[generators] Implement %GeneratorGetSourcePosition.

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/debug/debug.h"
 #include "src/factory.h"
 #include "src/frames-inl.h"
@@ skipping 22 matching lines @@
   Handle<JSGeneratorObject> generator =
       isolate->factory()->NewJSGeneratorObject(function);
   generator->set_function(*function);
   generator->set_context(isolate->context());
   generator->set_receiver(*receiver);
   generator->set_operand_stack(*operand_stack);
   generator->set_continuation(JSGeneratorObject::kGeneratorExecuting);
   return *generator;
 }
 
-
 RUNTIME_FUNCTION(Runtime_SuspendJSGeneratorObject) {
   HandleScope handle_scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator_object, 0);
 
   JavaScriptFrameIterator stack_iterator(isolate);
   JavaScriptFrame* frame = stack_iterator.frame();
   CHECK(frame->function()->shared()->is_resumable());
   DCHECK_EQ(frame->function(), generator_object->function());
   DCHECK(frame->function()->shared()->is_compiled());
@@ skipping 30 matching lines @@
 RUNTIME_FUNCTION(Runtime_GeneratorClose) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
 
   generator->set_continuation(JSGeneratorObject::kGeneratorClosed);
 
   return isolate->heap()->undefined_value();
 }
 
-
-// Returns function of generator activation.
 RUNTIME_FUNCTION(Runtime_GeneratorGetFunction) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
 
   return generator->function();
 }
 
-
-// Returns receiver of generator activation.
 RUNTIME_FUNCTION(Runtime_GeneratorGetReceiver) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
 
   return generator->receiver();
 }
 
-
-// Returns input of generator activation.
-RUNTIME_FUNCTION(Runtime_GeneratorGetInput) {
+RUNTIME_FUNCTION(Runtime_GeneratorGetInputOrDebugPos) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
 
-  return generator->input();
+  return generator->input_or_debug_pos();
 }
 
-// Returns resume mode of generator activation.
 RUNTIME_FUNCTION(Runtime_GeneratorGetResumeMode) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
 
   return Smi::FromInt(generator->resume_mode());
 }
 
-
 RUNTIME_FUNCTION(Runtime_GeneratorGetContinuation) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
 
   return Smi::FromInt(generator->continuation());
 }
 
-
 RUNTIME_FUNCTION(Runtime_GeneratorGetSourcePosition) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
 
   if (!generator->is_suspended()) return isolate->heap()->undefined_value();
-
-  if (generator->function()->shared()->HasBytecodeArray()) UNIMPLEMENTED();
-
-  Handle<Code> code(generator->function()->code(), isolate);
-  int offset = generator->continuation();
-  CHECK(0 <= offset && offset < code->instruction_size());
-  return Smi::FromInt(code->SourcePosition(offset));
+  return Smi::FromInt(generator->source_position());
 }
 
 }  // namespace internal
 }  // namespace v8