Rollup merge of #79145 - camelid:clippy-fix-panics, r=flip1995

Fix handling of panic calls

This should make Clippy more resilient and will unblock #78343.

This PR is made against rust-lang/rust to avoid the need for a subtree
sync at ``@flip1995's`` suggestion in rust-lang#6310.

r? ``@flip1995``
cc ``@m-ou-se``

clippy_lints/src/assertions_on_constants.rs

@@ -1,6 +1,5 @@
 use crate::consts::{constant, Constant};
-use crate::utils::paths;
-use crate::utils::{is_direct_expn_of, is_expn_of, match_function_call, snippet_opt, span_lint_and_help};
+use crate::utils::{is_direct_expn_of, is_expn_of, match_panic_call, snippet_opt, span_lint_and_help};
 use if_chain::if_chain;
 use rustc_ast::ast::LitKind;
 use rustc_hir::{Expr, ExprKind, PatKind, UnOp};
@@ -133,7 +132,7 @@ fn match_assert_with_message<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>)
         if let ExprKind::Block(ref inner_block, _) = block_expr.kind;
         if let Some(begin_panic_call) = &inner_block.expr;
         // function call
-        if let Some(args) = match_function_call(cx, begin_panic_call, &paths::BEGIN_PANIC);
+        if let Some(args) = match_panic_call(cx, begin_panic_call);
         if args.len() == 1;
         // bind the second argument of the `assert!` macro if it exists
         if let panic_message = snippet_opt(cx, args[0].span);

clippy_lints/src/attrs.rs

@@ -1,7 +1,7 @@
 //! checks for attributes
 
 use crate::utils::{
-    first_line_of_span, is_present_in_source, match_def_path, paths, snippet_opt, span_lint, span_lint_and_help,
+    first_line_of_span, is_present_in_source, match_panic_def_id, snippet_opt, span_lint, span_lint_and_help,
     span_lint_and_sugg, span_lint_and_then, without_block_comments,
 };
 use if_chain::if_chain;
@@ -513,7 +513,7 @@ fn is_relevant_expr(cx: &LateContext<'_>, typeck_results: &ty::TypeckResults<'_>
                 typeck_results
                     .qpath_res(qpath, path_expr.hir_id)
                     .opt_def_id()
-                    .map_or(true, |fun_id| !match_def_path(cx, fun_id, &paths::BEGIN_PANIC))
+                    .map_or(true, |fun_id| !match_panic_def_id(cx, fun_id))
             } else {
                 true
             }

clippy_lints/src/fallible_impl_from.rs

@@ -1,5 +1,7 @@
-use crate::utils::paths::{BEGIN_PANIC, BEGIN_PANIC_FMT, FROM_TRAIT};
-use crate::utils::{is_expn_of, is_type_diagnostic_item, match_def_path, method_chain_args, span_lint_and_then};
+use crate::utils::paths::FROM_TRAIT;
+use crate::utils::{
+    is_expn_of, is_type_diagnostic_item, match_def_path, match_panic_def_id, method_chain_args, span_lint_and_then,
+};
 use if_chain::if_chain;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
@@ -84,8 +86,7 @@ fn lint_impl_body<'tcx>(cx: &LateContext<'tcx>, impl_span: Span, impl_items: &[h
                 if let ExprKind::Call(ref func_expr, _) = expr.kind;
                 if let ExprKind::Path(QPath::Resolved(_, ref path)) = func_expr.kind;
                 if let Some(path_def_id) = path.res.opt_def_id();
-                if match_def_path(self.lcx, path_def_id, &BEGIN_PANIC) ||
-                    match_def_path(self.lcx, path_def_id, &BEGIN_PANIC_FMT);
+                if match_panic_def_id(self.lcx, path_def_id);
                 if is_expn_of(expr.span, "unreachable").is_none();
                 then {
                     self.result.push(expr.span);

