ethereum.forks.spurious_dragon.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__
| 31 | __all__ = ("Environment", "Evm", "Message") |
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BlockEnvironment
Items external to the virtual machine itself, provided by the environment.
| 34 | @dataclass |
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class BlockEnvironment:
chain_id
| 40 | chain_id: U64 |
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state
| 41 | state: State |
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block_gas_limit
| 42 | block_gas_limit: Uint |
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block_hashes
| 43 | block_hashes: List[Hash32] |
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coinbase
| 44 | coinbase: Address |
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number
| 45 | number: Uint |
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time
| 46 | time: U256 |
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difficulty
| 47 | difficulty: Uint |
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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.
| 50 | @dataclass |
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class BlockOutput:
block_gas_used
| 70 | block_gas_used: Uint = Uint(0) |
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transactions_trie
| 71 | transactions_trie: Trie[Bytes, Optional[Transaction]] = field( |
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| 72 | default_factory=lambda: Trie(secured=False, default=None) |
| 73 | ) |
receipts_trie
| 74 | receipts_trie: Trie[Bytes, Optional[Receipt]] = field( |
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| 75 | default_factory=lambda: Trie(secured=False, default=None) |
| 76 | ) |
receipt_keys
| 77 | receipt_keys: Tuple[Bytes, ...] = field(default_factory=tuple) |
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block_logs
| 78 | block_logs: Tuple[Log, ...] = field(default_factory=tuple) |
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TransactionEnvironment
Items that are used by contract creation or message call.
| 81 | @dataclass |
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class TransactionEnvironment:
origin
| 87 | origin: Address |
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gas_price
| 88 | gas_price: Uint |
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gas
| 89 | gas: Uint |
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index_in_block
| 90 | index_in_block: Uint |
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tx_hash
| 91 | tx_hash: Optional[Hash32] |
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Message
Items that are used by contract creation or message call.
| 94 | @dataclass |
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class Message:
block_env
| 100 | block_env: BlockEnvironment |
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tx_env
| 101 | tx_env: TransactionEnvironment |
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caller
| 102 | caller: Address |
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target
| 103 | target: Bytes0 | Address |
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current_target
| 104 | current_target: Address |
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gas
| 105 | gas: Uint |
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value
| 106 | value: U256 |
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data
| 107 | data: Bytes |
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code_address
| 108 | code_address: Optional[Address] |
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code
| 109 | code: Bytes |
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depth
| 110 | depth: Uint |
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should_transfer_value
| 111 | should_transfer_value: bool |
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parent_evm
| 112 | parent_evm: Optional["Evm"] |
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Evm
The internal state of the virtual machine.
| 115 | @dataclass |
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class Evm:
pc
| 119 | pc: Uint |
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stack
| 120 | stack: List[U256] |
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memory
| 121 | memory: bytearray |
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code
| 122 | code: Bytes |
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gas_left
| 123 | gas_left: Uint |
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valid_jump_destinations
| 124 | valid_jump_destinations: Set[Uint] |
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logs
| 125 | logs: Tuple[Log, ...] |
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refund_counter
| 126 | refund_counter: int |
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running
| 127 | running: bool |
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message
| 128 | message: Message |
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output
| 129 | output: Bytes |
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accounts_to_delete
| 130 | accounts_to_delete: Set[Address] |
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touched_accounts
| 131 | touched_accounts: Set[Address] |
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error
| 132 | error: Optional[EthereumException] |
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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:
| 136 | """ |
|---|---|
| 137 | Incorporate the state of a successful `child_evm` into the parent `evm`. |
| 138 | |
| 139 | Parameters |
| 140 | ---------- |
| 141 | evm : |
| 142 | The parent `EVM`. |
| 143 | child_evm : |
| 144 | The child evm to incorporate. |
| 145 | |
| 146 | """ |
| 147 | evm.gas_left += child_evm.gas_left |
| 148 | evm.logs += child_evm.logs |
| 149 | evm.refund_counter += child_evm.refund_counter |
| 150 | evm.accounts_to_delete.update(child_evm.accounts_to_delete) |
| 151 | evm.touched_accounts.update(child_evm.touched_accounts) |
| 152 | if account_exists_and_is_empty( |
| 153 | evm.message.block_env.state, child_evm.message.current_target |
| 154 | ): |
| 155 | evm.touched_accounts.add(child_evm.message.current_target) |
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:
| 159 | """ |
|---|---|
| 160 | Incorporate the state of an unsuccessful `child_evm` into the parent `evm`. |
| 161 | |
| 162 | Parameters |
| 163 | ---------- |
| 164 | evm : |
| 165 | The parent `EVM`. |
| 166 | child_evm : |
| 167 | The child evm to incorporate. |
| 168 | |
| 169 | """ |
| 170 | # In block 2675119, the empty account at 0x3 (the RIPEMD160 precompile) was |
| 171 | # cleared despite running out of gas. This is an obscure edge case that can |
| 172 | # only happen to a precompile. |
| 173 | # According to the general rules governing clearing of empty accounts, the |
| 174 | # touch should have been reverted. Due to client bugs, this event went |
| 175 | # unnoticed and 0x3 has been exempted from the rule that touches are |
| 176 | # reverted in order to preserve this historical behaviour. |
| 177 | if RIPEMD160_ADDRESS in child_evm.touched_accounts: |
| 178 | evm.touched_accounts.add(RIPEMD160_ADDRESS) |
| 179 | if child_evm.message.current_target == RIPEMD160_ADDRESS: |
| 180 | if account_exists_and_is_empty( |
| 181 | evm.message.block_env.state, child_evm.message.current_target |
| 182 | ): |
| 183 | evm.touched_accounts.add(RIPEMD160_ADDRESS) |
| 184 | evm.gas_left += child_evm.gas_left |