Ethereum Test Forks package

Ethereum test fork definitions.

ForkAttribute

Bases: Protocol

A protocol to get the attribute of a fork at a given block number and timestamp.

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

class ForkAttribute(Protocol):
    """
    A protocol to get the attribute of a fork at a given block number and
    timestamp.
    """

    def __call__(self, block_number: int = 0, timestamp: int = 0) -> Any:
        """
        Return value of the attribute at the given block number and timestamp.
        """
        pass

__call__(block_number=0, timestamp=0)

Return value of the attribute at the given block number and timestamp.

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

def __call__(self, block_number: int = 0, timestamp: int = 0) -> Any:
    """
    Return value of the attribute at the given block number and timestamp.
    """
    pass

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):
    """Mainnet BPO1 fork - Blob Parameter Only fork 1."""

    @classmethod
    def blob_base_fee_update_fraction(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the blob base fee update fraction for BPO1."""
        del block_number, timestamp
        return 8346193

    @classmethod
    def target_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Blobs in BPO1 have a target of 10 blobs per block."""
        del block_number, timestamp
        return 10

    @classmethod
    def max_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Blobs in BPO1 have a max of 15 blobs per block."""
        del block_number, timestamp
        return 15

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

Return the blob base fee update fraction for BPO1.

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

@classmethod
def blob_base_fee_update_fraction(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the blob base fee update fraction for BPO1."""
    del block_number, timestamp
    return 8346193

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

Blobs in BPO1 have a target of 10 blobs per block.

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

@classmethod
def target_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Blobs in BPO1 have a target of 10 blobs per block."""
    del block_number, timestamp
    return 10

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

Blobs in BPO1 have a max of 15 blobs per block.

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

@classmethod
def max_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Blobs in BPO1 have a max of 15 blobs per block."""
    del block_number, timestamp
    return 15

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):
    """Mainnet BPO2 fork - Blob Parameter Only fork 2."""

    @classmethod
    def blob_base_fee_update_fraction(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the blob base fee update fraction for BPO2."""
        del block_number, timestamp
        return 11684671

    @classmethod
    def target_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Blobs in BPO2 have a target of 14 blobs per block."""
        del block_number, timestamp
        return 14

    @classmethod
    def max_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Blobs in BPO2 have a max of 21 blobs per block."""
        del block_number, timestamp
        return 21

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

Return the blob base fee update fraction for BPO2.

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

@classmethod
def blob_base_fee_update_fraction(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the blob base fee update fraction for BPO2."""
    del block_number, timestamp
    return 11684671

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

Blobs in BPO2 have a target of 14 blobs per block.

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

@classmethod
def target_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Blobs in BPO2 have a target of 14 blobs per block."""
    del block_number, timestamp
    return 14

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

Blobs in BPO2 have a max of 21 blobs per block.

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

@classmethod
def max_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Blobs in BPO2 have a max of 21 blobs per block."""
    del block_number, timestamp
    return 21

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

    @classmethod
    def is_deployed(cls) -> bool:
        """BPO3 is a pseudo fork for testing, not deployed to mainnet."""
        return False

    @classmethod
    def blob_base_fee_update_fraction(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the blob base fee update fraction for BPO3."""
        del block_number, timestamp
        return 20609697

    @classmethod
    def target_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Blobs in BPO3 have a target of 21 blobs per block."""
        del block_number, timestamp
        return 21

    @classmethod
    def max_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Blobs in BPO3 have a max of 32 blobs per block."""
        del block_number, timestamp
        return 32

is_deployed() classmethod

BPO3 is a pseudo fork for testing, not deployed to mainnet.

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

@classmethod
def is_deployed(cls) -> bool:
    """BPO3 is a pseudo fork for testing, not deployed to mainnet."""
    return False

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

Return the blob base fee update fraction for BPO3.

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

@classmethod
def blob_base_fee_update_fraction(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the blob base fee update fraction for BPO3."""
    del block_number, timestamp
    return 20609697

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

Blobs in BPO3 have a target of 21 blobs per block.

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

@classmethod
def target_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Blobs in BPO3 have a target of 21 blobs per block."""
    del block_number, timestamp
    return 21

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

Blobs in BPO3 have a max of 32 blobs per block.

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

@classmethod
def max_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Blobs in BPO3 have a max of 32 blobs per block."""
    del block_number, timestamp
    return 32

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

    @classmethod
    def blob_base_fee_update_fraction(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the blob base fee update fraction for BPO4."""
        del block_number, timestamp
        return 13739630

    @classmethod
    def target_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Blobs in BPO4 have a target of 14 blobs per block."""
        del block_number, timestamp
        return 14

    @classmethod
    def max_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Blobs in BPO4 have a max of 21 blobs per block."""
        del block_number, timestamp
        return 21

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

Return the blob base fee update fraction for BPO4.

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

@classmethod
def blob_base_fee_update_fraction(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the blob base fee update fraction for BPO4."""
    del block_number, timestamp
    return 13739630

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

Blobs in BPO4 have a target of 14 blobs per block.

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

@classmethod
def target_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Blobs in BPO4 have a target of 14 blobs per block."""
    del block_number, timestamp
    return 14

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

Blobs in BPO4 have a max of 21 blobs per block.

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

@classmethod
def max_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Blobs in BPO4 have a max of 21 blobs per block."""
    del block_number, timestamp
    return 21

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: BPO2

Amsterdam fork.

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

class Amsterdam(BPO2):
    """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.

    @classmethod
    def header_bal_hash_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """
        From Amsterdam, header must contain block access list hash (EIP-7928).
        """
        del block_number, timestamp
        return True

    @classmethod
    def is_deployed(cls) -> bool:
        """Return True if this fork is deployed."""
        return False

    @classmethod
    def engine_new_payload_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Optional[int]:
        """From Amsterdam, new payload calls must use version 5."""
        del block_number, timestamp
        return 5

    @classmethod
    def engine_execution_payload_block_access_list(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """
        From Amsterdam, engine execution payload includes `block_access_list`
        as a parameter.
        """
        del block_number, timestamp
        return True

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

From Amsterdam, header must contain block access list hash (EIP-7928).

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

@classmethod
def header_bal_hash_required(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """
    From Amsterdam, header must contain block access list hash (EIP-7928).
    """
    del block_number, timestamp
    return True

is_deployed() classmethod

Return True if this fork is deployed.

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

@classmethod
def is_deployed(cls) -> bool:
    """Return True if this fork is deployed."""
    return False

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

From Amsterdam, new payload calls must use version 5.

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

@classmethod
def engine_new_payload_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Optional[int]:
    """From Amsterdam, new payload calls must use version 5."""
    del block_number, timestamp
    return 5

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

From Amsterdam, engine execution payload includes block_access_list as a parameter.

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

@classmethod
def engine_execution_payload_block_access_list(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """
    From Amsterdam, engine execution payload includes `block_access_list`
    as a parameter.
    """
    del block_number, timestamp
    return True

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: Istanbul

Berlin fork.

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

class Berlin(Istanbul):
    """Berlin fork."""

    @classmethod
    def tx_types(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[int]:
        """At Berlin, access list transactions are introduced."""
        return [1] + super(Berlin, cls).tx_types(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def contract_creating_tx_types(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[int]:
        """At Berlin, access list transactions are introduced."""
        return [1] + super(Berlin, cls).contract_creating_tx_types(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def transaction_intrinsic_cost_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> TransactionIntrinsicCostCalculator:
        """
        At Berlin, the transaction intrinsic cost needs to take the access list
        into account.
        """
        super_fn = super(Berlin, cls).transaction_intrinsic_cost_calculator(
            block_number=block_number, timestamp=timestamp
        )
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )

        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

            intrinsic_cost: int = super_fn(
                calldata=calldata,
                contract_creation=contract_creation,
                authorization_list_or_count=authorization_list_or_count,
            )
            if access_list is not None:
                for access in access_list:
                    intrinsic_cost += gas_costs.G_ACCESS_LIST_ADDRESS
                    for _ in access.storage_keys:
                        intrinsic_cost += gas_costs.G_ACCESS_LIST_STORAGE
            return intrinsic_cost

        return fn

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

At Berlin, access list transactions are introduced.

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

@classmethod
def tx_types(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[int]:
    """At Berlin, access list transactions are introduced."""
    return [1] + super(Berlin, cls).tx_types(
        block_number=block_number, timestamp=timestamp
    )

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

At Berlin, access list transactions are introduced.

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

@classmethod
def contract_creating_tx_types(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[int]:
    """At Berlin, access list transactions are introduced."""
    return [1] + super(Berlin, cls).contract_creating_tx_types(
        block_number=block_number, timestamp=timestamp
    )

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

At Berlin, the transaction intrinsic cost needs to take the access list into account.

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

@classmethod
def transaction_intrinsic_cost_calculator(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> TransactionIntrinsicCostCalculator:
    """
    At Berlin, the transaction intrinsic cost needs to take the access list
    into account.
    """
    super_fn = super(Berlin, cls).transaction_intrinsic_cost_calculator(
        block_number=block_number, timestamp=timestamp
    )
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )

    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

        intrinsic_cost: int = super_fn(
            calldata=calldata,
            contract_creation=contract_creation,
            authorization_list_or_count=authorization_list_or_count,
        )
        if access_list is not None:
            for access in access_list:
                intrinsic_cost += gas_costs.G_ACCESS_LIST_ADDRESS
                for _ in access.storage_keys:
                    intrinsic_cost += gas_costs.G_ACCESS_LIST_STORAGE
        return intrinsic_cost

    return fn

Byzantium

Bases: SpuriousDragon

Byzantium fork.

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

class Byzantium(SpuriousDragon):
    """Byzantium fork."""

    @classmethod
    def get_reward(cls, *, block_number: int = 0, timestamp: int = 0) -> int:
        """
        At Byzantium, the block reward is reduced to 3_000_000_000_000_000_000
        wei.
        """
        del block_number, timestamp
        return 3_000_000_000_000_000_000

    @classmethod
    def precompiles(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Address]:
        """
        At Byzantium, precompiles for bigint modular exponentiation, addition
        and scalar multiplication on elliptic curve alt_bn128, and optimal ate
        pairing check on elliptic curve alt_bn128 are introduced.
        """
        return [
            Address(5, label="MODEXP"),
            Address(6, label="BN254_ADD"),
            Address(7, label="BN254_MUL"),
            Address(8, label="BN254_PAIRING"),
        ] + super(Byzantium, cls).precompiles(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def max_code_size(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        # NOTE: Move this to Spurious Dragon once this fork is introduced. See
        # EIP-170.
        """
        At Spurious Dragon, an upper bound was introduced for max contract code
        size.
        """
        del block_number, timestamp
        return 0x6000

    @classmethod
    def call_opcodes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """At Byzantium, STATICCALL opcode was introduced."""
        return [Opcodes.STATICCALL] + super(Byzantium, cls).call_opcodes(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def opcode_gas_map(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
        """Add Byzantium opcodes gas costs."""
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )
        memory_expansion_calculator = cls.memory_expansion_gas_calculator(
            block_number=block_number, timestamp=timestamp
        )
        base_map = super(Byzantium, cls).opcode_gas_map(
            block_number=block_number, timestamp=timestamp
        )
        return {
            **base_map,
            Opcodes.RETURNDATASIZE: gas_costs.G_BASE,
            Opcodes.RETURNDATACOPY: cls._with_memory_expansion(
                cls._with_data_copy(gas_costs.G_VERY_LOW, gas_costs),
                memory_expansion_calculator,
            ),
            Opcodes.STATICCALL: cls._with_memory_expansion(
                lambda op: cls._calculate_call_gas(op, gas_costs),
                memory_expansion_calculator,
            ),
            Opcodes.REVERT: cls._with_memory_expansion(
                0, memory_expansion_calculator
            ),
        }

    @classmethod
    def valid_opcodes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """Return list of Opcodes that are valid to work on this fork."""
        del block_number, timestamp
        return [
            Opcodes.REVERT,
            Opcodes.RETURNDATASIZE,
            Opcodes.RETURNDATACOPY,
            Opcodes.STATICCALL,
        ] + super(Byzantium, cls).valid_opcodes()

    @classmethod
    def gas_costs(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> GasCosts:
        """
        On Byzantium, precompiled contract gas costs are introduced.
        """
        return replace(
            super(Byzantium, cls).gas_costs(
                block_number=block_number, timestamp=timestamp
            ),
            G_PRECOMPILE_ECADD=500,
            G_PRECOMPILE_ECMUL=40_000,
            G_PRECOMPILE_ECPAIRING_BASE=100_000,
            G_PRECOMPILE_ECPAIRING_PER_POINT=80_000,
        )

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

At Byzantium, the block reward is reduced to 3_000_000_000_000_000_000 wei.

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

@classmethod
def get_reward(cls, *, block_number: int = 0, timestamp: int = 0) -> int:
    """
    At Byzantium, the block reward is reduced to 3_000_000_000_000_000_000
    wei.
    """
    del block_number, timestamp
    return 3_000_000_000_000_000_000

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

At Byzantium, precompiles for bigint modular exponentiation, addition and scalar multiplication on elliptic curve alt_bn128, and optimal ate pairing check on elliptic curve alt_bn128 are introduced.

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

@classmethod
def precompiles(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[Address]:
    """
    At Byzantium, precompiles for bigint modular exponentiation, addition
    and scalar multiplication on elliptic curve alt_bn128, and optimal ate
    pairing check on elliptic curve alt_bn128 are introduced.
    """
    return [
        Address(5, label="MODEXP"),
        Address(6, label="BN254_ADD"),
        Address(7, label="BN254_MUL"),
        Address(8, label="BN254_PAIRING"),
    ] + super(Byzantium, cls).precompiles(
        block_number=block_number, timestamp=timestamp
    )

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

At Spurious Dragon, an upper bound was introduced for max contract code size.

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

@classmethod
def max_code_size(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    # NOTE: Move this to Spurious Dragon once this fork is introduced. See
    # EIP-170.
    """
    At Spurious Dragon, an upper bound was introduced for max contract code
    size.
    """
    del block_number, timestamp
    return 0x6000

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

At Byzantium, STATICCALL opcode was introduced.

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

@classmethod
def call_opcodes(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """At Byzantium, STATICCALL opcode was introduced."""
    return [Opcodes.STATICCALL] + super(Byzantium, cls).call_opcodes(
        block_number=block_number, timestamp=timestamp
    )

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

Add Byzantium opcodes gas costs.

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

@classmethod
def opcode_gas_map(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
    """Add Byzantium opcodes gas costs."""
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )
    memory_expansion_calculator = cls.memory_expansion_gas_calculator(
        block_number=block_number, timestamp=timestamp
    )
    base_map = super(Byzantium, cls).opcode_gas_map(
        block_number=block_number, timestamp=timestamp
    )
    return {
        **base_map,
        Opcodes.RETURNDATASIZE: gas_costs.G_BASE,
        Opcodes.RETURNDATACOPY: cls._with_memory_expansion(
            cls._with_data_copy(gas_costs.G_VERY_LOW, gas_costs),
            memory_expansion_calculator,
        ),
        Opcodes.STATICCALL: cls._with_memory_expansion(
            lambda op: cls._calculate_call_gas(op, gas_costs),
            memory_expansion_calculator,
        ),
        Opcodes.REVERT: cls._with_memory_expansion(
            0, memory_expansion_calculator
        ),
    }

valid_opcodes(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """Return list of Opcodes that are valid to work on this fork."""
    del block_number, timestamp
    return [
        Opcodes.REVERT,
        Opcodes.RETURNDATASIZE,
        Opcodes.RETURNDATACOPY,
        Opcodes.STATICCALL,
    ] + super(Byzantium, cls).valid_opcodes()

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

On Byzantium, precompiled contract gas costs are introduced.

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

@classmethod
def gas_costs(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> GasCosts:
    """
    On Byzantium, precompiled contract gas costs are introduced.
    """
    return replace(
        super(Byzantium, cls).gas_costs(
            block_number=block_number, timestamp=timestamp
        ),
        G_PRECOMPILE_ECADD=500,
        G_PRECOMPILE_ECMUL=40_000,
        G_PRECOMPILE_ECPAIRING_BASE=100_000,
        G_PRECOMPILE_ECPAIRING_PER_POINT=80_000,
    )

Cancun

Bases: Shanghai

Cancun fork.

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

class Cancun(Shanghai):
    """Cancun fork."""

