| /* |
| * Copyright (c) 2016, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 8164102 |
| * @run main/othervm -ea -esa test.java.lang.invoke.CountedLoopIterationCountsTest |
| */ |
| |
| package test.java.lang.invoke; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.invoke.MethodType; |
| |
| public class CountedLoopIterationCountsTest { |
| |
| public static void main(String[] args) throws Throwable { |
| run(1, -10, 0); |
| run(1, 0, 0); |
| run(Integer.MAX_VALUE - 1, Integer.MIN_VALUE + 10, 0); |
| run(Integer.MIN_VALUE, Integer.MIN_VALUE + 4, 4); |
| run(Integer.MAX_VALUE - 2, Integer.MAX_VALUE - 1, 1); |
| run(Integer.MAX_VALUE - 1, 0, 0); |
| run(Integer.MAX_VALUE - 1, 10, 0); |
| run(Integer.MAX_VALUE - 1, -10, 0); |
| run(Integer.MAX_VALUE, Integer.MIN_VALUE + 10, 0); |
| run(Integer.MAX_VALUE - 1, Integer.MAX_VALUE, 1); |
| run(Integer.MAX_VALUE, Integer.MAX_VALUE, 0); |
| |
| if (failed) { |
| throw new AssertionError("one or more tests failed"); |
| } |
| } |
| |
| static boolean failed = false; |
| |
| private static void run(int start, int end, int expectedIterations) throws Throwable { |
| System.out.println("run from " + start + " to " + end); |
| MethodHandle loop = MethodHandles.countedLoop( |
| MethodHandles.constant(int.class, start), // iterate from given start (inclusive) ... |
| MethodHandles.constant(int.class, end), // ... to given end (exclusive) |
| MH_m1, // initialise loop variable to -1 |
| MH_step); // increment loop counter by one in each iteration |
| // The loop variable's value, and hence the loop result, will be "number of iterations" minus one. |
| int r = (int) loop.invoke(); |
| if (r + 1 != expectedIterations) { |
| System.out.println("expected " + expectedIterations + " iterations, but got " + r); |
| failed = true; |
| } |
| } |
| |
| static int step(int stepCount, int counter) { |
| return stepCount + 1; |
| } |
| |
| static final MethodHandle MH_m1; |
| static final MethodHandle MH_step; |
| static { |
| try { |
| MH_m1 = MethodHandles.constant(int.class, -1); |
| MH_step = MethodHandles.lookup().findStatic(CountedLoopIterationCountsTest.class, "step", |
| MethodType.methodType(int.class, int.class, int.class)); |
| } catch (Throwable t) { |
| throw new ExceptionInInitializerError(t); |
| } |
| } |
| |
| } |