Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/oops/Klass.java @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 1d1603768966 |
| children | d8ce2825b193 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.oops; | |
| 26 | |
| 27 import java.io.*; | |
| 28 import java.util.*; | |
| 29 import sun.jvm.hotspot.debugger.*; | |
| 30 import sun.jvm.hotspot.runtime.*; | |
| 31 import sun.jvm.hotspot.types.*; | |
| 32 | |
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33 public class Klass extends Metadata implements ClassConstants { |
| 0 | 34 static { |
| 35 VM.registerVMInitializedObserver(new Observer() { | |
| 36 public void update(Observable o, Object data) { | |
| 37 initialize(VM.getVM().getTypeDataBase()); | |
| 38 } | |
| 39 }); | |
| 40 } | |
| 41 | |
| 42 // anon-enum constants for _layout_helper. | |
| 43 public static int LH_INSTANCE_SLOW_PATH_BIT; | |
| 44 public static int LH_LOG2_ELEMENT_SIZE_SHIFT; | |
| 45 public static int LH_ELEMENT_TYPE_SHIFT; | |
| 46 public static int LH_HEADER_SIZE_SHIFT; | |
| 47 public static int LH_ARRAY_TAG_SHIFT; | |
| 48 public static int LH_ARRAY_TAG_TYPE_VALUE; | |
| 49 public static int LH_ARRAY_TAG_OBJ_VALUE; | |
| 50 | |
| 51 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { | |
| 52 Type type = db.lookupType("Klass"); | |
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53 javaMirror = new OopField(type.getOopField("_java_mirror"), 0); |
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54 superField = new MetadataField(type.getAddressField("_super"), 0); |
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55 layoutHelper = new IntField(type.getJIntField("_layout_helper"), 0); |
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56 name = type.getAddressField("_name"); |
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57 accessFlags = new CIntField(type.getCIntegerField("_access_flags"), 0); |
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58 subklass = new MetadataField(type.getAddressField("_subklass"), 0); |
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59 nextSibling = new MetadataField(type.getAddressField("_next_sibling"), 0); |
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60 allocCount = new CIntField(type.getCIntegerField("_alloc_count"), 0); |
| 0 | 61 |
| 62 LH_INSTANCE_SLOW_PATH_BIT = db.lookupIntConstant("Klass::_lh_instance_slow_path_bit").intValue(); | |
| 63 LH_LOG2_ELEMENT_SIZE_SHIFT = db.lookupIntConstant("Klass::_lh_log2_element_size_shift").intValue(); | |
| 64 LH_ELEMENT_TYPE_SHIFT = db.lookupIntConstant("Klass::_lh_element_type_shift").intValue(); | |
| 65 LH_HEADER_SIZE_SHIFT = db.lookupIntConstant("Klass::_lh_header_size_shift").intValue(); | |
| 66 LH_ARRAY_TAG_SHIFT = db.lookupIntConstant("Klass::_lh_array_tag_shift").intValue(); | |
| 67 LH_ARRAY_TAG_TYPE_VALUE = db.lookupIntConstant("Klass::_lh_array_tag_type_value").intValue(); | |
| 68 LH_ARRAY_TAG_OBJ_VALUE = db.lookupIntConstant("Klass::_lh_array_tag_obj_value").intValue(); | |
| 69 } | |
| 70 | |
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71 public Klass(Address addr) { |
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72 super(addr); |
| 0 | 73 } |
| 74 | |
| 75 // jvmdi support - see also class_status in VM code | |
| 76 public int getClassStatus() { | |
| 77 return 0; // overridden in derived classes | |
| 78 } | |
| 79 | |
| 80 public boolean isKlass() { return true; } | |
| 81 | |
| 82 // Fields | |
| 83 private static OopField javaMirror; | |
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84 private static MetadataField superField; |
| 0 | 85 private static IntField layoutHelper; |
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86 private static AddressField name; |
| 0 | 87 private static CIntField accessFlags; |
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88 private static MetadataField subklass; |
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89 private static MetadataField nextSibling; |
| 0 | 90 private static CIntField allocCount; |
| 91 | |
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92 private Address getValue(AddressField field) { |
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93 return addr.getAddressAt(field.getOffset()); |
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94 } |
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95 |
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96 protected Symbol getSymbol(AddressField field) { |
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97 return Symbol.create(addr.getAddressAt(field.getOffset())); |
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98 } |
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99 |
| 0 | 100 // Accessors for declared fields |
| 101 public Instance getJavaMirror() { return (Instance) javaMirror.getValue(this); } | |
| 102 public Klass getSuper() { return (Klass) superField.getValue(this); } | |
| 103 public Klass getJavaSuper() { return null; } | |
| 104 public int getLayoutHelper() { return (int) layoutHelper.getValue(this); } | |
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105 public Symbol getName() { return getSymbol(name); } |
| 0 | 106 public long getAccessFlags() { return accessFlags.getValue(this); } |
