/* * Copyright (c) 2018, 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 8200167 8010319 * @summary Test direct and MethodHandle access to interface methods using invokespecial semantics * @comment This must be compiled so invokespecial is used * @compile -XDdisableVirtualizedPrivateInvoke SpecialInterfaceCall.java * @compile SpecialInterfaceCallI4.jasm * @run main/othervm -Xint SpecialInterfaceCall * @run main/othervm -Xbatch -XX:+TieredCompilation -XX:TieredStopAtLevel=1 SpecialInterfaceCall * @run main/othervm -Xbatch -XX:-TieredCompilation SpecialInterfaceCall */ import java.lang.invoke.*; public class SpecialInterfaceCall { interface I1 { default void pub_m() {}; private void priv_m() {}; } interface I2 extends I1 { // This needs to be a public method to avoid access control issues, // but logically we treat it as private and emulate invokespecial // using MethodHandles. default void pub_m() {}; private void priv_m() {}; static void invokeDirect(I2 i) { i.priv_m(); // generates invokespecial } static void invokeSpecialMH(I2 i) throws Throwable { // emulates behaviour of invokeDirect mh_I2_priv_m_from_I2.invokeExact(i); } // special case of invoking an Object method via an interface static void invokeSpecialObjectMH(I2 i) throws Throwable { // emulates invokespecial of I1.toString on i, which resolves // to Object.toString String s = (String) mh_I1_toString_from_I2.invokeExact(i); } // special case of invoking a final Object method via an interface static void invokeSpecialObjectFinalMH(I2 i) throws Throwable { // emulates invokespecial of I1.getClass on i, which resolves // to Object.getClass Class c = (Class) mh_I1_getClass_from_I2.invokeExact(i); } } interface I3 extends I2 { // Must take an I3 here rather than I2 else we get // WrongMethodTypeException: expected (I3)void but found (I2)void // Statically the receiver type is bounded by the caller type. static void invokeSpecialMH(I3 i) throws Throwable { // emulates an invokespecial of ((I2)i).pub_m() mh_I2_pub_m_from_I3.invokeExact(i); } } // This interface acts like I2 but we define directInvoke* methods // that we will rewrite the bytecode of to use invokespecial // (see SpecialInterfaceCallI4.jasm). interface I4 extends I1 { static void invokeDirect(I4 i) { // invokeSpecial Object.toString() throw new Error("Class file for I4 is not overwritten"); } static void invokeDirectFinal(I4 i) { // invokeSpecial Object.getClass() - final method throw new Error("Class file for I4 is not overwritten"); } } // Concrete classes static class C1 implements I1 { } static class C2 implements I2 { } static class C3 implements I3 { } static class C4 implements I4 { } // Classes that don't implement I2/I3 but do have a // priv_m/pub_m method in their hierarchy static class D1 implements I1 { } static class E { public void pub_m() {} private void priv_m() {} } // This MH acts like the direct invokespecial in I2.invokeDirect static final MethodHandle mh_I2_priv_m_from_I2; // This MH acts like an invokespecial of I2.pub_m from I3 static final MethodHandle mh_I2_pub_m_from_I3; // This MH acts likes an invokespecial of I1.toString from I2 static final MethodHandle mh_I1_toString_from_I2; // This MH acts likes an invokespecial of I1.getClass from I2 static final MethodHandle mh_I1_getClass_from_I2; static { try { MethodType mt = MethodType.methodType(void.class); MethodHandles.Lookup lookup = MethodHandles.lookup(); mh_I2_priv_m_from_I2 = lookup.findSpecial(I2.class, "priv_m", mt, I2.class); mh_I2_pub_m_from_I3 = lookup.findSpecial(I2.class, "pub_m", mt, I3.class); mt = MethodType.methodType(String.class); mh_I1_toString_from_I2 = lookup.findSpecial(I1.class, "toString", mt, I2.class); mt = MethodType.methodType(Class.class); mh_I1_getClass_from_I2 = lookup.findSpecial(I1.class, "getClass", mt, I2.class); } catch (Throwable e) { throw new Error(e); } } static void runPositiveTests() { shouldNotThrow(() -> I2.invokeDirect(new C2())); shouldNotThrow(() -> I2.invokeDirect(new C3())); shouldNotThrow(() -> I2.invokeSpecialMH(new C2())); shouldNotThrow(() -> I2.invokeSpecialMH(new