charon_lib/transform/
lift_associated_item_clauses.rs1use std::collections::HashMap;
5use std::mem;
6
7use crate::{ast::*, ids::Vector};
8
9use super::{ctx::TransformPass, TransformCtx};
10
11pub struct Transform;
12impl TransformPass for Transform {
13 fn transform_ctx(&self, ctx: &mut TransformCtx) {
14 let trait_item_clause_ids: Vector<
17 TraitDeclId,
18 HashMap<TraitItemName, Vector<TraitClauseId, TraitClauseId>>,
19 > = ctx.translated.trait_decls.map_ref_mut(|decl| {
20 mem::take(&mut decl.type_clauses)
21 .into_iter()
22 .map(|(name, clauses)| {
23 let id_map = clauses.map(|mut clause| {
24 decl.parent_clauses.push_with(|id| {
25 clause.clause_id = id;
26 clause
27 })
28 });
29 (name, id_map)
30 })
31 .collect()
32 });
33
34 for timpl in ctx.translated.trait_impls.iter_mut() {
36 for (_, refs) in mem::take(&mut timpl.type_clauses) {
37 for trait_ref in refs {
38 timpl.parent_trait_refs.push(trait_ref);
41 }
42 }
43 }
44
45 ctx.translated.dyn_visit_mut(|trkind: &mut TraitRefKind| {
47 use TraitRefKind::*;
48 if let ItemClause(..) = trkind {
49 take_mut::take(trkind, |trkind| {
50 let ItemClause(trait_ref, trait_decl, item_name, item_clause_id) = trkind
51 else {
52 unreachable!()
53 };
54 let new_id = (|| {
55 let new_id = *trait_item_clause_ids
56 .get(trait_decl)?
57 .get(&item_name)?
58 .get(item_clause_id)?;
59 Some(new_id)
60 })();
61 match new_id {
62 Some(new_id) => ParentClause(trait_ref, trait_decl, new_id),
63 None => ItemClause(trait_ref, trait_decl, item_name, item_clause_id),
64 }
65 })
66 }
67 });
68 }
69}