ASM constant pool sorter

ConstantPoolSortingClassWriter.java

/***
 * Copyright (c) 2015 Jeffrey Bosboom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.objectweb.asm;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;

/**
 * Sorts the constant pool most-used-first to minimize the number of ldc_w
 * instructions (and thus the class file size).  Edit sortItems to implement a
 * different sort order.
 * <p/>
 * Example usage:
 * <p><blockquote><pre>
 *     byte[] inputBytes = ...;
 *     ClassReader cr = new ClassReader(inputBytes);
 *     ConstantPoolSortingClassWriter cw = new ConstantPoolSortingClassWriter(0);
 *     ConstantHistogrammer ch = new ConstantHistogrammer(cw);
 *     ClassVisitor s = new SomeOtherClassVisitor(ch);
 *     cr.accept(s, 0);
 *     byte[] outputBytes = cw.toByteArray();
 * </pre></blockquote></p>
 * @author Jeffrey Bosboom
 * @see <a href="http://stackoverflow.com/q/29079192/3614835">How can I control the order of constant pool entries using ASM?</a> on Stack Overflow
 */
public class ConstantPoolSortingClassWriter extends ClassWriter {
	private final int flags;
	Map<Item, Integer> constantHistogram; //initialized by ConstantHistogrammer
	public ConstantPoolSortingClassWriter(int flags) {
		super(flags);
		this.flags = flags;
	}

	@Override
	public byte[] toByteArray() {
		byte[] bytes = super.toByteArray();

		List<Item> cst = new ArrayList<>();
		for (Item i : items)
			for (Item j = i; j != null; j = j.next) {
				//exclude ASM's internal bookkeeping
				if (j.type == TYPE_NORMAL || j.type == TYPE_UNINIT ||
						j.type == TYPE_MERGED || j.type == BSM)
					continue;
				if (j.type == CLASS)
					j.intVal = 0; //for ASM's InnerClesses tracking
				cst.add(j);
			}

		sortItems(cst);

		ClassWriter target = new ClassWriter(flags);
		//ClassWriter.put is private, so we have to do the insert manually
		//we don't bother resizing the hashtable
		for (int i = 0; i < cst.size(); ++i) {
			Item item = cst.get(i);
			item.index = target.index++;
			if (item.type == LONG || item.type == DOUBLE)
				target.index++;
			int hash = item.hashCode % target.items.length;
			item.next = target.items[hash];
			target.items[hash] = item;
		}

		//because we didn't call newFooItem, we need to manually write pool bytes
		//we can call newFoo to find existing items, though
		for (Item i : cst) {
			if (i.type == UTF8)
				target.pool.putByte(UTF8).putUTF8(i.strVal1);
			if (i.type == CLASS || i.type == MTYPE || i.type == STR)
				target.pool.putByte(i.type).putShort(target.newUTF8(i.strVal1));
			if (i.type == IMETH || i.type == METH || i.type == FIELD)
				target.pool.putByte(i.type).putShort(target.newClass(i.strVal1)).putShort(target.newNameType(i.strVal2, i.strVal3));
			if (i.type == INT || i.type == FLOAT)
				target.pool.putByte(i.type).putInt(i.intVal);
			if (i.type == LONG || i.type == DOUBLE)
				target.pool.putByte(i.type).putLong(i.longVal);
			if (i.type == NAME_TYPE)
				target.pool.putByte(i.type).putShort(target.newUTF8(i.strVal1)).putShort(target.newUTF8(i.strVal2));
			if (i.type >= HANDLE_BASE && i.type < TYPE_NORMAL) {
				int tag = i.type - HANDLE_BASE;
				if (tag <= Opcodes.H_PUTSTATIC)
					target.pool.putByte(HANDLE).putByte(tag).putShort(target.newField(i.strVal1, i.strVal2, i.strVal3));
				else
					target.pool.putByte(HANDLE).putByte(tag).putShort(target.newMethod(i.strVal1, i.strVal2, i.strVal3, tag == Opcodes.H_INVOKEINTERFACE));
			}
			if (i.type == INDY)
				target.pool.putByte(INDY).putShort((int)i.longVal).putShort(target.newNameType(i.strVal1, i.strVal2));
		}

		//parse and rewrite with the new ClassWriter, constants presorted
		ClassReader r = new ClassReader(bytes);
		r.accept(target, 0);
		return target.toByteArray();
	}

	private void sortItems(List<Item> items) {
		items.forEach(i -> constantHistogram.putIfAbsent(i, 0));
		//constants appearing more often come first, so we use as few ldc_w as possible
		Collections.sort(items, Comparator.comparing(constantHistogram::get).reversed());
	}
}

ConstantHistogrammer.java

/***
 * Copyright (c) 2015 Jeffrey Bosboom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.objectweb.asm;

import java.util.HashMap;
import java.util.Map;

/**
 * Counts uses of 1-entry (ldc-loadable) constants.
 * @author Jeffrey Bosboom
 */
public final class ConstantHistogrammer extends ClassVisitor {
	private final ConstantPoolSortingClassWriter cw;
	private final Map<Item, Integer> constantHistogram = new HashMap<>();
	public ConstantHistogrammer(ConstantPoolSortingClassWriter cw) {
		super(Opcodes.ASM5, cw);
		this.cw = cw;
	}

	@Override
	public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
		return new CollectLDC(super.visitMethod(access, name, desc, signature, exceptions));
	}

	@Override
	public void visitEnd() {
		cw.constantHistogram = constantHistogram;
		super.visitEnd();
	}

	private final class CollectLDC extends MethodVisitor {
		private CollectLDC(MethodVisitor mv) {
			super(Opcodes.ASM5, mv);
		}
		@Override
		public void visitLdcInsn(Object cst) {
			//we only care about things ldc can load
			if (cst instanceof Integer || cst instanceof Float || cst instanceof String ||
					cst instanceof Type || cst instanceof Handle)
				constantHistogram.merge(cw.newConstItem(cst), 1, Integer::sum);
			super.visitLdcInsn(cst);
		}
	}
}

Oracle JDK 8u40 rtjar bytes saved.txt

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   48 sun/security/provider/certpath/DistributionPointFetcher
   48 sun/security/provider/certpath/OCSP
   48 sun/security/util/ECUtil
   48 sun/security/util/UntrustedCertificates
   48 sun/util/locale/LocaleMatcher
   48 sun/util/logging/LoggingSupport
   47 com/sun/corba/se/impl/protocol/CorbaInvocationInfo
   47 java/lang/reflect/Proxy
   43 com/sun/corba/se/impl/naming/cosnaming/TransientNameServer
   43 com/sun/corba/se/impl/orbutil/CacheTable
   43 java/sql/DriverManager
   43 sun/rmi/transport/ObjectTable
27804