1 /*

     2  * Copyright (c) 2015, 2017, 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.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 package java.lang;

    26 

    27 final class LiveStackFrameInfo extends StackFrameInfo implements LiveStackFrame {

    28     private static Object[] EMPTY_ARRAY = new Object[0];

    29 

    30     // These flags must match the values maintained in the VM

    31     private static final int MODE_INTERPRETED = 0x01;

    32     private static final int MODE_COMPILED    = 0x02;

    33 

    34     LiveStackFrameInfo(StackWalker walker) {

    35         super(walker);

    36     }

    37 

    38     // These fields are initialized by the VM if ExtendedOption.LOCALS_AND_OPERANDS is set

    39     private Object[] monitors = EMPTY_ARRAY;

    40     private Object[] locals = EMPTY_ARRAY;

    41     private Object[] operands = EMPTY_ARRAY;

    42     private int mode = 0;

    43 

    44     @Override

    45     public Object[] getMonitors() {

    46         return monitors;

    47     }

    48 

    49     @Override

    50     public Object[] getLocals() {

    51         return locals;

    52     }

    53 

    54     @Override

    55     public Object[] getStack() {

    56         return operands;

    57     }

    58 

    59     @Override

    60     public String toString() {

    61         StringBuilder retVal = new StringBuilder(super.toString());

    62         if (mode != 0) {

    63             retVal.append("(");

    64             if ((mode & MODE_INTERPRETED) == MODE_INTERPRETED) {

    65                 retVal.append(" interpreted ");

    66             }

    67             if ((mode & MODE_COMPILED) == MODE_COMPILED) {

    68                 retVal.append(" compiled ");

    69             }

    70             retVal.append(")");

    71         }

    72         return retVal.toString();

    73     }

    74 

    75     /*

    76      * Convert primitive value to {@code PrimitiveSlot} object to represent

    77      * a local variable or an element on the operand stack of primitive type.

    78      */

    79 

    80     static PrimitiveSlot asPrimitive(int value) {

    81         return new PrimitiveSlot32(value);

    82     }

    83 

    84     static PrimitiveSlot asPrimitive(long value) {

    85         return new PrimitiveSlot64(value);

    86     }

    87 

    88     private static class PrimitiveSlot32 extends PrimitiveSlot {

    89         final int value;

    90         PrimitiveSlot32(int value) {

    91             this.value = value;

    92         }

    93 

    94         @Override

    95         public int size() {

    96             return 4;

    97         }

    98 

    99         @Override

   100         public int intValue() {

   101             return value;

   102         }

   103 

   104         @Override

   105         public String toString() {

   106             return String.valueOf(value);

   107         }

   108     }

   109 

   110     private static class PrimitiveSlot64 extends PrimitiveSlot {

   111         final long value;

   112         PrimitiveSlot64(long value) {

   113             this.value = value;

   114         }

   115 

   116         @Override

   117         public int size() {

   118             return 8;

   119         }

   120 

   121         @Override

   122         public long longValue() {

   123             return value;

   124         }

   125 

   126         @Override

   127         public String toString() {

   128             return String.valueOf(value);

   129         }

   130     }

   131 }