2021-03-25 13:29:11 -05:00
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|
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use clippy_utils::diagnostics::{multispan_sugg, span_lint_and_then};
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use clippy_utils::ptr::get_spans;
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use clippy_utils::source::{snippet, snippet_opt};
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use clippy_utils::ty::{implements_trait, is_copy, is_type_diagnostic_item};
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use clippy_utils::{get_trait_def_id, is_self, paths};
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2018-11-27 14:14:15 -06:00
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use if_chain::if_chain;
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2020-02-29 21:23:33 -06:00
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use rustc_ast::ast::Attribute;
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2021-04-08 10:50:13 -05:00
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use rustc_data_structures::fx::FxHashSet;
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2020-01-10 18:06:09 -06:00
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use rustc_errors::{Applicability, DiagnosticBuilder};
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2020-01-09 01:13:22 -06:00
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use rustc_hir::intravisit::FnKind;
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2021-01-15 03:56:44 -06:00
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use rustc_hir::{BindingAnnotation, Body, FnDecl, GenericArg, HirId, Impl, ItemKind, Node, PatKind, QPath, TyKind};
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2021-04-08 10:50:13 -05:00
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use rustc_hir::{HirIdMap, HirIdSet};
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2020-02-16 20:07:26 -06:00
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use rustc_infer::infer::TyCtxtInferExt;
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2020-01-12 00:08:41 -06:00
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use rustc_lint::{LateContext, LateLintPass};
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2021-02-25 14:33:18 -06:00
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use rustc_middle::mir::FakeReadCause;
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2020-03-30 04:02:14 -05:00
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use rustc_middle::ty::{self, TypeFoldable};
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2020-01-11 05:37:08 -06:00
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use rustc_session::{declare_lint_pass, declare_tool_lint};
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2021-01-15 03:56:44 -06:00
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use rustc_span::symbol::kw;
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2020-11-05 07:29:48 -06:00
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use rustc_span::{sym, Span};
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2018-12-29 09:04:45 -06:00
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use rustc_target::spec::abi::Abi;
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2020-03-14 15:26:32 -05:00
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use rustc_trait_selection::traits;
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use rustc_trait_selection::traits::misc::can_type_implement_copy;
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2019-11-29 04:12:19 -06:00
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use rustc_typeck::expr_use_visitor as euv;
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2017-10-08 03:51:44 -05:00
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use std::borrow::Cow;
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2017-02-18 02:00:36 -06:00
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2018-03-28 08:24:26 -05:00
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declare_clippy_lint! {
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2021-07-29 05:16:06 -05:00
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/// ### What it does
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/// Checks for functions taking arguments by value, but not
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2019-03-05 10:50:33 -06:00
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/// consuming them in its
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/// body.
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///
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2021-07-29 05:16:06 -05:00
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/// ### Why is this bad?
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/// Taking arguments by reference is more flexible and can
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2019-03-05 10:50:33 -06:00
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/// sometimes avoid
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/// unnecessary allocations.
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///
|
2021-07-29 05:16:06 -05:00
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/// ### Known problems
|
2019-03-05 10:50:33 -06:00
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/// * This lint suggests taking an argument by reference,
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/// however sometimes it is better to let users decide the argument type
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/// (by using `Borrow` trait, for example), depending on how the function is used.
