303 lines
11 KiB
HTML
303 lines
11 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<!--
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vim:sw=4:ts=4:et:
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This Source Code Form is subject to the terms of the Mozilla Public
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- License, v. 2.0. If a copy of the MPL was not distributed with this
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- file, You can obtain one at http://mozilla.org/MPL/2.0/.
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-->
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<html lang="en-US">
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<head>
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<meta charset="UTF-8" />
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<title>Leak Gauge</title>
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<style type="text/css">
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pre { margin: 0; }
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pre.output { border: medium solid; padding: 1em; margin: 1em; }
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</style>
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<script type="text/javascript">
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function runfile(file) {
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var result = "Results of processing log " + file.fileName + " :\n";
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var fileReader = new FileReader();
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fileReader.onload = function(e)
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{
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runContents(result, e.target.result);
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}
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fileReader.readAsText(file, "iso-8859-1");
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}
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function runContents(result, contents) {
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// A hash of objects (keyed by the first word of the line in the log)
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// that have two public methods, handle_line and dump (to be called using
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// call, above), along with any private data they need.
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var handlers = {
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"DOMWINDOW": {
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count: 0,
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windows: {},
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handle_line: function(line) {
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var match = line.match(/^([0-9a-f]*) (\S*)(.*)/);
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if (match) {
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var addr = match[1];
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var verb = match[2];
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var rest = match[3];
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if (verb == "created") {
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var m = rest.match(/ outer=([0-9a-f]*)$/);
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if (!m)
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throw "outer expected";
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this.windows[addr] = { outer: m[1] };
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++this.count;
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} else if (verb == "destroyed") {
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delete this.windows[addr];
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} else if (verb == "SetNewDocument") {
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var m = rest.match(/^ (.*)$/);
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if (!m)
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throw "URI expected";
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this.windows[addr][m[1]] = true;
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}
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}
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},
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dump: function() {
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for (var addr in this.windows) {
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var winobj = this.windows[addr];
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var outer = winobj.outer;
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delete winobj.outer;
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result += "Leaked " + (outer == "0" ? "outer" : "inner") +
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" window " + addr + " " +
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(outer == "0" ? "" : "(outer " + outer + ") ") +
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"at address " + addr + ".\n";
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for (var uri in winobj) {
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result += " ... with URI \"" + uri + "\".\n";
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}
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}
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},
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summary: function() {
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var len = 0;
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for (var w in this.windows)
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++len;
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result += 'Leaked ' + len + ' out of ' +
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this.count + " DOM Windows\n";
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}
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},
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"DOCUMENT": {
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count: 0,
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docs: {},
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handle_line: function(line) {
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var match = line.match(/^([0-9a-f]*) (\S*)(.*)/);
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if (match) {
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var addr = match[1];
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var verb = match[2];
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var rest = match[3];
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if (verb == "created") {
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this.docs[addr] = {};
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++this.count;
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} else if (verb == "destroyed") {
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delete this.docs[addr];
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} else if (verb == "ResetToURI" ||
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verb == "StartDocumentLoad") {
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var m = rest.match(/^ (.*)$/);
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if (!m)
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throw "URI expected";
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var uri = m[1];
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var doc_info = this.docs[addr];
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doc_info[uri] = true;
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if ("nim" in doc_info) {
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doc_info["nim"][uri] = true;
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}
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}
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}
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},
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dump: function() {
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for (var addr in this.docs) {
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var doc = this.docs[addr];
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result += "Leaked document at address " + addr + ".\n";
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for (var uri in doc) {
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if (uri != "nim") {
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result += " ... with URI \"" + uri + "\".\n";
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}
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}
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}
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},
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summary: function() {
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var len = 0;
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for (var w in this.docs)
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++len;
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result += 'Leaked ' + len + ' out of ' +
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this.count + " documents\n";
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}
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},
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"DOCSHELL": {
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count: 0,
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shells: {},
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handle_line: function(line) {
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var match = line.match(/^([0-9a-f]*) (\S*)(.*)/);
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if (match) {
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var addr = match[1];
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var verb = match[2];
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var rest = match[3];
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if (verb == "created") {
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this.shells[addr] = {};
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++this.count;
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} else if (verb == "destroyed") {
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delete this.shells[addr];
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} else if (verb == "InternalLoad" ||
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verb == "SetCurrentURI") {
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var m = rest.match(/^ (.*)$/);
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if (!m)
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throw "URI expected";
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this.shells[addr][m[1]] = true;
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}
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}
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},
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dump: function() {
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for (var addr in this.shells) {
