1/*
2 * Copyright (c) 2015, 2016, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/**
25 * @test
26 * @bug 8008678
27 * @summary JSR 292: constant pool reconstitution must support pseudo strings
28 * @library /test/lib
29 * @modules java.base/jdk.internal.misc
30 *          java.instrument
31 *          java.management
32 *          jdk.jartool/sun.tools.jar
33 * @compile -XDignore.symbol.file TestLambdaFormRetransformation.java
34 * @run main TestLambdaFormRetransformation
35 */
36
37import java.io.IOException;
38import java.lang.instrument.ClassFileTransformer;
39import java.lang.instrument.IllegalClassFormatException;
40import java.lang.instrument.Instrumentation;
41import java.lang.instrument.UnmodifiableClassException;
42import java.nio.file.Files;
43import java.nio.file.Path;
44import java.nio.file.Paths;
45import java.security.ProtectionDomain;
46import java.util.Arrays;
47
48import jdk.test.lib.process.ExitCode;
49import jdk.test.lib.process.OutputAnalyzer;
50import jdk.test.lib.process.ProcessTools;
51
52public class TestLambdaFormRetransformation {
53    private static String MANIFEST = String.format("Manifest-Version: 1.0\n" +
54                                                   "Premain-Class: %s\n" +
55                                                   "Can-Retransform-Classes: true\n",
56                                                   Agent.class.getName());
57
58    private static String CP = System.getProperty("test.classes");
59
60    public static void main(String args[]) throws Throwable {
61        Path agent = TestLambdaFormRetransformation.buildAgent();
62        OutputAnalyzer oa = ProcessTools.executeTestJvm("-javaagent:" +
63                                agent.toAbsolutePath().toString(), "-version");
64        oa.shouldHaveExitValue(ExitCode.OK.value);
65    }
66
67    private static Path buildAgent() throws IOException {
68        Path manifest = TestLambdaFormRetransformation.createManifest();
69        Path jar = Files.createTempFile(Paths.get("."), null, ".jar");
70
71        String[] args = new String[] {
72            "-cfm",
73            jar.toAbsolutePath().toString(),
74            manifest.toAbsolutePath().toString(),
75            "-C",
76            TestLambdaFormRetransformation.CP,
77            Agent.class.getName() + ".class"
78        };
79
80        sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar");
81
82        if (!jarTool.run(args)) {
83            throw new Error("jar failed: args=" + Arrays.toString(args));
84        }
85        return jar;
86    }
87
88    private static Path createManifest() throws IOException {
89        Path manifest = Files.createTempFile(Paths.get("."), null, ".mf");
90        byte[] manifestBytes = TestLambdaFormRetransformation.MANIFEST.getBytes();
91        Files.write(manifest, manifestBytes);
92        return manifest;
93    }
94}
95
96class Agent implements ClassFileTransformer {
97    private static Runnable lambda = () -> {
98        System.out.println("I'll crash you!");
99    };
100
101    public static void premain(String args, Instrumentation instrumentation) {
102        if (!instrumentation.isRetransformClassesSupported()) {
103            System.out.println("Class retransformation is not supported.");
104            return;
105        }
106        System.out.println("Calling lambda to ensure that lambda forms were created");
107
108        Agent.lambda.run();
109
110        System.out.println("Registering class file transformer");
111
112        instrumentation.addTransformer(new Agent());
113
114        for (Class c : instrumentation.getAllLoadedClasses()) {
115            if (c.getName().contains("LambdaForm") &&
116                instrumentation.isModifiableClass(c)) {
117                System.out.format("We've found a modifiable lambda form: %s%n", c.getName());
118                try {
119                    instrumentation.retransformClasses(c);
120                } catch (UnmodifiableClassException e) {
121                    throw new AssertionError("Modification of modifiable class " +
122                                             "caused UnmodifiableClassException", e);
123                }
124            }
125        }
126    }
127
128    public static void main(String args[]) {
129    }
130
131    @Override
132    public byte[] transform(ClassLoader loader,
133                            String className,
134                            Class<?> classBeingRedefined,
135                            ProtectionDomain protectionDomain,
136                            byte[] classfileBuffer
137                           ) throws IllegalClassFormatException {
138        System.out.println("Transforming " + className);
139        return classfileBuffer.clone();
140    }
141}
142