Index: Source/WTF/wtf/OSAllocatorPosix.cpp |
diff --git a/Source/WTF/wtf/OSAllocatorPosix.cpp b/Source/WTF/wtf/OSAllocatorPosix.cpp |
deleted file mode 100644 |
index 44698cf9ffda0ec7828d480ab4d31a93885bccc8..0000000000000000000000000000000000000000 |
--- a/Source/WTF/wtf/OSAllocatorPosix.cpp |
+++ /dev/null |
@@ -1,189 +0,0 @@ |
-/* |
- * Copyright (C) 2010 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. AND ITS CONTRIBUTORS ``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 ITS 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 "OSAllocator.h" |
- |
-#if OS(UNIX) |
- |
-#include "PageAllocation.h" |
-#include <errno.h> |
-#include <sys/mman.h> |
-#include <wtf/Assertions.h> |
-#include <wtf/UnusedParam.h> |
- |
-namespace WTF { |
- |
-void* OSAllocator::reserveUncommitted(size_t bytes, Usage usage, bool writable, bool executable, bool includesGuardPages) |
-{ |
-#if OS(QNX) |
- // Reserve memory with PROT_NONE and MAP_LAZY so it isn't committed now. |
- void* result = mmap(0, bytes, PROT_NONE, MAP_LAZY | MAP_PRIVATE | MAP_ANON, -1, 0); |
- if (result == MAP_FAILED) |
- CRASH(); |
-#elif OS(LINUX) |
- UNUSED_PARAM(usage); |
- UNUSED_PARAM(writable); |
- UNUSED_PARAM(executable); |
- UNUSED_PARAM(includesGuardPages); |
- |
- void* result = mmap(0, bytes, PROT_NONE, MAP_NORESERVE | MAP_PRIVATE | MAP_ANON, -1, 0); |
- if (result == MAP_FAILED) |
- CRASH(); |
- madvise(result, bytes, MADV_DONTNEED); |
-#else |
- void* result = reserveAndCommit(bytes, usage, writable, executable, includesGuardPages); |
-#if HAVE(MADV_FREE_REUSE) |
- // To support the "reserve then commit" model, we have to initially decommit. |
- while (madvise(result, bytes, MADV_FREE_REUSABLE) == -1 && errno == EAGAIN) { } |
-#endif |
- |
-#endif // OS(QNX) |
- |
- return result; |
-} |
- |
-void* OSAllocator::reserveAndCommit(size_t bytes, Usage usage, bool writable, bool executable, bool includesGuardPages) |
-{ |
- // All POSIX reservations start out logically committed. |
- int protection = PROT_READ; |
- if (writable) |
- protection |= PROT_WRITE; |
- if (executable) |
- protection |= PROT_EXEC; |
- |
- int flags = MAP_PRIVATE | MAP_ANON; |
- |
-#if OS(DARWIN) |
- int fd = usage; |
-#else |
- UNUSED_PARAM(usage); |
- int fd = -1; |
-#endif |
- |
- void* result = 0; |
-#if (OS(DARWIN) && CPU(X86_64)) |
- if (executable) { |
- ASSERT(includesGuardPages); |
- // Cook up an address to allocate at, using the following recipe: |
- // 17 bits of zero, stay in userspace kids. |
- // 26 bits of randomness for ASLR. |
- // 21 bits of zero, at least stay aligned within one level of the pagetables. |
- // |
- // But! - as a temporary workaround for some plugin problems (rdar://problem/6812854), |
- // for now instead of 2^26 bits of ASLR lets stick with 25 bits of randomization plus |
- // 2^24, which should put up somewhere in the middle of userspace (in the address range |
- // 0x200000000000 .. 0x5fffffffffff). |
- intptr_t randomLocation = 0; |
- randomLocation = arc4random() & ((1 << 25) - 1); |
- randomLocation += (1 << 24); |
- randomLocation <<= 21; |
- result = reinterpret_cast<void*>(randomLocation); |
- } |
-#endif |
- |
- result = mmap(result, bytes, protection, flags, fd, 0); |
- if (result == MAP_FAILED) { |
-#if ENABLE(LLINT) |
- if (executable) |
- result = 0; |
- else |
-#endif |
- CRASH(); |
- } |
- if (result && includesGuardPages) { |
- // We use mmap to remap the guardpages rather than using mprotect as |
- // mprotect results in multiple references to the code region. This |
- // breaks the madvise based mechanism we use to return physical memory |
- // to the OS. |
- mmap(result, pageSize(), PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON, fd, 0); |
- mmap(static_cast<char*>(result) + bytes - pageSize(), pageSize(), PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON, fd, 0); |
- } |
- return result; |
-} |
- |
-void OSAllocator::commit(void* address, size_t bytes, bool writable, bool executable) |
-{ |
-#if OS(QNX) |
- int protection = PROT_READ; |
- if (writable) |
- protection |= PROT_WRITE; |
- if (executable) |
- protection |= PROT_EXEC; |
- if (MAP_FAILED == mmap(address, bytes, protection, MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0)) |
- CRASH(); |
-#elif OS(LINUX) |
- int protection = PROT_READ; |
- if (writable) |
- protection |= PROT_WRITE; |
- if (executable) |
- protection |= PROT_EXEC; |
- if (mprotect(address, bytes, protection)) |
- CRASH(); |
- madvise(address, bytes, MADV_WILLNEED); |
-#elif HAVE(MADV_FREE_REUSE) |
- UNUSED_PARAM(writable); |
- UNUSED_PARAM(executable); |
- while (madvise(address, bytes, MADV_FREE_REUSE) == -1 && errno == EAGAIN) { } |
-#else |
- // Non-MADV_FREE_REUSE reservations automatically commit on demand. |
- UNUSED_PARAM(address); |
- UNUSED_PARAM(bytes); |
- UNUSED_PARAM(writable); |
- UNUSED_PARAM(executable); |
-#endif |
-} |
- |
-void OSAllocator::decommit(void* address, size_t bytes) |
-{ |
-#if OS(QNX) |
- // Use PROT_NONE and MAP_LAZY to decommit the pages. |
- mmap(address, bytes, PROT_NONE, MAP_FIXED | MAP_LAZY | MAP_PRIVATE | MAP_ANON, -1, 0); |
-#elif OS(LINUX) |
- madvise(address, bytes, MADV_DONTNEED); |
- if (mprotect(address, bytes, PROT_NONE)) |
- CRASH(); |
-#elif HAVE(MADV_FREE_REUSE) |
- while (madvise(address, bytes, MADV_FREE_REUSABLE) == -1 && errno == EAGAIN) { } |
-#elif HAVE(MADV_FREE) |
- while (madvise(address, bytes, MADV_FREE) == -1 && errno == EAGAIN) { } |
-#elif HAVE(MADV_DONTNEED) |
- while (madvise(address, bytes, MADV_DONTNEED) == -1 && errno == EAGAIN) { } |
-#else |
- UNUSED_PARAM(address); |
- UNUSED_PARAM(bytes); |
-#endif |
-} |
- |
-void OSAllocator::releaseDecommitted(void* address, size_t bytes) |
-{ |
- int result = munmap(address, bytes); |
- if (result == -1) |
- CRASH(); |
-} |
- |
-} // namespace WTF |
- |
-#endif // OS(UNIX) |