| /* |
| * Copyright (c) 1997, 2008, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| |
| /* |
| * The Original Code is HAT. The Initial Developer of the |
| * Original Code is Bill Foote, with contributions from others |
| * at JavaSoft/Sun. |
| */ |
| |
| package com.sun.tools.hat.internal.model; |
| |
| import java.io.IOException; |
| import com.sun.tools.hat.internal.parser.ReadBuffer; |
| |
| /** |
| * Represents Java instance |
| * |
| * @author Bill Foote |
| */ |
| public class JavaObject extends JavaLazyReadObject { |
| |
| private Object clazz; // Number before resolve |
| // JavaClass after resolve |
| /** |
| * Construct a new JavaObject. |
| * |
| * @param classID id of the class object |
| * @param offset The offset of field data |
| */ |
| public JavaObject(long classID, long offset) { |
| super(offset); |
| this.clazz = makeId(classID); |
| } |
| |
| public void resolve(Snapshot snapshot) { |
| if (clazz instanceof JavaClass) { |
| return; |
| } |
| if (clazz instanceof Number) { |
| long classID = getIdValue((Number)clazz); |
| clazz = snapshot.findThing(classID); |
| if (! (clazz instanceof JavaClass)) { |
| warn("Class " + Long.toHexString(classID) + " not found, " + |
| "adding fake class!"); |
| int length; |
| ReadBuffer buf = snapshot.getReadBuffer(); |
| int idSize = snapshot.getIdentifierSize(); |
| long lenOffset = getOffset() + 2*idSize + 4; |
| try { |
| length = buf.getInt(lenOffset); |
| } catch (IOException exp) { |
| throw new RuntimeException(exp); |
| } |
| clazz = snapshot.addFakeInstanceClass(classID, length); |
| } |
| } else { |
| throw new InternalError("should not reach here"); |
| } |
| |
| JavaClass cl = (JavaClass) clazz; |
| cl.resolve(snapshot); |
| |
| // while resolving, parse fields in verbose mode. |
| // but, getFields calls parseFields in non-verbose mode |
| // to avoid printing warnings repeatedly. |
| parseFields(getValue(), true); |
| |
| cl.addInstance(this); |
| super.resolve(snapshot); |
| } |
| |
| /** |
| * Are we the same type as other? We are iff our clazz is the |
| * same type as other's. |
| */ |
| public boolean isSameTypeAs(JavaThing other) { |
| if (!(other instanceof JavaObject)) { |
| return false; |
| } |
| JavaObject oo = (JavaObject) other; |
| return getClazz().equals(oo.getClazz()); |
| } |
| |
| /** |
| * Return our JavaClass object. This may only be called after resolve. |
| */ |
| public JavaClass getClazz() { |
| return (JavaClass) clazz; |
| } |
| |
| public JavaThing[] getFields() { |
| // pass false to verbose mode so that dereference |
| // warnings are not printed. |
| return parseFields(getValue(), false); |
| } |
| |
| // returns the value of field of given name |
| public JavaThing getField(String name) { |
| JavaThing[] flds = getFields(); |
| JavaField[] instFields = getClazz().getFieldsForInstance(); |
| for (int i = 0; i < instFields.length; i++) { |
| if (instFields[i].getName().equals(name)) { |
| return flds[i]; |
| } |
| } |
| return null; |
| } |
| |
| public int compareTo(JavaThing other) { |
| if (other instanceof JavaObject) { |
| JavaObject oo = (JavaObject) other; |
| return getClazz().getName().compareTo(oo.getClazz().getName()); |
| } |
| return super.compareTo(other); |
| } |
| |
| public void visitReferencedObjects(JavaHeapObjectVisitor v) { |
| super.visitReferencedObjects(v); |
| JavaThing[] flds = getFields(); |
| for (int i = 0; i < flds.length; i++) { |
| if (flds[i] != null) { |
| if (v.mightExclude() |
| && v.exclude(getClazz().getClassForField(i), |
| getClazz().getFieldForInstance(i))) |
| { |
| // skip it |
| } else if (flds[i] instanceof JavaHeapObject) { |
| v.visit((JavaHeapObject) flds[i]); |
| } |
| } |
| } |
| } |
| |
| public boolean refersOnlyWeaklyTo(Snapshot ss, JavaThing other) { |
| if (ss.getWeakReferenceClass() != null) { |
| final int referentFieldIndex = ss.getReferentFieldIndex(); |
| if (ss.getWeakReferenceClass().isAssignableFrom(getClazz())) { |
| // |
| // REMIND: This introduces a dependency on the JDK |
| // implementation that is undesirable. |
| JavaThing[] flds = getFields(); |
| for (int i = 0; i < flds.length; i++) { |
| if (i != referentFieldIndex && flds[i] == other) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Describe the reference that this thing has to target. This will only |
| * be called if target is in the array returned by getChildrenForRootset. |
| */ |
