Ethereum Test Forks package

Ethereum test fork definitions.

BPO1

Bases: Osaka

Mainnet BPO1 fork - Blob Parameter Only fork 1.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class BPO1(
    Osaka,
    bpo_fork=True,
    update_blob_constants={
        "BLOB_BASE_FEE_UPDATE_FRACTION": 8346193,
        "TARGET_BLOBS_PER_BLOCK": 10,
        "MAX_BLOBS_PER_BLOCK": 15,
    },
):
    """Mainnet BPO1 fork - Blob Parameter Only fork 1."""

    pass

BPO2

Bases: BPO1

Mainnet BPO2 fork - Blob Parameter Only fork 2.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class BPO2(
    BPO1,
    bpo_fork=True,
    update_blob_constants={
        "BLOB_BASE_FEE_UPDATE_FRACTION": 11684671,
        "TARGET_BLOBS_PER_BLOCK": 14,
        "MAX_BLOBS_PER_BLOCK": 21,
    },
):
    """Mainnet BPO2 fork - Blob Parameter Only fork 2."""

    pass

BPO3

Bases: BPO2

Pseudo BPO3 fork - Blob Parameter Only fork 3. For testing purposes only.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class BPO3(
    BPO2,
    bpo_fork=True,
    deployed=False,
    update_blob_constants={
        "BLOB_BASE_FEE_UPDATE_FRACTION": 20609697,
        "TARGET_BLOBS_PER_BLOCK": 21,
        "MAX_BLOBS_PER_BLOCK": 32,
    },
):
    """
    Pseudo BPO3 fork - Blob Parameter Only fork 3.
    For testing purposes only.
    """

    pass

BPO4

Bases: BPO3

Pseudo BPO4 fork - Blob Parameter Only fork 4. For testing purposes only. Testing a decrease in values from BPO3.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class BPO4(
    BPO3,
    bpo_fork=True,
    update_blob_constants={
        "BLOB_BASE_FEE_UPDATE_FRACTION": 13739630,
        "TARGET_BLOBS_PER_BLOCK": 14,
        "MAX_BLOBS_PER_BLOCK": 21,
    },
):
    """
    Pseudo BPO4 fork - Blob Parameter Only fork 4.
    For testing purposes only. Testing a decrease in values from BPO3.
    """

    pass

BPO5

Bases: BPO4

Pseudo BPO5 fork - Blob Parameter Only fork 5. For testing purposes only. Required to parse Fusaka devnet genesis files.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class BPO5(
    BPO4,
    bpo_fork=True,
):
    """
    Pseudo BPO5 fork - Blob Parameter Only fork 5.
    For testing purposes only. Required to parse Fusaka devnet genesis files.
    """

    pass

Amsterdam

Bases: AmsterdamEIPs, BPO2

Amsterdam fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class Amsterdam(
    AmsterdamEIPs,
    BPO2,
    deployed=False,
):
    """Amsterdam fork."""

    # TODO: We may need to adjust which BPO Amsterdam inherits from as the
    #  related Amsterdam specs change over time, and before Amsterdam is
    #  live on mainnet.

    pass

ArrowGlacier

Bases: London

Arrow Glacier fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class ArrowGlacier(
    London,
    solc_name="london",
    ignore=True,
):
    """Arrow Glacier fork."""

    pass

Berlin

Bases: EIP2930, Istanbul

Berlin fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class Berlin(
    eips.EIP2930,
    Istanbul,
):
    """Berlin fork."""

    pass

Byzantium

Bases: EIP649, EIP214, EIP211, EIP140, EIP198, EIP196, EIP197, SpuriousDragon

Byzantium fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class Byzantium(
    eips.EIP649,
    eips.EIP214,
    eips.EIP211,
    eips.EIP140,
    eips.EIP198,
    eips.EIP196,
    eips.EIP197,
    SpuriousDragon,
):
    """Byzantium fork."""

    pass

Cancun

Bases: EIP5656, EIP1153, EIP4788, EIP4844, EIP7516, EIP6780, Shanghai

Cancun fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class Cancun(
    eips.EIP5656,
    eips.EIP1153,
    eips.EIP4788,
    eips.EIP4844,
    eips.EIP7516,
    eips.EIP6780,
    Shanghai,
):
    """Cancun fork."""

    pass

Constantinople

Bases: EIP1234, EIP1052, EIP1014, EIP145, Byzantium

Constantinople fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class Constantinople(
    eips.EIP1234,
    eips.EIP1052,
    eips.EIP1014,
    eips.EIP145,
    Byzantium,
):
    """Constantinople fork."""

    pass

ConstantinopleFix

Bases: Constantinople

Constantinople Fix fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class ConstantinopleFix(
    Constantinople,
    solc_name="constantinople",
    ruleset_name="PETERSBURG",
):
    """Constantinople Fix fork."""

    pass

Frontier

Bases: BaseFork

Frontier fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class Frontier(
    BaseFork,
    solc_name="homestead",
):
    """Frontier fork."""

    @classmethod
    def transition_tool_name(cls) -> str:
        """
        Return fork name as it's meant to be passed to the transition tool for
        execution.
        """
        if cls._transition_tool_name is not None:
            return cls._transition_tool_name
        return cls.name()

    @classmethod
    def solc_name(cls) -> str:
        """Return fork name as it's meant to be passed to the solc compiler."""
        if cls._solc_name is not None:
            return cls._solc_name
        return cls.name().lower()

    @classmethod
    def header_base_fee_required(cls) -> bool:
        """At genesis, header must not contain base fee."""
        return False

    @classmethod
    def header_prev_randao_required(cls) -> bool:
        """At genesis, header must not contain Prev Randao value."""
        return False

    @classmethod
    def header_zero_difficulty_required(cls) -> bool:
        """At genesis, header must not have difficulty zero."""
        return False

    @classmethod
    def header_withdrawals_required(cls) -> bool:
        """At genesis, header must not contain withdrawals."""
        return False

    @classmethod
    def header_excess_blob_gas_required(cls) -> bool:
        """At genesis, header must not contain excess blob gas."""
        return False

    @classmethod
    def header_blob_gas_used_required(cls) -> bool:
        """At genesis, header must not contain blob gas used."""
        return False

    @classmethod
    def gas_costs(cls) -> GasCosts:
        """
        Return dataclass with the defined gas costs constants for genesis.
        """
        return GasCosts(
            # Tiers
            BASE=BASE,
            VERY_LOW=VERY_LOW,
            LOW=LOW,
            MID=MID,
            HIGH=HIGH,
            # Access
            WARM_ACCESS=100,
            COLD_ACCOUNT_ACCESS=2_600,
            WARM_SLOAD=100,
            COLD_STORAGE_ACCESS=2_100,
            # Storage
            STORAGE_SET=20_000,
            COLD_STORAGE_WRITE=5_000,
            STORAGE_RESET=2_900,
            # Call
            CALL_VALUE=9_000,
            CALL_STIPEND=2_300,
            NEW_ACCOUNT=25_000,
            # Contract Creation
            CODE_DEPOSIT_PER_BYTE=200,
            CODE_INIT_PER_WORD=2,
            # Authorization
            AUTH_PER_EMPTY_ACCOUNT=0,
            # Utility
            MEMORY_PER_WORD=3,
            # Transactions
            TX_BASE=21_000,
            TX_ACCESS_LIST_ADDRESS=2_400,
            TX_ACCESS_LIST_STORAGE_KEY=1_900,
            TX_DATA_PER_ZERO=4,
            TX_DATA_PER_NON_ZERO=68,
            TX_CREATE=32_000,
            # Refunds
            REFUND_STORAGE_CLEAR=4_800,
            REFUND_AUTH_PER_EXISTING_ACCOUNT=0,
            # Precompiles
            PRECOMPILE_ECRECOVER=3_000,
            PRECOMPILE_SHA256_BASE=60,
            PRECOMPILE_SHA256_PER_WORD=12,
            PRECOMPILE_RIPEMD160_BASE=600,
            PRECOMPILE_RIPEMD160_PER_WORD=120,
            PRECOMPILE_IDENTITY_BASE=15,
            PRECOMPILE_IDENTITY_PER_WORD=3,
            # Static Opcodes
            OPCODE_ADD=VERY_LOW,
            OPCODE_SUB=VERY_LOW,
            OPCODE_MUL=LOW,
            OPCODE_DIV=LOW,
            OPCODE_SDIV=LOW,
            OPCODE_MOD=LOW,
            OPCODE_SMOD=LOW,
            OPCODE_ADDMOD=MID,
            OPCODE_MULMOD=MID,
            OPCODE_SIGNEXTEND=LOW,
            OPCODE_LT=VERY_LOW,
            OPCODE_GT=VERY_LOW,
            OPCODE_SLT=VERY_LOW,
            OPCODE_SGT=VERY_LOW,
            OPCODE_EQ=VERY_LOW,
            OPCODE_ISZERO=VERY_LOW,
            OPCODE_AND=VERY_LOW,
            OPCODE_OR=VERY_LOW,
            OPCODE_XOR=VERY_LOW,
            OPCODE_NOT=VERY_LOW,
            OPCODE_BYTE=VERY_LOW,
            OPCODE_JUMP=MID,
            OPCODE_JUMPI=HIGH,
            OPCODE_JUMPDEST=1,
            OPCODE_CALLDATALOAD=VERY_LOW,
            OPCODE_BLOCKHASH=20,
            OPCODE_COINBASE=BASE,
            OPCODE_PUSH=VERY_LOW,
            OPCODE_DUP=VERY_LOW,
            OPCODE_SWAP=VERY_LOW,
            # Dynamic Opcode Components
            OPCODE_CALLDATACOPY_BASE=VERY_LOW,
            OPCODE_CODECOPY_BASE=VERY_LOW,
            OPCODE_MLOAD_BASE=VERY_LOW,
            OPCODE_MSTORE_BASE=VERY_LOW,
            OPCODE_MSTORE8_BASE=VERY_LOW,
            OPCODE_SELFDESTRUCT_BASE=5_000,
            OPCODE_COPY_PER_WORD=3,
            OPCODE_CREATE_BASE=32_000,
            OPCODE_EXP_BASE=10,
            OPCODE_EXP_PER_BYTE=50,
            OPCODE_LOG_BASE=375,
            OPCODE_LOG_DATA_PER_BYTE=8,
            OPCODE_LOG_TOPIC=375,
            OPCODE_KECCAK256_BASE=30,
            OPCODE_KECCACK256_PER_WORD=6,
            # Zero-initialized: introduced in later forks, set via
            # replace() in the fork that activates them.
            TX_DATA_TOKEN_STANDARD=0,
            TX_DATA_TOKEN_FLOOR=0,
            PRECOMPILE_ECADD=0,
            PRECOMPILE_ECMUL=0,
            PRECOMPILE_ECPAIRING_BASE=0,
            PRECOMPILE_ECPAIRING_PER_POINT=0,
            PRECOMPILE_BLAKE2F_BASE=0,
            PRECOMPILE_BLAKE2F_PER_ROUND=0,
            PRECOMPILE_POINT_EVALUATION=0,
            PRECOMPILE_BLS_G1ADD=0,
            PRECOMPILE_BLS_G1MUL=0,
            PRECOMPILE_BLS_G1MAP=0,
            PRECOMPILE_BLS_G2ADD=0,
            PRECOMPILE_BLS_G2MUL=0,
            PRECOMPILE_BLS_G2MAP=0,
            PRECOMPILE_BLS_PAIRING_BASE=0,
            PRECOMPILE_BLS_PAIRING_PER_PAIR=0,
            PRECOMPILE_P256VERIFY=0,
            BLOCK_ACCESS_LIST_ITEM=0,
        )

    @classmethod
    def _with_memory_expansion(
        cls,
        base_gas: int | Callable[[OpcodeBase], int],
        memory_expansion_gas_calculator: MemoryExpansionGasCalculator,
    ) -> Callable[[OpcodeBase], int]:
        """
        Wrap a gas cost calculator to include memory expansion cost.

        Args:
            base_gas: Either a constant gas cost (int) or a callable that
                      calculates it
            memory_expansion_gas_calculator: Calculator for memory expansion
                                             cost

        Returns:
            A callable that calculates base_gas + memory_expansion_cost

        """

        def wrapper(opcode: OpcodeBase) -> int:
            # Calculate base gas cost
            if callable(base_gas):
                base_cost = base_gas(opcode)
            else:
                base_cost = base_gas

            # Add memory expansion cost if metadata is present
            new_memory_size = opcode.metadata["new_memory_size"]
            old_memory_size = opcode.metadata["old_memory_size"]
            expansion_cost = memory_expansion_gas_calculator(
                new_bytes=new_memory_size, previous_bytes=old_memory_size
            )

            return base_cost + expansion_cost

        return wrapper

    @classmethod
    def _with_account_access(
        cls,
        base_gas: int | Callable[[OpcodeBase], int],
        gas_costs: "GasCosts",
    ) -> Callable[[OpcodeBase], int]:
        """
        Wrap a gas cost calculator to include account access cost.

        Args:
            base_gas: Either a constant gas cost (int) or a callable that
                      calculates it
            gas_costs: The gas costs dataclass for accessing warm/cold costs

        Returns:
            A callable that calculates base_gas + account_access_cost

        """

        def wrapper(opcode: OpcodeBase) -> int:
            # Calculate base gas cost
            if callable(base_gas):
                base_cost = base_gas(opcode)
            else:
                base_cost = base_gas

            # Add account access cost based on warmth
            if opcode.metadata["address_warm"]:
                access_cost = gas_costs.WARM_ACCESS
            else:
                access_cost = gas_costs.COLD_ACCOUNT_ACCESS

            return base_cost + access_cost

        return wrapper

    @classmethod
    def _with_data_copy(
        cls,
        base_gas: int | Callable[[OpcodeBase], int],
        gas_costs: "GasCosts",
    ) -> Callable[[OpcodeBase], int]:
        """
        Wrap a gas cost calculator to include data copy cost.

