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Bug 1770894 - Force update memmap2 to 0.3. r=emilio 

Differential Revision: https://phabricator.services.mozilla.com/D147255
This commit is contained in:
Mike Hommey 2022-05-30 21:37:35 +00:00
Родитель 4d1c26ec5d
Коммит f686964c71
17 изменённых файлов: 25 добавлений и 2456 удалений
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14
Cargo.lock сгенерированный
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@ -219,7 +219,7 @@ dependencies = [
"iovec",
"libc",
"log",
"memmap2 0.2.3",
"memmap2 0.2.999",
"mio 0.6.23",
"mio-named-pipes",
"mio-uds",
@ -278,7 +278,7 @@ dependencies = [
"iovec",
"libc",
"log",
"memmap2 0.2.3",
"memmap2 0.2.999",
"mio 0.8.0",
"scopeguard",
"serde",
@ -3018,7 +3018,7 @@ source = "git+https://github.com/jfkthame/mapped_hyph.git?rev=746743227485a83123
dependencies = [
"arrayref",
"log",
"memmap2 0.2.3",
"memmap2 0.2.999",
]
[[package]]
@ -3068,11 +3068,9 @@ checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
[[package]]
name = "memmap2"
version = "0.2.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "723e3ebdcdc5c023db1df315364573789f8857c11b631a2fdfad7c00f5c046b4"
version = "0.2.999"
dependencies = [
"libc",
"memmap2 0.3.1",
]
[[package]]
@ -3166,7 +3164,7 @@ dependencies = [
"byteorder",
"goblin",
"libc",
"memmap2 0.2.3",
"memmap2 0.2.999",
"memoffset 0.5.6",
"nix",
"tempfile",

3
Cargo.toml
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@ -108,6 +108,9 @@ itertools = { path = "build/rust/itertools" }
# Patch redox_users to an empty crate
redox_users = { path = "build/rust/redox_users" }
# Patch memmap2 0.2 to 0.3
memmap2 = { path = "build/rust/memmap2" }
# Patch autocfg to hide rustc output. Workaround for https://github.com/cuviper/autocfg/issues/30
autocfg = { path = "third_party/rust/autocfg" }

11
build/rust/memmap2/Cargo.toml Normal file
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@ -0,0 +1,11 @@
[package]
name = "memmap2"
version = "0.2.999"
edition = "2018"
license = "MPL-2.0"
[lib]
path = "lib.rs"
[dependencies]
memmap2 = "0.3"

5
build/rust/memmap2/lib.rs Normal file
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@ -0,0 +1,5 @@
/* 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/. */
pub use memmap2::*;

1
python/mozbuild/mozbuild/vendor/vendor_rust.py поставляемый
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@ -81,7 +81,6 @@ TOLERATED_DUPES = {
"crossbeam-utils": 3,
"futures": 2,
"libloading": 2,
"memmap2": 2,
"memoffset": 2,
"mio": 2,
"pin-project-lite": 2,

1
third_party/rust/memmap2-0.2.3/.cargo-checksum.json поставляемый
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47
third_party/rust/memmap2-0.2.3/CHANGELOG.md поставляемый
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@ -1,47 +0,0 @@
# Change Log
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](http://keepachangelog.com/)
and this project adheres to [Semantic Versioning](http://semver.org/).
## [Unreleased]
## [0.2.3] - 2021-05-24
### Added
- Allow compilation on unsupported platform.
The code will panic on access just like in `std`.
[@jcaesar](https://github.com/jcaesar)
## [0.2.2] - 2021-04-03
### Added
- `MmapOptions::populate`. [@adamreichold](https://github.com/adamreichold)
### Fixed
- Fix alignment computation for `flush_async` to match `flush`.
[@adamreichold](https://github.com/adamreichold)
## [0.2.1] - 2021-02-08
### Added
- `MmapOptions::map_raw` and `MmapRaw`. [@diwic](https://github.com/diwic)
## [0.2.0] - 2020-12-19
### Changed
- MSRV is 1.31 now (edition 2018).
- Make anonymous memory maps private by default on unix. [@CensoredUsername](https://github.com/CensoredUsername)
- Add `map_copy_read_only`. [@zserik](https://github.com/zserik)
## 0.1.0 - 2020-01-18
### Added
- Fork [memmap-rs](https://github.com/danburkert/memmap-rs).
