| /* |
| * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.oops; |
| |
| import java.io.*; |
| import java.util.*; |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.runtime.*; |
| import sun.jvm.hotspot.types.*; |
| |
| public class Klass extends Metadata implements ClassConstants { |
| static { |
| VM.registerVMInitializedObserver(new Observer() { |
| public void update(Observable o, Object data) { |
| initialize(VM.getVM().getTypeDataBase()); |
| } |
| }); |
| } |
| |
| // anon-enum constants for _layout_helper. |
| public static int LH_INSTANCE_SLOW_PATH_BIT; |
| public static int LH_LOG2_ELEMENT_SIZE_SHIFT; |
| public static int LH_ELEMENT_TYPE_SHIFT; |
| public static int LH_HEADER_SIZE_SHIFT; |
| public static int LH_ARRAY_TAG_SHIFT; |
| public static int LH_ARRAY_TAG_TYPE_VALUE; |
| public static int LH_ARRAY_TAG_OBJ_VALUE; |
| |
| private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { |
| Type type = db.lookupType("Klass"); |
| javaMirror = new OopField(type.getOopField("_java_mirror"), 0); |
| superField = new MetadataField(type.getAddressField("_super"), 0); |
| layoutHelper = new IntField(type.getJIntField("_layout_helper"), 0); |
| name = type.getAddressField("_name"); |
| accessFlags = new CIntField(type.getCIntegerField("_access_flags"), 0); |
| try { |
| traceIDField = type.getField("_trace_id"); |
| } catch(Exception e) { |
| } |
| subklass = new MetadataField(type.getAddressField("_subklass"), 0); |
| nextSibling = new MetadataField(type.getAddressField("_next_sibling"), 0); |
| |
| LH_INSTANCE_SLOW_PATH_BIT = db.lookupIntConstant("Klass::_lh_instance_slow_path_bit").intValue(); |
| LH_LOG2_ELEMENT_SIZE_SHIFT = db.lookupIntConstant("Klass::_lh_log2_element_size_shift").intValue(); |
| LH_ELEMENT_TYPE_SHIFT = db.lookupIntConstant("Klass::_lh_element_type_shift").intValue(); |
| LH_HEADER_SIZE_SHIFT = db.lookupIntConstant("Klass::_lh_header_size_shift").intValue(); |
| LH_ARRAY_TAG_SHIFT = db.lookupIntConstant("Klass::_lh_array_tag_shift").intValue(); |
| LH_ARRAY_TAG_TYPE_VALUE = db.lookupIntConstant("Klass::_lh_array_tag_type_value").intValue(); |
| LH_ARRAY_TAG_OBJ_VALUE = db.lookupIntConstant("Klass::_lh_array_tag_obj_value").intValue(); |
| } |
| |
| public Klass(Address addr) { |
| super(addr); |
| } |
| |
| // jvmdi support - see also class_status in VM code |
| public int getClassStatus() { |
| return 0; // overridden in derived classes |
| } |
| |
| public boolean isKlass() { return true; } |
| |
| // Fields |
| private static OopField javaMirror; |
| private static MetadataField superField; |
| private static IntField layoutHelper; |
| private static AddressField name; |
| private static CIntField accessFlags; |
| private static MetadataField subklass; |
| private static MetadataField nextSibling; |
| private static sun.jvm.hotspot.types.Field traceIDField; |
| |
| private Address getValue(AddressField field) { |
| return addr.getAddressAt(field.getOffset()); |
| } |
| |
| protected Symbol getSymbol(AddressField field) { |
| return Symbol.create(addr.getAddressAt(field.getOffset())); |
| } |
| |
| // Accessors for declared fields |
| public Instance getJavaMirror() { return (Instance) javaMirror.getValue(this); } |
| public Klass getSuper() { return (Klass) superField.getValue(this); } |
| public Klass getJavaSuper() { return null; } |
| public int getLayoutHelper() { return (int) layoutHelper.getValue(this); } |
| public Symbol getName() { return getSymbol(name); } |
| public long getAccessFlags() { return accessFlags.getValue(this); } |
| // Convenience routine |
| public AccessFlags getAccessFlagsObj(){ return new AccessFlags(getAccessFlags()); } |
| public Klass getSubklassKlass() { return (Klass) subklass.getValue(this); } |
| public Klass getNextSiblingKlass() { return (Klass) nextSibling.getValue(this); } |
| |
| public long traceID() { |
