
+	ClassDB::bind_method(D_METHOD("req_initialize", "params"), &DebugAdapterParser::req_initialize);
+	ClassDB::bind_method(D_METHOD("req_disconnect", "params"), &DebugAdapterParser::prepare_success_response);
+	ClassDB::bind_method(D_METHOD("req_launch", "params"), &DebugAdapterParser::req_launch);
+	ClassDB::bind_method(D_METHOD("req_terminate", "params"), &DebugAdapterParser::req_terminate);
+	ClassDB::bind_method(D_METHOD("req_configurationDone", "params"), &DebugAdapterParser::prepare_success_response);
+	ClassDB::bind_method(D_METHOD("req_pause", "params"), &DebugAdapterParser::req_pause);
+	ClassDB::bind_method(D_METHOD("req_continue", "params"), &DebugAdapterParser::req_continue);
+	ClassDB::bind_method(D_METHOD("req_threads", "params"), &DebugAdapterParser::req_threads);
+	ClassDB::bind_method(D_METHOD("req_stackTrace", "params"), &DebugAdapterParser::req_stackTrace);
+	ClassDB::bind_method(D_METHOD("req_setBreakpoints", "params"), &DebugAdapterParser::req_setBreakpoints);
+	ClassDB::bind_method(D_METHOD("req_scopes", "params"), &DebugAdapterParser::req_scopes);
+	ClassDB::bind_method(D_METHOD("req_variables", "params"), &DebugAdapterParser::req_variables);
+	ClassDB::bind_method(D_METHOD("req_next", "params"), &DebugAdapterParser::req_next);
+	ClassDB::bind_method(D_METHOD("req_stepIn", "params"), &DebugAdapterParser::req_stepIn);
+}
+
+Dictionary DebugAdapterParser::prepare_base_event() const {
+	Dictionary event;
+	event["type"] = "event";
+
+	return event;
+}
+
+Dictionary DebugAdapterParser::prepare_success_response(const Dictionary &p_params) const {
+	Dictionary response;
+	response["type"] = "response";
+	response["request_seq"] = p_params["seq"];
+	response["command"] = p_params["command"];
+	response["success"] = true;
+
+	return response;
+}
+
+Dictionary DebugAdapterParser::prepare_error_response(const Dictionary &p_params, DAP::ErrorType err_type, const Dictionary &variables) const {
+	Dictionary response, body;
+	response["type"] = "response";
+	response["request_seq"] = p_params["seq"];
+	response["command"] = p_params["command"];
+	response["success"] = false;
+	response["body"] = body;
+
+	DAP::Message message;
+	String error, error_desc;
+	switch (err_type) {
+		case DAP::ErrorType::UNKNOWN:
+			error = "unknown";
+			error_desc = "An unknown error has ocurred when processing the request.";
+			break;
+		case DAP::ErrorType::WRONG_PATH:
+			error = "wrong_path";
+			error_desc = "The editor and client are working on different paths; the client is on \"{clientPath}\", but the editor is on \"{editorPath}\"";
+	}
+
+	message.id = err_type;
+	message.format = error_desc;
+	message.variables = variables;
+	response["message"] = error;
+	body["error"] = message.to_json();
+
+	return response;
+}
+
+Dictionary DebugAdapterParser::req_initialize(const Dictionary &p_params) const {
+	Dictionary response = prepare_success_response(p_params);
+	Dictionary args = p_params["arguments"];
+
+	Ref<DAPeer> peer = DebugAdapterProtocol::get_singleton()->get_current_peer();
+
+	peer->linesStartAt1 = args.get("linesStartAt1", false);
+	peer->columnsStartAt1 = args.get("columnsStartAt1", false);
+	peer->supportsVariableType = args.get("supportsVariableType", false);
+	peer->supportsInvalidatedEvent = args.get("supportsInvalidatedEvent", false);
+
+	DAP::Capabilities caps;
+	response["body"] = caps.to_json();
+
+	DebugAdapterProtocol::get_singleton()->notify_initialized();
+
+	return response;
+}
+
+Dictionary DebugAdapterParser::req_launch(const Dictionary &p_params) {
+	Dictionary args = p_params["arguments"];
+	if (args.has("project") && !is_valid_path(args["project"])) {
+		Dictionary variables;
+		variables["clientPath"] = args["project"];
+		variables["editorPath"] = ProjectSettings::get_singleton()->get_resource_path();
+		return prepare_error_response(p_params, DAP::ErrorType::WRONG_PATH, variables);
+	}
+
+	ScriptEditorDebugger *dbg = EditorDebuggerNode::get_singleton()->get_default_debugger();
+	if ((bool)args["noDebug"] != dbg->is_skip_breakpoints()) {
+		dbg->debug_skip_breakpoints();
+	}
+
+	EditorNode::get_singleton()->run_play();
+	DebugAdapterProtocol::get_singleton()->notify_process();
+
+	return prepare_success_response(p_params);
+}
+
+Dictionary DebugAdapterParser::req_terminate(const Dictionary &p_params) const {
+	EditorNode::get_singleton()->run_stop();
+
+	return prepare_success_response(p_params);
+}
+
+Dictionary DebugAdapterParser::req_pause(const Dictionary &p_params) const {
+	EditorNode::get_singleton()->get_pause_button()->set_pressed(true);
+	EditorDebuggerNode::get_singleton()->_paused();
+
+	DebugAdapterProtocol::get_singleton()->notify_stopped_paused();
+
+	return prepare_success_response(p_params);
+}
+
+Dictionary DebugAdapterParser::req_continue(const Dictionary &p_params) const {
+	EditorNode::get_singleton()->get_pause_button()->set_pressed(false);
+	EditorDebuggerNode::get_singleton()->_paused();
+
+	DebugAdapterProtocol::get_singleton()->notify_continued();
+
+	return prepare_success_response(p_params);
+}
+
+Dictionary DebugAdapterParser::req_threads(const Dictionary &p_params) const {
+	Dictionary response = prepare_success_response(p_params), body;
+	response["body"] = body;
+
+	Array arr;
+	DAP::Thread thread;
+
+	thread.id = 1; // Hardcoded because Godot only supports debugging one thread at the moment
+	thread.name = "Main";
+	arr.push_back(thread.to_json());
+	body["threads"] = arr;
+
+	return response;
+}
+
+Dictionary DebugAdapterParser::req_stackTrace(const Dictionary &p_params) const {
+	if (DebugAdapterProtocol::get_singleton()->_processing_stackdump) {
+		return Dictionary();
+	}
+
+	Dictionary response = prepare_success_response(p_params), body;
+	response["body"] = body;
+
+	bool lines_at_one = DebugAdapterProtocol::get_singleton()->get_current_peer()->linesStartAt1;
+	bool columns_at_one = DebugAdapterProtocol::get_singleton()->get_current_peer()->columnsStartAt1;
+
+	Array arr;
+	DebugAdapterProtocol *dap = DebugAdapterProtocol::get_singleton();
+	for (Map<DAP::StackFrame, List<int>>::Element *E = dap->stackframe_list.front(); E; E = E->next()) {
+		DAP::StackFrame sf = E->key();
+		if (!lines_at_one) {
+			sf.line--;
+		}
+		if (!columns_at_one) {
+			sf.column--;
+		}
+
+		arr.push_back(sf.to_json());
+	}
+
+	body["stackFrames"] = arr;
+	return response;
+}
+
+Dictionary DebugAdapterParser::req_setBreakpoints(const Dictionary &p_params) {
+	Dictionary response = prepare_success_response(p_params), body;
+	response["body"] = body;
+
+	Dictionary args = p_params["arguments"];
+	DAP::Source source;
+	source.from_json(args["source"]);
+
+	bool lines_at_one = DebugAdapterProtocol::get_singleton()->get_current_peer()->linesStartAt1;
+
+	if (!is_valid_path(source.path)) {
+		Dictionary variables;
+		variables["clientPath"] = source.path;
+		variables["editorPath"] = ProjectSettings::get_singleton()->get_resource_path();
+		return prepare_error_response(p_params, DAP::ErrorType::WRONG_PATH, variables);
+	}
+
+	Array breakpoints = args["breakpoints"], lines;
+	for (int i = 0; i < breakpoints.size(); i++) {
+		DAP::SourceBreakpoint breakpoint;
+		breakpoint.from_json(breakpoints[i]);
+
+		lines.push_back(breakpoint.line + !lines_at_one);
+	}
+
+	EditorDebuggerNode::get_singleton()->set_breakpoints(ProjectSettings::get_singleton()->localize_path(source.path), lines);
+	Array updated_breakpoints = DebugAdapterProtocol::get_singleton()->update_breakpoints(source.path, lines);
+	body["breakpoints"] = updated_breakpoints;
+
+	return response;
+}
+
+Dictionary DebugAdapterParser::req_scopes(const Dictionary &p_params) {
+	Dictionary response = prepare_success_response(p_params), body;
+	response["body"] = body;
+
+	Dictionary args = p_params["arguments"];
+	int frame_id = args["frameId"];
+	Array scope_list;
+
+	DAP::StackFrame frame;
+	frame.id = frame_id;
+	Map<DAP::StackFrame, List<int>>::Element *E = DebugAdapterProtocol::get_singleton()->stackframe_list.find(frame);
+	if (E) {
+		ERR_FAIL_COND_V(E->value().size() != 3, prepare_error_response(p_params, DAP::ErrorType::UNKNOWN));
+		for (int i = 0; i < 3; i++) {
+			DAP::Scope scope;
+			scope.variablesReference = E->value()[i];
+			switch (i) {
+				case 0:
+					scope.name = "Locals";
+					scope.presentationHint = "locals";
+					break;
+				case 1:
+					scope.name = "Members";
+					scope.presentationHint = "members";
+					break;
+				case 2:
+					scope.name = "Globals";
+					scope.presentationHint = "globals";
+			}
+
+			scope_list.push_back(scope.to_json());
+		}
+	}
+
+	EditorDebuggerNode::get_singleton()->get_default_debugger()->request_stack_dump(frame_id);
+	DebugAdapterProtocol::get_singleton()->_current_frame = frame_id;
+
+	body["scopes"] = scope_list;
