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23 
24 /**
25  * @test
26  * @bug 8008678
27  * @summary JSR 292: constant pool reconstitution must support pseudo strings
28  * @requires vm.jvmti
29  * @library /test/lib
30  * @modules java.base/jdk.internal.misc
31  *          java.instrument
32  *          java.management
33  *          jdk.jartool/sun.tools.jar
34  * @compile -XDignore.symbol.file TestLambdaFormRetransformation.java
35  * @run main TestLambdaFormRetransformation
36  */
37 
38 import java.io.IOException;
39 import java.lang.instrument.ClassFileTransformer;
40 import java.lang.instrument.IllegalClassFormatException;
41 import java.lang.instrument.Instrumentation;
42 import java.lang.instrument.UnmodifiableClassException;
43 import java.nio.file.Files;
44 import java.nio.file.Path;
45 import java.nio.file.Paths;
46 import java.security.ProtectionDomain;
47 import java.util.Arrays;
48 
49 import jdk.test.lib.process.ExitCode;
50 import jdk.test.lib.process.OutputAnalyzer;
51 import jdk.test.lib.process.ProcessTools;
52 
53 public class TestLambdaFormRetransformation {
54     private static String MANIFEST = String.format("Manifest-Version: 1.0\n" +
55                                                    "Premain-Class: %s\n" +
56                                                    "Can-Retransform-Classes: true\n",
57                                                    Agent.class.getName());
58 
59     private static String CP = System.getProperty("test.classes");
60 
main(String args[])61     public static void main(String args[]) throws Throwable {
62         Path agent = TestLambdaFormRetransformation.buildAgent();
63         OutputAnalyzer oa = ProcessTools.executeTestJvm("-javaagent:" +
64                                 agent.toAbsolutePath().toString(), "-version");
65         oa.shouldHaveExitValue(ExitCode.OK.value);
66     }
67 
buildAgent()68     private static Path buildAgent() throws IOException {
69         Path manifest = TestLambdaFormRetransformation.createManifest();
70         Path jar = Files.createTempFile(Paths.get("."), null, ".jar");
71 
72         String[] args = new String[] {
73             "-cfm",
74             jar.toAbsolutePath().toString(),
75             manifest.toAbsolutePath().toString(),
76             "-C",
77             TestLambdaFormRetransformation.CP,
78             Agent.class.getName() + ".class"
79         };
80 
81         sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar");
82 
83         if (!jarTool.run(args)) {
84             throw new Error("jar failed: args=" + Arrays.toString(args));
85         }
86         return jar;
87     }
88 
createManifest()89     private static Path createManifest() throws IOException {
90         Path manifest = Files.createTempFile(Paths.get("."), null, ".mf");
91         byte[] manifestBytes = TestLambdaFormRetransformation.MANIFEST.getBytes();
92         Files.write(manifest, manifestBytes);
93         return manifest;
94     }
95 }
96 
97 class Agent implements ClassFileTransformer {
98     private static Runnable lambda = () -> {
99         System.out.println("I'll crash you!");
100     };
101 
premain(String args, Instrumentation instrumentation)102     public static void premain(String args, Instrumentation instrumentation) {
103         if (!instrumentation.isRetransformClassesSupported()) {
104             System.out.println("Class retransformation is not supported.");
105             return;
106         }
107         System.out.println("Calling lambda to ensure that lambda forms were created");
108 
109         Agent.lambda.run();
110 
111         System.out.println("Registering class file transformer");
112 
113         instrumentation.addTransformer(new Agent());
114 
115         for (Class c : instrumentation.getAllLoadedClasses()) {
116             if (c.getName().contains("LambdaForm") &&
117                 instrumentation.isModifiableClass(c)) {
118                 System.out.format("We've found a modifiable lambda form: %s%n", c.getName());
119                 try {
120                     instrumentation.retransformClasses(c);
121                 } catch (UnmodifiableClassException e) {
122                     throw new AssertionError("Modification of modifiable class " +
123                                              "caused UnmodifiableClassException", e);
124                 }
125             }
126         }
127     }
128 
main(String args[])129     public static void main(String args[]) {
130     }
131 
132     @Override
transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer )133     public byte[] transform(ClassLoader loader,
134                             String className,
135                             Class<?> classBeingRedefined,
136                             ProtectionDomain protectionDomain,
137                             byte[] classfileBuffer
138                            ) throws IllegalClassFormatException {
139         System.out.println("Transforming " + className);
140         return classfileBuffer.clone();
141     }
142 }
143