mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
765 lines
25 KiB
C++
765 lines
25 KiB
C++
/* EVMC: Ethereum Client-VM Connector API.
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* Copyright 2018-2019 The EVMC Authors.
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* Licensed under the Apache License, Version 2.0.
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*/
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#pragma once
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#include <evmc/evmc.h>
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#include <evmc/helpers.h>
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#include <functional>
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#include <initializer_list>
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#include <utility>
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/// EVMC C++ API - wrappers and bindings for C++
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/// @ingroup cpp
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namespace evmc
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{
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/// The big-endian 160-bit hash suitable for keeping an Ethereum address.
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///
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/// This type wraps C ::evmc_address to make sure objects of this type are always initialized.
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struct address : evmc_address
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{
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/// Default and converting constructor.
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///
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/// Initializes bytes to zeros if not other @p init value provided.
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constexpr address(evmc_address init = {}) noexcept : evmc_address{init} {}
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/// Explicit operator converting to bool.
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constexpr inline explicit operator bool() const noexcept;
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};
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/// The fixed size array of 32 bytes for storing 256-bit EVM values.
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///
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/// This type wraps C ::evmc_bytes32 to make sure objects of this type are always initialized.
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struct bytes32 : evmc_bytes32
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{
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/// Default and converting constructor.
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///
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/// Initializes bytes to zeros if not other @p init value provided.
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constexpr bytes32(evmc_bytes32 init = {}) noexcept : evmc_bytes32{init} {}
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/// Explicit operator converting to bool.
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constexpr inline explicit operator bool() const noexcept;
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};
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/// The alias for evmc::bytes32 to represent a big-endian 256-bit integer.
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using uint256be = bytes32;
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/// Loads 64 bits / 8 bytes of data from the given @p bytes array in big-endian order.
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constexpr inline uint64_t load64be(const uint8_t* bytes) noexcept
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{
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// TODO: Report bug in clang incorrectly optimizing this with AVX2 enabled.
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return (uint64_t{bytes[0]} << 56) | (uint64_t{bytes[1]} << 48) | (uint64_t{bytes[2]} << 40) |
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(uint64_t{bytes[3]} << 32) | (uint64_t{bytes[4]} << 24) | (uint64_t{bytes[5]} << 16) |
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(uint64_t{bytes[6]} << 8) | uint64_t{bytes[7]};
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}
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/// Loads 32 bits / 4 bytes of data from the given @p bytes array in big-endian order.
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constexpr inline uint32_t load32be(const uint8_t* bytes) noexcept
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{
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return (uint32_t{bytes[0]} << 24) | (uint32_t{bytes[1]} << 16) | (uint32_t{bytes[2]} << 8) |
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uint32_t{bytes[3]};
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}
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namespace fnv
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{
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constexpr auto prime = 0x100000001b3; ///< The 64-bit FNV prime number.
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constexpr auto offset_basis = 0xcbf29ce484222325; ///< The 64-bit FNV offset basis.
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/// The hashing transformation for 64-bit inputs based on the FNV-1a formula.
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constexpr inline uint64_t fnv1a_by64(uint64_t h, uint64_t x) noexcept
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{
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return (h ^ x) * prime;
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}
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} // namespace fnv
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/// The "equal" comparison operator for the evmc::address type.
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constexpr bool operator==(const address& a, const address& b) noexcept
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{
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// TODO: Report bug in clang keeping unnecessary bswap.
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return load64be(&a.bytes[0]) == load64be(&b.bytes[0]) &&
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load64be(&a.bytes[8]) == load64be(&b.bytes[8]) &&
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load32be(&a.bytes[16]) == load32be(&b.bytes[16]);
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}
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/// The "not equal" comparison operator for the evmc::address type.
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constexpr bool operator!=(const address& a, const address& b) noexcept
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{
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return !(a == b);
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}
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/// The "less" comparison operator for the evmc::address type.
