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 }