Improve query cycle errors for parallel queries#56434
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src/librustc/ty/query/job.rs
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Isn't this early return check cheaper than the contains below?
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We want to return false here if query has already been visited instead of true.
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The job Click to expand the log.I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact |
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Thanks, @Zoxc! r=me with the nits addressed.
src/librustc/ty/query/job.rs
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This looks like things with no span would be preferred to things with span? Can you make no_span an integer so that one can easier see what's going on?
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Is let no_span = (span == DUMMY_SP) as u8 any better?
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I'd prefer something like:
// Sort span-less queries to the back
let span_cmp = if span == DUMMY_SPAN { 1 } else { 0 };
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This shouldn't be committed, I guess.
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I wouldn't mind it too much =P
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@bors r=michaelwoerister |
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📌 Commit 813b484 has been approved by |
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Improve query cycle errors for parallel queries r? @michaelwoerister
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Rollup of 7 pull requests Successful merges: - #56000 (Add Armv8-M Mainline targets) - #56250 (Introduce ptr::hash for references) - #56434 (Improve query cycle errors for parallel queries) - #56516 (Replace usages of `..i + 1` ranges with `..=i`.) - #56555 (Send textual profile data to stderr, not stdout) - #56561 (Fix bug in from_key_hashed_nocheck) - #56574 (Fix a stutter in the docs for slice::exact_chunks) Failed merges: r? @ghost
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| @@ -1942,8 +1942,12 @@ pub mod tls { | |||
| /// This is a callback from libsyntax as it cannot access the implicit state | |||
| /// in librustc otherwise | |||
| fn span_debug(span: syntax_pos::Span, f: &mut fmt::Formatter<'_>) -> fmt::Result { | |||
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I am confused, isn't this only used at the same time as the TLS TyCtxt is present?
How can with_opt give you None? Did that code change somehow?
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With parallel queries we set this on the worker threads when we create the thread pool. In that case it acts it's more like runtime linking and it will be set when no TyCtxt is around.
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Why not set it at the same time as the TyCtxt TLS?
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We need to set this on all worker threads, which we can easily do when creating the thread pool.
We could put it in ImplicitCtxt, but it would never change, so that would just make queries slower for no reason.
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In that case, can we make it so the debug callbacks are all set globally before entering even the global TyCtxt even without parallel queries?
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Maybe we just need a scoped_thread_local for the CodeMap? I feel like that would probably be a cleaner design.
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r? @michaelwoerister