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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
* @summary unit tests for java.lang.invoke.MethodHandles
* @library /lib/testlibrary /java/lang/invoke/common
* @compile MethodHandlesTest.java MethodHandlesPermuteArgumentsTest.java remote/RemoteExample.java
* @run junit/othervm/timeout=2500 -XX:+IgnoreUnrecognizedVMOptions
* -XX:-VerifyDependencies
* -esa
* test.java.lang.invoke.MethodHandlesPermuteArgumentsTest
*/
package test.java.lang.invoke;
import org.junit.*;
import test.java.lang.invoke.lib.CodeCacheOverflowProcessor;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.util.Arrays;
import static org.junit.Assert.*;
public class MethodHandlesPermuteArgumentsTest extends MethodHandlesTest {
@Test // SLOW
public void testPermuteArguments() throws Throwable {
CodeCacheOverflowProcessor.runMHTest(this::testPermuteArguments0);
}
public void testPermuteArguments0() throws Throwable {
if (CAN_SKIP_WORKING) return;
startTest("permuteArguments");
testPermuteArguments(4, Integer.class, 2, long.class, 6);
if (CAN_TEST_LIGHTLY) return;
testPermuteArguments(4, Integer.class, 2, String.class, 0);
testPermuteArguments(6, Integer.class, 0, null, 30);
}
public void testPermuteArguments(int max, Class<?> type1, int t2c, Class<?> type2, int dilution) throws Throwable {
if (verbosity >= 2)
System.out.println("permuteArguments "+max+"*"+type1.getName()
+(t2c==0?"":"/"+t2c+"*"+type2.getName())
+(dilution > 0 ? " with dilution "+dilution : ""));
int t2pos = t2c == 0 ? 0 : 1;
for (int inargs = t2pos+1; inargs <= max; inargs++) {
Class<?>[] types = new Class<?>[inargs];
Arrays.fill(types, type1);
if (t2c != 0) {
// Fill in a middle range with type2:
Arrays.fill(types, t2pos, Math.min(t2pos+t2c, inargs), type2);
}
Object[] args = randomArgs(types);
int numcases = 1;
for (int outargs = 0; outargs <= max; outargs++) {
if (outargs - inargs >= MAX_ARG_INCREASE) continue;
int casStep = dilution + 1;
// Avoid some common factors:
while ((casStep > 2 && casStep % 2 == 0 && inargs % 2 == 0) ||
(casStep > 3 && casStep % 3 == 0 && inargs % 3 == 0))
casStep++;
testPermuteArguments(args, types, outargs, numcases, casStep);
numcases *= inargs;
if (CAN_TEST_LIGHTLY && outargs < max-2) continue;
if (dilution > 10 && outargs >= 4) {
if (CAN_TEST_LIGHTLY) continue;
int[] reorder = new int[outargs];
// Do some special patterns, which we probably missed.
// Replication of a single argument or argument pair.
for (int i = 0; i < inargs; i++) {
Arrays.fill(reorder, i);
testPermuteArguments(args, types, reorder);
for (int d = 1; d <= 2; d++) {
if (i + d >= inargs) continue;
for (int j = 1; j < outargs; j += 2)
reorder[j] += 1;
testPermuteArguments(args, types, reorder);
testPermuteArguments(args, types, reverse(reorder));
}
}
// Repetition of a sequence of 3 or more arguments.
for (int i = 1; i < inargs; i++) {
for (int len = 3; len <= inargs; len++) {
for (int j = 0; j < outargs; j++)
reorder[j] = (i + (j % len)) % inargs;
testPermuteArguments(args, types, reorder);
testPermuteArguments(args, types, reverse(reorder));
}
}
}
}
}
}
public void testPermuteArguments(Object[] args, Class<?>[] types,
int outargs, int numcases, int casStep) throws Throwable {
int inargs = args.length;
int[] reorder = new int[outargs];
for (int cas = 0; cas < numcases; cas += casStep) {
for (int i = 0, c = cas; i < outargs; i++) {
reorder[i] = c % inargs;
c /= inargs;
}
if (CAN_TEST_LIGHTLY && outargs >= 3 &&
(reorder[0] == reorder[1] || reorder[1] == reorder[2]))
continue;
testPermuteArguments(args, types, reorder);
}
}
static int[] reverse(int[] reorder) {
reorder = reorder.clone();
for (int i = 0, imax = reorder.length / 2; i < imax; i++) {
int j = reorder.length - 1 - i;
int tem = reorder[i];
reorder[i] = reorder[j];
reorder[j] = tem;
}
return reorder;
}
void testPermuteArguments(Object[] args, Class<?>[] types, int[] reorder) throws Throwable {
countTest();
if (args == null && types == null) {
int max = 0;
for (int j : reorder) {
if (max < j) max = j;
}
args = randomArgs(max+1, Integer.class);
}
if (args == null) {
args = randomArgs(types);
}
if (types == null) {
types = new Class<?>[args.length];
for (int i = 0; i < args.length; i++)
types[i] = args[i].getClass();
}
int inargs = args.length, outargs = reorder.length;
assertTrue(inargs == types.length);
if (verbosity >= 3)
System.out.println("permuteArguments "+Arrays.toString(reorder));
Object[] permArgs = new Object[outargs];
Class<?>[] permTypes = new Class<?>[outargs];
for (int i = 0; i < outargs; i++) {
permArgs[i] = args[reorder[i]];
permTypes[i] = types[reorder[i]];
}
if (verbosity >= 4) {
System.out.println("in args: "+Arrays.asList(args));
System.out.println("out args: "+Arrays.asList(permArgs));
System.out.println("in types: "+Arrays.asList(types));
System.out.println("out types: "+Arrays.asList(permTypes));
}
MethodType inType = MethodType.methodType(Object.class, types);
MethodType outType = MethodType.methodType(Object.class, permTypes);
MethodHandle target = varargsList(outargs).asType(outType);
MethodHandle newTarget = MethodHandles.permuteArguments(target, inType, reorder);
if (verbosity >= 5) System.out.println("newTarget = "+newTarget);
Object result = newTarget.invokeWithArguments(args);
Object expected = Arrays.asList(permArgs);
if (!expected.equals(result)) {
System.out.println("*** failed permuteArguments "+Arrays.toString(reorder)+
" types="+Arrays.asList(types));
System.out.println("in args: "+Arrays.asList(args));
System.out.println("out args: "+expected);
System.out.println("bad args: "+result);
}
assertEquals(expected, result);
}
}
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