Introduce BeforeCallEnteredCallback.

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 2591 matching lines @@
 
     SetUpSubregistry(registry, map, "for");
     SetUpSubregistry(registry, map, "for_api");
     SetUpSubregistry(registry, map, "keyFor");
     SetUpSubregistry(registry, map, "private_api");
   }
   return Handle<JSObject>::cast(factory()->symbol_registry());
 }
 
 
+void Isolate::AddBeforeCallEnteredCallback(BeforeCallEnteredCallback callback) {
+  for (int i = 0; i < before_call_entered_callbacks_.length(); i++) {
+    if (callback == before_call_entered_callbacks_.at(i)) return;
+  }
+  before_call_entered_callbacks_.Add(callback);
+}
+
+
+void Isolate::RemoveBeforeCallEnteredCallback(
+    BeforeCallEnteredCallback callback) {
+  for (int i = 0; i < before_call_entered_callbacks_.length(); i++) {
+    if (callback == before_call_entered_callbacks_.at(i)) {
+      before_call_entered_callbacks_.Remove(i);
+    }
+  }
+}
+
+
+void Isolate::FireBeforeCallEnteredCallback() {
+  for (int i = 0; i < before_call_entered_callbacks_.length(); i++) {
+    before_call_entered_callbacks_.at(i)(reinterpret_cast<v8::Isolate*>(this));
+  }
+}
+
+
 void Isolate::AddCallCompletedCallback(CallCompletedCallback callback) {
   for (int i = 0; i < call_completed_callbacks_.length(); i++) {
     if (callback == call_completed_callbacks_.at(i)) return;
   }
   call_completed_callbacks_.Add(callback);
 }
 
 
 void Isolate::RemoveCallCompletedCallback(CallCompletedCallback callback) {
   for (int i = 0; i < call_completed_callbacks_.length(); i++) {
@@ skipping 236 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8