forked from mirrors/gecko-dev
158 lines
3.9 KiB
C++
158 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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#include "AutoMemMap.h"
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#include "ScriptPreloader-inl.h"
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#include "mozilla/Unused.h"
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#include "mozilla/Try.h"
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#include "mozilla/ipc/FileDescriptor.h"
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#include "nsIFile.h"
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#include <private/pprio.h>
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namespace mozilla {
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namespace loader {
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using namespace mozilla::ipc;
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AutoMemMap::~AutoMemMap() { reset(); }
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FileDescriptor AutoMemMap::cloneFileDescriptor() const {
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if (fd.get()) {
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auto handle =
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FileDescriptor::PlatformHandleType(PR_FileDesc2NativeHandle(fd.get()));
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return FileDescriptor(handle);
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}
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return FileDescriptor();
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}
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Result<Ok, nsresult> AutoMemMap::init(nsIFile* file, int flags, int mode,
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PRFileMapProtect prot) {
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MOZ_ASSERT(!fd);
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MOZ_TRY(file->OpenNSPRFileDesc(flags, mode, getter_Transfers(fd)));
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return initInternal(prot);
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}
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Result<Ok, nsresult> AutoMemMap::init(const FileDescriptor& file,
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PRFileMapProtect prot, size_t maybeSize) {
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MOZ_ASSERT(!fd);
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if (!file.IsValid()) {
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return Err(NS_ERROR_INVALID_ARG);
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}
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auto handle = file.ClonePlatformHandle();
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fd.reset(PR_ImportFile(PROsfd(handle.get())));
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if (!fd) {
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return Err(NS_ERROR_FAILURE);
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}
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Unused << handle.release();
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return initInternal(prot, maybeSize);
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}
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Result<Ok, nsresult> AutoMemMap::initInternal(PRFileMapProtect prot,
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size_t maybeSize) {
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MOZ_ASSERT(!fileMap);
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MOZ_ASSERT(!addr);
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if (maybeSize > 0) {
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// Some OSes' shared memory objects can't be stat()ed, either at
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// all (Android) or without loosening the sandbox (Mac) so just
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// use the size.
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size_ = maybeSize;
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} else {
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// But if we don't have the size, assume it's a regular file and
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// ask for it.
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PRFileInfo64 fileInfo;
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MOZ_TRY(PR_GetOpenFileInfo64(fd.get(), &fileInfo));
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if (fileInfo.size > UINT32_MAX) {
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return Err(NS_ERROR_INVALID_ARG);
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}
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size_ = fileInfo.size;
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}
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fileMap = PR_CreateFileMap(fd.get(), 0, prot);
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if (!fileMap) {
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return Err(NS_ERROR_FAILURE);
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}
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addr = PR_MemMap(fileMap, 0, size_);
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if (!addr) {
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return Err(NS_ERROR_FAILURE);
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}
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return Ok();
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}
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#ifdef XP_WIN
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Result<Ok, nsresult> AutoMemMap::initWithHandle(const FileDescriptor& file,
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size_t size,
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PRFileMapProtect prot) {
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MOZ_ASSERT(!fd);
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MOZ_ASSERT(!handle_);
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if (!file.IsValid()) {
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return Err(NS_ERROR_INVALID_ARG);
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}
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handle_ = file.ClonePlatformHandle().release();
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MOZ_ASSERT(!addr);
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size_ = size;
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addr = MapViewOfFile(
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handle_, prot == PR_PROT_READONLY ? FILE_MAP_READ : FILE_MAP_ALL_ACCESS,
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0, 0, size);
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if (!addr) {
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return Err(NS_ERROR_FAILURE);
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}
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return Ok();
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}
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FileDescriptor AutoMemMap::cloneHandle() const {
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return FileDescriptor(handle_);
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}
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#else
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Result<Ok, nsresult> AutoMemMap::initWithHandle(const FileDescriptor& file,
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size_t size,
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PRFileMapProtect prot) {
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MOZ_DIAGNOSTIC_ASSERT(size > 0);
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return init(file, prot, size);
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}
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FileDescriptor AutoMemMap::cloneHandle() const { return cloneFileDescriptor(); }
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#endif
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void AutoMemMap::reset() {
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if (addr && !persistent_) {
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Unused << NS_WARN_IF(PR_MemUnmap(addr, size()) != PR_SUCCESS);
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addr = nullptr;
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}
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if (fileMap) {
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Unused << NS_WARN_IF(PR_CloseFileMap(fileMap) != PR_SUCCESS);
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fileMap = nullptr;
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}
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#ifdef XP_WIN
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if (handle_) {
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CloseHandle(handle_);
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handle_ = nullptr;
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}
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#endif
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fd = nullptr;
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}
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} // namespace loader
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} // namespace mozilla
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