| //! Defines lang items. | |
| //! | |
| //! Language items are items that represent concepts intrinsic to the language | |
| //! itself. Examples are: | |
| //! | |
| //! * Traits that specify "kinds"; e.g., `Sync`, `Send`. | |
| //! * Traits that represent operators; e.g., `Add`, `Sub`, `Index`. | |
| //! * Functions called by the compiler itself. | |
| use rustc_data_structures::fx::FxIndexMap; | |
| use rustc_data_structures::stable_hash::{StableHash, StableHashCtxt, StableHasher}; | |
| use rustc_macros::{BlobDecodable, Encodable, PrintAttribute, StableHash}; | |
| use rustc_span::{Symbol, kw, sym}; | |
| use crate::attrs::PrintAttribute; | |
| use crate::def_id::DefId; | |
| use crate::{MethodKind, Target}; | |
| /// All of the lang items, defined or not. | |
| /// Defined lang items can come from the current crate or its dependencies. | |
| #[derive(StableHash, Debug)] | |
| pub struct LanguageItems { | |
| /// Mappings from lang items to their possibly found [`DefId`]s. | |
| /// The index corresponds to the order in [`LangItem`]. | |
| items: [Option<DefId>; std::mem::variant_count::<LangItem>()], | |
| reverse_items: FxIndexMap<DefId, LangItem>, | |
| /// Lang items that were not found during collection. | |
| pub missing: Vec<LangItem>, | |
| } | |
| impl LanguageItems { | |
| /// Construct an empty collection of lang items and no missing ones. | |
| pub fn new() -> Self { | |
| Self { | |
| items: [None; std::mem::variant_count::<LangItem>()], | |
| reverse_items: FxIndexMap::default(), | |
| missing: Vec::new(), | |
| } | |
| } | |
| pub fn get(&self, item: LangItem) -> Option<DefId> { | |
| self.items[item as usize] | |
| } | |
| pub fn set(&mut self, item: LangItem, def_id: DefId) { | |
| self.items[item as usize] = Some(def_id); | |
| let preexisting = self.reverse_items.insert(def_id, item); | |
| // This needs to be a bijection. | |
| if let Some(preexisting) = preexisting { | |
| panic!( | |
| "For the bijection of LangItem <=> DefId to work,\ | |
| one item DefId may only be assigned one LangItem. \ | |
| Separate the LangItem definitions for {item:?} and {preexisting:?}." | |
| ); | |
| } | |
| } | |
| pub fn from_def_id(&self, def_id: DefId) -> Option<LangItem> { | |
| self.reverse_items.get(&def_id).copied() | |
| } | |
| pub fn iter(&self) -> impl Iterator<Item = (LangItem, DefId)> { | |
| self.items | |
| .iter() | |
| .enumerate() | |
| .filter_map(|(i, id)| id.map(|id| (LangItem::from_u32(i as u32).unwrap(), id))) | |
| } | |
| /// Remove any missing items from the list that aren't actually missing | |
| pub fn trim_missing(&mut self) { | |
| self.missing.retain(|&item| self.items[item as usize].is_none()); | |
| } | |
| } | |
| // The actual lang items defined come at the end of this file in one handy table. | |
| // So you probably just want to nip down to the end. | |
| macro_rules! language_item_table { | |
| ( | |
| $( $(#[$attr:meta])* $variant:ident, $module:ident :: $name:ident, $method:ident, $target:expr, $generics:expr; )* | |
| ) => { | |
| /// A representation of all the valid lang items in Rust. | |
| #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, Encodable, BlobDecodable, PrintAttribute)] | |
| pub enum LangItem { | |
| $( | |
| #[doc = concat!("The `", stringify!($name), "` lang item.")] | |
| $(#[$attr])* | |
| $variant, | |
| )* | |
| } | |
| impl LangItem { | |
| fn from_u32(u: u32) -> Option<LangItem> { | |
| // This implementation is clumsy, but makes no assumptions | |
| // about how discriminant tags are allocated within the | |
| // range `0 .. std::mem::variant_count::<LangItem>()`. | |
| $(if u == LangItem::$variant as u32 { | |
| return Some(LangItem::$variant) | |
| })* | |
| None | |
| } | |
| /// Returns the `name` symbol in `#[lang = "$name"]`. | |
| /// For example, [`LangItem::PartialEq`]`.name()` | |
| /// would result in [`sym::eq`] since it is `#[lang = "eq"]`. | |
| pub fn name(self) -> Symbol { | |