+	return response;
+}
+
+Dictionary DebugAdapterParser::req_variables(const Dictionary &p_params) const {
+	// If _remaining_vars > 0, the debugee is still sending a stack dump to the editor.
+	if (DebugAdapterProtocol::get_singleton()->_remaining_vars > 0) {
+		return Dictionary();
+	}
+
+	Dictionary response = prepare_success_response(p_params), body;
+	response["body"] = body;
+
+	Dictionary args = p_params["arguments"];
+	int variable_id = args["variablesReference"];
+
+	Map<int, Array>::Element *E = DebugAdapterProtocol::get_singleton()->variable_list.find(variable_id);
+	if (E) {
+		body["variables"] = E ? E->value() : Array();
+		return response;
+	} else {
+		return Dictionary();
+	}
+}
+
+Dictionary DebugAdapterParser::req_next(const Dictionary &p_params) const {
+	EditorDebuggerNode::get_singleton()->get_default_debugger()->debug_next();
+	DebugAdapterProtocol::get_singleton()->_stepping = true;
+
+	return prepare_success_response(p_params);
+}
+
+Dictionary DebugAdapterParser::req_stepIn(const Dictionary &p_params) const {
+	EditorDebuggerNode::get_singleton()->get_default_debugger()->debug_step();
+	DebugAdapterProtocol::get_singleton()->_stepping = true;
+
+	return prepare_success_response(p_params);
+}
+
+Dictionary DebugAdapterParser::ev_initialized() const {
+	Dictionary event = prepare_base_event();
+	event["event"] = "initialized";
+
+	return event;
+}
+
+Dictionary DebugAdapterParser::ev_process(const String &p_command) const {
+	Dictionary event = prepare_base_event(), body;
+	event["event"] = "process";
+	event["body"] = body;
+
+	body["name"] = OS::get_singleton()->get_executable_path();
+	body["startMethod"] = p_command;
+
+	return event;
+}
+
+Dictionary DebugAdapterParser::ev_terminated() const {
+	Dictionary event = prepare_base_event();
+	event["event"] = "terminated";
+
+	return event;
+}
+
+Dictionary DebugAdapterParser::ev_exited(const int &p_exitcode) const {
+	Dictionary event = prepare_base_event(), body;
+	event["event"] = "exited";
+	event["body"] = body;
+
+	body["exitCode"] = p_exitcode;
+
+	return event;
+}
+
+Dictionary DebugAdapterParser::ev_stopped() const {
+	Dictionary event = prepare_base_event(), body;
+	event["event"] = "stopped";
+	event["body"] = body;
+
+	body["threadId"] = 1;
+
+	return event;
+}
+
+Dictionary DebugAdapterParser::ev_stopped_paused() const {
+	Dictionary event = ev_stopped();
+	Dictionary body = event["body"];
+
+	body["reason"] = "paused";
+	body["description"] = "Paused";
+
+	return event;
+}
+
+Dictionary DebugAdapterParser::ev_stopped_exception(const String &p_error) const {
+	Dictionary event = ev_stopped();
+	Dictionary body = event["body"];
+
+	body["reason"] = "exception";
+	body["description"] = "Exception";
+	body["text"] = p_error;
+
+	return event;
+}
+
+Dictionary DebugAdapterParser::ev_stopped_breakpoint(const int &p_id) const {
+	Dictionary event = ev_stopped();
+	Dictionary body = event["body"];
+
+	body["reason"] = "breakpoint";
+	body["description"] = "Breakpoint";
+
+	Array breakpoints;
+	breakpoints.push_back(p_id);
+	body["hitBreakpointIds"] = breakpoints;
+
+	return event;
+}
+
+Dictionary DebugAdapterParser::ev_stopped_step() const {
+	Dictionary event = ev_stopped();
+	Dictionary body = event["body"];
+
+	body["reason"] = "step";
+	body["description"] = "Breakpoint";
+
+	return event;
+}
+
+Dictionary DebugAdapterParser::ev_continued() const {
+	Dictionary event = prepare_base_event(), body;
+	event["event"] = "continued";
+	event["body"] = body;
+
+	body["threadId"] = 1;
+
+	return event;
+}
+
+Dictionary DebugAdapterParser::ev_output(const String &p_message) const {
+	Dictionary event = prepare_base_event(), body;
+	event["event"] = "output";
+	event["body"] = body;
+
+	body["category"] = "stdout";
+	body["output"] = p_message + "\r\n";
+
+	return event;
+}
diff --git a/editor/debugger/debug_adapter/debug_adapter_parser.h b/editor/debugger/debug_adapter/debug_adapter_parser.h
new file mode 100644
index 0000000000..b86b37d067
--- /dev/null
+++ b/editor/debugger/debug_adapter/debug_adapter_parser.h
@@ -0,0 +1,88 @@
+/*************************************************************************/
+/*  debug_adapter_parser.h                                               */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 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 DEBUG_ADAPTER_PARSER_H
+#define DEBUG_ADAPTER_PARSER_H
+
+#include "core/config/project_settings.h"
+#include "debug_adapter_protocol.h"
+#include "debug_adapter_types.h"
+
+struct DAPeer;
+class DebugAdapterProtocol;
+
+class DebugAdapterParser : public Object {
+	GDCLASS(DebugAdapterParser, Object);
+
+private:
+	friend DebugAdapterProtocol;
+
+	_FORCE_INLINE_ bool is_valid_path(const String &p_path) {
+		return p_path.begins_with(ProjectSettings::get_singleton()->get_resource_path());
+	}
+
+protected:
+	static void _bind_methods();
+
+	Dictionary prepare_base_event() const;
+	Dictionary prepare_success_response(const Dictionary &p_params) const;
+	Dictionary prepare_error_response(const Dictionary &p_params, DAP::ErrorType err_type, const Dictionary &variables = Dictionary()) const;
+
+	Dictionary ev_stopped() const;
+
+public:
+	// Requests
+	Dictionary req_initialize(const Dictionary &p_params) const;
+	Dictionary req_launch(const Dictionary &p_params);
+	Dictionary req_terminate(const Dictionary &p_params) const;
+	Dictionary req_pause(const Dictionary &p_params) const;
+	Dictionary req_continue(const Dictionary &p_params) const;
+	Dictionary req_threads(const Dictionary &p_params) const;
+	Dictionary req_stackTrace(const Dictionary &p_params) const;
+	Dictionary req_setBreakpoints(const Dictionary &p_params);
+	Dictionary req_scopes(const Dictionary &p_params);
+	Dictionary req_variables(const Dictionary &p_params) const;
+	Dictionary req_next(const Dictionary &p_params) const;
+	Dictionary req_stepIn(const Dictionary &p_params) const;
+
+	// Events
+	Dictionary ev_initialized() const;
+	Dictionary ev_process(const String &p_command) const;
+	Dictionary ev_terminated() const;
+	Dictionary ev_exited(const int &p_exitcode) const;
+	Dictionary ev_stopped_paused() const;
+	Dictionary ev_stopped_exception(const String &p_error) const;
+	Dictionary ev_stopped_breakpoint(const int &p_id) const;
+	Dictionary ev_stopped_step() const;
+	Dictionary ev_continued() const;
+	Dictionary ev_output(const String &p_message) const;
+};
+
+#endif
diff --git a/editor/debugger/debug_adapter/debug_adapter_protocol.cpp b/editor/debugger/debug_adapter/debug_adapter_protocol.cpp
new file mode 100644
index 0000000000..0482271432
--- /dev/null
+++ b/editor/debugger/debug_adapter/debug_adapter_protocol.cpp
@@ -0,0 +1,497 @@
+/*************************************************************************/
+/*  debug_adapter_protocol.cpp                                           */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 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.                */
+/*************************************************************************/
+
+#include "debug_adapter_protocol.h"
+
+#include "core/config/project_settings.h"
+#include "core/debugger/debugger_marshalls.h"
+#include "core/io/json.h"
+#include "editor/debugger/script_editor_debugger.h"
+#include "editor/doc_tools.h"
+#include "editor/editor_log.h"
+#include "editor/editor_node.h"
+
+DebugAdapterProtocol *DebugAdapterProtocol::singleton = nullptr;
+
+Error DAPeer::handle_data() {
+	int read = 0;
+	// Read headers
+	if (!has_header) {
+		if (!connection->get_available_bytes()) {
+			return OK;
+		}
+		while (true) {
+			if (req_pos >= DAP_MAX_BUFFER_SIZE) {
+				req_pos = 0;
+				ERR_FAIL_COND_V_MSG(true, ERR_OUT_OF_MEMORY, "Response header too big");
+			}
+			Error err = connection->get_partial_data(&req_buf[req_pos], 1, read);
+			if (err != OK) {
+				return FAILED;
+			} else if (read != 1) { // Busy, wait until next poll
+				return ERR_BUSY;
+			}
+			char *r = (char *)req_buf;
+			int l = req_pos;
+
+			// End of headers
+			if (l > 3 && r[l] == '\n' && r[l - 1] == '\r' && r[l - 2] == '\n' && r[l - 3] == '\r') {
+				r[l - 3] = '\0'; // Null terminate to read string
+				String header;
+				header.parse_utf8(r);
+				content_length = header.substr(16).to_int();
+				has_header = true;
+				req_pos = 0;
+				break;
+			}
+			req_pos++;
+		}
+	}
+	if (has_header) {
+		while (req_pos < content_length) {
+			if (content_length >= DAP_MAX_BUFFER_SIZE) {
+				req_pos = 0;
+				has_header = false;
+				ERR_FAIL_COND_V_MSG(req_pos >= DAP_MAX_BUFFER_SIZE, ERR_OUT_OF_MEMORY, "Response content too big");
+			}
+			Error err = connection->get_partial_data(&req_buf[req_pos], content_length - req_pos, read);
+			if (err != OK) {
+				return FAILED;