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constexpr bool operator<(const address& a, const address& b) noexcept
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{
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return load64be(&a.bytes[0]) < load64be(&b.bytes[0]) ||
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(load64be(&a.bytes[0]) == load64be(&b.bytes[0]) &&
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load64be(&a.bytes[8]) < load64be(&b.bytes[8])) ||
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(load64be(&a.bytes[8]) == load64be(&b.bytes[8]) &&
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load32be(&a.bytes[16]) < load32be(&b.bytes[16]));
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}
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/// The "equal" comparison operator for the evmc::bytes32 type.
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constexpr bool operator==(const bytes32& a, const bytes32& b) noexcept
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{
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return load64be(&a.bytes[0]) == load64be(&b.bytes[0]) &&
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load64be(&a.bytes[8]) == load64be(&b.bytes[8]) &&
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load64be(&a.bytes[16]) == load64be(&b.bytes[16]) &&
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load64be(&a.bytes[24]) == load64be(&b.bytes[24]);
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}
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/// The "not equal" comparison operator for the evmc::bytes32 type.
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constexpr bool operator!=(const bytes32& a, const bytes32& b) noexcept
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{
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return !(a == b);
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}
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/// The "less" comparison operator for the evmc::bytes32 type.
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constexpr bool operator<(const bytes32& a, const bytes32& b) noexcept
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{
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return load64be(&a.bytes[0]) < load64be(&b.bytes[0]) ||
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(load64be(&a.bytes[0]) == load64be(&b.bytes[0]) &&
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load64be(&a.bytes[8]) < load64be(&b.bytes[8])) ||
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(load64be(&a.bytes[8]) == load64be(&b.bytes[8]) &&
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load64be(&a.bytes[16]) < load64be(&b.bytes[16])) ||
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(load64be(&a.bytes[16]) == load64be(&b.bytes[16]) &&
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load64be(&a.bytes[24]) < load64be(&b.bytes[24]));
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}
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/// Checks if the given address is the zero address.
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constexpr inline bool is_zero(const address& a) noexcept
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{
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return a == address{};
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}
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constexpr address::operator bool() const noexcept
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{
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return !is_zero(*this);
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}
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/// Checks if the given bytes32 object has all zero bytes.
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constexpr inline bool is_zero(const bytes32& a) noexcept
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{
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return a == bytes32{};
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}
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constexpr bytes32::operator bool() const noexcept
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{
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return !is_zero(*this);
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}
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namespace literals
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{
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namespace internal
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{
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template <typename T, T... Ints>
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struct integer_sequence
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{
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};
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template <uint8_t... Bytes>
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using byte_sequence = integer_sequence<uint8_t, Bytes...>;
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template <char... Chars>
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using char_sequence = integer_sequence<char, Chars...>;
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template <typename, typename>
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struct concatenate;
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template <uint8_t... Bytes1, uint8_t... Bytes2>
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struct concatenate<byte_sequence<Bytes1...>, byte_sequence<Bytes2...>>
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{
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using type = byte_sequence<Bytes1..., Bytes2...>;
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};
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template <uint8_t D>
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constexpr uint8_t parse_hex_digit() noexcept
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{
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static_assert((D >= '0' && D <= '9') || (D >= 'a' && D <= 'f') || (D >= 'A' && D <= 'F'),
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"literal must be hexadecimal integer");
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return static_cast<uint8_t>(
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(D >= '0' && D <= '9') ? D - '0' : (D >= 'a' && D <= 'f') ? D - 'a' + 10 : D - 'A' + 10);
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}
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template <typename>
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struct parse_digits;
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template <uint8_t Digit1, uint8_t Digit2>
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struct parse_digits<byte_sequence<Digit1, Digit2>>
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{
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using type = byte_sequence<static_cast<uint8_t>(parse_hex_digit<Digit1>() << 4) |
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parse_hex_digit<Digit2>()>;
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};
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template <uint8_t Digit1, uint8_t Digit2, uint8_t... Rest>
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struct parse_digits<byte_sequence<Digit1, Digit2, Rest...>>
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{
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using type = typename concatenate<typename parse_digits<byte_sequence<Digit1, Digit2>>::type,
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typename parse_digits<byte_sequence<Rest...>>::type>::type;
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};
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template <typename, typename>
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struct parse_literal;
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template <typename T, char Prefix1, char Prefix2, char... Literal>
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struct parse_literal<T, char_sequence<Prefix1, Prefix2, Literal...>>
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{
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static_assert(Prefix1 == '0' && Prefix2 == 'x', "literal must be in hexadecimal notation");
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static_assert(sizeof...(Literal) == sizeof(T) * 2, "literal must match the result type size");
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template <uint8_t... Bytes>
