/*
* Copyright (c) 2000, 2018, 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 sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.utilities.*;
// Super class for all fields in an object
public class Field {
Field(FieldIdentifier id, long offset, boolean isVMField) {
this.offset = offset;
this.id = id;
this.isVMField = isVMField;
}
/** Constructor for fields that are named in an InstanceKlass's
fields array (i.e., named, non-VM fields) */
Field(InstanceKlass holder, int fieldIndex) {
this.holder = holder;
this.fieldIndex = fieldIndex;
offset = holder.getFieldOffset(fieldIndex);
genericSignature = holder.getFieldGenericSignature(fieldIndex);
name = holder.getFieldName(fieldIndex);
id = new NamedFieldIdentifier(name.asString());
signature = holder.getFieldSignature(fieldIndex);
fieldType = new FieldType(signature);
short access = holder.getFieldAccessFlags(fieldIndex);
accessFlags = new AccessFlags(access);
}
private Symbol name;
private long offset;
private FieldIdentifier id;
private boolean isVMField;
// Java fields only
private InstanceKlass holder;
private FieldType fieldType;
private Symbol signature;
private Symbol genericSignature;
private AccessFlags accessFlags;
private int fieldIndex;
/** Returns the byte offset of the field within the object or klass */
public long getOffset() { return offset; }
/** Returns the identifier of the field */
public FieldIdentifier getID() { return id; }
public Symbol getName() { return name; }
/** Indicates whether this is a VM field */
public boolean isVMField() { return isVMField; }
/** Indicates whether this is a named field */
public boolean isNamedField() { return (id instanceof NamedFieldIdentifier); }
public void printOn(PrintStream tty) {
getID().printOn(tty);
tty.print(" {" + getOffset() + "} :");
}
/** (Named, non-VM fields only) Returns the InstanceKlass containing
this (static or non-static) field. */
public InstanceKlass getFieldHolder() {
return holder;
}
/** (Named, non-VM fields only) Returns the index in the fields
TypeArray for this field. Equivalent to the "index" in the VM's
fieldDescriptors. */
public int getFieldIndex() {
return fieldIndex;
}
/** (Named, non-VM fields only) Retrieves the access flags. */
public long getAccessFlags() { return accessFlags.getValue(); }
public AccessFlags getAccessFlagsObj() { return accessFlags; }
/** (Named, non-VM fields only) Returns the type of this field. */
public FieldType getFieldType() { return fieldType; }
/** (Named, non-VM fields only) Returns the signature of this
field. */
public Symbol getSignature() { return signature; }
public Symbol getGenericSignature() { return genericSignature; }
public boolean hasInitialValue() { return holder.getFieldInitialValueIndex(fieldIndex) != 0; }
//
// Following acccessors are for named, non-VM fields only
//
public boolean isPublic() { return accessFlags.isPublic(); }
public boolean isPrivate() { return accessFlags.isPrivate(); }
public boolean isProtected() { return accessFlags.isProtected(); }
public boolean isPackagePrivate() { return !isPublic() && !isPrivate() && !isProtected(); }
public boolean isStatic() { return accessFlags.isStatic(); }
public boolean isFinal() { return accessFlags.isFinal(); }
public boolean isVolatile() { return accessFlags.isVolatile(); }
public boolean isTransient() { return accessFlags.isTransient(); }
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