Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/oops/Klass.java @ 113:ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
| author | coleenp |
|---|---|
| date | Sun, 13 Apr 2008 17:43:42 -0400 |
| parents | a61af66fc99e |
| children | d1605aabd0a1 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 2000-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 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 | |
| 33 public class Klass extends Oop implements ClassConstants { | |
| 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"); | |
| 53 javaMirror = new OopField(type.getOopField("_java_mirror"), Oop.getHeaderSize()); | |
| 54 superField = new OopField(type.getOopField("_super"), Oop.getHeaderSize()); | |
| 55 layoutHelper = new IntField(type.getJIntField("_layout_helper"), Oop.getHeaderSize()); | |
| 56 name = new OopField(type.getOopField("_name"), Oop.getHeaderSize()); | |
| 57 accessFlags = new CIntField(type.getCIntegerField("_access_flags"), Oop.getHeaderSize()); | |
| 58 subklass = new OopField(type.getOopField("_subklass"), Oop.getHeaderSize()); | |
| 59 nextSibling = new OopField(type.getOopField("_next_sibling"), Oop.getHeaderSize()); | |
| 60 allocCount = new CIntField(type.getCIntegerField("_alloc_count"), Oop.getHeaderSize()); | |
| 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 | |
| 71 Klass(OopHandle handle, ObjectHeap heap) { | |
| 72 super(handle, heap); | |
| 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; | |
| 84 private static OopField superField; | |
| 85 private static IntField layoutHelper; | |
| 86 private static OopField name; | |
| 87 private static CIntField accessFlags; | |
| 88 private static OopField subklass; | |
| 89 private static OopField nextSibling; | |
| 90 private static CIntField allocCount; | |
| 91 | |
| 92 // Accessors for declared fields | |
| 93 public Instance getJavaMirror() { return (Instance) javaMirror.getValue(this); } | |
| 94 public Klass getSuper() { return (Klass) superField.getValue(this); } | |
| 95 public Klass getJavaSuper() { return null; } | |
| 96 public int getLayoutHelper() { return (int) layoutHelper.getValue(this); } | |
| 97 public Symbol getName() { return (Symbol) name.getValue(this); } | |
| 98 public long getAccessFlags() { return accessFlags.getValue(this); } | |
| 99 // Convenience routine | |
| 100 public AccessFlags getAccessFlagsObj(){ return new AccessFlags(getAccessFlags()); } | |
| 101 public Klass getSubklassKlass() { return (Klass) subklass.getValue(this); } | |
| 102 public Klass getNextSiblingKlass() { return (Klass) nextSibling.getValue(this); } | |
| 103 public long getAllocCount() { return allocCount.getValue(this); } | |
| 104 | |
| 105 // computed access flags - takes care of inner classes etc. | |
| 106 // This is closer to actual source level than getAccessFlags() etc. | |
| 107 public long computeModifierFlags() { | |
| 108 return 0L; // Unless overridden, modifier_flags is 0. | |
| 109 } | |
| 110 | |
| 111 // same as JVM_GetClassModifiers | |
| 112 public final long getClassModifiers() { | |
| 113 // unlike the VM counterpart we never have to deal with primitive type, | |
| 114 // because we operator on Klass and not an instance of java.lang.Class. | |
| 115 long flags = computeModifierFlags(); | |
| 116 if (isSuper()) { | |
| 117 flags |= JVM_ACC_SUPER; | |
| 118 } | |
| 119 return flags; | |
| 120 } | |
| 121 | |
| 122 // subclass check | |
| 123 public boolean isSubclassOf(Klass k) { | |
| 124 if (k != null) { | |
| 125 Klass t = this; | |
| 126 // Run up the super chain and check | |
| 127 while (t != null) { | |
| 128 if (t.equals(k)) return true; | |
