Get rid of ZoneScope completely.

src/zone.h

Index: src/zone.h
diff --git a/src/zone.h b/src/zone.h
index 128552a57a44c661fb7cb64b516b405e8e9f46d2..e6a200871c9aa3ef9a198c639c4ef95b2a5275e5 100644
--- a/src/zone.h
+++ b/src/zone.h
@@ -39,13 +39,6 @@ namespace v8 {
 namespace internal {
 
 
-// Zone scopes are in one of two modes.  Either they delete the zone
-// on exit or they do not.
-enum ZoneScopeMode {
-  DELETE_ON_EXIT,
-  DONT_DELETE_ON_EXIT
-};
-
 class Segment;
 class Isolate;
 
@@ -65,7 +58,7 @@ class Isolate;
 class Zone {
  public:
   explicit Zone(Isolate* isolate);
-  ~Zone() { DeleteKeptSegment(); }
+  ~Zone();
   // Allocate 'size' bytes of memory in the Zone; expands the Zone by
   // allocating new segments of memory on demand using malloc().
   inline void* New(int size);
@@ -73,13 +66,6 @@ class Zone {
   template <typename T>
   inline T* NewArray(int length);
 
-  // Deletes all objects and free all memory allocated in the Zone. Keeps one
-  // small (size <= kMaximumKeptSegmentSize) segment around if it finds one.
-  void DeleteAll();
-
-  // Deletes the last small segment kept around by DeleteAll().
-  void DeleteKeptSegment();
-
   // Returns true if more memory has been allocated in zones than
   // the limit allows.
   inline bool excess_allocation();
@@ -92,7 +78,6 @@ class Zone {
 
  private:
   friend class Isolate;
-  friend class ZoneScope;
 
   // All pointers returned from New() have this alignment.  In addition, if the
   // object being allocated has a size that is divisible by 8 then its alignment
@@ -105,9 +90,6 @@ class Zone {
   // Never allocate segments larger than this size in bytes.
   static const int kMaximumSegmentSize = 1 * MB;
 
-  // Never keep segments larger than this size in bytes around.
-  static const int kMaximumKeptSegmentSize = 64 * KB;
-
   // Report zone excess when allocation exceeds this limit.
   int zone_excess_limit_;
 
@@ -138,8 +120,6 @@ class Zone {
   Address position_;
   Address limit_;
 
-  int scope_nesting_;
-
   Segment* segment_head_;
   Isolate* isolate_;
 };
@@ -232,33 +212,6 @@ class ZoneList: public List<T, ZoneAllocationPolicy> {
 };
 
 
-// ZoneScopes keep track of the current parsing and compilation
-// nesting and cleans up generated ASTs in the Zone when exiting the
-// outer-most scope.
-class ZoneScope BASE_EMBEDDED {
- public:
-  INLINE(ZoneScope(Zone* zone, ZoneScopeMode mode));
-
-  virtual ~ZoneScope();
-
-  Zone* zone() const { return zone_; }
-
-  inline bool ShouldDeleteOnExit();
-
-  // For ZoneScopes that do not delete on exit by default, call this
-  // method to request deletion on exit.
-  void DeleteOnExit() {
-    mode_ = DELETE_ON_EXIT;
-  }
-
-  inline static int nesting();
-
- private:
-  Zone* zone_;
-  ZoneScopeMode mode_;
-};
-
-
 // A zone splay tree.  The config type parameter encapsulates the
 // different configurations of a concrete splay tree (see splay-tree.h).
 // The tree itself and all its elements are allocated in the Zone.