diff options
Diffstat (limited to 'Source/JavaScriptCore/collector/handles/LocalScope.h')
-rw-r--r-- | Source/JavaScriptCore/collector/handles/LocalScope.h | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/collector/handles/LocalScope.h b/Source/JavaScriptCore/collector/handles/LocalScope.h new file mode 100644 index 0000000..cd27b32 --- /dev/null +++ b/Source/JavaScriptCore/collector/handles/LocalScope.h @@ -0,0 +1,78 @@ +/* + * Copyright (C) 2010 Apple Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * + * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 LocalScope_h +#define LocalScope_h + +#include "HandleStack.h" +#include "Local.h" + +namespace JSC { +/* + A LocalScope is a temporary scope in which Locals are allocated. When a + LocalScope goes out of scope, all the Locals created in it are destroyed. + + LocalScope is similar in concept to NSAutoreleasePool. +*/ + +class JSGlobalData; + +class LocalScope { +public: + explicit LocalScope(JSGlobalData&); + ~LocalScope(); + + template <typename T> Local<T> release(Local<T>); // Destroys all other locals in the scope. + +private: + HandleStack* m_handleStack; + HandleStack::Frame m_lastFrame; +}; + +inline LocalScope::LocalScope(JSGlobalData& globalData) + : m_handleStack(globalData.heap.handleStack()) +{ + m_handleStack->enterScope(m_lastFrame); +} + +inline LocalScope::~LocalScope() +{ + m_handleStack->leaveScope(m_lastFrame); +} + +template <typename T> Local<T> LocalScope::release(Local<T> local) +{ + typename Local<T>::ExternalType ptr = local.get(); + + m_handleStack->leaveScope(m_lastFrame); + HandleSlot slot = m_handleStack->push(); + m_handleStack->enterScope(m_lastFrame); + + return Local<T>(slot, ptr); +} + +} + +#endif |