        Args:
            base_gas: Either a constant gas cost (int) or a callable that
                      calculates it
            gas_costs: The gas costs dataclass for accessing
                       OPCODE_COPY_PER_WORD

        Returns:
            A callable that calculates base_gas + copy_cost

        """

        def wrapper(opcode: OpcodeBase) -> int:
            # Calculate base gas cost
            if callable(base_gas):
                base_cost = base_gas(opcode)
            else:
                base_cost = base_gas

            # Add copy cost based on data size
            data_size = opcode.metadata["data_size"]
            word_count = (data_size + 31) // 32
            copy_cost = gas_costs.OPCODE_COPY_PER_WORD * word_count

            return base_cost + copy_cost

        return wrapper

    @classmethod
    def opcode_gas_map(
        cls,
    ) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
        """
        Return a mapping of opcodes to their gas costs.

        Each entry is either:
        - Constants (int): Direct gas cost values from gas_costs()
        - Callables: Functions that take the opcode instance with metadata and
                     return gas cost
        """
        gas_costs = cls.gas_costs()
        memory_expansion_calculator = cls.memory_expansion_gas_calculator()

        # Define the opcode gas cost mapping
        # Each entry is either:
        # - an int (constant cost)
        # - a callable(opcode) -> int
        return {
            # Stop and arithmetic operations
            Opcodes.STOP: 0,
            Opcodes.ADD: gas_costs.OPCODE_ADD,
            Opcodes.MUL: gas_costs.OPCODE_MUL,
            Opcodes.SUB: gas_costs.OPCODE_SUB,
            Opcodes.DIV: gas_costs.OPCODE_DIV,
            Opcodes.SDIV: gas_costs.OPCODE_SDIV,
            Opcodes.MOD: gas_costs.OPCODE_MOD,
            Opcodes.SMOD: gas_costs.OPCODE_SMOD,
            Opcodes.ADDMOD: gas_costs.OPCODE_ADDMOD,
            Opcodes.MULMOD: gas_costs.OPCODE_MULMOD,
            Opcodes.EXP: lambda op: (
                gas_costs.OPCODE_EXP_BASE
                + gas_costs.OPCODE_EXP_PER_BYTE
                * ((op.metadata["exponent"].bit_length() + 7) // 8)
            ),
            Opcodes.SIGNEXTEND: gas_costs.OPCODE_SIGNEXTEND,
            # Comparison & bitwise logic operations
            Opcodes.LT: gas_costs.OPCODE_LT,
            Opcodes.GT: gas_costs.OPCODE_GT,
            Opcodes.SLT: gas_costs.OPCODE_SLT,
            Opcodes.SGT: gas_costs.OPCODE_SGT,
            Opcodes.EQ: gas_costs.OPCODE_EQ,
            Opcodes.ISZERO: gas_costs.OPCODE_ISZERO,
            Opcodes.AND: gas_costs.OPCODE_AND,
            Opcodes.OR: gas_costs.OPCODE_OR,
            Opcodes.XOR: gas_costs.OPCODE_XOR,
            Opcodes.NOT: gas_costs.OPCODE_NOT,
            Opcodes.BYTE: gas_costs.OPCODE_BYTE,
            # SHA3
            Opcodes.SHA3: cls._with_memory_expansion(
                lambda op: (
                    gas_costs.OPCODE_KECCAK256_BASE
                    + gas_costs.OPCODE_KECCACK256_PER_WORD
                    * ((op.metadata["data_size"] + 31) // 32)
                ),
                memory_expansion_calculator,
            ),
            # Environmental information
            Opcodes.ADDRESS: gas_costs.BASE,
            Opcodes.BALANCE: cls._with_account_access(0, gas_costs),
            Opcodes.ORIGIN: gas_costs.BASE,
            Opcodes.CALLER: gas_costs.BASE,
            Opcodes.CALLVALUE: gas_costs.BASE,
            Opcodes.CALLDATALOAD: gas_costs.OPCODE_CALLDATALOAD,
            Opcodes.CALLDATASIZE: gas_costs.BASE,
            Opcodes.CALLDATACOPY: cls._with_memory_expansion(
                cls._with_data_copy(
                    gas_costs.OPCODE_CALLDATACOPY_BASE, gas_costs
                ),
                memory_expansion_calculator,
            ),
            Opcodes.CODESIZE: gas_costs.BASE,
            Opcodes.CODECOPY: cls._with_memory_expansion(
                cls._with_data_copy(gas_costs.OPCODE_CODECOPY_BASE, gas_costs),
                memory_expansion_calculator,
            ),
            Opcodes.GASPRICE: gas_costs.BASE,
            Opcodes.EXTCODESIZE: cls._with_account_access(0, gas_costs),
            Opcodes.EXTCODECOPY: cls._with_memory_expansion(
                cls._with_data_copy(
                    cls._with_account_access(0, gas_costs),
                    gas_costs,
                ),
                memory_expansion_calculator,
            ),
            # Block information
            Opcodes.BLOCKHASH: gas_costs.OPCODE_BLOCKHASH,
            Opcodes.COINBASE: gas_costs.OPCODE_COINBASE,
            Opcodes.TIMESTAMP: gas_costs.BASE,
            Opcodes.NUMBER: gas_costs.BASE,
            Opcodes.PREVRANDAO: gas_costs.BASE,
            Opcodes.GASLIMIT: gas_costs.BASE,
            # Stack, memory, storage and flow operations
            Opcodes.POP: gas_costs.BASE,
            Opcodes.MLOAD: cls._with_memory_expansion(
                gas_costs.OPCODE_MLOAD_BASE,
                memory_expansion_calculator,
            ),
            Opcodes.MSTORE: cls._with_memory_expansion(
                gas_costs.OPCODE_MSTORE_BASE,
                memory_expansion_calculator,
            ),
            Opcodes.MSTORE8: cls._with_memory_expansion(
                gas_costs.OPCODE_MSTORE8_BASE,
                memory_expansion_calculator,
            ),
            Opcodes.SLOAD: lambda op: (
                gas_costs.WARM_SLOAD
                if op.metadata["key_warm"]
                else gas_costs.COLD_STORAGE_ACCESS
            ),
            Opcodes.SSTORE: lambda op: cls._calculate_sstore_gas(
                op, gas_costs
            ),
            Opcodes.JUMP: gas_costs.OPCODE_JUMP,
            Opcodes.JUMPI: gas_costs.OPCODE_JUMPI,
            Opcodes.PC: gas_costs.BASE,
            Opcodes.MSIZE: gas_costs.BASE,
            Opcodes.GAS: gas_costs.BASE,
            Opcodes.JUMPDEST: gas_costs.OPCODE_JUMPDEST,
            # Push operations (PUSH1 through PUSH32)
            **{
                getattr(Opcodes, f"PUSH{i}"): gas_costs.OPCODE_PUSH
                for i in range(1, 33)
            },
            # Dup operations (DUP1 through DUP16)
            **{
                getattr(Opcodes, f"DUP{i}"): gas_costs.OPCODE_DUP
                for i in range(1, 17)
            },
            # Swap operations (SWAP1 through SWAP16)
            **{
                getattr(Opcodes, f"SWAP{i}"): gas_costs.OPCODE_SWAP
                for i in range(1, 17)
            },
            # Logging operations
            Opcodes.LOG0: cls._with_memory_expansion(
                lambda op: (
                    gas_costs.OPCODE_LOG_BASE
                    + gas_costs.OPCODE_LOG_DATA_PER_BYTE
                    * op.metadata["data_size"]
                ),
                memory_expansion_calculator,
            ),
            Opcodes.LOG1: cls._with_memory_expansion(
                lambda op: (
                    gas_costs.OPCODE_LOG_BASE
                    + gas_costs.OPCODE_LOG_DATA_PER_BYTE
                    * op.metadata["data_size"]
                    + gas_costs.OPCODE_LOG_TOPIC
                ),
                memory_expansion_calculator,
            ),
            Opcodes.LOG2: cls._with_memory_expansion(
                lambda op: (
                    gas_costs.OPCODE_LOG_BASE
                    + gas_costs.OPCODE_LOG_DATA_PER_BYTE
                    * op.metadata["data_size"]
                    + gas_costs.OPCODE_LOG_TOPIC * 2
                ),
                memory_expansion_calculator,
            ),
            Opcodes.LOG3: cls._with_memory_expansion(
                lambda op: (
                    gas_costs.OPCODE_LOG_BASE
                    + gas_costs.OPCODE_LOG_DATA_PER_BYTE
                    * op.metadata["data_size"]
                    + gas_costs.OPCODE_LOG_TOPIC * 3
                ),
                memory_expansion_calculator,
            ),
            Opcodes.LOG4: cls._with_memory_expansion(
                lambda op: (
                    gas_costs.OPCODE_LOG_BASE
                    + gas_costs.OPCODE_LOG_DATA_PER_BYTE
                    * op.metadata["data_size"]
                    + gas_costs.OPCODE_LOG_TOPIC * 4
                ),
                memory_expansion_calculator,
            ),
            # System operations
            Opcodes.CREATE: cls._with_memory_expansion(
                lambda op: cls._calculate_create_gas(op, gas_costs),
                memory_expansion_calculator,
            ),
            Opcodes.CALL: cls._with_memory_expansion(
                lambda op: cls._calculate_call_gas(op, gas_costs),
                memory_expansion_calculator,
            ),
            Opcodes.CALLCODE: cls._with_memory_expansion(
                lambda op: cls._calculate_call_gas(op, gas_costs),
                memory_expansion_calculator,
            ),
            Opcodes.RETURN: cls._with_memory_expansion(
                lambda op: cls._calculate_return_gas(op, gas_costs),
                memory_expansion_calculator,
            ),
            Opcodes.INVALID: 0,
            Opcodes.SELFDESTRUCT: lambda op: cls._calculate_selfdestruct_gas(
                op, gas_costs
            ),
        }

    @classmethod
    def opcode_gas_calculator(cls) -> OpcodeGasCalculator:
        """
        Return callable that calculates the gas cost of a single opcode.
        """
        opcode_gas_map = cls.opcode_gas_map()

        def fn(opcode: OpcodeBase) -> int:
            # Get the gas cost or calculator
            if opcode not in opcode_gas_map:
                raise ValueError(
                    f"No gas cost defined for opcode: {opcode._name_}"
                )
            gas_cost_or_calculator = opcode_gas_map[opcode]

            # If it's a callable, call it with the opcode
            if callable(gas_cost_or_calculator):
                return gas_cost_or_calculator(opcode)

            # Otherwise it's a constant
            return gas_cost_or_calculator

        return fn

    @classmethod
    def opcode_refund_map(
        cls,
    ) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
        """
        Return a mapping of opcodes to their gas refunds.

        Each entry is either:
        - Constants (int): Direct gas refund values
        - Callables: Functions that take the opcode instance with metadata and
                     return gas refund
        """
        gas_costs = cls.gas_costs()

        # Only SSTORE provides refunds
        return {
            Opcodes.SSTORE: lambda op: cls._calculate_sstore_refund(
                op, gas_costs
            ),
        }

    @classmethod
    def opcode_refund_calculator(cls) -> OpcodeGasCalculator:
        """
        Return callable that calculates the gas refund of a single opcode.
        """
        opcode_refund_map = cls.opcode_refund_map()

        def fn(opcode: OpcodeBase) -> int:
            # Get the gas refund or calculator
            if opcode not in opcode_refund_map:
                # Most opcodes don't provide refunds
                return 0
            refund_or_calculator = opcode_refund_map[opcode]

            # If it's a callable, call it with the opcode
            if callable(refund_or_calculator):
                return refund_or_calculator(opcode)

            # Otherwise it's a constant
            return refund_or_calculator

        return fn

    @classmethod
    def _calculate_sstore_refund(
        cls, opcode: OpcodeBase, gas_costs: GasCosts
    ) -> int:
        """Calculate SSTORE gas refund based on metadata."""
        metadata = opcode.metadata

        original_value = metadata["original_value"]
        current_value = metadata["current_value"]
        if current_value is None:
            current_value = original_value
        new_value = metadata["new_value"]

        # Refund is provided when setting from non-zero to zero
        refund = 0
        if current_value != new_value:
            if original_value != 0 and current_value != 0 and new_value == 0:
                # Storage is cleared for the first time in the transaction
                refund += gas_costs.REFUND_STORAGE_CLEAR

            if original_value != 0 and current_value == 0:
                # Gas refund issued earlier to be reversed
                refund -= gas_costs.REFUND_STORAGE_CLEAR

            if original_value == new_value:
                # Storage slot being restored to its original value
                if original_value == 0:
                    # Slot was originally empty and was SET earlier
                    refund += gas_costs.STORAGE_SET - gas_costs.WARM_SLOAD
                else:
                    # Slot was originally non-empty and was UPDATED earlier
                    refund += (
                        gas_costs.COLD_STORAGE_WRITE
                        - gas_costs.COLD_STORAGE_ACCESS
                        - gas_costs.WARM_SLOAD
                    )

        return refund

    @classmethod
    def _calculate_sstore_gas(
        cls, opcode: OpcodeBase, gas_costs: GasCosts
    ) -> int:
        """Calculate SSTORE gas cost based on metadata."""
        metadata = opcode.metadata

        original_value = metadata["original_value"]
        current_value = metadata["current_value"]
        if current_value is None:
            current_value = original_value
        new_value = metadata["new_value"]

        gas_cost = 0 if metadata["key_warm"] else gas_costs.COLD_STORAGE_ACCESS

        if original_value == current_value and current_value != new_value:
            if original_value == 0:
                gas_cost += gas_costs.STORAGE_SET
            else:
                gas_cost += (
                    gas_costs.COLD_STORAGE_WRITE
                    - gas_costs.COLD_STORAGE_ACCESS
                )
        else:
            gas_cost += gas_costs.WARM_SLOAD

        return gas_cost

    @classmethod
    def _calculate_call_gas(
        cls, opcode: OpcodeBase, gas_costs: GasCosts
    ) -> int:
        """
        Calculate CALL/DELEGATECALL/STATICCALL gas cost based on metadata.
        """
        metadata = opcode.metadata

