2019-11-21 21:57:22 +00:00
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// EVMC: Ethereum Client-VM Connector API.
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// Copyright 2019 The EVMC Authors.
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// Licensed under the Apache License, Version 2.0.
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#pragma once
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#include <evmc/evmc.hpp>
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#include <algorithm>
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2022-09-16 10:32:12 +00:00
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#include <cassert>
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2021-03-12 08:12:52 +00:00
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#include <map>
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2023-04-23 13:50:16 +00:00
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#include <string>
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2019-11-21 21:57:22 +00:00
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#include <unordered_map>
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#include <vector>
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namespace evmc
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{
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/// The string of bytes.
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using bytes = std::basic_string<uint8_t>;
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2022-11-08 20:48:56 +00:00
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/// Extended value (with original value and access flag) for account storage.
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2022-09-16 10:32:12 +00:00
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struct StorageValue
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2019-11-21 21:57:22 +00:00
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{
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2022-11-08 20:48:56 +00:00
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/// The current storage value.
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bytes32 current;
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2019-11-21 21:57:22 +00:00
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2022-11-08 20:48:56 +00:00
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/// The original storage value.
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bytes32 original;
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2019-11-21 21:57:22 +00:00
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2021-04-21 20:02:33 +00:00
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/// Is the storage key cold or warm.
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2022-11-08 20:48:56 +00:00
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evmc_access_status access_status = EVMC_ACCESS_COLD;
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2021-04-21 20:02:33 +00:00
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2019-11-21 21:57:22 +00:00
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/// Default constructor.
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2022-09-16 10:32:12 +00:00
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StorageValue() noexcept = default;
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/// Constructor sets the current and original to the same value. Optional access status.
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StorageValue(const bytes32& _value, // NOLINT(hicpp-explicit-conversions)
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evmc_access_status _access_status = EVMC_ACCESS_COLD) noexcept
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: current{_value}, original{_value}, access_status{_access_status}
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{}
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/// Constructor with original value and optional access status
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StorageValue(const bytes32& _value,
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const bytes32& _original,
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evmc_access_status _access_status = EVMC_ACCESS_COLD) noexcept
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: current{_value}, original{_original}, access_status{_access_status}
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{}
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2019-11-21 21:57:22 +00:00
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};
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/// Mocked account.
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struct MockedAccount
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{
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/// The account nonce.
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int nonce = 0;
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/// The account code.
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bytes code;
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/// The code hash. Can be a value not related to the actual code.
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bytes32 codehash;
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/// The account balance.
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uint256be balance;
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/// The account storage map.
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std::map<bytes32, StorageValue> storage;
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2019-11-21 21:57:22 +00:00
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/// Helper method for setting balance by numeric type.
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void set_balance(uint64_t x) noexcept
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{
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balance = uint256be{};
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for (std::size_t i = 0; i < sizeof(x); ++i)
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balance.bytes[sizeof(balance) - 1 - i] = static_cast<uint8_t>(x >> (8 * i));
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}
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};
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/// Mocked EVMC Host implementation.
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class MockedHost : public Host
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{
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public:
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/// LOG record.
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struct log_record
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{
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/// The address of the account which created the log.
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address creator;
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/// The data attached to the log.
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bytes data;
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/// The log topics.
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std::vector<bytes32> topics;
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/// Equal operator.
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bool operator==(const log_record& other) const noexcept
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{
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return creator == other.creator && data == other.data && topics == other.topics;
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}
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};
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/// The set of all accounts in the Host, organized by their addresses.
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std::unordered_map<address, MockedAccount> accounts;
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/// The EVMC transaction context to be returned by get_tx_context().
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evmc_tx_context tx_context = {};
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/// The block header hash value to be returned by get_block_hash().
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bytes32 block_hash = {};
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/// The call result to be returned by the call() method.
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evmc_result call_result = {};
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/// The record of all block numbers for which get_block_hash() was called.
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mutable std::vector<int64_t> recorded_blockhashes;
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/// The record of all account accesses.
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mutable std::vector<address> recorded_account_accesses;
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/// The maximum number of entries in recorded_account_accesses record.
