Add evmc and host interface implementation. Modify fuzzer harness to make use of evmc host/vm.

.circleci/config.yml

@@ -36,8 +36,9 @@ defaults:
         mkdir -p build
         cd build
         protoc --proto_path=../test/tools/ossfuzz yulProto.proto --cpp_out=../test/tools/ossfuzz
+        protoc --proto_path=../test/tools/ossfuzz abiV2Proto.proto --cpp_out=../test/tools/ossfuzz
         cmake .. -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE:-Release} $CMAKE_OPTIONS
-        make ossfuzz ossfuzz_proto -j4
+        make ossfuzz ossfuzz_proto ossfuzz_abiv2 -j4
 
   - run_proofs: &run_proofs
       name: Correctness proofs for optimization rules
@@ -69,6 +70,7 @@ defaults:
   - artifacts_executables_ossfuzz: &artifacts_executables_ossfuzz
       root: build
       paths:
+        - test/tools/ossfuzz/abiv2_proto_ossfuzz
         - test/tools/ossfuzz/const_opt_ossfuzz
         - test/tools/ossfuzz/solc_noopt_ossfuzz
         - test/tools/ossfuzz/solc_opt_ossfuzz

CMakeLists.txt

@@ -11,7 +11,7 @@ eth_policy()
 
 # project name and version should be set after cmake_policy CMP0048
 set(PROJECT_VERSION "0.5.11")
-project(solidity VERSION ${PROJECT_VERSION} LANGUAGES CXX)
+project(solidity VERSION ${PROJECT_VERSION} LANGUAGES C CXX)
 
 if (${CMAKE_VERSION} VERSION_LESS "3.9.0")
 	# needed for the big endian test for older cmake versions

cmake/templates/license.h.in

@@ -97,6 +97,22 @@ scanner/token:
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+evmc:
+  The code in test/evmc is licensed under the Apache License version 2:
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
+
 All other code is licensed under GPL version 3:
 
 )"};

test/CMakeLists.txt

@@ -30,7 +30,8 @@ add_executable(soltest ${sources} ${headers}
     ${libsolidity_sources} ${libsolidity_headers}
     ${libsolidity_util_sources} ${libsolidity_util_headers}
 )
-target_link_libraries(soltest PRIVATE libsolc yul solidity yulInterpreter evmasm devcore Boost::boost Boost::program_options Boost::unit_test_framework)
+target_link_libraries(soltest PRIVATE libsolc yul solidity yulInterpreter evmasm devcore Boost::boost Boost::program_options Boost::unit_test_framework evmc)
+
 
 # Special compilation flag for Visual Studio (version 2019 at least affected)
 # in order to compile SolidityEndToEndTest.cpp, which is quite huge.
@@ -50,3 +51,4 @@ if (NOT Boost_USE_STATIC_LIBS)
 endif()
 
 add_subdirectory(tools)
+add_subdirectory(evmc)

test/EVMHost.cpp

@@ -0,0 +1,215 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * EVM execution host, i.e. component that implements a simulated Ethereum blockchain
+ * for testing purposes.
+ */
+
+#include <test/EVMHost.h>
+
+#include <test/evmc/helpers.hpp>
+#include <test/evmc/loader.h>
+
+#include <libdevcore/Exceptions.h>
+#include <libdevcore/Assertions.h>
+#include <libdevcore/Keccak256.h>
+#include <libdevcore/picosha2.h>
+
+using namespace std;
+using namespace dev;
+using namespace dev::test;
+
+EVMHost::EVMHost(langutil::EVMVersion _evmVersion, evmc::vm& _vmInstance):
+	m_vm(_vmInstance)
+{
+	if (_evmVersion == langutil::EVMVersion::homestead())
+		m_evmVersion = EVMC_HOMESTEAD;
+	else if (_evmVersion == langutil::EVMVersion::tangerineWhistle())
+		m_evmVersion = EVMC_TANGERINE_WHISTLE;
+	else if (_evmVersion == langutil::EVMVersion::spuriousDragon())
+		m_evmVersion = EVMC_SPURIOUS_DRAGON;
+	else if (_evmVersion == langutil::EVMVersion::byzantium())
+		m_evmVersion = EVMC_BYZANTIUM;
+	else if (_evmVersion == langutil::EVMVersion::constantinople())
+		m_evmVersion = EVMC_CONSTANTINOPLE;
+	else //if (_evmVersion == langutil::EVMVersion::petersburg())
+		m_evmVersion = EVMC_PETERSBURG;
+}
+
+evmc_storage_status EVMHost::set_storage(const evmc_address& _addr, const evmc_bytes32& _key, const evmc_bytes32& _value) noexcept
+{
+	evmc_bytes32 previousValue = m_state.accounts[_addr].storage[_key];
+	m_state.accounts[_addr].storage[_key] = _value;
+
+	// TODO EVMC_STORAGE_MODIFIED_AGAIN should be also used
+	if (previousValue == _value)
+		return EVMC_STORAGE_UNCHANGED;
+	else if (previousValue == evmc_bytes32{})
+		return EVMC_STORAGE_ADDED;
+	else if (_value == evmc_bytes32{})
+		return EVMC_STORAGE_DELETED;
+	else
+		return EVMC_STORAGE_MODIFIED;
+
+}
+
+void EVMHost::selfdestruct(const evmc_address& _addr, const evmc_address& _beneficiary) noexcept
+{
+	// TODO actual selfdestruct is even more complicated.
+	evmc_uint256be balance = m_state.accounts[_addr].balance;
+	m_state.accounts.erase(_addr);
+	m_state.accounts[_beneficiary].balance = balance;
+}
+
+evmc::result EVMHost::call(evmc_message const& _message) noexcept
+{
+	if (_message.destination == convertToEVMC(Address(2)))
+		return precompileSha256(_message);
+
+	State stateBackup = m_state;
+
+	u256 value{convertFromEVMC(_message.value)};
+	Account& sender = m_state.accounts[_message.sender];
+
+	bytes code;
+
+	evmc_message message = _message;
+	if (message.kind == EVMC_CREATE)
+	{
+		// TODO this is not the right formula
+		// TODO is the nonce incremented on failure, too?
+		Address createAddress(keccak256(
+			bytes(begin(message.sender.bytes), end(message.sender.bytes)) +
+			asBytes(to_string(sender.nonce++))
+		));
+		message.destination = convertToEVMC(createAddress);
+		code = bytes(message.input_data, message.input_data + message.input_size);
+	}
+	else if (message.kind == EVMC_DELEGATECALL)
+	{
+		code = m_state.accounts[message.destination].code;
+		message.destination = m_currentAddress;
+	}
+	else if (message.kind == EVMC_CALLCODE)
+	{
+		code = m_state.accounts[message.destination].code;
+		message.destination = m_currentAddress;
+	}
+	else
+		code = m_state.accounts[message.destination].code;
+	//TODO CREATE2
+
+	Account& destination = m_state.accounts[message.destination];
+
+	if (value != 0 && message.kind != EVMC_DELEGATECALL && message.kind != EVMC_CALLCODE)
+	{
+		sender.balance = convertToEVMC(u256(convertFromEVMC(sender.balance)) - value);
+		destination.balance = convertToEVMC(u256(convertFromEVMC(destination.balance)) + value);
+	}
+
+	evmc_address currentAddress = m_currentAddress;
+	m_currentAddress = message.destination;
+	evmc::result result = m_vm.execute(*this, m_evmVersion, message, code.data(), code.size());
+	m_currentAddress = currentAddress;
+
+	if (result.status_code != EVMC_SUCCESS)
+		m_state = stateBackup;
+	else if (message.kind == EVMC_CREATE)
+	{
+		result.create_address = message.destination;
+		destination.code = bytes(result.output_data, result.output_data + result.output_size);
+		destination.codeHash = convertToEVMC(keccak256(destination.code));
+	}
+
+	return result;
+}
+
+evmc_tx_context EVMHost::get_tx_context() noexcept
+{
+	evmc_tx_context ctx = {};
+	ctx.block_timestamp = m_state.timestamp;
+	ctx.block_number = m_state.blockNumber;
+	ctx.block_coinbase = m_coinbase;
+	ctx.block_difficulty = convertToEVMC(u256("200000000"));
+	ctx.block_gas_limit = 20000000;
+	ctx.tx_gas_price = convertToEVMC(u256("3000000000"));
+	ctx.tx_origin = convertToEVMC(Address("0x9292929292929292929292929292929292929292"));
+	return ctx;
+}
+
+evmc_bytes32 EVMHost::get_block_hash(int64_t _number) noexcept
+{
+	return convertToEVMC(u256("0x3737373737373737373737373737373737373737373737373737373737373737") + _number);
+}
+
+void EVMHost::emit_log(
+	evmc_address const& _addr,
+	uint8_t const* _data,
+	size_t _dataSize,
+	evmc_bytes32 const _topics[],
+	size_t _topicsCount
+) noexcept
+{
+	LogEntry entry;
+	entry.address = convertFromEVMC(_addr);
+	for (size_t i = 0; i < _topicsCount; ++i)
+		entry.topics.emplace_back(convertFromEVMC(_topics[i]));
+	entry.data = bytes(_data, _data + _dataSize);
+	m_state.logs.emplace_back(std::move(entry));
+}
+
+
+Address EVMHost::convertFromEVMC(evmc_address const& _addr)
+{
+	return Address(bytes(begin(_addr.bytes), end(_addr.bytes)));
+}
+
+evmc_address EVMHost::convertToEVMC(Address const& _addr)
+{
+	evmc_address a;
+	for (size_t i = 0; i < 20; ++i)
+		a.bytes[i] = _addr[i];
+	return a;
+}
+
+h256 EVMHost::convertFromEVMC(evmc_bytes32 const& _data)
+{
+	return h256(bytes(begin(_data.bytes), end(_data.bytes)));
+}
+
+evmc_bytes32 EVMHost::convertToEVMC(h256 const& _data)
+{
+	evmc_bytes32 d;
+	for (size_t i = 0; i < 32; ++i)
+		d.bytes[i] = _data[i];
+	return d;
+}
+
+evmc::result EVMHost::precompileSha256(evmc_message const& _message) noexcept
+{
+	// static data so that we do not need a release routine...
+	bytes static hash;
+	hash = picosha2::hash256(bytes(
+		_message.input_data,
+		_message.input_data + _message.input_size
+	));
+
+	evmc::result result({});
+	result.output_data = hash.data();
+	result.output_size = hash.size();
+	return result;
+}

