Add d8 API for spawning function on a new thread.

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_
 
 #ifndef V8_SHARED
 #include "src/allocation.h"
 #include "src/hashmap.h"
+#include "src/list.h"
 #include "src/smart-pointers.h"
+#include "src/unbound-queue.h"

[Benedikt Meurer, 2015/06/19 05:00:12]

Don't use the UnboundedQueue. It's only purpose is to fullfil the needs of the
CPU profiler, which cannot use locking due to SuspendThread()/SIGPROF. Use a
normal mutex/semaphore guarded queue instead.

[binji, 2015/06/19 06:02:04]

Done. See fix in patch #3 here https://codereview.chromium.org/1195613003.

 #include "src/v8.h"
 #else
 #include "include/v8.h"
 #include "src/base/compiler-specific.h"
 #endif  // !V8_SHARED
 
 namespace v8 {
 
 
 #ifndef V8_SHARED
@@ skipping 138 matching lines @@
 #endif  // !V8_SHARED
 
   void ExitShell(int exit_code);
   Handle<String> ReadFile(Isolate* isolate, const char* name);
 
   const char** argv_;
   int begin_offset_;
   int end_offset_;
 };
 
+#ifndef V8_SHARED
+enum SerializationTag {
+  kSerializationTagUndefined,
+  kSerializationTagNull,
+  kSerializationTagTrue,
+  kSerializationTagFalse,
+  kSerializationTagNumber,
+  kSerializationTagString,
+  kSerializationTagArray,
+  kSerializationTagObject,
+  kSerializationTagArrayBuffer,
+  kSerializationTagTransferredArrayBuffer,
+  kSerializationTagTransferredSharedArrayBuffer,
+};
+
+
+class SerializationData {
+ public:
+  SerializationData() {}
+  ~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));
+  }
+
+  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;
+  }
+
+ private:
+  i::List<uint8_t> data;
+  i::List<ArrayBuffer::Contents> array_buffer_contents;
+  i::List<SharedArrayBuffer::Contents> shared_array_buffer_contents;
+};
+
+
+class Worker {
+ public:
+  Worker();
+  ~Worker();
+
+  void StartExecuteInThread(Isolate* isolate, const char* function_string);
+  void PostMessage(SerializationData* data);
+  SerializationData* GetMessage();
+  void Terminate();
+
+ private:
+  class WorkerThread : public base::Thread {
+   public:
+    explicit WorkerThread(Worker* worker)
+        : base::Thread(base::Thread::Options("WorkerThread")),
+          worker_(worker) {}
+
+    virtual void Run() { worker_->ExecuteInThread(); }
+
+   private:
+    Worker* worker_;
+  };
+
+  typedef i::UnboundQueue<SerializationData*> SerializationDataQueue;
+
+  void ExecuteInThread();
+  static void ClearQueue(SerializationDataQueue* queue);
+  void Cleanup();
+  static void PostMessageOut(const v8::FunctionCallbackInfo<v8::Value>& args);
+
+  base::Mutex mutex_;
+  base::Semaphore in_semaphore_;
+  base::Semaphore out_semaphore_;
+  SerializationDataQueue in_queue_;
+  SerializationDataQueue out_queue_;
+  base::Thread* thread_;
+  char* script_;
+};
+#endif  // !V8_SHARED
+
 
 class ShellOptions {
  public:
   ShellOptions()
       : script_executed(false),
         last_run(true),
         send_idle_notification(false),
         invoke_weak_callbacks(false),
         omit_quit(false),
         stress_opt(false),
@@ skipping 59 matching lines @@
   static void ReportException(Isolate* isolate, TryCatch* try_catch);
   static Handle<String> ReadFile(Isolate* isolate, const char* name);
   static Local<Context> CreateEvaluationContext(Isolate* isolate);
   static int RunMain(Isolate* isolate, int argc, char* argv[]);
   static int Main(int argc, char* argv[]);
   static void Exit(int exit_code);
   static void OnExit(Isolate* isolate);
   static void CollectGarbage(Isolate* isolate);
 
 #ifndef V8_SHARED
+  // TODO(binji): stupid implementation for now. Is there an easy way to hash an
+  // object for use in i::HashMap? By pointer?
+  typedef i::List<Handle<Object>> ObjectList;
+  static bool SerializeValue(Isolate* isolate, Handle<Value> value,
+                             const ObjectList& to_transfer,
+                             ObjectList* seen_objects,
+                             SerializationData* out_data);
+  static MaybeLocal<Value> DeserializeValue(Isolate* isolate,
+                                            const SerializationData& data,
+                                            int* offset);
+  static void CleanupWorkers();
   static Handle<Array> GetCompletions(Isolate* isolate,
                                       Handle<String> text,
                                       Handle<String> full);
   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);
@@ skipping 23 matching lines @@
   static void Write(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Quit(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Version(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Read(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void ReadBuffer(const v8::FunctionCallbackInfo<v8::Value>& args);
   static Handle<String> ReadFromStdin(Isolate* isolate);
   static void ReadLine(const v8::FunctionCallbackInfo<v8::Value>& args) {
     args.GetReturnValue().Set(ReadFromStdin(args.GetIsolate()));
   }
   static void Load(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void WorkerNew(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void WorkerPostMessage(
+      const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void WorkerGetMessage(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void WorkerTerminate(const v8::FunctionCallbackInfo<v8::Value>& args);
   // The OS object on the global object contains methods for performing
   // operating system calls:
   //
   // os.system("program_name", ["arg1", "arg2", ...], timeout1, timeout2) will
   // run the command, passing the arguments to the program.  The standard output
   // of the program will be picked up and returned as a multiline string.  If
   // timeout1 is present then it should be a number.  -1 indicates no timeout
   // and a positive number is used as a timeout in milliseconds that limits the
   // time spent waiting between receiving output characters from the program.
   // timeout2, if present, should be a number indicating the limit in
@@ skipping 19 matching lines @@
   static void UnsetEnvironment(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void SetUMask(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void MakeDirectory(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RemoveDirectory(const v8::FunctionCallbackInfo<v8::Value>& args);
 
   static void AddOSMethods(v8::Isolate* isolate,
                            Handle<ObjectTemplate> os_template);
 
   static const char* kPrompt;
   static ShellOptions options;
+  static ArrayBuffer::Allocator* array_buffer_allocator;
 
  private:
   static Persistent<Context> evaluation_context_;
 #ifndef V8_SHARED
   static Persistent<Context> utility_context_;
   static CounterMap* counter_map_;
   // We statically allocate a set of local counters to be used if we
   // 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::Mutex context_mutex_;
   static const base::TimeTicks kInitialTicks;
+  static Worker worker_;
+  static i::List<SharedArrayBuffer::Contents> externalized_shared_contents_;
 
   static Counter* GetCounter(const char* name, bool is_histogram);
   static void InstallUtilityScript(Isolate* isolate);
 #endif  // !V8_SHARED
   static void Initialize(Isolate* isolate);
   static void InitializeDebugger(Isolate* isolate);
   static void RunShell(Isolate* isolate);
   static bool SetOptions(int argc, char* argv[]);
   static Handle<ObjectTemplate> CreateGlobalTemplate(Isolate* isolate);
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_D8_H_