package com.coderising.jvm.cmd;
import com.coderising.jvm.clz.ClassFile;
import com.coderising.jvm.constant.ConstantPool;
import com.coderising.jvm.engine.ExecutionResult;
import com.coderising.jvm.engine.Heap;
import com.coderising.jvm.engine.JavaObject;
import com.coderising.jvm.engine.StackFrame;
public class NoOperandCmd extends ByteCodeCommand{
public NoOperandCmd(ClassFile clzFile, String opCode) {
super(clzFile, opCode);
}
@Override
public String toString(ConstantPool pool) {
return this.getOffset()+":" +this.getOpCode() + " "+ this.getReadableCodeText();
}
public int getLength(){
return 1;
}
@Override
public void execute(StackFrame frame, ExecutionResult result) {
String opCode = this.getOpCode();
if(ByteCodeCommand.aload_0.equalsIgnoreCase(opCode)){
JavaObject jo = frame.getLocalVariableValue(0);
frame.getOprandStack().push(jo);
} else if(ByteCodeCommand.aload_1.equalsIgnoreCase(opCode)){
JavaObject jo = frame.getLocalVariableValue(1);
frame.getOprandStack().push(jo);
} else if(ByteCodeCommand.aload_2.equalsIgnoreCase(opCode)){
JavaObject jo = frame.getLocalVariableValue(2);
frame.getOprandStack().push(jo);
}else if(ByteCodeCommand.iload_1.equalsIgnoreCase(opCode)){
JavaObject jo = frame.getLocalVariableValue(1);
frame.getOprandStack().push(jo);
} else if (ByteCodeCommand.iload_2.equalsIgnoreCase(opCode)){
JavaObject jo = frame.getLocalVariableValue(2);
frame.getOprandStack().push(jo);
} else if (ByteCodeCommand.iload_3.equalsIgnoreCase(opCode)){
JavaObject jo = frame.getLocalVariableValue(3);
frame.getOprandStack().push(jo);
}else if (ByteCodeCommand.fload_3.equalsIgnoreCase(opCode)){
JavaObject jo = frame.getLocalVariableValue(3);
frame.getOprandStack().push(jo);
}
else if (ByteCodeCommand.voidreturn.equalsIgnoreCase(opCode)){
result.setNextAction(ExecutionResult.EXIT_CURRENT_FRAME);
} else if(ByteCodeCommand.ireturn.equalsIgnoreCase(opCode)){
StackFrame callerFrame = frame.getCallerFrame();
JavaObject jo = frame.getOprandStack().pop();
callerFrame.getOprandStack().push(jo);
} else if(ByteCodeCommand.freturn.equalsIgnoreCase(opCode)){
StackFrame callerFrame = frame.getCallerFrame();
JavaObject jo = frame.getOprandStack().pop();
callerFrame.getOprandStack().push(jo);
}
else if(ByteCodeCommand.astore_1.equalsIgnoreCase(opCode)){
JavaObject jo = frame.getOprandStack().pop();
frame.setLocalVariableValue(1, jo);
} else if(ByteCodeCommand.dup.equalsIgnoreCase(opCode)){
JavaObject jo = frame.getOprandStack().peek();
frame.getOprandStack().push(jo);
} else if(ByteCodeCommand.iconst_0.equalsIgnoreCase(opCode)){
JavaObject jo = Heap.getInstance().newInt(0);
frame.getOprandStack().push(jo);
} else if(ByteCodeCommand.iconst_1.equalsIgnoreCase(opCode)){
JavaObject jo = Heap.getInstance().newInt(1);
frame.getOprandStack().push(jo);
} else if(ByteCodeCommand.istore_1.equalsIgnoreCase(opCode)){
JavaObject jo = frame.getOprandStack().pop();
frame.setLocalVariableValue(1, jo);
} else if(ByteCodeCommand.istore_2.equalsIgnoreCase(opCode)){
JavaObject jo = frame.getOprandStack().pop();
frame.setLocalVariableValue(2, jo);
} else if(ByteCodeCommand.iadd.equalsIgnoreCase(opCode)){
JavaObject jo1 = frame.getOprandStack().pop();
JavaObject jo2 = frame.getOprandStack().pop();
JavaObject sum = Heap.getInstance().newInt(jo1.getIntValue()+jo2.getIntValue());
frame.getOprandStack().push(sum);
} else if (ByteCodeCommand.aconst_null.equalsIgnoreCase(opCode)){
frame.getOprandStack().push(null);
}
else{
throw new RuntimeException("you must forget to implement the operation :" + opCode);
}
}
}