runtime/ScopeChain.cpp

   1 /*
   2  *  Copyright (C) 2003, 2006, 2008 Apple Inc.
   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 #include "config.h"
  22 #include "ScopeChain.h"
  23
  24 #include "JSActivation.h"
  25 #include "JSGlobalObject.h"
  26 #include "JSObject.h"
  27 #include "PropertyNameArray.h"
  28 #include <stdio.h>
  29
  30 namespace JSC {
  31
  32 #ifndef NDEBUG
  33
  34 void ScopeChainNode::print()
  35 {
  36     ScopeChainIterator scopeEnd = end();
  37     for (ScopeChainIterator scopeIter = begin(); scopeIter != scopeEnd; ++scopeIter) {
  38         JSObject* o = scopeIter->get();
  39         PropertyNameArray propertyNames(globalObject->globalExec());
  40         o->getPropertyNames(globalObject->globalExec(), propertyNames);
  41         PropertyNameArray::const_iterator propEnd = propertyNames.end();
  42
  43         fprintf(stderr, "----- [scope %p] -----\n", o);
  44         for (PropertyNameArray::const_iterator propIter = propertyNames.begin(); propIter != propEnd; propIter++) {
  45             Identifier name = *propIter;
  46             fprintf(stderr, "%s, ", name.ustring().utf8().data());
  47         }
  48         fprintf(stderr, "\n");
  49     }
  50 }
  51
  52 #endif
  53
  54 const ClassInfo ScopeChainNode::s_info = { "ScopeChainNode", 0, 0, 0 };
  55
  56 int ScopeChainNode::localDepth()
  57 {
  58     int scopeDepth = 0;
  59     ScopeChainIterator iter = this->begin();
  60     ScopeChainIterator end = this->end();
  61     while (!(*iter)->inherits(&JSActivation::s_info)) {
  62         ++iter;
  63         if (iter == end)
  64             break;
  65         ++scopeDepth;
  66     }
  67     return scopeDepth;
  68 }
  69
  70 void ScopeChainNode::visitChildren(SlotVisitor& visitor)
  71 {
  72     ASSERT_GC_OBJECT_INHERITS(this, &s_info);
  73     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
  74     ASSERT(structure()->typeInfo().overridesVisitChildren());
  75     if (next)
  76         visitor.append(&next);
  77     visitor.append(&object);
  78     visitor.append(&globalObject);
  79     visitor.append(&globalThis);
  80 }
  81
  82 } // namespace JSC