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Fix and improve internal lint checking for match_type usages

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* Check for `const`s and `static`s from external crates
* Check for `LangItem`s
* Handle inherent functions which have the same name as a field
* Also check the following functions:
    * `match_trait_method`
    * `match_def_path`
    * `is_expr_path_def_path`
    * `is_qpath_def_path`
* Handle checking for a constructor to a diagnostic item or `LangItem`
This commit is contained in:
Jason Newcomb 2021-11-11 14:15:01 -05:00
parent 8e7af6b429
commit 162aa19793
26 changed files with 539 additions and 181 deletions
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7
clippy_lints/src/methods/filetype_is_file.rs
View file

@ -1,17 +1,18 @@
use clippy_utils::diagnostics::span_lint_and_help;
use clippy_utils::ty::match_type;
use clippy_utils::{get_parent_expr, paths};
use clippy_utils::get_parent_expr;
use clippy_utils::ty::is_type_diagnostic_item;
use if_chain::if_chain;
use rustc_hir as hir;
use rustc_lint::LateContext;
use rustc_span::source_map::Span;
use rustc_span::sym;
use super::FILETYPE_IS_FILE;
pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, recv: &hir::Expr<'_>) {
let ty = cx.typeck_results().expr_ty(recv);
if !match_type(cx, ty, &paths::FILE_TYPE) {
if !is_type_diagnostic_item(cx, ty, sym::FileType) {
return;
}

2
clippy_lints/src/methods/inefficient_to_string.rs
View file

@ -65,7 +65,7 @@ fn specializes_tostring(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
}
if let ty::Adt(adt, substs) = ty.kind() {
match_def_path(cx, adt.did(), &paths::COW) && substs.type_at(1).is_str()
cx.tcx.is_diagnostic_item(sym::Cow, adt.did()) && substs.type_at(1).is_str()
} else {
false
}

8
clippy_lints/src/methods/manual_str_repeat.rs
View file

@ -1,8 +1,8 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::is_path_diagnostic_item;
use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
use clippy_utils::sugg::Sugg;
use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item, match_type};
use clippy_utils::{is_expr_path_def_path, paths};
use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item};
use if_chain::if_chain;
use rustc_ast::LitKind;
use rustc_errors::Applicability;
@ -38,7 +38,7 @@ fn parse_repeat_arg(cx: &LateContext<'_>, e: &Expr<'_>) -> Option<RepeatKind> {
let ty = cx.typeck_results().expr_ty(e);
if is_type_diagnostic_item(cx, ty, sym::String)
|| (is_type_lang_item(cx, ty, LangItem::OwnedBox) && get_ty_param(ty).map_or(false, Ty::is_str))
|| (match_type(cx, ty, &paths::COW) && get_ty_param(ty).map_or(false, Ty::is_str))
|| (is_type_diagnostic_item(cx, ty, sym::Cow) && get_ty_param(ty).map_or(false, Ty::is_str))
{
Some(RepeatKind::String)
} else {
@ -57,7 +57,7 @@ pub(super) fn check(
) {
if_chain! {
if let ExprKind::Call(repeat_fn, [repeat_arg]) = take_self_arg.kind;
if is_expr_path_def_path(cx, repeat_fn, &paths::ITER_REPEAT);
if is_path_diagnostic_item(cx, repeat_fn, sym::iter_repeat);
if is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(collect_expr), sym::String);
if let Some(collect_id) = cx.typeck_results().type_dependent_def_id(collect_expr.hir_id);
if let Some(take_id) = cx.typeck_results().type_dependent_def_id(take_expr.hir_id);

5
clippy_lints/src/methods/useless_asref.rs
View file

@ -1,11 +1,12 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet_with_applicability;
use clippy_utils::ty::walk_ptrs_ty_depth;
use clippy_utils::{get_parent_expr, match_trait_method, paths};
use clippy_utils::{get_parent_expr, is_trait_method};
use if_chain::if_chain;
use rustc_errors::Applicability;
use rustc_hir as hir;
use rustc_lint::LateContext;
use rustc_span::sym;
use super::USELESS_ASREF;
@ -13,7 +14,7 @@ use super::USELESS_ASREF;
pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, call_name: &str, recvr: &hir::Expr<'_>) {
// when we get here, we've already checked that the call name is "as_ref" or "as_mut"
// check if the call is to the actual `AsRef` or `AsMut` trait
if match_trait_method(cx, expr, &paths::ASREF_TRAIT) || match_trait_method(cx, expr, &paths::ASMUT_TRAIT) {
if is_trait_method(cx, expr, sym::AsRef) || is_trait_method(cx, expr, sym::AsMut) {
// check if the type after `as_ref` or `as_mut` is the same as before
let rcv_ty = cx.typeck_results().expr_ty(recvr);
let res_ty = cx.typeck_results().expr_ty(expr);