bytecompiler/LabelScope.h

   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