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-rw-r--r--devtools/shared/heapsnapshot/AutoMemMap.h75
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diff --git a/devtools/shared/heapsnapshot/AutoMemMap.h b/devtools/shared/heapsnapshot/AutoMemMap.h
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--- a/devtools/shared/heapsnapshot/AutoMemMap.h
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-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=8 sts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef mozilla_devtools_AutoMemMap_h
-#define mozilla_devtools_AutoMemMap_h
-
-#include <prio.h>
-#include "mozilla/GuardObjects.h"
-
-namespace mozilla {
-namespace devtools {
-
-// # AutoMemMap
-//
-// AutoMemMap is an RAII class to manage mapping a file to memory. It is a
-// wrapper aorund managing opening and closing a file and calling PR_MemMap and
-// PR_MemUnmap.
-//
-// Example usage:
-//
-// {
-// AutoMemMap mm;
-// if (NS_FAILED(mm.init("/path/to/desired/file"))) {
-// // Handle the error however you see fit.
-// return false;
-// }
-//
-// doStuffWithMappedMemory(mm.address());
-// }
-// // The memory is automatically unmapped when the AutoMemMap leaves scope.
-class MOZ_RAII AutoMemMap
-{
- MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER;
-
- PRFileInfo64 fileInfo;
- PRFileDesc* fd;
- PRFileMap* fileMap;
- void* addr;
-
- AutoMemMap(const AutoMemMap& aOther) = delete;
- void operator=(const AutoMemMap& aOther) = delete;
-
-public:
- explicit AutoMemMap(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM)
- : fd(nullptr)
- , fileMap(nullptr)
- , addr(nullptr)
- {
- MOZ_GUARD_OBJECT_NOTIFIER_INIT;
- };
- ~AutoMemMap();
-
- // Initialize this AutoMemMap.
- nsresult init(const char* filePath, int flags = PR_RDONLY, int mode = 0,
- PRFileMapProtect prot = PR_PROT_READONLY);
-
- // Get the size of the memory mapped file.
- uint32_t size() const {
- MOZ_ASSERT(fileInfo.size <= UINT32_MAX,
- "Should only call size() if init() succeeded.");
- return uint32_t(fileInfo.size);
- }
-
- // Get the mapped memory.
- void* address() { MOZ_ASSERT(addr); return addr; }
- const void* address() const { MOZ_ASSERT(addr); return addr; }
-};
-
-} // namespace devtools
-} // namespace mozilla
-
-#endif // mozilla_devtools_AutoMemMap_h