content/shell/renderer/leak_detector.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/shell/renderer/leak_detector.h"
   6
   7 #include "base/json/json_writer.h"
   8 #include "base/logging.h"
   9 #include "base/values.h"
  10 #include "third_party/WebKit/public/web/WebLeakDetector.h"
  11
  12 using blink::WebLeakDetector;
  13
  14 namespace content {
  15
  16 // The initial states of the DOM objects at about:blank. The four nodes are a
  17 // Document, a HTML, a HEAD and a BODY.
  18 //
  19 // TODO(hajimehoshi): Now these are hard-corded. If we add target to count like
  20 // RefCoutned objects whose initial state is diffcult to estimate, we stop using
  21 // hard-coded values. Instead, we need to load about:blank ahead of the layout
  22 // tests actually and initialize LeakDetector by the got values.
  23 const int kInitialNumberOfLiveDocuments = 1;
  24 const int kInitialNumberOfLiveNodes = 4;
  25
  26 LeakDetector::LeakDetector()
  27     : previous_number_of_live_documents_(kInitialNumberOfLiveDocuments),
  28       previous_number_of_live_nodes_(kInitialNumberOfLiveNodes) {
  29 }
  30
  31 LeakDetectionResult LeakDetector::TryLeakDetection(blink::WebFrame* frame) {
  32   LeakDetectionResult result;
  33   unsigned number_of_live_documents = 0;
  34   unsigned number_of_live_nodes = 0;
  35
  36   WebLeakDetector::collectGarbargeAndGetDOMCounts(
  37       frame, &number_of_live_documents, &number_of_live_nodes);
  38
  39   result.leaked =
  40       (previous_number_of_live_documents_ < number_of_live_documents ||
  41        previous_number_of_live_nodes_ < number_of_live_nodes);
  42
  43   if (result.leaked) {
  44     base::DictionaryValue detail;
  45     base::ListValue* list = new base::ListValue();
  46     list->AppendInteger(previous_number_of_live_documents_);
  47     list->AppendInteger(number_of_live_documents);
  48     detail.Set("numberOfLiveDocuments", list);
  49
  50     list = new base::ListValue();
  51     list->AppendInteger(previous_number_of_live_nodes_);
  52     list->AppendInteger(number_of_live_nodes);
  53     detail.Set("numberOfLiveNodes", list);
  54
  55     std::string detail_str;
  56     base::JSONWriter::Write(&detail, &detail_str);
  57     result.detail = detail_str;
  58   }
  59
  60   previous_number_of_live_documents_ = number_of_live_documents;
  61   previous_number_of_live_nodes_ = number_of_live_nodes;
  62
  63   return result;
  64 }
  65
  66 }  // namespace content