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///
|
2021-07-29 05:16:06 -05:00
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/// ### Example
|
2019-03-05 10:50:33 -06:00
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/// ```rust
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/// fn foo(v: Vec<i32>) {
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/// assert_eq!(v.len(), 42);
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/// }
|
2019-08-03 11:42:05 -05:00
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/// ```
|
2020-08-11 08:43:21 -05:00
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/// should be
|
2019-08-03 11:42:05 -05:00
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/// ```rust
|
2019-03-05 10:50:33 -06:00
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/// fn foo(v: &[i32]) {
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/// assert_eq!(v.len(), 42);
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/// }
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/// ```
|
2017-02-19 21:50:31 -06:00
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pub NEEDLESS_PASS_BY_VALUE,
|
2018-11-21 03:58:27 -06:00
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pedantic,
|
2017-02-19 21:50:31 -06:00
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"functions taking arguments by value, but not consuming them in its body"
|
2017-02-18 02:00:36 -06:00
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}
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2019-04-08 15:43:55 -05:00
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declare_lint_pass!(NeedlessPassByValue => [NEEDLESS_PASS_BY_VALUE]);
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2017-02-18 02:00:36 -06:00
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2017-03-16 02:57:17 -05:00
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macro_rules! need {
|
2018-11-27 14:14:15 -06:00
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($e: expr) => {
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if let Some(x) = $e {
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x
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} else {
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return;
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}
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};
|
2017-03-16 02:57:17 -05:00
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}
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|
2020-06-25 15:41:36 -05:00
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impl<'tcx> LateLintPass<'tcx> for NeedlessPassByValue {
|
2019-01-13 09:19:02 -06:00
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#[allow(clippy::too_many_lines)]
|
2017-02-18 02:00:36 -06:00
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fn check_fn(
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&mut self,
|
2020-06-25 15:41:36 -05:00
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cx: &LateContext<'tcx>,
|
2017-02-18 02:00:36 -06:00
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kind: FnKind<'tcx>,
|
2019-12-29 22:02:10 -06:00
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decl: &'tcx FnDecl<'_>,
|
2019-12-22 08:42:41 -06:00
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body: &'tcx Body<'_>,
|
2017-02-18 02:00:36 -06:00
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span: Span,
|
2019-02-20 04:11:11 -06:00
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hir_id: HirId,
|
2017-02-18 02:00:36 -06:00
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) {
|
2019-08-19 11:30:32 -05:00
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|
if span.from_expansion() {
|
2017-02-18 02:00:36 -06:00
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return;
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}
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|
2017-03-12 17:30:18 -05:00
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match kind {
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2020-11-27 02:24:42 -06:00
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FnKind::ItemFn(.., header, _) => {
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let attrs = cx.tcx.hir().attrs(hir_id);
|
2019-03-11 06:45:57 -05:00
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|
if header.abi != Abi::Rust || requires_exact_signature(attrs) {
|
2018-01-18 02:30:52 -06:00
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return;
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}
|
2017-03-12 17:30:18 -05:00
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},
|
2017-11-03 03:24:10 -05:00
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FnKind::Method(..) => (),
|
2020-11-27 02:24:42 -06:00
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FnKind::Closure => return,
|
2017-02-18 02:00:36 -06:00
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}
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|
2017-11-03 03:24:10 -05:00
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// Exclude non-inherent impls
|
2019-06-25 16:41:10 -05:00
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|
if let Some(Node::Item(item)) = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(hir_id)) {
|
2020-12-20 10:19:49 -06:00
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|
if matches!(
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|
item.kind,
|
2020-11-22 16:46:21 -06:00
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|
ItemKind::Impl(Impl { of_trait: Some(_), .. }) | ItemKind::Trait(..)
|
2020-12-20 10:19:49 -06:00
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|
) {
|
2017-11-03 03:24:10 -05:00
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|
|
return;
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|
|
|
}
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|
}
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|
2017-10-08 04:04:45 -05:00
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|
// Allow `Borrow` or functions to be taken by value
|
2020-07-07 10:12:44 -05:00
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|
let allowed_traits = [
|
2017-10-08 04:04:45 -05:00
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|
need!(cx.tcx.lang_items().fn_trait()),
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need!(cx.tcx.lang_items().fn_once_trait()),
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|
need!(cx.tcx.lang_items().fn_mut_trait()),
|
2019-05-17 16:53:54 -05:00
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|
need!(get_trait_def_id(cx, &paths::RANGE_ARGUMENT_TRAIT)),
|
2017-10-08 04:04:45 -05:00
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|
];
|
2017-10-07 20:23:41 -05:00
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|
let sized_trait = need!(cx.tcx.lang_items().sized_trait());
|
2017-02-18 02:00:36 -06:00
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|
2019-07-05 22:52:51 -05:00
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|
let fn_def_id = cx.tcx.hir().local_def_id(hir_id);
|
2017-05-14 02:56:10 -05:00
|
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|
2020-07-02 19:52:40 -05:00
|
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|
let preds = traits::elaborate_predicates(cx.tcx, cx.param_env.caller_bounds().iter())
|
2017-10-07 20:23:41 -05:00
|
|
|
.filter(|p| !p.is_global())
|
2020-04-10 18:41:52 -05:00
|
|
|
.filter_map(|obligation| {
|
2020-06-19 03:22:25 -05:00
|
|
|
// Note that we do not want to deal with qualified predicates here.
