openethereum/src/externalities.rs

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//! Transaction Execution environment.
use common::*;
use state::*;
use engine::*;
use executive::*;
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use evm::{self, Schedule, Ext, ContractCreateResult, MessageCallResult};
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use substate::*;
/// Policy for handling output data on `RETURN` opcode.
pub enum OutputPolicy<'a> {
/// Return reference to fixed sized output.
/// Used for message calls.
Return(BytesRef<'a>),
/// Init new contract as soon as `RETURN` is called.
InitContract
}
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/// Transaction properties that externalities need to know about.
pub struct OriginInfo {
address: Address,
origin: Address,
gas_price: U256
}
impl OriginInfo {
/// Populates origin info from action params.
pub fn from(params: &ActionParams) -> Self {
OriginInfo {
address: params.address.clone(),
origin: params.origin.clone(),
gas_price: params.gas_price.clone()
}
}
}
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/// Implementation of evm Externalities.
pub struct Externalities<'a> {
state: &'a mut State,
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env_info: &'a EnvInfo,
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engine: &'a Engine,
depth: usize,
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origin_info: OriginInfo,
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substate: &'a mut Substate,
schedule: Schedule,
output: OutputPolicy<'a>
}
impl<'a> Externalities<'a> {
/// Basic `Externalities` constructor.
pub fn new(state: &'a mut State,
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env_info: &'a EnvInfo,
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engine: &'a Engine,
depth: usize,
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origin_info: OriginInfo,
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substate: &'a mut Substate,
output: OutputPolicy<'a>) -> Self {
Externalities {
state: state,
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env_info: env_info,
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engine: engine,
depth: depth,
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origin_info: origin_info,
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substate: substate,
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schedule: engine.schedule(env_info),
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output: output
}
}
}
impl<'a> Ext for Externalities<'a> {
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fn storage_at(&self, key: &H256) -> H256 {
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self.state.storage_at(&self.origin_info.address, key)
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}
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fn set_storage(&mut self, key: H256, value: H256) {
self.state.set_storage(&self.origin_info.address, key, value)
}
fn exists(&self, address: &Address) -> bool {
self.state.exists(address)
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}
fn balance(&self, address: &Address) -> U256 {
self.state.balance(address)
}
fn blockhash(&self, number: &U256) -> H256 {
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match *number < U256::from(self.env_info.number) && number.low_u64() >= cmp::max(256, self.env_info.number) - 256 {
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true => {
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let index = self.env_info.number - number.low_u64() - 1;
let r = self.env_info.last_hashes[index as usize].clone();
trace!("ext: blockhash({}) -> {} self.env_info.number={}\n", number, r, self.env_info.number);
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r
},
false => {
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trace!("ext: blockhash({}) -> null self.env_info.number={}\n", number, self.env_info.number);
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H256::from(&U256::zero())
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},
}
}
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fn create(&mut self, gas: &U256, value: &U256, code: &[u8]) -> ContractCreateResult {
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// create new contract address
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let address = contract_address(&self.origin_info.address, &self.state.nonce(&self.origin_info.address));
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// prepare the params
let params = ActionParams {
code_address: address.clone(),
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address: address.clone(),
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sender: self.origin_info.address.clone(),
origin: self.origin_info.origin.clone(),
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gas: *gas,
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gas_price: self.origin_info.gas_price.clone(),
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value: value.clone(),
code: Some(code.to_vec()),
data: None,
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};
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self.state.inc_nonce(&self.origin_info.address);
let mut ex = Executive::from_parent(self.state, self.env_info, self.engine, self.depth);
// TODO: handle internal error separately
match ex.create(params, self.substate) {
Ok(gas_left) => {
self.substate.contracts_created.push(address.clone());
ContractCreateResult::Created(address, gas_left)
},
_ => ContractCreateResult::Failed
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}
}
fn call(&mut self,
gas: &U256,
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address: &Address,
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value: &U256,
data: &[u8],
code_address: &Address,
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output: &mut [u8]) -> MessageCallResult {
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let params = ActionParams {
code_address: code_address.clone(),
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address: address.clone(),
sender: self.origin_info.address.clone(),
origin: self.origin_info.origin.clone(),
gas: *gas,
gas_price: self.origin_info.gas_price.clone(),
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value: value.clone(),
code: self.state.code(code_address),
data: Some(data.to_vec()),
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};
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let mut ex = Executive::from_parent(self.state, self.env_info, self.engine, self.depth);
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match ex.call(params, self.substate, BytesRef::Fixed(output)) {
Ok(gas_left) => MessageCallResult::Success(gas_left),
_ => MessageCallResult::Failed
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}
}
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fn extcode(&self, address: &Address) -> Bytes {
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self.state.code(address).unwrap_or(vec![])
}
fn ret(&mut self, gas: &U256, data: &[u8]) -> Result<U256, evm::Error> {
match &mut self.output {
&mut OutputPolicy::Return(BytesRef::Fixed(ref mut slice)) => unsafe {
let len = cmp::min(slice.len(), data.len());
ptr::copy(data.as_ptr(), slice.as_mut_ptr(), len);
Ok(*gas)
},
&mut OutputPolicy::Return(BytesRef::Flexible(ref mut vec)) => unsafe {
vec.clear();
vec.reserve(data.len());
ptr::copy(data.as_ptr(), vec.as_mut_ptr(), data.len());
vec.set_len(data.len());
Ok(*gas)
},
&mut OutputPolicy::InitContract => {
let return_cost = U256::from(data.len()) * U256::from(self.schedule.create_data_gas);
if return_cost > *gas {
return match self.schedule.exceptional_failed_code_deposit {
true => Err(evm::Error::OutOfGas),
false => Ok(*gas)
}
}
let mut code = vec![];
code.reserve(data.len());
unsafe {
ptr::copy(data.as_ptr(), code.as_mut_ptr(), data.len());
code.set_len(data.len());
}
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let address = &self.origin_info.address;
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self.state.init_code(address, code);
Ok(*gas - return_cost)
}
}
}
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fn log(&mut self, topics: Vec<H256>, data: &[u8]) {
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let address = self.origin_info.address.clone();
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self.substate.logs.push(LogEntry::new(address, topics, data.to_vec()));
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}
fn suicide(&mut self, refund_address: &Address) {
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let address = self.origin_info.address.clone();
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let balance = self.balance(&address);
self.state.transfer_balance(&address, refund_address, &balance);
self.substate.suicides.insert(address);
}
fn schedule(&self) -> &Schedule {
&self.schedule
}
fn env_info(&self) -> &EnvInfo {
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&self.env_info
}
fn depth(&self) -> usize {
self.depth
}
fn inc_sstore_clears(&mut self) {
self.substate.sstore_clears_count = self.substate.sstore_clears_count + U256::one();
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}
}