test/EVMHost.h

@@ -0,0 +1,175 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * EVM execution host, i.e. component that implements a simulated Ethereum blockchain
+ * for testing purposes.
+ */
+
+#pragma once
+
+#include <test/evmc/evmc.hpp>
+#include <test/evmc/evmc.h>
+#include <test/evmc/helpers.hpp>
+
+#include <liblangutil/EVMVersion.h>
+
+#include <libdevcore/FixedHash.h>
+
+
+namespace dev
+{
+namespace test
+{
+using Address = h160;
+
+class EVMHost: public evmc::Host
+{
+public:
+	explicit EVMHost(langutil::EVMVersion _evmVersion, evmc::vm& _vmInstance);
+
+	struct Account
+	{
+		evmc_uint256be balance = {};
+		size_t nonce = 0;
+		bytes code;
+		evmc_bytes32 codeHash = {};
+		std::map<evmc_bytes32, evmc_bytes32> storage;
+	};
+
+	struct LogEntry
+	{
+		Address address;
+		std::vector<h256> topics;
+		bytes data;
+	};
+
+	struct State
+	{
+		size_t blockNumber;
+		uint64_t timestamp;
+		std::map<evmc_address, Account> accounts;
+		std::vector<LogEntry> logs;
+	};
+
+	Account* account(evmc_address const& _address)
+	{
+		auto it = m_state.accounts.find(_address);
+		return it == m_state.accounts.end() ? nullptr : &it->second;
+	}
+
+	void reset() { m_state = State{}; m_currentAddress = {}; }
+	void newBlock()
+	{
+		m_state.blockNumber++;
+		m_state.timestamp += 15;
+		m_state.logs.clear();
+	}
+
+	bool account_exists(evmc_address const& _addr) noexcept final
+	{
+		return account(_addr) != nullptr;
+	}
+
+	evmc_bytes32 get_storage(evmc_address const& _addr, evmc_bytes32 const& _key) noexcept final
+	{
+		if (Account* acc = account(_addr))
+			return acc->storage[_key];
+		return {};
+	}
+
+	evmc_storage_status set_storage(
+		evmc_address const& _addr,
+		evmc_bytes32 const& _key,
+		evmc_bytes32 const& _value
+	) noexcept;
+
+	evmc_uint256be get_balance(evmc_address const& _addr) noexcept final
+	{
+		if (Account const* acc = account(_addr))
+			return acc->balance;
+		return {};
+	}
+
+	size_t get_code_size(evmc_address const& _addr) noexcept final
+	{
+		if (Account const* acc = account(_addr))
+			return acc->code.size();
+		return 0;
+	}
+
+	evmc_bytes32 get_code_hash(evmc_address const& _addr) noexcept final
+	{
+		if (Account const* acc = account(_addr))
+			return acc->codeHash;
+		return {};
+	}
+
+	size_t copy_code(
+		evmc_address const& _addr,
+		size_t _codeOffset,
+		uint8_t* _bufferData,
+		size_t _bufferSize
+	) noexcept final
+	{
+		size_t i = 0;
+		if (Account const* acc = account(_addr))
+			for (; i < _bufferSize && _codeOffset + i < acc->code.size(); i++)
+				_bufferData[i] = acc->code[_codeOffset + i];
+		return i;
+	}
+
+	void selfdestruct(evmc_address const& _addr, evmc_address const& _beneficiary) noexcept;
+
+	evmc::result call(evmc_message const& _message) noexcept;
+
+	evmc_tx_context get_tx_context() noexcept;
+
+	evmc_bytes32 get_block_hash(int64_t number) noexcept;
+
+	void emit_log(
+		evmc_address const& _addr,
+		uint8_t const* _data,
+		size_t _dataSize,
+		evmc_bytes32 const _topics[],
+		size_t _topicsCount
+	) noexcept;
+
+	evmc_revision getRevision()
+	{
+		return m_evmVersion;
+	}
+
+	static Address convertFromEVMC(evmc_address const& _addr);
+	static evmc_address convertToEVMC(Address const& _addr);
+	static h256 convertFromEVMC(evmc_bytes32 const& _data);
+	static evmc_bytes32 convertToEVMC(h256 const& _data);
+
+
+	State m_state;
+	evmc_address m_currentAddress = {};
+	evmc_address m_coinbase = convertToEVMC(Address("0x7878787878787878787878787878787878787878"));
+
+private:
+	evmc::result precompileSha256(evmc_message const& _message) noexcept;
+
+	evmc::vm& m_vm;
+	evmc_revision m_evmVersion;
+};
+
+
+}
+}

test/ExecutionFramework.cpp

@@ -27,6 +27,10 @@
 #include <boost/test/framework.hpp>
 #include <boost/algorithm/string/replace.hpp>
 
+#include <test/evmc/evmc.hpp>
+#include <test/evmc/loader.h>
+#include <test/evmc/helpers.hpp>
+
 #include <cstdlib>
 