+			} else if (read < content_length - req_pos) {
+				return ERR_BUSY;
+			}
+			req_pos += read;
+		}
+
+		// Parse data
+		String msg;
+		msg.parse_utf8((const char *)req_buf, req_pos);
+
+		// Response
+		if (DebugAdapterProtocol::get_singleton()->process_message(msg)) {
+			// Reset to read again
+			req_pos = 0;
+			has_header = false;
+		}
+	}
+	return OK;
+}
+
+Error DAPeer::send_data() {
+	while (res_queue.size()) {
+		Dictionary data = res_queue.front()->get();
+		if (!data.has("seq")) {
+			data["seq"] = ++seq;
+		}
+		String formatted_data = format_output(data);
+
+		int data_sent = 0;
+		while (data_sent < formatted_data.length()) {
+			int curr_sent = 0;
+			Error err = connection->put_partial_data((const uint8_t *)formatted_data.utf8().get_data(), formatted_data.size() - data_sent - 1, curr_sent);
+			if (err != OK) {
+				return err;
+			}
+			data_sent += curr_sent;
+		}
+		res_queue.pop_front();
+	}
+	return OK;
+}
+
+String DAPeer::format_output(const Dictionary &p_params) const {
+	String response = Variant(p_params).to_json_string();
+	String header = "Content-Length: ";
+	CharString charstr = response.utf8();
+	size_t len = charstr.length();
+	header += itos(len);
+	header += "\r\n\r\n";
+
+	return header + response;
+}
+
+Error DebugAdapterProtocol::on_client_connected() {
+	ERR_FAIL_COND_V_MSG(clients.size() >= DAP_MAX_CLIENTS, FAILED, "Max client limits reached");
+
+	Ref<StreamPeerTCP> tcp_peer = server->take_connection();
+	tcp_peer->set_no_delay(true);
+	Ref<DAPeer> peer = memnew(DAPeer);
+	peer->connection = tcp_peer;
+	clients.push_back(peer);
+
+	EditorDebuggerNode::get_singleton()->get_default_debugger()->set_move_to_foreground(false);
+	EditorNode::get_log()->add_message("[DAP] Connection Taken", EditorLog::MSG_TYPE_EDITOR);
+	return OK;
+}
+
+void DebugAdapterProtocol::on_client_disconnected(const Ref<DAPeer> &p_peer) {
+	clients.erase(p_peer);
+	if (!clients.size()) {
+		reset_ids();
+		EditorDebuggerNode::get_singleton()->get_default_debugger()->set_move_to_foreground(true);
+	}
+	EditorNode::get_log()->add_message("[DAP] Disconnected", EditorLog::MSG_TYPE_EDITOR);
+}
+
+void DebugAdapterProtocol::reset_current_info() {
+	_current_request = "";
+	_current_peer.unref();
+}
+
+void DebugAdapterProtocol::reset_ids() {
+	breakpoint_id = 0;
+	breakpoint_list.clear();
+
+	reset_stack_info();
+}
+
+void DebugAdapterProtocol::reset_stack_info() {
+	stackframe_id = 0;
+	variable_id = 1;
+
+	stackframe_list.clear();
+	variable_list.clear();
+}
+
+bool DebugAdapterProtocol::process_message(const String &p_text) {
+	JSON json;
+	ERR_FAIL_COND_V_MSG(json.parse(p_text) != OK, true, "Mal-formed message!");
+	Dictionary params = json.get_data();
+	bool completed = true;
+
+	// Append "req_" to any command received; prevents name clash with existing functions, and possibly exploiting
+	String command = "req_" + (String)params["command"];
+	if (parser->has_method(command)) {
+		_current_request = params["command"];
+
+		Array args;
+		args.push_back(params);
+		Dictionary response = parser->callv(command, args);
+		if (!response.is_empty()) {
+			_current_peer->res_queue.push_front(response);
+		} else {
+			completed = false;
+		}
+	}
+
+	reset_current_info();
+	return completed;
+}
+
+void DebugAdapterProtocol::notify_initialized() {
+	Dictionary event = parser->ev_initialized();
+	_current_peer->res_queue.push_back(event);
+}
+
+void DebugAdapterProtocol::notify_process() {
+	String launch_mode = _current_request.is_empty() ? "launch" : _current_request;
+
+	Dictionary event = parser->ev_process(launch_mode);
+	for (List<Ref<DAPeer>>::Element *E = clients.front(); E; E = E->next()) {
+		E->get()->res_queue.push_back(event);
+	}
+}
+
+void DebugAdapterProtocol::notify_terminated() {
+	Dictionary event = parser->ev_terminated();
+	for (List<Ref<DAPeer>>::Element *E = clients.front(); E; E = E->next()) {
+		if (_current_request == "launch" && _current_peer == E->get()) {
+			continue;
+		}
+		E->get()->res_queue.push_back(event);
+	}
+}
+
+void DebugAdapterProtocol::notify_exited(const int &p_exitcode) {
+	Dictionary event = parser->ev_exited(p_exitcode);
+	for (List<Ref<DAPeer>>::Element *E = clients.front(); E; E = E->next()) {
+		if (_current_request == "launch" && _current_peer == E->get()) {
+			continue;
+		}
+		E->get()->res_queue.push_back(event);
+	}
+}
+
+void DebugAdapterProtocol::notify_stopped_paused() {
+	Dictionary event = parser->ev_stopped_paused();
+	for (List<Ref<DAPeer>>::Element *E = clients.front(); E; E = E->next()) {
+		E->get()->res_queue.push_back(event);
+	}
+}
+
+void DebugAdapterProtocol::notify_stopped_exception(const String &p_error) {
+	Dictionary event = parser->ev_stopped_exception(p_error);
+	for (List<Ref<DAPeer>>::Element *E = clients.front(); E; E = E->next()) {
+		E->get()->res_queue.push_back(event);
+	}
+}
+
+void DebugAdapterProtocol::notify_stopped_breakpoint(const int &p_id) {
+	Dictionary event = parser->ev_stopped_breakpoint(p_id);
+	for (List<Ref<DAPeer>>::Element *E = clients.front(); E; E = E->next()) {
+		E->get()->res_queue.push_back(event);
+	}
+}
+
+void DebugAdapterProtocol::notify_stopped_step() {
+	Dictionary event = parser->ev_stopped_step();
+	for (List<Ref<DAPeer>>::Element *E = clients.front(); E; E = E->next()) {
+		E->get()->res_queue.push_back(event);
+	}
+}
+
+void DebugAdapterProtocol::notify_continued() {
+	Dictionary event = parser->ev_continued();
+	for (List<Ref<DAPeer>>::Element *E = clients.front(); E; E = E->next()) {
+		if (_current_request == "continue" && E->get() == _current_peer) {
+			continue;
+		}
+		E->get()->res_queue.push_back(event);
+	}
+
+	reset_stack_info();
+}
+
+void DebugAdapterProtocol::notify_output(const String &p_message) {
+	Dictionary event = parser->ev_output(p_message);
+	for (List<Ref<DAPeer>>::Element *E = clients.front(); E; E = E->next()) {
+		E->get()->res_queue.push_back(event);
+	}
+}
+
+Array DebugAdapterProtocol::update_breakpoints(const String &p_path, const Array &p_lines) {
+	Array updated_breakpoints;
+
+	for (int i = 0; i < p_lines.size(); i++) {
+		DAP::Breakpoint breakpoint;
+		breakpoint.verified = true;
+		breakpoint.source.path = p_path;
+		breakpoint.source.compute_checksums();
+		breakpoint.line = p_lines[i];
+
+		List<DAP::Breakpoint>::Element *E = breakpoint_list.find(breakpoint);
+		if (E) {
+			breakpoint.id = E->get().id;
+		} else {
+			breakpoint.id = breakpoint_id++;
+			breakpoint_list.push_back(breakpoint);
+		}
+
+		updated_breakpoints.push_back(breakpoint.to_json());
+	}
+
+	return updated_breakpoints;
+}
+
+void DebugAdapterProtocol::on_debug_paused() {
+	if (EditorNode::get_singleton()->get_pause_button()->is_pressed()) {
+		notify_stopped_paused();
+	} else {
+		notify_continued();
+	}
+}
+
+void DebugAdapterProtocol::on_debug_stopped() {
+	notify_exited();
+	notify_terminated();
+}
+
+void DebugAdapterProtocol::on_debug_output(const String &p_message) {
+	notify_output(p_message);
+}
+
+void DebugAdapterProtocol::on_debug_breaked(const bool &p_reallydid, const bool &p_can_debug, const String &p_reason, const bool &p_has_stackdump) {
+	if (!p_reallydid) {
+		notify_continued();
+		return;
+	}
+
+	if (p_reason == "Breakpoint") {
+		if (_stepping) {
+			notify_stopped_step();
+			_stepping = false;
+		} else {
+			_processing_breakpoint = true; // Wait for stack_dump to find where the breakpoint happened
+		}
+	} else {
+		notify_stopped_exception(p_reason);
+	}
+
+	_processing_stackdump = p_has_stackdump;
+}
+
+void DebugAdapterProtocol::on_debug_stack_dump(const Array &p_stack_dump) {
+	if (_processing_breakpoint && !p_stack_dump.is_empty()) {
+		// Find existing breakpoint
+		Dictionary d = p_stack_dump[0];
+		DAP::Breakpoint breakpoint;
+		breakpoint.source.path = ProjectSettings::get_singleton()->globalize_path(d["file"]);
+		breakpoint.line = d["line"];
+
+		List<DAP::Breakpoint>::Element *E = breakpoint_list.find(breakpoint);
+		if (E) {
+			notify_stopped_breakpoint(E->get().id);
+		}
+
+		_processing_breakpoint = false;
+	}
+
+	stackframe_id = 0;
+	stackframe_list.clear();
+
+	// Fill in stacktrace information
+	for (int i = 0; i < p_stack_dump.size(); i++) {
+		Dictionary stack_info = p_stack_dump[i];
+		DAP::StackFrame stackframe;
+		stackframe.id = stackframe_id++;
+		stackframe.name = stack_info["function"];
+		stackframe.line = stack_info["line"];
+		stackframe.column = 0;
+		stackframe.source.path = ProjectSettings::get_singleton()->globalize_path(stack_info["file"]);
+		stackframe.source.compute_checksums();
+
+		// Information for "Locals", "Members" and "Globals" variables respectively
+		List<int> scope_ids;
+		for (int j = 0; j < 3; j++) {
+			scope_ids.push_back(variable_id++);
+		}
+
