ethereum.forks.amsterdam.vm
Ethereum Virtual Machine (EVM).
.. contents:: Table of Contents :backlinks: none :local:
Introduction
The abstract computer which runs the code stored in an
.fork_types.Account.
__all__¶
| 39 | __all__ = ("Environment", "Evm") |
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TRANSFER_TOPIC¶
| 40 | TRANSFER_TOPIC = keccak256(b"Transfer(address,address,uint256)") |
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SYSTEM_ADDRESS¶
| 41 | SYSTEM_ADDRESS = Address( |
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| 42 | bytes.fromhex("fffffffffffffffffffffffffffffffffffffffe") |
| 43 | ) |
CALL_SUCCESS¶
| 44 | CALL_SUCCESS = U256(1) |
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BlockEnvironment ¶
Items external to the virtual machine itself, provided by the environment.
| 47 | @final |
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| 48 | @dataclass |
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class BlockEnvironment:
chain_id¶
| 54 | chain_id: U64 |
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state¶
| 55 | state: BlockState |
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block_gas_limit¶
| 56 | block_gas_limit: Uint |
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block_hashes¶
| 57 | block_hashes: List[Hash32] |
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coinbase¶
| 58 | coinbase: Address |
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number¶
| 59 | number: Uint |
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base_fee_per_gas¶
| 60 | base_fee_per_gas: Uint |
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time¶
| 61 | time: U256 |
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prev_randao¶
| 62 | prev_randao: Bytes32 |
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excess_blob_gas¶
| 63 | excess_blob_gas: U64 |
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parent_beacon_block_root¶
| 64 | parent_beacon_block_root: Hash32 |
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block_access_list_builder¶
| 65 | block_access_list_builder: BlockAccessListBuilder |
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slot_number¶
| 66 | slot_number: U64 |
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BlockOutput ¶
Output from applying the block body to the present state.
Contains the following:
block_gas_used : ExecutionGas
Execution gas used for executing all transactions. EIP-8037
names this counter block_execution_gas_used.
block_state_gas_used : StateGas
State gas used for executing all transactions.
cumulative_gas_used : ethereum.base_types.Uint
Cumulative gas paid by users (post-refund, post-floor).
transactions_trie : ethereum.fork_types.Root
Trie of all the transactions in the block.
receipts_trie : ethereum.fork_types.Root
Trie root of all the receipts in the block.
receipt_keys :
Keys of all the receipts in the block.
block_logs : Bloom
Logs bloom of all the logs included in all the transactions of the
block.
withdrawals_trie : ethereum.fork_types.Root
Trie root of all the withdrawals in the block.
blob_gas_used : ethereum.base_types.U64
Total blob gas used in the block.
requests : Bytes
Hash of all the requests in the block.
block_access_list: BlockAccessList
The block access list for the block.
| 69 | @final |
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| 70 | @dataclass |
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class BlockOutput:
block_gas_used¶
| 103 | block_gas_used: ExecutionGas = ExecutionGas(Uint(0)) |
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block_state_gas_used¶
| 104 | block_state_gas_used: StateGas = StateGas(Uint(0)) |
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cumulative_gas_used¶
| 105 | cumulative_gas_used: Uint = Uint(0) |
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transactions_trie¶
| 106 | transactions_trie: Trie[Bytes, Optional[Bytes | LegacyTransaction]] = ( |
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| 107 | field(default_factory=lambda: Trie(secured=False, default=None)) |
| 108 | ) |
receipts_trie¶
| 109 | receipts_trie: Trie[Bytes, Optional[Bytes | Receipt]] = field( |
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| 110 | default_factory=lambda: Trie(secured=False, default=None) |
| 111 | ) |
receipt_keys¶
| 112 | receipt_keys: Tuple[Bytes, ...] = field(default_factory=tuple) |
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block_logs¶
| 113 | block_logs: Tuple[Log, ...] = field(default_factory=tuple) |
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withdrawals_trie¶
| 114 | withdrawals_trie: Trie[Bytes, Optional[Bytes | Withdrawal]] = field( |
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| 115 | default_factory=lambda: Trie(secured=False, default=None) |
| 116 | ) |
blob_gas_used¶
| 117 | blob_gas_used: U64 = U64(0) |
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requests¶
| 118 | requests: List[Bytes] = field(default_factory=list) |
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block_access_list¶
| 119 | block_access_list: BlockAccessList = field(default_factory=list) |
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TransactionEnvironment ¶
Items that are used while processing a transaction.
| 122 | @final |
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| 123 | @dataclass |
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class TransactionEnvironment:
origin¶
| 129 | origin: Address |
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recipient¶
| 131 | recipient: Address |
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is_create¶
| 132 | is_create: bool |
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data¶
| 133 | data: Bytes |
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value¶
| 134 | value: U256 |
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gas_limit¶
| 135 | gas_limit: Uint |
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effective_gas_price¶
| 136 | effective_gas_price: Uint |
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execution_gas_grant¶
| 137 | execution_gas_grant: ExecutionGas |
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state_gas_reservoir¶
| 138 | state_gas_reservoir: StateGas |
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calldata_floor¶
| 139 | calldata_floor: Uint |
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access_list_addresses¶
| 140 | access_list_addresses: Set[Address] |
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access_list_storage_keys¶
| 141 | access_list_storage_keys: Set[Tuple[Address, Bytes32]] |
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accounts_with_paid_writes¶
| 142 | accounts_with_paid_writes: Set[Address] |
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state¶
| 143 | state: TransactionState |
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blob_versioned_hashes¶
| 144 | blob_versioned_hashes: Tuple[VersionedHash, ...] |
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index_in_block¶
| 146 | index_in_block: Optional[Uint] |
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tx_hash¶
| 147 | tx_hash: Optional[Hash32] |
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Evm ¶
A single call frame: its parameters, gas meter, machine state, and accrued effects.