    BLOB_CONSTANTS = {  # every value is an int or a Literal
        "FIELD_ELEMENTS_PER_BLOB": 4096,
        "BYTES_PER_FIELD_ELEMENT": 32,
        "CELL_LENGTH": 2048,
        # EIP-2537: Main subgroup order = q, due to this BLS_MODULUS
        # every blob byte (uint256) must be smaller than 116
        "BLS_MODULUS": (
            0x73EDA753299D7D483339D80809A1D80553BDA402FFFE5BFEFFFFFFFF00000001
        ),
        # https://github.com/ethereum/consensus-specs/blob/
        # cc6996c22692d70e41b7a453d925172ee4b719ad/specs/deneb/
        # polynomial-commitments.md?plain=1#L78
        "BYTES_PER_PROOF": 48,
        "BYTES_PER_COMMITMENT": 48,
        "KZG_ENDIANNESS": "big",
        "AMOUNT_CELL_PROOFS": 0,
    }

    @classmethod
    def get_blob_constant(cls, name: str) -> int | Literal["big"]:
        """Return blob constant if it exists."""
        retrieved_constant = cls.BLOB_CONSTANTS.get(name)
        assert retrieved_constant is not None, (
            f"You tried to retrieve the blob constant {name} but it does "
            "not exist!"
        )
        return retrieved_constant

    @classmethod
    def header_excess_blob_gas_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """Excess blob gas is required starting from Cancun."""
        del block_number, timestamp
        return True

    @classmethod
    def header_blob_gas_used_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """Blob gas used is required starting from Cancun."""
        del block_number, timestamp
        return True

    @classmethod
    def header_beacon_root_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """Parent beacon block root is required starting from Cancun."""
        del block_number, timestamp
        return True

    @classmethod
    def blob_gas_price_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> BlobGasPriceCalculator:
        """Return a callable that calculates the blob gas price at Cancun."""
        min_base_fee_per_blob_gas = cls.min_base_fee_per_blob_gas(
            block_number=block_number, timestamp=timestamp
        )
        blob_base_fee_update_fraction = cls.blob_base_fee_update_fraction(
            block_number=block_number, timestamp=timestamp
        )

        def fn(*, excess_blob_gas: int) -> int:
            return fake_exponential(
                min_base_fee_per_blob_gas,
                excess_blob_gas,
                blob_base_fee_update_fraction,
            )

        return fn

    @classmethod
    def excess_blob_gas_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> ExcessBlobGasCalculator:
        """
        Return a callable that calculates the excess blob gas for a block at
        Cancun.
        """
        target_blobs_per_block = cls.target_blobs_per_block(
            block_number=block_number, timestamp=timestamp
        )
        blob_gas_per_blob = cls.blob_gas_per_blob(
            block_number=block_number, timestamp=timestamp
        )
        target_blob_gas_per_block = target_blobs_per_block * blob_gas_per_blob

        def fn(
            *,
            parent_excess_blob_gas: int | None = None,
            parent_excess_blobs: int | None = None,
            parent_blob_gas_used: int | None = None,
            parent_blob_count: int | None = None,
            # Required for Osaka as using this as base
            parent_base_fee_per_gas: int,
        ) -> int:
            del parent_base_fee_per_gas

            if parent_excess_blob_gas is None:
                assert parent_excess_blobs is not None, (
                    "Parent excess blobs are required"
                )
                parent_excess_blob_gas = (
                    parent_excess_blobs * blob_gas_per_blob
                )
            if parent_blob_gas_used is None:
                assert parent_blob_count is not None, (
                    "Parent blob count is required"
                )
                parent_blob_gas_used = parent_blob_count * blob_gas_per_blob
            if (
                parent_excess_blob_gas + parent_blob_gas_used
                < target_blob_gas_per_block
            ):
                return 0
            else:
                return (
                    parent_excess_blob_gas
                    + parent_blob_gas_used
                    - target_blob_gas_per_block
                )

        return fn

    @classmethod
    def min_base_fee_per_blob_gas(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the minimum base fee per blob gas for Cancun."""
        del block_number, timestamp
        return 1

    @classmethod
    def blob_base_fee_update_fraction(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the blob base fee update fraction for Cancun."""
        del block_number, timestamp
        return 3338477

    @classmethod
    def blob_gas_per_blob(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Blobs are enabled starting from Cancun."""
        del block_number, timestamp
        return 2**17

    @classmethod
    def supports_blobs(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At Cancun, blobs support is enabled."""
        del block_number, timestamp
        return True

    @classmethod
    def target_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """
        Blobs are enabled starting from Cancun, with a static target of 3 blobs
        per block.
        """
        del block_number, timestamp
        return 3

    @classmethod
    def max_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """
        Blobs are enabled starting from Cancun, with a static max of 6 blobs
        per block.
        """
        del block_number, timestamp
        return 6

    @classmethod
    def blob_reserve_price_active(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """Blob reserve price is not supported in Cancun."""
        del block_number, timestamp
        return False

    @classmethod
    def full_blob_tx_wrapper_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int | None:
        """
        Pre-Osaka forks don't use tx wrapper versions for full blob
        transactions.
        """
        del block_number, timestamp
        return None

    @classmethod
    def max_blobs_per_tx(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """
        Blobs are enabled starting from Cancun, with a static max equal to the
        max per block.
        """
        return cls.max_blobs_per_block(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def blob_schedule(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> BlobSchedule | None:
        """
        At Cancun, the fork object runs this routine to get the updated blob
        schedule.
        """
        parent_fork = cls.parent()
        assert parent_fork is not None, "Parent fork must be defined"
        blob_schedule = (
            parent_fork.blob_schedule(
                block_number=block_number, timestamp=timestamp
            )
            or BlobSchedule()
        )
        current_blob_schedule = ForkBlobSchedule(
            target_blobs_per_block=cls.target_blobs_per_block(
                block_number=block_number, timestamp=timestamp
            ),
            max_blobs_per_block=cls.max_blobs_per_block(
                block_number=block_number, timestamp=timestamp
            ),
            base_fee_update_fraction=cls.blob_base_fee_update_fraction(
                block_number=block_number, timestamp=timestamp
            ),
        )
        blob_schedule.append(fork=cls.name(), schedule=current_blob_schedule)
        return blob_schedule

    @classmethod
    def tx_types(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[int]:
        """At Cancun, blob type transactions are introduced."""
        return [3] + super(Cancun, cls).tx_types(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def precompiles(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Address]:
        """At Cancun, a precompile for kzg point evaluation is introduced."""
        return [
            Address(10, label="KZG_POINT_EVALUATION"),
        ] + super(Cancun, cls).precompiles(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def system_contracts(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Address]:
        """Cancun introduces the system contract for EIP-4788."""
        del block_number, timestamp
        return [
            Address(
                0x000F3DF6D732807EF1319FB7B8BB8522D0BEAC02,
                label="BEACON_ROOTS_ADDRESS",
            )
        ]

    @classmethod
    def pre_allocation_blockchain(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Mapping:
        """
        Cancun requires pre-allocation of the beacon root contract for EIP-4788
        on blockchain type tests.
        """
        del block_number, timestamp
        new_allocation = {
            0x000F3DF6D732807EF1319FB7B8BB8522D0BEAC02: {
                "nonce": 1,
                "code": "0x3373fffffffffffffffffffffffffffffffffffffffe14604d"
                "57602036146024575f5ffd5b5f35801560495762001fff810690"
                "815414603c575f5ffd5b62001fff01545f5260205ff35b5f5ffd"
                "5b62001fff42064281555f359062001fff015500",
            }
        }
        return new_allocation | super(Cancun, cls).pre_allocation_blockchain()  # type: ignore

    @classmethod
    def engine_new_payload_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Optional[int]:
        """From Cancun, new payload calls must use version 3."""
        del block_number, timestamp
        return 3

    @classmethod
    def engine_get_blobs_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Optional[int]:
        """At Cancun, the engine get blobs version is 1."""
        del block_number, timestamp
        return 1

    @classmethod
    def engine_new_payload_blob_hashes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """From Cancun, payloads must have blob hashes."""
        del block_number, timestamp
        return True

    @classmethod
    def engine_new_payload_beacon_root(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """From Cancun, payloads must have a parent beacon block root."""
        del block_number, timestamp
        return True

    @classmethod
    def gas_costs(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> GasCosts:
        """On Cancun, the point evaluation precompile gas cost is set."""
        return replace(
            super(Cancun, cls).gas_costs(
                block_number=block_number, timestamp=timestamp
            ),
            G_PRECOMPILE_POINT_EVALUATION=50_000,
        )

    @classmethod
    def opcode_gas_map(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
        """
        Return a mapping of opcodes to their gas costs for Cancun.

        Adds Cancun-specific opcodes: BLOBHASH, BLOBBASEFEE, TLOAD, TSTORE,
        MCOPY.
        """
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )
        memory_expansion_calculator = cls.memory_expansion_gas_calculator(
            block_number=block_number, timestamp=timestamp
        )

        # Get parent fork's opcode gas map
        base_map = super(Cancun, cls).opcode_gas_map(
            block_number=block_number, timestamp=timestamp
        )

        # Add Cancun-specific opcodes
        return {
            **base_map,
            # EIP-4844: Shard Blob Transactions
            Opcodes.BLOBHASH: gas_costs.G_VERY_LOW,
            # EIP-7516: BLOBBASEFEE opcode
            Opcodes.BLOBBASEFEE: gas_costs.G_BASE,
            # EIP-1153: Transient storage opcodes
            Opcodes.TLOAD: gas_costs.G_WARM_SLOAD,
            Opcodes.TSTORE: gas_costs.G_WARM_SLOAD,
            # EIP-5656: MCOPY - Memory copying instruction
            Opcodes.MCOPY: cls._with_memory_expansion(
                cls._with_data_copy(gas_costs.G_VERY_LOW, gas_costs),
                memory_expansion_calculator,
            ),
        }

    @classmethod
    def valid_opcodes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """Return list of Opcodes that are valid to work on this fork."""
        del block_number, timestamp
        return [
            Opcodes.BLOBHASH,
            Opcodes.BLOBBASEFEE,
            Opcodes.TLOAD,
            Opcodes.TSTORE,
            Opcodes.MCOPY,
        ] + super(Cancun, cls).valid_opcodes()

get_blob_constant(name) classmethod

Return blob constant if it exists.

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

@classmethod
def get_blob_constant(cls, name: str) -> int | Literal["big"]:
    """Return blob constant if it exists."""
    retrieved_constant = cls.BLOB_CONSTANTS.get(name)
    assert retrieved_constant is not None, (
        f"You tried to retrieve the blob constant {name} but it does "
        "not exist!"
    )
    return retrieved_constant

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

Excess blob gas is required starting from Cancun.

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

@classmethod
def header_excess_blob_gas_required(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """Excess blob gas is required starting from Cancun."""
    del block_number, timestamp
    return True

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

Blob gas used is required starting from Cancun.

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

@classmethod
def header_blob_gas_used_required(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """Blob gas used is required starting from Cancun."""
    del block_number, timestamp
    return True

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

Parent beacon block root is required starting from Cancun.

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

@classmethod
def header_beacon_root_required(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """Parent beacon block root is required starting from Cancun."""
    del block_number, timestamp
    return True

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

Return a callable that calculates the blob gas price at Cancun.

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

@classmethod
def blob_gas_price_calculator(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> BlobGasPriceCalculator:
    """Return a callable that calculates the blob gas price at Cancun."""
    min_base_fee_per_blob_gas = cls.min_base_fee_per_blob_gas(
        block_number=block_number, timestamp=timestamp
    )
    blob_base_fee_update_fraction = cls.blob_base_fee_update_fraction(
        block_number=block_number, timestamp=timestamp
    )

    def fn(*, excess_blob_gas: int) -> int:
        return fake_exponential(
            min_base_fee_per_blob_gas,
            excess_blob_gas,
            blob_base_fee_update_fraction,
        )

    return fn

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

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

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

@classmethod
def excess_blob_gas_calculator(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> ExcessBlobGasCalculator:
    """
    Return a callable that calculates the excess blob gas for a block at
    Cancun.
    """
    target_blobs_per_block = cls.target_blobs_per_block(
        block_number=block_number, timestamp=timestamp
    )
    blob_gas_per_blob = cls.blob_gas_per_blob(
        block_number=block_number, timestamp=timestamp
    )
    target_blob_gas_per_block = target_blobs_per_block * blob_gas_per_blob

    def fn(
        *,
        parent_excess_blob_gas: int | None = None,
        parent_excess_blobs: int | None = None,
        parent_blob_gas_used: int | None = None,
        parent_blob_count: int | None = None,
        # Required for Osaka as using this as base
        parent_base_fee_per_gas: int,
    ) -> int:
        del parent_base_fee_per_gas

        if parent_excess_blob_gas is None:
            assert parent_excess_blobs is not None, (
                "Parent excess blobs are required"
            )
            parent_excess_blob_gas = (
                parent_excess_blobs * blob_gas_per_blob
            )
        if parent_blob_gas_used is None:
            assert parent_blob_count is not None, (
                "Parent blob count is required"
            )
            parent_blob_gas_used = parent_blob_count * blob_gas_per_blob
        if (
            parent_excess_blob_gas + parent_blob_gas_used
            < target_blob_gas_per_block
        ):
            return 0
        else:
            return (
                parent_excess_blob_gas
                + parent_blob_gas_used
                - target_blob_gas_per_block
            )

    return fn

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

Return the minimum base fee per blob gas for Cancun.

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

@classmethod
def min_base_fee_per_blob_gas(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the minimum base fee per blob gas for Cancun."""
    del block_number, timestamp
    return 1

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

Return the blob base fee update fraction for Cancun.

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

@classmethod
def blob_base_fee_update_fraction(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the blob base fee update fraction for Cancun."""
    del block_number, timestamp
    return 3338477

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

Blobs are enabled starting from Cancun.

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

@classmethod
def blob_gas_per_blob(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Blobs are enabled starting from Cancun."""
    del block_number, timestamp
    return 2**17

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

At Cancun, blobs support is enabled.

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

@classmethod
def supports_blobs(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At Cancun, blobs support is enabled."""
    del block_number, timestamp
    return True

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

Blobs are enabled starting from Cancun, with a static target of 3 blobs per block.

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

@classmethod
def target_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """
    Blobs are enabled starting from Cancun, with a static target of 3 blobs
    per block.
    """
    del block_number, timestamp
    return 3

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

Blobs are enabled starting from Cancun, with a static max of 6 blobs per block.

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

@classmethod
def max_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """
    Blobs are enabled starting from Cancun, with a static max of 6 blobs
    per block.
    """
    del block_number, timestamp
    return 6

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

Blob reserve price is not supported in Cancun.

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

@classmethod
def blob_reserve_price_active(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """Blob reserve price is not supported in Cancun."""
    del block_number, timestamp
    return False

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

Pre-Osaka forks don't use tx wrapper versions for full blob transactions.

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

@classmethod
def full_blob_tx_wrapper_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int | None:
    """
    Pre-Osaka forks don't use tx wrapper versions for full blob
    transactions.
    """
    del block_number, timestamp
    return None

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

Blobs are enabled starting from Cancun, with a static max equal to the max per block.

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

@classmethod
def max_blobs_per_tx(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """
    Blobs are enabled starting from Cancun, with a static max equal to the
    max per block.
    """
    return cls.max_blobs_per_block(
        block_number=block_number, timestamp=timestamp
    )

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

At Cancun, the fork object runs this routine to get the updated blob schedule.

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

@classmethod
def blob_schedule(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> BlobSchedule | None:
    """
    At Cancun, the fork object runs this routine to get the updated blob
    schedule.
    """
    parent_fork = cls.parent()
    assert parent_fork is not None, "Parent fork must be defined"
    blob_schedule = (
        parent_fork.blob_schedule(
            block_number=block_number, timestamp=timestamp
        )
        or BlobSchedule()
    )
    current_blob_schedule = ForkBlobSchedule(
        target_blobs_per_block=cls.target_blobs_per_block(
            block_number=block_number, timestamp=timestamp
        ),
        max_blobs_per_block=cls.max_blobs_per_block(
            block_number=block_number, timestamp=timestamp
        ),
        base_fee_update_fraction=cls.blob_base_fee_update_fraction(
            block_number=block_number, timestamp=timestamp
        ),
    )
    blob_schedule.append(fork=cls.name(), schedule=current_blob_schedule)
    return blob_schedule

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

At Cancun, blob type transactions are introduced.

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

@classmethod
def tx_types(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[int]:
    """At Cancun, blob type transactions are introduced."""
    return [3] + super(Cancun, cls).tx_types(
        block_number=block_number, timestamp=timestamp
    )

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

At Cancun, a precompile for kzg point evaluation is introduced.

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

@classmethod
def precompiles(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[Address]:
    """At Cancun, a precompile for kzg point evaluation is introduced."""
    return [
        Address(10, label="KZG_POINT_EVALUATION"),
    ] + super(Cancun, cls).precompiles(
        block_number=block_number, timestamp=timestamp
    )

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

Cancun introduces the system contract for EIP-4788.

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

@classmethod
def system_contracts(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[Address]:
    """Cancun introduces the system contract for EIP-4788."""
    del block_number, timestamp
    return [
        Address(
            0x000F3DF6D732807EF1319FB7B8BB8522D0BEAC02,
            label="BEACON_ROOTS_ADDRESS",
        )
    ]

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

Cancun requires pre-allocation of the beacon root contract for EIP-4788 on blockchain type tests.

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

@classmethod
def pre_allocation_blockchain(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Mapping:
    """
    Cancun requires pre-allocation of the beacon root contract for EIP-4788
    on blockchain type tests.
    """
    del block_number, timestamp
    new_allocation = {
        0x000F3DF6D732807EF1319FB7B8BB8522D0BEAC02: {
            "nonce": 1,
            "code": "0x3373fffffffffffffffffffffffffffffffffffffffe14604d"
            "57602036146024575f5ffd5b5f35801560495762001fff810690"
            "815414603c575f5ffd5b62001fff01545f5260205ff35b5f5ffd"
            "5b62001fff42064281555f359062001fff015500",
        }
    }
    return new_allocation | super(Cancun, cls).pre_allocation_blockchain()  # type: ignore

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

From Cancun, new payload calls must use version 3.

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

@classmethod
def engine_new_payload_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Optional[int]:
    """From Cancun, new payload calls must use version 3."""
    del block_number, timestamp
    return 3

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

At Cancun, the engine get blobs version is 1.

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

@classmethod
def engine_get_blobs_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Optional[int]:
    """At Cancun, the engine get blobs version is 1."""
    del block_number, timestamp
    return 1

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

From Cancun, payloads must have blob hashes.

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

@classmethod
def engine_new_payload_blob_hashes(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """From Cancun, payloads must have blob hashes."""
    del block_number, timestamp
    return True

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

From Cancun, payloads must 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """From Cancun, payloads must have a parent beacon block root."""
    del block_number, timestamp
    return True

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

On Cancun, the point evaluation precompile gas cost is set.

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

@classmethod
def gas_costs(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> GasCosts:
    """On Cancun, the point evaluation precompile gas cost is set."""
    return replace(
        super(Cancun, cls).gas_costs(
            block_number=block_number, timestamp=timestamp
        ),
        G_PRECOMPILE_POINT_EVALUATION=50_000,
    )

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

Return a mapping of opcodes to their gas costs for Cancun.

Adds Cancun-specific opcodes: BLOBHASH, BLOBBASEFEE, TLOAD, TSTORE, MCOPY.

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

@classmethod
def opcode_gas_map(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
    """
    Return a mapping of opcodes to their gas costs for Cancun.

    Adds Cancun-specific opcodes: BLOBHASH, BLOBBASEFEE, TLOAD, TSTORE,
    MCOPY.
    """
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )
    memory_expansion_calculator = cls.memory_expansion_gas_calculator(
        block_number=block_number, timestamp=timestamp
    )

    # Get parent fork's opcode gas map
    base_map = super(Cancun, cls).opcode_gas_map(
        block_number=block_number, timestamp=timestamp
    )

    # Add Cancun-specific opcodes
    return {
        **base_map,
        # EIP-4844: Shard Blob Transactions
        Opcodes.BLOBHASH: gas_costs.G_VERY_LOW,
        # EIP-7516: BLOBBASEFEE opcode
        Opcodes.BLOBBASEFEE: gas_costs.G_BASE,
        # EIP-1153: Transient storage opcodes
        Opcodes.TLOAD: gas_costs.G_WARM_SLOAD,
        Opcodes.TSTORE: gas_costs.G_WARM_SLOAD,
        # EIP-5656: MCOPY - Memory copying instruction
        Opcodes.MCOPY: cls._with_memory_expansion(
            cls._with_data_copy(gas_costs.G_VERY_LOW, gas_costs),
            memory_expansion_calculator,
        ),
    }

valid_opcodes(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """Return list of Opcodes that are valid to work on this fork."""
    del block_number, timestamp
    return [
        Opcodes.BLOBHASH,
        Opcodes.BLOBBASEFEE,
        Opcodes.TLOAD,
        Opcodes.TSTORE,
        Opcodes.MCOPY,
    ] + super(Cancun, cls).valid_opcodes()

Constantinople

Bases: Byzantium

Constantinople fork.

