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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 
37 import java.io.IOException;
38 import java.lang.instrument.ClassFileTransformer;
39 import java.lang.instrument.IllegalClassFormatException;
40 import java.lang.instrument.Instrumentation;
41 import java.lang.instrument.UnmodifiableClassException;
42 import java.nio.file.Files;
43 import java.nio.file.Path;
44 import java.nio.file.Paths;
45 import java.security.ProtectionDomain;
46 import java.util.Arrays;
47 
48 import jdk.test.lib.process.ExitCode;
49 import jdk.test.lib.process.OutputAnalyzer;
50 import jdk.test.lib.process.ProcessTools;
51 
52 public 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 
main(String args[])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 
buildAgent()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 
createManifest()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 
96 class Agent implements ClassFileTransformer {
97     private static Runnable lambda = () -> {
98         System.out.println("I'll crash you!");
99     };
100 
premain(String args, Instrumentation instrumentation)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 
main(String args[])128     public static void main(String args[]) {
129     }
130 
131     @Override
transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer )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