commit 1faf15fc64b19a96fe4fb65a480f587d8af01f5c Author: Jorge Aparicio Date: Sun Aug 7 15:58:05 2016 -0500 initial commit diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..b203ea6 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +*.rs.bk +Cargo.lock +target diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..663d9b1 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,4 @@ +[package] +authors = ["Jorge Aparicio "] +name = "rustc_builtins" +version = "0.1.0" diff --git a/LICENSE-APACHE b/LICENSE-APACHE new file mode 100644 index 0000000..16fe87b --- /dev/null +++ b/LICENSE-APACHE @@ -0,0 +1,201 @@ + 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/README.md b/README.md new file mode 100644 index 0000000..f54664f --- /dev/null +++ b/README.md @@ -0,0 +1,23 @@ +[![Build Status][status]](https://travis-ci.org/japaric/rustc-builtins) + +[status]: https://travis-ci.org/japaric/rustc-builtins.svg?branch=master + +# `rustc-builtins` + +> [WIP] Porting `compiler-rt` intrinsics to Rust + +## 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/src/arm.rs b/src/arm.rs new file mode 100644 index 0000000..0be06a4 --- /dev/null +++ b/src/arm.rs @@ -0,0 +1,67 @@ +use core::intrinsics; + +macro_rules! defer { + ($($symbol:ident),+ -> $routine:ident) => { + $( + #[naked] + #[no_mangle] + pub extern "C" fn $symbol() { + unsafe { + asm!(concat!("b ", stringify!($routine))); + intrinsics::unreachable(); + } + } + )+ + } +} + +// FIXME only `__aeabi_memcmp` should be defined like this. The `*4` and `*8` variants should be +// defined as aliases of `__aeabi_memcmp` +defer!(__aeabi_memcmp, __aeabi_memcmp4, __aeabi_memcmp8 -> memcmp); + +// FIXME same issue as `__aeabi_memcmp*` +defer!(__aeabi_memcpy, __aeabi_memcpy4, __aeabi_memcpy8 -> memcpy); + +// FIXME same issue as `__aeabi_memcmp*` +defer!(__aeabi_memmove, __aeabi_memmove4, __aeabi_memmove8 -> memmove); + +macro_rules! memset { + ($($symbol:ident),+) => { + $( + #[naked] + #[no_mangle] + pub extern "C" fn $symbol() { + unsafe { + asm!("mov r3, r1 + mov r1, r2 + mov r2, r3 + b memset"); + intrinsics::unreachable(); + } + } + )+ + } +} + +// FIXME same issue as `__aeabi_memcmp*` +memset!(__aeabi_memset, __aeabi_memset4, __aeabi_memset8); + +macro_rules! memclr { + ($($symbol:ident),+) => { + $( + #[naked] + #[no_mangle] + pub extern "C" fn $symbol() { + unsafe { + asm!("mov r2, r1 + mov r1, #0 + b memset"); + intrinsics::unreachable(); + } + } + )+ + } +} + +// FIXME same issue as `__aeabi_memcmp*` +memclr!(__aeabi_memclr, __aeabi_memclr4, __aeabi_memclr8); diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..838e62a --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,43 @@ +#![allow(unused_features)] +#![cfg_attr(not(test), no_std)] +#![feature(asm)] +#![feature(core_intrinsics)] +#![feature(naked_functions)] +// TODO(rust-lang/rust#35021) uncomment when that PR lands +// #![feature(rustc_builtins)] + +#[cfg(test)] +extern crate core; + +use core::mem; + +#[cfg(target_arch = "arm")] +pub mod arm; + +#[cfg(target_arch = "x86_64")] +pub mod x86_64; + +#[cfg(test)] +mod test; + +const CHAR_BITS: usize = 8; + +macro_rules! absv_i2 { + ($intrinsic:ident : $ty:ty) => { + #[no_mangle] + pub extern "C" fn $intrinsic(x: $ty) -> $ty { + let n = mem::size_of::<$ty>() * CHAR_BITS; + if x == 1 << (n - 1) { + panic!(); + } + let y = x >> (n - 1); + (x ^ y) - y + } + + } +} + +absv_i2!(__absvsi2: i32); +absv_i2!(__absvdi2: i64); +// TODO(rust-lang/35118)? +// absv_i2!(__absvti2, i128); diff --git a/src/test.rs b/src/test.rs new file mode 100644 index 0000000..9abfec7 --- /dev/null +++ b/src/test.rs @@ -0,0 +1,25 @@ +use std::panic; + +macro_rules! absv_i2 { + ($intrinsic:ident: $ty:ident) => { + #[test] + fn $intrinsic() { + assert!(panic::catch_unwind(|| ::$intrinsic(::std::$ty::MIN)).is_err()); + assert_eq!(::$intrinsic(::std::$ty::MIN + 1), ::std::$ty::MAX); + assert_eq!(::$intrinsic(::std::$ty::MIN + 2), ::std::$ty::MAX - 1); + assert_eq!(::$intrinsic(-1), 1); + assert_eq!(::$intrinsic(-2), 2); + assert_eq!(::$intrinsic(0), 0); + assert_eq!(::$intrinsic(1), 1); + assert_eq!(::$intrinsic(2), 2); + assert_eq!(::$intrinsic(2), 2); + assert_eq!(::$intrinsic(::std::$ty::MAX - 1), ::std::$ty::MAX - 1); + assert_eq!(::$intrinsic(::std::$ty::MAX), ::std::$ty::MAX); + } + } +} + +absv_i2!(__absvsi2: i32); +absv_i2!(__absvdi2: i64); +// TODO(rust-lang/35118)? +// absv_i2!(__absvti2: i128); diff --git a/src/x86_64.rs b/src/x86_64.rs new file mode 100644 index 0000000..d4ea0f7 --- /dev/null +++ b/src/x86_64.rs @@ -0,0 +1,9 @@ +#[no_mangle] +pub extern "C" fn __floatdisf(x: i64) -> f32 { + x as f32 +} + +#[no_mangle] +pub extern "C" fn __floatdidf(x: i64) -> f64 { + x as f64 +}