- Optimized copying of FixedArray.

src/heap.h

Index: src/heap.h
===================================================================
--- src/heap.h	(revision 523)
+++ src/heap.h	(working copy)
@@ -379,9 +379,13 @@
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  static Object* AllocateFixedArray(int length,
-                                    PretenureFlag pretenure = NOT_TENURED);
+  static Object* AllocateFixedArray(int length, PretenureFlag pretenure);
+  // As above but specialized for pretenure == NON_TENURE.
+  static Object* AllocateFixedArray(int length);
 
+  // Make a copy of src and return it. Returns
+  // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
+  static Object* CopyFixedArray(FixedArray* src);
 
   // Allocates a fixed array initialized with the hole values.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
@@ -814,6 +818,8 @@
   // (since both AllocateRaw and AllocateRawMap are inlined).
   static inline Object* AllocateRawMap(int size_in_bytes);
 
+  // Allocate unitialized fixed array (pretenure == NON_TENURE).

[Kasper Lund, 2008/10/20 06:31:07]

Why not write the comment as: Allocate uninitialized, non-tenured fixed array?

+  static Object* AllocateRawFixedArray(int length);
 
   // Initializes a JSObject based on its map.
   static void InitializeJSObjectFromMap(JSObject* obj,