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      1 /*
      2  * Copyright (C) 2012 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 
     33 #include "public/platform/Platform.h"
     34 #include "public/platform/WebUnitTestSupport.h"
     35 #include "public/web/WebView.h"
     36 #include "web/tests/FrameTestHelpers.h"
     37 #include "web/tests/URLTestHelpers.h"
     38 #include <gtest/gtest.h>
     39 #include <v8/include/v8-profiler.h>
     40 #include <v8/include/v8.h>
     41 
     42 using namespace blink;
     43 
     44 namespace {
     45 
     46 const v8::HeapGraphNode* GetProperty(const v8::HeapGraphNode* node, v8::HeapGraphEdge::Type type, const char* name)
     47 {
     48     for (int i = 0, count = node->GetChildrenCount(); i < count; ++i) {
     49         const v8::HeapGraphEdge* prop = node->GetChild(i);
     50         if (prop->GetType() == type) {
     51             v8::String::Utf8Value propName(prop->GetName());
     52             if (!strcmp(name, *propName))
     53                 return prop->GetToNode();
     54         }
     55     }
     56     return 0;
     57 }
     58 
     59 int GetNumObjects(const char* constructor)
     60 {
     61     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     62     v8::HandleScope scope(isolate);
     63     v8::HeapProfiler* profiler = isolate->GetHeapProfiler();
     64     const v8::HeapSnapshot* snapshot = profiler->TakeHeapSnapshot(v8::String::NewFromUtf8(isolate, ""));
     65     if (!snapshot)
     66         return -1;
     67     int count = 0;
     68     for (int i = 0; i < snapshot->GetNodesCount(); ++i) {
     69         const v8::HeapGraphNode* node = snapshot->GetNode(i);
     70         if (node->GetType() != v8::HeapGraphNode::kObject)
     71             continue;
     72         v8::String::Utf8Value nodeName(node->GetName());
     73         if (!strcmp(constructor, *nodeName)) {
     74             const v8::HeapGraphNode* constructorProp = GetProperty(node, v8::HeapGraphEdge::kProperty, "constructor");
     75             // Skip an Object instance named after the constructor.
     76             if (constructorProp) {
     77                 v8::String::Utf8Value constructorName(constructorProp->GetName());
     78                 if (!strcmp(constructor, *constructorName))
     79                     continue;
     80             }
     81             ++count;
     82         }
     83     }
     84     return count;
     85 }
     86 
     87 
     88 class ListenerLeakTest : public testing::Test {
     89 public:
     90     void RunTest(const std::string& filename)
     91     {
     92         std::string baseURL("http://www.example.com/");
     93         std::string fileName(filename);
     94         bool executeScript = true;
     95         URLTestHelpers::registerMockedURLFromBaseURL(WebString::fromUTF8(baseURL.c_str()), WebString::fromUTF8(fileName.c_str()));
     96         webViewHelper.initializeAndLoad(baseURL + fileName, executeScript);
     97     }
     98 
     99     virtual void TearDown() OVERRIDE
    100     {
    101         Platform::current()->unitTestSupport()->unregisterAllMockedURLs();
    102     }
    103 
    104 protected:
    105     FrameTestHelpers::WebViewHelper webViewHelper;
    106 };
    107 
    108 
    109 // This test tries to create a reference cycle between node and its listener.
    110 // See http://crbug/17400.
    111 TEST_F(ListenerLeakTest, ReferenceCycle)
    112 {
    113     RunTest("listener/listener_leak1.html");
    114     ASSERT_EQ(0, GetNumObjects("EventListenerLeakTestObject1"));
    115 }
    116 
    117 // This test sets node onclick many times to expose a possible memory
    118 // leak where all listeners get referenced by the node.
    119 TEST_F(ListenerLeakTest, HiddenReferences)
    120 {
    121     RunTest("listener/listener_leak2.html");
    122     ASSERT_EQ(1, GetNumObjects("EventListenerLeakTestObject2"));
    123 }
    124 
    125 } // namespace
    126