| match self { | |
| $( LangItem::$variant => $module::$name, )* | |
| } | |
| } | |
| /// Opposite of [`LangItem::name`] | |
| pub fn from_name(name: Symbol) -> Option<Self> { | |
| match name { | |
| $( $module::$name => Some(LangItem::$variant), )* | |
| _ => None, | |
| } | |
| } | |
| /// Returns the name of the `LangItem` enum variant. | |
| // This method is used by Clippy for internal lints. | |
| pub fn variant_name(self) -> &'static str { | |
| match self { | |
| $( LangItem::$variant => stringify!($variant), )* | |
| } | |
| } | |
| pub fn target(self) -> Target { | |
| match self { | |
| $( LangItem::$variant => $target, )* | |
| } | |
| } | |
| pub fn required_generics(&self) -> GenericRequirement { | |
| match self { | |
| $( LangItem::$variant => $generics, )* | |
| } | |
| } | |
| } | |
| impl LanguageItems { | |
| $( | |
| #[doc = concat!("Returns the [`DefId`] of the `", stringify!($name), "` lang item if it is defined.")] | |
| pub fn $method(&self) -> Option<DefId> { | |
| self.items[LangItem::$variant as usize] | |
| } | |
| )* | |
| } | |
| } | |
| } | |
| impl StableHash for LangItem { | |
| fn stable_hash<Hcx: StableHashCtxt>(&self, _: &mut Hcx, hasher: &mut StableHasher) { | |
| ::std::hash::Hash::hash(self, hasher); | |
| } | |
| } | |
| language_item_table! { | |
| // Variant name, Name, Getter method name, Target Generic requirements; | |
| Sized, sym::sized, sized_trait, Target::Trait, GenericRequirement::Exact(0); | |
| MetaSized, sym::meta_sized, meta_sized_trait, Target::Trait, GenericRequirement::Exact(0); | |
| PointeeSized, sym::pointee_sized, pointee_sized_trait, Target::Trait, GenericRequirement::Exact(0); | |
| Unsize, sym::unsize, unsize_trait, Target::Trait, GenericRequirement::Minimum(1); | |
| AlignOf, sym::mem_align_const, align_const, Target::AssocConst, GenericRequirement::Exact(0); | |
| SizeOf, sym::mem_size_const, size_const, Target::AssocConst, GenericRequirement::Exact(0); | |
| OffsetOf, sym::offset_of, offset_of, Target::Fn, GenericRequirement::Exact(1); | |
| /// Trait injected by `#[derive(PartialEq)]`, (i.e. "Partial EQ"). | |
| StructuralPeq, sym::structural_peq, structural_peq_trait, Target::Trait, GenericRequirement::None; | |
| Copy, sym::copy, copy_trait, Target::Trait, GenericRequirement::Exact(0); | |
| Clone, sym::clone, clone_trait, Target::Trait, GenericRequirement::None; | |
| CloneFn, sym::clone_fn, clone_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None; | |
| UseCloned, sym::use_cloned, use_cloned_trait, Target::Trait, GenericRequirement::None; | |
| TrivialClone, sym::trivial_clone, trivial_clone_trait, Target::Trait, GenericRequirement::None; | |
| Sync, sym::sync, sync_trait, Target::Trait, GenericRequirement::Exact(0); | |
| DiscriminantKind, sym::discriminant_kind, discriminant_kind_trait, Target::Trait, GenericRequirement::None; | |
| /// The associated item of the `DiscriminantKind` trait. | |
| Discriminant, sym::discriminant_type, discriminant_type, Target::AssocTy, GenericRequirement::None; | |
| PointeeTrait, sym::pointee_trait, pointee_trait, Target::Trait, GenericRequirement::None; | |
| Metadata, sym::metadata_type, metadata_type, Target::AssocTy, GenericRequirement::None; | |
| DynMetadata, sym::dyn_metadata, dyn_metadata, Target::Struct, GenericRequirement::None; | |
| Freeze, sym::freeze, freeze_trait, Target::Trait, GenericRequirement::Exact(0); | |
| UnsafeUnpin, sym::unsafe_unpin, unsafe_unpin_trait, Target::Trait, GenericRequirement::Exact(0); | |
| FnPtrTrait, sym::fn_ptr_trait, fn_ptr_trait, Target::Trait, GenericRequirement::Exact(0); | |
| FnPtrAddr, sym::fn_ptr_addr, fn_ptr_addr, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None; | |
| Drop, sym::drop, drop_trait, Target::Trait, GenericRequirement::None; | |
| Destruct, sym::destruct, destruct_trait, Target::Trait, GenericRequirement::None; | |
