state: Add RLP encoding implementation

test/state/CMakeLists.txt

@@ -7,5 +7,6 @@ add_library(evmone::state ALIAS evmone-state)
 target_link_libraries(evmone-state INTERFACE ethash::keccak)
 target_sources(
     evmone-state INTERFACE
+    rlp.hpp
     utils.hpp
 )

test/state/rlp.hpp

@@ -0,0 +1,117 @@
+// evmone: Fast Ethereum Virtual Machine implementation
+// Copyright 2021 The evmone Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include <intx/intx.hpp>
+#include <cassert>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+namespace evmone::rlp
+{
+using bytes = std::basic_string<uint8_t>;
+using bytes_view = std::basic_string_view<uint8_t>;
+
+namespace internal
+{
+template <uint8_t ShortBase, uint8_t LongBase>
+inline bytes encode_length(size_t l)
+{
+    static constexpr auto short_cutoff = 55;
+    static_assert(ShortBase + short_cutoff <= 0xff);
+    assert(l <= 0xffffff);
+
+    if (l <= short_cutoff)
+        return {static_cast<uint8_t>(ShortBase + l)};
+    else if (const auto l0 = static_cast<uint8_t>(l); l <= 0xff)
+        return {LongBase + 1, l0};
+    else if (const auto l1 = static_cast<uint8_t>(l >> 8); l <= 0xffff)
+        return {LongBase + 2, l1, l0};
+    else
+        return {LongBase + 3, static_cast<uint8_t>(l >> 16), l1, l0};
+}
+
+inline bytes wrap_list(const bytes& content)
+{
+    return internal::encode_length<0xc0, 0xf7>(content.size()) + content;
+}
+
+template <typename InputIterator>
+inline bytes encode_container(InputIterator begin, InputIterator end);
+}  // namespace internal
+
+inline bytes_view trim(bytes_view b) noexcept
+{
+    b.remove_prefix(std::min(b.find_first_not_of(uint8_t{0x00}), b.size()));
+    return b;
+}
+
+template <typename T>
+inline decltype(rlp_encode(std::declval<T>())) encode(const T& v)
+{
+    return rlp_encode(v);
+}
+
+inline bytes encode(bytes_view data)
+{
+    static constexpr uint8_t short_base = 0x80;
+    if (data.size() == 1 && data[0] < short_base)
+        return {data[0]};
+
+    auto r = internal::encode_length<short_base, 0xb7>(data.size());
+    r += data;
+    return r;
+}
+
+inline bytes encode(uint64_t x)
+{
+    uint8_t b[sizeof(x)];
+    intx::be::store(b, x);
+    return encode(trim({b, sizeof(b)}));
+}
+
+inline bytes encode(const intx::uint256& x)
+{
+    uint8_t b[sizeof(x)];
+    intx::be::store(b, x);
+    return encode(trim({b, sizeof(b)}));
+}
+
+template <typename T>
+inline bytes encode(const std::vector<T>& v)
+{
+    return internal::encode_container(v.begin(), v.end());
+}
+
+template <typename T, size_t N>
+inline bytes encode(const T (&v)[N])
+{
+    return internal::encode_container(std::begin(v), std::end(v));
+}
+
+/// Encodes the fixed-size collection of heterogeneous values as RLP list.
+template <typename... Types>
+inline bytes tuple(const Types&... elements)
+{
+    return internal::wrap_list((encode(elements) + ...));
+}
+
+/// Encodes the container as RLP list.
+///
+/// @tparam InputIterator  Type of the input iterator.
+/// @param  begin          Begin iterator.
+/// @param  end            End iterator.
+/// @return                Bytes of the RLP list.
+template <typename InputIterator>
+inline bytes internal::encode_container(InputIterator begin, InputIterator end)
+{
+    bytes content;
+    for (auto it = begin; it != end; ++it)
+        content += encode(*it);
+    return wrap_list(content);
+}
+}  // namespace evmone::rlp

test/unittests/CMakeLists.txt

@@ -26,10 +26,11 @@ add_executable(evmone-unittests
     evmone_test.cpp
     execution_state_test.cpp
     instructions_test.cpp
+    state_rlp_test.cpp
     tracing_test.cpp
     utils_test.cpp
 )
-target_link_libraries(evmone-unittests PRIVATE evmone testutils evmc::instructions GTest::gtest GTest::gtest_main)
+target_link_libraries(evmone-unittests PRIVATE evmone evmone::state testutils evmc::instructions GTest::gtest GTest::gtest_main)
 target_include_directories(evmone-unittests PRIVATE ${evmone_private_include_dir})
 