        # Base cost depends on address warmth
        if metadata["address_warm"]:
            base_cost = gas_costs.WARM_ACCESS
        else:
            base_cost = gas_costs.COLD_ACCOUNT_ACCESS

        if metadata["inner_call_cost"]:
            return base_cost + metadata["inner_call_cost"]

        return base_cost

    @classmethod
    def _calculate_create_gas(
        cls, opcode: OpcodeBase, gas_costs: GasCosts
    ) -> int:
        """CREATE gas is constant at Frontier."""
        del opcode
        return gas_costs.OPCODE_CREATE_BASE

    @classmethod
    def _calculate_create2_gas(
        cls, opcode: OpcodeBase, gas_costs: GasCosts
    ) -> int:
        """
        Calculate CREATE2 gas cost including initcode cost.
        """
        raise NotImplementedError(
            f"CREATE2 opcode is not supported in {cls.name()}"
        )

    @classmethod
    def _calculate_return_gas(
        cls, opcode: OpcodeBase, gas_costs: GasCosts
    ) -> int:
        """Calculate RETURN gas cost based on metadata."""
        metadata = opcode.metadata

        # Code deposit cost when returning from initcode
        code_deposit_size = metadata["code_deposit_size"]
        return gas_costs.CODE_DEPOSIT_PER_BYTE * code_deposit_size

    @classmethod
    def _calculate_selfdestruct_gas(
        cls, opcode: OpcodeBase, gas_costs: GasCosts
    ) -> int:
        """Calculate SELFDESTRUCT gas cost based on metadata."""
        metadata = opcode.metadata

        base_cost = gas_costs.OPCODE_SELFDESTRUCT_BASE

        # Check if the beneficiary is cold
        if not metadata["address_warm"]:
            base_cost += gas_costs.COLD_ACCOUNT_ACCESS

        # Check if creating a new account
        if metadata["account_new"]:
            base_cost += gas_costs.NEW_ACCOUNT

        return base_cost

    @classmethod
    def memory_expansion_gas_calculator(cls) -> MemoryExpansionGasCalculator:
        """
        Return callable that calculates the gas cost of memory expansion for
        the fork.
        """
        gas_costs = cls.gas_costs()

        def fn(*, new_bytes: int, previous_bytes: int = 0) -> int:
            if new_bytes <= previous_bytes:
                return 0
            new_words = ceiling_division(new_bytes, 32)
            previous_words = ceiling_division(previous_bytes, 32)

            def c(w: int) -> int:
                return (gas_costs.MEMORY_PER_WORD * w) + ((w * w) // 512)

            return c(new_words) - c(previous_words)

        return fn

    @classmethod
    def calldata_gas_calculator(cls) -> CalldataGasCalculator:
        """
        Return callable that calculates the transaction gas cost for its
        calldata depending on its contents.
        """
        gas_costs = cls.gas_costs()

        def fn(*, data: BytesConvertible, floor: bool = False) -> int:
            del floor

            raw = Bytes(data)
            num_zeros = raw.count(0)
            num_non_zeros = len(raw) - num_zeros
            return (
                num_zeros * gas_costs.TX_DATA_PER_ZERO
                + num_non_zeros * gas_costs.TX_DATA_PER_NON_ZERO
            )

        return fn

    @classmethod
    def base_fee_per_gas_calculator(cls) -> BaseFeePerGasCalculator:
        """
        Return a callable that calculates the base fee per gas at a given fork.
        """
        raise NotImplementedError(
            f"Base fee per gas calculator is not supported in {cls.name()}"
        )

    @classmethod
    def base_fee_change_calculator(cls) -> BaseFeeChangeCalculator:
        """
        Return a callable that calculates the gas that needs to be used to
        change the base fee.
        """
        raise NotImplementedError(
            f"Base fee change calculator is not supported in {cls.name()}"
        )

    @classmethod
    def base_fee_max_change_denominator(cls) -> int:
        """Return the base fee max change denominator at a given fork."""
        raise NotImplementedError(
            f"Base fee max change denominator is not supported in {cls.name()}"
        )

    @classmethod
    def base_fee_elasticity_multiplier(cls) -> int:
        """Return the base fee elasticity multiplier at a given fork."""
        raise NotImplementedError(
            f"Base fee elasticity multiplier is not supported in {cls.name()}"
        )

    @classmethod
    def transaction_data_floor_cost_calculator(
        cls,
    ) -> TransactionDataFloorCostCalculator:
        """At frontier, the transaction data floor cost is a constant zero."""

        def fn(*, data: BytesConvertible) -> int:
            del data
            return 0

        return fn

    @classmethod
    def transaction_intrinsic_cost_calculator(
        cls,
    ) -> TransactionIntrinsicCostCalculator:
        """
        Return callable that calculates the intrinsic gas cost of a transaction
        for the fork.
        """
        gas_costs = cls.gas_costs()
        calldata_gas_calculator = cls.calldata_gas_calculator()

        def fn(
            *,
            calldata: BytesConvertible = b"",
            contract_creation: bool = False,
            access_list: List[AccessList] | None = None,
            authorization_list_or_count: Sized | int | None = None,
            return_cost_deducted_prior_execution: bool = False,
        ) -> int:
            del return_cost_deducted_prior_execution

            assert access_list is None, (
                f"Access list is not supported in {cls.name()}"
            )
            assert authorization_list_or_count is None, (
                f"Authorizations are not supported in {cls.name()}"
            )

            intrinsic_cost: int = gas_costs.TX_BASE

            if contract_creation:
                intrinsic_cost += (
                    gas_costs.CODE_INIT_PER_WORD
                    * ceiling_division(len(Bytes(calldata)), 32)
                )

            return intrinsic_cost + calldata_gas_calculator(data=calldata)

        return fn

    @classmethod
    def blob_gas_price_calculator(cls) -> BlobGasPriceCalculator:
        """
        Return a callable that calculates the blob gas price at a given fork.
        """
        raise NotImplementedError(
            f"Blob gas price calculator is not supported in {cls.name()}"
        )

    @classmethod
    def excess_blob_gas_calculator(cls) -> ExcessBlobGasCalculator:
        """
        Return a callable that calculates the excess blob gas for a block at a
        given fork.
        """
        raise NotImplementedError(
            f"Excess blob gas calculator is not supported in {cls.name()}"
        )

    @classmethod
    def supports_blobs(cls) -> bool:
        """Blobs are not supported at Frontier."""
        return False

    @classmethod
    def blob_reserve_price_active(cls) -> bool:
        """
        Return whether the fork uses a reserve price mechanism for blobs or
        not.
        """
        raise NotImplementedError(
            f"Blob reserve price is not supported in {cls.name()}"
        )

    @classmethod
    def full_blob_tx_wrapper_version(cls) -> int | None:
        """Return the version of the full blob transaction wrapper."""
        raise NotImplementedError(
            "Full blob transaction wrapper version is not supported in "
            f"{cls.name()}"
        )

    @classmethod
    def blob_schedule(cls) -> BlobSchedule | None:
        """At genesis, no blob schedule is used."""
        return None

    @classmethod
    def header_requests_required(cls) -> bool:
        """At genesis, header must not contain beacon chain requests."""
        return False

    @classmethod
    def header_bal_hash_required(cls) -> bool:
        """At genesis, header must not contain block access list hash."""
        return False

    @classmethod
    def empty_block_bal_item_count(cls) -> int:
        """Pre-Amsterdam forks have no block access list."""
        return 0

    @classmethod
    def header_beacon_root_required(cls) -> bool:
        """At genesis, header must not contain parent beacon block root."""
        return False

    @classmethod
    def engine_new_payload_blob_hashes(cls) -> bool:
        """At genesis, payloads do not have blob hashes."""
        return False

    @classmethod
    def engine_new_payload_beacon_root(cls) -> bool:
        """At genesis, payloads do not have a parent beacon block root."""
        return False

    @classmethod
    def engine_new_payload_requests(cls) -> bool:
        """At genesis, payloads do not have requests."""
        return False

    @classmethod
    def engine_execution_payload_block_access_list(cls) -> bool:
        """At genesis, payloads do not have block access list."""
        return False

    @classmethod
    def engine_new_payload_target_blobs_per_block(cls) -> bool:
        """At genesis, payloads do not have target blobs per block."""
        return False

    @classmethod
    def engine_payload_attribute_target_blobs_per_block(cls) -> bool:
        """
        At genesis, payload attributes do not include the target blobs per
        block.
        """
        return False

    @classmethod
    def engine_payload_attribute_max_blobs_per_block(cls) -> bool:
        """
        At genesis, payload attributes do not include the max blobs per block.
        """
        return False

    @classmethod
    def get_reward(cls) -> int:
        """
        At Genesis the expected reward amount in wei is
        5_000_000_000_000_000_000.
        """
        return 5_000_000_000_000_000_000

    @classmethod
    def supports_protected_txs(cls) -> bool:
        """At Genesis, fork has no support for EIP-155 protected txs."""
        return False

    @classmethod
    def tx_types(cls) -> List[int]:
        """At Genesis, only legacy transactions are allowed."""
        return [0]

    @classmethod
    def contract_creating_tx_types(cls) -> List[int]:
        """At Genesis, only legacy transactions are allowed."""
        return [0]

    @classmethod
    def transaction_gas_limit_cap(cls) -> int | None:
        """At Genesis, no transaction gas limit cap is imposed."""
        return None

    @classmethod
    def block_rlp_size_limit(cls) -> int | None:
        """At Genesis, no RLP block size limit is imposed."""
        return None

    @classmethod
    def precompiles(cls) -> List[Address]:
        """
        At Genesis, EC-recover, SHA256, RIPEMD160, and Identity precompiles
        are introduced.
        """
        return [
            Address(1, label="ECREC"),
            Address(2, label="SHA256"),
            Address(3, label="RIPEMD160"),
            Address(4, label="ID"),
        ]

    @classmethod
    def system_contracts(cls) -> List[Address]:
        """At Genesis, no system contracts are present."""
        return []

    @classmethod
    def deterministic_factory_predeploy_address(cls) -> Address | None:
        """At Genesis, no deterministic factory predeploy is present."""
        return None

    @classmethod
    def max_code_size(cls) -> int:
        """
        At genesis, there is no upper bound for code size (bounded by block gas
        limit).

        However, the default is set to the limit of EIP-170 (Spurious Dragon)
        """
        return 0x6000

    @classmethod
    def max_stack_height(cls) -> int:
        """At genesis, the maximum stack height is 1024."""
        return 1024

    @classmethod
    def max_initcode_size(cls) -> int:
        """
        At genesis, there is no upper bound for initcode size.

        However, the default is set to the limit of EIP-3860 (Shanghai).
        """
        return 0xC000

    @classmethod
    def call_opcodes(cls) -> List[Opcodes]:
        """Return list of call opcodes supported by the fork."""
        return [Opcodes.CALL, Opcodes.CALLCODE]

    @classmethod
    def valid_opcodes(cls) -> List[Opcodes]:
        """Return list of Opcodes that are valid to work on this fork."""
        return [
            Opcodes.STOP,
            Opcodes.ADD,
            Opcodes.MUL,
            Opcodes.SUB,
            Opcodes.DIV,
            Opcodes.SDIV,
            Opcodes.MOD,
            Opcodes.SMOD,
            Opcodes.ADDMOD,
            Opcodes.MULMOD,
            Opcodes.EXP,
            Opcodes.SIGNEXTEND,
            Opcodes.LT,
            Opcodes.GT,
            Opcodes.SLT,
            Opcodes.SGT,
            Opcodes.EQ,
            Opcodes.ISZERO,
            Opcodes.AND,
            Opcodes.OR,
            Opcodes.XOR,
            Opcodes.NOT,
            Opcodes.BYTE,
            Opcodes.SHA3,
            Opcodes.ADDRESS,
            Opcodes.BALANCE,
            Opcodes.ORIGIN,
            Opcodes.CALLER,
            Opcodes.CALLVALUE,
            Opcodes.CALLDATALOAD,
            Opcodes.CALLDATASIZE,
            Opcodes.CALLDATACOPY,
            Opcodes.CODESIZE,
            Opcodes.CODECOPY,
            Opcodes.GASPRICE,
            Opcodes.EXTCODESIZE,
            Opcodes.EXTCODECOPY,
            Opcodes.BLOCKHASH,
            Opcodes.COINBASE,
            Opcodes.TIMESTAMP,
            Opcodes.NUMBER,
            Opcodes.PREVRANDAO,
            Opcodes.GASLIMIT,
            Opcodes.POP,
            Opcodes.MLOAD,
            Opcodes.MSTORE,
            Opcodes.MSTORE8,
            Opcodes.SLOAD,
            Opcodes.SSTORE,
            Opcodes.PC,
            Opcodes.MSIZE,
            Opcodes.GAS,
            Opcodes.JUMP,
            Opcodes.JUMPI,
            Opcodes.JUMPDEST,
            Opcodes.PUSH1,
            Opcodes.PUSH2,
            Opcodes.PUSH3,
            Opcodes.PUSH4,
            Opcodes.PUSH5,
            Opcodes.PUSH6,
            Opcodes.PUSH7,
            Opcodes.PUSH8,
            Opcodes.PUSH9,
            Opcodes.PUSH10,
            Opcodes.PUSH11,
            Opcodes.PUSH12,
            Opcodes.PUSH13,
            Opcodes.PUSH14,
            Opcodes.PUSH15,
            Opcodes.PUSH16,
            Opcodes.PUSH17,
            Opcodes.PUSH18,
            Opcodes.PUSH19,
            Opcodes.PUSH20,
            Opcodes.PUSH21,
            Opcodes.PUSH22,
            Opcodes.PUSH23,
            Opcodes.PUSH24,
            Opcodes.PUSH25,
            Opcodes.PUSH26,
            Opcodes.PUSH27,
            Opcodes.PUSH28,
            Opcodes.PUSH29,
            Opcodes.PUSH30,
            Opcodes.PUSH31,
            Opcodes.PUSH32,
            Opcodes.DUP1,
            Opcodes.DUP2,
            Opcodes.DUP3,
            Opcodes.DUP4,
            Opcodes.DUP5,
            Opcodes.DUP6,
            Opcodes.DUP7,
            Opcodes.DUP8,
            Opcodes.DUP9,
            Opcodes.DUP10,
            Opcodes.DUP11,
            Opcodes.DUP12,
            Opcodes.DUP13,
            Opcodes.DUP14,
            Opcodes.DUP15,
            Opcodes.DUP16,
            Opcodes.SWAP1,
            Opcodes.SWAP2,
            Opcodes.SWAP3,
            Opcodes.SWAP4,
            Opcodes.SWAP5,
            Opcodes.SWAP6,
            Opcodes.SWAP7,
            Opcodes.SWAP8,
            Opcodes.SWAP9,
            Opcodes.SWAP10,
            Opcodes.SWAP11,
            Opcodes.SWAP12,
            Opcodes.SWAP13,
            Opcodes.SWAP14,
            Opcodes.SWAP15,
            Opcodes.SWAP16,
            Opcodes.LOG0,
            Opcodes.LOG1,
            Opcodes.LOG2,
            Opcodes.LOG3,
            Opcodes.LOG4,
            Opcodes.CREATE,
            Opcodes.CALL,
            Opcodes.CALLCODE,
            Opcodes.RETURN,
            Opcodes.SELFDESTRUCT,
        ]

    @classmethod
    def create_opcodes(cls) -> List[Opcodes]:
        """At Genesis, only `CREATE` opcode is supported."""
        return [Opcodes.CREATE]

    @classmethod
    def max_refund_quotient(cls) -> int:
        """Return the max refund quotient at Genesis."""
        return 2

    @classmethod
    def max_request_type(cls) -> int:
        """At genesis, no request type is supported, signaled by -1."""
        return -1

    @classmethod
    def pre_allocation(cls) -> Mapping:
        """
        Return whether the fork expects pre-allocation of accounts.

