252 lines
9.8 KiB
Java
252 lines
9.8 KiB
Java
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/*
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* Copyright (c) 2015, 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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*/
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package gc.testlibrary;
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import jdk.test.lib.JDKToolLauncher;
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import jdk.test.lib.OutputAnalyzer;
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import sun.hotspot.WhiteBox;
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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public class Helpers {
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/**
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* Size of a long field in bytes
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*/
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public static final int SIZE_OF_LONG = 8;
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// In case of 128 byte padding
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private static final int MAX_PADDING_SIZE = 128;
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/**
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* According class file format theoretical amount of fields in class is u2 which is (256 * 256 - 1).
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* Some service info takes place in constant pool and we really could make a class with only (256 * 256 - 29)
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* fields.
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* Since the exact value is not so important and I would like to avoid issues that may be caused by future changes/
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* different archs etc I selected (256 * 256 - 32) for this constant.
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* The test works with other values too but the smaller the number the more classes we need to generate and it takes
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* more time
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*/
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private static final int MAXIMUM_AMOUNT_OF_FIELDS_IN_CLASS = 256 * 256 - 32;
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/**
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* Detects amount of extra bytes required to allocate a byte array.
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* Allocating a byte[n] array takes more then just n bytes in the heap.
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* Extra bytes are required to store object reference and the length.
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* This amount depends on bitness and other factors.
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*
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* @return byte[] memory overhead
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*/
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public static int detectByteArrayAllocationOverhead() {
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WhiteBox whiteBox = WhiteBox.getWhiteBox();
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int zeroLengthByteArraySize = (int) whiteBox.getObjectSize(new byte[0]);
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// Since we do not know is there any padding in zeroLengthByteArraySize we cannot just take byte[0] size as overhead
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for (int i = 1; i < MAX_PADDING_SIZE + 1; ++i) {
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int realAllocationSize = (int) whiteBox.getObjectSize(new byte[i]);
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if (realAllocationSize != zeroLengthByteArraySize) {
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// It means we did not have any padding on previous step
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return zeroLengthByteArraySize - (i - 1);
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}
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}
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throw new Error("We cannot find byte[] memory overhead - should not reach here");
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}
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/**
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* Compiles a java class
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*
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* @param className class name
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* @param root root directory - where .java and .class files will be put
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* @param source class source
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* @throws IOException if cannot write file to specified directory
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*/
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public static void compileClass(String className, Path root, String source) throws IOException {
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Path sourceFile = root.resolve(className + ".java");
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Files.write(sourceFile, source.getBytes());
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JDKToolLauncher jar = JDKToolLauncher.create("javac")
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.addToolArg("-d")
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.addToolArg(root.toAbsolutePath().toString())
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.addToolArg("-cp")
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.addToolArg(System.getProperty("java.class.path") + File.pathSeparator + root.toAbsolutePath())
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.addToolArg(sourceFile.toAbsolutePath().toString());
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ProcessBuilder pb = new ProcessBuilder(jar.getCommand());
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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output.shouldHaveExitValue(0);
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}
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/**
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* Generates class with specified name, which extends specified class, with specified constructor and specified
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* count of long fields
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* Generated class will looks like this:
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* public class ClassName extends SuperClass {
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* ClassName() {super();}
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* long f0;
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* ...