### Changed
- Use `LICENSE-APACHE` instead of `README.md` for some tests since it's immutable.
### Removed
- `winapi` dependency. [memmap-rs/pull/89](https://github.com/danburkert/memmap-rs/pull/89)
[Unreleased]: https://github.com/RazrFalcon/memmap2-rs/compare/v0.2.3...HEAD
[0.2.3]: https://github.com/RazrFalcon/memmap2-rs/compare/v0.2.2...v0.2.3
[0.2.2]: https://github.com/RazrFalcon/memmap2-rs/compare/v0.2.1...v0.2.2
[0.2.1]: https://github.com/RazrFalcon/memmap2-rs/compare/v0.2.0...v0.2.1
[0.2.0]: https://github.com/RazrFalcon/memmap2-rs/compare/v0.1.0...v0.2.0

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third_party/rust/memmap2-0.2.3/Cargo.lock сгенерированный поставляемый
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26
third_party/rust/memmap2-0.2.3/Cargo.toml поставляемый
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@ -1,26 +0,0 @@
# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies
#
# If you believe there's an error in this file please file an
# issue against the rust-lang/cargo repository. If you're
# editing this file be aware that the upstream Cargo.toml
# will likely look very different (and much more reasonable)
[package]
edition = "2018"
name = "memmap2"
version = "0.2.3"
authors = ["Dan Burkert <dan@danburkert.com>", "Evgeniy Reizner <razrfalcon@gmail.com>"]
description = "Cross-platform Rust API for memory-mapped file IO"
documentation = "https://docs.rs/memmap2"
keywords = ["mmap", "memory-map", "io", "file"]
license = "MIT/Apache-2.0"
repository = "https://github.com/RazrFalcon/memmap2-rs"
[dev-dependencies.tempdir]
version = "0.3"
[target."cfg(unix)".dependencies.libc]
version = "0.2"

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third_party/rust/memmap2-0.2.3/LICENSE-APACHE поставляемый
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@ -1,201 +0,0 @@
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@ -1,26 +0,0 @@
Copyright (c) 2020 Evgeniy Reizner
Copyright (c) 2015 Dan Burkert
Permission is hereby granted, free of charge, to any
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33
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@ -1,33 +0,0 @@
# memmap2
![Build Status](https://github.com/RazrFalcon/memmap2-rs/workflows/Rust/badge.svg)
[![Crates.io](https://img.shields.io/crates/v/memmap2.svg)](https://crates.io/crates/memmap2)
[![Documentation](https://docs.rs/memmap2/badge.svg)](https://docs.rs/memmap2)
[![Rust 1.31+](https://img.shields.io/badge/rust-1.31+-orange.svg)](https://www.rust-lang.org)
A Rust library for cross-platform memory mapped IO.
This is a **fork** of the [memmap-rs](https://github.com/danburkert/memmap-rs) crate.
## Features
- [x] file-backed memory maps
- [x] anonymous memory maps
- [x] synchronous and asynchronous flushing
- [x] copy-on-write memory maps
- [x] read-only memory maps
- [x] stack support (`MAP_STACK` on unix)
- [x] executable memory maps
- [ ] huge page support
A list of supported/tested targets can be found in [Actions](https://github.com/RazrFalcon/memmap2-rs/actions).
## License
`memmap2` is primarily distributed under the terms of both the MIT license and the
Apache License (Version 2.0).
See [LICENSE-APACHE](LICENSE-APACHE), [LICENSE-MIT](LICENSE-MIT) for details.
Copyright (c) 2020 Evgeniy Reizner
Copyright (c) 2015 Dan Burkert

23
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extern crate memmap2;
use std::env;
use std::fs::File;
use std::io::{self, Write};
use memmap2::Mmap;
/// Output a file's contents to stdout. The file path must be provided as the first process
/// argument.
fn main() {
let path = env::args()
.nth(1)
.expect("supply a single path as the program argument");
let file = File::open(path).expect("failed to open the file");
let mmap = unsafe { Mmap::map(&file).expect("failed to map the file") };
io::stdout()
.write_all(&mmap[..])
