test_sstore_restoration_cross_frame()

Documentation for tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_sstore.py::test_sstore_restoration_cross_frame@c74f1a67.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_sstore.py::test_sstore_restoration_cross_frame --fork Amsterdam

Verify restoration refund across frames for CALL / CALLCODE / DELEGATECALL.

Callee performs the full 0 to x to 0 cycle within its call. For CALL the slot lives in callee's storage; for CALLCODE/DELEGATECALL it lives in caller's. The reservoir is tx-level, so the refund applies regardless of storage ownership. Net block state gas is zero.

Source code in tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_sstore.py

@pytest.mark.with_all_call_opcodes(
    selector=lambda call_opcode: call_opcode != Op.STATICCALL
)
@pytest.mark.valid_from("EIP8037")
def test_sstore_restoration_cross_frame(
    blockchain_test: BlockchainTestFiller,
    pre: Alloc,
    fork: Fork,
    call_opcode: Op,
) -> None:
    """
    Verify restoration refund across frames for CALL / CALLCODE / DELEGATECALL.

    Callee performs the full 0 to x to 0 cycle within its call. For
    CALL the slot lives in callee's storage; for CALLCODE/DELEGATECALL
    it lives in caller's.  The reservoir is tx-level, so the refund
    applies regardless of storage ownership.  Net block state gas is
    zero.
    """
    sstore_state_gas = Op.SSTORE(new_value=1).state_cost(fork)
    intrinsic_gas = fork.transaction_intrinsic_cost_calculator()()

    child_code = (
        Op.SSTORE(0, 1)
        + Op.SSTORE.with_metadata(
            key_warm=True,
            original_value=0,
            current_value=1,
            new_value=0,
        )(0, 0)
        + Op.STOP
    )
    # Callee's regular gas excludes the state gas (refunded at x to 0).
    child_regular = child_code.gas_cost(fork) - sstore_state_gas
    child = pre.deploy_contract(code=child_code)

    parent_code = Op.POP(call_opcode(gas=child_regular, address=child))
    parent = pre.deploy_contract(code=parent_code)

    tx_regular = intrinsic_gas + parent_code.gas_cost(fork) + child_regular

    tx = Transaction(
        to=parent,
        state_gas_reservoir=sstore_state_gas,
        sender=pre.fund_eoa(),
    )

    # CALL targets callee's storage; CALLCODE/DELEGATECALL target caller's.
    slot_owner = child if call_opcode == Op.CALL else parent
    blockchain_test(
        pre=pre,
        blocks=[Block(txs=[tx], header_verify=Header(gas_used=tx_regular))],
        post={slot_owner: Account(storage={0: 0})},
    )

Parametrized Test Cases

This test generates 3 parametrized test cases across 1 fork.