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Diffstat (limited to 'toolkit/components/aboutmemory/content/aboutMemory.js')
| -rw-r--r-- | toolkit/components/aboutmemory/content/aboutMemory.js | 2478 |
1 files changed, 2478 insertions, 0 deletions
diff --git a/toolkit/components/aboutmemory/content/aboutMemory.js b/toolkit/components/aboutmemory/content/aboutMemory.js new file mode 100644 index 0000000000..7cb5ccefb3 --- /dev/null +++ b/toolkit/components/aboutmemory/content/aboutMemory.js @@ -0,0 +1,2478 @@ +/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*-*/ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +// You can direct about:memory to immediately load memory reports from a file +// by providing a file= query string. For example, +// +// about:memory?file=/home/username/reports.json.gz +// +// "file=" is not case-sensitive. We'll URI-unescape the contents of the +// "file=" argument, and obviously the filename is case-sensitive iff you're on +// a case-sensitive filesystem. If you specify more than one "file=" argument, +// only the first one is used. + +"use strict"; + +// --------------------------------------------------------------------------- + +let CC = Components.Constructor; + +const KIND_NONHEAP = Ci.nsIMemoryReporter.KIND_NONHEAP; +const KIND_HEAP = Ci.nsIMemoryReporter.KIND_HEAP; +const KIND_OTHER = Ci.nsIMemoryReporter.KIND_OTHER; + +const UNITS_BYTES = Ci.nsIMemoryReporter.UNITS_BYTES; +const UNITS_COUNT = Ci.nsIMemoryReporter.UNITS_COUNT; +const UNITS_COUNT_CUMULATIVE = Ci.nsIMemoryReporter.UNITS_COUNT_CUMULATIVE; +const UNITS_PERCENTAGE = Ci.nsIMemoryReporter.UNITS_PERCENTAGE; + +const { XPCOMUtils } = ChromeUtils.importESModule( + "resource://gre/modules/XPCOMUtils.sys.mjs" +); +const { NetUtil } = ChromeUtils.import("resource://gre/modules/NetUtil.jsm"); +ChromeUtils.defineESModuleGetters(this, { + Downloads: "resource://gre/modules/Downloads.sys.mjs", + FileUtils: "resource://gre/modules/FileUtils.sys.mjs", +}); + +XPCOMUtils.defineLazyGetter(this, "nsBinaryStream", () => + CC( + "@mozilla.org/binaryinputstream;1", + "nsIBinaryInputStream", + "setInputStream" + ) +); +XPCOMUtils.defineLazyGetter(this, "nsFile", () => + CC("@mozilla.org/file/local;1", "nsIFile", "initWithPath") +); +XPCOMUtils.defineLazyGetter(this, "nsGzipConverter", () => + CC( + "@mozilla.org/streamconv;1?from=gzip&to=uncompressed", + "nsIStreamConverter" + ) +); + +let gMgr = Cc["@mozilla.org/memory-reporter-manager;1"].getService( + Ci.nsIMemoryReporterManager +); + +const gPageName = "about:memory"; +document.title = gPageName; + +const gMainProcessPrefix = "Main Process"; + +const gFilterUpdateDelayMS = 300; + +let gIsDiff = false; + +let gCurrentReports = []; +let gCurrentHasMozMallocUsableSize = false; +let gCurrentIsDiff = false; + +let gFilter = ""; + +// --------------------------------------------------------------------------- + +// Forward slashes in URLs in paths are represented with backslashes to avoid +// being mistaken for path separators. Paths/names where this hasn't been +// undone are prefixed with "unsafe"; the rest are prefixed with "safe". +function flipBackslashes(aUnsafeStr) { + // Save memory by only doing the replacement if it's necessary. + return !aUnsafeStr.includes("\\") + ? aUnsafeStr + : aUnsafeStr.replace(/\\/g, "/"); +} + +const gAssertionFailureMsgPrefix = "aboutMemory.js assertion failed: "; + +// This is used for things that should never fail, and indicate a defect in +// this file if they do. +function assert(aCond, aMsg) { + if (!aCond) { + reportAssertionFailure(aMsg); + throw new Error(gAssertionFailureMsgPrefix + aMsg); + } +} + +// This is used for malformed input from memory reporters. +function assertInput(aCond, aMsg) { + if (!aCond) { + throw new Error(`Invalid memory report(s): ${aMsg}`); + } +} + +function handleException(aEx) { + let str = "" + aEx; + if (str.startsWith(gAssertionFailureMsgPrefix)) { + // Argh, assertion failure within this file! Give up. + throw aEx; + } else { + // File or memory reporter problem. Print a message. + updateMainAndFooter(str, NO_TIMESTAMP, HIDE_FOOTER, "badInputWarning"); + } +} + +function reportAssertionFailure(aMsg) { + let debug = Cc["@mozilla.org/xpcom/debug;1"].getService(Ci.nsIDebug2); + if (debug.isDebugBuild) { + debug.assertion(aMsg, "false", "aboutMemory.js", 0); + } +} + +function debug(aVal) { + let section = appendElement(document.body, "div", "section"); + appendElementWithText(section, "div", "debug", JSON.stringify(aVal)); +} + +function stringMatchesFilter(aString, aFilter) { + assert( + typeof aFilter == "string" || aFilter instanceof RegExp, + "unexpected aFilter type" + ); + + return typeof aFilter == "string" + ? aString.includes(aFilter) + : aFilter.test(aString); +} + +// --------------------------------------------------------------------------- + +window.onunload = function() {}; + +// --------------------------------------------------------------------------- + +// The <div> holding everything but the header and footer (if they're present). +// It's what is updated each time the page changes. +let gMain; + +// The <div> holding the footer. +let gFooter; + +// The "verbose" checkbox. +let gVerbose; + +// The "anonymize" checkbox. +let gAnonymize; + +// Values for the |aFooterAction| argument to updateTitleMainAndFooter. +const HIDE_FOOTER = 0; +const SHOW_FOOTER = 1; + +// Values for the |aShowTimestamp| argument to updateTitleMainAndFooter. +const NO_TIMESTAMP = 0; +const SHOW_TIMESTAMP = 1; + +function updateTitleMainAndFooter( + aTitleNote, + aMsg, + aShowTimestamp, + aFooterAction, + aClassName +) { + document.title = gPageName; + if (aTitleNote) { + document.title += ` (${aTitleNote})`; + } + + // Clear gMain by replacing it with an empty node. + let tmp = gMain.cloneNode(false); + gMain.parentNode.replaceChild(tmp, gMain); + gMain = tmp; + + gMain.classList.remove("hidden"); + gMain.classList.remove("verbose"); + gMain.classList.remove("non-verbose"); + if (gVerbose) { + gMain.classList.add(gVerbose.checked ? "verbose" : "non-verbose"); + } + + let msgElement; + if (aMsg) { + let className = "section"; + if (aClassName) { + className = className + " " + aClassName; + } + if (aShowTimestamp == SHOW_TIMESTAMP) { + // JS has many options for pretty-printing timestamps. We use + // toISOString() because it has sub-second granularity, which is useful + // if you quickly and repeatedly click one of the buttons. + aMsg += ` (${new Date().toISOString()})`; + } + msgElement = appendElementWithText(gMain, "div", className, aMsg); + } + + switch (aFooterAction) { + case HIDE_FOOTER: + gFooter.classList.add("hidden"); + break; + case SHOW_FOOTER: + gFooter.classList.remove("hidden"); + break; + default: + assert(false, "bad footer action in updateTitleMainAndFooter"); + } + return msgElement; +} + +function updateMainAndFooter(aMsg, aShowTimestamp, aFooterAction, aClassName) { + return updateTitleMainAndFooter( + "", + aMsg, + aShowTimestamp, + aFooterAction, + aClassName + ); +} + +function appendTextNode(aP, aText) { + let e = document.createTextNode(aText); + aP.appendChild(e); + return e; +} + +function appendElement(aP, aTagName, aClassName) { + let e = newElement(aTagName, aClassName); + aP.appendChild(e); + return e; +} + +function appendElementWithText(aP, aTagName, aClassName, aText) { + let e = appendElement(aP, aTagName, aClassName); + // Setting textContent clobbers existing children, but there are none. More + // importantly, it avoids creating a JS-land object for the node, saving + // memory. + e.textContent = aText; + return e; +} + +function newElement(aTagName, aClassName) { + let e = document.createElement(aTagName); + if (aClassName) { + e.className = aClassName; + } + return e; +} + +// --------------------------------------------------------------------------- + +const explicitTreeDescription = + "This tree covers explicit memory allocations by the application. It includes \ +\n\n\ +* all allocations made at the heap allocation level (via functions such as malloc, \ +calloc, realloc, memalign, operator new, and operator new[]) that have not been \ +explicitly decommitted (i.e. evicted from memory and swap), and \ +\n\n\ +* some allocations (those covered by memory reporters) made at the operating \ +system level (via calls to functions such as VirtualAlloc, vm_allocate, and \ +mmap), \ +\n\n\ +* where possible, the overhead of the heap allocator itself.