/*

 * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)

 *

 *  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 "ExecutableAllocator.h"

#if ENABLE(EXECUTABLE_ALLOCATOR_DEMAND) && OS(SYMBIAN)

#include <e32hal.h>

#include <e32std.h>

// Set the page size to 256 Kb to compensate for moving memory model limitation

const size_t MOVING_MEM_PAGE_SIZE = 256 * 1024; 

namespace JSC {

void ExecutableAllocator::intializePageSize()

{

#if CPU(ARMV5_OR_LOWER)

    // The moving memory model (as used in ARMv5 and earlier platforms)

    // on Symbian OS limits the number of chunks for each process to 16. 

    // To mitigate this limitation increase the pagesize to 

    // allocate less of larger chunks.

    ExecutableAllocator::pageSize = MOVING_MEM_PAGE_SIZE;

#else

    TInt page_size;

    UserHal::PageSizeInBytes(page_size);

    ExecutableAllocator::pageSize = page_size;

#endif

}

ExecutablePool::Allocation ExecutablePool::systemAlloc(size_t n)

{

    RChunk* codeChunk = new RChunk();

    TInt errorCode = codeChunk->CreateLocalCode(n, n);

    char* allocation = reinterpret_cast<char*>(codeChunk->Base());

    if (!allocation)

        CRASH();

    ExecutablePool::Allocation alloc = { allocation, n, codeChunk };

    return alloc;

}

void ExecutablePool::systemRelease(const ExecutablePool::Allocation& alloc)

{ 

    alloc.chunk->Close();

    delete alloc.chunk;

}

bool ExecutableAllocator::isValid() const

{

    return true;

}

#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)

#error "ASSEMBLER_WX_EXCLUSIVE not yet suported on this platform."

#endif

}

#endif // HAVE(ASSEMBLER)