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/// This is arbitrary value useful in fuzzing when we don't want the record to explode.
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static constexpr auto max_recorded_account_accesses = 200;
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/// The record of all call messages requested in the call() method.
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std::vector<evmc_message> recorded_calls;
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/// The maximum number of entries in recorded_calls record.
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/// This is arbitrary value useful in fuzzing when we don't want the record to explode.
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static constexpr auto max_recorded_calls = 100;
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/// The record of all LOGs passed to the emit_log() method.
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std::vector<log_record> recorded_logs;
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2022-09-16 10:32:12 +00:00
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/// The record of all SELFDESTRUCTs from the selfdestruct() method
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/// as a map selfdestructed_address => [beneficiary1, beneficiary2, ...].
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std::unordered_map<address, std::vector<address>> recorded_selfdestructs;
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2019-11-21 21:57:22 +00:00
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2020-05-13 21:29:35 +00:00
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private:
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2019-11-21 21:57:22 +00:00
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/// The copy of call inputs for the recorded_calls record.
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std::vector<bytes> m_recorded_calls_inputs;
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/// Record an account access.
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/// @param addr The address of the accessed account.
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void record_account_access(const address& addr) const
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{
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if (recorded_account_accesses.empty())
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recorded_account_accesses.reserve(max_recorded_account_accesses);
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if (recorded_account_accesses.size() < max_recorded_account_accesses)
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recorded_account_accesses.emplace_back(addr);
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}
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2021-04-21 20:02:33 +00:00
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public:
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2019-11-21 21:57:22 +00:00
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/// Returns true if an account exists (EVMC Host method).
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bool account_exists(const address& addr) const noexcept override
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{
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record_account_access(addr);
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return accounts.count(addr) != 0;
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}
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/// Get the account's storage value at the given key (EVMC Host method).
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bytes32 get_storage(const address& addr, const bytes32& key) const noexcept override
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{
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record_account_access(addr);
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const auto account_iter = accounts.find(addr);
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if (account_iter == accounts.end())
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return {};
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const auto storage_iter = account_iter->second.storage.find(key);
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if (storage_iter != account_iter->second.storage.end())
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return storage_iter->second.current;
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return {};
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}
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/// Set the account's storage value (EVMC Host method).
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evmc_storage_status set_storage(const address& addr,
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const bytes32& key,
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const bytes32& value) noexcept override
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{
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record_account_access(addr);
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2022-09-16 10:32:12 +00:00
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// Get the reference to the storage entry value.
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// This will create the account in case it was not present.
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// This is convenient for unit testing and standalone EVM execution to preserve the
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// storage values after the execution terminates.
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auto& s = accounts[addr].storage[key];
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// Follow the EIP-2200 specification as closely as possible.
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// https://eips.ethereum.org/EIPS/eip-2200
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// Warning: this is not the most efficient implementation. The storage status can be
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// figured out by combining only 4 checks:
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// - original != current (dirty)
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// - original == value (restored)
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// - current != 0
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// - value != 0
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const auto status = [&original = s.original, ¤t = s.current, &value]() {
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// Clause 1 is irrelevant:
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// 1. "If gasleft is less than or equal to gas stipend,
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// fail the current call frame with ‘out of gas’ exception"
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// 2. "If current value equals new value (this is a no-op)"
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if (current == value)
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{
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// "SLOAD_GAS is deducted"
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return EVMC_STORAGE_ASSIGNED;
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}
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// 3. "If current value does not equal new value"
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else
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{
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// 3.1. "If original value equals current value
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// (this storage slot has not been changed by the current execution context)"
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if (original == current)
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{
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// 3.1.1 "If original value is 0"
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if (is_zero(original))
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{
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// "SSTORE_SET_GAS is deducted"
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return EVMC_STORAGE_ADDED;
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}
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// 3.1.2 "Otherwise"
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else
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{
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// "SSTORE_RESET_GAS gas is deducted"
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auto st = EVMC_STORAGE_MODIFIED;
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// "If new value is 0"
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if (is_zero(value))
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{
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// "add SSTORE_CLEARS_SCHEDULE gas to refund counter"
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st = EVMC_STORAGE_DELETED;
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}
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return st;
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}
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}
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// 3.2. "If original value does not equal current value
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// (this storage slot is dirty),
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// SLOAD_GAS gas is deducted.
