miniCompiler/Iloc.java at master · TechHead27/miniCompiler · GitHub

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import java.util.*;

public class Iloc
{
	private int numArgs; // 0, 1, 2, or 3
	private String instruction;
	private String[] args = new String[3];

	public Iloc()
	{
		numArgs = 0;
		instruction = "";
	}

	public Iloc(String instruction)
	{
		numArgs = 0;
		this.instruction = instruction;
	}

	public Iloc(String instruction, String r1)
	{
		this.instruction = instruction;
		addArg(r1);
	}

	public Iloc(String instruction, String r1, String r2)
	{
		this.instruction = instruction;
		addArg(r1);
		addArg(r2);
	}

	public Iloc(String instruction, String r1, String r2, String r3)
	{
		this.instruction = instruction;
		addArg(r1);
		addArg(r2);
		addArg(r3);
	}

   public void swapIloc(String instruction)
   {
      this.instruction = instruction;
      args = new String[3];
      numArgs = 0;
   }

   public void swapIloc(String instruction, String r1)
   {
      swapIloc(instruction);
      addArg(r1);
   }

   public void swapIloc(String instruction, String r1, String r2)
   {
      swapIloc(instruction, r1);
      addArg(r2);
   }

   public void swapIloc(String instruction, String r1, String r2, String r3)
   {
      swapIloc(instruction, r1, r2);
      addArg(r3);
   }

	public String toString()
	{
		String ret = instruction;
		for (int i = 0; i < numArgs; i++)
			ret += (i != 0 ? "," : "") + " " +args[i];
		return ret;
	}

   public void setArg(int index, String arg)
   {
      args[index] = arg;
   }

	public void addArg(String arg)
	{
		args[numArgs++] = arg;
	}

   public String getInst()
   {
      return instruction;
   }

   public String getReg(int i)
   {
      if (i < numArgs)
         return args[i];
      else
         return null;
   }

   public void replace(HashMap<String,String> reverse)
   {
      int[] sources = getSource();
      for (int i : sources)
      {
         String replacing = args[i];
         while (reverse.containsKey(replacing))
            replacing = reverse.get(replacing);

         args[i] = replacing;
      }
   }

   public int[] getSource()
   {
      switch (instruction)
      {
         case "movlti":
         case "movgti":
         case "movnei":
         case "movlei":
         case "movgei":
         case "moveqi":
            return new int[]{0,2};
         case "addi":
         case "brz":
         case "del":
         case "loadai":
         case "mov":
         case "neg":
         case "print":
         case "storeglobal":
         case "storeoutargument":
         case "storeret":
         case "xori":
            return new int[]{0};
         case "add":
         case "and":
         case "comp":
         case "div":
         case "mult":
         case "or":
         case "storeai":
         case "sub":
            return new int[]{0,1};
         default: // for labels
            return new int[]{};
      }
   }

   public String getTarget()
   {
      switch (instruction)
      {
         case "loadinargument":
            return args[2];
            //break;

         case "mov":
            return args[1];
            //break;

         case "read":
            return args[0];
            //break;

         case "loadi":
            return args[1];
            //break;

         case "loadglobal":
            return args[1];
            //break;

         case "loadai":
            return args[2];
            //break;

         case "movlti":
         case "movgti":
         case "movnei":
         case "movlei":
         case "movgei":
         case "moveqi":
            return args[2];
            //break;

         case "add":
         case "sub":
         case "mult":
         case "div":
         case "and":
         case "or":
            return args[2];
            //break;

         case "xori":
            return args[0];
            //break;

         case "new":
            return args[1];
            //break;

         case "loadret":
            return args[0];

         default:
            return null;
      }
   }

	//access would be iloc.args[0,1,2]

}