60 lines
1.7 KiB
Rust
60 lines
1.7 KiB
Rust
//! Evm interface.
|
|
|
|
use common::*;
|
|
use evm::Ext;
|
|
|
|
/// Evm errors.
|
|
#[derive(Debug)]
|
|
pub enum Error {
|
|
/// `OutOfGas` is returned when transaction execution runs 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.
|
|
OutOfGas,
|
|
/// `BadJumpDestination` is returned when execution tried to move
|
|
/// to position that wasn't marked with JUMPDEST instruction
|
|
BadJumpDestination {
|
|
/// Position the code tried to jump to.
|
|
destination: usize
|
|
},
|
|
/// `BadInstructions` is returned when given instruction is not supported
|
|
BadInstruction {
|
|
/// Unrecognized opcode
|
|
instruction: u8,
|
|
},
|
|
/// `StackUnderflow` when there is not enough stack elements to execute instruction
|
|
StackUnderflow {
|
|
/// Invoked instruction
|
|
instruction: &'static str,
|
|
/// How many stack elements was requested by instruction
|
|
wanted: usize,
|
|
/// How many elements were on stack
|
|
on_stack: usize
|
|
},
|
|
/// When execution would exceed defined Stack Limit
|
|
OutOfStack {
|
|
/// Invoked instruction
|
|
instruction: &'static str,
|
|
/// How many stack elements instruction wanted to push
|
|
wanted: usize,
|
|
/// What was the stack limit
|
|
limit: usize
|
|
},
|
|
/// Returned on evm internal error. Should never be ignored during development.
|
|
/// Likely to cause consensus issues.
|
|
#[allow(dead_code)] // created only by jit
|
|
Internal,
|
|
}
|
|
|
|
/// Evm result.
|
|
///
|
|
/// Returns gas_left if execution is successfull, otherwise error.
|
|
pub type Result = result::Result<U256, Error>;
|
|
|
|
/// Evm interface.
|
|
pub trait Evm {
|
|
/// This function should be used to execute transaction.
|
|
fn exec(&self, params: ActionParams, ext: &mut Ext) -> Result;
|
|
}
|