Add name inference for anonymous functions to facilitate debugging and profiling of JS code.

src/objects.h

 // Copyright 2006-2008 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 2647 matching lines @@
   // position, whether or not the function is a function expression,
   // and whether or not the function is a toplevel function. The two
   // least significants bit indicates whether the function is an
   // expression and the rest contains the source code position.
   inline int start_position_and_type();
   inline void set_start_position_and_type(int value);
 
   // [debug info]: Debug information.
   DECL_ACCESSORS(debug_info, Object)
 
+  // [inferred name]: Name inferred from variable or property
+  // assignment of this function. Used to facilitate debugging and
+  // profiling of JavaScript code written in OO style, where almost
+  // all functions are anonymous but are assigned to object
+  // properties.
+  DECL_ACCESSORS(inferred_name, String)
+
   // Position of the 'function' token in the script source.
   inline int function_token_position();
   inline void set_function_token_position(int function_token_position);
 
   // Position of this function in the script source.
   inline int start_position();
   inline void set_start_position(int start_position);
 
   // End position of this function in the script source.
   inline int end_position();
@@ skipping 39 matching lines @@
       kExpectedNofPropertiesOffset + kIntSize;
   static const int kExternalReferenceDataOffset =
       kInstanceClassNameOffset + kPointerSize;
   static const int kLazyLoadDataOffset =
       kExternalReferenceDataOffset + kPointerSize;
   static const int kScriptOffset = kLazyLoadDataOffset + kPointerSize;
   static const int kStartPositionAndTypeOffset = kScriptOffset + kPointerSize;
   static const int kEndPositionOffset = kStartPositionAndTypeOffset + kIntSize;
   static const int kFunctionTokenPositionOffset = kEndPositionOffset + kIntSize;
   static const int kDebugInfoOffset = kFunctionTokenPositionOffset + kIntSize;
-  static const int kSize = kDebugInfoOffset + kPointerSize;
+  static const int kInferredNameOffset = kDebugInfoOffset + kPointerSize;
+  static const int kSize = kInferredNameOffset + kPointerSize;
 
  private:
   // Bit positions in length_and_flg.
   // The least significant bit is used as the flag.
   static const int kFlagBit         = 0;
   static const int kLengthShift     = 1;
   static const int kLengthMask      = ~((1 << kLengthShift) - 1);
 
   // Bit positions in start_position_and_type.
   // The source code start position is in the 30 most significant bits of
@@ skipping 1569 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_