[question] demangleAll + regexp + "_Z"

[harsszegi]

Hi,

I have an issue with WASM loading in Angular. During WASM loading there are certain expected errors to happen (like around Errno handling). In Angular my callstack contains "_ZoneDelegate", which means that the binding code matches to it, because of the following function:

function demangleAll(text) {
var regex = /\b_Z[\w\d_]+/g;
return text.replace(regex, function(x) {
var y = demangle(x);
return x === y ? x : y + " [" + x + "]";
});
}

This has a disastrous effect as __cxa_demangle will not be found in my module and loading the WASM fails because of this:

assert(__cxa_demangle_func);

Any hint how to overcome this?
Thanks,

[sbc100]

It looks like that assert(__cxa_demangle_func) is wrapped in $if DEMANGLE_SUPPORT.. so the compiler seems to think that demangle support is enabled. Are you setting -sDEMANGLE_SUPPORT on the command line?

[harsszegi]

Yeah I’m setting this, because I’d like to have demangled names in exceptions coming from C++ land, though in this specific case the exception came from JS land. Although I have to state that I have no clue why it didn’t find the cxa_demangle symbol in the image (regardless that it wasn’t a c++ function that failed). I’ll try to see what is tge cxa_demangle signature in my wasm

[sbc100]

I created #18579 which should at least make it impossible for __cxa_demangle to be missing here.

[harsszegi]

Lame question. Doing wasm2wat on my file it states that cxa_demangle is within the WASM

(func $__cxa_demangle (type 8) (param i32 i32 i32 i32) (result i32)

However Module appears to be missing it runtime. How can that be?
Thanks,