[debugger] fix stepping over await calls for ignition generators.

src/interpreter/interpreter-assembler.cc

 // Copyright 2015 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/interpreter/interpreter-assembler.h"
 
 #include <limits>
 #include <ostream>
 
 #include "src/code-factory.h"
@@ skipping 602 matching lines @@
 }
 
 Node* InterpreterAssembler::StackCheckTriggeredInterrupt() {
   Node* sp = LoadStackPointer();
   Node* stack_limit = Load(
       MachineType::Pointer(),
       ExternalConstant(ExternalReference::address_of_stack_limit(isolate())));
   return UintPtrLessThan(sp, stack_limit);
 }
 
+Node* InterpreterAssembler::DebugSteppingAcrossAwait() {

[rmcilroy, 2016/06/14 10:00:22]

This is no longer a generic operation that might be useful elsewhere, so I don't
think it makes sense to live in InterpreterAssembler any longer. Could you move
it to where it is used in SuspendGenerators please.

[Yang, 2016/06/14 11:19:44]

Done.

+  Node* step_action =
+      Load(MachineType::Int8(),
+           ExternalConstant(
+               ExternalReference::debug_last_step_action_address(isolate())));
+  STATIC_ASSERT(StepIn > StepNext);
+  STATIC_ASSERT(StepFrame > StepNext);

[rmcilroy, 2016/06/14 10:00:22]

Could you assert that StepFrame is the last element in the enum as well?

[Yang, 2016/06/14 11:19:44]

Done.

+  Node* step_next = Int32Constant(StepNext);
+  return Int32LessThanOrEqual(step_next, step_action);
+}
+
 void InterpreterAssembler::Abort(BailoutReason bailout_reason) {
   disable_stack_check_across_call_ = true;
   Node* abort_id = SmiTag(Int32Constant(bailout_reason));
   CallRuntime(Runtime::kAbort, GetContext(), abort_id);
   disable_stack_check_across_call_ = false;
 }
 
 void InterpreterAssembler::AbortIfWordNotEqual(Node* lhs, Node* rhs,
                                                BailoutReason bailout_reason) {
   Label ok(this), abort(this, Label::kDeferred);
@@ skipping 128 matching lines @@
     Goto(&loop);
   }
   Bind(&done_loop);
 
   return array;
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8