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Diffstat (limited to 'src/libsyntax/feature_gate/active.rs')
| -rw-r--r-- | src/libsyntax/feature_gate/active.rs | 549 |
1 files changed, 549 insertions, 0 deletions
diff --git a/src/libsyntax/feature_gate/active.rs b/src/libsyntax/feature_gate/active.rs new file mode 100644 index 00000000000..c947b09fdcb --- /dev/null +++ b/src/libsyntax/feature_gate/active.rs @@ -0,0 +1,549 @@ +//! List of the active feature gates. + +use crate::edition::Edition; +use crate::symbol::{Symbol, sym}; +use syntax_pos::Span; +use super::{State, Feature}; + +macro_rules! set { + ($field: ident) => {{ + fn f(features: &mut Features, _: Span) { + features.$field = true; + } + f as fn(&mut Features, Span) + }} +} + +macro_rules! declare_features { + ($( + $(#[doc = $doc:tt])* (active, $feature:ident, $ver:expr, $issue:expr, $edition:expr), + )+) => { + /// Represents active features that are currently being implemented or + /// currently being considered for addition/removal. + pub const ACTIVE_FEATURES: + &[Feature] = + &[$( + // (sym::$feature, $ver, $issue, $edition, set!($feature)) + Feature { + state: State::Active { set: set!($feature) }, + name: sym::$feature, + since: $ver, + issue: $issue, + edition: $edition, + description: concat!($($doc,)*), + } + ),+]; + + /// A set of features to be used by later passes. + #[derive(Clone)] + pub struct Features { + /// `#![feature]` attrs for language features, for error reporting + pub declared_lang_features: Vec<(Symbol, Span, Option<Symbol>)>, + /// `#![feature]` attrs for non-language (library) features + pub declared_lib_features: Vec<(Symbol, Span)>, + $( + $(#[doc = $doc])* + pub $feature: bool + ),+ + } + + impl Features { + pub fn new() -> Features { + Features { + declared_lang_features: Vec::new(), + declared_lib_features: Vec::new(), + $($feature: false),+ + } + } + + pub fn walk_feature_fields<F>(&self, mut f: F) + where F: FnMut(&str, bool) + { + $(f(stringify!($feature), self.$feature);)+ + } + } + }; +} + +impl Feature { + /// Set this feature in `Features`. Panics if called on a non-active feature. + pub fn set(&self, features: &mut Features, span: Span) { + match self.state { + State::Active { set } => set(features, span), + _ => panic!("Called `set` on feature `{}` which is not `active`", self.name) + } + } +} + +// If you change this, please modify `src/doc/unstable-book` as well. +// +// Don't ever remove anything from this list; move them to `removed.rs`. +// +// The version numbers here correspond to the version in which the current status +// was set. This is most important for knowing when a particular feature became +// stable (active). +// +// Note that the features are grouped into internal/user-facing and then +// sorted by version inside those groups. This is enforced with tidy. +// +// N.B., `tools/tidy/src/features.rs` parses this information directly out of the +// source, so take care when modifying it. + +declare_features! ( + // ------------------------------------------------------------------------- + // feature-group-start: internal feature gates + // ------------------------------------------------------------------------- + + // no-tracking-issue-start + + /// Allows using compiler's own crates. + (active, rustc_private, "1.0.0", Some(27812), None), + + /// Allows using the `rust-intrinsic`'s "ABI". + (active, intrinsics, "1.0.0", None, None), + + /// Allows using `#[lang = ".."]` attribute for linking items to special compiler logic. + (active, lang_items, "1.0.0", None, None), + + /// Allows using the `#[stable]` and `#[unstable]` attributes. + (active, staged_api, "1.0.0", None, None), + + /// Allows using `#[allow_internal_unstable]`. This is an + /// attribute on `macro_rules!` and can't use the attribute handling + /// below (it has to be checked before expansion possibly makes + /// macros disappear). + (active, allow_internal_unstable, "1.0.0", None, None), + + /// Allows using `#[allow_internal_unsafe]`. This is an + /// attribute on `macro_rules!