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var doc = this.shells[addr];
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result += "Leaked docshell at address " + addr + ".\n";
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for (var uri in doc) {
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result += " ... which loaded URI \"" + uri + "\".\n";
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}
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}
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},
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summary: function() {
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var len = 0;
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for (var w in this.shells)
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++len;
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result += 'Leaked ' + len + ' out of ' +
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this.count + " docshells\n";
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}
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},
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"NODEINFOMANAGER": {
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count: 0,
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nims: {},
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handle_line: function(line) {
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var match = line.match(/^([0-9a-f]*) (\S*)(.*)/);
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if (match) {
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var addr = match[1];
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var verb = match[2];
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var rest = match[3];
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if (verb == "created") {
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this.nims[addr] = {};
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++this.count;
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} else if (verb == "destroyed") {
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delete this.nims[addr];
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} else if (verb == "Init") {
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var m = rest.match(/^ document=(.*)$/);
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if (!m)
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throw "document pointer expected";
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var nim_info = this.nims[addr];
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var doc = m[1];
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if (doc != "0") {
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var doc_info = handlers["DOCUMENT"].docs[doc];
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for (var uri in doc_info) {
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nim_info[uri] = true;
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}
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doc_info["nim"] = nim_info;
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}
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}
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}
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},
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dump: function() {
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for (var addr in this.nims) {
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var nim = this.nims[addr];
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result += "Leaked content nodes associated with node info manager at address " + addr + ".\n";
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for (var uri in nim) {
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result += " ... with document URI \"" + uri + "\".\n";
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}
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}
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},
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summary: function() {
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var len = 0;
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for (var w in this.nims)
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++len;
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result += 'Leaked content nodes in ' + len + ' out of ' +
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this.count + " documents\n";
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}
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}
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};
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var lines = contents.split(/[\r\n]+/);
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for (var j in lines) {
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var line = lines[j];
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// strip off initial "-", thread id, and thread pointer; separate
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// first word and rest
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var matches = line.match(/^\-?[0-9]*\[[0-9a-f]*\]: (\S*) (.*)$/);
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if (matches) {
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var handler = matches[1];
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var data = matches[2];
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if (typeof(handlers[handler]) != "undefined") {
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handlers[handler].handle_line(data);
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}
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}
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}
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for (var handler in handlers)
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handlers[handler].dump();
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if (result.length)
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result += "\n";
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result += "Summary:\n";
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for (var handler in handlers)
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handlers[handler].summary();
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result += "\n";
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var out = document.createElement("pre");
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out.className = "output";
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out.appendChild(document.createTextNode(result));
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document.body.appendChild(out);
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}
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function run() {
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var input = document.getElementById("fileinput");
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var files = input.files;
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for (var i = 0; i < files.length; ++i)
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runfile(files[i]);
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// So the user can process the same filename again (after
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// overwriting the log), clear the value on the form input so we
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// will always get an onchange event.
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input.value = "";
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}
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</script>
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</head>
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<body>
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<h1>Leak Gauge</h1>
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<pre>$Id: leak-gauge.html,v 1.8 2008/02/08 19:55:34 dbaron%dbaron.org Exp $</pre>
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<p>This script is designed to help testers isolate and simplify testcases
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for many classes of leaks (those that involve large graphs of core
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data structures) in Mozilla-based browsers. It is designed to print
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information about what has leaked by processing a log taken while
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running the browser. Such a log can be taken over a long session of
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normal browsing and then the log can be processed to find sites that
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leak. Once a site is known to leak, the logging can then be repeated
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to figure out under what conditions the leak occurs.</p>
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<p>The way to create this log is to set the environment variables:</p>
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<pre> NSPR_LOG_MODULES=DOMLeak:5,DocumentLeak:5,nsDocShellLeak:5,NodeInfoManagerLeak:5
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NSPR_LOG_FILE=nspr.log <i>(or any other filename of your choice)</i></pre>
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<p>in your shell and then run the program.</p>
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<ul>
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<li>In a Windows command prompt, set environment variables with
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<pre> set VAR=value</pre></li>
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<li> In an sh-based shell such as bash, set environment variables with
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<pre> export VAR=value</pre></li>
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<li>In a csh-based shell such as tcsh, set environment variables with
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<pre> setenv VAR value</pre></li>
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</ul>
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<p>Once you have this log from a complete run of the browser (you have
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to exit; otherwise it will look like everything leaked), you can load
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this page (be careful not to overwrite the log when starting the browser
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to load this page) and enter the filename of the log:</p>
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<p><input type="file" id="fileinput" onchange="run()"></p>
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<p>Then you'll see the output below, which will tell you which of
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certain core objects leaked and the URLs associated with those
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objects.</p>
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</body>
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</html>
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