+		stackframe_list.insert(stackframe, scope_ids);
+	}
+
+	_current_frame = 0;
+	_processing_stackdump = false;
+}
+
+void DebugAdapterProtocol::on_debug_stack_frame_vars(const int &p_size) {
+	_remaining_vars = p_size;
+	DAP::StackFrame frame;
+	frame.id = _current_frame;
+	ERR_FAIL_COND(!stackframe_list.has(frame));
+	List<int> scope_ids = stackframe_list.find(frame)->value();
+	for (List<int>::Element *E = scope_ids.front(); E; E = E->next()) {
+		int variable_id = E->get();
+		if (variable_list.has(variable_id)) {
+			variable_list.find(variable_id)->value().clear();
+		} else {
+			variable_list.insert(variable_id, Array());
+		}
+	}
+}
+
+void DebugAdapterProtocol::on_debug_stack_frame_var(const Array &p_data) {
+	DebuggerMarshalls::ScriptStackVariable stack_var;
+	stack_var.deserialize(p_data);
+
+	ERR_FAIL_COND(stackframe_list.is_empty());
+	DAP::StackFrame frame;
+	frame.id = _current_frame;
+
+	List<int> scope_ids = stackframe_list.find(frame)->value();
+	ERR_FAIL_COND(scope_ids.size() != 3);
+	ERR_FAIL_INDEX(stack_var.type, 3);
+	int variable_id = scope_ids[stack_var.type];
+
+	DAP::Variable variable;
+
+	variable.name = stack_var.name;
+	variable.value = stack_var.value;
+	variable.type = Variant::get_type_name(stack_var.value.get_type());
+
+	variable_list.find(variable_id)->value().push_back(variable.to_json());
+	_remaining_vars--;
+}
+
+void DebugAdapterProtocol::poll() {
+	if (server->is_connection_available()) {
+		on_client_connected();
+	}
+	List<Ref<DAPeer>> to_delete;
+	for (List<Ref<DAPeer>>::Element *E = clients.front(); E; E = E->next()) {
+		Ref<DAPeer> peer = E->get();
+		StreamPeerTCP::Status status = peer->connection->get_status();
+		if (status == StreamPeerTCP::STATUS_NONE || status == StreamPeerTCP::STATUS_ERROR) {
+			to_delete.push_back(peer);
+		} else {
+			_current_peer = peer;
+			Error err = peer->handle_data();
+			if (err != OK && err != ERR_BUSY) {
+				to_delete.push_back(peer);
+			}
+			err = peer->send_data();
+			if (err != OK && err != ERR_BUSY) {
+				to_delete.push_back(peer);
+			}
+		}
+	}
+
+	for (List<Ref<DAPeer>>::Element *E = to_delete.front(); E; E = E->next()) {
+		on_client_disconnected(E->get());
+	}
+	to_delete.clear();
+}
+
+Error DebugAdapterProtocol::start(int p_port, const IPAddress &p_bind_ip) {
+	_initialized = true;
+	return server->listen(p_port, p_bind_ip);
+}
+
+void DebugAdapterProtocol::stop() {
+	for (List<Ref<DAPeer>>::Element *E = clients.front(); E; E = E->next()) {
+		E->get()->connection->disconnect_from_host();
+	}
+
+	clients.clear();
+	server->stop();
+	_initialized = false;
+}
+
+DebugAdapterProtocol::DebugAdapterProtocol() {
+	server.instantiate();
+	singleton = this;
+	parser = memnew(DebugAdapterParser);
+
+	reset_ids();
+
+	EditorNode *node = EditorNode::get_singleton();
+	node->get_pause_button()->connect("pressed", callable_mp(this, &DebugAdapterProtocol::on_debug_paused));
+
+	EditorDebuggerNode *debugger_node = EditorDebuggerNode::get_singleton();
+	debugger_node->get_default_debugger()->connect("stopped", callable_mp(this, &DebugAdapterProtocol::on_debug_stopped));
+	debugger_node->get_default_debugger()->connect("output", callable_mp(this, &DebugAdapterProtocol::on_debug_output));
+	debugger_node->get_default_debugger()->connect("breaked", callable_mp(this, &DebugAdapterProtocol::on_debug_breaked));
+	debugger_node->get_default_debugger()->connect("stack_dump", callable_mp(this, &DebugAdapterProtocol::on_debug_stack_dump));
+	debugger_node->get_default_debugger()->connect("stack_frame_vars", callable_mp(this, &DebugAdapterProtocol::on_debug_stack_frame_vars));
+	debugger_node->get_default_debugger()->connect("stack_frame_var", callable_mp(this, &DebugAdapterProtocol::on_debug_stack_frame_var));
+}
+
+DebugAdapterProtocol::~DebugAdapterProtocol() {
+	memdelete(parser);
+}
diff --git a/editor/debugger/debug_adapter/debug_adapter_protocol.h b/editor/debugger/debug_adapter/debug_adapter_protocol.h
new file mode 100644
index 0000000000..6b542033ed
--- /dev/null
+++ b/editor/debugger/debug_adapter/debug_adapter_protocol.h
@@ -0,0 +1,140 @@
+/*************************************************************************/
+/*  debug_adapter_protocol.h                                             */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 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 DEBUG_ADAPTER_PROTOCOL_H
+#define DEBUG_ADAPTER_PROTOCOL_H
+
+#include "core/io/stream_peer.h"
+#include "core/io/stream_peer_tcp.h"
+#include "core/io/tcp_server.h"
+
+#include "debug_adapter_parser.h"
+#include "debug_adapter_types.h"
+
+#define DAP_MAX_BUFFER_SIZE 4194304 // 4MB
+#define DAP_MAX_CLIENTS 8
+
+class DebugAdapterParser;
+
+struct DAPeer : RefCounted {
+	Ref<StreamPeerTCP> connection;
+
+	uint8_t req_buf[DAP_MAX_BUFFER_SIZE];
+	int req_pos = 0;
+	bool has_header = false;
+	int content_length = 0;
+	List<Dictionary> res_queue;
+	int seq = 0;
+
+	// Client specific info
+	bool linesStartAt1 = false;
+	bool columnsStartAt1 = false;
+	bool supportsVariableType = false;
+	bool supportsInvalidatedEvent = false;
+
+	Error handle_data();
+	Error send_data();
+	String format_output(const Dictionary &p_params) const;
+};
+
+class DebugAdapterProtocol : public Object {
+	GDCLASS(DebugAdapterProtocol, Object)
+
+	friend class DebugAdapterParser;
+
+private:
+	static DebugAdapterProtocol *singleton;
+	DebugAdapterParser *parser;
+
+	List<Ref<DAPeer>> clients;
+	Ref<TCPServer> server;
+
+	Error on_client_connected();
+	void on_client_disconnected(const Ref<DAPeer> &p_peer);
+	void on_debug_paused();
+	void on_debug_stopped();
+	void on_debug_output(const String &p_message);
+	void on_debug_breaked(const bool &p_reallydid, const bool &p_can_debug, const String &p_reason, const bool &p_has_stackdump);
+	void on_debug_stack_dump(const Array &p_stack_dump);
+	void on_debug_stack_frame_vars(const int &p_size);
+	void on_debug_stack_frame_var(const Array &p_data);
+
+	void reset_current_info();
+	void reset_ids();
+	void reset_stack_info();
+
+	bool _initialized = false;
+	bool _processing_breakpoint = false;
+	bool _stepping = false;
+	bool _processing_stackdump = false;
+	int _remaining_vars = 0;
+	int _current_frame = 0;
+
+	String _current_request;
+	Ref<DAPeer> _current_peer;
+
+	int breakpoint_id;
+	int stackframe_id;
+	int variable_id;
+	List<DAP::Breakpoint> breakpoint_list;
+	Map<DAP::StackFrame, List<int>> stackframe_list;
+	Map<int, Array> variable_list;
+
+public:
+	_FORCE_INLINE_ static DebugAdapterProtocol *get_singleton() { return singleton; }
+	_FORCE_INLINE_ bool is_active() const { return _initialized && clients.size() > 0; }
+
+	bool process_message(const String &p_text);
+
+	String get_current_request() const { return _current_request; }
+	Ref<DAPeer> get_current_peer() const { return _current_peer; }
+
+	void notify_initialized();
+	void notify_process();
+	void notify_terminated();
+	void notify_exited(const int &p_exitcode = 0);
+	void notify_stopped_paused();
+	void notify_stopped_exception(const String &p_error);
+	void notify_stopped_breakpoint(const int &p_id);
+	void notify_stopped_step();
+	void notify_continued();
+	void notify_output(const String &p_message);
+
+	Array update_breakpoints(const String &p_path, const Array &p_breakpoints);
+
+	void poll();
+	Error start(int p_port, const IPAddress &p_bind_ip);
+	void stop();
+
+	DebugAdapterProtocol();
+	~DebugAdapterProtocol();
+};
+
+#endif
diff --git a/editor/debugger/debug_adapter/debug_adapter_server.cpp b/editor/debugger/debug_adapter/debug_adapter_server.cpp
new file mode 100644
index 0000000000..f9092a1791
--- /dev/null
+++ b/editor/debugger/debug_adapter/debug_adapter_server.cpp
@@ -0,0 +1,102 @@
+/*************************************************************************/
+/*  debug_adapter_server.cpp                                             */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 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.                */
+/*************************************************************************/
+
+#include "debug_adapter_server.h"
+
+#include "core/os/os.h"
+#include "editor/editor_log.h"
+#include "editor/editor_node.h"
+
+DebugAdapterServer::DebugAdapterServer() {
+	_EDITOR_DEF("network/debug_adapter/remote_port", remote_port);
+	_EDITOR_DEF("network/debug_adapter/use_thread", use_thread);
+}
+
+void DebugAdapterServer::_notification(int p_what) {
+	switch (p_what) {
+		case NOTIFICATION_ENTER_TREE:
+			start();
+			break;
+		case NOTIFICATION_EXIT_TREE:
+			stop();
+			break;
+		case NOTIFICATION_INTERNAL_PROCESS: {
+			// The main loop can be run again during request processing, which modifies internal state of the protocol.
