Group lexical context variables for faster look up.

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 3923 matching lines @@
   // 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 an internalized string.
   // If the slot is present and mode != NULL, sets *mode to the corresponding
   // mode for that variable.
   static int ContextSlotIndex(Handle<ScopeInfo> scope_info, Handle<String> name,
                               VariableMode* mode, VariableLocation* location,
                               InitializationFlag* init_flag,
                               MaybeAssignedFlag* maybe_assigned_flag);
 
+  static int LexicalContextSlotIndex(Handle<ScopeInfo> scope_info,
+                                     Handle<String> name);
+
   // Lookup the name of a certain context slot by its index.
   String* ContextSlotName(int slot_index);
 
   // 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 an internalized string.
   int ParameterIndex(String* name);
 
   // Lookup support for serialized scope info. Returns the function context
   // slot index if the function name is present and context-allocated (named
@@ skipping 24 matching lines @@
   // 2. The number of parameters. This only applies to function scopes. For
   //    non-function scopes this is 0.
   // 3. The number of non-parameter variables allocated on the stack.
   // 4. The number of non-parameter and parameter variables allocated in the
   //    context.
 #define FOR_EACH_NUMERIC_FIELD(V) \
   V(Flags)                        \
   V(ParameterCount)               \
   V(StackLocalCount)              \
   V(ContextLocalCount)            \
+  V(LexicalContextLocalCount)     \
   V(ContextGlobalCount)           \
   V(StrongModeFreeVariableCount)
 
 #define FIELD_ACCESSORS(name)                            \
   void Set##name(int value) {                            \
     set(k##name, Smi::FromInt(value));                   \
   }                                                      \
   int name() {                                           \
     if (length() > 0) {                                  \
       return Smi::cast(get(k##name))->value();           \
@@ skipping 6547 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_