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test_sstore_combinations_initial()

Documentation for tests/istanbul/eip2200_net_gas_metering/test_sstore_combinations.py::test_sstore_combinations_initial@26332146.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/istanbul/eip2200_net_gas_metering/test_sstore_combinations.py::test_sstore_combinations_initial --fork Amsterdam

Test SSTORE with four interleaved calls.

Exercises every combination of call types across four call slots, varying the update-contract's initial storage state (0, 1, or 2). Valid from Byzantium (REVERT and STATICCALL availability) so the pre-EIP-2200 storage gas rules are covered as a baseline. Consolidated replacement for the twelve legacy sstore_combinations_initial*_ParisFiller.json fillers from state_tests/stTimeConsuming/.

Source code in tests/istanbul/eip2200_net_gas_metering/test_sstore_combinations.py 
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@pytest.mark.parametrize("initial", range(3))
@pytest.mark.parametrize("call_4, call_4_target", MIDDLE_ACTIONS)
@pytest.mark.parametrize("call_3", [Op.CALL, Op.DELEGATECALL])
@pytest.mark.parametrize("call_2, call_2_target", MIDDLE_ACTIONS)
@pytest.mark.parametrize("call_1", [Op.CALL, Op.DELEGATECALL])
def test_sstore_combinations_initial(
    state_test: StateTestFiller,
    pre: Alloc,
    fork: Fork,
    initial: int,
    call_1: Op,
    call_2: Op,
    call_2_target: MidContractActions,
    call_3: Op,
    call_4: Op,
    call_4_target: MidContractActions,
) -> None:
    """
    Test SSTORE with four interleaved calls.

    Exercises every combination of call types across four call slots,
    varying the update-contract's initial storage state (0, 1, or 2).
    Valid from Byzantium (REVERT and STATICCALL availability) so the
    pre-EIP-2200 storage gas rules are covered as a baseline.
    Consolidated replacement for the twelve legacy
    ``sstore_combinations_initial*_ParisFiller.json`` fillers from
    ``state_tests/stTimeConsuming/``.
    """
    sender = pre.fund_eoa()

    def deploy_side(kind: MidContractActions) -> Address:
        if kind == MidContractActions.NOOP:
            return pre.deploy_contract(Bytecode())
        if kind == MidContractActions.SSTORE_TOGGLE:
            return pre.deploy_contract(code=SSTORE_TOGGLE_CODE)
        return pre.deploy_contract(
            code=Op.REVERT(offset=0x0, size=0x20) + Op.STOP,
        )

    side = {
        kind: deploy_side(kind)
        for kind in MidContractActions
        if kind
        in {call_2_target, call_4_target, MidContractActions.SSTORE_TOGGLE}
    }

    update_contract = pre.deploy_contract(
        code=UPDATE_CONTRACT_CODE,
        storage={0: initial, 1: initial, 2: initial} if initial > 0 else {},
    )
    sstore_toggle = side[MidContractActions.SSTORE_TOGGLE]

    call_gas = SSTORE_TOGGLE_CODE.gas_cost(fork)

    initcode = (
        Op.MSTORE(offset=0x64, value=0x0)
        + Op.POP(
            call_1(
                gas=call_gas,
                address=update_contract,
                args_size=0x20,
            )
        )
        + Op.POP(call_2(gas=call_gas, address=side[call_2_target]))
        + Op.POP(
            call_3(
                gas=call_gas,
                address=update_contract,
                args_size=0x20,
            )
        )
        + Op.POP(call_4(gas=call_gas, address=side[call_4_target]))
        + Op.CALL(gas=call_gas, address=sstore_toggle)
        + Op.STOP
    )

    tx = Transaction(
        sender=sender,
        to=None,
        data=initcode,
        value=1,
        protected=fork.supports_protected_txs(),
    )

    post = {
        sstore_toggle: Account(storage={1: 1}),
        compute_create_address(address=sender, nonce=0): Account(nonce=1),
    }

    state_test(pre=pre, post=post, tx=tx)

Parametrized Test Cases

This test generates 768 parametrized test cases across 12 forks.