Embed custom script into the snapshot.

src/snapshot-common.cc

 // Copyright 2006-2008 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.
 
 // The common functionality when building with or without snapshots.
 
 #include "src/v8.h"
 
 #include "src/api.h"
 #include "src/base/platform/platform.h"
 #include "src/serialize.h"
 #include "src/snapshot.h"
 
 namespace v8 {
 namespace internal {
 
 bool Snapshot::HaveASnapshotToStartFrom() {
   return SnapshotBlob().data != NULL;
 }
 
 
 bool Snapshot::Initialize(Isolate* isolate) {
   if (!HaveASnapshotToStartFrom()) return false;
   base::ElapsedTimer timer;
   if (FLAG_profile_deserialization) timer.Start();
 
   const v8::StartupData blob = SnapshotBlob();
-  SnapshotData snapshot_data(ExtractStartupData(&blob));
+  Vector<const byte> startup_data = ExtractStartupData(&blob);
+  SnapshotData snapshot_data(startup_data);
   Deserializer deserializer(&snapshot_data);
   bool success = isolate->Init(&deserializer);
   if (FLAG_profile_deserialization) {
     double ms = timer.Elapsed().InMillisecondsF();
-    PrintF("[Snapshot loading and deserialization took %0.3f ms]\n", ms);
+    int bytes = startup_data.length();
+    PrintF("[Deserializing isolate (%d bytes) took %0.3f ms]\n", bytes, ms);
   }
   return success;
 }
 
 
 Handle<Context> Snapshot::NewContextFromSnapshot(Isolate* isolate) {
   if (!HaveASnapshotToStartFrom()) return Handle<Context>();
+  base::ElapsedTimer timer;
+  if (FLAG_profile_deserialization) timer.Start();
 
   const v8::StartupData blob = SnapshotBlob();
-  SnapshotData snapshot_data(ExtractContextData(&blob));
+  Vector<const byte> context_data = ExtractContextData(&blob);
+  SnapshotData snapshot_data(context_data);
   Deserializer deserializer(&snapshot_data);
   Object* root;
   deserializer.DeserializePartial(isolate, &root);
   CHECK(root->IsContext());
+  if (FLAG_profile_deserialization) {
+    double ms = timer.Elapsed().InMillisecondsF();
+    int bytes = context_data.length();
+    PrintF("[Deserializing context (%d bytes) took %0.3f ms]\n", bytes, ms);
+  }
   return Handle<Context>(Context::cast(root));
 }
 
 
 v8::StartupData Snapshot::CreateSnapshotBlob(
     const Vector<const byte> startup_data,
     const Vector<const byte> context_data) {
   int startup_length = startup_data.length();
   int context_length = context_data.length();
   int context_offset = kIntSize + startup_length;
@@ skipping 24 matching lines @@
   int startup_length;
   memcpy(&startup_length, data->data, kIntSize);
   int context_offset = kIntSize + startup_length;
   const byte* context_data =
       reinterpret_cast<const byte*>(data->data + context_offset);
   DCHECK_LT(context_offset, data->raw_size);
   int context_length = data->raw_size - context_offset;
   return Vector<const byte>(context_data, context_length);
 }
 } }  // namespace v8::internal