Nape with Neko

[Ali Hassan]

has anyone got nape to work with Neko  ? i was trying to use it in a project on linux .. but it didn't even compile ...
it just prints "Uncaught exception - std@module_read"

did I do something wrong here . or Is that a common problem ? ...

thanks you

[Waynetron]

I started a project with Nape and I think it worked with Neko.

I'll find the source code for you when I get home tonight.

[Waynetron]

So this was a Ludum Dare game that I started but scrapped. The code is a mess but I tested it in Neko and it works.

I've attached the entire project, perhaps it might help.

[Ali Hassan]

thanks for answering .. it works great ..

I think i just assumed it doesn't work .. because when i downloaded the flxNape demo it gave me the same error as well ..

I guess it might be something in the project.xml file ...

I will post the difference once I find it .

thanks again :D

[Gama11]

This is an old issue. The problem is that neko has a hardcoded limitation regarding the lines of byte code. Using two large libraries like HaxeFlixel + Nape can be enough to exceed that limit.

Neko's opcode limit has been increased quite a while ago already actually, but there hasn't been a haxe release including a new neko version so far. You could try installing a nightly build.

Defining no-inline sometimes helps, since that reduces the size of the generated byte code. That could have an impact on performance though.

<haxedef name="no-inline" />

On Saturday, May 16, 2015 at 6:33:47 PM UTC+2, Ali Hassan wrote:

thanks for answering .. it works great ..

i think i just assumed it doesn't work .. because when i downloaded the flxNape demo it gave me the same erros as well ..

i guess it might be something in the project.xml file ...

i will post the difference once i find it .

thanks again :D

[Ali Hassan]

I tried adding the line you proposed in project.XML .. but it didn't fix my problem though ..
the error message now changed to this ..
Segmentation fault (core dumped)

[Smiz Meal]

Ali, I was also running into problems getting my HaxeFlixel project to compile with the Neko target using Nape. I did resolve it, in a roundabout way...

First, I was getting the "Uncaught exception - std@module_read" error just like you, and after some searching decided to use these lines in my project.xml

    <haxedef name="NAPE_RELEASE_BUILD"/>
    <haxeflag name="-dce full" />
    <haxedef name="NAPE_NO_INLINE" if="neko" />

The first line forces it to use the release build of Nape (not always practical during debugging/development, but it supposedly gives better performance). The second line tells the haxe compiler to use full dead code elimination. The third line (which I found searching the internet) is apparently needed to undo the trouble that Nape's inline code causes with Neko.

I also updated my version of Neko to a nightly (windows) build. Even then I was still running into problems with zpp_nape code, this time producing the error:

Called from zpp_nape/callbacks/CbType.hx line 348
Called from nape/callbacks/CbType.hx line 179
Called from nape/callbacks/CbType.hx line 198
Called from zpp_nape/callbacks/CbType.hx line 174
Called from zpp_nape/callbacks/CbType.hx line 353
Called from zpp_nape/ID.hx line 186
Uncaught exception - Invalid operation (+)

 which is apparently caused by trying to increment a static variable "_CbType" that should be initialized to zero, but instead never gets initialized (possibly due to dead code elimination?). Anyway, I modified that part of ID.hx as so:

public static function CbType(){
        //return _CbType++;
        if(_CbType == null){
            _CbType = 0;
        }
        _CbType = _CbType + 1;
        return _CbType;
}

which finally got my HaxeFlixel project that uses Nape to compile to the Neko target. Honestly, this is a pretty bad hack but I needed to get back to developing, and Neko is good for quick compilations. Perhaps if others encounter the same issue it should get reported as to the Nape / Neko people.

[Ali Hassan]

sorry if that's a stupid question .. but how to setup a nightly build of neko on linux ?

[Gama11]

Good question, the readme isn't very helpful in that regard ("just build it from source"). I think you'll have to build it using the Makefile.