 #include <chrono>

test/evmc/CMakeLists.txt

@@ -0,0 +1,23 @@
+# EVMC: Ethereum Client-VM Connector API.
+# Copyright 2016-2019 The EVMC Authors.
+# Licensed under the Apache License, Version 2.0.
+
+
+add_library(evmc_loader STATIC loader.h loader.c)
+set_target_properties(evmc_loader PROPERTIES LINKER_LANGUAGE C)
+target_link_libraries(evmc_loader INTERFACE ${CMAKE_DL_LIBS})
+target_include_directories(evmc_loader PUBLIC ${PROJECT_SOURCE_DIR}/test/)
+set_target_properties(evmc_loader PROPERTIES
+    POSITION_INDEPENDENT_CODE TRUE
+)
+
+add_library(evmc INTERFACE)
+target_sources(evmc INTERFACE
+    ${PROJECT_SOURCE_DIR}/test/evmc/evmc.h
+    ${PROJECT_SOURCE_DIR}/test/evmc/evmc.hpp
+    ${PROJECT_SOURCE_DIR}/test/evmc/helpers.h
+    ${PROJECT_SOURCE_DIR}/test/evmc/helpers.hpp
+    ${PROJECT_SOURCE_DIR}/test/evmc/utils.h
+)
+target_include_directories(evmc INTERFACE ${PROJECT_SOURCE_DIR}/test/)
+target_link_libraries(evmc INTERFACE evmc_loader)

test/evmc/LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
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+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
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test/evmc/evmc.hpp

@@ -0,0 +1,365 @@
+/* EVMC: Ethereum Client-VM Connector API.
+ * Copyright 2018-2019 The EVMC Authors.
+ * Licensed under the Apache License, Version 2.0.
+ */
+#pragma once
+
+#include <evmc/evmc.h>
+#include <evmc/helpers.h>
+
+#include <initializer_list>
+#include <utility>
+
+/// EVMC C++ API - wrappers and bindings for C++
+/// @ingroup cpp
+namespace evmc
+{
+/// @copydoc evmc_result
+///
+/// This is a RAII wrapper for evmc_result and objects of this type
+/// automatically release attached resources.
+class result : private evmc_result
+{
+public:
+    using evmc_result::create_address;
+    using evmc_result::gas_left;
+    using evmc_result::output_data;
+    using evmc_result::output_size;
+    using evmc_result::status_code;
+
+    /// Converting constructor from raw evmc_result.
+    explicit result(evmc_result const& res) noexcept : evmc_result{res} {}
+
+    /// Destructor responsible for automatically releasing attached resources.
+    ~result() noexcept
+    {
+        if (release)
+            release(this);
+    }
+
+    /// Move constructor.
+    result(result&& other) noexcept : evmc_result{other}
+    {
+        other.release = nullptr;  // Disable releasing of the rvalue object.
+    }
+
+    /// Move assignment operator.
+    ///
+    /// The self-assigment MUST never happen.
+    ///
+    /// @param other The other result object.
+    /// @return      The reference to the left-hand side object.
+    result& operator=(result&& other) noexcept
+    {
+        this->~result();                           // Release this object.
+        static_cast<evmc_result&>(*this) = other;  // Copy data.
+        other.release = nullptr;                   // Disable releasing of the rvalue object.
+        return *this;
+    }
+
+    /// Releases the ownership and returns the raw copy of evmc_result.
+    ///
+    /// This method drops the ownership of the result
+    /// (result's resources are not going to be released when this object is destructed).
+    /// It is the caller's responsibility having the returned copy of the result to release it.
+    /// This object MUST NOT be used after this method is invoked.
+    ///
+    /// @return  The copy of this object converted to raw evmc_result.
+    evmc_result release_raw() noexcept
+    {
+        const auto out = evmc_result{*this};  // Copy data.
+        this->release = nullptr;              // Disable releasing of this object.
+        return out;
+    }
+};
+
+/// @copybrief evmc_instance
+///
+/// This is a RAII wrapper for evmc_instance and objects of this type
+/// automatically destroys the VM instance.
+class vm
+{
+public:
+    /// Converting constructor from evmc_instance.
+    explicit vm(evmc_instance* instance) noexcept : m_instance{instance} {}
+
+    /// Destructor responsible for automatically destroying the VM instance.
+    ~vm() noexcept { m_instance->destroy(m_instance); }
+
+    /// The constructor that captures a VM instance and configures the instance
+    /// with provided list of options.
+    vm(evmc_instance* instance,
+       std::initializer_list<std::pair<const char*, const char*>> options) noexcept
+      : m_instance{instance}
+    {
+        for (auto option : options)
+            set_option(option.first, option.second);
+    }
+
+    /// 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_instance::name
+    char const* name() const noexcept { return m_instance->name; }
+
+    /// @copydoc evmc_instance::version
+    char const* version() const noexcept { return m_instance->version; }
+
+    /// @copydoc evmc::instance::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(evmc_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, &ctx, rev, &msg, code, code_size)};
+    }
+
+private:
+    evmc_instance* const m_instance = nullptr;
+};
+
+/// The EVMC Host interface
+class HostInterface
+{
+public:
+    virtual ~HostInterface() noexcept = default;
+
+    /// @copydoc evmc_host_interface::account_exists
+    virtual bool account_exists(const evmc_address& addr) noexcept = 0;
+
+    /// @copydoc evmc_host_interface::get_storage
+    virtual evmc_bytes32 get_storage(const evmc_address& addr,
+                                     const evmc_bytes32& key) noexcept = 0;
+
+    /// @copydoc evmc_host_interface::set_storage
+    virtual evmc_storage_status set_storage(const evmc_address& addr,
+                                            const evmc_bytes32& key,
+                                            const evmc_bytes32& value) noexcept = 0;
+
+    /// @copydoc evmc_host_interface::get_balance
+    virtual evmc_uint256be get_balance(const evmc_address& addr) noexcept = 0;
+
+    /// @copydoc evmc_host_interface::get_code_size
+    virtual size_t get_code_size(const evmc_address& addr) noexcept = 0;
+
+    /// @copydoc evmc_host_interface::get_code_hash
+    virtual evmc_bytes32 get_code_hash(const evmc_address& addr) noexcept = 0;
+
+    /// @copydoc evmc_host_interface::copy_code
+    virtual size_t copy_code(const evmc_address& addr,
+                             size_t code_offset,
+                             uint8_t* buffer_data,
+                             size_t buffer_size) noexcept = 0;
+
+    /// @copydoc evmc_host_interface::selfdestruct
+    virtual void selfdestruct(const evmc_address& addr,
+                              const evmc_address& beneficiary) noexcept = 0;
+
+    /// @copydoc evmc_host_interface::call
+    virtual result call(const evmc_message& msg) noexcept = 0;
+
+    /// @copydoc evmc_host_interface::get_tx_context
+    virtual evmc_tx_context get_tx_context() noexcept = 0;
+
