ethereum.forks.frontier.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__
| 30 | __all__ = ("Environment", "Evm", "Message") |
|---|
BlockEnvironment
Items external to the virtual machine itself, provided by the environment.
| 33 | @dataclass |
|---|
class BlockEnvironment:
chain_id
| 39 | chain_id: U64 |
|---|
state
| 40 | state: State |
|---|
block_gas_limit
| 41 | block_gas_limit: Uint |
|---|
block_hashes
| 42 | block_hashes: List[Hash32] |
|---|
coinbase
| 43 | coinbase: Address |
|---|
number
| 44 | number: Uint |
|---|
time
| 45 | time: U256 |
|---|
difficulty
| 46 | difficulty: Uint |
|---|
BlockOutput
Output from applying the block body to the present state.
Contains the following:
block_gas_used : ethereum.base_types.Uint
Gas used for executing all transactions.
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 :
Key of all the receipts in the block.
block_logs : Bloom
Logs bloom of all the logs included in all the transactions of the
block.
| 49 | @dataclass |
|---|
class BlockOutput:
block_gas_used
| 69 | block_gas_used: Uint = Uint(0) |
|---|
transactions_trie
| 70 | transactions_trie: Trie[Bytes, Optional[Transaction]] = field( |
|---|---|
| 71 | default_factory=lambda: Trie(secured=False, default=None) |
| 72 | ) |
receipts_trie
| 73 | receipts_trie: Trie[Bytes, Optional[Receipt]] = field( |
|---|---|
| 74 | default_factory=lambda: Trie(secured=False, default=None) |
| 75 | ) |
receipt_keys
| 76 | receipt_keys: Tuple[Bytes, ...] = field(default_factory=tuple) |
|---|
block_logs
| 77 | block_logs: Tuple[Log, ...] = field(default_factory=tuple) |
|---|
TransactionEnvironment
Items that are used by contract creation or message call.
| 80 | @dataclass |
|---|
class TransactionEnvironment:
origin
| 86 | origin: Address |
|---|
gas_price
| 87 | gas_price: Uint |
|---|
gas
| 88 | gas: Uint |
|---|
index_in_block
| 89 | index_in_block: Uint |
|---|
tx_hash
| 90 | tx_hash: Optional[Hash32] |
|---|
Message
Items that are used by contract creation or message call.
| 93 | @dataclass |
|---|
class Message:
block_env
| 99 | block_env: BlockEnvironment |
|---|
tx_env
| 100 | tx_env: TransactionEnvironment |
|---|
caller
| 101 | caller: Address |
|---|
target
| 102 | target: Bytes0 | Address |
|---|
current_target
| 103 | current_target: Address |
|---|
gas
| 104 | gas: Uint |
|---|
value
| 105 | value: U256 |
|---|
data
| 106 | data: Bytes |
|---|
code_address
| 107 | code_address: Optional[Address] |
|---|
code
| 108 | code: Bytes |
|---|
depth
| 109 | depth: Uint |
|---|
parent_evm
| 110 | parent_evm: Optional["Evm"] |
|---|
Evm
The internal state of the virtual machine.
| 113 | @dataclass |
|---|
class Evm:
pc
| 117 | pc: Uint |
|---|
stack
| 118 | stack: List[U256] |
|---|
memory
| 119 | memory: bytearray |
|---|
code
| 120 | code: Bytes |
|---|
gas_left
| 121 | gas_left: Uint |
|---|
valid_jump_destinations
| 122 | valid_jump_destinations: Set[Uint] |
|---|
logs
| 123 | logs: Tuple[Log, ...] |
|---|
refund_counter
| 124 | refund_counter: int |
|---|
running
| 125 | running: bool |
|---|
message
| 126 | message: Message |
|---|
output
| 127 | output: Bytes |
|---|
accounts_to_delete
| 128 | accounts_to_delete: Set[Address] |
|---|
error
| 129 | error: Optional[EthereumException] |
|---|
incorporate_child_on_success
Incorporate the state of a successful child_evm into the parent evm.
Parameters
evm :
The parent EVM.
child_evm :
The child evm to incorporate.
def incorporate_child_on_success(evm: Evm, child_evm: Evm) -> None:
| 133 | """ |
|---|---|
| 134 | Incorporate the state of a successful `child_evm` into the parent `evm`. |
| 135 | |
| 136 | Parameters |
| 137 | ---------- |
| 138 | evm : |
| 139 | The parent `EVM`. |
| 140 | child_evm : |
| 141 | The child evm to incorporate. |
| 142 | |
| 143 | """ |
| 144 | evm.gas_left += child_evm.gas_left |
| 145 | evm.logs += child_evm.logs |
| 146 | evm.refund_counter += child_evm.refund_counter |
| 147 | evm.accounts_to_delete.update(child_evm.accounts_to_delete) |
incorporate_child_on_error
Incorporate the state of an unsuccessful child_evm into the parent evm.
Parameters
evm :
The parent EVM.
child_evm :
The child evm to incorporate.
def incorporate_child_on_error(evm: Evm, child_evm: Evm) -> None:
| 151 | """ |
|---|---|
| 152 | Incorporate the state of an unsuccessful `child_evm` into the parent `evm`. |
| 153 | |
| 154 | Parameters |
| 155 | ---------- |
| 156 | evm : |
| 157 | The parent `EVM`. |
| 158 | child_evm : |
| 159 | The child evm to incorporate. |
| 160 | |
| 161 | """ |
| 162 | evm.gas_left += child_evm.gas_left |