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static constexpr T create_from(byte_sequence<Bytes...>) noexcept
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{
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return T{{{Bytes...}}};
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}
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static constexpr T get() noexcept
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{
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return create_from(typename parse_digits<byte_sequence<Literal...>>::type{});
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}
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};
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template <typename T, char Digit>
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struct parse_literal<T, char_sequence<Digit>>
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{
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static_assert(Digit == '0', "only 0 is allowed as a single digit literal");
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static constexpr T get() noexcept { return {}; }
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};
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template <typename T, char... Literal>
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constexpr T parse() noexcept
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{
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return parse_literal<T, char_sequence<Literal...>>::get();
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}
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} // namespace internal
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/// Literal for evmc::address.
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template <char... Literal>
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constexpr address operator"" _address() noexcept
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{
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return internal::parse<address, Literal...>();
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}
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/// Literal for evmc::bytes32.
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template <char... Literal>
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constexpr bytes32 operator"" _bytes32() noexcept
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{
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return internal::parse<bytes32, Literal...>();
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}
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} // namespace literals
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using namespace literals;
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/// Alias for evmc_make_result().
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constexpr auto make_result = evmc_make_result;
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/// @copydoc evmc_result
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///
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/// This is a RAII wrapper for evmc_result and objects of this type
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/// automatically release attached resources.
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class result : private evmc_result
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{
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public:
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using evmc_result::create_address;
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using evmc_result::gas_left;
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using evmc_result::output_data;
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using evmc_result::output_size;
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using evmc_result::status_code;
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/// Creates the result from the provided arguments.
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///
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/// The provided output is copied to memory allocated with malloc()
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/// and the evmc_result::release function is set to one invoking free().
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///
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/// @param _status_code The status code.
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/// @param _gas_left The amount of gas left.
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/// @param _output_data The pointer to the output.
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/// @param _output_size The output size.
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result(evmc_status_code _status_code,
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int64_t _gas_left,
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const uint8_t* _output_data,
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size_t _output_size) noexcept
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: evmc_result{make_result(_status_code, _gas_left, _output_data, _output_size)}
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{}
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/// Converting constructor from raw evmc_result.
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explicit result(evmc_result const& res) noexcept : evmc_result{res} {}
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/// Destructor responsible for automatically releasing attached resources.
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~result() noexcept
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{
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if (release)
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release(this);
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}
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/// Move constructor.
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result(result&& other) noexcept : evmc_result{other}
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{
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other.release = nullptr; // Disable releasing of the rvalue object.
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}
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/// Move assignment operator.
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///
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/// The self-assigment MUST never happen.
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///
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/// @param other The other result object.
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/// @return The reference to the left-hand side object.
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result& operator=(result&& other) noexcept
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{
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this->~result(); // Release this object.
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static_cast<evmc_result&>(*this) = other; // Copy data.
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other.release = nullptr; // Disable releasing of the rvalue object.
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return *this;
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}
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/// Releases the ownership and returns the raw copy of evmc_result.
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///
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/// This method drops the ownership of the result
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/// (result's resources are not going to be released when this object is destructed).
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/// It is the caller's responsibility having the returned copy of the result to release it.
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/// This object MUST NOT be used after this method is invoked.
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///
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/// @return The copy of this object converted to raw evmc_result.
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evmc_result release_raw() noexcept
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{
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const auto out = evmc_result{*this}; // Copy data.
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this->release = nullptr; // Disable releasing of this object.