| if (traceIDField == null) return 0; |
| return traceIDField.getJLong(addr); |
| } |
| |
| // computed access flags - takes care of inner classes etc. |
| // This is closer to actual source level than getAccessFlags() etc. |
| public long computeModifierFlags() { |
| return 0L; // Unless overridden, modifier_flags is 0. |
| } |
| |
| // same as JVM_GetClassModifiers |
| public final long getClassModifiers() { |
| // unlike the VM counterpart we never have to deal with primitive type, |
| // because we operator on Klass and not an instance of java.lang.Class. |
| long flags = computeModifierFlags(); |
| if (isSuper()) { |
| flags |= JVM_ACC_SUPER; |
| } |
| return flags; |
| } |
| |
| // subclass check |
| public boolean isSubclassOf(Klass k) { |
| if (k != null) { |
| Klass t = this; |
| // Run up the super chain and check |
| while (t != null) { |
| if (t.equals(k)) return true; |
| t = t.getSuper(); |
| } |
| } |
| return false; |
| } |
| |
| // subtype check |
| public boolean isSubtypeOf(Klass k) { |
| return computeSubtypeOf(k); |
| } |
| |
| boolean computeSubtypeOf(Klass k) { |
| return isSubclassOf(k); |
| } |
| |
| // Find LCA (Least Common Ancester) in class heirarchy |
| public Klass lca( Klass k2 ) { |
| Klass k1 = this; |
| while ( true ) { |
| if ( k1.isSubtypeOf(k2) ) return k2; |
| if ( k2.isSubtypeOf(k1) ) return k1; |
| k1 = k1.getSuper(); |
| k2 = k2.getSuper(); |
| } |
| } |
| |
| public void printValueOn(PrintStream tty) { |
| tty.print("Klass"); |
| } |
| |
| public void iterateFields(MetadataVisitor visitor) { |
| visitor.doOop(javaMirror, true); |
| visitor.doMetadata(superField, true); |
| visitor.doInt(layoutHelper, true); |
| // visitor.doOop(name, true); |
| visitor.doCInt(accessFlags, true); |
| visitor.doMetadata(subklass, true); |
| visitor.doMetadata(nextSibling, true); |
| } |
| |
| public long getObjectSize() { |
| throw new RuntimeException("should not reach here"); |
| } |
| |
| /** Array class with specific rank */ |
| public Klass arrayKlass(int rank) { return arrayKlassImpl(false, rank); } |
| /** Array class with this klass as element type */ |
| public Klass arrayKlass() { return arrayKlassImpl(false); } |
| /** These will return null instead of allocating on the heap */ |
| public Klass arrayKlassOrNull(int rank) { return arrayKlassImpl(true, rank); } |
| public Klass arrayKlassOrNull() { return arrayKlassImpl(true); } |
| |
| public Klass arrayKlassImpl(boolean orNull, int rank) { |
| throw new RuntimeException("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass"); |
| } |
| |
| public Klass arrayKlassImpl(boolean orNull) { |
| throw new RuntimeException("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass"); |
| } |
| |
| // This returns the name in the form java/lang/String which isn't really a signature |
| // The subclasses override this to produce the correct form, eg |
| // Ljava/lang/String; For ArrayKlasses getName itself is the signature. |
| public String signature() { return getName().asString(); } |
| |
| // Convenience routines |
| public boolean isPublic() { return getAccessFlagsObj().isPublic(); } |
| public boolean isFinal() { return getAccessFlagsObj().isFinal(); } |
| public boolean isInterface() { return getAccessFlagsObj().isInterface(); } |
| public boolean isAbstract() { return getAccessFlagsObj().isAbstract(); } |
| public boolean isSuper() { return getAccessFlagsObj().isSuper(); } |
| public boolean isSynthetic() { return getAccessFlagsObj().isSynthetic(); } |
| public boolean hasFinalizer() { return getAccessFlagsObj().hasFinalizer(); } |
| public boolean isCloneable() { return getAccessFlagsObj().isCloneable(); } |
| public boolean hasVanillaConstructor() { return getAccessFlagsObj().hasVanillaConstructor(); } |
| public boolean hasMirandaMethods () { return getAccessFlagsObj().hasMirandaMethods(); } |
| } |