runtime/Lookup.cpp

   1 /*
   2  *  Copyright (C) 2008, 2012 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 Lesser 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  *  Lesser General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU Lesser General Public
  15  *  License along with this library; if not, write to the Free Software
  16  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  17  *
  18  */
  19
  20 #include "config.h"
  21 #include "Lookup.h"
  22
  23 #include "Executable.h"
  24 #include "JSFunction.h"
  25 #include "JSCInlines.h"
  26
  27 namespace JSC {
  28
  29 void HashTable::createTable(VM&) const
  30 {
  31     ASSERT(!keys);
  32     keys = static_cast<const char**>(fastMalloc(sizeof(char*) * numberOfValues));
  33
  34     for (int i = 0; i < numberOfValues; ++i) {
  35         if (values[i].m_key)
  36             keys[i] = values[i].m_key;
  37         else
  38             keys[i] = 0;
  39     }
  40 }
  41
  42 void HashTable::deleteTable() const
  43 {
  44     if (keys) {
  45         fastFree(keys);
  46         keys = nullptr;
  47     }
  48 }
  49
  50 bool setUpStaticFunctionSlot(ExecState* exec, const HashTableValue* entry, JSObject* thisObj, PropertyName propertyName, PropertySlot& slot)
  51 {
  52     ASSERT(thisObj->globalObject());
  53     ASSERT(entry->attributes() & BuiltinOrFunction);
  54     VM& vm = exec->vm();
  55     unsigned attributes;
  56     PropertyOffset offset = thisObj->getDirectOffset(vm, propertyName, attributes);
  57
  58     if (!isValidOffset(offset)) {
  59         // If a property is ever deleted from an object with a static table, then we reify
  60         // all static functions at that time - after this we shouldn't be re-adding anything.
  61         if (thisObj->staticFunctionsReified())
  62             return false;
  63
  64         if (entry->attributes() & Builtin)
  65             thisObj->putDirectBuiltinFunction(vm, thisObj->globalObject(), propertyName, entry->builtinGenerator()(vm), entry->attributes());
  66         else {
  67             thisObj->putDirectNativeFunction(
  68                 vm, thisObj->globalObject(), propertyName, entry->functionLength(),
  69                 entry->function(), entry->intrinsic(), entry->attributes());
  70         }
  71         offset = thisObj->getDirectOffset(vm, propertyName, attributes);
  72         ASSERT(isValidOffset(offset));
  73     }
  74
  75     slot.setValue(thisObj, attributes, thisObj->getDirect(offset), offset);
  76     return true;
  77 }
  78
  79 } // namespace JSC