Unnamed repository; edit this file 'description' to name the repository.
| -rw-r--r-- | crates/hir-def/src/expr_store/lower.rs | 167 | ||||
| -rw-r--r-- | crates/ide-diagnostics/src/handlers/mutability_errors.rs | 6 |
2 files changed, 74 insertions, 99 deletions
diff --git a/crates/hir-def/src/expr_store/lower.rs b/crates/hir-def/src/expr_store/lower.rs index 26a50b5325..77930c49ce 100644 --- a/crates/hir-def/src/expr_store/lower.rs +++ b/crates/hir-def/src/expr_store/lower.rs @@ -434,7 +434,7 @@ pub struct ExprCollector<'db> { current_try_block_label: Option<LabelId>, label_ribs: Vec<LabelRib>, - current_binding_owner: Option<ExprId>, + unowned_bindings: Vec<BindingId>, awaitable_context: Option<Awaitable>, } @@ -536,7 +536,7 @@ impl<'db> ExprCollector<'db> { current_try_block_label: None, is_lowering_coroutine: false, label_ribs: Vec::new(), - current_binding_owner: None, + unowned_bindings: Vec::new(), awaitable_context: None, current_block_legacy_macro_defs_count: FxHashMap::default(), outer_impl_trait: false, @@ -1062,12 +1062,10 @@ impl<'db> ExprCollector<'db> { Some(ast::BlockModifier::Const(_)) => { self.with_label_rib(RibKind::Constant, |this| { this.with_awaitable_block(Awaitable::No("constant block"), |this| { - let (result_expr_id, prev_binding_owner) = - this.initialize_binding_owner(syntax_ptr); - let inner_expr = this.collect_block(e); - this.store.exprs[result_expr_id] = Expr::Const(inner_expr); - this.current_binding_owner = prev_binding_owner; - result_expr_id + this.with_binding_owner(|this| { + let inner_expr = this.collect_block(e); + this.alloc_expr(Expr::Const(inner_expr), syntax_ptr) + }) }) }) } @@ -1278,64 +1276,65 @@ impl<'db> ExprCollector<'db> { } } ast::Expr::ClosureExpr(e) => self.with_label_rib(RibKind::Closure, |this| { - let (result_expr_id, prev_binding_owner) = - this.initialize_binding_owner(syntax_ptr); - let mut args = Vec::new(); - let mut arg_types = Vec::new(); - if let Some(pl) = e.param_list() { - let num_params = pl.params().count(); - args.reserve_exact(num_params); - arg_types.reserve_exact(num_params); - for param in pl.params() { - let pat = this.collect_pat_top(param.pat()); - let type_ref = - param.ty().map(|it| this.lower_type_ref_disallow_impl_trait(it)); - args.push(pat); - arg_types.push(type_ref); + this.with_binding_owner(|this| { + let mut args = Vec::new(); + let mut arg_types = Vec::new(); + if let Some(pl) = e.param_list() { + let num_params = pl.params().count(); + args.reserve_exact(num_params); + arg_types.reserve_exact(num_params); + for param in pl.params() { + let pat = this.collect_pat_top(param.pat()); + let type_ref = + param.ty().map(|it| this.lower_type_ref_disallow_impl_trait(it)); + args.push(pat); + arg_types.push(type_ref); + } } - } - let ret_type = e - .ret_type() - .and_then(|r| r.ty()) - .map(|it| this.lower_type_ref_disallow_impl_trait(it)); + let ret_type = e + .ret_type() + .and_then(|r| r.ty()) + .map(|it| this.lower_type_ref_disallow_impl_trait(it)); - let prev_is_lowering_coroutine = mem::take(&mut this.is_lowering_coroutine); - let prev_try_block_label = this.current_try_block_label.take(); + let prev_is_lowering_coroutine = mem::take(&mut this.is_lowering_coroutine); + let prev_try_block_label = this.current_try_block_label.take(); - let awaitable = if e.async_token().is_some() { - Awaitable::Yes - } else { - Awaitable::No("non-async closure") - }; - let body = - this.with_awaitable_block(awaitable, |this| this.collect_expr_opt(e.body())); + let awaitable = if e.async_token().is_some() { + Awaitable::Yes + } else { + Awaitable::No("non-async closure") + }; + let body = this + .with_awaitable_block(awaitable, |this| this.collect_expr_opt(e.body())); - let closure_kind = if this.is_lowering_coroutine { - let movability = if e.static_token().is_some() { - Movability::Static + let closure_kind = if this.is_lowering_coroutine { + let movability = if e.static_token().is_some() { + Movability::Static + } else { + Movability::Movable + }; + ClosureKind::Coroutine(movability) + } else if e.async_token().is_some() { + ClosureKind::Async } else { - Movability::Movable + ClosureKind::Closure }; - ClosureKind::Coroutine(movability) - } else if e.async_token().is_some() { - ClosureKind::Async - } else { - ClosureKind::Closure - }; - let capture_by = - if e.move_token().is_some() { CaptureBy::Value } else { CaptureBy::Ref }; - this.is_lowering_coroutine = prev_is_lowering_coroutine; - this.current_binding_owner = prev_binding_owner; - this.current_try_block_label = prev_try_block_label; - this.store.exprs[result_expr_id] = Expr::Closure { - args: args.into(), - arg_types: arg_types.into(), - ret_type, - body, - closure_kind, - capture_by, - }; - result_expr_id + let capture_by = + if e.move_token().is_some() { CaptureBy::Value } else { CaptureBy::Ref }; + this.is_lowering_coroutine = prev_is_lowering_coroutine; + this.current_try_block_label = prev_try_block_label; + this.alloc_expr( + Expr::Closure { + args: args.into(), + arg_types: arg_types.into(), + ret_type, + body, + closure_kind, + capture_by, + }, + syntax_ptr, + ) + }) }), ast::Expr::BinExpr(e) => { let op = e.op_kind(); @@ -1371,11 +1370,7 @@ impl<'db> ExprCollector<'db> { let initializer = self.collect_expr_opt(initializer); let repeat = self.with_label_rib(RibKind::Constant, |this| { if let Some(repeat) = repeat { - let syntax_ptr = AstPtr::new(&repeat); - this.collect_as_a_binding_owner_bad( - |this| this.collect_expr(repeat), - syntax_ptr, - ) + this.with_binding_owner(|this| this.collect_expr(repeat)) } else { this.missing_expr() } @@ -1632,31 +1627,13 @@ impl<'db> ExprCollector<'db> { } } - fn initialize_binding_owner( - &mut self, - syntax_ptr: AstPtr<ast::Expr>, - ) -> (ExprId, Option<ExprId>) { - let result_expr_id = self.alloc_expr(Expr::Missing, syntax_ptr); - let prev_binding_owner = self.current_binding_owner.take(); - self.current_binding_owner = Some(result_expr_id); - - (result_expr_id, prev_binding_owner) - } - - /// FIXME: This function is bad. It will produce a dangling `Missing` expr which wastes memory. Currently - /// it is used only for const blocks and repeat expressions, which are also hacky and ideally should have - /// their own body. Don't add more usage for this function so that we can remove this function after - /// separating those bodies. - fn collect_as_a_binding_owner_bad( - &mut self, - job: impl FnOnce(&mut ExprCollector<'_>) -> ExprId, - syntax_ptr: AstPtr<ast::Expr>, - ) -> ExprId { - let (id, prev_owner) = self.initialize_binding_owner(syntax_ptr); - let tmp = job(self); - self.store.exprs[id] = mem::replace(&mut self.store.exprs[tmp], Expr::Missing); - self.current_binding_owner = prev_owner; - id + fn with_binding_owner(&mut self, create_expr: impl FnOnce(&mut Self) -> ExprId) -> ExprId { + let prev_unowned_bindings_len = self.unowned_bindings.len(); + let expr_id = create_expr(self); + for binding in self.unowned_bindings.drain(prev_unowned_bindings_len..) { + self.store.binding_owners.insert(binding, expr_id); + } + expr_id } /// Desugar `try { <stmts>; <expr> }` into `'<new_label>: { <stmts>; ::std::ops::Try::from_output(<expr>) }`, @@ -2368,11 +2345,7 @@ impl<'db> ExprCollector<'db> { ast::Pat::ConstBlockPat(const_block_pat) => { if let Some(block) = const_block_pat.block_expr() { let expr_id = self.with_label_rib(RibKind::Constant, |this| { - let syntax_ptr = AstPtr::new(&block.clone().into()); - this.collect_as_a_binding_owner_bad( - |this| this.collect_block(block), - syntax_ptr, - ) + this.with_binding_owner(|this| this.collect_block(block)) }); Pat::ConstBlock(expr_id) } else { @@ -3376,9 +3349,7 @@ impl ExprCollector<'_> { hygiene: HygieneId, ) -> BindingId { let binding = self.store.bindings.alloc(Binding { name, mode, problems: None, hygiene }); - if let Some(owner) = self.current_binding_owner { - self.store.binding_owners.insert(binding, owner); - } + self.unowned_bindings.push(binding); binding } diff --git a/crates/ide-diagnostics/src/handlers/mutability_errors.rs b/crates/ide-diagnostics/src/handlers/mutability_errors.rs index 18280a4add..2887a32825 100644 --- a/crates/ide-diagnostics/src/handlers/mutability_errors.rs +++ b/crates/ide-diagnostics/src/handlers/mutability_errors.rs @@ -995,6 +995,10 @@ fn fn_once(mut x: impl FnOnce(u8) -> u8) -> u8 { } "#, ); + // FIXME: There should be no "unused variable" here, and there should be a mutability error, + // but our MIR infra is horribly broken and due to the order in which expressions are lowered + // there is no `StorageLive` for `x` in the closure (in fact, `x` should not even be a variable + // of the closure, the environment should be, but as I said, our MIR infra is horribly broken). check_diagnostics( r#" //- minicore: copy, fn @@ -1003,8 +1007,8 @@ fn f() { || { || { let x = 2; + // ^ 💡 warn: unused variable || { || { x = 5; } } - //^^^^^ 💡 error: cannot mutate immutable variable `x` } } }; |