Feature gating *declarations* => new crate rustc_feature
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| // (name in cfg, feature, function to check if the feature is enabled) | ||
| (sym::target_thread_local, sym::cfg_target_thread_local, cfg_fn!(cfg_target_thread_local)), | ||
| (sym::target_has_atomic, sym::cfg_target_has_atomic, cfg_fn!(cfg_target_has_atomic)), | ||
| (sym::target_has_atomic_load_store, sym::cfg_target_has_atomic, cfg_fn!(cfg_target_has_atomic)), | ||
| ]; | ||
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| #[derive(Debug)] | ||
| pub struct GatedCfg { |
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why move away from a struct with field names to a tuple?
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If you look above, the constant contains the tuples already -- I'm introducing a type alias for that. The struct GatedCfg with span and index was actively harmful; imo it became clearly cleaner using .find(...) instead. Ostensibly we could store the constant as a list of structs instead, but it doesn't seem worth it given the number of times the type is referenced and used?
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📌 Commit ded177a has been approved by |
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🌲 The tree is currently closed for pull requests below priority 1000, this pull request will be tested once the tree is reopened |
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Feature gating *declarations* => new crate `rustc_feature` This PR moves the data-oriented parts of feature gating into its own crate, `rustc_feature`. The parts consist of some data types as well as `accepted`, `active`, `removed`, and `builtin_attrs`. Feature gate checking itself remains in `syntax::feature_gate::check`. The parts which define how to emit feature gate errors could probably be moved to `rustc_errors` or to the new `rustc_session` crate introduced in rust-lang#66878. The visitor itself could probably be moved as a pass in `rustc_passes` depending on how the dependency edges work out. The PR also contains some drive-by cleanup of feature gate checking. As such, the PR probably best read commit-by-commit. r? @oli-obk cc @petrochenkov cc @Mark-Simulacrum
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Rollup of 9 pull requests Successful merges: - #66612 (Initial implementation of or-pattern usefulness checking) - #66705 (Atomic as_mut_ptr) - #66759 (impl TrustedLen for vec::Drain) - #66858 (Use LLVMAddAnalysisPasses instead of Rust's wrapper) - #66870 (SimplifyArmIdentity only for locals with the same type) - #66883 (rustc_typeck: gate AnonConst's generics on feature(const_generics).) - #66889 (Make python-generated source files compatible with rustfmt) - #66894 (Remove unneeded prelude imports in libcore tests) - #66895 (Feature gating *declarations* => new crate `rustc_feature`) Failed merges: - #66905 (rustc_plugin: Remove some remaining plugin features) r? @ghost
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This PR moves the data-oriented parts of feature gating into its own crate,
rustc_feature.The parts consist of some data types as well as
accepted,active,removed, andbuiltin_attrs.Feature gate checking itself remains in
syntax::feature_gate::check. The parts which define how to emit feature gate errors could probably be moved torustc_errorsor to the newrustc_sessioncrate introduced in #66878. The visitor itself could probably be moved as a pass inrustc_passesdepending on how the dependency edges work out.The PR also contains some drive-by cleanup of feature gate checking. As such, the PR probably best read commit-by-commit.
r? @oli-obk
cc @petrochenkov
cc @Mark-Simulacrum