+			// Thus, "polling" is needed to prevent it from parsing other requests while the current one isn't finished.
+			if (started && !use_thread && !polling) {
+				polling = true;
+				protocol.poll();
+				polling = false;
+			}
+		} break;
+		case EditorSettings::NOTIFICATION_EDITOR_SETTINGS_CHANGED: {
+			int remote_port = (int)_EDITOR_GET("network/debug_adapter/remote_port");
+			bool use_thread = (bool)_EDITOR_GET("network/debug_adapter/use_thread");
+			if (remote_port != this->remote_port || use_thread != this->use_thread) {
+				this->stop();
+				this->start();
+			}
+		} break;
+	}
+}
+
+void DebugAdapterServer::thread_func(void *p_userdata) {
+	DebugAdapterServer *self = static_cast<DebugAdapterServer *>(p_userdata);
+	while (self->thread_running) {
+		// Poll 20 times per second
+		self->protocol.poll();
+		OS::get_singleton()->delay_usec(50000);
+	}
+}
+
+void DebugAdapterServer::start() {
+	remote_port = (int)_EDITOR_GET("network/debug_adapter/remote_port");
+	use_thread = (bool)_EDITOR_GET("network/debug_adapter/use_thread");
+	if (protocol.start(remote_port, IPAddress("127.0.0.1")) == OK) {
+		EditorNode::get_log()->add_message("--- Debug adapter server started ---", EditorLog::MSG_TYPE_EDITOR);
+		if (use_thread) {
+			thread_running = true;
+			thread.start(DebugAdapterServer::thread_func, this);
+		}
+		set_process_internal(!use_thread);
+		started = true;
+	}
+}
+
+void DebugAdapterServer::stop() {
+	if (use_thread) {
+		ERR_FAIL_COND(!thread.is_started());
+		thread_running = false;
+		thread.wait_to_finish();
+	}
+	protocol.stop();
+	started = false;
+	EditorNode::get_log()->add_message("--- Debug adapter server stopped ---", EditorLog::MSG_TYPE_EDITOR);
+}
diff --git a/editor/debugger/debug_adapter/debug_adapter_server.h b/editor/debugger/debug_adapter/debug_adapter_server.h
new file mode 100644
index 0000000000..f8a38965cc
--- /dev/null
+++ b/editor/debugger/debug_adapter/debug_adapter_server.h
@@ -0,0 +1,59 @@
+/*************************************************************************/
+/*  debug_adapter_server.h                                               */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 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 DEBUG_ADAPTER_SERVER_H
+#define DEBUG_ADAPTER_SERVER_H
+
+#include "debug_adapter_protocol.h"
+#include "editor/editor_plugin.h"
+
+class DebugAdapterServer : public EditorPlugin {
+	GDCLASS(DebugAdapterServer, EditorPlugin);
+
+	DebugAdapterProtocol protocol;
+
+	Thread thread;
+	int remote_port = 6006;
+	bool thread_running = false;
+	bool started = false;
+	bool use_thread = false;
+	bool polling = false;
+	static void thread_func(void *p_userdata);
+
+private:
+	void _notification(int p_what);
+
+public:
+	DebugAdapterServer();
+	void start();
+	void stop();
+};
+
+#endif
diff --git a/editor/debugger/debug_adapter/debug_adapter_types.h b/editor/debugger/debug_adapter/debug_adapter_types.h
new file mode 100644
index 0000000000..aa9ab1adcd
--- /dev/null
+++ b/editor/debugger/debug_adapter/debug_adapter_types.h
@@ -0,0 +1,270 @@
+/*************************************************************************/
+/*  debug_adapter_types.h                                                */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 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 DEBUG_ADAPTER_TYPES_H
+#define DEBUG_ADAPTER_TYPES_H
+
+#include "core/io/json.h"
+#include "core/variant/dictionary.h"
+
+namespace DAP {
+
+enum ErrorType {
+	UNKNOWN,
+	WRONG_PATH
+};
+
+struct Checksum {
+	String algorithm;
+	String checksum;
+
+	_FORCE_INLINE_ Dictionary to_json() const {
+		Dictionary dict;
+		dict["algorithm"] = algorithm;
+		dict["checksum"] = checksum;
+
+		return dict;
+	}
+};
+
+struct Source {
+private:
+	Array _checksums;
+
+public:
+	String name;
+	String path;
+
+	void compute_checksums() {
+		ERR_FAIL_COND(path.is_empty());
+
+		// MD5
+		Checksum md5;
+		md5.algorithm = "MD5";
+		md5.checksum = FileAccess::get_md5(path);
+
+		// SHA-256
+		Checksum sha256;
+		sha256.algorithm = "SHA256";
+		sha256.checksum = FileAccess::get_sha256(path);
+
+		_checksums.push_back(md5.to_json());
+		_checksums.push_back(sha256.to_json());
+	}
+
+	_FORCE_INLINE_ void from_json(const Dictionary &p_params) {
+		name = p_params["name"];
+		path = p_params["path"];
+		_checksums = p_params["checksums"];
+	}
+
+	_FORCE_INLINE_ Dictionary to_json() const {
+		Dictionary dict;
+		dict["name"] = name;
+		dict["path"] = path;
+		dict["checksums"] = _checksums;
+
+		return dict;
+	}
+};
+
+struct Breakpoint {
+	int id;
+	bool verified;
+	Source source;
+	int line;
+
+	bool operator==(const Breakpoint &p_other) const {
+		return source.path == p_other.source.path && line == p_other.line;
+	}
+
+	_FORCE_INLINE_ Dictionary to_json() const {
+		Dictionary dict;
+		dict["id"] = id;
+		dict["verified"] = verified;
+		dict["source"] = source.to_json();
+		dict["line"] = line;
+
+		return dict;
+	}
+};
+
+struct BreakpointLocation {
+	int line;
+
+	_FORCE_INLINE_ Dictionary to_json() const {
+		Dictionary dict;
+		dict["line"] = line;
+
+		return dict;
+	}
+};
+
+struct Capabilities {
+	bool supportsConfigurationDoneRequest = true;
+	bool supportsEvaluateForHovers = true;
+	bool supportsSetVariable = true;
+	String supportedChecksumAlgorithms[2] = { "MD5", "SHA256" };
+	bool supportsRestartRequest = true;
+	bool supportsValueFormattingOptions = true;
+	bool supportTerminateDebuggee = true;
+	bool supportSuspendDebuggee = true;
+	bool supportsTerminateRequest = true;
+	bool supportsBreakpointLocationsRequest = true;
+
+	_FORCE_INLINE_ Dictionary to_json() const {
+		Dictionary dict;
+		dict["supportsConfigurationDoneRequest"] = supportsConfigurationDoneRequest;
+		dict["supportsEvaluateForHovers"] = supportsEvaluateForHovers;
+		dict["supportsSetVariable"] = supportsSetVariable;
+		dict["supportsRestartRequest"] = supportsRestartRequest;
+		dict["supportsValueFormattingOptions"] = supportsValueFormattingOptions;
+		dict["supportTerminateDebuggee"] = supportTerminateDebuggee;
+		dict["supportSuspendDebuggee"] = supportSuspendDebuggee;
+		dict["supportsTerminateRequest"] = supportsTerminateRequest;
+		dict["supportsBreakpointLocationsRequest"] = supportsBreakpointLocationsRequest;
+
+		Array arr;
+		arr.push_back(supportedChecksumAlgorithms[0]);
+		arr.push_back(supportedChecksumAlgorithms[1]);
+		dict["supportedChecksumAlgorithms"] = arr;
+
+		return dict;
+	}
+};
+
+struct Message {
+	int id;
+	String format;
+	bool sendTelemetry = false; // Just in case :)
+	bool showUser;
+	Dictionary variables;
+
+	_FORCE_INLINE_ Dictionary to_json() const {
+		Dictionary dict;
+		dict["id"] = id;
+		dict["format"] = format;
+		dict["sendTelemetry"] = sendTelemetry;
+		dict["showUser"] = showUser;
+		dict["variables"] = variables;
+
+		return dict;
+	}
+};
+
+struct Scope {
+	String name;
+	String presentationHint;
+	int variablesReference;
+	bool expensive;
+
+	_FORCE_INLINE_ Dictionary to_json() const {
+		Dictionary dict;
+		dict["name"] = name;
+		dict["presentationHint"] = presentationHint;
+		dict["variablesReference"] = variablesReference;
+		dict["expensive"] = expensive;
+
+		return dict;
+	}
+};
+
+struct SourceBreakpoint {
+	int line;
+
+	_FORCE_INLINE_ void from_json(const Dictionary &p_params) {
+		line = p_params["line"];
+	}
+};
+
+struct StackFrame {
+	int id;
+	String name;
+	Source source;
+	int line;
+	int column;
+
+	bool operator<(const StackFrame &p_other) const {
+		return id < p_other.id;
+	}
+
+	_FORCE_INLINE_ void from_json(const Dictionary &p_params) {
+		id = p_params["id"];
+		name = p_params["name"];
+		source.from_json(p_params["source"]);
+		line = p_params["line"];
+		column = p_params["column"];
+	}
+
+	_FORCE_INLINE_ Dictionary to_json() const {
+		Dictionary dict;
+		dict["id"] = id;
+		dict["name"] = name;
+		dict["source"] = source.to_json();
+		dict["line"] = line;
+		dict["column"] = column;
+
+		return dict;
+	}
+};
+
+struct Thread {
+	int id;
+	String name;
+
+	_FORCE_INLINE_ Dictionary to_json() const {
+		Dictionary dict;
+		dict["id"] = id;
+		dict["name"] = name;
+
+		return dict;
+	}
+};
+
+struct Variable {
+	String name;
+	String value;
+	String type;
+	int variablesReference = 0;
+
+	_FORCE_INLINE_ Dictionary to_json() const {
+		Dictionary dict;
+		dict["name"] = name;
+		dict["value"] = value;
+		dict["type"] = type;
+		dict["variablesReference"] = variablesReference;
+
+		return dict;
+	}
+};
+
+} // namespace DAP
+
+#endif
diff --git a/editor/debugger/editor_debugger_node.cpp b/editor/debugger/editor_debugger_node.cpp
index 690ce98cb9..5d654ca756 100644
--- a/editor/debugger/editor_debugger_node.cpp
+++ b/editor/debugger/editor_debugger_node.cpp
@@ -466,7 +466,7 @@ void EditorDebuggerNode::_paused() {
 	});
 }
 
