1 /* 2 * Copyright (c) 2018, 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 /** 25 * @test 26 * @bug 8200167 8010319 27 * @summary Test direct and MethodHandle access to interface methods using invokespecial semantics 28 * @comment This must be compiled so invokespecial is used 29 * @compile -XDdisableVirtualizedPrivateInvoke SpecialInterfaceCall.java 30 * @compile SpecialInterfaceCallI4.jasm 31 * @run main/othervm -Xint SpecialInterfaceCall 32 * @run main/othervm -Xbatch -XX:+TieredCompilation -XX:TieredStopAtLevel=1 SpecialInterfaceCall 33 * @run main/othervm -Xbatch -XX:-TieredCompilation SpecialInterfaceCall 34 */ 35 36 import java.lang.invoke.*; 37 38 public class SpecialInterfaceCall { 39 interface I1 { 40 default void pub_m() {}; 41 private void priv_m() {}; 42 } 43 interface I2 extends I1 { 44 // This needs to be a public method to avoid access control issues, 45 // but logically we treat it as private and emulate invokespecial 46 // using MethodHandles. 47 default void pub_m() {}; 48 49 private void priv_m() {}; 50 51 static void invokeDirect(I2 i) { 52 i.priv_m(); // generates invokespecial 53 } 54 static void invokeSpecialMH(I2 i) throws Throwable { 55 // emulates behaviour of invokeDirect 56 mh_I2_priv_m_from_I2.invokeExact(i); 57 } 58 // special case of invoking an Object method via an interface 59 static void invokeSpecialObjectMH(I2 i) throws Throwable { 60 // emulates invokespecial of I1.toString on i, which resolves 61 // to Object.toString 62 String s = (String) mh_I1_toString_from_I2.invokeExact(i); 63 } 64 // special case of invoking a final Object method via an interface 65 static void invokeSpecialObjectFinalMH(I2 i) throws Throwable { 66 // emulates invokespecial of I1.getClass on i, which resolves 67 // to Object.getClass 68 Class<?> c = (Class<?>) mh_I1_getClass_from_I2.invokeExact(i); 69 } 70 } 71 interface I3 extends I2 { 72 // Must take an I3 here rather than I2 else we get 73 // WrongMethodTypeException: expected (I3)void but found (I2)void 74 // Statically the receiver type is bounded by the caller type. 75 static void invokeSpecialMH(I3 i) throws Throwable { 76 // emulates an invokespecial of ((I2)i).pub_m() 77 mh_I2_pub_m_from_I3.invokeExact(i); 78 } 79 } 80 // This interface acts like I2 but we define directInvoke* methods 81 // that we will rewrite the bytecode of to use invokespecial 82 // (see SpecialInterfaceCallI4.jasm). 83 interface I4 extends I1 { 84 static void invokeDirect(I4 i) { 85 // invokeSpecial Object.toString() 86 throw new Error("Class file for I4 is not overwritten"); 87 } 88 static void invokeDirectFinal(I4 i) { 89 // invokeSpecial Object.getClass() - final method 90 throw new Error("Class file for I4 is not overwritten"); 91 } 92 } 93 94 // Concrete classes 95 static class C1 implements I1 { } 96 static class C2 implements I2 { } 97 static class C3 implements I3 { } 98 static class C4 implements I4 { } 99 100 // Classes that don't implement I2/I3 but do have a 101 // priv_m/pub_m method in their hierarchy 102 static class D1 implements I1 { } 103 static class E { 104 public void pub_m() {} 105 private void priv_m() {} 106 } 107 108 // This MH acts like the direct invokespecial in I2.invokeDirect 109 static final MethodHandle mh_I2_priv_m_from_I2; 110 111 // This MH acts like an invokespecial of I2.pub_m from I3 112 static final MethodHandle mh_I2_pub_m_from_I3; 113 114 // This MH acts likes an invokespecial of I1.toString from I2 115 static final MethodHandle mh_I1_toString_from_I2; 116 117 // This MH acts likes an invokespecial of I1.getClass from I2 118 static final MethodHandle mh_I1_getClass_from_I2; 119 120 static { 121 try { 122 MethodType mt = MethodType.methodType(void.class); 123 MethodHandles.Lookup lookup = MethodHandles.lookup(); 124 125 mh_I2_priv_m_from_I2 = lookup.findSpecial(I2.class, "priv_m", mt, I2.class); 126 mh_I2_pub_m_from_I3 = lookup.findSpecial(I2.class, "pub_m", mt, I3.class); 127 128 mt = MethodType.methodType(String.class); 129 mh_I1_toString_from_I2 = lookup.findSpecial(I1.class, "toString", mt, I2.class); 130 131 mt = MethodType.methodType(Class.class); 132 mh_I1_getClass_from_I2 = lookup.findSpecial(I1.class, "getClass", mt, I2.class); 133 134 } catch (Throwable e) { 135 throw new Error(e); 136 } 137 } 138 139 static void runPositiveTests() { 140 shouldNotThrow(() -> I2.invokeDirect(new C2())); 141 shouldNotThrow(() -> I2.invokeDirect(new C3())); 142 shouldNotThrow(() -> I2.invokeSpecialMH(new C2())); 143 shouldNotThrow(() -> I2.invokeSpecialMH(new C3())); 144 shouldNotThrow(() -> I2.invokeSpecialObjectMH(new