test_soft_failed_value_call_refund_through_child_halt()

Documentation for tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_call.py::test_soft_failed_value_call_refund_through_child_halt@26332146.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_call.py::test_soft_failed_value_call_refund_through_child_halt --fork Amsterdam

Verify a same-frame NEW_ACCOUNT charge-and-refund (a value CALL soft-failing the balance check) performed after a reverted child call, merged into a frame with its own spilled set that then exceptionally halts, charges the sender the halted frame's budget exactly once — pinned by the receipt.

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

@pytest.mark.valid_from("EIP8037")
def test_soft_failed_value_call_refund_through_child_halt(
    state_test: StateTestFiller,
    pre: Alloc,
    fork: Fork,
) -> None:
    """
    Verify a same-frame NEW_ACCOUNT charge-and-refund (a value CALL
    soft-failing the balance check) performed after a reverted child
    call, merged into a frame with its own spilled set that then
    exceptionally halts, charges the sender the halted frame's budget
    exactly once — pinned by the receipt.
    """
    intrinsic_cost = fork.transaction_intrinsic_cost_calculator()()
    sstore_state_gas = Op.SSTORE(new_value=1).state_cost(fork)
    child_budget = 600_000

    grandchild = pre.deploy_contract(code=Op.SSTORE(0, 1) + Op.REVERT(0, 0))
    fresh = pre.nonexistent_account()
    # Zero balance: the value CALL soft-fails its balance check after
    # the up-front NEW_ACCOUNT state charge, refunded in-frame.
    middle = pre.deploy_contract(
        code=(
            Op.POP(Op.CALL(gas=Op.GAS, address=grandchild))
            + Op.POP(Op.CALL(gas=Op.GAS, address=fresh, value=1))
            + Op.STOP
        ),
    )
    child = pre.deploy_contract(
        code=(
            Op.SSTORE(0, 1)
            + Op.POP(Op.CALL(gas=Op.GAS, address=middle))
            + Op.INVALID
        ),
    )

    storage = Storage()
    # The child call halts and returns 0, so the caller's first SSTORE
    # is a cold no-op (0 to 0) on a fresh slot rather than the cold set
    # `execution_cost` assumes by default.
    caller_code = Op.SSTORE.with_metadata(
        key_warm=False,
        original_value=0,
        current_value=0,
        new_value=0,
    )(
        storage.store_next(0, "child_halted"),
        Op.CALL(gas=child_budget, address=child),
    ) + Op.SSTORE(storage.store_next(1, "caller_completed"), 1)
    caller = pre.deploy_contract(code=caller_code)

    # The halted child consumes its whole forwarded budget as execution
    # gas; the caller's slot-1 set is the only surviving state charge.
    expected_cumulative = (
        intrinsic_cost
        + caller_code.execution_cost(fork)
        + child_budget
        + sstore_state_gas
    )

    tx = Transaction(
        to=caller,
        gas_limit=1_000_000,
        sender=pre.fund_eoa(),
        expected_receipt=TransactionReceipt(
            cumulative_gas_used=expected_cumulative,
        ),
    )

    post = {
        caller: Account(storage=storage),
        child: Account(storage={0: 0}),
        fresh: Account.NONEXISTENT,
    }
    state_test(pre=pre, post=post, tx=tx)

Parametrized Test Cases

This test generates 1 parametrized test case across 1 fork.