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-rw-r--r--JavaScriptCore/jit/ExecutableAllocator.cpp128
1 files changed, 0 insertions, 128 deletions
diff --git a/JavaScriptCore/jit/ExecutableAllocator.cpp b/JavaScriptCore/jit/ExecutableAllocator.cpp
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--- a/JavaScriptCore/jit/ExecutableAllocator.cpp
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-/*
- * Copyright (C) 2008 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-
-#include "ExecutableAllocator.h"
-
-#if ENABLE(ASSEMBLER)
-
-namespace JSC {
-
-size_t ExecutableAllocator::pageSize = 0;
-
-#if ENABLE(EXECUTABLE_ALLOCATOR_DEMAND)
-
-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
- // fewer, larger chunks. Set the page size to 256 Kb to compensate
- // for moving memory model limitation
- ExecutableAllocator::pageSize = 256 * 1024;
-#else
- ExecutableAllocator::pageSize = WTF::pageSize();
-#endif
-}
-
-ExecutablePool::Allocation ExecutablePool::systemAlloc(size_t size)
-{
- PageAllocation allocation = PageAllocation::allocate(size, OSAllocator::JSJITCodePages, EXECUTABLE_POOL_WRITABLE, true);
- if (!allocation)
- CRASH();
- return allocation;
-}
-
-void ExecutablePool::systemRelease(ExecutablePool::Allocation& allocation)
-{
- allocation.deallocate();
-}
-
-bool ExecutableAllocator::isValid() const
-{
- return true;
-}
-
-bool ExecutableAllocator::underMemoryPressure()
-{
- return false;
-}
-
-size_t ExecutableAllocator::committedByteCount()
-{
- return 0;
-}
-
-#endif
-
-#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
-
-#if OS(WINDOWS) || OS(SYMBIAN)
-#error "ASSEMBLER_WX_EXCLUSIVE not yet suported on this platform."
-#endif
-
-void ExecutableAllocator::reprotectRegion(void* start, size_t size, ProtectionSeting setting)
-{
- if (!pageSize)
- intializePageSize();
-
- // Calculate the start of the page containing this region,
- // and account for this extra memory within size.
- intptr_t startPtr = reinterpret_cast<intptr_t>(start);
- intptr_t pageStartPtr = startPtr & ~(pageSize - 1);
- void* pageStart = reinterpret_cast<void*>(pageStartPtr);
- size += (startPtr - pageStartPtr);
-
- // Round size up
- size += (pageSize - 1);
- size &= ~(pageSize - 1);
-
- mprotect(pageStart, size, (setting == Writable) ? PROTECTION_FLAGS_RW : PROTECTION_FLAGS_RX);
-}
-
-#endif
-
-#if CPU(ARM_TRADITIONAL) && OS(LINUX) && COMPILER(RVCT)
-
-__asm void ExecutableAllocator::cacheFlush(void* code, size_t size)
-{
- ARM
- push {r7}
- add r1, r1, r0
- mov r7, #0xf0000
- add r7, r7, #0x2
- mov r2, #0x0
- svc #0x0
- pop {r7}
- bx lr
-}
-
-#endif
-
-}
-
-#endif // HAVE(ASSEMBLER)