| AsyncDrop, sym::async_drop, async_drop_trait, Target::Trait, GenericRequirement::None; | |
| AsyncDropInPlace, sym::async_drop_in_place, async_drop_in_place_fn, Target::Fn, GenericRequirement::Exact(1); | |
| CoerceUnsized, sym::coerce_unsized, coerce_unsized_trait, Target::Trait, GenericRequirement::Minimum(1); | |
| DispatchFromDyn, sym::dispatch_from_dyn, dispatch_from_dyn_trait, Target::Trait, GenericRequirement::Minimum(1); | |
| TryAsDyn, sym::try_as_dyn, try_as_dyn, Target::Trait, GenericRequirement::Exact(1); | |
| // lang items relating to transmutability | |
| TransmuteOpts, sym::transmute_opts, transmute_opts, Target::Struct, GenericRequirement::Exact(0); | |
| TransmuteTrait, sym::transmute_trait, transmute_trait, Target::Trait, GenericRequirement::Exact(2); | |
| Add, sym::add, add_trait, Target::Trait, GenericRequirement::Exact(1); | |
| Sub, sym::sub, sub_trait, Target::Trait, GenericRequirement::Exact(1); | |
| Mul, sym::mul, mul_trait, Target::Trait, GenericRequirement::Exact(1); | |
| Div, sym::div, div_trait, Target::Trait, GenericRequirement::Exact(1); | |
| Rem, sym::rem, rem_trait, Target::Trait, GenericRequirement::Exact(1); | |
| Neg, sym::neg, neg_trait, Target::Trait, GenericRequirement::Exact(0); | |
| Not, sym::not, not_trait, Target::Trait, GenericRequirement::Exact(0); | |
| BitXor, sym::bitxor, bitxor_trait, Target::Trait, GenericRequirement::Exact(1); | |
| BitAnd, sym::bitand, bitand_trait, Target::Trait, GenericRequirement::Exact(1); | |
| BitOr, sym::bitor, bitor_trait, Target::Trait, GenericRequirement::Exact(1); | |
| Shl, sym::shl, shl_trait, Target::Trait, GenericRequirement::Exact(1); | |
| Shr, sym::shr, shr_trait, Target::Trait, GenericRequirement::Exact(1); | |
| AddAssign, sym::add_assign, add_assign_trait, Target::Trait, GenericRequirement::Exact(1); | |
| SubAssign, sym::sub_assign, sub_assign_trait, Target::Trait, GenericRequirement::Exact(1); | |
| MulAssign, sym::mul_assign, mul_assign_trait, Target::Trait, GenericRequirement::Exact(1); | |
| DivAssign, sym::div_assign, div_assign_trait, Target::Trait, GenericRequirement::Exact(1); | |
| RemAssign, sym::rem_assign, rem_assign_trait, Target::Trait, GenericRequirement::Exact(1); | |
| BitXorAssign, sym::bitxor_assign, bitxor_assign_trait, Target::Trait, GenericRequirement::Exact(1); | |
| BitAndAssign, sym::bitand_assign, bitand_assign_trait, Target::Trait, GenericRequirement::Exact(1); | |
| BitOrAssign, sym::bitor_assign, bitor_assign_trait, Target::Trait, GenericRequirement::Exact(1); | |
| ShlAssign, sym::shl_assign, shl_assign_trait, Target::Trait, GenericRequirement::Exact(1); | |
| ShrAssign, sym::shr_assign, shr_assign_trait, Target::Trait, GenericRequirement::Exact(1); | |
| Index, sym::index, index_trait, Target::Trait, GenericRequirement::Exact(1); | |
| IndexMut, sym::index_mut, index_mut_trait, Target::Trait, GenericRequirement::Exact(1); | |
| UnsafeCell, sym::unsafe_cell, unsafe_cell_type, Target::Struct, GenericRequirement::None; | |
| CovariantUnsafeCell, sym::covariant_unsafe_cell, covariant_unsafe_cell_type, Target::Struct, GenericRequirement::Exact(1); | |
| UnsafePinned, sym::unsafe_pinned, unsafe_pinned_type, Target::Struct, GenericRequirement::None; | |
| VaArgSafe, sym::va_arg_safe, va_arg_safe, Target::Trait, GenericRequirement::None; | |
| VaList, sym::va_list, va_list, Target::Struct, GenericRequirement::None; | |
| Deref, sym::deref, deref_trait, Target::Trait, GenericRequirement::Exact(0); | |
| DerefMut, sym::deref_mut, deref_mut_trait, Target::Trait, GenericRequirement::Exact(0); | |
| DerefPure, sym::deref_pure, deref_pure_trait, Target::Trait, GenericRequirement::Exact(0); | |
| DerefTarget, sym::deref_target, deref_target, Target::AssocTy, GenericRequirement::None; | |
| Receiver, sym::receiver, receiver_trait, Target::Trait, GenericRequirement::None; | |
| ReceiverTarget, sym::receiver_target, receiver_target, Target::AssocTy, GenericRequirement::None; | |