.expect("failed to output the file contents");
}

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use std::fs::File;
use std::io;
pub struct MmapInner {
// Private member to prevent external construction
// (might be nice to change the type to ! once that's stable)
__: (),
}
impl MmapInner {
fn new() -> io::Result<MmapInner> {
Err(io::Error::new(
io::ErrorKind::Other,
"platform not supported",
))
}
pub fn map(_: usize, _: &File, _: u64) -> io::Result<MmapInner> {
MmapInner::new()
}
pub fn map_exec(_: usize, _: &File, _: u64) -> io::Result<MmapInner> {
MmapInner::new()
}
pub fn map_mut(_: usize, _: &File, _: u64) -> io::Result<MmapInner> {
MmapInner::new()
}
pub fn map_copy(_: usize, _: &File, _: u64) -> io::Result<MmapInner> {
MmapInner::new()
}
pub fn map_copy_read_only(_: usize, _: &File, _: u64) -> io::Result<MmapInner> {
MmapInner::new()
}
pub fn map_anon(_: usize, _: bool) -> io::Result<MmapInner> {
MmapInner::new()
}
pub fn flush(&self, _: usize, _: usize) -> io::Result<()> {
unreachable!("self unconstructable");
}
pub fn flush_async(&self, _: usize, _: usize) -> io::Result<()> {
unreachable!("self unconstructable");
}
pub fn make_read_only(&mut self) -> io::Result<()> {
unreachable!("self unconstructable");
}
pub fn make_exec(&mut self) -> io::Result<()> {
unreachable!("self unconstructable");
}
pub fn make_mut(&mut self) -> io::Result<()> {
unreachable!("self unconstructable");
}
#[inline]
pub fn ptr(&self) -> *const u8 {
unreachable!("self unconstructable");
}
#[inline]
pub fn mut_ptr(&mut self) -> *mut u8 {
unreachable!("self unconstructable");
}
#[inline]
pub fn len(&self) -> usize {
unreachable!("self unconstructable");
}
}

235
third_party/rust/memmap2-0.2.3/src/unix.rs поставляемый
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@ -1,235 +0,0 @@
extern crate libc;
use std::fs::File;
use std::os::unix::io::{AsRawFd, RawFd};
use std::{io, ptr};
#[cfg(any(
all(target_os = "linux", not(target_arch = "mips")),
target_os = "freebsd",
target_os = "android"
))]
const MAP_STACK: libc::c_int = libc::MAP_STACK;
#[cfg(not(any(
all(target_os = "linux", not(target_arch = "mips")),
target_os = "freebsd",
target_os = "android"
)))]
const MAP_STACK: libc::c_int = 0;
#[cfg(any(target_os = "linux", target_os = "android"))]
const MAP_POPULATE: libc::c_int = libc::MAP_POPULATE;
#[cfg(not(any(target_os = "linux", target_os = "android")))]
const MAP_POPULATE: libc::c_int = 0;
pub struct MmapInner {
ptr: *mut libc::c_void,
len: usize,
}
impl MmapInner {
/// Creates a new `MmapInner`.
///
/// This is a thin wrapper around the `mmap` sytem call.
fn new(
len: usize,
prot: libc::c_int,
flags: libc::c_int,
file: RawFd,
offset: u64,
) -> io::Result<MmapInner> {
let alignment = offset % page_size() as u64;
let aligned_offset = offset - alignment;
let aligned_len = len + alignment as usize;
if aligned_len == 0 {
// Normally the OS would catch this, but it segfaults under QEMU.
return Err(io::Error::new(
io::ErrorKind::InvalidInput,
"memory map must have a non-zero length",
));
}
unsafe {
let ptr = libc::mmap(
ptr::null_mut(),
aligned_len as libc::size_t,
prot,
flags,
file,
aligned_offset as libc::off_t,
);
if ptr == libc::MAP_FAILED {
Err(io::Error::last_os_error())
} else {
Ok(MmapInner {
ptr: ptr.offset(alignment as isize),
len,
})
}
}
}
pub fn map(len: usize, file: &File, offset: u64, populate: bool) -> io::Result<MmapInner> {
let populate = if populate { MAP_POPULATE } else { 0 };
MmapInner::new(
len,
libc::PROT_READ,
libc::MAP_SHARED | populate,
file.as_raw_fd(),
offset,
)
}
pub fn map_exec(len: usize, file: &File, offset: u64, populate: bool) -> io::Result<MmapInner> {
let populate = if populate { MAP_POPULATE } else { 0 };
MmapInner::new(
len,
libc::PROT_READ | libc::PROT_EXEC,
libc::MAP_SHARED | populate,
file.as_raw_fd(),
offset,
)
}
pub fn map_mut(len: usize, file: &File, offset: u64, populate: bool) -> io::Result<MmapInner> {
let populate = if populate { MAP_POPULATE } else { 0 };
MmapInner::new(
len,
libc::PROT_READ | libc::PROT_WRITE,
libc::MAP_SHARED | populate,
file.as_raw_fd(),
offset,
)
}
pub fn map_copy(len: usize, file: &File, offset: u64, populate: bool) -> io::Result<MmapInner> {
let populate = if populate { MAP_POPULATE } else { 0 };
MmapInner::new(
len,
libc::PROT_READ | libc::PROT_WRITE,
libc::MAP_PRIVATE | populate,
file.as_raw_fd(),
offset,
)
}
pub fn map_copy_read_only(
len: usize,
file: &File,
offset: u64,
populate: bool,
) -> io::Result<MmapInner> {
let populate = if populate { MAP_POPULATE } else { 0 };
MmapInner::new(
len,
libc::PROT_READ,
libc::MAP_PRIVATE | populate,
file.as_raw_fd(),
offset,
)
}
/// Open an anonymous memory map.
