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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6
compiler/rustc_codegen_llvm/src/back/write.rs
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@ -33,7 +33,7 @@ use rustc_session::config::{self, Lto, OutputType, Passes, SplitDwarfKind, Switc
use rustc_session::Session;
use rustc_span::symbol::sym;
use rustc_span::InnerSpan;
use rustc_target::spec::{CodeModel, RelocModel, SanitizerSet, SplitDebuginfo};
use rustc_target::spec::{CodeModel, RelocModel, SanitizerSet, SplitDebuginfo, TlsModel};
use crate::llvm::diagnostic::OptimizationDiagnosticKind;
use libc::{c_char, c_int, c_uint, c_void, size_t};
@ -223,7 +223,7 @@ pub fn target_machine_factory(
let path_mapping = sess.source_map().path_mapping().clone();
let force_emulated_tls = sess.target.force_emulated_tls;
let use_emulated_tls = matches!(sess.tls_model(), TlsModel::Emulated);
// copy the exe path, followed by path all into one buffer
// null terminating them so we can use them as null terminated strings
@ -297,7 +297,7 @@ pub fn target_machine_factory(
&split_dwarf_file,
&output_obj_file,
&debuginfo_compression,
force_emulated_tls,
use_emulated_tls,
&args_cstr_buff,
)
})