jit/ExecutableAllocatorSymbian.cpp

   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 #if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
  70 #error "ASSEMBLER_WX_EXCLUSIVE not yet suported on this platform."
  71 #endif
  72
  73 }
  74
  75 #endif // HAVE(ASSEMBLER)