1 /*

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

     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, 

    17  *  Boston, MA  02110-1301  USA

    18  *

    19  */

    20 

    21 #include "config.h"

    22 

    23 #include "ExecutableAllocator.h"

    24 

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

    26 

    27 #include <e32hal.h>

    28 #include <e32std.h>

    29 

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

    31 const size_t MOVING_MEM_PAGE_SIZE = 256 * 1024; 

    32 

    33 namespace JSC {

    34 

    35 void ExecutableAllocator::intializePageSize()

    36 {

    37 #if CPU(ARMV5_OR_LOWER)

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

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

    40     // To mitigate this limitation increase the pagesize to 

    41     // allocate less of larger chunks.

    42     ExecutableAllocator::pageSize = MOVING_MEM_PAGE_SIZE;

    43 #else

    44     TInt page_size;

    45     UserHal::PageSizeInBytes(page_size);

    46     ExecutableAllocator::pageSize = page_size;

    47 #endif

    48 }

    49 

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

    51 {

    52     RChunk* codeChunk = new RChunk();

    53 

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

    55 

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

    57     if (!allocation)

    58         CRASH();

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

    60     return alloc;

    61 }

    62 

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

    64 { 

    65     alloc.chunk->Close();

    66     delete alloc.chunk;

    67 }

    68 

    69 bool ExecutableAllocator::isValid() const

    70 {

    71     return true;

    72 }

    73 

    74 #if ENABLE(ASSEMBLER_WX_EXCLUSIVE)

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

    76 #endif

    77 

    78 }

    79 

    80 #endif // HAVE(ASSEMBLER)