Add an OS.crash() method for testing system crash handler (3.x)

[Calinou]

3.x version of #55603.

This makes it possible to test the system's crash handler without having to modify engine code or exploit an engine bug.

Preview (3.x)

extends Node


func _ready():
	OS.crash("Testing crash handler.")

Results in:

ERROR: Testing crash handler.
   at: crash (core/bind/core_bind.cpp:1186)

================================================================
handle_crash: Program crashed with signal 4
Engine version: Godot Engine v3.5.beta.custom_build (ade0e700f1407e92414484d96f20f57bf63cc4d2)
Dumping the backtrace. Please include this when reporting the bug on https://github.com/godotengine/godot/issues
[1] /lib64/libc.so.6(+0x3d320) [0x7fd0dbded320] (??:0)
[2] _OS::crash(String const&) (/home/hugo/Documents/Git/godotengine/godot/core/bind/core_bind.cpp:1186)
[3] MethodBind1<String const&>::call(Object*, Variant const**, int, Variant::CallError&) (/home/hugo/Documents/Git/godotengine/godot/./core/method_bind.gen.inc:775)
[4] Object::call(StringName const&, Variant const**, int, Variant::CallError&) (/home/hugo/Documents/Git/godotengine/godot/core/object.cpp:918)
[5] Variant::call_ptr(StringName const&, Variant const**, int, Variant*, Variant::CallError&) (/home/hugo/Documents/Git/godotengine/godot/core/variant_call.cpp:1180)
[6] GDScriptFunction::call(GDScriptInstance*, Variant const**, int, Variant::CallError&, GDScriptFunction::CallState*) (/home/hugo/Documents/Git/godotengine/godot/modules/gdscript/gdscript_function.cpp:1046)
[7] GDScriptInstance::_ml_call_reversed(GDScript*, StringName const&, Variant const**, int) (/home/hugo/Documents/Git/godotengine/godot/modules/gdscript/gdscript.cpp:1209)
[8] GDScriptInstance::call_multilevel_reversed(StringName const&, Variant const**, int) (/home/hugo/Documents/Git/godotengine/godot/modules/gdscript/gdscript.cpp:1217)
[9] Node::_notification(int) (/home/hugo/Documents/Git/godotengine/godot/scene/main/node.cpp:149)
[10] Node::_notificationv(int, bool) (/home/hugo/Documents/Git/godotengine/godot/./scene/main/node.h:45)
[11] CanvasItem::_notificationv(int, bool) (/home/hugo/Documents/Git/godotengine/godot/./scene/2d/canvas_item.h:?)
[12] Node2D::_notificationv(int, bool) (/home/hugo/Documents/Git/godotengine/godot/./scene/2d/node_2d.h:?)
[13] Object::notification(int, bool) (/home/hugo/Documents/Git/godotengine/godot/core/object.cpp:927)
[14] Node::_propagate_ready() (/home/hugo/Documents/Git/godotengine/godot/scene/main/node.cpp:187)
[15] Node::_propagate_ready() (/home/hugo/Documents/Git/godotengine/godot/scene/main/node.cpp:178)
[16] Node::_set_tree(SceneTree*) (/home/hugo/Documents/Git/godotengine/godot/scene/main/node.cpp:?)
[17] SceneTree::init() (/home/hugo/Documents/Git/godotengine/godot/scene/main/scene_tree.cpp:472)
[18] OS_X11::run() (/home/hugo/Documents/Git/godotengine/godot/platform/x11/os_x11.cpp:?)
[19] /home/hugo/Documents/Git/godotengine/godot/bin/godot.x11.tools.64.llvm(main+0x173) [0x2e06663] (/home/hugo/Documents/Git/godotengine/godot/platform/x11/godot_x11.cpp:55)
[20] /lib64/libc.so.6(__libc_start_main+0xd5) [0x7fd0dbdd7b75] (??:0)
[21] /home/hugo/Documents/Git/godotengine/godot/bin/godot.x11.tools.64.llvm(_start+0x2e) [0x2e0642e] (??:?)
-- END OF BACKTRACE --
================================================================

[akien-mga]

Thanks!