* Generate contexts involving extensions using partial snapshots.

src/api.cc

 // Copyright 2009 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2716 matching lines @@
   if (templ->constructor()->IsUndefined()) {
     Local<FunctionTemplate> constructor = FunctionTemplate::New();
     Utils::OpenHandle(*constructor)->set_instance_template(*templ);
     templ->set_constructor(*Utils::OpenHandle(*constructor));
   }
   return i::Handle<i::FunctionTemplateInfo>(
     i::FunctionTemplateInfo::cast(templ->constructor()));
 }
 
 
-Persistent<Context> v8::Context::New() {
-  EnsureInitialized("v8::Context::New()");
-  LOG_API("Context::New");
-  ON_BAILOUT("v8::Context::New()", return Persistent<Context>());
-
-  if (i::Bootstrapper::AutoExtensionsExist()) {
-    return New(0);
-  }
-
-  // Enter V8 via an ENTER_V8 scope.
-  Persistent<Context> result;
-  {
-    ENTER_V8;
-    HandleScope scope;
-#if defined(ANDROID)
-    // On mobile device, full GC is expensive, leave it to the system to
-    // decide when should make a full GC.
-#else
-    // Give the heap a chance to cleanup if we've disposed contexts.
-    i::Heap::CollectAllGarbageIfContextDisposed();
-#endif
-    i::Handle<i::Context> env = i::Snapshot::NewContextFromSnapshot();
-    if (env.is_null()) {
-      return New(0);
-    }
-    i::Counters::contexts_created_by_snapshot.Increment();
-    return Persistent<Context>::New(Utils::ToLocal(env));
-  }
-}
-
-
 Persistent<Context> v8::Context::New(
     v8::ExtensionConfiguration* extensions,
     v8::Handle<ObjectTemplate> global_template,
     v8::Handle<Value> global_object) {
   EnsureInitialized("v8::Context::New()");
   LOG_API("Context::New");
   ON_BAILOUT("v8::Context::New()", return Persistent<Context>());
+
+  // Handle the simple cases with partial snapshot deserialization.
+  if (global_template.IsEmpty() && global_object.IsEmpty()) {
+    // Enter V8 via an ENTER_V8 scope.
+    Persistent<Context> result;
+    {
+      ENTER_V8;
+      HandleScope scope;
+#if defined(ANDROID)
+      // On mobile device, full GC is expensive, leave it to the system to
+      // decide when should make a full GC.
+#else
+      // Give the heap a chance to cleanup if we've disposed contexts.
+      i::Heap::CollectAllGarbageIfContextDisposed();
+#endif
+      i::Handle<i::Context> env = i::Snapshot::NewContextFromSnapshot();
+      if (!env.is_null()) {
+        if (i::Bootstrapper::InstallExtensions(env, extensions)) {
+          i::Counters::contexts_created_by_snapshot.Increment();
+          return Persistent<Context>::New(Utils::ToLocal(env));
+        } else {
+          return Persistent<Context>();
+        }
+      }
+      // If there was no snapshot built into the VM then we fall through to the
+      // slow new context builder.
+    }
+  }
+
   i::Counters::contexts_created_from_scratch.Increment();
 
   // Enter V8 via an ENTER_V8 scope.
   i::Handle<i::Context> env;
   {
     ENTER_V8;
 #if defined(ANDROID)
     // On mobile device, full GC is expensive, leave it to the system to
     // decide when should make a full GC.
 #else
@@ skipping 1076 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* thread_local =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   thread_local->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal