Function wasmSignedLeb64

deps/v8/test/mjsunit/wasm/wasm-module-builder.js:2418–2439

(val, max_len = 10)

}

function wasmSignedLeb64(val, max_len = 10) {
  if (val == null) throw new Error("Leb value may not be null/undefined");
  if (typeof val != "bigint") {
    if (val < Math.pow(2, 31)) {
      return wasmSignedLeb(val, max_len);
    }
    val = BigInt(val);
  }
  let res = [];
  for (let i = 0; i < max_len; ++i) {
    let v = val & 0x7fn;
    // If {v} sign-extended from 7 to 32 bits is equal to val, we are done.
    if (BigInt.asIntN(7, v) == val) {
      res.push(Number(v));
      return res;
    }
    res.push(Number(v) | 0x80);
    val = val >> 7n;
  }
  throw new Error(
      'Leb value <' + val + '> exceeds maximum length of ' + max_len);
}

function wasmUnsignedLeb(val, max_len = 5) {
  if (val == null) throw new Error("Leb value many not be null/undefined");