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// Simulator for the RISC-V[ECTOR] mini-ISA
// Copyright (C) 2025 Siddarth Suresh
// Copyright (C) 2025 bdunahu
// This program 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.
// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
#ifndef EX_H
#define EX_H
#include "instrDTO.h"
#include "response.h"
#include "stage.h"
#include <exception>
#include <unordered_map>
#define ADDITION_OF_GUARD(a, b) \
(b >= 0) && (a > MAX_INT - b)
#define ADDITION_UF_GUARD(a, b) \
(b < 0) && (a < (-(MAX_INT)-1) - b)
#define SUBTRACTION_OF_GUARD(a, b) \
(b < 0) && (a > MAX_INT + b)
#define SUBTRACTION_UF_GUARD(a, b) \
(b >= 0) && (a < (-(MAX_INT)-1) + b)
#define MULTIPLICATION_OF_GUARD(a, b) \
(b != 0) && \
(((b > 0) && (a > 0) && (a > MAX_INT / b)) || \
((b < 0) && (a < 0) && (a < MAX_INT / b)))
#define MULTIPLICATION_UF_GUARD(a, b) \
(b != 0) && \
(((b > 0) && (a < 0) && (a < (-(MAX_INT)-1) / b)) || \
((b < 0) && (a > 0) && (a > (-(MAX_INT)-1) / b)))
#define DIVISION_OF_GUARD(a, b) \
((a == -(MAX_INT) - 1) && (b == -1)) || (b == 0)
class HaltException : public std::exception
{
const char *what() const noexcept override {
return "";
}
};
class EX : public Stage
{
public:
/**
* Constructor.
* @param The next stage in the pipeline.
* @return A newly allocated EX object.
*/
EX(Stage *next);
using Stage::advance;
private:
void advance_helper();
/**
* Wrapper for division functions, which detects HALT instructinos (division
* by 0).
* @param the numerator
* @param the denominator
* @param if the modulo operator should instead be used
*/
void handle_divide(signed int &s1, signed int s2, bool is_mod);
/**
* Maps each mnemonic to a function which carries out the instruction's base
* logic.
* All instructions store the result into s1.
*/
std::unordered_map<
Mnemonic,
std::function<void(
signed int &s1, signed int s2, signed int s3, unsigned int pc)>>
instr_map;
};
#endif /* EX_H_INCLUDED */
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