144 lines
4.8 KiB
Rust
144 lines
4.8 KiB
Rust
// Copyright 2015-2017 Parity Technologies (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/>.
|
|
|
|
//! Interface for Evm externalities.
|
|
|
|
use std::sync::Arc;
|
|
use util::*;
|
|
use call_type::CallType;
|
|
use env_info::EnvInfo;
|
|
use schedule::Schedule;
|
|
use return_data::ReturnData;
|
|
use error::Result;
|
|
|
|
/// 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 and output data.
|
|
Success(U256, ReturnData),
|
|
/// Returned when message call failed.
|
|
/// VM doesn't have to know the reason.
|
|
Failed
|
|
}
|
|
|
|
/// Specifies how an address is calculated for a new contract.
|
|
#[derive(Copy, Clone, PartialEq, Eq)]
|
|
pub enum CreateContractAddress {
|
|
/// Address is calculated from nonce and sender. Pre EIP-86 (Metropolis)
|
|
FromSenderAndNonce,
|
|
/// Address is calculated from code hash. Default since EIP-86
|
|
FromCodeHash,
|
|
/// Address is calculated from code hash and sender. Used by CREATE_P2SH instruction.
|
|
FromSenderAndCodeHash,
|
|
}
|
|
|
|
/// Externalities interface for EVMs
|
|
pub trait Ext {
|
|
/// Returns a value for given key.
|
|
fn storage_at(&self, key: &H256) -> Result<H256>;
|
|
|
|
/// Stores a value for given key.
|
|
fn set_storage(&mut self, key: H256, value: H256) -> Result<()>;
|
|
|
|
/// Determine whether an account exists.
|
|
fn exists(&self, address: &Address) -> Result<bool>;
|
|
|
|
/// Determine whether an account exists and is not null (zero balance/nonce, no code).
|
|
fn exists_and_not_null(&self, address: &Address) -> Result<bool>;
|
|
|
|
/// Balance of the origin account.
|
|
fn origin_balance(&self) -> Result<U256>;
|
|
|
|
/// Returns address balance.
|
|
fn balance(&self, address: &Address) -> Result<U256>;
|
|
|
|
/// Returns the hash of one of the 256 most recent complete blocks.
|
|
fn blockhash(&mut self, number: &U256) -> H256;
|
|
|
|
/// Creates new contract.
|
|
///
|
|
/// Returns gas_left and contract address if contract creation was succesfull.
|
|
fn create(&mut self, gas: &U256, value: &U256, code: &[u8], address: CreateContractAddress) -> ContractCreateResult;
|
|
|
|
/// Message call.
|
|
///
|
|
/// Returns Err, if we run out of gas.
|
|
/// Otherwise returns call_result which contains gas left
|
|
/// and true if subcall was successfull.
|
|
#[cfg_attr(feature="dev", allow(too_many_arguments))]
|
|
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;
|
|
|
|
/// Returns code at given address
|
|
fn extcode(&self, address: &Address) -> Result<Arc<Bytes>>;
|
|
|
|
/// Returns code size at given address
|
|
fn extcodesize(&self, address: &Address) -> Result<usize>;
|
|
|
|
/// Creates log entry with given topics and data
|
|
fn log(&mut self, topics: Vec<H256>, data: &[u8]) -> Result<()>;
|
|
|
|
/// 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: &ReturnData) -> Result<U256>;
|
|
|
|
/// Should be called when contract commits suicide.
|
|
/// Address to which funds should be refunded.
|
|
fn suicide(&mut self, refund_address: &Address) -> Result<()> ;
|
|
|
|
/// Returns schedule.
|
|
fn schedule(&self) -> &Schedule;
|
|
|
|
/// Returns environment info.
|
|
fn env_info(&self) -> &EnvInfo;
|
|
|
|
/// Returns current depth of execution.
|
|
///
|
|
/// 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);
|
|
|
|
/// Decide if any more operations should be traced. Passthrough for the VM trace.
|
|
fn trace_next_instruction(&mut self, _pc: usize, _instruction: u8) -> bool { false }
|
|
|
|
/// Prepare to trace an operation. Passthrough for the VM trace.
|
|
fn trace_prepare_execute(&mut self, _pc: usize, _instruction: u8, _gas_cost: U256) {}
|
|
|
|
/// 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)>) {}
|
|
}
|