pub fn map_anon(len: usize, stack: bool) -> io::Result<MmapInner> {
let stack = if stack { MAP_STACK } else { 0 };
MmapInner::new(
len,
libc::PROT_READ | libc::PROT_WRITE,
libc::MAP_PRIVATE | libc::MAP_ANON | stack,
-1,
0,
)
}
pub fn flush(&self, offset: usize, len: usize) -> io::Result<()> {
let alignment = (self.ptr as usize + offset) % page_size();
let offset = offset as isize - alignment as isize;
let len = len + alignment;
let result =
unsafe { libc::msync(self.ptr.offset(offset), len as libc::size_t, libc::MS_SYNC) };
if result == 0 {
Ok(())
} else {
Err(io::Error::last_os_error())
}
}
pub fn flush_async(&self, offset: usize, len: usize) -> io::Result<()> {
let alignment = (self.ptr as usize + offset) % page_size();
let offset = offset as isize - alignment as isize;
let len = len + alignment;
let result =
unsafe { libc::msync(self.ptr.offset(offset), len as libc::size_t, libc::MS_ASYNC) };
if result == 0 {
Ok(())
} else {
Err(io::Error::last_os_error())
}
}
fn mprotect(&mut self, prot: libc::c_int) -> io::Result<()> {
unsafe {
let alignment = self.ptr as usize % page_size();
let ptr = self.ptr.offset(-(alignment as isize));
let len = self.len + alignment;
if libc::mprotect(ptr, len, prot) == 0 {
Ok(())
} else {
Err(io::Error::last_os_error())
}
}
}
pub fn make_read_only(&mut self) -> io::Result<()> {
self.mprotect(libc::PROT_READ)
}
pub fn make_exec(&mut self) -> io::Result<()> {
self.mprotect(libc::PROT_READ | libc::PROT_EXEC)
}
pub fn make_mut(&mut self) -> io::Result<()> {
self.mprotect(libc::PROT_READ | libc::PROT_WRITE)
}
#[inline]
pub fn ptr(&self) -> *const u8 {
self.ptr as *const u8
}
#[inline]
pub fn mut_ptr(&mut self) -> *mut u8 {
self.ptr as *mut u8
}
#[inline]
pub fn len(&self) -> usize {
self.len
}
}
impl Drop for MmapInner {
fn drop(&mut self) {
let alignment = self.ptr as usize % page_size();
unsafe {
assert!(
libc::munmap(
self.ptr.offset(-(alignment as isize)),
(self.len + alignment) as libc::size_t
) == 0,
"unable to unmap mmap: {}",
io::Error::last_os_error()
);
}
}
}
unsafe impl Sync for MmapInner {}
unsafe impl Send for MmapInner {}
fn page_size() -> usize {
unsafe { libc::sysconf(libc::_SC_PAGESIZE) as usize }
}

436
third_party/rust/memmap2-0.2.3/src/windows.rs поставляемый
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@ -1,436 +0,0 @@
#![allow(non_camel_case_types)]
#![allow(non_snake_case)]
use std::fs::File;
use std::os::raw::c_void;
use std::os::windows::io::{AsRawHandle, RawHandle};
use std::{io, mem, ptr};
type BOOL = i32;
type WORD = u16;
type DWORD = u32;
type WCHAR = u16;
type HANDLE = *mut c_void;
type LPVOID = *mut c_void;
type LPCVOID = *const c_void;
type ULONG_PTR = usize;
