OpCode.cpp

/*
 Sami Badra: masc0673
 Genaro Orodio, masc0633
 Daniel Silva, masc0624
 
 CS 530, Spring 2015
 Assignment #2, disassembler
 FILE: OpCode.cpp
 
 Copyright (c) 2015 Sami Badra. All rights reserved.
 */

#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;
}