clippy_lints/src/implicit_return.rs

@@ -1,8 +1,4 @@
-use crate::utils::{
-    fn_has_unsatisfiable_preds, match_def_path,
-    paths::{BEGIN_PANIC, BEGIN_PANIC_FMT},
-    snippet_opt, span_lint_and_then,
-};
+use crate::utils::{fn_has_unsatisfiable_preds, match_panic_def_id, snippet_opt, span_lint_and_then};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::FnKind;
@@ -109,8 +105,7 @@ fn expr_match(cx: &LateContext<'_>, expr: &Expr<'_>) {
             if_chain! {
                 if let ExprKind::Path(qpath) = &expr.kind;
                 if let Some(path_def_id) = cx.qpath_res(qpath, expr.hir_id).opt_def_id();
-                if match_def_path(cx, path_def_id, &BEGIN_PANIC) ||
-                    match_def_path(cx, path_def_id, &BEGIN_PANIC_FMT);
+                if match_panic_def_id(cx, path_def_id);
                 then { }
                 else {
                     lint(cx, expr.span, expr.span, LINT_RETURN)

clippy_lints/src/panic_unimplemented.rs

@@ -1,4 +1,4 @@
-use crate::utils::{is_direct_expn_of, is_expn_of, match_function_call, paths, span_lint};
+use crate::utils::{is_direct_expn_of, is_expn_of, match_panic_call, span_lint};
 use if_chain::if_chain;
 use rustc_ast::ast::LitKind;
 use rustc_hir::{Expr, ExprKind};
@@ -93,27 +93,27 @@ declare_lint_pass!(PanicUnimplemented => [PANIC_PARAMS, UNIMPLEMENTED, UNREACHAB
 
 impl<'tcx> LateLintPass<'tcx> for PanicUnimplemented {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
-        if_chain! {
-            if let ExprKind::Block(ref block, _) = expr.kind;
-            if let Some(ref ex) = block.expr;
-            if let Some(params) = match_function_call(cx, ex, &paths::BEGIN_PANIC)
-                .or_else(|| match_function_call(cx, ex, &paths::BEGIN_PANIC_FMT));
-            then {
-                let span = get_outer_span(expr);
-                if is_expn_of(expr.span, "unimplemented").is_some() {
-                    span_lint(cx, UNIMPLEMENTED, span,
-                              "`unimplemented` should not be present in production code");
-                } else if is_expn_of(expr.span, "todo").is_some() {
-                    span_lint(cx, TODO, span,
-                              "`todo` should not be present in production code");
-                } else if is_expn_of(expr.span, "unreachable").is_some() {
-                    span_lint(cx, UNREACHABLE, span,
-                              "`unreachable` should not be present in production code");
-                } else if is_expn_of(expr.span, "panic").is_some() {
-                    span_lint(cx, PANIC, span,
-                              "`panic` should not be present in production code");
-                    match_panic(params, expr, cx);
-                }
+        if let Some(params) = match_panic_call(cx, expr) {
+            let span = get_outer_span(expr);
+            if is_expn_of(expr.span, "unimplemented").is_some() {
+                span_lint(
+                    cx,
+                    UNIMPLEMENTED,
+                    span,
+                    "`unimplemented` should not be present in production code",
+                );
+            } else if is_expn_of(expr.span, "todo").is_some() {
+                span_lint(cx, TODO, span, "`todo` should not be present in production code");
+            } else if is_expn_of(expr.span, "unreachable").is_some() {
+                span_lint(
+                    cx,
+                    UNREACHABLE,
+                    span,
+                    "`unreachable` should not be present in production code",
+                );
+            } else if is_expn_of(expr.span, "panic").is_some() {
+                span_lint(cx, PANIC, span, "`panic` should not be present in production code");
+                match_panic(params, expr, cx);
             }
         }
     }

clippy_lints/src/utils/mod.rs

@@ -1196,7 +1196,7 @@ pub fn has_iter_method(cx: &LateContext<'_>, probably_ref_ty: Ty<'_>) -> Option<
 /// Usage:
 ///
 /// ```rust,ignore
-/// if let Some(args) = match_function_call(cx, begin_panic_call, &paths::BEGIN_PANIC);
+/// if let Some(args) = match_function_call(cx, cmp_max_call, &paths::CMP_MAX);
 /// ```
 pub fn match_function_call<'tcx>(
     cx: &LateContext<'tcx>,
@@ -1231,6 +1231,24 @@ pub fn match_def_path<'tcx>(cx: &LateContext<'tcx>, did: DefId, syms: &[&str]) -
     cx.match_def_path(did, &syms)
 }
 
