Move PtrEq into Operators lin pass

clippy_lints/src/lib.register_all.rs

@@ -260,6 +260,7 @@
     LintId::of(operators::MISREFACTORED_ASSIGN_OP),
     LintId::of(operators::MODULO_ONE),
     LintId::of(operators::OP_REF),
+    LintId::of(operators::PTR_EQ),
     LintId::of(option_env_unwrap::OPTION_ENV_UNWRAP),
     LintId::of(overflow_check_conditional::OVERFLOW_CHECK_CONDITIONAL),
     LintId::of(partialeq_ne_impl::PARTIALEQ_NE_IMPL),
@@ -268,7 +269,6 @@
     LintId::of(ptr::INVALID_NULL_PTR_USAGE),
     LintId::of(ptr::MUT_FROM_REF),
     LintId::of(ptr::PTR_ARG),
-    LintId::of(ptr_eq::PTR_EQ),
     LintId::of(ptr_offset_with_cast::PTR_OFFSET_WITH_CAST),
     LintId::of(question_mark::QUESTION_MARK),
     LintId::of(ranges::MANUAL_RANGE_CONTAINS),

clippy_lints/src/lib.register_lints.rs

@@ -436,6 +436,7 @@
     operators::MODULO_ONE,
     operators::NEEDLESS_BITWISE_BOOL,
     operators::OP_REF,
+    operators::PTR_EQ,
     operators::VERBOSE_BIT_MASK,
     option_env_unwrap::OPTION_ENV_UNWRAP,
     option_if_let_else::OPTION_IF_LET_ELSE,
@@ -455,7 +456,6 @@
     ptr::INVALID_NULL_PTR_USAGE,
     ptr::MUT_FROM_REF,
     ptr::PTR_ARG,
-    ptr_eq::PTR_EQ,
     ptr_offset_with_cast::PTR_OFFSET_WITH_CAST,
     pub_use::PUB_USE,
     question_mark::QUESTION_MARK,

clippy_lints/src/lib.register_style.rs

@@ -98,9 +98,9 @@
     LintId::of(non_expressive_names::JUST_UNDERSCORES_AND_DIGITS),
     LintId::of(operators::ASSIGN_OP_PATTERN),
     LintId::of(operators::OP_REF),
+    LintId::of(operators::PTR_EQ),
     LintId::of(ptr::CMP_NULL),
     LintId::of(ptr::PTR_ARG),
-    LintId::of(ptr_eq::PTR_EQ),
     LintId::of(question_mark::QUESTION_MARK),
     LintId::of(ranges::MANUAL_RANGE_CONTAINS),
     LintId::of(redundant_field_names::REDUNDANT_FIELD_NAMES),

clippy_lints/src/lib.rs

@@ -335,7 +335,6 @@ macro_rules! declare_clippy_lint {
 mod pattern_type_mismatch;
 mod precedence;
 mod ptr;
-mod ptr_eq;
 mod ptr_offset_with_cast;
 mod pub_use;
 mod question_mark;
@@ -571,7 +570,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
     store.register_late_pass(|| Box::new(enum_clike::UnportableVariant));
     store.register_late_pass(|| Box::new(float_literal::FloatLiteral));
     store.register_late_pass(|| Box::new(ptr::Ptr));
-    store.register_late_pass(|| Box::new(ptr_eq::PtrEq));
     store.register_late_pass(|| Box::new(needless_bool::NeedlessBool));
     store.register_late_pass(|| Box::new(needless_bool::BoolComparison));
     store.register_late_pass(|| Box::new(needless_for_each::NeedlessForEach));

clippy_lints/src/operators/mod.rs

@@ -21,6 +21,7 @@
 mod needless_bitwise_bool;
 mod numeric_arithmetic;
 mod op_ref;
+mod ptr_eq;
 mod verbose_bit_mask;
 
 declare_clippy_lint! {
@@ -671,6 +672,35 @@
     "Boolean expressions that use bitwise rather than lazy operators"
 }
 