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

class Constantinople(Byzantium):
    """Constantinople fork."""

    @classmethod
    def get_reward(cls, *, block_number: int = 0, timestamp: int = 0) -> int:
        """
        At Constantinople, the block reward is reduced to
        2_000_000_000_000_000_000 wei.
        """
        del block_number, timestamp
        return 2_000_000_000_000_000_000

    @classmethod
    def _calculate_create2_gas(
        cls, opcode: OpcodeBase, gas_costs: GasCosts
    ) -> int:
        """Calculate CREATE2 gas cost based on metadata."""
        metadata = opcode.metadata

        # Keccak256 hashing cost
        init_code_size = metadata["init_code_size"]
        init_code_words = (init_code_size + 31) // 32
        hash_gas = gas_costs.G_KECCAK_256_WORD * init_code_words

        return gas_costs.G_CREATE + hash_gas

    @classmethod
    def create_opcodes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """At Constantinople, `CREATE2` opcode is added."""
        return [Opcodes.CREATE2] + super(Constantinople, cls).create_opcodes(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def opcode_gas_map(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
        """Add Constantinople opcodes gas costs."""
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )
        memory_expansion_calculator = cls.memory_expansion_gas_calculator(
            block_number=block_number, timestamp=timestamp
        )
        base_map = super(Constantinople, cls).opcode_gas_map(
            block_number=block_number, timestamp=timestamp
        )
        return {
            **base_map,
            Opcodes.SHL: gas_costs.G_VERY_LOW,
            Opcodes.SHR: gas_costs.G_VERY_LOW,
            Opcodes.SAR: gas_costs.G_VERY_LOW,
            Opcodes.EXTCODEHASH: cls._with_account_access(0, gas_costs),
            Opcodes.CREATE2: cls._with_memory_expansion(
                lambda op: cls._calculate_create2_gas(op, gas_costs),
                memory_expansion_calculator,
            ),
        }

    @classmethod
    def valid_opcodes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """Return list of Opcodes that are valid to work on this fork."""
        del block_number, timestamp
        return [
            Opcodes.SHL,
            Opcodes.SHR,
            Opcodes.SAR,
            Opcodes.EXTCODEHASH,
            Opcodes.CREATE2,
        ] + super(Constantinople, cls).valid_opcodes()

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

At Constantinople, the block reward is reduced to 2_000_000_000_000_000_000 wei.

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

@classmethod
def get_reward(cls, *, block_number: int = 0, timestamp: int = 0) -> int:
    """
    At Constantinople, the block reward is reduced to
    2_000_000_000_000_000_000 wei.
    """
    del block_number, timestamp
    return 2_000_000_000_000_000_000

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

At Constantinople, CREATE2 opcode is added.

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

@classmethod
def create_opcodes(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """At Constantinople, `CREATE2` opcode is added."""
    return [Opcodes.CREATE2] + super(Constantinople, cls).create_opcodes(
        block_number=block_number, timestamp=timestamp
    )

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

Add Constantinople opcodes gas costs.

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

@classmethod
def opcode_gas_map(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
    """Add Constantinople opcodes gas costs."""
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )
    memory_expansion_calculator = cls.memory_expansion_gas_calculator(
        block_number=block_number, timestamp=timestamp
    )
    base_map = super(Constantinople, cls).opcode_gas_map(
        block_number=block_number, timestamp=timestamp
    )
    return {
        **base_map,
        Opcodes.SHL: gas_costs.G_VERY_LOW,
        Opcodes.SHR: gas_costs.G_VERY_LOW,
        Opcodes.SAR: gas_costs.G_VERY_LOW,
        Opcodes.EXTCODEHASH: cls._with_account_access(0, gas_costs),
        Opcodes.CREATE2: cls._with_memory_expansion(
            lambda op: cls._calculate_create2_gas(op, gas_costs),
            memory_expansion_calculator,
        ),
    }

valid_opcodes(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """Return list of Opcodes that are valid to work on this fork."""
    del block_number, timestamp
    return [
        Opcodes.SHL,
        Opcodes.SHR,
        Opcodes.SAR,
        Opcodes.EXTCODEHASH,
        Opcodes.CREATE2,
    ] + super(Constantinople, cls).valid_opcodes()

ConstantinopleFix

Bases: Constantinople

Constantinople Fix fork.

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

class ConstantinopleFix(Constantinople, solc_name="constantinople"):
    """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, *, block_number: int = 0, timestamp: int = 0
    ) -> str:
        """
        Return fork name as it's meant to be passed to the transition tool for
        execution.
        """
        del block_number, timestamp
        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, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At genesis, header must not contain base fee."""
        del block_number, timestamp
        return False

    @classmethod
    def header_prev_randao_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At genesis, header must not contain Prev Randao value."""
        del block_number, timestamp
        return False

    @classmethod
    def header_zero_difficulty_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At genesis, header must not have difficulty zero."""
        del block_number, timestamp
        return False

    @classmethod
    def header_withdrawals_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At genesis, header must not contain withdrawals."""
        del block_number, timestamp
        return False

    @classmethod
    def header_excess_blob_gas_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At genesis, header must not contain excess blob gas."""
        del block_number, timestamp
        return False

    @classmethod
    def header_blob_gas_used_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At genesis, header must not contain blob gas used."""
        del block_number, timestamp
        return False

    @classmethod
    def gas_costs(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> GasCosts:
        """
        Return dataclass with the defined gas costs constants for genesis.
        """
        del block_number, timestamp
        return GasCosts(
            G_JUMPDEST=1,
            G_BASE=2,
            G_VERY_LOW=3,
            G_LOW=5,
            G_MID=8,
            G_HIGH=10,
            G_WARM_ACCOUNT_ACCESS=100,
            G_COLD_ACCOUNT_ACCESS=2_600,
            G_ACCESS_LIST_ADDRESS=2_400,
            G_ACCESS_LIST_STORAGE=1_900,
            G_WARM_SLOAD=100,
            G_COLD_SLOAD=2_100,
            G_STORAGE_SET=20_000,
            G_STORAGE_UPDATE=5_000,
            G_STORAGE_RESET=2_900,
            R_STORAGE_CLEAR=4_800,
            G_SELF_DESTRUCT=5_000,
            G_CREATE=32_000,
            G_CODE_DEPOSIT_BYTE=200,
            G_INITCODE_WORD=2,
            G_CALL_VALUE=9_000,
            G_CALL_STIPEND=2_300,
            G_NEW_ACCOUNT=25_000,
            G_EXP=10,
            G_EXP_BYTE=50,
            G_MEMORY=3,
            G_TX_DATA_ZERO=4,
            G_TX_DATA_NON_ZERO=68,
            G_TRANSACTION=21_000,
            G_TRANSACTION_CREATE=32_000,
            G_LOG=375,
            G_LOG_DATA=8,
            G_LOG_TOPIC=375,
            G_KECCAK_256=30,
            G_KECCAK_256_WORD=6,
            G_COPY=3,
            G_BLOCKHASH=20,
            G_PRECOMPILE_ECRECOVER=3_000,
            G_PRECOMPILE_SHA256_BASE=60,
            G_PRECOMPILE_SHA256_WORD=12,
            G_PRECOMPILE_RIPEMD160_BASE=600,
            G_PRECOMPILE_RIPEMD160_WORD=120,
            G_PRECOMPILE_IDENTITY_BASE=15,
            G_PRECOMPILE_IDENTITY_WORD=3,
            # Zero-initialized: introduced in later forks, set via
            # replace() in the fork that activates them.
            G_TX_DATA_STANDARD_TOKEN_COST=0,
            G_TX_DATA_FLOOR_TOKEN_COST=0,
            G_AUTHORIZATION=0,
            R_AUTHORIZATION_EXISTING_AUTHORITY=0,
            G_PRECOMPILE_ECADD=0,
            G_PRECOMPILE_ECMUL=0,
            G_PRECOMPILE_ECPAIRING_BASE=0,
            G_PRECOMPILE_ECPAIRING_PER_POINT=0,
            G_PRECOMPILE_BLAKE2F_BASE=0,
            G_PRECOMPILE_BLAKE2F_PER_ROUND=0,
            G_PRECOMPILE_POINT_EVALUATION=0,
            G_PRECOMPILE_BLS_G1ADD=0,
            G_PRECOMPILE_BLS_G1MUL=0,
            G_PRECOMPILE_BLS_G1MAP=0,
            G_PRECOMPILE_BLS_G2ADD=0,
            G_PRECOMPILE_BLS_G2MUL=0,
            G_PRECOMPILE_BLS_G2MAP=0,
            G_PRECOMPILE_BLS_PAIRING_BASE=0,
            G_PRECOMPILE_BLS_PAIRING_PER_PAIR=0,
            G_PRECOMPILE_P256VERIFY=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.G_WARM_ACCOUNT_ACCESS
            else:
                access_cost = gas_costs.G_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 G_COPY

        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.G_COPY * word_count

            return base_cost + copy_cost

        return wrapper

    @classmethod
    def opcode_gas_map(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> 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(
            block_number=block_number, timestamp=timestamp
        )
        memory_expansion_calculator = cls.memory_expansion_gas_calculator(
            block_number=block_number, timestamp=timestamp
        )

        # 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.G_VERY_LOW,
            Opcodes.MUL: gas_costs.G_LOW,
            Opcodes.SUB: gas_costs.G_VERY_LOW,
            Opcodes.DIV: gas_costs.G_LOW,
            Opcodes.SDIV: gas_costs.G_LOW,
            Opcodes.MOD: gas_costs.G_LOW,
            Opcodes.SMOD: gas_costs.G_LOW,
            Opcodes.ADDMOD: gas_costs.G_MID,
            Opcodes.MULMOD: gas_costs.G_MID,
            Opcodes.EXP: lambda op: (
                gas_costs.G_EXP
                + gas_costs.G_EXP_BYTE
                * ((op.metadata["exponent"].bit_length() + 7) // 8)
            ),
            Opcodes.SIGNEXTEND: gas_costs.G_LOW,
            # Comparison & bitwise logic operations
            Opcodes.LT: gas_costs.G_VERY_LOW,
            Opcodes.GT: gas_costs.G_VERY_LOW,
            Opcodes.SLT: gas_costs.G_VERY_LOW,
            Opcodes.SGT: gas_costs.G_VERY_LOW,
            Opcodes.EQ: gas_costs.G_VERY_LOW,
            Opcodes.ISZERO: gas_costs.G_VERY_LOW,
            Opcodes.AND: gas_costs.G_VERY_LOW,
            Opcodes.OR: gas_costs.G_VERY_LOW,
            Opcodes.XOR: gas_costs.G_VERY_LOW,
            Opcodes.NOT: gas_costs.G_VERY_LOW,
            Opcodes.BYTE: gas_costs.G_VERY_LOW,
            # SHA3
            Opcodes.SHA3: cls._with_memory_expansion(
                lambda op: (
                    gas_costs.G_KECCAK_256
                    + gas_costs.G_KECCAK_256_WORD
                    * ((op.metadata["data_size"] + 31) // 32)
                ),
                memory_expansion_calculator,
            ),
            # Environmental information
            Opcodes.ADDRESS: gas_costs.G_BASE,
            Opcodes.BALANCE: cls._with_account_access(0, gas_costs),
            Opcodes.ORIGIN: gas_costs.G_BASE,
            Opcodes.CALLER: gas_costs.G_BASE,
            Opcodes.CALLVALUE: gas_costs.G_BASE,
            Opcodes.CALLDATALOAD: gas_costs.G_VERY_LOW,
            Opcodes.CALLDATASIZE: gas_costs.G_BASE,
            Opcodes.CALLDATACOPY: cls._with_memory_expansion(
                cls._with_data_copy(gas_costs.G_VERY_LOW, gas_costs),
                memory_expansion_calculator,
            ),
            Opcodes.CODESIZE: gas_costs.G_BASE,
            Opcodes.CODECOPY: cls._with_memory_expansion(
                cls._with_data_copy(gas_costs.G_VERY_LOW, gas_costs),
                memory_expansion_calculator,
            ),
            Opcodes.GASPRICE: gas_costs.G_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.G_BLOCKHASH,
            Opcodes.COINBASE: gas_costs.G_BASE,
            Opcodes.TIMESTAMP: gas_costs.G_BASE,
            Opcodes.NUMBER: gas_costs.G_BASE,
            Opcodes.PREVRANDAO: gas_costs.G_BASE,
            Opcodes.GASLIMIT: gas_costs.G_BASE,
            # Stack, memory, storage and flow operations
            Opcodes.POP: gas_costs.G_BASE,
            Opcodes.MLOAD: cls._with_memory_expansion(
                gas_costs.G_VERY_LOW, memory_expansion_calculator
            ),
            Opcodes.MSTORE: cls._with_memory_expansion(
                gas_costs.G_VERY_LOW, memory_expansion_calculator
            ),
            Opcodes.MSTORE8: cls._with_memory_expansion(
                gas_costs.G_VERY_LOW, memory_expansion_calculator
            ),
            Opcodes.SLOAD: lambda op: (
                gas_costs.G_WARM_SLOAD
                if op.metadata["key_warm"]
                else gas_costs.G_COLD_SLOAD
            ),
            Opcodes.SSTORE: lambda op: cls._calculate_sstore_gas(
                op, gas_costs
            ),
            Opcodes.JUMP: gas_costs.G_MID,
            Opcodes.JUMPI: gas_costs.G_HIGH,
            Opcodes.PC: gas_costs.G_BASE,
            Opcodes.MSIZE: gas_costs.G_BASE,
            Opcodes.GAS: gas_costs.G_BASE,
            Opcodes.JUMPDEST: gas_costs.G_JUMPDEST,
            # Push operations (PUSH1 through PUSH32)
            **{
                getattr(Opcodes, f"PUSH{i}"): gas_costs.G_VERY_LOW
                for i in range(1, 33)
            },
            # Dup operations (DUP1 through DUP16)
            **{
                getattr(Opcodes, f"DUP{i}"): gas_costs.G_VERY_LOW
                for i in range(1, 17)
            },
            # Swap operations (SWAP1 through SWAP16)
            **{
                getattr(Opcodes, f"SWAP{i}"): gas_costs.G_VERY_LOW
                for i in range(1, 17)
            },
            # Logging operations
            Opcodes.LOG0: cls._with_memory_expansion(
                lambda op: (
                    gas_costs.G_LOG
                    + gas_costs.G_LOG_DATA * op.metadata["data_size"]
                ),
                memory_expansion_calculator,
            ),
            Opcodes.LOG1: cls._with_memory_expansion(
                lambda op: (
                    gas_costs.G_LOG
                    + gas_costs.G_LOG_DATA * op.metadata["data_size"]
                    + gas_costs.G_LOG_TOPIC
                ),
                memory_expansion_calculator,
            ),
            Opcodes.LOG2: cls._with_memory_expansion(
                lambda op: (
                    gas_costs.G_LOG
                    + gas_costs.G_LOG_DATA * op.metadata["data_size"]
                    + gas_costs.G_LOG_TOPIC * 2
                ),
                memory_expansion_calculator,
            ),
            Opcodes.LOG3: cls._with_memory_expansion(
                lambda op: (
                    gas_costs.G_LOG
                    + gas_costs.G_LOG_DATA * op.metadata["data_size"]
                    + gas_costs.G_LOG_TOPIC * 3
                ),
                memory_expansion_calculator,
            ),
            Opcodes.LOG4: cls._with_memory_expansion(
                lambda op: (
                    gas_costs.G_LOG
                    + gas_costs.G_LOG_DATA * op.metadata["data_size"]
                    + gas_costs.G_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, *, block_number: int = 0, timestamp: int = 0
    ) -> OpcodeGasCalculator:
        """
        Return callable that calculates the gas cost of a single opcode.
        """
        opcode_gas_map = cls.opcode_gas_map(
            block_number=block_number, timestamp=timestamp
        )

        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, *, block_number: int = 0, timestamp: int = 0
    ) -> 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(
            block_number=block_number, timestamp=timestamp
        )

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

    @classmethod
    def opcode_refund_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> OpcodeGasCalculator:
        """
        Return callable that calculates the gas refund of a single opcode.
        """
        opcode_refund_map = cls.opcode_refund_map(
            block_number=block_number, timestamp=timestamp
        )

        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.R_STORAGE_CLEAR

            if original_value != 0 and current_value == 0:
                # Gas refund issued earlier to be reversed
                refund -= gas_costs.R_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.G_STORAGE_SET - gas_costs.G_WARM_SLOAD
                else:
                    # Slot was originally non-empty and was UPDATED earlier
                    refund += (
                        gas_costs.G_STORAGE_UPDATE
                        - gas_costs.G_COLD_SLOAD
                        - gas_costs.G_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.G_COLD_SLOAD

        if original_value == current_value and current_value != new_value:
            if original_value == 0:
                gas_cost += gas_costs.G_STORAGE_SET
            else:
                gas_cost += gas_costs.G_STORAGE_UPDATE - gas_costs.G_COLD_SLOAD
        else:
            gas_cost += gas_costs.G_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.G_WARM_ACCOUNT_ACCESS
        else:
            base_cost = gas_costs.G_COLD_ACCOUNT_ACCESS

        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.G_CREATE

    @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.G_CODE_DEPOSIT_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.G_SELF_DESTRUCT

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

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

        return base_cost

    @classmethod
    def memory_expansion_gas_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> MemoryExpansionGasCalculator:
        """
        Return callable that calculates the gas cost of memory expansion for
        the fork.
        """
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )

        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.G_MEMORY * w) + ((w * w) // 512)

            return c(new_words) - c(previous_words)

        return fn

    @classmethod
    def calldata_gas_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> CalldataGasCalculator:
        """
        Return callable that calculates the transaction gas cost for its
        calldata depending on its contents.
        """
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )

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

            cost = 0
            for b in Bytes(data):
                if b == 0:
                    cost += gas_costs.G_TX_DATA_ZERO
                else:
                    cost += gas_costs.G_TX_DATA_NON_ZERO
            return cost

        return fn

    @classmethod
    def base_fee_per_gas_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> 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, *, block_number: int = 0, timestamp: int = 0
    ) -> 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, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the base fee max change denominator at a given fork."""
        del block_number, timestamp
        raise NotImplementedError(
            f"Base fee max change denominator is not supported in {cls.name()}"
        )