\ +\n\n\ +It excludes memory that is mapped implicitly such as code and data segments, \ +and thread stacks. \ +\n\n\ +'explicit' is not guaranteed to cover every explicit allocation, but it does cover \ +most (including the entire heap), and therefore it is the single best number to \ +focus on when trying to reduce memory usage."; + +// --------------------------------------------------------------------------- + +function appendButton(aP, aTitle, aOnClick, aText, aId) { + let b = appendElementWithText(aP, "button", "", aText); + b.title = aTitle; + b.onclick = aOnClick; + if (aId) { + b.id = aId; + } + return b; +} + +function appendHiddenFileInput(aP, aId, aChangeListener) { + let input = appendElementWithText(aP, "input", "hidden", ""); + input.type = "file"; + input.id = aId; // used in testing + input.addEventListener("change", aChangeListener); + return input; +} + +window.onload = function() { + // Generate the header. + + let header = appendElement(document.body, "div", "ancillary"); + + // A hidden file input element that can be invoked when necessary. + let fileInput1 = appendHiddenFileInput(header, "fileInput1", function() { + let file = this.files[0]; + let filename = file.mozFullPath; + updateAboutMemoryFromFile(filename); + }); + + // Ditto. + let fileInput2 = appendHiddenFileInput(header, "fileInput2", function(aElem) { + let file = this.files[0]; + // First time around, we stash a copy of the filename and reinvoke. Second + // time around we do the diff and display. + if (!this.filename1) { + this.filename1 = file.mozFullPath; + + // aElem.skipClick is only true when testing -- it allows fileInput2's + // onchange handler to be re-called without having to go via the file + // picker. + if (!aElem.skipClick) { + this.click(); + } + } else { + let filename1 = this.filename1; + delete this.filename1; + updateAboutMemoryFromTwoFiles(filename1, file.mozFullPath); + } + }); + + const CuDesc = "Measure current memory reports and show."; + const LdDesc = "Load memory reports from file and show."; + const DfDesc = + "Load memory report data from two files and show the difference."; + + const SvDesc = "Save memory reports to file."; + + const GCDesc = "Do a global garbage collection."; + const CCDesc = "Do a cycle collection."; + const MMDesc = + 'Send three "heap-minimize" notifications in a ' + + "row. Each notification triggers a global garbage " + + "collection followed by a cycle collection, and causes the " + + "process to reduce memory usage in other ways, e.g. by " + + "flushing various caches."; + + const GCAndCCLogDesc = + "Save garbage collection log and concise cycle " + + "collection log.\n" + + "WARNING: These logs may be large (>1GB)."; + const GCAndCCAllLogDesc = + "Save garbage collection log and verbose cycle " + + "collection log.\n" + + "WARNING: These logs may be large (>1GB)."; + + const DMDEnabledDesc = + "Analyze memory reports coverage and save the " + + "output to the temp directory.\n"; + const DMDDisabledDesc = + "DMD is not running. Please re-start with $DMD and " + + "the other relevant environment variables set " + + "appropriately."; + + let ops = appendElement(header, "div", ""); + + let row1 = appendElement(ops, "div", "opsRow"); + + let labelDiv1 = appendElementWithText( + row1, + "div", + "opsRowLabel", + "Show memory reports" + ); + labelDiv1.setAttribute("role", "heading"); + labelDiv1.setAttribute("aria-level", "1"); + let label1 = appendElementWithText(labelDiv1, "label", ""); + gVerbose = appendElement(label1, "input", ""); + gVerbose.type = "checkbox"; + gVerbose.id = "verbose"; // used for testing + appendTextNode(label1, "verbose"); + + // The "measureButton" id is used for testing. + appendButton(row1, CuDesc, doMeasure, "Measure", "measureButton"); + appendButton(row1, LdDesc, () => fileInput1.click(), "Load…"); + appendButton(row1, DfDesc, () => fileInput2.click(), "Load and diff…"); + + let row2 = appendElement(ops, "div", "opsRow"); + + let labelDiv2 = appendElementWithText( + row2, + "div", + "opsRowLabel", + "Save memory reports" + ); + labelDiv2.setAttribute("role", "heading"); + labelDiv2.setAttribute("aria-level", "1"); + appendButton(row2, SvDesc, saveReportsToFile, "Measure and save…"); + + // XXX: this isn't a great place for this checkbox, but I can't think of + // anywhere better. + let label2 = appendElementWithText(labelDiv2, "label", ""); + gAnonymize = appendElement(label2, "input", ""); + gAnonymize.type = "checkbox"; + appendTextNode(label2, "anonymize"); + + let row3 = appendElement(ops, "div", "opsRow"); + + let labelDiv3 = appendElementWithText( + row3, + "div", + "opsRowLabel", + "Free memory" + ); + labelDiv3.setAttribute("role", "heading"); + labelDiv3.setAttribute("aria-level", "1"); + appendButton(row3, GCDesc, doGC, "GC"); + appendButton(row3, CCDesc, doCC, "CC"); + appendButton(row3, MMDesc, doMMU, "Minimize memory usage"); + + let row4 = appendElement(ops, "div", "opsRow"); + + let labelDiv4 = appendElementWithText( + row4, + "div", + "opsRowLabel", + "Save GC & CC logs" + ); + labelDiv4.setAttribute("role", "heading"); + labelDiv4.setAttribute("aria-level", "1"); + appendButton( + row4, + GCAndCCLogDesc, + saveGCLogAndConciseCCLog, + "Save concise", + "saveLogsConcise" + ); + appendButton( + row4, + GCAndCCAllLogDesc, + saveGCLogAndVerboseCCLog, + "Save verbose", + "saveLogsVerbose" + ); + + // Three cases here: + // - DMD is disabled (i.e. not built): don't show the button. + // - DMD is enabled but is not running: show the button, but disable it. + // - DMD is enabled and is running: show the button and enable it. + if (gMgr.isDMDEnabled) { + let row5 = appendElement(ops, "div", "opsRow"); + + let labelDiv5 = appendElementWithText( + row5, + "div", + "opsRowLabel", + "Save DMD output" + ); + labelDiv5.setAttribute("role", "heading"); + labelDiv5.setAttribute("aria-level", "1"); + let enableButtons = gMgr.isDMDRunning; + + let dmdButton = appendButton( + row5, + enableButtons ? DMDEnabledDesc : DMDDisabledDesc, + doDMD, + "Save" + ); + dmdButton.disabled = !enableButtons; + } + + // Generate the main div, where content ("section" divs) will go. It's + // hidden at first. + + gMain = appendElement(document.body, "div", ""); + gMain.id = "mainDiv"; + + // Generate the footer. It's hidden at first. + + gFooter = appendElement(document.body, "div", "ancillary hidden"); + gFooter.setAttribute("role", "contentinfo"); + + if (Services.policies.isAllowed("aboutSupport")) { + let a = appendElementWithText( + gFooter, + "a", + "option", + "Troubleshooting information" + ); + a.href = "about:support"; + } + + let legendText1 = + "Click on a non-leaf node in a tree to expand ('++') " + + "or collapse ('--') its children."; + let legendText2 = + "Hover the pointer over the name of a memory report " + + "to see a description of what it measures."; + + appendElementWithText(gFooter, "div", "legend", legendText1); + appendElementWithText(gFooter, "div", "legend hiddenOnMobile", legendText2); + + // See if we're loading from a file. (Because about:memory is a non-standard + // URL, location.search is undefined, so we have to use location.href + // instead.) + let search = location.href.split("?")[1]; + if (search) { + let searchSplit = search.split("&"); + for (let s of searchSplit) { + if (s.toLowerCase().startsWith("file=")) { + let filename = s.substring("file=".length); + updateAboutMemoryFromFile(decodeURIComponent(filename)); + return; + } + } + } +}; + +// --------------------------------------------------------------------------- + +function doGC() { + Services.obs.notifyObservers(null, "child-gc-request"); + Cu.forceGC(); + updateMainAndFooter( + "Garbage collection completed", + SHOW_TIMESTAMP, + HIDE_FOOTER + ); +} + +function doCC() { + Services.obs.notifyObservers(null, "child-cc-request"); + window.windowUtils.cycleCollect(); + updateMainAndFooter( + "Cycle collection completed", + SHOW_TIMESTAMP, + HIDE_FOOTER + ); +} + +function doMMU() { + Services.obs.notifyObservers(null, "child-mmu-request"); + gMgr.minimizeMemoryUsage(() => + updateMainAndFooter( + "Memory minimization completed", + SHOW_TIMESTAMP, + HIDE_FOOTER + ) + ); +} + +function doMeasure() { + updateAboutMemoryFromReporters(); +} + +function saveGCLogAndConciseCCLog() { + dumpGCLogAndCCLog(false); +} + +function saveGCLogAndVerboseCCLog() { + dumpGCLogAndCCLog(true); +} + +function doDMD() { + updateMainAndFooter( + "Saving memory reports and DMD output...", + NO_TIMESTAMP, + HIDE_FOOTER + ); + try { + let dumper = Cc["@mozilla.org/memory-info-dumper;1"].getService( + Ci.nsIMemoryInfoDumper + ); + + dumper.dumpMemoryInfoToTempDir( + /* identifier = */ "", + gAnonymize.checked, + /* minimize = */ false + ); + updateMainAndFooter( + "Saved memory reports and DMD reports analysis " + + "to the temp directory", + SHOW_TIMESTAMP, + HIDE_FOOTER + ); + } catch (ex) { + updateMainAndFooter(ex.toString(), NO_TIMESTAMP, HIDE_FOOTER); + } +} + +function dumpGCLogAndCCLog(aVerbose) { + let dumper = Cc["@mozilla.org/memory-info-dumper;1"].getService( + Ci.nsIMemoryInfoDumper + ); + + let inProgress = updateMainAndFooter( + "Saving logs...", + NO_TIMESTAMP, + HIDE_FOOTER + ); + let section = appendElement(gMain, "div", "section"); + + function displayInfo(aGCLog, aCCLog, aIsParent) { + appendElementWithText(section, "div", "", "Saved GC log to " + aGCLog.path); + + let ccLogType = aVerbose ? "verbose" : "concise"; + appendElementWithText( + section, + "div", + "", + "Saved " + ccLogType + " CC log to " + aCCLog.path + ); + } + + dumper.dumpGCAndCCLogsToFile("", aVerbose, /* dumpChildProcesses = */ true, { + onDump: displayInfo, + onFinish() { + inProgress.remove(); + }, + }); +} + +/** + * Top-level function that does the work of generating the page from the memory + * reporters. + */ +function updateAboutMemoryFromReporters() { + updateMainAndFooter("Measuring...", NO_TIMESTAMP, HIDE_FOOTER); + + try { + gCurrentReports = []; + gCurrentHasMozMallocUsableSize = gMgr.hasMozMallocUsableSize; + gCurrentIsDiff = false; + gFilter = ""; + + // Record the reports from the live memory reporters then process them. + let handleReport = function( + aProcess, + aUnsafePath, + aKind, + aUnits, + aAmount, + aDescription + ) { + gCurrentReports.push({ + process: aProcess, + path: aUnsafePath, + kind: aKind, + units: aUnits, + amount: aAmount, + description: aDescription, + }); + }; + + let displayReports = function() { + updateTitleMainAndFooter( + "live measurement", + "", + NO_TIMESTAMP, + SHOW_FOOTER + ); + updateAboutMemoryFromCurrentData(); + }; + + gMgr.getReports( + handleReport, + null, + displayReports, + null, + gAnonymize.checked + ); + } catch (ex) { + handleException(ex); + } +} + +// Increment this if the JSON format changes. +// +let gCurrentFileFormatVersion = 1; + +/** + * Parse a string as JSON and extract the |memory_report| property if it has + * one, which indicates the string is from a crash dump. + * + * @param aStr + * The string. + * @return The extracted object. + */ +function parseAndUnwrapIfCrashDump(aStr) { + let obj = JSON.parse(aStr); + if (obj.memory_report !== undefined) { + // It looks like a crash dump. The memory reports should be in the + // |memory_report| property. + obj = obj.memory_report; + } + return obj; +} + +/** + * Populate about:memory using the data stored in gCurrentReports and + * gCurrentHasMozMallocUsableSize. + */ +function updateAboutMemoryFromCurrentData() { + function processCurrentMemoryReports(aHandleReport, aDisplayReports) { + for (let r of gCurrentReports) { + aHandleReport( + r.process, + r.path, + r.kind, + r.units, + r.amount, + r.description, + r._presence + ); + } + aDisplayReports(); + } + + gIsDiff = gCurrentIsDiff; + appendAboutMemoryMain( + processCurrentMemoryReports, + gFilter, + gCurrentHasMozMallocUsableSize + ); + gIsDiff = false; +} + +/** + * Populate about:memory using the data in the given JSON object. + * + * @param aObj + * An object that (hopefully!) conforms to the JSON schema used by + * nsIMemoryInfoDumper. + */ +function updateAboutMemoryFromJSONObject(aObj) { + try { + assertInput( + aObj.version === gCurrentFileFormatVersion, + "data version number missing or doesn't match" + ); + assertInput( + aObj.hasMozMallocUsableSize !== undefined, + "missing 'hasMozMallocUsableSize' property" + ); + assertInput( + aObj.reports && aObj.reports instanceof Array, + "missing or non-array 'reports' property" + ); + + gCurrentReports = aObj.reports.concat(); + gCurrentHasMozMallocUsableSize = aObj.hasMozMallocUsableSize; + gCurrentIsDiff = gIsDiff; + gFilter = ""; + + updateAboutMemoryFromCurrentData(); + } catch (ex) { + handleException(ex); + } +} + +/** + * Populate about:memory using the data in the given JSON string. + * + * @param aStr + * A string containing JSON data conforming to the schema used by + * nsIMemoryReporterManager::dumpReports. + */ +function updateAboutMemoryFromJSONString(aStr) { + try { + let obj = parseAndUnwrapIfCrashDump(aStr); + updateAboutMemoryFromJSONObject(obj); + } catch (ex) { + handleException(ex); + } +} + +/** + * Loads the contents of a file into a string and passes that to a callback. + * + * @param aFilename + * The name of the file being read from. + * @param aTitleNote + * A description to put in the page title upon completion. + * @param aFn + * The function to call and pass the read string to upon completion. + */ +function loadMemoryReportsFromFile(aFilename, aTitleNote, aFn) { + updateMainAndFooter("Loading...", NO_TIMESTAMP, HIDE_FOOTER); + + try { + let reader = new FileReader(); + reader.onerror = () => { + throw new Error("FileReader.onerror"); + }; + reader.onabort = () => { + throw new Error("FileReader.onabort"); + }; + reader.onload = aEvent => { + // Clear "Loading..." from above. + updateTitleMainAndFooter(aTitleNote, "", NO_TIMESTAMP, SHOW_FOOTER); + aFn(aEvent.target.result); + }; + + // If it doesn't have a .gz suffix, read it as a (legacy) ungzipped file. + if (!aFilename.endsWith(".gz")) { + File.createFromFileName(aFilename).then(file => { + reader.readAsText(file); + }); + return; + } + + // Read compressed gzip file. + let converter = new nsGzipConverter(); + converter.asyncConvertData( + "gzip", + "uncompressed", + { + data: [], + onStartRequest(aR, aC) {}, + onDataAvailable(aR, aStream, aO, aCount) { + let bi = new nsBinaryStream(aStream); + this.data.push(bi.readBytes(aCount)); + }, + onStopRequest(aR, aC, aStatusCode) { + try { + if (!Components.isSuccessCode(aStatusCode)) { + throw new Components.Exception( + "Error while reading gzip file", + aStatusCode + ); + } + reader.readAsText(new Blob(this.data)); + } catch (ex) { + handleException(ex); + } + }, + }, + null + ); + + let file = new nsFile(aFilename); + let fileChan = NetUtil.newChannel({ + uri: Services.io.newFileURI(file), + loadUsingSystemPrincipal: true, + }); + fileChan.asyncOpen(converter); + } catch (ex) { + handleException(ex); + } +} + +/** + * Like updateAboutMemoryFromReporters(), but gets its data from a file instead + * of the memory reporters. + * + * @param aFilename + * The name of the file being read from. The expected format of the + * file's contents is described in a comment in nsIMemoryInfoDumper.idl. + */ +function updateAboutMemoryFromFile(aFilename) { + loadMemoryReportsFromFile( + aFilename, + /* title note */ aFilename, + updateAboutMemoryFromJSONString + ); +} + +/** + * Like updateAboutMemoryFromFile(), but gets its data from a two files and + * diffs them. + * + * @param aFilename1 + * The name of the first file being read from. + * @param aFilename2 + * The name of the first file being read from. + */ +function updateAboutMemoryFromTwoFiles(aFilename1, aFilename2) { + let titleNote = `diff of ${aFilename1} and ${aFilename2}`; + loadMemoryReportsFromFile(aFilename1, titleNote, function(aStr1) { + loadMemoryReportsFromFile(aFilename2, titleNote, function(aStr2) { + try { + let obj1 = parseAndUnwrapIfCrashDump(aStr1); + let obj2 = parseAndUnwrapIfCrashDump(aStr2); + gIsDiff = true; + updateAboutMemoryFromJSONObject(diffJSONObjects(obj1, obj2)); + gIsDiff = false; + } catch (ex) { + handleException(ex); + } + }); + }); +} + +// --------------------------------------------------------------------------- + +// Something unlikely to appear in a process name. +let kProcessPathSep = "^:^:^"; + +// Short for "diff report". +function DReport(aKind, aUnits, aAmount, aDescription, aNMerged, aPresence) { + this._kind = aKind; + this._units = aUnits; + this._amount = aAmount; + this._description = aDescription; + this._nMerged = aNMerged; + if (aPresence !== undefined) { + this._presence = aPresence; + } +} + +DReport.prototype = { + assertCompatible(aKind, aUnits) { + assert(this._kind == aKind, "Mismatched kinds"); + assert(this._units == aUnits, "Mismatched units"); + + // We don't check that the "description" properties match. This is because + // on Linux we can get cases where the paths are the same but the + // descriptions differ, like this: + // + // "path": "size/other-files/icon-theme.cache/[r--p]", + // "description": "/usr/share/icons/gnome/icon-theme.cache (read-only, not executable, private)" + // + // "path": "size/other-files/icon-theme.cache/[r--p]" + // "description": "/usr/share/icons/hicolor/icon-theme.cache (read-only, not executable, private)" + // + // In those cases, we just use the description from the first-encountered + // one, which is what about:memory also does. + // (Note: reports with those paths are no longer generated, but allowing + // the descriptions to differ seems reasonable.) + }, + + merge(aJr) { + this.assertCompatible(aJr.kind, aJr.units); + this._amount += aJr.amount; + this._nMerged++; + }, + + toJSON(aProcess, aPath, aAmount) { + return { + process: aProcess, + path: aPath, + kind: this._kind, + units: this._units, + amount: aAmount, + description: this._description, + _presence: this._presence, + }; + }, +}; + +// Constants that indicate if a DReport was present only in one of the data +// sets, or had to be added for balance. +DReport.PRESENT_IN_FIRST_ONLY = 1; +DReport.PRESENT_IN_SECOND_ONLY = 2; +DReport.ADDED_FOR_BALANCE = 3; + +/** + * Return true if the report contains a webIsolated process, + * which is a good indication that Fission is enabled. + */ +function hasWebIsolatedProcess(aJSONReports) { + for (let jr of aJSONReports) { + assert(jr.process !