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Create TraitEnvironment through a query

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This commit is contained in:
Florian Diebold 2021-03-13 20:38:11 +01:00
parent 17eeb2a6d2
commit c82d1823a1
6 changed files with 77 additions and 51 deletions
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90
crates/hir_ty/src/lower.rs
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@ -935,55 +935,55 @@ pub(crate) fn generic_predicates_for_param_recover(
Arc::new([])
}
impl TraitEnvironment {
pub fn lower(db: &dyn HirDatabase, resolver: &Resolver) -> Arc<TraitEnvironment> {
let ctx = TyLoweringContext::new(db, &resolver)
.with_type_param_mode(TypeParamLoweringMode::Placeholder);
let mut traits_in_scope = Vec::new();
let mut clauses = Vec::new();
for pred in resolver.where_predicates_in_scope() {
for pred in GenericPredicate::from_where_predicate(&ctx, pred) {
if pred.is_error() {
continue;
}
if let GenericPredicate::Implemented(tr) = &pred {
traits_in_scope.push((tr.self_ty().clone(), tr.trait_));
}
let program_clause: chalk_ir::ProgramClause<Interner> =
pred.clone().to_chalk(db).cast(&Interner);
clauses.push(program_clause.into_from_env_clause(&Interner));
pub(crate) fn trait_environment_query(
db: &dyn HirDatabase,
def: GenericDefId,
) -> Arc<TraitEnvironment> {
let resolver = def.resolver(db.upcast());
let ctx = TyLoweringContext::new(db, &resolver)
.with_type_param_mode(TypeParamLoweringMode::Placeholder);
let mut traits_in_scope = Vec::new();
let mut clauses = Vec::new();
for pred in resolver.where_predicates_in_scope() {
for pred in GenericPredicate::from_where_predicate(&ctx, pred) {
if pred.is_error() {
continue;
}
}
if let Some(def) = resolver.generic_def() {
let container: Option<AssocContainerId> = match def {
// FIXME: is there a function for this?
GenericDefId::FunctionId(f) => Some(f.lookup(db.upcast()).container),
GenericDefId::AdtId(_) => None,
GenericDefId::TraitId(_) => None,
GenericDefId::TypeAliasId(t) => Some(t.lookup(db.upcast()).container),
GenericDefId::ImplId(_) => None,
GenericDefId::EnumVariantId(_) => None,
GenericDefId::ConstId(c) => Some(c.lookup(db.upcast()).container),
};
if let Some(AssocContainerId::TraitId(trait_id)) = container {
// add `Self: Trait<T1, T2, ...>` to the environment in trait
// function default implementations (and hypothetical code
// inside consts or type aliases)
cov_mark::hit!(trait_self_implements_self);
let substs = Substs::type_params(db, trait_id);
let trait_ref = TraitRef { trait_: trait_id, substs };
let pred = GenericPredicate::Implemented(trait_ref);
let program_clause: chalk_ir::ProgramClause<Interner> =
pred.clone().to_chalk(db).cast(&Interner);
clauses.push(program_clause.into_from_env_clause(&Interner));
if let GenericPredicate::Implemented(tr) = &pred {
traits_in_scope.push((tr.self_ty().clone(), tr.trait_));
}
let program_clause: chalk_ir::ProgramClause<Interner> =
pred.clone().to_chalk(db).cast(&Interner);
clauses.push(program_clause.into_from_env_clause(&Interner));
}
let env = chalk_ir::Environment::new(&Interner).add_clauses(&Interner, clauses);
Arc::new(TraitEnvironment { traits_from_clauses: traits_in_scope, env })
}
let container: Option<AssocContainerId> = match def {
// FIXME: is there a function for this?
GenericDefId::FunctionId(f) => Some(f.lookup(db.upcast()).container),
GenericDefId::AdtId(_) => None,
GenericDefId::TraitId(_) => None,
GenericDefId::TypeAliasId(t) => Some(t.lookup(db.upcast()).container),
GenericDefId::ImplId(_) => None,
GenericDefId::EnumVariantId(_) => None,
GenericDefId::ConstId(c) => Some(c.lookup(db.upcast()).container),
};
if let Some(AssocContainerId::TraitId(trait_id)) = container {
// add `Self: Trait<T1, T2, ...>` to the environment in trait
// function default implementations (and hypothetical code
// inside consts or type aliases)
cov_mark::hit!(trait_self_implements_self);
let substs = Substs::type_params(db, trait_id);
let trait_ref = TraitRef { trait_: trait_id, substs };
let pred = GenericPredicate::Implemented(trait_ref);
let program_clause: chalk_ir::ProgramClause<Interner> =
pred.clone().to_chalk(db).cast(&Interner);
clauses.push(program_clause.into_from_env_clause(&Interner));
}
let env = chalk_ir::Environment::new(&Interner).add_clauses(&Interner, clauses);
Arc::new(TraitEnvironment { traits_from_clauses: traits_in_scope, env })
}
/// Resolve the where clause(s) of an item with generics.