+pub fn match_panic_call<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<&'tcx [Expr<'tcx>]> {
+    match_function_call(cx, expr, &paths::BEGIN_PANIC)
+        .or_else(|| match_function_call(cx, expr, &paths::BEGIN_PANIC_FMT))
+        .or_else(|| match_function_call(cx, expr, &paths::PANIC_ANY))
+        .or_else(|| match_function_call(cx, expr, &paths::PANICKING_PANIC))
+        .or_else(|| match_function_call(cx, expr, &paths::PANICKING_PANIC_FMT))
+        .or_else(|| match_function_call(cx, expr, &paths::PANICKING_PANIC_STR))
+}
+
+pub fn match_panic_def_id(cx: &LateContext<'_>, did: DefId) -> bool {
+    match_def_path(cx, did, &paths::BEGIN_PANIC)
+        || match_def_path(cx, did, &paths::BEGIN_PANIC_FMT)
+        || match_def_path(cx, did, &paths::PANIC_ANY)
+        || match_def_path(cx, did, &paths::PANICKING_PANIC)
+        || match_def_path(cx, did, &paths::PANICKING_PANIC_FMT)
+        || match_def_path(cx, did, &paths::PANICKING_PANIC_STR)
+}
+
 /// Returns the list of condition expressions and the list of blocks in a
 /// sequence of `if/else`.
 /// E.g., this returns `([a, b], [c, d, e])` for the expression

clippy_lints/src/utils/paths.rs

@@ -8,8 +8,8 @@ pub const ANY_TRAIT: [&str; 3] = ["std", "any", "Any"];
 pub const ARC_PTR_EQ: [&str; 4] = ["alloc", "sync", "Arc", "ptr_eq"];
 pub const ASMUT_TRAIT: [&str; 3] = ["core", "convert", "AsMut"];
 pub const ASREF_TRAIT: [&str; 3] = ["core", "convert", "AsRef"];
-pub const BEGIN_PANIC: [&str; 3] = ["std", "panicking", "begin_panic"];
-pub const BEGIN_PANIC_FMT: [&str; 3] = ["std", "panicking", "begin_panic_fmt"];
+pub(super) const BEGIN_PANIC: [&str; 3] = ["std", "panicking", "begin_panic"];
+pub(super) const BEGIN_PANIC_FMT: [&str; 3] = ["std", "panicking", "begin_panic_fmt"];
 pub const BINARY_HEAP: [&str; 4] = ["alloc", "collections", "binary_heap", "BinaryHeap"];
 pub const BORROW_TRAIT: [&str; 3] = ["core", "borrow", "Borrow"];
 pub const BOX: [&str; 3] = ["alloc", "boxed", "Box"];
@@ -78,6 +78,10 @@ pub const ORD: [&str; 3] = ["core", "cmp", "Ord"];
 pub const OS_STRING: [&str; 4] = ["std", "ffi", "os_str", "OsString"];
 pub const OS_STRING_AS_OS_STR: [&str; 5] = ["std", "ffi", "os_str", "OsString", "as_os_str"];
 pub const OS_STR_TO_OS_STRING: [&str; 5] = ["std", "ffi", "os_str", "OsStr", "to_os_string"];
+pub(super) const PANICKING_PANIC: [&str; 3] = ["core", "panicking", "panic"];
+pub(super) const PANICKING_PANIC_FMT: [&str; 3] = ["core", "panicking", "panic_fmt"];
+pub(super) const PANICKING_PANIC_STR: [&str; 3] = ["core", "panicking", "panic_str"];
+pub(super) const PANIC_ANY: [&str; 3] = ["std", "panic", "panic_any"];
 pub const PARKING_LOT_MUTEX_GUARD: [&str; 2] = ["parking_lot", "MutexGuard"];
 pub const PARKING_LOT_RWLOCK_READ_GUARD: [&str; 2] = ["parking_lot", "RwLockReadGuard"];
 pub const PARKING_LOT_RWLOCK_WRITE_GUARD: [&str; 2] = ["parking_lot", "RwLockWriteGuard"];

tests/ui/panicking_macros.rs

@@ -1,6 +1,8 @@
 #![warn(clippy::unimplemented, clippy::unreachable, clippy::todo, clippy::panic)]
 #![allow(clippy::assertions_on_constants)]
 
+extern crate core;
+
 fn panic() {
     let a = 2;
     panic!();
@@ -33,9 +35,18 @@ fn unreachable() {
     let b = a + 2;
 }
 
