Index: third_party/WebKit/Source/wtf/allocator/PageAllocator.h |
diff --git a/third_party/WebKit/Source/wtf/allocator/PageAllocator.h b/third_party/WebKit/Source/wtf/allocator/PageAllocator.h |
deleted file mode 100644 |
index 0942db55ed3b3a2d4a6b2908d77bbb945e032ba4..0000000000000000000000000000000000000000 |
--- a/third_party/WebKit/Source/wtf/allocator/PageAllocator.h |
+++ /dev/null |
@@ -1,153 +0,0 @@ |
-/* |
- * Copyright (C) 2013 Google 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: |
- * |
- * * Redistributions of source code must retain the above copyright |
- * notice, this list of conditions and the following disclaimer. |
- * * 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. |
- * * Neither the name of Google Inc. nor the names of its |
- * contributors may be used to endorse or promote products derived from |
- * this software without specific prior written permission. |
- * |
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT |
- * OWNER 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. |
- */ |
- |
-#ifndef WTF_PageAllocator_h |
-#define WTF_PageAllocator_h |
- |
-#include "wtf/Assertions.h" |
-#include "wtf/CPU.h" |
-#include "wtf/Compiler.h" |
-#include "wtf/WTFExport.h" |
-#include <cstddef> |
-#include <stdint.h> |
- |
-namespace WTF { |
- |
-#if OS(WIN) |
-static const size_t kPageAllocationGranularityShift = 16; // 64KB |
-#else |
-static const size_t kPageAllocationGranularityShift = 12; // 4KB |
-#endif |
-static const size_t kPageAllocationGranularity = |
- 1 << kPageAllocationGranularityShift; |
-static const size_t kPageAllocationGranularityOffsetMask = |
- kPageAllocationGranularity - 1; |
-static const size_t kPageAllocationGranularityBaseMask = |
- ~kPageAllocationGranularityOffsetMask; |
- |
-// All Blink-supported systems have 4096 sized system pages and can handle |
-// permissions and commit / decommit at this granularity. |
-static const size_t kSystemPageSize = 4096; |
-static const size_t kSystemPageOffsetMask = kSystemPageSize - 1; |
-static const size_t kSystemPageBaseMask = ~kSystemPageOffsetMask; |
- |
-enum PageAccessibilityConfiguration { |
- PageAccessible, |
- PageInaccessible, |
-}; |
- |
-// Allocate one or more pages. |
-// The requested address is just a hint; the actual address returned may |
-// differ. The returned address will be aligned at least to align bytes. |
-// len is in bytes, and must be a multiple of kPageAllocationGranularity. |
-// align is in bytes, and must be a power-of-two multiple of |
-// kPageAllocationGranularity. |
-// If addr is null, then a suitable and randomized address will be chosen |
-// automatically. |
-// PageAccessibilityConfiguration controls the permission of the |
-// allocated pages. |
-// This call will return null if the allocation cannot be satisfied. |
-WTF_EXPORT void* allocPages(void* addr, |
- size_t len, |
- size_t align, |
- PageAccessibilityConfiguration); |
- |
-// Free one or more pages. |
-// addr and len must match a previous call to allocPages(). |
-WTF_EXPORT void freePages(void* addr, size_t len); |
- |
-// Mark one or more system pages as being inaccessible. |
-// Subsequently accessing any address in the range will fault, and the |
-// addresses will not be re-used by future allocations. |
-// len must be a multiple of kSystemPageSize bytes. |
-WTF_EXPORT void setSystemPagesInaccessible(void* addr, size_t len); |
- |
-// Mark one or more system pages as being accessible. |
-// The pages will be readable and writeable. |
-// len must be a multiple of kSystemPageSize bytes. |
-// The result bool value indicates whether the permission |
-// change succeeded or not. You must check the result |
-// (in most cases you need to RELEASE_ASSERT that it is |
-// true). |
-WTF_EXPORT WARN_UNUSED_RESULT bool setSystemPagesAccessible(void* addr, |
- size_t len); |
- |
-// Decommit one or more system pages. Decommitted means that the physical memory |
-// is released to the system, but the virtual address space remains reserved. |
-// System pages are re-committed by calling recommitSystemPages(). Touching |
-// a decommitted page _may_ fault. |
-// Clients should not make any assumptions about the contents of decommitted |
-// system pages, before or after they write to the page. The only guarantee |
-// provided is that the contents of the system page will be deterministic again |
-// after recommitting and writing to it. In particlar note that system pages are |
-// not guaranteed to be zero-filled upon re-commit. len must be a multiple of |
-// kSystemPageSize bytes. |
-WTF_EXPORT void decommitSystemPages(void* addr, size_t len); |
- |
-// Recommit one or more system pages. Decommitted system pages must be |
-// recommitted before they are read are written again. |
-// Note that this operation may be a no-op on some platforms. |
-// len must be a multiple of kSystemPageSize bytes. |
-WTF_EXPORT void recommitSystemPages(void* addr, size_t len); |
- |
-// Discard one or more system pages. Discarding is a hint to the system that |
-// the page is no longer required. The hint may: |
-// - Do nothing. |
-// - Discard the page immediately, freeing up physical pages. |
-// - Discard the page at some time in the future in response to memory pressure. |
-// Only committed pages should be discarded. Discarding a page does not |
-// decommit it, and it is valid to discard an already-discarded page. |
-// A read or write to a discarded page will not fault. |
-// Reading from a discarded page may return the original page content, or a |
-// page full of zeroes. |
-// Writing to a discarded page is the only guaranteed way to tell the system |
-// that the page is required again. Once written to, the content of the page is |
-// guaranteed stable once more. After being written to, the page content may be |
-// based on the original page content, or a page of zeroes. |
-// len must be a multiple of kSystemPageSize bytes. |
-WTF_EXPORT void discardSystemPages(void* addr, size_t len); |
- |
-WTF_EXPORT ALWAYS_INLINE uintptr_t roundUpToSystemPage(uintptr_t address) { |
- return (address + kSystemPageOffsetMask) & kSystemPageBaseMask; |
-} |
- |
-WTF_EXPORT ALWAYS_INLINE uintptr_t roundDownToSystemPage(uintptr_t address) { |
- return address & kSystemPageBaseMask; |
-} |
- |
-// Only allowed inside WTF for investigating WTF::initializeWithoutV8 crashes. |
-// Guess, the function fails because of mmap (or VirtualAlloc) failure. |
-// The following function returns errno (or GetLastError code) when mmap |
-// (or VirtualAlloc) fails. |
-uint32_t getAllocPageErrorCode(); |
- |
-} // namespace WTF |
- |
-#endif // WTF_PageAllocator_h |