Split an allocation policy into an allocator and a deallocator.

src/zone-inl.h

Index: src/zone-inl.h
diff --git a/src/zone-inl.h b/src/zone-inl.h
index ee96ec052eb9863201fabbbed2f211b33d8e9c8e..380fa7ca6f9a3020dc774ecf2a92bed8bf9a2d3c 100644
--- a/src/zone-inl.h
+++ b/src/zone-inl.h
@@ -90,7 +90,7 @@ ZoneSplayTree<Config>::~ZoneSplayTree() {
   // Reset the root to avoid unneeded iteration over all tree nodes
   // in the destructor.  For a zone-allocated tree, nodes will be
   // freed by the Zone.
-  SplayTree<Config, ZoneListAllocationPolicy>::ResetRoot();
+  SplayTree<Config, ZoneAllocationPolicy>::ResetRoot();
 }
 
 
@@ -106,20 +106,23 @@ void* ZoneObject::operator new(size_t size, Zone* zone) {
 }
 
 
-inline void* ZoneListAllocationPolicy::New(int size) {
+void* ZoneAllocator::New(int size) {
   return ZONE->New(size);
 }
 
 
+// The ZoneAllocator is used to specialize the List implementation to
+// allocate ZoneLists and their elements in the current Zone.

[danno, 2012/05/25 11:03:37]

Does the comment apply to the following code?  I'm confused a bit.

 template <typename T>
-void* ZoneList<T>::operator new(size_t size) {
-  return ZONE->New(static_cast<int>(size));
+void* ZoneList<T>::operator new(size_t size, Zone* zone) {
+  return zone->New(static_cast<int>(size));
 }
 
 
-template <typename T>
-void* ZoneList<T>::operator new(size_t size, Zone* zone) {
-  return zone->New(static_cast<int>(size));
+// De-allocation attempts are silently ignored.

[danno, 2012/05/25 11:03:37]

This comment seems unrelated?

+template<typename T>
+void* ZoneList<T>::operator new(size_t size) {
+  return List<T, ZoneAllocationPolicy>::operator new(size);

[danno, 2012/05/25 11:03:37]

Why did you move this function?  And why does it need to change (you will be
eliminating it in the next step anyway, and this seems premature and unrelated
to the other changes you are making in this CL.

 }