Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/SpeculationLog.java @ 23783:1523f2f7832f
renamed JVMCIPrintSystemProperties to JVMCIPrintProperties
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 05 Oct 2016 22:07:45 +0200 |
parents | 39f25354aeee |
children |
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/* * Copyright (c) 2012, 2014, 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 jdk.vm.ci.meta; /** * Manages unique deoptimization reasons. Reasons are embedded in compiled code and can be * invalidated at run time. Subsequent compilations then should not speculate again on such * invalidated reasons to avoid repeated deoptimization. * * All methods of this interface are called by the compiler. There is no need for API to register * failed speculations during deoptimization, since every VM has different needs there. */ public interface SpeculationLog { /** * Marker interface for speculation objects that can be added to the speculation log. */ public interface SpeculationReason { } /** * Must be called before compilation, i.e., before a compiler calls {@link #maySpeculate}. */ void collectFailedSpeculations(); /** * If this method returns true, the compiler is allowed to {@link #speculate} with the given * reason. */ boolean maySpeculate(SpeculationReason reason); /** * Registers a speculation that was performed by the compiler. * * @return A compiler constant encapsulating the provided reason. It is usually passed as an * argument to the deoptimization function. */ JavaConstant speculate(SpeculationReason reason); /** * Returns if this log has speculations. * * @return true if there are speculations, false otherwise */ boolean hasSpeculations(); }