package backend.mips;

import java.util.ArrayList;

public enum Register {
    ZERO("$zero"),
    AT("$at"),
    V0("$v0"),
    V1("$v1"),
    A0("$a0"),
    A1("$a1"),
    A2("$a2"),
    A3("$a3"),
    T0("$t0"),
    T1("$t1"),
    T2("$t2"),
    T3("$t3"),
    T4("$t4"),
    T5("$t5"),
    T6("$t6"),
    T7("$t7"),
    S0("$s0"),
    S1("$s1"),
    S2("$s2"),
    S3("$s3"),
    S4("$s4"),
    S5("$s5"),
    S6("$s6"),
    S7("$s7"),
    T8("$t8"),
    T9("$t9"),
    K0("$k0"),
    K1("$k1"),
    GP("$gp"),
    SP("$sp"),
    FP("$fp"),
    RA("$ra");

    private String regName;

    Register(String regName) {
        this.regName = regName;
    }

    public String toString() {
        return regName;
    }

    public static ArrayList<Register> availableRegisters() {
        ArrayList<Register> regs = new ArrayList<>();
        for (Register reg : Register.values()) {
            if (reg.toString().charAt(1) == 't' || reg.toString().charAt(1) == 's') {
                regs.add(reg);
            }
        }
        return regs;
    }
}