1 /*

     2  * Copyright (C) 2008 Apple Inc. All rights reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  *

     8  * 1.  Redistributions of source code must retain the above copyright

     9  *     notice, this list of conditions and the following disclaimer.

    10  * 2.  Redistributions in binary form must reproduce the above copyright

    11  *     notice, this list of conditions and the following disclaimer in the

    12  *     documentation and/or other materials provided with the distribution.

    13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

    14  *     its contributors may be used to endorse or promote products derived

    15  *     from this software without specific prior written permission.

    16  *

    17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

    18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

    19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

    20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

    21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

    22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

    23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

    24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

    26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    27  */

    28 

    29 #ifndef LabelScope_h

    30 #define LabelScope_h

    31 

    32 #include <wtf/PassRefPtr.h>

    33 #include "Label.h"

    34 

    35 namespace JSC {

    36 

    37     class Identifier;

    38 

    39     class LabelScope {

    40     public:

    41         enum Type { Loop, Switch, NamedLabel };

    42 

    43         LabelScope(Type type, const Identifier* name, int scopeDepth, PassRefPtr<Label> breakTarget, PassRefPtr<Label> continueTarget)

    44             : m_refCount(0)

    45             , m_type(type)

    46             , m_name(name)

    47             , m_scopeDepth(scopeDepth)

    48             , m_breakTarget(breakTarget)

    49             , m_continueTarget(continueTarget)

    50         {

    51         }

    52 

    53         void ref() { ++m_refCount; }

    54         void deref()

    55         {

    56             --m_refCount;

    57             ASSERT(m_refCount >= 0);

    58         }

    59         int refCount() const { return m_refCount; }

    60 

    61         Label* breakTarget() const { return m_breakTarget.get(); }

    62         Label* continueTarget() const { return m_continueTarget.get(); }

    63 

    64         Type type() const { return m_type; }

    65         const Identifier* name() const { return m_name; }

    66         int scopeDepth() const { return m_scopeDepth; }

    67 

    68     private:

    69         int m_refCount;

    70         Type m_type;

    71         const Identifier* m_name;

    72         int m_scopeDepth;

    73         RefPtr<Label> m_breakTarget;

    74         RefPtr<Label> m_continueTarget;

    75     };

    76 

    77 } // namespace JSC

    78 

    79 #endif // LabelScope_h