|
2021-01-07 10:20:28 -06:00
|
|
|
match obligation.predicate.kind().no_bound_vars() {
|
2021-07-22 08:56:07 -05:00
|
|
|
Some(ty::PredicateKind::Trait(pred)) if pred.def_id() != sized_trait => Some(pred),
|
2020-12-21 21:49:03 -06:00
|
|
|
_ => None,
|
2017-10-08 06:17:04 -05:00
|
|
|
}
|
2017-10-07 20:23:41 -05:00
|
|
|
})
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|
.collect::<Vec<_>>();
|
2017-02-19 21:50:31 -06:00
|
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|
|
2017-08-09 02:30:56 -05:00
|
|
|
// Collect moved variables and spans which will need dereferencings from the
|
|
|
|
// function body.
|
|
|
|
let MovedVariablesCtxt {
|
|
|
|
moved_vars,
|
|
|
|
spans_need_deref,
|
|
|
|
..
|
|
|
|
} = {
|
2019-10-04 08:00:01 -05:00
|
|
|
let mut ctx = MovedVariablesCtxt::default();
|
2019-11-29 04:12:19 -06:00
|
|
|
cx.tcx.infer_ctxt().enter(|infcx| {
|
2020-07-17 03:47:04 -05:00
|
|
|
euv::ExprUseVisitor::new(&mut ctx, &infcx, fn_def_id, cx.param_env, cx.typeck_results())
|
|
|
|
.consume_body(body);
|
2019-11-29 04:12:19 -06:00
|
|
|
});
|
2017-02-20 01:45:37 -06:00
|
|
|
ctx
|
2017-02-18 02:00:36 -06:00
|
|
|
};
|
|
|
|
|
2017-06-29 08:38:25 -05:00
|
|
|
let fn_sig = cx.tcx.fn_sig(fn_def_id);
|
2020-10-23 19:21:27 -05:00
|
|
|
let fn_sig = cx.tcx.erase_late_bound_regions(fn_sig);
|
2017-02-18 02:00:36 -06:00
|
|
|
|
2019-12-22 08:56:34 -06:00
|
|
|
for (idx, ((input, &ty), arg)) in decl.inputs.iter().zip(fn_sig.inputs()).zip(body.params).enumerate() {
|
2017-10-17 17:29:47 -05:00
|
|
|
// All spans generated from a proc-macro invocation are the same...
|
|
|
|
if span == input.span {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2017-11-03 03:24:10 -05:00
|
|
|
// Ignore `self`s.
|
|
|
|
if idx == 0 {
|
2019-09-27 10:16:06 -05:00
|
|
|
if let PatKind::Binding(.., ident, _) = arg.pat.kind {
|
2021-01-15 03:56:44 -06:00
|
|
|
if ident.name == kw::SelfLower {
|
2017-11-03 03:24:10 -05:00
|
|
|
continue;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-08-11 08:43:21 -05:00
|
|
|
//
|
2017-10-07 20:23:41 -05:00
|
|
|
// * Exclude a type that is specifically bounded by `Borrow`.
