test_swapn_jump_to_valid_immediate_fails()

Documentation for tests/amsterdam/eip8024_dupn_swapn_exchange/test_swapn.py::test_swapn_jump_to_valid_immediate_fails@622620d8.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip8024_dupn_swapn_exchange/test_swapn.py::test_swapn_jump_to_valid_immediate_fails --fork Amsterdam

Test jumping to a valid immediate byte fails.

Bytecode: PUSH1(4) JUMP SWAPN[0x00] Hex: 6004 56 e7 00 Position 4 contains 0x00 which is a VALID immediate for SWAPN. JUMPDEST analysis is unchanged by EIP-8024: position 4 holds 0x00, not 0x5b, so it is not a valid jump target and the jump fails.

Source code in tests/amsterdam/eip8024_dupn_swapn_exchange/test_swapn.py

@EIPChecklist.Opcode.Test.DataPortion.Jump()
def test_swapn_jump_to_valid_immediate_fails(
    pre: Alloc,
    state_test: StateTestFiller,
) -> None:
    """
    Test jumping to a valid immediate byte fails.

    Bytecode: PUSH1(4) JUMP SWAPN[0x00]
    Hex: 6004 56 e7 00
    Position 4 contains 0x00 which is a VALID immediate for SWAPN.
    JUMPDEST analysis is unchanged by EIP-8024: position 4 holds 0x00,
    not 0x5b, so it is not a valid jump target and the jump fails.
    """
    sender = pre.fund_eoa()

    # Build code that tries to jump to a valid immediate
    code = Bytecode()
    code += Op.PUSH1(4)  # Push jump target (position 4)
    code += Op.JUMP  # Try to jump to position 4
    # Pass as bytes (raw immediate byte for testing)
    code += Op.SWAPN[b"\x00"]  # Position 3-4: SWAPN + 0x00 (valid)

    # This should never execute
    code += Op.PUSH1(0x42) + Op.PUSH1(0) + Op.SSTORE
    code += Op.STOP

    contract_address = pre.deploy_contract(code=code)

    tx = Transaction(to=contract_address, sender=sender)

    # Transaction fails - position 4 is a valid immediate, not JUMPDEST
    post = {contract_address: Account(storage={})}

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

Parametrized Test Cases

This test generates 1 parametrized test case across 1 fork.