        Frontier does not require pre-allocated accounts
        """
        return {}

    @classmethod
    def pre_allocation_blockchain(cls) -> Mapping:
        """
        Return whether the fork expects pre-allocation of accounts.

        Frontier does not require pre-allocated accounts
        """
        return {}

    @classmethod
    def build_default_block_header(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> FixtureHeader:
        """
        Build a default block header for this fork with the given attributes.

        This method automatically detects which header fields are required by
        the fork and assigns appropriate default values. It introspects the
        FixtureHeader model to find fields with HeaderForkRequirement
        annotations and automatically includes them if the fork requires them.

        Args:
            block_number: The block number
            timestamp: The block timestamp

        Returns:
            FixtureHeader instance with default values applied based on fork
            requirements.

        Raises:
            TypeError: If the overrides don't have the correct type.

        """
        from execution_testing.fixtures.blockchain import FixtureHeader

        defaults = {
            "number": ZeroPaddedHexNumber(block_number),
            "timestamp": ZeroPaddedHexNumber(timestamp),
            "fork": cls,
        }

        # Iterate through FixtureHeader fields to populate defaults
        for field_name, field_info in FixtureHeader.model_fields.items():
            if field_name in defaults:
                continue

            # Get default value, checking fork requirements and model defaults
            default_value = FixtureHeader.get_default_from_annotation(
                fork=cls,
                field_name=field_name,
                field_hint=field_info.annotation,
            )
            if default_value is not None:
                defaults[field_name] = default_value

        return FixtureHeader(**defaults)

transition_tool_name() classmethod

Return fork name as it's meant to be passed to the transition tool for execution.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def transition_tool_name(cls) -> str:
    """
    Return fork name as it's meant to be passed to the transition tool for
    execution.
    """
    if cls._transition_tool_name is not None:
        return cls._transition_tool_name
    return cls.name()

solc_name() classmethod

Return fork name as it's meant to be passed to the solc compiler.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def solc_name(cls) -> str:
    """Return fork name as it's meant to be passed to the solc compiler."""
    if cls._solc_name is not None:
        return cls._solc_name
    return cls.name().lower()

header_base_fee_required() classmethod

At genesis, header must not contain base fee.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def header_base_fee_required(cls) -> bool:
    """At genesis, header must not contain base fee."""
    return False

header_prev_randao_required() classmethod

At genesis, header must not contain Prev Randao value.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def header_prev_randao_required(cls) -> bool:
    """At genesis, header must not contain Prev Randao value."""
    return False

header_zero_difficulty_required() classmethod

At genesis, header must not have difficulty zero.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def header_zero_difficulty_required(cls) -> bool:
    """At genesis, header must not have difficulty zero."""
    return False

header_withdrawals_required() classmethod

At genesis, header must not contain withdrawals.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def header_withdrawals_required(cls) -> bool:
    """At genesis, header must not contain withdrawals."""
    return False

header_excess_blob_gas_required() classmethod

At genesis, header must not contain excess blob gas.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def header_excess_blob_gas_required(cls) -> bool:
    """At genesis, header must not contain excess blob gas."""
    return False

header_blob_gas_used_required() classmethod

At genesis, header must not contain blob gas used.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def header_blob_gas_used_required(cls) -> bool:
    """At genesis, header must not contain blob gas used."""
    return False

gas_costs() classmethod

Return dataclass with the defined gas costs constants for genesis.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def gas_costs(cls) -> GasCosts:
    """
    Return dataclass with the defined gas costs constants for genesis.
    """
    return GasCosts(
        # Tiers
        BASE=BASE,
        VERY_LOW=VERY_LOW,
        LOW=LOW,
        MID=MID,
        HIGH=HIGH,
        # Access
        WARM_ACCESS=100,
        COLD_ACCOUNT_ACCESS=2_600,
        WARM_SLOAD=100,
        COLD_STORAGE_ACCESS=2_100,
        # Storage
        STORAGE_SET=20_000,
        COLD_STORAGE_WRITE=5_000,
        STORAGE_RESET=2_900,
        # Call
        CALL_VALUE=9_000,
        CALL_STIPEND=2_300,
        NEW_ACCOUNT=25_000,
        # Contract Creation
        CODE_DEPOSIT_PER_BYTE=200,
        CODE_INIT_PER_WORD=2,
        # Authorization
        AUTH_PER_EMPTY_ACCOUNT=0,
        # Utility
        MEMORY_PER_WORD=3,
        # Transactions
        TX_BASE=21_000,
        TX_ACCESS_LIST_ADDRESS=2_400,
        TX_ACCESS_LIST_STORAGE_KEY=1_900,
        TX_DATA_PER_ZERO=4,
        TX_DATA_PER_NON_ZERO=68,
        TX_CREATE=32_000,
        # Refunds
        REFUND_STORAGE_CLEAR=4_800,
        REFUND_AUTH_PER_EXISTING_ACCOUNT=0,
        # Precompiles
        PRECOMPILE_ECRECOVER=3_000,
        PRECOMPILE_SHA256_BASE=60,
        PRECOMPILE_SHA256_PER_WORD=12,
        PRECOMPILE_RIPEMD160_BASE=600,
        PRECOMPILE_RIPEMD160_PER_WORD=120,
        PRECOMPILE_IDENTITY_BASE=15,
        PRECOMPILE_IDENTITY_PER_WORD=3,
        # Static Opcodes
        OPCODE_ADD=VERY_LOW,
        OPCODE_SUB=VERY_LOW,
        OPCODE_MUL=LOW,
        OPCODE_DIV=LOW,
        OPCODE_SDIV=LOW,
        OPCODE_MOD=LOW,
        OPCODE_SMOD=LOW,
        OPCODE_ADDMOD=MID,
        OPCODE_MULMOD=MID,
        OPCODE_SIGNEXTEND=LOW,
        OPCODE_LT=VERY_LOW,
        OPCODE_GT=VERY_LOW,
        OPCODE_SLT=VERY_LOW,
        OPCODE_SGT=VERY_LOW,
        OPCODE_EQ=VERY_LOW,
        OPCODE_ISZERO=VERY_LOW,
        OPCODE_AND=VERY_LOW,
        OPCODE_OR=VERY_LOW,
        OPCODE_XOR=VERY_LOW,
        OPCODE_NOT=VERY_LOW,
        OPCODE_BYTE=VERY_LOW,
        OPCODE_JUMP=MID,
        OPCODE_JUMPI=HIGH,
        OPCODE_JUMPDEST=1,
        OPCODE_CALLDATALOAD=VERY_LOW,
        OPCODE_BLOCKHASH=20,
        OPCODE_COINBASE=BASE,
        OPCODE_PUSH=VERY_LOW,
        OPCODE_DUP=VERY_LOW,
        OPCODE_SWAP=VERY_LOW,
        # Dynamic Opcode Components
        OPCODE_CALLDATACOPY_BASE=VERY_LOW,
        OPCODE_CODECOPY_BASE=VERY_LOW,
        OPCODE_MLOAD_BASE=VERY_LOW,
        OPCODE_MSTORE_BASE=VERY_LOW,
        OPCODE_MSTORE8_BASE=VERY_LOW,
        OPCODE_SELFDESTRUCT_BASE=5_000,
        OPCODE_COPY_PER_WORD=3,
        OPCODE_CREATE_BASE=32_000,
        OPCODE_EXP_BASE=10,
        OPCODE_EXP_PER_BYTE=50,
        OPCODE_LOG_BASE=375,
        OPCODE_LOG_DATA_PER_BYTE=8,
        OPCODE_LOG_TOPIC=375,
        OPCODE_KECCAK256_BASE=30,
        OPCODE_KECCACK256_PER_WORD=6,
        # Zero-initialized: introduced in later forks, set via
        # replace() in the fork that activates them.
        TX_DATA_TOKEN_STANDARD=0,
        TX_DATA_TOKEN_FLOOR=0,
        PRECOMPILE_ECADD=0,
        PRECOMPILE_ECMUL=0,
        PRECOMPILE_ECPAIRING_BASE=0,
        PRECOMPILE_ECPAIRING_PER_POINT=0,
        PRECOMPILE_BLAKE2F_BASE=0,
        PRECOMPILE_BLAKE2F_PER_ROUND=0,
        PRECOMPILE_POINT_EVALUATION=0,
        PRECOMPILE_BLS_G1ADD=0,
        PRECOMPILE_BLS_G1MUL=0,
        PRECOMPILE_BLS_G1MAP=0,
        PRECOMPILE_BLS_G2ADD=0,
        PRECOMPILE_BLS_G2MUL=0,
        PRECOMPILE_BLS_G2MAP=0,
        PRECOMPILE_BLS_PAIRING_BASE=0,
        PRECOMPILE_BLS_PAIRING_PER_PAIR=0,
        PRECOMPILE_P256VERIFY=0,
        BLOCK_ACCESS_LIST_ITEM=0,
    )

opcode_gas_map() classmethod

Return a mapping of opcodes to their gas costs.

Each entry is either: - Constants (int): Direct gas cost values from gas_costs() - Callables: Functions that take the opcode instance with metadata and return gas cost

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def opcode_gas_map(
    cls,
) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
    """
    Return a mapping of opcodes to their gas costs.

    Each entry is either:
    - Constants (int): Direct gas cost values from gas_costs()
    - Callables: Functions that take the opcode instance with metadata and
                 return gas cost
    """
    gas_costs = cls.gas_costs()
    memory_expansion_calculator = cls.memory_expansion_gas_calculator()