+    /// @copydoc evmc_host_interface::get_block_hash
+    virtual evmc_bytes32 get_block_hash(int64_t block_number) noexcept = 0;
+
+    /// @copydoc evmc_host_interface::emit_log
+    virtual void emit_log(const evmc_address& addr,
+                          const uint8_t* data,
+                          size_t data_size,
+                          const evmc_bytes32 topics[],
+                          size_t num_topics) noexcept = 0;
+};
+
+
+/// Wrapper around EVMC host context / host interface.
+///
+/// To be used by VM implementations as better alternative to using ::evmc_context directly.
+class HostContext : public HostInterface
+{
+    evmc_context* context = nullptr;
+    evmc_tx_context tx_context = {};
+
+public:
+    /// Implicit converting constructor from evmc_context.
+    HostContext(evmc_context* ctx) noexcept : context{ctx} {}  // NOLINT
+
+    bool account_exists(const evmc_address& address) noexcept final
+    {
+        return context->host->account_exists(context, &address);
+    }
+
+    evmc_bytes32 get_storage(const evmc_address& address, const evmc_bytes32& key) noexcept final
+    {
+        return context->host->get_storage(context, &address, &key);
+    }
+
+    evmc_storage_status set_storage(const evmc_address& address,
+                                    const evmc_bytes32& key,
+                                    const evmc_bytes32& value) noexcept final
+    {
+        return context->host->set_storage(context, &address, &key, &value);
+    }
+
+    evmc_uint256be get_balance(const evmc_address& address) noexcept final
+    {
+        return context->host->get_balance(context, &address);
+    }
+
+    size_t get_code_size(const evmc_address& address) noexcept final
+    {
+        return context->host->get_code_size(context, &address);
+    }
+
+    evmc_bytes32 get_code_hash(const evmc_address& address) noexcept final
+    {
+        return context->host->get_code_hash(context, &address);
+    }
+
+    size_t copy_code(const evmc_address& address,
+                     size_t code_offset,
+                     uint8_t* buffer_data,
+                     size_t buffer_size) noexcept final
+    {
+        return context->host->copy_code(context, &address, code_offset, buffer_data, buffer_size);
+    }
+
+    void selfdestruct(const evmc_address& address, const evmc_address& beneficiary) noexcept final
+    {
+        context->host->selfdestruct(context, &address, &beneficiary);
+    }
+
+    result call(const evmc_message& message) noexcept final
+    {
+        return result{context->host->call(context, &message)};
+    }
+
+    /// @copydoc HostInterface::get_tx_context()
+    ///
+    /// The implementation caches the received transaction context
+    /// by assuming that the block timestamp should never be zero.
+    ///
+    /// @return The cached transaction context.
+    evmc_tx_context get_tx_context() noexcept final
+    {
+        if (tx_context.block_timestamp == 0)
+            tx_context = context->host->get_tx_context(context);
+        return tx_context;
+    }
+
+    evmc_bytes32 get_block_hash(int64_t number) noexcept final
+    {
+        return context->host->get_block_hash(context, number);
+    }
+
+    void emit_log(const evmc_address& address,
+                  const uint8_t* data,
+                  size_t data_size,
+                  const evmc_bytes32 topics[],
+                  size_t topics_count) noexcept final
+    {
+        context->host->emit_log(context, &address, data, data_size, topics, topics_count);
+    }
+};
+
+/// Abstract class to be used by Host implementations.
+///
+/// When implementing EVMC Host, you can directly inherit from the evmc::Host class.
+/// This way your implementation will be simpler by avoiding manual handling
+/// of the ::evmc_context and the ::evmc_context::host.
+class Host : public HostInterface, public evmc_context
+{
+public:
+    inline Host() noexcept;
+};
+
+namespace internal
+{
+inline bool account_exists(evmc_context* h, const evmc_address* addr) noexcept
+{
+    return static_cast<Host*>(h)->account_exists(*addr);
+}
+inline evmc_bytes32 get_storage(evmc_context* h,
+                                const evmc_address* addr,
+                                const evmc_bytes32* key) noexcept
+{
+    return static_cast<Host*>(h)->get_storage(*addr, *key);
+}
+inline evmc_storage_status set_storage(evmc_context* h,
+                                       const evmc_address* addr,
+                                       const evmc_bytes32* key,
+                                       const evmc_bytes32* value) noexcept
+{
+    return static_cast<Host*>(h)->set_storage(*addr, *key, *value);
+}
+inline evmc_uint256be get_balance(evmc_context* h, const evmc_address* addr) noexcept
+{
+    return static_cast<Host*>(h)->get_balance(*addr);
+}
+inline size_t get_code_size(evmc_context* h, const evmc_address* addr) noexcept
+{
+    return static_cast<Host*>(h)->get_code_size(*addr);
+}
+inline evmc_bytes32 get_code_hash(evmc_context* h, const evmc_address* addr) noexcept
+{
+    return static_cast<Host*>(h)->get_code_hash(*addr);
+}
+inline size_t copy_code(evmc_context* h,
+                        const evmc_address* addr,
+                        size_t code_offset,
+                        uint8_t* buffer_data,
+                        size_t buffer_size) noexcept
+{
+    return static_cast<Host*>(h)->copy_code(*addr, code_offset, buffer_data, buffer_size);
+}
+inline void selfdestruct(evmc_context* h,
+                         const evmc_address* addr,
+                         const evmc_address* beneficiary) noexcept
+{
+    static_cast<Host*>(h)->selfdestruct(*addr, *beneficiary);
+}
+inline evmc_result call(evmc_context* h, const evmc_message* msg) noexcept
+{
+    return static_cast<Host*>(h)->call(*msg).release_raw();
+}
+inline evmc_tx_context get_tx_context(evmc_context* h) noexcept
+{
+    return static_cast<Host*>(h)->get_tx_context();
+}
+inline evmc_bytes32 get_block_hash(evmc_context* h, int64_t block_number) noexcept
+{
+    return static_cast<Host*>(h)->get_block_hash(block_number);
+}
+inline void emit_log(evmc_context* h,
+                     const evmc_address* addr,
+                     const uint8_t* data,
+                     size_t data_size,
+                     const evmc_bytes32 topics[],
+                     size_t num_topics) noexcept
+{
+    static_cast<Host*>(h)->emit_log(*addr, data, data_size, topics, num_topics);
+}
+
+constexpr evmc_host_interface interface{
+    account_exists, get_storage,  set_storage, get_balance,    get_code_size,  get_code_hash,
+    copy_code,      selfdestruct, call,        get_tx_context, get_block_hash, emit_log,
+};
+}  // namespace internal
+
+inline Host::Host() noexcept : evmc_context{&internal::interface} {}
+
+}  // namespace evmc

