embind __embind_register_std_string error when memory64

[TianPeilong]

Please include the following in your bug report:

Version of emscripten/emsdk:
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 4.0.3 (a9651ff)
Copyright (C) 2014 the Emscripten authors (see AUTHORS.txt)
This is free and open source software under the MIT license.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Failing command line in full:
When using memory64 in Embind, in the __embind_register_std_string function generated by Embind, the line var length = HEAPU64[((value)/8)]; will encounter an error because value is of BigInt type. The operation bigint/8 throws an error: Error: Cannot mix BigInt and other types, use explicit conversions.

  function __embind_register_std_string(rawType, name) {
    rawType = bigintToI53Checked(rawType);
    name = bigintToI53Checked(name);
  
    
      name = readLatin1String(name);
      var stdStringIsUTF8
      = true;
  
      registerType(rawType, {
        name,
        // For some method names we use string keys here since they are part of
        // the public/external API and/or used by the runtime-generated code.
        'fromWireType'(value) {
          var length = HEAPU64[((value)/8)];
          var payload = value + 8;

[brendandahl]

I'm unable to reproduce. With memory64 the call should go through a dyncaller that will automatically convert the BigInt to a number. What flags are you compiling with?

My test:

emcc -sMEMORY64 -g -lembind main.cpp -o a.out.html

#include <stdio.h>
#include <emscripten.h>
#include <emscripten/bind.h>

using namespace emscripten;

std::string foo() {
  return "hello";
}

int main() {

  EM_ASM(
    console.log(Module.foo());
  );
}

EMSCRIPTEN_BINDINGS(xxx) {
  function("foo", &foo);
}