--- a/hotspot/test/gc/g1/humongousObjects/Helpers.java Tue Dec 15 10:43:12 2015 -0500
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,58 +0,0 @@
-/*
- * Copyright (c) 2015, 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 gc.g1.humongousObjects;
-
-import sun.hotspot.WhiteBox;
-
-public class Helpers {
-
- // In case of 128 byte padding
- private static final int MAX_PADDING_SIZE = 128;
-
- /**
- * Detects amount of extra bytes required to allocate a byte array.
- * Allocating a byte[n] array takes more then just n bytes in the heap.
- * Extra bytes are required to store object reference and the length.
- * This amount depends on bitness and other factors.
- *
- * @return byte[] memory overhead
- */
- public static int detectByteArrayAllocationOverhead() {
-
- WhiteBox whiteBox = WhiteBox.getWhiteBox();
-
- int zeroLengthByteArraySize = (int) whiteBox.getObjectSize(new byte[0]);
-
- // Since we do not know is there any padding in zeroLengthByteArraySize we cannot just take byte[0] size as overhead
- for (int i = 1; i < MAX_PADDING_SIZE + 1; ++i) {
- int realAllocationSize = (int) whiteBox.getObjectSize(new byte[i]);
- if (realAllocationSize != zeroLengthByteArraySize) {
- // It means we did not have any padding on previous step
- return zeroLengthByteArraySize - (i - 1);
- }
- }
- throw new Error("We cannot find byte[] memory overhead - should not reach here");
- }
-}
--- a/hotspot/test/gc/g1/humongousObjects/TestHumongousThreshold.java Tue Dec 15 10:43:12 2015 -0500
+++ b/hotspot/test/gc/g1/humongousObjects/TestHumongousThreshold.java Tue Dec 15 16:01:53 2015 +0000
@@ -24,6 +24,7 @@
package gc.g1.humongousObjects;
+import gc.testlibrary.Helpers;
import jdk.test.lib.Asserts;
import sun.hotspot.WhiteBox;
@@ -31,10 +32,10 @@
* @test TestHumongousThreshold
* @summary Checks that objects larger than half a region are allocated as humongous
* @requires vm.gc=="G1" | vm.gc=="null"
- * @library /testlibrary /test/lib
+ * @library /testlibrary /test/lib /
* @modules java.management
* @build sun.hotspot.WhiteBox
- * gc.g1.humongousObjects.Helpers
+ * gc.testlibrary.Helpers
* gc.g1.humongousObjects.TestHumongousThreshold
* @run driver ClassFileInstaller sun.hotspot.WhiteBox
* sun.hotspot.WhiteBox$WhiteBoxPermission
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/testlibrary/Helpers.java Tue Dec 15 16:01:53 2015 +0000
@@ -0,0 +1,251 @@
+/*
+ * Copyright (c) 2015, 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 gc.testlibrary;
+
+import jdk.test.lib.JDKToolLauncher;
+import jdk.test.lib.OutputAnalyzer;
+import sun.hotspot.WhiteBox;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public class Helpers {
+
+ /**
+ * Size of a long field in bytes
+ */
+ public static final int SIZE_OF_LONG = 8;
+
+ // In case of 128 byte padding
+ private static final int MAX_PADDING_SIZE = 128;
+
+ /**
+ * According class file format theoretical amount of fields in class is u2 which is (256 * 256 - 1).
+ * Some service info takes place in constant pool and we really could make a class with only (256 * 256 - 29)
+ * fields.
+ * Since the exact value is not so important and I would like to avoid issues that may be caused by future changes/
+ * different archs etc I selected (256 * 256 - 32) for this constant.
+ * The test works with other values too but the smaller the number the more classes we need to generate and it takes
+ * more time
+ */
+ private static final int MAXIMUM_AMOUNT_OF_FIELDS_IN_CLASS = 256 * 256 - 32;
+
+ /**
+ * Detects amount of extra bytes required to allocate a byte array.
+ * Allocating a byte[n] array takes more then just n bytes in the heap.
+ * Extra bytes are required to store object reference and the length.
+ * This amount depends on bitness and other factors.
+ *
+ * @return byte[] memory overhead
+ */
+ public static int detectByteArrayAllocationOverhead() {
+
+ WhiteBox whiteBox = WhiteBox.getWhiteBox();
+
+ int zeroLengthByteArraySize = (int) whiteBox.getObjectSize(new byte[0]);
+
+ // Since we do not know is there any padding in zeroLengthByteArraySize we cannot just take byte[0] size as overhead
+ for (int i = 1; i < MAX_PADDING_SIZE + 1; ++i) {
+ int realAllocationSize = (int) whiteBox.getObjectSize(new byte[i]);
+ if (realAllocationSize != zeroLengthByteArraySize) {
+ // It means we did not have any padding on previous step
+ return zeroLengthByteArraySize - (i - 1);
+ }
+ }
+ throw new Error("We cannot find byte[] memory overhead - should not reach here");
+ }
+
+ /**
+ * Compiles a java class
+ *
+ * @param className class name
+ * @param root root directory - where .java and .class files will be put
+ * @param source class source
+ * @throws IOException if cannot write file to specified directory
+ */
+ public static void compileClass(String className, Path root, String source) throws IOException {
+ Path sourceFile = root.resolve(className + ".java");
+ Files.write(sourceFile, source.getBytes());
+
+ JDKToolLauncher jar = JDKToolLauncher.create("javac")
+ .addToolArg("-d")
+ .addToolArg(root.toAbsolutePath().toString())
+ .addToolArg("-cp")
+ .addToolArg(System.getProperty("java.class.path") + File.pathSeparator + root.toAbsolutePath())
+ .addToolArg(sourceFile.toAbsolutePath().toString());
+
+ ProcessBuilder pb = new ProcessBuilder(jar.getCommand());
+ OutputAnalyzer output = new OutputAnalyzer(pb.start());
+ output.shouldHaveExitValue(0);
+ }
+
+ /**
+ * Generates class with specified name, which extends specified class, with specified constructor and specified
+ * count of long fields
+ * Generated class will looks like this:
+ * public class ClassName extends SuperClass {
+ * ClassName() {super();}
+ * long f0;
+ * ...
