# HG changeset patch
# User kzhaldyb
# Date 1451853378 -10800
#      Sun Jan 03 23:36:18 2016 +0300
# Node ID 0bbd855f6af75d96d7b0772bd8d3414ad52a9ef3
# Parent  b3093f9cb24e6019873ead1c920ee104ca12b85c
8132717: Add tests checking that instances of j.l.Classes of a large size are allocated as Humongous
Reviewed-by: duke

diff --git a/test/gc/g1/humongousObjects/G1SampleClass.java b/test/gc/g1/humongousObjects/G1SampleClass.java
new file mode 100644
--- /dev/null
+++ b/test/gc/g1/humongousObjects/G1SampleClass.java
@@ -0,0 +1,93 @@
+/*
+ * 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 gc.testlibrary.Helpers;
+import sun.hotspot.WhiteBox;
+
+import java.io.IOException;
+import java.nio.file.Path;
+
+/**
+ * Provides generated and compiled sample classes and theirs expected sizes.
+ */
+public enum G1SampleClass {
+
+    LARGEST_NON_HUMONGOUS {
+        @Override
+        public long expectedInstanceSize() {
+            return HALF_G1_REGION_SIZE;
+        }
+    },
+    SMALLEST_HUMONGOUS {
+        @Override
+        public long expectedInstanceSize() {
+            return HALF_G1_REGION_SIZE + Helpers.SIZE_OF_LONG;
+        }
+    },
+    ONE_REGION_HUMONGOUS {
+        @Override
+        public long expectedInstanceSize() {
+            return G1_REGION_SIZE;
+        }
+    },
+    TWO_REGION_HUMONGOUS {
+        @Override
+        public long expectedInstanceSize() {
+            return G1_REGION_SIZE + Helpers.SIZE_OF_LONG;
+        }
+    },
+    MORE_THAN_TWO_REGION_HUMONGOUS {
+        @Override
+        public long expectedInstanceSize() {
+            return G1_REGION_SIZE * 2 + Helpers.SIZE_OF_LONG;
+        }
+    };
+
+    private static final long G1_REGION_SIZE = WhiteBox.getWhiteBox().g1RegionSize();
+    private static final long HALF_G1_REGION_SIZE = G1_REGION_SIZE / 2;
+
+    /**
+     * Generates and compiles class with instance of specified size and loads it in specified class loader
+     *
+     * @param classLoader class loader which will be used to load class
+     * @param wrkDir working dir where generated classes are put and compiled
+     * @param classNamePrefix prefix for service classes (ones we use to create chain of inheritance)
+     * @return a class of specified size loaded in specified class loader
+     * @throws IOException
+     * @throws ClassNotFoundException
+     */
+
+    public Class<?> getCls(ClassLoader classLoader, Path wrkDir, String classNamePrefix)
+            throws IOException, ClassNotFoundException {
+        return Helpers.generateCompileAndLoad(classLoader, Helpers.enumNameToClassName(name()) + "Class",
+                expectedInstanceSize(), wrkDir, classNamePrefix);
+    }
+
+    /**
+     * @return G1SampleClass instance expected size
+     */
+    public abstract long expectedInstanceSize();
+}
diff --git a/test/gc/g1/humongousObjects/TestHumongousNonArrayAllocation.java b/test/gc/g1/humongousObjects/TestHumongousNonArrayAllocation.java
new file mode 100644
--- /dev/null
+++ b/test/gc/g1/humongousObjects/TestHumongousNonArrayAllocation.java
@@ -0,0 +1,122 @@
+/*
+ * 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 jdk.test.lib.Asserts;
+import sun.hotspot.WhiteBox;
+
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+/**
+ * @test gc.g1.humongousObjects.TestHumongousNonArrayAllocation
+ * @summary Checks that huge class' instances (ie with huge amount of fields) are allocated successfully
+ * @requires vm.gc=="G1" | vm.gc=="null"
+ * @requires vm.opt.G1HeapRegionSize == "null" | vm.opt.G1HeapRegionSize == "1M"
+ * @library /testlibrary /test/lib /
+ * @modules java.management
+ * @build sun.hotspot.WhiteBox
+ *        gc.testlibrary.Helpers
+ *        gc.g1.humongousObjects.G1SampleClass
