Improve map_entry lint
Fix false positives where the map is used before inserting into the map. Fix false positives where two insertions happen. Suggest using `if let Entry::Vacant(e) = _.entry(_)` when `or_insert` might be a semantic change
This commit is contained in:
Jason Newcomb
parent
b1c675f3fc
commit
ce5e927713
12 changed files with 895 additions and 293 deletions
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@ -1,17 +1,18 @@
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use clippy_utils::diagnostics::span_lint_and_then;
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use clippy_utils::source::{snippet, snippet_opt, snippet_with_applicability};
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use clippy_utils::ty::{is_type_diagnostic_item, match_type};
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use clippy_utils::SpanlessEq;
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use clippy_utils::{get_item_name, paths};
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use if_chain::if_chain;
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use clippy_utils::{
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diagnostics::span_lint_and_sugg,
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is_expr_final_block_expr, is_expr_used_or_unified, match_def_path, paths, peel_hir_expr_while,
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source::{snippet_indent, snippet_with_applicability, snippet_with_context},
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SpanlessEq,
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};
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use rustc_errors::Applicability;
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use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
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use rustc_hir::{BorrowKind, Expr, ExprKind, UnOp};
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use rustc_hir::{
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intravisit::{walk_expr, ErasedMap, NestedVisitorMap, Visitor},
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Expr, ExprKind, Guard, Local, Stmt, StmtKind, UnOp,
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};
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use rustc_lint::{LateContext, LateLintPass};
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use rustc_middle::hir::map::Map;
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use rustc_session::{declare_lint_pass, declare_tool_lint};
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use rustc_span::source_map::Span;
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use rustc_span::sym;
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use rustc_span::{Span, SyntaxContext, DUMMY_SP};
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use std::fmt::Write;
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declare_clippy_lint! {
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/// **What it does:** Checks for uses of `contains_key` + `insert` on `HashMap`
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@ -19,15 +20,14 @@ declare_clippy_lint! {
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///
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/// **Why is this bad?** Using `entry` is more efficient.
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///
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/// **Known problems:** Some false negatives, eg.:
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/// **Known problems:** The suggestion may have type inference errors in some cases. e.g.
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/// ```rust
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/// # use std::collections::HashMap;
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/// # let mut map = HashMap::new();
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/// # let v = 1;
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/// # let k = 1;
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/// if !map.contains_key(&k) {
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/// map.insert(k.clone(), v);
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/// }
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/// let mut map = std::collections::HashMap::new();
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/// let _ = if !map.contains_key(&0) {
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/// map.insert(0, 0)
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/// } else {
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/// None
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/// };
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/// ```
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///
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/// **Example:**
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@ -56,132 +56,379 @@ declare_clippy_lint! {
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declare_lint_pass!(HashMapPass => [MAP_ENTRY]);
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impl<'tcx> LateLintPass<'tcx> for HashMapPass {
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#[allow(clippy::too_many_lines)]
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fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
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if let ExprKind::If(check, then_block, ref else_block) = expr.kind {
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if let ExprKind::Unary(UnOp::Not, check) = check.kind {
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if let Some((ty, map, key)) = check_cond(cx, check) {
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// in case of `if !m.contains_key(&k) { m.insert(k, v); }`
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// we can give a better error message
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let sole_expr = {
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else_block.is_none()
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&& if let ExprKind::Block(then_block, _) = then_block.kind {
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(then_block.expr.is_some() as usize) + then_block.stmts.len() == 1
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} else {
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true
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}
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// XXXManishearth we can also check for if/else blocks containing `None`.