| 129 t = t.getSuper(); | |
| 130 } | |
| 131 } | |
| 132 return false; | |
| 133 } | |
| 134 | |
| 135 // subtype check | |
| 136 public boolean isSubtypeOf(Klass k) { | |
| 137 return computeSubtypeOf(k); | |
| 138 } | |
| 139 | |
| 140 boolean computeSubtypeOf(Klass k) { | |
| 141 return isSubclassOf(k); | |
| 142 } | |
| 143 | |
| 144 // Find LCA (Least Common Ancester) in class heirarchy | |
| 145 public Klass lca( Klass k2 ) { | |
| 146 Klass k1 = this; | |
| 147 while ( true ) { | |
| 148 if ( k1.isSubtypeOf(k2) ) return k2; | |
| 149 if ( k2.isSubtypeOf(k1) ) return k1; | |
| 150 k1 = k1.getSuper(); | |
| 151 k2 = k2.getSuper(); | |
| 152 } | |
| 153 } | |
| 154 | |
| 155 public void printValueOn(PrintStream tty) { | |
| 156 tty.print("Klass"); | |
| 157 } | |
| 158 | |
| 159 public void iterateFields(OopVisitor visitor, boolean doVMFields) { | |
| 160 super.iterateFields(visitor, doVMFields); | |
| 161 if (doVMFields) { | |
| 162 visitor.doOop(javaMirror, true); | |
| 163 visitor.doOop(superField, true); | |
| 164 visitor.doInt(layoutHelper, true); | |
| 165 visitor.doOop(name, true); | |
| 166 visitor.doCInt(accessFlags, true); | |
| 167 visitor.doOop(subklass, true); | |
| 168 visitor.doOop(nextSibling, true); | |
| 169 visitor.doCInt(allocCount, true); | |
| 170 } | |
| 171 } | |
| 172 | |
| 173 public long getObjectSize() { | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
174 throw new RuntimeException("should not reach here"); |
| 0 | 175 } |
| 176 | |
| 177 /** Array class with specific rank */ | |
| 178 public Klass arrayKlass(int rank) { return arrayKlassImpl(false, rank); } | |
| 179 /** Array class with this klass as element type */ | |
| 180 public Klass arrayKlass() { return arrayKlassImpl(false); } | |
| 181 /** These will return null instead of allocating on the heap */ | |
| 182 public Klass arrayKlassOrNull(int rank) { return arrayKlassImpl(true, rank); } | |
| 183 public Klass arrayKlassOrNull() { return arrayKlassImpl(true); } | |
| 184 | |
| 185 public Klass arrayKlassImpl(boolean orNull, int rank) { | |
| 186 throw new RuntimeException("array_klass should be dispatched to instanceKlass, objArrayKlass or typeArrayKlass"); | |
| 187 } | |
| 188 | |
| 189 public Klass arrayKlassImpl(boolean orNull) { | |
| 190 throw new RuntimeException("array_klass should be dispatched to instanceKlass, objArrayKlass or typeArrayKlass"); | |
| 191 } | |
| 192 | |
| 193 // This returns the name in the form java/lang/String which isn't really a signature | |
| 194 // The subclasses override this to produce the correct form, eg | |
| 195 // Ljava/lang/String; For ArrayKlasses getName itself is the signature. | |
| 196 public String signature() { return getName().asString(); } | |
| 197 | |
| 198 // Convenience routines | |
| 199 public boolean isPublic() { return getAccessFlagsObj().isPublic(); } | |
| 200 public boolean isFinal() { return getAccessFlagsObj().isFinal(); } | |
| 201 public boolean isInterface() { return getAccessFlagsObj().isInterface(); } | |
| 202 public boolean isAbstract() { return getAccessFlagsObj().isAbstract(); } | |
| 203 public boolean isSuper() { return getAccessFlagsObj().isSuper(); } | |
| 204 public boolean isSynthetic() { return getAccessFlagsObj().isSynthetic(); } | |
| 205 public boolean hasFinalizer() { return getAccessFlagsObj().hasFinalizer(); } | |
| 206 public boolean isCloneable() { return getAccessFlagsObj().isCloneable(); } | |
| 207 public boolean hasVanillaConstructor() { return getAccessFlagsObj().hasVanillaConstructor(); } | |
| 208 public boolean hasMirandaMethods () { return getAccessFlagsObj().hasMirandaMethods(); } | |
| 209 } |