+fn core_versions() {
+    use core::{panic, todo, unimplemented, unreachable};
+    panic!();
+    todo!();
+    unimplemented!();
+    unreachable!();
+}
+
 fn main() {
     panic();
     todo();
     unimplemented();
     unreachable();
+    core_versions();
 }

tests/ui/panicking_macros.stderr

@@ -1,88 +1,112 @@
 error: `panic` should not be present in production code
-  --> $DIR/panicking_macros.rs:6:5
+  --> $DIR/panicking_macros.rs:8:5
    |
 LL |     panic!();
    |     ^^^^^^^^^
    |
    = note: `-D clippy::panic` implied by `-D warnings`
 
 error: `panic` should not be present in production code
-  --> $DIR/panicking_macros.rs:7:5
+  --> $DIR/panicking_macros.rs:9:5
    |
 LL |     panic!("message");
    |     ^^^^^^^^^^^^^^^^^^
    |
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: `panic` should not be present in production code
-  --> $DIR/panicking_macros.rs:8:5
+  --> $DIR/panicking_macros.rs:10:5
    |
 LL |     panic!("{} {}", "panic with", "multiple arguments");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: `todo` should not be present in production code
-  --> $DIR/panicking_macros.rs:14:5
+  --> $DIR/panicking_macros.rs:16:5
    |
 LL |     todo!();
    |     ^^^^^^^^
    |
    = note: `-D clippy::todo` implied by `-D warnings`
 
 error: `todo` should not be present in production code
-  --> $DIR/panicking_macros.rs:15:5
+  --> $DIR/panicking_macros.rs:17:5
    |
 LL |     todo!("message");
    |     ^^^^^^^^^^^^^^^^^
 
 error: `todo` should not be present in production code
-  --> $DIR/panicking_macros.rs:16:5
+  --> $DIR/panicking_macros.rs:18:5
    |
 LL |     todo!("{} {}", "panic with", "multiple arguments");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: `unimplemented` should not be present in production code
-  --> $DIR/panicking_macros.rs:22:5
+  --> $DIR/panicking_macros.rs:24:5
    |
 LL |     unimplemented!();
    |     ^^^^^^^^^^^^^^^^^
    |
    = note: `-D clippy::unimplemented` implied by `-D warnings`
 
 error: `unimplemented` should not be present in production code
-  --> $DIR/panicking_macros.rs:23:5
+  --> $DIR/panicking_macros.rs:25:5
    |
 LL |     unimplemented!("message");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: `unimplemented` should not be present in production code
-  --> $DIR/panicking_macros.rs:24:5
+  --> $DIR/panicking_macros.rs:26:5
    |
 LL |     unimplemented!("{} {}", "panic with", "multiple arguments");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: `unreachable` should not be present in production code
-  --> $DIR/panicking_macros.rs:30:5
+  --> $DIR/panicking_macros.rs:32:5
    |
 LL |     unreachable!();
    |     ^^^^^^^^^^^^^^^
    |
    = note: `-D clippy::unreachable` implied by `-D warnings`
 
 error: `unreachable` should not be present in production code
-  --> $DIR/panicking_macros.rs:31:5
+  --> $DIR/panicking_macros.rs:33:5
    |
 LL |     unreachable!("message");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: `unreachable` should not be present in production code
-  --> $DIR/panicking_macros.rs:32:5
+  --> $DIR/panicking_macros.rs:34:5
    |
 LL |     unreachable!("{} {}", "panic with", "multiple arguments");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 12 previous errors
+error: `panic` should not be present in production code
+  --> $DIR/panicking_macros.rs:40:5
+   |
+LL |     panic!();
+   |     ^^^^^^^^^
+
+error: `todo` should not be present in production code
+  --> $DIR/panicking_macros.rs:41:5
+   |
+LL |     todo!();
+   |     ^^^^^^^^
+
+error: `unimplemented` should not be present in production code
+  --> $DIR/panicking_macros.rs:42:5
+   |
+LL |     unimplemented!();
+   |     ^^^^^^^^^^^^^^^^^
+
+error: `unreachable` should not be present in production code
+  --> $DIR/panicking_macros.rs:43:5
+   |
+LL |     unreachable!();
+   |     ^^^^^^^^^^^^^^^
+
+error: aborting due to 16 previous errors