test/evmc/helpers.h

@@ -0,0 +1,171 @@
+/* EVMC: Ethereum Client-VM Connector API.
+ * Copyright 2018-2019 The EVMC Authors.
+ * Licensed under the Apache License, Version 2.0.
+ */
+
+/**
+ * EVMC Helpers
+ *
+ * A collection of C helper functions for invoking a VM instance methods.
+ * These are convenient for languages where invoking function pointers
+ * is "ugly" or impossible (such as Go).
+ *
+ * It also contains helpers (overloaded operators) for using EVMC types effectively in C++.
+ *
+ * @defgroup helpers EVMC Helpers
+ * @{
+ */
+#pragma once
+
+#include <evmc/evmc.h>
+
+/**
+ * Returns true if the VM instance has a compatible ABI version.
+ */
+static inline int evmc_is_abi_compatible(struct evmc_instance* instance)
+{
+    return instance->abi_version == EVMC_ABI_VERSION;
+}
+
+/**
+ * Returns the name of the VM instance.
+ */
+static inline const char* evmc_vm_name(struct evmc_instance* instance)
+{
+    return instance->name;
+}
+
+/**
+ * Returns the version of the VM instance.
+ */
+static inline const char* evmc_vm_version(struct evmc_instance* instance)
+{
+    return instance->version;
+}
+
+/**
+ * Checks if the VM instance has the given capability.
+ *
+ * @see evmc_get_capabilities_fn
+ */
+static inline bool evmc_vm_has_capability(struct evmc_instance* vm,
+                                          enum evmc_capabilities capability)
+{
+    return (vm->get_capabilities(vm) & (evmc_capabilities_flagset)capability) != 0;
+}
+
+/**
+ * Destroys the VM instance.
+ *
+ * @see evmc_destroy_fn
+ */
+static inline void evmc_destroy(struct evmc_instance* instance)
+{
+    instance->destroy(instance);
+}
+
+/**
+ * Sets the option for the VM instance, if the feature is supported by the VM.
+ *
+ * @see evmc_set_option_fn
+ */
+static inline enum evmc_set_option_result evmc_set_option(struct evmc_instance* instance,
+                                                          char const* name,
+                                                          char const* value)
+{
+    if (instance->set_option)
+        return instance->set_option(instance, name, value);
+    return EVMC_SET_OPTION_INVALID_NAME;
+}
+
+/**
+ * Sets the tracer callback for the VM instance, if the feature is supported by the VM.
+ *
+ * @see evmc_set_tracer_fn
+ */
+static inline void evmc_set_tracer(struct evmc_instance* instance,
+                                   evmc_trace_callback callback,
+                                   struct evmc_tracer_context* context)
+{
+    if (instance->set_tracer)
+        instance->set_tracer(instance, callback, context);
+}
+
+/**
+ * Executes code in the VM instance.
+ *
+ * @see evmc_execute_fn.
+ */
+static inline struct evmc_result evmc_execute(struct evmc_instance* instance,
+                                              struct evmc_context* context,
+                                              enum evmc_revision rev,
+                                              const struct evmc_message* msg,
+                                              uint8_t const* code,
+                                              size_t code_size)
+{
+    return instance->execute(instance, context, rev, msg, code, code_size);
+}
+
+/**
+ * Releases the resources allocated to the execution result.
+ *
+ * @param result  The result object to be released. MUST NOT be NULL.
+ *
+ * @see evmc_result::release() evmc_release_result_fn
+ */
+static inline void evmc_release_result(struct evmc_result* result)
+{
+    if (result->release)
+        result->release(result);
+}
+
+
+/**
+ * Helpers for optional storage of evmc_result.
+ *
+ * In some contexts (i.e. evmc_result::create_address is unused) objects of
+ * type evmc_result contains a memory storage that MAY be used by the object
+ * owner. This group defines helper types and functions for accessing
+ * the optional storage.
+ *
+ * @defgroup result_optional_storage Result Optional Storage
+ * @{
+ */
+
+/**
+ * The union representing evmc_result "optional storage".
+ *
+ * The evmc_result struct contains 24 bytes of optional storage that can be
+ * reused by the object creator if the object does not contain
+ * evmc_result::create_address.
+ *
+ * A VM implementation MAY use this memory to keep additional data
+ * when returning result from evmc_execute_fn().
+ * The host application MAY use this memory to keep additional data
+ * when returning result of performed calls from evmc_call_fn().
+ *
+ * @see evmc_get_optional_storage(), evmc_get_const_optional_storage().
+ */
+union evmc_result_optional_storage
+{
+    uint8_t bytes[24]; /**< 24 bytes of optional storage. */
+    void* pointer;     /**< Optional pointer. */
+};
+
+/** Provides read-write access to evmc_result "optional storage". */
+static inline union evmc_result_optional_storage* evmc_get_optional_storage(
+    struct evmc_result* result)
+{
+    return (union evmc_result_optional_storage*)&result->create_address;
+}
+
+/** Provides read-only access to evmc_result "optional storage". */
+static inline const union evmc_result_optional_storage* evmc_get_const_optional_storage(
+    const struct evmc_result* result)
+{
+    return (const union evmc_result_optional_storage*)&result->create_address;
+}
+
+/** @} */
+
+/** @} */

test/evmc/helpers.hpp

@@ -0,0 +1,98 @@
+/* EVMC: Ethereum Client-VM Connector API.
+ * Copyright 2018-2019 The EVMC Authors.
+ * Licensed under the Apache License, Version 2.0.
+ */
+
+/**
+ * @file
+ * A collection of helpers (overloaded operators) for using EVMC types effectively in C++.
+ *
+ * @addtogroup helpers
+ * @{
+ */
+#pragma once
+
+#include <evmc/evmc.h>
+
+#include <cstring>
+#include <functional>
+
+/// The comparator for std::map<evmc_address, ...>.
+inline bool operator<(const evmc_address& a, const evmc_address& b)
+{
+    return std::memcmp(a.bytes, b.bytes, sizeof(a.bytes)) < 0;
+}
+
+/// The comparator for std::map<evmc_bytes32, ...>.
+inline bool operator<(const evmc_bytes32& a, const evmc_bytes32& b)
+{
+    return std::memcmp(a.bytes, b.bytes, sizeof(a.bytes)) < 0;
+}
+
+/// The comparator for equality.
+inline bool operator==(const evmc_address& a, const evmc_address& b)
+{
+    return std::memcmp(a.bytes, b.bytes, sizeof(a.bytes)) == 0;
+}
+
+/// The comparator for equality.
+inline bool operator==(const evmc_bytes32& a, const evmc_bytes32& b)
+{
+    return std::memcmp(a.bytes, b.bytes, sizeof(a.bytes)) == 0;
+}
+
+/// Check if the address is zero (all bytes are zeros).
+inline bool is_zero(const evmc_address& address) noexcept
+{
+    return address == evmc_address{};
+}
+
+/// Check if the hash is zero (all bytes are zeros).
+inline bool is_zero(const evmc_bytes32& x) noexcept
+{
+    return x == evmc_bytes32{};
+}
+
+/// FNV1a hash function with 64-bit result.
+inline uint64_t fnv1a_64(const uint8_t* ptr, size_t len)
+{
+    constexpr uint64_t prime = 1099511628211ULL;
+    constexpr uint64_t offset_basis = 14695981039346656037ULL;
+
+    uint64_t ret = offset_basis;
+    for (size_t i = 0; i < len; i++)
+    {
+        ret ^= ptr[i];
+        ret *= prime;
+    }
+    return ret;
+}
+
+namespace std
+{
+/// Hash operator template specialization for evmc_address needed for unordered containers.
+template <>
+struct hash<evmc_address>
+{
+    /// Hash operator using FNV1a.
+    std::enable_if<sizeof(size_t) == 8, std::size_t>::type operator()(const evmc_address& s) const
+        noexcept
+    {
+        return fnv1a_64(s.bytes, sizeof(s.bytes));
+    }
+};
+
+/// Hash operator template needed for std::unordered_set and others using hashes.
+template <>
+struct hash<evmc_bytes32>
+{
+    /// Hash operator using FNV1a.
+    std::enable_if<sizeof(size_t) == 8, std::size_t>::type operator()(const evmc_bytes32& s) const
+        noexcept
+    {
+        return fnv1a_64(s.bytes, sizeof(s.bytes));
+    }
+};
+}  // namespace std
+
+/** @} */

