JavaScriptCore-576.tar.gz

[apple/javascriptcore.git] / jit / ExecutableAllocatorSymbian.cpp

diff --git a/jit/ExecutableAllocatorSymbian.cpp b/jit/ExecutableAllocatorSymbian.cpp
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+/*
+ * 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(ASSEMBLER) && 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;
+}
+
+#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
+#error "ASSEMBLER_WX_EXCLUSIVE not yet suported on this platform."
+#endif
+
+}
+
+#endif // HAVE(ASSEMBLER)