Mercurial > hg > truffle
view graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/ProfilingInfo.java @ 10448:8bb13e6ada94
Merge.
author | Christian Humer <christian.humer@gmail.com> |
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date | Thu, 20 Jun 2013 19:40:41 +0200 |
parents | a9311ec68721 |
children | 33ea8e2addac |
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/* * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.api.meta; /** * Provides access to the profiling information of one specific method. Every accessor method * returns the information that is available at the time of invocation. If a method is invoked * multiple times, it may return significantly different results for every invocation as the * profiling information may be changed by other Java threads at any time. */ public interface ProfilingInfo { /** * Represents the three possibilities that an exception was seen at a specific BCI. */ public enum TriState { TRUE, FALSE, UNKNOWN; public static TriState get(boolean value) { return value ? TRUE : FALSE; } } /** * Returns the length of the bytecodes associated with this profile. */ int getCodeSize(); /** * Returns an estimate of how often the branch at the given byte code was taken. * * @return The estimated probability, with 0.0 meaning never and 1.0 meaning always, or -1 if * this information is not available. */ double getBranchTakenProbability(int bci); /** * Returns an estimate of how often the switch cases are taken at the given BCI. The default * case is stored as the last entry. * * @return A double value that contains the estimated probabilities, with 0.0 meaning never and * 1.0 meaning always, or -1 if this information is not available. */ double[] getSwitchProbabilities(int bci); /** * Returns the TypeProfile for the given BCI. * * @return Returns a JavaTypeProfile object, or null if not available. */ JavaTypeProfile getTypeProfile(int bci); /** * Returns the MethodProfile for the given BCI. * * @return Returns a JavaMethodProfile object, or null if not available. */ JavaMethodProfile getMethodProfile(int bci); /** * Returns information if the given BCI did ever throw an exception. * * @return {@link TriState#TRUE} if the instruction has thrown an exception at least once, * {@link TriState#FALSE} if it never threw an exception, and {@link TriState#UNKNOWN} * if this information was not recorded. */ TriState getExceptionSeen(int bci); /** * Returns information if null was ever seen for the given BCI. * * @return {@link TriState#TRUE} if null was seen for the instruction, {@link TriState#FALSE} if * null was NOT seen, and {@link TriState#UNKNOWN} if this information was not recorded. */ TriState getNullSeen(int bci); /** * Returns an estimate how often the current BCI was executed. Avoid comparing execution counts * to each other, as the returned value highly depends on the time of invocation. * * @return the estimated execution count or -1 if not available. */ int getExecutionCount(int bci); /** * Returns how frequently a method was deoptimized for the given deoptimization reason. This * only indicates how often the method did fall back to the interpreter for the execution and * does not indicate how often it was recompiled. * * @param reason the reason for which the number of deoptimizations should be queried * @return the number of times the compiled method deoptimized for the given reason. */ int getDeoptimizationCount(DeoptimizationReason reason); /** * Returns true if the profiling information can be assumed as sufficiently accurate. * * @return true if the profiling information was recorded often enough mature enough, false * otherwise. */ boolean isMature(); }