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return out;
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}
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};
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/// The EVMC Host interface
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class HostInterface
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{
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public:
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virtual ~HostInterface() noexcept = default;
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/// @copydoc evmc_host_interface::account_exists
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virtual bool account_exists(const address& addr) noexcept = 0;
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/// @copydoc evmc_host_interface::get_storage
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virtual bytes32 get_storage(const address& addr, const bytes32& key) noexcept = 0;
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/// @copydoc evmc_host_interface::set_storage
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virtual evmc_storage_status set_storage(const address& addr,
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const bytes32& key,
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const bytes32& value) noexcept = 0;
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/// @copydoc evmc_host_interface::get_balance
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virtual uint256be get_balance(const address& addr) noexcept = 0;
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/// @copydoc evmc_host_interface::get_code_size
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virtual size_t get_code_size(const address& addr) noexcept = 0;
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/// @copydoc evmc_host_interface::get_code_hash
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virtual bytes32 get_code_hash(const address& addr) noexcept = 0;
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/// @copydoc evmc_host_interface::copy_code
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virtual size_t copy_code(const address& addr,
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size_t code_offset,
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uint8_t* buffer_data,
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size_t buffer_size) noexcept = 0;
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/// @copydoc evmc_host_interface::selfdestruct
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virtual void selfdestruct(const address& addr, const address& beneficiary) noexcept = 0;
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/// @copydoc evmc_host_interface::call
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virtual result call(const evmc_message& msg) noexcept = 0;
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/// @copydoc evmc_host_interface::get_tx_context
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virtual evmc_tx_context get_tx_context() noexcept = 0;
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/// @copydoc evmc_host_interface::get_block_hash
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virtual bytes32 get_block_hash(int64_t block_number) noexcept = 0;
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/// @copydoc evmc_host_interface::emit_log
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virtual void emit_log(const address& addr,
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const uint8_t* data,
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size_t data_size,
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const bytes32 topics[],
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size_t num_topics) noexcept = 0;
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};
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/// Wrapper around EVMC host context / host interface.
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///
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/// To be used by VM implementations as better alternative to using ::evmc_host_context directly.
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class HostContext : public HostInterface
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{
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const evmc_host_interface* host = nullptr;
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evmc_host_context* context = nullptr;
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evmc_tx_context tx_context = {};
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public:
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/// Default constructor for null Host context.
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HostContext() = default;
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/// Constructor from the EVMC Host primitives.
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/// @param interface The reference to the Host interface.
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/// @param ctx The pointer to the Host context object. This parameter MAY be null.
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HostContext(const evmc_host_interface& interface, evmc_host_context* ctx) noexcept
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: host{&interface}, context{ctx}
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{}
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bool account_exists(const address& address) noexcept final
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{
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return host->account_exists(context, &address);
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}
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bytes32 get_storage(const address& address, const bytes32& key) noexcept final
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{
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return host->get_storage(context, &address, &key);
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}
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evmc_storage_status set_storage(const address& address,
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const bytes32& key,
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const bytes32& value) noexcept final
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{
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return host->set_storage(context, &address, &key, &value);
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}
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uint256be get_balance(const address& address) noexcept final
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{
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return host->get_balance(context, &address);
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}
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size_t get_code_size(const address& address) noexcept final
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{
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return host->get_code_size(context, &address);
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}
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bytes32 get_code_hash(const address& address) noexcept final
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{
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return host->get_code_hash(context, &address);
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}
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size_t copy_code(const address& address,
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size_t code_offset,
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uint8_t* buffer_data,
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size_t buffer_size) noexcept final
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{
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return host->copy_code(context, &address, code_offset, buffer_data, buffer_size);
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}
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void selfdestruct(const address& addr, const address& beneficiary) noexcept final
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{
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host->selfdestruct(context, &addr, &beneficiary);
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}
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result call(const evmc_message& message) noexcept final
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{
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return result{host->call(context, &message)};
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}
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/// @copydoc HostInterface::get_tx_context()
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///
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/// The implementation caches the received transaction context
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/// by assuming that the block timestamp should never be zero.
