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/*
* Copyright 2000-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.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 Oop 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"), Oop.getHeaderSize());
superField = new OopField(type.getOopField("_super"), Oop.getHeaderSize());
layoutHelper = new IntField(type.getJIntField("_layout_helper"), Oop.getHeaderSize());
name = new OopField(type.getOopField("_name"), Oop.getHeaderSize());
accessFlags = new CIntField(type.getCIntegerField("_access_flags"), Oop.getHeaderSize());
subklass = new OopField(type.getOopField("_subklass"), Oop.getHeaderSize());
nextSibling = new OopField(type.getOopField("_next_sibling"), Oop.getHeaderSize());
allocCount = new CIntField(type.getCIntegerField("_alloc_count"), Oop.getHeaderSize());
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();
}
Klass(OopHandle handle, ObjectHeap heap) {
super(handle, heap);
}
// 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 OopField superField;
private static IntField layoutHelper;
private static OopField name;
private static CIntField accessFlags;
private static OopField subklass;
private static OopField nextSibling;
private static CIntField allocCount;
// 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 (Symbol) name.getValue(this); }
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 getAllocCount() { return allocCount.getValue(this); }
// 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(OopVisitor visitor, boolean doVMFields) {
super.iterateFields(visitor, doVMFields);
if (doVMFields) {
visitor.doOop(javaMirror, true);
visitor.doOop(superField, true);
visitor.doInt(layoutHelper, true);
visitor.doOop(name, true);
visitor.doCInt(accessFlags, true);
visitor.doOop(subklass, true);
visitor.doOop(nextSibling, true);
visitor.doCInt(allocCount, 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(); }
}
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