== undefined, "Missing process"); + if (jr.process.startsWith("webIsolated")) { + return true; + } + } + return false; +} + +/** + * Make a report map, which has combined path+process strings for keys, and + * DReport objects for values. + * + * @param aJSONReports + * The |reports| field of a JSON object. + * @param aForgetIsolation + If this is true, treat webIsolated processes like web processes. + * @return The constructed report map. + */ +function makeDReportMap(aJSONReports, aForgetIsolation) { + let dreportMap = {}; + for (let jr of aJSONReports) { + assert(jr.process !== undefined, "Missing process"); + assert(jr.path !== undefined, "Missing path"); + assert(jr.kind !== undefined, "Missing kind"); + assert(jr.units !== undefined, "Missing units"); + assert(jr.amount !== undefined, "Missing amount"); + assert(jr.description !== undefined, "Missing description"); + + // Strip out some non-deterministic stuff that prevents clean diffs. + // Ideally the memory reports themselves would contain information about + // which parts of the the process and path need to be stripped -- saving us + // from hardwiring knowledge of specific reporters here -- but we have no + // mechanism for that. (Any future redesign of how memory reporters work + // should include such a mechanism.) + + // Strip PIDs: + // - pid 123 + // - pid=123 + let pidRegex = /pid([ =])\d+/g; + let pidSubst = "pid$1NNN"; + let process = jr.process.replace(pidRegex, pidSubst); + let path = jr.path.replace(pidRegex, pidSubst); + + if (aForgetIsolation && process.startsWith("webIsolated")) { + process = "web (pid NNN)"; + } + + // Strip TIDs and threadpool IDs. + path = path.replace(/\(tid=(\d+)\)/, "(tid=NNN)"); + path = path.replace(/#\d+ \(tid=NNN\)/, "#N (tid=NNN)"); + + // Strip addresses: + // - .../js-zone(0x12345678)/... + // - .../zone(0x12345678)/... + // - .../worker(<URL>, 0x12345678)/... + path = path.replace(/zone\(0x[0-9A-Fa-f]+\)\//, "zone(0xNNN)/"); + path = path.replace( + /\/worker\((.+), 0x[0-9A-Fa-f]+\)\//, + "/worker($1, 0xNNN)/" + ); + + // Strip top window IDs: + // - explicit/window-objects/top(<URL>, id=123)/... + // - event-counts/window-objects/top(<URL>, id=123)/... + path = path.replace( + /^((?:explicit|event-counts)\/window-objects\/top\(.*, id=)\d+\)/, + "$1NNN)" + ); + + // Strip null principal UUIDs (but not other UUIDs, because they may be + // deterministic, such as those used by add-ons). + path = path.replace( + /moz-nullprincipal:{........-....-....-....-............}/g, + "moz-nullprincipal:{NNNNNNNN-NNNN-NNNN-NNNN-NNNNNNNNNNNN}" + ); + + // Strip segment counts from address-space. + if (path.startsWith("address-space")) { + path = path.replace(/\(segments=\d+\)/g, "(segments=NNNN)"); + } + + // Normalize omni.ja! paths. + path = path.replace( + /jar:file:\\\\\\(.+)\\omni.ja!/, + "jar:file:\\\\\\...\\omni.ja!" + ); + + // Normalize script source counts. + path = path.replace(/source\(scripts=(\d+), /, "source(scripts=NNN, "); + + let processPath = process + kProcessPathSep + path; + let rOld = dreportMap[processPath]; + if (rOld === undefined) { + dreportMap[processPath] = new DReport( + jr.kind, + jr.units, + jr.amount, + jr.description, + 1, + undefined + ); + } else { + rOld.merge(jr); + } + } + return dreportMap; +} + +// Return a new dreportMap which is the diff of two dreportMaps. Empties +// aDReportMap2 along the way. +function diffDReportMaps(aDReportMap1, aDReportMap2) { + let result = {}; + + for (let processPath in aDReportMap1) { + let r1 = aDReportMap1[processPath]; + let r2 = aDReportMap2[processPath]; + let r2_amount, r2_nMerged; + let presence; + if (r2 !== undefined) { + r1.assertCompatible(r2._kind, r2._units); + r2_amount = r2._amount; + r2_nMerged = r2._nMerged; + delete aDReportMap2[processPath]; + presence = undefined; // represents that it's present in both + } else { + r2_amount = 0; + r2_nMerged = 0; + presence = DReport.PRESENT_IN_FIRST_ONLY; + } + result[processPath] = new DReport( + r1._kind, + r1._units, + r2_amount - r1._amount, + r1._description, + Math.max(r1._nMerged, r2_nMerged), + presence + ); + } + + for (let processPath in aDReportMap2) { + let r2 = aDReportMap2[processPath]; + result[processPath] = new DReport( + r2._kind, + r2._units, + r2._amount, + r2._description, + r2._nMerged, + DReport.PRESENT_IN_SECOND_ONLY + ); + } + + return result; +} + +function makeJSONReports(aDReportMap) { + let reports = []; + for (let processPath in aDReportMap) { + let r = aDReportMap[processPath]; + if (r._amount !== 0) { + // If _nMerged > 1, we give the full (aggregated) amount in the first + // copy, and then use amount=0 in the remainder. When viewed in + // about:memory, this shows up as an entry with a "[2]"-style suffix + // and the correct amount. + let split = processPath.split(kProcessPathSep); + assert(split.length >= 2); + let process = split.shift(); + let path = split.join(); + reports.push(r.toJSON(process, path, r._amount)); + for (let i = 1; i < r._nMerged; i++) { + reports.push(r.toJSON(process, path, 0)); + } + } + } + + return reports; +} + +// Diff two JSON objects holding memory reports. +function diffJSONObjects(aJson1, aJson2) { + function simpleProp(aProp) { + assert( + aJson1[aProp] !== undefined && aJson1[aProp] === aJson2[aProp], + aProp + " properties don't match" + ); + return aJson1[aProp]; + } + + // If one report we're diffing contains webIsolated processes, but the other + // does not, then we're probably comparing a report with Fission enabled with + // one where it is not enabled. In this case, we want to make all of the + // webIsolated processes look like plain old web processes to get a better + // diff. + let hasIsolated1 = hasWebIsolatedProcess(aJson1.reports); + let hasIsolated2 = hasWebIsolatedProcess(aJson2.reports); + let eitherIsolated = hasIsolated1 || hasIsolated2; + let forgetIsolation = hasIsolated1 != hasIsolated2 && eitherIsolated; + + return { + version: simpleProp("version"), + + hasMozMallocUsableSize: simpleProp("hasMozMallocUsableSize"), + + reports: makeJSONReports( + diffDReportMaps( + makeDReportMap(aJson1.reports, forgetIsolation), + makeDReportMap(aJson2.reports, forgetIsolation) + ) + ), + }; +} + +// --------------------------------------------------------------------------- + +// |PColl| is short for "process collection". +function PColl() { + this._trees = {}; + this._degenerates = {}; + this._heapTotal = 0; +} + +/** + * Processes reports (whether from reporters or from a file) and append the + * main part of the page. + * + * @param aProcessReports + * Function that extracts the memory reports from the reporters or from + * file. + * @param aFilter + * String or RegExp used to filter reports by their path. + * @param aHasMozMallocUsableSize + * Boolean indicating if moz_malloc_usable_size works. + */ +function appendAboutMemoryMain( + aProcessReports, + aFilter, + aHasMozMallocUsableSize +) { + let pcollsByProcess = {}; + let infoByProcess = {}; + + function handleReport( + aProcess, + aUnsafePath, + aKind, + aUnits, + aAmount, + aDescription, + aPresence + ) { + if (aUnsafePath.startsWith("explicit/")) { + assertInput( + aKind === KIND_HEAP || aKind === KIND_NONHEAP, + "bad explicit kind" + ); + assertInput(aUnits === UNITS_BYTES, "bad explicit units"); + } + + assert( + aPresence === undefined || + aPresence == DReport.PRESENT_IN_FIRST_ONLY || + aPresence == DReport.PRESENT_IN_SECOND_ONLY, + "bad presence" + ); + + // If the process is empty, that means this process -- which is the main + // process, because this is chrome JS code -- is doing the dumping. + // Generate the process identifier: `Main Process (pid $PID)`. + // + // Note that `HandleReportAndFinishReportingCallbacks::Callback()` handles + // this when saving memory reports to file. So, if we are loading memory + // reports from file then `aProcess` will already be non-empty. + let process = aProcess + ? aProcess + : gMainProcessPrefix + " (pid " + Services.appinfo.processID + ")"; + + // Store the "resident" value for each process, so that if we filter it + // out, we can still use it to correctly sort processes and generate the + // process index. + let info = infoByProcess[process]; + if (!info) { + info = infoByProcess[process] = {}; + } + if (aUnsafePath == "resident") { + infoByProcess[process].resident = aAmount; + } + + // Ignore reports that don't match the current filter. + if (!stringMatchesFilter(aUnsafePath, aFilter)) { + return; + } + + let unsafeNames = aUnsafePath.split("/"); + let unsafeName0 = unsafeNames[0]; + let isDegenerate = unsafeNames.length === 1; + + // Get the PColl table for the process, creating it if necessary. + let pcoll = pcollsByProcess[process]; + if (!pcollsByProcess[process]) { + pcoll = pcollsByProcess[process] = new PColl(); + } + + // Get the root node, creating it if necessary. + let psubcoll = isDegenerate ? pcoll._degenerates : pcoll._trees; + let t = psubcoll[unsafeName0]; + if (!t) { + t = psubcoll[unsafeName0] = new TreeNode( + unsafeName0, + aUnits, + isDegenerate + ); + } + + if (!isDegenerate) { + // Add any missing nodes in the tree implied by aUnsafePath, and fill in + // the properties that we can with a top-down traversal. + for (let i = 1; i < unsafeNames.length; i++) { + let unsafeName = unsafeNames[i]; + let u = t.findKid(unsafeName); + if (!u) { + u = new TreeNode(unsafeName, aUnits, isDegenerate); + if (!t._kids) { + t._kids = []; + } + t._kids.push(u); + } + t = u; + } + + // Update the heap total if necessary. + if (unsafeName0 === "explicit" && aKind == KIND_HEAP) { + pcollsByProcess[process]._heapTotal += aAmount; + } + } + + if (t._amount) { + // Duplicate! Sum the values and mark it as a dup. + t._amount += aAmount; + t._nMerged = t._nMerged ? t._nMerged + 1 : 2; + assert(t._presence === aPresence, "presence mismatch"); + } else { + // New leaf node. Fill in extra node details from the report. + t._amount = aAmount; + t._description = aDescription; + if (aPresence !