bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Add emulated TLS support

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

4
compiler/rustc_codegen_llvm/src/lib.rs
View file

@ -306,7 +306,9 @@ impl CodegenBackend for LlvmCodegenBackend {
}
PrintKind::TlsModels => {
writeln!(out, "Available TLS models:");
for name in &["global-dynamic", "local-dynamic", "initial-exec", "local-exec"] {
for name in
&["global-dynamic", "local-dynamic", "initial-exec", "local-exec", "emulated"]
{
writeln!(out, " {name}");
}
writeln!(out);