| LegacyReceiver, sym::legacy_receiver, legacy_receiver_trait, Target::Trait, GenericRequirement::None; | |
| Fn, kw::Fn, fn_trait, Target::Trait, GenericRequirement::Exact(1); | |
| FnMut, sym::fn_mut, fn_mut_trait, Target::Trait, GenericRequirement::Exact(1); | |
| FnOnce, sym::fn_once, fn_once_trait, Target::Trait, GenericRequirement::Exact(1); | |
| AsyncFn, sym::async_fn, async_fn_trait, Target::Trait, GenericRequirement::Exact(1); | |
| AsyncFnMut, sym::async_fn_mut, async_fn_mut_trait, Target::Trait, GenericRequirement::Exact(1); | |
| AsyncFnOnce, sym::async_fn_once, async_fn_once_trait, Target::Trait, GenericRequirement::Exact(1); | |
| AsyncFnOnceOutput, sym::async_fn_once_output, async_fn_once_output, Target::AssocTy, GenericRequirement::Exact(1); | |
| CallOnceFuture, sym::call_once_future, call_once_future, Target::AssocTy, GenericRequirement::Exact(1); | |
| CallRefFuture, sym::call_ref_future, call_ref_future, Target::AssocTy, GenericRequirement::Exact(2); | |
| AsyncFnKindHelper, sym::async_fn_kind_helper, async_fn_kind_helper, Target::Trait, GenericRequirement::Exact(1); | |
| AsyncFnKindUpvars, sym::async_fn_kind_upvars, async_fn_kind_upvars, Target::AssocTy, GenericRequirement::Exact(5); | |
| FnOnceOutput, sym::fn_once_output, fn_once_output, Target::AssocTy, GenericRequirement::None; | |
| Iterator, sym::iterator, iterator_trait, Target::Trait, GenericRequirement::Exact(0); | |
| FusedIterator, sym::fused_iterator, fused_iterator_trait, Target::Trait, GenericRequirement::Exact(0); | |
| Future, sym::future_trait, future_trait, Target::Trait, GenericRequirement::Exact(0); | |
| FutureOutput, sym::future_output, future_output, Target::AssocTy, GenericRequirement::Exact(0); | |
| AsyncIterator, sym::async_iterator, async_iterator_trait, Target::Trait, GenericRequirement::Exact(0); | |
| CoroutineState, sym::coroutine_state, coroutine_state, Target::Enum, GenericRequirement::None; | |
| Coroutine, sym::coroutine, coroutine_trait, Target::Trait, GenericRequirement::Exact(1); | |
| CoroutineReturn, sym::coroutine_return, coroutine_return, Target::AssocTy, GenericRequirement::Exact(1); | |
| CoroutineYield, sym::coroutine_yield, coroutine_yield, Target::AssocTy, GenericRequirement::Exact(1); | |
| CoroutineResume, sym::coroutine_resume, coroutine_resume, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None; | |
| Unpin, sym::unpin, unpin_trait, Target::Trait, GenericRequirement::None; | |
| Pin, sym::pin, pin_type, Target::Struct, GenericRequirement::None; | |
| OrderingEnum, sym::Ordering, ordering_enum, Target::Enum, GenericRequirement::Exact(0); | |
| PartialEq, sym::eq, eq_trait, Target::Trait, GenericRequirement::Exact(1); | |
| PartialOrd, sym::partial_ord, partial_ord_trait, Target::Trait, GenericRequirement::Exact(1); | |
| CVoid, sym::c_void, c_void, Target::Enum, GenericRequirement::None; | |
| Type, sym::type_info, type_struct, Target::Struct, GenericRequirement::None; | |
| TypeGeneric, sym::type_info_generic, type_generic, Target::Enum, GenericRequirement::None; | |
| TypeId, sym::type_id, type_id, Target::Struct, GenericRequirement::None; | |
| // A number of panic-related lang items. The `panic` item corresponds to divide-by-zero and | |
| // various panic cases with `match`. The `panic_bounds_check` item is for indexing arrays. | |
| // | |
| // The `begin_unwind` lang item has a predefined symbol name and is sort of a "weak lang item" | |
| // in the sense that a crate is not required to have it defined to use it, but a final product | |
| // is required to define it somewhere. Additionally, there are restrictions on crates that use | |
| // a weak lang item, but do not have it defined. | |
| Panic, sym::panic, panic_fn, Target::Fn, GenericRequirement::Exact(0); | |
| PanicNounwind, sym::panic_nounwind, panic_nounwind, Target::Fn, GenericRequirement::Exact(0); | |
| PanicFmt, sym::panic_fmt, panic_fmt, Target::Fn, GenericRequirement::None; | |
| PanicDisplay, sym::panic_display, panic_display, Target::Fn, GenericRequirement::None; | |
| ConstPanicFmt, sym::const_panic_fmt, const_panic_fmt, Target::Fn, GenericRequirement::None; | |
| PanicBoundsCheck, sym::panic_bounds_check, panic_bounds_check_fn, Target::Fn, GenericRequirement::Exact(0); | |
| PanicMisalignedPointerDereference, sym::panic_misaligned_pointer_dereference, panic_misaligned_pointer_dereference_fn, Target::Fn, GenericRequirement::Exact(0); | |
| PanicInfo, sym::panic_info, panic_info, Target::Struct, GenericRequirement::None; | |
| PanicLocation, sym::panic_location, panic_location, Target::Struct, GenericRequirement::None; | |
| PanicImpl, sym::panic_impl, panic_impl, Target::ForeignFn, GenericRequirement::None; | |
| PanicCannotUnwind, sym::panic_cannot_unwind, panic_cannot_unwind, Target::Fn, GenericRequirement::Exact(0); | |
| PanicInCleanup, sym::panic_in_cleanup, panic_in_cleanup, Target::Fn, GenericRequirement::Exact(0); | |
| /// Constant panic messages, used for codegen of MIR asserts. | |
| PanicAddOverflow, sym::panic_const_add_overflow, panic_const_add_overflow, Target::Fn, GenericRequirement::None; | |
| PanicSubOverflow, sym::panic_const_sub_overflow, panic_const_sub_overflow, Target::Fn, GenericRequirement::None; | |
| PanicMulOverflow, sym::panic_const_mul_overflow, panic_const_mul_overflow, Target::Fn, GenericRequirement::None; | |
| PanicDivOverflow, sym::panic_const_div_overflow, panic_const_div_overflow, Target::Fn, GenericRequirement::None; | |
| PanicRemOverflow, sym::panic_const_rem_overflow, panic_const_rem_overflow, Target::Fn, GenericRequirement::None; | |
| PanicNegOverflow, sym::panic_const_neg_overflow, panic_const_neg_overflow, Target::Fn, GenericRequirement::None; | |
| PanicShrOverflow, sym::panic_const_shr_overflow, panic_const_shr_overflow, Target::Fn, GenericRequirement::None; | |
| PanicShlOverflow, sym::panic_const_shl_overflow, panic_const_shl_overflow, Target::Fn, GenericRequirement::None; | |
| PanicDivZero, sym::panic_const_div_by_zero, panic_const_div_by_zero, Target::Fn, GenericRequirement::None; | |
| PanicRemZero, sym::panic_const_rem_by_zero, panic_const_rem_by_zero, Target::Fn, GenericRequirement::None; | |
| PanicCoroutineResumed, sym::panic_const_coroutine_resumed, panic_const_coroutine_resumed, Target::Fn, GenericRequirement::None; | |
| PanicAsyncFnResumed, sym::panic_const_async_fn_resumed, panic_const_async_fn_resumed, Target::Fn, GenericRequirement::None; | |
| PanicAsyncGenFnResumed, sym::panic_const_async_gen_fn_resumed, panic_const_async_gen_fn_resumed, Target::Fn, GenericRequirement::None; | |
| PanicGenFnNone, sym::panic_const_gen_fn_none, panic_const_gen_fn_none, Target::Fn, GenericRequirement::None; | |
| PanicCoroutineResumedPanic, sym::panic_const_coroutine_resumed_panic, panic_const_coroutine_resumed_panic, Target::Fn, GenericRequirement::None; | |
| PanicAsyncFnResumedPanic, sym::panic_const_async_fn_resumed_panic, panic_const_async_fn_resumed_panic, Target::Fn, GenericRequirement::None; | |
| PanicAsyncGenFnResumedPanic, sym::panic_const_async_gen_fn_resumed_panic, panic_const_async_gen_fn_resumed_panic, Target::Fn, GenericRequirement::None; | |
| PanicGenFnNonePanic, sym::panic_const_gen_fn_none_panic, panic_const_gen_fn_none_panic, Target::Fn, GenericRequirement::None; | |
| PanicNullPointerDereference, sym::panic_null_pointer_dereference, panic_null_pointer_dereference, Target::Fn, GenericRequirement::None; | |
| PanicNullReferenceConstructed, sym::panic_null_reference_constructed, panic_null_reference_constructed, Target::Fn, GenericRequirement::None; | |
| PanicInvalidEnumConstruction, sym::panic_invalid_enum_construction, panic_invalid_enum_construction, Target::Fn, GenericRequirement::None; | |
| PanicCoroutineResumedDrop, sym::panic_const_coroutine_resumed_drop, panic_const_coroutine_resumed_drop, Target::Fn, GenericRequirement::None; | |
