/*

 * 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.

 *

 * 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

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 */

package gc.g1.humongousObjects;

import gc.testlibrary.Helpers;

import java.io.IOException;

import java.nio.file.Path;

import java.nio.file.Paths;

/**

 * Generates non-humongous and humongous class loaders.

 * Since the generation depends on current host architecture it cannot be done as part of pre-compilation step

 */

public class ClassLoaderGenerator {

    public static void main(String[] args) throws IOException {

        if (args.length != 1) {

            throw new Error("Test Bug: Expected region size wasn't provided as command line argument");

        }

        long regionSize = Long.parseLong(args[0]) * 1024 * 1024;

        Path wrkDir = Paths.get("");

        generateClassLoader(regionSize, wrkDir);

    }

    public static void generateClassLoader(long regionSize, Path wrkDir) throws IOException {

        // Generating simple classloader

        String finalSimpleClassLoaderPrototype = TestHumongousClassLoader.GENERIC_PROTOTYPE

                .replace("${Methods}",

                        TestHumongousClassLoader.LOAD_CLASS_METHOD_PROTOTYPE

                                .replace("${ClassLoadFilter}",

                                        "fileName.equals(\"" + TestHumongousClassLoader.HUMONGOUS_CLASSLOADER_NAME

                                                + "\")"))

                .replace("${ClassHeader}", TestHumongousClassLoader.CLASS_HEADER)

                .replace("${ConstructorClause}", TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE);

        Helpers.generateByTemplateAndCompile(TestHumongousClassLoader.SIMPLE_CLASSLOADER_NAME, "ClassLoader",

                finalSimpleClassLoaderPrototype, TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE, regionSize / 4,

                wrkDir, TestHumongousClassLoader.SIMPLE_CLASSLOADER_NAME + "Base");

        // Preparations for generating humongous classloader

        // Generating condition for loadClass method of generated class loader

        // We want the generated class loader to load only classes from G1SampleClass enum

        // All other classes should be loaded by parent classloader

        // As result we get full loadClass method

        StringBuilder classesToLoadBuilder = new StringBuilder();

        for (G1SampleClass g1SampleClass : G1SampleClass.values()) {

            if (classesToLoadBuilder.length() != 0) {

                classesToLoadBuilder.append(" || ");

            }

            classesToLoadBuilder.append("fileName.startsWith(\"" + Helpers.enumNameToClassName(g1SampleClass.name())

                    + "\")");

        }

        // Generating final class loader prototype - with specified methods,header and constructor

        String finalHumongousClassLoaderPrototype = TestHumongousClassLoader.GENERIC_PROTOTYPE

                .replace("${Methods}",

                        TestHumongousClassLoader.LOAD_CLASS_METHOD_PROTOTYPE

                                .replace("${ClassLoadFilter}", classesToLoadBuilder))

                .replace("${ClassHeader}", TestHumongousClassLoader.CLASS_HEADER)

                .replace("${ConstructorClause}", TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE);

        // Generating humongous classloader with specified name, base class, final class prototype and

        // constructor prototype for filler classes

        // Generated class instance should be humongous since we specify size of (regionSize * 3 / 4)

        Helpers.generateByTemplateAndCompile(TestHumongousClassLoader.HUMONGOUS_CLASSLOADER_NAME, "ClassLoader",

                finalHumongousClassLoaderPrototype, TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE,

                regionSize * 3 / 4,

                wrkDir, TestHumongousClassLoader.HUMONGOUS_CLASSLOADER_NAME + "Base");

    }

}