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};
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let (cond_expr, then_expr, else_expr) = match expr.kind {
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ExprKind::If(c, t, e) => (c, t, e),
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_ => return,
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};
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let (map_ty, contains_expr) = match try_parse_contains(cx, cond_expr) {
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Some(x) => x,
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None => return,
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};
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let mut visitor = InsertVisitor {
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cx,
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span: expr.span,
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ty,
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map,
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key,
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sole_expr,
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};
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let then_search = match find_insert_calls(cx, &contains_expr, then_expr) {
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Some(x) => x,
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None => return,
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};
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walk_expr(&mut visitor, then_block);
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}
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} else if let Some(else_block) = *else_block {
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if let Some((ty, map, key)) = check_cond(cx, check) {
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let mut visitor = InsertVisitor {
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cx,
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span: expr.span,
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ty,
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map,
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key,
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sole_expr: false,
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let mut app = Applicability::MachineApplicable;
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let map_str = snippet_with_context(cx, contains_expr.map.span, contains_expr.call_ctxt, "..", &mut app).0;
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let key_str = snippet_with_context(cx, contains_expr.key.span, contains_expr.call_ctxt, "..", &mut app).0;
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let sugg = if !contains_expr.negated || else_expr.is_some() || then_search.insertions.is_empty() {
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return;
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} else {
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// if .. { insert }
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match then_search.as_single_insertion() {
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Some(insertion) if !insertion.value.can_have_side_effects() => {
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format!(
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"{}.entry({}).or_insert({});",
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map_str,
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key_str,
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snippet_with_context(cx, insertion.value.span, insertion.call.span.ctxt(), "..", &mut app).0,
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)
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},
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_ => {
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let (body_str, entry_kind) = if contains_expr.negated {
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(then_search.snippet_vacant(cx, then_expr.span, &mut app), "Vacant(e)")
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} else {
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(
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then_search.snippet_occupied(cx, then_expr.span, &mut app),
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"Occupied(mut e)",
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)
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};
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walk_expr(&mut visitor, else_block);
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}
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format!(
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"if let {}::{} = {}.entry({}) {}",
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map_ty.entry_path(),
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entry_kind,
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map_str,
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key_str,
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body_str,
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)
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},
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}
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};
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span_lint_and_sugg(
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cx,
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MAP_ENTRY,
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expr.span,
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&format!("usage of `contains_key` followed by `insert` on a `{}`", map_ty.name()),
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"try this",
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sugg,
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app,
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);
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}
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}
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#[derive(Clone, Copy)]
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enum MapType {
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Hash,
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BTree,
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}
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impl MapType {
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fn name(self) -> &'static str {
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match self {
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Self::Hash => "HashMap",
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Self::BTree => "BTreeMap",
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}
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}
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fn entry_path(self) -> &'staic str {
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match self {
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Self::Hash => "std::collections::hash_map::Entry",
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Self::BTree => "std::collections::btree_map::Entry",
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}
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}
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}
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fn check_cond<'a>(cx: &LateContext<'_>, check: &'a Expr<'a>) -> Option<(&'static str, &'a Expr<'a>, &'a Expr<'a>)> {
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if_chain! {
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if let ExprKind::MethodCall(path, _, params, _) = check.kind;
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if params.len() >= 2;
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if path.ident.name == sym!(contains_key);
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if let ExprKind::AddrOf(BorrowKind::Ref, _, key) = params[1].kind;
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then {
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let map = ¶ms[0];
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let obj_ty = cx.typeck_results().expr_ty(map).peel_refs();
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return if match_type(cx, obj_ty, &paths::BTREEMAP) {
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Some(("BTreeMap", map, key))
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}
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else if is_type_diagnostic_item(cx, obj_ty, sym::hashmap_type) {
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Some(("HashMap", map, key))
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}
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else {
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None
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struct ContainsExpr<'tcx> {
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negated: bool,
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map: &'tcx Expr<'tcx>,
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key: &'tcx Expr<'tcx>,
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call_ctxt: SyntaxContext,
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}
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fn try_parse_contains(cx: &LateContext<'_>, expr: &'tcx Expr<'_>) -> Option<(MapType, ContainsExpr<'tcx>)> {
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let mut negated = false;
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let expr = peel_hir_expr_while(expr, |e| match e.kind {
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ExprKind::Unary(UnOp::Not, e) => {
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negated = !negated;
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Some(e)
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},
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_ => None,
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});
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match expr.kind {
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ExprKind::MethodCall(
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_,
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_,
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[map, Expr {
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kind: ExprKind::AddrOf(_, _, key),
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span: key_span,
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..
