8194554: filterArguments runs multiple filters in the wrong order
Reviewed-by: psandoz, jrose
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parent
22762d1cdc
commit
869f9e2ed0
src/java.base/share/classes/java/lang/invoke
test/jdk/java/lang/invoke
@ -3766,6 +3766,7 @@ assertEquals("xy", h3.invoke("x", "y", 1, "a", "b", "c"));
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* specified in the elements of the {@code filters} array.
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* The first element of the filter array corresponds to the {@code pos}
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* argument of the target, and so on in sequence.
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* The filter functions are invoked in left to right order.
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* <p>
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* Null arguments in the array are treated as identity functions,
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* and the corresponding arguments left unchanged.
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@ -3836,11 +3837,12 @@ assertEquals("XY", (String) f2.invokeExact("x", "y")); // XY
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MethodHandle filterArguments(MethodHandle target, int pos, MethodHandle... filters) {
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filterArgumentsCheckArity(target, pos, filters);
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MethodHandle adapter = target;
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int curPos = pos-1; // pre-incremented
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for (MethodHandle filter : filters) {
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curPos += 1;
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// process filters in reverse order so that the invocation of
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// the resulting adapter will invoke the filters in left-to-right order
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for (int i = filters.length - 1; i >= 0; --i) {
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MethodHandle filter = filters[i];
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if (filter == null) continue; // ignore null elements of filters
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adapter = filterArgument(adapter, curPos, filter);
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adapter = filterArgument(adapter, pos + i, filter);
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}
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return adapter;
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}
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132
test/jdk/java/lang/invoke/FilterArgumentsTest.java
Normal file
132
test/jdk/java/lang/invoke/FilterArgumentsTest.java
Normal file
@ -0,0 +1,132 @@
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/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8194554
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* @run testng/othervm test.java.lang.invoke.FilterArgumentsTest
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*/
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package test.java.lang.invoke;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.util.ArrayList;
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import java.util.List;
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import static java.lang.invoke.MethodHandles.*;
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import static java.lang.invoke.MethodType.methodType;
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import org.testng.annotations.*;
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import static org.testng.Assert.*;
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public class FilterArgumentsTest {
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@Test
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public static void testFilterA_B_C() throws Throwable {
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FilterTest test = new FilterTest(
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filterArguments(MH_TEST, 0, MH_FILTER_A, MH_FILTER_B, MH_FILTER_C));
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test.run(List.of("A", "B", "C"));
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}
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@Test
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public static void testFilterA_B() throws Throwable {
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FilterTest test = new FilterTest(
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filterArguments(MH_TEST, 0, MH_FILTER_A, MH_FILTER_B));
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test.run(List.of("A", "B"));
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}
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@Test
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public static void testFilterB_C() throws Throwable {
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FilterTest test = new FilterTest(
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filterArguments(MH_TEST, 1, MH_FILTER_B, MH_FILTER_C));
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test.run(List.of("B", "C"));
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}
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@Test
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public static void testFilterB() throws Throwable {
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FilterTest test = new FilterTest(filterArguments(MH_TEST, 1, MH_FILTER_B));
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test.run(List.of("B"));
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}
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@Test
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public static void testFilterC() throws Throwable {
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FilterTest test = new FilterTest(filterArguments(MH_TEST, 2, MH_FILTER_C));
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test.run(List.of("C"));
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}
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static class FilterTest {
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static List<String> filters = new ArrayList<>();
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final MethodHandle mh;
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FilterTest(MethodHandle mh) {
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this.mh = mh;
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}
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void run(List<String> expected) throws Throwable {
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filters.clear();
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assertEquals("x-0-z", (String)mh.invokeExact("x", 0, 'z'));
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assertEquals(expected, filters);
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}
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static String filterA(String s) {
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filters.add("A");
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return s;
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}
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static int filterB(int value) {
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filters.add("B");
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return value;
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}
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static char filterC(char c) {
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filters.add("C");
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return c;
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}
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static String test(String s, int i, char c) {
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return s + "-" + i + "-" + c;
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}
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}
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static final MethodHandle MH_TEST;
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static final MethodHandle MH_FILTER_A;
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static final MethodHandle MH_FILTER_B;
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static final MethodHandle MH_FILTER_C;
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static final Lookup LOOKUP = MethodHandles.lookup();
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static {
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try {
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MH_TEST = LOOKUP.findStatic(FilterTest.class, "test",
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methodType(String.class, String.class, int.class, char.class));
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MH_FILTER_A = LOOKUP.findStatic(FilterTest.class, "filterA",
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methodType(String.class, String.class));
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MH_FILTER_B = LOOKUP.findStatic(FilterTest.class, "filterB",
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methodType(int.class, int.class));
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MH_FILTER_C = LOOKUP.findStatic(FilterTest.class, "filterC",
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methodType(char.class, char.class));
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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}
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