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//! Some facilities for tracking how codegen-units are reused during incremental
//! compilation. This is used for incremental compilation tests and debug
//! output.
use rustc_data_structures::fx::FxHashMap;
use rustc_span::{Span, Symbol};
use std::sync::{Arc, Mutex};
use tracing::debug;
#[derive(Copy, Clone, Debug, PartialEq, PartialOrd)]
pub enum CguReuse {
No,
PreLto,
PostLto,
}
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum ComparisonKind {
Exact,
AtLeast,
}
struct TrackerData {
actual_reuse: FxHashMap<String, CguReuse>,
expected_reuse: FxHashMap<String, (String, SendSpan, CguReuse, ComparisonKind)>,
}
// Span does not implement `Send`, so we can't just store it in the shared
// `TrackerData` object. Instead of splitting up `TrackerData` into shared and
// non-shared parts (which would be complicated), we just mark the `Span` here
// explicitly as `Send`. That's safe because the span data here is only ever
// accessed from the main thread.
struct SendSpan(Span);
unsafe impl Send for SendSpan {}
#[derive(Clone)]
pub struct CguReuseTracker {
data: Option<Arc<Mutex<TrackerData>>>,
}
impl CguReuseTracker {
pub fn new() -> CguReuseTracker {
let data =
TrackerData { actual_reuse: Default::default(), expected_reuse: Default::default() };
CguReuseTracker { data: Some(Arc::new(Mutex::new(data))) }
}
pub fn new_disabled() -> CguReuseTracker {
CguReuseTracker { data: None }
}
pub fn set_actual_reuse(&self, cgu_name: &str, kind: CguReuse) {
if let Some(ref data) = self.data {
debug!("set_actual_reuse({cgu_name:?}, {kind:?})");
let prev_reuse = data.lock().unwrap().actual_reuse.insert(cgu_name.to_string(), kind);
if let Some(prev_reuse) = prev_reuse {
// The only time it is legal to overwrite reuse state is when
// we discover during ThinLTO that we can actually reuse the
// post-LTO version of a CGU.
assert_eq!(prev_reuse, CguReuse::PreLto);
}
}
}
pub fn set_expectation(
&self,
cgu_name: Symbol,
cgu_user_name: &str,
error_span: Span,
expected_reuse: CguReuse,
comparison_kind: ComparisonKind,
) {
if let Some(ref data) = self.data {
debug!("set_expectation({cgu_name:?}, {expected_reuse:?}, {comparison_kind:?})");
let mut data = data.lock().unwrap();
data.expected_reuse.insert(
cgu_name.to_string(),
(cgu_user_name.to_string(), SendSpan(error_span), expected_reuse, comparison_kind),
);
}
}
pub fn check_expected_reuse(&self, diag: &rustc_errors::Handler) {
if let Some(ref data) = self.data {
let data = data.lock().unwrap();
for (cgu_name, &(ref cgu_user_name, ref error_span, expected_reuse, comparison_kind)) in
&data.expected_reuse
{
if let Some(&actual_reuse) = data.actual_reuse.get(cgu_name) {
let (error, at_least) = match comparison_kind {
ComparisonKind::Exact => (expected_reuse != actual_reuse, false),
ComparisonKind::AtLeast => (actual_reuse < expected_reuse, true),
};
if error {
let at_least = if at_least { "at least " } else { "" };
let msg = format!(
"CGU-reuse for `{cgu_user_name}` is `{actual_reuse:?}` but \
should be {at_least}`{expected_reuse:?}`"
);
diag.span_err(error_span.0, &msg);
}
} else {
let msg = format!(
"CGU-reuse for `{cgu_user_name}` (mangled: `{cgu_name}`) was \
not recorded"
);
diag.span_fatal(error_span.0, &msg)
}
}
}
}
}
|
