Mercurial > hg > truffle
diff graal/com.oracle.graal.graphbuilderconf/src/com/oracle/graal/graphbuilderconf/MethodIdHolder.java @ 20902:7cc48e7e6bfe
generalized InvocationPluginIdHolder to MethodIdHolder
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Fri, 10 Apr 2015 16:29:48 +0200 |
parents | graal/com.oracle.graal.graphbuilderconf/src/com/oracle/graal/graphbuilderconf/InvocationPluginIdHolder.java@b950967f74c7 |
children | dc58f4ca21c9 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.graal.graphbuilderconf/src/com/oracle/graal/graphbuilderconf/MethodIdHolder.java Fri Apr 10 16:29:48 2015 +0200 @@ -0,0 +1,96 @@ +/* + * Copyright (c) 2015, 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.graphbuilderconf; + +import java.util.*; +import java.util.function.*; + +import com.oracle.graal.api.meta.*; + +/** + * {@link ResolvedJavaMethod}s that can be assigned a globally unique identifier for use as keys in + * an array based map. This should only be used where the cost of a {@link Map} with + * {@link ResolvedJavaMethod}s as keys is too high. + */ +public interface MethodIdHolder extends ResolvedJavaMethod { + /** + * Sets the unique, positive, non-zero identifier for this method. + */ + void setMethodId(int id); + + /** + * Gets the identifier set by {@link #setMethodId(int)} or 0 if no identifier was assigned to + * this method. + */ + int getMethodId(); + + /** + * A singleton class for allocating globally unique method identifiers. + */ + static final class MethodIdAllocator { + + /** + * Ensures a given method has a unique identifier. + */ + public int assignId(MethodIdHolder holder) { + assert Thread.holdsLock(instance) : "must only be called from within MethodIdHolder.allocateIds"; + int id = holder.getMethodId(); + if (id == 0) { + id = nextId++; + holder.setMethodId(id); + if (idVerifierMap != null) { + idVerifierMap.put(holder, id); + } + } else { + assert idVerifierMap.get(holder) == id; + } + return id; + } + + private int nextId = 1; + private final Map<MethodIdHolder, Integer> idVerifierMap; + + @SuppressWarnings("all") + private MethodIdAllocator() { + boolean assertionsEnabled = false; + assert assertionsEnabled = true; + idVerifierMap = assertionsEnabled ? new HashMap<>() : null; + } + + /** + * Singleton instance. + */ + private static final MethodIdAllocator instance = new MethodIdAllocator(); + } + + /** + * Executes some given code that ensures some set of {@link ResolvedJavaMethod}s have unique ids + * {@linkplain MethodIdHolder#setMethodId(int) assigned} to them. The + * {@link Consumer#accept(Object)} method of the given object is called under a global lock. + */ + static void assignIds(Consumer<MethodIdAllocator> methodIdConsumer) { + synchronized (MethodIdAllocator.instance) { + methodIdConsumer.accept(MethodIdAllocator.instance); + } + } +}