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