| PanicAsyncFnResumedDrop, sym::panic_const_async_fn_resumed_drop, panic_const_async_fn_resumed_drop, Target::Fn, GenericRequirement::None; | |
| PanicAsyncGenFnResumedDrop, sym::panic_const_async_gen_fn_resumed_drop, panic_const_async_gen_fn_resumed_drop, Target::Fn, GenericRequirement::None; | |
| PanicGenFnNoneDrop, sym::panic_const_gen_fn_none_drop, panic_const_gen_fn_none_drop, Target::Fn, GenericRequirement::None; | |
| /// libstd panic entry point. Necessary for const eval to be able to catch it | |
| BeginPanic, sym::begin_panic, begin_panic_fn, Target::Fn, GenericRequirement::None; | |
| // Lang items needed for `format_args!()`. | |
| FormatArgument, sym::format_argument, format_argument, Target::Struct, GenericRequirement::None; | |
| FormatArguments, sym::format_arguments, format_arguments, Target::Struct, GenericRequirement::None; | |
| // Compiler-generated drop glue function, aka `core::ptr::drop_glue` | |
| DropGlue, sym::drop_glue, drop_glue_fn, Target::Fn, GenericRequirement::Exact(1); | |
| AllocLayout, sym::alloc_layout, alloc_layout, Target::Struct, GenericRequirement::None; | |
| /// For all binary crates without `#![no_main]`, Rust will generate a "main" function. | |
| /// The exact name and signature are target-dependent. The "main" function will invoke | |
| /// this lang item, passing it the `argc` and `argv` (or null, if those don't exist | |
| /// on the current target) as well as the user-defined `fn main` from the binary crate. | |
| Start, sym::start, start_fn, Target::Fn, GenericRequirement::Exact(1); | |
| EhPersonality, sym::eh_personality, eh_personality, Target::Fn, GenericRequirement::None; | |
| // Profiling markers for move/copy operations (used by -Z annotate-moves) | |
| CompilerMove, sym::compiler_move, compiler_move_fn, Target::Fn, GenericRequirement::Exact(2); | |
| CompilerCopy, sym::compiler_copy, compiler_copy_fn, Target::Fn, GenericRequirement::Exact(2); | |
| OwnedBox, sym::owned_box, owned_box, Target::Struct, GenericRequirement::Minimum(1); | |
| GlobalAlloc, sym::global_alloc_ty, global_alloc_ty, Target::Struct, GenericRequirement::None; | |
| PhantomData, sym::phantom_data, phantom_data, Target::Struct, GenericRequirement::Exact(1); | |
| ManuallyDrop, sym::manually_drop, manually_drop, Target::Struct, GenericRequirement::Exact(1); | |
| MaybeDangling, sym::maybe_dangling, maybe_dangling, Target::Struct, GenericRequirement::Exact(1); | |
| BikeshedGuaranteedNoDrop, sym::bikeshed_guaranteed_no_drop, bikeshed_guaranteed_no_drop, Target::Trait, GenericRequirement::Exact(0); | |
| MaybeUninit, sym::maybe_uninit, maybe_uninit, Target::Union, GenericRequirement::None; | |
| Termination, sym::termination, termination, Target::Trait, GenericRequirement::None; | |
| Try, sym::Try, try_trait, Target::Trait, GenericRequirement::None; | |
| Tuple, sym::tuple_trait, tuple_trait, Target::Trait, GenericRequirement::Exact(0); | |
| SliceLen, sym::slice_len_fn, slice_len_fn, Target::Method(MethodKind::Inherent), GenericRequirement::None; | |
| // Language items from AST lowering | |
| TryTraitFromResidual, sym::from_residual, from_residual_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None; | |
| TryTraitFromOutput, sym::from_output, from_output_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None; | |
| TryTraitBranch, sym::branch, branch_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None; | |
| TryTraitFromYeet, sym::from_yeet, from_yeet_fn, Target::Fn, GenericRequirement::None; | |
| ResidualIntoTryType, sym::into_try_type, into_try_type_fn, Target::Fn, GenericRequirement::None; | |
| CoercePointeeValidated, sym::coerce_pointee_validated, coerce_pointee_validated_trait, Target::Trait, GenericRequirement::Exact(0); | |
| ConstParamTy, sym::const_param_ty, const_param_ty_trait, Target::Trait, GenericRequirement::Exact(0); | |
| Poll, sym::Poll, poll, Target::Enum, GenericRequirement::None; | |