-void EditorDebuggerNode::_breaked(bool p_breaked, bool p_can_debug, int p_debugger) {
+void EditorDebuggerNode::_breaked(bool p_breaked, bool p_can_debug, String p_message, bool p_has_stackdump, int p_debugger) {
 	if (get_current_debugger() != get_debugger(p_debugger)) {
 		if (!p_breaked) {
 			return;
@@ -489,6 +489,19 @@ void EditorDebuggerNode::set_breakpoint(const String &p_path, int p_line, bool p
 	});
 }
 
+void EditorDebuggerNode::set_breakpoints(const String &p_path, Array p_lines) {
+	for (int i = 0; i < p_lines.size(); i++) {
+		set_breakpoint(p_path, p_lines[i], true);
+	}
+
+	for (Map<Breakpoint, bool>::Element *E = breakpoints.front(); E; E = E->next()) {
+		Breakpoint b = E->key();
+		if (b.source == p_path && !p_lines.has(b.line)) {
+			set_breakpoint(p_path, b.line, false);
+		}
+	}
+}
+
 void EditorDebuggerNode::reload_scripts() {
 	_for_all(tabs, [&](ScriptEditorDebugger *dbg) {
 		dbg->reload_scripts();
diff --git a/editor/debugger/editor_debugger_node.h b/editor/debugger/editor_debugger_node.h
index 9a40383c17..0849ecf1c9 100644
--- a/editor/debugger/editor_debugger_node.h
+++ b/editor/debugger/editor_debugger_node.h
@@ -35,6 +35,7 @@
 #include "scene/gui/margin_container.h"
 
