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Auto merge of #108089 - Zoxc:windows-tls, r=bjorn3

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Support TLS access into dylibs on Windows

This allows access to `#[thread_local]`  in upstream dylibs on Windows by introducing a MIR shim to return the address of the thread local. Accesses that go into an upstream dylib will call the MIR shim to get the address of it.

`convert_tls_rvalues` is introduced in `rustc_codegen_ssa` which rewrites MIR TLS accesses to dummy calls which are replaced with calls to the MIR shims when the dummy calls are lowered to backend calls.

A new `dll_tls_export` target option enables this behavior with a `false` value which is set for Windows platforms.

This fixes https://github.com/rust-lang/rust/issues/84933.
This commit is contained in:
bors 2023-03-29 16:20:37 +00:00
commit f98598c6cd
28 changed files with 262 additions and 95 deletions
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5
compiler/rustc_target/src/spec/mod.rs
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@ -1471,6 +1471,8 @@ pub struct TargetOptions {
pub features: StaticCow<str>,
/// Whether dynamic linking is available on this target. Defaults to false.
pub dynamic_linking: bool,
/// Whether dynamic linking can export TLS globals. Defaults to true.
pub dll_tls_export: bool,
/// If dynamic linking is available, whether only cdylibs are supported.
pub only_cdylib: bool,
/// Whether executables are available on this target. Defaults to true.
@ -1865,6 +1867,7 @@ impl Default for TargetOptions {
cpu: "generic".into(),
features: "".into(),
dynamic_linking: false,
dll_tls_export: true,
only_cdylib: false,
executables: true,
relocation_model: RelocModel::Pic,
@ -2537,6 +2540,7 @@ impl Target {
key!(cpu);
key!(features);
key!(dynamic_linking, bool);
key!(dll_tls_export, bool);
key!(only_cdylib, bool);
key!(executables, bool);
key!(relocation_model, RelocModel)?;
@ -2791,6 +2795,7 @@ impl ToJson for Target {
target_option_val!(cpu);
target_option_val!(features);
target_option_val!(dynamic_linking);
target_option_val!(dll_tls_export);
target_option_val!(only_cdylib);
target_option_val!(executables);
target_option_val!(relocation_model);