8046903: VM anonymous class members can't be statically invocable
Reviewed-by: jrose
--- a/jdk/src/share/classes/java/lang/invoke/InvokerBytecodeGenerator.java Tue Jun 17 10:01:16 2014 +0200
+++ b/jdk/src/share/classes/java/lang/invoke/InvokerBytecodeGenerator.java Tue Jun 17 13:06:05 2014 +0400
@@ -40,6 +40,7 @@
import static java.lang.invoke.MethodHandleNatives.Constants.*;
import static java.lang.invoke.LambdaForm.BasicType.*;
import sun.invoke.util.VerifyType;
+import sun.reflect.misc.ReflectUtil;
/**
* Code generation backend for LambdaForm.
@@ -594,6 +595,8 @@
return false; // inner class of some sort
if (cls.getClassLoader() != MethodHandle.class.getClassLoader())
return false; // not on BCP
+ if (ReflectUtil.isVMAnonymousClass(cls)) // FIXME: switch to supported API once it is added
+ return false;
MethodType mtype = member.getMethodOrFieldType();
if (!isStaticallyNameable(mtype.returnType()))
return false;
@@ -612,6 +615,8 @@
cls = cls.getComponentType();
if (cls.isPrimitive())
return true; // int[].class, for example
+ if (ReflectUtil.isVMAnonymousClass(cls)) // FIXME: switch to supported API once it is added
+ return false;
// could use VerifyAccess.isClassAccessible but the following is a safe approximation
if (cls.getClassLoader() != Object.class.getClassLoader())
return false;
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/lang/invoke/VMAnonymousClass.java Tue Jun 17 13:06:05 2014 +0400
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2014, 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
+ * @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 java.lang.reflect.Field;
+import org.junit.Test;
+import sun.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.testSunMisc();
+ test.testJavaLangInvoke();
+ 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 testSunMisc() throws Throwable { test("sun/misc"); }
+ @Test public void testJavaLangInvoke() throws Throwable { test("java/lang/invoke"); }
+
+ private static Unsafe unsafe = getUnsafe();
+
+ private static void test(String pkg) throws Throwable {
+ byte[] bytes = dumpClass(pkg);
+ // Define VM anonymous class in privileged context (on BCP).
+ Class anonClass = unsafe.defineAnonymousClass(Object.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();
+ }
+
+ private static synchronized Unsafe getUnsafe() {
+ try {
+ Field f = Unsafe.class.getDeclaredField("theUnsafe");
+ f.setAccessible(true);
+ return (Unsafe) f.get(null);
+ } catch (NoSuchFieldException | IllegalAccessException e) {
+ throw new RuntimeException("Unable to get Unsafe instance.", e);
+ }
+ }
+}