== undefined) { + t._presence = aPresence; + } + } + } + + function displayReports() { + // Sort the processes. + let processes = Object.keys(infoByProcess); + processes.sort(function(aProcessA, aProcessB) { + assert( + aProcessA != aProcessB, + `Elements of Object.keys() should be unique, but ` + + `saw duplicate '${aProcessA}' elem.` + ); + + // Always put the main process first. + if (aProcessA.startsWith(gMainProcessPrefix)) { + return -1; + } + if (aProcessB.startsWith(gMainProcessPrefix)) { + return 1; + } + + // Then sort by resident size. + let residentA = infoByProcess[aProcessA].resident || -1; + let residentB = infoByProcess[aProcessB].resident || -1; + if (residentA > residentB) { + return -1; + } + if (residentA < residentB) { + return 1; + } + + // Then sort by process name. + if (aProcessA < aProcessB) { + return -1; + } + if (aProcessA > aProcessB) { + return 1; + } + + return 0; + }); + + // We set up this general layout inside gMain: + // + // <div class="outputContainer"> + // <div class="sections"></div> + // <div class="sidebar"> + // <div class="sidebarContents"> + // <div class="sidebarItem filterItem"></div> + // <div class="sidebarItem indexItem"></div> + // </div> + // </div> + // </div> + // + // If we detect that outputContainer already exists, then this is an update + // (due to typing in a filter string) to an already-displayed memory report. + // In this case we preserve the structure of the layout and only replace + // div.sections and #indexItem. Preserving the filter sidebar item means we + // preserve any editing state in its <input>. + + // Generate the main process sections. + let sections = newElement("div", "sections"); + sections.setAttribute("role", "main"); + + for (let [i, process] of processes.entries()) { + let pcolls = pcollsByProcess[process]; + if (!pcolls) { + continue; + } + + let section = appendElement(sections, "div", "section"); + appendProcessAboutMemoryElements( + section, + i, + process, + pcolls._trees, + pcolls._degenerates, + pcolls._heapTotal, + aHasMozMallocUsableSize, + aFilter != "" + ); + } + + if (!sections.firstChild) { + appendElementWithText(sections, "div", "section", "No results found."); + } + + // Generate the process index. + let indexItem = newElement("div", "sidebarItem"); + indexItem.classList.add("indexItem"); + appendElementWithText(indexItem, "div", "sidebarLabel", "Process index"); + let indexList = appendElement(indexItem, "ul", "index"); + + for (let [i, process] of processes.entries()) { + let indexListItem = appendElement(indexList, "li"); + let pcolls = pcollsByProcess[process]; + if (pcolls) { + let indexLink = appendElementWithText(indexListItem, "a", "", process); + indexLink.href = "#start" + i; + } else { + // We've filtered out all reports from this process. Generate a non-link + // entry in the process index, and skip creating a process report + // section. + indexListItem.textContent = process; + } + } + + // If we are updating, just swap in the new process output. + let outputContainer = gMain.querySelector(".outputContainer"); + if (outputContainer) { + outputContainer.querySelector(".sections").replaceWith(sections); + outputContainer.querySelector(".indexItem").replaceWith(indexItem); + return; + } + + // Otherwise, generate the rest of the layout. + outputContainer = appendElement(gMain, "div", "outputContainer"); + outputContainer.appendChild(sections); + + let sidebar = appendElement(outputContainer, "div", "sidebar"); + sidebar.setAttribute("role", "navigation"); + let sidebarContents = appendElement(sidebar, "div", "sidebarContents"); + + // Generate the filter input and checkbox. + let filterItem = appendElement(sidebarContents, "div", "sidebarItem"); + filterItem.classList.add("filterItem"); + appendElementWithText(filterItem, "div", "sidebarLabel", "Filter"); + + let filterInput = appendElement(filterItem, "input", "filterInput"); + filterInput.placeholder = "Memory report path filter"; + + let filterOptions = appendElement(filterItem, "div"); + let filterRegExLabel = appendElement(filterOptions, "label"); + let filterRegExCheckbox = appendElement(filterRegExLabel, "input"); + filterRegExCheckbox.type = "checkbox"; + filterRegExLabel.append(" Regular expression"); + + // Set up event handlers to update the display if the filter input or + // checkbox changes. + let filterUpdateTimeout; + let filterUpdate = function() { + if (filterUpdateTimeout) { + window.clearTimeout(filterUpdateTimeout); + } + filterUpdateTimeout = window.setTimeout(function() { + try { + gFilter = + filterRegExCheckbox.checked && filterInput.value != "" + ? new RegExp(filterInput.value) + : filterInput.value; + } catch (ex) { + // Match nothing if the regex was invalid. + gFilter = new RegExp("^$"); + } + updateAboutMemoryFromCurrentData(); + }, gFilterUpdateDelayMS); + }; + filterInput.oninput = filterUpdate; + filterRegExCheckbox.onchange = filterUpdate; + + // Append the process list item after the filter item. + sidebarContents.appendChild(indexItem); + } + + aProcessReports(handleReport, displayReports); +} + +// --------------------------------------------------------------------------- + +// There are two kinds of TreeNode. +// - Leaf TreeNodes correspond to reports. +// - Non-leaf TreeNodes are just scaffolding nodes for the tree; their values +// are derived from their children. +// Some trees are "degenerate", i.e. they contain a single node, i.e. they +// correspond to a report whose path has no '/' separators. +function TreeNode(aUnsafeName, aUnits, aIsDegenerate) { + this._units = aUnits; + this._unsafeName = aUnsafeName; + if (aIsDegenerate) { + this._isDegenerate = true; + } + + // Leaf TreeNodes have these properties added immediately after construction: + // - _amount + // - _description + // - _nMerged (only defined if > 1) + // - _presence (only defined if value is PRESENT_IN_{FIRST,SECOND}_ONLY) + // + // Non-leaf TreeNodes have these properties added later: + // - _kids + // - _amount + // - _description + // - _hideKids (only defined if true) + // - _maxAbsDescendant (on-demand, only when gIsDiff is set) +} + +TreeNode.prototype = { + findKid(aUnsafeName) { + if (this._kids) { + for (let kid of this._kids) { + if (kid._unsafeName === aUnsafeName) { + return kid; + } + } + } + return undefined; + }, + + // When gIsDiff is false, tree operations -- sorting and determining if a + // sub-tree is significant -- are straightforward. But when gIsDiff is true, + // the combination of positive and negative values within a tree complicates + // things. So for a non-leaf node, instead of just looking at _amount, we + // instead look at the maximum absolute value of the node and all of its + // descendants. + maxAbsDescendant() { + if (!this._kids) { + // No kids? Just return the absolute value of the amount. + return Math.abs(this._amount); + } + + if ("_maxAbsDescendant" in this) { + // We've computed this before? Return the saved value. + return this._maxAbsDescendant; + } + + // Compute the maximum absolute value of all descendants. + let max = Math.abs(this._amount); + for (let kid of this._kids) { + max = Math.max(max, kid.maxAbsDescendant()); + } + this._maxAbsDescendant = max; + return max; + }, + + toString() { + switch (this._units) { + case UNITS_BYTES: + return formatBytes(this._amount); + case UNITS_COUNT: + case UNITS_COUNT_CUMULATIVE: + return formatNum(this._amount); + case UNITS_PERCENTAGE: + return formatPercentage(this._amount); + default: + throw new Error( + "Invalid memory report(s): bad units in TreeNode.toString" + ); + } + }, +}; + +// Sort TreeNodes first by size, then by name. The latter is important for the +// about:memory tests, which need a predictable ordering of reporters which +// have the same amount. +TreeNode.compareAmounts = function(aA, aB) { + let a, b; + if (gIsDiff) { + a = aA.maxAbsDescendant(); + b = aB.maxAbsDescendant(); + } else { + a = aA._amount; + b = aB._amount; + } + if (a > b) { + return -1; + } + if (a < b) { + return 1; + } + return TreeNode.compareUnsafeNames(aA, aB); +}; + +TreeNode.compareUnsafeNames = function(aA, aB) { + return aA._unsafeName.localeCompare(aB._unsafeName); +}; + +/** + * Fill in the remaining properties for the specified tree in a bottom-up + * fashion. + * + * @param aRoot + * The tree root. + */ +function fillInTree(aRoot) { + // Fill in the remaining properties bottom-up. + function fillInNonLeafNodes(aT) { + if (!aT._kids) { + // Leaf node. Has already been filled in. + } else if (aT._kids.length === 1 && aT != aRoot) { + // Non-root, non-leaf node with one child. Merge the child with the node + // to avoid redundant entries. + let kid = aT._kids[0]; + let kidBytes = fillInNonLeafNodes(kid); + aT._unsafeName += "/" + kid._unsafeName; + if (kid._kids) { + aT._kids = kid._kids; + } else { + delete aT._kids; + } + aT._amount = kidBytes; + aT._description = kid._description; + if (kid._nMerged !