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+// Copyright 2006-2008 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
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+
+#ifndef V8_HANDLES_INL_H_
+#define V8_HANDLES_INL_H_
+
+#include "api.h"
+#include "apiutils.h"
+#include "handles.h"
+#include "isolate.h"
+
+namespace v8 {
+namespace internal {
+
+inline Isolate* GetIsolateForHandle(Object* obj) {
+ return Isolate::Current();
+}
+
+inline Isolate* GetIsolateForHandle(HeapObject* obj) {
+ return obj->GetIsolate();
+}
+
+template<typename T>
+Handle<T>::Handle(T* obj) {
+ ASSERT(!obj->IsFailure());
+ location_ = HandleScope::CreateHandle(obj, GetIsolateForHandle(obj));
+}
+
+
+template<typename T>
+Handle<T>::Handle(T* obj, Isolate* isolate) {
+ ASSERT(!obj->IsFailure());
+ location_ = HandleScope::CreateHandle(obj, isolate);
+}
+
+
+template <typename T>
+inline T* Handle<T>::operator*() const {
+ ASSERT(location_ != NULL);
+ ASSERT(reinterpret_cast<Address>(*location_) != kHandleZapValue);
+ return *BitCast<T**>(location_);
+}
+
+
+HandleScope::HandleScope() {
+ Isolate* isolate = Isolate::Current();
+ v8::ImplementationUtilities::HandleScopeData* current =
+ isolate->handle_scope_data();
+ isolate_ = isolate;
+ prev_next_ = current->next;
+ prev_limit_ = current->limit;
+ current->level++;
+}
+
+
+HandleScope::HandleScope(Isolate* isolate) {
+ ASSERT(isolate == Isolate::Current());
+ v8::ImplementationUtilities::HandleScopeData* current =
+ isolate->handle_scope_data();
+ isolate_ = isolate;
+ prev_next_ = current->next;
+ prev_limit_ = current->limit;
+ current->level++;
+}
+
+
+HandleScope::~HandleScope() {
+ CloseScope();
+}
+
+void HandleScope::CloseScope() {
+ ASSERT(isolate_ == Isolate::Current());
+ v8::ImplementationUtilities::HandleScopeData* current =
+ isolate_->handle_scope_data();
+ current->next = prev_next_;
+ current->level--;
+ if (current->limit != prev_limit_) {
+ current->limit = prev_limit_;
+ DeleteExtensions(isolate_);
+ }
+#ifdef DEBUG
+ ZapRange(prev_next_, prev_limit_);
+#endif
+}
+
+
+template <typename T>
+Handle<T> HandleScope::CloseAndEscape(Handle<T> handle_value) {
+ T* value = *handle_value;
+ // Throw away all handles in the current scope.
+ CloseScope();
+ v8::ImplementationUtilities::HandleScopeData* current =
+ isolate_->handle_scope_data();
+ // Allocate one handle in the parent scope.
+ ASSERT(current->level > 0);
+ Handle<T> result(CreateHandle<T>(value, isolate_));
+ // 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(T* value, Isolate* isolate) {
+ ASSERT(isolate == Isolate::Current());
+ v8::ImplementationUtilities::HandleScopeData* current =
+ isolate->handle_scope_data();
+
+ internal::Object** cur = current->next;
+ if (cur == current->limit) cur = Extend();
+ // Update the current next field, set the value in the created
+ // handle, and return the result.
+ ASSERT(cur < current->limit);
+ current->next = cur + 1;
+
+ T** result = reinterpret_cast<T**>(cur);
+ *result = value;
+ return result;
+}
+
+
+#ifdef DEBUG
+inline NoHandleAllocation::NoHandleAllocation() {
+ v8::ImplementationUtilities::HandleScopeData* current =
+ Isolate::Current()->handle_scope_data();
+
+ // Shrink the current handle scope to make it impossible to do
+ // handle allocations without an explicit handle scope.
+ current->limit = current->next;
+
+ level_ = current->level;
+ current->level = 0;
+}
+
+
+inline NoHandleAllocation::~NoHandleAllocation() {
+ // Restore state in current handle scope to re-enable handle
+ // allocations.
+ v8::ImplementationUtilities::HandleScopeData* data =
+ Isolate::Current()->handle_scope_data();
+ ASSERT_EQ(0, data->level);
+ data->level = level_;
+}
+#endif
+
+
+} } // namespace v8::internal
+
+#endif // V8_HANDLES_INL_H_