1 /*
   2  * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 import java.lang.management.MemoryPoolMXBean;
  26 
  27 import sun.hotspot.WhiteBox;
  28 import jdk.test.lib.Asserts;
  29 
  30 /**
  31  * @test ValueTypeDensity
  32  * @summary Heap density test for ValueTypes
  33  * @library /test/lib
  34  * @compile -XDemitQtypes -XDenableValueTypes -XDallowWithFieldOperator ValueTypeDensity.java
  35  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  36  * @run main/othervm -Xint -XX:ValueArrayElemMaxFlatSize=-1
  37  *                   -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  38  *                    -XX:+WhiteBoxAPI ValueTypeDensity
  39  * @run main/othervm -Xcomp -XX:ValueArrayElemMaxFlatSize=-1
  40  *                   -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  41  *                   -XX:+WhiteBoxAPI ValueTypeDensity
  42  * @run main/othervm -Xbatch -XX:ForceNonTearable=*
  43  *                   -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  44  *                   -XX:+WhiteBoxAPI ValueTypeDensity
  45  */
  46 
  47 public class ValueTypeDensity {
  48 
  49     private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
  50 
  51     public ValueTypeDensity() {
  52         if (WHITE_BOX.getIntxVMFlag("ValueArrayElemMaxFlatSize") != -1) {
  53             throw new IllegalStateException("ValueArrayElemMaxFlatSize should be -1");
  54         }
  55     }
  56 
  57     interface LocalDate {
  58         public int getYear();
  59         public short getMonth();
  60         public short getDay();
  61     }
  62 
  63     interface LocalTime {
  64         public byte getHour();
  65         public byte getMinute();
  66         public byte getSecond();
  67         public int getNano();
  68     }
  69 
  70     interface LocalDateTime extends LocalDate, LocalTime {}
  71 
  72     static final inline class LocalDateValue implements LocalDate {
  73         final int   year;
  74         final short month;
  75         final short day;
  76 
  77         LocalDateValue() {
  78             year  = 0;
  79             month = 0;
  80             day   = 0;
  81         }
  82 
  83         public int   getYear()  { return year; }
  84         public short getMonth() { return month; }
  85         public short getDay()   { return day; }
  86 
  87         public static LocalDateValue create(int year, short month, short day) {
  88             LocalDateValue localDate = LocalDateValue.default;
  89             localDate = __WithField(localDate.year, year);
  90             localDate = __WithField(localDate.month, month);
  91             localDate = __WithField(localDate.day, day);
  92             return localDate;
  93         }
  94     }
  95 
  96     static final inline class LocalTimeValue implements LocalTime {
  97         final byte hour;
  98         final byte minute;
  99         final byte second;
 100         final int nano;
 101 
 102         LocalTimeValue() {
 103             hour   = 0;
 104             minute = 0;
 105             second = 0;
 106             nano   = 0;
 107         }
 108 
 109         public byte getHour()   { return hour; }
 110         public byte getMinute() { return minute; }
 111         public byte getSecond() { return second; }
 112         public int getNano()    { return nano; }
 113 
 114         public static LocalTimeValue create(byte hour, byte minute, byte second, int nano) {
 115             LocalTimeValue localTime = LocalTimeValue.default;
 116             localTime = __WithField(localTime.hour, hour);
 117             localTime = __WithField(localTime.minute, minute);
 118             localTime = __WithField(localTime.second, second);
 119             localTime = __WithField(localTime.nano, nano);
 120             return localTime;
 121         }
 122     }
 123 
 124     static final inline class LocalDateTimeValue implements LocalDateTime {
 125         final LocalDateValue date;
 126         final LocalTimeValue time;
 127 
 128         LocalDateTimeValue() {
 129             // Well this is a little weird...
 130             date = LocalDateValue.create(0, (short)0, (short)0);
 131             time = LocalTimeValue.create((byte)0, (byte)0, (byte)0, 0);
 132         }
 133 
 134         public int   getYear()  { return date.year; }
 135         public short getMonth() { return date.month; }
 136         public short getDay()   { return date.day; }
 137 
 138         public byte getHour()   { return time.hour; }
 139         public byte getMinute() { return time.minute; }
 140         public byte getSecond() { return time.second; }
 141         public int getNano()    { return time.nano; }
 142 
 143         public static LocalDateTimeValue create(LocalDateValue date, LocalTimeValue time) {
 144             LocalDateTimeValue localDateTime = LocalDateTimeValue.default;
 145             localDateTime = __WithField(localDateTime.date, date);
 146             localDateTime = __WithField(localDateTime.time, time);
 147             return localDateTime;
 148         }
 149     }
 150 
 151     static final class LocalDateClass implements LocalDate {
 152         final int   year;
 153         final short month;
 154         final short day;
 155 
 156         LocalDateClass(int year, short month, short day) {
 157             this.year  = year;
 158             this.month = month;
 159             this.day   = day;
 160         }
 161 
 162         public int   getYear()  { return year; }
 163         public short getMonth() { return month; }
 164         public short getDay()   { return day; }
 165     }
 166 
 167     static final class LocalTimeClass implements LocalTime {
 168         final byte hour;
 169         final byte minute;
 170         final byte second;
 171         final int nano;
 172 
 173         LocalTimeClass(byte hour, byte minute, byte second, int nano) {
 174             this.hour   = hour;
 175             this.minute = minute;
 176             this.second = second;
 177             this.nano   = nano;
 178         }
 179 
 180         public byte getHour()   { return hour; }
 181         public byte getMinute() { return minute; }
 182         public byte getSecond() { return second; }
 183         public int getNano()    { return nano; }
 184     }
 185 
 186     static final class LocalDateTimeClass implements LocalDateTime {
 187         final LocalDateClass date;
 188         final LocalTimeClass time;
 189 
 190         LocalDateTimeClass(LocalDateClass date, LocalTimeClass time) {
 191             this.date = date;
 192             this.time = time;
 193         }
 194 
 195         public LocalDateClass getDate() { return date; }
 196         public LocalTimeClass getTime() { return time; }
 197 
 198         public int   getYear()  { return date.year; }
 199         public short getMonth() { return date.month; }
 200         public short getDay()   { return date.day; }
 201 
 202         public byte getHour()   { return time.hour; }
 203         public byte getMinute() { return time.minute; }
 204         public byte getSecond() { return time.second; }
 205         public int getNano()    { return time.nano; }
 206     }
 207 
 208     public void ensureArraySizeWin() {
 209         int arrayLength = 1000;
 210         System.out.println("ensureArraySizeWin for length " + arrayLength);
 211         LocalDateTimeClass[] objectArray = new LocalDateTimeClass[arrayLength];
 212         for (int i = 0; i < arrayLength; i++) {
 213             objectArray[i] = new LocalDateTimeClass(new LocalDateClass(0, (short)0, (short)0),
 214                     new LocalTimeClass((byte)0, (byte)0, (byte)0, 0));
 215         }
 216 
 217         long objectArraySize = WHITE_BOX.getObjectSize(objectArray);
 218         System.out.println("Empty object array size: " + objectArraySize);
 219         objectArraySize += (arrayLength *
 220                 (WHITE_BOX.getObjectSize(objectArray[0]) +
 221                         WHITE_BOX.getObjectSize(objectArray[0].getDate()) +
 222                         WHITE_BOX.getObjectSize(objectArray[0].getTime())));
 223 
 224         LocalDateTimeValue[] valueArray = new LocalDateTimeValue[arrayLength];
 225         // CMH: add "isFlatValueArray" to WhiteBox API, to ensure we are correctly account size
 226 
 227         long valueArraySize = WHITE_BOX.getObjectSize(valueArray);
 228         System.out.println("Object array and elements: " + objectArraySize + " versus Value Array: " + valueArraySize);
 229         Asserts.assertLessThan(valueArraySize, objectArraySize, "Value array accounts for more heap than object array + elements !");
 230     }
 231 
 232     public void test() {
 233         ensureArraySizeWin();
 234     }
 235 
 236     public static void main(String[] args) {
 237         new ValueTypeDensity().test();
 238     }
 239 
 240 }
 241