On store buffer overflow we mark individidual pages for...

src/heap-inl.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 249 matching lines @@
 bool Heap::InFromSpace(Object* object) {
   return new_space_.FromSpaceContains(object);
 }
 
 
 bool Heap::InToSpace(Object* object) {
   return new_space_.ToSpaceContains(object);
 }
 
 
+bool Heap::OldGenerationAllocationLimitReached() {
+  if (!IncrementalMarking::IsStopped()) return false;
+  return OldGenerationSpaceAvailable() < 0;
+}
+
+
 bool Heap::ShouldBePromoted(Address old_address, int object_size) {
   // An object should be promoted if:
   // - the object has survived a scavenge operation or
   // - to space is already 25% full.
   return old_address < new_space_.age_mark()
       || (new_space_.Size() + object_size) >= (new_space_.Capacity() >> 2);
 }
 
 
 void Heap::RecordWrite(Address address, int offset) {
@@ skipping 101 matching lines @@
   // We use the first word (where the map pointer usually is) of a heap
   // object to record the forwarding pointer.  A forwarding pointer can
   // point to an old space, the code space, or the to space of the new
   // generation.
   MapWord first_word = object->map_word();
 
   // If the first word is a forwarding address, the object has already been
   // copied.
   if (first_word.IsForwardingAddress()) {
     HeapObject* dest = first_word.ToForwardingAddress();
+    ASSERT(InFromSpace(*p));
     *p = dest;
     Address slot = reinterpret_cast<Address>(p);
     if (Heap::InNewSpace(dest) && !Heap::InNewSpace(slot)) {
+      ASSERT(InToSpace(dest));
       StoreBuffer::EnterDirectlyIntoStoreBuffer(slot);
     }
     return;
   }
 
   // Call the slow part of scavenge object.
   return ScavengeObjectSlow(p, object);
 }
 
 
@@ skipping 167 matching lines @@
 
 
 void ExternalStringTable::ShrinkNewStrings(int position) {
   new_space_strings_.Rewind(position);
   Verify();
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_INL_H_