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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
commit | 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch) | |
tree | a31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /third_party/rust/foreign-types | |
parent | Initial commit. (diff) | |
download | firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip |
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/foreign-types')
-rw-r--r-- | third_party/rust/foreign-types/.cargo-checksum.json | 1 | ||||
-rw-r--r-- | third_party/rust/foreign-types/Cargo.toml | 22 | ||||
-rw-r--r-- | third_party/rust/foreign-types/LICENSE-APACHE | 202 | ||||
-rw-r--r-- | third_party/rust/foreign-types/LICENSE-MIT | 19 | ||||
-rw-r--r-- | third_party/rust/foreign-types/README.md | 23 | ||||
-rw-r--r-- | third_party/rust/foreign-types/src/lib.rs | 306 |
6 files changed, 573 insertions, 0 deletions
diff --git a/third_party/rust/foreign-types/.cargo-checksum.json b/third_party/rust/foreign-types/.cargo-checksum.json new file mode 100644 index 0000000000..7e74bd59b4 --- /dev/null +++ b/third_party/rust/foreign-types/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"Cargo.toml":"1a667c28f60115423b68fea369255c2dcb129b8dce10f30e0e1da73d05f9adab","LICENSE-APACHE":"c6596eb7be8581c18be736c846fb9173b69eccf6ef94c5135893ec56bd92ba08","LICENSE-MIT":"333ea3aaa3cadb819f4acd9f9153f9feee060a995ca8710f32bc5bd9a4b91734","README.md":"6f3f1429f2724a481df811842f318d0d3b83160ada953fd869d4b685f7fd72e4","src/lib.rs":"4f0a33bf8ec94a57d1b71e50f1af8ca410985e447f69fdc9c680545b03ea4566"},"package":"f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"}
\ No newline at end of file diff --git a/third_party/rust/foreign-types/Cargo.toml b/third_party/rust/foreign-types/Cargo.toml new file mode 100644 index 0000000000..6ff5567de3 --- /dev/null +++ b/third_party/rust/foreign-types/Cargo.toml @@ -0,0 +1,22 @@ +# 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 = "foreign-types" +version = "0.3.2" +authors = ["Steven Fackler <sfackler@gmail.com>"] +description = "A framework for Rust wrappers over C APIs" +readme = "README.md" +license = "MIT/Apache-2.0" +repository = "https://github.com/sfackler/foreign-types" +[dependencies.foreign-types-shared] +version = "0.1" diff --git a/third_party/rust/foreign-types/LICENSE-APACHE b/third_party/rust/foreign-types/LICENSE-APACHE new file mode 100644 index 0000000000..8f71f43fee --- /dev/null +++ b/third_party/rust/foreign-types/LICENSE-APACHE @@ -0,0 +1,202 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/third_party/rust/foreign-types/README.md b/third_party/rust/foreign-types/README.md new file mode 100644 index 0000000000..cd15965fad --- /dev/null +++ b/third_party/rust/foreign-types/README.md @@ -0,0 +1,23 @@ +# foreign-types + +[![CircleCI](https://circleci.com/gh/sfackler/foreign-types.svg?style=shield)](https://circleci.com/gh/sfackler/foreign-types) + +[Documentation](https://docs.rs/foreign-types) + +A framework for Rust wrappers over C APIs. + +## 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/foreign-types/src/lib.rs b/third_party/rust/foreign-types/src/lib.rs new file mode 100644 index 0000000000..6ce959207f --- /dev/null +++ b/third_party/rust/foreign-types/src/lib.rs @@ -0,0 +1,306 @@ +//! A framework for Rust wrappers over C APIs. +//! +//! Ownership is as important in C as it is in Rust, but the semantics are often implicit. In +//! particular, pointer-to-value is commonly used to pass C values both when transferring ownership +//! or a borrow. +//! +//! This