[d8] Use ValueSerializer for postMessage (instead of ad-hoc serializer)

src/d8.h

 // 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.
 
 #ifndef V8_D8_H_
 #define V8_D8_H_
 
 #include <string>
+#include <unordered_set>
 
 #include "src/allocation.h"
 #include "src/base/hashmap.h"
 #include "src/base/platform/time.h"
 #include "src/list.h"
 #include "src/utils.h"
 
 #include "src/base/once.h"
 
 
@@ skipping 117 matching lines @@
   base::Thread* thread_;
 
   void ExitShell(int exit_code);
   Local<String> ReadFile(Isolate* isolate, const char* name);
 
   const char** argv_;
   int begin_offset_;
   int end_offset_;
 };
 
-enum SerializationTag {
-  kSerializationTagUndefined,
-  kSerializationTagNull,
-  kSerializationTagTrue,
-  kSerializationTagFalse,
-  kSerializationTagNumber,
-  kSerializationTagString,
-  kSerializationTagArray,
-  kSerializationTagObject,
-  kSerializationTagArrayBuffer,
-  kSerializationTagTransferredArrayBuffer,
-  kSerializationTagTransferredSharedArrayBuffer,
-};
-
 
 class SerializationData {
  public:
-  SerializationData() {}
+  SerializationData() : data_(nullptr), size_(0) {}
   ~SerializationData();
 
-  void WriteTag(SerializationTag tag);
-  void WriteMemory(const void* p, int length);
-  void WriteArrayBufferContents(const ArrayBuffer::Contents& contents);
-  void WriteSharedArrayBufferContents(
-      const SharedArrayBuffer::Contents& contents);
-
-  template <typename T>
-  void Write(const T& data) {
-    WriteMemory(&data, sizeof(data));
+  uint8_t* data() { return data_; }
+  size_t size() { return size_; }
+  const std::vector<ArrayBuffer::Contents>& array_buffer_contents() {
+    return array_buffer_contents_;
+  }
+  const std::vector<SharedArrayBuffer::Contents>&
+  shared_array_buffer_contents() {
+    return shared_array_buffer_contents_;
   }
 
-  SerializationTag ReadTag(int* offset) const;
-  void ReadMemory(void* p, int length, int* offset) const;
-  void ReadArrayBufferContents(ArrayBuffer::Contents* contents,
-                               int* offset) const;
-  void ReadSharedArrayBufferContents(SharedArrayBuffer::Contents* contents,
-                                     int* offset) const;
-
-  template <typename T>
-  T Read(int* offset) const {
-    T value;
-    ReadMemory(&value, sizeof(value), offset);
-    return value;
-  }
+  void ClearTransferredArrayBuffers();
 
  private:
-  i::List<uint8_t> data_;
-  i::List<ArrayBuffer::Contents> array_buffer_contents_;
-  i::List<SharedArrayBuffer::Contents> shared_array_buffer_contents_;
+  uint8_t* data_;

[jbroman, 2017/01/24 18:53:43]

This looks like it's leaked. You could use unique_ptr, vector, or at a bare
minimum freeing this in the SerializationData destructor.

[binji, 2017/01/25 00:31:36]

Done.

+  size_t size_;
+  std::vector<ArrayBuffer::Contents> array_buffer_contents_;
+  std::vector<SharedArrayBuffer::Contents> shared_array_buffer_contents_;
+
+ private:
+  friend class Serializer;
+
+  DISALLOW_COPY_AND_ASSIGN(SerializationData);
 };
 
 
 class SerializationDataQueue {
  public:
   void Enqueue(SerializationData* data);
   bool Dequeue(SerializationData** data);
   bool IsEmpty();
   void Clear();
 
@@ skipping 123 matching lines @@
   static void ReportException(Isolate* isolate, TryCatch* try_catch);
   static Local<String> ReadFile(Isolate* isolate, const char* name);
   static Local<Context> CreateEvaluationContext(Isolate* isolate);
   static int RunMain(Isolate* isolate, int argc, char* argv[], bool last_run);
   static int Main(int argc, char* argv[]);
   static void Exit(int exit_code);
   static void OnExit(Isolate* isolate);
   static void CollectGarbage(Isolate* isolate);
   static void EmptyMessageQueues(Isolate* isolate);
 
-  // TODO(binji): stupid implementation for now. Is there an easy way to hash an
-  // object for use in base::HashMap? By pointer?
-  typedef i::List<Local<Object>> ObjectList;
-  static bool SerializeValue(Isolate* isolate, Local<Value> value,
-                             const ObjectList& to_transfer,
-                             ObjectList* seen_objects,
-                             SerializationData* out_data);
+  static Maybe<SerializationData*> SerializeValue(Isolate* isolate,
+                                                  Local<Value> value,
+                                                  Local<Value> transfer);
   static MaybeLocal<Value> DeserializeValue(Isolate* isolate,
-                                            const SerializationData& data,
-                                            int* offset);
+                                            SerializationData* data);
   static void CleanupWorkers();
   static int* LookupCounter(const char* name);
   static void* CreateHistogram(const char* name,
                                int min,
                                int max,
                                size_t buckets);
   static void AddHistogramSample(void* histogram, int sample);
   static void MapCounters(v8::Isolate* isolate, const char* name);
 
   static void PerformanceNow(const v8::FunctionCallbackInfo<v8::Value>& args);
@@ skipping 81 matching lines @@
   // don't want to store the stats in a memory-mapped file
   static CounterCollection local_counters_;
   static CounterCollection* counters_;
   static base::OS::MemoryMappedFile* counters_file_;
   static base::LazyMutex context_mutex_;
   static const base::TimeTicks kInitialTicks;
 
   static base::LazyMutex workers_mutex_;
   static bool allow_new_workers_;
   static i::List<Worker*> workers_;
-  static i::List<SharedArrayBuffer::Contents> externalized_shared_contents_;
+  static std::unordered_set<SharedArrayBuffer::Contents>
+      externalized_shared_contents_;
 
   static void WriteIgnitionDispatchCountersFile(v8::Isolate* isolate);
   static Counter* GetCounter(const char* name, bool is_histogram);
   static Local<String> Stringify(Isolate* isolate, Local<Value> value);
   static void Initialize(Isolate* isolate);
   static void RunShell(Isolate* isolate);
   static bool SetOptions(int argc, char* argv[]);
   static Local<ObjectTemplate> CreateGlobalTemplate(Isolate* isolate);
   static MaybeLocal<Context> CreateRealm(
       const v8::FunctionCallbackInfo<v8::Value>& args);
   static MaybeLocal<Module> FetchModuleTree(v8::Local<v8::Context> context,
                                             const std::string& file_name);
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_D8_H_