OpCode.cpp

/*
 Sami Badra: masc0673
 
 CS 530, Spring 2015
 Assignment #2, disassembler
 FILE: OpCode.cpp
 
 Copyright (c) 2015 Sami Badra. All rights reserved.
 
 DISCLAIMER: Any unauthorized use, including but not limited to, copying or
 redistributing any chunk of the source code (or an entire file) will result in
 punishment by law. I, Sami Badra, own all rights to the files and their contents.
 */

#include "OpCode.h"
#define OP_TABLE_SIZE 59

struct opCode {
    string name;
    int opCode;
    int format; //format 3 refers to format 3 or format 4
};

const struct opCode opCodeTable [] = {
    {"ADD", 0x18, 3},  {"ADDF", 0x58, 3},   {"ADDR", 0x90, 2},   {"AND", 0x40, 3},  {"CLEAR", 0xB4, 2},
    {"COMP", 0x28, 3}, {"COMPF", 0x88, 3},  {"COMPR", 0xA0, 2},  {"DIV", 0x24, 3},  {"DIVF", 0x64, 3},
    {"DIVR", 0x9C, 2}, {"FIX", 0xC4, 1},    {"FLOAT", 0xC0, 1},  {"HIO", 0xF4, 1},  {"J", 0x3C, 3},
    {"JEQ", 0x30, 3},  {"JGT", 0x34, 3},    {"JLT", 0x38, 3},    {"JSUB", 0x48, 3}, {"LDA", 0x00, 3},
    {"LDB", 0x68, 3},  {"LDCH", 0x50, 3},   {"LDF", 0x70, 3},    {"LDL", 0x08, 3},  {"LDS", 0x6C, 3},
    {"LDT", 0x74, 3},  {"LDX", 0x04, 3},    {"LPS", 0xD0, 3},    {"MUL", 0x20, 3},  {"MULF", 0x60, 3},
    {"MULR", 0x98, 2}, {"NORM", 0xC8, 1},   {"OR", 0x44, 3},     {"RD", 0xD8, 3},   {"RMO", 0xAC, 2},
    {"RSUB", 0x4C, 3}, {"SHIFTL", 0xA4, 2}, {"SHIFTR", 0xA8, 2}, {"SIO", 0xF0, 1},  {"SSK", 0xEC, 3},
    {"STA", 0x0C, 3},  {"STB", 0x78, 3},    {"STCH", 0x54, 3},   {"STF", 0x80, 3},  {"STI", 0xD4, 3},
    {"STL", 0x14, 3},  {"STS", 0x7C, 3},    {"STSW", 0xE8, 3},   {"STT", 0x84, 3},  {"STX", 0x10, 3},
    {"SUB", 0x1C, 3},  {"SUBF", 0x5C, 3},   {"SUBR", 0x94, 2},   {"SVC", 0xB0, 2},  {"TD", 0xE0, 3},
    {"TIO", 0xF8, 1},  {"TIX", 0x2C, 3},    {"TIXR", 0xB8, 2},   {"WD", 0xDC, 3}
};

bool OpCode::getBit(int input, int position) {
    return ((input >> position) & 1);
}

string OpCode::getOpName(int opCode) {
    for (int i = 0; i < OP_TABLE_SIZE; i++)
        if (opCodeTable[i].opCode == opCode)
            return opCodeTable[i].name;
    int newOpCode = opCode & 0xFC;      //bit mask to get the first 6 bits
    return getOpName(newOpCode);
}

int OpCode::getOpFormat(int opCode) {
    opCode = opCode & 0xFC;      //bit mask to get the first 6 bits
    for (int i = 0; i < OP_TABLE_SIZE; i++)
        if (opCodeTable[i].opCode == opCode)
            return opCodeTable[i].format;
    return 0;
}