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* long fNNN;
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* <p>
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* }
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*
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* @param className class name
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* @param superClass super class. if null - no extends clause
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* @param constructor constructor. if null - no constructor
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* @param fieldCount count of long fields
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* @return class text
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*/
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public static String generate(String className, String superClass, String constructor, long fieldCount) {
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StringBuilder builder = new StringBuilder();
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builder.append(String.format("public class %s%s {\n", className, superClass == null ? ""
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: " extends " + superClass));
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if (constructor != null) {
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builder.append(constructor);
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}
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for (int i = 0; i < fieldCount; ++i) {
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builder.append(String.format("long f%d;\n", i));
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}
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builder.append("}\n");
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return builder.toString();
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}
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/**
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* Changes string from enum notation to class notation - i.e. "VERY_SMALL_CAT" to "VerySmallCat"
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*
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* @param enumName string in enum notation
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* @return string in class notation
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*/
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public static String enumNameToClassName(String enumName) {
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if (enumName == null) {
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return null;
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}
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StringBuilder builder = new StringBuilder();
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boolean toLowerCase = false;
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for (int i = 0; i < enumName.length(); ++i) {
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if (enumName.charAt(i) == '_') {
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toLowerCase = false;
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} else {
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builder.append(toLowerCase ? String.valueOf(enumName.charAt(i)).toLowerCase() :
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String.valueOf(enumName.charAt(i)));
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toLowerCase = true;
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}
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}
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return builder.toString();
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}
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/**
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* Generates and compiles class with instance of specified size and load it in specified class loader
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* Generated class will looks like this:
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* public class ClassName extends SuperClass {
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* long f0;
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* ...
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* long fNNN;
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* <p>
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* }
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*
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* @param classLoader class loader
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* @param className generated class name
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* @param instanceSize size of generated class' instance. Size should be aligned by 8 bytes
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* @param workDir working dir where generated classes are put and compiled
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* @param prefix prefix for service classes (ones we use to create chain of inheritance).
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* The names will be prefix_1, prefix_2,.., prefix_n
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* @return Class object of generated and compiled class loaded in specified class loader
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* @throws IOException
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* @throws ClassNotFoundException
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*/
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public static Class<?> generateCompileAndLoad(ClassLoader classLoader, String className, long instanceSize,
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Path workDir, String prefix)
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throws IOException, ClassNotFoundException {
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if (instanceSize % SIZE_OF_LONG != 0L) {
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throw new Error(String.format("Test bug: only sizes aligned by 8 bytes are supported and %d was specified",
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instanceSize));
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}
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long instanceSizeWithoutObjectHeader = instanceSize - WhiteBox.getWhiteBox().getObjectSize(new Object());
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int generatedClassesCount;
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int fieldsInLastClassCount;
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int sizeOfLastFile = (int) (instanceSizeWithoutObjectHeader
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% (MAXIMUM_AMOUNT_OF_FIELDS_IN_CLASS * SIZE_OF_LONG));
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if (sizeOfLastFile != 0) {
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generatedClassesCount = (int) instanceSizeWithoutObjectHeader
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/ (MAXIMUM_AMOUNT_OF_FIELDS_IN_CLASS * SIZE_OF_LONG) + 1;
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fieldsInLastClassCount = sizeOfLastFile / SIZE_OF_LONG;
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} else {
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generatedClassesCount = (int) instanceSizeWithoutObjectHeader
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/ (MAXIMUM_AMOUNT_OF_FIELDS_IN_CLASS * SIZE_OF_LONG);
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fieldsInLastClassCount = MAXIMUM_AMOUNT_OF_FIELDS_IN_CLASS;
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}
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for (int i = 0; i < generatedClassesCount; i++) {
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// for the last generated class we use specified class name
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String clsName = (i == generatedClassesCount - 1) ? className : prefix + i;
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Helpers.compileClass(clsName, workDir,
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Helpers.generate(
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clsName,
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// for first generated class we don't have 'extends'
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(i == 0 ? null : prefix + (i - 1)),
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null,
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// for the last generated class we use different field count
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(i == generatedClassesCount - 1) ? fieldsInLastClassCount
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: MAXIMUM_AMOUNT_OF_FIELDS_IN_CLASS));
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}
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return classLoader.loadClass(className);
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}
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/**
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* Waits until Concurent Mark Cycle finishes
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* @param wb Whitebox instance
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* @param sleepTime sleep time
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*/
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public static void waitTillCMCFinished(WhiteBox wb, int sleepTime) {
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while (wb.g1InConcurrentMark()) {
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if (sleepTime > -1) {
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try {
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Thread.sleep(sleepTime);
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} catch (InterruptedException e) {
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System.out.println("Got InterruptedException while waiting for ConcMarkCycle to finish");
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Thread.currentThread().interrupt();
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break;
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}
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}
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}
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}
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}
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