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supertrait_def_ids was already implemented in middle

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This commit is contained in:
Michael Goulet 2024-06-27 12:29:34 -04:00
parent c9870cfa4b
commit 1160eecba5
2 changed files with 3 additions and 37 deletions
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5
compiler/rustc_middle/src/ty/context.rs
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@ -2466,8 +2466,9 @@ impl<'tcx> TyCtxt<'tcx> {
/// Computes the def-ids of the transitive supertraits of `trait_def_id`. This (intentionally)
/// does not compute the full elaborated super-predicates but just the set of def-ids. It is used
/// to identify which traits may define a given associated type to help avoid cycle errors.
fn supertrait_def_ids(self, trait_def_id: DefId) -> impl Iterator<Item = DefId> + 'tcx {
/// to identify which traits may define a given associated type to help avoid cycle errors,
/// and to make size estimates for vtable layout computation.
pub fn supertrait_def_ids(self, trait_def_id: DefId) -> impl Iterator<Item = DefId> + 'tcx {
let mut set = FxHashSet::default();
let mut stack = vec![trait_def_id];

35
compiler/rustc_middle/src/ty/vtable.rs
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@ -3,8 +3,6 @@ use std::fmt;
use crate::mir::interpret::{alloc_range, AllocId, Allocation, Pointer, Scalar};
use crate::ty::{self, Instance, PolyTraitRef, Ty, TyCtxt};
use rustc_ast::Mutability;
use rustc_data_structures::fx::FxHashSet;
use rustc_hir::def_id::DefId;
use rustc_macros::HashStable;
#[derive(Clone, Copy, PartialEq, HashStable)]
@ -42,45 +40,12 @@ impl<'tcx> fmt::Debug for VtblEntry<'tcx> {
impl<'tcx> TyCtxt<'tcx> {
pub const COMMON_VTABLE_ENTRIES: &'tcx [VtblEntry<'tcx>] =
&[VtblEntry::MetadataDropInPlace, VtblEntry::MetadataSize, VtblEntry::MetadataAlign];
pub fn supertrait_def_ids(self, trait_def_id: DefId) -> SupertraitDefIds<'tcx> {
SupertraitDefIds {
tcx: self,
stack: vec![trait_def_id],
visited: Some(trait_def_id).into_iter().collect(),
}
}
}
pub const COMMON_VTABLE_ENTRIES_DROPINPLACE: usize = 0;
pub const COMMON_VTABLE_ENTRIES_SIZE: usize = 1;
pub const COMMON_VTABLE_ENTRIES_ALIGN: usize = 2;
pub struct SupertraitDefIds<'tcx> {
tcx: TyCtxt<'tcx>,
stack: Vec<DefId>,
visited: FxHashSet<DefId>,
}
impl Iterator for SupertraitDefIds<'_> {
type Item = DefId;
fn next(&mut self) -> Option<DefId> {
let def_id = self.stack.pop()?;
let predicates = self.tcx.explicit_super_predicates_of(def_id);
let visited = &mut self.visited;
self.stack.extend(
predicates
.predicates
.iter()
.filter_map(|(pred, _)| pred.as_trait_clause())
.map(|trait_ref| trait_ref.def_id())
.filter(|&super_def_id| visited.insert(super_def_id)),
);
Some(def_id)
}
}
// Note that we don't have access to a self type here, this has to be purely based on the trait (and
// supertrait) definitions. That means we can't call into the same vtable_entries code since that
// returns a specific instantiation (e.g., with Vacant slots when bounds aren't satisfied). The goal