Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/oops/Klass.java @ 6169:cfa2c82f4c04
7175133: jinfo failed to get system properties after 6924259
Summary: String offset and count fields as fix of 6924259 were removed, and become optional. SA still use offset and count fields to read String contents and failed. Fix if they exist, use them other then use value field only to read, this keeps consistent with the changes in 6924259.
Reviewed-by: dholmes, mikael
Contributed-by: yumin.qi@oracle.com
author | minqi |
---|---|
date | Fri, 22 Jun 2012 15:35:30 -0700 |
parents | 1d1603768966 |
children | da91efe96a93 |
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/* * Copyright (c) 2000, 2011, 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 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 = type.getAddressField("_name"); 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 AddressField name; private static CIntField accessFlags; private static OopField subklass; private static OopField nextSibling; private static CIntField allocCount; private Address getValue(AddressField field) { return getHandle().getAddressAt(field.getOffset() + Oop.getHeaderSize()); } protected Symbol getSymbol(AddressField field) { return Symbol.create(getHandle().getAddressAt(field.getOffset() + Oop.getHeaderSize())); } // 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 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(); } }