== undefined) { + aT._nMerged = kid._nMerged; + } + assert(!aT._hideKids && !kid._hideKids, "_hideKids set when merging"); + } else { + // Non-leaf node with multiple children. Derive its _amount and + // _description entirely from its children... + let kidsBytes = 0; + for (let kid of aT._kids) { + kidsBytes += fillInNonLeafNodes(kid); + } + + // ... except in one special case. When diffing two memory report sets, + // if one set has a node with children and the other has the same node + // but without children -- e.g. the first has "a/b/c" and "a/b/d", but + // the second only has "a/b" -- we need to add a fake node "a/b/(fake)" + // to the second to make the trees comparable. It's ugly, but it works. + if ( + aT._amount !== undefined && + (aT._presence === DReport.PRESENT_IN_FIRST_ONLY || + aT._presence === DReport.PRESENT_IN_SECOND_ONLY) + ) { + aT._amount += kidsBytes; + let fake = new TreeNode("(fake child)", aT._units); + fake._presence = DReport.ADDED_FOR_BALANCE; + fake._amount = aT._amount - kidsBytes; + aT._kids.push(fake); + delete aT._presence; + } else { + assert( + aT._amount === undefined, + "_amount already set for non-leaf node" + ); + aT._amount = kidsBytes; + } + aT._description = "The sum of all entries below this one."; + } + return aT._amount; + } + + // cannotMerge is set because don't want to merge into a tree's root node. + fillInNonLeafNodes(aRoot); +} + +/** + * Compute the "heap-unclassified" value and insert it into the "explicit" + * tree. + * + * @param aT + * The "explicit" tree. + * @param aHeapAllocatedNode + * The "heap-allocated" tree node. + * @param aHeapTotal + * The sum of all explicit HEAP reports for this process. + * @return A boolean indicating if "heap-allocated" is known for the process. + */ +function addHeapUnclassifiedNode(aT, aHeapAllocatedNode, aHeapTotal) { + if (aHeapAllocatedNode === undefined) { + return false; + } + + if (aT.findKid("heap-unclassified")) { + // heap-unclassified was already calculated, there's nothing left to do. + // This can happen when memory reports are exported from areweslimyet.com. + return true; + } + + assert(aHeapAllocatedNode._isDegenerate, "heap-allocated is not degenerate"); + let heapAllocatedBytes = aHeapAllocatedNode._amount; + let heapUnclassifiedT = new TreeNode("heap-unclassified", UNITS_BYTES); + heapUnclassifiedT._amount = heapAllocatedBytes - aHeapTotal; + heapUnclassifiedT._description = + "Memory not classified by a more specific report. This includes " + + "slop bytes due to internal fragmentation in the heap allocator " + + "(caused when the allocator rounds up request sizes)."; + aT._kids.push(heapUnclassifiedT); + aT._amount += heapUnclassifiedT._amount; + return true; +} + +/** + * Sort all kid nodes from largest to smallest, and insert aggregate nodes + * where appropriate. + * + * @param aTotalBytes + * The size of the tree's root node. + * @param aT + * The tree. + */ +function sortTreeAndInsertAggregateNodes(aTotalBytes, aT) { + const kSignificanceThresholdPerc = 1; + + function isInsignificant(aT) { + if (gVerbose.checked) { + return false; + } + + let perc = gIsDiff + ? (100 * aT.maxAbsDescendant()) / Math.abs(aTotalBytes) + : (100 * aT._amount) / aTotalBytes; + return perc < kSignificanceThresholdPerc; + } + + if (!aT._kids) { + return; + } + + aT._kids.sort(TreeNode.compareAmounts); + + // If the first child is insignificant, they all are, and there's no point + // creating an aggregate node that lacks siblings. Just set the parent's + // _hideKids property and process all children. + if (isInsignificant(aT._kids[0])) { + aT._hideKids = true; + for (let kid of aT._kids) { + sortTreeAndInsertAggregateNodes(aTotalBytes, kid); + } + return; + } + + // Look at all children except the last one. + let i; + for (i = 0; i < aT._kids.length - 1; i++) { + if (isInsignificant(aT._kids[i])) { + // This child is below the significance threshold. If there are other + // (smaller) children remaining, move them under an aggregate node. + let i0 = i; + let nAgg = aT._kids.length - i0; + // Create an aggregate node. Inherit units from the parent; everything + // in the tree should have the same units anyway (we test this later). + let aggT = new TreeNode(`(${nAgg} tiny)`, aT._units); + aggT._kids = []; + let aggBytes = 0; + for (; i < aT._kids.length; i++) { + aggBytes += aT._kids[i]._amount; + aggT._kids.push(aT._kids[i]); + } + aggT._hideKids = true; + aggT._amount = aggBytes; + aggT._description = + nAgg + + " sub-trees that are below the " + + kSignificanceThresholdPerc + + "% significance threshold."; + aT._kids.splice(i0, nAgg, aggT); + aT._kids.sort(TreeNode.compareAmounts); + + // Process the moved children. + for (let kid of aggT._kids) { + sortTreeAndInsertAggregateNodes(aTotalBytes, kid); + } + return; + } + + sortTreeAndInsertAggregateNodes(aTotalBytes, aT._kids[i]); + } + + // The first n-1 children were significant. Don't consider if the last child + // is significant; there's no point creating an aggregate node that only has + // one child. Just process it. + sortTreeAndInsertAggregateNodes(aTotalBytes, aT._kids[i]); +} + +// Global variable indicating if we've seen any invalid values for this +// process; it holds the unsafePaths of any such reports. It is reset for +// each new process. +let gUnsafePathsWithInvalidValuesForThisProcess = []; + +function appendWarningElements( + aP, + aHasKnownHeapAllocated, + aHasMozMallocUsableSize, + aFiltered +) { + // These warnings may not make sense if the reporters they reference have been + // filtered out, so just skip them if we have a filter applied. + if (!aFiltered && !aHasKnownHeapAllocated && !aHasMozMallocUsableSize) { + appendElementWithText( + aP, + "p", + "", + "WARNING: the 'heap-allocated' memory reporter and the " + + "moz_malloc_usable_size() function do not work for this platform " + + "and/or configuration. This means that 'heap-unclassified' is not " + + "shown and the 'explicit' tree shows much less memory than it should.\n\n" + ); + } else if (!aFiltered && !aHasKnownHeapAllocated) { + appendElementWithText( + aP, + "p", + "", + "WARNING: the 'heap-allocated' memory reporter does not work for this " + + "platform and/or configuration. This means that 'heap-unclassified' " + + "is not shown and the 'explicit' tree shows less memory than it should.\n\n" + ); + } else if (!aFiltered && !aHasMozMallocUsableSize) { + appendElementWithText( + aP, + "p", + "", + "WARNING: the moz_malloc_usable_size() function does not work for " + + "this platform and/or configuration. This means that much of the " + + "heap-allocated memory is not measured by individual memory reporters " + + "and so will fall under 'heap-unclassified'.\n\n" + ); + } + + if (gUnsafePathsWithInvalidValuesForThisProcess.length) { + let div = appendElement(aP, "div"); + appendElementWithText( + div, + "p", + "", + "WARNING: the following values are negative or unreasonably large.\n" + ); + + let ul = appendElement(div, "ul"); + for ( + let i = 0; + i < gUnsafePathsWithInvalidValuesForThisProcess.length; + i++ + ) { + appendTextNode(ul, " "); + appendElementWithText( + ul, + "li", + "", + flipBackslashes(gUnsafePathsWithInvalidValuesForThisProcess[i]) + "\n" + ); + } + + appendElementWithText( + div, + "p", + "", + "This indicates a defect in one or more memory reporters. The " + + "invalid values are highlighted.