crate provides a framework to define a Rust wrapper over these kinds of raw C APIs in a way +//! that allows ownership semantics to be expressed in an ergonomic manner. The framework takes a +//! dual-type approach similar to APIs in the standard library such as `PathBuf`/`Path` or `String`/ +//! `str`. One type represents an owned value and references to the other represent borrowed +//! values. +//! +//! # Examples +//! +//! ``` +//! use foreign_types::{ForeignType, ForeignTypeRef, Opaque}; +//! use std::ops::{Deref, DerefMut}; +//! +//! mod foo_sys { +//! pub enum FOO {} +//! +//! extern { +//! pub fn FOO_free(foo: *mut FOO); +//! } +//! } +//! +//! // The borrowed type is a newtype wrapper around an `Opaque` value. +//! // +//! // `FooRef` values never exist; we instead create references to `FooRef`s +//! // from raw C pointers. +//! pub struct FooRef(Opaque); +//! +//! impl ForeignTypeRef for FooRef { +//! type CType = foo_sys::FOO; +//! } +//! +//! // The owned type is simply a newtype wrapper around the raw C type. +//! // +//! // It dereferences to `FooRef`, so methods that do not require ownership +//! // should be defined there. +//! pub struct Foo(*mut foo_sys::FOO); +//! +//! impl Drop for Foo { +//! fn drop(&mut self) { +//! unsafe { foo_sys::FOO_free(self.0) } +//! } +//! } +//! +//! impl ForeignType for Foo { +//! type CType = foo_sys::FOO; +//! type Ref = FooRef; +//! +//! unsafe fn from_ptr(ptr: *mut foo_sys::FOO) -> Foo { +//! Foo(ptr) +//! } +//! +//! fn as_ptr(&self) -> *mut foo_sys::FOO { +//! self.0 +//! } +//! } +//! +//! impl Deref for Foo { +//! type Target = FooRef; +//! +//! fn deref(&self) -> &FooRef { +//! unsafe { FooRef::from_ptr(self.0) } +//! } +//! } +//! +//! impl DerefMut for Foo { +//! fn deref_mut(&mut self) -> &mut FooRef { +//! unsafe { FooRef::from_ptr_mut(self.0) } +//! } +//! } +//! ``` +//! +//! The `foreign_type!` macro can generate this boilerplate for you: +//! +//! ``` +//! #[macro_use] +//! extern crate foreign_types; +//! +//! mod foo_sys { +//! pub enum FOO {} +//! +//! extern { +//! pub fn FOO_free(foo: *mut FOO); +//! pub fn FOO_duplicate(foo: *mut FOO) -> *mut FOO; // Optional +//! } +//! } +//! +//! foreign_type! { +//! type CType = foo_sys::FOO; +//! fn drop = foo_sys::FOO_free; +//! fn clone = foo_sys::FOO_duplicate; // Optional +//! /// A Foo. +//! pub struct Foo; +//! /// A borrowed Foo. +//! pub struct FooRef; +//! } +//! +//! # fn main() {} +//! ``` +//! +//! If `fn clone` is specified, then it must take `CType` as an argument and return a copy of it as `CType`. +//! It will be used to implement `ToOwned` and `Clone`. +//! +//! `#[derive(…)] is permitted before the lines with `pub struct`. +//! `#[doc(hidden)]` before the `type CType` line will hide the `foreign_type!` implementations from documentation. +//! +//! Say we then have a separate type in our C API that contains a `FOO`: +//! +//! ``` +//! mod foo_sys { +//! pub enum FOO {} +//! pub enum BAR {} +//! +//! extern { +//! pub fn FOO_free(foo: *mut FOO); +//! pub fn BAR_free(bar: *mut BAR); +//! pub fn BAR_get_foo(bar: *mut BAR) -> *mut FOO; +//! } +//! } +//! ``` +//! +//! The documentation for the C library states that `BAR_get_foo` returns a reference into the `BAR` +//! passed to it, which translates into a reference in Rust. It also says that we're allowed to +//! modify the `FOO`, so we'll define a pair of accessor methods, one immutable and one mutable: +//! +//! ``` +//! #[macro_use] +//! extern crate foreign_types; +//! +//! use foreign_types::ForeignTypeRef; +//! +//! mod