Rollup of 5 pull requests #59561
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Rollup of 5 pull requests #59561
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We were setting the same identifier for both the DW_TAG_structure_type and the DW_TAG_variant_part. This becomes a problem when using thinlto becauses it uses the identifier as a key for a map of types that is used to delete duplicates based on the ODR, so one of them is deleted as a duplicate, resulting in invalid DWARF. The DW_TAG_variant_part isn't a standalone type, so it doesn't need an identifier. Fix by omitting its identifier.
and bump llvm version in test
The existing `KeywordIdents` lint blindly scans the token stream for a macro or macro definition. It does not attempt to parse the input, which means it cannot distinguish between occurrences of `dyn` that are truly instances of it as an identifier (e.g. `let dyn = 3;`) versus occurrences that follow its usage as a contextual keyword (e.g. the type `Box<dyn Trait>`). In an ideal world the lint would parse the token stream in order to distinguish such occurrences; but in general we cannot do this, because a macro_rules definition does not specify what parsing contexts the macro being defined is allowed to be used within. So rather than put a lot of work into attempting to come up with a more precise but still incomplete solution, I am just taking the short cut of not linting any instance of `dyn` under a macro. This prevents `rustfix` from injecting bugs into legal 2015 edition code.
…ed as keyword in test. Back-story: After reflection this morning, I realized that the previous form of this test would allow the macro invocation to treat the `dyn` input as a raw-identifier rather than a keyword, and since the input was discarded by that version of the macro, the test would pass despite the detail that the input `dyn` should not have been parsed as a raw-identifier. This revision fixes that oversight, by actually *using* the macro input to construct a `Box<dyn Trait>` type.
Review feedback asked for the test to be generalized to include macros 2.0; that generalization is dyn-2015-idents-in-decl-macros-unlinted.rs As a drive-by, I also decided to revise the test to make it clear *why* we cannot generally lint these cases. (I already had similar demonstrations in dyn-2015-edition-keyword-ident-lint.rs, but it does not hurt to try to emphasize matters.) I also added some commentary on the cases where we could choose to make the lint smarter, namely the situations where a macro is *definitely* using `dyn` as an identifier (because it is using it as a path component).
miri needs to build std with xargo, which doesn't allow stable/beta: <japaric/xargo#204 (comment)> Therefore, at this time there's no point in making miri available on any but the nightly channel. If we get a stable way to build `std`, like [RFC 2663], then we can re-evaluate whether to start including miri, perhaps still as `miri-preview`. [RFC 2663]: rust-lang/rfcs#2663
…woerister rustc(codegen): uncache `def_symbol_name` prefix from `symbol_name`. The `def_symbol_name` query was an optimization to avoid recomputing the common part of a symbol name, as only the hash needs to be added to it for each symbol. However, rust-lang#57967 will add a new mangling scheme, which doesn't readily support this kind of reuse - while it's plausible, it requires a lot more effort, since you'd have to "symbolically evaluate" mangling, and keep it in a form where the backreference positions can be computed correctly in the final step. So I want to see how much time we're actually saving with this `def_symbol_name` optimization, nowadays. cc @michaelwoerister
…oerister Fix invalid DWARF for enums when using ThinLTO We were setting the same identifier for both the DW_TAG_structure_type and the DW_TAG_variant_part. This becomes a problem when using ThinLTO becauses it uses the identifier as a key for a map of types that is used to delete duplicates based on the ODR, so one of them is deleted as a duplicate, resulting in invalid DWARF. The DW_TAG_variant_part isn't a standalone type, so it doesn't need an identifier. Fix by omitting its identifier. ODR uniquing is [enabled here](https://github.com/rust-lang/rust/blob/f21dee2c6179276321a88a63300dce74ff707e92/src/rustllvm/PassWrapper.cpp#L1101).
…rd-lint-under-macros, r=matthewjasper skip dyn keyword lint under macros This PR is following my own intuition that `rustfix` should never inject bugs into working code (even if that comes at the expense of it failing to fix things that will become bugs). Fix rust-lang#56327
…ursion, r=eddyb Fix infinite recursion Temporary fix for rust-lang#59502. r? @eddyb
manifest: only include miri on the nightly channel miri needs to build std with xargo, which doesn't allow stable/beta: <japaric/xargo#204 (comment)> Therefore, at this time there's no point in making miri available on any but the nightly channel. If we get a stable way to build `std`, like [RFC 2663], then we can re-evaluate whether to start including miri, perhaps still as `miri-preview`. [RFC 2663]: rust-lang/rfcs#2663
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@bors r+ p=5 |
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Rollup of 5 pull requests Successful merges: - #59343 (rustc(codegen): uncache `def_symbol_name` prefix from `symbol_name`.) - #59380 (Fix invalid DWARF for enums when using ThinLTO) - #59463 (skip dyn keyword lint under macros) - #59539 (Fix infinite recursion) - #59544 (manifest: only include miri on the nightly channel) Failed merges: r? @ghost
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☀️ Test successful - checks-travis, status-appveyor |
This was referenced Mar 30, 2019
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Successful merges:
def_symbol_nameprefix fromsymbol_name. #59343 (rustc(codegen): uncachedef_symbol_nameprefix fromsymbol_name.)Failed merges:
r? @ghost