A call spawns a child frame and each top-level call is a frame at depth zero, so one dataclass describes them all.
| 150 | @final |
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| 151 | @dataclass |
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class Evm:
pc¶
| 161 | pc: Uint |
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stack¶
| 162 | stack: List[U256] |
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memory¶
| 163 | memory: bytearray |
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code¶
| 165 | code: Bytes |
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gas_meter¶
| 166 | gas_meter: GasMeter |
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valid_jump_destinations¶
| 167 | valid_jump_destinations: Set[Uint] |
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logs¶
| 168 | logs: Tuple[Log, ...] |
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running¶
| 169 | running: bool |
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block_env¶
| 172 | block_env: BlockEnvironment |
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tx_env¶
| 173 | tx_env: TransactionEnvironment |
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caller¶
| 174 | caller: Address |
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current_target¶
| 175 | current_target: Address |
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value¶
| 176 | value: U256 |
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call_data¶
| 177 | call_data: Bytes |
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code_address¶
| 178 | code_address: Optional[Address] |
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depth¶
| 179 | depth: Uint |
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should_transfer_value¶
| 180 | should_transfer_value: bool |
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is_static¶
| 181 | is_static: bool |
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disable_precompiles¶
| 182 | disable_precompiles: bool |
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parent_evm¶
| 183 | parent_evm: Optional["Evm"] |
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output¶
| 185 | output: Bytes |
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accounts_to_delete¶
| 186 | accounts_to_delete: Set[Address] |
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return_data¶
| 187 | return_data: Bytes |
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error¶
| 188 | error: Optional[EthereumException] |
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accessed_addresses¶
| 189 | accessed_addresses: Set[Address] |
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accessed_storage_keys¶
| 190 | accessed_storage_keys: Set[Tuple[Address, Bytes32]] |
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incorporate_child ¶
Incorporate the state of a returning child_evm into the parent
evm.
Gas flows back to the parent regardless of the child's fate. A failed child settles its own meter before returning -- its state gas rolled back to the baseline, its spill refilled, and its refunds discarded -- so absorbing the meter unconditionally reclaims exactly the gas the child gives back. Everything else the child accumulated -- logs, scheduled self-destructs, refunds, and warmed access sets -- survives only on success, dying with a failed child's reverted state.
Parameters
evm :
The parent EVM.
child_evm :
The child evm to incorporate.
def incorporate_child(evm: Evm, child_evm: Evm) -> None:
| 194 | <snip> |
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| 217 | child_meter = child_evm.gas_meter |
| 218 | # Only the top frame commits state gas; a child never carries any. |
| 219 | assert child_meter.state_gas_committed_spill == Uint(0) |
| 220 | |
| 221 | if child_evm.error: |
| 222 | # A failed child arrives settled: rolled back to its baseline, |
| 223 | # spill refilled, refunds discarded. |
| 224 | assert child_meter.state_gas_spilled == Uint(0) |
| 225 | assert child_meter.refund_counter == 0 |
| 226 | assert child_meter.state_gas_left == child_meter.state_gas_baseline |
| 227 | |
| 228 | # Gas returns to the parent regardless of the child's fate. |
| 229 | # Note that upon failure, the child already arrives settled. |
| 230 | gas_meter = evm.gas_meter |
| 231 | gas_meter.gas_left += child_meter.gas_left |
| 232 | gas_meter.state_gas_left += child_meter.state_gas_left |
| 233 | gas_meter.state_gas_spilled += child_meter.state_gas_spilled |
| 234 | gas_meter.refund_counter += child_meter.refund_counter |
| 235 | |
| 236 | # Everything else survives only on success. |
| 237 | if not child_evm.error: |
| 238 | evm.logs += child_evm.logs |
| 239 | evm.accounts_to_delete.update(child_evm.accounts_to_delete) |
| 240 | evm.accessed_addresses.update(child_evm.accessed_addresses) |
| 241 | evm.accessed_storage_keys.update(child_evm.accessed_storage_keys) |
emit_transfer_log ¶
Emit a LOG3 for all ETH transfers satisfying EIP-7708.
Parameters
evm : The state of the ethereum virtual machine sender : The account address sending the transfer recipient : The account address receiving the transfer transfer_amount : The amount of ETH transacted
def emit_transfer_log(evm: Evm, sender: Address, recipient: Address, transfer_amount: U256) -> None:
| 250 | <snip> |
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| 265 | if transfer_amount == 0: |
| 266 | return |
| 267 | |
| 268 | padded_sender = left_pad_zero_bytes(sender, 32) |
| 269 | padded_recipient = left_pad_zero_bytes(recipient, 32) |
| 270 | log_entry = Log( |
| 271 | address=SYSTEM_ADDRESS, |
| 272 | topics=( |
| 273 | TRANSFER_TOPIC, |
| 274 | Hash32(padded_sender), |
| 275 | Hash32(padded_recipient), |
| 276 | ), |
| 277 | data=transfer_amount.to_be_bytes32(), |
| 278 | ) |
| 279 | |
| 280 | evm.logs = evm.logs + (log_entry,) |