| /* |
| * Copyright (C) 2008 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. |
| * 3. Neither the name of Apple Inc. ("Apple") 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 APPLE 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 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. |
| */ |
| |
| #pragma once |
| |
| #include "Label.h" |
| |
| namespace JSC { |
| |
| class Identifier; |
| |
| class LabelScope { |
| WTF_MAKE_NONCOPYABLE(LabelScope); |
| public: |
| enum Type { Loop, Switch, NamedLabel }; |
| |
| LabelScope(Type type, const Identifier* name, int scopeDepth, Ref<Label>&& breakTarget, RefPtr<Label>&& continueTarget) |
| : m_refCount(0) |
| , m_type(type) |
| , m_name(name) |
| , m_scopeDepth(scopeDepth) |
| , m_breakTarget(WTFMove(breakTarget)) |
| , m_continueTarget(WTFMove(continueTarget)) |
| { |
| } |
| |
| Label& breakTarget() const { return m_breakTarget.get(); } |
| Label* continueTarget() const { return m_continueTarget.get(); } |
| |
| Type type() const { return m_type; } |
| const Identifier* name() const { return m_name; } |
| int scopeDepth() const { return m_scopeDepth; } |
| |
| void ref() { ++m_refCount; } |
| void deref() |
| { |
| --m_refCount; |
| ASSERT(m_refCount >= 0); |
| } |
| int refCount() const { return m_refCount; } |
| bool hasOneRef() const { return m_refCount == 1; } |
| |
| bool breakTargetMayBeBound() const |
| { |
| if (!hasOneRef()) |
| return true; |
| if (!m_breakTarget->hasOneRef()) |
| return true; |
| return m_breakTarget->isBound(); |
| } |
| |
| private: |
| int m_refCount; |
| Type m_type; |
| const Identifier* m_name; |
| int m_scopeDepth; |
| Ref<Label> m_breakTarget; |
| RefPtr<Label> m_continueTarget; |
| }; |
| |
| } // namespace JSC |