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Java example source code file (BytecodeNewArray.java)

This example Java source code file (BytecodeNewArray.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bytecode, bytecodenewarray, string, stringbuffer

The BytecodeNewArray.java Java example source code

/*
 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

package sun.jvm.hotspot.interpreter;

import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.utilities.*;

public class BytecodeNewArray extends Bytecode {
  BytecodeNewArray(Method method, int bci) {
    super(method, bci);
  }

  public int getType() {
    return (int) javaByteAt(1);
  }

  public void verify() {
    if (Assert.ASSERTS_ENABLED) {
      Assert.that(isValid(), "check newarray");
    }
  }

  public boolean isValid() {
    boolean result = javaCode() == Bytecodes._newarray;
    if (result == false) return false;
    switch (getType()) {
       case TypeArrayKlass.T_BOOLEAN:
       case TypeArrayKlass.T_CHAR:
       case TypeArrayKlass.T_FLOAT:
       case TypeArrayKlass.T_DOUBLE:
       case TypeArrayKlass.T_BYTE:
       case TypeArrayKlass.T_SHORT:
       case TypeArrayKlass.T_INT:
       case TypeArrayKlass.T_LONG:
          break;
       default:
          return false;
     }

     return true;
  }

  public String getTypeName() {
     String result;
     switch (getType()) {
       case TypeArrayKlass.T_BOOLEAN:
          result = "boolean";
          break;

       case TypeArrayKlass.T_CHAR:
          result = "char";
          break;

       case TypeArrayKlass.T_FLOAT:
          result = "float";
          break;

       case TypeArrayKlass.T_DOUBLE:
          result = "double";
          break;

       case TypeArrayKlass.T_BYTE:
          result = "byte";
          break;

       case TypeArrayKlass.T_SHORT:
          result = "short";
          break;

       case TypeArrayKlass.T_INT:
          result = "int";
          break;

       case TypeArrayKlass.T_LONG:
          result = "long";
          break;

       default: // should not happen
          result = "<invalid>";
          break;
     }

     return result;
  }

  public static BytecodeNewArray at(Method method, int bci) {
    BytecodeNewArray b = new BytecodeNewArray(method, bci);
    if (Assert.ASSERTS_ENABLED) {
      b.verify();
    }
    return b;
  }

  /** Like at, but returns null if the BCI is not at newarray  */
  public static BytecodeNewArray atCheck(Method method, int bci) {
    BytecodeNewArray b = new BytecodeNewArray(method, bci);
    return (b.isValid() ? b : null);
  }

  public static BytecodeNewArray at(BytecodeStream bcs) {
    return new BytecodeNewArray(bcs.method(), bcs.bci());
  }

  public String toString() {
    StringBuffer buf = new StringBuffer();
    buf.append("newarray");
    buf.append(spaces);
    buf.append(getTypeName());
    return buf.toString();
  }
}

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