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1 /*
2  * Copyright (c) 2011, 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 #include "bindings/core/v8/ScriptProfiler.h"
33 
34 #include "bindings/core/v8/RetainedDOMInfo.h"
35 #include "bindings/core/v8/ScriptValue.h"
36 #include "bindings/core/v8/V8Binding.h"
37 #include "bindings/core/v8/V8Node.h"
38 #include "bindings/core/v8/V8Window.h"
39 #include "bindings/core/v8/WrapperTypeInfo.h"
40 #include "core/dom/Document.h"
41 #include "core/inspector/BindingVisitors.h"
42 #include "wtf/ThreadSpecific.h"
43 
44 #include <v8-profiler.h>
45 #include <v8.h>
46 
47 namespace blink {
48 
49 typedef HashMap<String, double> ProfileNameIdleTimeMap;
50 
setSamplingInterval(int intervalUs)51 void ScriptProfiler::setSamplingInterval(int intervalUs)
52 {
53     v8::Isolate* isolate = v8::Isolate::GetCurrent();
54     v8::CpuProfiler* profiler = isolate->GetCpuProfiler();
55     if (profiler)
56         profiler->SetSamplingInterval(intervalUs);
57 }
58 
start(const String & title)59 void ScriptProfiler::start(const String& title)
60 {
61     ProfileNameIdleTimeMap* profileNameIdleTimeMap = ScriptProfiler::currentProfileNameIdleTimeMap();
62     if (profileNameIdleTimeMap->contains(title))
63         return;
64     profileNameIdleTimeMap->add(title, 0);
65 
66     v8::Isolate* isolate = v8::Isolate::GetCurrent();
67     v8::CpuProfiler* profiler = isolate->GetCpuProfiler();
68     if (!profiler)
69         return;
70     v8::HandleScope handleScope(isolate);
71     profiler->StartProfiling(v8String(isolate, title), true);
72 }
73 
stop(const String & title)74 PassRefPtrWillBeRawPtr<ScriptProfile> ScriptProfiler::stop(const String& title)
75 {
76     v8::Isolate* isolate = v8::Isolate::GetCurrent();
77     v8::CpuProfiler* profiler = isolate->GetCpuProfiler();
78     if (!profiler)
79         return nullptr;
80     v8::HandleScope handleScope(isolate);
81     v8::CpuProfile* profile = profiler->StopProfiling(v8String(isolate, title));
82     if (!profile)
83         return nullptr;
84 
85     String profileTitle = toCoreString(profile->GetTitle());
86     double idleTime = 0.0;
87     ProfileNameIdleTimeMap* profileNameIdleTimeMap = ScriptProfiler::currentProfileNameIdleTimeMap();
88     ProfileNameIdleTimeMap::iterator profileIdleTime = profileNameIdleTimeMap->find(profileTitle);
89     if (profileIdleTime != profileNameIdleTimeMap->end()) {
90         idleTime = profileIdleTime->value * 1000.0;
91         profileNameIdleTimeMap->remove(profileIdleTime);
92     }
93 
94     return ScriptProfile::create(profile, idleTime);
95 }
96 
collectGarbage()97 void ScriptProfiler::collectGarbage()
98 {
99     v8::Isolate::GetCurrent()->LowMemoryNotification();
100 }
101 
objectByHeapObjectId(unsigned id)102 ScriptValue ScriptProfiler::objectByHeapObjectId(unsigned id)
103 {
104     v8::Isolate* isolate = v8::Isolate::GetCurrent();
105     v8::HeapProfiler* profiler = isolate->GetHeapProfiler();
106     v8::HandleScope handleScope(isolate);
107     v8::Handle<v8::Value> value = profiler->FindObjectById(id);
108     if (value.IsEmpty() || !value->IsObject())
109         return ScriptValue();
110 
111     v8::Handle<v8::Object> object = value.As<v8::Object>();
112 
113     if (object->InternalFieldCount() >= v8DefaultWrapperInternalFieldCount) {
114         v8::Handle<v8::Value> wrapper = object->GetInternalField(v8DOMWrapperObjectIndex);
115         // Skip wrapper boilerplates which are like regular wrappers but don't have
116         // native object.