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///
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/// @return The cached transaction context.
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evmc_tx_context get_tx_context() noexcept final
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{
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if (tx_context.block_timestamp == 0)
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tx_context = host->get_tx_context(context);
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return tx_context;
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}
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bytes32 get_block_hash(int64_t number) noexcept final
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{
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return host->get_block_hash(context, number);
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}
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void emit_log(const address& addr,
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const uint8_t* data,
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size_t data_size,
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const bytes32 topics[],
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size_t topics_count) noexcept final
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{
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host->emit_log(context, &addr, data, data_size, topics, topics_count);
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}
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};
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/// Abstract class to be used by Host implementations.
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///
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/// When implementing EVMC Host, you can directly inherit from the evmc::Host class.
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/// This way your implementation will be simpler by avoiding manual handling
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/// of the ::evmc_host_context and the ::evmc_host_interface.
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class Host : public HostInterface
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{
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public:
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/// Provides access to the global host interface.
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/// @returns Reference to the host interface object.
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static const evmc_host_interface& get_interface() noexcept;
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/// Converts the Host object to the opaque host context pointer.
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/// @returns Pointer to evmc_host_context.
|
|
evmc_host_context* to_context() noexcept { return reinterpret_cast<evmc_host_context*>(this); }
|
|
|
|
/// Converts the opaque host context pointer back to the original Host object.
|
|
/// @tparam DerivedClass The class derived from the Host class.
|
|
/// @param context The opaque host context pointer.
|
|
/// @returns The pointer to DerivedClass.
|
|
template <typename DerivedClass = Host>
|
|
static DerivedClass* from_context(evmc_host_context* context) noexcept
|
|
{
|
|
// Get pointer of the Host base class.
|
|
auto* h = reinterpret_cast<Host*>(context);
|
|
|
|
// Additional downcast, only possible if DerivedClass inherits from Host.
|
|
return static_cast<DerivedClass*>(h);
|
|
}
|
|
};
|
|
|
|
|
|
/// @copybrief evmc_vm
|
|
///
|
|
/// This is a RAII wrapper for evmc_vm, and object of this type
|
|
/// automatically destroys the VM instance.
|
|
class VM
|
|
{
|
|
public:
|
|
VM() noexcept = default;
|
|
|
|
/// Converting constructor from evmc_vm.
|
|
explicit VM(evmc_vm* vm) noexcept : m_instance{vm} {}
|
|
|
|
/// Destructor responsible for automatically destroying the VM instance.
|
|
~VM() noexcept
|
|
{
|
|
if (m_instance)
|
|
m_instance->destroy(m_instance);
|
|
}
|
|
|
|
VM(const VM&) = delete;
|
|
VM& operator=(const VM&) = delete;
|
|
|
|
/// Move constructor.
|
|
VM(VM&& other) noexcept : m_instance{other.m_instance} { other.m_instance = nullptr; }
|
|
|
|
/// Move assignment operator.
|
|
VM& operator=(VM&& other) noexcept
|
|
{
|
|
this->~VM();
|
|
m_instance = other.m_instance;
|
|
other.m_instance = nullptr;
|
|
return *this;
|
|
}
|
|
|
|
/// The constructor that captures a VM instance and configures the instance
|
|
/// with the provided list of options.
|
|
inline VM(evmc_vm* vm,
|
|
std::initializer_list<std::pair<const char*, const char*>> options) noexcept;
|
|
|
|
/// Checks if contains a valid pointer to the VM instance.
|
|
explicit operator bool() const noexcept { return m_instance != nullptr; }
|
|
|
|
/// Checks whenever the VM instance is ABI compatible with the current EVMC API.
