Method constructor

g2all/700/module/chain.js:175–194

(stack_size = 0x1000, upper_pad = 0x10000)

//   upper_pad: the amount of extra space above stack
export class ChainBase {
  constructor(stack_size = 0x1000, upper_pad = 0x10000) {
    this._is_dirty = false;
    this.position = 0;

    const return_value = new Uint32Array(4);
    this._return_value = return_value;
    this.retval_addr = get_view_vector(return_value);

    const errno = new Uint32Array(1);
    this._errno = errno;
    this.errno_addr = get_view_vector(errno);

    const full_stack_size = upper_pad + stack_size;
    const stack_buffer = new ArrayBuffer(full_stack_size);
    const stack = new DataView(stack_buffer, upper_pad);
    this.stack = stack;
    this.stack_addr = get_view_vector(stack);
    this.stack_size = stack_size;
    this.full_stack_size = full_stack_size;
  }

  // use this if you want to write a new ROP chain but don't want to allocate
  // a new instance