28 lines
976 B
Rust
28 lines
976 B
Rust
use rustc_middle::mir::visit::Visitor;
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use rustc_middle::mir::{Constant, ConstantKind, Location};
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use rustc_middle::ty::ConstKind;
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pub struct RequiredConstsVisitor<'a, 'tcx> {
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required_consts: &'a mut Vec<Constant<'tcx>>,
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}
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impl<'a, 'tcx> RequiredConstsVisitor<'a, 'tcx> {
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pub fn new(required_consts: &'a mut Vec<Constant<'tcx>>) -> Self {
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RequiredConstsVisitor { required_consts }
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}
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}
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impl<'tcx> Visitor<'tcx> for RequiredConstsVisitor<'_, 'tcx> {
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fn visit_constant(&mut self, constant: &Constant<'tcx>, _: Location) {
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let literal = constant.literal;
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match literal {
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ConstantKind::Ty(c) => match c.kind() {
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ConstKind::Param(_) | ConstKind::Error(_) => {}
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_ => bug!("only ConstKind::Param should be encountered here, got {:#?}", c),
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},
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ConstantKind::Unevaluated(..) => self.required_consts.push(*constant),
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ConstantKind::Val(..) => {}
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}
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}
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}
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