Call directly to c callbacks in Invoke instead of transitioning to js and back out.

src/builtins.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/v8.h"
 
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/base/once.h"
 #include "src/bootstrapper.h"
@@ skipping 1044 matching lines @@
   Object* holder = recv;
   if (!recv_type->IsUndefined()) {
     holder = FindHidden(heap, holder, FunctionTemplateInfo::cast(recv_type));
     if (holder == heap->null_value()) return heap->null_value();
   }
   return holder;
 }
 
 
 template <bool is_construct>
-MUST_USE_RESULT static Object* HandleApiCallHelper(
-    BuiltinArguments<NEEDS_CALLED_FUNCTION> args, Isolate* isolate) {
-  DCHECK(is_construct == CalledAsConstructor(isolate));
-  Heap* heap = isolate->heap();
-
+MUST_USE_RESULT static MaybeHandle<Object> HandleApiCallHelper(
+    Isolate* isolate, BuiltinArguments<NEEDS_CALLED_FUNCTION> args) {
   HandleScope scope(isolate);
   Handle<JSFunction> function = args.called_function();
   // TODO(ishell): turn this back to a DCHECK.
   CHECK(function->shared()->IsApiFunction());
 
   Handle<FunctionTemplateInfo> fun_data(
       function->shared()->get_api_func_data(), isolate);
   if (is_construct) {
-    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+    ASSIGN_RETURN_ON_EXCEPTION(
         isolate, fun_data,
         isolate->factory()->ConfigureInstance(
-            fun_data, Handle<JSObject>::cast(args.receiver())));
+            fun_data, Handle<JSObject>::cast(args.receiver())),
+        Object);
   }
 
   DCHECK(!args[0]->IsNull());
   if (args[0]->IsUndefined()) args[0] = function->global_proxy();
 
-  Object* raw_holder = TypeCheck(heap, args[0], *fun_data);
+  Object* raw_holder = TypeCheck(isolate->heap(), args[0], *fun_data);
 
   if (raw_holder->IsNull()) {
     // This function cannot be called with the given receiver.  Abort!
-    THROW_NEW_ERROR_RETURN_FAILURE(
-        isolate,
-        NewTypeError("illegal_invocation", HandleVector(&function, 1)));
+    THROW_NEW_ERROR(
+        isolate, NewTypeError("illegal_invocation", HandleVector(&function, 1)),
+        Object);
   }
 
   Object* raw_call_data = fun_data->call_code();
   if (!raw_call_data->IsUndefined()) {
     // TODO(ishell): remove this debugging code.
     CHECK(raw_call_data->IsCallHandlerInfo());
     CallHandlerInfo* call_data = CallHandlerInfo::cast(raw_call_data);
     Object* callback_obj = call_data->callback();
     v8::FunctionCallback callback =
         v8::ToCData<v8::FunctionCallback>(callback_obj);
     Object* data_obj = call_data->data();
-    Object* result;
 
     LOG(isolate, ApiObjectAccess("call", JSObject::cast(*args.receiver())));
     DCHECK(raw_holder->IsJSObject());
 
     FunctionCallbackArguments custom(isolate,
                                      data_obj,
                                      *function,
                                      raw_holder,
                                      &args[0] - 1,
                                      args.length() - 1,
                                      is_construct);
 
     v8::Handle<v8::Value> value = custom.Call(callback);
+    Handle<Object> result;
     if (value.IsEmpty()) {
-      result = heap->undefined_value();
+      result = isolate->factory()->undefined_value();
     } else {
-      result = *reinterpret_cast<Object**>(*value);
+      result = v8::Utils::OpenHandle(*value);
       result->VerifyApiCallResultType();
     }
 
-    RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
-    if (!is_construct || result->IsJSObject()) return result;
+    RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
+    if (!is_construct || result->IsJSObject()) {
+      return scope.CloseAndEscape(result);
+    }
   }
 
-  return *args.receiver();
+  return scope.CloseAndEscape(args.receiver());
 }
 
 
 BUILTIN(HandleApiCall) {
-  return HandleApiCallHelper<false>(args, isolate);
+  HandleScope scope(isolate);
+  DCHECK(!CalledAsConstructor(isolate));
+  Handle<Object> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
+                                     HandleApiCallHelper<false>(isolate, args));
+  return *result;
 }
 
 
 BUILTIN(HandleApiCallConstruct) {
-  return HandleApiCallHelper<true>(args, isolate);
+  HandleScope scope(isolate);
+  DCHECK(CalledAsConstructor(isolate));
+  Handle<Object> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
+                                     HandleApiCallHelper<true>(isolate, args));
+  return *result;
 }
 
 
+MaybeHandle<Object> Builtins::InvokeApiFunction(Handle<JSFunction> function,
+                                                Handle<Object> receiver,
+                                                int argc,
+                                                Handle<Object> args[]) {
+  // Construct BuiltinArguments object: function, arguments reversed, receiver.
+  const int kBufferSize = 32;
+  Object* small_argv[kBufferSize];
+  Object** argv;
+  if (argc + 2 <= kBufferSize) {
+    argv = small_argv;
+  } else {
+    argv = new Object* [argc + 2];
+  }
+  argv[argc + 1] = *receiver;
+  for (int i = 0; i < argc; ++i) {
+    argv[argc - i] = *args[i];
+  }
+  argv[0] = *function;
+  MaybeHandle<Object> result;
+  {
+    auto isolate = function->GetIsolate();
+    BuiltinArguments<NEEDS_CALLED_FUNCTION> arguments(argc + 2,
+                                                      &argv[argc + 1]);
+    result = HandleApiCallHelper<false>(isolate, arguments);
+  }
+  if (argv != small_argv) {
+    delete[] argv;
+  }
+  return result;
+}
+
+
 // Helper function to handle calls to non-function objects created through the
 // API. The object can be called as either a constructor (using new) or just as
 // a function (without new).
 MUST_USE_RESULT static Object* HandleApiCallAsFunctionOrConstructor(
     Isolate* isolate,
     bool is_construct_call,
     BuiltinArguments<NO_EXTRA_ARGUMENTS> args) {
   // Non-functions are never called as constructors. Even if this is an object
   // called as a constructor the delegate call is not a construct call.
   DCHECK(!CalledAsConstructor(isolate));
@@ skipping 462 matching lines @@
 }
 BUILTIN_LIST_C(DEFINE_BUILTIN_ACCESSOR_C)
 BUILTIN_LIST_A(DEFINE_BUILTIN_ACCESSOR_A)
 BUILTIN_LIST_H(DEFINE_BUILTIN_ACCESSOR_H)
 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
 #undef DEFINE_BUILTIN_ACCESSOR_C
 #undef DEFINE_BUILTIN_ACCESSOR_A
 
 
 } }  // namespace v8::internal