bjoernager/rust
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Add TyCtx::env_var_os

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Along with `TyCtx::env_var` helper. These can be used to track
environment variable accesses in the query system.

Since `TyCtx::env_var_os` uses `OsStr`, this commit also adds the
necessary trait implementations for that to work.
This commit is contained in:
Mads Marquart 2025-03-26 15:46:05 +01:00
parent c772573708
commit 17db054141
6 changed files with 75 additions and 1 deletions
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16
compiler/rustc_middle/src/query/mod.rs
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@ -6,6 +6,7 @@
#![allow(unused_parens)]
use std::ffi::OsStr;
use std::mem;
use std::path::PathBuf;
use std::sync::Arc;
@ -119,6 +120,21 @@ rustc_queries! {
desc { "perform lints prior to AST lowering" }
}
/// Tracked access to environment variables.
///
/// Useful for the implementation of `std::env!`, `proc-macro`s change
/// detection and other changes in the compiler's behaviour that is easier
/// to control with an environment variable than a flag.
///
/// NOTE: This currently does not work with dependency info in the
/// analysis, codegen and linking passes, place extra code at the top of
/// `rustc_interface::passes::write_dep_info` to make that work.
query env_var_os(key: &'tcx OsStr) -> Option<&'tcx OsStr> {
// Environment variables are global state
eval_always
desc { "get the value of an environment variable" }
}
query resolutions(_: ()) -> &'tcx ty::ResolverGlobalCtxt {
no_hash
desc { "getting the resolver outputs" }