Debug: Allow stepping into on a given call frame.

src/runtime.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 12592 matching lines @@
   // Get the step action and check validity.
   StepAction step_action = static_cast<StepAction>(NumberToInt32(args[1]));
   if (step_action != StepIn &&
       step_action != StepNext &&
       step_action != StepOut &&
       step_action != StepInMin &&
       step_action != StepMin) {
     return isolate->Throw(isolate->heap()->illegal_argument_string());
   }
 
-  if (frame_id != StackFrame::NO_ID && step_action != StepNext &&
-      step_action != StepMin && step_action != StepOut) {
+  if (frame_id != StackFrame::NO_ID &&
+      step_action != StepIn &&
+      step_action != StepNext &&
+      step_action != StepOut &&
+      step_action != StepMin) {
     return isolate->ThrowIllegalOperation();
   }
 
   // Get the number of steps.
   int step_count = NumberToInt32(args[2]);
   if (step_count < 1) {
     return isolate->Throw(isolate->heap()->illegal_argument_string());
   }
 
   // Clear all current stepping setup.
@@ skipping 2181 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal