| //! Platform-dependent platform abstraction. |
| //! |
| //! The `std::sys` module is the abstracted interface through which |
| //! `std` talks to the underlying operating system. It has different |
| //! implementations for different operating system families, today |
| //! just Unix and Windows, and initial support for Redox. |
| //! |
| //! The centralization of platform-specific code in this module is |
| //! enforced by the "platform abstraction layer" tidy script in |
| //! `tools/tidy/src/pal.rs`. |
| //! |
| //! This module is closely related to the platform-independent system |
| //! integration code in `std::sys_common`. See that module's |
| //! documentation for details. |
| //! |
| //! In the future it would be desirable for the independent |
| //! implementations of this module to be extracted to their own crates |
| //! that `std` can link to, thus enabling their implementation |
| //! out-of-tree via crate replacement. Though due to the complex |
| //! inter-dependencies within `std` that will be a challenging goal to |
| //! achieve. |
| |
| #![allow(missing_debug_implementations)] |
| |
| pub mod common; |
| mod personality; |
| |
| cfg_if::cfg_if! { |
| if #[cfg(unix)] { |
| mod unix; |
| pub use self::unix::*; |
| } else if #[cfg(windows)] { |
| mod windows; |
| pub use self::windows::*; |
| } else if #[cfg(target_os = "solid_asp3")] { |
| mod solid; |
| pub use self::solid::*; |
| } else if #[cfg(target_os = "hermit")] { |
| mod hermit; |
| pub use self::hermit::*; |
| } else if #[cfg(target_os = "trusty")] { |
| mod trusty; |
| pub use self::trusty::*; |
| } else if #[cfg(target_os = "wasi")] { |
| mod wasi; |
| pub use self::wasi::*; |
| } else if #[cfg(target_family = "wasm")] { |
| mod wasm; |
| pub use self::wasm::*; |
| } else if #[cfg(target_os = "xous")] { |
| mod xous; |
| pub use self::xous::*; |
| } else if #[cfg(target_os = "uefi")] { |
| mod uefi; |
| pub use self::uefi::*; |
| } else if #[cfg(all(target_vendor = "fortanix", target_env = "sgx"))] { |
| mod sgx; |
| pub use self::sgx::*; |
| } else { |
| mod unsupported; |
| pub use self::unsupported::*; |
| } |
| } |
| |
| cfg_if::cfg_if! { |
| // Fuchsia components default to full backtrace. |
| if #[cfg(target_os = "fuchsia")] { |
| pub const FULL_BACKTRACE_DEFAULT: bool = true; |
| } else { |
| pub const FULL_BACKTRACE_DEFAULT: bool = false; |
| } |
| } |
| |
| #[cfg(not(test))] |
| cfg_if::cfg_if! { |
| if #[cfg(target_os = "android")] { |
| pub use self::android::log2f32; |
| pub use self::android::log2f64; |
| } else { |
| #[inline] |
| pub fn log2f32(n: f32) -> f32 { |
| unsafe { crate::intrinsics::log2f32(n) } |
| } |
| |
| #[inline] |
| pub fn log2f64(n: f64) -> f64 { |
| unsafe { crate::intrinsics::log2f64(n) } |
| } |
| } |
| } |
| |
| // Solaris/Illumos requires a wrapper around log, log2, and log10 functions |
| // because of their non-standard behavior (e.g., log(-n) returns -Inf instead |
| // of expected NaN). |
| #[cfg(not(test))] |
| #[cfg(any(target_os = "solaris", target_os = "illumos"))] |
| #[inline] |
| pub fn log_wrapper<F: Fn(f64) -> f64>(n: f64, log_fn: F) -> f64 { |
| if n.is_finite() { |
| if n > 0.0 { |
| log_fn(n) |
| } else if n == 0.0 { |
| f64::NEG_INFINITY // log(0) = -Inf |
| } else { |
| f64::NAN // log(-n) = NaN |
| } |
| } else if n.is_nan() { |
| n // log(NaN) = NaN |
| } else if n > 0.0 { |
| n // log(Inf) = Inf |
| } else { |
| f64::NAN // log(-Inf) = NaN |
| } |
| } |
| |
| #[cfg(not(test))] |
| #[cfg(not(any(target_os = "solaris", target_os = "illumos")))] |
| #[inline] |
| pub fn log_wrapper<F: Fn(f64) -> f64>(n: f64, log_fn: F) -> f64 { |
| log_fn(n) |
| } |
| |
| #[cfg(not(target_os = "uefi"))] |
| pub type RawOsError = i32; |
