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Improve code readability by moving the retrieval of closures inside async functions right besides other closures handling.

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Add doc comment explaining what `MutablyUsedVariablesCtxt::prev_move_to_closure` is about.
This commit is contained in:
Guillaume Gomez 2023-09-18 15:47:24 +02:00
parent e3267b1fe7
commit b8b420cc79
1 changed files with 19 additions and 38 deletions
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57
clippy_lints/src/needless_pass_by_ref_mut.rs
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@ -1,13 +1,13 @@
use super::needless_pass_by_value::requires_exact_signature;
use clippy_utils::diagnostics::span_lint_hir_and_then;
use clippy_utils::source::snippet;
use clippy_utils::visitors::for_each_expr_with_closures;
use clippy_utils::{get_parent_node, inherits_cfg, is_from_proc_macro, is_self};
use rustc_data_structures::fx::{FxHashSet, FxIndexMap};
use rustc_errors::Applicability;
use rustc_hir::intravisit::{walk_fn, walk_qpath, FnKind, Visitor};
use rustc_hir::intravisit::{walk_qpath, FnKind, Visitor};
use rustc_hir::{
Body, BodyId, Closure, Expr, ExprKind, FnDecl, HirId, HirIdMap, HirIdSet, Impl, ItemKind, Mutability, Node,
PatKind, QPath,
Body, Closure, Expr, ExprKind, FnDecl, HirId, HirIdMap, HirIdSet, Impl, ItemKind, Mutability, Node, PatKind, QPath,
};
use rustc_hir_typeck::expr_use_visitor as euv;
use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
@ -22,6 +22,8 @@ use rustc_span::symbol::kw;
use rustc_span::Span;
use rustc_target::spec::abi::Abi;
use core::ops::ControlFlow;
declare_clippy_lint! {
/// ### What it does
/// Check if a `&mut` function argument is actually used mutably.
@ -189,17 +191,19 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut<'tcx> {
// We retrieve all the closures declared in the async function because they will
// not be found by `euv::Delegate`.
let mut closures_retriever = ClosuresRetriever {
cx,
closures: FxHashSet::default(),
};
walk_fn(&mut closures_retriever, kind, decl, body.id(), fn_def_id);
check_closures(&mut ctx, cx, &infcx, &mut checked_closures, closures_retriever.closures);
let mut closures: FxHashSet<LocalDefId> = FxHashSet::default();
for_each_expr_with_closures(cx, body, |expr| {
if let ExprKind::Closure(closure) = expr.kind {
closures.insert(closure.def_id);
}
ControlFlow::<()>::Continue(())
});
check_closures(&mut ctx, cx, &infcx, &mut checked_closures, closures);
while !ctx.async_closures.is_empty() {
let closures = ctx.async_closures.clone();
let async_closures = ctx.async_closures.clone();
ctx.async_closures.clear();
check_closures(&mut ctx, cx, &infcx, &mut checked_closures, closures);
check_closures(&mut ctx, cx, &infcx, &mut checked_closures, async_closures);
}
}
ctx
@ -264,6 +268,10 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut<'tcx> {
struct MutablyUsedVariablesCtxt<'tcx> {
mutably_used_vars: HirIdSet,
prev_bind: Option<HirId>,
/// In async functions, the inner AST is composed of multiple layers until we reach the code
/// defined by the user. Because of that, some variables are marked as mutably borrowed even
/// though they're not. This field lists the `HirId` that should not be considered as mutable
/// use of a variable.
prev_move_to_closure: HirIdSet,
aliases: HirIdMap<HirId>,
async_closures: FxHashSet<LocalDefId>,
@ -459,30 +467,3 @@ impl<'tcx> Visitor<'tcx> for FnNeedsMutVisitor<'_, 'tcx> {
}
}
}
struct ClosuresRetriever<'a, 'tcx> {
cx: &'a LateContext<'tcx>,
closures: FxHashSet<LocalDefId>,
}
impl<'a, 'tcx> Visitor<'tcx> for ClosuresRetriever<'a, 'tcx> {
type NestedFilter = OnlyBodies;
fn nested_visit_map(&mut self) -> Self::Map {
self.cx.tcx.hir()
}
fn visit_fn(
&mut self,
kind: FnKind<'tcx>,
decl: &'tcx FnDecl<'tcx>,
body_id: BodyId,
_span: Span,
fn_def_id: LocalDefId,
) {
if matches!(kind, FnKind::Closure) {
self.closures.insert(fn_def_id);
}
walk_fn(self, kind, decl, body_id, fn_def_id);
}
}