1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import jdk.experimental.value.MethodHandleBuilder; 25 import jdk.experimental.value.ValueType; 26 import org.testng.annotations.Test; 27 28 import java.lang.invoke.MethodHandle; 29 import java.lang.invoke.MethodHandles; 30 import java.lang.invoke.MethodType; 31 32 import static org.testng.Assert.*; 33 34 /* 35 * @test 36 * @run testng/othervm -XX:+EnableMVT -Dvalhalla.enablePoolPatches=true WithFieldTest 37 */ 38 39 @Test 40 public class WithFieldTest { 41 42 static final ValueType<?> VT_Point = ValueType.forClass(Point.class); 43 44 static final ValueType<?> VT_PrivatePoint = ValueType.forClass(PrivatePoint.class); 45 46 static final MethodHandle MH_Point_get_x; 47 48 static final MethodHandle MH_PrivatePoint_get_x; 49 50 static { 51 try { 52 MH_Point_get_x = MethodHandles.lookup().findGetter( 53 Point.class, "x", int.class); 54 MH_PrivatePoint_get_x = MethodHandles.lookup().findVirtual( 55 PrivatePoint.class, "getX", MethodType.methodType(int.class)); 56 } catch (Exception e) { 57 throw new InternalError(e); 58 } 59 } 60 61 62 public void testPrivateLookupPrivateFieldUsingVCC() throws Throwable { 63 testPrivateAccess(VT_PrivatePoint, VT_PrivatePoint.boxClass(), MethodHandles.lookup(), MH_PrivatePoint_get_x); 64 } 65 66 public void testPrivateLookupPublicFieldUsingVCC() throws Throwable { 67 testPrivateAccess(VT_Point, VT_Point.boxClass(), MethodHandles.lookup(), MH_Point_get_x); 68 } 69 70 public void testPrivateLookupPrivateFieldUsingDVT() throws Throwable { 71 testPrivateAccess(VT_PrivatePoint, VT_PrivatePoint.valueClass(), MethodHandles.lookup(), MH_PrivatePoint_get_x); 72 } 73 74 public void testPrivateLookupPublicFieldUsingDVT() throws Throwable { 75 testPrivateAccess(VT_Point, VT_Point.valueClass(), MethodHandles.lookup(), MH_Point_get_x); 76 } 77 78 79 @Test(expectedExceptions = IllegalAccessError.class) 80 public void testLookupPrivateFieldUsingVCC() throws Throwable { 81 testAccess(VT_PrivatePoint, MethodHandles.lookup(), MH_PrivatePoint_get_x); 82 } 83 84 @Test(expectedExceptions = IllegalAccessError.class) 85 public void testLookupPublicFieldUsingVCC() throws Throwable { 86 testAccess(VT_Point, MethodHandles.lookup(), MH_Point_get_x); 87 } 88 89 @Test(expectedExceptions = IllegalAccessError.class) 90 public void testLookupPrivateFieldUsingDVT() throws Throwable { 91 testAccess(VT_PrivatePoint, MethodHandles.lookup(), MH_PrivatePoint_get_x); 92 } 93 94 @Test(expectedExceptions = IllegalAccessError.class) 95 public void testLookupPublicFieldUsingDVT() throws Throwable { 96 testAccess(VT_Point, MethodHandles.lookup(), MH_Point_get_x); 97 } 98 99 100 static void testPrivateAccess(ValueType<?> vt, Class<?> lc, MethodHandles.Lookup l, MethodHandle getter) throws Throwable { 101 testAccess(vt, MethodHandles.privateLookupIn(lc, l), getter); 102 } 103 104 static void testAccess(ValueType<?> vt, MethodHandles.Lookup l, MethodHandle getter) throws Throwable { 105 MethodHandle mh = MethodHandles.collectArguments(vwithfield(l, vt, "x", int.class), 0, vt.defaultValueConstant()); 106 107 mh = MethodHandles.filterReturnValue(mh, vt.box()); 108 109 mh = MethodHandles.filterReturnValue(mh, getter); 110 111 int actual = (int) mh.invoke(42); 112 assertEquals(actual, 42); 113 } 114 115 static MethodHandle vwithfield(MethodHandles.Lookup lookup, ValueType<?> vt, String name, Class<?> type) { 116 Class<?> dvt = vt.valueClass(); 117 return MethodHandleBuilder.loadCode( 118 lookup, 119 lookup.lookupClass().toString() + "_wither$" + name, 120 MethodType.methodType(dvt, dvt, type), 121 C -> C.vload(0).load(1).vwithfield(dvt, name, fieldDescriptor(type)).vreturn()); 122 } 123 124 static String fieldDescriptor(Class<?> type) { 125 String s = MethodType.methodType(type).toMethodDescriptorString(); 126 return s.substring(2); 127 } 128 129 }