bjoernager/rust
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Add emulated TLS support

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Currently LLVM uses emutls by default
for some targets (such as android, openbsd),
but rust does not use it, because `has_thread_local` is false.

This commit has some changes to allow users to enable emutls:

1. add `-Zhas-thread-local` flag to specify
    that std uses `#[thread_local]` instead of pthread key.
2. when using emutls, decorate symbol names
    to find thread local symbol correctly.
3. change `-Zforce-emulated-tls` to `-Ztls-model=emulated`
    to explicitly specify whether to generate emutls.
This commit is contained in:
quininer 2023-11-13 20:48:23 +08:00
parent 8a7b2035f8
commit e5b76892cc
17 changed files with 71 additions and 28 deletions
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2
compiler/rustc_session/src/config.rs
View file

@ -1283,7 +1283,7 @@ fn default_configuration(sess: &Session) -> Cfg {
ret.insert((sym::relocation_model, Some(relocation_model)));
}
ret.insert((sym::target_vendor, Some(Symbol::intern(vendor))));
if sess.target.has_thread_local {
if sess.opts.unstable_opts.has_thread_local.unwrap_or(sess.target.has_thread_local) {
ret.insert((sym::target_thread_local, None));
}
let mut has_atomic = false;

2
compiler/rustc_session/src/options.rs
View file

@ -1624,6 +1624,8 @@ options! {
graphviz_font: String = ("Courier, monospace".to_string(), parse_string, [UNTRACKED],
"use the given `fontname` in graphviz output; can be overridden by setting \
environment variable `RUSTC_GRAPHVIZ_FONT` (default: `Courier, monospace`)"),
has_thread_local: Option<bool> = (None, parse_opt_bool, [TRACKED],
"explicitly enable the `cfg(target_thread_local)` directive"),
hir_stats: bool = (false, parse_bool, [UNTRACKED],
"print some statistics about AST and HIR (default: no)"),
human_readable_cgu_names: bool = (false, parse_bool, [TRACKED],