alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (IsMethodCompilableTest.java)

This example Java source code file (IsMethodCompilableTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

compilerwhiteboxtest, exception, inf, ismethodcompilabletest, override, per_method_recompilation_cutoff, permethodrecompilationcutoff, runtimeexception, testcase, warning

The IsMethodCompilableTest.java Java example source code

/*
 * Copyright (c) 2013, 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 IsMethodCompilableTest
 * @bug 8007270 8006683 8007288 8022832
 * @library /testlibrary /testlibrary/whitebox
 * @build IsMethodCompilableTest
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 * @run main/othervm/timeout=2400 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:CompileCommand=compileonly,TestCase$Helper::* IsMethodCompilableTest
 * @summary testing of WB::isMethodCompilable()
 * @author igor.ignatyev@oracle.com
 */
public class IsMethodCompilableTest extends CompilerWhiteBoxTest {
    /**
     * Value of {@code -XX:PerMethodRecompilationCutoff}
     */
    protected static final long PER_METHOD_RECOMPILATION_CUTOFF;

    static {
        long tmp = Long.parseLong(
                getVMOption("PerMethodRecompilationCutoff", "400"));
        if (tmp == -1) {
            PER_METHOD_RECOMPILATION_CUTOFF = -1 /* Inf */;
        } else {
            PER_METHOD_RECOMPILATION_CUTOFF = 1 + (0xFFFFFFFFL & tmp);
        }
    }

    public static void main(String[] args) throws Exception {
        for (TestCase test : TestCase.values()) {
            new IsMethodCompilableTest(test).runTest();
        }
    }

    public IsMethodCompilableTest(TestCase testCase) {
        super(testCase);
        // to prevent inlining of #method
        WHITE_BOX.testSetDontInlineMethod(method, true);
    }

    /**
     * Tests {@code WB::isMethodCompilable()} by recompilation of tested method
     * 'PerMethodRecompilationCutoff' times and checks compilation status. Also
     * checks that WB::clearMethodState() clears no-compilable flags.
     *
     * @throws Exception if one of the checks fails.
     */
    @Override
    protected void test() throws Exception {
        if (testCase.isOsr && CompilerWhiteBoxTest.MODE.startsWith(
                "compiled ")) {
          System.err.printf("Warning: %s is not applicable in %s%n",
                testCase.name(), CompilerWhiteBoxTest.MODE);
          return;
        }
        if (!isCompilable()) {
            throw new RuntimeException(method + " must be compilable");
        }
        System.out.println("PerMethodRecompilationCutoff = "
                + PER_METHOD_RECOMPILATION_CUTOFF);
        if (PER_METHOD_RECOMPILATION_CUTOFF == -1) {
            System.err.println(
                    "Warning: test is not applicable if PerMethodRecompilationCutoff == Inf");
            return;
        }

        // deoptimize 'PerMethodRecompilationCutoff' times and clear state
        for (long i = 0L, n = PER_METHOD_RECOMPILATION_CUTOFF - 1; i < n; ++i) {
            compileAndDeoptimize();
        }
        if (!testCase.isOsr && !isCompilable()) {
            // in osr test case count of deopt maybe more than iterations
            throw new RuntimeException(method + " is not compilable after "
                    + (PER_METHOD_RECOMPILATION_CUTOFF - 1) + " iterations");
        }
        WHITE_BOX.clearMethodState(method);

        // deoptimize 'PerMethodRecompilationCutoff' + 1 times
        long i;
        for (i = 0L; i < PER_METHOD_RECOMPILATION_CUTOFF
                && isCompilable(); ++i) {
            compileAndDeoptimize();
        }
        if (!testCase.isOsr && i != PER_METHOD_RECOMPILATION_CUTOFF) {
            // in osr test case count of deopt maybe more than iterations
            throw new RuntimeException(method + " is not compilable after "
                    + i + " iterations, but must only after "
                    + PER_METHOD_RECOMPILATION_CUTOFF);
        }
        if (isCompilable()) {
            throw new RuntimeException(method + " is still compilable after "
                    + PER_METHOD_RECOMPILATION_CUTOFF + " iterations");
        }
        compile();
        checkNotCompiled();

        // WB.clearMethodState() must reset no-compilable flags
        WHITE_BOX.clearMethodState(method);
        if (!isCompilable()) {
            throw new RuntimeException(method
                    + " is not compilable after clearMethodState()");
        }
        compile();
        checkCompiled();
    }

    private void compileAndDeoptimize() throws Exception {
        compile();
        waitBackgroundCompilation();
        deoptimize();
    }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java IsMethodCompilableTest.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.