mirror of
https://github.com/mozilla/gecko-dev.git
synced 2025-11-12 06:08:24 +02:00
03c8e8c2dd
clang-format-8 upstream had some improvements wrt macros See: https://reviews.llvm.org/D33440 This is why the diff is bigger than usual # ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D26098 --HG-- extra : moz-landing-system : lando
101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
|
|
/* 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 loader_AutoMemMap_h
|
|
#define loader_AutoMemMap_h
|
|
|
|
#include "mozilla/FileUtils.h"
|
|
#include "mozilla/MemoryReporting.h"
|
|
#include "mozilla/RangedPtr.h"
|
|
#include "mozilla/Result.h"
|
|
#include "nsIMemoryReporter.h"
|
|
|
|
#include <prio.h>
|
|
|
|
class nsIFile;
|
|
|
|
namespace mozilla {
|
|
namespace ipc {
|
|
class FileDescriptor;
|
|
}
|
|
|
|
namespace loader {
|
|
|
|
class AutoMemMap {
|
|
typedef mozilla::ipc::FileDescriptor FileDescriptor;
|
|
|
|
public:
|
|
AutoMemMap() = default;
|
|
|
|
~AutoMemMap();
|
|
|
|
Result<Ok, nsresult> init(nsIFile* file, int flags = PR_RDONLY, int mode = 0,
|
|
PRFileMapProtect prot = PR_PROT_READONLY);
|
|
|
|
Result<Ok, nsresult> init(const FileDescriptor& file,
|
|
PRFileMapProtect prot = PR_PROT_READONLY,
|
|
size_t expectedSize = 0);
|
|
|
|
// Initializes the mapped memory with a shared memory handle. On
|
|
// Unix-like systems, this is identical to the above init() method. On
|
|
// Windows, the FileDescriptor must be a handle for a file mapping,
|
|
// rather than a file descriptor.
|
|
Result<Ok, nsresult> initWithHandle(const FileDescriptor& file, size_t size,
|
|
PRFileMapProtect prot = PR_PROT_READONLY);
|
|
|
|
void reset();
|
|
|
|
bool initialized() const { return addr; }
|
|
|
|
uint32_t size() const { return size_; }
|
|
|
|
template <typename T = void>
|
|
RangedPtr<T> get() {
|
|
MOZ_ASSERT(addr);
|
|
return {static_cast<T*>(addr), size_};
|
|
}
|
|
|
|
template <typename T = void>
|
|
const RangedPtr<T> get() const {
|
|
MOZ_ASSERT(addr);
|
|
return {static_cast<T*>(addr), size_};
|
|
}
|
|
|
|
size_t nonHeapSizeOfExcludingThis() { return size_; }
|
|
|
|
FileDescriptor cloneFileDescriptor() const;
|
|
FileDescriptor cloneHandle() const;
|
|
|
|
// Makes this mapping persistent. After calling this, the mapped memory
|
|
// will remained mapped, even after this instance is destroyed.
|
|
void setPersistent() { persistent_ = true; }
|
|
|
|
private:
|
|
Result<Ok, nsresult> initInternal(PRFileMapProtect prot = PR_PROT_READONLY,
|
|
size_t expectedSize = 0);
|
|
|
|
AutoFDClose fd;
|
|
PRFileMap* fileMap = nullptr;
|
|
|
|
#ifdef XP_WIN
|
|
// We can't include windows.h in this header, since it gets included
|
|
// by some binding headers (which are explicitly incompatible with
|
|
// windows.h). So we can't use the HANDLE type here.
|
|
void* handle_ = nullptr;
|
|
#endif
|
|
|
|
uint32_t size_ = 0;
|
|
void* addr = nullptr;
|
|
|
|
bool persistent_ = 0;
|
|
|
|
AutoMemMap(const AutoMemMap&) = delete;
|
|
void operator=(const AutoMemMap&) = delete;
|
|
};
|
|
|
|
} // namespace loader
|
|
} // namespace mozilla
|
|
|
|
#endif // loader_AutoMemMap_h
|