    @classmethod
    def base_fee_elasticity_multiplier(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the base fee elasticity multiplier at a given fork."""
        del block_number, timestamp
        raise NotImplementedError(
            f"Base fee elasticity multiplier is not supported in {cls.name()}"
        )

    @classmethod
    def transaction_data_floor_cost_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> TransactionDataFloorCostCalculator:
        """At frontier, the transaction data floor cost is a constant zero."""
        del block_number, timestamp

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

        return fn

    @classmethod
    def transaction_intrinsic_cost_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> TransactionIntrinsicCostCalculator:
        """
        Return callable that calculates the intrinsic gas cost of a transaction
        for the fork.
        """
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )
        calldata_gas_calculator = cls.calldata_gas_calculator(
            block_number=block_number, timestamp=timestamp
        )

        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.G_TRANSACTION

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

            return intrinsic_cost + calldata_gas_calculator(data=calldata)

        return fn

    @classmethod
    def blob_gas_price_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> 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, *, block_number: int = 0, timestamp: int = 0
    ) -> 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 min_base_fee_per_blob_gas(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the amount of blob gas used per blob at a given fork."""
        del block_number, timestamp
        raise NotImplementedError(
            f"Base fee per blob gas is not supported in {cls.name()}"
        )

    @classmethod
    def blob_base_fee_update_fraction(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the blob base fee update fraction at a given fork."""
        del block_number, timestamp
        raise NotImplementedError(
            f"Blob base fee update fraction is not supported in {cls.name()}"
        )

    @classmethod
    def blob_gas_per_blob(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the amount of blob gas used per blob at a given fork."""
        del block_number, timestamp
        return 0

    @classmethod
    def supports_blobs(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """Blobs are not supported at Frontier."""
        del block_number, timestamp
        return False

    @classmethod
    def target_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the target number of blobs per block at a given fork."""
        del block_number, timestamp
        raise NotImplementedError(
            f"Target blobs per block is not supported in {cls.name()}"
        )

    @classmethod
    def max_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the max number of blobs per block at a given fork."""
        del block_number, timestamp
        raise NotImplementedError(
            f"Max blobs per block is not supported in {cls.name()}"
        )

    @classmethod
    def blob_reserve_price_active(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """
        Return whether the fork uses a reserve price mechanism for blobs or
        not.
        """
        del block_number, timestamp
        raise NotImplementedError(
            f"Blob reserve price is not supported in {cls.name()}"
        )

    @classmethod
    def blob_base_cost(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the base cost of a blob at a given fork."""
        del block_number, timestamp
        raise NotImplementedError(
            f"Blob base cost is not supported in {cls.name()}"
        )

    @classmethod
    def full_blob_tx_wrapper_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> 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 max_blobs_per_tx(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the max number of blobs per tx at a given fork."""
        del block_number, timestamp
        raise NotImplementedError(
            f"Max blobs per tx is not supported in {cls.name()}"
        )

    @classmethod
    def blob_schedule(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> BlobSchedule | None:
        """At genesis, no blob schedule is used."""
        del block_number, timestamp
        return None

    @classmethod
    def header_requests_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At genesis, header must not contain beacon chain requests."""
        del block_number, timestamp
        return False

    @classmethod
    def header_bal_hash_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At genesis, header must not contain block access list hash."""
        del block_number, timestamp
        return False

    @classmethod
    def engine_new_payload_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Optional[int]:
        """At genesis, payloads cannot be sent through the engine API."""
        del block_number, timestamp
        return None

    @classmethod
    def header_beacon_root_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At genesis, header must not contain parent beacon block root."""
        del block_number, timestamp
        return False

    @classmethod
    def engine_new_payload_blob_hashes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At genesis, payloads do not have blob hashes."""
        del block_number, timestamp
        return False

    @classmethod
    def engine_new_payload_beacon_root(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At genesis, payloads do not have a parent beacon block root."""
        del block_number, timestamp
        return False

    @classmethod
    def engine_new_payload_requests(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At genesis, payloads do not have requests."""
        del block_number, timestamp
        return False

    @classmethod
    def engine_execution_payload_block_access_list(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """At genesis, payloads do not have block access list."""
        del block_number, timestamp
        return False

    @classmethod
    def engine_new_payload_target_blobs_per_block(
        cls,
        *,
        block_number: int = 0,
        timestamp: int = 0,
    ) -> bool:
        """At genesis, payloads do not have target blobs per block."""
        del block_number, timestamp
        return False

    @classmethod
    def engine_payload_attribute_target_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """
        At genesis, payload attributes do not include the target blobs per
        block.
        """
        del block_number, timestamp
        return False

    @classmethod
    def engine_payload_attribute_max_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """
        At genesis, payload attributes do not include the max blobs per block.
        """
        del block_number, timestamp
        return False

    @classmethod
    def engine_forkchoice_updated_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Optional[int]:
        """
        At genesis, forkchoice updates cannot be sent through the engine API.
        """
        return cls.engine_new_payload_version(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def engine_get_payload_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Optional[int]:
        """At genesis, payloads cannot be retrieved through the engine API."""
        return cls.engine_new_payload_version(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def engine_get_blobs_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Optional[int]:
        """At genesis, blobs cannot be retrieved through the engine API."""
        del block_number, timestamp
        return None

    @classmethod
    def get_reward(cls, *, block_number: int = 0, timestamp: int = 0) -> int:
        """
        At Genesis the expected reward amount in wei is
        5_000_000_000_000_000_000.
        """
        del block_number, timestamp
        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, *, block_number: int = 0, timestamp: int = 0
    ) -> List[int]:
        """At Genesis, only legacy transactions are allowed."""
        del block_number, timestamp
        return [0]

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

    @classmethod
    def transaction_gas_limit_cap(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int | None:
        """At Genesis, no transaction gas limit cap is imposed."""
        del block_number, timestamp
        return None

    @classmethod
    def block_rlp_size_limit(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int | None:
        """At Genesis, no RLP block size limit is imposed."""
        del block_number, timestamp
        return None

    @classmethod
    def precompiles(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Address]:
        """At Genesis, no precompiles are present."""
        del block_number, timestamp
        return []

    @classmethod
    def system_contracts(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Address]:
        """At Genesis, no system contracts are present."""
        del block_number, timestamp
        return []

    @classmethod
    def deterministic_factory_predeploy_address(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Address | None:
        """At Genesis, no deterministic factory predeploy is present."""
        del block_number, timestamp
        return None

    @classmethod
    def max_code_size(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> 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)
        """
        del block_number, timestamp
        return 0x6000

    @classmethod
    def max_stack_height(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """At genesis, the maximum stack height is 1024."""
        del block_number, timestamp
        return 1024

    @classmethod
    def max_initcode_size(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """
        At genesis, there is no upper bound for initcode size.

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

    @classmethod
    def call_opcodes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """Return list of call opcodes supported by the fork."""
        del block_number, timestamp
        return [Opcodes.CALL, Opcodes.CALLCODE]

    @classmethod
    def valid_opcodes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """Return list of Opcodes that are valid to work on this fork."""
        del block_number, timestamp
        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, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """At Genesis, only `CREATE` opcode is supported."""
        del block_number, timestamp
        return [Opcodes.CREATE]

    @classmethod
    def max_refund_quotient(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the max refund quotient at Genesis."""
        del block_number, timestamp
        return 2

    @classmethod
    def max_request_type(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """At genesis, no request type is supported, signaled by -1."""
        del block_number, timestamp
        return -1

    @classmethod
    def pre_allocation(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Mapping:
        """
        Return whether the fork expects pre-allocation of accounts.

        Frontier does not require pre-allocated accounts
        """
        del block_number, timestamp
        return {}

    @classmethod
    def pre_allocation_blockchain(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Mapping:
        """
        Return whether the fork expects pre-allocation of accounts.

        Frontier does not require pre-allocated accounts
        """
        del block_number, timestamp
        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,
                block_number=int(block_number),
                timestamp=int(timestamp),
            )
            if default_value is not None:
                defaults[field_name] = default_value

        return FixtureHeader(**defaults)

transition_tool_name(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> str:
    """
    Return fork name as it's meant to be passed to the transition tool for
    execution.
    """
    del block_number, timestamp
    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(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At genesis, header must not contain base fee."""
    del block_number, timestamp
    return False

header_prev_randao_required(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At genesis, header must not contain Prev Randao value."""
    del block_number, timestamp
    return False

header_zero_difficulty_required(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At genesis, header must not have difficulty zero."""
    del block_number, timestamp
    return False

header_withdrawals_required(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At genesis, header must not contain withdrawals."""
    del block_number, timestamp
    return False

header_excess_blob_gas_required(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At genesis, header must not contain excess blob gas."""
    del block_number, timestamp
    return False

header_blob_gas_used_required(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At genesis, header must not contain blob gas used."""
    del block_number, timestamp
    return False

gas_costs(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> GasCosts:
    """
    Return dataclass with the defined gas costs constants for genesis.
    """
    del block_number, timestamp
    return GasCosts(
        G_JUMPDEST=1,
        G_BASE=2,
        G_VERY_LOW=3,
        G_LOW=5,
        G_MID=8,
        G_HIGH=10,
        G_WARM_ACCOUNT_ACCESS=100,
        G_COLD_ACCOUNT_ACCESS=2_600,
        G_ACCESS_LIST_ADDRESS=2_400,
        G_ACCESS_LIST_STORAGE=1_900,
        G_WARM_SLOAD=100,
        G_COLD_SLOAD=2_100,
        G_STORAGE_SET=20_000,
        G_STORAGE_UPDATE=5_000,
        G_STORAGE_RESET=2_900,
        R_STORAGE_CLEAR=4_800,
        G_SELF_DESTRUCT=5_000,
        G_CREATE=32_000,
        G_CODE_DEPOSIT_BYTE=200,
        G_INITCODE_WORD=2,
        G_CALL_VALUE=9_000,
        G_CALL_STIPEND=2_300,
        G_NEW_ACCOUNT=25_000,
        G_EXP=10,
        G_EXP_BYTE=50,
        G_MEMORY=3,
        G_TX_DATA_ZERO=4,
        G_TX_DATA_NON_ZERO=68,
        G_TRANSACTION=21_000,
        G_TRANSACTION_CREATE=32_000,
        G_LOG=375,
        G_LOG_DATA=8,
        G_LOG_TOPIC=375,
        G_KECCAK_256=30,
        G_KECCAK_256_WORD=6,
        G_COPY=3,
        G_BLOCKHASH=20,
        G_PRECOMPILE_ECRECOVER=3_000,
        G_PRECOMPILE_SHA256_BASE=60,
        G_PRECOMPILE_SHA256_WORD=12,
        G_PRECOMPILE_RIPEMD160_BASE=600,
        G_PRECOMPILE_RIPEMD160_WORD=120,
        G_PRECOMPILE_IDENTITY_BASE=15,
        G_PRECOMPILE_IDENTITY_WORD=3,
        # Zero-initialized: introduced in later forks, set via
        # replace() in the fork that activates them.
        G_TX_DATA_STANDARD_TOKEN_COST=0,
        G_TX_DATA_FLOOR_TOKEN_COST=0,
        G_AUTHORIZATION=0,
        R_AUTHORIZATION_EXISTING_AUTHORITY=0,
        G_PRECOMPILE_ECADD=0,
        G_PRECOMPILE_ECMUL=0,
        G_PRECOMPILE_ECPAIRING_BASE=0,
        G_PRECOMPILE_ECPAIRING_PER_POINT=0,
        G_PRECOMPILE_BLAKE2F_BASE=0,
        G_PRECOMPILE_BLAKE2F_PER_ROUND=0,
        G_PRECOMPILE_POINT_EVALUATION=0,
        G_PRECOMPILE_BLS_G1ADD=0,
        G_PRECOMPILE_BLS_G1MUL=0,
        G_PRECOMPILE_BLS_G1MAP=0,
        G_PRECOMPILE_BLS_G2ADD=0,
        G_PRECOMPILE_BLS_G2MUL=0,
        G_PRECOMPILE_BLS_G2MAP=0,
        G_PRECOMPILE_BLS_PAIRING_BASE=0,
        G_PRECOMPILE_BLS_PAIRING_PER_PAIR=0,
        G_PRECOMPILE_P256VERIFY=0,
    )

opcode_gas_map(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> 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(
        block_number=block_number, timestamp=timestamp
    )
    memory_expansion_calculator = cls.memory_expansion_gas_calculator(
        block_number=block_number, timestamp=timestamp
    )

    # 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.G_VERY_LOW,
        Opcodes.MUL: gas_costs.G_LOW,
        Opcodes.SUB: gas_costs.G_VERY_LOW,
        Opcodes.DIV: gas_costs.G_LOW,
        Opcodes.SDIV: gas_costs.G_LOW,
        Opcodes.MOD: gas_costs.G_LOW,
        Opcodes.SMOD: gas_costs.G_LOW,
        Opcodes.ADDMOD: gas_costs.G_MID,
        Opcodes.MULMOD: gas_costs.G_MID,
        Opcodes.EXP: lambda op: (
            gas_costs.G_EXP
            + gas_costs.G_EXP_BYTE
            * ((op.metadata["exponent"].bit_length() + 7) // 8)
        ),
        Opcodes.SIGNEXTEND: gas_costs.G_LOW,
        # Comparison & bitwise logic operations
        Opcodes.LT: gas_costs.G_VERY_LOW,
        Opcodes.GT: gas_costs.G_VERY_LOW,
        Opcodes.SLT: gas_costs.G_VERY_LOW,
        Opcodes.SGT: gas_costs.G_VERY_LOW,
        Opcodes.EQ: gas_costs.G_VERY_LOW,
        Opcodes.ISZERO: gas_costs.G_VERY_LOW,
        Opcodes.AND: gas_costs.G_VERY_LOW,
        Opcodes.OR: gas_costs.G_VERY_LOW,
        Opcodes.XOR: gas_costs.G_VERY_LOW,
        Opcodes.NOT: gas_costs.G_VERY_LOW,
        Opcodes.BYTE: gas_costs.G_VERY_LOW,
        # SHA3
        Opcodes.SHA3: cls._with_memory_expansion(
            lambda op: (
                gas_costs.G_KECCAK_256
                + gas_costs.G_KECCAK_256_WORD
                * ((op.metadata["data_size"] + 31) // 32)
            ),
            memory_expansion_calculator,
        ),
        # Environmental information
        Opcodes.ADDRESS: gas_costs.G_BASE,
        Opcodes.BALANCE: cls._with_account_access(0, gas_costs),
        Opcodes.ORIGIN: gas_costs.G_BASE,
        Opcodes.CALLER: gas_costs.G_BASE,
        Opcodes.CALLVALUE: gas_costs.G_BASE,
        Opcodes.CALLDATALOAD: gas_costs.G_VERY_LOW,
        Opcodes.CALLDATASIZE: gas_costs.G_BASE,
        Opcodes.CALLDATACOPY: cls._with_memory_expansion(
            cls._with_data_copy(gas_costs.G_VERY_LOW, gas_costs),
            memory_expansion_calculator,
        ),
        Opcodes.CODESIZE: gas_costs.G_BASE,
        Opcodes.CODECOPY: cls._with_memory_expansion(
            cls._with_data_copy(gas_costs.G_VERY_LOW, gas_costs),
            memory_expansion_calculator,
        ),
        Opcodes.GASPRICE: gas_costs.G_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.G_BLOCKHASH,
        Opcodes.COINBASE: gas_costs.G_BASE,
        Opcodes.TIMESTAMP: gas_costs.G_BASE,
        Opcodes.NUMBER: gas_costs.G_BASE,
        Opcodes.PREVRANDAO: gas_costs.G_BASE,
        Opcodes.GASLIMIT: gas_costs.G_BASE,
        # Stack, memory, storage and flow operations
        Opcodes.POP: gas_costs.G_BASE,
        Opcodes.MLOAD: cls._with_memory_expansion(
            gas_costs.G_VERY_LOW, memory_expansion_calculator
        ),
        Opcodes.MSTORE: cls._with_memory_expansion(
            gas_costs.G_VERY_LOW, memory_expansion_calculator
        ),
        Opcodes.MSTORE8: cls._with_memory_expansion(
            gas_costs.G_VERY_LOW, memory_expansion_calculator
        ),
        Opcodes.SLOAD: lambda op: (
            gas_costs.G_WARM_SLOAD
            if op.metadata["key_warm"]
            else gas_costs.G_COLD_SLOAD
        ),
        Opcodes.SSTORE: lambda op: cls._calculate_sstore_gas(
            op, gas_costs
        ),
        Opcodes.JUMP: gas_costs.G_MID,
        Opcodes.JUMPI: gas_costs.G_HIGH,
        Opcodes.PC: gas_costs.G_BASE,
        Opcodes.MSIZE: gas_costs.G_BASE,
        Opcodes.GAS: gas_costs.G_BASE,
        Opcodes.JUMPDEST: gas_costs.G_JUMPDEST,
        # Push operations (PUSH1 through PUSH32)
        **{
            getattr(Opcodes, f"PUSH{i}"): gas_costs.G_VERY_LOW
            for i in range(1, 33)
        },
        # Dup operations (DUP1 through DUP16)
        **{
            getattr(Opcodes, f"DUP{i}"): gas_costs.G_VERY_LOW
            for i in range(1, 17)
        },
        # Swap operations (SWAP1 through SWAP16)
        **{
            getattr(Opcodes, f"SWAP{i}"): gas_costs.G_VERY_LOW
            for i in range(1, 17)
        },
        # Logging operations
        Opcodes.LOG0: cls._with_memory_expansion(
            lambda op: (
                gas_costs.G_LOG
                + gas_costs.G_LOG_DATA * op.metadata["data_size"]
            ),
            memory_expansion_calculator,
        ),
        Opcodes.LOG1: cls._with_memory_expansion(
            lambda op: (
                gas_costs.G_LOG
                + gas_costs.G_LOG_DATA * op.metadata["data_size"]
                + gas_costs.G_LOG_TOPIC
            ),
            memory_expansion_calculator,
        ),
        Opcodes.LOG2: cls._with_memory_expansion(
            lambda op: (
                gas_costs.G_LOG
                + gas_costs.G_LOG_DATA * op.metadata["data_size"]
                + gas_costs.G_LOG_TOPIC * 2
            ),
            memory_expansion_calculator,
        ),
        Opcodes.LOG3: cls._with_memory_expansion(
            lambda op: (
                gas_costs.G_LOG
                + gas_costs.G_LOG_DATA * op.metadata["data_size"]
                + gas_costs.G_LOG_TOPIC * 3
            ),
            memory_expansion_calculator,
        ),
        Opcodes.LOG4: cls._with_memory_expansion(
            lambda op: (
                gas_costs.G_LOG
                + gas_costs.G_LOG_DATA * op.metadata["data_size"]
                + gas_costs.G_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(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> OpcodeGasCalculator:
    """
    Return callable that calculates the gas cost of a single opcode.
    """
    opcode_gas_map = cls.opcode_gas_map(
        block_number=block_number, timestamp=timestamp
    )

    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(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> 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(
        block_number=block_number, timestamp=timestamp
    )

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

opcode_refund_calculator(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> OpcodeGasCalculator:
    """
    Return callable that calculates the gas refund of a single opcode.
    """
    opcode_refund_map = cls.opcode_refund_map(
        block_number=block_number, timestamp=timestamp
    )

    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(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> MemoryExpansionGasCalculator:
    """
    Return callable that calculates the gas cost of memory expansion for
    the fork.
    """
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )

    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.G_MEMORY * w) + ((w * w) // 512)

        return c(new_words) - c(previous_words)

    return fn

calldata_gas_calculator(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> CalldataGasCalculator:
    """
    Return callable that calculates the transaction gas cost for its
    calldata depending on its contents.
    """
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )

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

        cost = 0
        for b in Bytes(data):
            if b == 0:
                cost += gas_costs.G_TX_DATA_ZERO
            else:
                cost += gas_costs.G_TX_DATA_NON_ZERO
        return cost

    return fn

base_fee_per_gas_calculator(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> 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(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> 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(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the base fee max change denominator at a given fork."""
    del block_number, timestamp
    raise NotImplementedError(
        f"Base fee max change denominator is not supported in {cls.name()}"
    )

base_fee_elasticity_multiplier(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the base fee elasticity multiplier at a given fork."""
    del block_number, timestamp
    raise NotImplementedError(
        f"Base fee elasticity multiplier is not supported in {cls.name()}"
    )

transaction_data_floor_cost_calculator(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> TransactionDataFloorCostCalculator:
    """At frontier, the transaction data floor cost is a constant zero."""
    del block_number, timestamp

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

    return fn

transaction_intrinsic_cost_calculator(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> TransactionIntrinsicCostCalculator:
    """
    Return callable that calculates the intrinsic gas cost of a transaction
    for the fork.
    """
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )
    calldata_gas_calculator = cls.calldata_gas_calculator(
        block_number=block_number, timestamp=timestamp
    )

    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.G_TRANSACTION

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

        return intrinsic_cost + calldata_gas_calculator(data=calldata)

    return fn

blob_gas_price_calculator(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> 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(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> 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()}"
    )

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

Return the amount of blob gas used per blob at a given fork.

