Revert of [handles] Sanitize Handle and friends.

src/handles.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/handles.h"
 
 namespace v8 {
 namespace internal {
 
-#ifdef DEBUG
-bool HandleBase::IsDereferenceAllowed(DereferenceCheckMode mode) const {
-  DCHECK_NOT_NULL(location_);
-  Object* object = *location_;
-  if (object->IsSmi()) return true;
-  HeapObject* heap_object = HeapObject::cast(object);
-  Heap* heap = heap_object->GetHeap();
-  Object** roots_array_start = heap->roots_array_start();
-  if (roots_array_start <= location_ &&
-      location_ < roots_array_start + Heap::kStrongRootListLength &&
-      heap->RootCanBeTreatedAsConstant(
-          static_cast<Heap::RootListIndex>(location_ - roots_array_start))) {
-    return true;
-  }
-  if (!AllowHandleDereference::IsAllowed()) return false;
-  if (mode == INCLUDE_DEFERRED_CHECK &&
-      !AllowDeferredHandleDereference::IsAllowed()) {
-    // Accessing cells, maps and internalized strings is safe.
-    if (heap_object->IsCell()) return true;
-    if (heap_object->IsMap()) return true;
-    if (heap_object->IsInternalizedString()) return true;
-    return !heap->isolate()->IsDeferredHandle(location_);
-  }
-  return true;
-}
-#endif
-
-
 int HandleScope::NumberOfHandles(Isolate* isolate) {
   HandleScopeImplementer* impl = isolate->handle_scope_implementer();
   int n = impl->blocks()->length();
   if (n == 0) return 0;
   return ((n - 1) * kHandleBlockSize) + static_cast<int>(
       (isolate->handle_scope_data()->next - impl->blocks()->last()));
 }
 
 
 Object** HandleScope::Extend(Isolate* isolate) {
@@ skipping 38 matching lines @@
 void HandleScope::DeleteExtensions(Isolate* isolate) {
   HandleScopeData* current = isolate->handle_scope_data();
   isolate->handle_scope_implementer()->DeleteExtensions(current->limit);
 }
 
 
 #ifdef ENABLE_HANDLE_ZAPPING
 void HandleScope::ZapRange(Object** start, Object** end) {
   DCHECK(end - start <= kHandleBlockSize);
   for (Object** p = start; p != end; p++) {
-    *reinterpret_cast<Address*>(p) = kHandleZapValue;
+    *reinterpret_cast<Address*>(p) = v8::internal::kHandleZapValue;
   }
 }
 #endif
 
 
 Address HandleScope::current_level_address(Isolate* isolate) {
   return reinterpret_cast<Address>(&isolate->handle_scope_data()->level);
 }
 
 
@@ skipping 40 matching lines @@
   data->next = prev_next_;
   data->limit = prev_limit_;
 #ifdef DEBUG
   handles_detached_ = true;
 #endif
   return deferred;
 }
 
 }  // namespace internal
 }  // namespace v8