Mercurial > hg > graal-compiler
view c1x4hotspotsrc/HotSpotVM/src/com/sun/hotspot/c1x/HotSpotConstantPool.java @ 2289:6190d20bd6d6
merge
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Mon, 11 Apr 2011 11:25:06 +0200 |
parents | 569d3fe7d65c |
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/* * Copyright (c) 2010 Sun Microsystems, Inc. All rights reserved. * * Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product * that is described in this document. In particular, and without limitation, these intellectual property * rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or * more additional patents or pending patent applications in the U.S. and in other countries. * * U.S. Government Rights - Commercial software. Government users are subject to the Sun * Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its * supplements. * * Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or * registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks * are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the * U.S. and other countries. * * UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open * Company, Ltd. */ package com.sun.hotspot.c1x; import java.io.*; import java.util.*; import com.sun.cri.ri.*; /** * Implementation of RiConstantPool for HotSpot. * * @author Thomas Wuerthinger, Lukas Stadler */ 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; } }