test/evmc/loader.c

@@ -0,0 +1,240 @@
+/* EVMC: Ethereum Client-VM Connector API.
+ * Copyright 2018-2019 The EVMC Authors.
+ * Licensed under the Apache License, Version 2.0.
+ */
+
+#include <evmc/loader.h>
+
+#include <evmc/evmc.h>
+#include <evmc/helpers.h>
+
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#if defined(EVMC_LOADER_MOCK)
+#include "../../test/unittests/loader_mock.h"
+#elif _WIN32
+#include <Windows.h>
+#define DLL_HANDLE HMODULE
+#define DLL_OPEN(filename) LoadLibrary(filename)
+#define DLL_CLOSE(handle) FreeLibrary(handle)
+#define DLL_GET_CREATE_FN(handle, name) (evmc_create_fn)(uintptr_t) GetProcAddress(handle, name)
+#define DLL_GET_ERROR_MSG() NULL
+#else
+#include <dlfcn.h>
+#define DLL_HANDLE void*
+#define DLL_OPEN(filename) dlopen(filename, RTLD_LAZY)
+#define DLL_CLOSE(handle) dlclose(handle)
+#define DLL_GET_CREATE_FN(handle, name) (evmc_create_fn)(uintptr_t) dlsym(handle, name)
+#define DLL_GET_ERROR_MSG() dlerror()
+#endif
+
+#ifdef __has_attribute
+#if __has_attribute(format)
+#define ATTR_FORMAT(archetype, string_index, first_to_check) \
+    __attribute__((format(archetype, string_index, first_to_check)))
+#endif
+#endif
+
+#ifndef ATTR_FORMAT
+#define ATTR_FORMAT(...)
+#endif
+
+#if _WIN32
+#define strcpy_sx strcpy_s
+#else
+/*
+ * Limited variant of strcpy_s().
+ *
+ * Provided for C standard libraries where strcpy_s() is not available.
+ * The availability check might need to adjusted for other C standard library implementations.
+ */
+#if !defined(EVMC_LOADER_MOCK)
+static
+#endif
+    int
+    strcpy_sx(char* restrict dest, size_t destsz, const char* restrict src)
+{
+    size_t len = strlen(src);
+    if (len >= destsz)
+    {
+        // The input src will not fit into the dest buffer.
+        // Set the first byte of the dest to null to make it effectively empty string
+        // and return error.
+        dest[0] = 0;
+        return 1;
+    }
+    memcpy(dest, src, len);
+    dest[len] = 0;
+    return 0;
+}
+#endif
+
+#define PATH_MAX_LENGTH 4096
+
+static const char* last_error_msg = NULL;
+
+#define LAST_ERROR_MSG_BUFFER_SIZE 511
+
+// Buffer for formatted error messages.
+// It has one null byte extra to avoid buffer read overflow during concurrent access.
+static char last_error_msg_buffer[LAST_ERROR_MSG_BUFFER_SIZE + 1];
+
+ATTR_FORMAT(printf, 2, 3)
+static enum evmc_loader_error_code set_error(enum evmc_loader_error_code error_code,
+                                             const char* format,
+                                             ...)
+{
+    va_list args;
+    va_start(args, format);
+    if (vsnprintf(last_error_msg_buffer, LAST_ERROR_MSG_BUFFER_SIZE, format, args) <
+        LAST_ERROR_MSG_BUFFER_SIZE)
+        last_error_msg = last_error_msg_buffer;
+    va_end(args);
+    return error_code;
+}
+
+
+evmc_create_fn evmc_load(const char* filename, enum evmc_loader_error_code* error_code)
+{
+    last_error_msg = NULL;  // Reset last error.
+    enum evmc_loader_error_code ec = EVMC_LOADER_SUCCESS;
+    evmc_create_fn create_fn = NULL;
+
+    if (!filename)
+    {
+        ec = set_error(EVMC_LOADER_INVALID_ARGUMENT, "invalid argument: file name cannot be null");
+        goto exit;
+    }
+
+    const size_t length = strlen(filename);
+    if (length == 0)
+    {
+        ec = set_error(EVMC_LOADER_INVALID_ARGUMENT, "invalid argument: file name cannot be empty");
+        goto exit;
+    }
+    else if (length > PATH_MAX_LENGTH)
+    {
+        ec = set_error(EVMC_LOADER_INVALID_ARGUMENT,
+                       "invalid argument: file name is too long (%d, maximum allowed length is %d)",
+                       (int)length, PATH_MAX_LENGTH);
+        goto exit;
+    }
+
+    DLL_HANDLE handle = DLL_OPEN(filename);
+    if (!handle)
+    {
+        // Get error message if available.
+        last_error_msg = DLL_GET_ERROR_MSG();
+        if (last_error_msg)
+            ec = EVMC_LOADER_CANNOT_OPEN;
+        else
+            ec = set_error(EVMC_LOADER_CANNOT_OPEN, "cannot open %s", filename);
+        goto exit;
+    }
+
+    // Create name buffer with the prefix.
+    const char prefix[] = "evmc_create_";
+    const size_t prefix_length = strlen(prefix);
+    char prefixed_name[sizeof(prefix) + PATH_MAX_LENGTH];
+    strcpy_sx(prefixed_name, sizeof(prefixed_name), prefix);
+
+    // Find filename in the path.
+    const char* sep_pos = strrchr(filename, '/');
+#if _WIN32
+    // On Windows check also Windows classic path separator.
+    const char* sep_pos_windows = strrchr(filename, '\\');
+    sep_pos = sep_pos_windows > sep_pos ? sep_pos_windows : sep_pos;
+#endif
+    const char* name_pos = sep_pos ? sep_pos + 1 : filename;
+
+    // Skip "lib" prefix if present.
+    const char lib_prefix[] = "lib";
+    const size_t lib_prefix_length = strlen(lib_prefix);
+    if (strncmp(name_pos, lib_prefix, lib_prefix_length) == 0)
+        name_pos += lib_prefix_length;
+
+    char* base_name = prefixed_name + prefix_length;
+    strcpy_sx(base_name, PATH_MAX_LENGTH, name_pos);
+
+    // Trim the file extension.
+    char* ext_pos = strrchr(prefixed_name, '.');
+    if (ext_pos)
+        *ext_pos = 0;
+
+    // Replace all "-" with "_".
+    char* dash_pos = base_name;
+    while ((dash_pos = strchr(dash_pos, '-')) != NULL)
+        *dash_pos++ = '_';
+
+    // Search for the built function name.
+    while ((create_fn = DLL_GET_CREATE_FN(handle, prefixed_name)) == NULL)
+    {
+        // Shorten the base name by skipping the `word_` segment.
+        const char* shorter_name_pos = strchr(base_name, '_');
+        if (!shorter_name_pos)
+            break;
+
+        memmove(base_name, shorter_name_pos + 1, strlen(shorter_name_pos) + 1);
+    }
+
+    if (!create_fn)
+        create_fn = DLL_GET_CREATE_FN(handle, "evmc_create");
+
+    if (!create_fn)
+    {
+        DLL_CLOSE(handle);
+        ec = set_error(EVMC_LOADER_SYMBOL_NOT_FOUND, "EVMC create function not found in %s",
+                       filename);
+    }
+
+exit:
+    if (error_code)
+        *error_code = ec;
+    return create_fn;
+}
+
+const char* evmc_last_error_msg()
+{
+    const char* m = last_error_msg;
+    last_error_msg = NULL;
+    return m;
+}
+
+struct evmc_instance* evmc_load_and_create(const char* filename,
+                                           enum evmc_loader_error_code* error_code)
+{
+    // First load the DLL. This also resets the last_error_msg;
+    evmc_create_fn create_fn = evmc_load(filename, error_code);
+
+    if (!create_fn)
+        return NULL;
+
+    enum evmc_loader_error_code ec = EVMC_LOADER_SUCCESS;
+
+    struct evmc_instance* instance = create_fn();
+    if (!instance)
+    {
+        ec = set_error(EVMC_LOADER_INSTANCE_CREATION_FAILURE,
+                       "creating EVMC instance of %s has failed", filename);
+        goto exit;
+    }
+
+    if (!evmc_is_abi_compatible(instance))
+    {
+        ec = set_error(EVMC_LOADER_ABI_VERSION_MISMATCH,
+                       "EVMC ABI version %d of %s mismatches the expected version %d",
+                       instance->abi_version, filename, EVMC_ABI_VERSION);
+        evmc_destroy(instance);
+        instance = NULL;
+        goto exit;
+    }
+
+exit:
+    if (error_code)
+        *error_code = ec;
+
+    return instance;
+}