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// Apply both of the following clauses."
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else
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{
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// Because we need to apply "both following clauses"
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// we first collect information which clause is triggered
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// then assign status code to combination of these clauses.
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enum
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{
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None = 0,
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RemoveClearsSchedule = 1 << 0,
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AddClearsSchedule = 1 << 1,
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RestoredBySet = 1 << 2,
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RestoredByReset = 1 << 3,
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};
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int triggered_clauses = None;
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// 3.2.1. "If original value is not 0"
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if (!is_zero(original))
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{
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// 3.2.1.1. "If current value is 0"
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if (is_zero(current))
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{
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// "(also means that new value is not 0)"
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assert(!is_zero(value));
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// "remove SSTORE_CLEARS_SCHEDULE gas from refund counter"
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triggered_clauses |= RemoveClearsSchedule;
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}
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// 3.2.1.2. "If new value is 0"
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if (is_zero(value))
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{
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// "(also means that current value is not 0)"
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assert(!is_zero(current));
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// "add SSTORE_CLEARS_SCHEDULE gas to refund counter"
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triggered_clauses |= AddClearsSchedule;
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}
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}
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// 3.2.2. "If original value equals new value (this storage slot is reset)"
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// Except: we use term 'storage slot restored'.
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if (original == value)
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{
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// 3.2.2.1. "If original value is 0"
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if (is_zero(original))
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{
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// "add SSTORE_SET_GAS - SLOAD_GAS to refund counter"
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triggered_clauses |= RestoredBySet;
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}
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// 3.2.2.2. "Otherwise"
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else
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{
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// "add SSTORE_RESET_GAS - SLOAD_GAS gas to refund counter"
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triggered_clauses |= RestoredByReset;
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}
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}
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switch (triggered_clauses)
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{
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case RemoveClearsSchedule:
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return EVMC_STORAGE_DELETED_ADDED;
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case AddClearsSchedule:
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return EVMC_STORAGE_MODIFIED_DELETED;
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case RemoveClearsSchedule | RestoredByReset:
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return EVMC_STORAGE_DELETED_RESTORED;
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case RestoredBySet:
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return EVMC_STORAGE_ADDED_DELETED;
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case RestoredByReset:
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return EVMC_STORAGE_MODIFIED_RESTORED;
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case None:
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return EVMC_STORAGE_ASSIGNED;
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default:
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assert(false); // Other combinations are impossible.
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return evmc_storage_status{};
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}
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}
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}
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}();
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2019-11-21 21:57:22 +00:00
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2022-09-16 10:32:12 +00:00
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s.current = value; // Finally update the current storage value.
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2019-11-21 21:57:22 +00:00
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|
|
return status;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// Get the account's balance (EVMC Host method).
|
|
|
|
|
uint256be get_balance(const address& addr) const noexcept override
|
|
|
|
|
{
|
|
|
|
|
record_account_access(addr);
|
|
|
|
|
const auto it = accounts.find(addr);
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|
|
if (it == accounts.end())
|
|
|
|
|
return {};
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|
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|
|
return it->second.balance;
|
|
|
|
|
}
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|
|
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|
|
/// Get the account's code size (EVMC host method).
|
|
|
|
|
size_t get_code_size(const address& addr) const noexcept override
|
|
|
|
|
{
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|
|
|
|
record_account_access(addr);
|
|
|
|
|
const auto it = accounts.find(addr);
|
|
|
|
|
if (it == accounts.end())
|
|
|
|
|
return 0;
|
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|
|
|
return it->second.code.size();
|
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|
|
}
|
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|
|
/// Get the account's code hash (EVMC host method).
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|
|
|
bytes32 get_code_hash(const address& addr) const noexcept override
|
|
|
|
|
{
|
|
|
|
|
record_account_access(addr);
|
|
|
|
|
const auto it = accounts.find(addr);
|
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|
|
|
if (it == accounts.end())
|
|
|
|
|
return {};
|
|
|
|
|
return it->second.codehash;
|
|
|
|
|
}
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|
|
/// Copy the account's code to the given buffer (EVMC host method).
