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add new attribute rustc_insignificant_dtor and a query to check if a type has a significant drop

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This commit is contained in:
Dhruv Jauhar 2021-04-13 03:43:11 -04:00
parent 1025db84a6
commit a7e1cec621
11 changed files with 333 additions and 13 deletions
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15
compiler/rustc_middle/src/query/mod.rs
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@ -1035,6 +1035,10 @@ rustc_queries! {
query needs_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
desc { "computing whether `{}` needs drop", env.value }
}
/// Query backing `TyS::has_significant_drop_raw`.
query has_significant_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
desc { "computing whether `{}` has a significant drop", env.value }
}
/// Query backing `TyS::is_structural_eq_shallow`.
///
@ -1055,6 +1059,17 @@ rustc_queries! {
cache_on_disk_if { true }
}
/// A list of types where the ADT requires drop if and only if any of those types
/// has significant drop. A type marked with the attribute `rustc_insignificant_dtor`
/// is considered to not be significant. A drop is significant if it is implemented
/// by the user or does anything that will have any observable behavior (other than
/// freeing up memory). If the ADT is known to have a significant destructor then
/// `Err(AlwaysRequiresDrop)` is returned.
query adt_significant_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
desc { |tcx| "computing when `{}` has a significant destructor", tcx.def_path_str(def_id) }
cache_on_disk_if { false }
}
query layout_raw(
env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>
) -> Result<&'tcx rustc_target::abi::Layout, ty::layout::LayoutError<'tcx>> {