[handles] Sanitize Handle and friends.

src/handles-inl.h

 // Copyright 2006-2008 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.
-//
-
-#ifndef V8_HANDLES_INL_H_
-#define V8_HANDLES_INL_H_
 
 #include "src/api.h"
 #include "src/handles.h"
 #include "src/heap/heap.h"
 #include "src/isolate.h"
 
-namespace v8 {
-namespace internal {
-
-template<typename T>
-Handle<T>::Handle(T* obj) {
-  location_ = HandleScope::CreateHandle(obj->GetIsolate(), obj);
-}
-
-
-template<typename T>
-Handle<T>::Handle(T* obj, Isolate* isolate) {
-  location_ = HandleScope::CreateHandle(isolate, obj);
-}
-
-
-template <typename T>
-inline bool Handle<T>::is_identical_to(const Handle<T> o) const {
-  // Dereferencing deferred handles to check object equality is safe.
-  SLOW_DCHECK(
-      (location_ == NULL || IsDereferenceAllowed(NO_DEFERRED_CHECK)) &&
-      (o.location_ == NULL || o.IsDereferenceAllowed(NO_DEFERRED_CHECK)));
-  if (location_ == o.location_) return true;
-  if (location_ == NULL || o.location_ == NULL) return false;
-  return *location_ == *o.location_;
-}
-
-
-template <typename T>
-inline T* Handle<T>::operator*() const {
-  SLOW_DCHECK(IsDereferenceAllowed(INCLUDE_DEFERRED_CHECK));
-  return *bit_cast<T**>(location_);
-}
-
-template <typename T>
-inline T** Handle<T>::location() const {
-  SLOW_DCHECK(location_ == NULL ||
-              IsDereferenceAllowed(INCLUDE_DEFERRED_CHECK));
-  return location_;
-}
-
-#ifdef DEBUG
-template <typename T>
-bool Handle<T>::IsDereferenceAllowed(DereferenceCheckMode mode) const {
-  DCHECK(location_ != NULL);
-  Object* object = *bit_cast<T**>(location_);
-  if (object->IsSmi()) return true;
-  HeapObject* heap_object = HeapObject::cast(object);
-  Heap* heap = heap_object->GetHeap();
-  Object** handle = reinterpret_cast<Object**>(location_);
-  Object** roots_array_start = heap->roots_array_start();
-  if (roots_array_start <= handle &&
-      handle < roots_array_start + Heap::kStrongRootListLength &&
-      heap->RootCanBeTreatedAsConstant(
-        static_cast<Heap::RootListIndex>(handle - 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(handle);
-  }
-  return true;
-}
-#endif
-
-
-
-HandleScope::HandleScope(Isolate* isolate) {
-  HandleScopeData* current = isolate->handle_scope_data();
-  isolate_ = isolate;
-  prev_next_ = current->next;
-  prev_limit_ = current->limit;
-  current->level++;
-}
-
-
-HandleScope::~HandleScope() {
-  CloseScope(isolate_, prev_next_, prev_limit_);
-}
-
-
-void HandleScope::CloseScope(Isolate* isolate,
-                             Object** prev_next,
-                             Object** prev_limit) {
-  HandleScopeData* current = isolate->handle_scope_data();
-
-  std::swap(current->next, prev_next);
-  current->level--;
-  if (current->limit != prev_limit) {
-    current->limit = prev_limit;
-    DeleteExtensions(isolate);
-#ifdef ENABLE_HANDLE_ZAPPING
-    ZapRange(current->next, prev_limit);
-  } else {
-    ZapRange(current->next, prev_next);
-#endif
-  }
-}
-
-
-template <typename T>
-Handle<T> HandleScope::CloseAndEscape(Handle<T> handle_value) {
-  HandleScopeData* current = isolate_->handle_scope_data();
-
-  T* value = *handle_value;
-  // Throw away all handles in the current scope.
-  CloseScope(isolate_, prev_next_, prev_limit_);
-  // Allocate one handle in the parent scope.
-  DCHECK(current->level > 0);
-  Handle<T> result(CreateHandle<T>(isolate_, value));
-  // Reinitialize the current scope (so that it's ready
-  // to be used or closed again).
-  prev_next_ = current->next;
-  prev_limit_ = current->limit;
-  current->level++;
-  return result;
-}
-
-
-template <typename T>
-T** HandleScope::CreateHandle(Isolate* isolate, T* value) {
-  DCHECK(AllowHandleAllocation::IsAllowed());
-  HandleScopeData* current = isolate->handle_scope_data();
-
-  internal::Object** cur = current->next;
-  if (cur == current->limit) cur = Extend(isolate);
-  // Update the current next field, set the value in the created
-  // handle, and return the result.
-  DCHECK(cur < current->limit);
-  current->next = cur + 1;
-
-  T** result = reinterpret_cast<T**>(cur);
-  *result = value;
-  return result;
-}
-
-
-#ifdef DEBUG
-inline SealHandleScope::SealHandleScope(Isolate* isolate) : isolate_(isolate) {
-  // Make sure the current thread is allowed to create handles to begin with.
-  CHECK(AllowHandleAllocation::IsAllowed());
-  HandleScopeData* current = isolate_->handle_scope_data();
-  // Shrink the current handle scope to make it impossible to do
-  // handle allocations without an explicit handle scope.
-  limit_ = current->limit;
-  current->limit = current->next;
-  level_ = current->level;
-  current->level = 0;
-}
-
-
-inline SealHandleScope::~SealHandleScope() {
-  // Restore state in current handle scope to re-enable handle
-  // allocations.
-  HandleScopeData* current = isolate_->handle_scope_data();
-  DCHECK_EQ(0, current->level);
-  current->level = level_;
-  DCHECK_EQ(current->next, current->limit);
-  current->limit = limit_;
-}
-
-#endif
-
-} }  // namespace v8::internal
-
-#endif  // V8_HANDLES_INL_H_
+// TODO(bmeurer): Break all include cycles and remove this file!