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

@classmethod
def min_base_fee_per_blob_gas(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the amount of blob gas used per blob at a given fork."""
    del block_number, timestamp
    raise NotImplementedError(
        f"Base fee per blob gas is not supported in {cls.name()}"
    )

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

Return the blob base fee update fraction at a given fork.

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

@classmethod
def blob_base_fee_update_fraction(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the blob base fee update fraction at a given fork."""
    del block_number, timestamp
    raise NotImplementedError(
        f"Blob base fee update fraction is not supported in {cls.name()}"
    )

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

Return the amount of blob gas used per blob at a given fork.

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

@classmethod
def blob_gas_per_blob(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the amount of blob gas used per blob at a given fork."""
    del block_number, timestamp
    return 0

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

Blobs are not supported at Frontier.

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

@classmethod
def supports_blobs(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """Blobs are not supported at Frontier."""
    del block_number, timestamp
    return False

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

Return the target number of blobs per block at a given fork.

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

@classmethod
def target_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the target number of blobs per block at a given fork."""
    del block_number, timestamp
    raise NotImplementedError(
        f"Target blobs per block is not supported in {cls.name()}"
    )

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

Return the max number of blobs per block at a given fork.

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

@classmethod
def max_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the max number of blobs per block at a given fork."""
    del block_number, timestamp
    raise NotImplementedError(
        f"Max blobs per block is not supported in {cls.name()}"
    )

blob_reserve_price_active(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """
    Return whether the fork uses a reserve price mechanism for blobs or
    not.
    """
    del block_number, timestamp
    raise NotImplementedError(
        f"Blob reserve price is not supported in {cls.name()}"
    )

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

Return the base cost of a blob at a given fork.

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

@classmethod
def blob_base_cost(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the base cost of a blob at a given fork."""
    del block_number, timestamp
    raise NotImplementedError(
        f"Blob base cost is not supported in {cls.name()}"
    )

full_blob_tx_wrapper_version(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> 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()}"
    )

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

Return the max number of blobs per tx at a given fork.

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

@classmethod
def max_blobs_per_tx(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the max number of blobs per tx at a given fork."""
    del block_number, timestamp
    raise NotImplementedError(
        f"Max blobs per tx is not supported in {cls.name()}"
    )

blob_schedule(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> BlobSchedule | None:
    """At genesis, no blob schedule is used."""
    del block_number, timestamp
    return None

header_requests_required(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At genesis, header must not contain beacon chain requests."""
    del block_number, timestamp
    return False

header_bal_hash_required(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At genesis, header must not contain block access list hash."""
    del block_number, timestamp
    return False

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

At genesis, payloads cannot be sent through the engine API.

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

@classmethod
def engine_new_payload_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Optional[int]:
    """At genesis, payloads cannot be sent through the engine API."""
    del block_number, timestamp
    return None

header_beacon_root_required(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At genesis, header must not contain parent beacon block root."""
    del block_number, timestamp
    return False

engine_new_payload_blob_hashes(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At genesis, payloads do not have blob hashes."""
    del block_number, timestamp
    return False

engine_new_payload_beacon_root(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At genesis, payloads do not have a parent beacon block root."""
    del block_number, timestamp
    return False

engine_new_payload_requests(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At genesis, payloads do not have requests."""
    del block_number, timestamp
    return False

engine_execution_payload_block_access_list(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """At genesis, payloads do not have block access list."""
    del block_number, timestamp
    return False

engine_new_payload_target_blobs_per_block(*, block_number=0, timestamp=0) 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,
    *,
    block_number: int = 0,
    timestamp: int = 0,
) -> bool:
    """At genesis, payloads do not have target blobs per block."""
    del block_number, timestamp
    return False

engine_payload_attribute_target_blobs_per_block(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """
    At genesis, payload attributes do not include the target blobs per
    block.
    """
    del block_number, timestamp
    return False

engine_payload_attribute_max_blobs_per_block(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """
    At genesis, payload attributes do not include the max blobs per block.
    """
    del block_number, timestamp
    return False

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

At genesis, forkchoice updates cannot be sent through the engine API.

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

@classmethod
def engine_forkchoice_updated_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Optional[int]:
    """
    At genesis, forkchoice updates cannot be sent through the engine API.
    """
    return cls.engine_new_payload_version(
        block_number=block_number, timestamp=timestamp
    )

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

At genesis, payloads cannot be retrieved through the engine API.

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

@classmethod
def engine_get_payload_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Optional[int]:
    """At genesis, payloads cannot be retrieved through the engine API."""
    return cls.engine_new_payload_version(
        block_number=block_number, timestamp=timestamp
    )

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

At genesis, blobs cannot be retrieved through the engine API.

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

@classmethod
def engine_get_blobs_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Optional[int]:
    """At genesis, blobs cannot be retrieved through the engine API."""
    del block_number, timestamp
    return None

get_reward(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0) -> int:
    """
    At Genesis the expected reward amount in wei is
    5_000_000_000_000_000_000.
    """
    del block_number, timestamp
    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(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> List[int]:
    """At Genesis, only legacy transactions are allowed."""
    del block_number, timestamp
    return [0]

contract_creating_tx_types(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> List[int]:
    """At Genesis, only legacy transactions are allowed."""
    del block_number, timestamp
    return [0]

transaction_gas_limit_cap(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> int | None:
    """At Genesis, no transaction gas limit cap is imposed."""
    del block_number, timestamp
    return None

block_rlp_size_limit(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> int | None:
    """At Genesis, no RLP block size limit is imposed."""
    del block_number, timestamp
    return None

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

At Genesis, no precompiles are present.

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

@classmethod
def precompiles(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[Address]:
    """At Genesis, no precompiles are present."""
    del block_number, timestamp
    return []

system_contracts(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> List[Address]:
    """At Genesis, no system contracts are present."""
    del block_number, timestamp
    return []

deterministic_factory_predeploy_address(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> Address | None:
    """At Genesis, no deterministic factory predeploy is present."""
    del block_number, timestamp
    return None

max_code_size(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> 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)
    """
    del block_number, timestamp
    return 0x6000

max_stack_height(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """At genesis, the maximum stack height is 1024."""
    del block_number, timestamp
    return 1024

max_initcode_size(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """
    At genesis, there is no upper bound for initcode size.

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

call_opcodes(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """Return list of call opcodes supported by the fork."""
    del block_number, timestamp
    return [Opcodes.CALL, Opcodes.CALLCODE]

valid_opcodes(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """Return list of Opcodes that are valid to work on this fork."""
    del block_number, timestamp
    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(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """At Genesis, only `CREATE` opcode is supported."""
    del block_number, timestamp
    return [Opcodes.CREATE]

max_refund_quotient(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the max refund quotient at Genesis."""
    del block_number, timestamp
    return 2

max_request_type(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """At genesis, no request type is supported, signaled by -1."""
    del block_number, timestamp
    return -1

pre_allocation(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> Mapping:
    """
    Return whether the fork expects pre-allocation of accounts.

    Frontier does not require pre-allocated accounts
    """
    del block_number, timestamp
    return {}

pre_allocation_blockchain(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> Mapping:
    """
    Return whether the fork expects pre-allocation of accounts.

    Frontier does not require pre-allocated accounts
    """
    del block_number, timestamp
    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,
            block_number=int(block_number),
            timestamp=int(timestamp),
        )
        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: Frontier

Homestead fork.

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

class Homestead(Frontier):
    """Homestead fork."""

    @classmethod
    def precompiles(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Address]:
        """
        At Homestead, 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"),
        ] + super(Homestead, cls).precompiles(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def call_opcodes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """At Homestead, DELEGATECALL opcode was introduced."""
        return [Opcodes.DELEGATECALL] + super(Homestead, cls).call_opcodes(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def opcode_gas_map(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
        """Add DELEGATECALL opcode gas cost for Homestead."""
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )
        memory_expansion_calculator = cls.memory_expansion_gas_calculator(
            block_number=block_number, timestamp=timestamp
        )
        base_map = super(Homestead, cls).opcode_gas_map(
            block_number=block_number, timestamp=timestamp
        )
        return {
            **base_map,
            Opcodes.DELEGATECALL: cls._with_memory_expansion(
                lambda op: cls._calculate_call_gas(op, gas_costs),
                memory_expansion_calculator,
            ),
        }

    @classmethod
    def valid_opcodes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """Return the list of Opcodes that are valid to work on this fork."""
        del block_number, timestamp
        return [Opcodes.DELEGATECALL] + super(Homestead, cls).valid_opcodes()

    @classmethod
    def transaction_intrinsic_cost_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> TransactionIntrinsicCostCalculator:
        """
        At Homestead, the transaction intrinsic cost needs to take contract
        creation into account.
        """
        super_fn = super(Homestead, cls).transaction_intrinsic_cost_calculator(
            block_number=block_number, timestamp=timestamp
        )
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )

        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

            intrinsic_cost: int = super_fn(
                calldata=calldata,
                contract_creation=contract_creation,
                access_list=access_list,
                authorization_list_or_count=authorization_list_or_count,
            )
            if contract_creation:
                intrinsic_cost += gas_costs.G_TRANSACTION_CREATE
            return intrinsic_cost

        return fn

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

At Homestead, 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, *, block_number: int = 0, timestamp: int = 0
) -> List[Address]:
    """
    At Homestead, 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"),
    ] + super(Homestead, cls).precompiles(
        block_number=block_number, timestamp=timestamp
    )

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

At Homestead, DELEGATECALL opcode was introduced.

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

@classmethod
def call_opcodes(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """At Homestead, DELEGATECALL opcode was introduced."""
    return [Opcodes.DELEGATECALL] + super(Homestead, cls).call_opcodes(
        block_number=block_number, timestamp=timestamp
    )

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

Add DELEGATECALL opcode gas cost for Homestead.

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

@classmethod
def opcode_gas_map(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
    """Add DELEGATECALL opcode gas cost for Homestead."""
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )
    memory_expansion_calculator = cls.memory_expansion_gas_calculator(
        block_number=block_number, timestamp=timestamp
    )
    base_map = super(Homestead, cls).opcode_gas_map(
        block_number=block_number, timestamp=timestamp
    )
    return {
        **base_map,
        Opcodes.DELEGATECALL: cls._with_memory_expansion(
            lambda op: cls._calculate_call_gas(op, gas_costs),
            memory_expansion_calculator,
        ),
    }

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

Return the 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, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """Return the list of Opcodes that are valid to work on this fork."""
    del block_number, timestamp
    return [Opcodes.DELEGATECALL] + super(Homestead, cls).valid_opcodes()

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

At Homestead, the transaction intrinsic cost needs to take contract creation into account.

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

@classmethod
def transaction_intrinsic_cost_calculator(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> TransactionIntrinsicCostCalculator:
    """
    At Homestead, the transaction intrinsic cost needs to take contract
    creation into account.
    """
    super_fn = super(Homestead, cls).transaction_intrinsic_cost_calculator(
        block_number=block_number, timestamp=timestamp
    )
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )

    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

        intrinsic_cost: int = super_fn(
            calldata=calldata,
            contract_creation=contract_creation,
            access_list=access_list,
            authorization_list_or_count=authorization_list_or_count,
        )
        if contract_creation:
            intrinsic_cost += gas_costs.G_TRANSACTION_CREATE
        return intrinsic_cost

    return fn

Istanbul

Bases: ConstantinopleFix

Istanbul fork.

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

class Istanbul(ConstantinopleFix):
    """Istanbul fork."""

    @classmethod
    def precompiles(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Address]:
        """At Istanbul, a precompile for blake2 compression is introduced."""
        return [
            Address(9, label="BLAKE2F"),
        ] + super(Istanbul, cls).precompiles(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def opcode_gas_map(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
        """Add Istanbul opcodes gas costs."""
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )
        base_map = super(Istanbul, cls).opcode_gas_map(
            block_number=block_number, timestamp=timestamp
        )
        return {
            **base_map,
            Opcodes.CHAINID: gas_costs.G_BASE,
            Opcodes.SELFBALANCE: gas_costs.G_LOW,
        }

    @classmethod
    def valid_opcodes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """Return list of Opcodes that are valid to work on this fork."""
        del block_number, timestamp
        return [Opcodes.CHAINID, Opcodes.SELFBALANCE] + super(
            Istanbul, cls
        ).valid_opcodes()

    @classmethod
    def gas_costs(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> GasCosts:
        """
        On Istanbul, the non-zero transaction data byte cost is reduced to 16
        due to EIP-2028.
        """
        return replace(
            super(Istanbul, cls).gas_costs(
                block_number=block_number, timestamp=timestamp
            ),
            G_TX_DATA_NON_ZERO=16,  # https://eips.ethereum.org/EIPS/eip-2028
            # https://eips.ethereum.org/EIPS/eip-1108
            G_PRECOMPILE_ECADD=150,
            G_PRECOMPILE_ECMUL=6000,
            G_PRECOMPILE_ECPAIRING_BASE=45_000,
            G_PRECOMPILE_ECPAIRING_PER_POINT=34_000,
            G_PRECOMPILE_BLAKE2F_PER_ROUND=1,
        )

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

At Istanbul, a precompile for blake2 compression is introduced.

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

@classmethod
def precompiles(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[Address]:
    """At Istanbul, a precompile for blake2 compression is introduced."""
    return [
        Address(9, label="BLAKE2F"),
    ] + super(Istanbul, cls).precompiles(
        block_number=block_number, timestamp=timestamp
    )

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

Add Istanbul opcodes gas costs.

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

@classmethod
def opcode_gas_map(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
    """Add Istanbul opcodes gas costs."""
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )
    base_map = super(Istanbul, cls).opcode_gas_map(
        block_number=block_number, timestamp=timestamp
    )
    return {
        **base_map,
        Opcodes.CHAINID: gas_costs.G_BASE,
        Opcodes.SELFBALANCE: gas_costs.G_LOW,
    }

valid_opcodes(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """Return list of Opcodes that are valid to work on this fork."""
    del block_number, timestamp
    return [Opcodes.CHAINID, Opcodes.SELFBALANCE] + super(
        Istanbul, cls
    ).valid_opcodes()

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

On Istanbul, the non-zero transaction data byte cost is reduced to 16 due to EIP-2028.

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

@classmethod
def gas_costs(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> GasCosts:
    """
    On Istanbul, the non-zero transaction data byte cost is reduced to 16
    due to EIP-2028.
    """
    return replace(
        super(Istanbul, cls).gas_costs(
            block_number=block_number, timestamp=timestamp
        ),
        G_TX_DATA_NON_ZERO=16,  # https://eips.ethereum.org/EIPS/eip-2028
        # https://eips.ethereum.org/EIPS/eip-1108
        G_PRECOMPILE_ECADD=150,
        G_PRECOMPILE_ECMUL=6000,
        G_PRECOMPILE_ECPAIRING_BASE=45_000,
        G_PRECOMPILE_ECPAIRING_PER_POINT=34_000,
        G_PRECOMPILE_BLAKE2F_PER_ROUND=1,
    )

London

Bases: Berlin

London fork.

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

class London(Berlin):
    """London fork."""

    @classmethod
    def header_base_fee_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """Header must contain the Base Fee starting from London."""
        del block_number, timestamp
        return True

    @classmethod
    def tx_types(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[int]:
        """At London, dynamic fee transactions are introduced."""
        return [2] + super(London, cls).tx_types(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def contract_creating_tx_types(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[int]:
        """At London, dynamic fee transactions are introduced."""
        return [2] + super(London, cls).contract_creating_tx_types(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def opcode_gas_map(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
        """Add London opcodes gas costs."""
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )
        base_map = super(London, cls).opcode_gas_map(
            block_number=block_number, timestamp=timestamp
        )
        return {
            **base_map,
            Opcodes.BASEFEE: gas_costs.G_BASE,
        }

    @classmethod
    def valid_opcodes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """Return list of Opcodes that are valid to work on this fork."""
        del block_number, timestamp
        return [Opcodes.BASEFEE] + super(London, cls).valid_opcodes()

    @classmethod
    def max_refund_quotient(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the max refund quotient at London."""
        del block_number, timestamp
        return 5

    @classmethod
    def base_fee_max_change_denominator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the base fee max change denominator at London."""
        del block_number, timestamp
        return 8

    @classmethod
    def base_fee_elasticity_multiplier(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the base fee elasticity multiplier at London."""
        del block_number, timestamp
        return 2

    @classmethod
    def base_fee_per_gas_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> BaseFeePerGasCalculator:
        """
        Return a callable that calculates the base fee per gas at London.

