1/*
2 * Copyright (c) 2015, 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 */
25package jdk.tools.jlink.internal.plugins;
26
27import java.util.function.Predicate;
28import jdk.internal.org.objectweb.asm.ClassReader;
29import jdk.internal.org.objectweb.asm.ClassWriter;
30import jdk.tools.jlink.plugin.ResourcePool;
31import jdk.tools.jlink.plugin.ResourcePoolBuilder;
32import jdk.tools.jlink.plugin.ResourcePoolEntry;
33import jdk.tools.jlink.plugin.Plugin;
34
35/**
36 *
37 * Strip debug attributes plugin
38 */
39public final class StripDebugPlugin implements Plugin {
40    public static final String NAME = "strip-debug";
41    private final Predicate<String> predicate;
42
43    public StripDebugPlugin() {
44        this((path) -> false);
45    }
46
47    StripDebugPlugin(Predicate<String> predicate) {
48        this.predicate = predicate;
49    }
50
51    @Override
52    public String getName() {
53        return NAME;
54    }
55
56    @Override
57    public String getDescription() {
58        return PluginsResourceBundle.getDescription(NAME);
59    }
60
61    @Override
62    public ResourcePool transform(ResourcePool in, ResourcePoolBuilder out) {
63        //remove *.diz files as well as debug attributes.
64        in.transformAndCopy((resource) -> {
65            ResourcePoolEntry res = resource;
66            if (resource.type().equals(ResourcePoolEntry.Type.CLASS_OR_RESOURCE)) {
67                String path = resource.path();
68                if (path.endsWith(".class")) {
69                    if (path.endsWith("module-info.class")) {
70                        // XXX. Do we have debug info? Is Asm ready for module-info?
71                    } else {
72                        ClassReader reader = new ClassReader(resource.contentBytes());
73                        ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_MAXS);
74                        reader.accept(writer, ClassReader.SKIP_DEBUG);
75                        byte[] content = writer.toByteArray();
76                        res = resource.copyWithContent(content);
77                    }
78                }
79            } else if (predicate.test(res.path())) {
80                res = null;
81            }
82            return res;
83        }, out);
84
85        return out.build();
86    }
87}
88