type SIZE_T = ULONG_PTR;
type LPCWSTR = *const WCHAR;
type PDWORD = *mut DWORD;
type DWORD_PTR = ULONG_PTR;
type LPSECURITY_ATTRIBUTES = *mut SECURITY_ATTRIBUTES;
type LPSYSTEM_INFO = *mut SYSTEM_INFO;
const INVALID_HANDLE_VALUE: HANDLE = -1isize as HANDLE;
const STANDARD_RIGHTS_REQUIRED: DWORD = 0x000F0000;
const SECTION_QUERY: DWORD = 0x0001;
const SECTION_MAP_WRITE: DWORD = 0x0002;
const SECTION_MAP_READ: DWORD = 0x0004;
const SECTION_MAP_EXECUTE: DWORD = 0x0008;
const SECTION_EXTEND_SIZE: DWORD = 0x0010;
const SECTION_MAP_EXECUTE_EXPLICIT: DWORD = 0x0020;
const SECTION_ALL_ACCESS: DWORD = STANDARD_RIGHTS_REQUIRED
| SECTION_QUERY
| SECTION_MAP_WRITE
| SECTION_MAP_READ
| SECTION_MAP_EXECUTE
| SECTION_EXTEND_SIZE;
const PAGE_READONLY: DWORD = 0x02;
const PAGE_READWRITE: DWORD = 0x04;
const PAGE_WRITECOPY: DWORD = 0x08;
const PAGE_EXECUTE_READ: DWORD = 0x20;
const PAGE_EXECUTE_READWRITE: DWORD = 0x40;
const PAGE_EXECUTE_WRITECOPY: DWORD = 0x80;
const FILE_MAP_WRITE: DWORD = SECTION_MAP_WRITE;
const FILE_MAP_READ: DWORD = SECTION_MAP_READ;
const FILE_MAP_ALL_ACCESS: DWORD = SECTION_ALL_ACCESS;
const FILE_MAP_EXECUTE: DWORD = SECTION_MAP_EXECUTE_EXPLICIT;
const FILE_MAP_COPY: DWORD = 0x00000001;
#[repr(C)]
#[derive(Clone, Copy)]
struct SECURITY_ATTRIBUTES {
nLength: DWORD,
lpSecurityDescriptor: LPVOID,
bInheritHandle: BOOL,
}
#[repr(C)]
#[derive(Clone, Copy)]
struct SYSTEM_INFO_u_s {
wProcessorArchitecture: WORD,
wReserved: WORD,
}
#[repr(C)]
#[derive(Clone, Copy)]
struct SYSTEM_INFO_u([u32; 1]);
#[repr(C)]
#[derive(Clone, Copy)]
struct SYSTEM_INFO {
u: SYSTEM_INFO_u,
dwPageSize: DWORD,
lpMinimumApplicationAddress: LPVOID,
lpMaximumApplicationAddress: LPVOID,
dwActiveProcessorMask: DWORD_PTR,
dwNumberOfProcessors: DWORD,
dwProcessorType: DWORD,
dwAllocationGranularity: DWORD,
wProcessorLevel: WORD,
wProcessorRevision: WORD,
}
extern "system" {
fn CloseHandle(hObject: HANDLE) -> BOOL;
fn CreateFileMappingW(
hFile: HANDLE,
lpFileMappingAttributes: LPSECURITY_ATTRIBUTES,
flProtect: DWORD,
dwMaximumSizeHigh: DWORD,
dwMaximumSizeLow: DWORD,
lpName: LPCWSTR,
) -> HANDLE;
fn FlushViewOfFile(lpBaseAddress: LPCVOID, dwNumberOfBytesToFlush: SIZE_T) -> BOOL;
fn UnmapViewOfFile(lpBaseAddress: LPCVOID) -> BOOL;
fn MapViewOfFile(
hFileMappingObject: HANDLE,
dwDesiredAccess: DWORD,
dwFileOffsetHigh: DWORD,
dwFileOffsetLow: DWORD,
dwNumberOfBytesToMap: SIZE_T,
) -> LPVOID;
fn VirtualProtect(
lpAddress: LPVOID,
dwSize: SIZE_T,
flNewProtect: DWORD,
lpflOldProtect: PDWORD,
) -> BOOL;
fn GetSystemInfo(lpSystemInfo: LPSYSTEM_INFO);
}
pub struct MmapInner {
file: Option<File>,
ptr: *mut c_void,
len: usize,
copy: bool,
}
impl MmapInner {
/// Creates a new `MmapInner`.