|
2019-01-30 19:15:29 -06:00
|
|
|
// * Exclude a type whose reference also fulfills its bound. (e.g., `std::convert::AsRef`,
|
2018-11-27 14:14:15 -06:00
|
|
|
// `serde::Serialize`)
|
2017-10-07 20:23:41 -05:00
|
|
|
let (implements_borrow_trait, all_borrowable_trait) = {
|
2020-08-11 08:43:21 -05:00
|
|
|
let preds = preds.iter().filter(|t| t.self_ty() == ty).collect::<Vec<_>>();
|
2017-10-07 20:23:41 -05:00
|
|
|
|
|
|
|
(
|
2021-07-29 05:16:06 -05:00
|
|
|
preds.iter().any(|t| cx.tcx.is_diagnostic_item(sym::Borrow, t.def_id())),
|
2020-02-09 02:31:47 -06:00
|
|
|
!preds.is_empty() && {
|
2020-02-15 10:24:49 -06:00
|
|
|
let ty_empty_region = cx.tcx.mk_imm_ref(cx.tcx.lifetimes.re_root_empty, ty);
|
2020-02-09 02:31:47 -06:00
|
|
|
preds.iter().all(|t| {
|
2020-08-11 08:43:21 -05:00
|
|
|
let ty_params = t.trait_ref.substs.iter().skip(1).collect::<Vec<_>>();
|
2020-06-19 03:22:25 -05:00
|
|
|
implements_trait(cx, ty_empty_region, t.def_id(), &ty_params)
|
2020-02-09 02:31:47 -06:00
|
|
|
})
|
|
|
|
},
|
2017-10-07 20:23:41 -05:00
|
|
|
)
|
|
|
|
};
|
2017-02-19 21:50:31 -06:00
|
|
|
|
2017-10-23 14:18:02 -05:00
|
|
|
if_chain! {
|
|
|
|
if !is_self(arg);
|
2019-07-26 15:58:31 -05:00
|
|
|
if !ty.is_mutable_ptr();
|
2017-10-23 14:18:02 -05:00
|
|
|
if !is_copy(cx, ty);
|
2020-07-07 10:12:44 -05:00
|
|
|
if !allowed_traits.iter().any(|&t| implements_trait(cx, ty, t, &[]));
|
2017-10-23 14:18:02 -05:00
|
|
|
if !implements_borrow_trait;
|
|
|
|
if !all_borrowable_trait;
|
|
|
|
|
2019-09-27 10:16:06 -05:00
|
|
|
if let PatKind::Binding(mode, canonical_id, ..) = arg.pat.kind;
|
2017-10-23 14:18:02 -05:00
|
|
|
if !moved_vars.contains(&canonical_id);
|
|
|
|
then {
|
|
|
|
if mode == BindingAnnotation::Mutable || mode == BindingAnnotation::RefMut {
|
|
|
|
continue;
|
|
|
|
}
|
2017-11-03 03:24:10 -05:00
|
|
|
|
2017-10-23 14:18:02 -05:00
|
|
|
// Dereference suggestion
|
2020-04-17 01:08:00 -05:00
|
|
|
let sugg = |diag: &mut DiagnosticBuilder<'_>| {
|
2020-08-03 17:18:29 -05:00
|
|
|
if let ty::Adt(def, ..) = ty.kind() {
|
2018-12-07 18:56:03 -06:00
|
|
|
if let Some(span) = cx.tcx.hir().span_if_local(def.did) {
|
2020-01-08 00:42:54 -06:00
|
|
|
if can_type_implement_copy(cx.tcx, cx.param_env, ty).is_ok() {
|
2020-04-17 01:08:00 -05:00
|
|
|
diag.span_help(span, "consider marking this type as `Copy`");
|
2018-01-18 07:27:47 -06:00
|
|
|
}
|
2018-01-18 02:45:41 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2017-10-23 14:18:02 -05:00
|
|
|
let deref_span = spans_need_deref.get(&canonical_id);
|
|
|
|
if_chain! {
|
2020-11-05 07:29:48 -06:00
|
|
|
if is_type_diagnostic_item(cx, ty, sym::vec_type);
|
2017-10-23 14:18:02 -05:00
|
|
|
if let Some(clone_spans) =
|
2019-05-17 16:53:54 -05:00
|
|
|
get_spans(cx, Some(body.id()), idx, &[("clone", ".to_owned()")]);
|
2021-04-08 10:50:13 -05:00
|
|
|
if let TyKind::Path(QPath::Resolved(_, path)) = input.kind;
|
2017-10-23 14:18:02 -05:00