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}],
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_,
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) if key_span.ctxt() == expr.span.ctxt() => {
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let id = cx.typeck_results().type_dependent_def_id(expr.hir_id)?;
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let expr = ContainsExpr {
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negated,
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map,
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key,
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call_ctxt: expr.span.ctxt(),
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};
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}
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}
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None
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}
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struct InsertVisitor<'a, 'tcx, 'b> {
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cx: &'a LateContext<'tcx>,
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span: Span,
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ty: &'static str,
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map: &'b Expr<'b>,
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key: &'b Expr<'b>,
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sole_expr: bool,
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}
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impl<'a, 'tcx, 'b> Visitor<'tcx> for InsertVisitor<'a, 'tcx, 'b> {
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type Map = Map<'tcx>;
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fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
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if_chain! {
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if let ExprKind::MethodCall(path, _, params, _) = expr.kind;
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if params.len() == 3;
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if path.ident.name == sym!(insert);
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if get_item_name(self.cx, self.map) == get_item_name(self.cx, ¶ms[0]);
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if SpanlessEq::new(self.cx).eq_expr(self.key, ¶ms[1]);
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if snippet_opt(self.cx, self.map.span) == snippet_opt(self.cx, params[0].span);
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then {
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span_lint_and_then(self.cx, MAP_ENTRY, self.span,
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&format!("usage of `contains_key` followed by `insert` on a `{}`", self.ty), |diag| {
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if self.sole_expr {
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let mut app = Applicability::MachineApplicable;
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let help = format!("{}.entry({}).or_insert({});",
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snippet_with_applicability(self.cx, self.map.span, "map", &mut app),
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snippet_with_applicability(self.cx, params[1].span, "..", &mut app),
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snippet_with_applicability(self.cx, params[2].span, "..", &mut app));
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diag.span_suggestion(
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self.span,
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"consider using",
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help,
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Applicability::MachineApplicable, // snippet
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);
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}
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else {
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let help = format!("consider using `{}.entry({})`",
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snippet(self.cx, self.map.span, "map"),
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snippet(self.cx, params[1].span, ".."));
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diag.span_label(
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self.span,
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&help,
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);
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}
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});
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if match_def_path(cx, id, &paths::BTREEMAP_CONTAINS_KEY) {
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Some((MapType::BTree, expr))
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} else if match_def_path(cx, id, &paths::HASHMAP_CONTAINS_KEY) {
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Some((MapType::Hash, expr))
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} else {
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None
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}
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}
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if !self.sole_expr {
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walk_expr(self, expr);
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}
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},
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_ => None,
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}
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}
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struct InsertExpr<'tcx> {
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map: &'tcx Expr<'tcx>,
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key: &'tcx Expr<'tcx>,
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value: &'tcx Expr<'tcx>,
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}
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fn try_parse_insert(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<InsertExpr<'tcx>> {
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if let ExprKind::MethodCall(_, _, [map, key, value], _) = expr.kind {
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let id = cx.typeck_results().type_dependent_def_id(expr.hir_id)?;
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if match_def_path(cx, id, &paths::BTREEMAP_INSERT) || match_def_path(cx, id, &paths::HASHMAP_INSERT) {
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Some(InsertExpr { map, key, value })
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} else {
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None
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}
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} else {
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None
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}
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}
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#[derive(Clone, Copy)]
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struct Insertion<'tcx> {
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call: &'tcx Expr<'tcx>,
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value: &'tcx Expr<'tcx>,
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}
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// This visitor needs to do a multiple things:
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// * Find all usages of the map. Only insertions into the map which share the same key are
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// permitted. All others will prevent the lint.
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// * Determine if the final statement executed is an insertion. This is needed to use `insert_with`.
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// * Determine if there's any sub-expression that can't be placed in a closure.
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// * Determine if there's only a single insert statement. This is needed to give better suggestions.
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#[allow(clippy::struct_excessive_bools)]
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struct InsertSearcher<'cx, 'i, 'tcx> {
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cx: &'cx LateContext<'tcx>,
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/// The map expression used in the contains call.
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map: &'tcx Expr<'tcx>,
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/// The key expression used in the contains call.
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key: &'tcx Expr<'tcx>,
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/// The context of the top level block. All insert calls must be in the same context.
