Mercurial > hg > truffle
view graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/SpeculationLog.java @ 11805:73a886a9564a
Make AbstractBeginNode a IterableNodeType and use this in ControlFlowGraph
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 26 Sep 2013 11:15:45 +0200 |
parents | dce9cefed571 |
children | b71a1d889db2 |
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/* * Copyright (c) 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.code; import java.util.*; import com.oracle.graal.api.meta.*; /** * Manages a list of unique deoptimization reasons and returns a unique index for each reason. This * class is not thread safe and assumes that at every point in time there is only a single Graal * compilation accessing this object. * */ public final class SpeculationLog { public static final int MAX_CACHE_SIZE = 1 << 15; private List<DeoptimizationReason> speculations = new ArrayList<>(); private boolean[] map = new boolean[10]; private Set<DeoptimizationReason> snapshot = new HashSet<>(); public short addSpeculation(DeoptimizationReason reason) { short index = (short) speculations.indexOf(reason); if (index != -1) { // Nothing to add, reason already registered. return index; } if (speculations.size() >= MAX_CACHE_SIZE) { throw new BailoutException("Too many deoptimization reasons recorded"); } speculations.add(reason); if (map.length < speculations.size()) { map = Arrays.copyOf(map, map.length * 2); } return (short) (speculations.size() - 1); } public boolean[] getRawMap() { return map; } public void snapshot() { for (int i = 0; i < speculations.size(); ++i) { if (map[i]) { snapshot.add(speculations.get(i)); } } } public boolean maySpeculate(DeoptimizationReason reason) { return !snapshot.contains(reason); } }