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|
|
|
size_t copy_code(const address& addr,
|
|
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|
|
size_t code_offset,
|
|
|
|
|
uint8_t* buffer_data,
|
|
|
|
|
size_t buffer_size) const noexcept override
|
|
|
|
|
{
|
|
|
|
|
record_account_access(addr);
|
|
|
|
|
const auto it = accounts.find(addr);
|
|
|
|
|
if (it == accounts.end())
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
const auto& code = it->second.code;
|
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|
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|
|
if (code_offset >= code.size())
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
const auto n = std::min(buffer_size, code.size() - code_offset);
|
|
|
|
|
|
|
|
|
|
if (n > 0)
|
|
|
|
|
std::copy_n(&code[code_offset], n, buffer_data);
|
|
|
|
|
return n;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// Selfdestruct the account (EVMC host method).
|
2022-09-16 10:32:12 +00:00
|
|
|
|
bool selfdestruct(const address& addr, const address& beneficiary) noexcept override
|
2019-11-21 21:57:22 +00:00
|
|
|
|
{
|
|
|
|
|
record_account_access(addr);
|
2022-09-16 10:32:12 +00:00
|
|
|
|
auto& beneficiaries = recorded_selfdestructs[addr];
|
|
|
|
|
beneficiaries.emplace_back(beneficiary);
|
|
|
|
|
return beneficiaries.size() == 1;
|
2019-11-21 21:57:22 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// Call/create other contract (EVMC host method).
|
2022-09-16 10:32:12 +00:00
|
|
|
|
Result call(const evmc_message& msg) noexcept override
|
2019-11-21 21:57:22 +00:00
|
|
|
|
{
|
2022-09-16 10:32:12 +00:00
|
|
|
|
record_account_access(msg.recipient);
|
2019-11-21 21:57:22 +00:00
|
|
|
|
|
|
|
|
|
if (recorded_calls.empty())
|
|
|
|
|
{
|
|
|
|
|
recorded_calls.reserve(max_recorded_calls);
|
|
|
|
|
m_recorded_calls_inputs.reserve(max_recorded_calls); // Iterators will not invalidate.
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (recorded_calls.size() < max_recorded_calls)
|
|
|
|
|
{
|
|
|
|
|
recorded_calls.emplace_back(msg);
|
|
|
|
|
auto& call_msg = recorded_calls.back();
|
|
|
|
|
if (call_msg.input_size > 0)
|
|
|
|
|
{
|
|
|
|
|
m_recorded_calls_inputs.emplace_back(call_msg.input_data, call_msg.input_size);
|
|
|
|
|
const auto& input_copy = m_recorded_calls_inputs.back();
|
|
|
|
|
call_msg.input_data = input_copy.data();
|
|
|
|
|
}
|
|
|
|
|
}
|
2022-09-16 10:32:12 +00:00
|
|
|
|
return Result{call_result};
|
2019-11-21 21:57:22 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// Get transaction context (EVMC host method).
|
|
|
|
|
evmc_tx_context get_tx_context() const noexcept override { return tx_context; }
|
|
|
|
|
|
|
|
|
|
/// Get the block header hash (EVMC host method).
|
|
|
|
|
bytes32 get_block_hash(int64_t block_number) const noexcept override
|
|
|
|
|
{
|
|
|
|
|
recorded_blockhashes.emplace_back(block_number);
|
|
|
|
|
return block_hash;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// Emit LOG (EVMC host method).
|
|
|
|
|
void emit_log(const address& addr,
|
|
|
|
|
const uint8_t* data,
|
|
|
|
|
size_t data_size,
|
|
|
|
|
const bytes32 topics[],
|
|
|
|
|
size_t topics_count) noexcept override
|
|
|
|
|
{
|
|
|
|
|
recorded_logs.push_back({addr, {data, data_size}, {topics, topics + topics_count}});
|
|
|
|
|
}
|
2021-04-21 20:02:33 +00:00
|
|
|
|
|
|
|
|
|
/// Record an account access.