+ *        gc.g1.humongousObjects.TestHumongousNonArrayAllocation
+ *
+ * @run driver ClassFileInstaller sun.hotspot.WhiteBox
+ *                                sun.hotspot.WhiteBox$WhiteBoxPermission
+ *
+ * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ *                   -XX:G1HeapRegionSize=1M
+ *                   gc.g1.humongousObjects.TestHumongousNonArrayAllocation LARGEST_NON_HUMONGOUS
+ *
+ * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ *                   -XX:G1HeapRegionSize=1M
+ *                   gc.g1.humongousObjects.TestHumongousNonArrayAllocation SMALLEST_HUMONGOUS
+ *
+ * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ *                   -XX:G1HeapRegionSize=1M
+ *                   gc.g1.humongousObjects.TestHumongousNonArrayAllocation ONE_REGION_HUMONGOUS
+ *
+ * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ *                   -XX:G1HeapRegionSize=1M
+ *                   gc.g1.humongousObjects.TestHumongousNonArrayAllocation TWO_REGION_HUMONGOUS
+ *
+ * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ *                   -XX:G1HeapRegionSize=1M
+ *                   gc.g1.humongousObjects.TestHumongousNonArrayAllocation MORE_THAN_TWO_REGION_HUMONGOUS
+ *
+ */
+
+/**
+ * The test for objects which are instances of classes with a huge amount of fields. It's an alternative way to create
+ * a humongous object rather to allocate a long array.
+ * The size of a class object depends on the field declared in the class. So, the tests generates such classes to cover
+ * the following cases:
+ * largest non-humongous object (exactly half a region)
+ * smallest humongous object (half a region + sizeof(long))
+ * humongous object that takes exactly one region
+ * the smallest humongous object that takes more than one region (region + sizeof(long)).
+ *
+ */
+public class TestHumongousNonArrayAllocation {
+    private static final WhiteBox WB = WhiteBox.getWhiteBox();
+    private static final String CLASS_NAME_PREFIX = TestHumongousNonArrayAllocation.class.getSimpleName() + "_";
+
+    public static void main(String[] args) throws ClassNotFoundException, InstantiationException,
+            IllegalAccessException, IOException {
+
+        if (args.length != 1) {
+            throw new Error("Test Bug: Expected class name wasn't provided as command line argument");
+        }
+        G1SampleClass sampleClass = G1SampleClass.valueOf(args[0]);
+
+        Path wrkDir = Files.createTempDirectory(Paths.get(""), CLASS_NAME_PREFIX);
+        URL[] url = {wrkDir.toUri().toURL()};
+        URLClassLoader urlLoader = new URLClassLoader(url);
+
+        Object sampleObject;
+        try {
+            sampleObject = sampleClass.getCls(urlLoader, wrkDir, CLASS_NAME_PREFIX).newInstance();
+        } catch (Throwable throwable) {
+            throw new AssertionError("Test Bug: Cannot create object of provided class", throwable);
+        }
+
+        boolean isHumongous = WB.g1IsHumongous(sampleObject);
+        boolean shouldBeHumongous = (sampleClass.expectedInstanceSize() > (WB.g1RegionSize() / 2));
+
+        // Sanity check
+        Asserts.assertEquals(WB.getObjectSize(sampleObject), sampleClass.expectedInstanceSize(),
+                String.format("Test Bug: Object of class %s is expected to take %d bytes but it takes %d.",
+                        sampleClass.name(), sampleClass.expectedInstanceSize(), WB.getObjectSize(sampleObject)));
+
+        // Test check
+        Asserts.assertEquals(isHumongous, shouldBeHumongous,
+                String.format("Object of class %s is expected to be %shumongous but it is not",
+                        sampleClass.name(), (shouldBeHumongous ? "" : "non-")));
+    }
+
+}