+ * long fNNN;
+ * <p>
+ * }
+ *
+ * @param className class name
+ * @param superClass super class. if null - no extends clause
+ * @param constructor constructor. if null - no constructor
+ * @param fieldCount count of long fields
+ * @return class text
+ */
+ public static String generate(String className, String superClass, String constructor, long fieldCount) {
+
+ StringBuilder builder = new StringBuilder();
+ builder.append(String.format("public class %s%s {\n", className, superClass == null ? ""
+ : " extends " + superClass));
+
+ if (constructor != null) {
+ builder.append(constructor);
+ }
+
+ for (int i = 0; i < fieldCount; ++i) {
+ builder.append(String.format("long f%d;\n", i));
+ }
+
+ builder.append("}\n");
+ return builder.toString();
+ }
+
+ /**
+ * Changes string from enum notation to class notation - i.e. "VERY_SMALL_CAT" to "VerySmallCat"
+ *
+ * @param enumName string in enum notation
+ * @return string in class notation
+ */
+ public static String enumNameToClassName(String enumName) {
+ if (enumName == null) {
+ return null;
+ }
+
+ StringBuilder builder = new StringBuilder();
+ boolean toLowerCase = false;
+ for (int i = 0; i < enumName.length(); ++i) {
+ if (enumName.charAt(i) == '_') {
+ toLowerCase = false;
+ } else {
+ builder.append(toLowerCase ? String.valueOf(enumName.charAt(i)).toLowerCase() :
+ String.valueOf(enumName.charAt(i)));
+ toLowerCase = true;
+ }
+
+ }
+ return builder.toString();
+ }
+
+ /**
+ * Generates and compiles class with instance of specified size and load it in specified class loader
+ * Generated class will looks like this:
+ * public class ClassName extends SuperClass {
+ * long f0;
+ * ...
+ * long fNNN;
+ * <p>
+ * }
+ *
+ * @param classLoader class loader
+ * @param className generated class name
+ * @param instanceSize size of generated class' instance. Size should be aligned by 8 bytes
+ * @param workDir working dir where generated classes are put and compiled
+ * @param prefix prefix for service classes (ones we use to create chain of inheritance).
+ * The names will be prefix_1, prefix_2,.., prefix_n
+ * @return Class object of generated and compiled class loaded in specified class loader
+ * @throws IOException
+ * @throws ClassNotFoundException
+ */
+ public static Class<?> generateCompileAndLoad(ClassLoader classLoader, String className, long instanceSize,
+ Path workDir, String prefix)
+ throws IOException, ClassNotFoundException {
+
+ if (instanceSize % SIZE_OF_LONG != 0L) {
+ throw new Error(String.format("Test bug: only sizes aligned by 8 bytes are supported and %d was specified",
+ instanceSize));
+ }
+
+ long instanceSizeWithoutObjectHeader = instanceSize - WhiteBox.getWhiteBox().getObjectSize(new Object());
+
+ int generatedClassesCount;
+ int fieldsInLastClassCount;
+
+ int sizeOfLastFile = (int) (instanceSizeWithoutObjectHeader
+ % (MAXIMUM_AMOUNT_OF_FIELDS_IN_CLASS * SIZE_OF_LONG));
+
+ if (sizeOfLastFile != 0) {
+ generatedClassesCount = (int) instanceSizeWithoutObjectHeader
+ / (MAXIMUM_AMOUNT_OF_FIELDS_IN_CLASS * SIZE_OF_LONG) + 1;
+ fieldsInLastClassCount = sizeOfLastFile / SIZE_OF_LONG;
+ } else {
+ generatedClassesCount = (int) instanceSizeWithoutObjectHeader
+ / (MAXIMUM_AMOUNT_OF_FIELDS_IN_CLASS * SIZE_OF_LONG);
+ fieldsInLastClassCount = MAXIMUM_AMOUNT_OF_FIELDS_IN_CLASS;
+ }
+
+ for (int i = 0; i < generatedClassesCount; i++) {
+ // for the last generated class we use specified class name
+ String clsName = (i == generatedClassesCount - 1) ? className : prefix + i;
+
+ Helpers.compileClass(clsName, workDir,
+ Helpers.generate(
+ clsName,
+ // for first generated class we don't have 'extends'
+ (i == 0 ? null : prefix + (i - 1)),
+ null,
+ // for the last generated class we use different field count
+ (i == generatedClassesCount - 1) ? fieldsInLastClassCount
+ : MAXIMUM_AMOUNT_OF_FIELDS_IN_CLASS));
+ }
+ return classLoader.loadClass(className);
+ }
+
+ /**
+ * Waits until Concurent Mark Cycle finishes
+ * @param wb Whitebox instance
+ * @param sleepTime sleep time
+ */
+ public static void waitTillCMCFinished(WhiteBox wb, int sleepTime) {
+ while (wb.g1InConcurrentMark()) {
+ if (sleepTime > -1) {
+ try {
+ Thread.sleep(sleepTime);
+ } catch (InterruptedException e) {
+ System.out.println("Got InterruptedException while waiting for ConcMarkCycle to finish");
+ Thread.currentThread().interrupt();
+ break;
+ }
+ }
+ }
+ }
+
+}