\n\n" + ); + gUnsafePathsWithInvalidValuesForThisProcess = []; // reset for the next process + } +} + +/** + * Appends the about:memory elements for a single process. + * + * @param aP + * The parent DOM node. + * @param aN + * The number of the process, starting at 0. + * @param aProcess + * The name of the process. + * @param aTrees + * The table of non-degenerate trees for this process. + * @param aDegenerates + * The table of degenerate trees for this process. + * @param aHasMozMallocUsableSize + * Boolean indicating if moz_malloc_usable_size works. + * @param aFiltered + * Boolean indicating whether the reports were filtered. + * @return The generated text. + */ +function appendProcessAboutMemoryElements( + aP, + aN, + aProcess, + aTrees, + aDegenerates, + aHeapTotal, + aHasMozMallocUsableSize, + aFiltered +) { + let appendLink = function(aHere, aThere, aArrow) { + let link = appendElementWithText(aP, "a", "upDownArrow", aArrow); + link.href = "#" + aThere + aN; + link.id = aHere + aN; + link.title = `Go to the ${aThere} of ${aProcess}`; + link.style = "text-decoration: none"; + + // This gives nice spacing when we copy and paste. + appendElementWithText(aP, "span", "", "\n"); + }; + + appendElementWithText(aP, "h1", "", aProcess); + appendLink("start", "end", "↓"); + + // We'll fill this in later. + let warningsDiv = appendElement(aP, "div", "accuracyWarning"); + + // The explicit tree. + let hasExplicitTree; + let hasKnownHeapAllocated; + { + let treeName = "explicit"; + let t = aTrees[treeName]; + if (t) { + let pre = appendSectionHeader(aP, "Explicit Allocations"); + hasExplicitTree = true; + fillInTree(t); + // Using the "heap-allocated" reporter here instead of + // nsMemoryReporterManager.heapAllocated goes against the usual pattern. + // But the "heap-allocated" node will go in the tree like the others, so + // we have to deal with it, and once we're dealing with it, it's easier + // to keep doing so rather than switching to the distinguished amount. + hasKnownHeapAllocated = + aDegenerates && + addHeapUnclassifiedNode(t, aDegenerates["heap-allocated"], aHeapTotal); + sortTreeAndInsertAggregateNodes(t._amount, t); + t._description = explicitTreeDescription; + appendTreeElements(pre, t, aProcess, ""); + delete aTrees[treeName]; + } + appendTextNode(aP, "\n"); // gives nice spacing when we copy and paste + } + + // Fill in and sort all the non-degenerate other trees. + let otherTrees = []; + for (let unsafeName in aTrees) { + let t = aTrees[unsafeName]; + assert(!t._isDegenerate, "tree is degenerate"); + fillInTree(t); + sortTreeAndInsertAggregateNodes(t._amount, t); + otherTrees.push(t); + } + otherTrees.sort(TreeNode.compareUnsafeNames); + + // Get the length of the longest root value among the degenerate other trees, + // and sort them as well. + let otherDegenerates = []; + let maxStringLength = 0; + for (let unsafeName in aDegenerates) { + let t = aDegenerates[unsafeName]; + assert(t._isDegenerate, "tree is not degenerate"); + let length = t.toString().length; + if (length > maxStringLength) { + maxStringLength = length; + } + otherDegenerates.push(t); + } + otherDegenerates.sort(TreeNode.compareUnsafeNames); + + // Now generate the elements, putting non-degenerate trees first. + if (otherTrees.length || otherDegenerates.length) { + let pre = appendSectionHeader(aP, "Other Measurements"); + for (let t of otherTrees) { + appendTreeElements(pre, t, aProcess, ""); + appendTextNode(pre, "\n"); // blank lines after non-degenerate trees + } + for (let t of otherDegenerates) { + let padText = "".padStart(maxStringLength - t.toString().length, " "); + appendTreeElements(pre, t, aProcess, padText); + } + appendTextNode(aP, "\n"); // gives nice spacing when we copy and paste + } + + // Add any warnings about inaccuracies in the "explicit" tree due to platform + // limitations. These must be computed after generating all the text. The + // newlines give nice spacing if we copy+paste into a text buffer. + if (hasExplicitTree) { + appendWarningElements( + warningsDiv, + hasKnownHeapAllocated, + aHasMozMallocUsableSize, + aFiltered + ); + } + + appendElementWithText(aP, "h3", "", "End of " + aProcess); + appendLink("end", "start", "↑"); +} + +// The locale used when formatting a number as a human-readable string in any +// format. +const kStyleLocale = "en-US"; + +// Used for UNITS_BYTES values that are printed as MiB. +const kMBFormat = new Intl.NumberFormat(kStyleLocale, { + minimumFractionDigits: 2, + maximumFractionDigits: 2, +}); + +// Used for UNITS_PERCENTAGE values. +const kPercFormatter = new Intl.NumberFormat(kStyleLocale, { + style: "percent", + minimumFractionDigits: 2, + maximumFractionDigits: 2, +}); + +// Used for fractions within the tree. +const kFracFormatter = new Intl.NumberFormat(kStyleLocale, { + style: "percent", + minimumIntegerDigits: 2, + minimumFractionDigits: 2, + maximumFractionDigits: 2, +}); + +// Used for special-casing 100% fractions within the tree. +const kFrac1Formatter = new Intl.NumberFormat(kStyleLocale, { + style: "percent", + minimumIntegerDigits: 3, + minimumFractionDigits: 1, + maximumFractionDigits: 1, +}); + +// Used when no custom formatting was requested. +const kDefaultNumFormatter = new Intl.NumberFormat(kStyleLocale); + +/** + * Formats an int as a human-readable string. + * + * @param aN + * The integer to format. + * @param aFormatter + * Optional formatter object. + * @return A human-readable string representing the int. + */ +function formatNum(aN, aFormatter) { + return (aFormatter || kDefaultNumFormatter).format(aN); +} + +/** + * Converts a byte count to an appropriate string representation. + * + * @param aBytes + * The byte count. + * @return The string representation. + */ +function formatBytes(aBytes) { + return gVerbose.checked + ? `${formatNum(aBytes)} B` + : `${formatNum(aBytes / (1024 * 1024), kMBFormat)} MB`; +} + +/** + * Converts a UNITS_PERCENTAGE value to an appropriate string representation. + * + * @param aPerc100x + * The percentage, multiplied by 100 (see nsIMemoryReporter). + * @return The string representation + */ +function formatPercentage(aPerc100x) { + // A percentage like 12.34% will have an aPerc100x value of 1234, and we need + // to divide that by 10,000 to get the 0.1234 that toLocaleString() wants. + return formatNum(aPerc100x / 10000, kPercFormatter); +} + +/* + * Converts a tree fraction to an appropriate string representation. + * + * @param aNum + * The numerator. + * @param aDenom + * The denominator. + * @return The string representation + */ +function formatTreeFrac(aNum, aDenom) { + // Two special behaviours here: + // - We treat 0 / 0 as 100%. + // - We want 4 digits, as much as possible, because it gives good vertical + // alignment. For positive numbers, 00.00%--99.99% works straighforwardly, + // but 100.0% needs special handling. + let num = aDenom === 0 ? 1 : aNum / aDenom; + return 0.99995 <= num && num <= 1 + ? formatNum(1, kFrac1Formatter) + : formatNum(num, kFracFormatter); +} + +const kNoKidsSep = " ── ", + kHideKidsSep = " ++ ", + kShowKidsSep = " -- "; + +function appendMrNameSpan( + aP, + aDescription, + aUnsafeName, + aIsInvalid, + aNMerged, + aPresence +) { + let safeName = flipBackslashes(aUnsafeName); + if (!aIsInvalid && !aNMerged && !aPresence) { + safeName += "\n"; + } + let nameSpan = appendElementWithText(aP, "span", "mrName", safeName); + nameSpan.title = aDescription; + + if (aIsInvalid) { + let noteText = " [?!]"; + if (!aNMerged) { + noteText += "\n"; + } + let noteSpan = appendElementWithText(aP, "span", "mrNote", noteText); + noteSpan.title = + "Warning: this value is invalid and indicates a bug in one or more " + + "memory reporters. "; + } + + if (aNMerged) { + let noteText = ` [${aNMerged}]`; + if (!aPresence) { + noteText += "\n"; + } + let noteSpan = appendElementWithText(aP, "span", "mrNote", noteText); + noteSpan.title = + "This value is the sum of " + + aNMerged + + " memory reports that all have the same path."; + } + + if (aPresence) { + let c, title; + switch (aPresence) { + case DReport.PRESENT_IN_FIRST_ONLY: + c = "-"; + title = + "This value was only present in the first set of memory reports."; + break; + case DReport.PRESENT_IN_SECOND_ONLY: + c = "+"; + title = + "This value was only present in the second set of memory reports."; + break; + case DReport.ADDED_FOR_BALANCE: + c = "!"; + title = + "One of the sets of memory reports lacked children for this " + + "node's parent. This is a fake child node added to make the " + + "two memory sets comparable."; + break; + default: + assert(false, "bad presence"); + break; + } + let noteSpan = appendElementWithText(aP, "span", "mrNote", ` [${c}]\n`); + noteSpan.title = title; + } +} + +// This is used to record the (safe) IDs of which sub-trees have been manually +// expanded (marked as true) and collapsed (marked as false). It's used to +// replicate the collapsed/expanded state when the page is updated. It can end +// up holding IDs of nodes that no longer exist, e.g. for compartments that +// have been closed. This doesn't seem like a big deal, because the number is +// limited by the number of entries the user has changed from their original +// state. +let gShowSubtreesBySafeTreeId = {}; + +function assertClassListContains(aElem, aClassName) { + assert(aElem, "undefined " + aClassName); + assert(aElem.classList.contains(aClassName), "classname isn't " + aClassName); +} + +function toggle(aEvent) { + // This relies on each line being a span that contains at least four spans: + // mrValue, mrPerc, mrSep, mrName, and then zero or more mrNotes. All + // whitespace must be within one of these spans for this function to find the + // right nodes. And the span containing the children of this line must + // immediately follow. Assertions check this. + + // We want the outer span. |aEvent.target| will normally be one of the inner + // spans. However, if the click was dispatched via a11y, it might be the outer + // span because some of the inner spans are pruned from the a11y tree. + let outerSpan = aEvent.target.classList.contains("hasKids") + ? aEvent.target + : aEvent.target.parentNode; + assertClassListContains(outerSpan, "hasKids"); + + // Toggle the '++'/'--' separator. + let isExpansion; + let sepSpan = outerSpan.childNodes[2]; + assertClassListContains(sepSpan, "mrSep"); + if (sepSpan.textContent === kHideKidsSep) { + isExpansion = true; + sepSpan.textContent = kShowKidsSep; + outerSpan.setAttribute("aria-expanded", "true"); + } else if (sepSpan.textContent === kShowKidsSep) { + isExpansion = false; + sepSpan.textContent = kHideKidsSep; + outerSpan.setAttribute("aria-expanded", "false"); + } else { + assert(false, "bad sepSpan textContent"); + } + + // Toggle visibility of the span containing this node's children. + let subTreeSpan = outerSpan.nextSibling; + assertClassListContains(subTreeSpan, "kids"); + subTreeSpan.classList.toggle("hidden"); + + // Record/unrecord that this sub-tree was toggled. + let safeTreeId = outerSpan.id; + if (gShowSubtreesBySafeTreeId[safeTreeId] !