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 ASSERT_HAS_TRIVIAL_DESTRUCTOR(ScopeChainNode);
  33
  34 #ifndef NDEBUG
  35
  36 void ScopeChainNode::print()
  37 {
  38     ScopeChainIterator scopeEnd = end();
  39     for (ScopeChainIterator scopeIter = begin(); scopeIter != scopeEnd; ++scopeIter) {
  40         JSObject* o = scopeIter->get();
  41         PropertyNameArray propertyNames(globalObject->globalExec());
  42         o->methodTable()->getPropertyNames(o, globalObject->globalExec(), propertyNames, ExcludeDontEnumProperties);
  43         PropertyNameArray::const_iterator propEnd = propertyNames.end();
  44
  45         dataLog("----- [scope %p] -----\n", o);
  46         for (PropertyNameArray::const_iterator propIter = propertyNames.begin(); propIter != propEnd; propIter++) {
  47             Identifier name = *propIter;
  48             dataLog("%s, ", name.ustring().utf8().data());
  49         }
  50         dataLog("\n");
  51     }
  52 }
  53
  54 #endif
  55
  56 const ClassInfo ScopeChainNode::s_info = { "ScopeChainNode", 0, 0, 0, CREATE_METHOD_TABLE(ScopeChainNode) };
  57
  58 int ScopeChainNode::localDepth()
  59 {
  60     int scopeDepth = 0;
  61     ScopeChainIterator iter = this->begin();
  62     ScopeChainIterator end = this->end();
  63     while (!(*iter)->inherits(&JSActivation::s_info)) {
  64         ++iter;
  65         if (iter == end)
  66             break;
  67         ++scopeDepth;
  68     }
  69     return scopeDepth;
  70 }
  71
  72 void ScopeChainNode::visitChildren(JSCell* cell, SlotVisitor& visitor)
  73 {
  74     ScopeChainNode* thisObject = jsCast<ScopeChainNode*>(cell);
  75     ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
  76     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
  77     ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
  78     if (thisObject->next)
  79         visitor.append(&thisObject->next);
  80     visitor.append(&thisObject->object);
  81     visitor.append(&thisObject->globalObject);
  82     visitor.append(&thisObject->globalThis);
  83 }
  84
  85 } // namespace JSC