solidity/libdevcore/Common.h

/*
	This file is part of cpp-ethereum.

	cpp-ethereum 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.

	cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
/** @file Common.h
 * @author Gav Wood <i@gavwood.com>
 * @date 2014
 *
 * Very common stuff (i.e. that every other header needs except vector_ref.h).
 */

#pragma once

// way to many unsigned to size_t warnings in 32 bit build
#ifdef _M_IX86
#pragma warning(disable:4244)
#endif

#if _MSC_VER && _MSC_VER < 1900
#define _ALLOW_KEYWORD_MACROS
#define noexcept throw()
#endif

#ifdef __INTEL_COMPILER
#pragma warning(disable:3682) //call through incomplete class
#endif

#include <map>
#include <unordered_map>
#include <vector>
#include <set>
#include <unordered_set>
#include <functional>
#include <string>
#include <chrono>

#if defined(__GNUC__)
#pragma warning(push)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-parameter"
#endif // defined(__GNUC__)

// See https://github.com/ethereum/libweb3core/commit/90680a8c25bfb48b24371b4abcacde56c181517c
// See https://svn.boost.org/trac/boost/ticket/11328
// Bob comment - perhaps we should just HARD FAIL here with Boost-1.58.00?
// It is quite old now, and requiring end-users to use a newer Boost release is probably not unreasonable.
#include <boost/version.hpp>
#if (BOOST_VERSION == 105800)
	#include "boost_multiprecision_number_compare_bug_workaround.hpp"
#endif // (BOOST_VERSION == 105800)

#include <boost/multiprecision/cpp_int.hpp>

#if defined(__GNUC__)
#pragma warning(pop)
#pragma GCC diagnostic pop
#endif // defined(__GNUC__)

#include "vector_ref.h"

// CryptoPP defines byte in the global namespace, so must we.
using byte = uint8_t;

// Quote a given token stream to turn it into a string.
#define DEV_QUOTED_HELPER(s) #s
#define DEV_QUOTED(s) DEV_QUOTED_HELPER(s)

#define DEV_IGNORE_EXCEPTIONS(X) try { X; } catch (...) {}

namespace dev
{

// Binary data types.
using bytes = std::vector<byte>;
using bytesRef = vector_ref<byte>;
using bytesConstRef = vector_ref<byte const>;

template <class T>
class secure_vector
{
public:
	secure_vector() {}
	secure_vector(secure_vector<T> const& /*_c*/) = default;  // See https://github.com/ethereum/libweb3core/pull/44
	explicit secure_vector(unsigned _size): m_data(_size) {}
	explicit secure_vector(unsigned _size, T _item): m_data(_size, _item) {}
	explicit secure_vector(std::vector<T> const& _c): m_data(_c) {}
	explicit secure_vector(vector_ref<T> _c): m_data(_c.data(), _c.data() + _c.size()) {}
	explicit secure_vector(vector_ref<const T> _c): m_data(_c.data(), _c.data() + _c.size()) {}
	~secure_vector() { ref().cleanse(); }

	secure_vector<T>& operator=(secure_vector<T> const& _c)
	{
		if (&_c == this)
			return *this;

		ref().cleanse();
		m_data = _c.m_data;
		return *this;
	}
	std::vector<T>& writable() { clear(); return m_data; }
	std::vector<T> const& makeInsecure() const { return m_data; }

	void clear() { ref().cleanse(); }

	vector_ref<T> ref() { return vector_ref<T>(&m_data); }
	vector_ref<T const> ref() const { return vector_ref<T const>(&m_data); }

	size_t size() const { return m_data.size(); }
	bool empty() const { return m_data.empty(); }

	void swap(secure_vector<T>& io_other) { m_data.swap(io_other.m_data); }

private:
	std::vector<T> m_data;
};

using bytesSec = secure_vector<byte>;

// Numeric types.
using bigint = boost::multiprecision::number<boost::multiprecision::cpp_int_backend<>>;
using u64 =  boost::multiprecision::number<boost::multiprecision::cpp_int_backend<64, 64, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>>;
using u128 =  boost::multiprecision::number<boost::multiprecision::cpp_int_backend<128, 128, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>>;
using u256 =  boost::multiprecision::number<boost::multiprecision::cpp_int_backend<256, 256, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>>;
using s256 =  boost::multiprecision::number<boost::multiprecision::cpp_int_backend<256, 256, boost::multiprecision::signed_magnitude, boost::multiprecision::unchecked, void>>;
using u160 =  boost::multiprecision::number<boost::multiprecision::cpp_int_backend<160, 160, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>>;
using s160 =  boost::multiprecision::number<boost::multiprecision::cpp_int_backend<160, 160, boost::multiprecision::signed_magnitude, boost::multiprecision::unchecked, void>>;
using u512 =  boost::multiprecision::number<boost::multiprecision::cpp_int_backend<512, 512, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>>;
using s512 =  boost::multiprecision::number<boost::multiprecision::cpp_int_backend<512, 512, boost::multiprecision::signed_magnitude, boost::multiprecision::unchecked, void>>;
using u256s = std::vector<u256>;
using u160s = std::vector<u160>;
using u256Set = std::set<u256>;
using u160Set = std::set<u160>;

// Map types.
using StringMap = std::map<std::string, std::string>;

// Hash types.
using StringHashMap = std::unordered_map<std::string, std::string>;

// String types.
using strings = std::vector<std::string>;
// Fixed-length string types.
using string32 = std::array<char, 32>;

// Null/Invalid values for convenience.
static const bytes NullBytes;

/// Interprets @a _u as a two's complement signed number and returns the resulting s256.
inline s256 u2s(u256 _u)
{
	static const bigint c_end = bigint(1) << 256;
	if (boost::multiprecision::bit_test(_u, 255))
		return s256(-(c_end - _u));
	else
		return s256(_u);
}

/// @returns the two's complement signed representation of the signed number _u.
inline u256 s2u(s256 _u)
{
	static const bigint c_end = bigint(1) << 256;
    if (_u >= 0)
		return u256(_u);
    else
		return u256(c_end + _u);
}

template <size_t n> inline u256 exp10()
{
	return exp10<n - 1>() * u256(10);
}

template <> inline u256 exp10<0>()
{
	return u256(1);
}

/// RAII utility class whose destructor calls a given function.
class ScopeGuard
{
public:
	ScopeGuard(std::function<void(void)> _f): m_f(_f) {}
	~ScopeGuard() { m_f(); }

private:
	std::function<void(void)> m_f;
};

enum class WithExisting: int
{
	Trust = 0,
	Verify,
	Rescue,
	Kill
};

}