reth_evm/system_calls/
eip2935.rs

1//! [EIP-2935](https://eips.ethereum.org/EIPS/eip-2935) system call implementation.
2
3use alloc::{boxed::Box, string::ToString};
4use alloy_eips::eip2935::HISTORY_STORAGE_ADDRESS;
5
6use crate::ConfigureEvm;
7use alloy_primitives::B256;
8use reth_chainspec::EthereumHardforks;
9use reth_execution_errors::{BlockExecutionError, BlockValidationError};
10use revm::{interpreter::Host, Database, Evm};
11use revm_primitives::ResultAndState;
12
13/// Applies the pre-block call to the [EIP-2935] blockhashes contract, using the given block,
14/// chain specification, and EVM.
15///
16/// If Prague is not activated, or the block is the genesis block, then this is a no-op, and no
17/// state changes are made.
18///
19/// Note: this does not commit the state changes to the database, it only transact the call.
20///
21/// Returns `None` if Prague is not active or the block is the genesis block, otherwise returns the
22/// result of the call.
23///
24/// [EIP-2935]: https://eips.ethereum.org/EIPS/eip-2935
25#[inline]
26pub(crate) fn transact_blockhashes_contract_call<EvmConfig, EXT, DB>(
27    evm_config: &EvmConfig,
28    chain_spec: impl EthereumHardforks,
29    block_timestamp: u64,
30    block_number: u64,
31    parent_block_hash: B256,
32    evm: &mut Evm<'_, EXT, DB>,
33) -> Result<Option<ResultAndState>, BlockExecutionError>
34where
35    DB: Database,
36    DB::Error: core::fmt::Display,
37    EvmConfig: ConfigureEvm,
38{
39    if !chain_spec.is_prague_active_at_timestamp(block_timestamp) {
40        return Ok(None)
41    }
42
43    // if the block number is zero (genesis block) then no system transaction may occur as per
44    // EIP-2935
45    if block_number == 0 {
46        return Ok(None)
47    }
48
49    // get previous env
50    let previous_env = Box::new(evm.context.env().clone());
51
52    // modify env for pre block call
53    evm_config.fill_tx_env_system_contract_call(
54        &mut evm.context.evm.env,
55        alloy_eips::eip4788::SYSTEM_ADDRESS,
56        HISTORY_STORAGE_ADDRESS,
57        parent_block_hash.0.into(),
58    );
59
60    let mut res = match evm.transact() {
61        Ok(res) => res,
62        Err(e) => {
63            evm.context.evm.env = previous_env;
64            return Err(BlockValidationError::BlockHashContractCall { message: e.to_string() }.into())
65        }
66    };
67
68    res.state.remove(&alloy_eips::eip4788::SYSTEM_ADDRESS);
69    res.state.remove(&evm.block().coinbase);
70
71    // re-set the previous env
72    evm.context.evm.env = previous_env;
73
74    Ok(Some(res))
75}
reth_evm/system_calls/eip2935.rs

reth_evm/system_calls/
eip2935.rs
