1 /*

     2  * Copyright (c) 2019, 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 jdk.vm.ci.meta;

    26 

    27 import java.util.Arrays;

    28 import java.util.function.Supplier;

    29 

    30 import jdk.vm.ci.meta.SpeculationLog.SpeculationReason;

    31 

    32 /**

    33  * An implementation of {@link SpeculationReason} based on encoded values.

    34  */

    35 public class EncodedSpeculationReason implements SpeculationReason {

    36     final int groupId;

    37     final String groupName;

    38     final Object[] context;

    39     private SpeculationLog.SpeculationReasonEncoding encoding;

    40 

    41     public EncodedSpeculationReason(int groupId, String groupName, Object[] context) {

    42         this.groupId = groupId;

    43         this.groupName = groupName;

    44         this.context = context;

    45     }

    46 

    47     @Override

    48     public boolean equals(Object obj) {

    49         if (obj instanceof EncodedSpeculationReason) {

    50             if (obj instanceof EncodedSpeculationReason) {

    51                 EncodedSpeculationReason that = (EncodedSpeculationReason) obj;

    52                 return this.groupId == that.groupId && Arrays.equals(this.context, that.context);

    53             }

    54             return false;

    55         }

    56         return false;

    57     }

    58 

    59     @Override

    60     public SpeculationLog.SpeculationReasonEncoding encode(Supplier<SpeculationLog.SpeculationReasonEncoding> encodingSupplier) {

    61         if (encoding == null) {

    62             encoding = encodingSupplier.get();

    63             encoding.addInt(groupId);

    64             for (Object o : context) {

    65                 if (o == null) {

    66                     encoding.addInt(0);

    67                 } else {

    68                     addNonNullObject(encoding, o);

    69                 }

    70             }

    71         }

    72         return encoding;

    73     }

    74 

    75     static void addNonNullObject(SpeculationLog.SpeculationReasonEncoding encoding, Object o) {

    76         Class<? extends Object> c = o.getClass();

    77         if (c == String.class) {

    78             encoding.addString((String) o);

    79         } else if (c == Byte.class) {

    80             encoding.addByte((Byte) o);

    81         } else if (c == Short.class) {

    82             encoding.addShort((Short) o);

    83         } else if (c == Character.class) {

    84             encoding.addShort((Character) o);

    85         } else if (c == Integer.class) {

    86             encoding.addInt((Integer) o);

    87         } else if (c == Long.class) {

    88             encoding.addLong((Long) o);

    89         } else if (c == Float.class) {

    90             encoding.addInt(Float.floatToRawIntBits((Float) o));

    91         } else if (c == Double.class) {

    92             encoding.addLong(Double.doubleToRawLongBits((Double) o));

    93         } else if (o instanceof Enum) {

    94             encoding.addInt(((Enum<?>) o).ordinal());

    95         } else if (o instanceof ResolvedJavaMethod) {

    96             encoding.addMethod((ResolvedJavaMethod) o);

    97         } else if (o instanceof ResolvedJavaType) {

    98             encoding.addType((ResolvedJavaType) o);

    99         } else if (o instanceof ResolvedJavaField) {

   100             encoding.addField((ResolvedJavaField) o);

   101         } else {

   102             throw new IllegalArgumentException("Unsupported type for encoding: " + c.getName());

   103         }

   104     }

   105 

   106     @Override

   107     public int hashCode() {

   108         return groupId + Arrays.hashCode(this.context);

   109     }

   110 

   111     @Override

   112     public String toString() {

   113         return String.format("%s@%d%s", groupName, groupId, Arrays.toString(context));

   114     }

   115 }