Source/JavaScriptCore/runtime/Lookup.cpp

   1 /*
   2  *  Copyright (C) 2008, 2012, 2015-2016 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 reifyStaticAccessor(VM& vm, const HashTableValue& value, JSObject& thisObj, PropertyName propertyName)
  31 {
  32     JSGlobalObject* globalObject = thisObj.globalObject();
  33     GetterSetter* accessor = GetterSetter::create(vm, globalObject);
  34     if (value.accessorGetter()) {
  35         String getterName = WTF::tryMakeString(ASCIILiteral("get "), String(*propertyName.publicName()));
  36         if (!getterName)
  37             return;
  38         accessor->setGetter(vm, globalObject, value.attributes() & Builtin
  39             ? JSFunction::createBuiltinFunction(vm, value.builtinAccessorGetterGenerator()(vm), globalObject, getterName)
  40             : JSFunction::create(vm, globalObject, 0, getterName, value.accessorGetter()));
  41     }
  42     thisObj.putDirectNonIndexAccessor(vm, propertyName, accessor, attributesForStructure(value.attributes()));
  43 }
  44
  45 bool setUpStaticFunctionSlot(ExecState* exec, const HashTableValue* entry, JSObject* thisObj, PropertyName propertyName, PropertySlot& slot)
  46 {
  47     ASSERT(thisObj->globalObject());
  48     ASSERT(entry->attributes() & BuiltinOrFunctionOrAccessorOrLazyProperty);
  49     VM& vm = exec->vm();
  50     unsigned attributes;
  51     bool isAccessor = entry->attributes() & Accessor;
  52     PropertyOffset offset = thisObj->getDirectOffset(vm, propertyName, attributes);
  53
  54     if (!isValidOffset(offset)) {
  55         // If a property is ever deleted from an object with a static table, then we reify
  56         // all static functions at that time - after this we shouldn't be re-adding anything.
  57         if (thisObj->staticFunctionsReified())
  58             return false;
  59
  60         if (entry->attributes() & Builtin)
  61             thisObj->putDirectBuiltinFunction(vm, thisObj->globalObject(), propertyName, entry->builtinGenerator()(vm), attributesForStructure(entry->attributes()));
  62         else if (entry->attributes() & Function) {
  63             thisObj->putDirectNativeFunction(
  64                 vm, thisObj->globalObject(), propertyName, entry->functionLength(),
  65                 entry->function(), entry->intrinsic(), attributesForStructure(entry->attributes()));
  66         } else if (isAccessor)
  67             reifyStaticAccessor(vm, *entry, *thisObj, propertyName);
  68         else if (entry->attributes() & CellProperty) {
  69             LazyCellProperty* property = bitwise_cast<LazyCellProperty*>(
  70                 bitwise_cast<char*>(thisObj) + entry->lazyCellPropertyOffset());
  71             JSCell* result = property->get(thisObj);
  72             thisObj->putDirect(vm, propertyName, result, attributesForStructure(entry->attributes()));
  73         } else if (entry->attributes() & ClassStructure) {
  74             LazyClassStructure* structure = bitwise_cast<LazyClassStructure*>(
  75                 bitwise_cast<char*>(thisObj) + entry->lazyClassStructureOffset());
  76             structure->get(jsCast<JSGlobalObject*>(thisObj));
  77         } else if (entry->attributes() & PropertyCallback) {
  78             JSValue result = entry->lazyPropertyCallback()(vm, thisObj);
  79             thisObj->putDirect(vm, propertyName, result, attributesForStructure(entry->attributes()));
  80         } else
  81             RELEASE_ASSERT_NOT_REACHED();
  82
  83         offset = thisObj->getDirectOffset(vm, propertyName, attributes);
  84         RELEASE_ASSERT(isValidOffset(offset));
  85     }
  86
  87     if (isAccessor)
  88         slot.setCacheableGetterSlot(thisObj, attributes, jsCast<GetterSetter*>(thisObj->getDirect(offset)), offset);
  89     else
  90         slot.setValue(thisObj, attributes, thisObj->getDirect(offset), offset);
  91     return true;
  92 }
  93
  94 } // namespace JSC