        EIP-1559 block validation pseudo code:

        if INITIAL_FORK_BLOCK_NUMBER == block.number:
            expected_base_fee_per_gas = INITIAL_BASE_FEE
        elif parent_gas_used == parent_gas_target:
            expected_base_fee_per_gas = parent_base_fee_per_gas
        elif parent_gas_used > parent_gas_target:
            gas_used_delta = parent_gas_used - parent_gas_target
            base_fee_per_gas_delta = max( parent_base_fee_per_gas
                                  * gas_used_delta // parent_gas_target //
                                  BASE_FEE_MAX_CHANGE_DENOMINATOR, 1, )
            expected_base_fee_per_gas = parent_base_fee_per_gas +
                                       base_fee_per_gas_delta
        else:
            gas_used_delta = parent_gas_target - parent_gas_used
            base_fee_per_gas_delta = (
                              parent_base_fee_per_gas * gas_used_delta //
                              parent_gas_target //
                              BASE_FEE_MAX_CHANGE_DENOMINATOR
                              )
            expected_base_fee_per_gas = parent_base_fee_per_gas -
                                        base_fee_per_gas_delta
        """
        base_fee_max_change_denominator = cls.base_fee_max_change_denominator(
            block_number=block_number, timestamp=timestamp
        )
        elasticity_multiplier = cls.base_fee_elasticity_multiplier(
            block_number=block_number, timestamp=timestamp
        )

        def fn(
            *,
            parent_base_fee_per_gas: int,
            parent_gas_used: int,
            parent_gas_limit: int,
        ) -> int:
            parent_gas_target = parent_gas_limit // elasticity_multiplier
            if parent_gas_used == parent_gas_target:
                return parent_base_fee_per_gas
            elif parent_gas_used > parent_gas_target:
                gas_used_delta = parent_gas_used - parent_gas_target
                base_fee_per_gas_delta = max(
                    parent_base_fee_per_gas
                    * gas_used_delta
                    // parent_gas_target
                    // base_fee_max_change_denominator,
                    1,
                )
                return parent_base_fee_per_gas + base_fee_per_gas_delta
            else:
                gas_used_delta = parent_gas_target - parent_gas_used
                base_fee_per_gas_delta = (
                    parent_base_fee_per_gas
                    * gas_used_delta
                    // parent_gas_target
                    // base_fee_max_change_denominator
                )
                return parent_base_fee_per_gas - base_fee_per_gas_delta

        return fn

    @classmethod
    def base_fee_change_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> BaseFeeChangeCalculator:
        """
        Return a callable that calculates the gas that needs to be used to
        change the base fee.
        """
        base_fee_max_change_denominator = cls.base_fee_max_change_denominator(
            block_number=block_number, timestamp=timestamp
        )
        elasticity_multiplier = cls.base_fee_elasticity_multiplier(
            block_number=block_number, timestamp=timestamp
        )
        base_fee_per_gas_calculator = cls.base_fee_per_gas_calculator(
            block_number=block_number, timestamp=timestamp
        )

        def fn(
            *,
            parent_base_fee_per_gas: int,
            parent_gas_limit: int,
            required_base_fee_per_gas: int,
        ) -> int:
            parent_gas_target = parent_gas_limit // elasticity_multiplier

            if parent_base_fee_per_gas == required_base_fee_per_gas:
                return parent_gas_target
            elif required_base_fee_per_gas > parent_base_fee_per_gas:
                # Base fee needs to go up, so we need to use more than target
                base_fee_per_gas_delta = (
                    required_base_fee_per_gas - parent_base_fee_per_gas
                )
                parent_gas_used = (
                    (
                        base_fee_per_gas_delta
                        * base_fee_max_change_denominator
                        * parent_gas_target
                    )
                    // parent_base_fee_per_gas
                ) + parent_gas_target
            elif required_base_fee_per_gas < parent_base_fee_per_gas:
                # Base fee needs to go down, so we need to use less than target
                base_fee_per_gas_delta = (
                    parent_base_fee_per_gas - required_base_fee_per_gas
                )

                parent_gas_used = (
                    parent_gas_target
                    - (
                        (
                            base_fee_per_gas_delta
                            * base_fee_max_change_denominator
                            * parent_gas_target
                        )
                        // parent_base_fee_per_gas
                    )
                    - 1
                )

            assert (
                base_fee_per_gas_calculator(
                    parent_base_fee_per_gas=parent_base_fee_per_gas,
                    parent_gas_used=parent_gas_used,
                    parent_gas_limit=parent_gas_limit,
                )
                == required_base_fee_per_gas
            )

            return parent_gas_used

        return fn

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

Header must contain the Base Fee starting from London.

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

@classmethod
def header_base_fee_required(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """Header must contain the Base Fee starting from London."""
    del block_number, timestamp
    return True

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

At London, dynamic fee transactions are introduced.

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

@classmethod
def tx_types(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[int]:
    """At London, dynamic fee transactions are introduced."""
    return [2] + super(London, cls).tx_types(
        block_number=block_number, timestamp=timestamp
    )

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

At London, dynamic fee transactions are introduced.

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

@classmethod
def contract_creating_tx_types(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[int]:
    """At London, dynamic fee transactions are introduced."""
    return [2] + super(London, cls).contract_creating_tx_types(
        block_number=block_number, timestamp=timestamp
    )

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

Add London opcodes gas costs.

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

@classmethod
def opcode_gas_map(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
    """Add London opcodes gas costs."""
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )
    base_map = super(London, cls).opcode_gas_map(
        block_number=block_number, timestamp=timestamp
    )
    return {
        **base_map,
        Opcodes.BASEFEE: gas_costs.G_BASE,
    }

valid_opcodes(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """Return list of Opcodes that are valid to work on this fork."""
    del block_number, timestamp
    return [Opcodes.BASEFEE] + super(London, cls).valid_opcodes()

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

Return the max refund quotient at London.

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

@classmethod
def max_refund_quotient(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the max refund quotient at London."""
    del block_number, timestamp
    return 5

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

Return the base fee max change denominator at London.

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

@classmethod
def base_fee_max_change_denominator(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the base fee max change denominator at London."""
    del block_number, timestamp
    return 8

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

Return the base fee elasticity multiplier at London.

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

@classmethod
def base_fee_elasticity_multiplier(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the base fee elasticity multiplier at London."""
    del block_number, timestamp
    return 2

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

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

EIP-1559 block validation pseudo code:

if INITIAL_FORK_BLOCK_NUMBER == block.number: expected_base_fee_per_gas = INITIAL_BASE_FEE elif parent_gas_used == parent_gas_target: expected_base_fee_per_gas = parent_base_fee_per_gas elif parent_gas_used > parent_gas_target: gas_used_delta = parent_gas_used - parent_gas_target base_fee_per_gas_delta = max( parent_base_fee_per_gas * gas_used_delta // parent_gas_target // BASE_FEE_MAX_CHANGE_DENOMINATOR, 1, ) expected_base_fee_per_gas = parent_base_fee_per_gas + base_fee_per_gas_delta else: gas_used_delta = parent_gas_target - parent_gas_used base_fee_per_gas_delta = ( parent_base_fee_per_gas * gas_used_delta // parent_gas_target // BASE_FEE_MAX_CHANGE_DENOMINATOR ) expected_base_fee_per_gas = parent_base_fee_per_gas - base_fee_per_gas_delta

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

@classmethod
def base_fee_per_gas_calculator(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> BaseFeePerGasCalculator:
    """
    Return a callable that calculates the base fee per gas at London.

    EIP-1559 block validation pseudo code:

    if INITIAL_FORK_BLOCK_NUMBER == block.number:
        expected_base_fee_per_gas = INITIAL_BASE_FEE
    elif parent_gas_used == parent_gas_target:
        expected_base_fee_per_gas = parent_base_fee_per_gas
    elif parent_gas_used > parent_gas_target:
        gas_used_delta = parent_gas_used - parent_gas_target
        base_fee_per_gas_delta = max( parent_base_fee_per_gas
                              * gas_used_delta // parent_gas_target //
                              BASE_FEE_MAX_CHANGE_DENOMINATOR, 1, )
        expected_base_fee_per_gas = parent_base_fee_per_gas +
                                   base_fee_per_gas_delta
    else:
        gas_used_delta = parent_gas_target - parent_gas_used
        base_fee_per_gas_delta = (
                          parent_base_fee_per_gas * gas_used_delta //
                          parent_gas_target //
                          BASE_FEE_MAX_CHANGE_DENOMINATOR
                          )
        expected_base_fee_per_gas = parent_base_fee_per_gas -
                                    base_fee_per_gas_delta
    """
    base_fee_max_change_denominator = cls.base_fee_max_change_denominator(
        block_number=block_number, timestamp=timestamp
    )
    elasticity_multiplier = cls.base_fee_elasticity_multiplier(
        block_number=block_number, timestamp=timestamp
    )

    def fn(
        *,
        parent_base_fee_per_gas: int,
        parent_gas_used: int,
        parent_gas_limit: int,
    ) -> int:
        parent_gas_target = parent_gas_limit // elasticity_multiplier
        if parent_gas_used == parent_gas_target:
            return parent_base_fee_per_gas
        elif parent_gas_used > parent_gas_target:
            gas_used_delta = parent_gas_used - parent_gas_target
            base_fee_per_gas_delta = max(
                parent_base_fee_per_gas
                * gas_used_delta
                // parent_gas_target
                // base_fee_max_change_denominator,
                1,
            )
            return parent_base_fee_per_gas + base_fee_per_gas_delta
        else:
            gas_used_delta = parent_gas_target - parent_gas_used
            base_fee_per_gas_delta = (
                parent_base_fee_per_gas
                * gas_used_delta
                // parent_gas_target
                // base_fee_max_change_denominator
            )
            return parent_base_fee_per_gas - base_fee_per_gas_delta

    return fn

base_fee_change_calculator(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> BaseFeeChangeCalculator:
    """
    Return a callable that calculates the gas that needs to be used to
    change the base fee.
    """
    base_fee_max_change_denominator = cls.base_fee_max_change_denominator(
        block_number=block_number, timestamp=timestamp
    )
    elasticity_multiplier = cls.base_fee_elasticity_multiplier(
        block_number=block_number, timestamp=timestamp
    )
    base_fee_per_gas_calculator = cls.base_fee_per_gas_calculator(
        block_number=block_number, timestamp=timestamp
    )

    def fn(
        *,
        parent_base_fee_per_gas: int,
        parent_gas_limit: int,
        required_base_fee_per_gas: int,
    ) -> int:
        parent_gas_target = parent_gas_limit // elasticity_multiplier

        if parent_base_fee_per_gas == required_base_fee_per_gas:
            return parent_gas_target
        elif required_base_fee_per_gas > parent_base_fee_per_gas:
            # Base fee needs to go up, so we need to use more than target
            base_fee_per_gas_delta = (
                required_base_fee_per_gas - parent_base_fee_per_gas
            )
            parent_gas_used = (
                (
                    base_fee_per_gas_delta
                    * base_fee_max_change_denominator
                    * parent_gas_target
                )
                // parent_base_fee_per_gas
            ) + parent_gas_target
        elif required_base_fee_per_gas < parent_base_fee_per_gas:
            # Base fee needs to go down, so we need to use less than target
            base_fee_per_gas_delta = (
                parent_base_fee_per_gas - required_base_fee_per_gas
            )

            parent_gas_used = (
                parent_gas_target
                - (
                    (
                        base_fee_per_gas_delta
                        * base_fee_max_change_denominator
                        * parent_gas_target
                    )
                    // parent_base_fee_per_gas
                )
                - 1
            )

        assert (
            base_fee_per_gas_calculator(
                parent_base_fee_per_gas=parent_base_fee_per_gas,
                parent_gas_used=parent_gas_used,
                parent_gas_limit=parent_gas_limit,
            )
            == required_base_fee_per_gas
        )

        return parent_gas_used

    return fn

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: Prague

Osaka fork.

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

class Osaka(Prague, solc_name="cancun"):
    """Osaka fork."""

    # update some blob constants
    BLOB_CONSTANTS = {
        **Prague.BLOB_CONSTANTS,  # same base constants as prague
        "AMOUNT_CELL_PROOFS": 128,
    }

    @classmethod
    def engine_get_payload_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Optional[int]:
        """From Osaka, get payload calls must use version 5."""
        del block_number, timestamp
        return 5

    @classmethod
    def engine_get_blobs_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Optional[int]:
        """At Osaka, the engine get blobs version is 2."""
        del block_number, timestamp
        return 2

    @classmethod
    def full_blob_tx_wrapper_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int | None:
        """At Osaka, the full blob transaction wrapper version is defined."""
        del block_number, timestamp
        return 1

    @classmethod
    def transaction_gas_limit_cap(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int | None:
        """At Osaka, transaction gas limit is capped at 16 million (2**24)."""
        del block_number, timestamp
        return 16_777_216

    @classmethod
    def block_rlp_size_limit(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int | None:
        """From Osaka, block RLP size is limited as specified in EIP-7934."""
        del block_number, timestamp

        max_block_size = 10_485_760
        safety_margin = 2_097_152
        return max_block_size - safety_margin

    @classmethod
    def opcode_gas_map(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
        """Add Osaka opcodes gas costs."""
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )
        base_map = super(Osaka, cls).opcode_gas_map(
            block_number=block_number, timestamp=timestamp
        )
        return {
            **base_map,
            Opcodes.CLZ: gas_costs.G_LOW,
        }

    @classmethod
    def valid_opcodes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """Return list of Opcodes that are valid to work on this fork."""
        del block_number, timestamp
        return [
            Opcodes.CLZ,
        ] + super(Prague, cls).valid_opcodes()

    @classmethod
    def precompiles(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Address]:
        """
        At Osaka, a precompile for p256verify operation is added.

        P256VERIFY = 0x100
        """
        return [
            Address(0x100, label="P256VERIFY"),
        ] + super(Osaka, cls).precompiles(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def gas_costs(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> GasCosts:
        """On Osaka, the P256VERIFY precompile gas cost is set."""
        return replace(
            super(Osaka, cls).gas_costs(
                block_number=block_number, timestamp=timestamp
            ),
            G_PRECOMPILE_P256VERIFY=6_900,
        )

    @classmethod
    def excess_blob_gas_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> ExcessBlobGasCalculator:
        """
        Return a callable that calculates the excess blob gas for a block.
        """
        target_blobs_per_block = cls.target_blobs_per_block(
            block_number=block_number, timestamp=timestamp
        )
        blob_gas_per_blob = cls.blob_gas_per_blob(
            block_number=block_number, timestamp=timestamp
        )
        target_blob_gas_per_block = target_blobs_per_block * blob_gas_per_blob
        max_blobs_per_block = cls.max_blobs_per_block(
            block_number=block_number, timestamp=timestamp
        )
        blob_base_cost = 2**13  # EIP-7918 new parameter

        def fn(
            *,
            parent_excess_blob_gas: int | None = None,
            parent_excess_blobs: int | None = None,
            parent_blob_gas_used: int | None = None,
            parent_blob_count: int | None = None,
            parent_base_fee_per_gas: int,  # EIP-7918 additional parameter
        ) -> int:
            if parent_excess_blob_gas is None:
                assert parent_excess_blobs is not None, (
                    "Parent excess blobs are required"
                )
                parent_excess_blob_gas = (
                    parent_excess_blobs * blob_gas_per_blob
                )
            if parent_blob_gas_used is None:
                assert parent_blob_count is not None, (
                    "Parent blob count is required"
                )
                parent_blob_gas_used = parent_blob_count * blob_gas_per_blob
            if (
                parent_excess_blob_gas + parent_blob_gas_used
                < target_blob_gas_per_block
            ):
                return 0

            # EIP-7918: Apply reserve price when execution costs dominate blob
            # costs
            current_blob_base_fee = cls.blob_gas_price_calculator()(
                excess_blob_gas=parent_excess_blob_gas
            )
            reserve_price_active = (
                blob_base_cost * parent_base_fee_per_gas
                > blob_gas_per_blob * current_blob_base_fee
            )
            if reserve_price_active:
                blob_excess_adjustment = (
                    parent_blob_gas_used
                    * (max_blobs_per_block - target_blobs_per_block)
                    // max_blobs_per_block
                )
                return parent_excess_blob_gas + blob_excess_adjustment

            # Original EIP-4844 calculation
            return (
                parent_excess_blob_gas
                + parent_blob_gas_used
                - target_blob_gas_per_block
            )

        return fn

    @classmethod
    def max_blobs_per_tx(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """
        Blobs in Osaka, have a static max of 6 blobs per tx. Differs from the
        max per block.
        """
        del block_number, timestamp
        return 6

    @classmethod
    def blob_reserve_price_active(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """Blob reserve price is supported in Osaka."""
        del block_number, timestamp
        return True

    @classmethod
    def blob_base_cost(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the base cost of a blob at a given fork."""
        del block_number, timestamp
        return 2**13  # EIP-7918 new parameter

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

From Osaka, get payload calls must use version 5.

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

@classmethod
def engine_get_payload_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Optional[int]:
    """From Osaka, get payload calls must use version 5."""
    del block_number, timestamp
    return 5

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

At Osaka, the engine get blobs version is 2.

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

@classmethod
def engine_get_blobs_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Optional[int]:
    """At Osaka, the engine get blobs version is 2."""
    del block_number, timestamp
    return 2

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

At Osaka, the full blob transaction wrapper version is defined.

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

@classmethod
def full_blob_tx_wrapper_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int | None:
    """At Osaka, the full blob transaction wrapper version is defined."""
    del block_number, timestamp
    return 1

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

At Osaka, transaction gas limit is capped at 16 million (2**24).

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

@classmethod
def transaction_gas_limit_cap(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int | None:
    """At Osaka, transaction gas limit is capped at 16 million (2**24)."""
    del block_number, timestamp
    return 16_777_216

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

From Osaka, block RLP size is limited as specified in EIP-7934.

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

@classmethod
def block_rlp_size_limit(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int | None:
    """From Osaka, block RLP size is limited as specified in EIP-7934."""
    del block_number, timestamp

    max_block_size = 10_485_760
    safety_margin = 2_097_152
    return max_block_size - safety_margin

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

Add Osaka opcodes gas costs.

