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Symbol.h
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Symbol.h
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//
// Copyright 2023 Vedad Hadžić, Graz University of Technology
//
// 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.
//
#ifndef SYMBOL_H
#define SYMBOL_H
#include "SymbolManager.h"
class Symbol
{
public:
/// Manager in charge of this symbol
static SymbolManager s_manager;
private:
/// Variable identifier for this symbol
var_t m_variable;
/// Position at which this is emitted
uint32_t m_position;
/// Constructor from variable index
explicit Symbol(var_t variable): m_variable(variable), m_position(s_manager.emission_slot(variable)) {}
public:
/// Default constructor creating an invalid symbol
Symbol() : m_variable(var_t::ZERO), m_position(INVALID_POS) {}
/// Constructor from boolean
explicit Symbol(bool value): m_variable(to_var(value)), m_position(INVALID_POS) {}
/// We use the default assignment operator
Symbol(const Symbol& other) = default;
/// We use the default assignment operator
Symbol& operator=(const Symbol& other) = default;
/// We define a custom assignment operator from booleans
Symbol& operator=(bool other_val) { m_variable = to_var(other_val); m_position = INVALID_POS; return *this; };
Symbol& operator=(var_t other_val) = delete;
Symbol& operator=(uint8_t other_val) = delete;
Symbol& operator=(uint16_t other_val) = delete;
Symbol& operator=(uint32_t other_val) = delete;
Symbol& operator=(uint64_t other_val) = delete;
/// Returns the variable index
inline var_t var() const { return m_variable; }
/// Returns the position index
inline uint32_t pos() const { return m_position; }
/// Creates a new symbolic value
friend Symbol create_symbol();
/// Emits symbol at a new position
void emit(bool write = true);
/// Simplifying operator PLUS (+)
friend Symbol operator+(const Symbol& a)
{ return Symbol(a); }
/// Simplifying operator NOT (!)
friend Symbol operator!(const Symbol& a);
/// Simplifying operator AND (&)
friend Symbol operator&(const Symbol& a, const Symbol& b);
/// Simplifying operator XOR (^)
friend Symbol operator^(const Symbol& a, const Symbol& b);
/// Simplifying operator OR (|)
friend Symbol operator|(const Symbol& a, const Symbol& b);
/// Simplifying operator MUX (?:)
friend Symbol mux(const Symbol& cond, const Symbol& t_val, const Symbol& e_val);
/// Compares two Symbols by variable index
friend bool operator<(const Symbol& a, const Symbol& b);
/// Compares two Symbols for equality
friend bool operator==(const Symbol& a, const Symbol& b);
friend bool operator!=(const Symbol& a, const Symbol& b);
friend std::ostream& operator<<(std::ostream& out, const Symbol& sym);
};
Symbol create_symbol();
Symbol mux(const Symbol& s, const Symbol& t, const Symbol& e);
#endif // SYMBOL_H