EVM Opcodes 102

address = keccak256( 0xff + sender_address + salt + keccak256(init_code))[12:]

def create2(self):
    if len(self.stack) < 4:
        raise Exception('Stack underflow')

    value = self.stack.pop()
    mem_offset = self.stack.pop()
    length = self.stack.pop()
    salt = self.stack.pop()

    # 扩展内存
    if len(self.memory) < mem_offset + length:
        self.memory.extend([0] * (mem_offset + length - len(self.memory)))

    # 获取初始化代码
    init_code = self.memory[mem_offset: mem_offset + length]

    # 检查创建者的余额是否足够
    creator_account = account_db[self.txn.thisAddr]
    if creator_account['balance'] < value:
        raise Exception('Insufficient balance to create contract!')

    # 为创建者扣除指定的金额
    creator_account['balance'] -= value

    # 生成新的合约地址（参考geth中的方式，使用盐和initcode的hash）
    init_code_hash = sha3.keccak_256(init_code).digest()
    data_to_hash = b'\xff' + self.txn.thisAddr.encode() + str(salt).encode() + init_code_hash
    new_contract_address_bytes = sha3.keccak_256(data_to_hash).digest()
    new_contract_address = '0x' + new_contract_address_bytes[-20:].hex()  # 取后20字节作为地址

    # 使用txn构建上下文并执行
    ctx = Transaction(to=new_contract_address,
                        data=init_code,
                        value=value,
                        caller=self.txn.thisAddr,
                        origin=self.txn.origin,
                        thisAddr=new_contract_address,
                        gasPrice=self.txn.gasPrice,
                        gasLimit=self.txn.gasLimit)
    evm_create2 = EVM(init_code, ctx)
    evm_create2.run()

    # 如果EVM实例返回错误，压入0，表示创建失败
    if evm_create2.success == False:
        self.stack.append(0)
        return

    # 更新创建者的nonce
    creator_account['nonce'] += 1

    # 存储合约的状态
    account_db[new_contract_address] = {
        'balance': value,
        'nonce': 0,
        'storage': evm_create2.storage,
        'code': evm_create2.returnData
    }

    # 压入新创建的合约地址
    self.stack.append(int(new_contract_address, 16))