    # Define the opcode gas cost mapping
    # Each entry is either:
    # - an int (constant cost)
    # - a callable(opcode) -> int
    return {
        # Stop and arithmetic operations
        Opcodes.STOP: 0,
        Opcodes.ADD: gas_costs.OPCODE_ADD,
        Opcodes.MUL: gas_costs.OPCODE_MUL,
        Opcodes.SUB: gas_costs.OPCODE_SUB,
        Opcodes.DIV: gas_costs.OPCODE_DIV,
        Opcodes.SDIV: gas_costs.OPCODE_SDIV,
        Opcodes.MOD: gas_costs.OPCODE_MOD,
        Opcodes.SMOD: gas_costs.OPCODE_SMOD,
        Opcodes.ADDMOD: gas_costs.OPCODE_ADDMOD,
        Opcodes.MULMOD: gas_costs.OPCODE_MULMOD,
        Opcodes.EXP: lambda op: (
            gas_costs.OPCODE_EXP_BASE
            + gas_costs.OPCODE_EXP_PER_BYTE
            * ((op.metadata["exponent"].bit_length() + 7) // 8)
        ),
        Opcodes.SIGNEXTEND: gas_costs.OPCODE_SIGNEXTEND,
        # Comparison & bitwise logic operations
        Opcodes.LT: gas_costs.OPCODE_LT,
        Opcodes.GT: gas_costs.OPCODE_GT,
        Opcodes.SLT: gas_costs.OPCODE_SLT,
        Opcodes.SGT: gas_costs.OPCODE_SGT,
        Opcodes.EQ: gas_costs.OPCODE_EQ,
        Opcodes.ISZERO: gas_costs.OPCODE_ISZERO,
        Opcodes.AND: gas_costs.OPCODE_AND,
        Opcodes.OR: gas_costs.OPCODE_OR,
        Opcodes.XOR: gas_costs.OPCODE_XOR,
        Opcodes.NOT: gas_costs.OPCODE_NOT,
        Opcodes.BYTE: gas_costs.OPCODE_BYTE,
        # SHA3
        Opcodes.SHA3: cls._with_memory_expansion(
            lambda op: (
                gas_costs.OPCODE_KECCAK256_BASE
                + gas_costs.OPCODE_KECCACK256_PER_WORD
                * ((op.metadata["data_size"] + 31) // 32)
            ),
            memory_expansion_calculator,
        ),
        # Environmental information
        Opcodes.ADDRESS: gas_costs.BASE,
        Opcodes.BALANCE: cls._with_account_access(0, gas_costs),
        Opcodes.ORIGIN: gas_costs.BASE,
        Opcodes.CALLER: gas_costs.BASE,
        Opcodes.CALLVALUE: gas_costs.BASE,
        Opcodes.CALLDATALOAD: gas_costs.OPCODE_CALLDATALOAD,
        Opcodes.CALLDATASIZE: gas_costs.BASE,
        Opcodes.CALLDATACOPY: cls._with_memory_expansion(
            cls._with_data_copy(
                gas_costs.OPCODE_CALLDATACOPY_BASE, gas_costs
            ),
            memory_expansion_calculator,
        ),
        Opcodes.CODESIZE: gas_costs.BASE,
        Opcodes.CODECOPY: cls._with_memory_expansion(
            cls._with_data_copy(gas_costs.OPCODE_CODECOPY_BASE, gas_costs),
            memory_expansion_calculator,
        ),
        Opcodes.GASPRICE: gas_costs.BASE,
        Opcodes.EXTCODESIZE: cls._with_account_access(0, gas_costs),
        Opcodes.EXTCODECOPY: cls._with_memory_expansion(
            cls._with_data_copy(
                cls._with_account_access(0, gas_costs),
                gas_costs,
            ),
            memory_expansion_calculator,
        ),
        # Block information
        Opcodes.BLOCKHASH: gas_costs.OPCODE_BLOCKHASH,
        Opcodes.COINBASE: gas_costs.OPCODE_COINBASE,
        Opcodes.TIMESTAMP: gas_costs.BASE,
        Opcodes.NUMBER: gas_costs.BASE,
        Opcodes.PREVRANDAO: gas_costs.BASE,
        Opcodes.GASLIMIT: gas_costs.BASE,
        # Stack, memory, storage and flow operations
        Opcodes.POP: gas_costs.BASE,
        Opcodes.MLOAD: cls._with_memory_expansion(
            gas_costs.OPCODE_MLOAD_BASE,
            memory_expansion_calculator,
        ),
        Opcodes.MSTORE: cls._with_memory_expansion(
            gas_costs.OPCODE_MSTORE_BASE,
            memory_expansion_calculator,
        ),
        Opcodes.MSTORE8: cls._with_memory_expansion(
            gas_costs.OPCODE_MSTORE8_BASE,
            memory_expansion_calculator,
        ),
        Opcodes.SLOAD: lambda op: (
            gas_costs.WARM_SLOAD
            if op.metadata["key_warm"]
            else gas_costs.COLD_STORAGE_ACCESS
        ),
        Opcodes.SSTORE: lambda op: cls._calculate_sstore_gas(
            op, gas_costs
        ),
        Opcodes.JUMP: gas_costs.OPCODE_JUMP,
        Opcodes.JUMPI: gas_costs.OPCODE_JUMPI,
        Opcodes.PC: gas_costs.BASE,
        Opcodes.MSIZE: gas_costs.BASE,
        Opcodes.GAS: gas_costs.BASE,
        Opcodes.JUMPDEST: gas_costs.OPCODE_JUMPDEST,
        # Push operations (PUSH1 through PUSH32)
        **{
            getattr(Opcodes, f"PUSH{i}"): gas_costs.OPCODE_PUSH
            for i in range(1, 33)
        },
        # Dup operations (DUP1 through DUP16)
        **{
            getattr(Opcodes, f"DUP{i}"): gas_costs.OPCODE_DUP
            for i in range(1, 17)
        },
        # Swap operations (SWAP1 through SWAP16)
        **{
            getattr(Opcodes, f"SWAP{i}"): gas_costs.OPCODE_SWAP
            for i in range(1, 17)
        },
        # Logging operations
        Opcodes.LOG0: cls._with_memory_expansion(
            lambda op: (
                gas_costs.OPCODE_LOG_BASE
                + gas_costs.OPCODE_LOG_DATA_PER_BYTE
                * op.metadata["data_size"]
            ),
            memory_expansion_calculator,
        ),
        Opcodes.LOG1: cls._with_memory_expansion(
            lambda op: (
                gas_costs.OPCODE_LOG_BASE
                + gas_costs.OPCODE_LOG_DATA_PER_BYTE
                * op.metadata["data_size"]
                + gas_costs.OPCODE_LOG_TOPIC
            ),
            memory_expansion_calculator,
        ),
        Opcodes.LOG2: cls._with_memory_expansion(
            lambda op: (
                gas_costs.OPCODE_LOG_BASE
                + gas_costs.OPCODE_LOG_DATA_PER_BYTE
                * op.metadata["data_size"]
                + gas_costs.OPCODE_LOG_TOPIC * 2
            ),
            memory_expansion_calculator,
        ),
        Opcodes.LOG3: cls._with_memory_expansion(
            lambda op: (
                gas_costs.OPCODE_LOG_BASE
                + gas_costs.OPCODE_LOG_DATA_PER_BYTE
                * op.metadata["data_size"]
                + gas_costs.OPCODE_LOG_TOPIC * 3
            ),
            memory_expansion_calculator,
        ),
        Opcodes.LOG4: cls._with_memory_expansion(
            lambda op: (
                gas_costs.OPCODE_LOG_BASE
                + gas_costs.OPCODE_LOG_DATA_PER_BYTE
                * op.metadata["data_size"]
                + gas_costs.OPCODE_LOG_TOPIC * 4
            ),
            memory_expansion_calculator,
        ),
        # System operations
        Opcodes.CREATE: cls._with_memory_expansion(
            lambda op: cls._calculate_create_gas(op, gas_costs),
            memory_expansion_calculator,
        ),
        Opcodes.CALL: cls._with_memory_expansion(
            lambda op: cls._calculate_call_gas(op, gas_costs),
            memory_expansion_calculator,
        ),
        Opcodes.CALLCODE: cls._with_memory_expansion(
            lambda op: cls._calculate_call_gas(op, gas_costs),
            memory_expansion_calculator,
        ),
        Opcodes.RETURN: cls._with_memory_expansion(
            lambda op: cls._calculate_return_gas(op, gas_costs),
            memory_expansion_calculator,
        ),
        Opcodes.INVALID: 0,
        Opcodes.SELFDESTRUCT: lambda op: cls._calculate_selfdestruct_gas(
            op, gas_costs
        ),
    }

opcode_gas_calculator() classmethod

Return callable that calculates the gas cost of a single opcode.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def opcode_gas_calculator(cls) -> OpcodeGasCalculator:
    """
    Return callable that calculates the gas cost of a single opcode.
    """
    opcode_gas_map = cls.opcode_gas_map()

    def fn(opcode: OpcodeBase) -> int:
        # Get the gas cost or calculator
        if opcode not in opcode_gas_map:
            raise ValueError(
                f"No gas cost defined for opcode: {opcode._name_}"
            )
        gas_cost_or_calculator = opcode_gas_map[opcode]

        # If it's a callable, call it with the opcode
        if callable(gas_cost_or_calculator):
            return gas_cost_or_calculator(opcode)

        # Otherwise it's a constant
        return gas_cost_or_calculator

    return fn

opcode_refund_map() classmethod

Return a mapping of opcodes to their gas refunds.

Each entry is either: - Constants (int): Direct gas refund values - Callables: Functions that take the opcode instance with metadata and return gas refund

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def opcode_refund_map(
    cls,
) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
    """
    Return a mapping of opcodes to their gas refunds.

    Each entry is either:
    - Constants (int): Direct gas refund values
    - Callables: Functions that take the opcode instance with metadata and
                 return gas refund
    """
    gas_costs = cls.gas_costs()

    # Only SSTORE provides refunds
    return {
        Opcodes.SSTORE: lambda op: cls._calculate_sstore_refund(
            op, gas_costs
        ),
    }

opcode_refund_calculator() classmethod

Return callable that calculates the gas refund of a single opcode.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def opcode_refund_calculator(cls) -> OpcodeGasCalculator:
    """
    Return callable that calculates the gas refund of a single opcode.
    """
    opcode_refund_map = cls.opcode_refund_map()

    def fn(opcode: OpcodeBase) -> int:
        # Get the gas refund or calculator
        if opcode not in opcode_refund_map:
            # Most opcodes don't provide refunds
            return 0
        refund_or_calculator = opcode_refund_map[opcode]

        # If it's a callable, call it with the opcode
        if callable(refund_or_calculator):
            return refund_or_calculator(opcode)

        # Otherwise it's a constant
        return refund_or_calculator

    return fn

memory_expansion_gas_calculator() classmethod

Return callable that calculates the gas cost of memory expansion for the fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def memory_expansion_gas_calculator(cls) -> MemoryExpansionGasCalculator:
    """
    Return callable that calculates the gas cost of memory expansion for
    the fork.
    """
    gas_costs = cls.gas_costs()

    def fn(*, new_bytes: int, previous_bytes: int = 0) -> int:
        if new_bytes <= previous_bytes:
            return 0
        new_words = ceiling_division(new_bytes, 32)
        previous_words = ceiling_division(previous_bytes, 32)

        def c(w: int) -> int:
            return (gas_costs.MEMORY_PER_WORD * w) + ((w * w) // 512)

        return c(new_words) - c(previous_words)

    return fn

calldata_gas_calculator() classmethod

Return callable that calculates the transaction gas cost for its calldata depending on its contents.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def calldata_gas_calculator(cls) -> CalldataGasCalculator:
    """
    Return callable that calculates the transaction gas cost for its
    calldata depending on its contents.
    """
    gas_costs = cls.gas_costs()

    def fn(*, data: BytesConvertible, floor: bool = False) -> int:
        del floor

        raw = Bytes(data)
        num_zeros = raw.count(0)
        num_non_zeros = len(raw) - num_zeros
        return (
            num_zeros * gas_costs.TX_DATA_PER_ZERO
            + num_non_zeros * gas_costs.TX_DATA_PER_NON_ZERO
        )

    return fn

base_fee_per_gas_calculator() classmethod

Return a callable that calculates the base fee per gas at a given fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def base_fee_per_gas_calculator(cls) -> BaseFeePerGasCalculator:
    """
    Return a callable that calculates the base fee per gas at a given fork.
    """
    raise NotImplementedError(
        f"Base fee per gas calculator is not supported in {cls.name()}"
    )

base_fee_change_calculator() classmethod

Return a callable that calculates the gas that needs to be used to change the base fee.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def base_fee_change_calculator(cls) -> BaseFeeChangeCalculator:
    """
    Return a callable that calculates the gas that needs to be used to
    change the base fee.
    """
    raise NotImplementedError(
        f"Base fee change calculator is not supported in {cls.name()}"
    )

base_fee_max_change_denominator() classmethod

Return the base fee max change denominator at a given fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def base_fee_max_change_denominator(cls) -> int:
    """Return the base fee max change denominator at a given fork."""
    raise NotImplementedError(
        f"Base fee max change denominator is not supported in {cls.name()}"
    )

base_fee_elasticity_multiplier() classmethod

Return the base fee elasticity multiplier at a given fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def base_fee_elasticity_multiplier(cls) -> int:
    """Return the base fee elasticity multiplier at a given fork."""
    raise NotImplementedError(
        f"Base fee elasticity multiplier is not supported in {cls.name()}"
    )

transaction_data_floor_cost_calculator() classmethod

At frontier, the transaction data floor cost is a constant zero.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def transaction_data_floor_cost_calculator(
    cls,
) -> TransactionDataFloorCostCalculator:
    """At frontier, the transaction data floor cost is a constant zero."""

    def fn(*, data: BytesConvertible) -> int:
        del data
        return 0

    return fn

transaction_intrinsic_cost_calculator() classmethod

Return callable that calculates the intrinsic gas cost of a transaction for the fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def transaction_intrinsic_cost_calculator(
    cls,
) -> TransactionIntrinsicCostCalculator:
    """
    Return callable that calculates the intrinsic gas cost of a transaction
    for the fork.
    """
    gas_costs = cls.gas_costs()
    calldata_gas_calculator = cls.calldata_gas_calculator()

    def fn(
        *,
        calldata: BytesConvertible = b"",
        contract_creation: bool = False,
        access_list: List[AccessList] | None = None,
        authorization_list_or_count: Sized | int | None = None,
        return_cost_deducted_prior_execution: bool = False,
    ) -> int:
        del return_cost_deducted_prior_execution

        assert access_list is None, (
            f"Access list is not supported in {cls.name()}"
        )
        assert authorization_list_or_count is None, (
            f"Authorizations are not supported in {cls.name()}"
        )

        intrinsic_cost: int = gas_costs.TX_BASE

        if contract_creation:
            intrinsic_cost += (
                gas_costs.CODE_INIT_PER_WORD
                * ceiling_division(len(Bytes(calldata)), 32)
            )

        return intrinsic_cost + calldata_gas_calculator(data=calldata)

    return fn

blob_gas_price_calculator() classmethod

Return a callable that calculates the blob gas price at a given fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def blob_gas_price_calculator(cls) -> BlobGasPriceCalculator:
    """
    Return a callable that calculates the blob gas price at a given fork.
    """
    raise NotImplementedError(
        f"Blob gas price calculator is not supported in {cls.name()}"
    )

excess_blob_gas_calculator() classmethod

Return a callable that calculates the excess blob gas for a block at a given fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def excess_blob_gas_calculator(cls) -> ExcessBlobGasCalculator:
    """
    Return a callable that calculates the excess blob gas for a block at a
    given fork.
    """
    raise NotImplementedError(
        f"Excess blob gas calculator is not supported in {cls.name()}"
    )

supports_blobs() classmethod

Blobs are not supported at Frontier.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def supports_blobs(cls) -> bool:
    """Blobs are not supported at Frontier."""
    return False

blob_reserve_price_active() classmethod

Return whether the fork uses a reserve price mechanism for blobs or not.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def blob_reserve_price_active(cls) -> bool:
    """
    Return whether the fork uses a reserve price mechanism for blobs or
    not.
    """
    raise NotImplementedError(
        f"Blob reserve price is not supported in {cls.name()}"
    )

full_blob_tx_wrapper_version() classmethod

Return the version of the full blob transaction wrapper.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def full_blob_tx_wrapper_version(cls) -> int | None:
    """Return the version of the full blob transaction wrapper."""
    raise NotImplementedError(
        "Full blob transaction wrapper version is not supported in "
        f"{cls.name()}"
    )

blob_schedule() classmethod

At genesis, no blob schedule is used.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def blob_schedule(cls) -> BlobSchedule | None:
    """At genesis, no blob schedule is used."""
    return None

