gecko-dev/dom/base/nsDOMMemoryReporter.cpp

242 lines
7.8 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla code.
*
* The Initial Developer of the Original Code is Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Mounir Lamouri <mounir.lamouri@mozilla.com> (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsDOMMemoryReporter.h"
#include "nsGlobalWindow.h"
nsDOMMemoryMultiReporter::nsDOMMemoryMultiReporter()
{
}
NS_IMPL_ISUPPORTS1(nsDOMMemoryMultiReporter, nsIMemoryMultiReporter)
/* static */
void
nsDOMMemoryMultiReporter::Init()
{
// The memory reporter manager is going to own this object.
NS_RegisterMemoryMultiReporter(new nsDOMMemoryMultiReporter());
}
static bool
AppendWindowURI(nsGlobalWindow *aWindow, nsACString& aStr)
{
nsCOMPtr<nsIDocument> doc = do_QueryInterface(aWindow->GetExtantDocument());
nsCOMPtr<nsIURI> uri;
if (doc) {
uri = doc->GetDocumentURI();
}
if (!uri) {
nsIPrincipal *principal = aWindow->GetPrincipal();
if (principal) {
principal->GetURI(getter_AddRefs(uri));
}
}
if (!uri) {
return false;
}
nsCString spec;
uri->GetSpec(spec);
// A hack: replace forward slashes with '\\' so they aren't
// treated as path separators. Users of the reporters
// (such as about:memory) have to undo this change.
spec.ReplaceChar('/', '\\');
aStr += spec;
return true;
}
static void
CollectWindowMemoryUsage(nsGlobalWindow *aWindow,
nsIMemoryMultiReporterCallback *aCb,
nsISupports *aClosure)
{
NS_NAMED_LITERAL_CSTRING(kWindowDesc,
"Memory used by a window and the DOM within it.");
// DOM window objects fall into one of three categories:
// - "active" windows are currently either displayed in an active
// tab, or a child of such a window.
// - "cached" windows are in the fastback cache.
// - "other" windows are closed (or navigated away from w/o being
// cached) yet held alive by either a website or our code. The
// latter case may be a memory leak, but not necessarily.
//
// For inner windows we show how much memory the window and its
// document etc use, and we report those per URI, where the URI is
// the document URI, if available, or the codebase of the principal
// in the window. In the case where we're unable to find a URI we're
// dealing with a chrome window with no document in it (or
// somesuch), and for that we make the URI be the string "[system]".
//
// For outer windows we simply group them all together and just show
// the combined count and amount of memory used, which is generally
// a constant amount per window (since all the actual data lives in
// the inner window).
//
// The path we give to the reporter callback for inner windows are
// as follows:
//
// explicit/dom/window-objects/<category>/top=<top-outer-id> (inner=<top-inner-id>)/inner-window(id=<id>, uri=<uri>)
//
// Where:
// - <category> is active, cached, or other, as described above.
// - <top-outer-id> is the window id (nsPIDOMWindow::WindowID()) of
// the top outer window (i.e. tab, or top level chrome window).
// - <top-inner-id> is the window id of the top window's inner
// window.
// - <id> is the window id of the inner window in question.
// - <uri> is the URI per above description.
//
// Exposing the window ids is done to get logical grouping in
// about:memory, and also for debuggability since one can get to the
// nsGlobalWindow for a window id by calling the static method
// nsGlobalWindow::GetInnerWindowWithId(id) (or
// GetOuterWindowWithId(id) in a debugger.
//
// For outer windows we simply use:
//
// explicit/dom/window-objects/<category>/outer-windows
//
// Which gives us simple counts of how many outer windows (and their
// combined sizes) per category.
nsCAutoString str("explicit/dom/window-objects/");
nsIDocShell *docShell = aWindow->GetDocShell();
nsGlobalWindow *top = aWindow->GetTop();
PRInt64 windowSize = aWindow->SizeOf();
if (docShell && aWindow->IsFrozen()) {
str += NS_LITERAL_CSTRING("cached/");
} else if (docShell) {
str += NS_LITERAL_CSTRING("active/");
} else {
str += NS_LITERAL_CSTRING("other/");
}
if (aWindow->IsInnerWindow()) {
str += NS_LITERAL_CSTRING("top=");
if (top) {
str.AppendInt(top->WindowID());
nsGlobalWindow *topInner = top->GetCurrentInnerWindowInternal();
if (topInner) {
str += NS_LITERAL_CSTRING(" (inner=");
str.AppendInt(topInner->WindowID());
str += NS_LITERAL_CSTRING(")");
}
} else {
str += NS_LITERAL_CSTRING("none");
}
str += NS_LITERAL_CSTRING("/inner-window(id=");
str.AppendInt(aWindow->WindowID());
str += NS_LITERAL_CSTRING(", uri=");
if (!AppendWindowURI(aWindow, str)) {
str += NS_LITERAL_CSTRING("[system]");
}
str += NS_LITERAL_CSTRING(")");
} else {
// Combine all outer windows per section (active/cached/other) as
// they basically never contain anything of interest, and are
// always pretty much the same size.
str += NS_LITERAL_CSTRING("outer-windows");
}
aCb->Callback(EmptyCString(), str, nsIMemoryReporter::KIND_HEAP,
nsIMemoryReporter::UNITS_BYTES, windowSize, kWindowDesc,
aClosure);
}
typedef nsTArray< nsRefPtr<nsGlobalWindow> > WindowArray;
static
PLDHashOperator
GetWindows(const PRUint64& aId, nsGlobalWindow*& aWindow, void* aClosure)
{
((WindowArray *)aClosure)->AppendElement(aWindow);
return PL_DHASH_NEXT;
}
NS_IMETHODIMP
nsDOMMemoryMultiReporter::CollectReports(nsIMemoryMultiReporterCallback* aCb,
nsISupports* aClosure)
{
nsGlobalWindow::WindowByIdTable* windowsById =
nsGlobalWindow::GetWindowsTable();
NS_ENSURE_TRUE(windowsById, NS_OK);
// Hold on to every window in memory so that window objects can't be
// destroyed while we're calling the memory reporter callback.
WindowArray windows;
windowsById->Enumerate(GetWindows, &windows);
// Collect window memory usage.
nsRefPtr<nsGlobalWindow> *w = windows.Elements();
nsRefPtr<nsGlobalWindow> *end = w + windows.Length();
for (; w != end; ++w) {
CollectWindowMemoryUsage(*w, aCb, aClosure);
}
return NS_OK;
}
NS_IMETHODIMP
nsDOMMemoryMultiReporter::GetExplicitNonHeap(PRInt64* aAmount)
{
// This reporter only measures heap memory.
*aAmount = 0;
return NS_OK;
}