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/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: AnalyzeHeap.java
* Written by: Dmitry Nadezhin, Sun Microsystems.
*
* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
*
* Electric(tm) is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Electric(tm) 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with Electric(tm); see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, Mass 02111-1307, USA.
*/
package com.sun.electric.database;
import java.io.BufferedInputStream;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
/**
* Class to analyze dump of JVM heap.
*/
public class AnalyzeHeap {
private static final boolean REFERENCES = true;
ArrayList objs = new ArrayList();
private AnalyzeHeap() {
}
public static void analyze(String fileName) {
AnalyzeHeap dumpHeap = new AnalyzeHeap();
try {
DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream(fileName)));
dumpHeap.read(in);
in.close();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println((dumpHeap.objs.size() - 1) + " objects");
dumpHeap.garbageCollect();
dumpHeap.dump("heapdump.txt");
dumpHeap.makePaths();
dumpHeap.dump("heapdump2.txt");
}
private void read(DataInputStream in) throws IOException {
int numObjs = in.readInt();
objs.clear();
while (objs.size() <= numObjs) {
objs.add(null);
}
ArrayList staticFields = new ArrayList();
ArrayList fields = new ArrayList();
for (;;) {
int h = in.readInt();
if (h == 0) {
break;
}
String className = in.readUTF();
int mode = in.readByte();
int staticLength = in.readInt();
staticFields.clear();
fields.clear();
for (int i = 0; i < staticLength; i++) {
staticFields.add(in.readUTF());
}
int length = in.readInt();
for (int i = 0; i < length; i++) {
fields.add(in.readUTF());
}
MyClass cls = new MyClass(className, mode, staticFields, fields);
objs.set(h, cls);
}
for (;;) {
int h = in.readInt();
if (h == 0) {
break;
}
MyString s = new MyString(in.readUTF());
objs.set(h, s);
}
for (int h = 1; h < objs.size(); h++) {
MyObject obj = objs.get(h);
if (obj == null) {
objs.set(h, new MyObject());
}
}
for (int h = 1;; h++) {
int classH = in.readInt();
if (classH == 0) {
break;
}
MyObject obj = objs.get(h);
MyClass cls = (MyClass) objs.get(classH);
obj.id = h;
obj.setClass(cls);
switch (cls.mode) {
case MyClass.ARRAY:
int length = in.readInt();
for (int i = 0; i < length; i++) {
int elem = in.readInt();
new Link(obj, MyField.getElem(i), objs.get(elem));
// System.out.println("\t" + elem);
}
break;
case MyClass.MAP:
int mapLength = in.readInt();
for (int i = 0; i < mapLength; i++) {
int key = in.readInt();
new Link(obj, MyField.getKey(i), objs.get(key));
int value = in.readInt();
new Link(obj, MyField.getElem(i), objs.get(value));
}
break;
case MyClass.STRING:
break;
case MyClass.CLASS:
obj.pathLink = new Link(null, ((MyClass) obj).classField, obj);
for (int i = 0; i < cls.fields.length; i++) {
int value = in.readInt();
new Link(obj, cls.fields[i], objs.get(value));
}
cls = (MyClass) objs.get(h);
for (int i = 0; i < cls.staticFields.length; i++) {
int value = in.readInt();
new Link(obj, cls.staticFields[i], objs.get(value));
}
break;
case MyClass.NORMAL:
for (int i = 0; i < cls.fields.length; i++) {
int value = in.readInt();
new Link(obj, cls.fields[i], objs.get(value));
}
break;
}
}
}
private void garbageCollect(MyObject obj, HashSet visited) {
if (obj == null || visited.contains(obj)) {
return;
}
visited.add(obj);
for (Iterator it = obj.linksFrom.iterator(); it.hasNext();) {
Link l = it.next();
if (!REFERENCES && l.field.referent) {
continue;
}
garbageCollect(l.to, visited);
}
}
private void garbageCollect() {
HashSet visited = new HashSet();
for (int h = 1; h < objs.size(); h++) {
MyObject obj = objs.get(h);
if (obj instanceof MyClass) {
garbageCollect(obj, visited);
}
}
int collected = 0, remained = 0;
for (int h = 1; h < objs.size(); h++) {
MyObject obj = objs.get(h);
if (obj == null) {
continue;
}
if (!visited.contains(obj)) {
objs.set(h, null);
collected++;
}
for (Iterator it = obj.linksTo.iterator(); it.hasNext();) {
Link l = it.next();
if (l.from != null && !visited.contains(l.from)) {
it.remove();
}
}
remained++;
}
System.out.println(collected + " objects collected " + remained + " remained");
}
private void makePaths() {
for (int k = 0; k < 100; k++) {
int named = stepPath(true, false, false);
if (named == 0) {
break;
}
}
if (REFERENCES) {
for (int k = 0; k < 100; k++) {
int named = stepPath(true, true, false);
if (named == 0) {
break;
}
}
}
// stepPath(true, false);
// for (int k = 0; k < 100; k++) {
// int named = stepPath(false, false, true);
// if (named == 0) break;
// }
countUnnamed();
int singleRefered = 0;
for (int h = 0; h < objs.size(); h++) {
MyObject obj = objs.get(h);
if (obj == null) {
continue;
}
if (!obj.isSingleOwned()) {
continue;
}
if (obj.linksTo.size() == 0) {
System.out.println(obj + " has no access");
continue;
