1 /*

     2  * Copyright (c) 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.

     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 package org.graalvm.compiler.nodes;

    24 

    25 import org.graalvm.compiler.debug.GraalError;

    26 

    27 import jdk.vm.ci.meta.DeoptimizationAction;

    28 import jdk.vm.ci.meta.DeoptimizationReason;

    29 import jdk.vm.ci.meta.JavaConstant;

    30 

    31 public interface StaticDeoptimizingNode extends ValueNodeInterface {

    32 

    33     DeoptimizationReason getReason();

    34 

    35     DeoptimizationAction getAction();

    36 

    37     JavaConstant getSpeculation();

    38 

    39     /**

    40      * Describes how much information is gathered when deoptimization triggers.

    41      *

    42      * This enum is {@link Comparable} and orders its element from highest priority to lowest

    43      * priority.

    44      */

    45     enum GuardPriority {

    46         Speculation,

    47         Profile,

    48         None;

    49 

    50         public boolean isHigherPriorityThan(GuardPriority other) {

    51             return this.compareTo(other) < 0;

    52         }

    53 

    54         public boolean isLowerPriorityThan(GuardPriority other) {

    55             return this.compareTo(other) > 0;

    56         }

    57 

    58         public static GuardPriority highest() {

    59             return Speculation;

    60         }

    61     }

    62 

    63     default GuardPriority computePriority() {

    64         if (getSpeculation() != null && getSpeculation().isNonNull()) {

    65             return GuardNode.GuardPriority.Speculation;

    66         }

    67         switch (getAction()) {

    68             case InvalidateReprofile:

    69             case InvalidateRecompile:

    70                 return GuardNode.GuardPriority.Profile;

    71             case RecompileIfTooManyDeopts:

    72             case InvalidateStopCompiling:

    73             case None:

    74                 return GuardNode.GuardPriority.None;

    75         }

    76         throw GraalError.shouldNotReachHere();

    77     }

    78 }