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 "GetterSetter.h"
  25 #include "JSFunction.h"
  26 #include "JSCInlines.h"
  27
  28 namespace JSC {
  29
  30 void HashTable::createTable() const
  31 {
  32     ASSERT(!keys);
  33     keys = static_cast<const char**>(fastMalloc(sizeof(char*) * numberOfValues));
  34
  35     for (int i = 0; i < numberOfValues; ++i) {
  36         if (values[i].m_key)
  37             keys[i] = values[i].m_key;
  38         else
  39             keys[i] = 0;
  40     }
  41 }
  42
  43 void HashTable::deleteTable() const
  44 {
  45     if (keys) {
  46         fastFree(keys);
  47         keys = nullptr;
  48     }
  49 }
  50
  51 void reifyStaticAccessor(VM& vm, const HashTableValue& value, JSObject& thisObj, PropertyName propertyName)
  52 {
  53     JSGlobalObject* globalObject = thisObj.globalObject();
  54     GetterSetter* accessor = GetterSetter::create(vm, globalObject);
  55     if (value.accessorGetter()) {
  56         RefPtr<StringImpl> getterName = WTF::tryMakeString(ASCIILiteral("get "), String(*propertyName.publicName()));
  57         if (!getterName)
  58             return;
  59         accessor->setGetter(vm, globalObject, JSFunction::create(vm, globalObject, 0, *getterName, value.accessorGetter()));
  60     }
  61     thisObj.putDirectNonIndexAccessor(vm, propertyName, accessor, value.attributes());
  62 }
  63
  64 bool setUpStaticFunctionSlot(ExecState* exec, const HashTableValue* entry, JSObject* thisObj, PropertyName propertyName, PropertySlot& slot)
  65 {
  66     ASSERT(thisObj->globalObject());
  67     ASSERT(entry->attributes() & BuiltinOrFunctionOrAccessor);
  68     VM& vm = exec->vm();
  69     unsigned attributes;
  70     bool isAccessor = entry->attributes() & Accessor;
  71     PropertyOffset offset = thisObj->getDirectOffset(vm, propertyName, attributes);
  72
  73     if (!isValidOffset(offset)) {
  74         // If a property is ever deleted from an object with a static table, then we reify
  75         // all static functions at that time - after this we shouldn't be re-adding anything.
  76         if (thisObj->staticFunctionsReified())
  77             return false;
  78
  79         if (entry->attributes() & Builtin)
  80             thisObj->putDirectBuiltinFunction(vm, thisObj->globalObject(), propertyName, entry->builtinGenerator()(vm), entry->attributes());
  81         else if (entry->attributes() & Function) {
  82             thisObj->putDirectNativeFunction(
  83                 vm, thisObj->globalObject(), propertyName, entry->functionLength(),
  84                 entry->function(), entry->intrinsic(), entry->attributes());
  85         } else {
  86             ASSERT(isAccessor);
  87             reifyStaticAccessor(vm, *entry, *thisObj, propertyName);
  88         }
  89
  90         offset = thisObj->getDirectOffset(vm, propertyName, attributes);
  91         ASSERT(isValidOffset(offset));
  92     }
  93
  94     if (isAccessor)
  95         slot.setCacheableGetterSlot(thisObj, attributes, jsCast<GetterSetter*>(thisObj->getDirect(offset)), offset);
  96     else
  97         slot.setValue(thisObj, attributes, thisObj->getDirect(offset), offset);
  98     return true;
  99 }
 100
 101 } // namespace JSC