openethereum/ethcore/src/evm/ext.rs

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// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! Interface for Evm externalities.
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use util::*;
use evm::{self, Schedule};
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use env_info::*;
use types::executed::CallType;
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/// Result of externalities create function.
pub enum ContractCreateResult {
/// Returned when creation was successfull.
/// Contains an address of newly created contract and gas left.
Created(Address, U256),
/// Returned when contract creation failed.
/// VM doesn't have to know the reason.
Failed
}
/// Result of externalities call function.
pub enum MessageCallResult {
/// Returned when message call was successfull.
/// Contains gas left.
Success(U256),
/// Returned when message call failed.
/// VM doesn't have to know the reason.
Failed
}
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/// Externalities interface for EVMs
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pub trait Ext {
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/// Returns a value for given key.
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fn storage_at(&self, key: &H256) -> H256;
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/// Stores a value for given key.
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fn set_storage(&mut self, key: H256, value: H256);
/// Determine whether an account exists.
fn exists(&self, address: &Address) -> bool;
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/// Returns address balance.
fn balance(&self, address: &Address) -> U256;
/// Returns the hash of one of the 256 most recent complete blocks.
fn blockhash(&self, number: &U256) -> H256;
/// Creates new contract.
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///
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/// Returns gas_left and contract address if contract creation was succesfull.
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fn create(&mut self, gas: &U256, value: &U256, code: &[u8]) -> ContractCreateResult;
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/// Message call.
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///
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/// Returns Err, if we run out of gas.
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/// Otherwise returns call_result which contains gas left
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/// and true if subcall was successfull.
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#[cfg_attr(feature="dev", allow(too_many_arguments))]
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fn call(&mut self,
gas: &U256,
sender_address: &Address,
receive_address: &Address,
value: Option<U256>,
data: &[u8],
code_address: &Address,
output: &mut [u8],
call_type: CallType
) -> MessageCallResult;
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/// Returns code at given address
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fn extcode(&self, address: &Address) -> Bytes;
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/// Creates log entry with given topics and data
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fn log(&mut self, topics: Vec<H256>, data: &[u8]);
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/// Should be called when transaction calls `RETURN` opcode.
/// Returns gas_left if cost of returning the data is not too high.
fn ret(self, gas: &U256, data: &[u8]) -> evm::Result<U256> where Self: Sized;
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/// Should be called when contract commits suicide.
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/// Address to which funds should be refunded.
fn suicide(&mut self, refund_address: &Address);
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/// Returns schedule.
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fn schedule(&self) -> &Schedule;
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/// Returns environment info.
fn env_info(&self) -> &EnvInfo;
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/// Returns current depth of execution.
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///
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/// If contract A calls contract B, and contract B calls C,
/// then A depth is 0, B is 1, C is 2 and so on.
fn depth(&self) -> usize;
/// Increments sstore refunds count by 1.
fn inc_sstore_clears(&mut self);
/// Prepare to trace an operation. Passthrough for the VM trace.
fn trace_prepare_execute(&mut self, _pc: usize, _instruction: u8, _gas_cost: &U256) -> bool { false }
/// Trace the finalised execution of a single instruction.
fn trace_executed(&mut self, _gas_used: U256, _stack_push: &[U256], _mem_diff: Option<(usize, &[u8])>, _store_diff: Option<(U256, U256)>) {}
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}