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Diffstat (limited to 'crates/hir-def/src/expr_store/lower.rs')
| -rw-r--r-- | crates/hir-def/src/expr_store/lower.rs | 42 |
1 files changed, 39 insertions, 3 deletions
diff --git a/crates/hir-def/src/expr_store/lower.rs b/crates/hir-def/src/expr_store/lower.rs index 701586c258..1cecd1976b 100644 --- a/crates/hir-def/src/expr_store/lower.rs +++ b/crates/hir-def/src/expr_store/lower.rs @@ -32,8 +32,8 @@ use triomphe::Arc; use tt::TextRange; use crate::{ - AdtId, BlockId, BlockLoc, DefWithBodyId, FunctionId, GenericDefId, ImplId, MacroId, - ModuleDefId, ModuleId, TraitId, TypeAliasId, UnresolvedMacro, + AdtId, BlockId, BlockLoc, DefWithBodyId, FunctionId, GenericDefId, ImplId, ItemContainerId, + MacroId, ModuleDefId, ModuleId, TraitId, TypeAliasId, UnresolvedMacro, attrs::AttrFlags, db::DefDatabase, expr_store::{ @@ -141,9 +141,19 @@ pub(super) fn lower_body( source_map_self_param = Some(collector.expander.in_file(AstPtr::new(&self_param_syn))); } + let is_extern = matches!( + owner, + DefWithBodyId::FunctionId(id) + if matches!(id.loc(db).container, ItemContainerId::ExternBlockId(_)), + ); + for param in param_list.params() { if collector.check_cfg(¶m) { - let param_pat = collector.collect_pat_top(param.pat()); + let param_pat = if is_extern { + collector.collect_extern_fn_param(param.pat()) + } else { + collector.collect_pat_top(param.pat()) + }; params.push(param_pat); } } @@ -2248,6 +2258,32 @@ impl<'db> ExprCollector<'db> { } } + fn collect_extern_fn_param(&mut self, pat: Option<ast::Pat>) -> PatId { + // `extern` functions cannot have pattern-matched parameters, and furthermore, the identifiers + // in their parameters are always interpreted as bindings, even if in a normal function they + // won't be, because they would refer to a path pattern. + let Some(pat) = pat else { return self.missing_pat() }; + + match &pat { + ast::Pat::IdentPat(bp) => { + // FIXME: Emit an error if `!bp.is_simple_ident()`. + + let name = bp.name().map(|nr| nr.as_name()).unwrap_or_else(Name::missing); + let hygiene = bp + .name() + .map(|name| self.hygiene_id_for(name.syntax().text_range())) + .unwrap_or(HygieneId::ROOT); + let binding = self.alloc_binding(name, BindingAnnotation::Unannotated, hygiene); + let pat = + self.alloc_pat(Pat::Bind { id: binding, subpat: None }, AstPtr::new(&pat)); + self.add_definition_to_binding(binding, pat); + pat + } + // FIXME: Emit an error. + _ => self.missing_pat(), + } + } + // region: patterns fn collect_pat_top(&mut self, pat: Option<ast::Pat>) -> PatId { |