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      1 /*
      2  * Copyright (c) 2010, 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 "ScriptProfiler.h"
     33 
     34 #include "InspectorValues.h"
     35 #include "RetainedDOMInfo.h"
     36 #include "V8Binding.h"
     37 #include "V8Node.h"
     38 
     39 #include <v8-profiler.h>
     40 
     41 namespace WebCore {
     42 
     43 #if ENABLE(INSPECTOR)
     44 void ScriptProfiler::start(ScriptState* state, const String& title)
     45 {
     46     v8::HandleScope hs;
     47     v8::CpuProfiler::StartProfiling(v8String(title));
     48 }
     49 
     50 PassRefPtr<ScriptProfile> ScriptProfiler::stop(ScriptState* state, const String& title)
     51 {
     52     v8::HandleScope hs;
     53     const v8::CpuProfile* profile = state ?
     54         v8::CpuProfiler::StopProfiling(v8String(title), state->context()->GetSecurityToken()) :
     55         v8::CpuProfiler::StopProfiling(v8String(title));
     56     return profile ? ScriptProfile::create(profile) : 0;
     57 }
     58 
     59 void ScriptProfiler::collectGarbage()
     60 {
     61     // NOTE : There is currently no direct way to collect memory from the v8 C++ API
     62     // but notifying low-memory forces a mark-compact, which is exactly what we want
     63     // in this case.
     64     v8::V8::LowMemoryNotification();
     65 }
     66 
     67 namespace {
     68 
     69 class ActivityControlAdapter : public v8::ActivityControl {
     70 public:
     71     ActivityControlAdapter(ScriptProfiler::HeapSnapshotProgress* progress)
     72             : m_progress(progress), m_firstReport(true) { }
     73     ControlOption ReportProgressValue(int done, int total)
     74     {
     75         ControlOption result = m_progress->isCanceled() ? kAbort : kContinue;
     76         if (m_firstReport) {
     77             m_firstReport = false;
     78             m_progress->Start(total);
     79         } else
     80             m_progress->Worked(done);
     81         if (done >= total)
     82             m_progress->Done();
     83         return result;
     84     }
     85 private:
     86     ScriptProfiler::HeapSnapshotProgress* m_progress;
     87     bool m_firstReport;
     88 };
     89 
     90 } // namespace
     91 
     92 PassRefPtr<ScriptHeapSnapshot> ScriptProfiler::takeHeapSnapshot(const String& title, HeapSnapshotProgress* control)
     93 {
     94     v8::HandleScope hs;
     95     const v8::HeapSnapshot* snapshot = 0;
     96     if (control) {
     97         ActivityControlAdapter adapter(control);
     98         snapshot = v8::HeapProfiler::TakeSnapshot(v8String(title), v8::HeapSnapshot::kFull, &adapter);
     99     } else
    100         snapshot = v8::HeapProfiler::TakeSnapshot(v8String(title), v8::HeapSnapshot::kAggregated);
    101     return snapshot ? ScriptHeapSnapshot::create(snapshot) : 0;
    102 }
    103 
    104 static v8::RetainedObjectInfo* retainedDOMInfo(uint16_t classId, v8::Handle<v8::Value> wrapper)
    105 {
    106     ASSERT(classId == v8DOMSubtreeClassId);
    107     if (!wrapper->IsObject())
    108         return 0;
    109     Node* node = V8Node::toNative(wrapper.As<v8::Object>());
    110     return node ? new RetainedDOMInfo(node) : 0;
    111 }
    112 #endif // ENABLE(INSPECTOR)
    113 
    114 void ScriptProfiler::initialize()
    115 {
    116 #if ENABLE(INSPECTOR)
    117     v8::HeapProfiler::DefineWrapperClass(v8DOMSubtreeClassId, &retainedDOMInfo);
    118 #endif // ENABLE(INSPECTOR)
    119 }
    120 
    121 
    122 } // namespace WebCore
    123