introduce eternal handles

src/global-handles.cc

 // Copyright 2009 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 1000 matching lines @@
       }
     }
   }
   object_group_connections_.Clear();
   object_group_connections_.Initialize(kObjectGroupConnectionsCapacity);
   retainer_infos_.Clear();
   implicit_ref_connections_.Clear();
 }
 
 
+EternalHandles::EternalHandles()
+    : size_(0), blocks_(NULL) {
+  for (unsigned i = 0; i < ARRAY_SIZE(indexed_handles_); i++) {
+    indexed_handles_[i] = kInvalidIndex;
+  }
+}
+
+
+EternalHandles::~EternalHandles() {
+  for (BlockStore::iterator it = block_store_.begin();
+      it != block_store_.end(); it++) {
+    delete[] *it;
+  }
+}
+
+
+void EternalHandles::IterateAllRoots(ObjectVisitor* visitor) {
+  int limit = size_;
+  for (BlockStore::iterator it = block_store_.begin();
+      it != block_store_.end(); it++) {
+    visitor->VisitPointers(*it, *it + Min(limit, kSize));
+    limit -= kSize;
+  }
+}
+
+
+int EternalHandles::Create(Isolate* isolate, Object* object) {
+  if (object == NULL) return kInvalidIndex;
+  int block = size_ >> kShift;
+  int offset = size_ & kMask;
+  // need to resize
+  if (offset == 0) {
+    Object** next_block = new Object*[kSize];
+    Object* undefined = isolate->heap()->undefined_value();
+    for (int i = 0; i < kSize; i++) {
+      next_block[i] = undefined;
+    }
+    block_store_.push_back(next_block);
+    blocks_ = &block_store_.front();
+  }
+  ASSERT_EQ(isolate->heap()->undefined_value(), blocks_[block][offset]);
+  blocks_[block][offset] = object;
+  return size_++;
+}
+
+
 } }  // namespace v8::internal