117         if (!wrapper.IsEmpty() && wrapper->IsUndefined())
118             return ScriptValue();
119     }
120 
121     ScriptState* scriptState = ScriptState::from(object->CreationContext());
122     return ScriptValue(scriptState, object);
123 }
124 
getHeapObjectId(const ScriptValue & value)125 unsigned ScriptProfiler::getHeapObjectId(const ScriptValue& value)
126 {
127     v8::Isolate* isolate = v8::Isolate::GetCurrent();
128     v8::HeapProfiler* profiler = isolate->GetHeapProfiler();
129     v8::SnapshotObjectId id = profiler->GetObjectId(value.v8Value());
130     return id;
131 }
132 
clearHeapObjectIds()133 void ScriptProfiler::clearHeapObjectIds()
134 {
135     v8::Isolate* isolate = v8::Isolate::GetCurrent();
136     v8::HeapProfiler* profiler = isolate->GetHeapProfiler();
137     profiler->ClearObjectIds();
138 }
139 
140 namespace {
141 
142 class ActivityControlAdapter FINAL : public v8::ActivityControl {
143 public:
ActivityControlAdapter(ScriptProfiler::HeapSnapshotProgress * progress)144     ActivityControlAdapter(ScriptProfiler::HeapSnapshotProgress* progress)
145         : m_progress(progress), m_firstReport(true) { }
ReportProgressValue(int done,int total)146     virtual ControlOption ReportProgressValue(int done, int total) OVERRIDE
147     {
148         ControlOption result = m_progress->isCanceled() ? kAbort : kContinue;
149         if (m_firstReport) {
150             m_firstReport = false;
151             m_progress->Start(total);
152         } else {
153             m_progress->Worked(done);
154         }
155         if (done >= total)
156             m_progress->Done();
157         return result;
158     }
159 private:
160     ScriptProfiler::HeapSnapshotProgress* m_progress;
161     bool m_firstReport;
162 };
163 
164 class GlobalObjectNameResolver FINAL : public v8::HeapProfiler::ObjectNameResolver {
165 public:
GetName(v8::Handle<v8::Object> object)166     virtual const char* GetName(v8::Handle<v8::Object> object) OVERRIDE
167     {
168         LocalDOMWindow* window = toDOMWindow(object, v8::Isolate::GetCurrent());
169         if (!window)
170             return 0;
171         CString url = window->document()->url().string().utf8();
172         m_strings.append(url);
173         return url.data();
174     }
175 
176 private:
177     Vector<CString> m_strings;
178 };
179 
180 } // namespace
181 
startTrackingHeapObjects(bool trackAllocations)182 void ScriptProfiler::startTrackingHeapObjects(bool trackAllocations)
183 {
184     v8::Isolate::GetCurrent()->GetHeapProfiler()->StartTrackingHeapObjects(trackAllocations);
185 }
186 
187 namespace {
188 
189 class HeapStatsStream : public v8::OutputStream {
190 public:
HeapStatsStream(ScriptProfiler::OutputStream * stream)191     HeapStatsStream(ScriptProfiler::OutputStream* stream) : m_stream(stream) { }
EndOfStream()192     virtual void EndOfStream() OVERRIDE { }
193 
WriteAsciiChunk(char * data,int size)194     virtual WriteResult WriteAsciiChunk(char* data, int size) OVERRIDE
195     {
196         ASSERT(false);
197         return kAbort;
198     }
199 
WriteHeapStatsChunk(v8::HeapStatsUpdate * updateData,int count)200     virtual WriteResult WriteHeapStatsChunk(v8::HeapStatsUpdate* updateData, int count) OVERRIDE
201     {
202         Vector<uint32_t> rawData(count * 3);
203         for (int i = 0; i < count; ++i) {
204             int offset = i * 3;
205             rawData[offset] = updateData[i].index;
206             rawData[offset + 1] = updateData[i].count;
207             rawData[offset + 2] = updateData[i].size;
208         }
209         m_stream->write(rawData.data(), rawData.size());
210         return kContinue;
211     }
212 
213 private:
214     ScriptProfiler::OutputStream* m_stream;
215 };
216 
217 }
218 
requestHeapStatsUpdate(ScriptProfiler::OutputStream * stream)219 unsigned ScriptProfiler::requestHeapStatsUpdate(ScriptProfiler::OutputStream* stream)
220 {
221     HeapStatsStream heapStatsStream(stream);
222     return v8::Isolate::GetCurrent()->GetHeapProfiler()->GetHeapStats(&heapStatsStream);
223 }
224 
stopTrackingHeapObjects()225 void ScriptProfiler::stopTrackingHeapObjects()
226 {
227     v8::Isolate::GetCurrent()->GetHeapProfiler()->StopTrackingHeapObjects();
228 }
229 
230 // FIXME: This method should receive a ScriptState, from which we should retrieve an Isolate.