header_requests_required() classmethod

At genesis, header must not contain beacon chain requests.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def header_requests_required(cls) -> bool:
    """At genesis, header must not contain beacon chain requests."""
    return False

header_bal_hash_required() classmethod

At genesis, header must not contain block access list hash.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def header_bal_hash_required(cls) -> bool:
    """At genesis, header must not contain block access list hash."""
    return False

empty_block_bal_item_count() classmethod

Pre-Amsterdam forks have no block access list.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def empty_block_bal_item_count(cls) -> int:
    """Pre-Amsterdam forks have no block access list."""
    return 0

header_beacon_root_required() classmethod

At genesis, header must not contain parent beacon block root.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def header_beacon_root_required(cls) -> bool:
    """At genesis, header must not contain parent beacon block root."""
    return False

engine_new_payload_blob_hashes() classmethod

At genesis, payloads do not have blob hashes.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def engine_new_payload_blob_hashes(cls) -> bool:
    """At genesis, payloads do not have blob hashes."""
    return False

engine_new_payload_beacon_root() classmethod

At genesis, payloads do not have a parent beacon block root.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def engine_new_payload_beacon_root(cls) -> bool:
    """At genesis, payloads do not have a parent beacon block root."""
    return False

engine_new_payload_requests() classmethod

At genesis, payloads do not have requests.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def engine_new_payload_requests(cls) -> bool:
    """At genesis, payloads do not have requests."""
    return False

engine_execution_payload_block_access_list() classmethod

At genesis, payloads do not have block access list.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def engine_execution_payload_block_access_list(cls) -> bool:
    """At genesis, payloads do not have block access list."""
    return False

engine_new_payload_target_blobs_per_block() classmethod

At genesis, payloads do not have target blobs per block.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def engine_new_payload_target_blobs_per_block(cls) -> bool:
    """At genesis, payloads do not have target blobs per block."""
    return False

engine_payload_attribute_target_blobs_per_block() classmethod

At genesis, payload attributes do not include the target blobs per block.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def engine_payload_attribute_target_blobs_per_block(cls) -> bool:
    """
    At genesis, payload attributes do not include the target blobs per
    block.
    """
    return False

engine_payload_attribute_max_blobs_per_block() classmethod

At genesis, payload attributes do not include the max blobs per block.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def engine_payload_attribute_max_blobs_per_block(cls) -> bool:
    """
    At genesis, payload attributes do not include the max blobs per block.
    """
    return False

get_reward() classmethod

At Genesis the expected reward amount in wei is 5_000_000_000_000_000_000.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def get_reward(cls) -> int:
    """
    At Genesis the expected reward amount in wei is
    5_000_000_000_000_000_000.
    """
    return 5_000_000_000_000_000_000

supports_protected_txs() classmethod

At Genesis, fork has no support for EIP-155 protected txs.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def supports_protected_txs(cls) -> bool:
    """At Genesis, fork has no support for EIP-155 protected txs."""
    return False

tx_types() classmethod

At Genesis, only legacy transactions are allowed.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def tx_types(cls) -> List[int]:
    """At Genesis, only legacy transactions are allowed."""
    return [0]

contract_creating_tx_types() classmethod

At Genesis, only legacy transactions are allowed.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def contract_creating_tx_types(cls) -> List[int]:
    """At Genesis, only legacy transactions are allowed."""
    return [0]

transaction_gas_limit_cap() classmethod

At Genesis, no transaction gas limit cap is imposed.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def transaction_gas_limit_cap(cls) -> int | None:
    """At Genesis, no transaction gas limit cap is imposed."""
    return None

block_rlp_size_limit() classmethod

At Genesis, no RLP block size limit is imposed.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def block_rlp_size_limit(cls) -> int | None:
    """At Genesis, no RLP block size limit is imposed."""
    return None

precompiles() classmethod

At Genesis, EC-recover, SHA256, RIPEMD160, and Identity precompiles are introduced.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def precompiles(cls) -> List[Address]:
    """
    At Genesis, EC-recover, SHA256, RIPEMD160, and Identity precompiles
    are introduced.
    """
    return [
        Address(1, label="ECREC"),
        Address(2, label="SHA256"),
        Address(3, label="RIPEMD160"),
        Address(4, label="ID"),
    ]

system_contracts() classmethod

At Genesis, no system contracts are present.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def system_contracts(cls) -> List[Address]:
    """At Genesis, no system contracts are present."""
    return []

deterministic_factory_predeploy_address() classmethod

At Genesis, no deterministic factory predeploy is present.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def deterministic_factory_predeploy_address(cls) -> Address | None:
    """At Genesis, no deterministic factory predeploy is present."""
    return None

max_code_size() classmethod

At genesis, there is no upper bound for code size (bounded by block gas limit).

However, the default is set to the limit of EIP-170 (Spurious Dragon)

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def max_code_size(cls) -> int:
    """
    At genesis, there is no upper bound for code size (bounded by block gas
    limit).

    However, the default is set to the limit of EIP-170 (Spurious Dragon)
    """
    return 0x6000

max_stack_height() classmethod

At genesis, the maximum stack height is 1024.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def max_stack_height(cls) -> int:
    """At genesis, the maximum stack height is 1024."""
    return 1024

max_initcode_size() classmethod

At genesis, there is no upper bound for initcode size.

However, the default is set to the limit of EIP-3860 (Shanghai).

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def max_initcode_size(cls) -> int:
    """
    At genesis, there is no upper bound for initcode size.

    However, the default is set to the limit of EIP-3860 (Shanghai).
    """
    return 0xC000

call_opcodes() classmethod

Return list of call opcodes supported by the fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def call_opcodes(cls) -> List[Opcodes]:
    """Return list of call opcodes supported by the fork."""
    return [Opcodes.CALL, Opcodes.CALLCODE]

valid_opcodes() classmethod

Return list of Opcodes that are valid to work on this fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def valid_opcodes(cls) -> List[Opcodes]:
    """Return list of Opcodes that are valid to work on this fork."""
    return [
        Opcodes.STOP,
        Opcodes.ADD,
        Opcodes.MUL,
        Opcodes.SUB,
        Opcodes.DIV,
        Opcodes.SDIV,
        Opcodes.MOD,
        Opcodes.SMOD,
        Opcodes.ADDMOD,
        Opcodes.MULMOD,
        Opcodes.EXP,
        Opcodes.SIGNEXTEND,
        Opcodes.LT,
        Opcodes.GT,
        Opcodes.SLT,
        Opcodes.SGT,
        Opcodes.EQ,
        Opcodes.ISZERO,
        Opcodes.AND,
        Opcodes.OR,
        Opcodes.XOR,
        Opcodes.NOT,
        Opcodes.BYTE,
        Opcodes.SHA3,
        Opcodes.ADDRESS,
        Opcodes.BALANCE,
        Opcodes.ORIGIN,
        Opcodes.CALLER,
        Opcodes.CALLVALUE,
        Opcodes.CALLDATALOAD,
        Opcodes.CALLDATASIZE,
        Opcodes.CALLDATACOPY,
        Opcodes.CODESIZE,
        Opcodes.CODECOPY,
        Opcodes.GASPRICE,
        Opcodes.EXTCODESIZE,
        Opcodes.EXTCODECOPY,
        Opcodes.BLOCKHASH,
        Opcodes.COINBASE,
        Opcodes.TIMESTAMP,
        Opcodes.NUMBER,
        Opcodes.PREVRANDAO,
        Opcodes.GASLIMIT,
        Opcodes.POP,
        Opcodes.MLOAD,
        Opcodes.MSTORE,
        Opcodes.MSTORE8,
        Opcodes.SLOAD,
        Opcodes.SSTORE,
        Opcodes.PC,
        Opcodes.MSIZE,
        Opcodes.GAS,
        Opcodes.JUMP,
        Opcodes.JUMPI,
        Opcodes.JUMPDEST,
        Opcodes.PUSH1,
        Opcodes.PUSH2,
        Opcodes.PUSH3,
        Opcodes.PUSH4,
        Opcodes.PUSH5,
        Opcodes.PUSH6,
        Opcodes.PUSH7,
        Opcodes.PUSH8,
        Opcodes.PUSH9,
        Opcodes.PUSH10,
        Opcodes.PUSH11,
        Opcodes.PUSH12,
        Opcodes.PUSH13,
        Opcodes.PUSH14,
        Opcodes.PUSH15,
        Opcodes.PUSH16,
        Opcodes.PUSH17,
        Opcodes.PUSH18,
        Opcodes.PUSH19,
        Opcodes.PUSH20,
        Opcodes.PUSH21,
        Opcodes.PUSH22,
        Opcodes.PUSH23,
        Opcodes.PUSH24,
        Opcodes.PUSH25,
        Opcodes.PUSH26,
        Opcodes.PUSH27,
        Opcodes.PUSH28,
        Opcodes.PUSH29,
        Opcodes.PUSH30,
        Opcodes.PUSH31,
        Opcodes.PUSH32,
        Opcodes.DUP1,
        Opcodes.DUP2,
        Opcodes.DUP3,
        Opcodes.DUP4,
        Opcodes.DUP5,
        Opcodes.DUP6,
        Opcodes.DUP7,
        Opcodes.DUP8,
        Opcodes.DUP9,
        Opcodes.DUP10,
        Opcodes.DUP11,
        Opcodes.DUP12,
        Opcodes.DUP13,
        Opcodes.DUP14,
        Opcodes.DUP15,
        Opcodes.DUP16,
        Opcodes.SWAP1,
        Opcodes.SWAP2,
        Opcodes.SWAP3,
        Opcodes.SWAP4,
        Opcodes.SWAP5,
        Opcodes.SWAP6,
        Opcodes.SWAP7,
        Opcodes.SWAP8,
        Opcodes.SWAP9,
        Opcodes.SWAP10,
        Opcodes.SWAP11,
        Opcodes.SWAP12,
        Opcodes.SWAP13,
        Opcodes.SWAP14,
        Opcodes.SWAP15,
        Opcodes.SWAP16,
        Opcodes.LOG0,
        Opcodes.LOG1,
        Opcodes.LOG2,
        Opcodes.LOG3,
        Opcodes.LOG4,
        Opcodes.CREATE,
        Opcodes.CALL,
        Opcodes.CALLCODE,
        Opcodes.RETURN,
        Opcodes.SELFDESTRUCT,
    ]

create_opcodes() classmethod

At Genesis, only CREATE opcode is supported.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def create_opcodes(cls) -> List[Opcodes]:
    """At Genesis, only `CREATE` opcode is supported."""
    return [Opcodes.CREATE]

max_refund_quotient() classmethod

Return the max refund quotient at Genesis.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def max_refund_quotient(cls) -> int:
    """Return the max refund quotient at Genesis."""
    return 2

max_request_type() classmethod

At genesis, no request type is supported, signaled by -1.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def max_request_type(cls) -> int:
    """At genesis, no request type is supported, signaled by -1."""
    return -1

pre_allocation() classmethod

Return whether the fork expects pre-allocation of accounts.

Frontier does not require pre-allocated accounts

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def pre_allocation(cls) -> Mapping:
    """
    Return whether the fork expects pre-allocation of accounts.

    Frontier does not require pre-allocated accounts
    """
    return {}

pre_allocation_blockchain() classmethod

Return whether the fork expects pre-allocation of accounts.

Frontier does not require pre-allocated accounts

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def pre_allocation_blockchain(cls) -> Mapping:
    """
    Return whether the fork expects pre-allocation of accounts.

    Frontier does not require pre-allocated accounts
    """
    return {}

build_default_block_header(*, block_number=0, timestamp=0) classmethod

Build a default block header for this fork with the given attributes.

This method automatically detects which header fields are required by the fork and assigns appropriate default values. It introspects the FixtureHeader model to find fields with HeaderForkRequirement annotations and automatically includes them if the fork requires them.

Parameters:

Name	Type	Description	Default
block_number	int	The block number	0
timestamp	int	The block timestamp	0

Returns:

Type	Description
FixtureHeader	FixtureHeader instance with default values applied based on fork
FixtureHeader	requirements.

Raises:

Type	Description
TypeError	If the overrides don't have the correct type.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

@classmethod
def build_default_block_header(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> FixtureHeader:
    """
    Build a default block header for this fork with the given attributes.

    This method automatically detects which header fields are required by
    the fork and assigns appropriate default values. It introspects the
    FixtureHeader model to find fields with HeaderForkRequirement
    annotations and automatically includes them if the fork requires them.

    Args:
        block_number: The block number
        timestamp: The block timestamp

    Returns:
        FixtureHeader instance with default values applied based on fork
        requirements.

    Raises:
        TypeError: If the overrides don't have the correct type.

