test/hotspot/jtreg/vmTestbase/nsk/jvmti/ClassFileLoadHook/classfloadhk003.java

/*
 * Copyright (c) 2003, 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.
 */

package nsk.jvmti.ClassFileLoadHook;

import java.io.*;

import nsk.share.*;
import nsk.share.jvmti.*;

/**
 * Debuggee class of JVMTI test.
 */
public class classfloadhk003 extends DebugeeClass {

    /** Load native library if required. */
    static {
        System.loadLibrary("classfloadhk003");
    }

    /** Run test from command line. */
    public static void main(String argv[]) {
        argv = nsk.share.jvmti.JVMTITest.commonInit(argv);

        // JCK-compatible exit
        System.exit(run(argv, System.out) + Consts.JCK_STATUS_BASE);
    }

    /** Run test from JCK-compatible environment. */
    public static int run(String argv[], PrintStream out) {
        return new classfloadhk003().runIt(argv, out);
    }

    /* =================================================================== */

    /* constant names */
    public static final String PACKAGE_NAME = "nsk.jvmti.ClassFileLoadHook";
    public static final String TESTED_CLASS_NAME = PACKAGE_NAME + ".classfloadhk003r";

    /* scaffold objects */
    ArgumentHandler argHandler = null;
    Log log = null;
    long timeout = 0;
    int status = Consts.TEST_PASSED;

    /* bytecode of loaded class */
    public static byte origClassBytes[] = null;

    /* class loader for loaded class */
    public static classfloadhk003ClassLoader classLoader = null;

    /** Run debuggee code. */
    public int runIt(String argv[], PrintStream out) {
        argHandler = new ArgumentHandler(argv);
        log = new Log(out, argHandler);
        timeout = argHandler.getWaitTime() * 60 * 1000; // milliseconds

        String args[] = argHandler.getArguments();
        if (args.length <= 0) {
            throw new Failure("Path for tested class file to load not specified");
        }

        String location = args[0];
        String path = location + File.separator + "loadclass";
        log.display("Using path to original tested class: \n\t" + path);

        classLoader = new classfloadhk003ClassLoader(path);

        log.display("Reading original bytecode of tested class: \n\t" + TESTED_CLASS_NAME);
        try {
            origClassBytes = classLoader.readBytes(path, TESTED_CLASS_NAME);
        } catch (IOException e) {
            throw new Failure("IOException in reading bytecode of tested class file:\n\t" + e);
        }

        log.display("Sync: debugee ready to load tested class");
        status = checkStatus(status);

        try {
            log.display("Loading tested class: " + TESTED_CLASS_NAME);
            Class<?> testedClass = Class.forName(TESTED_CLASS_NAME, true, classLoader);
        } catch (ClassNotFoundException e) {
            throw new Failure("Tested class not found: \n\t" + e);
        }

        log.display("Sync: tested class loaded");
        status = checkStatus(status);

        return status;
    }
}

/* =================================================================== */

/** Classloader for tested class. */
class classfloadhk003ClassLoader extends ClassLoader {
    private String path;

    /** Make classloader providing path to class files. */
    public classfloadhk003ClassLoader(String path) {
        this.path = path;
    }

    /** Load specified class. */
    protected Class<?> findClass(String name) throws ClassNotFoundException {
        try {
            byte[] bytes = readBytes(path, name);
            return defineClass(name, bytes, 0, bytes.length);
        } catch (IOException e) {
            throw new ClassNotFoundException("IOException in loading class: " + name, e);
        }
    }

    /** Read classfile for specified path and class name. */
    public static byte[] readBytes(String path, String classname) throws IOException {
        String filename = path + File.separator
                                + classname.replace('.', File.separatorChar) + ".class";
        FileInputStream in = new FileInputStream(filename);
        byte[] bytes = new byte[in.available()];
        in.read(bytes);
        in.close();
        return bytes;
    }
}