Add field nested_sites to AllocationSite.

src/objects.cc

 // Copyright 2013 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 8935 matching lines @@
   if (Marking::IsBlack(Marking::MarkBitFrom(start_of_string))) {
     MemoryChunk::IncrementLiveBytesFromMutator(start_of_string, -delta);
   }
 
 
   if (new_length == 0) return heap->isolate()->factory()->empty_string();
   return string;
 }
 
 
+AllocationSite* AllocationSite::GetLastNestedSite() {
+  AllocationSite* current_site = this;
+  while (current_site->nested_sites() != Smi::FromInt(0)) {
+    current_site = AllocationSite::cast(current_site->nested_sites());
+  }
+  return current_site == this ? NULL : current_site;
+}
+
+
+void AllocationSite::AppendNestedSite(AllocationSite* nested_site) {
+  AllocationSite* last_nested_site = GetLastNestedSite();
+  AllocationSite* append_to = last_nested_site == NULL
+      ? this
+      : last_nested_site;
+  append_to->set_nested_sites(nested_site);
+}
+
+
 AllocationMemento* AllocationMemento::FindForJSObject(JSObject* object) {
   // Currently, AllocationMemento objects are only allocated immediately
   // after JSArrays in NewSpace, and detecting whether a JSArray has one
   // involves carefully checking the object immediately after the JSArray
   // (if there is one) to see if it's an AllocationMemento.
   if (FLAG_track_allocation_sites && object->GetHeap()->InNewSpace(object)) {
     ASSERT(object->GetHeap()->InToSpace(object));
     Address ptr_end = (reinterpret_cast<Address>(object) - kHeapObjectTag) +
         object->Size();
     if ((ptr_end + AllocationMemento::kSize) <=
@@ skipping 7121 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal