Debugger: use debug break slots to break at function exit.

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 10555 matching lines @@
   static const int kSize        = kTypesOffset + kPointerSize;
 };
 
 
 // The DebugInfo class holds additional information for a function being
 // debugged.
 class DebugInfo: public Struct {
  public:
   // The shared function info for the source being debugged.
   DECL_ACCESSORS(shared, SharedFunctionInfo)
-  // Code object for the original code.
-  DECL_ACCESSORS(original_code, Code)
   // Code object for the patched code. This code object is the code object
   // currently active for the function.
   DECL_ACCESSORS(code, Code)
   // Fixed array holding status information for each active break point.
   DECL_ACCESSORS(break_points, FixedArray)
 
   // Check if there is a break point at a code position.
   bool HasBreakPoint(int code_position);
   // Get the break point info object for a code position.
   Object* GetBreakPointInfo(int code_position);
@@ skipping 13 matching lines @@
   // Get the number of break points for this function.
   int GetBreakPointCount();
 
   DECLARE_CAST(DebugInfo)
 
   // Dispatched behavior.
   DECLARE_PRINTER(DebugInfo)
   DECLARE_VERIFIER(DebugInfo)
 
   static const int kSharedFunctionInfoIndex = Struct::kHeaderSize;
-  static const int kOriginalCodeIndex = kSharedFunctionInfoIndex + kPointerSize;
-  static const int kPatchedCodeIndex = kOriginalCodeIndex + kPointerSize;
-  static const int kActiveBreakPointsCountIndex =
-      kPatchedCodeIndex + kPointerSize;
-  static const int kBreakPointsStateIndex =
-      kActiveBreakPointsCountIndex + kPointerSize;
+  static const int kCodeIndex = kSharedFunctionInfoIndex + kPointerSize;
+  static const int kBreakPointsStateIndex = kCodeIndex + kPointerSize;
   static const int kSize = kBreakPointsStateIndex + kPointerSize;
 
   static const int kEstimatedNofBreakPointsInFunction = 16;
 
  private:
   static const int kNoBreakPointInfo = -1;
 
   // Lookup the index in the break_points array for a code position.
   int GetBreakPointInfoIndex(int code_position);
 
@@ skipping 181 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_