| PollReady, sym::Ready, poll_ready_variant, Target::Variant, GenericRequirement::None; | |
| PollPending, sym::Pending, poll_pending_variant, Target::Variant, GenericRequirement::None; | |
| AsyncGenReady, sym::AsyncGenReady, async_gen_ready, Target::Method(MethodKind::Inherent), GenericRequirement::Exact(1); | |
| AsyncGenPending, sym::AsyncGenPending, async_gen_pending, Target::AssocConst, GenericRequirement::Exact(1); | |
| AsyncGenFinished, sym::AsyncGenFinished, async_gen_finished, Target::AssocConst, GenericRequirement::Exact(1); | |
| // FIXME(swatinem): the following lang items are used for async lowering and | |
| // should become obsolete eventually. | |
| ResumeTy, sym::ResumeTy, resume_ty, Target::Struct, GenericRequirement::None; | |
| GetContext, sym::get_context, get_context_fn, Target::Fn, GenericRequirement::None; | |
| Context, sym::Context, context, Target::Struct, GenericRequirement::None; | |
| FuturePoll, sym::poll, future_poll_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None; | |
| AsyncIteratorPollNext, sym::async_iterator_poll_next, async_iterator_poll_next, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::Exact(0); | |
| IntoAsyncIterIntoIter, sym::into_async_iter_into_iter, into_async_iter_into_iter, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::Exact(0); | |
| Option, sym::Option, option_type, Target::Enum, GenericRequirement::None; | |
| OptionSome, sym::Some, option_some_variant, Target::Variant, GenericRequirement::None; | |
| OptionNone, sym::None, option_none_variant, Target::Variant, GenericRequirement::None; | |
| ResultOk, sym::Ok, result_ok_variant, Target::Variant, GenericRequirement::None; | |
| ResultErr, sym::Err, result_err_variant, Target::Variant, GenericRequirement::None; | |
| ControlFlowContinue, sym::Continue, cf_continue_variant, Target::Variant, GenericRequirement::None; | |
| ControlFlowBreak, sym::Break, cf_break_variant, Target::Variant, GenericRequirement::None; | |
| IntoFutureIntoFuture, sym::into_future, into_future_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None; | |
| IntoIterIntoIter, sym::into_iter, into_iter_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None; | |
| IteratorNext, sym::next, next_fn, Target::Method(MethodKind::Trait { body: false}), GenericRequirement::None; | |
| PinNewUnchecked, sym::new_unchecked, new_unchecked_fn, Target::Method(MethodKind::Inherent), GenericRequirement::None; | |
| RangeFrom, sym::RangeFrom, range_from_struct, Target::Struct, GenericRequirement::None; | |
| RangeFull, sym::RangeFull, range_full_struct, Target::Struct, GenericRequirement::None; | |
| RangeInclusiveStruct, sym::RangeInclusive, range_inclusive_struct, Target::Struct, GenericRequirement::None; | |
| RangeInclusiveNew, sym::range_inclusive_new, range_inclusive_new_method, Target::Method(MethodKind::Inherent), GenericRequirement::None; | |
| Range, sym::Range, range_struct, Target::Struct, GenericRequirement::None; | |
| RangeToInclusive, sym::RangeToInclusive, range_to_inclusive_struct, Target::Struct, GenericRequirement::None; | |
| RangeTo, sym::RangeTo, range_to_struct, Target::Struct, GenericRequirement::None; | |
| RangeMax, sym::RangeMax, range_max, Target::AssocConst, GenericRequirement::Exact(0); | |
| RangeMin, sym::RangeMin, range_min, Target::AssocConst, GenericRequirement::Exact(0); | |
| RangeSub, sym::RangeSub, range_sub, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::Exact(0); | |
| // `new_range` types that are `Copy + IntoIterator` | |
| RangeFromCopy, sym::RangeFromCopy, range_from_copy_struct, Target::Struct, GenericRequirement::None; | |
| RangeCopy, sym::RangeCopy, range_copy_struct, Target::Struct, GenericRequirement::None; | |
| RangeInclusiveCopy, sym::RangeInclusiveCopy, range_inclusive_copy_struct, Target::Struct, GenericRequirement::None; | |
| RangeToInclusiveCopy, sym::RangeToInclusiveCopy, range_to_inclusive_copy_struct, Target::Struct, GenericRequirement::None; | |
