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/*
* Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* 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).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @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();
}
}
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