diff options
Diffstat (limited to 'third_party/rust/safemem')
| -rw-r--r-- | third_party/rust/safemem/.cargo-checksum.json | 1 | ||||
| -rw-r--r-- | third_party/rust/safemem/Cargo.toml | 28 | ||||
| -rw-r--r-- | third_party/rust/safemem/LICENSE-APACHE | 201 | ||||
| -rw-r--r-- | third_party/rust/safemem/LICENSE-MIT | 25 | ||||
| -rw-r--r-- | third_party/rust/safemem/README.md | 27 | ||||
| -rw-r--r-- | third_party/rust/safemem/run_miri.sh | 11 | ||||
| -rw-r--r-- | third_party/rust/safemem/src/lib.rs | 143 |
7 files changed, 436 insertions, 0 deletions
diff --git a/third_party/rust/safemem/.cargo-checksum.json b/third_party/rust/safemem/.cargo-checksum.json new file mode 100644 index 0000000000..11e964e5c2 --- /dev/null +++ b/third_party/rust/safemem/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"Cargo.toml":"1a812b03bbe60da68e444ffc2b54b1c8696d3d9694a08784b80d6f3911762534","LICENSE-APACHE":"7cfd738c53d61c79f07e348f622bf7707c9084237054d37fbe07788a75f5881c","LICENSE-MIT":"64e1c5f067ee2d8c0ee8abd751e57275d4e97e4f7c05699bc23f5005a9c53043","README.md":"fcdfcdc818bac5fbccc5dfc25f8e2916226916c9f3bbd37b6646013bb34c5145","run_miri.sh":"3e9f2a577a268a97b93680a9ec3c218fc231c8fed3e155925c6d58ca89435d63","src/lib.rs":"cec30b7c5f141f490f30b5d08b4925904af47f518b049d69c2f8c48199d24a27"},"package":"ef703b7cb59335eae2eb93ceb664c0eb7ea6bf567079d843e09420219668e072"}
\ No newline at end of file diff --git a/third_party/rust/safemem/Cargo.toml b/third_party/rust/safemem/Cargo.toml new file mode 100644 index 0000000000..bfdc63f289 --- /dev/null +++ b/third_party/rust/safemem/Cargo.toml @@ -0,0 +1,28 @@ +# 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] +name = "safemem" +version = "0.3.3" +authors = ["Austin Bonander <austin.bonander@gmail.com>"] +description = "Safe wrappers for memory-accessing functions, like `std::ptr::copy()`." +documentation = "https://docs.rs/safemem" +keywords = ["memset", "memmove", "copy"] +categories = ["no-std"] +license = "MIT/Apache-2.0" +repository = "https://github.com/abonander/safemem" + +[dependencies] + +[features] +default = ["std"] +std = [] diff --git a/third_party/rust/safemem/LICENSE-APACHE b/third_party/rust/safemem/LICENSE-APACHE new file mode 100644 index 0000000000..f47c941141 --- /dev/null +++ b/third_party/rust/safemem/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License
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diff --git a/third_party/rust/safemem/README.md b/third_party/rust/safemem/README.md new file mode 100644 index 0000000000..1ded7a626c --- /dev/null +++ b/third_party/rust/safemem/README.md @@ -0,0 +1,27 @@ +# safemem 
+Safe wrappers for `memmove`, `memset`, etc. in Rust
+
+##### Minimum Supported Rust Version: 1.19.0
+
+`no_std` Support
+----------------
+
+This crate has support for `no_std` which is controlled via default feature `std`. To use the crate
+in a `no_std` environment simply turn off default features.
+
+
+License
+-------
+
+Licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any
+additional terms or conditions.
diff --git a/third_party/rust/safemem/run_miri.sh b/third_party/rust/safemem/run_miri.sh new file mode 100644 index 0000000000..20b96c37fb --- /dev/null +++ b/third_party/rust/safemem/run_miri.sh @@ -0,0 +1,11 @@ +#!/bin/sh
+
+MIRI_NIGHTLY=nightly-$(curl -s https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/miri)
+echo "Installing latest nightly with Miri: $MIRI_NIGHTLY"
+rustup set profile minimal
+rustup default "$MIRI_NIGHTLY"
+
+rustup component add miri
+cargo miri setup
+
+cargo miri test -- -- -Zunstable-options --exclude-should-panic
diff --git a/third_party/rust/safemem/src/lib.rs b/third_party/rust/safemem/src/lib.rs new file mode 100644 index 0000000000..a30c933906 --- /dev/null +++ b/third_party/rust/safemem/src/lib.rs @@ -0,0 +1,143 @@ +//! Safe wrappers for memory-accessing functions like `std::ptr::copy()`.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg(not(feature = "std"))]
+extern crate core as std;
+use std::ptr;
+
+macro_rules! idx_check (
+ ($slice:expr, $idx:expr) => {
+ assert!($idx < $slice.len(),
+ concat!("`", stringify!($idx), "` ({}) out of bounds. Length: {}"),
+ $idx, $slice.len());
+ }
+);
+
+macro_rules! len_check (
+ ($slice:expr, $start:ident, $len:ident) => {
+ assert!(
+ $start.checked_add($len)
+ .expect(concat!("Overflow evaluating ", stringify!($start + $len)))
+ <= $slice.len(),
+ "Length {} starting at {} is out of bounds (slice len {}).", $len, $start, $slice.len()
+ )
+ }
+);
+
+/// Copy `len` elements from `src_idx` to `dest_idx`. Ranges may overlap.