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ctxt: SyntaxContext,
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/// Whether this expression can use the entry api.
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can_use_entry: bool,
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// A single insert expression has a slightly different suggestion.
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is_single_insert: bool,
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is_map_used: bool,
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insertions: &'i mut Vec<Insertion<'tcx>>,
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}
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impl<'tcx> InsertSearcher<'_, '_, 'tcx> {
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/// Visit the expression as a branch in control flow. Multiple insert calls can be used, but
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/// only if they are on separate code paths. This will return whether the map was used in the
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/// given expression.
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fn visit_cond_arm(&mut self, e: &'tcx Expr<'_>) -> bool {
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let is_map_used = self.is_map_used;
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self.visit_expr(e);
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let res = self.is_map_used;
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self.is_map_used = is_map_used;
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res
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}
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}
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impl<'tcx> Visitor<'tcx> for InsertSearcher<'_, '_, 'tcx> {
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type Map = ErasedMap<'tcx>;
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fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
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NestedVisitorMap::None
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}
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fn visit_stmt(&mut self, stmt: &'tcx Stmt<'_>) {
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match stmt.kind {
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StmtKind::Semi(e) | StmtKind::Expr(e) => self.visit_expr(e),
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StmtKind::Local(Local { init: Some(e), .. }) => {
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self.is_single_insert = false;
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self.visit_expr(e);
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},
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_ => {
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self.is_single_insert = false;
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},
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}
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}
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fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
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if !self.can_use_entry {
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return;
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}
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match try_parse_insert(self.cx, expr) {
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Some(insert_expr) if SpanlessEq::new(self.cx).eq_expr(self.map, insert_expr.map) => {
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// Multiple inserts, inserts with a different key, and inserts from a macro can't use the entry api.
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if self.is_map_used
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|| !SpanlessEq::new(self.cx).eq_expr(self.key, insert_expr.key)
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|| expr.span.ctxt() != self.ctxt
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{
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self.can_use_entry = false;
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return;
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}
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self.insertions.push(Insertion {
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call: expr,
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value: insert_expr.value,
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});
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self.is_map_used = true;
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// The value doesn't affect whether there is only a single insert expression.
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let is_single_insert = self.is_single_insert;
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self.visit_expr(insert_expr.value);
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self.is_single_insert = is_single_insert;
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},
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_ if SpanlessEq::new(self.cx).eq_expr(self.map, expr) => {
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self.is_map_used = true;
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},
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_ => match expr.kind {
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ExprKind::If(cond_expr, then_expr, Some(else_expr)) => {
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self.is_single_insert = false;
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self.visit_expr(cond_expr);
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// Each branch may contain it's own insert expression.
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let mut is_map_used = self.visit_cond_arm(then_expr);
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is_map_used |= self.visit_cond_arm(else_expr);
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self.is_map_used = is_map_used;
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},
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ExprKind::Match(scrutinee_expr, arms, _) => {
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self.is_single_insert = false;
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self.visit_expr(scrutinee_expr);
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// Each branch may contain it's own insert expression.
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let mut is_map_used = self.is_map_used;
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for arm in arms {
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if let Some(Guard::If(guard) | Guard::IfLet(_, guard)) = arm.guard {
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self.visit_expr(guard)
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}
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is_map_used |= self.visit_cond_arm(arm.body);
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}
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self.is_map_used = is_map_used;
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},
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ExprKind::Loop(block, ..) => {
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// Don't allow insertions inside of a loop.
