[debugger] tuned StepNext and StepOut at return position

src/debug/debug.h

 // Copyright 2012 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.
 
 #ifndef V8_DEBUG_DEBUG_H_
 #define V8_DEBUG_DEBUG_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/base/atomicops.h"
@@ skipping 472 matching lines @@
   // Find the closest source position for a break point for a given position.
   int FindBreakablePosition(Handle<DebugInfo> debug_info, int source_position,
                             BreakPositionAlignment alignment);
   // Instrument code to break at break points.
   void ApplyBreakPoints(Handle<DebugInfo> debug_info);
   // Clear code from instrumentation.
   void ClearBreakPoints(Handle<DebugInfo> debug_info);
   // Clear all code from instrumentation.
   void ClearAllBreakPoints();
   // Instrument a function with one-shots.
-  void FloodWithOneShot(Handle<SharedFunctionInfo> function);
+  void FloodWithOneShot(Handle<SharedFunctionInfo> function,
+                        bool returns_only = false);
   // Clear all one-shot instrumentations, but restore break points.
   void ClearOneShot();
 
   bool IsFrameBlackboxed(JavaScriptFrame* frame);
 
   void ActivateStepOut(StackFrame* frame);
   void RemoveDebugInfoAndClearFromShared(Handle<DebugInfo> debug_info);
   MaybeHandle<FixedArray> CheckBreakPoints(Handle<DebugInfo> debug_info,
                                            BreakLocation* location,
                                            bool* has_break_points = nullptr);
@@ skipping 54 matching lines @@
 
     // Current break id.
     int break_id_;
 
     // Frame id for the frame of the current break.
     StackFrame::Id break_frame_id_;
 
     // Step action for last step performed.
     StepAction last_step_action_;
 
+    // If set then this function will be ignored in PrepareStepIn call.

[dgozman, 2017/03/21 23:33:21]

If set, next PrepareStepIn will ignore this function until stepped into another
function, at which point this will be cleared.

[kozy, 2017/03/22 17:19:53]

Done.

+    Object* ignore_step_into_function_;
+
+    // If set then we need to repeat StepOut action at return.
+    bool fast_forward_to_return_;
+
     // Source statement position from last step next action.
     int last_statement_position_;
 
     // Frame pointer from last step next or step frame action.
     int last_frame_count_;
 
     // Frame pointer of the target frame we want to arrive at.
     int target_frame_count_;
 
     // Value of the accumulator at the point of entering the debugger.
@@ skipping 221 matching lines @@
                                   Handle<Code> code);
   static bool DebugBreakSlotIsPatched(Address pc);
   static void ClearDebugBreakSlot(Isolate* isolate, Address pc);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_DEBUG_DEBUG_H_