zk_evm 0.153.12

ZKsync out-of-circuit EraEVM implementation
Documentation 
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use crate::tracing::*;
pub use crate::zkevm_opcode_defs::utils::*;
use crate::zkevm_opcode_defs::{decoding::VmEncodingMode, ethereum_types::U256};
use zk_evm_abstractions::vm::Memory;

use lazy_static::lazy_static;

lazy_static! {
    pub static ref U256_TO_ADDRESS_MASK: U256 = U256::MAX >> (256 - 160);
}

pub fn contract_bytecode_to_words(code: &[[u8; 32]]) -> Vec<U256> {
    code.iter().map(|el| U256::from_big_endian(el)).collect()

    // for code each 8 byte sequence is somehow encoded integer,
    // or full 32 byte word is an integer constant (also encoded with some endianess)

    // let mut result = Vec::with_capacity(code.len());
    // let mut el = U256::zero();
    // for code_word in code.into_iter() {
    //     // each 8 byte sequence is an independent LE encoded u64,
    //     // but machine itself is BE regarding memory queries
    //     el.0[0] = u64::from_le_bytes(code_word[0..8].try_into().unwrap());
    //     el.0[1] = u64::from_le_bytes(code_word[8..16].try_into().unwrap());
    //     el.0[2] = u64::from_le_bytes(code_word[16..24].try_into().unwrap());
    //     el.0[3] = u64::from_le_bytes(code_word[24..32].try_into().unwrap());

    //     result.push(el);
    // }

    // result
}

pub fn address_to_u256(address: &crate::Address) -> U256 {
    let mut buffer = [0u8; 32];
    buffer[12..].copy_from_slice(&address.as_fixed_bytes()[..]);

    U256::from_big_endian(&buffer)
}

pub fn u256_to_address_unchecked(integer: &U256) -> crate::Address {
    let mut buffer = [0u8; 32];
    integer.to_big_endian(&mut buffer);

    crate::Address::from_slice(&buffer[12..32])
}

#[derive(Debug, Default, Clone, Copy)]
pub struct GenericNoopTracer<M: Memory> {
    _marker: std::marker::PhantomData<M>,
}

impl<M: Memory> GenericNoopTracer<M> {
    pub fn new() -> Self {
        Self {
            _marker: std::marker::PhantomData,
        }
    }
}

impl<M: Memory, const N: usize, E: VmEncodingMode<N>> Tracer<N, E> for GenericNoopTracer<M> {
    type SupportedMemory = M;
    fn before_decoding(
        &mut self,
        _state: VmLocalStateData<'_, N, E>,
        _memory: &Self::SupportedMemory,
    ) {
    }
    fn after_decoding(
        &mut self,
        _state: VmLocalStateData<'_, N, E>,
        _data: AfterDecodingData<N, E>,
        _memory: &Self::SupportedMemory,
    ) {
    }
    fn before_execution(
        &mut self,
        _state: VmLocalStateData<'_, N, E>,
        _data: BeforeExecutionData<N, E>,
        _memory: &Self::SupportedMemory,
    ) {
    }
    fn after_execution(
        &mut self,
        _state: VmLocalStateData<'_, N, E>,
        _data: AfterExecutionData<N, E>,
        _memory: &Self::SupportedMemory,
    ) {
    }
}