| public String describeReferenceTo(JavaThing target, Snapshot ss) { |
| JavaThing[] flds = getFields(); |
| for (int i = 0; i < flds.length; i++) { |
| if (flds[i] == target) { |
| JavaField f = getClazz().getFieldForInstance(i); |
| return "field " + f.getName(); |
| } |
| } |
| return super.describeReferenceTo(target, ss); |
| } |
| |
| public String toString() { |
| if (getClazz().isString()) { |
| JavaThing value = getField("value"); |
| if (value instanceof JavaValueArray) { |
| return ((JavaValueArray)value).valueString(); |
| } else { |
| return "null"; |
| } |
| } else { |
| return super.toString(); |
| } |
| } |
| |
| // Internals only below this point |
| |
| /* |
| * Java instance record (HPROF_GC_INSTANCE_DUMP) looks as below: |
| * |
| * object ID |
| * stack trace serial number (int) |
| * class ID |
| * data length (int) |
| * byte[length] |
| */ |
| protected final int readValueLength() throws IOException { |
| JavaClass cl = getClazz(); |
| int idSize = cl.getIdentifierSize(); |
| long lengthOffset = getOffset() + 2*idSize + 4; |
| return cl.getReadBuffer().getInt(lengthOffset); |
| } |
| |
| protected final byte[] readValue() throws IOException { |
| JavaClass cl = getClazz(); |
| int idSize = cl.getIdentifierSize(); |
| ReadBuffer buf = cl.getReadBuffer(); |
| long offset = getOffset() + 2*idSize + 4; |
| int length = buf.getInt(offset); |
| if (length == 0) { |
| return Snapshot.EMPTY_BYTE_ARRAY; |
| } else { |
| byte[] res = new byte[length]; |
| buf.get(offset + 4, res); |
| return res; |
| } |
| } |
| |
| private JavaThing[] parseFields(byte[] data, boolean verbose) { |
| JavaClass cl = getClazz(); |
| int target = cl.getNumFieldsForInstance(); |
| JavaField[] fields = cl.getFields(); |
| JavaThing[] fieldValues = new JavaThing[target]; |
| Snapshot snapshot = cl.getSnapshot(); |
| int idSize = snapshot.getIdentifierSize(); |
| int fieldNo = 0; |
| // In the dump file, the fields are stored in this order: |
| // fields of most derived class (immediate class) are stored |
| // first and then the super class and so on. In this object, |
| // fields are stored in the reverse ("natural") order. i.e., |
| // fields of most super class are stored first. |
| |
| // target variable is used to compensate for the fact that |
| // the dump file starts field values from the leaf working |
| // upwards in the inheritance hierarchy, whereas JavaObject |
| // starts with the top of the inheritance hierarchy and works down. |
| target -= fields.length; |
| JavaClass currClass = cl; |
| int index = 0; |
| for (int i = 0; i < fieldValues.length; i++, fieldNo++) { |
| while (fieldNo >= fields.length) { |
| currClass = currClass.getSuperclass(); |
| fields = currClass.getFields(); |
| fieldNo = 0; |
| target -= fields.length; |
| } |
| JavaField f = fields[fieldNo]; |
| char sig = f.getSignature().charAt(0); |
| switch (sig) { |
| case 'L': |
| case '[': { |
| long id = objectIdAt(index, data); |
| index += idSize; |
| JavaObjectRef ref = new JavaObjectRef(id); |
| fieldValues[target+fieldNo] = ref.dereference(snapshot, f, verbose); |
| break; |
| } |
| case 'Z': { |
| byte value = byteAt(index, data); |
| index++; |
| fieldValues[target+fieldNo] = new JavaBoolean(value != 0); |
| break; |
| } |
| case 'B': { |
| byte value = byteAt(index, data); |
| index++; |
| fieldValues[target+fieldNo] = new JavaByte(value); |
| break; |
| } |
| case 'S': { |
| short value = shortAt(index, data); |
| index += 2; |
| fieldValues[target+fieldNo] = new JavaShort(value); |
| break; |
| } |
| case 'C': { |
| char value = charAt(index, data); |
| index += 2; |
| fieldValues[target+fieldNo] = new JavaChar(value); |
| break; |
| } |
| case 'I': { |
| int value = intAt(index, data); |
| index += 4; |
| fieldValues[target+fieldNo] = new JavaInt(value); |
| break; |
| } |
| case 'J': { |
| long value = longAt(index, data); |
| index += 8; |
| fieldValues[target+fieldNo] = new JavaLong(value); |
| break; |
| } |
| case 'F': { |
| float value = floatAt(index, data); |
| index += 4; |
| fieldValues[target+fieldNo] = new JavaFloat(value); |
| break; |
| } |
| case 'D': { |
| double value = doubleAt(index, data); |
| index += 8; |
| fieldValues[target+fieldNo] = new JavaDouble(value); |
| break; |
| } |
| default: |
| throw new RuntimeException("invalid signature: " + sig); |
| } |
| } |
| return fieldValues; |
| } |
| |
| private void warn(String msg) { |
| System.out.println("WARNING: " + msg); |
| } |
| } |