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

src/interpreter/interpreter-assembler.cc

Index: src/interpreter/interpreter-assembler.cc
diff --git a/src/interpreter/interpreter-assembler.cc b/src/interpreter/interpreter-assembler.cc
index d878c5c69370b4904e5963b81e6487f34d7a3ae7..9cd3b1902018ac4f12b62417f62c82fb01a5fc2d 100644
--- a/src/interpreter/interpreter-assembler.cc
+++ b/src/interpreter/interpreter-assembler.cc
@@ -620,6 +620,17 @@ Node* InterpreterAssembler::StackCheckTriggeredInterrupt() {
   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));