///
/// This is a thin wrapper around the `CreateFileMappingW` and `MapViewOfFile` system calls.
pub fn new(
file: &File,
protect: DWORD,
access: DWORD,
offset: u64,
len: usize,
copy: bool,
) -> io::Result<MmapInner> {
let alignment = offset % allocation_granularity() as u64;
let aligned_offset = offset - alignment as u64;
let aligned_len = len + alignment as usize;
unsafe {
let handle = CreateFileMappingW(
file.as_raw_handle(),
ptr::null_mut(),
protect,
0,
0,
ptr::null(),
);
if handle.is_null() {
return Err(io::Error::last_os_error());
}
let ptr = MapViewOfFile(
handle,
access,
(aligned_offset >> 16 >> 16) as DWORD,
(aligned_offset & 0xffffffff) as DWORD,
aligned_len as SIZE_T,
);
CloseHandle(handle);
if ptr.is_null() {
Err(io::Error::last_os_error())
} else {
Ok(MmapInner {
file: Some(file.try_clone()?),
ptr: ptr.offset(alignment as isize),
len: len as usize,
copy,
})
}
}
}
pub fn map(len: usize, file: &File, offset: u64, _populate: bool) -> io::Result<MmapInner> {
let write = protection_supported(file.as_raw_handle(), PAGE_READWRITE);
let exec = protection_supported(file.as_raw_handle(), PAGE_EXECUTE_READ);
let mut access = FILE_MAP_READ;
let protection = match (write, exec) {
(true, true) => {
access |= FILE_MAP_WRITE | FILE_MAP_EXECUTE;
PAGE_EXECUTE_READWRITE
}
(true, false) => {
access |= FILE_MAP_WRITE;
PAGE_READWRITE
}
(false, true) => {
access |= FILE_MAP_EXECUTE;
PAGE_EXECUTE_READ
}
(false, false) => PAGE_READONLY,
};
let mut inner = MmapInner::new(file, protection, access, offset, len, false)?;
if write || exec {
inner.make_read_only()?;
}
Ok(inner)
}
pub fn map_exec(
len: usize,
file: &File,
offset: u64,
_populate: bool,
) -> io::Result<MmapInner> {
let write = protection_supported(file.as_raw_handle(), PAGE_READWRITE);
let mut access = FILE_MAP_READ | FILE_MAP_EXECUTE;
let protection = if write {
access |= FILE_MAP_WRITE;
PAGE_EXECUTE_READWRITE
} else {
PAGE_EXECUTE_READ
};
let mut inner = MmapInner::new(file, protection, access, offset, len, false)?;
if write {
inner.make_exec()?;
}
Ok(inner)
}
pub fn map_mut(len: usize, file: &File, offset: u64, _populate: bool) -> io::Result<MmapInner> {
let exec = protection_supported(file.as_raw_handle(), PAGE_EXECUTE_READ);
let mut access = FILE_MAP_READ | FILE_MAP_WRITE;
let protection = if exec {
access |= FILE_MAP_EXECUTE;
PAGE_EXECUTE_READWRITE
} else {
PAGE_READWRITE
};
let mut inner = MmapInner::new(file, protection, access, offset, len, false)?;
if exec {
inner.make_mut()?;
}
Ok(inner)
}
pub fn map_copy(
len: usize,
file: &File,
offset: u64,
_populate: bool,
) -> io::Result<MmapInner> {
let exec = protection_supported(file.as_raw_handle(), PAGE_EXECUTE_READWRITE);
let mut access = FILE_MAP_COPY;
let protection = if exec {
access |= FILE_MAP_EXECUTE;
PAGE_EXECUTE_WRITECOPY
} else {
PAGE_WRITECOPY
};
let mut inner = MmapInner::new(file, protection, access, offset, len, true)?;
if exec {
inner.make_mut()?;
}
Ok(inner)
}
pub fn map_copy_read_only(
len: usize,
file: &File,
offset: u64,
_populate: bool,
) -> io::Result<MmapInner> {
let write = protection_supported(file.as_raw_handle(), PAGE_READWRITE);
let exec = protection_supported(file.as_raw_handle(), PAGE_EXECUTE_READ);
let mut access = FILE_MAP_COPY;
let protection = if exec {
access |= FILE_MAP_EXECUTE;
PAGE_EXECUTE_WRITECOPY
} else {
PAGE_WRITECOPY
};
let mut inner = MmapInner::new(file, protection, access, offset, len, true)?;
if write || exec {
inner.make_read_only()?;
}
Ok(inner)
}
pub fn map_anon(len: usize, _stack: bool) -> io::Result<MmapInner> {
unsafe {
// Create a mapping and view with maximum access permissions, then use `VirtualProtect`
// to set the actual `Protection`. This way, we can set more permissive protection later
// on.
