/*
* 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.
*
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* questions.
*/
/*
* @test
* @bug 8035776
* @summary metafactory should fail if impl return does not match sam/bridge returns
*/
import java.lang.invoke.*;
import java.util.Arrays;
import static java.lang.invoke.MethodType.methodType;
public class MetafactorySamReturnTest {
static final MethodHandles.Lookup lookup = MethodHandles.lookup();
public interface I {}
public static class C {
public static void m_void(String arg) {}
public static boolean m_boolean(String arg) { return true; }
public static char m_char(String arg) { return 'x'; }
public static byte m_byte(String arg) { return 12; }
public static short m_short(String arg) { return 12; }
public static int m_int(String arg) { return 12; }
public static long m_long(String arg) { return 12; }
public static float m_float(String arg) { return 12; }
public static double m_double(String arg) { return 12; }
public static String m_String(String arg) { return ""; }
public static Integer m_Integer(String arg) { return 23; }
public static Object m_Object(String arg) { return new Object(); }
public static MethodHandle getMH(Class<?> c) {
try {
return lookup.findStatic(C.class, "m_" + c.getSimpleName(), methodType(c, String.class));
}
catch (NoSuchMethodException | IllegalAccessException e) {
throw new RuntimeException(e);
}
}
}
public static void main(String... args) {
Class<?>[] t = { void.class, boolean.class, char.class,
byte.class, short.class, int.class, long.class, float.class, double.class,
String.class, Integer.class, Object.class };
for (int i = 0; i < t.length; i++) {
MethodHandle mh = C.getMH(t[i]);
for (int j = 0; j < t.length; j++) {
// TEMPORARY EXCEPTIONS
if (t[j] == void.class) continue;
if (t[i].isPrimitive() && t[j] == Object.class) continue;
if (t[i] == char.class && (t[j] == int.class || t[j] == long.class || t[j] == float.class || t[j] == double.class)) continue;
if (t[i] == byte.class && (t[j] == short.class || t[j] == int.class || t[j] == long.class || t[j] == float.class || t[j] == double.class)) continue;
if (t[i] == short.class && (t[j] == int.class || t[j] == long.class || t[j] == float.class || t[j] == double.class)) continue;
if (t[i] == int.class && (t[j] == long.class || t[j] == float.class || t[j] == double.class)) continue;
if (t[i] == long.class && (t[j] == float.class || t[j] == double.class)) continue;
if (t[i] == float.class && t[j] == double.class) continue;
if (t[i] == int.class && t[j] == Integer.class) continue;
if (t[i] == Integer.class && (t[j] == int.class || t[j] == long.class || t[j] == float.class || t[j] == double.class)) continue;
// END TEMPORARY EXCEPTIONS
boolean correct = (t[i].isPrimitive() || t[j].isPrimitive())
? t[i] == t[j]
: t[j].isAssignableFrom(t[i]);
MethodType mti = methodType(t[i], String.class);
MethodType mtiCS = methodType(t[i], CharSequence.class);
MethodType mtj = methodType(t[j], String.class);
MethodType mtjObj = methodType(t[j], Object.class);
test(correct, mh, mti, mtj);
testBridge(correct, mh, mti, mti, mtjObj);
testBridge(correct, mh, mti, mti, mtiCS, mtjObj);
}
}
}
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 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));
}
}
}
}