Inform V8 of external allocations.

This is sloppy: after each ObjectWrap allocation the user needs to
call ObjectWrap::InformV8ofAllocation(). In addition each class deriving
from  ObjectWrap needs to implement the virtual method size() which should
return the size of the derived class. If I was better at C++ I could
possibly make this less ugly. For now this is how it is.

Memory usage looks much better after this commit.

configure

@@ -95,7 +95,7 @@ uninstall:
 test: all
 	@for i in test/test*.js; do \\
 		echo "\$\$i: "; \\
-		build/default/node \$\$i && echo PASS || echo FAIL; \\
+		build/debug/node \$\$i && echo PASS || echo FAIL; \\
 	done 
 
 clean:

src/file.cc

@@ -487,7 +487,10 @@ Handle<Value>
 File::New(const Arguments& args)
 {
   HandleScope scope;
-  new File(args.Holder());
+
+  File *f = new File(args.Holder());
+  ObjectWrap::InformV8ofAllocation(f);
+
   return args.This();
 }
 

src/file.h

@@ -20,6 +20,8 @@ class File : ObjectWrap {
 public:
   static void Initialize (v8::Handle<v8::Object> target);
 
+  virtual size_t size (void) { return sizeof(File); } 
+
 protected:
   File (v8::Handle<v8::Object> handle);
   ~File ();

src/http.cc

@@ -43,7 +43,7 @@ HTTPConnection::Initialize (Handle<Object> target)
   client_constructor_template = Persistent<FunctionTemplate>::New(t);
   client_constructor_template->Inherit(Connection::constructor_template);
   client_constructor_template->InstanceTemplate()->SetInternalFieldCount(1);
-  target->Set(String::NewSymbol("Client"), client_constructor_template->GetFunction());
+  target->Set(String::NewSymbol("LowLevelClient"), client_constructor_template->GetFunction());
 
   t = FunctionTemplate::New(v8NewServer);
   server_constructor_template = Persistent<FunctionTemplate>::New(t);
@@ -57,15 +57,21 @@ Handle<Value>
 HTTPConnection::v8NewClient (const Arguments& args)
 {
   HandleScope scope;
-  new HTTPConnection(args.This(), HTTP_RESPONSE);
+
+  HTTPConnection *connection = new HTTPConnection(args.This(), HTTP_RESPONSE);
+  ObjectWrap::InformV8ofAllocation(connection);
+
   return args.This();
 }
 
 Handle<Value>
 HTTPConnection::v8NewServer (const Arguments& args)
 {
   HandleScope scope;
-  new HTTPConnection(args.This(), HTTP_REQUEST);
+
+  HTTPConnection *connection = new HTTPConnection(args.This(), HTTP_REQUEST);
+  ObjectWrap::InformV8ofAllocation(connection);
+
   return args.This();
 }
 
@@ -281,6 +287,13 @@ HTTPConnection::HTTPConnection (Handle<Object> handle, enum http_parser_type typ
   parser_.data = this;
 }
 
+
+HTTPConnection::~HTTPConnection ( )
+{
+  V8::AdjustAmountOfExternalAllocatedMemory(-sizeof(HTTPConnection));
+}
+
+
 Persistent<FunctionTemplate> HTTPServer::constructor_template;
 
 void
@@ -312,7 +325,8 @@ HTTPServer::v8New (const Arguments& args)
     options = Object::New();
   }
 
-  new HTTPServer(args.This(), protocol_class, options);
+  HTTPServer *s = new HTTPServer(args.This(), protocol_class, options);
+  ObjectWrap::InformV8ofAllocation(s);
 
   return args.This();
 }

src/http.h

@@ -20,6 +20,7 @@ class HTTPConnection : public Connection {
 
   HTTPConnection (v8::Handle<v8::Object> handle, 
                   enum http_parser_type type);
+  ~HTTPConnection ( );
 
   void OnReceive (const void *buf, size_t len);
 
@@ -47,6 +48,7 @@ class HTTPServer : public Acceptor {
 protected:
   static v8::Handle<v8::Value> v8New (const v8::Arguments& args);
 
+
   HTTPServer (v8::Handle<v8::Object> handle, 
               v8::Handle<v8::Function> protocol_class, 
               v8::Handle<v8::Object> options)

src/net.cc

@@ -145,7 +145,10 @@ Handle<Value>
 Connection::v8New (const Arguments& args)
 {
   HandleScope scope;
-  new Connection(args.This());
+
+  Connection *c = new Connection(args.This());
+  ObjectWrap::InformV8ofAllocation(c);
+
   return args.This();
 }
 
@@ -274,6 +277,16 @@ Connection::v8Send (const Arguments& args)
   Connection *connection = NODE_UNWRAP(Connection, args.Holder());
   if (!connection) return Handle<Value>();
 