 class Button;
+class DebugAdapterParser;
 class EditorDebuggerTree;
 class EditorDebuggerRemoteObject;
 class MenuButton;
@@ -109,6 +110,7 @@ private:
 	EditorDebuggerRemoteObject *get_inspected_remote_object();
 
 	friend class DebuggerEditorPlugin;
+	friend class DebugAdapterParser;
 	static EditorDebuggerNode *singleton;
 	EditorDebuggerNode();
 
@@ -129,7 +131,7 @@ protected:
 	void _text_editor_stack_goto(const ScriptEditorDebugger *p_debugger);
 	void _stack_frame_selected(int p_debugger);
 	void _error_selected(const String &p_file, int p_line, int p_debugger);
-	void _breaked(bool p_breaked, bool p_can_debug, int p_debugger);
+	void _breaked(bool p_breaked, bool p_can_debug, String p_message, bool p_has_stackdump, int p_debugger);
 	void _paused();
 	void _break_state_changed();
 	void _menu_option(int p_id);
@@ -164,6 +166,7 @@ public:
 
 	bool is_skip_breakpoints() const;
 	void set_breakpoint(const String &p_path, int p_line, bool p_enabled);
+	void set_breakpoints(const String &p_path, Array p_lines);
 	void reload_scripts();
 
 	// Remote inspector/edit.
diff --git a/editor/debugger/script_editor_debugger.cpp b/editor/debugger/script_editor_debugger.cpp
index 9856fbec74..2a5013893f 100644
--- a/editor/debugger/script_editor_debugger.cpp
+++ b/editor/debugger/script_editor_debugger.cpp
@@ -37,6 +37,7 @@
 #include "core/string/ustring.h"
 #include "core/version.h"
 #include "core/version_hash.gen.h"
+#include "editor/debugger/debug_adapter/debug_adapter_protocol.h"
 #include "editor/debugger/editor_network_profiler.h"
 #include "editor/debugger/editor_performance_profiler.h"
 #include "editor/debugger/editor_profiler.h"
@@ -298,15 +299,18 @@ void ScriptEditorDebugger::_parse_message(const String &p_msg, const Array &p_da
 	if (p_msg == "debug_enter") {
 		_put_msg("get_stack_dump", Array());
 
-		ERR_FAIL_COND(p_data.size() != 2);
+		ERR_FAIL_COND(p_data.size() != 3);
 		bool can_continue = p_data[0];
 		String error = p_data[1];
+		bool has_stackdump = p_data[2];
 		breaked = true;
 		can_debug = can_continue;
 		_update_buttons_state();
 		_set_reason_text(error, MESSAGE_ERROR);
-		emit_signal(SNAME("breaked"), true, can_continue);
-		DisplayServer::get_singleton()->window_move_to_foreground();
+		emit_signal(SNAME("breaked"), true, can_continue, error, has_stackdump);
+		if (is_move_to_foreground()) {
+			DisplayServer::get_singleton()->window_move_to_foreground();
+		}
 		if (error != "") {
 			tabs->set_current_tab(0);
 		}
@@ -319,7 +323,7 @@ void ScriptEditorDebugger::_parse_message(const String &p_msg, const Array &p_da
 		_clear_execution();
 		_update_buttons_state();
 		_set_reason_text(TTR("Execution resumed."), MESSAGE_SUCCESS);
-		emit_signal(SNAME("breaked"), false, false);
+		emit_signal(SNAME("breaked"), false, false, "", false);
 		profiler->set_enabled(true);
 		profiler->disable_seeking();
 	} else if (p_msg == "set_pid") {
@@ -373,6 +377,8 @@ void ScriptEditorDebugger::_parse_message(const String &p_msg, const Array &p_da
 		inspector->clear_stack_variables();
 		TreeItem *r = stack_dump->create_item();
 
+		Array stack_dump_info;
+
 		for (int i = 0; i < stack.frames.size(); i++) {
 			TreeItem *s = stack_dump->create_item(r);
 			Dictionary d;
@@ -380,6 +386,7 @@ void ScriptEditorDebugger::_parse_message(const String &p_msg, const Array &p_da
 			d["file"] = stack.frames[i].file;
 			d["function"] = stack.frames[i].func;
 			d["line"] = stack.frames[i].line;
+			stack_dump_info.push_back(d);
 			s->set_metadata(0, d);
 
 			String line = itos(i) + " - " + String(d["file"]) + ":" + itos(d["line"]) + " - at function: " + d["function"];
@@ -389,11 +396,15 @@ void ScriptEditorDebugger::_parse_message(const String &p_msg, const Array &p_da
 				s->select(0);
 			}
 		}
+		emit_signal("stack_dump", stack_dump_info);
 	} else if (p_msg == "stack_frame_vars") {
 		inspector->clear_stack_variables();
+		ERR_FAIL_COND(p_data.size() != 1);
+		emit_signal("stack_frame_vars", p_data[0]);
 
 	} else if (p_msg == "stack_frame_var") {
 		inspector->add_stack_variable(p_data);
+		emit_signal("stack_frame_var", p_data);
 
 	} else if (p_msg == "output") {
 		ERR_FAIL_COND(p_data.size() != 2);
@@ -422,6 +433,7 @@ void ScriptEditorDebugger::_parse_message(const String &p_msg, const Array &p_da
 				} break;
 			}
 			EditorNode::get_log()->add_message(output_strings[i], msg_type);
+			emit_signal("output", output_strings[i]);
 		}
 	} else if (p_msg == "performance:profile_frame") {
 		Vector<float> frame_data;
@@ -963,11 +975,7 @@ void ScriptEditorDebugger::_stack_dump_frame_selected() {
 
 	int frame = get_stack_script_frame();
 
-	if (is_session_active() && frame >= 0) {
-		Array msg;
-		msg.push_back(frame);
-		_put_msg("get_stack_frame_vars", msg);
-	} else {
+	if (!request_stack_dump(frame)) {
 		inspector->edit(nullptr);
 	}
 }
@@ -1130,6 +1138,14 @@ void ScriptEditorDebugger::_property_changed(Object *p_base, const StringName &p
 	}
 }
 