|
|
|
|
|
///
|
|
|
|
|
/// This method is required by EIP-2929 introduced in ::EVMC_BERLIN. It will record the account
|
|
|
|
|
/// access in MockedHost::recorded_account_accesses and return previous access status.
|
|
|
|
|
/// This methods returns ::EVMC_ACCESS_WARM for known addresses of precompiles.
|
2022-09-16 10:32:12 +00:00
|
|
|
|
/// The EIP-2929 specifies that evmc_message::sender and evmc_message::recipient are always
|
2021-04-21 20:02:33 +00:00
|
|
|
|
/// ::EVMC_ACCESS_WARM. Therefore, you should init the MockedHost with:
|
|
|
|
|
///
|
|
|
|
|
/// mocked_host.access_account(msg.sender);
|
2022-09-16 10:32:12 +00:00
|
|
|
|
/// mocked_host.access_account(msg.recipient);
|
2021-04-21 20:02:33 +00:00
|
|
|
|
///
|
|
|
|
|
/// The same way you can mock transaction access list (EIP-2930) for account addresses.
|
|
|
|
|
///
|
|
|
|
|
/// @param addr The address of the accessed account.
|
|
|
|
|
/// @returns The ::EVMC_ACCESS_WARM if the account has been accessed before,
|
|
|
|
|
/// the ::EVMC_ACCESS_COLD otherwise.
|
|
|
|
|
evmc_access_status access_account(const address& addr) noexcept override
|
|
|
|
|
{
|
|
|
|
|
// Check if the address have been already accessed.
|
|
|
|
|
const auto already_accessed =
|
|
|
|
|
std::find(recorded_account_accesses.begin(), recorded_account_accesses.end(), addr) !=
|
|
|
|
|
recorded_account_accesses.end();
|
|
|
|
|
|
|
|
|
|
record_account_access(addr);
|
|
|
|
|
|
|
|
|
|
// Accessing precompiled contracts is always warm.
|
|
|
|
|
if (addr >= 0x0000000000000000000000000000000000000001_address &&
|
|
|
|
|
addr <= 0x0000000000000000000000000000000000000009_address)
|
|
|
|
|
return EVMC_ACCESS_WARM;
|
|
|
|
|
|
|
|
|
|
return already_accessed ? EVMC_ACCESS_WARM : EVMC_ACCESS_COLD;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// Access the account's storage value at the given key.
|
|
|
|
|
///
|
2022-09-16 10:32:12 +00:00
|
|
|
|
/// This method is required by EIP-2929 introduced in ::EVMC_BERLIN. In records
|
|
|
|
|
/// that the given account's storage key has been access and returns the
|
|
|
|
|
/// previous access status. To mock storage access list (EIP-2930), you can
|
|
|
|
|
/// pre-init account's storage values with the ::EVMC_ACCESS_WARM flag:
|
2021-04-21 20:02:33 +00:00
|
|
|
|
///
|
2022-09-16 10:32:12 +00:00
|
|
|
|
/// mocked_host.accounts[msg.recipient].storage[key] = {value,
|
|
|
|
|
/// EVMC_ACCESS_WARM};
|
2021-04-21 20:02:33 +00:00
|
|
|
|
///
|
|
|
|
|
/// @param addr The account address.
|
|
|
|
|
/// @param key The account's storage key.
|
2022-09-16 10:32:12 +00:00
|
|
|
|
/// @return The ::EVMC_ACCESS_WARM if the storage key has been accessed
|
|
|
|
|
/// before,
|
2021-04-21 20:02:33 +00:00
|
|
|
|
/// the ::EVMC_ACCESS_COLD otherwise.
|
|
|
|
|
evmc_access_status access_storage(const address& addr, const bytes32& key) noexcept override
|
|
|
|
|
{
|
|
|
|
|
auto& value = accounts[addr].storage[key];
|
|
|
|
|
const auto access_status = value.access_status;
|
|
|
|
|
value.access_status = EVMC_ACCESS_WARM;
|
|
|
|
|
return access_status;
|
|
|
|
|
}
|
2019-11-21 21:57:22 +00:00
|
|
|
|
};
|
|
|
|
|
} // namespace evmc
|