Fix translation of external spans #42507
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eddyb
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Jun 7, 2017
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@bors r+ |
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📌 Commit 9a054f2 has been approved by |
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⌛ Testing commit 9a054f2 with merge 20b80ac... |
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💔 Test failed - status-travis |
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Jun 9, 2017
Fix translation of external spans Previously, I noticed that spans from external crates don't generate any output. This limitation is problematic if analysis is performed on one or more external crates, as is the case with [rust-semverver](https://github.com/ibabushkin/rust-semverver). This change should address this behaviour, with the potential drawback that a minor performance hit is to be expected, as spans from potentially large crates have to be translated now.
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andersk
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rust-lang/rust#42507 Signed-off-by: Anders Kaseorg <andersk@mit.edu>
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Jun 18, 2017
Implement lazy loading of external crates' sources. Fixes #38875 Fixes #38875. This is a follow-up to #42507. When a (now correctly translated) span from an external crate is referenced in a error, warning or info message, we still don't have the source code being referenced. Since stuffing the source in the serialized metadata of an rlib is extremely wasteful, the following scheme has been implemented: * File maps now contain a source hash that gets serialized as well. * When a span is rendered in a message, the source hash in the corresponding file map(s) is used to try and load the source from the corresponding file on disk. If the file is not found or the hashes don't match, the failed attempt is recorded (and not retried). * The machinery fetching source lines from file maps is augmented to use the lazily loaded external source as a secondary fallback for file maps belonging to external crates. This required a small change to the expected stderr of one UI test (it now renders a span, where previously was none). Further work can be done based on this - some of the machinery previously used to hide external spans is possibly obsolete and the hashing code can be reused in different places as well. r? @eddyb
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Previously, I noticed that spans from external crates don't generate any output. This limitation is problematic if analysis is performed on one or more external crates, as is the case with rust-semverver. This change should address this behaviour, with the potential drawback that a minor performance hit is to be expected, as spans from potentially large crates have to be translated now.