== undefined) { + delete gShowSubtreesBySafeTreeId[safeTreeId]; + } else { + gShowSubtreesBySafeTreeId[safeTreeId] = isExpansion; + } +} + +function expandPathToThisElement(aElement) { + if (aElement.classList.contains("kids")) { + // Unhide the kids. + aElement.classList.remove("hidden"); + expandPathToThisElement(aElement.previousSibling); // hasKids + } else if (aElement.classList.contains("hasKids")) { + // Change the separator to '--'. + let sepSpan = aElement.childNodes[2]; + assertClassListContains(sepSpan, "mrSep"); + sepSpan.textContent = kShowKidsSep; + aElement.setAttribute("aria-expanded", "true"); + expandPathToThisElement(aElement.parentNode.parentNode); // kids or pre.entries + } else { + assertClassListContains(aElement, "entries"); + } +} + +/** + * Appends the elements for the tree, including its heading. + * + * @param aP + * The parent DOM node. + * @param aRoot + * The tree root. + * @param aProcess + * The process the tree corresponds to. + * @param aPadText + * A string to pad the start of each entry. + */ +function appendTreeElements(aP, aRoot, aProcess, aPadText) { + /** + * Appends the elements for a particular tree, without a heading. There's a + * subset of the Unicode "light" box-drawing chars that is widely implemented + * in terminals, and this code sticks to that subset to maximize the chance + * that copying and pasting about:memory output to a terminal will work + * correctly. + * + * @param aP + * The parent DOM node. + * @param aProcess + * The process the tree corresponds to. + * @param aUnsafeNames + * An array of the names forming the path to aT. + * @param aRoot + * The root of the tree this sub-tree belongs to. + * @param aT + * The tree. + * @param aTlThis + * The treeline for this entry. + * @param aTlKids + * The treeline for this entry's children. + * @param aParentStringLength + * The length of the formatted byte count of the top node in the tree. + */ + function appendTreeElements2( + aP, + aProcess, + aUnsafeNames, + aRoot, + aT, + aTlThis, + aTlKids, + aParentStringLength + ) { + function appendN(aS, aC, aN) { + for (let i = 0; i < aN; i++) { + aS += aC; + } + return aS; + } + + // The entire entry including children needs to be treated as a list item + // for a11y purposes. + let p = document.createElement("span"); + p.setAttribute("role", "listitem"); + aP.appendChild(p); + + // The tree line. Indent more if this entry is narrower than its parent. + let valueText = aT.toString(); + let extraTlLength = Math.max(aParentStringLength - valueText.length, 0); + if (extraTlLength > 0) { + aTlThis = appendN(aTlThis, "─", extraTlLength); + aTlKids = appendN(aTlKids, " ", extraTlLength); + } + let treeLine = appendElementWithText(p, "span", "treeline", aTlThis); + treeLine.setAttribute("aria-hidden", "true"); + + // Detect and record invalid values. But not if gIsDiff is true, because + // we expect negative values in that case. + assertInput( + aRoot._units === aT._units, + "units within a tree are inconsistent" + ); + let tIsInvalid = false; + if (!gIsDiff && !(0 <= aT._amount && aT._amount <= aRoot._amount)) { + tIsInvalid = true; + let unsafePath = aUnsafeNames.join("/"); + gUnsafePathsWithInvalidValuesForThisProcess.push(unsafePath); + reportAssertionFailure( + `Invalid value (${aT._amount} / ${aRoot._amount}) for ` + + flipBackslashes(unsafePath) + ); + } + + // For non-leaf nodes, the entire sub-tree is put within a span so it can + // be collapsed if the node is clicked on. + let d; + let sep; + let showSubtrees; + if (aT._kids) { + // Determine if we should show the sub-tree below this entry; this + // involves reinstating any previous toggling of the sub-tree. + let unsafePath = aUnsafeNames.join("/"); + let safeTreeId = `${aProcess}:${flipBackslashes(unsafePath)}`; + showSubtrees = !aT._hideKids; + if (gShowSubtreesBySafeTreeId[safeTreeId] !== undefined) { + showSubtrees = gShowSubtreesBySafeTreeId[safeTreeId]; + } + d = appendElement(p, "span", "hasKids"); + d.id = safeTreeId; + d.onclick = toggle; + d.setAttribute("role", "button"); + sep = showSubtrees ? kShowKidsSep : kHideKidsSep; + d.setAttribute("aria-expanded", showSubtrees ? "true" : "false"); + } else { + assert(!aT._hideKids, "leaf node with _hideKids set"); + sep = kNoKidsSep; + d = p; + } + + // The value. + appendElementWithText( + d, + "span", + "mrValue" + (tIsInvalid ? " invalid" : ""), + valueText + ); + + // The percentage (omitted for single entries). + if (!aT._isDegenerate) { + let percText = formatTreeFrac(aT._amount, aRoot._amount); + appendElementWithText(d, "span", "mrPerc", ` (${percText})`); + } + + // The separator. + appendElementWithText(d, "span", "mrSep", sep); + + // The entry's name. + appendMrNameSpan( + d, + aT._description, + aT._unsafeName, + tIsInvalid, + aT._nMerged, + aT._presence + ); + + // In non-verbose mode, invalid nodes can be hidden in collapsed sub-trees. + // But it's good to always see them, so force this. + if (!gVerbose.checked && tIsInvalid) { + expandPathToThisElement(aT._kids ? d : aP); + } + + // Recurse over children. + if (aT._kids) { + // The 'kids' class is just used for sanity checking in toggle(). + d = appendElement(p, "span", showSubtrees ? "kids" : "kids hidden"); + d.setAttribute("role", "list"); + + let tlThisForMost, tlKidsForMost; + if (aT._kids.length > 1) { + tlThisForMost = aTlKids + "├──"; + tlKidsForMost = aTlKids + "│ "; + } + let tlThisForLast = aTlKids + "└──"; + let tlKidsForLast = aTlKids + " "; + + for (let [i, kid] of aT._kids.entries()) { + let isLast = i == aT._kids.length - 1; + aUnsafeNames.push(kid._unsafeName); + appendTreeElements2( + d, + aProcess, + aUnsafeNames, + aRoot, + kid, + !isLast ? tlThisForMost : tlThisForLast, + !isLast ? tlKidsForMost : tlKidsForLast, + valueText.length + ); + aUnsafeNames.pop(); + } + } + } + + let rootStringLength = aRoot.toString().length; + appendTreeElements2( + aP, + aProcess, + [aRoot._unsafeName], + aRoot, + aRoot, + aPadText, + aPadText, + rootStringLength + ); +} + +// --------------------------------------------------------------------------- + +function appendSectionHeader(aP, aText) { + appendElementWithText(aP, "h2", "", aText + "\n"); + let entries = appendElement(aP, "pre", "entries"); + entries.setAttribute("role", "list"); + return entries; +} + +// --------------------------------------------------------------------------- + +function saveReportsToFile() { + let fp = Cc["@mozilla.org/filepicker;1"].createInstance(Ci.nsIFilePicker); + fp.appendFilter("Zipped JSON files", "*.json.gz"); + fp.appendFilters(Ci.nsIFilePicker.filterAll); + fp.filterIndex = 0; + fp.addToRecentDocs = true; + fp.defaultString = "memory-report.json.gz"; + + let fpFinish = function(aFile) { + let dumper = Cc["@mozilla.org/memory-info-dumper;1"].getService( + Ci.nsIMemoryInfoDumper + ); + let finishDumping = () => { + updateMainAndFooter( + "Saved memory reports to " + aFile.path, + SHOW_TIMESTAMP, + HIDE_FOOTER + ); + }; + dumper.dumpMemoryReportsToNamedFile( + aFile.path, + finishDumping, + null, + gAnonymize.checked, + /* minimize memory usage = */ false + ); + }; + + let fpCallback = function(aResult) { + if ( + aResult == Ci.nsIFilePicker.returnOK || + aResult == Ci.nsIFilePicker.returnReplace + ) { + fpFinish(fp.file); + } + }; + + try { + fp.init(window, "Save Memory Reports", Ci.nsIFilePicker.modeSave); + } catch (ex) { + // This will fail on Android, since there is no Save as file picker there. + // Just save to the default downloads dir if it does. + Downloads.getSystemDownloadsDirectory().then(function(aDirPath) { + let file = FileUtils.File(aDirPath); + file.append(fp.defaultString); + fpFinish(file); + }); + + return; + } + fp.open(fpCallback); +} |