1 /*
   2  * Copyright (c) 2012, 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 jdk.vm.ci.meta;
  24 
  25 /**
  26  * An implementation of {@link ProfilingInfo} that can used in the absence of real profile
  27  * information.
  28  */
  29 public final class DefaultProfilingInfo implements ProfilingInfo {
  30 
  31     private static final ProfilingInfo[] NO_PROFILING_INFO = new ProfilingInfo[]{new DefaultProfilingInfo(TriState.TRUE), new DefaultProfilingInfo(TriState.FALSE),
  32                     new DefaultProfilingInfo(TriState.UNKNOWN)};
  33 
  34     private final TriState exceptionSeen;
  35 
  36     DefaultProfilingInfo(TriState exceptionSeen) {
  37         this.exceptionSeen = exceptionSeen;
  38     }
  39 
  40     @Override
  41     public int getCodeSize() {
  42         return 0;
  43     }
  44 
  45     @Override
  46     public JavaTypeProfile getTypeProfile(int bci) {
  47         return null;
  48     }
  49 
  50     @Override
  51     public JavaMethodProfile getMethodProfile(int bci) {
  52         return null;
  53     }
  54 
  55     @Override
  56     public double getBranchTakenProbability(int bci) {
  57         return -1;
  58     }
  59 
  60     @Override
  61     public double[] getSwitchProbabilities(int bci) {
  62         return null;
  63     }
  64 
  65     @Override
  66     public TriState getExceptionSeen(int bci) {
  67         return exceptionSeen;
  68     }
  69 
  70     @Override
  71     public TriState getNullSeen(int bci) {
  72         return TriState.UNKNOWN;
  73     }
  74 
  75     @Override
  76     public int getExecutionCount(int bci) {
  77         return -1;
  78     }
  79 
  80     public static ProfilingInfo get(TriState exceptionSeen) {
  81         return NO_PROFILING_INFO[exceptionSeen.ordinal()];
  82     }
  83 
  84     @Override
  85     public int getDeoptimizationCount(DeoptimizationReason reason) {
  86         return 0;
  87     }
  88 
  89     @Override
  90     public boolean isMature() {
  91         return false;
  92     }
  93 
  94     @Override
  95     public String toString() {
  96         return "BaseProfilingInfo<" + this.toString(null, "; ") + ">";
  97     }
  98 
  99     public void setMature() {
 100         // Do nothing
 101     }
 102 
 103     public boolean setCompilerIRSize(Class<?> irType, int nodeCount) {
 104         return false;
 105     }
 106 
 107     public int getCompilerIRSize(Class<?> irType) {
 108         return -1;
 109     }
 110 }