mirror of
https://github.com/mozilla/gecko-dev.git
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87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef loader_AutoMemMap_h
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#define loader_AutoMemMap_h
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#include "mozilla/FileUtils.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/RangedPtr.h"
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#include "mozilla/Result.h"
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#include <prio.h>
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class nsIFile;
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namespace mozilla {
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namespace ipc {
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class FileDescriptor;
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}
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namespace loader {
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class AutoMemMap {
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typedef mozilla::ipc::FileDescriptor FileDescriptor;
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public:
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AutoMemMap() = default;
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~AutoMemMap();
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Result<Ok, nsresult> init(nsIFile* file, int flags = PR_RDONLY, int mode = 0,
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PRFileMapProtect prot = PR_PROT_READONLY);
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Result<Ok, nsresult> init(const FileDescriptor& file,
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PRFileMapProtect prot = PR_PROT_READONLY,
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size_t maybeSize = 0);
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void reset();
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bool initialized() const { return addr; }
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uint32_t size() const { return size_; }
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template <typename T = void>
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RangedPtr<T> get() {
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MOZ_ASSERT(addr);
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return {static_cast<T*>(addr), size_};
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}
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template <typename T = void>
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const RangedPtr<T> get() const {
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MOZ_ASSERT(addr);
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return {static_cast<T*>(addr), size_};
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}
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size_t nonHeapSizeOfExcludingThis() { return size_; }
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FileDescriptor cloneFileDescriptor() const;
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FileDescriptor cloneHandle() const;
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// Makes this mapping persistent. After calling this, the mapped memory
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// will remained mapped, even after this instance is destroyed.
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void setPersistent() { persistent_ = true; }
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private:
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Result<Ok, nsresult> initInternal(PRFileMapProtect prot,
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size_t maybeSize = 0);
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AutoFDClose fd;
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PRFileMap* fileMap = nullptr;
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uint32_t size_ = 0;
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void* addr = nullptr;
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bool persistent_ = 0;
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AutoMemMap(const AutoMemMap&) = delete;
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void operator=(const AutoMemMap&) = delete;
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};
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} // namespace loader
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} // namespace mozilla
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#endif // loader_AutoMemMap_h
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