1 /*
 2  * Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.  Oracle designates this
 8  * particular file as subject to the "Classpath" exception as provided
 9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
23  * questions.
24  */
25 package jdk.incubator.code.bytecode.impl;
26 
27 import java.lang.classfile.ClassFile;
28 import java.lang.classfile.ClassTransform;
29 
30 /**
31  * Applies bytecode compaction passes to a generated class file.
32  * <p>
33  * The generated bytes are parsed first so all compactors work from the final
34  * class-file model, including complete code attributes, stack maps and
35  * exception tables.
36  */
37 public class BytecodeCompactor {
38 
39     /**
40      * Parses and compacts generated class bytes.
41      *
42      * @param classBytes generated class bytes
43      * @return compacted class bytes
44      */
45     public static byte[] transform(byte[] classBytes) {
46         return ClassFile.of().transformClass(ClassFile.of().parse(classBytes),
47                 LocalsCompactor.instance().andThen(ClassTransform.transformingMethodBodies(
48                         new ExceptionTableCompactor().andThen(
49                                 new BranchCompactor()))));
50     }
51 
52 }