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80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
// -*- mode: C++; c-file-style: "cc-mode" -*-
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//*************************************************************************
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// DESCRIPTION: Verilator: Hash calculation
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//
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// Code available from: https://verilator.org
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//
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//*************************************************************************
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//
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// Copyright 2003-2023 by Wilson Snyder. This program is free software; you
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// can redistribute it and/or modify it under the terms of either the GNU
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// Lesser General Public License Version 3 or the Perl Artistic License
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// Version 2.0.
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// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
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//
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//*************************************************************************
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#ifndef VERILATOR_V3HASH_H_
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#define VERILATOR_V3HASH_H_
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#include "verilatedos.h"
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#include <cstdint>
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#include <string>
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//######################################################################
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// V3Hash -- Generic hashing
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class V3Hash final {
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uint32_t m_value; // The 32-bit hash value.
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static uint32_t combine(uint32_t a, uint32_t b) {
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return a ^ (b + 0x9e3779b9 + (a << 6) + (a >> 2));
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}
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public:
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// CONSTRUCTORS
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V3Hash()
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: m_value{0} {}
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explicit V3Hash(uint32_t val)
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: m_value{val} {}
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explicit V3Hash(int32_t val)
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: m_value{static_cast<uint32_t>(val)} {}
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explicit V3Hash(uint64_t val)
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: m_value{combine(static_cast<uint32_t>(val), static_cast<uint32_t>(val >> 32))} {}
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explicit V3Hash(int64_t val)
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: m_value{combine(static_cast<uint32_t>(val), static_cast<uint32_t>(val >> 32))} {}
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explicit V3Hash(const std::string& val);
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// METHODS
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uint32_t value() const VL_MT_SAFE { return m_value; }
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std::string toString() const VL_MT_SAFE;
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// OPERATORS
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// Comparisons
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bool operator==(const V3Hash& rh) const { return m_value == rh.m_value; }
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bool operator!=(const V3Hash& rh) const { return m_value != rh.m_value; }
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bool operator<(const V3Hash& rh) const { return m_value < rh.m_value; }
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// '+' combines hashes
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template <class T>
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V3Hash operator+(T that) const {
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return V3Hash{combine(m_value, V3Hash{that}.m_value)};
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}
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// '+=' combines in place
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template <class T>
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V3Hash& operator+=(T that) {
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return *this = *this + that;
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}
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};
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std::ostream& operator<<(std::ostream& os, const V3Hash& rhs) VL_MT_SAFE;
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template <>
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struct std::hash<V3Hash> {
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std::size_t operator()(const V3Hash& h) const noexcept { return h.value(); }
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};
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#endif // Guard
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