8026213: Reflection support for private interface methods

Reviewed-by: forax, psandoz, dholmes, jfranck
Contributed-by: karen.kinnear@oracle.com

src/share/classes/sun/reflect/AccessorGenerator.java

@@ -379,6 +379,10 @@ class AccessorGenerator implements ClassFileConstants {
         return Modifier.isStatic(modifiers);
     }
 
+    protected boolean isPrivate() {
+        return Modifier.isPrivate(modifiers);
+    }
+
     /** Returns class name in "internal" form (i.e., '/' separators
         instead of '.') */
     protected static String getClassName

src/share/classes/sun/reflect/MethodAccessorGenerator.java

@@ -639,10 +639,14 @@ class MethodAccessorGenerator extends AccessorGenerator {
                                     typeSizeInStackSlots(returnType));
             } else {
                 if (isInterface()) {
-                    cb.opc_invokeinterface(targetMethodRef,
-                                           count,
-                                           count,
-                                           typeSizeInStackSlots(returnType));
+                    if (isPrivate()) {
+                        cb.opc_invokespecial(targetMethodRef, count, 0);
+                    } else {
+                        cb.opc_invokeinterface(targetMethodRef,
+                                               count,
+                                               count,
+                                               typeSizeInStackSlots(returnType));
+                    }
                 } else {
                     cb.opc_invokevirtual(targetMethodRef,
                                          count,

test/java/lang/reflect/Method/invoke/TestPrivateInterfaceMethodReflect.java

+/*
+ * Copyright (c) 2013, 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 8026213
+ * @summary Reflection support for private methods in interfaces
+ * @author  Robert Field
+ * @run main TestPrivateInterfaceMethodReflect
+ */
+
+import java.lang.reflect.*;
+
+import jdk.internal.org.objectweb.asm.ClassWriter;
+import jdk.internal.org.objectweb.asm.MethodVisitor;
+import jdk.internal.org.objectweb.asm.Opcodes;
+
+public class TestPrivateInterfaceMethodReflect {
+
+    static final String INTERFACE_NAME = "PrivateInterfaceMethodReflectTest_Interface";
+    static final String CLASS_NAME = "PrivateInterfaceMethodReflectTest_Class";
+    static final int EXPECTED = 1234;
+
+    static class TestClassLoader extends ClassLoader implements Opcodes {
+
+        @Override
+        public Class findClass(String name) throws ClassNotFoundException {
+            byte[] b;
+            try {
+                b = loadClassData(name);
+            } catch (Throwable th) {
+                // th.printStackTrace();
+                throw new ClassNotFoundException("Loading error", th);
+            }
+            return defineClass(name, b, 0, b.length);
+        }
+
+        private byte[] loadClassData(String name) throws Exception {
+            ClassWriter cw = new ClassWriter(0);
+            MethodVisitor mv;
+            switch (name) {
+                case INTERFACE_NAME:
+                    cw.visit(V1_8, ACC_ABSTRACT | ACC_INTERFACE | ACC_PUBLIC, INTERFACE_NAME, null, "java/lang/Object", null);
+                    {
+                        mv = cw.visitMethod(ACC_PRIVATE, "privInstance", "()I", null, null);
+                        mv.visitCode();
+                        mv.visitLdcInsn(EXPECTED);
+                        mv.visitInsn(IRETURN);
+                        mv.visitMaxs(1, 1);
+                        mv.visitEnd();
+                    }
+                    break;
+                case CLASS_NAME:
+                    cw.visit(52, ACC_SUPER | ACC_PUBLIC, CLASS_NAME, null, "java/lang/Object", new String[]{INTERFACE_NAME});
+                    {
+                        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
+                        mv.visitCode();
+                        mv.visitVarInsn(ALOAD, 0);
+                        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
+                        mv.visitInsn(RETURN);
+                        mv.visitMaxs(1, 1);
+                        mv.visitEnd();
+                    }
+                    break;
+                default:
+                    break;
+            }
+            cw.visitEnd();
+
+            return cw.toByteArray();
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        TestClassLoader tcl = new TestClassLoader();
+        Class<?> itf = tcl.loadClass(INTERFACE_NAME);
+        Class<?> k = tcl.loadClass(CLASS_NAME);
+        Object inst = k.newInstance();
+        Method[] meths = itf.getDeclaredMethods();
+        if (meths.length != 1) {
+            throw new Exception("Expected one method in " + INTERFACE_NAME + " instead " + meths.length);
+        }
+
+        Method m = meths[0];
+        int mod = m.getModifiers();
+        if ((mod & Modifier.PRIVATE) == 0) {
+            throw new Exception("Expected " + m + " to be private");
+        }
+        if ((mod & Modifier.STATIC) != 0) {
+            throw new Exception("Expected " + m + " to be instance method");
+        }
+
+        m.setAccessible(true);
+        for (int i = 1; i < 200; i++) {
+            if (!m.invoke(inst).equals(EXPECTED)) {
+                throw new Exception("Expected " + EXPECTED + " from " + m);
+            }
+        }
+
+        System.out.println("Passed.");
+    }
+}