Test Mcopy Contexts

Documentation for tests/cancun/eip5656_mcopy/test_mcopy_contexts.py.

Generate fixtures for these test cases for Cancun with:

Cancun only:

fill -v tests/cancun/eip5656_mcopy/test_mcopy_contexts.py --fork=Cancun --evm-bin=/path/to/evm-tool-dev-version

For all forks up to and including Cancun:

fill -v tests/cancun/eip5656_mcopy/test_mcopy_contexts.py --until=Cancun --evm-bin=/path/to/evm-tool-dev-version

abstract: Tests EIP-5656: MCOPY - Memory copying instruction

Test memory copy under different call contexts [EIP-5656: MCOPY - Memory copying instruction](https://eips.ethereum.org/EIPS/eip-5656)

test_no_memory_corruption_on_upper_call_stack_levels(state_test, pre, post, tx)

Perform a subcall with any of the following opcodes, which uses MCOPY during its execution, and verify that the caller's memory is unaffected: - CALL - CALLCODE - DELEGATECALL - STATICCALL - CREATE - CREATE2

Source code in tests/cancun/eip5656_mcopy/test_mcopy_contexts.py

@pytest.mark.parametrize(
    "opcode",
    [
        Op.CALL,
        Op.DELEGATECALL,
        Op.STATICCALL,
        Op.CALLCODE,
        Op.CREATE,
        Op.CREATE2,
    ],
)
@pytest.mark.valid_from("Cancun")
def test_no_memory_corruption_on_upper_call_stack_levels(
    state_test: StateTestFiller,
    pre: Mapping[str, Account],
    post: Mapping[str, Account],
    tx: Transaction,
):
    """
    Perform a subcall with any of the following opcodes, which uses MCOPY during its execution,
    and verify that the caller's memory is unaffected:
      - `CALL`
      - `CALLCODE`
      - `DELEGATECALL`
      - `STATICCALL`
      - `CREATE`
      - `CREATE2`
    """
    state_test(
        env=Environment(),
        pre=pre,
        post=post,
        txs=[tx],
    )