Split an allocation policy into an allocator and a deallocator.

src/zone.h

Index: src/zone.h
diff --git a/src/zone.h b/src/zone.h
index 864846553a234d82cfd88c3e527f1f5c7416e654..d8f71433b4d411474c44b0326d1d6e64efe4aa91 100644
--- a/src/zone.h
+++ b/src/zone.h
@@ -164,38 +164,46 @@ class ZoneObject {
 };
 
 
-// The ZoneListAllocationPolicy is used to specialize the GenericList
-// implementation to allocate ZoneLists and their elements in the
-// Zone.
-class ZoneListAllocationPolicy {
+class ZoneAllocator {
  public:
-  // Allocate 'size' bytes of memory in the zone.
-  static void* New(int size);
+  INLINE(void* New(int size));
+};
+
 
-  // De-allocation attempts are silently ignored.
-  static void Delete(void* p) { }
+// De-allocation attempts are silently ignored.
+class ZoneDeallocator {
+ public:
+  INLINE(void Delete(void* ptr)) { }
 };
 
 
+// The ZoneAllocationPolicy is used to specialize the generic List
+// implementation to allocate ZoneLists and their elements in the
+// Zone.
+struct ZoneAllocationPolicy {
+  typedef ZoneAllocator Allocator;
+  typedef ZoneDeallocator Deallocator;
+};
+
 // ZoneLists are growable lists with constant-time access to the
 // elements. The list itself and all its elements are allocated in the
 // Zone. ZoneLists cannot be deleted individually; you can delete all
 // objects in the Zone by calling Zone::DeleteAll().
 template<typename T>
-class ZoneList: public List<T, ZoneListAllocationPolicy> {
+class ZoneList: public List<T, ZoneAllocationPolicy> {
  public:
-  INLINE(void* operator new(size_t size));
-  INLINE(void* operator new(size_t size, Zone* zone));
-
   // Construct a new ZoneList with the given capacity; the length is
   // always zero. The capacity must be non-negative.
   explicit ZoneList(int capacity)
-      : List<T, ZoneListAllocationPolicy>(capacity) { }
+      : List<T, ZoneAllocationPolicy>(capacity) { }
+
+  INLINE(void* operator new(size_t size, Zone* zone));
+  INLINE(void* operator new(size_t size));
 
   // Construct a new ZoneList by copying the elements of the given ZoneList.
-  explicit ZoneList(const ZoneList<T>& other)
-      : List<T, ZoneListAllocationPolicy>(other.length()) {
-    AddAll(other);
+  explicit ZoneList(const ZoneList<T>& other, ZoneAllocator alloc)
+      : List<T, ZoneAllocationPolicy>(other.length()) {
+    AddAll(other, alloc);
   }
 
   void operator delete(void* pointer) { UNREACHABLE(); }
@@ -232,15 +240,15 @@ class ZoneScope BASE_EMBEDDED {
 // different configurations of a concrete splay tree (see splay-tree.h).
 // The tree itself and all its elements are allocated in the Zone.
 template <typename Config>
-class ZoneSplayTree: public SplayTree<Config, ZoneListAllocationPolicy> {
+class ZoneSplayTree: public SplayTree<Config, ZoneAllocationPolicy> {
  public:
   ZoneSplayTree()
-      : SplayTree<Config, ZoneListAllocationPolicy>() {}
+      : SplayTree<Config, ZoneAllocationPolicy>() {}
   ~ZoneSplayTree();
 };
 
 
-typedef TemplateHashMapImpl<ZoneListAllocationPolicy> ZoneHashMap;
+typedef TemplateHashMapImpl<ZoneAllocationPolicy> ZoneHashMap;
 
 } }  // namespace v8::internal