Store transitioned JSArray maps in global context

src/heap.h

 // Copyright 2012 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 413 matching lines @@
   // separate from old space strings.
   List<Object*> new_space_strings_;
   List<Object*> old_space_strings_;
 
   Heap* heap_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalStringTable);
 };
 
 
+enum ArrayStorageAllocationMode {
+  DONT_INITIALIZE_ARRAY_ELEMENTS,
+  INITIALIZE_ARRAY_ELEMENTS_WITH_HOLE
+};
+
 class Heap {
  public:
   // Configure heap size before setup. Return false if the heap has been
   // set up already.
   bool ConfigureHeap(int max_semispace_size,
                      intptr_t max_old_gen_size,
                      intptr_t max_executable_size);
   bool ConfigureHeapDefault();
 
   // Initializes the global object heap. If create_heap_objects is true,
@@ skipping 81 matching lines @@
   bool UncommitFromSpace() { return new_space_.UncommitFromSpace(); }
 
   // Allocates and initializes a new JavaScript object based on a
   // constructor.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
   MUST_USE_RESULT MaybeObject* AllocateJSObject(
       JSFunction* constructor, PretenureFlag pretenure = NOT_TENURED);
 
+  // Allocate a JSArray with no elements
+  MUST_USE_RESULT MaybeObject* AllocateEmptyJSArray(
+      ElementsKind elements_kind,
+      PretenureFlag pretenure = NOT_TENURED) {
+    return AllocateJSArrayAndStorage(elements_kind, 0, 0,
+                                     DONT_INITIALIZE_ARRAY_ELEMENTS,
+                                     pretenure);
+  }
+
+  // Allocate a JSArray with a specified length but elements that are left
+  // uninitialized.
+  MUST_USE_RESULT MaybeObject* AllocateJSArrayAndStorage(
+      ElementsKind elements_kind,
+      int length,
+      int capacity,
+      ArrayStorageAllocationMode mode = DONT_INITIALIZE_ARRAY_ELEMENTS,
+      PretenureFlag pretenure = NOT_TENURED);
+
+  // Allocate a JSArray with no elements
+  MUST_USE_RESULT MaybeObject* AllocateJSArrayWithElements(
+      FixedArrayBase* array_base,
+      ElementsKind elements_kind,
+      PretenureFlag pretenure = NOT_TENURED);
+
   // Allocates and initializes a new global object based on a constructor.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
   MUST_USE_RESULT MaybeObject* AllocateGlobalObject(JSFunction* constructor);
 
   // Returns a deep copy of the JavaScript object.
   // Properties and elements are copied too.
   // Returns failure if allocation failed.
   MUST_USE_RESULT MaybeObject* CopyJSObject(JSObject* source);
@@ skipping 226 matching lines @@
       int length,
       PretenureFlag pretenure);
 
   // Allocates a fixed double array with uninitialized values. Returns
   // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
   // Please note this does not perform a garbage collection.
   MUST_USE_RESULT MaybeObject* AllocateUninitializedFixedDoubleArray(
       int length,
       PretenureFlag pretenure = NOT_TENURED);
 
+  // Allocates a fixed double array with hole values. Returns
+  // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
+  // Please note this does not perform a garbage collection.
+  MUST_USE_RESULT MaybeObject* AllocateFixedDoubleArrayWithHoles(
+      int length,
+      PretenureFlag pretenure = NOT_TENURED);
+
   // AllocateHashTable is identical to AllocateFixedArray except
   // that the resulting object has hash_table_map as map.
   MUST_USE_RESULT MaybeObject* AllocateHashTable(
       int length, PretenureFlag pretenure = NOT_TENURED);
 
   // Allocate a global (but otherwise uninitialized) context.
   MUST_USE_RESULT MaybeObject* AllocateGlobalContext();
 
   // Allocate a function context.
   MUST_USE_RESULT MaybeObject* AllocateFunctionContext(int length,
@@ skipping 945 matching lines @@
   // because of a gcc-4.4 bug that assigns wrong vtable entries.
   NO_INLINE(void CreateJSEntryStub());
   NO_INLINE(void CreateJSConstructEntryStub());
 
   void CreateFixedStubs();
 
   MaybeObject* CreateOddball(const char* to_string,
                              Object* to_number,
                              byte kind);
 
+  // Allocate a JSArray with no elements
+  MUST_USE_RESULT MaybeObject* AllocateJSArray(
+      ElementsKind elements_kind,
+      PretenureFlag pretenure = NOT_TENURED);
+
   // Allocate empty fixed array.
   MUST_USE_RESULT MaybeObject* AllocateEmptyFixedArray();
 
   // Allocate empty fixed double array.
   MUST_USE_RESULT MaybeObject* AllocateEmptyFixedDoubleArray();
 
   // Performs a minor collection in new generation.
   void Scavenge();
 
   static String* UpdateNewSpaceReferenceInExternalStringTableEntry(
@@ skipping 861 matching lines @@
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 } }  // namespace v8::internal
 
 #undef HEAP
 
 #endif  // V8_HEAP_H_