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rustc_expand: Simplify span quoting in proc macro server

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- The `Rustc::expn_id` field kept redundant information
- `SyntaxContext` is no longer thrown away before `save_proc_macro_span` because it's thrown away during metadata encoding anyway
This commit is contained in:
Vadim Petrochenkov 2021-07-10 23:44:22 +03:00
parent de897f5205
commit ece6f68186
1 changed files with 9 additions and 26 deletions
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35
compiler/rustc_expand/src/proc_macro_server.rs
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@ -14,7 +14,6 @@ use rustc_parse::lexer::nfc_normalize;
use rustc_parse::{nt_to_tokenstream, parse_stream_from_source_str};
use rustc_session::parse::ParseSess;
use rustc_span::def_id::CrateNum;
use rustc_span::hygiene::ExpnId;
use rustc_span::hygiene::ExpnKind;
use rustc_span::symbol::{self, kw, sym, Symbol};
use rustc_span::{BytePos, FileName, MultiSpan, Pos, RealFileName, SourceFile, Span};
@ -363,26 +362,20 @@ pub(crate) struct Rustc<'a> {
mixed_site: Span,
span_debug: bool,
krate: CrateNum,
expn_id: ExpnId,
rebased_spans: FxHashMap<usize, Span>,
}
impl<'a> Rustc<'a> {
pub fn new(cx: &'a ExtCtxt<'_>) -> Self {
let expn_data = cx.current_expansion.id.expn_data();
let def_site = cx.with_def_site_ctxt(expn_data.def_site);
let call_site = cx.with_call_site_ctxt(expn_data.call_site);
let mixed_site = cx.with_mixed_site_ctxt(expn_data.call_site);
let sess = cx.parse_sess();
Rustc {
resolver: cx.resolver,
sess,
def_site,
call_site,
mixed_site,
sess: cx.parse_sess(),
def_site: cx.with_def_site_ctxt(expn_data.def_site),
call_site: cx.with_call_site_ctxt(expn_data.call_site),
mixed_site: cx.with_mixed_site_ctxt(expn_data.call_site),
span_debug: cx.ecfg.span_debug,
krate: expn_data.macro_def_id.unwrap().krate,
expn_id: cx.current_expansion.id,
rebased_spans: FxHashMap::default(),
}
}
@ -782,25 +775,15 @@ impl server::Span for Rustc<'_> {
/// span from the metadata of `my_proc_macro` (which we have access to,
/// since we've loaded `my_proc_macro` from disk in order to execute it).
/// In this way, we have obtained a span pointing into `my_proc_macro`
fn save_span(&mut self, mut span: Self::Span) -> usize {
// Throw away the `SyntaxContext`, since we currently
// skip serializing `SyntaxContext`s for proc-macro crates
span = span.with_ctxt(rustc_span::SyntaxContext::root());
fn save_span(&mut self, span: Self::Span) -> usize {
self.sess.save_proc_macro_span(span)
}
fn recover_proc_macro_span(&mut self, id: usize) -> Self::Span {
let resolver = self.resolver;
let krate = self.krate;
let expn_id = self.expn_id;
let (resolver, krate, def_site) = (self.resolver, self.krate, self.def_site);
*self.rebased_spans.entry(id).or_insert_with(|| {
let raw_span = resolver.get_proc_macro_quoted_span(krate, id);
// Ignore the deserialized `SyntaxContext` entirely.
// FIXME: Preserve the macro backtrace from the serialized span
// For example, if a proc-macro crate has code like
// `macro_one!() -> macro_two!() -> quote!()`, we might
// want to 'concatenate' this backtrace with the backtrace from
// our current call site.
raw_span.with_def_site_ctxt(expn_id)
// FIXME: `SyntaxContext` for spans from proc macro crates is lost during encoding,
// replace it with a def-site context until we are encoding it properly.
resolver.get_proc_macro_quoted_span(krate, id).with_ctxt(def_site.ctxt())
})
}
}