kjs/scope_chain_mark.h

   1 /*
   2  *  Copyright (C) 2003, 2006, 2008 Apple Inc. All rights reserved.
   3  *
   4  *  This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  *  This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU Library General Public License
  15  *  along with this library; see the file COPYING.LIB.  If not, write to
  16  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  *  Boston, MA 02110-1301, USA.
  18  *
  19  */
  20
  21 #ifndef scope_chain_mark_h
  22 #define scope_chain_mark_h
  23
  24 #include "Activation.h"
  25 #include "scope_chain.h"
  26
  27 namespace KJS {
  28
  29     inline void ScopeChain::mark()
  30     {
  31         for (ScopeChainNode* n = _node; n; n = n->next) {
  32             JSObject* o = n->object;
  33
  34             // An ActivationImp that is on the activation stack can't have the
  35             // JSObject::marked() method called on it, because it doesn't have an
  36             // entry in a GC mark bitmap, so we check here whether it is on the
  37             // stack and directly call the portion of the marking code that is
  38             // still relevant.
  39
  40             if (o->isActivationObject() && static_cast<ActivationImp*>(o)->isOnStack())
  41                 static_cast<ActivationImp*>(o)->markChildren();
  42             else if (!o->marked())
  43                 o->mark();
  44         }
  45     }
  46
  47 } // namespace KJS
  48
  49 #endif