[snapshot] support including templates in the snapshot.

src/api.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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 368 matching lines @@
     i::PrintF("Executing custom snapshot script %s took %0.3f ms\n", name,
               timer.Elapsed().InMillisecondsF());
   }
   timer.Stop();
   CHECK(!try_catch.HasCaught());
   return true;
 }
 
 struct SnapshotCreatorData {
   explicit SnapshotCreatorData(Isolate* isolate)
-      : isolate_(isolate), contexts_(isolate), created_(false) {}
+      : isolate_(isolate),
+        contexts_(isolate),
+        templates_(isolate),
+        created_(false) {}
 
   static SnapshotCreatorData* cast(void* data) {
     return reinterpret_cast<SnapshotCreatorData*>(data);
   }
 
   ArrayBufferAllocator allocator_;
   Isolate* isolate_;
   PersistentValueVector<Context> contexts_;
+  PersistentValueVector<Template> templates_;
   bool created_;
 };
 
 }  // namespace
 
 SnapshotCreator::SnapshotCreator(intptr_t* external_references,
                                  StartupData* existing_snapshot) {
   i::Isolate* internal_isolate = new i::Isolate(true);
   Isolate* isolate = reinterpret_cast<Isolate*>(internal_isolate);
   SnapshotCreatorData* data = new SnapshotCreatorData(isolate);
@@ skipping 27 matching lines @@
   DCHECK(!context.IsEmpty());
   SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
   DCHECK(!data->created_);
   Isolate* isolate = data->isolate_;
   CHECK_EQ(isolate, context->GetIsolate());
   size_t index = static_cast<int>(data->contexts_.Size());
   data->contexts_.Append(context);
   return index;
 }
 
+size_t SnapshotCreator::AddTemplate(Local<Template> template_obj) {
+  DCHECK(!template_obj.IsEmpty());
+  SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
+  DCHECK(!data->created_);
+  DCHECK_EQ(reinterpret_cast<i::Isolate*>(data->isolate_),
+            Utils::OpenHandle(*template_obj)->GetIsolate());
+  size_t index = static_cast<int>(data->templates_.Size());
+  data->templates_.Append(template_obj);
+  return index;
+}
+
 StartupData SnapshotCreator::CreateBlob(
     SnapshotCreator::FunctionCodeHandling function_code_handling) {
   SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(data->isolate_);
   DCHECK(!data->created_);
 
+  {
+    int num_templates = static_cast<int>(data->templates_.Size());
+    i::HandleScope scope(isolate);
+    i::Handle<i::FixedArray> templates =
+        isolate->factory()->NewFixedArray(num_templates, i::TENURED);
+    for (int i = 0; i < num_templates; i++) {
+      templates->set(i, *v8::Utils::OpenHandle(*data->templates_.Get(i)));
+    }
+    isolate->heap()->SetSerializedTemplates(*templates);
+    data->templates_.Clear();
+  }
+
   // If we don't do this then we end up with a stray root pointing at the
   // context even after we have disposed of the context.
   isolate->heap()->CollectAllAvailableGarbage("mksnapshot");
   isolate->heap()->CompactWeakFixedArrays();
 
   i::DisallowHeapAllocation no_gc_from_here_on;
 
   int num_contexts = static_cast<int>(data->contexts_.Size());
   i::List<i::Object*> contexts(num_contexts);
   for (int i = 0; i < num_contexts; i++) {
@@ skipping 705 matching lines @@
                                               int length) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   // Changes to the environment cannot be captured in the snapshot. Expect no
   // function templates when the isolate is created for serialization.
   LOG_API(i_isolate, FunctionTemplate, New);
   ENTER_V8(i_isolate);
   return FunctionTemplateNew(i_isolate, callback, nullptr, data, signature,
                              length, false);
 }
 
+Local<FunctionTemplate> FunctionTemplate::FromSnapshot(Isolate* isolate,
+                                                       size_t index) {
+  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  i::FixedArray* templates = i_isolate->heap()->serialized_templates();
+  int int_index = static_cast<int>(index);
+  if (int_index < templates->length()) {
+    i::Object* info = i_isolate->heap()->serialized_templates()->get(int_index);
+    if (info->IsFunctionTemplateInfo()) {
+      return Utils::ToLocal(i::Handle<i::FunctionTemplateInfo>(
+          i::FunctionTemplateInfo::cast(info)));
+    }
+  }
+  return Local<FunctionTemplate>();
+}
 
 Local<FunctionTemplate> FunctionTemplate::NewWithFastHandler(
     Isolate* isolate, FunctionCallback callback,
     experimental::FastAccessorBuilder* fast_handler, v8::Local<Value> data,
     v8::Local<Signature> signature, int length) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   DCHECK(!i_isolate->serializer_enabled());
   LOG_API(i_isolate, FunctionTemplate, NewWithFastHandler);
   ENTER_V8(i_isolate);
   return FunctionTemplateNew(i_isolate, callback, fast_handler, data, signature,
@@ skipping 191 matching lines @@
     obj->set_constructor(*Utils::OpenHandle(*constructor));
   obj->set_internal_field_count(i::Smi::FromInt(0));
   return Utils::ToLocal(obj);
 }
 
 Local<ObjectTemplate> ObjectTemplate::New(
     i::Isolate* isolate, v8::Local<FunctionTemplate> constructor) {
   return ObjectTemplateNew(isolate, constructor, false);
 }
 
+Local<ObjectTemplate> ObjectTemplate::FromSnapshot(Isolate* isolate,
+                                                   size_t index) {
+  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  i::FixedArray* templates = i_isolate->heap()->serialized_templates();
+  int int_index = static_cast<int>(index);
+  if (int_index < templates->length()) {
+    i::Object* info = i_isolate->heap()->serialized_templates()->get(int_index);
+    if (info->IsObjectTemplateInfo()) {
+      return Utils::ToLocal(
+          i::Handle<i::ObjectTemplateInfo>(i::ObjectTemplateInfo::cast(info)));
+    }
+  }
+  return Local<ObjectTemplate>();
+}
+
 // Ensure that the object template has a constructor.  If no
 // constructor is available we create one.
 static i::Handle<i::FunctionTemplateInfo> EnsureConstructor(
     i::Isolate* isolate,
     ObjectTemplate* object_template) {
   i::Object* obj = Utils::OpenHandle(object_template)->constructor();
   if (!obj->IsUndefined(isolate)) {
     i::FunctionTemplateInfo* info = i::FunctionTemplateInfo::cast(obj);
     return i::Handle<i::FunctionTemplateInfo>(info, isolate);
   }
@@ skipping 7425 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8