| 107 // Convenience routine | |
| 108 public AccessFlags getAccessFlagsObj(){ return new AccessFlags(getAccessFlags()); } | |
| 109 public Klass getSubklassKlass() { return (Klass) subklass.getValue(this); } | |
| 110 public Klass getNextSiblingKlass() { return (Klass) nextSibling.getValue(this); } | |
| 111 public long getAllocCount() { return allocCount.getValue(this); } | |
| 112 | |
| 113 // computed access flags - takes care of inner classes etc. | |
| 114 // This is closer to actual source level than getAccessFlags() etc. | |
| 115 public long computeModifierFlags() { | |
| 116 return 0L; // Unless overridden, modifier_flags is 0. | |
| 117 } | |
| 118 | |
| 119 // same as JVM_GetClassModifiers | |
| 120 public final long getClassModifiers() { | |
| 121 // unlike the VM counterpart we never have to deal with primitive type, | |
| 122 // because we operator on Klass and not an instance of java.lang.Class. | |
| 123 long flags = computeModifierFlags(); | |
| 124 if (isSuper()) { | |
| 125 flags |= JVM_ACC_SUPER; | |
| 126 } | |
| 127 return flags; | |
| 128 } | |
| 129 | |
| 130 // subclass check | |
| 131 public boolean isSubclassOf(Klass k) { | |
| 132 if (k != null) { | |
| 133 Klass t = this; | |
| 134 // Run up the super chain and check | |
| 135 while (t != null) { | |
| 136 if (t.equals(k)) return true; | |
| 137 t = t.getSuper(); | |
| 138 } | |
| 139 } | |
| 140 return false; | |
| 141 } | |
| 142 | |
| 143 // subtype check | |
| 144 public boolean isSubtypeOf(Klass k) { | |
| 145 return computeSubtypeOf(k); | |
| 146 } | |
| 147 | |
| 148 boolean computeSubtypeOf(Klass k) { | |
| 149 return isSubclassOf(k); | |
| 150 } | |
| 151 | |
| 152 // Find LCA (Least Common Ancester) in class heirarchy | |
| 153 public Klass lca( Klass k2 ) { | |
| 154 Klass k1 = this; | |
| 155 while ( true ) { | |
| 156 if ( k1.isSubtypeOf(k2) ) return k2; | |
| 157 if ( k2.isSubtypeOf(k1) ) return k1; | |
| 158 k1 = k1.getSuper(); | |
| 159 k2 = k2.getSuper(); | |
| 160 } | |
| 161 } | |
| 162 | |
| 163 public void printValueOn(PrintStream tty) { | |
| 164 tty.print("Klass"); | |
| 165 } | |
| 166 | |
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167 public void iterateFields(MetadataVisitor visitor) { |
| 0 | 168 visitor.doOop(javaMirror, true); |
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169 visitor.doMetadata(superField, true); |
| 0 | 170 visitor.doInt(layoutHelper, true); |
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171 // visitor.doOop(name, true); |
| 0 | 172 visitor.doCInt(accessFlags, true); |
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173 visitor.doMetadata(subklass, true); |
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174 visitor.doMetadata(nextSibling, true); |
| 0 | 175 visitor.doCInt(allocCount, true); |
| 176 } | |
| 177 | |
| 178 public long getObjectSize() { | |
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179 throw new RuntimeException("should not reach here"); |
| 0 | 180 } |
| 181 | |
| 182 /** Array class with specific rank */ | |
| 183 public Klass arrayKlass(int rank) { return arrayKlassImpl(false, rank); } | |
| 184 /** Array class with this klass as element type */ | |
| 185 public Klass arrayKlass() { return arrayKlassImpl(false); } | |
| 186 /** These will return null instead of allocating on the heap */ | |
| 187 public Klass arrayKlassOrNull(int rank) { return arrayKlassImpl(true, rank); } | |
| 188 public Klass arrayKlassOrNull() { return arrayKlassImpl(true); } | |
| 189 | |
| 190 public Klass arrayKlassImpl(boolean orNull, int rank) { | |
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191 throw new RuntimeException("array_klass should be dispatched to InstanceKlass, objArrayKlass or typeArrayKlass"); |
| 0 | 192 } |
| 193 | |
| 194 public Klass arrayKlassImpl(boolean orNull) { | |
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195 throw new RuntimeException("array_klass should be dispatched to InstanceKlass, objArrayKlass or typeArrayKlass"); |
| 0 | 196 } |
| 197 | |
| 198 // This returns the name in the form java/lang/String which isn't really a signature | |
| 199 // The subclasses override this to produce the correct form, eg | |
| 200 // Ljava/lang/String; For ArrayKlasses getName itself is the signature. | |
| 201 public String signature() { return getName().asString(); } | |
| 202 | |
| 203 // Convenience routines | |
| 204 public boolean isPublic() { return getAccessFlagsObj().isPublic(); } | |
| 205 public boolean isFinal() { return getAccessFlagsObj().isFinal(); } | |
| 206 public boolean isInterface() { return getAccessFlagsObj().isInterface(); } | |
| 207 public boolean isAbstract() { return getAccessFlagsObj().isAbstract(); } | |
| 208 public boolean isSuper() { return getAccessFlagsObj().isSuper(); } | |
| 209 public boolean isSynthetic() { return getAccessFlagsObj().isSynthetic(); } | |
| 210 public boolean hasFinalizer() { return getAccessFlagsObj().hasFinalizer(); } | |
| 211 public boolean isCloneable() { return getAccessFlagsObj().isCloneable(); } | |
| 212 public boolean hasVanillaConstructor() { return getAccessFlagsObj().hasVanillaConstructor(); } | |
| 213 public boolean hasMirandaMethods () { return getAccessFlagsObj().hasMirandaMethods(); } | |
| 214 } |