match.h

/*
 * SPDX-FileCopyrightText: 2013 Barefoot Networks, Inc.
 * Copyright 2013-present Barefoot Networks, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef LIB_MATCH_H_
#define LIB_MATCH_H_
 
#include <stdint.h>
 
#include <iostream>
 
#include "big_int_util.h"
 
namespace P4 {

struct match_t {
    big_int word0, word1;
    match_t() : word0(0), word1(0) {}
    match_t(big_int w0, big_int w1) : word0(w0), word1(w1) {}
    explicit operator bool() const { return (word0 | word1) != 0; }
    bool operator==(const match_t &a) const { return word0 == a.word0 && word1 == a.word1; }
    bool operator!=(const match_t &a) const { return word0 != a.word0 || word1 != a.word1; }
    bool matches(big_int v) const {
        return (v | word1) == word1 && ((~v & word1) | word0) == word0;
    }
    void setwidth(int bits) {
        big_int mask = (big_int(1) << bits) - 1;
        word0 &= mask;
        word1 &= mask;
        mask &= ~(word0 | word1);
        word0 |= mask;
        word1 |= mask;
    }
    match_t(int size, big_int val, big_int mask) : word0(~val & mask), word1(val & mask) {
        setwidth(size);
    }
    static match_t dont_care(int size) { return match_t(size, 0, 0); }
};
 
std::ostream &operator<<(std::ostream &, const match_t &);
bool operator>>(const char *, match_t &);
 
}  // namespace P4
 
#endif /* LIB_MATCH_H_ */