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use rustc_middle::mir::visit::{
MutatingUseContext, NonMutatingUseContext, NonUseContext, PlaceContext,
};
#[derive(Eq, PartialEq, Clone)]
pub enum DefUse {
Def,
Use,
Drop,
}
pub fn categorize(context: PlaceContext) -> Option<DefUse> {
match context {
PlaceContext::MutatingUse(MutatingUseContext::Store) |
PlaceContext::MutatingUse(MutatingUseContext::Call) |
PlaceContext::MutatingUse(MutatingUseContext::AsmOutput) |
PlaceContext::MutatingUse(MutatingUseContext::Yield) |
PlaceContext::NonUse(NonUseContext::StorageLive) |
PlaceContext::NonUse(NonUseContext::StorageDead) => Some(DefUse::Def),
PlaceContext::NonMutatingUse(NonMutatingUseContext::Projection) |
PlaceContext::MutatingUse(MutatingUseContext::Projection) |
PlaceContext::MutatingUse(MutatingUseContext::Borrow) |
PlaceContext::NonMutatingUse(NonMutatingUseContext::SharedBorrow) |
PlaceContext::NonMutatingUse(NonMutatingUseContext::ShallowBorrow) |
PlaceContext::NonMutatingUse(NonMutatingUseContext::UniqueBorrow) |
PlaceContext::MutatingUse(MutatingUseContext::AddressOf) |
PlaceContext::NonMutatingUse(NonMutatingUseContext::AddressOf) |
PlaceContext::NonMutatingUse(NonMutatingUseContext::Inspect) |
PlaceContext::NonMutatingUse(NonMutatingUseContext::Copy) |
PlaceContext::NonMutatingUse(NonMutatingUseContext::Move) |
PlaceContext::NonUse(NonUseContext::AscribeUserTy) |
PlaceContext::MutatingUse(MutatingUseContext::Retag) =>
Some(DefUse::Use),
PlaceContext::MutatingUse(MutatingUseContext::Drop) =>
Some(DefUse::Drop),
PlaceContext::NonUse(NonUseContext::VarDebugInfo) => None,
PlaceContext::MutatingUse(MutatingUseContext::Deinit | MutatingUseContext::SetDiscriminant) => {
bug!("These statements are not allowed in this MIR phase")
}
}
}