// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holders nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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package org.apache.tapestry5.internal.plastic.asm.tree;

import java.util.Map;

import org.apache.tapestry5.internal.plastic.asm.MethodVisitor;

/**
 * A node that represents a local variable instruction. A local variable instruction is an
 * instruction that loads or stores the value of a local variable.
 *
 * @author Eric Bruneton
 */
public class VarInsnNode extends AbstractInsnNode {

  /** The operand of this instruction. This operand is the index of a local variable. */
  public int var;

  /**
   * Constructs a new {@link VarInsnNode}.
   *
   * @param opcode the opcode of the local variable instruction to be constructed. This opcode must
   *     be ILOAD, LLOAD, FLOAD, DLOAD, ALOAD, ISTORE, LSTORE, FSTORE, DSTORE, ASTORE or RET.
   * @param var the operand of the instruction to be constructed. This operand is the index of a
   *     local variable.
   */
  public VarInsnNode(final int opcode, final int var) {
    super(opcode);
    this.var = var;
  }

  /**
   * Sets the opcode of this instruction.
   *
   * @param opcode the new instruction opcode. This opcode must be ILOAD, LLOAD, FLOAD, DLOAD,
   *     ALOAD, ISTORE, LSTORE, FSTORE, DSTORE, ASTORE or RET.
   */
  public void setOpcode(final int opcode) {
    this.opcode = opcode;
  }

  @Override
  public int getType() {
    return VAR_INSN;
  }

  @Override
  public void accept(final MethodVisitor methodVisitor) {
    methodVisitor.visitVarInsn(opcode, var);
    acceptAnnotations(methodVisitor);
  }

  @Override
  public AbstractInsnNode clone(final Map<LabelNode, LabelNode> clonedLabels) {
    return new VarInsnNode(opcode, var).cloneAnnotations(this);
  }
}