+  // XXX
+  // A lot of improvement can be made here. First of all we're allocating
+  // oi_bufs for every send which is clearly inefficent - it should use a
+  // memory pool or ring buffer.  In either case, v8 needs to be informed
+  // about our allocations deallocations via
+  // V8::AdjustAmountOfExternalAllocatedMemory to give the GC hints about
+  // what we're doing here.  Of course, expressing binary data as an array
+  // of integers is extremely inefficent. This can improved when v8 bug 270
+  // (http://code.google.com/p/v8/issues/detail?id=270) has been addressed. 
+
   if (args[0]->IsString()) {
     // utf8 encoding
     Local<String> s = args[0]->ToString();
@@ -451,7 +464,8 @@ Acceptor::v8New (const Arguments& args)
     options = Object::New();
   }
 
-  new Acceptor(args.This(), connection_handler, options);
+  Acceptor *a = new Acceptor(args.This(), connection_handler, options);
+  ObjectWrap::InformV8ofAllocation(a);
 
   return args.This();
 }

src/net.h

@@ -13,6 +13,8 @@ class Connection : public ObjectWrap {
 public:
   static void Initialize (v8::Handle<v8::Object> target);
 
+  virtual size_t size (void) { return sizeof(Connection); };
+
 protected:
   /* v8 interface */
   static v8::Persistent<v8::FunctionTemplate> constructor_template;
@@ -100,6 +102,8 @@ class Acceptor : public ObjectWrap {
 public:
   static void Initialize (v8::Handle<v8::Object> target);
 
+  virtual size_t size (void) { return sizeof(Acceptor); };
+
 protected:
   static v8::Persistent<v8::FunctionTemplate> constructor_template;
   static v8::Handle<v8::Value> v8New (const v8::Arguments& args);
@@ -109,7 +113,7 @@ class Acceptor : public ObjectWrap {
   Acceptor (v8::Handle<v8::Object> handle, 
             v8::Handle<v8::Function> connection_handler, 
             v8::Handle<v8::Object> options);
-  virtual ~Acceptor () { Close(); puts("acceptor gc'd!");}
+  virtual ~Acceptor () { Close(); }
 
   v8::Local<v8::Function> GetConnectionHandler (void);
 

src/node.cc

@@ -53,8 +53,10 @@ ObjectWrap::Detach ()
   if (attach_count_ > 0)
     attach_count_ -= 1;
 
-  if(weak_ && attach_count_ == 0)
+  if(weak_ && attach_count_ == 0) {
+    V8::AdjustAmountOfExternalAllocatedMemory(-size());
     delete this;
+  }
 }
 
 void*
@@ -87,6 +89,12 @@ ObjectWrap::MakeWeak (Persistent<Value> _, void *data)
     delete obj;
 }
 
+void
+ObjectWrap::InformV8ofAllocation (ObjectWrap *obj)
+{
+  v8::V8::AdjustAmountOfExternalAllocatedMemory(obj->size());
+}
+
 // Extracts a C string from a V8 Utf8Value.
 const char*
 ToCString(const v8::String::Utf8Value& value)
@@ -244,6 +252,7 @@ main (int argc, char *argv[])
   ev_async_init(&eio_watcher, node_eio_cb);
   eio_init(eio_want_poll, NULL);
 
+  V8::Initialize();
   V8::SetFlagsFromCommandLine(&argc, argv, true);
 
   if(argc < 2)  {

src/node.h

@@ -30,6 +30,11 @@ class ObjectWrap {
   ObjectWrap (v8::Handle<v8::Object> handle);
   virtual ~ObjectWrap ( );
 
+  virtual size_t size (void) = 0;
+
+  /* This must be called after each new ObjectWrap creation! */
+  static void InformV8ofAllocation (node::ObjectWrap *obj);
+
 protected:
   static void* Unwrap (v8::Handle<v8::Object> handle);
   v8::Persistent<v8::Object> handle_;

src/timer.cc

@@ -80,7 +80,8 @@ Timer::New (const Arguments& args)
   ev_tstamp after = (double)(args[1]->IntegerValue())  / 1000.0;
   ev_tstamp repeat = (double)(args[2]->IntegerValue())  / 1000.0;
 
-  new Timer(args.Holder(), callback, after, repeat);
+  Timer *t = new Timer(args.Holder(), callback, after, repeat);
+  ObjectWrap::InformV8ofAllocation(t);
 
   return args.This();
 }

src/timer.h

@@ -11,6 +11,8 @@ class Timer : ObjectWrap {
  public:
   static void Initialize (v8::Handle<v8::Object> target);
 
+  virtual size_t size (void) { return sizeof(Timer); }
+
  protected:
   static v8::Persistent<v8::FunctionTemplate> constructor_template;
 

test_http.js

@@ -1,8 +1,7 @@
-p({hello: "world"});
 new node.http.Server(function (msg) {
-//  setTimeout(function () {
+  setTimeout(function () {
     msg.sendHeader(200, [["Content-Type", "text/plain"]]);
     msg.sendBody("Hello World");
     msg.finish();
-//  }, 1);
+  }, 1000);
 }).listen(8000, "localhost");