Thanks for the reply.
I organized a hackathon and made pretty good progress on solving my task —
I replaced Emscripten’s socket implementation with my own and managed to
get through the initial handshake stage when connecting the client to the
server.
However, unfortunately, at some point an exception occurs on the server and
it crashes.
As the mentioned, exception catching is disabled, so I only see a very
uninformative message:
Exception catching is disabled, this exception cannot be caught. C...
I did some digging and found that the UT99 engine throws exceptions like
this:
throw (TEXT("SOME TEXT"))
I don’t yet know exactly what TEXT does, but let’s assume it’s equivalent
to:
throw "Some text"
My question is: is there any way I can print this "Some text" to console.log
?
I tried debugging directly in WASM to find the pointer to "Some text", but
haven’t succeeded yet.
Here’s the _cxa_throw implementation:
function ___cxa_throw(ptr, type, destructor) {
EXCEPTIONS.infos[ptr] = {
ptr: ptr,
adjusted: ptr,
type: type,
destructor: destructor,
refcount: 0,
caught: false,
rethrown: false
};
EXCEPTIONS.last = ptr;
if (!("uncaught_exception" in __ZSt18uncaught_exceptionv)) {
__ZSt18uncaught_exceptionv.uncaught_exception = 1
} else {
__ZSt18uncaught_exceptionv.uncaught_exception++
}
debugger
console.warn("___cxa_throw", ptr, type, destructor);
// throw ptr - " - Exception catching is disabled, this exception
cannot be caught. Compile with -s DISABLE_EXCEPTION_CATCHING=0 or
DISABLE_EXCEPTION_CATCHING=2 to catch."
}
чт, 16 окт. 2025 г. в 16:20, 'Sam Clegg' via emscripten-discuss <
[email protected]>:
>
>
> On Wed, Oct 15, 2025 at 2:13 PM Александр Гурьянов <[email protected]>
> wrote:
>
>> Hi guys, I think you know there’s a browser port of *Unreal Tournament*
>> made by *Ryan C. Gordon*. It works almost perfectly, but the *networking
>> doesn’t*.
>>
>> I’m currently actively working on a *classic networked games project* —
>> right now it’s already possible to play *HLDM, Quake 2/3, DOOM, and
>> OpenTTD* in the browser. Naturally, I’d love to have *UT99* in my
>> collection as well.
>>
>> I’ve spoken with Ryan — unfortunately, he can’t provide the source code
>> since he doesn’t have the rights to it. So I have to work with what’s
>> available, namely the *compiled WASM*.
>>
>> I suspect the game crashes when starting a network session because it *tries
>> to open a port*, which obviously isn’t possible in the browser. My plan
>> is to *intercept and replace the necessary WASM calls* with my own
>> networking layer.
>>
>> The worst part is that the only available build is *fully obfuscated*
>> and most likely *compiled without exceptions*, so the crash stacks are
>> extremely uninformative. Still, I plan to gradually analyze the WASM and
>> *reconstruct
>> some of the networking logic*. It seems a good place to start is by
>> analyzing *the Emscripten JS glue functions* — when and how they’re
>> invoked.
>>
>> Now to my main question:
>> 👉 *Is there any way to determine exactly which version of Emscripten
>> this binary was built with?*
>> Ideally down to a commit hash — or at least the major/minor version. That
>> would be a great starting point, since I could then review the
>> corresponding network stack implementation.
>>
>
> Unfortunately (for you) there is no such thing, no. For debug builds I
> think it's quite easy but it's an explicit non-goal of emscripten to embed
> any of watermark or version information in release binaries.
>
>
>> *P.S.* It would’ve been logical to just ask Ryan which version he used,
>> but unfortunately, for some reason (I’m not sure why), he stopped replying.
>>
>> *P.S.2.* This is a port https://icculus.org/ut99-emscripten/
>>
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