jdk-24/test/jdk/java/lang/invoke/VMAnonymousClass.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/* @test
 * @bug 8046903
 * @summary VM anonymous class members can't be statically invocable
 * @modules java.base/jdk.internal.misc java.base/jdk.internal.org.objectweb.asm
 * @run junit test.java.lang.invoke.VMAnonymousClass
 */
package test.java.lang.invoke;

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import org.junit.Test;
import jdk.internal.misc.Unsafe;
import jdk.internal.org.objectweb.asm.*;
import static jdk.internal.org.objectweb.asm.Opcodes.*;

public class VMAnonymousClass {
    public static void main(String[] args) throws Throwable {
        VMAnonymousClass test = new VMAnonymousClass();
        test.testJavaLang();
        test.testJavaUtil();
        test.testJdkInternalMisc();
        test.testJavaLangInvoke();
        test.testProhibitedJavaPkg();
        System.out.println("TEST PASSED");
    }

    // Test VM anonymous classes from different packages
    // (see j.l.i.InvokerBytecodeGenerator::isStaticallyInvocable).
    @Test public void testJavaLang()        throws Throwable { test("java/lang");         }
    @Test public void testJavaUtil()        throws Throwable { test("java/util");         }
    @Test public void testJdkInternalMisc() throws Throwable { test("jdk/internal/misc"); }
    @Test public void testJavaLangInvoke()  throws Throwable { test("java/lang/invoke");  }
    @Test public void testProhibitedJavaPkg() throws Throwable {
       try {
           test("java/prohibited");
       } catch (IllegalArgumentException e) {
           return;
       }
       throw new RuntimeException("Expected SecurityException");
     }

    private static Unsafe unsafe = Unsafe.getUnsafe();

    private static void test(String pkg) throws Throwable {
        byte[] bytes = dumpClass(pkg);
        Class host_class;
        if (pkg.equals("java/prohibited")) {
            VMAnonymousClass sampleclass = new VMAnonymousClass();
            host_class = (Class)sampleclass.getClass();
        } else if (pkg.equals("java/lang")) {
          host_class = Object.class;
        } else if (pkg.equals("java/util")) {
            host_class = java.util.ArrayList.class;
        } else if (pkg.equals("jdk/internal/misc")) {
            host_class = jdk.internal.misc.Signal.class;
        } else if (pkg.equals("java/lang/invoke")) {
            host_class = java.lang.invoke.CallSite.class;
        } else {
            throw new RuntimeException("Unexpected pkg: " + pkg);
        }
        // Define VM anonymous class
        Class anonClass = unsafe.defineAnonymousClass(host_class, bytes, null);

        MethodType t = MethodType.methodType(Object.class, int.class);
        MethodHandle target = MethodHandles.lookup().findStatic(anonClass, "get", t);

        // Wrap target into LF (convert) to get "target" referenced from LF
        MethodHandle wrappedMH = target.asType(MethodType.methodType(Object.class, Integer.class));

        // Invoke enough times to provoke LF compilation to bytecode.
        for (int i = 0; i<100; i++) {
            Object r = wrappedMH.invokeExact((Integer)1);
        }
    }

    /*
     * Constructs bytecode for the following class:
     * public class pkg.MyClass {
     *     MyClass() {}
     *     public Object get(int i) { return null; }
     * }
     */
    public static byte[] dumpClass(String pkg) {
        ClassWriter cw = new ClassWriter(0);
        MethodVisitor mv;

        cw.visit(52, ACC_SUPER | ACC_PUBLIC, pkg+"/MyClass", null, "java/lang/Object", null);
        {
            mv = cw.visitMethod(0, "<init>", "()V", null, null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
            mv.visitInsn(RETURN);
            mv.visitMaxs(1, 1);
            mv.visitEnd();
        }
        {
            mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "get", "(I)Ljava/lang/Object;", null, null);
            mv.visitCode();
            mv.visitInsn(ACONST_NULL);
            mv.visitInsn(ARETURN);
            mv.visitMaxs(1, 1);
            mv.visitEnd();
        }
        cw.visitEnd();
        return cw.toByteArray();
    }
}