test/evmc/loader.h

@@ -0,0 +1,133 @@
+/* EVMC: Ethereum Client-VM Connector API.
+ * Copyright 2018-2019 The EVMC Authors.
+ * Licensed under the Apache License, Version 2.0.
+ */
+
+/**
+ * EVMC Loader Library
+ *
+ * The EVMC Loader Library supports loading VMs implemented as Dynamically Loaded Libraries
+ * (DLLs, shared objects).
+ *
+ * @defgroup loader EVMC Loader
+ * @{
+ */
+#pragma once
+
+#if __cplusplus
+extern "C" {
+#endif
+
+/** The function pointer type for EVMC create functions. */
+typedef struct evmc_instance* (*evmc_create_fn)(void);
+
+/** Error codes for the EVMC loader. */
+enum evmc_loader_error_code
+{
+    /** The loader succeeded. */
+    EVMC_LOADER_SUCCESS = 0,
+
+    /** The loader cannot open the given file name. */
+    EVMC_LOADER_CANNOT_OPEN = 1,
+
+    /** The VM create function not found. */
+    EVMC_LOADER_SYMBOL_NOT_FOUND = 2,
+
+    /** The invalid argument value provided. */
+    EVMC_LOADER_INVALID_ARGUMENT = 3,
+
+    /** The creation of a VM instance has failed. */
+    EVMC_LOADER_INSTANCE_CREATION_FAILURE = 4,
+
+    /** The ABI version of the VM instance has mismatched. */
+    EVMC_LOADER_ABI_VERSION_MISMATCH = 5
+};
+
+/**
+ * Dynamically loads the EVMC module with a VM implementation.
+ *
+ * This function tries to open a dynamically loaded library (DLL) at the given `filename`.
+ * On UNIX-like systems dlopen() function is used. On Windows LoadLibrary() function is used.
+ *
+ * If the file does not exist or is not a valid shared library the ::EVMC_LOADER_CANNOT_OPEN error
+ * code is signaled and NULL is returned.
+ *
+ * After the DLL is successfully loaded the function tries to find the EVM create function in the
+ * library. The `filename` is used to guess the EVM name and the name of the create function.
+ * The create function name is constructed by the following rules. Consider example path:
+ * "/ethereum/libexample-interpreter.so".
+ * - the filename is taken from the path:
+ *   "libexample-interpreter.so",
+ * - the "lib" prefix and file extension are stripped from the name:
+ *   "example-interpreter"
+ * - all "-" are replaced with "_" to construct _base name_:
+ *   "example_interpreter",
+ * - the function name "evmc_create_" + _base name_ is searched in the library:
+ *   "evmc_create_example_interpreter",
+ * - if function not found, the _base name_ is shorten by skipping the first word separated by "_":
+ *   "interpreter",
+ * - then, the function of the shorter name "evmc_create_" + _base name_ is searched in the library:
+ *   "evmc_create_interpreter",
+ * - the name shortening continues until a function is found or the name cannot be shorten more,
+ * - lastly, when no function found, the function name "evmc_create" is searched in the library.
+ *
+ * If the create function is found in the library, the pointer to the function is returned.
+ * Otherwise, the ::EVMC_LOADER_SYMBOL_NOT_FOUND error code is signaled and NULL is returned.
+ *
+ * It is safe to call this function with the same filename argument multiple times
+ * (the DLL is not going to be loaded multiple times).
+ *
+ * @param filename    The null terminated path (absolute or relative) to an EVMC module
+ *                    (dynamically loaded library) containing the VM implementation.
+ *                    If the value is NULL, an empty C-string or longer than the path maximum length
+ *                    the ::EVMC_LOADER_INVALID_ARGUMENT is signaled.
+ * @param error_code  The pointer to the error code. If not NULL the value is set to
+ *                    ::EVMC_LOADER_SUCCESS on success or any other error code as described above.
+ * @return            The pointer to the EVM create function or NULL in case of error.
+ */
+evmc_create_fn evmc_load(const char* filename, enum evmc_loader_error_code* error_code);
+
+/**
+ * Dynamically loads the EVMC module and creates the VM instance.
+ *
+ * This is a macro for creating the VM instance with the function returned from evmc_load().
+ * The function signals the same errors as evmc_load() and additionally:
+ * - ::EVMC_LOADER_INSTANCE_CREATION_FAILURE when the create function returns NULL,
+ * - ::EVMC_LOADER_ABI_VERSION_MISMATCH when the created VM instance has ABI version different
+ *   from the ABI version of this library (::EVMC_ABI_VERSION).
+ *
+ * It is safe to call this function with the same filename argument multiple times:
+ * the DLL is not going to be loaded multiple times, but the function will return new VM instance
+ * each time.
+ *
+ * @param filename    The null terminated path (absolute or relative) to an EVMC module
+ *                    (dynamically loaded library) containing the VM implementation.
+ *                    If the value is NULL, an empty C-string or longer than the path maximum length
+ *                    the ::EVMC_LOADER_INVALID_ARGUMENT is signaled.
+ * @param error_code  The pointer to the error code. If not NULL the value is set to
+ *                    ::EVMC_LOADER_SUCCESS on success or any other error code as described above.
+ * @return            The pointer to the created VM or NULL in case of error.
+ */
+struct evmc_instance* evmc_load_and_create(const char* filename,
+                                           enum evmc_loader_error_code* error_code);
+
+/**
+ * Returns the human-readable message describing the most recent error
+ * that occurred in EVMC loading since the last call to this function.
+ *
+ * In case any loading function returned ::EVMC_LOADER_SUCCESS this function always returns NULL.
+ * In case of error code other than success returned, this function MAY return the error message.
+ * Calling this function "consumes" the error message and the function will return NULL
+ * from subsequent invocations.
+ * This function is not thread-safe.
+ *
+ * @return Error message or NULL if no additional information is available.
+ *         The returned pointer MUST NOT be freed by the caller.
+ */
+const char* evmc_last_error_msg();
+
+#if __cplusplus
+}
+#endif
+
+/** @} */

test/evmc/utils.h

@@ -0,0 +1,36 @@
+/* EVMC: Ethereum Client-VM Connector API.
+ * Copyright 2018-2019 The EVMC Authors.
+ * Licensed under the Apache License, Version 2.0.
+ */
+
+#pragma once
+
+/**
+ * @file
+ * A collection of helper macros to handle some non-portable features of C/C++ compilers.
+ *
+ * @addtogroup helpers
+ * @{
+ */
+
+/**
+ * @def EVMC_EXPORT
+ * Marks a function to be exported from a shared library.
+ */
+#if defined _MSC_VER || defined __MINGW32__
+#define EVMC_EXPORT __declspec(dllexport)
+#else
+#define EVMC_EXPORT __attribute__((visibility("default")))
+#endif
+
+/**
+ * @def EVMC_NOEXCEPT
+ * Safe way of marking a function with `noexcept` C++ specifier.
+ */
+#if __cplusplus
+#define EVMC_NOEXCEPT noexcept
+#else
+#define EVMC_NOEXCEPT
+#endif
+
+/** @} */

test/tools/CMakeLists.txt

@@ -34,4 +34,4 @@ add_executable(isoltest
 	../libyul/YulOptimizerTest.cpp
 	../libyul/YulInterpreterTest.cpp
 )
-target_link_libraries(isoltest PRIVATE libsolc solidity yulInterpreter evmasm Boost::boost Boost::program_options Boost::unit_test_framework)
+target_link_libraries(isoltest PRIVATE evmc libsolc solidity yulInterpreter evmasm Boost::boost Boost::program_options Boost::unit_test_framework)

test/tools/ossfuzz/CMakeLists.txt

@@ -9,8 +9,11 @@ add_dependencies(ossfuzz
         )
 
 if (OSSFUZZ)
-add_custom_target(ossfuzz_proto)
+    add_custom_target(ossfuzz_proto)
-add_dependencies(ossfuzz_proto yul_proto_ossfuzz yul_proto_diff_ossfuzz)
+    add_dependencies(ossfuzz_proto yul_proto_ossfuzz yul_proto_diff_ossfuzz)
+
+    add_custom_target(ossfuzz_abiv2)
+    add_dependencies(ossfuzz_abiv2 abiv2_proto_ossfuzz)
 endif()
 
