rev 55117 : 8223350: [lworld] Use inline classes instead of value classes

   1 /*
   2  * Copyright (c) 2018, 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 /*
  26  * @test
  27  * @summary test value bootstrap methods
  28  * @modules java.base/jdk.internal.org.objectweb.asm
  29  * @compile -XDallowWithFieldOperator ValueBootstrapMethods.java
  30  * @run main/othervm -XX:+EnableValhalla -Dvalue.bsm.salt=1 ValueBootstrapMethods
  31  */
  32 
  33 import java.io.IOException;
  34 import java.lang.invoke.CallSite;
  35 import java.lang.invoke.MethodHandles;
  36 import java.lang.invoke.MethodType;
  37 import java.lang.reflect.*;
  38 import java.nio.file.Files;
  39 import java.nio.file.Path;
  40 import java.nio.file.Paths;
  41 import java.util.HashSet;
  42 import java.util.List;
  43 import java.util.Objects;
  44 import java.util.Set;
  45 
  46 import jdk.internal.org.objectweb.asm.Attribute;
  47 import jdk.internal.org.objectweb.asm.ByteVector;
  48 import jdk.internal.org.objectweb.asm.ClassReader;
  49 import jdk.internal.org.objectweb.asm.ClassWriter;
  50 import jdk.internal.org.objectweb.asm.Handle;
  51 import jdk.internal.org.objectweb.asm.Label;
  52 import jdk.internal.org.objectweb.asm.MethodVisitor;
  53 import jdk.internal.org.objectweb.asm.Type;
  54 import static jdk.internal.org.objectweb.asm.Opcodes.*;
  55 
  56 public class ValueBootstrapMethods {
  57     private static final String TEST_CLASSES = System.getProperty("test.classes", ".");
  58 
  59     public static void main(String... args) throws Throwable {
  60         Class<?> test = valueTestClass();
  61         Value value = Value.make(10, 5.03, "foo", "bar", "goo");
  62 
  63         Class<?> valueClass = Value.class.asValueType();
  64         Method hashCode = test.getMethod("hashCode", valueClass);
  65         int hash = (int)hashCode.invoke(null, value);
  66         assertEquals(hash, value.hashCode());
  67 
  68         Method toString = test.getMethod("toString", valueClass);
  69         String s = (String)toString.invoke(null, value);
  70         assertEquals(s, value.toString());
  71 
  72         Method equals = test.getMethod("equals", valueClass, Object.class);
  73         boolean rc = (boolean)equals.invoke(null, value, value);
  74         if (!rc) {
  75             throw new RuntimeException("expected equals");
  76         }
  77     }
  78 
  79     public static final value class Value {
  80         private final int i;
  81         private final double d;
  82         private final String s;
  83         private final List<String> l;
  84         Value() {
  85             this.i = 0;
  86             this.d = 0;
  87             this.s = "default";
  88             this.l = List.of();
  89         }
  90         public static Value make(int i, double d, String s, String... items) {
  91             Value v = Value.default;
  92             v = __WithField(v.i, i);
  93             v = __WithField(v.d, d);
  94             v = __WithField(v.s, s);
  95             v = __WithField(v.l, List.of(items));
  96             return v;
  97         }
  98 
  99         List<Object> values() {
 100             return List.of(Value.class.asValueType(), i, d, s, l);
 101         }
 102 
 103         public int hashCode() {
 104             return values().hashCode();
 105         }
 106 
 107         public String toString() {
 108             System.out.println(l);
 109             return String.format("[%s i=%s d=%s s=%s l=%s]", Value.class.getName(),
 110                                  i, String.valueOf(d), s, l.toString());
 111         }
 112     }
 113 
 114     /*
 115      * Generate ValueTest class
 116      */
 117     private static Class<?> valueTestClass() throws Exception {
 118         Path path = Paths.get(TEST_CLASSES, "ValueTest.class");
 119         generate(Value.class.asValueType(), "ValueTest", path);
 120         return Class.forName("ValueTest");
 121     }
 122 
 123     private static void assertEquals(Object o1, Object expected) {
 124         if (!Objects.equals(o1, expected)) {
 125             throw new RuntimeException(o1 + " expected: " + expected);
 126         }
 127     }
 128 
 129     static final int CLASSFILE_VERSION = 56;
 130     static void generate(Class<?> c, String className, Path path) throws IOException {
 131         ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
 132 
 133         cw.visit(CLASSFILE_VERSION,
 134             ACC_SUPER + ACC_PUBLIC + ACC_FINAL + ACC_SYNTHETIC,
 135             className,
 136             null,
 137             "java/lang/Object",
 138             null
 139         );
 140 
 141 
 142         MethodType mt = MethodType.methodType(CallSite.class,
 143             MethodHandles.Lookup.class, String.class, MethodType.class, Class.class);
 144         Handle bootstrap = new Handle(H_INVOKESTATIC, Type.getInternalName(java.lang.invoke.ValueBootstrapMethods.class),
 145             "makeBootstrapMethod", mt.toMethodDescriptorString(), false);
 146 
 147         Type type = Type.getType(c);
 148         MethodVisitor mv = cw.visitMethod(
 149             ACC_PUBLIC + ACC_STATIC + ACC_FINAL,
 150             "hashCode",
 151             Type.getMethodDescriptor(Type.INT_TYPE, type),
 152             null,
 153             null);
 154 
 155         mv.visitVarInsn(ALOAD, 0);
 156         mv.visitInvokeDynamicInsn("hashCode",
 157             Type.getMethodDescriptor(Type.INT_TYPE, type),
 158             bootstrap, type);
 159         mv.visitInsn(IRETURN);
 160 
 161         mv.visitMaxs(-1, -1);
 162         mv.visitEnd();
 163 
 164         mv = cw.visitMethod(
 165             ACC_PUBLIC + ACC_STATIC + ACC_FINAL,
 166             "equals",
 167             Type.getMethodDescriptor(Type.BOOLEAN_TYPE, type, Type.getType(Object.class)),
 168             null,
 169             null);
 170 
 171         mv.visitVarInsn(ALOAD, 0);
 172         mv.visitVarInsn(ALOAD, 1);
 173         mv.visitInvokeDynamicInsn("equals",
 174             Type.getMethodDescriptor(Type.BOOLEAN_TYPE, type, Type.getType(Object.class)),
 175             bootstrap, type);
 176         mv.visitInsn(IRETURN);
 177         mv.visitMaxs(-1, -1);
 178         mv.visitEnd();
 179 
 180         mv = cw.visitMethod(
 181             ACC_PUBLIC + ACC_STATIC + ACC_FINAL,
 182             "toString",
 183             Type.getMethodDescriptor(Type.getType(String.class), type),
 184             null,
 185             null);
 186 
 187         mv.visitVarInsn(ALOAD, 0);
 188         mv.visitInvokeDynamicInsn("toString",
 189             Type.getMethodDescriptor(Type.getType(String.class), type),
 190             bootstrap,  type);
 191         mv.visitInsn(ARETURN);
 192         mv.visitMaxs(-1, -1);
 193         mv.visitEnd();
 194 
 195         cw.visitEnd();
 196 
 197         byte[] classBytes = cw.toByteArray();
 198         System.out.println("writing " + path);
 199         Files.write(path, classBytes);
 200     }
 201 }
--- EOF ---