|
|
bool is_abi_compatible() const noexcept { return m_instance->abi_version == EVMC_ABI_VERSION; }
|
|
|
|
/// @copydoc evmc_vm::name
|
|
char const* name() const noexcept { return m_instance->name; }
|
|
|
|
/// @copydoc evmc_vm::version
|
|
char const* version() const noexcept { return m_instance->version; }
|
|
|
|
/// @copydoc evmc::vm::get_capabilities
|
|
evmc_capabilities_flagset get_capabilities() const noexcept
|
|
{
|
|
return m_instance->get_capabilities(m_instance);
|
|
}
|
|
|
|
/// @copydoc evmc_set_option()
|
|
evmc_set_option_result set_option(const char name[], const char value[]) noexcept
|
|
{
|
|
return evmc_set_option(m_instance, name, value);
|
|
}
|
|
|
|
/// @copydoc evmc_execute()
|
|
result execute(const evmc_host_interface& host,
|
|
evmc_host_context* ctx,
|
|
evmc_revision rev,
|
|
const evmc_message& msg,
|
|
const uint8_t* code,
|
|
size_t code_size) noexcept
|
|
{
|
|
return result{m_instance->execute(m_instance, &host, ctx, rev, &msg, code, code_size)};
|
|
}
|
|
|
|
/// Convenient variant of the VM::execute() that takes reference to evmc::Host class.
|
|
result execute(Host& host,
|
|
evmc_revision rev,
|
|
const evmc_message& msg,
|
|
const uint8_t* code,
|
|
size_t code_size) noexcept
|
|
{
|
|
return execute(Host::get_interface(), host.to_context(), rev, msg, code, code_size);
|
|
}
|
|
|
|
/// Executes code without the Host context.
|
|
///
|
|
/// The same as
|
|
/// execute(const evmc_host_interface&, evmc_host_context*, evmc_revision,
|
|
/// const evmc_message&, const uint8_t*, size_t),
|
|
/// but without providing the Host context and interface.
|
|
/// This method is for experimental precompiles support where execution is
|
|
/// guaranteed not to require any Host access.
|
|
result execute(evmc_revision rev,
|
|
const evmc_message& msg,
|
|
const uint8_t* code,
|
|
size_t code_size) noexcept
|
|
{
|
|
return result{
|
|
m_instance->execute(m_instance, nullptr, nullptr, rev, &msg, code, code_size)};
|
|
}
|
|
|
|
private:
|
|
evmc_vm* m_instance = nullptr;
|
|
};
|
|
|
|
inline VM::VM(evmc_vm* vm,
|
|
std::initializer_list<std::pair<const char*, const char*>> options) noexcept
|
|
: m_instance{vm}
|
|
{
|
|
// This constructor is implemented outside of the class definition to workaround a doxygen bug.
|
|
for (const auto& option : options)
|
|
set_option(option.first, option.second);
|
|
}
|
|
|
|
|
|
namespace internal
|
|
{
|
|
inline bool account_exists(evmc_host_context* h, const evmc_address* addr) noexcept
|
|
{
|
|
return Host::from_context(h)->account_exists(*addr);
|
|
}
|
|
|
|
inline evmc_bytes32 get_storage(evmc_host_context* h,
|
|
const evmc_address* addr,
|
|
const evmc_bytes32* key) noexcept
|
|
{
|
|
return Host::from_context(h)->get_storage(*addr, *key);
|
|
}
|
|
|
|
inline evmc_storage_status set_storage(evmc_host_context* h,
|
|
const evmc_address* addr,
|
|
const evmc_bytes32* key,
|
|
const evmc_bytes32* value) noexcept
|
|
{
|
|
return Host::from_context(h)->set_storage(*addr, *key, *value);
|
|
}
|
|
|
|
inline evmc_uint256be get_balance(evmc_host_context* h, const evmc_address* addr) noexcept
|
|
{
|
|
return Host::from_context(h)->get_balance(*addr);
|
|
}
|
|
|
|
inline size_t get_code_size(evmc_host_context* h, const evmc_address* addr) noexcept
