Remove some unnecessary binding initialization checks.

src/objects.h

 // Copyright 2011 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 3155 matching lines @@
 
   // Return the name of the given stack local.
   Handle<String> stack_local_name(int var);
 
   // Return the name of the given context local.
   Handle<String> context_local_name(int var);
 
   // Return the mode of the given context local.
   VariableMode context_local_mode(int var);
 
+  // Return the initialization flag of the given context local.
+  InitializationFlag context_local_init_flag(int var);
+
   // Lookup support for serialized scope info. Returns the
   // the stack slot index for a given slot name if the slot is
   // present; otherwise returns a value < 0. The name must be a symbol
   // (canonicalized).
   int StackSlotIndex(String* name);
 
-  // Lookup support for serialized scope info. Returns the
-  // context slot index for a given slot name if the slot is present; otherwise
-  // returns a value < 0. The name must be a symbol (canonicalized).
-  // If the slot is present and mode != NULL, sets *mode to the corresponding
-  // mode for that variable.
-  int ContextSlotIndex(String* name, VariableMode* mode = NULL);
+  // Lookup support for serialized scope info. Returns the context slot index
+  // for a given slot name if the slot is present; otherwise returns a
+  // value < 0. The name must be a symbol (canonicalized).
+  // If the slot is present
+  //  1. and mode != NULL, sets *mode to the mode of that variable.
+  //  2. and init_flag != NULL, sets *init_flag to the initialization flag of
+  //     that variable.
+  int ContextSlotIndex(String* name,
+                       VariableMode* mode = NULL,
+                       InitializationFlag* init_flag = NULL);
 
   // Lookup support for serialized scope info. Returns the
   // parameter index for a given parameter name if the parameter is present;
   // otherwise returns a value < 0. The name must be a symbol (canonicalized).
   int ParameterIndex(String* name);
 
   // Lookup support for serialized scope info. Returns the
   // function context slot index if the function name is present (named
   // function expressions, only), otherwise returns a value < 0. The name
   // must be a symbol (canonicalized).
@@ skipping 52 matching lines @@
   //    Contains the names of local variables that are allocated on the stack,
   //    in increasing order of the stack slot index. One slot is used per
   //    stack local, so in total this part occupies num_stack_locals() slots
   //    in the array.
   // 3. ContextLocalNameEntries:
   //    Contains the names of local variables and parameters that are allocated
   //    in the context. They are stored in increasing order of the context slot
   //    index starting with Context::MIN_CONTEXT_SLOTS. One slot is used per
   //    context local, so in total this part occupies num_context_locals()
   //    slots in the array.
-  // 4. ContextLocalModeEntries:
-  //    Contains the variable modes corresponding to the context locals in
-  //    ContextLocalNameEntries. One slot is used per context local, so in total
-  //    this part occupies num_context_locals() slots in the array.
+  // 4. ContextLocalInfoEntries:
+  //    Contains the variable modes and initialization flags corresponding to
+  //    the context locals in ContextLocalNameEntries. One slot is used per
+  //    context local, so in total this part occupies num_context_locals()
+  //    slots in the array.
   // 5. FunctionNameEntryIndex:
   //    If the scope belongs to a named function expression this part contains
   //    information about the function variable. It always occupies two array
   //    slots:  a. The name of the function variable.
   //            b. The context or stack slot index for the variable.
   int ParameterEntriesIndex();
   int StackLocalEntriesIndex();
   int ContextLocalNameEntriesIndex();
-  int ContextLocalModeEntriesIndex();
+  int ContextLocalInfoEntriesIndex();
   int FunctionNameEntryIndex();
 
   // Location of the function variable for named function expressions.
   enum FunctionVariableInfo {
     NONE,     // No function name present.
     STACK,    // Function
     CONTEXT,
     UNUSED
   };
 
   // Properties of scopes.
   class TypeField:             public BitField<ScopeType,            0, 3> {};
   class CallsEvalField:        public BitField<bool,                 3, 1> {};
   class StrictModeField:       public BitField<bool,                 4, 1> {};
   class FunctionVariableField: public BitField<FunctionVariableInfo, 5, 2> {};
   class FunctionVariableMode:  public BitField<VariableMode,         7, 3> {};
+
+  // BitFields representing the encoded information for context locals in the
+  // ContextLocalInfoEntries part.
+  class ContextLocalMode:      public BitField<VariableMode,         0, 3> {};
+  class ContextLocalInitFlag:  public BitField<InitializationFlag,   3, 1> {};
 };
 
 
 // The cache for maps used by normalized (dictionary mode) objects.
 // Such maps do not have property descriptors, so a typical program
 // needs very limited number of distinct normalized maps.
 class NormalizedMapCache: public FixedArray {
  public:
   static const int kEntries = 64;
 
@@ skipping 4630 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_