` and can't use the attribute handling + /// below (it has to be checked before expansion possibly makes + /// macros disappear). + (active, allow_internal_unsafe, "1.0.0", None, None), + + /// Allows using the macros: + /// + `__diagnostic_used` + /// + `__register_diagnostic` + /// +`__build_diagnostic_array` + (active, rustc_diagnostic_macros, "1.0.0", None, None), + + /// Allows using `#[rustc_const_unstable(feature = "foo", ..)]` which + /// lets a function to be `const` when opted into with `#![feature(foo)]`. + (active, rustc_const_unstable, "1.0.0", None, None), + + /// no-tracking-issue-end + + /// Allows using `#[link_name="llvm.*"]`. + (active, link_llvm_intrinsics, "1.0.0", Some(29602), None), + + /// Allows using `rustc_*` attributes (RFC 572). + (active, rustc_attrs, "1.0.0", Some(29642), None), + + /// Allows using `#[on_unimplemented(..)]` on traits. + (active, on_unimplemented, "1.0.0", Some(29628), None), + + /// Allows using the `box $expr` syntax. + (active, box_syntax, "1.0.0", Some(49733), None), + + /// Allows using `#[main]` to replace the entrypoint `#[lang = "start"]` calls. + (active, main, "1.0.0", Some(29634), None), + + /// Allows using `#[start]` on a function indicating that it is the program entrypoint. + (active, start, "1.0.0", Some(29633), None), + + /// Allows using the `#[fundamental]` attribute. + (active, fundamental, "1.0.0", Some(29635), None), + + /// Allows using the `rust-call` ABI. + (active, unboxed_closures, "1.0.0", Some(29625), None), + + /// Allows using the `#[linkage = ".."]` attribute. + (active, linkage, "1.0.0", Some(29603), None), + + /// Allows features specific to OIBIT (auto traits). + (active, optin_builtin_traits, "1.0.0", Some(13231), None), + + /// Allows using `box` in patterns (RFC 469). + (active, box_patterns, "1.0.0", Some(29641), None), + + // no-tracking-issue-start + + /// Allows using `#[prelude_import]` on glob `use` items. + (active, prelude_import, "1.2.0", None, None), + + // no-tracking-issue-end + + // no-tracking-issue-start + + /// Allows using `#[omit_gdb_pretty_printer_section]`. + (active, omit_gdb_pretty_printer_section, "1.5.0", None, None), + + /// Allows using the `vectorcall` ABI. + (active, abi_vectorcall, "1.7.0", None, None), + + // no-tracking-issue-end + + /// Allows using `#[structural_match]` which indicates that a type is structurally matchable. + (active, structural_match, "1.8.0", Some(31434), None), + + /// Allows using the `may_dangle` attribute (RFC 1327). + (active, dropck_eyepatch, "1.10.0", Some(34761), None), + + /// Allows using the `#![panic_runtime]` attribute. + (active, panic_runtime, "1.10.0", Some(32837), None), + + /// Allows declaring with `#![needs_panic_runtime]` that a panic runtime is needed. + (active, needs_panic_runtime, "1.10.0", Some(32837), None), + + // no-tracking-issue-start + + /// Allows identifying the `compiler_builtins` crate. + (active, compiler_builtins, "1.13.0", None, None), + + /// Allows using the `unadjusted` ABI; perma-unstable. + (active, abi_unadjusted, "1.16.0", None, None), + + /// Allows identifying crates that contain sanitizer runtimes. + (active, sanitizer_runtime, "1.17.0", None, None), + + /// Used to identify crates that contain the profiler runtime. + (active, profiler_runtime, "1.18.0", None, None), + + /// Allows using the `thiscall` ABI. + (active, abi_thiscall, "1.19.0", None, None), + + /// Allows using `#![needs_allocator]`, an implementation detail of `#[global_allocator]`. + (active, allocator_internals, "1.20.0", None, None), + + // no-tracking-issue-end + + /// Added for testing E0705; perma-unstable. + (active, test_2018_feature, "1.31.0", Some(0), Some(Edition::Edition2018)), + + // ------------------------------------------------------------------------- + // feature-group-end: internal feature gates + // ------------------------------------------------------------------------- + + // ------------------------------------------------------------------------- + // feature-group-start: actual feature gates (target features) + // ------------------------------------------------------------------------- + + // FIXME: Document these and merge with the list below. + + // Unstable `#[target_feature]` directives. + (active, arm_target_feature, "1.27.0", Some(44839), None), + (active, aarch64_target_feature, "1.27.0", Some(44839), None), + (active, hexagon_target_feature, "1.27.0", Some(44839), None), + (active, powerpc_target_feature, "1.27.0", Some(44839), None), + (active, mips_target_feature, "1.27.0", Some(44839), None), + (active, avx512_target_feature, "1.27.0", Some(44839), None), + (active, mmx_target_feature, "1.27.0", Some(44839), None), + (active, sse4a_target_feature, "1.27.0", Some(44839), None), + (active, tbm_target_feature, "1.27.0", Some(44839), None), + (active, wasm_target_feature, "1.30.0", Some(44839), None), + (active, adx_target_feature, "1.32.0", Some(44839), None), + (active, cmpxchg16b_target_feature, "1.32.0", Some(44839), None), + (active, movbe_target_feature, "1.34.0", Some(44839), None), + (active, rtm_target_feature, "1.35.0", Some(44839), None), + (active, f16c_target_feature, "1.36.0", Some(44839), None), + + // ------------------------------------------------------------------------- + // feature-group-end: actual feature gates (target features) + // ------------------------------------------------------------------------- + + // ------------------------------------------------------------------------- + // feature-group-start: actual feature gates + // ------------------------------------------------------------------------- + + /// Allows using the `#[link_args]` attribute. + (active, link_args, "1.0.0", Some(29596), None), + + /// Allows defining identifiers beyond ASCII. + (active, non_ascii_idents, "1.0.0", Some(55467), None), + + /// Allows using `#[plugin_registrar]` on functions. + (active, plugin_registrar, "1.0.0", Some(29597), None), + + /// Allows using `#![plugin(myplugin)]`. + (active, plugin, "1.0.0", Some(29597), None), + + /// Allows using `#[thread_local]` on `static` items. + (active, thread_local, "1.0.0", Some(29594), None), + + /// Allows the use of SIMD types in functions declared in `extern` blocks. + (active, simd_ffi, "1.0.0", Some(27731), None), + + /// Allows using custom attributes (RFC 572). + (active, custom_attribute, "1.0.0", Some(29642), None), + + /// Allows using non lexical lifetimes (RFC 2094). + (active, nll, "1.0.0", Some(43234), None), + + /// Allows using slice patterns. + (active, slice_patterns, "1.0.0", Some(62254), None), + + /// Allows the definition of `const` functions with some advanced features. + (active, const_fn, "1.2.0", Some(57563), None), + + /// Allows associated type defaults. + (active, associated_type_defaults, "1.2.0", Some(29661), None), + + /// Allows `#![no_core]`. + (active, no_core, "1.3.0", Some(29639), None), + + /// Allows default type parameters to influence type inference. + (active, default_type_parameter_fallback, "1.3.0", Some(27336), None), + + /// Allows `repr(simd)` and importing the various simd intrinsics. + (active, repr_simd, "1.4.0", Some(27731), None), + + /// Allows `extern "platform-intrinsic" { ... }`. + (active, platform_intrinsics, "1.4.0", Some(27731), None), + + /// Allows `#[unwind(..)]`. + /// + /// Permits specifying whether a function should permit unwinding or abort on unwind. + (active, unwind_attributes, "1.4.0", Some(58760), None), + + /// Allows `#[no_debug]`. + (active, no_debug, "1.5.0", Some(29721), None), + + /// Allows attributes on expressions and non-item statements. + (active, stmt_expr_attributes, "1.6.0", Some(15701), None), + + /// Allows the use of type ascription in expressions. + (active, type_ascription, "1.6.0", Some(23416), None), + + /// Allows `cfg(target_thread_local)`. + (active, cfg_target_thread_local, "1.7.0", Some(29594), None), + + /// Allows specialization of implementations (RFC 1210). + (active, specialization, "1.7.0", Some(31844), None), + + /// Allows using `#[naked]` on functions. + (active, naked_functions, "1.9.0", Some(32408), None), + + /// Allows `cfg(target_has_atomic = "...")`. + (active, cfg_target_has_atomic, "1.9.0", Some(32976), None), + + /// Allows `X..Y` patterns. + (active, exclusive_range_pattern, "1.11.0", Some(37854), None), + + /// Allows the `!` type. Does not imply 'exhaustive_patterns' (below) any more. + (active, never_type, "1.13.0", Some(35121), None), + + /// Allows exhaustive pattern matching on types that contain uninhabited types. + (active, exhaustive_patterns, "1.13.0", Some(51085), None), + + /// Allows untagged unions `union U { ... }`. + (active, untagged_unions, "1.13.0", Some(32836), None), + + /// Allows `#[link(..., cfg(..))]