}
singleRefered++;
Link pathLink = obj.linksTo.get(0);
assert obj.pathLink == null || obj.pathLink == pathLink;
obj.pathLink = pathLink;
;
}
System.out.println(singleRefered + " single-refered");
countUnnamed();
}
private int stepPath(boolean doMaps, boolean trackReferents, boolean verbose) {
HashSet named = new HashSet();
for (int h = 1; h < objs.size(); h++) {
MyObject obj = objs.get(h);
if (obj == null || obj.pathLink == null) {
continue;
}
if (named.contains(obj)) {
continue;
}
boolean doAll = doMaps || obj.cls.mode != MyClass.MAP && obj.cls.mode != MyClass.ARRAY;
for (Iterator it = obj.linksFrom.iterator(); it.hasNext();) {
Link l = it.next();
if (l.to == null || l.to.pathLink != null) {
continue;
}
if (!trackReferents && l.field.referent) {
continue;
}
boolean single = l.to.isSingleOwned();
if (doAll || single) {
l.to.pathLink = l;
named.add(l.to);
if (verbose && !single) {
System.out.println(l.to.toString());
}
}
}
}
System.out.println(named.size() + " named");
// countUnnamed();
return named.size();
}
private void countUnnamed() {
int unnamed = 0;
for (int h = 0; h < objs.size(); h++) {
MyObject obj = objs.get(h);
if (obj != null && obj.pathLink == null) {
unnamed++;
}
}
System.out.println(unnamed + " unnamed");
}
private void dump(String dumpName) {
try {
PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(dumpName)));
for (int h = 0; h < objs.size(); h++) {
MyObject obj = objs.get(h);
if (obj == null) {
continue;
}
out.println(obj.toString());
for (Iterator it = obj.linksFrom.iterator(); it.hasNext();) {
Link l = it.next();
if (l.to == null) {
continue;
}
out.println("\t" + l.field.name + "\t" + (l.to != null ? l.to.toString() : "null"));
}
out.println("\t-");
for (Iterator it = obj.linksTo.iterator(); it.hasNext();) {
Link l = it.next();
if (l == obj.pathLink) {
continue;
}
out.println("\t" + (l.from != null ? l.from.path() + "." : "") + l.field.name);
}
out.println();
}
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
class MyObject {
MyClass cls;
int id;
Link pathLink;
ArrayList linksFrom = new ArrayList();
ArrayList linksTo = new ArrayList(1);
void setClass(MyClass cls) {
this.cls = cls;
}
boolean isSingleOwned() {
return linksTo.size() <= 1;
}
public String path() {
if (pathLink == null) {
return (isSingleOwned() ? "!" : "*") + id;
} else if (pathLink.from == null) {
return pathLink.field.name;
} else {
return pathLink.from.path() + "." + pathLink.field.name;
}
}
public String toString() {
return path() + "(" + (isSingleOwned() ? "!" : "*") + id + ") " + cls.className;
}
}
class MyString extends MyObject {
String value;
MyString(String value) {
this.value = value;
}
public String toString() {
return super.toString() + " \"" + value + "\"";
}
}
class MyClass extends MyObject {
static final int NORMAL = 0;
static final int STRING = 1;
static final int ARRAY = 2;
static final int MAP = 3;
static final int CLASS = 4;
String className;
int mode;
MyField[] staticFields;
MyField[] fields;
MyField classField;
MyClass(String className, int mode, List staticFieldList, List fieldList) {
this.className = className;
classField = new MyField(0, MyField.CLASS, className);
this.mode = mode;
staticFields = new MyField[staticFieldList.size()];
for (int i = 0; i < staticFields.length; i++) {
staticFields[i] = new MyField(i, MyField.STATICFIELD, staticFieldList.get(i));
}
fields = new MyField[fieldList.size()];
for (int i = 0; i < fields.length; i++) {
String fieldName = fieldList.get(i);
MyField f = new MyField(i, MyField.FIELD, fieldName);
if (fieldName.equals("referent") && className.startsWith("java.lang.ref.")) {
f.referent = true;
}
fields[i] = f;
}
}
public String toString() {
String modeString = "";
switch (mode) {
case STRING:
modeString = " (STRING)";
break;
case ARRAY:
modeString = " (ARRAY)";
break;
case MAP:
modeString = " (MAP)";
break;
case CLASS:
modeString = " (CLASS)";
break;
}
return super.toString() + modeString;
}
}
class MyField {
static final int FIELD = 0;
static final int STATICFIELD = 1;
static final int ELEM = 2;
static final int KEY = 3;
static final int CLASS = 5;
int index;
int mode;
String name;
boolean referent;
static final ArrayList elems = new ArrayList();
static final ArrayList keys = new ArrayList();
MyField(int index, int mode, String name) {
this.index = index;
this.mode = mode;
this.name = name;
}
static MyField getElem(int index) {
while (elems.size() <= index) {
elems.add(new MyField(elems.size(), ELEM, elems.size() + ""));
}
return elems.get(index);
}
static MyField getKey(int index) {
while (keys.size() <= index) {
keys.add(new MyField(keys.size(), KEY, keys.size() + "k"));
}
return keys.get(index);
}
}
class Link {
MyObject from;
MyField field;
MyObject to;
Link(MyObject from, MyField field, MyObject to) {
this.from = from;
this.field = field;
this.to = to;
if (from != null) {
from.linksFrom.add(this);
}
if (to != null) {
to.linksTo.add(this);
}
}
}