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let insertions_len = self.insertions.len();
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self.visit_block(block);
|
||||
if self.insertions.len() != insertions_len {
|
||||
self.can_use_entry = false;
|
||||
}
|
||||
},
|
||||
ExprKind::Block(block, _) => self.visit_block(block),
|
||||
ExprKind::InlineAsm(_) | ExprKind::LlvmInlineAsm(_) => {
|
||||
self.can_use_entry = false;
|
||||
},
|
||||
_ => {
|
||||
self.is_single_insert = false;
|
||||
walk_expr(self, expr);
|
||||
},
|
||||
},
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
struct InsertSearchResults<'tcx> {
|
||||
insertions: Vec<Insertion<'tcx>>,
|
||||
is_single_insert: bool,
|
||||
}
|
||||
impl InsertSearchResults<'tcx> {
|
||||
fn as_single_insertion(&self) -> Option<Insertion<'tcx>> {
|
||||
self.is_single_insert.then(|| self.insertions[0])
|
||||
}
|
||||
|
||||
fn snippet_occupied(&self, cx: &LateContext<'_>, mut span: Span, app: &mut Applicability) -> String {
|
||||
let ctxt = span.ctxt();
|
||||
let mut res = String::new();
|
||||
for insertion in self.insertions.iter() {
|
||||
res.push_str(&snippet_with_applicability(
|
||||
cx,
|
||||
span.until(insertion.call.span),
|
||||
"..",
|
||||
app,
|
||||
));
|
||||
if is_expr_used_or_unified(cx.tcx, insertion.call) {
|
||||
res.push_str("Some(e.insert(");
|
||||
res.push_str(&snippet_with_context(cx, insertion.value.span, ctxt, "..", app).0);
|
||||
res.push_str("))");
|
||||
} else {
|
||||
res.push_str("e.insert(");
|
||||
res.push_str(&snippet_with_context(cx, insertion.value.span, ctxt, "..", app).0);
|
||||
res.push(')');
|
||||
}
|
||||
span = span.trim_start(insertion.call.span).unwrap_or(DUMMY_SP);
|
||||
}
|
||||
res.push_str(&snippet_with_applicability(cx, span, "..", app));
|
||||
res
|
||||
}
|
||||
|
||||
fn snippet_vacant(&self, cx: &LateContext<'_>, mut span: Span, app: &mut Applicability) -> String {
|
||||
let ctxt = span.ctxt();
|
||||
let mut res = String::new();
|
||||
for insertion in self.insertions.iter() {
|
||||
res.push_str(&snippet_with_applicability(
|
||||
cx,
|
||||
span.until(insertion.call.span),
|
||||
"..",
|
||||
app,
|
||||
));
|
||||
if is_expr_used_or_unified(cx.tcx, insertion.call) {
|
||||
if is_expr_final_block_expr(cx.tcx, insertion.call) {
|
||||
let _ = write!(
|
||||
res,
|
||||
"e.insert({});\n{}None",
|
||||
snippet_with_context(cx, insertion.value.span, ctxt, "..", app).0,
|
||||
snippet_indent(cx, insertion.call.span).as_deref().unwrap_or(""),
|
||||
);
|
||||
} else {
|
||||
let _ = write!(
|
||||
res,
|
||||
"{{ e.insert({}); None }}",
|
||||
snippet_with_context(cx, insertion.value.span, ctxt, "..", app).0,
|
||||
);
|
||||
}
|
||||
} else {
|
||||
let _ = write!(
|
||||
res,
|
||||
"e.insert({})",
|
||||
snippet_with_context(cx, insertion.value.span, ctxt, "..", app).0,
|
||||
);
|
||||
}
|
||||
span = span.trim_start(insertion.call.span).unwrap_or(DUMMY_SP);
|
||||
}
|
||||
res.push_str(&snippet_with_applicability(cx, span, "..", app));
|
||||
res
|
||||
}
|
||||
}
|
||||
fn find_insert_calls(
|
||||
cx: &LateContext<'tcx>,
|
||||
contains_expr: &ContainsExpr<'tcx>,
|
||||
expr: &'tcx Expr<'_>,
|
||||
) -> Option<InsertSearchResults<'tcx>> {
|
||||
let mut insertions = Vec::new();
|
||||
let mut s = InsertSearcher {
|
||||
cx,
|
||||
map: contains_expr.map,
|
||||
key: contains_expr.key,
|
||||
ctxt: expr.span.ctxt(),
|
||||
insertions: &mut insertions,
|
||||
is_map_used: false,
|
||||
can_use_entry: true,
|
||||
is_single_insert: true,
|
||||
};
|
||||
s.visit_expr(expr);
|
||||
let is_single_insert = s.is_single_insert;
|
||||
s.can_use_entry.then(|| InsertSearchResults {
|
||||
insertions,
|
||||
is_single_insert,
|
||||
})
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue