[3.x] Debugger doesn't show stack variables in specific conditions

[boruok]

Godot version

v3.5.2.stable.official [170ba33]

System information

Ubuntu 22.04.2 LTS, GLES2

Issue description

debugger doesn't show stack variables with autoload and resource with overridden _get method in the same scene:

# game.gd
extends Node


export var resource : Resource


func _ready() -> void:
	var foo := 2023
	var bar := "hello world"

# resource.gd
extends Resource


var _data := {}


func _get(property: String):  # Variant
	return _data[property]

# managers.gd
extends Node

the way to fix this is comment _get method in resource.gd or remove autoload from project settings.

Steps to reproduce

1. launch attachment
2. add breakpoint in game.gd

Minimal reproduction project

New Game Project.zip

[dalexeev]

Does the bug happen if you return valid property info in _get_property_list()? I believe that this is a necessary condition for the debugger to work correctly, otherwise Godot will not know that this property exists.

[dalexeev]

I reproduce it. The bug is not in the resource properties, but in the absence of all variables in the debugger. However, the bug can be workarounded:

func _get(property: String):  # Variant
    #return _data[property]
    return _data.get(property)

I noticed the following warning that goes away with this change, probably related:

New Game Project.zip

editor/script_editor_debugger.cpp:1498 - Condition "cmd.get_type() != Variant::STRING" is true.

It can also crash the engine:

temp-45343.zip

handle_crash: Program crashed with signal 4
Engine version: Godot Engine v3.5.1.stable.custom_build (6fed1ffa313c6760fa88b368ae580378daaef0f0)
Dumping the backtrace. Please include this when reporting the bug to the project developer.
[1] /lib/x86_64-linux-gnu/libc.so.6(+0x3c4b0) [0x7fb6bd43c4b0] (??:0)
[2] CowData<Variant>::get(int) const (/opt/godot/./core/cowdata.h:150 (discriminator 7))
[3] Vector<Variant>::operator[](int) const (/opt/godot/./core/vector.h:88)
[4] Array::operator[](int) const (/opt/godot/core/array.cpp:79)
[5] ScriptEditorDebugger::_parse_message(String const&, Array const&) (/opt/godot/editor/script_editor_debugger.cpp:790)
[6] ScriptEditorDebugger::_notification(int) (/opt/godot/editor/script_editor_debugger.cpp:1485)
[7] ScriptEditorDebugger::_notificationv(int, bool) (/opt/godot/editor/script_editor_debugger.h:59 (discriminator 14))
[8] Object::notification(int, bool) (/opt/godot/core/object.cpp:929)
[9] SceneTree::_notify_group_pause(StringName const&, int) (/opt/godot/scene/main/scene_tree.cpp:1105)
[10] SceneTree::idle(float) (/opt/godot/scene/main/scene_tree.cpp:608 (discriminator 3))
[11] Main::iteration() (/opt/godot/main/main.cpp:2298)
[12] OS_X11::run() (/opt/godot/platform/x11/os_x11.cpp:3987)
[13] /home/danil/ /godot.x11.tools.64(main+0x138) [0x185ab1e] (/opt/godot/platform/x11/godot_x11.cpp:61)
[14] /lib/x86_64-linux-gnu/libc.so.6(+0x23a90) [0x7fb6bd423a90] (??:0)
[15] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x89) [0x7fb6bd423b49] (??:0)
[16] /home/danil/ /godot.x11.tools.64(_start+0x2e) [0x185a92e] (??:?)
-- END OF BACKTRACE --
==========================

In this case, only the editor crashes, the child process stays.