60 lines
2.3 KiB
Rust
60 lines
2.3 KiB
Rust
//! Throughout the compiler tree, there are several places which want to have
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//! access to state or queries while being inside crates that are dependencies
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//! of `rustc_middle`. To facilitate this, we have the
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//! `rustc_data_structures::AtomicRef` type, which allows us to setup a global
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//! static which can then be set in this file at program startup.
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//!
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//! See `SPAN_TRACK` for an example of how to set things up.
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//!
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//! The functions in this file should fall back to the default set in their
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//! origin crate when the `TyCtxt` is not present in TLS.
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use rustc_errors::{Diagnostic, TRACK_DIAGNOSTICS};
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use rustc_middle::ty::tls;
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use std::fmt;
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fn track_span_parent(def_id: rustc_span::def_id::LocalDefId) {
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tls::with_opt(|tcx| {
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if let Some(tcx) = tcx {
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let _span = tcx.source_span(def_id);
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// Sanity check: relative span's parent must be an absolute span.
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debug_assert_eq!(_span.data_untracked().parent, None);
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}
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})
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}
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/// This is a callback from `rustc_ast` as it cannot access the implicit state
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/// in `rustc_middle` otherwise. It is used when diagnostic messages are
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/// emitted and stores them in the current query, if there is one.
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fn track_diagnostic(diagnostic: &Diagnostic) {
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tls::with_context_opt(|icx| {
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if let Some(icx) = icx {
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if let Some(diagnostics) = icx.diagnostics {
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let mut diagnostics = diagnostics.lock();
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diagnostics.extend(Some(diagnostic.clone()));
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}
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}
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})
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}
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/// This is a callback from `rustc_hir` as it cannot access the implicit state
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/// in `rustc_middle` otherwise.
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fn def_id_debug(def_id: rustc_hir::def_id::DefId, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "DefId({}:{}", def_id.krate, def_id.index.index())?;
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tls::with_opt(|opt_tcx| {
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if let Some(tcx) = opt_tcx {
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write!(f, " ~ {}", tcx.def_path_debug_str(def_id))?;
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}
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Ok(())
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})?;
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write!(f, ")")
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}
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/// Sets up the callbacks in prior crates which we want to refer to the
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/// TyCtxt in.
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pub fn setup_callbacks() {
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rustc_span::SPAN_TRACK.swap(&(track_span_parent as fn(_)));
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rustc_hir::def_id::DEF_ID_DEBUG.swap(&(def_id_debug as fn(_, &mut fmt::Formatter<'_>) -> _));
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TRACK_DIAGNOSTICS.swap(&(track_diagnostic as fn(&_)));
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}
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