`. + (active, link_cfg, "1.14.0", Some(37406), None), + + /// Allows `extern "ptx-*" fn()`. + (active, abi_ptx, "1.15.0", Some(38788), None), + + /// Allows the `#[repr(i128)]` attribute for enums. + (active, repr128, "1.16.0", Some(35118), None), + + /// Allows `#[link(kind="static-nobundle"...)]`. + (active, static_nobundle, "1.16.0", Some(37403), None), + + /// Allows `extern "msp430-interrupt" fn()`. + (active, abi_msp430_interrupt, "1.16.0", Some(38487), None), + + /// Allows declarative macros 2.0 (`macro`). + (active, decl_macro, "1.17.0", Some(39412), None), + + /// Allows `extern "x86-interrupt" fn()`. + (active, abi_x86_interrupt, "1.17.0", Some(40180), None), + + /// Allows overlapping impls of marker traits. + (active, overlapping_marker_traits, "1.18.0", Some(29864), None), + + /// Allows a test to fail without failing the whole suite. + (active, allow_fail, "1.19.0", Some(46488), None), + + /// Allows unsized tuple coercion. + (active, unsized_tuple_coercion, "1.20.0", Some(42877), None), + + /// Allows defining generators. + (active, generators, "1.21.0", Some(43122), None), + + /// Allows `#[doc(cfg(...))]`. + (active, doc_cfg, "1.21.0", Some(43781), None), + + /// Allows `#[doc(masked)]`. + (active, doc_masked, "1.21.0", Some(44027), None), + + /// Allows `#[doc(spotlight)]`. + (active, doc_spotlight, "1.22.0", Some(45040), None), + + /// Allows `#[doc(include = "some-file")]`. + (active, external_doc, "1.22.0", Some(44732), None), + + /// Allows future-proofing enums/structs with the `#[non_exhaustive]` attribute (RFC 2008). + (active, non_exhaustive, "1.22.0", Some(44109), None), + + /// Allows using `crate` as visibility modifier, synonymous with `pub(crate)`. + (active, crate_visibility_modifier, "1.23.0", Some(53120), None), + + /// Allows defining `extern type`s. + (active, extern_types, "1.23.0", Some(43467), None), + + /// Allows trait methods with arbitrary self types. + (active, arbitrary_self_types, "1.23.0", Some(44874), None), + + /// Allows in-band quantification of lifetime bindings (e.g., `fn foo(x: &'a u8) -> &'a u8`). + (active, in_band_lifetimes, "1.23.0", Some(44524), None), + + /// Allows associated types to be generic, e.g., `type Foo<T>;` (RFC 1598). + (active, generic_associated_types, "1.23.0", Some(44265), None), + + /// Allows defining `trait X = A + B;` alias items. + (active, trait_alias, "1.24.0", Some(41517), None), + + /// Allows infering `'static` outlives requirements (RFC 2093). + (active, infer_static_outlives_requirements, "1.26.0", Some(54185), None), + + /// Allows macro invocations in `extern {}` blocks. + (active, macros_in_extern, "1.27.0", Some(49476), None), + + /// Allows accessing fields of unions inside `const` functions. + (active, const_fn_union, "1.27.0", Some(51909), None), + + /// Allows casting raw pointers to `usize` during const eval. + (active, const_raw_ptr_to_usize_cast, "1.27.0", Some(51910), None), + + /// Allows dereferencing raw pointers during const eval. + (active, const_raw_ptr_deref, "1.27.0", Some(51911), None), + + /// Allows comparing raw pointers during const eval. + (active, const_compare_raw_pointers, "1.27.0", Some(53020), None), + + /// Allows `#[doc(alias = "...")]`. + (active, doc_alias, "1.27.0", Some(50146), None), + + /// Allows inconsistent bounds in where clauses. + (active, trivial_bounds, "1.28.0", Some(48214), None), + + /// Allows `'a: { break 'a; }`. + (active, label_break_value, "1.28.0", Some(48594), None), + + /// Allows using `#[doc(keyword = "...")]`. + (active, doc_keyword, "1.28.0", Some(51315), None), + + /// Allows reinterpretation of the bits of a value of one type as another + /// type during const eval. + (active, const_transmute, "1.29.0", Some(53605), None), + + /// Allows using `try {...