+bool ScriptEditorDebugger::is_move_to_foreground() const {
+	return move_to_foreground;
+}
+
+void ScriptEditorDebugger::set_move_to_foreground(const bool &p_move_to_foreground) {
+	move_to_foreground = p_move_to_foreground;
+}
+
 String ScriptEditorDebugger::get_stack_script_file() const {
 	TreeItem *ti = stack_dump->get_selected();
 	if (!ti) {
@@ -1157,6 +1173,15 @@ int ScriptEditorDebugger::get_stack_script_frame() const {
 	return d["frame"];
 }
 
+bool ScriptEditorDebugger::request_stack_dump(const int &p_frame) {
+	ERR_FAIL_COND_V(!is_session_active() || p_frame < 0, false);
+
+	Array msg;
+	msg.push_back(p_frame);
+	_put_msg("get_stack_frame_vars", msg);
+	return true;
+}
+
 void ScriptEditorDebugger::set_live_debugging(bool p_enable) {
 	live_debug = p_enable;
 }
@@ -1469,11 +1494,15 @@ void ScriptEditorDebugger::_bind_methods() {
 	ADD_SIGNAL(MethodInfo("error_selected", PropertyInfo(Variant::INT, "error")));
 	ADD_SIGNAL(MethodInfo("set_execution", PropertyInfo("script"), PropertyInfo(Variant::INT, "line")));
 	ADD_SIGNAL(MethodInfo("clear_execution", PropertyInfo("script")));
-	ADD_SIGNAL(MethodInfo("breaked", PropertyInfo(Variant::BOOL, "reallydid"), PropertyInfo(Variant::BOOL, "can_debug")));
+	ADD_SIGNAL(MethodInfo("breaked", PropertyInfo(Variant::BOOL, "reallydid"), PropertyInfo(Variant::BOOL, "can_debug"), PropertyInfo(Variant::STRING, "reason"), PropertyInfo(Variant::BOOL, "has_stackdump")));
 	ADD_SIGNAL(MethodInfo("remote_object_requested", PropertyInfo(Variant::INT, "id")));
 	ADD_SIGNAL(MethodInfo("remote_object_updated", PropertyInfo(Variant::INT, "id")));
 	ADD_SIGNAL(MethodInfo("remote_object_property_updated", PropertyInfo(Variant::INT, "id"), PropertyInfo(Variant::STRING, "property")));
 	ADD_SIGNAL(MethodInfo("remote_tree_updated"));
+	ADD_SIGNAL(MethodInfo("output"));
+	ADD_SIGNAL(MethodInfo("stack_dump", PropertyInfo(Variant::ARRAY, "stack_dump")));
+	ADD_SIGNAL(MethodInfo("stack_frame_vars", PropertyInfo(Variant::INT, "num_vars")));
+	ADD_SIGNAL(MethodInfo("stack_frame_var", PropertyInfo(Variant::ARRAY, "data")));
 }
 
 void ScriptEditorDebugger::add_debugger_plugin(const Ref<Script> &p_script) {
diff --git a/editor/debugger/script_editor_debugger.h b/editor/debugger/script_editor_debugger.h
index a5731c9f9c..499dda86da 100644
--- a/editor/debugger/script_editor_debugger.h
+++ b/editor/debugger/script_editor_debugger.h
@@ -55,11 +55,15 @@ class EditorNetworkProfiler;
 class EditorPerformanceProfiler;
 class SceneDebuggerTree;
 class EditorDebuggerPlugin;
+class DebugAdapterProtocol;
+class DebugAdapterParser;
 
 class ScriptEditorDebugger : public MarginContainer {
 	GDCLASS(ScriptEditorDebugger, MarginContainer);
 
 	friend class EditorDebuggerNode;
+	friend class DebugAdapterProtocol;
+	friend class DebugAdapterParser;
 
 private:
 	enum MessageType {
@@ -147,6 +151,7 @@ private:
 	OS::ProcessID remote_pid = 0;
 	bool breaked = false;
 	bool can_debug = false;
+	bool move_to_foreground = true;
 
 	bool live_debug;
 
@@ -230,12 +235,17 @@ public:
 	bool is_session_active() { return peer.is_valid() && peer->is_peer_connected(); };
 	int get_remote_pid() const { return remote_pid; }
 
+	bool is_move_to_foreground() const;
+	void set_move_to_foreground(const bool &p_move_to_foreground);
+
 	int get_error_count() const { return error_count; }
 	int get_warning_count() const { return warning_count; }
 	String get_stack_script_file() const;
 	int get_stack_script_line() const;
 	int get_stack_script_frame() const;
 
+	bool request_stack_dump(const int &p_frame);
+
 	void update_tabs();
 	void clear_style();
 	String get_var_value(const String &p_var) const;
diff --git a/editor/editor_node.cpp b/editor/editor_node.cpp
index 2c54cb0c6b..20710b192c 100644
--- a/editor/editor_node.cpp
+++ b/editor/editor_node.cpp
@@ -70,6 +70,7 @@
 #include "servers/rendering/rendering_device.h"
 
 #include "editor/audio_stream_preview.h"
+#include "editor/debugger/debug_adapter/debug_adapter_server.h"
 #include "editor/debugger/editor_debugger_node.h"
 #include "editor/dependency_editor.h"
 #include "editor/editor_about.h"
@@ -6741,6 +6742,7 @@ EditorNode::EditorNode() {
 	//plugin stuff
 
 	add_editor_plugin(memnew(DebuggerEditorPlugin(this, debug_menu)));
+	add_editor_plugin(memnew(DebugAdapterServer()));
 
 	disk_changed = memnew(ConfirmationDialog);
 	{
diff --git a/editor/plugins/editor_debugger_plugin.cpp b/editor/plugins/editor_debugger_plugin.cpp
index 89073b7189..5f3b11ac42 100644
--- a/editor/plugins/editor_debugger_plugin.cpp
+++ b/editor/plugins/editor_debugger_plugin.cpp
@@ -32,7 +32,7 @@
 
 #include "editor/debugger/script_editor_debugger.h"
 
-void EditorDebuggerPlugin::_breaked(bool p_really_did, bool p_can_debug) {
+void EditorDebuggerPlugin::_breaked(bool p_really_did, bool p_can_debug, String p_message, bool p_has_stackdump) {
 	if (p_really_did) {
 		emit_signal(SNAME("breaked"), p_can_debug);
 	} else {
diff --git a/editor/plugins/editor_debugger_plugin.h b/editor/plugins/editor_debugger_plugin.h
index b33a8ed925..5995d790c5 100644
--- a/editor/plugins/editor_debugger_plugin.h
+++ b/editor/plugins/editor_debugger_plugin.h
@@ -41,7 +41,7 @@ class EditorDebuggerPlugin : public Control {
 private:
 	ScriptEditorDebugger *debugger = nullptr;
 
-	void _breaked(bool p_really_did, bool p_can_debug);
+	void _breaked(bool p_really_did, bool p_can_debug, String p_message, bool p_has_stackdump);
 	void _started();
 	void _stopped();
 
diff --git a/modules/gdscript/language_server/gdscript_language_protocol.cpp b/modules/gdscript/language_server/gdscript_language_protocol.cpp
index 0d1f98778e..b6c48468f5 100644
--- a/modules/gdscript/language_server/gdscript_language_protocol.cpp
+++ b/modules/gdscript/language_server/gdscript_language_protocol.cpp
@@ -128,13 +128,13 @@ Error GDScriptLanguageProtocol::on_client_connected() {
 	peer->connection = tcp_peer;
 	clients.set(next_client_id, peer);
 	next_client_id++;
-	EditorNode::get_log()->add_message("Connection Taken", EditorLog::MSG_TYPE_EDITOR);
+	EditorNode::get_log()->add_message("[LSP] Connection Taken", EditorLog::MSG_TYPE_EDITOR);
 	return OK;
 }
 
 void GDScriptLanguageProtocol::on_client_disconnected(const int &p_client_id) {
 	clients.erase(p_client_id);
-	EditorNode::get_log()->add_message("Disconnected", EditorLog::MSG_TYPE_EDITOR);
+	EditorNode::get_log()->add_message("[LSP] Disconnected", EditorLog::MSG_TYPE_EDITOR);
 }
 
 String GDScriptLanguageProtocol::process_message(const String &p_text) {