Bookkeeping for allocation site pretenuring

src/allocation-site-scopes.h

 // 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 23 matching lines @@
 #include "zone.h"
 
 namespace v8 {
 namespace internal {
 
 
 // AllocationSiteContext is the base class for walking and copying a nested
 // boilerplate with AllocationSite and AllocationMemento support.
 class AllocationSiteContext {
  public:
-  AllocationSiteContext(Isolate* isolate, bool activated) {
+  explicit AllocationSiteContext(Isolate* isolate) {
     isolate_ = isolate;
-    activated_ = activated;
   };
 
   Handle<AllocationSite> top() { return top_; }
   Handle<AllocationSite> current() { return current_; }
 
-  // If activated, then recursively create mementos
-  bool activated() const { return activated_; }
+  bool ShouldCreateMemento(Handle<JSObject> object) { return false; }
 
   Isolate* isolate() { return isolate_; }
 
  protected:
   void update_current_site(AllocationSite* site) {
     *(current_.location()) = site;
   }
 
   void InitializeTraversal(Handle<AllocationSite> site) {
     top_ = site;
     current_ = Handle<AllocationSite>(*top_, isolate());
   }
 
  private:
   Isolate* isolate_;
   Handle<AllocationSite> top_;
   Handle<AllocationSite> current_;
-  bool activated_;
 };
 
 
 // AllocationSiteCreationContext aids in the creation of AllocationSites to
 // accompany object literals.
 class AllocationSiteCreationContext : public AllocationSiteContext {
  public:
   explicit AllocationSiteCreationContext(Isolate* isolate)
-      : AllocationSiteContext(isolate, true) { }
+      : AllocationSiteContext(isolate) { }
 
   Handle<AllocationSite> EnterNewScope();
   void ExitScope(Handle<AllocationSite> site, Handle<JSObject> object);
 };
 
 
 // AllocationSiteUsageContext aids in the creation of AllocationMementos placed
 // behind some/all components of a copied object literal.
 class AllocationSiteUsageContext : public AllocationSiteContext {
  public:
   AllocationSiteUsageContext(Isolate* isolate, Handle<AllocationSite> site,
                              bool activated)
-      : AllocationSiteContext(isolate, activated),
-        top_site_(site) { }
+      : AllocationSiteContext(isolate),
+        top_site_(site),
+        activated_(activated) { }
 
   inline Handle<AllocationSite> EnterNewScope() {
     if (top().is_null()) {
       InitializeTraversal(top_site_);
     } else {
       // Advance current site
       Object* nested_site = current()->nested_site();
       // Something is wrong if we advance to the end of the list here.
       ASSERT(nested_site->IsAllocationSite());
       update_current_site(AllocationSite::cast(nested_site));
     }
     return Handle<AllocationSite>(*current(), isolate());
   }
 
   inline void ExitScope(Handle<AllocationSite> scope_site,
                         Handle<JSObject> object) {
     // This assert ensures that we are pointing at the right sub-object in a
     // recursive walk of a nested literal.
     ASSERT(object.is_null() || *object == scope_site->transition_info());
   }
 
+  bool ShouldCreateMemento(Handle<JSObject> object);
+
  private:
   Handle<AllocationSite> top_site_;
+  bool activated_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ALLOCATION_SITE_SCOPES_H_