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  */
  43 
  44 public class ValueTypeDensity {
  45 
  46     private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
  47 
  48     public ValueTypeDensity() {
  49         if (WHITE_BOX.getIntxVMFlag("ValueArrayElemMaxFlatSize") != -1) {
  50             throw new IllegalStateException("ValueArrayElemMaxFlatSize should be -1");
  51         }
  52     }
  53 
  54     interface LocalDate {
  55         public int getYear();
  56         public short getMonth();
  57         public short getDay();
  58     }
  59 
  60     interface LocalTime {
  61         public byte getHour();
  62         public byte getMinute();
  63         public byte getSecond();
  64         public int getNano();
  65     }
  66 
  67     interface LocalDateTime extends LocalDate, LocalTime {}
  68 
  69     static final inline class LocalDateValue implements LocalDate {
  70         final int   year;
  71         final short month;
  72         final short day;
  73 
  74         LocalDateValue() {
  75             year  = 0;
  76             month = 0;
  77             day   = 0;
  78         }
  79 
  80         public int   getYear()  { return year; }
  81         public short getMonth() { return month; }
  82         public short getDay()   { return day; }
  83 
  84         public static LocalDateValue create(int year, short month, short day) {
  85             LocalDateValue localDate = LocalDateValue.default;
  86             localDate = __WithField(localDate.year, year);
  87             localDate = __WithField(localDate.month, month);
  88             localDate = __WithField(localDate.day, day);
  89             return localDate;
  90         }
  91     }
  92 
  93     static final inline class LocalTimeValue implements LocalTime {
  94         final byte hour;
  95         final byte minute;
  96         final byte second;
  97         final int nano;
  98 
  99         LocalTimeValue() {
 100             hour   = 0;
 101             minute = 0;
 102             second = 0;
 103             nano   = 0;
 104         }
 105 
 106         public byte getHour()   { return hour; }
 107         public byte getMinute() { return minute; }
 108         public byte getSecond() { return second; }
 109         public int getNano()    { return nano; }
 110 
 111         public static LocalTimeValue create(byte hour, byte minute, byte second, int nano) {
 112             LocalTimeValue localTime = LocalTimeValue.default;
 113             localTime = __WithField(localTime.hour, hour);
 114             localTime = __WithField(localTime.minute, minute);
 115             localTime = __WithField(localTime.second, second);
 116             localTime = __WithField(localTime.nano, nano);
 117             return localTime;
 118         }
 119     }
 120 
 121     static final inline class LocalDateTimeValue implements LocalDateTime {
 122         final LocalDateValue date;
 123         final LocalTimeValue time;
 124 
 125         LocalDateTimeValue() {
 126             // Well this is a little weird...
 127             date = LocalDateValue.create(0, (short)0, (short)0);
 128             time = LocalTimeValue.create((byte)0, (byte)0, (byte)0, 0);
 129         }
 130 
 131         public int   getYear()  { return date.year; }
 132         public short getMonth() { return date.month; }
 133         public short getDay()   { return date.day; }
 134 
 135         public byte getHour()   { return time.hour; }
 136         public byte getMinute() { return time.minute; }
 137         public byte getSecond() { return time.second; }
 138         public int getNano()    { return time.nano; }
 139 
 140         public static LocalDateTimeValue create(LocalDateValue date, LocalTimeValue time) {
 141             LocalDateTimeValue localDateTime = LocalDateTimeValue.default;
 142             localDateTime = __WithField(localDateTime.date, date);
 143             localDateTime = __WithField(localDateTime.time, time);
 144             return localDateTime;
 145         }
 146     }
 147 
 148     static final class LocalDateClass implements LocalDate {
 149         final int   year;
 150         final short month;
 151         final short day;
 152 
 153         LocalDateClass(int year, short month, short day) {
 154             this.year  = year;
 155             this.month = month;
 156             this.day   = day;
 157         }
 158 
 159         public int   getYear()  { return year; }
 160         public short getMonth() { return month; }
 161         public short getDay()   { return day; }
 162     }
 163 
 164     static final class LocalTimeClass implements LocalTime {
 165         final byte hour;
 166         final byte minute;
 167         final byte second;
 168         final int nano;
 169 
 170         LocalTimeClass(byte hour, byte minute, byte second, int nano) {
 171             this.hour   = hour;
 172             this.minute = minute;
 173             this.second = second;
 174             this.nano   = nano;
 175         }
 176 
 177         public byte getHour()   { return hour; }
 178         public byte getMinute() { return minute; }
 179         public byte getSecond() { return second; }
 180         public int getNano()    { return nano; }
 181     }
 182 
 183     static final class LocalDateTimeClass implements LocalDateTime {
 184         final LocalDateClass date;
 185         final LocalTimeClass time;
 186 
 187         LocalDateTimeClass(LocalDateClass date, LocalTimeClass time) {
 188             this.date = date;
 189             this.time = time;
 190         }
 191 
 192         public LocalDateClass getDate() { return date; }
 193         public LocalTimeClass getTime() { return time; }
 194 
 195         public int   getYear()  { return date.year; }
 196         public short getMonth() { return date.month; }
 197         public short getDay()   { return date.day; }
 198 
 199         public byte getHour()   { return time.hour; }
 200         public byte getMinute() { return time.minute; }
 201         public byte getSecond() { return time.second; }
 202         public int getNano()    { return time.nano; }
 203     }
 204 
 205     public void ensureArraySizeWin() {
 206         int arrayLength = 1000;
 207         System.out.println("ensureArraySizeWin for length " + arrayLength);
 208         LocalDateTimeClass[] objectArray = new LocalDateTimeClass[arrayLength];
 209         for (int i = 0; i < arrayLength; i++) {
 210             objectArray[i] = new LocalDateTimeClass(new LocalDateClass(0, (short)0, (short)0),
 211                     new LocalTimeClass((byte)0, (byte)0, (byte)0, 0));
 212         }
 213 
 214         long objectArraySize = WHITE_BOX.getObjectSize(objectArray);
 215         System.out.println("Empty object array size: " + objectArraySize);
 216         objectArraySize += (arrayLength *
 217                 (WHITE_BOX.getObjectSize(objectArray[0]) +
 218                         WHITE_BOX.getObjectSize(objectArray[0].getDate()) +
 219                         WHITE_BOX.getObjectSize(objectArray[0].getTime())));
 220 
 221         LocalDateTimeValue[] valueArray = new LocalDateTimeValue[arrayLength];
 222         // CMH: add "isFlatValueArray" to WhiteBox API, to ensure we are correctly account size
 223 
 224         long valueArraySize = WHITE_BOX.getObjectSize(valueArray);
 225         System.out.println("Object array and elements: " + objectArraySize + " versus Value Array: " + valueArraySize);
 226         Asserts.assertLessThan(valueArraySize, objectArraySize, "Value array accounts for more heap than object array + elements !");
 227     }
 228 
 229     public void test() {
 230         ensureArraySizeWin();
 231     }
 232 
 233     public static void main(String[] args) {
 234         new ValueTypeDensity().test();
 235     }
 236 
 237 }
 238