C2())); 145 shouldNotThrow(() -> I2.invokeSpecialObjectMH(new C3())); 146 shouldNotThrow(() -> I2.invokeSpecialObjectFinalMH(new C2())); 147 shouldNotThrow(() -> I2.invokeSpecialObjectFinalMH(new C3())); 148 149 shouldNotThrow(() -> I3.invokeSpecialMH(new C3())); 150 151 shouldNotThrow(() -> I4.invokeDirect(new C4())); 152 shouldNotThrow(() -> I4.invokeDirectFinal(new C4())); 153 } 154 155 static void runNegativeTests() { 156 System.out.println("IAE I2.invokeDirect D1"); 157 shouldThrowIAE(() -> I2.invokeDirect(unsafeCastI2(new D1()))); 158 System.out.println("IAE I2.invokeDirect E"); 159 shouldThrowIAE(() -> I2.invokeDirect(unsafeCastI2(new E()))); 160 System.out.println("ICCE I2.invokeMH D1"); 161 shouldThrowICCE(() -> I2.invokeSpecialMH(unsafeCastI2(new D1()))); 162 System.out.println("ICCE I2.invokeMH E"); 163 shouldThrowICCE(() -> I2.invokeSpecialMH(unsafeCastI2(new E()))); 164 System.out.println("ICCE I3.invokeMH D1"); 165 shouldThrowICCE(() -> I3.invokeSpecialMH(unsafeCastI3(new D1()))); 166 System.out.println("ICCE I3.invokeMH E"); 167 shouldThrowICCE(() -> I3.invokeSpecialMH(unsafeCastI3(new E()))); 168 System.out.println("ICCE I3.invokeMH C2"); 169 shouldThrowICCE(() -> I3.invokeSpecialMH(unsafeCastI3(new C2()))); 170 System.out.println("ICCE I4.invokeDirect C1"); 171 shouldThrowIAE(() -> I4.invokeDirect(unsafeCastI4(new C1()))); 172 System.out.println("ICCE I4.invokeDirectFinal C1"); 173 shouldThrowIAE(() -> I4.invokeDirectFinal(unsafeCastI4(new C1()))); 174 System.out.println("ICCE I2.invokeObjectMH C1"); 175 shouldThrowICCE(() -> I2.invokeSpecialObjectMH(unsafeCastI2(new C1()))); 176 System.out.println("ICCE I2.invokeObjectFinalMH C1"); 177 shouldThrowICCE(() -> I2.invokeSpecialObjectFinalMH(unsafeCastI2(new C1()))); 178 179 } 180 181 static void warmup() { 182 for (int i = 0; i < 20_000; i++) { 183 runPositiveTests(); 184 } 185 } 186 187 public static void main(String[] args) throws Throwable { 188 System.out.println("UNRESOLVED:"); 189 runNegativeTests(); 190 runPositiveTests(); 191 192 System.out.println("RESOLVED:"); 193 runNegativeTests(); 194 195 System.out.println("WARMUP:"); 196 warmup(); 197 198 System.out.println("COMPILED:"); 199 runNegativeTests(); 200 runPositiveTests(); 201 } 202 203 static interface Test { 204 void run() throws Throwable; 205 } 206 207 static void shouldThrowICCE(Test t) { 208 shouldThrow(IncompatibleClassChangeError.class, 209 "is not a subclass of caller class", t); 210 } 211 212 static void shouldThrowIAE(Test t) { 213 shouldThrow(IllegalAccessError.class, 214 "must be the current class or a subtype of interface", t); 215 } 216 217 static void shouldThrow(Class<?> expectedError, String reason, Test t) { 218 try { 219 t.run(); 220 } catch (Throwable e) { 221 if (expectedError.isInstance(e)) { 222 if (e.getMessage().contains(reason)) { 223 // passed 224 System.out.println("Threw expected: " + e); 225 return; 226 } 227 else { 228 throw new AssertionError("Wrong exception reason: expected '" + reason 229 + "', got '" + e.getMessage() + "'", e); 230 } 231 } else { 232 String msg = String.format("Wrong exception thrown: expected=%s; thrown=%s", 233 expectedError.getName(), e.getClass().getName()); 234 throw new AssertionError(msg, e); 235 } 236 } 237 throw new AssertionError("No exception thrown: expected " + expectedError.getName()); 238 } 239 240 static void shouldNotThrow(Test t) { 241 try { 242 t.run(); 243 // passed 244 } catch (Throwable e) { 245 throw new AssertionError("Exception was thrown: ", e); 246 } 247 } 248 249 // Note: these unsafe casts are only possible for interface types 250 251 static I2 unsafeCastI2(Object obj) { 252 try { 253 MethodHandle mh = MethodHandles.identity(Object.class); 254 mh = MethodHandles.explicitCastArguments(mh, mh.type().changeReturnType(I2.class)); 255 return (I2)mh.invokeExact((Object) obj); 256 } catch (Throwable e) { 257 throw new Error(e); 258 } 259 } 260 261 static I3 unsafeCastI3(Object obj) { 262 try { 263 MethodHandle mh = MethodHandles.identity(Object.class); 264 mh = MethodHandles.explicitCastArguments(mh, mh.type().changeReturnType(I3.class)); 265 return (I3)mh.invokeExact((Object) obj); 266 } catch (Throwable e) { 267 throw new Error(e); 268 } 269 } 270 271 static I4 unsafeCastI4(Object obj) { 272 try { 273 MethodHandle mh = MethodHandles.identity(Object.class); 274 mh = MethodHandles.explicitCastArguments(mh, mh.type().changeReturnType(I4.class)); 275 return (I4)mh.invokeExact((Object) obj); 276 } catch (Throwable e) { 277 throw new Error(e); 278 } 279 } 280 }