ethereum.berlin.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__
29 | __all__ = ("Environment", "Evm", "Message") |
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Environment
Items external to the virtual machine itself, provided by the environment.
32 | @dataclass |
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class Environment:
caller
38 | caller: Address |
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block_hashes
39 | block_hashes: List[Hash32] |
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origin
40 | origin: Address |
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coinbase
41 | coinbase: Address |
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number
42 | number: Uint |
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gas_limit
43 | gas_limit: Uint |
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gas_price
44 | gas_price: Uint |
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time
45 | time: U256 |
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difficulty
46 | difficulty: Uint |
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state
47 | state: State |
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chain_id
48 | chain_id: U64 |
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traces
49 | traces: List[dict] |
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Message
Items that are used by contract creation or message call.
52 | @dataclass |
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class Message:
caller
58 | caller: Address |
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target
59 | target: Union[Bytes0, Address] |
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current_target
60 | current_target: Address |
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gas
61 | gas: Uint |
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value
62 | value: U256 |
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data
63 | data: Bytes |
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code_address
64 | code_address: Optional[Address] |
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code
65 | code: Bytes |
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depth
66 | depth: Uint |
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should_transfer_value
67 | should_transfer_value: bool |
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is_static
68 | is_static: bool |
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accessed_addresses
69 | accessed_addresses: Set[Address] |
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accessed_storage_keys
70 | accessed_storage_keys: Set[Tuple[Address, Bytes32]] |
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parent_evm
71 | parent_evm: Optional["Evm"] |
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Evm
The internal state of the virtual machine.
74 | @dataclass |
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class Evm:
pc
78 | pc: Uint |
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stack
79 | stack: List[U256] |
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memory
80 | memory: bytearray |
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code
81 | code: Bytes |
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gas_left
82 | gas_left: Uint |
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env
83 | env: Environment |
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valid_jump_destinations
84 | valid_jump_destinations: Set[Uint] |
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logs
85 | logs: Tuple[Log, ...] |
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refund_counter
86 | refund_counter: int |
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running
87 | running: bool |
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message
88 | message: Message |
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output
89 | output: Bytes |
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accounts_to_delete
90 | accounts_to_delete: Set[Address] |
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touched_accounts
91 | touched_accounts: Set[Address] |
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return_data
92 | return_data: Bytes |
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error
93 | error: Optional[Exception] |
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accessed_addresses
94 | accessed_addresses: Set[Address] |
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accessed_storage_keys
95 | accessed_storage_keys: Set[Tuple[Address, Bytes32]] |
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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:
99 | """ |
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100 | Incorporate the state of a successful `child_evm` into the parent `evm`. |
101 |
|
102 | Parameters |
103 | ---------- |
104 | evm : |
105 | The parent `EVM`. |
106 | child_evm : |
107 | The child evm to incorporate. |
108 | """ |
109 | evm.gas_left += child_evm.gas_left |
110 | evm.logs += child_evm.logs |
111 | evm.refund_counter += child_evm.refund_counter |
112 | evm.accounts_to_delete.update(child_evm.accounts_to_delete) |
113 | evm.touched_accounts.update(child_evm.touched_accounts) |
114 | if account_exists_and_is_empty( |
115 | evm.env.state, child_evm.message.current_target |
116 | ): |
117 | evm.touched_accounts.add(child_evm.message.current_target) |
118 | evm.accessed_addresses.update(child_evm.accessed_addresses) |
119 | evm.accessed_storage_keys.update(child_evm.accessed_storage_keys) |
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:
123 | """ |
---|---|
124 | Incorporate the state of an unsuccessful `child_evm` into the parent `evm`. |
125 |
|
126 | Parameters |
127 | ---------- |
128 | evm : |
129 | The parent `EVM`. |
130 | child_evm : |
131 | The child evm to incorporate. |
132 | """ |
133 | # In block 2675119, the empty account at 0x3 (the RIPEMD160 precompile) was |
134 | # cleared despite running out of gas. This is an obscure edge case that can |
135 | # only happen to a precompile. |
136 | # According to the general rules governing clearing of empty accounts, the |
137 | # touch should have been reverted. Due to client bugs, this event went |
138 | # unnoticed and 0x3 has been exempted from the rule that touches are |
139 | # reverted in order to preserve this historical behaviour. |
140 | if RIPEMD160_ADDRESS in child_evm.touched_accounts: |
141 | evm.touched_accounts.add(RIPEMD160_ADDRESS) |
142 | if child_evm.message.current_target == RIPEMD160_ADDRESS: |
143 | if account_exists_and_is_empty( |
144 | evm.env.state, child_evm.message.current_target |
145 | ): |
146 | evm.touched_accounts.add(RIPEMD160_ADDRESS) |
147 | evm.gas_left += child_evm.gas_left |