|
|
|
if let Some(elem_ty) = path.segments.iter()
|
2020-11-05 07:29:48 -06:00
|
|
|
.find(|seg| seg.ident.name == sym::Vec)
|
2018-06-24 08:32:40 -05:00
|
|
|
.and_then(|ps| ps.args.as_ref())
|
2018-06-24 16:42:52 -05:00
|
|
|
.map(|params| params.args.iter().find_map(|arg| match arg {
|
|
|
|
GenericArg::Type(ty) => Some(ty),
|
2019-02-19 01:34:43 -06:00
|
|
|
_ => None,
|
2018-06-24 16:42:52 -05:00
|
|
|
}).unwrap());
|
2017-10-23 14:18:02 -05:00
|
|
|
then {
|
|
|
|
let slice_ty = format!("&[{}]", snippet(cx, elem_ty.span, "_"));
|
2020-04-17 01:08:00 -05:00
|
|
|
diag.span_suggestion(
|
2018-09-18 10:07:54 -05:00
|
|
|
input.span,
|
|
|
|
"consider changing the type to",
|
|
|
|
slice_ty,
|
|
|
|
Applicability::Unspecified,
|
|
|
|
);
|
2017-11-03 03:24:10 -05:00
|
|
|
|
2017-10-23 14:18:02 -05:00
|
|
|
for (span, suggestion) in clone_spans {
|
2020-04-17 01:08:00 -05:00
|
|
|
diag.span_suggestion(
|
2017-10-23 14:18:02 -05:00
|
|
|
span,
|
|
|
|
&snippet_opt(cx, span)
|
|
|
|
.map_or(
|
|
|
|
"change the call to".into(),
|
|
|
|
|x| Cow::from(format!("change `{}` to", x)),
|
|
|
|
),
|
2018-09-15 11:14:08 -05:00
|
|
|
suggestion.into(),
|
|
|
|
Applicability::Unspecified,
|
2017-10-23 14:18:02 -05:00
|
|
|
);
|
|
|
|
}
|
2017-11-03 03:24:10 -05:00
|
|
|
|
2017-10-23 14:18:02 -05:00
|
|
|
// cannot be destructured, no need for `*` suggestion
|
|
|
|
assert!(deref_span.is_none());
|
|
|
|
return;
|
|
|
|
}
|
2017-10-08 03:51:44 -05:00
|
|
|
}
|
2017-11-03 03:24:10 -05:00
|
|
|
|
2020-11-05 07:29:48 -06:00
|
|
|
if is_type_diagnostic_item(cx, ty, sym::string_type) {
|
2017-10-23 14:18:02 -05:00
|
|
|
if let Some(clone_spans) =
|
2019-05-17 16:53:54 -05:00
|
|
|
get_spans(cx, Some(body.id()), idx, &[("clone", ".to_string()"), ("as_str", "")]) {
|
2020-04-17 01:08:00 -05:00
|
|
|
diag.span_suggestion(
|
2018-09-18 10:07:54 -05:00
|
|
|
input.span,
|
|
|
|
"consider changing the type to",
|
|
|
|
"&str".to_string(),
|
|
|
|
Applicability::Unspecified,
|
|
|
|
);
|
2017-11-03 03:24:10 -05:00
|
|
|
|
2017-10-23 14:18:02 -05:00
|
|
|
for (span, suggestion) in clone_spans {
|
2020-04-17 01:08:00 -05:00
|
|
|
diag.span_suggestion(
|
2017-10-23 14:18:02 -05:00
|
|
|
span,
|
|
|
|
&snippet_opt(cx, span)
|
|
|
|
.map_or(
|
|
|
|
"change the call to".into(),
|
|
|
|
|x| Cow::from(format!("change `{}` to", x))
|
|
|
|
),
|
|
|
|
suggestion.into(),
|
2018-09-15 11:14:08 -05:00
|
|
|
Applicability::Unspecified,
|
2017-10-23 14:18:02 -05:00
|
|
|
);
|
|
|
|
}
|
2017-11-03 03:24:10 -05:00
|
|
|
|
2017-10-23 14:18:02 -05:00
|
|
|
assert!(deref_span.is_none());
|
|
|
|
return;
|
2017-10-08 03:51:44 -05:00
|
|
|
}
|
|
|
|
}
|
2017-11-03 03:24:10 -05:00
|
|
|
|
2017-10-23 14:18:02 -05:00
|
|
|
let mut spans = vec![(input.span, format!("&{}", snippet(cx, input.span, "_")))];
|
2017-11-03 03:24:10 -05:00
|
|
|
|
2017-10-23 14:18:02 -05:00
|
|
|
// Suggests adding `*` to dereference the added reference.