    """
    from execution_testing.fixtures.blockchain import FixtureHeader

    defaults = {
        "number": ZeroPaddedHexNumber(block_number),
        "timestamp": ZeroPaddedHexNumber(timestamp),
        "fork": cls,
    }

    # Iterate through FixtureHeader fields to populate defaults
    for field_name, field_info in FixtureHeader.model_fields.items():
        if field_name in defaults:
            continue

        # Get default value, checking fork requirements and model defaults
        default_value = FixtureHeader.get_default_from_annotation(
            fork=cls,
            field_name=field_name,
            field_hint=field_info.annotation,
        )
        if default_value is not None:
            defaults[field_name] = default_value

    return FixtureHeader(**defaults)

GrayGlacier

Bases: ArrowGlacier

Gray Glacier fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class GrayGlacier(
    ArrowGlacier,
    solc_name="london",
    ignore=True,
):
    """Gray Glacier fork."""

    pass

Homestead

Bases: EIP7, EIP2, Frontier

Homestead fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class Homestead(
    eips.EIP7,
    eips.EIP2,
    Frontier,
):
    """Homestead fork."""

    pass

Istanbul

Bases: EIP2028, EIP1884, EIP1344, EIP1108, EIP152, ConstantinopleFix

Istanbul fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class Istanbul(
    eips.EIP2028,
    eips.EIP1884,
    eips.EIP1344,
    eips.EIP1108,
    eips.EIP152,
    ConstantinopleFix,
):
    """Istanbul fork."""

    pass

London

Bases: EIP3529, EIP3198, EIP1559, Berlin

London fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class London(
    eips.EIP3529,
    eips.EIP3198,
    eips.EIP1559,
    Berlin,
):
    """London fork."""

    pass

MuirGlacier

Bases: Istanbul

Muir Glacier fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class MuirGlacier(
    Istanbul,
    solc_name="istanbul",
    ignore=True,
):
    """Muir Glacier fork."""

    pass

Osaka

Bases: EIP7939, EIP7934, EIP7825, EIP7918, EIP7594, EIP7951, Prague

Osaka fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class Osaka(
    eips.EIP7939,
    eips.EIP7934,
    eips.EIP7825,
    eips.EIP7918,
    eips.EIP7594,
    eips.EIP7951,
    Prague,
    solc_name="cancun",
):
    """Osaka fork."""

    pass

Paris

Bases: EIP3675, London

Paris (Merge) fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class Paris(
    eips.EIP3675,
    London,
    transition_tool_name="Merge",
    ruleset_name="MERGE",
):
    """Paris (Merge) fork."""

    pass

Prague

Bases: EIP7691, EIP7685, EIP2935, EIP7251, EIP7002, EIP6110, EIP7623, EIP7702, EIP2537, Cancun

Prague fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class Prague(
    eips.EIP7691,
    eips.EIP7685,
    eips.EIP2935,
    eips.EIP7251,
    eips.EIP7002,
    eips.EIP6110,
    eips.EIP7623,
    eips.EIP7702,
    eips.EIP2537,
    Cancun,
):
    """Prague fork."""

    pass

Shanghai

Bases: EIP3855, EIP3860, EIP4895, Paris

Shanghai fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class Shanghai(
    eips.EIP3855,
    eips.EIP3860,
    eips.EIP4895,
    Paris,
    fork_by_timestamp=True,
):
    """Shanghai fork."""

    pass

SpuriousDragon

Bases: EIP170, EIP161, EIP155, TangerineWhistle

SpuriousDragon fork.

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class SpuriousDragon(
    eips.EIP170,
    eips.EIP161,
    eips.EIP155,
    TangerineWhistle,
    ignore=True,
    ruleset_name="SPURIOUS",
):
    """SpuriousDragon fork."""

    pass

TangerineWhistle

Bases: DAOFork

TangerineWhistle fork (EIP-150).

Source code in packages/testing/src/execution_testing/forks/forks/forks.py

class TangerineWhistle(
    DAOFork,
    ignore=True,
    ruleset_name="TANGERINE",
):
    """TangerineWhistle fork (EIP-150)."""

    pass

BerlinToLondonAt5

Bases: TransitionBaseClass

Berlin to London transition at Block 5.

Source code in packages/testing/src/execution_testing/forks/forks/transition.py

@transition_fork(to_fork=London, from_fork=Berlin, at_block=5)
class BerlinToLondonAt5(TransitionBaseClass):
    """Berlin to London transition at Block 5."""

    pass

BPO1ToBPO2AtTime15k

Bases: TransitionBaseClass

BPO1 to BPO2 transition at Timestamp 15k.

Source code in packages/testing/src/execution_testing/forks/forks/transition.py

@transition_fork(to_fork=BPO2, from_fork=BPO1, at_timestamp=15_000)
class BPO1ToBPO2AtTime15k(TransitionBaseClass):
    """BPO1 to BPO2 transition at Timestamp 15k."""

    pass

BPO2ToAmsterdamAtTime15k

Bases: TransitionBaseClass

BPO2 to Amsterdam transition at Timestamp 15k.

Source code in packages/testing/src/execution_testing/forks/forks/transition.py

@transition_fork(to_fork=Amsterdam, from_fork=BPO2, at_timestamp=15_000)
class BPO2ToAmsterdamAtTime15k(TransitionBaseClass):
    """BPO2 to Amsterdam transition at Timestamp 15k."""

    # TODO: We may need to adjust which BPO Amsterdam inherits from as the
    #  related Amsterdam specs change over time, and before Amsterdam is
    #  live on mainnet.

    pass

BPO2ToBPO3AtTime15k

Bases: TransitionBaseClass

BPO2 to BPO3 transition at Timestamp 15k.

Source code in packages/testing/src/execution_testing/forks/forks/transition.py

@transition_fork(to_fork=BPO3, from_fork=BPO2, at_timestamp=15_000)
class BPO2ToBPO3AtTime15k(TransitionBaseClass):
    """BPO2 to BPO3 transition at Timestamp 15k."""

    pass

BPO3ToBPO4AtTime15k

Bases: TransitionBaseClass

BPO3 to BPO4 transition at Timestamp 15k.

Source code in packages/testing/src/execution_testing/forks/forks/transition.py

@transition_fork(to_fork=BPO4, from_fork=BPO3, at_timestamp=15_000)
class BPO3ToBPO4AtTime15k(TransitionBaseClass):
    """BPO3 to BPO4 transition at Timestamp 15k."""

    pass

CancunToPragueAtTime15k

Bases: TransitionBaseClass

Cancun to Prague transition at Timestamp 15k.

Source code in packages/testing/src/execution_testing/forks/forks/transition.py

@transition_fork(to_fork=Prague, from_fork=Cancun, at_timestamp=15_000)
class CancunToPragueAtTime15k(TransitionBaseClass):
    """Cancun to Prague transition at Timestamp 15k."""

    pass

OsakaToBPO1AtTime15k

Bases: TransitionBaseClass

Osaka to BPO1 transition at Timestamp 15k.

Source code in packages/testing/src/execution_testing/forks/forks/transition.py

@transition_fork(to_fork=BPO1, from_fork=Osaka, at_timestamp=15_000)
class OsakaToBPO1AtTime15k(TransitionBaseClass):
    """Osaka to BPO1 transition at Timestamp 15k."""

    pass

ParisToShanghaiAtTime15k

Bases: TransitionBaseClass

Paris to Shanghai transition at Timestamp 15k.

Source code in packages/testing/src/execution_testing/forks/forks/transition.py

@transition_fork(to_fork=Shanghai, from_fork=Paris, at_timestamp=15_000)
class ParisToShanghaiAtTime15k(TransitionBaseClass):
    """Paris to Shanghai transition at Timestamp 15k."""

    pass

PragueToOsakaAtTime15k

Bases: TransitionBaseClass

Prague to Osaka transition at Timestamp 15k.

Source code in packages/testing/src/execution_testing/forks/forks/transition.py

@transition_fork(to_fork=Osaka, from_fork=Prague, at_timestamp=15_000)
class PragueToOsakaAtTime15k(TransitionBaseClass):
    """Prague to Osaka transition at Timestamp 15k."""

    pass

ShanghaiToCancunAtTime15k

Bases: TransitionBaseClass

Shanghai to Cancun transition at Timestamp 15k.

Source code in packages/testing/src/execution_testing/forks/forks/transition.py

@transition_fork(to_fork=Cancun, from_fork=Shanghai, at_timestamp=15_000)
class ShanghaiToCancunAtTime15k(TransitionBaseClass):
    """Shanghai to Cancun transition at Timestamp 15k."""

    pass

GasCosts dataclass

Class that contains the gas cost constants for any fork.

Source code in packages/testing/src/execution_testing/forks/gas_costs.py

@dataclass(kw_only=True, frozen=True)
class GasCosts:
    """Class that contains the gas cost constants for any fork."""

    # Tiers
    BASE: int
    VERY_LOW: int
    LOW: int
    MID: int
    HIGH: int

    # Access
    WARM_ACCESS: int
    COLD_ACCOUNT_ACCESS: int
    WARM_SLOAD: int
    COLD_STORAGE_ACCESS: int

    # Storage
    STORAGE_SET: int
    COLD_STORAGE_WRITE: int
    STORAGE_RESET: int

    # Call
    CALL_VALUE: int
    CALL_STIPEND: int
    NEW_ACCOUNT: int

    # Contract Creation
    CODE_DEPOSIT_PER_BYTE: int
    CODE_INIT_PER_WORD: int

    # Authorization
    AUTH_PER_EMPTY_ACCOUNT: int

    # Utility
    MEMORY_PER_WORD: int

    # Transactions
    TX_BASE: int
    TX_CREATE: int
    TX_DATA_PER_ZERO: int
    TX_DATA_PER_NON_ZERO: int
    TX_DATA_TOKEN_STANDARD: int
    TX_DATA_TOKEN_FLOOR: int
    TX_ACCESS_LIST_ADDRESS: int
    TX_ACCESS_LIST_STORAGE_KEY: int

    # Refunds
    REFUND_STORAGE_CLEAR: int
    REFUND_AUTH_PER_EXISTING_ACCOUNT: int

    # Precompiles
    PRECOMPILE_ECRECOVER: int
    PRECOMPILE_SHA256_BASE: int
    PRECOMPILE_SHA256_PER_WORD: int
    PRECOMPILE_RIPEMD160_BASE: int
    PRECOMPILE_RIPEMD160_PER_WORD: int
    PRECOMPILE_IDENTITY_BASE: int
    PRECOMPILE_IDENTITY_PER_WORD: int
    PRECOMPILE_ECADD: int
    PRECOMPILE_ECMUL: int
    PRECOMPILE_ECPAIRING_BASE: int
    PRECOMPILE_ECPAIRING_PER_POINT: int
    PRECOMPILE_BLAKE2F_BASE: int
    PRECOMPILE_BLAKE2F_PER_ROUND: int
    PRECOMPILE_POINT_EVALUATION: int
    PRECOMPILE_BLS_G1ADD: int
    PRECOMPILE_BLS_G1MUL: int
    PRECOMPILE_BLS_G1MAP: int
    PRECOMPILE_BLS_G2ADD: int
    PRECOMPILE_BLS_G2MUL: int
    PRECOMPILE_BLS_G2MAP: int
    PRECOMPILE_BLS_PAIRING_BASE: int
    PRECOMPILE_BLS_PAIRING_PER_PAIR: int
    PRECOMPILE_P256VERIFY: int

    # Block Access Lists
    BLOCK_ACCESS_LIST_ITEM: int

    # Opcodes
    OPCODE_ADD: int
    OPCODE_SUB: int
    OPCODE_MUL: int
    OPCODE_DIV: int
    OPCODE_SDIV: int
    OPCODE_MOD: int
    OPCODE_SMOD: int
    OPCODE_ADDMOD: int
    OPCODE_MULMOD: int
    OPCODE_SIGNEXTEND: int
    OPCODE_LT: int
    OPCODE_GT: int
    OPCODE_SLT: int
    OPCODE_SGT: int
    OPCODE_EQ: int
    OPCODE_ISZERO: int
    OPCODE_AND: int
    OPCODE_OR: int
    OPCODE_XOR: int
    OPCODE_NOT: int
    OPCODE_BYTE: int
    OPCODE_JUMP: int
    OPCODE_JUMPI: int
    OPCODE_JUMPDEST: int
    OPCODE_CALLDATALOAD: int
    OPCODE_BLOCKHASH: int
    OPCODE_COINBASE: int
    OPCODE_PUSH: int
    OPCODE_DUP: int
    OPCODE_SWAP: int

    # Dynamic Opcode Components
    OPCODE_CALLDATACOPY_BASE: int
    OPCODE_CODECOPY_BASE: int
    OPCODE_MLOAD_BASE: int
    OPCODE_MSTORE_BASE: int
    OPCODE_MSTORE8_BASE: int
    OPCODE_SELFDESTRUCT_BASE: int
    OPCODE_COPY_PER_WORD: int
    OPCODE_CREATE_BASE: int
    OPCODE_EXP_BASE: int
    OPCODE_EXP_PER_BYTE: int
    OPCODE_LOG_BASE: int
    OPCODE_LOG_DATA_PER_BYTE: int
    OPCODE_LOG_TOPIC: int
    OPCODE_KECCAK256_BASE: int
    OPCODE_KECCACK256_PER_WORD: int

    # Defined post-Frontier
    OPCODE_SHL: int = 0
    OPCODE_SHR: int = 0
    OPCODE_SAR: int = 0
    OPCODE_RETURNDATACOPY_BASE: int = 0
    OPCODE_BLOBHASH: int = 0
    OPCODE_MCOPY_BASE: int = 0
    OPCODE_CLZ: int = 0

ForkRangeDescriptor

Bases: BaseModel

Fork descriptor parsed from string normally contained in ethereum/tests fillers.

Source code in packages/testing/src/execution_testing/forks/helpers.py

class ForkRangeDescriptor(BaseModel):
    """
    Fork descriptor parsed from string normally contained in ethereum/tests
    fillers.
    """

    greater_equal: Type[BaseFork] | None = None
    less_than: Type[BaseFork] | None = None
    model_config = ConfigDict(frozen=True)

    def fork_in_range(self, fork: Type[BaseFork]) -> bool:
        """Return whether the given fork is within range."""
        if self.greater_equal is not None and fork < self.greater_equal:
            return False
        if self.less_than is not None and fork >= self.less_than:
            return False
        return True

    @model_validator(mode="wrap")
    @classmethod
    def validate_fork_range_descriptor(
        cls, v: Any, handler: ValidatorFunctionWrapHandler
    ) -> "ForkRangeDescriptor":
        """
        Validate the fork range descriptor from a string.