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

@classmethod
def opcode_gas_map(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
    """Add Osaka opcodes gas costs."""
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )
    base_map = super(Osaka, cls).opcode_gas_map(
        block_number=block_number, timestamp=timestamp
    )
    return {
        **base_map,
        Opcodes.CLZ: gas_costs.G_LOW,
    }

valid_opcodes(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """Return list of Opcodes that are valid to work on this fork."""
    del block_number, timestamp
    return [
        Opcodes.CLZ,
    ] + super(Prague, cls).valid_opcodes()

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

At Osaka, a precompile for p256verify operation is added.

P256VERIFY = 0x100

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

@classmethod
def precompiles(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[Address]:
    """
    At Osaka, a precompile for p256verify operation is added.

    P256VERIFY = 0x100
    """
    return [
        Address(0x100, label="P256VERIFY"),
    ] + super(Osaka, cls).precompiles(
        block_number=block_number, timestamp=timestamp
    )

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

On Osaka, the P256VERIFY precompile gas cost is set.

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

@classmethod
def gas_costs(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> GasCosts:
    """On Osaka, the P256VERIFY precompile gas cost is set."""
    return replace(
        super(Osaka, cls).gas_costs(
            block_number=block_number, timestamp=timestamp
        ),
        G_PRECOMPILE_P256VERIFY=6_900,
    )

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

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

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

@classmethod
def excess_blob_gas_calculator(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> ExcessBlobGasCalculator:
    """
    Return a callable that calculates the excess blob gas for a block.
    """
    target_blobs_per_block = cls.target_blobs_per_block(
        block_number=block_number, timestamp=timestamp
    )
    blob_gas_per_blob = cls.blob_gas_per_blob(
        block_number=block_number, timestamp=timestamp
    )
    target_blob_gas_per_block = target_blobs_per_block * blob_gas_per_blob
    max_blobs_per_block = cls.max_blobs_per_block(
        block_number=block_number, timestamp=timestamp
    )
    blob_base_cost = 2**13  # EIP-7918 new parameter

    def fn(
        *,
        parent_excess_blob_gas: int | None = None,
        parent_excess_blobs: int | None = None,
        parent_blob_gas_used: int | None = None,
        parent_blob_count: int | None = None,
        parent_base_fee_per_gas: int,  # EIP-7918 additional parameter
    ) -> int:
        if parent_excess_blob_gas is None:
            assert parent_excess_blobs is not None, (
                "Parent excess blobs are required"
            )
            parent_excess_blob_gas = (
                parent_excess_blobs * blob_gas_per_blob
            )
        if parent_blob_gas_used is None:
            assert parent_blob_count is not None, (
                "Parent blob count is required"
            )
            parent_blob_gas_used = parent_blob_count * blob_gas_per_blob
        if (
            parent_excess_blob_gas + parent_blob_gas_used
            < target_blob_gas_per_block
        ):
            return 0

        # EIP-7918: Apply reserve price when execution costs dominate blob
        # costs
        current_blob_base_fee = cls.blob_gas_price_calculator()(
            excess_blob_gas=parent_excess_blob_gas
        )
        reserve_price_active = (
            blob_base_cost * parent_base_fee_per_gas
            > blob_gas_per_blob * current_blob_base_fee
        )
        if reserve_price_active:
            blob_excess_adjustment = (
                parent_blob_gas_used
                * (max_blobs_per_block - target_blobs_per_block)
                // max_blobs_per_block
            )
            return parent_excess_blob_gas + blob_excess_adjustment

        # Original EIP-4844 calculation
        return (
            parent_excess_blob_gas
            + parent_blob_gas_used
            - target_blob_gas_per_block
        )

    return fn

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

Blobs in Osaka, have a static max of 6 blobs per tx. Differs from the max per block.

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

@classmethod
def max_blobs_per_tx(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """
    Blobs in Osaka, have a static max of 6 blobs per tx. Differs from the
    max per block.
    """
    del block_number, timestamp
    return 6

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

Blob reserve price is supported in Osaka.

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

@classmethod
def blob_reserve_price_active(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """Blob reserve price is supported in Osaka."""
    del block_number, timestamp
    return True

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

Return the base cost of a blob at a given fork.

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

@classmethod
def blob_base_cost(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the base cost of a blob at a given fork."""
    del block_number, timestamp
    return 2**13  # EIP-7918 new parameter

Paris

Bases: London

Paris (Merge) fork.

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

class Paris(
    London,
    transition_tool_name="Merge",
):
    """Paris (Merge) fork."""

    @classmethod
    def header_prev_randao_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """Prev Randao is required starting from Paris."""
        del block_number, timestamp
        return True

    @classmethod
    def header_zero_difficulty_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """Zero difficulty is required starting from Paris."""
        del block_number, timestamp
        return True

    @classmethod
    def get_reward(cls, *, block_number: int = 0, timestamp: int = 0) -> int:
        """Paris updates the reward to 0."""
        del block_number, timestamp
        return 0

    @classmethod
    def engine_new_payload_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Optional[int]:
        """From Paris, payloads can be sent through the engine API."""
        del block_number, timestamp
        return 1

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

Prev Randao is required starting from Paris.

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

@classmethod
def header_prev_randao_required(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """Prev Randao is required starting from Paris."""
    del block_number, timestamp
    return True

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

Zero difficulty is required starting from Paris.

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

@classmethod
def header_zero_difficulty_required(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """Zero difficulty is required starting from Paris."""
    del block_number, timestamp
    return True

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

Paris updates the reward to 0.

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

@classmethod
def get_reward(cls, *, block_number: int = 0, timestamp: int = 0) -> int:
    """Paris updates the reward to 0."""
    del block_number, timestamp
    return 0

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

From Paris, payloads can be sent through the engine API.

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

@classmethod
def engine_new_payload_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Optional[int]:
    """From Paris, payloads can be sent through the engine API."""
    del block_number, timestamp
    return 1

Prague

Bases: Cancun

Prague fork.

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

class Prague(Cancun):
    """Prague fork."""

    # update some blob constants
    BLOB_CONSTANTS = {
        **Cancun.BLOB_CONSTANTS,  # same base constants as cancun
        "MAX_BLOBS_PER_BLOCK": 9,  # but overwrite or add these
        "TARGET_BLOBS_PER_BLOCK": 6,
        "MAX_BLOB_GAS_PER_BLOCK": 1179648,
        "TARGET_BLOB_GAS_PER_BLOCK": 786432,
        "BLOB_BASE_FEE_UPDATE_FRACTION": 5007716,
    }

    @classmethod
    def precompiles(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Address]:
        """
        At Prague, precompiles for BLS operations are added.

        BLS12_G1ADD = 0x0B
        BLS12_G1MSM = 0x0C
        BLS12_G2ADD = 0x0D
        BLS12_G2MSM = 0x0E
        BLS12_PAIRING_CHECK = 0x0F
        BLS12_MAP_FP_TO_G1 = 0x10
        BLS12_MAP_FP2_TO_G2 = 0x11
        """
        return [
            Address(11, label="BLS12_G1ADD"),
            Address(12, label="BLS12_G1MSM"),
            Address(13, label="BLS12_G2ADD"),
            Address(14, label="BLS12_G2MSM"),
            Address(15, label="BLS12_PAIRING_CHECK"),
            Address(16, label="BLS12_MAP_FP_TO_G1"),
            Address(17, label="BLS12_MAP_FP2_TO_G2"),
        ] + super(Prague, cls).precompiles(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def tx_types(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[int]:
        """At Prague, set-code type transactions are introduced."""
        return [4] + super(Prague, cls).tx_types(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def gas_costs(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> GasCosts:
        """
        On Prague, the standard token cost and the floor token costs are
        introduced due to EIP-7623.
        """
        return replace(
            super(Prague, cls).gas_costs(
                block_number=block_number, timestamp=timestamp
            ),
            G_TX_DATA_STANDARD_TOKEN_COST=4,  # https://eips.ethereum.org/EIPS/eip-7623
            G_TX_DATA_FLOOR_TOKEN_COST=10,
            G_AUTHORIZATION=25_000,
            R_AUTHORIZATION_EXISTING_AUTHORITY=12_500,
            G_PRECOMPILE_BLS_G1ADD=375,
            G_PRECOMPILE_BLS_G1MUL=12_000,
            G_PRECOMPILE_BLS_G1MAP=5_500,
            G_PRECOMPILE_BLS_G2ADD=600,
            G_PRECOMPILE_BLS_G2MUL=22_500,
            G_PRECOMPILE_BLS_G2MAP=23_800,
            G_PRECOMPILE_BLS_PAIRING_BASE=37_700,
            G_PRECOMPILE_BLS_PAIRING_PER_PAIR=32_600,
        )

    @classmethod
    def system_contracts(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Address]:
        """
        Prague introduces the system contracts for EIP-6110, EIP-7002, EIP-7251
        and EIP-2935.
        """
        return [
            Address(
                0x00000000219AB540356CBB839CBE05303D7705FA,
                label="DEPOSIT_CONTRACT_ADDRESS",
            ),
            Address(
                0x00000961EF480EB55E80D19AD83579A64C007002,
                label="WITHDRAWAL_REQUEST_PREDEPLOY_ADDRESS",
            ),
            Address(
                0x0000BBDDC7CE488642FB579F8B00F3A590007251,
                label="CONSOLIDATION_REQUEST_PREDEPLOY_ADDRESS",
            ),
            Address(
                0x0000F90827F1C53A10CB7A02335B175320002935,
                label="HISTORY_STORAGE_ADDRESS",
            ),
        ] + super(Prague, cls).system_contracts(
            block_number=block_number, timestamp=timestamp
        )

    @classmethod
    def max_request_type(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """
        At Prague, three request types are introduced, hence the max request
        type is 2.
        """
        del block_number, timestamp
        return 2

    @classmethod
    def calldata_gas_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> CalldataGasCalculator:
        """
        Return a callable that calculates the transaction gas cost for its
        calldata depending on its contents.
        """
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )

        def fn(*, data: BytesConvertible, floor: bool = False) -> int:
            tokens = 0
            for b in Bytes(data):
                if b == 0:
                    tokens += 1
                else:
                    tokens += 4
            if floor:
                return tokens * gas_costs.G_TX_DATA_FLOOR_TOKEN_COST
            return tokens * gas_costs.G_TX_DATA_STANDARD_TOKEN_COST

        return fn

    @classmethod
    def _calculate_call_gas(
        cls, opcode: OpcodeBase, gas_costs: GasCosts
    ) -> int:
        """
        At Prague, the call gas cost needs to take the authorization into
        account.
        """
        metadata = opcode.metadata

        base_cost = super(Prague, cls)._calculate_call_gas(opcode, gas_costs)

        if metadata["delegated_address"] or metadata["delegated_address_warm"]:
            if metadata["delegated_address_warm"]:
                base_cost += gas_costs.G_WARM_ACCOUNT_ACCESS
            else:
                base_cost += gas_costs.G_COLD_ACCOUNT_ACCESS

        return base_cost

    @classmethod
    def transaction_data_floor_cost_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> TransactionDataFloorCostCalculator:
        """
        On Prague, due to EIP-7623, the transaction data floor cost is
        introduced.
        """
        calldata_gas_calculator = cls.calldata_gas_calculator(
            block_number=block_number, timestamp=timestamp
        )
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )

        def fn(*, data: BytesConvertible) -> int:
            return (
                calldata_gas_calculator(data=data, floor=True)
                + gas_costs.G_TRANSACTION
            )

        return fn

    @classmethod
    def transaction_intrinsic_cost_calculator(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> TransactionIntrinsicCostCalculator:
        """
        At Prague, the transaction intrinsic cost needs to take the
        authorizations into account.
        """
        super_fn = super(Prague, cls).transaction_intrinsic_cost_calculator(
            block_number=block_number, timestamp=timestamp
        )
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )
        transaction_data_floor_cost_calculator = (
            cls.transaction_data_floor_cost_calculator(
                block_number=block_number, timestamp=timestamp
            )
        )

        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:
            intrinsic_cost: int = super_fn(
                calldata=calldata,
                contract_creation=contract_creation,
                access_list=access_list,
                return_cost_deducted_prior_execution=False,
            )
            if authorization_list_or_count is not None:
                if isinstance(authorization_list_or_count, Sized):
                    authorization_list_or_count = len(
                        authorization_list_or_count
                    )
                intrinsic_cost += (
                    authorization_list_or_count * gas_costs.G_AUTHORIZATION
                )

            if return_cost_deducted_prior_execution:
                return intrinsic_cost

            transaction_floor_data_cost = (
                transaction_data_floor_cost_calculator(data=calldata)
            )
            return max(intrinsic_cost, transaction_floor_data_cost)

        return fn

    @classmethod
    def blob_base_fee_update_fraction(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Return the blob base fee update fraction for Prague."""
        del block_number, timestamp
        return 5007716

    @classmethod
    def target_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Blobs in Prague, have a static target of 6 blobs per block."""
        del block_number, timestamp
        return 6

    @classmethod
    def max_blobs_per_block(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """Blobs in Prague, have a static max of 9 blobs per block."""
        del block_number, timestamp
        return 9

    @classmethod
    def pre_allocation_blockchain(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Mapping:
        """
        Prague requires pre-allocation of the beacon chain deposit contract for
        EIP-6110, the exits contract for EIP-7002, and the history storage
        contract for EIP-2935.
        """
        del block_number, timestamp
        new_allocation = {}

        # Add the beacon chain deposit contract
        deposit_contract_tree_depth = 32
        storage = {}
        next_hash = sha256(b"\x00" * 64).digest()
        for i in range(
            deposit_contract_tree_depth + 2,
            deposit_contract_tree_depth * 2 + 1,
        ):
            storage[i] = next_hash
            next_hash = sha256(next_hash + next_hash).digest()

        with open(
            CURRENT_FOLDER / "contracts" / "deposit_contract.bin", mode="rb"
        ) as f:
            new_allocation.update(
                {
                    0x00000000219AB540356CBB839CBE05303D7705FA: {
                        "nonce": 1,
                        "code": f.read(),
                        "storage": storage,
                    }
                }
            )

        # EIP-7002: Add the withdrawal request contract
        with open(
            CURRENT_FOLDER / "contracts" / "withdrawal_request.bin", mode="rb"
        ) as f:
            new_allocation.update(
                {
                    0x00000961EF480EB55E80D19AD83579A64C007002: {
                        "nonce": 1,
                        "code": f.read(),
                    },
                }
            )

        # EIP-7251: Add the consolidation request contract
        with open(
            CURRENT_FOLDER / "contracts" / "consolidation_request.bin",
            mode="rb",
        ) as f:
            new_allocation.update(
                {
                    0x0000BBDDC7CE488642FB579F8B00F3A590007251: {
                        "nonce": 1,
                        "code": f.read(),
                    },
                }
            )

        # EIP-2935: Add the history storage contract
        with open(
            CURRENT_FOLDER / "contracts" / "history_contract.bin", mode="rb"
        ) as f:
            new_allocation.update(
                {
                    0x0000F90827F1C53A10CB7A02335B175320002935: {
                        "nonce": 1,
                        "code": f.read(),
                    }
                }
            )

        return new_allocation | super(Prague, cls).pre_allocation_blockchain()  # type: ignore

    @classmethod
    def header_requests_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """
        Prague requires that the execution layer header contains the beacon
        chain requests hash.
        """
        del block_number, timestamp
        return True

    @classmethod
    def engine_new_payload_requests(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """
        From Prague, new payloads include the requests hash as a parameter.
        """
        del block_number, timestamp
        return True

    @classmethod
    def engine_new_payload_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Optional[int]:
        """From Prague, new payload calls must use version 4."""
        del block_number, timestamp
        return 4

    @classmethod
    def engine_forkchoice_updated_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Optional[int]:
        """
        At Prague, version number of NewPayload and ForkchoiceUpdated diverge.
        """
        del block_number, timestamp
        return 3

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

At Prague, precompiles for BLS operations are added.

BLS12_G1ADD = 0x0B BLS12_G1MSM = 0x0C BLS12_G2ADD = 0x0D BLS12_G2MSM = 0x0E BLS12_PAIRING_CHECK = 0x0F BLS12_MAP_FP_TO_G1 = 0x10 BLS12_MAP_FP2_TO_G2 = 0x11

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

@classmethod
def precompiles(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[Address]:
    """
    At Prague, precompiles for BLS operations are added.

    BLS12_G1ADD = 0x0B
    BLS12_G1MSM = 0x0C
    BLS12_G2ADD = 0x0D
    BLS12_G2MSM = 0x0E
    BLS12_PAIRING_CHECK = 0x0F
    BLS12_MAP_FP_TO_G1 = 0x10
    BLS12_MAP_FP2_TO_G2 = 0x11
    """
    return [
        Address(11, label="BLS12_G1ADD"),
        Address(12, label="BLS12_G1MSM"),
        Address(13, label="BLS12_G2ADD"),
        Address(14, label="BLS12_G2MSM"),
        Address(15, label="BLS12_PAIRING_CHECK"),
        Address(16, label="BLS12_MAP_FP_TO_G1"),
        Address(17, label="BLS12_MAP_FP2_TO_G2"),
    ] + super(Prague, cls).precompiles(
        block_number=block_number, timestamp=timestamp
    )

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

At Prague, set-code type transactions are introduced.

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

@classmethod
def tx_types(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[int]:
    """At Prague, set-code type transactions are introduced."""
    return [4] + super(Prague, cls).tx_types(
        block_number=block_number, timestamp=timestamp
    )

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

On Prague, the standard token cost and the floor token costs are introduced due to EIP-7623.

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

@classmethod
def gas_costs(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> GasCosts:
    """
    On Prague, the standard token cost and the floor token costs are
    introduced due to EIP-7623.
    """
    return replace(
        super(Prague, cls).gas_costs(
            block_number=block_number, timestamp=timestamp
        ),
        G_TX_DATA_STANDARD_TOKEN_COST=4,  # https://eips.ethereum.org/EIPS/eip-7623
        G_TX_DATA_FLOOR_TOKEN_COST=10,
        G_AUTHORIZATION=25_000,
        R_AUTHORIZATION_EXISTING_AUTHORITY=12_500,
        G_PRECOMPILE_BLS_G1ADD=375,
        G_PRECOMPILE_BLS_G1MUL=12_000,
        G_PRECOMPILE_BLS_G1MAP=5_500,
        G_PRECOMPILE_BLS_G2ADD=600,
        G_PRECOMPILE_BLS_G2MUL=22_500,
        G_PRECOMPILE_BLS_G2MAP=23_800,
        G_PRECOMPILE_BLS_PAIRING_BASE=37_700,
        G_PRECOMPILE_BLS_PAIRING_PER_PAIR=32_600,
    )

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

Prague introduces the system contracts for EIP-6110, EIP-7002, EIP-7251 and EIP-2935.