// Also see https://msdn.microsoft.com/en-us/library/windows/desktop/aa366537.aspx
let handle = CreateFileMappingW(
INVALID_HANDLE_VALUE,
ptr::null_mut(),
PAGE_EXECUTE_READWRITE,
(len >> 16 >> 16) as DWORD,
(len & 0xffffffff) as DWORD,
ptr::null(),
);
if handle.is_null() {
return Err(io::Error::last_os_error());
}
let access = FILE_MAP_ALL_ACCESS | FILE_MAP_EXECUTE;
let ptr = MapViewOfFile(handle, access, 0, 0, len as SIZE_T);
CloseHandle(handle);
if ptr.is_null() {
return Err(io::Error::last_os_error());
}
let mut old = 0;
let result = VirtualProtect(ptr, len as SIZE_T, PAGE_READWRITE, &mut old);
if result != 0 {
Ok(MmapInner {
file: None,
ptr,
len: len as usize,
copy: false,
})
} else {
Err(io::Error::last_os_error())
}
}
}
pub fn flush(&self, offset: usize, len: usize) -> io::Result<()> {
self.flush_async(offset, len)?;
if let Some(ref file) = self.file {
file.sync_data()?;
}
Ok(())
}
pub fn flush_async(&self, offset: usize, len: usize) -> io::Result<()> {
let result = unsafe { FlushViewOfFile(self.ptr.add(offset), len as SIZE_T) };
if result != 0 {
Ok(())
} else {
Err(io::Error::last_os_error())
}
}
fn virtual_protect(&mut self, protect: DWORD) -> io::Result<()> {
unsafe {
let alignment = self.ptr as usize % allocation_granularity();
let ptr = self.ptr.offset(-(alignment as isize));
let aligned_len = self.len as SIZE_T + alignment as SIZE_T;
let mut old = 0;
let result = VirtualProtect(ptr, aligned_len, protect, &mut old);
if result != 0 {
Ok(())
} else {
Err(io::Error::last_os_error())
}
}
}
pub fn make_read_only(&mut self) -> io::Result<()> {
self.virtual_protect(PAGE_READONLY)
}
pub fn make_exec(&mut self) -> io::Result<()> {
if self.copy {
self.virtual_protect(PAGE_EXECUTE_WRITECOPY)
} else {
self.virtual_protect(PAGE_EXECUTE_READ)
}
}
pub fn make_mut(&mut self) -> io::Result<()> {
if self.copy {
self.virtual_protect(PAGE_WRITECOPY)
} else {
self.virtual_protect(PAGE_READWRITE)
}
}
#[inline]
pub fn ptr(&self) -> *const u8 {
self.ptr as *const u8
}
#[inline]
pub fn mut_ptr(&mut self) -> *mut u8 {
self.ptr as *mut u8
}
#[inline]
pub fn len(&self) -> usize {
self.len
}
}
impl Drop for MmapInner {
fn drop(&mut self) {
let alignment = self.ptr as usize % allocation_granularity();
unsafe {
let ptr = self.ptr.offset(-(alignment as isize));
assert!(
UnmapViewOfFile(ptr) != 0,
"unable to unmap mmap: {}",
io::Error::last_os_error()
);
}
}
}
unsafe impl Sync for MmapInner {}
unsafe impl Send for MmapInner {}
fn protection_supported(handle: RawHandle, protection: DWORD) -> bool {
unsafe {
let handle = CreateFileMappingW(handle, ptr::null_mut(), protection, 0, 0, ptr::null());
if handle.is_null() {
return false;
}
CloseHandle(handle);
true
}
}
fn allocation_granularity() -> usize {
unsafe {
let mut info = mem::zeroed();
GetSystemInfo(&mut info);
info.dwAllocationGranularity as usize
}
}