/*
 * Copyright (C) 2014, United States Government, as represented by the
 * Administrator of the National Aeronautics and Space Administration.
 * All rights reserved.
 *
 * The Java Pathfinder core (jpf-core) platform is licensed under the
 * Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 *        http://www.apache.org/licenses/LICENSE-2.0. 
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and 
 * limitations under the License.
 */
package gov.nasa.jpf.jvm.bytecode;

import gov.nasa.jpf.vm.ArrayIndexOutOfBoundsExecutiveException;
import gov.nasa.jpf.vm.BooleanArrayFields;
import gov.nasa.jpf.vm.ByteArrayFields;
import gov.nasa.jpf.vm.ElementInfo;
import gov.nasa.jpf.vm.Fields;
import gov.nasa.jpf.vm.StackFrame;


/**
 * Load byte or boolean from array
 * ..., arrayref, index => ..., value
 */
public class BALOAD extends ArrayLoadInstruction {

  @Override
  protected void push (StackFrame frame, ElementInfo ei, int index) throws ArrayIndexOutOfBoundsExecutiveException {
    ei.checkArrayBounds(index);

    int value = 0;
    Fields f = ei.getFields();
    if (f instanceof ByteArrayFields){
      value = ei.getByteElement(index);
    } else if (f instanceof BooleanArrayFields){
      value = ei.getBooleanElement(index) ? 1 : 0;
    }

    frame.push( value);
  }


  @Override
  public int getByteCode () {
    return 0x33;
  }
  
  @Override
  public void accept(JVMInstructionVisitor insVisitor) {
	  insVisitor.visit(this);
  }
}