foo_sys { +//! pub enum FOO {} +//! pub enum BAR {} +//! +//! extern { +//! pub fn FOO_free(foo: *mut FOO); +//! pub fn BAR_free(bar: *mut BAR); +//! pub fn BAR_get_foo(bar: *mut BAR) -> *mut FOO; +//! } +//! } +//! +//! foreign_type! { +//! #[doc(hidden)] +//! type CType = foo_sys::FOO; +//! fn drop = foo_sys::FOO_free; +//! /// A Foo. +//! pub struct Foo; +//! /// A borrowed Foo. +//! pub struct FooRef; +//! } +//! +//! foreign_type! { +//! type CType = foo_sys::BAR; +//! fn drop = foo_sys::BAR_free; +//! /// A Foo. +//! pub struct Bar; +//! /// A borrowed Bar. +//! pub struct BarRef; +//! } +//! +//! impl BarRef { +//! fn foo(&self) -> &FooRef { +//! unsafe { FooRef::from_ptr(foo_sys::BAR_get_foo(self.as_ptr())) } +//! } +//! +//! fn foo_mut(&mut self) -> &mut FooRef { +//! unsafe { FooRef::from_ptr_mut(foo_sys::BAR_get_foo(self.as_ptr())) } +//! } +//! } +//! +//! # fn main() {} +//! ``` +#![no_std] +#![warn(missing_docs)] +#![doc(html_root_url="https://docs.rs/foreign-types/0.3")] +extern crate foreign_types_shared; + +#[doc(inline)] +pub use foreign_types_shared::*; + +/// A macro to easily define wrappers for foreign types. +/// +/// # Examples +/// +/// ``` +/// #[macro_use] +/// extern crate foreign_types; +/// +/// # mod openssl_sys { pub type SSL = (); pub unsafe fn SSL_free(_: *mut SSL) {} pub unsafe fn SSL_dup(x: *mut SSL) -> *mut SSL {x} } +/// foreign_type! { +/// type CType = openssl_sys::SSL; +/// fn drop = openssl_sys::SSL_free; +/// fn clone = openssl_sys::SSL_dup; +/// /// Documentation for the owned type. +/// pub struct Ssl; +/// /// Documentation for the borrowed type. +/// pub struct SslRef; +/// } +/// +/// # fn main() {} +/// ``` +#[macro_export] +macro_rules! foreign_type { + ( + $(#[$impl_attr:meta])* + type CType = $ctype:ty; + fn drop = $drop:expr; + $(fn clone = $clone:expr;)* + $(#[$owned_attr:meta])* + pub struct $owned:ident; + $(#[$borrowed_attr:meta])* + pub struct $borrowed:ident; + ) => { + $(#[$owned_attr])* + pub struct $owned(*mut $ctype); + + $(#[$impl_attr])* + impl $crate::ForeignType for $owned { + type CType = $ctype; + type Ref = $borrowed; + + #[inline] + unsafe fn from_ptr(ptr: *mut $ctype) -> $owned { + $owned(ptr) + } + + #[inline] + fn as_ptr(&self) -> *mut $ctype { + self.0 + } + } + + impl Drop for $owned { + #[inline] + fn drop(&mut self) { + unsafe { $drop(self.0) } + } + } + + $( + impl Clone for $owned { + #[inline] + fn clone(&self) -> $owned { + unsafe { + let handle: *mut $ctype = $clone(self.0); + $crate::ForeignType::from_ptr(handle) + } + } + } + + impl ::std::borrow::ToOwned for $borrowed { + type Owned = $owned; + #[inline] + fn to_owned(&self) -> $owned { + unsafe { + let handle: *mut $ctype = $clone($crate::ForeignTypeRef::as_ptr(self)); + $crate::ForeignType::from_ptr(handle) + } + } + } + )* + + impl ::std::ops::Deref for $owned { + type Target = $borrowed; + + #[inline] + fn deref(&self) -> &$borrowed { + unsafe { $crate::ForeignTypeRef::from_ptr(self.0) } + } + } + + impl ::std::ops::DerefMut for $owned { + #[inline] + fn deref_mut(&mut self) -> &mut $borrowed { + unsafe { $crate::ForeignTypeRef::from_ptr_mut(self.0) } + } + } + + impl ::std::borrow::Borrow<$borrowed> for $owned { + #[inline] + fn borrow(&self) -> &$borrowed { + &**self + } + } + + impl ::std::convert::AsRef<$borrowed> for $owned { + #[inline] + fn as_ref(&self) -> &$borrowed { + &**self + } + } + + $(#[$borrowed_attr])* + pub struct $borrowed($crate::Opaque); + + $(#[$impl_attr])* + impl $crate::ForeignTypeRef for $borrowed { + type CType = $ctype; + } + } +} |