Introduce bytecodes for assisting generator suspend and resume.

src/runtime/runtime-generator.cc

 // Copyright 2014 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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/factory.h"
 #include "src/frames-inl.h"
 #include "src/objects-inl.h"
@@ skipping 127 matching lines @@
   if (generator->is_suspended()) {
     Handle<Code> code(generator->function()->code(), isolate);
     int offset = generator->continuation();
     RUNTIME_ASSERT(0 <= offset && offset < code->instruction_size());
     return Smi::FromInt(code->SourcePosition(offset));
   }
 
   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