 gtest_discover_tests(evmone-unittests TEST_PREFIX ${PROJECT_NAME}/unittests/)

test/unittests/state_rlp_test.cpp

@@ -0,0 +1,103 @@
+// evmone: Fast Ethereum Virtual Machine implementation
+// Copyright 2022 The evmone Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+#include <gtest/gtest.h>
+#include <test/state/rlp.hpp>
+#include <test/state/utils.hpp>
+#include <test/utils/utils.hpp>
+
+using namespace evmone;
+using namespace evmc::literals;
+using namespace intx;
+
+static constexpr auto emptyBytesHash =
+    0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470_bytes32;
+
+static constexpr auto emptyMPTHash =
+    0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421_bytes32;
+
+TEST(state_rlp, empty_bytes_hash)
+{
+    EXPECT_EQ(keccak256({}), emptyBytesHash);
+}
+
+TEST(state_rlp, empty_mpt_hash)
+{
+    const auto rlp_null = rlp::encode(0);
+    EXPECT_EQ(rlp_null, bytes{0x80});
+    EXPECT_EQ(keccak256(rlp_null), emptyMPTHash);
+}
+
+TEST(state_rlp, encode_string_short)
+{
+    EXPECT_EQ(hex(rlp::encode(0x01)), "01");
+    EXPECT_EQ(hex(rlp::encode(0x31)), "31");
+    EXPECT_EQ(hex(rlp::encode(0x7f)), "7f");
+}
+
+TEST(state_rlp, encode_string_long)
+{
+    const auto buffer = std::make_unique<uint8_t[]>(0xffffff);
+
+    const auto r1 = rlp::encode({buffer.get(), 0xaabb});
+    EXPECT_EQ(r1.size(), 0xaabb + 3);
+    EXPECT_EQ(hex({r1.data(), 10}), "b9aabb00000000000000");
+
+    const auto r2 = rlp::encode({buffer.get(), 0xffff});
+    EXPECT_EQ(r2.size(), 0xffff + 3);
+    EXPECT_EQ(hex({r2.data(), 10}), "b9ffff00000000000000");
+
+    const auto r3 = rlp::encode({buffer.get(), 0xaabbcc});
+    EXPECT_EQ(r3.size(), 0xaabbcc + 4);
+    EXPECT_EQ(hex({r3.data(), 10}), "baaabbcc000000000000");
+
+    const auto r4 = rlp::encode({buffer.get(), 0xffffff});
+    EXPECT_EQ(r4.size(), 0xffffff + 4);
+    EXPECT_EQ(hex({r4.data(), 10}), "baffffff000000000000");
+}
+
+TEST(state_rlp, encode_c_array)
+{
+    uint64_t a[]{1, 2, 3};
+    EXPECT_EQ(hex(rlp::encode(a)), "c3010203");
+}
+
+TEST(state_rlp, encode_vector)
+{
+    const auto x = 0xe1e2e3e4e5e6e7d0d1d2d3d4d5d6d7c0c1c2c3c4c5c6c7b0b1b2b3b4b5b6b7_u256;
+    EXPECT_EQ(
+        hex(rlp::encode(x)), "9fe1e2e3e4e5e6e7d0d1d2d3d4d5d6d7c0c1c2c3c4c5c6c7b0b1b2b3b4b5b6b7");
+    std::vector<uint256> v(0xffffff / 32, x);
+    const auto r = rlp::encode(v);
+    EXPECT_EQ(r.size(), v.size() * 32 + 4);
+}
+
+TEST(state_rlp, encode_account_with_balance)
+{
+    const auto expected = from_hex(
+        "f8 44"
+        "80"
+        "01"
+        "a0 56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421"
+        "a0 c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470");
+
+    const auto r = rlp::tuple(uint64_t{0}, 1_u256, emptyMPTHash, emptyBytesHash);
+    EXPECT_EQ(r, expected);
+}
+
+TEST(state_rlp, encode_storage_value)
+{
+    const auto value = 0x00000000000000000000000000000000000000000000000000000000000001ff_bytes32;
+    const auto xvalue = rlp::encode(rlp::trim(value));
+    EXPECT_EQ(xvalue, from_hex("8201ff"));
+}
+
+TEST(state_rlp, encode_mpt_node)
+{
+    const bytes path{0x20, 0x41};
+    const bytes value{'v', '_', '_', '_', '_', '_', '_', '_', '_', '_', '_', '_', '_', '_', '_',
+        '_', '_', '_', '_', '_', '_', '_', '_', '_', '_', '_', '_', '_', '1'};
+    const auto node = rlp::tuple(path, value);
+    EXPECT_EQ(hex(node), "e18220419d765f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f31");
+}