don't remove dbg! in arbitrary expressions
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y21
parent
7bc3da975a
commit
cc607fe32e
@ -3,10 +3,10 @@ use clippy_utils::macros::root_macro_call_first_node;
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use clippy_utils::source::snippet_with_applicability;
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use clippy_utils::{is_in_cfg_test, is_in_test_function};
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use rustc_errors::Applicability;
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use rustc_hir::{Expr, ExprKind};
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use rustc_lint::{LateContext, LateLintPass};
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use rustc_hir::{Expr, ExprKind, Node, Stmt, StmtKind};
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use rustc_lint::{LateContext, LateLintPass, LintContext};
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use rustc_session::{declare_tool_lint, impl_lint_pass};
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use rustc_span::sym;
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use rustc_span::{sym, Span};
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declare_clippy_lint! {
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/// ### What it does
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@ -31,6 +31,11 @@ declare_clippy_lint! {
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"`dbg!` macro is intended as a debugging tool"
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}
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fn span_including_semi(cx: &LateContext<'_>, span: Span) -> Span {
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let span = cx.sess().source_map().span_extend_to_next_char(span, ';', true);
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span.with_hi(span.hi() + rustc_span::BytePos(1))
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}
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#[derive(Copy, Clone)]
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pub struct DbgMacro {
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allow_dbg_in_tests: bool,
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@ -55,13 +60,24 @@ impl LateLintPass<'_> for DbgMacro {
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return;
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}
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let mut applicability = Applicability::MachineApplicable;
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let suggestion = match expr.peel_drop_temps().kind {
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// dbg!()
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ExprKind::Block(_, _) => String::new(),
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// dbg!(1)
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ExprKind::Match(val, ..) => {
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snippet_with_applicability(cx, val.span.source_callsite(), "..", &mut applicability).to_string()
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let (sugg_span, suggestion) = match expr.peel_drop_temps().kind {
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ExprKind::Block(..) => match cx.tcx.hir().find_parent(expr.hir_id) {
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// dbg!() as a standalone statement, suggest removing the whole statement entirely
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Some(Node::Stmt(
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stmt @ Stmt {
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kind: StmtKind::Semi(_),
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..
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},
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)) => (span_including_semi(cx, stmt.span.source_callsite()), String::new()),
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// empty dbg!() in arbitrary position (e.g. `foo(dbg!())`), suggest replacing with `foo(())`
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_ => (macro_call.span, String::from("()")),
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},
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// dbg!(1)
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ExprKind::Match(val, ..) => (
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macro_call.span,
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snippet_with_applicability(cx, val.span.source_callsite(), "..", &mut applicability).to_string(),
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),
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// dbg!(2, 3)
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ExprKind::Tup(
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[
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@ -82,7 +98,7 @@ impl LateLintPass<'_> for DbgMacro {
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"..",
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&mut applicability,
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);
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format!("({snippet})")
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(macro_call.span, format!("({snippet})"))
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},
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_ => return,
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};
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@ -90,7 +106,7 @@ impl LateLintPass<'_> for DbgMacro {
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span_lint_and_sugg(
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cx,
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DBG_MACRO,
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macro_call.span,
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sugg_span,
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"the `dbg!` macro is intended as a debugging tool",
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"remove the invocation before committing it to a version control system",
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suggestion,
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@ -4,6 +4,7 @@
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fn foo(n: u32) -> u32 {
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if let Some(n) = dbg!(n.checked_sub(4)) { n } else { n }
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}
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fn bar(_: ()) {}
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fn factorial(n: u32) -> u32 {
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if dbg!(n <= 1) {
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@ -21,6 +22,13 @@ fn main() {
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dbg!(1, 2, 3, 4, 5);
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}
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fn issue9914() {
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dbg!();
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#[allow(clippy::let_unit_value)]
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let _ = dbg!();
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bar(dbg!());
