Auto merge of rust-lang#117285 - joboet:move_platforms_to_pal, r=ChrisDenton

Move platform modules into `sys::pal`

This is the initial step of rust-lang#117276. `sys` just re-exports everything from the current `sys` for now, I'll move the implementations for the individual features one-by-one after this PR merges.

Author: bors

.reuse/dep5

@@ -51,7 +51,7 @@ Copyright: 2019 The Crossbeam Project Developers
            The Rust Project Developers (see https://thanks.rust-lang.org)
 License: MIT OR Apache-2.0
 
-Files: library/std/src/sys/unix/locks/fuchsia_mutex.rs
+Files: library/std/src/sys/pal/unix/locks/fuchsia_mutex.rs
 Copyright: 2016 The Fuchsia Authors
            The Rust Project Developers (see https://thanks.rust-lang.org)
 License: BSD-2-Clause AND (MIT OR Apache-2.0)

compiler/rustc_session/src/config/sigpipe.rs

@@ -1,7 +1,7 @@
-//! NOTE: Keep these constants in sync with `library/std/src/sys/unix/mod.rs`!
+//! NOTE: Keep these constants in sync with `library/std/src/sys/pal/unix/mod.rs`!
 
 /// The default value if `#[unix_sigpipe]` is not specified. This resolves
-/// to `SIG_IGN` in `library/std/src/sys/unix/mod.rs`.
+/// to `SIG_IGN` in `library/std/src/sys/pal/unix/mod.rs`.
 ///
 /// Note that `SIG_IGN` has been the Rust default since 2014. See
 /// <https://github.com/rust-lang/rust/issues/62569>.

compiler/rustc_target/src/spec/base/illumos.rs

@@ -39,7 +39,7 @@ pub fn opts() -> TargetOptions {
         // While we support ELF TLS, rust requires a way to register
         // cleanup handlers (in C, this would be something along the lines of:
         // void register_callback(void (*fn)(void *), void *arg);
-        // (see src/libstd/sys/unix/fast_thread_local.rs) that is currently
+        // (see src/libstd/sys/pal/unix/fast_thread_local.rs) that is currently
         // missing in illumos. For now at least, we must fallback to using
         // pthread_{get,set}specific.
         //has_thread_local: true,

library/std/src/sys/mod.rs

@@ -1,124 +1,8 @@
-//! 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 = "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 if #[cfg(target_os = "teeos")] {
-        mod teeos;
-        pub use self::teeos::*;
-    } 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;
+/// The PAL (platform abstraction layer) contains platform-specific abstractions
+/// for implementing the features in the other submodules, e.g. UNIX file
+/// descriptors.
+mod pal;
+
+// FIXME(117276): remove this, move feature implementations into individual
+//                submodules.
+pub use pal::*;