Mercurial > hg > truffle
view graal/com.oracle.max.graal.runtime/src/com/oracle/max/graal/runtime/HotSpotConstantPool.java @ 2874:d90bf514d647
Renamed packages.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 08 Jun 2011 08:59:54 +0200 |
parents | graal/com.oracle.max.graal.runtime/src/com/oracle/graal/runtime/HotSpotConstantPool.java@0341b6424579 |
children | 5857923e563c |
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/* * Copyright (c) 2011, 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.max.graal.runtime; import java.io.*; import java.util.*; import com.sun.cri.ri.*; /** * Implementation of RiConstantPool for HotSpot. */ public class HotSpotConstantPool extends CompilerObject implements RiConstantPool { private final long vmId; private final FastLRUIntCache<RiMethod> methodCache = new FastLRUIntCache<RiMethod>(); private final FastLRUIntCache<RiField> fieldCache = new FastLRUIntCache<RiField>(); private final FastLRUIntCache<RiType> typeCache = new FastLRUIntCache<RiType>(); public static class FastLRUIntCache<T> implements Serializable { private static final int InitialCapacity = 4; private int lastKey; private T lastObject; private int[] keys; private Object[] objects; private int count; @SuppressWarnings("unchecked") private T access(int index) { return (T) objects[index]; } public T get(int key) { if (key == lastKey) { return lastObject; } else if (count > 1) { for (int i = 0; i < count; ++i) { if (keys[i] == key) { lastObject = access(i); lastKey = key; return lastObject; } } } return null; } public void add(int key, T object) { count++; if (count == 1) { lastKey = key; lastObject = object; } else { ensureSize(); keys[count - 1] = key; objects[count - 1] = object; if (count == 2) { keys[0] = lastKey; objects[0] = lastObject; } lastKey = key; lastObject = object; } } private void ensureSize() { if (keys == null) { keys = new int[InitialCapacity]; objects = new Object[InitialCapacity]; } else if (count > keys.length) { keys = Arrays.copyOf(keys, keys.length * 2); objects = Arrays.copyOf(objects, objects.length * 2); } } } public HotSpotConstantPool(Compiler compiler, long vmId) { super(compiler); this.vmId = vmId; } @Override public Object lookupConstant(int cpi) { Object constant = compiler.getVMEntries().RiConstantPool_lookupConstant(vmId, cpi); return constant; } @Override public RiSignature lookupSignature(int cpi) { return compiler.getVMEntries().RiConstantPool_lookupSignature(vmId, cpi); } @Override public RiMethod lookupMethod(int cpi, int byteCode) { RiMethod result = methodCache.get(cpi); if (result == null) { result = compiler.getVMEntries().RiConstantPool_lookupMethod(vmId, cpi, (byte) byteCode); methodCache.add(cpi, result); } return result; } @Override public RiType lookupType(int cpi, int opcode) { RiType result = typeCache.get(cpi); if (result == null) { result = compiler.getVMEntries().RiConstantPool_lookupType(vmId, cpi); typeCache.add(cpi, result); } return result; } @Override public RiField lookupField(int cpi, int opcode) { RiField result = fieldCache.get(cpi); if (result == null) { result = compiler.getVMEntries().RiConstantPool_lookupField(vmId, cpi, (byte) opcode); fieldCache.add(cpi, result); } return result; } }