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access.rs
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access.rs
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use crate::{operation::RW, Error};
use eth_types::{evm_types::OpcodeId, Address, GethExecStep, GethExecTrace, ToAddress, Word};
use ethers_core::utils::get_contract_address;
use std::collections::{hash_map::Entry, HashMap, HashSet};
/// State and Code Access with "keys/index" used in the access operation.
#[derive(Debug, PartialEq)]
pub enum AccessValue {
/// Account access
Account {
/// Account address
address: Address,
},
/// Storage access
Storage {
/// Storage account address
address: Address,
/// Storage key
key: Word,
},
/// Code access
Code {
/// Code address
address: Address,
},
}
/// State Access caused by a transaction or an execution step
#[derive(Debug, PartialEq)]
pub struct Access {
step_index: Option<usize>,
rw: RW,
value: AccessValue,
}
impl Access {
pub(crate) fn new(step_index: Option<usize>, rw: RW, value: AccessValue) -> Self {
Self {
step_index,
rw,
value,
}
}
}
/// Given a trace and assuming that the first step is a *CALL*/CREATE* kind
/// opcode, return the result if found.
fn get_call_result(trace: &[GethExecStep]) -> Option<Word> {
let depth = trace[0].depth;
trace[1..]
.iter()
.find(|s| s.depth == depth)
.and_then(|s| s.stack.nth_last(0).ok())
}
/// State and Code Access set.
#[derive(Debug, PartialEq)]
pub struct AccessSet {
/// Set of accounts
pub state: HashMap<Address, HashSet<Word>>,
/// Set of accounts code
pub code: HashSet<Address>,
}
impl From<Vec<Access>> for AccessSet {
fn from(list: Vec<Access>) -> Self {
let mut state: HashMap<Address, HashSet<Word>> = HashMap::new();
let mut code: HashSet<Address> = HashSet::new();
for access in list {
match access.value {
AccessValue::Account { address } => {
state.entry(address).or_insert_with(HashSet::new);
}
AccessValue::Storage { address, key } => match state.entry(address) {
Entry::Vacant(entry) => {
let mut storage = HashSet::new();
storage.insert(key);
entry.insert(storage);
}
Entry::Occupied(mut entry) => {
entry.get_mut().insert(key);
}
},
AccessValue::Code { address } => {
state.entry(address).or_insert_with(HashSet::new);
code.insert(address);
}
}
}
Self { state, code }
}
}
/// Source of the code in the EVM execution.
#[derive(Debug, Clone, Copy)]
pub enum CodeSource {
/// Code comes from a deployed contract at `Address`.
Address(Address),
/// Code comes from tx.data when tx.to == null.
Tx,
/// Code comes from Memory by a CREATE* opcode.
Memory,
}
impl Default for CodeSource {
fn default() -> Self {
Self::Tx
}
}
/// Generate the State Access trace from the given trace. All state read/write
/// accesses are reported, without distinguishing those that happen in revert
/// sections.
pub fn gen_state_access_trace<TX>(
_block: ð_types::Block<TX>,
tx: ð_types::Transaction,
geth_trace: &GethExecTrace,
) -> Result<Vec<Access>, Error> {
use AccessValue::{Account, Code, Storage};
use RW::{READ, WRITE};
let mut call_stack: Vec<(Address, CodeSource)> = Vec::new();
let mut accs = vec![Access::new(None, WRITE, Account { address: tx.from })];
if let Some(to) = tx.to {
call_stack.push((to, CodeSource::Address(to)));
accs.push(Access::new(None, WRITE, Account { address: to }));
// Code may be null if the account is not a contract
accs.push(Access::new(None, READ, Code { address: to }));
} else {
let address = get_contract_address(tx.from, tx.nonce);
call_stack.push((address, CodeSource::Tx));
accs.push(Access::new(None, WRITE, Account { address }));
accs.push(Access::new(None, WRITE, Code { address }));
}
for (index, step) in geth_trace.struct_logs.iter().enumerate() {
let next_step = geth_trace.struct_logs.get(index + 1);
let i = Some(index);
let (contract_address, code_source) = &call_stack[call_stack.len() - 1];