+///
+/// Safe wrapper for `memmove()`/`std::ptr::copy()`.
+///
+/// ###Panics
+/// * If either `src_idx` or `dest_idx` are out of bounds, or if either of these plus `len` is out of
+/// bounds.
+/// * If `src_idx + len` or `dest_idx + len` overflows.
+pub fn copy_over<T: Copy>(slice: &mut [T], src_idx: usize, dest_idx: usize, len: usize) {
+ if slice.len() == 0 { return; }
+
+ idx_check!(slice, src_idx);
+ idx_check!(slice, dest_idx);
+ len_check!(slice, src_idx, len);
+ len_check!(slice, dest_idx, len);
+
+ // At any point a Rust reference exists, the compiler is free to do this.
+ // So we explicitely add it to be caught by miri.
+ #[cfg(miri)]
+ slice.iter().copied().for_each(drop);
+
+ let ptr = slice.as_mut_ptr();
+
+ unsafe {
+ ptr::copy(ptr.offset(src_idx as isize), ptr.offset(dest_idx as isize), len);
+ }
+}
+
+/// Safe wrapper for `std::ptr::write_bytes()`/`memset()`.
+pub fn write_bytes(slice: &mut [u8], byte: u8) {
+ unsafe {
+ ptr::write_bytes(slice.as_mut_ptr(), byte, slice.len());
+ }
+}
+
+/// Prepend `elems` to `vec`, resizing if necessary.
+///
+/// ### Panics
+///
+/// If `vec.len() + elems.len()` overflows.
+#[cfg(feature = "std")]
+pub fn prepend<T: Copy>(elems: &[T], vec: &mut Vec<T>) {
+ let elems_len = elems.len(); // `<= isize::MAX as usize`
+ if elems_len == 0 { return; }
+
+ let old_len = vec.len(); // `<= isize::MAX as usize`
+ if old_len == 0 {
+ // Prepend = append: delegate to Rust's stdlib implementation.
+ vec.extend_from_slice(elems);
+ } else {
+ // Our overflow check occurs here, no need to do it ourselves.
+ vec.reserve(elems_len);
+ let ptr = vec.as_mut_ptr();
+ unsafe {
+ // Move the old elements down to the end.
+ ptr::copy(
+ ptr,
+ ptr.offset(elems_len as isize),
+ old_len,
+ );
+ // Copy the input elements to the start
+ ptr::copy_nonoverlapping(
+ elems.as_ptr(),
+ ptr,
+ elems_len,
+ );
+ // Set the len *after* having initialized the elements.
+ vec.set_len(old_len + elems_len);
+ }
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ #[should_panic]
+ fn bounds_check() {
+ let mut arr = [0i32, 1, 2, 3, 4, 5];
+
+ copy_over(&mut arr, 2, 1, 7);
+ }
+
+ #[test]
+ fn copy_empty() {
+ let mut arr: [i32; 0] = [];
+
+ copy_over(&mut arr, 0, 0, 0);
+ }
+
+ #[test]
+ #[cfg(feature = "std")]
+ fn prepend_empty() {
+ let mut vec: Vec<i32> = vec![];
+ prepend(&[1, 2, 3], &mut vec);
+ }
+
+ #[test]
+ #[cfg(feature = "std")]
+ fn prepend_i32() {
+ let mut vec = vec![3, 4, 5];
+ prepend(&[1, 2], &mut vec);
+ assert_eq!(vec, &[1, 2, 3, 4, 5]);
+ }
+
+ /// Detect potential uninit values when running miri
+ #[test]
+ #[cfg(all(
+ feature = "std",
+ miri,
+ ))]
+ fn prepend_bool() {
+ prepend(&[true], &mut vec![false]);
+ }
+}
|