WIP: Allow ValueSerializer clients to transfer long strings out of band.

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 3112 matching lines @@
       isolate->error_function(), i::MessageTemplate::kDataCloneError,
       Utils::OpenHandle(*shared_array_buffer)));
   return Nothing<uint32_t>();
 }
 
 Maybe<uint32_t> ValueSerializer::Delegate::GetWasmModuleTransferId(
     Isolate* v8_isolate, Local<WasmCompiledModule> module) {
   return Nothing<uint32_t>();
 }
 
+Maybe<uint32_t> ValueSerializer::Delegate::GetLongStringId(
+    Isolate* v8_isolate, Local<String> string) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
+  isolate->ScheduleThrow(*isolate->factory()->NewError(
+      isolate->error_function(), i::MessageTemplate::kDataCloneError,
+      Utils::OpenHandle(*string)));
+  return Nothing<uint32_t>();
+}
+
 void* ValueSerializer::Delegate::ReallocateBufferMemory(void* old_buffer,
                                                         size_t size,
                                                         size_t* actual_size) {
   *actual_size = size;
   return realloc(old_buffer, size);
 }
 
 void ValueSerializer::Delegate::FreeBufferMemory(void* buffer) {
   return free(buffer);
 }
@@ skipping 13 matching lines @@
           new PrivateData(reinterpret_cast<i::Isolate*>(isolate), delegate)) {}
 
 ValueSerializer::~ValueSerializer() { delete private_; }
 
 void ValueSerializer::WriteHeader() { private_->serializer.WriteHeader(); }
 
 void ValueSerializer::SetTreatArrayBufferViewsAsHostObjects(bool mode) {
   private_->serializer.SetTreatArrayBufferViewsAsHostObjects(mode);
 }
 
+void ValueSerializer::SetMinimumLongStringLength(int length) {
+  private_->serializer.SetMinimumLongStringLength(length);
+}
+
 Maybe<bool> ValueSerializer::WriteValue(Local<Context> context,
                                         Local<Value> value) {
   PREPARE_FOR_EXECUTION_PRIMITIVE(context, ValueSerializer, WriteValue, bool);
   i::Handle<i::Object> object = Utils::OpenHandle(*value);
   Maybe<bool> result = private_->serializer.WriteObject(object);
   has_pending_exception = result.IsNothing();
   RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
   return result;
 }
 
@@ skipping 145 matching lines @@
                                              Utils::OpenHandle(*array_buffer));
 }
 
 void ValueDeserializer::TransferSharedArrayBuffer(
     uint32_t transfer_id, Local<SharedArrayBuffer> shared_array_buffer) {
   CHECK(!private_->has_aborted);
   private_->deserializer.TransferArrayBuffer(
       transfer_id, Utils::OpenHandle(*shared_array_buffer));
 }
 
+void ValueDeserializer::TransferLongString(uint32_t transfer_id,
+                                           Local<String> string) {
+  CHECK(!private_->has_aborted);
+  private_->deserializer.TransferLongString(transfer_id,
+                                            Utils::OpenHandle(*string));
+}
+
 bool ValueDeserializer::ReadUint32(uint32_t* value) {
   return private_->deserializer.ReadUint32(value);
 }
 
 bool ValueDeserializer::ReadUint64(uint64_t* value) {
   return private_->deserializer.ReadUint64(value);
 }
 
 bool ValueDeserializer::ReadDouble(double* value) {
   return private_->deserializer.ReadDouble(value);
@@ skipping 6949 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