Introduce bytecodes for assisting generator suspend and resume.

src/runtime/runtime-generator.cc

Index: src/runtime/runtime-generator.cc
diff --git a/src/runtime/runtime-generator.cc b/src/runtime/runtime-generator.cc
index 9c875300c6ba1aaf3d2fc90564f32d65bffaf2ef..602b2c66cccbc0e21972a31baa09d8b482b2dc61 100644
--- a/src/runtime/runtime-generator.cc
+++ b/src/runtime/runtime-generator.cc
@@ -145,60 +145,5 @@ RUNTIME_FUNCTION(Runtime_GeneratorGetSourcePosition) {
   return isolate->heap()->undefined_value();
 }
 
-
-RUNTIME_FUNCTION(Runtime_SuspendIgnitionGenerator) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Smi, state, 1);
-
-  JavaScriptFrameIterator it(isolate);
-  JavaScriptFrame* frame = it.frame();
-  Handle<JSFunction> function(frame->function());
-  CHECK(function->shared()->is_generator());
-  CHECK_EQ(frame->type(), StackFrame::INTERPRETED);
-
-  // Save register file.
-  int size = function->shared()->bytecode_array()->register_count();
-  Handle<FixedArray> register_file = isolate->factory()->NewFixedArray(size);
-  for (int i = 0; i < size; ++i) {
-    Object* value =
-        static_cast<InterpretedFrame*>(frame)->ReadInterpreterRegister(i);
-    register_file->set(i, value);
-  }
-
-  generator->set_operand_stack(*register_file);
-  generator->set_context(Context::cast(frame->context()));
-  generator->set_continuation(state->value());
-
-  return isolate->heap()->undefined_value();
-}
-
-
-RUNTIME_FUNCTION(Runtime_ResumeIgnitionGenerator) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
-
-  JavaScriptFrameIterator it(isolate);
-  JavaScriptFrame* frame = it.frame();
-  Handle<JSFunction> function(frame->function());
-  CHECK(function->shared()->is_generator());
-  CHECK_EQ(frame->type(), StackFrame::INTERPRETED);
-
-  // Restore register file.
-  int size = function->shared()->bytecode_array()->register_count();
-  DCHECK_EQ(size, generator->operand_stack()->length());
-  for (int i = 0; i < size; ++i) {
-    Object* value = generator->operand_stack()->get(i);
-    static_cast<InterpretedFrame*>(frame)->WriteInterpreterRegister(i, value);
-  }
-  generator->set_operand_stack(isolate->heap()->empty_fixed_array());
-
-  int state = generator->continuation();
-  generator->set_continuation(JSGeneratorObject::kGeneratorExecuting);
-  return Smi::FromInt(state);
-}
-
 }  // namespace internal
 }  // namespace v8