Struct rustc_mir_build::thir::pattern::PatCtxt

struct PatCtxt<'a, 'tcx> {
    tcx: TyCtxt<'tcx>,
    param_env: ParamEnv<'tcx>,
    typeck_results: &'a TypeckResults<'tcx>,
}

Fields

tcx: TyCtxt<'tcx>

param_env: ParamEnv<'tcx>

typeck_results: &'a TypeckResults<'tcx>

Implementations

impl<'a, 'tcx> PatCtxt<'a, 'tcx>

pub(super) fn const_to_pat( &self, cv: Const<'tcx>, id: HirId, span: Span, check_body_for_struct_match_violation: Option<DefId> ) -> Box<Pat<'tcx>>

Converts an evaluated constant to a pattern (if possible). This means aggregate values (like structs and enums) are converted to a pattern that matches the value (as if you’d compared via structural equality).

cv must be a valtree or a mir::ConstValue.

impl<'a, 'tcx> PatCtxt<'a, 'tcx>

fn lower_pattern(&mut self, pat: &'tcx Pat<'tcx>) -> Box<Pat<'tcx>>

fn lower_range_expr( &mut self, expr: &'tcx Expr<'tcx> ) -> (PatKind<'tcx>, Option<Ascription<'tcx>>)

fn lower_pattern_range( &mut self, ty: Ty<'tcx>, lo: Const<'tcx>, hi: Const<'tcx>, end: RangeEnd, span: Span, lo_expr: Option<&Expr<'tcx>>, hi_expr: Option<&Expr<'tcx>> ) -> PatKind<'tcx>

fn normalize_range_pattern_ends( &self, ty: Ty<'tcx>, lo: Option<&PatKind<'tcx>>, hi: Option<&PatKind<'tcx>> ) -> Option<(Const<'tcx>, Const<'tcx>)>

fn lower_pattern_unadjusted(&mut self, pat: &'tcx Pat<'tcx>) -> Box<Pat<'tcx>>

fn lower_tuple_subpats( &mut self, pats: &'tcx [Pat<'tcx>], expected_len: usize, gap_pos: DotDotPos ) -> Vec<FieldPat<'tcx>>

fn lower_patterns(&mut self, pats: &'tcx [Pat<'tcx>]) -> Box<[Box<Pat<'tcx>>]>

fn lower_opt_pattern( &mut self, pat: &'tcx Option<&'tcx Pat<'tcx>> ) -> Option<Box<Pat<'tcx>>>

fn slice_or_array_pattern( &mut self, span: Span, ty: Ty<'tcx>, prefix: &'tcx [Pat<'tcx>], slice: &'tcx Option<&'tcx Pat<'tcx>>, suffix: &'tcx [Pat<'tcx>] ) -> PatKind<'tcx>

fn lower_variant_or_leaf( &mut self, res: Res, hir_id: HirId, span: Span, ty: Ty<'tcx>, subpatterns: Vec<FieldPat<'tcx>> ) -> PatKind<'tcx>

fn lower_path( &mut self, qpath: &QPath<'_>, id: HirId, span: Span ) -> Box<Pat<'tcx>>

Takes a HIR Path. If the path is a constant, evaluates it and feeds it to const_to_pat. Any other path (like enum variants without fields) is converted to the corresponding pattern via lower_variant_or_leaf.

fn lower_inline_const( &mut self, block: &'tcx ConstBlock, id: HirId, span: Span ) -> PatKind<'tcx>

Converts inline const patterns.

fn lower_lit(&mut self, expr: &'tcx Expr<'tcx>) -> PatKind<'tcx>

Converts literals, paths and negation of literals to patterns. The special case for negation exists to allow things like -128_i8 which would overflow if we tried to evaluate 128_i8 and then negate afterwards.

Trait Implementations

impl<'tcx> UserAnnotatedTyHelpers<'tcx> for PatCtxt<'_, 'tcx>

fn tcx(&self) -> TyCtxt<'tcx>

fn typeck_results(&self) -> &TypeckResults<'tcx>

fn user_args_applied_to_ty_of_hir_id( &self, hir_id: HirId ) -> Option<CanonicalUserType<'tcx>>

Looks up the type associated with this hir-id and applies the user-given substitutions; the hir-id must map to a suitable type.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 24 bytes