/*
* Copyright (c) 2014, 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 8035776
* @summary metafactory should fail if arities are mismatched
*/
import java.lang.invoke.*;
import java.util.Arrays;
import static java.lang.invoke.MethodType.methodType;
public class MetafactoryArityTest {
public interface I {}
public static class C { public static String m(int arg) { return ""; } }
static final MethodHandles.Lookup lookup = MethodHandles.lookup();
static final Class<?>[] capInt = { int.class };
static final MethodHandle C_m;
static {
try { C_m = lookup.findStatic(C.class, "m", methodType(String.class, int.class)); }
catch (NoSuchMethodException | IllegalAccessException e) { throw new RuntimeException(e); }
}
public static void main(String... args) {
MethodType unary = methodType(String.class, int.class);
MethodType nullary = methodType(String.class);
MethodType binary = methodType(String.class, int.class, int.class);
MethodType unaryCS = methodType(CharSequence.class, int.class);
MethodType nullaryCS = methodType(CharSequence.class);
MethodType binaryCS = methodType(CharSequence.class, int.class, int.class);
MethodType unaryObj = methodType(Object.class, int.class);
MethodType nullaryObj = methodType(Object.class);
MethodType binaryObj = methodType(Object.class, int.class, int.class);
test(true, C_m, unary, unary);
test(false, C_m, unary, nullary);
test(false, C_m, nullary, unary);
test(false, C_m, unary, binary);
test(false, C_m, binary, unary);
testBridge(true, C_m, unary, unary, unaryCS);
testBridge(false, C_m, unary, unary, nullaryCS);
testBridge(false, C_m, unary, unary, binaryCS);
testBridge(true, C_m, unary, unary, unaryCS, unaryObj);
testBridge(false, C_m, unary, unary, unaryCS, nullaryObj);
testBridge(false, C_m, unary, unary, unaryCS, binaryObj);
testCapture(true, C_m, capInt, nullary, nullary);
testCapture(false, C_m, capInt, binary, binary);
testCapture(false, C_m, capInt, nullary, unary);
testCapture(false, C_m, capInt, nullary, binary);
testCapture(false, C_m, capInt, unary, nullary);
testCapture(false, C_m, capInt, unary, binary);
testCaptureBridge(true, C_m, capInt, nullary, nullary, nullaryCS);
testCaptureBridge(false, C_m, capInt, unary, unary, unaryCS);
testCaptureBridge(false, C_m, capInt, nullary, nullary, unaryCS);
testCaptureBridge(false, C_m, capInt, nullary, nullary, binaryCS);
testCaptureBridge(true, C_m, capInt, nullary, nullary, nullaryCS, nullaryObj);
testCaptureBridge(false, C_m, capInt, unary, unary, unaryCS, unaryObj);
testCaptureBridge(false, C_m, capInt, nullary, nullary, nullaryCS, unaryObj);
testCaptureBridge(false, C_m, capInt, nullary, nullary, nullaryCS, binaryObj);
}
static void test(boolean correct, MethodHandle mh, MethodType instMT, MethodType samMT) {
tryMetafactory(correct, mh, new Class<?>[]{}, instMT, samMT);
tryAltMetafactory(correct, mh, new Class<?>[]{}, instMT, samMT);
}
static void testBridge(boolean correct, MethodHandle mh, MethodType instMT, MethodType samMT, MethodType... bridgeMTs) {
tryAltMetafactory(correct, mh, new Class<?>[]{}, instMT, samMT, bridgeMTs);
}
static void testCapture(boolean correct, MethodHandle mh, Class<?>[] captured, MethodType instMT, MethodType samMT) {
tryMetafactory(correct, mh, captured, instMT, samMT);
tryAltMetafactory(correct, mh, captured, instMT, samMT);
}
static void testCaptureBridge(boolean correct, MethodHandle mh, Class<?>[] captured,
MethodType instMT, MethodType samMT, MethodType... bridgeMTs) {
tryAltMetafactory(correct, mh, captured, instMT, samMT, bridgeMTs);
}
static void tryMetafactory(boolean correct, MethodHandle mh, Class<?>[] captured,
MethodType instMT, MethodType samMT) {
try {
LambdaMetafactory.metafactory(lookup, "run", methodType(I.class, captured),
samMT, mh, instMT);
if (!correct) {
throw new AssertionError("Uncaught linkage error:" +
" impl=" + mh +
", captured=" + Arrays.toString(captured) +
", inst=" + instMT +
", sam=" + samMT);
}
}
catch (LambdaConversionException e) {
if (correct) {
throw new AssertionError("Unexpected linkage error:" +
" e=" + e +
", impl=" + mh +
", captured=" + Arrays.toString(captured) +
", inst=" + instMT +
", sam=" + samMT);
}
}
}
static void tryAltMetafactory(boolean correct, MethodHandle mh, Class<?>[] captured,
MethodType instMT, MethodType samMT, MethodType... bridgeMTs) {
boolean bridge = bridgeMTs.length > 0;
Object[] args = new Object[bridge ? 5+bridgeMTs.length : 4];
args[0] = samMT;
args[1] = mh;
args[2] = instMT;
args[3] = bridge ? LambdaMetafactory.FLAG_BRIDGES : 0;
if (bridge) {
args[4] = bridgeMTs.length;
for (int i = 0; i < bridgeMTs.length; i++) args[5+i] = bridgeMTs[i];
}
try {
LambdaMetafactory.altMetafactory(lookup, "run", methodType(I.class, captured), args);
if (!correct) {
throw new AssertionError("Uncaught linkage error:" +
" impl=" + mh +
", captured=" + Arrays.toString(captured) +
", inst=" + instMT +
", sam=" + samMT +
", bridges=" + Arrays.toString(bridgeMTs));
}
}
catch (LambdaConversionException e) {
if (correct) {
throw new AssertionError("Unexpected linkage error:" +
" e=" + e +
", impl=" + mh +
", captured=" + Arrays.toString(captured) +
", inst=" + instMT +
", sam=" + samMT +
", bridges=" + Arrays.toString(bridgeMTs));
}
}
}
}