}` expressions. + (active, try_blocks, "1.29.0", Some(31436), None), + + /// Allows defining an `#[alloc_error_handler]`. + (active, alloc_error_handler, "1.29.0", Some(51540), None), + + /// Allows using the `amdgpu-kernel` ABI. + (active, abi_amdgpu_kernel, "1.29.0", Some(51575), None), + + /// Allows panicking during const eval (producing compile-time errors). + (active, const_panic, "1.30.0", Some(51999), None), + + /// Allows `#[marker]` on certain traits allowing overlapping implementations. + (active, marker_trait_attr, "1.30.0", Some(29864), None), + + /// Allows macro invocations on modules expressions and statements and + /// procedural macros to expand to non-items. + (active, proc_macro_hygiene, "1.30.0", Some(54727), None), + + /// Allows unsized rvalues at arguments and parameters. + (active, unsized_locals, "1.30.0", Some(48055), None), + + /// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`. + (active, custom_test_frameworks, "1.30.0", Some(50297), None), + + /// Allows non-builtin attributes in inner attribute position. + (active, custom_inner_attributes, "1.30.0", Some(54726), None), + + /// Allows mixing bind-by-move in patterns and references to those identifiers in guards. + (active, bind_by_move_pattern_guards, "1.30.0", Some(15287), None), + + /// Allows `impl Trait` in bindings (`let`, `const`, `static`). + (active, impl_trait_in_bindings, "1.30.0", Some(63065), None), + + /// Allows using `reason` in lint attributes and the `#[expect(lint)]` lint check. + (active, lint_reasons, "1.31.0", Some(54503), None), + + /// Allows exhaustive integer pattern matching on `usize` and `isize`. + (active, precise_pointer_size_matching, "1.32.0", Some(56354), None), + + /// Allows relaxing the coherence rules such that + /// `impl<T> ForeignTrait<LocalType> for ForeignType<T> is permitted. + (active, re_rebalance_coherence, "1.32.0", Some(55437), None), + + /// Allows using `#[ffi_returns_twice]` on foreign functions. + (active, ffi_returns_twice, "1.34.0", Some(58314), None), + + /// Allows const generic types (e.g. `struct Foo<const N: usize>(...);`). + (active, const_generics, "1.34.0", Some(44580), None), + + /// Allows using `#[optimize(X)]`. + (active, optimize_attribute, "1.34.0", Some(54882), None), + + /// Allows using C-variadics. + (active, c_variadic, "1.34.0", Some(44930), None), + + /// Allows the user of associated type bounds. + (active, associated_type_bounds, "1.34.0", Some(52662), None), + + /// Attributes on formal function params. + (active, param_attrs, "1.36.0", Some(60406), None), + + /// Allows calling constructor functions in `const fn`. + (active, const_constructor, "1.37.0", Some(61456), None), + + /// Allows `if/while p && let q = r && ...` chains. + (active, let_chains, "1.37.0", Some(53667), None), + + /// Allows #[repr(transparent)] on enums (RFC 2645). + (active, transparent_enums, "1.37.0", Some(60405), None), + + /// Allows #[repr(transparent)] on unions (RFC 2645). + (active, transparent_unions, "1.37.0", Some(60405), None), + + /// Allows explicit discriminants on non-unit enum variants. + (active, arbitrary_enum_discriminant, "1.37.0", Some(60553), None), + + /// Allows `impl Trait` with multiple unrelated lifetimes. + (active, member_constraints, "1.37.0", Some(61977), None), + + /// Allows `async || body` closures. + (active, async_closure, "1.37.0", Some(62290), None), + + /// Allows the use of `#[cfg(doctest)]`, set when rustdoc is collecting doctests + (active, cfg_doctest, "1.37.0", Some(62210), None), + + /// Allows `[x; N]` where `x` is a constant (RFC 2203). + (active, const_in_array_repeat_expressions, "1.37.0", Some(49147), None), + + /// Allows `impl Trait` to be used inside type aliases (RFC 2515). + (active, type_alias_impl_trait, "1.38.0", Some(63063), None), + + /// Allows the use of or-patterns, e.g. `0 | 1`. + (active, or_patterns, "1.38.0", Some(54883), None), + + // ------------------------------------------------------------------------- + // feature-group-end: actual feature gates + // ------------------------------------------------------------------------- +); + +/// Some features are known to be incomplete and using them is likely to have +/// unanticipated results, such as compiler crashes. We warn the user about these +/// to alert them. +pub const INCOMPLETE_FEATURES: &[Symbol] = &[ + sym::impl_trait_in_bindings, + sym::generic_associated_types, + sym::const_generics, + sym::or_patterns, + sym::let_chains, +]; |