Implement strict mode arguments caller/callee.

src/heap.h

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 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
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 //
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@@ skipping 565 matching lines @@
   // Allocates a function initialized with a shared part.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
   MUST_USE_RESULT static MaybeObject* AllocateFunction(
       Map* function_map,
       SharedFunctionInfo* shared,
       Object* prototype,
       PretenureFlag pretenure = TENURED);
 
-  // Indicies for direct access into argument objects.
+  // Arguments object size.
   static const int kArgumentsObjectSize =
       JSObject::kHeaderSize + 2 * kPointerSize;
-  static const int arguments_callee_index = 0;
-  static const int arguments_length_index = 1;
+  // Strict mode arguments has no callee so it is smaller.
+  static const int kArgumentsObjectSizeStrict =
+      JSObject::kHeaderSize + 1 * kPointerSize;
+  // Indicies for direct access into argument objects.
+  static const int arguments_length_index = 0;
+  // callee is only valid in non-strict mode.
+  static const int arguments_callee_index = 1;
 

[Martin Maly, 2011/03/15 02:50:36]

The length and callee properties switch places in the in-object representation
of arguments. Only length is present always, callee only for non-strict mode
arguments.
calle for strict mode arguments is an accessor pair hanging off the map.

   // Allocates an arguments object - optionally with an elements array.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
   MUST_USE_RESULT static MaybeObject* AllocateArgumentsObject(Object* callee,
                                                               int length);
 
   // Same as NewNumberFromDouble, but may return a preallocated/immutable
   // number object (e.g., minus_zero_value_, nan_value_)
   MUST_USE_RESULT static MaybeObject* NumberFromDouble(
@@ skipping 1609 matching lines @@
   AssertNoAllocation no_alloc;  // i.e. no gc allowed.
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_