RegExp stack and zone limits.

src/zone.h

Index: src/zone.h
diff --git a/src/zone.h b/src/zone.h
index c7129ec4b06a50500ae5295aad35db3d3e7fc1df..9721b0724b9324e6b9063753b58bb042d426bca3 100644
--- a/src/zone.h
+++ b/src/zone.h
@@ -61,7 +61,13 @@ class Zone {
   // Delete all objects and free all memory allocated in the Zone.
   static void DeleteAll();
 
+  // Returns true if more memory has been allocated in zones than
+  // the limit allows.
+  static inline bool excess_allocation();
+
  private:
+  friend class Segment;
+
   // All pointers returned from New() have this alignment.
   static const int kAlignment = kPointerSize;
 
@@ -71,6 +77,13 @@ class Zone {
   // Never keep segments larger than this size in bytes around.
   static const int kMaximumKeptSegmentSize = 64 * KB;
 
+  // Report zone excess when allocation exceeds this limit.
+  static int zone_excess_limit_;
+
+  // The number of bytes allocated in segments.  Note that this number
+  // includes memory allocated from the OS but not yet allocated from
+  // the zone.
+  static int segment_bytes_allocated_;
 
   // The Zone is intentionally a singleton; you should not try to
   // allocate instances of the class.