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

@classmethod
def system_contracts(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> List[Address]:
    """
    Prague introduces the system contracts for EIP-6110, EIP-7002, EIP-7251
    and EIP-2935.
    """
    return [
        Address(
            0x00000000219AB540356CBB839CBE05303D7705FA,
            label="DEPOSIT_CONTRACT_ADDRESS",
        ),
        Address(
            0x00000961EF480EB55E80D19AD83579A64C007002,
            label="WITHDRAWAL_REQUEST_PREDEPLOY_ADDRESS",
        ),
        Address(
            0x0000BBDDC7CE488642FB579F8B00F3A590007251,
            label="CONSOLIDATION_REQUEST_PREDEPLOY_ADDRESS",
        ),
        Address(
            0x0000F90827F1C53A10CB7A02335B175320002935,
            label="HISTORY_STORAGE_ADDRESS",
        ),
    ] + super(Prague, cls).system_contracts(
        block_number=block_number, timestamp=timestamp
    )

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

At Prague, three request types are introduced, hence the max request type is 2.

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

@classmethod
def max_request_type(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """
    At Prague, three request types are introduced, hence the max request
    type is 2.
    """
    del block_number, timestamp
    return 2

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

Return a 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, *, block_number: int = 0, timestamp: int = 0
) -> CalldataGasCalculator:
    """
    Return a callable that calculates the transaction gas cost for its
    calldata depending on its contents.
    """
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )

    def fn(*, data: BytesConvertible, floor: bool = False) -> int:
        tokens = 0
        for b in Bytes(data):
            if b == 0:
                tokens += 1
            else:
                tokens += 4
        if floor:
            return tokens * gas_costs.G_TX_DATA_FLOOR_TOKEN_COST
        return tokens * gas_costs.G_TX_DATA_STANDARD_TOKEN_COST

    return fn

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

On Prague, due to EIP-7623, the transaction data floor cost is introduced.

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

@classmethod
def transaction_data_floor_cost_calculator(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> TransactionDataFloorCostCalculator:
    """
    On Prague, due to EIP-7623, the transaction data floor cost is
    introduced.
    """
    calldata_gas_calculator = cls.calldata_gas_calculator(
        block_number=block_number, timestamp=timestamp
    )
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )

    def fn(*, data: BytesConvertible) -> int:
        return (
            calldata_gas_calculator(data=data, floor=True)
            + gas_costs.G_TRANSACTION
        )

    return fn

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

At Prague, the transaction intrinsic cost needs to take the authorizations into account.

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

@classmethod
def transaction_intrinsic_cost_calculator(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> TransactionIntrinsicCostCalculator:
    """
    At Prague, the transaction intrinsic cost needs to take the
    authorizations into account.
    """
    super_fn = super(Prague, cls).transaction_intrinsic_cost_calculator(
        block_number=block_number, timestamp=timestamp
    )
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )
    transaction_data_floor_cost_calculator = (
        cls.transaction_data_floor_cost_calculator(
            block_number=block_number, timestamp=timestamp
        )
    )

    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:
        intrinsic_cost: int = super_fn(
            calldata=calldata,
            contract_creation=contract_creation,
            access_list=access_list,
            return_cost_deducted_prior_execution=False,
        )
        if authorization_list_or_count is not None:
            if isinstance(authorization_list_or_count, Sized):
                authorization_list_or_count = len(
                    authorization_list_or_count
                )
            intrinsic_cost += (
                authorization_list_or_count * gas_costs.G_AUTHORIZATION
            )

        if return_cost_deducted_prior_execution:
            return intrinsic_cost

        transaction_floor_data_cost = (
            transaction_data_floor_cost_calculator(data=calldata)
        )
        return max(intrinsic_cost, transaction_floor_data_cost)

    return fn

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

Return the blob base fee update fraction for Prague.

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

@classmethod
def blob_base_fee_update_fraction(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Return the blob base fee update fraction for Prague."""
    del block_number, timestamp
    return 5007716

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

Blobs in Prague, have a static target of 6 blobs per block.

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

@classmethod
def target_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Blobs in Prague, have a static target of 6 blobs per block."""
    del block_number, timestamp
    return 6

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

Blobs in Prague, have a static max of 9 blobs per block.

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

@classmethod
def max_blobs_per_block(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """Blobs in Prague, have a static max of 9 blobs per block."""
    del block_number, timestamp
    return 9

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

Prague requires pre-allocation of the beacon chain deposit contract for EIP-6110, the exits contract for EIP-7002, and the history storage contract for EIP-2935.

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

@classmethod
def pre_allocation_blockchain(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Mapping:
    """
    Prague requires pre-allocation of the beacon chain deposit contract for
    EIP-6110, the exits contract for EIP-7002, and the history storage
    contract for EIP-2935.
    """
    del block_number, timestamp
    new_allocation = {}

    # Add the beacon chain deposit contract
    deposit_contract_tree_depth = 32
    storage = {}
    next_hash = sha256(b"\x00" * 64).digest()
    for i in range(
        deposit_contract_tree_depth + 2,
        deposit_contract_tree_depth * 2 + 1,
    ):
        storage[i] = next_hash
        next_hash = sha256(next_hash + next_hash).digest()

    with open(
        CURRENT_FOLDER / "contracts" / "deposit_contract.bin", mode="rb"
    ) as f:
        new_allocation.update(
            {
                0x00000000219AB540356CBB839CBE05303D7705FA: {
                    "nonce": 1,
                    "code": f.read(),
                    "storage": storage,
                }
            }
        )

    # EIP-7002: Add the withdrawal request contract
    with open(
        CURRENT_FOLDER / "contracts" / "withdrawal_request.bin", mode="rb"
    ) as f:
        new_allocation.update(
            {
                0x00000961EF480EB55E80D19AD83579A64C007002: {
                    "nonce": 1,
                    "code": f.read(),
                },
            }
        )

    # EIP-7251: Add the consolidation request contract
    with open(
        CURRENT_FOLDER / "contracts" / "consolidation_request.bin",
        mode="rb",
    ) as f:
        new_allocation.update(
            {
                0x0000BBDDC7CE488642FB579F8B00F3A590007251: {
                    "nonce": 1,
                    "code": f.read(),
                },
            }
        )

    # EIP-2935: Add the history storage contract
    with open(
        CURRENT_FOLDER / "contracts" / "history_contract.bin", mode="rb"
    ) as f:
        new_allocation.update(
            {
                0x0000F90827F1C53A10CB7A02335B175320002935: {
                    "nonce": 1,
                    "code": f.read(),
                }
            }
        )

    return new_allocation | super(Prague, cls).pre_allocation_blockchain()  # type: ignore

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

Prague requires that the execution layer header contains the beacon chain requests hash.

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

@classmethod
def header_requests_required(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """
    Prague requires that the execution layer header contains the beacon
    chain requests hash.
    """
    del block_number, timestamp
    return True

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

From Prague, new payloads include the requests hash as a parameter.

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

@classmethod
def engine_new_payload_requests(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """
    From Prague, new payloads include the requests hash as a parameter.
    """
    del block_number, timestamp
    return True

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

From Prague, new payload calls must use version 4.

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

@classmethod
def engine_new_payload_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Optional[int]:
    """From Prague, new payload calls must use version 4."""
    del block_number, timestamp
    return 4

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

At Prague, version number of NewPayload and ForkchoiceUpdated diverge.

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

@classmethod
def engine_forkchoice_updated_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Optional[int]:
    """
    At Prague, version number of NewPayload and ForkchoiceUpdated diverge.
    """
    del block_number, timestamp
    return 3

Shanghai

Bases: Paris

Shanghai fork.

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

class Shanghai(Paris):
    """Shanghai fork."""

    @classmethod
    def header_withdrawals_required(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> bool:
        """Withdrawals are required starting from Shanghai."""
        del block_number, timestamp
        return True

    @classmethod
    def engine_new_payload_version(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Optional[int]:
        """From Shanghai, new payload calls must use version 2."""
        del block_number, timestamp
        return 2

    @classmethod
    def max_initcode_size(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> int:
        """From Shanghai, the initcode size is now limited. See EIP-3860."""
        del block_number, timestamp
        return 0xC000

    @classmethod
    def _calculate_create_gas(
        cls, opcode: OpcodeBase, gas_costs: GasCosts
    ) -> int:
        """
        Calculate CREATE gas cost based on metadata (from Shanghai, includes
        initcode cost).
        """
        metadata = opcode.metadata

        # Get base cost from parent fork
        base_cost = super(Shanghai, cls)._calculate_create_gas(
            opcode, gas_costs
        )

        # Add initcode cost (EIP-3860)
        init_code_size = metadata["init_code_size"]
        init_code_words = (init_code_size + 31) // 32
        init_code_gas = gas_costs.G_INITCODE_WORD * init_code_words

        return base_cost + init_code_gas

    @classmethod
    def _calculate_create2_gas(
        cls, opcode: OpcodeBase, gas_costs: GasCosts
    ) -> int:
        """
        Calculate CREATE2 gas cost based on metadata (from Shanghai,
        includes initcode cost).
        """
        metadata = opcode.metadata

        # Get base cost from parent fork (includes keccak hash cost)
        base_cost = super(Shanghai, cls)._calculate_create2_gas(
            opcode, gas_costs
        )

        # Add initcode cost (EIP-3860)
        init_code_size = metadata["init_code_size"]
        init_code_words = (init_code_size + 31) // 32
        init_code_gas = gas_costs.G_INITCODE_WORD * init_code_words

        return base_cost + init_code_gas

    @classmethod
    def opcode_gas_map(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
        """Add Shanghai opcodes gas costs."""
        gas_costs = cls.gas_costs(
            block_number=block_number, timestamp=timestamp
        )
        base_map = super(Shanghai, cls).opcode_gas_map(
            block_number=block_number, timestamp=timestamp
        )
        return {
            **base_map,
            Opcodes.PUSH0: gas_costs.G_BASE,
        }

    @classmethod
    def valid_opcodes(
        cls, *, block_number: int = 0, timestamp: int = 0
    ) -> List[Opcodes]:
        """Return list of Opcodes that are valid to work on this fork."""
        del block_number, timestamp
        return [Opcodes.PUSH0] + super(Shanghai, cls).valid_opcodes()

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

Withdrawals are required starting from Shanghai.

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

@classmethod
def header_withdrawals_required(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> bool:
    """Withdrawals are required starting from Shanghai."""
    del block_number, timestamp
    return True

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

From Shanghai, new payload calls must use version 2.

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

@classmethod
def engine_new_payload_version(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Optional[int]:
    """From Shanghai, new payload calls must use version 2."""
    del block_number, timestamp
    return 2

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

From Shanghai, the initcode size is now limited. See EIP-3860.

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

@classmethod
def max_initcode_size(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> int:
    """From Shanghai, the initcode size is now limited. See EIP-3860."""
    del block_number, timestamp
    return 0xC000

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

Add Shanghai opcodes gas costs.

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

@classmethod
def opcode_gas_map(
    cls, *, block_number: int = 0, timestamp: int = 0
) -> Dict[OpcodeBase, int | Callable[[OpcodeBase], int]]:
    """Add Shanghai opcodes gas costs."""
    gas_costs = cls.gas_costs(
        block_number=block_number, timestamp=timestamp
    )
    base_map = super(Shanghai, cls).opcode_gas_map(
        block_number=block_number, timestamp=timestamp
    )
    return {
        **base_map,
        Opcodes.PUSH0: gas_costs.G_BASE,
    }

valid_opcodes(*, block_number=0, timestamp=0) 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, *, block_number: int = 0, timestamp: int = 0
) -> List[Opcodes]:
    """Return list of Opcodes that are valid to work on this fork."""
    del block_number, timestamp
    return [Opcodes.PUSH0] + super(Shanghai, cls).valid_opcodes()

SpuriousDragon

Bases: TangerineWhistle

SpuriousDragon fork.

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

class SpuriousDragon(TangerineWhistle, ignore=True):
    """SpuriousDragon fork."""

    @classmethod
    def _calculate_call_gas(
        cls, opcode: OpcodeBase, gas_costs: GasCosts
    ) -> int:
        """
        At Spurious Dragon, the call gas cost needs to take the value transfer
        and account new into account.
        """
        base_cost = super(SpuriousDragon, cls)._calculate_call_gas(
            opcode, gas_costs
        )

        # Additional costs for value transfer, does not apply to STATICCALL
        metadata = opcode.metadata
        if "value_transfer" in metadata:
            if metadata["value_transfer"]:
                base_cost += gas_costs.G_CALL_VALUE
                if metadata["account_new"]:
                    base_cost += gas_costs.G_NEW_ACCOUNT
            elif metadata["account_new"]:
                raise ValueError("Account new requires value transfer")

        return base_cost

    @classmethod
    def supports_protected_txs(cls) -> bool:
        """
        At Genesis, supports EIP-155 protected transactions.
        """
        return True

supports_protected_txs() classmethod

At Genesis, supports EIP-155 protected transactions.

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

@classmethod
def supports_protected_txs(cls) -> bool:
    """
    At Genesis, supports EIP-155 protected transactions.
    """
    return True

TangerineWhistle

Bases: DAOFork

TangerineWhistle fork (EIP-150).

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

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

    pass

BerlinToLondonAt5

Bases: Berlin

Berlin to London transition at Block 5.

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

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

    pass

BPO1ToBPO2AtTime15k

Bases: BPO1

BPO1 to BPO2 transition at Timestamp 15k.

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

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

    pass

BPO2ToAmsterdamAtTime15k

Bases: BPO2

BPO2 to Amsterdam transition at Timestamp 15k.

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

@transition_fork(to_fork=Amsterdam, at_timestamp=15_000)
class BPO2ToAmsterdamAtTime15k(BPO2):
    """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: BPO2

BPO2 to BPO3 transition at Timestamp 15k.

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

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

    pass

BPO3ToBPO4AtTime15k

Bases: BPO3

BPO3 to BPO4 transition at Timestamp 15k.

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

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

    pass

CancunToPragueAtTime15k

Bases: Cancun

Cancun to Prague transition at Timestamp 15k.

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

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

    pass

OsakaToBPO1AtTime15k

Bases: Osaka

Osaka to BPO1 transition at Timestamp 15k.

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

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

    pass

ParisToShanghaiAtTime15k

Bases: Paris

Paris to Shanghai transition at Timestamp 15k.

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

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

    pass

PragueToOsakaAtTime15k

Bases: Prague

Prague to Osaka transition at Timestamp 15k.

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

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

    pass

ShanghaiToCancunAtTime15k

Bases: Shanghai

Shanghai to Cancun transition at Timestamp 15k.

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

@transition_fork(to_fork=Cancun, at_timestamp=15_000)
class ShanghaiToCancunAtTime15k(Shanghai):
    """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."""

    G_JUMPDEST: int
    G_BASE: int
    G_VERY_LOW: int
    G_LOW: int
    G_MID: int
    G_HIGH: int
    G_WARM_ACCOUNT_ACCESS: int
    G_COLD_ACCOUNT_ACCESS: int
    G_ACCESS_LIST_ADDRESS: int
    G_ACCESS_LIST_STORAGE: int
    G_WARM_SLOAD: int
    G_COLD_SLOAD: int
    G_STORAGE_SET: int
    G_STORAGE_UPDATE: int
    G_STORAGE_RESET: int

    R_STORAGE_CLEAR: int

    G_SELF_DESTRUCT: int
    G_CREATE: int

    G_CODE_DEPOSIT_BYTE: int
    G_INITCODE_WORD: int

    G_CALL_VALUE: int
    G_CALL_STIPEND: int
    G_NEW_ACCOUNT: int

    G_EXP: int
    G_EXP_BYTE: int

    G_MEMORY: int

    G_TX_DATA_ZERO: int
    G_TX_DATA_NON_ZERO: int
    G_TX_DATA_STANDARD_TOKEN_COST: int
    G_TX_DATA_FLOOR_TOKEN_COST: int

    G_TRANSACTION: int
    G_TRANSACTION_CREATE: int

    G_LOG: int
    G_LOG_DATA: int
    G_LOG_TOPIC: int

    G_KECCAK_256: int
    G_KECCAK_256_WORD: int

    G_COPY: int
    G_BLOCKHASH: int

    G_AUTHORIZATION: int

    # Precompiled contract gas constants

    G_PRECOMPILE_ECRECOVER: int
    G_PRECOMPILE_SHA256_BASE: int
    G_PRECOMPILE_SHA256_WORD: int
    G_PRECOMPILE_RIPEMD160_BASE: int
    G_PRECOMPILE_RIPEMD160_WORD: int
    G_PRECOMPILE_IDENTITY_BASE: int
    G_PRECOMPILE_IDENTITY_WORD: int

    G_PRECOMPILE_ECADD: int
    G_PRECOMPILE_ECMUL: int
    G_PRECOMPILE_ECPAIRING_BASE: int
    G_PRECOMPILE_ECPAIRING_PER_POINT: int

    G_PRECOMPILE_BLAKE2F_BASE: int
    G_PRECOMPILE_BLAKE2F_PER_ROUND: int

    G_PRECOMPILE_POINT_EVALUATION: int

    G_PRECOMPILE_BLS_G1ADD: int
    G_PRECOMPILE_BLS_G1MUL: int
    G_PRECOMPILE_BLS_G1MAP: int
    G_PRECOMPILE_BLS_G2ADD: int
    G_PRECOMPILE_BLS_G2MUL: int
    G_PRECOMPILE_BLS_G2MAP: int
    G_PRECOMPILE_BLS_PAIRING_BASE: int
    G_PRECOMPILE_BLS_PAIRING_PER_PAIR: int

    G_PRECOMPILE_P256VERIFY: int

    # Refund constants

    R_AUTHORIZATION_EXISTING_AUTHORITY: int

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 = fork_until

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

    while prev_fork != BaseFork and prev_fork != fork_from:
        forks.insert(0, prev_fork)

        prev_fork = get_parent_fork(prev_fork)

    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]]:
    """
    Process sets derived from `--fork`, `--until` and `--from` to return an
    unified fork set.
    """
    selected_fork_set = 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
        )
    if transition_forks:
        for fork in list(selected_fork_set):
            transition_fork_set = transition_fork_to(fork)
            selected_fork_set |= transition_fork_set
    return selected_fork_set

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

    return transition_forks