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SpecialInterfaceCall.java
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SpecialInterfaceCall.java
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/*
* 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);
}
}
}