|
|
{
|
|
return Host::from_context(h)->get_code_size(*addr);
|
|
}
|
|
|
|
inline evmc_bytes32 get_code_hash(evmc_host_context* h, const evmc_address* addr) noexcept
|
|
{
|
|
return Host::from_context(h)->get_code_hash(*addr);
|
|
}
|
|
|
|
inline size_t copy_code(evmc_host_context* h,
|
|
const evmc_address* addr,
|
|
size_t code_offset,
|
|
uint8_t* buffer_data,
|
|
size_t buffer_size) noexcept
|
|
{
|
|
return Host::from_context(h)->copy_code(*addr, code_offset, buffer_data, buffer_size);
|
|
}
|
|
|
|
inline void selfdestruct(evmc_host_context* h,
|
|
const evmc_address* addr,
|
|
const evmc_address* beneficiary) noexcept
|
|
{
|
|
Host::from_context(h)->selfdestruct(*addr, *beneficiary);
|
|
}
|
|
|
|
inline evmc_result call(evmc_host_context* h, const evmc_message* msg) noexcept
|
|
{
|
|
return Host::from_context(h)->call(*msg).release_raw();
|
|
}
|
|
|
|
inline evmc_tx_context get_tx_context(evmc_host_context* h) noexcept
|
|
{
|
|
return Host::from_context(h)->get_tx_context();
|
|
}
|
|
|
|
inline evmc_bytes32 get_block_hash(evmc_host_context* h, int64_t block_number) noexcept
|
|
{
|
|
return Host::from_context(h)->get_block_hash(block_number);
|
|
}
|
|
|
|
inline void emit_log(evmc_host_context* h,
|
|
const evmc_address* addr,
|
|
const uint8_t* data,
|
|
size_t data_size,
|
|
const evmc_bytes32 topics[],
|
|
size_t num_topics) noexcept
|
|
{
|
|
Host::from_context(h)->emit_log(*addr, data, data_size, static_cast<const bytes32*>(topics),
|
|
num_topics);
|
|
}
|
|
} // namespace internal
|
|
|
|
inline const evmc_host_interface& Host::get_interface() noexcept
|
|
{
|
|
static constexpr evmc_host_interface interface{
|
|
::evmc::internal::account_exists, ::evmc::internal::get_storage,
|
|
::evmc::internal::set_storage, ::evmc::internal::get_balance,
|
|
::evmc::internal::get_code_size, ::evmc::internal::get_code_hash,
|
|
::evmc::internal::copy_code, ::evmc::internal::selfdestruct,
|
|
::evmc::internal::call, ::evmc::internal::get_tx_context,
|
|
::evmc::internal::get_block_hash, ::evmc::internal::emit_log};
|
|
return interface;
|
|
}
|
|
} // namespace evmc
|
|
|
|
|
|
namespace std
|
|
{
|
|
/// Hash operator template specialization for evmc::address. Needed for unordered containers.
|
|
template <>
|
|
struct hash<evmc::address>
|
|
{
|
|
/// Hash operator using FNV1a-based folding.
|
|
constexpr size_t operator()(const evmc::address& s) const noexcept
|
|
{
|
|
using namespace evmc;
|
|
using namespace fnv;
|
|
return static_cast<size_t>(fnv1a_by64(
|
|
fnv1a_by64(fnv1a_by64(fnv::offset_basis, load64be(&s.bytes[0])), load64be(&s.bytes[8])),
|
|
load32be(&s.bytes[16])));
|
|
}
|
|
};
|
|
|
|
/// Hash operator template specialization for evmc::bytes32. Needed for unordered containers.
|
|
template <>
|
|
struct hash<evmc::bytes32>
|
|
{
|
|
/// Hash operator using FNV1a-based folding.
|
|
constexpr size_t operator()(const evmc::bytes32& s) const noexcept
|
|
{
|
|
using namespace evmc;
|
|
using namespace fnv;
|
|
return static_cast<size_t>(
|
|
fnv1a_by64(fnv1a_by64(fnv1a_by64(fnv1a_by64(fnv::offset_basis, load64be(&s.bytes[0])),
|
|
load64be(&s.bytes[8])),
|
|
load64be(&s.bytes[16])),
|
|
load64be(&s.bytes[24])));
|
|
}
|
|
};
|
|
} // namespace std
|