|
|
|
|
if let Some(deref_span) = deref_span {
|
|
|
|
spans.extend(
|
|
|
|
deref_span
|
|
|
|
.iter()
|
2021-04-22 04:31:13 -05:00
|
|
|
.copied()
|
2017-10-23 14:18:02 -05:00
|
|
|
.map(|span| (span, format!("*{}", snippet(cx, span, "<expr>")))),
|
|
|
|
);
|
|
|
|
spans.sort_by_key(|&(span, _)| span);
|
|
|
|
}
|
2020-05-17 10:36:26 -05:00
|
|
|
multispan_sugg(diag, "consider taking a reference instead", spans);
|
2017-10-23 14:18:02 -05:00
|
|
|
};
|
2017-11-03 03:24:10 -05:00
|
|
|
|
2017-10-23 14:18:02 -05:00
|
|
|
span_lint_and_then(
|
|
|
|
cx,
|
|
|
|
NEEDLESS_PASS_BY_VALUE,
|
|
|
|
input.span,
|
|
|
|
"this argument is passed by value, but not consumed in the function body",
|
|
|
|
sugg,
|
|
|
|
);
|
|
|
|
}
|
|
|
|
}
|
2017-02-18 02:00:36 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-03-11 06:45:57 -05:00
|
|
|
/// Functions marked with these attributes must have the exact signature.
|
|
|
|
fn requires_exact_signature(attrs: &[Attribute]) -> bool {
|
|
|
|
attrs.iter().any(|attr| {
|
2020-11-05 07:29:48 -06:00
|
|
|
[sym::proc_macro, sym::proc_macro_attribute, sym::proc_macro_derive]
|
2019-03-11 06:45:57 -05:00
|
|
|
.iter()
|
2020-08-02 05:17:20 -05:00
|
|
|
.any(|&allow| attr.has_name(allow))
|
2019-03-11 06:45:57 -05:00
|
|
|
})
|
|
|
|
}
|
|
|
|
|
2019-10-04 08:00:01 -05:00
|
|
|
#[derive(Default)]
|
|
|
|
struct MovedVariablesCtxt {
|
2021-04-08 10:50:13 -05:00
|
|
|
moved_vars: HirIdSet,
|
2017-08-09 02:30:56 -05:00
|
|
|
/// Spans which need to be prefixed with `*` for dereferencing the
|
2017-10-07 20:23:41 -05:00
|
|
|
/// suggested additional reference.
|
2021-04-08 10:50:13 -05:00
|
|
|
spans_need_deref: HirIdMap<FxHashSet<Span>>,
|
2017-02-18 02:00:36 -06:00
|
|
|
}
|
|
|
|
|
2019-10-04 08:00:01 -05:00
|
|
|
impl MovedVariablesCtxt {
|
2020-06-17 17:13:05 -05:00
|
|
|
fn move_common(&mut self, cmt: &euv::PlaceWithHirId<'_>) {
|
|
|
|
if let euv::PlaceBase::Local(vid) = cmt.place.base {
|
2017-09-12 07:26:40 -05:00
|
|
|
self.moved_vars.insert(vid);
|
|
|
|
}
|
2017-02-18 02:00:36 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-10-04 08:00:01 -05:00
|
|
|
impl<'tcx> euv::Delegate<'tcx> for MovedVariablesCtxt {
|
2021-07-14 01:21:08 -05:00
|
|
|
fn consume(&mut self, cmt: &euv::PlaceWithHirId<'tcx>, _: HirId) {
|
|
|
|
self.move_common(cmt);
|
2017-02-18 02:00:36 -06:00
|
|
|
}
|
|
|
|
|
2020-11-01 01:15:22 -06:00
|
|
|
fn borrow(&mut self, _: &euv::PlaceWithHirId<'tcx>, _: HirId, _: ty::BorrowKind) {}
|
2017-02-18 02:00:36 -06:00
|
|
|
|
2020-11-01 01:15:22 -06:00
|
|
|
fn mutate(&mut self, _: &euv::PlaceWithHirId<'tcx>, _: HirId) {}
|
2021-02-25 14:33:18 -06:00
|
|
|
|
2021-03-25 13:29:11 -05:00
|
|
|
fn fake_read(&mut self, _: rustc_typeck::expr_use_visitor::Place<'tcx>, _: FakeReadCause, _: HirId) {}
|
2017-02-18 02:00:36 -06:00
|
|
|
}
|