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| author | bors <bors@rust-lang.org> | 2021-05-12 11:05:56 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2021-05-12 11:05:56 +0000 |
| commit | e1ff91f439bc09f566da211c6449821b4e949279 (patch) | |
| tree | caf30c76d01ab56c1307a6a10d8f73cd8b925b7c /compiler/rustc_mir/src/transform/coverage/debug.rs | |
| parent | ac923d94f86a6f7c881ecbedcd0a68d7986a35bd (diff) | |
| parent | 37dbe868c92b16211ef2a670f9c9f457515f857b (diff) | |
| download | rust-e1ff91f439bc09f566da211c6449821b4e949279.tar.gz rust-e1ff91f439bc09f566da211c6449821b4e949279.zip | |
Auto merge of #83813 - cbeuw:remap-std, r=michaelwoerister
Fix `--remap-path-prefix` not correctly remapping `rust-src` component paths and unify handling of path mapping with virtualized paths
This PR fixes #73167 ("Binaries end up containing path to the rust-src component despite `--remap-path-prefix`") by preventing real local filesystem paths from reaching compilation output if the path is supposed to be remapped.
`RealFileName::Named` introduced in #72767 is now renamed as `LocalPath`, because this variant wraps a (most likely) valid local filesystem path.
`RealFileName::Devirtualized` is renamed as `Remapped` to be used for remapped path from a real path via `--remap-path-prefix` argument, as well as real path inferred from a virtualized (during compiler bootstrapping) `/rustc/...` path. The `local_path` field is now an `Option<PathBuf>`, as it will be set to `None` before serialisation, so it never reaches any build output. Attempting to serialise a non-`None` `local_path` will cause an assertion faliure.
When a path is remapped, a `RealFileName::Remapped` variant is created. The original path is preserved in `local_path` field and the remapped path is saved in `virtual_name` field. Previously, the `local_path` is directly modified which goes against its purpose of "suitable for reading from the file system on the local host".
`rustc_span::SourceFile`'s fields `unmapped_path` (introduced by #44940) and `name_was_remapped` (introduced by #41508 when `--remap-path-prefix` feature originally added) are removed, as these two pieces of information can be inferred from the `name` field: if it's anything other than a `FileName::Real(_)`, or if it is a `FileName::Real(RealFileName::LocalPath(_))`, then clearly `name_was_remapped` would've been false and `unmapped_path` would've been `None`. If it is a `FileName::Real(RealFileName::Remapped{local_path, virtual_name})`, then `name_was_remapped` would've been true and `unmapped_path` would've been `Some(local_path)`.
cc `@eddyb` who implemented `/rustc/...` path devirtualisation
Diffstat (limited to 'compiler/rustc_mir/src/transform/coverage/debug.rs')
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