C3())); shouldNotThrow(() -> I2.invokeSpecialObjectMH(new C2())); shouldNotThrow(() -> I2.invokeSpecialObjectMH(new C3())); shouldNotThrow(() -> I2.invokeSpecialObjectFinalMH(new C2())); shouldNotThrow(() -> I2.invokeSpecialObjectFinalMH(new C3())); shouldNotThrow(() -> I3.invokeSpecialMH(new C3())); shouldNotThrow(() -> I4.invokeDirect(new C4())); shouldNotThrow(() -> I4.invokeDirectFinal(new C4())); } static void runNegativeTests() { System.out.println("IAE I2.invokeDirect D1"); shouldThrowIAE(() -> I2.invokeDirect(unsafeCastI2(new D1()))); System.out.println("IAE I2.invokeDirect E"); shouldThrowIAE(() -> I2.invokeDirect(unsafeCastI2(new E()))); System.out.println("ICCE I2.invokeMH D1"); shouldThrowICCE(() -> I2.invokeSpecialMH(unsafeCastI2(new D1()))); System.out.println("ICCE I2.invokeMH E"); shouldThrowICCE(() -> I2.invokeSpecialMH(unsafeCastI2(new E()))); System.out.println("ICCE I3.invokeMH D1"); shouldThrowICCE(() -> I3.invokeSpecialMH(unsafeCastI3(new D1()))); System.out.println("ICCE I3.invokeMH E"); shouldThrowICCE(() -> I3.invokeSpecialMH(unsafeCastI3(new E()))); System.out.println("ICCE I3.invokeMH C2"); shouldThrowICCE(() -> I3.invokeSpecialMH(unsafeCastI3(new C2()))); System.out.println("ICCE I4.invokeDirect C1"); shouldThrowIAE(() -> I4.invokeDirect(unsafeCastI4(new C1()))); System.out.println("ICCE I4.invokeDirectFinal C1"); shouldThrowIAE(() -> I4.invokeDirectFinal(unsafeCastI4(new C1()))); System.out.println("ICCE I2.invokeObjectMH C1"); shouldThrowICCE(() -> I2.invokeSpecialObjectMH(unsafeCastI2(new C1()))); System.out.println("ICCE I2.invokeObjectFinalMH C1"); shouldThrowICCE(() -> I2.invokeSpecialObjectFinalMH(unsafeCastI2(new C1()))); } static void warmup() { for (int i = 0; i < 20_000; i++) { runPositiveTests(); } } public static void main(String[] args) throws Throwable { System.out.println("UNRESOLVED:"); runNegativeTests(); runPositiveTests(); System.out.println("RESOLVED:"); runNegativeTests(); System.out.println("WARMUP:"); warmup(); System.out.println("COMPILED:"); runNegativeTests(); runPositiveTests(); } static interface Test { void run() throws Throwable; } static void shouldThrowICCE(Test t) { shouldThrow(IncompatibleClassChangeError.class, "is not a subclass of caller class", t); } static void shouldThrowIAE(Test t) { shouldThrow(IllegalAccessError.class, "must be the current class or a subtype of interface", t); } static void shouldThrow(Class expectedError, String reason, Test t) { try { t.run(); } catch (Throwable e) { if (expectedError.isInstance(e)) { if (e.getMessage().contains(reason)) { // passed System.out.println("Threw expected: " + e); return; } else { throw new AssertionError("Wrong exception reason: expected '" + reason + "', got '" + e.getMessage() + "'", e); } } else { String msg = String.format("Wrong exception thrown: expected=%s; thrown=%s", expectedError.getName(), e.getClass().getName()); throw new AssertionError(msg, e); } } throw new AssertionError("No exception thrown: expected " + expectedError.getName()); } static void shouldNotThrow(Test t) { try { t.run(); // passed } catch (Throwable e) { throw new AssertionError("Exception was thrown: ", e); } } // Note: these unsafe casts are only possible for interface types static I2 unsafeCastI2(Object obj) { try { MethodHandle mh = MethodHandles.identity(Object.class); mh = MethodHandles.explicitCastArguments(mh, mh.type().changeReturnType(I2.class)); return (I2)mh.invokeExact((Object) obj); } catch (Throwable e) { throw new Error(e); } } static I3 unsafeCastI3(Object obj) { try { MethodHandle mh = MethodHandles.identity(Object.class); mh = MethodHandles.explicitCastArguments(mh, mh.type().changeReturnType(I3.class)); return (I3)mh.invokeExact((Object) obj); } catch (Throwable e) { throw new Error(e); } } static I4 unsafeCastI4(Object obj) { try { MethodHandle mh = MethodHandles.identity(Object.class); mh = MethodHandles.explicitCastArguments(mh, mh.type().changeReturnType(I4.class)); return (I4)mh.invokeExact((Object) obj); } catch (Throwable e) { throw new Error(e); } } }