Make the store buffer smaller and handle store buffer

src/store-buffer.h

Index: src/store-buffer.h
===================================================================
--- src/store-buffer.h	(revision 8396)
+++ src/store-buffer.h	(working copy)
@@ -41,8 +41,11 @@
 
 typedef void (*ObjectSlotCallback)(HeapObject** from, HeapObject* to);
 
-typedef void (StoreBuffer::*RegionCallback)(
-    Address start, Address end, ObjectSlotCallback slot_callback);
+typedef void RegionCallback(
+    StoreBuffer* store_buffer,
+    Address start,
+    Address end,
+    ObjectSlotCallback slot_callback);
 
 // Used to implement the write barrier by collecting addresses of pointers
 // between spaces.
@@ -81,7 +84,7 @@
   // surviving old-to-new pointers into the store buffer to rebuild it.
   void IteratePointersToNewSpace(ObjectSlotCallback callback);
 
-  static const int kStoreBufferOverflowBit = 1 << 16;
+  static const int kStoreBufferOverflowBit = 1 << 12;
   static const int kStoreBufferSize = kStoreBufferOverflowBit;
   static const int kStoreBufferLength = kStoreBufferSize / sizeof(Address);
   static const int kOldStoreBufferLength = kStoreBufferLength * 64;
@@ -154,10 +157,31 @@
   bool HashTablesAreZapped();
   void ExemptPopularPages(int prime_sample_step, int threshold);
 
-  void FindPointersToNewSpaceInRegion(Address start,
-                                      Address end,
-                                      ObjectSlotCallback slot_callback);
+  enum RecordNewSpacePointers {
+    kDontRecord,
+    kRecord
+  };
 
+  template<RecordNewSpacePointers record>
+  inline void FindPointersToNewSpaceInRegion(Address start,
+                                             Address end,
+                                             ObjectSlotCallback slot_callback);
+
+  // It seems gcc doesn't want to take the address of a templated method,
+  // so we create a new method so that we can give the address.  Also,
+  // pointers to methods tend to have gnarly implementations.
+  static void FindPointersToNewSpaceInRegionRecord(
+      StoreBuffer* store_buffer,
+      Address start,
+      Address end,
+      ObjectSlotCallback slot_callback);
+
+  static void FindPointersToNewSpaceInRegionDontRecord(
+      StoreBuffer* store_buffer,
+      Address start,
+      Address end,
+      ObjectSlotCallback slot_callback);
+
   // For each region of pointers on a page in use from an old space call
   // visit_pointer_region callback.
   // If either visit_pointer_region or callback can cause an allocation
@@ -174,7 +198,8 @@
     Address end,
     ObjectSlotCallback slot_callback);
 
-  void FindPointersToNewSpaceInMapsRegion(
+  static void FindPointersToNewSpaceInMapsRegion(
+    StoreBuffer* store_buffer,
     Address start,
     Address end,
     ObjectSlotCallback slot_callback);