Function demangle

src/ld.js:1439–1465

(func)

function demangle(func) {
  var hasLibcxxabi = !!Module['___cxa_demangle'];
  if (hasLibcxxabi) {
    try {
      var s = func.substr(1);
      var len = lengthBytesUTF8(s)+1;
      var buf = _malloc(len);
      stringToUTF8(s, buf, len);
      var status = _malloc(4);
      var ret = Module['___cxa_demangle'](buf, 0, 0, status);
      if (getValue(status, 'i32') === 0 && ret) {
        return Pointer_stringify(ret);
      }
      // otherwise, libcxxabi failed
    } catch(e) {
      // ignore problems here
    } finally {
      if (buf) _free(buf);
      if (status) _free(status);
      if (ret) _free(ret);
    }
    // failure when using libcxxabi, don't demangle
    return func;
  }
  Runtime.warnOnce('warning: build with  -s DEMANGLE_SUPPORT=1  to link in libcxxabi demangling');
  return func;
}

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