takeHeapSnapshot(const String & title,HeapSnapshotProgress * control)231 PassRefPtr<ScriptHeapSnapshot> ScriptProfiler::takeHeapSnapshot(const String& title, HeapSnapshotProgress* control)
232 {
233     v8::Isolate* isolate = v8::Isolate::GetCurrent();
234     v8::HeapProfiler* profiler = isolate->GetHeapProfiler();
235     if (!profiler)
236         return nullptr;
237     v8::HandleScope handleScope(isolate);
238     ASSERT(control);
239     ActivityControlAdapter adapter(control);
240     GlobalObjectNameResolver resolver;
241     const v8::HeapSnapshot* snapshot = profiler->TakeHeapSnapshot(v8String(isolate, title), &adapter, &resolver);
242     return snapshot ? ScriptHeapSnapshot::create(snapshot) : nullptr;
243 }
244 
retainedDOMInfo(uint16_t classId,v8::Handle<v8::Value> wrapper)245 static v8::RetainedObjectInfo* retainedDOMInfo(uint16_t classId, v8::Handle<v8::Value> wrapper)
246 {
247     ASSERT(classId == WrapperTypeInfo::NodeClassId);
248     if (!wrapper->IsObject())
249         return 0;
250     Node* node = V8Node::toImpl(wrapper.As<v8::Object>());
251     return node ? new RetainedDOMInfo(node) : 0;
252 }
253 
initialize()254 void ScriptProfiler::initialize()
255 {
256     v8::Isolate* isolate = v8::Isolate::GetCurrent();
257     v8::HeapProfiler* profiler = isolate->GetHeapProfiler();
258     if (profiler)
259         profiler->SetWrapperClassInfoProvider(WrapperTypeInfo::NodeClassId, &retainedDOMInfo);
260 }
261 
visitNodeWrappers(WrappedNodeVisitor * visitor)262 void ScriptProfiler::visitNodeWrappers(WrappedNodeVisitor* visitor)
263 {
264     // visitNodeWrappers() should receive a ScriptState and retrieve an Isolate
265     // from the ScriptState.
266     v8::Isolate* isolate = v8::Isolate::GetCurrent();
267     v8::HandleScope handleScope(isolate);
268 
269     class DOMNodeWrapperVisitor : public v8::PersistentHandleVisitor {
270     public:
271         DOMNodeWrapperVisitor(WrappedNodeVisitor* visitor, v8::Isolate* isolate)
272             : m_visitor(visitor)
273             , m_isolate(isolate)
274         {
275         }
276 
277         virtual void VisitPersistentHandle(v8::Persistent<v8::Value>* value, uint16_t classId) OVERRIDE
278         {
279             if (classId != WrapperTypeInfo::NodeClassId)
280                 return;
281             // Casting to Handle is safe here, since the Persistent cannot get
282             // GCd during visiting.
283             v8::Handle<v8::Object>* wrapper = reinterpret_cast<v8::Handle<v8::Object>*>(value);
284             ASSERT_UNUSED(m_isolate, V8Node::hasInstance(*wrapper, m_isolate));
285             ASSERT((*wrapper)->IsObject());
286             m_visitor->visitNode(V8Node::toImpl(*wrapper));
287         }
288 
289     private:
290         WrappedNodeVisitor* m_visitor;
291         v8::Isolate* m_isolate;
292     } wrapperVisitor(visitor, isolate);
293 
294     v8::V8::VisitHandlesWithClassIds(&wrapperVisitor);
295 }
296 
currentProfileNameIdleTimeMap()297 ProfileNameIdleTimeMap* ScriptProfiler::currentProfileNameIdleTimeMap()
298 {
299     AtomicallyInitializedStatic(WTF::ThreadSpecific<ProfileNameIdleTimeMap>*, map = new WTF::ThreadSpecific<ProfileNameIdleTimeMap>);
300     return *map;
301 }
302 
setIdle(bool isIdle)303 void ScriptProfiler::setIdle(bool isIdle)
304 {
305     v8::Isolate* isolate = v8::Isolate::GetCurrent();
306     if (v8::CpuProfiler* profiler = isolate->GetCpuProfiler())
307         profiler->SetIdle(isIdle);
308 }
309 
310 } // namespace blink
311