neBreak);
      line = line.slice(lineBreak + 1);
      return res;
    }
    const bytes = fs.readSync(fd, buf, 0, buf.length);
    line += dec.write(buf.slice(0, bytes));
    if (line.length === 0) {
      return '';
    }
    if (bytes === 0) {
      process.emitWarning(`Profile file ${logFile} is broken`, {
        code: 'BROKEN_PROFILE_FILE',
        detail: `${JSON.stringify(line)} at the file end is broken`
      });
      return '';
    }
  }
}

function versionCheck(firstLine, expected) {
  // v8-version looks like
  // "v8-version,$major,$minor,$build,$patch[,$embedder],$candidate"
  // whereas process.versions.v8 is either "$major.$minor.$build-$embedder" or
  // "$major.$minor.$build.$patch-$embedder".
  firstLine = firstLine.split(',');
  const curVer = expected.split(/[.-]/);
  if ((firstLine.length !== 6 && firstLine.length !== 7) ||
      firstLine[0] !== 'v8-version') {
    return 'Unable to read v8-version from log file.';
  }
  // Compare major, minor and build; ignore the patch and candidate fields.
  for (let i = 0; i < 3; i++)
    if (curVer[i] !== firstLine[i + 1])
      return 'Testing v8 version different from logging version';
}

function macCppfiltNm(out) {
  // Re-grouped copy-paste from `tickprocessor.js`
  const FUNC_RE = /^([0-9a-fA-F]{8,16} [iItT] )(.*)$/gm;
  const CLEAN_RE = /^[0-9a-fA-F]{8,16} [iItT] /;
  let entries = out.match(FUNC_RE);
  if (entries === null)
    return out;

  entries = entries.map((entry) => entry.replace(CLEAN_RE, ''));

  let filtered;
  try {
    filtered = cp.spawnSync('c++filt', [ '-p', '-i' ], {
      input: entries.join('\n')
    }).stdout.toString();
  } catch {
    return out;
  }

  let i = 0;
  filtered = filtered.split('\n');
  return out.replace(FUNC_RE, (all, prefix, postfix) => {
    return prefix + (filtered[i++] || postfix);
  });
}

Object.assign(globalThis, {
  os,
  print,
  read,
  quit,
  readline,
});