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Use #[inline] on Windows for thread local access

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This commit is contained in:
John Kåre Alsaker 2023-02-15 16:50:28 +01:00
parent 0d89c6a2d4
commit 3019a341f3
2 changed files with 4 additions and 48 deletions
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26
library/std/src/sys/common/thread_local/fast_local.rs
View File

@ -10,7 +10,7 @@
macro_rules! __thread_local_inner {
// used to generate the `LocalKey` value for const-initialized thread locals
(@key $t:ty, const $init:expr) => {{
#[cfg_attr(not(windows), inline)] // see comments below
#[cfg_attr(not(bootstrap), inline)]
#[deny(unsafe_op_in_unsafe_fn)]
unsafe fn __getit(
_init: $crate::option::Option<&mut $crate::option::Option<$t>>,
@ -77,29 +77,7 @@ macro_rules! __thread_local_inner {
#[inline]
fn __init() -> $t { $init }
// When reading this function you might ask "why is this inlined
// everywhere other than Windows?", and that's a very reasonable
// question to ask. The short story is that it segfaults rustc if
// this function is inlined. The longer story is that Windows looks
// to not support `extern` references to thread locals across DLL
// boundaries. This appears to at least not be supported in the ABI
// that LLVM implements.
//
// Because of this we never inline on Windows, but we do inline on
// other platforms (where external references to thread locals
// across DLLs are supported). A better fix for this would be to
// inline this function on Windows, but only for "statically linked"
// components. For example if two separately compiled rlibs end up
// getting linked into a DLL then it's fine to inline this function
// across that boundary. It's only not fine to inline this function
// across a DLL boundary. Unfortunately rustc doesn't currently
// have this sort of logic available in an attribute, and it's not
// clear that rustc is even equipped to answer this (it's more of a
// Cargo question kinda). This means that, unfortunately, Windows
// gets the pessimistic path for now where it's never inlined.
//
// The issue of "should enable on Windows sometimes" is #84933
#[cfg_attr(not(windows), inline)]
#[cfg_attr(not(bootstrap), inline)]
unsafe fn __getit(
init: $crate::option::Option<&mut $crate::option::Option<$t>>,
) -> $crate::option::Option<&'static $t> {

26
library/std/src/sys/common/thread_local/os_local.rs
View File

@ -10,7 +10,7 @@
macro_rules! __thread_local_inner {
// used to generate the `LocalKey` value for const-initialized thread locals
(@key $t:ty, const $init:expr) => {{
#[cfg_attr(not(windows), inline)] // see comments below
#[cfg_attr(not(bootstrap), inline)]
#[deny(unsafe_op_in_unsafe_fn)]
unsafe fn __getit(
_init: $crate::option::Option<&mut $crate::option::Option<$t>>,
@ -49,29 +49,7 @@ macro_rules! __thread_local_inner {
#[inline]
fn __init() -> $t { $init }
// When reading this function you might ask "why is this inlined
// everywhere other than Windows?", and that's a very reasonable
// question to ask. The short story is that it segfaults rustc if
// this function is inlined. The longer story is that Windows looks
// to not support `extern` references to thread locals across DLL
// boundaries. This appears to at least not be supported in the ABI
// that LLVM implements.
//
// Because of this we never inline on Windows, but we do inline on
// other platforms (where external references to thread locals
// across DLLs are supported). A better fix for this would be to
// inline this function on Windows, but only for "statically linked"
// components. For example if two separately compiled rlibs end up
// getting linked into a DLL then it's fine to inline this function
// across that boundary. It's only not fine to inline this function
// across a DLL boundary. Unfortunately rustc doesn't currently
// have this sort of logic available in an attribute, and it's not
// clear that rustc is even equipped to answer this (it's more of a
// Cargo question kinda). This means that, unfortunately, Windows
// gets the pessimistic path for now where it's never inlined.
//
// The issue of "should enable on Windows sometimes" is #84933
#[cfg_attr(not(windows), inline)]
#[cfg_attr(not(bootstrap), inline)]
unsafe fn __getit(
init: $crate::option::Option<&mut $crate::option::Option<$t>>,
) -> $crate::option::Option<&'static $t> {