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}
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mod issue7274 {
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trait Thing<'b> {
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fn foo(&self);
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@ -11,7 +11,7 @@ LL | if let Some(n) = n.checked_sub(4) { n } else { n }
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| ~~~~~~~~~~~~~~~~
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:9:8
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--> $DIR/dbg_macro.rs:10:8
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LL | if dbg!(n <= 1) {
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| ^^^^^^^^^^^^
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@ -22,7 +22,7 @@ LL | if n <= 1 {
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| ~~~~~~
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:10:9
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--> $DIR/dbg_macro.rs:11:9
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LL | dbg!(1)
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| ^^^^^^^
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@ -33,7 +33,7 @@ LL | 1
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:12:9
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--> $DIR/dbg_macro.rs:13:9
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LL | dbg!(n * factorial(n - 1))
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^
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@ -44,7 +44,7 @@ LL | n * factorial(n - 1)
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:17:5
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--> $DIR/dbg_macro.rs:18:5
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LL | dbg!(42);
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| ^^^^^^^^
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@ -55,7 +55,7 @@ LL | 42;
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| ~~
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:18:5
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--> $DIR/dbg_macro.rs:19:5
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LL | dbg!(dbg!(dbg!(42)));
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| ^^^^^^^^^^^^^^^^^^^^
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@ -66,7 +66,7 @@ LL | dbg!(dbg!(42));
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| ~~~~~~~~~~~~~~
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:19:14
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--> $DIR/dbg_macro.rs:20:14
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LL | foo(3) + dbg!(factorial(4));
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| ^^^^^^^^^^^^^^^^^^
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@ -77,7 +77,7 @@ LL | foo(3) + factorial(4);
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| ~~~~~~~~~~~~
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:20:5
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--> $DIR/dbg_macro.rs:21:5
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LL | dbg!(1, 2, dbg!(3, 4));
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| ^^^^^^^^^^^^^^^^^^^^^^
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@ -88,7 +88,7 @@ LL | (1, 2, dbg!(3, 4));
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| ~~~~~~~~~~~~~~~~~~
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:21:5
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--> $DIR/dbg_macro.rs:22:5
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LL | dbg!(1, 2, 3, 4, 5);
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| ^^^^^^^^^^^^^^^^^^^
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@ -99,7 +99,41 @@ LL | (1, 2, 3, 4, 5);
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| ~~~~~~~~~~~~~~~
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:41:9
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--> $DIR/dbg_macro.rs:26:5
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LL | dbg!();
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| ^^^^^^^
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help: remove the invocation before committing it to a version control system
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LL - dbg!();
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LL +
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:28:13
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LL | let _ = dbg!();
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| ^^^^^^
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help: remove the invocation before committing it to a version control system
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LL | let _ = ();
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| ~~
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:29:9
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LL | bar(dbg!());
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| ^^^^^^
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help: remove the invocation before committing it to a version control system
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LL | bar(());
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| ~~
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:49:9
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LL | dbg!(2);
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| ^^^^^^^
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@ -110,7 +144,7 @@ LL | 2;
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| ~
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:47:5
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--> $DIR/dbg_macro.rs:55:5
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LL | dbg!(1);
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| ^^^^^^^
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@ -121,7 +155,7 @@ LL | 1;
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| ~
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:52:5
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--> $DIR/dbg_macro.rs:60:5
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LL | dbg!(1);
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| ^^^^^^^
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@ -132,7 +166,7 @@ LL | 1;
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| ~
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error: the `dbg!` macro is intended as a debugging tool
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--> $DIR/dbg_macro.rs:58:9
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--> $DIR/dbg_macro.rs:66:9
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LL | dbg!(1);
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| ^^^^^^^
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@ -142,5 +176,5 @@ help: remove the invocation before committing it to a version control system
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LL | 1;
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| ~
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error: aborting due to 13 previous errors
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error: aborting due to 16 previous errors
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