Source/JavaScriptCore/runtime/Lookup.cpp

/*
 *  Copyright (C) 2008, 2012 Apple Inc. All rights reserved.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include "config.h"
#include "Lookup.h"

#include "Executable.h"
#include "JSFunction.h"
#include "Operations.h"

namespace JSC {

void HashTable::createTable(VM& vm) const
{
    ASSERT(!table);
    int linkIndex = compactHashSizeMask + 1;
    HashEntry* entries = new HashEntry[compactSize];
    for (int i = 0; i < compactSize; ++i)
        entries[i].setKey(0);
    for (int i = 0; values[i].key; ++i) {
        StringImpl* identifier = Identifier::add(&vm, values[i].key).leakRef();
        int hashIndex = identifier->existingHash() & compactHashSizeMask;
        HashEntry* entry = &entries[hashIndex];

        if (entry->key()) {
            while (entry->next()) {
                entry = entry->next();
            }
            ASSERT(linkIndex < compactSize);
            entry->setNext(&entries[linkIndex++]);
            entry = entry->next();
        }

        entry->initialize(identifier, values[i].attributes, values[i].value1, values[i].value2, values[i].intrinsic);
    }
    table = entries;
}

void HashTable::deleteTable() const
{
    if (table) {
        int max = compactSize;
        for (int i = 0; i != max; ++i) {
            if (StringImpl* key = table[i].key())
                key->deref();
        }
        delete [] table;
        table = 0;
    }
}

bool setUpStaticFunctionSlot(ExecState* exec, const HashEntry* entry, JSObject* thisObj, PropertyName propertyName, PropertySlot& slot)
{
    ASSERT(thisObj->globalObject());
    ASSERT(entry->attributes() & Function);
    VM& vm = exec->vm();
    unsigned attributes;
    PropertyOffset offset = thisObj->getDirectOffset(vm, propertyName, attributes);

    if (!isValidOffset(offset)) {
        // If a property is ever deleted from an object with a static table, then we reify
        // all static functions at that time - after this we shouldn't be re-adding anything.
        if (thisObj->staticFunctionsReified())
            return false;
    
        thisObj->putDirectNativeFunction(
            vm, thisObj->globalObject(), propertyName, entry->functionLength(),
            entry->function(), entry->intrinsic(), entry->attributes());
        offset = thisObj->getDirectOffset(vm, propertyName, attributes);
        ASSERT(isValidOffset(offset));
    }

    slot.setValue(thisObj, attributes, thisObj->getDirect(offset), offset);
    return true;
}

} // namespace JSC