Support merged Dart-JS callstacks

Source/bindings/v8/V8RecursionScope.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef V8RecursionScope_h
 #define V8RecursionScope_h
 
+#include "bindings/common/StackTrace.h"
 #include "bindings/v8/V8PerIsolateData.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/dom/ScriptForbiddenScope.h"
 #include "wtf/Noncopyable.h"
 #include <v8.h>
 
 namespace WebCore {
 
 // C++ calls into script contexts which are "owned" by WebKit (created in a
 // process where WebKit.cpp initializes v8) must declare their type:
 //
 //   1. Calls into page/author script from a frame
 //   2. Calls into page/author script from a worker
 //   3. Calls into internal script (typically setup/teardown work)
 //
 // Debug-time checking of this is enforced via this class.
 //
 // Calls of type (1) should generally go through ScriptController, as inspector
 // instrumentation is needed. ScriptController allocates V8RecursionScope for you.
 // Calls of type (2) should always stack-allocate a V8RecursionScope in the same
 // block as the call into script. Calls of type (3) should stack allocate a
 // V8RecursionScope::MicrotaskSuppression -- this skips work that is spec'd to
 // happen at the end of the outer-most script stack frame of calls into page script:
 //
 // http://www.whatwg.org/specs/web-apps/current-work/#perform-a-microtask-checkpoint
 class V8RecursionScope {
     WTF_MAKE_NONCOPYABLE(V8RecursionScope);
 public:
-    V8RecursionScope(v8::Isolate* isolate, ExecutionContext* context)
+    V8RecursionScope(v8::Isolate* isolate, ExecutionContext* context, bool shouldTrackStackDepth = true)
         : m_isolate(isolate)
         , m_executionContext(context)
+        , m_shouldTrackStackDepth(shouldTrackStackDepth)
     {
-        V8PerIsolateData::from(m_isolate)->incrementRecursionLevel();
+        V8PerIsolateData* isolateData = V8PerIsolateData::from(m_isolate);
+
+        if (shouldTrackStackDepth)
+            trackStackDepth(isolateData);
+        isolateData->incrementRecursionLevel();
         ASSERT(!ScriptForbiddenScope::isScriptForbidden());
         // If you want V8 to autorun microtasks, this class needs to have a
         // v8::Isolate::SuppressMicrotaskExecutionScope member.
         ASSERT(!isolate->WillAutorunMicrotasks());
     }
 
     ~V8RecursionScope()
     {
-        if (!V8PerIsolateData::from(m_isolate)->decrementRecursionLevel())
+        V8PerIsolateData* isolateData = V8PerIsolateData::from(m_isolate);
+        if (m_shouldTrackStackDepth)
+            isolateData->stackTraceTimestampTracker()->decrementRecursionLevel();
+        if (!isolateData->decrementRecursionLevel())
             didLeaveScriptContext();
     }
 
     static int recursionLevel(v8::Isolate* isolate)
     {
         return V8PerIsolateData::from(isolate)->recursionLevel();
     }
 
 #ifndef NDEBUG
     static bool properlyUsed(v8::Isolate* isolate)
@@ skipping 23 matching lines @@
         }
 
     private:
 #ifndef NDEBUG
         v8::Isolate* m_isolate;
 #endif
     };
 
 private:
     void didLeaveScriptContext();
+    void trackStackDepth(V8PerIsolateData*);
 
     v8::Isolate* m_isolate;
     // FIXME: This is a reference in upstream Blink. In Dartium, it can
     // be null when instantiated from a DartUtilities::V8Scope.
     ExecutionContext* m_executionContext;
+    bool m_shouldTrackStackDepth;
 };
 
 } // namespace WebCore
 
 #endif // V8RecursionScope_h