        Examples:
          - ">=Osaka" validates to {greater_equal=Osaka, less_than=None}

          - ">=Prague<Osaka" validates to {greater_equal=Prague,
                                           less_than=Osaka}

        """
        if isinstance(v, str):
            # Decompose the string into its parts
            descriptor_string = re.sub(r"\s+", "", v.strip())
            v = {}
            if m := re.search(r">=(\w+)", descriptor_string):
                fork: Type[BaseFork] | None = get_fork_by_name(m.group(1))
                if fork is None:
                    raise Exception(f"Unable to parse fork name: {m.group(1)}")
                v["greater_equal"] = fork
                descriptor_string = re.sub(r">=(\w+)", "", descriptor_string)
            if m := re.search(r"<(\w+)", descriptor_string):
                fork = get_fork_by_name(m.group(1))
                if fork is None:
                    raise Exception(f"Unable to parse fork name: {m.group(1)}")
                v["less_than"] = fork
                descriptor_string = re.sub(r"<(\w+)", "", descriptor_string)
            if descriptor_string:
                raise Exception(
                    "Unable to completely parse fork range descriptor. "
                    + f'Remaining string: "{descriptor_string}"'
                )
        return handler(v)

fork_in_range(fork)

Return whether the given fork is within range.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def fork_in_range(self, fork: Type[BaseFork]) -> bool:
    """Return whether the given fork is within range."""
    if self.greater_equal is not None and fork < self.greater_equal:
        return False
    if self.less_than is not None and fork >= self.less_than:
        return False
    return True

validate_fork_range_descriptor(v, handler) classmethod

Validate the fork range descriptor from a string.

Examples:

• ">=Osaka" validates to {greater_equal=Osaka, less_than=None}

• ">=Prague

Source code in packages/testing/src/execution_testing/forks/helpers.py

@model_validator(mode="wrap")
@classmethod
def validate_fork_range_descriptor(
    cls, v: Any, handler: ValidatorFunctionWrapHandler
) -> "ForkRangeDescriptor":
    """
    Validate the fork range descriptor from a string.

    Examples:
      - ">=Osaka" validates to {greater_equal=Osaka, less_than=None}

      - ">=Prague<Osaka" validates to {greater_equal=Prague,
                                       less_than=Osaka}

    """
    if isinstance(v, str):
        # Decompose the string into its parts
        descriptor_string = re.sub(r"\s+", "", v.strip())
        v = {}
        if m := re.search(r">=(\w+)", descriptor_string):
            fork: Type[BaseFork] | None = get_fork_by_name(m.group(1))
            if fork is None:
                raise Exception(f"Unable to parse fork name: {m.group(1)}")
            v["greater_equal"] = fork
            descriptor_string = re.sub(r">=(\w+)", "", descriptor_string)
        if m := re.search(r"<(\w+)", descriptor_string):
            fork = get_fork_by_name(m.group(1))
            if fork is None:
                raise Exception(f"Unable to parse fork name: {m.group(1)}")
            v["less_than"] = fork
            descriptor_string = re.sub(r"<(\w+)", "", descriptor_string)
        if descriptor_string:
            raise Exception(
                "Unable to completely parse fork range descriptor. "
                + f'Remaining string: "{descriptor_string}"'
            )
    return handler(v)

InvalidForkError

Bases: Exception

Invalid fork error raised when the fork specified is not found or incompatible.

Source code in packages/testing/src/execution_testing/forks/helpers.py

class InvalidForkError(Exception):
    """
    Invalid fork error raised when the fork specified is not found or
    incompatible.
    """

    def __init__(self, message: str) -> None:
        """Initialize the InvalidForkError exception."""
        super().__init__(message)

__init__(message)

Initialize the InvalidForkError exception.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def __init__(self, message: str) -> None:
    """Initialize the InvalidForkError exception."""
    super().__init__(message)

forks_from(fork, deployed_only=True)

Return specified fork and all forks after it.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def forks_from(
    fork: Type[BaseFork], deployed_only: bool = True
) -> List[Type[BaseFork]]:
    """Return specified fork and all forks after it."""
    if deployed_only:
        latest_fork = get_deployed_forks()[-1]
    else:
        latest_fork = get_forks()[-1]
    return forks_from_until(fork, latest_fork)

forks_from_until(fork_from, fork_until)

Return specified fork and all forks after it until and including the second specified fork.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def forks_from_until(
    fork_from: Type[BaseFork], fork_until: Type[BaseFork]
) -> List[Type[BaseFork]]:
    """
    Return specified fork and all forks after it until and including the second
    specified fork.
    """
    prev_fork: Type[BaseFork] | None = fork_until

    forks: List[Type[BaseFork]] = []

    while prev_fork is not None and prev_fork != fork_from:
        forks.insert(0, prev_fork)

        prev_fork = prev_fork.parent()

    if prev_fork == BaseFork:
        return []

    forks.insert(0, fork_from)

    return forks

get_closest_fork(fork)

Return None if BaseFork is passed, otherwise return the fork itself.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_closest_fork(fork: Type[BaseFork]) -> Optional[Type[BaseFork]]:
    """Return None if BaseFork is passed, otherwise return the fork itself."""
    if fork is BaseFork:
        return None
    return fork

get_deployed_forks()

Return all fork classes that have been deployed to mainnet.

Chronologically ordered by deployment. BPO (Blob Parameter Only) forks are excluded as they are handled separately.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_deployed_forks() -> List[Type[BaseFork]]:
    """
    Return all fork classes that have been deployed to mainnet.

    Chronologically ordered by deployment. BPO (Blob Parameter Only) forks
    are excluded as they are handled separately.
    """
    return [
        fork
        for fork in get_forks()
        if fork.is_deployed() and not fork.ignore() and not fork.bpo_fork()
    ]

get_development_forks()

Return all fork classes not yet deployed and under development.

The list is ordered by their planned deployment date.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_development_forks() -> List[Type[BaseFork]]:
    """
    Return all fork classes not yet deployed and under development.

    The list is ordered by their planned deployment date.
    """
    return [fork for fork in get_forks() if not fork.is_deployed()]

get_fork_by_name(fork_name)

Get a fork by name.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_fork_by_name(fork_name: str) -> Type[BaseFork] | None:
    """Get a fork by name."""
    for fork in get_forks():
        if fork.name() == fork_name:
            return fork
    return None

get_forks()

Return all fork classes implemented by execution_testing.forks.

Ordered chronologically by deployment.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_forks() -> List[Type[BaseFork]]:
    """
    Return all fork classes implemented by `execution_testing.forks`.

    Ordered chronologically by deployment.
    """
    return all_forks[:]

get_forks_with_no_descendants(forks)

Get forks with no descendants in the inheritance hierarchy.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_forks_with_no_descendants(
    forks: Set[Type[BaseFork]],
) -> Set[Type[BaseFork]]:
    """Get forks with no descendants in the inheritance hierarchy."""
    resulting_forks: Set[Type[BaseFork]] = set()
    for fork in forks:
        descendants = False
        for next_fork in forks - {fork}:
            if next_fork > fork:
                descendants = True
                break
        if not descendants:
            resulting_forks = resulting_forks | {fork}
    return resulting_forks

get_forks_with_no_parents(forks)

Get forks with no parents in the inheritance hierarchy.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_forks_with_no_parents(
    forks: Set[Type[BaseFork]] | FrozenSet[Type[BaseFork]],
) -> Set[Type[BaseFork]]:
    """Get forks with no parents in the inheritance hierarchy."""
    resulting_forks: Set[Type[BaseFork]] = set()
    for fork in forks:
        parents = False
        for next_fork in forks - {fork}:
            if next_fork < fork:
                parents = True
                break
        if not parents:
            resulting_forks = resulting_forks | {fork}
    return resulting_forks

get_from_until_fork_set(forks, forks_from, forks_until)

Get fork range from forks_from to forks_until.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_from_until_fork_set(
    forks: Set[Type[BaseFork]] | FrozenSet[Type[BaseFork]],
    forks_from: Set[Type[BaseFork]],
    forks_until: Set[Type[BaseFork]],
) -> Set[Type[BaseFork]]:
    """Get fork range from forks_from to forks_until."""
    resulting_set = set()
    for fork_from in forks_from:
        for fork_until in forks_until:
            for fork in forks:
                if fork <= fork_until and fork >= fork_from:
                    resulting_set.add(fork)
    return resulting_set

get_last_descendants(forks, forks_from)

Get last descendant of a class in the inheritance hierarchy.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_last_descendants(
    forks: Set[Type[BaseFork]], forks_from: Set[Type[BaseFork]]
) -> Set[Type[BaseFork]]:
    """Get last descendant of a class in the inheritance hierarchy."""
    resulting_forks: Set[Type[BaseFork]] = set()
    forks = get_forks_with_no_descendants(forks)
    for fork_from in forks_from:
        for fork in forks:
            if fork >= fork_from:
                resulting_forks = resulting_forks | {fork}
    return resulting_forks

get_relative_fork_markers(fork_identifier, strict_mode=True)

Return a list of marker names for a given fork.

For a base fork (e.g. Shanghai), return [ Shanghai ]. For a transition fork (e.g. ShanghaiToCancunAtTime15k which transitions to Cancun), return [ ShanghaiToCancunAtTime15k, Cancun ].

If strict_mode is set to True, raise an InvalidForkError if the fork is not found, otherwise, simply return the provided (str) fork_identifier (this is required to run consume with forks that are unknown to EEST).

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_relative_fork_markers(
    fork_identifier: Type[BaseFork] | str, strict_mode: bool = True
) -> list[str]:
    """
    Return a list of marker names for a given fork.

    For a base fork (e.g. `Shanghai`), return [ `Shanghai` ]. For a transition
    fork (e.g. `ShanghaiToCancunAtTime15k` which transitions to `Cancun`),
    return [ `ShanghaiToCancunAtTime15k`, `Cancun` ].

    If `strict_mode` is set to `True`, raise an `InvalidForkError` if the fork
    is not found, otherwise, simply return the provided (str) `fork_identifier`
    (this is required to run `consume` with forks that are unknown to EEST).
    """
    all_forks = set(get_forks()) | set(get_transition_forks())
    if isinstance(fork_identifier, str):
        fork_class = None
        for candidate in all_forks:
            if candidate.name() == fork_identifier:
                fork_class = candidate
                break
        if strict_mode and fork_class is None:
            raise InvalidForkError(f"Unknown fork: {fork_identifier}")
        return [fork_identifier]
    else:
        fork_class = fork_identifier

    if issubclass(fork_class, TransitionBaseClass):
        return [fork_class.name(), fork_class.transitions_to().name()]
    else:
        return [fork_class.name()]

get_selected_fork_set(*, single_fork, forks_from, forks_until, transition_forks=True)

Process sets derived from --fork, --until and --from to return an unified fork set.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_selected_fork_set(
    *,
    single_fork: Set[Type[BaseFork]],
    forks_from: Set[Type[BaseFork]],
    forks_until: Set[Type[BaseFork]],
    transition_forks: bool = True,
) -> Set[Type[BaseFork | TransitionBaseClass]]:
    """
    Process sets derived from `--fork`, `--until` and `--from` to return an
    unified fork set.
    """
    selected_fork_set: Set[Type[BaseFork]] = set()
    if single_fork:
        selected_fork_set |= single_fork
    else:
        if not forks_from:
            forks_from = get_forks_with_no_parents(ALL_FORKS)
        if not forks_until:
            forks_until = get_last_descendants(
                set(get_deployed_forks()), forks_from
            )
        selected_fork_set |= get_from_until_fork_set(
            ALL_FORKS, forks_from, forks_until
        )
        # Transition fork comparison operators resolve to
        # transitions_to(), so an --until transition fork boundary
        # incorrectly includes its target in the normal fork set.
        for fork_until in forks_until:
            if issubclass(fork_until, TransitionBaseClass):
                selected_fork_set.discard(fork_until.transitions_to())
    selected_fork_set_with_transitions: Set[
        Type[BaseFork | TransitionBaseClass]
    ] = set() | selected_fork_set
    if transition_forks:
        for normal_fork in list(selected_fork_set):
            transition_fork_set = transition_fork_to(normal_fork)
            selected_fork_set_with_transitions |= transition_fork_set
        # Explicitly add transition fork boundaries whose target fork
        # was removed above (transition_fork_to won't find them).
        if not single_fork:
            for fork in forks_from | forks_until:
                if issubclass(fork, TransitionBaseClass):
                    selected_fork_set_with_transitions.add(fork)
    return selected_fork_set_with_transitions

get_transition_fork_predecessor(transition_fork)

Return the fork from which the transition fork transitions.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_transition_fork_predecessor(
    transition_fork: Type[BaseFork | TransitionBaseClass],
) -> Type[BaseFork]:
    """Return the fork from which the transition fork transitions."""
    if not issubclass(transition_fork, TransitionBaseClass):
        raise InvalidForkError(f"{transition_fork} is not a transition fork.")
    return transition_fork.transitions_from()

get_transition_fork_successor(transition_fork)

Return the fork to which the transition fork transitions.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_transition_fork_successor(
    transition_fork: Type[BaseFork],
) -> Type[BaseFork]:
    """Return the fork to which the transition fork transitions."""
    if not issubclass(transition_fork, TransitionBaseClass):
        raise InvalidForkError(f"{transition_fork} is not a transition fork.")
    return transition_fork.transitions_to()

get_transition_forks()

Return all the transition forks.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def get_transition_forks() -> Set[Type[TransitionBaseClass]]:
    """Return all the transition forks."""
    return set(ALL_TRANSITION_FORKS)

transition_fork_from_to(fork_from, fork_to)

Return transition fork that transitions to and from the specified forks.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def transition_fork_from_to(
    fork_from: Type[BaseFork], fork_to: Type[BaseFork]
) -> Type[TransitionBaseClass] | None:
    """
    Return transition fork that transitions to and from the specified forks.
    """
    for transition_fork in get_transition_forks():
        if not issubclass(transition_fork, TransitionBaseClass):
            continue
        if (
            transition_fork.transitions_to() == fork_to
            and transition_fork.transitions_from() == fork_from
        ):
            return transition_fork

    return None

transition_fork_to(fork_to)

Return transition fork that transitions to the specified fork.

Source code in packages/testing/src/execution_testing/forks/helpers.py

def transition_fork_to(
    fork_to: Type[BaseFork | TransitionBaseClass],
) -> Set[Type[TransitionBaseClass]]:
    """Return transition fork that transitions to the specified fork."""
    selected_forks: Set[Type[TransitionBaseClass]] = set()
    if issubclass(fork_to, TransitionBaseClass):
        return selected_forks
    for transition_fork in get_transition_forks():
        if not issubclass(transition_fork, TransitionBaseClass):
            continue
        if transition_fork.transitions_to() == fork_to:
            selected_forks.add(transition_fork)

    return selected_forks