List to String for Flash target

[Jean-Baptiste Richardet]

Hi,

I found some weird error today. I created a list of anonymous object (previously typedef):

var selection = new List<Input>();

I added some elements to this list, and then I wanted to trace it:

trace(selection);
// I try this too
trace(selection.toString());

Then, I got an execution error with a huge stacktrace

[Fault] exception, information=undefined
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:164]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:196]
at flash::Boot$/__string_rec()[/usr/lib/haxe/std/flash/Boot.hx:178]

Where does it come from? Is it because my anonymous object?

Thanks,

Jean-Baptiste

[ron...@gmail.com]

dce ?

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[Jean-Baptiste Richardet]

Actually, I'm using OpenFL, but my xml file doesn't mention any DCE. And the generated HXML doesn't have the DCE flag.

I assume I'm using the default.

[da...@postite.com]

Default is dce full
Add haxeflag with dce:no in your project.xml

--

[David Holaň]

Long long ago in times of haxe 2, i noticed that toString() method of an anonymous object recursively calls toString() for each property and that it blows up if there is a circular reference. Dunno if anything has changed.

-David Holaň

[Jean-Baptiste Richardet]

Looks like it didn't change, David. Even with the flag <haxeflag name="-dce" value="no" />, the error's here.
I looked into it step by step, and that's actually the Std.string() on list element that goes into an infinite Boot.__string_rec() hell loop.

Should I abandon displaying anonymous object as String ?

[ron...@gmail.com]

strange !

perhaps you could try to rebind toString 

like this

http://try.haxe.org/#48Af3

ps: i really don't know what i am doing :)

[Cambiata]

...i noticed that toString() method of an anonymous object recursively calls toString() for each property and that it blows up if there is a circular reference. Dunno if anything has changed.

Yep, that has happened for me too, in Haxe 3.

Jean-Baptiste, does it work if you instead try
 trace(Std.string(selection);
?

[Jean-Baptiste Richardet]

Nope, same error with

trace(Std.string(selection));

[Jean-Baptiste Richardet]

I created a more precise example: http://try.haxe.org/#93bd3
I think the problem comes from the cross reference between Input and Group. Any workaround ?

[Juraj Kirchheim]

This has nothing to do with DCE or the like. Std.string in flash just
doesn't guard against deep recursion.

Here is how JS implements it:
https://github.com/HaxeFoundation/haxe/blob/development/std/js/Boot.hx#L82
Here's the flash version, that does no indenting or depth capping:
https://github.com/HaxeFoundation/haxe/blob/development/std/flash/Boot.hx#L163

I would call this a bug, despite the fact that Haxe gives no real
guarantees about how this should behave.

Best,
Juraj