1 /*
   2  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.interpreter;
  26 
  27 import sun.jvm.hotspot.oops.*;
  28 import sun.jvm.hotspot.utilities.*;
  29 
  30 public class BytecodeFastIAccess0 extends BytecodeGetPut {
  31   BytecodeFastIAccess0(Method method, int bci) {
  32     super(method, bci);
  33   }
  34 
  35   public int index() {
  36     return (int) (0xFF & javaShortAt(2));
  37   }
  38 
  39   public boolean isStatic() {
  40     return false;
  41   }
  42 
  43   public void verify() {
  44     if (Assert.ASSERTS_ENABLED) {
  45       Assert.that(isValid(), "check fast_iaccess_0");
  46     }
  47   }
  48 
  49   public boolean isValid() {
  50     return code() == Bytecodes._fast_iaccess_0;
  51   }
  52 
  53   public static BytecodeFastIAccess0 at(Method method, int bci) {
  54     BytecodeFastIAccess0 b = new BytecodeFastIAccess0(method, bci);
  55     if (Assert.ASSERTS_ENABLED) {
  56       b.verify();
  57     }
  58     return b;
  59   }
  60 
  61   /** Like at, but returns null if the BCI is not at fast_iaccess_0  */
  62   public static BytecodeFastIAccess0 atCheck(Method method, int bci) {
  63     BytecodeFastIAccess0 b = new BytecodeFastIAccess0(method, bci);
  64     return (b.isValid() ? b : null);
  65   }
  66 
  67   public static BytecodeFastIAccess0 at(BytecodeStream bcs) {
  68     return new BytecodeFastIAccess0(bcs.method(), bcs.bci());
  69   }
  70 
  71   public String toString() {
  72     StringBuffer buf = new StringBuffer();
  73     buf.append("aload_0");
  74     buf.append(spaces);
  75     buf.append(super.toString());
  76     return buf.toString();
  77   }
  78 }