test_factory_in_caller_context()

Documentation for tests/amsterdam/eip7997_deterministic_factory_predeploy/test_factory.py::test_factory_in_caller_context@5c024cbb.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip7997_deterministic_factory_predeploy/test_factory.py::test_factory_in_caller_context --fork Amsterdam

Under DELEGATECALL or CALLCODE, the factory's bytecode runs in the caller's context, so CREATE2's deployer is the caller — not the factory. The contract is deployed at the address derived from the caller, and the factory-derived address is empty.

Source code in tests/amsterdam/eip7997_deterministic_factory_predeploy/test_factory.py

@pytest.mark.parametrize("call_opcode", [Op.DELEGATECALL, Op.CALLCODE])
def test_factory_in_caller_context(
    state_test: StateTestFiller,
    pre: Alloc,
    call_opcode: Op,
) -> None:
    """
    Under `DELEGATECALL` or `CALLCODE`, the factory's bytecode runs in the
    caller's context, so `CREATE2`'s deployer is the caller — not the
    factory. The contract is deployed at the address derived from the
    caller, and the factory-derived address is empty.
    """
    salt = 0x44
    runtime_code = Op.STOP
    initcode = Initcode(deploy_code=runtime_code)
    factory_derived = compute_create2_address(FACTORY, salt, initcode)

    call_op = call_opcode(
        gas=Op.GAS,
        address=FACTORY,
        args_offset=0,
        args_size=Op.CALLDATASIZE,
        ret_offset=0x10C,
        ret_size=20,
    )

    storage = Storage()
    call_success_slot = storage.store_next(1, "delegated_call_success")
    derived_addr_slot = storage.store_next(0, "caller_derived_address")

    caller = pre.deploy_contract(
        Op.CALLDATACOPY(0, 0, Op.CALLDATASIZE)
        + Op.SSTORE(call_success_slot, call_op)
        + Op.SSTORE(derived_addr_slot, Op.MLOAD(0x100))
        + Op.STOP,
    )
    caller_derived = compute_create2_address(caller, salt, initcode)
    storage[derived_addr_slot] = caller_derived

    state_test(
        pre=pre,
        tx=Transaction(
            sender=pre.fund_eoa(),
            to=caller,
            data=Hash(salt) + bytes(initcode),
        ),
        post={
            caller: Account(storage=storage),
            caller_derived: Account(nonce=1, code=bytes(runtime_code)),
            factory_derived: Account.NONEXISTENT,
        },
    )

Parametrized Test Cases

This test generates 2 parametrized test cases across 1 fork.