openethereum/src/evm/evm.rs

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//! Evm interface.
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use util::uint::U256;
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use evm::{EvmParams, Ext};
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/// Evm errors.
pub enum EvmError {
/// Returned when transaction execution run out of gas.
/// The state should be reverted to the state from before the
/// transaction execution. But it does not mean that transaction
/// was invalid. Balance still should be transfered and nonce
/// should be increased.
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OutOfGas,
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/// Returned on evm internal error. Should never be ignored during development.
/// Likely to cause consensus issues.
Internal,
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}
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/// Evm result.
///
/// Returns gas_left if execution is successfull, otherwise error.
pub type EvmResult = Result<U256, EvmError>;
/// Evm interface.
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pub trait Evm {
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/// This function should be used to execute transaction.
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fn exec(&self, params: &EvmParams, ext: &mut Ext) -> EvmResult;
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}