Struct rustc_mir_build::thir::pattern::check_match::MatchVisitor

struct MatchVisitor<'p, 'tcx> {
    tcx: TyCtxt<'tcx>,
    param_env: ParamEnv<'tcx>,
    typeck_results: &'tcx TypeckResults<'tcx>,
    thir: &'p Thir<'tcx>,
    lint_level: HirId,
    let_source: LetSource,
    pattern_arena: &'p TypedArena<DeconstructedPat<'p, 'tcx>>,
    dropless_arena: &'p DroplessArena,
    error: Result<(), ErrorGuaranteed>,
}

Fields

tcx: TyCtxt<'tcx>

param_env: ParamEnv<'tcx>

typeck_results: &'tcx TypeckResults<'tcx>

thir: &'p Thir<'tcx>

lint_level: HirId

let_source: LetSource

pattern_arena: &'p TypedArena<DeconstructedPat<'p, 'tcx>>

dropless_arena: &'p DroplessArena

error: Result<(), ErrorGuaranteed>

Tracks if we encountered an error while checking this body. That the first function to report it stores it here. Some functions return Result to allow callers to short-circuit on error, but callers don’t need to store it here again.

Implementations

impl<'p, 'tcx> MatchVisitor<'p, 'tcx>

fn with_let_source(&mut self, let_source: LetSource, f: impl FnOnce(&mut Self))

fn with_lint_level<T>( &mut self, new_lint_level: LintLevel, f: impl FnOnce(&mut Self) -> T, ) -> T

fn visit_land( &mut self, ex: &'p Expr<'tcx>, accumulator: &mut Vec<Option<(Span, RefutableFlag)>>, ) -> Result<(), ErrorGuaranteed>

Visit a nested chain of &&. Used for if-let chains. This must call visit_expr on the subexpressions we are not handling ourselves.

fn visit_land_rhs( &mut self, ex: &'p Expr<'tcx>, ) -> Result<Option<(Span, RefutableFlag)>, ErrorGuaranteed>

Visit the right-hand-side of a &&. Used for if-let chains. Returns Some if the expression was ultimately a let ... = ..., and None if it was a normal boolean expression. This must call visit_expr on the subexpressions we are not handling ourselves.

fn lower_pattern( &mut self, cx: &PatCtxt<'p, 'tcx>, pat: &'p Pat<'tcx>, ) -> Result<&'p DeconstructedPat<'p, 'tcx>, ErrorGuaranteed>

fn is_known_valid_scrutinee(&self, scrutinee: &Expr<'tcx>) -> bool

Inspects the match scrutinee expression to determine whether the place it evaluates to may hold invalid data.

fn new_cx( &self, refutability: RefutableFlag, whole_match_span: Option<Span>, scrutinee: Option<&Expr<'tcx>>, scrut_span: Span, ) -> PatCtxt<'p, 'tcx>

fn analyze_patterns( &mut self, cx: &PatCtxt<'p, 'tcx>, arms: &[MatchArm<'p, 'tcx>], scrut_ty: Ty<'tcx>, ) -> Result<UsefulnessReport<'p, 'tcx>, ErrorGuaranteed>

fn check_let( &mut self, pat: &'p Pat<'tcx>, scrutinee: Option<ExprId>, span: Span, )

fn check_match( &mut self, scrut: ExprId, arms: &[ArmId], source: MatchSource, expr_span: Span, )

fn check_let_chain( &mut self, chain_refutabilities: Vec<Option<(Span, RefutableFlag)>>, whole_chain_span: Span, )

fn analyze_binding( &mut self, pat: &'p Pat<'tcx>, refutability: RefutableFlag, scrut: Option<&Expr<'tcx>>, ) -> Result<(PatCtxt<'p, 'tcx>, UsefulnessReport<'p, 'tcx>), ErrorGuaranteed>

fn is_let_irrefutable( &mut self, pat: &'p Pat<'tcx>, scrut: Option<&Expr<'tcx>>, ) -> Result<RefutableFlag, ErrorGuaranteed>

fn check_binding_is_irrefutable( &mut self, pat: &'p Pat<'tcx>, origin: &str, scrut: Option<&Expr<'tcx>>, sp: Option<Span>, )

Trait Implementations

impl<'p, 'tcx> Visitor<'p, 'tcx> for MatchVisitor<'p, 'tcx>

fn thir(&self) -> &'p Thir<'tcx>

fn visit_arm(&mut self, arm: &'p Arm<'tcx>)

fn visit_expr(&mut self, ex: &'p Expr<'tcx>)

fn visit_stmt(&mut self, stmt: &'p Stmt<'tcx>)

fn visit_block(&mut self, block: &'thir Block)

fn visit_pat(&mut self, pat: &'thir Pat<'tcx>)

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: 64 bytes