let (contract_address, code_source) = (*contract_address, *code_source);
let (mut push_call_stack, mut pop_call_stack) = (false, false);
if let Some(next_step) = next_step {
push_call_stack = step.depth + 1 == next_step.depth;
pop_call_stack = step.depth - 1 == next_step.depth;
}
match step.op {
OpcodeId::SSTORE => {
let address = contract_address;
let key = step.stack.nth_last(0)?;
accs.push(Access::new(i, WRITE, Storage { address, key }));
}
OpcodeId::SLOAD => {
let address = contract_address;
let key = step.stack.nth_last(0)?;
accs.push(Access::new(i, READ, Storage { address, key }));
}
OpcodeId::SELFBALANCE => {
let address = contract_address;
accs.push(Access::new(i, READ, Account { address }));
}
OpcodeId::CODESIZE => {
if let CodeSource::Address(address) = code_source {
accs.push(Access::new(i, READ, Code { address }));
}
}
OpcodeId::CODECOPY => {
if let CodeSource::Address(address) = code_source {
accs.push(Access::new(i, READ, Code { address }));
}
}
OpcodeId::BALANCE => {
let address = step.stack.nth_last(0)?.to_address();
accs.push(Access::new(i, READ, Account { address }));
}
OpcodeId::EXTCODEHASH => {
let address = step.stack.nth_last(0)?.to_address();
accs.push(Access::new(i, READ, Account { address }));
}
OpcodeId::EXTCODESIZE => {
let address = step.stack.nth_last(0)?.to_address();
accs.push(Access::new(i, READ, Code { address }));
}
OpcodeId::EXTCODECOPY => {
let address = step.stack.nth_last(0)?.to_address();
accs.push(Access::new(i, READ, Code { address }));
}
OpcodeId::SELFDESTRUCT => {
let address = contract_address;
accs.push(Access::new(i, WRITE, Account { address }));
let address = step.stack.nth_last(0)?.to_address();
accs.push(Access::new(i, WRITE, Account { address }));
}
OpcodeId::CREATE => {
if push_call_stack {
// Find CREATE result
let address = get_call_result(&geth_trace.struct_logs[index..])
.unwrap_or_else(Word::zero)
.to_address();
if !address.is_zero() {
accs.push(Access::new(i, WRITE, Account { address }));
accs.push(Access::new(i, WRITE, Code { address }));
}
call_stack.push((address, CodeSource::Address(address)));
}
}
OpcodeId::CREATE2 => {
if push_call_stack {
// Find CREATE2 result
let address = get_call_result(&geth_trace.struct_logs[index..])
.unwrap_or_else(Word::zero)
.to_address();
if !address.is_zero() {
accs.push(Access::new(i, WRITE, Account { address }));
accs.push(Access::new(i, WRITE, Code { address }));
}
call_stack.push((address, CodeSource::Address(address)));
}
}
OpcodeId::CALL => {
let address = contract_address;
accs.push(Access::new(i, WRITE, Account { address }));
let address = step.stack.nth_last(1)?.to_address();
accs.push(Access::new(i, WRITE, Account { address }));
accs.push(Access::new(i, READ, Code { address }));
if push_call_stack {
call_stack.push((address, CodeSource::Address(address)));
}
}
OpcodeId::CALLCODE => {
let address = contract_address;
accs.push(Access::new(i, WRITE, Account { address }));
let address = step.stack.nth_last(1)?.to_address();
accs.push(Access::new(i, WRITE, Account { address }));
accs.push(Access::new(i, READ, Code { address }));
if push_call_stack {
call_stack.push((address, CodeSource::Address(address)));
}
}
OpcodeId::DELEGATECALL => {
let address = step.stack.nth_last(1)?.to_address();
accs.push(Access::new(i, READ, Code { address }));
if push_call_stack {
call_stack.push((contract_address, CodeSource::Address(address)));
}
}
OpcodeId::STATICCALL => {
let address = step.stack.nth_last(1)?.to_address();
accs.push(Access::new(i, READ, Code { address }));
if push_call_stack {
call_stack.push((address, CodeSource::Address(address)));
}
}
_ => {}
}
if pop_call_stack {
if call_stack.len() == 1 {
return Err(Error::InvalidGethExecStep(
"gen_state_access_trace: call stack will be empty",
step.clone(),
));
}
call_stack.pop().expect("call stack is empty");
}
}
Ok(accs)
}