russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
77 lines
3.2 KiB
Java
77 lines
3.2 KiB
Java
/*
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* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @summary Creates a hidden class inside of a hidden class.
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* @library /test/lib
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* @modules jdk.compiler
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* @run main p.NestedHidden
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*/
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package p;
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import java.lang.*;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodHandles.Lookup;
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import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*;
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import jdk.test.lib.compiler.InMemoryJavaCompiler;
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// Test that a hidden class can define its own hidden class by calling
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// lookup.defineHiddenClass().
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public class NestedHidden {
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static byte klassbuf[] = InMemoryJavaCompiler.compile("p.TestClass",
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"package p; " +
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"public class TestClass { " +
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" public static void concat(String one, String two) throws Throwable { " +
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" System.out.println(one + two);" +
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" } } ");
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public static void main(String args[]) throws Exception {
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// The hidden class calls lookup.defineHiddenClass(), creating a nested hidden class.
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byte klassbuf2[] = InMemoryJavaCompiler.compile("p.TestClass2",
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"package p; " +
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"import java.lang.invoke.MethodHandles; " +
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"import java.lang.invoke.MethodHandles.Lookup; " +
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"import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*; " +
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"public class TestClass2 { " +
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" public static void doit() throws Throwable { " +
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" Lookup lookup = MethodHandles.lookup(); " +
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" Class<?> klass2 = lookup.defineHiddenClass(p.NestedHidden.klassbuf, true, NESTMATE).lookupClass(); " +
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" Class[] dArgs = new Class[2]; " +
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" dArgs[0] = String.class; " +
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" dArgs[1] = String.class; " +
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" try { " +
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" klass2.getMethod(\"concat\", dArgs).invoke(null, \"CC\", \"DD\"); " +
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" } catch (Throwable ex) { " +
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" throw new RuntimeException(\"Exception: \" + ex.toString()); " +
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" } " +
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"} } ");
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Lookup lookup = MethodHandles.lookup();
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Class<?> klass2 = lookup.defineHiddenClass(klassbuf2, true, NESTMATE).lookupClass();
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klass2.getMethod("doit").invoke(null);
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}
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}
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