 if (OSSFUZZ)
@@ -49,6 +52,26 @@ if (OSSFUZZ)
             protobuf-mutator.a
             protobuf.a
             FuzzingEngine.a)
+
+    add_executable(abiv2_proto_ossfuzz
+            ../../EVMHost.cpp
+            abiV2ProtoFuzzer.cpp
+            abiV2FuzzerCommon.cpp
+            protoToAbiV2.cpp
+            abiV2Proto.pb.cc
+    )
+    target_include_directories(abiv2_proto_ossfuzz PRIVATE
+            /src/LPM/external.protobuf/include
+            /src/libprotobuf-mutator
+            /src/evmone/include
+    )
+    target_link_libraries(abiv2_proto_ossfuzz PRIVATE solidity
+            evmone intx ethash keccak evmc-instructions evmc
+            protobuf-mutator-libfuzzer.a
+            protobuf-mutator.a
+            protobuf.a
+            FuzzingEngine.a
+    )
 else()
     add_library(solc_opt_ossfuzz
             solc_opt_ossfuzz.cpp
@@ -99,4 +122,23 @@ else()
 #            protobuf-mutator.a
 #            protobuf.a
 #            FuzzingEngine.a)
+#    add_executable(abiv2_proto_ossfuzz
+#            ../../EVMHost.cpp
+#            abiV2ProtoFuzzer.cpp
+#            abiV2FuzzerCommon.cpp
+#            protoToAbiV2.cpp
+#            abiV2Proto.pb.cc
+#    )
+#    target_include_directories(abiv2_proto_ossfuzz PRIVATE
+#            /src/LPM/external.protobuf/include
+#            /src/libprotobuf-mutator
+#            /src/evmone/include
+#    )
+#    target_link_libraries(abiv2_proto_ossfuzz PRIVATE solidity
+#            evmone intx ethash keccak evmc-instructions evmc
+#            protobuf-mutator-libfuzzer.a
+#            protobuf-mutator.a
+#            protobuf.a
+#            FuzzingEngine.a
+#    )
 endif()

test/tools/ossfuzz/abiV2FuzzerCommon.cpp

@@ -27,7 +27,7 @@ dev::bytes SolidityCompilationFramework::compileContract(
 			);
 		std::cerr << "Compiling contract failed" << std::endl;
 	}
-	dev::eth::LinkerObject obj = m_compiler.runtimeObject(
+	dev::eth::LinkerObject obj = m_compiler.object(
 		_contractName.empty() ?
 		m_compiler.lastContractName() :
 		_contractName

test/tools/ossfuzz/abiV2FuzzerCommon.h

@@ -28,7 +28,7 @@ public:
 protected:
 	dev::solidity::CompilerStack m_compiler;
 	langutil::EVMVersion m_evmVersion;
-	dev::solidity::OptimiserSettings m_optimiserSettings = dev::solidity::OptimiserSettings::full();
+	dev::solidity::OptimiserSettings m_optimiserSettings = dev::solidity::OptimiserSettings::none();
 };
 }
 }

test/tools/ossfuzz/abiV2ProtoFuzzer.cpp

@@ -15,15 +15,86 @@
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <test/EVMHost.h>
 #include <test/tools/ossfuzz/abiV2FuzzerCommon.h>
 #include <test/tools/ossfuzz/protoToAbiV2.h>
+#include <evmone/evmone.h>
 #include <src/libfuzzer/libfuzzer_macro.h>
 #include <fstream>
 
+static evmc::vm evmone = evmc::vm{evmc_create_evmone()};
+
 using namespace dev::test::abiv2fuzzer;
+using namespace dev::test;
 using namespace dev;
 using namespace std;
 
+namespace
+{
+/// Test function returns a uint256 value
+static size_t const expectedOutputLength = 32;
+/// Expected output value is decimal 1000 or hex 03E8
+static uint8_t const expectedOutput[expectedOutputLength] = {
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, u'\x03', u'\xe8'
+};
+
+/// Compares the contents of the memory address pointed to
+/// by `_result` of `_length` bytes to the expected output.
+/// Returns true if `_result` matches expected output, false
+/// otherwise.
+bool isOutputExpected(uint8_t const* _result, size_t _length)
+{
+	if (_length != expectedOutputLength)
+		return false;
+
+	return (memcmp(_result, expectedOutput, expectedOutputLength) == 0);
+}
+
+/// Accepts a reference to a user-specified input and returns an
+/// evmc_message with all of its fields zero initialized except
+/// gas and input fields.
+/// The gas field is set to the maximum permissible value so that we
+/// don't run into out of gas errors. The input field is copied from
+/// user input.
+evmc_message initializeMessage(dev::bytes const& _input)
+{
+	// Zero initialize all message fields
+	evmc_message msg = {};
+	// Gas available (value of type int64_t) is set to its maximum
+	// value.
+	msg.gas = std::numeric_limits<int64_t>::max();
+	msg.input_data = _input.data();
+	msg.input_size = _input.size();
+	return msg;
+}
+
+/// Accepts host context implementation, and keccak256 hash of the function
+/// to be called at a specified address in the simulated blockchain as
+/// input and returns the result of the execution of the called function.
+evmc::result executeContract(
+	EVMHost& _hostContext,
+	dev::bytes const& _functionHash,
+	evmc_address _deployedAddress
+)
+{
+	evmc_message message = initializeMessage(_functionHash);
+	message.destination = _deployedAddress;
+	message.kind = EVMC_CALL;
+	return _hostContext.call(message);
+}
+
+/// Accepts a reference to host context implementation and byte code
+/// as input and deploys it on the simulated blockchain. Returns the
+/// result of deployment.
+evmc::result deployContract(EVMHost& _hostContext, dev::bytes const& _code)
+{
+	evmc_message message = initializeMessage(_code);
+	message.kind = EVMC_CREATE;
+	return _hostContext.call(message);
+}
+}
+
 DEFINE_PROTO_FUZZER(Contract const& _input)
 {
 	string contract_source = ProtoConverter{}.contractToString(_input);
@@ -44,17 +115,48 @@ DEFINE_PROTO_FUZZER(Contract const& _input)
 	{
 		// Compile contract generated by the proto fuzzer
 		SolidityCompilationFramework solCompilationFramework;
-		std::string contractName = ":Factory";
+		std::string contractName = ":C";
 		byteCode = solCompilationFramework.compileContract(contract_source, contractName);
 		Json::Value methodIdentifiers = solCompilationFramework.getMethodIdentifiers();
 		// We always call the function test() that is defined in proto converter template
 		hexEncodedInput = methodIdentifiers["test()"].asString();
 	}
-	catch (...)
+	// Ignore compilation failures
+	catch (Exception const&)
 	{
-		cout << contract_source << endl;
-		throw;
-	}
-	// TODO: Call evmone wrapper here
 		return;
+	}
+
+	if (const char* dump_path = getenv("PROTO_FUZZER_DUMP_CODE"))
+	{
+		ofstream of(dump_path);
+		of << toHex(byteCode);
+	}
+
+	// We target the default EVM which is the latest
+	langutil::EVMVersion version = {};
+	EVMHost hostContext(version, evmone);
+
+	// Deploy contract and signal failure if deploy failed
+	evmc::result createResult = deployContract(hostContext, byteCode);
+	solAssert(
+		createResult.status_code == EVMC_SUCCESS,
+		"Proto ABIv2 Fuzzer: Contract creation failed"
+	);
+
+	// Execute test function and signal failure if EVM reverted or
+	// did not return expected output on successful execution.
+	evmc::result callResult = executeContract(
+		hostContext,
+		fromHex(hexEncodedInput),
+		createResult.create_address
+	);
+
+	// We don't care about EVM One failures other than EVMC_REVERT
+	solAssert(callResult.status_code != EVMC_REVERT, "Proto ABIv2 fuzzer: EVM One reverted");
+	if (callResult.status_code == EVMC_SUCCESS)
+		solAssert(
+			isOutputExpected(callResult.output_data, callResult.output_size),
+			"Proto ABIv2 fuzzer: ABIv2 coding failure found"
+		);
 }