bjoernager/rust
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Track span dependency using a callback.

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This commit is contained in:
Camille GILLOT 2021-04-27 19:24:33 +02:00
parent e85ddeb474
commit b19ae20aad
6 changed files with 40 additions and 5 deletions
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16
compiler/rustc_span/src/span_encoding.rs
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@ -6,6 +6,7 @@
use crate::def_id::LocalDefId;
use crate::hygiene::SyntaxContext;
use crate::SPAN_TRACK;
use crate::{BytePos, SpanData};
use rustc_data_structures::fx::FxIndexSet;
@ -55,6 +56,10 @@ use rustc_data_structures::fx::FxIndexSet;
/// the code. No crates in `rustc-perf` need more than 15 bits for `ctxt`,
/// but larger crates might need more than 16 bits.
///
/// In order to reliably use parented spans in incremental compilation,
/// the dependency to the parent definition's span. This is performed
/// using the callback `SPAN_TRACK` to access the query engine.
///
#[derive(Clone, Copy, Eq, PartialEq, Hash)]
pub struct Span {
base_or_index: u32,
@ -96,6 +101,17 @@ impl Span {
#[inline]
pub fn data(self) -> SpanData {
let data = self.decode();
if let Some(parent) = data.parent {
(*SPAN_TRACK)(parent);
}
data
}
/// Internal function to translate between an encoded span and the expanded representation.
/// This function must not be used outside the incremental engine.
#[inline]
pub fn decode(self) -> SpanData {
if self.len_or_tag != LEN_TAG {
// Inline format.
debug_assert!(self.len_or_tag as u32 <= MAX_LEN);