| String, sym::String, string, Target::Struct, GenericRequirement::None; | |
| CStr, sym::CStr, c_str, Target::Struct, GenericRequirement::None; | |
| // Experimental lang items for implementing contract pre- and post-condition checking. | |
| ContractBuildCheckEnsures, sym::contract_build_check_ensures, contract_build_check_ensures_fn, Target::Fn, GenericRequirement::None; | |
| ContractCheckRequires, sym::contract_check_requires, contract_check_requires_fn, Target::Fn, GenericRequirement::None; | |
| // Experimental lang items for `MCP: Low level components for async drop`(https://github.com/rust-lang/compiler-team/issues/727) | |
| DefaultTrait4, sym::default_trait4, default_trait4_trait, Target::Trait, GenericRequirement::None; | |
| DefaultTrait3, sym::default_trait3, default_trait3_trait, Target::Trait, GenericRequirement::None; | |
| DefaultTrait2, sym::default_trait2, default_trait2_trait, Target::Trait, GenericRequirement::None; | |
| DefaultTrait1, sym::default_trait1, default_trait1_trait, Target::Trait, GenericRequirement::None; | |
| ContractCheckEnsures, sym::contract_check_ensures, contract_check_ensures_fn, Target::Fn, GenericRequirement::None; | |
| // Reborrowing related lang-items | |
| Reborrow, sym::reborrow, reborrow, Target::Trait, GenericRequirement::Exact(0); | |
| CoerceShared, sym::coerce_shared, coerce_shared, Target::Trait, GenericRequirement::Exact(1); | |
| // Field representing types. | |
| FieldRepresentingType, sym::field_representing_type, field_representing_type, Target::Struct, GenericRequirement::Exact(3); | |
| Field, sym::field, field, Target::Trait, GenericRequirement::Exact(0); | |
| FieldBase, sym::field_base, field_base, Target::AssocTy, GenericRequirement::Exact(0); | |
| FieldType, sym::field_type, field_type, Target::AssocTy, GenericRequirement::Exact(0); | |
| FieldOffset, sym::field_offset, field_offset, Target::AssocConst, GenericRequirement::Exact(0); | |
| // Used to fallback `{float}` to `f32` when `f32: From<{float}>` | |
| From, sym::From, from_trait, Target::Trait, GenericRequirement::Exact(1); | |
| } | |
| /// The requirement imposed on the generics of a lang item | |
| pub enum GenericRequirement { | |
| /// No restriction on the generics | |
| None, | |
| /// A minimum number of generics that is demanded on a lang item | |
| Minimum(usize), | |
| /// The number of generics must match precisely as stipulated | |
| Exact(usize), | |
| } | |
| pub static FN_TRAITS: &'static [LangItem] = &[LangItem::Fn, LangItem::FnMut, LangItem::FnOnce]; | |
| pub static OPERATORS: &'static [LangItem] = &[ | |
| LangItem::Add, | |
| LangItem::Sub, | |
| LangItem::Mul, | |
| LangItem::Div, | |
| LangItem::Rem, | |
| LangItem::Neg, | |
| LangItem::Not, | |
| LangItem::BitXor, | |
| LangItem::BitAnd, | |
| LangItem::BitOr, | |
| LangItem::Shl, | |
| LangItem::Shr, | |
| LangItem::AddAssign, | |
| LangItem::SubAssign, | |
| LangItem::MulAssign, | |
| LangItem::DivAssign, | |
| LangItem::RemAssign, | |
| LangItem::BitXorAssign, | |
| LangItem::BitAndAssign, | |
| LangItem::BitOrAssign, | |
| LangItem::ShlAssign, | |
| LangItem::ShrAssign, | |
| LangItem::Index, | |
| LangItem::IndexMut, | |
| LangItem::PartialEq, | |
| LangItem::PartialOrd, | |
| ]; | |
| pub static BINARY_OPERATORS: &'static [LangItem] = &[ | |
| LangItem::Add, | |
| LangItem::Sub, | |
| LangItem::Mul, | |
| LangItem::Div, | |
| LangItem::Rem, | |
| LangItem::BitXor, | |
| LangItem::BitAnd, | |
| LangItem::BitOr, | |
| LangItem::Shl, | |
| LangItem::Shr, | |
| LangItem::AddAssign, | |
| LangItem::SubAssign, | |
| LangItem::MulAssign, | |
| LangItem::DivAssign, | |
| LangItem::RemAssign, | |
| LangItem::BitXorAssign, | |
| LangItem::BitAndAssign, | |
| LangItem::BitOrAssign, | |
| LangItem::ShlAssign, | |
| LangItem::ShrAssign, | |
| LangItem::Index, | |
| LangItem::IndexMut, | |
| LangItem::PartialEq, | |
| LangItem::PartialOrd, | |
| ]; |