+declare_clippy_lint! {
+    /// ### What it does
+    /// Use `std::ptr::eq` when applicable
+    ///
+    /// ### Why is this bad?
+    /// `ptr::eq` can be used to compare `&T` references
+    /// (which coerce to `*const T` implicitly) by their address rather than
+    /// comparing the values they point to.
+    ///
+    /// ### Example
+    /// ```rust
+    /// let a = &[1, 2, 3];
+    /// let b = &[1, 2, 3];
+    ///
+    /// assert!(a as *const _ as usize == b as *const _ as usize);
+    /// ```
+    /// Use instead:
+    /// ```rust
+    /// let a = &[1, 2, 3];
+    /// let b = &[1, 2, 3];
+    ///
+    /// assert!(std::ptr::eq(a, b));
+    /// ```
+    #[clippy::version = "1.49.0"]
+    pub PTR_EQ,
+    style,
+    "use `std::ptr::eq` when comparing raw pointers"
+}
+
 pub struct Operators {
     arithmetic_context: numeric_arithmetic::Context,
     verbose_bit_mask_threshold: u64,
@@ -699,6 +729,7 @@ pub struct Operators {
     MODULO_ONE,
     MODULO_ARITHMETIC,
     NEEDLESS_BITWISE_BOOL,
+    PTR_EQ,
 ]);
 impl Operators {
     pub fn new(verbose_bit_mask_threshold: u64) -> Self {
@@ -722,6 +753,7 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
                     erasing_op::check(cx, e, op.node, lhs, rhs);
                     identity_op::check(cx, e, op.node, lhs, rhs);
                     needless_bitwise_bool::check(cx, e, op.node, lhs, rhs);
+                    ptr_eq::check(cx, e, op.node, lhs, rhs);
                 }
                 self.arithmetic_context.check_binary(cx, e, op.node, lhs, rhs);
                 bit_mask::check(cx, e, op.node, lhs, rhs);

clippy_lints/src/operators/ptr_eq.rs

@@ -0,0 +1,65 @@
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_opt;
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{BinOpKind, Expr, ExprKind};
+use rustc_lint::LateContext;
+
+use super::PTR_EQ;
+
+static LINT_MSG: &str = "use `std::ptr::eq` when comparing raw pointers";
+
+pub(super) fn check<'tcx>(
+    cx: &LateContext<'tcx>,
+    expr: &'tcx Expr<'_>,
+    op: BinOpKind,
+    left: &'tcx Expr<'_>,
+    right: &'tcx Expr<'_>,
+) {
+    if BinOpKind::Eq == op {
+        let (left, right) = match (expr_as_cast_to_usize(cx, left), expr_as_cast_to_usize(cx, right)) {
+            (Some(lhs), Some(rhs)) => (lhs, rhs),
+            _ => (left, right),
+        };
+
+        if_chain! {
+            if let Some(left_var) = expr_as_cast_to_raw_pointer(cx, left);
+            if let Some(right_var) = expr_as_cast_to_raw_pointer(cx, right);
+            if let Some(left_snip) = snippet_opt(cx, left_var.span);
+            if let Some(right_snip) = snippet_opt(cx, right_var.span);
+            then {
+                span_lint_and_sugg(
+                    cx,
+                    PTR_EQ,
+                    expr.span,
+                    LINT_MSG,
+                    "try",
+                    format!("std::ptr::eq({}, {})", left_snip, right_snip),
+                    Applicability::MachineApplicable,
+                    );
+            }
+        }
+    }
+}
+
+// If the given expression is a cast to a usize, return the lhs of the cast
+// E.g., `foo as *const _ as usize` returns `foo as *const _`.
+fn expr_as_cast_to_usize<'tcx>(cx: &LateContext<'tcx>, cast_expr: &'tcx Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
+    if cx.typeck_results().expr_ty(cast_expr) == cx.tcx.types.usize {
+        if let ExprKind::Cast(expr, _) = cast_expr.kind {
+            return Some(expr);
+        }
+    }
+    None
+}
+
+// If the given expression is a cast to a `*const` pointer, return the lhs of the cast
+// E.g., `foo as *const _` returns `foo`.
+fn expr_as_cast_to_raw_pointer<'tcx>(cx: &LateContext<'tcx>, cast_expr: &'tcx Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
+    if cx.typeck_results().expr_ty(cast_expr).is_unsafe_ptr() {
+        if let ExprKind::Cast(expr, _) = cast_expr.kind {
+            return Some(expr);
+        }
+    }
+    None
+}

clippy_lints/src/ptr_eq.rs

@@ -1,97 +0,0 @@
-use clippy_utils::diagnostics::span_lint_and_sugg;
-use clippy_utils::source::snippet_opt;
-use if_chain::if_chain;
-use rustc_errors::Applicability;
-use rustc_hir::{BinOpKind, Expr, ExprKind};
-use rustc_lint::{LateContext, LateLintPass};
-use rustc_session::{declare_lint_pass, declare_tool_lint};
-
-declare_clippy_lint! {
-    /// ### What it does
-    /// Use `std::ptr::eq` when applicable
-    ///
-    /// ### Why is this bad?
-    /// `ptr::eq` can be used to compare `&T` references
-    /// (which coerce to `*const T` implicitly) by their address rather than
-    /// comparing the values they point to.
-    ///
-    /// ### Example
-    /// ```rust
-    /// let a = &[1, 2, 3];
-    /// let b = &[1, 2, 3];
-    ///
-    /// assert!(a as *const _ as usize == b as *const _ as usize);
-    /// ```
-    /// Use instead:
-    /// ```rust
-    /// let a = &[1, 2, 3];
-    /// let b = &[1, 2, 3];
-    ///
-    /// assert!(std::ptr::eq(a, b));
-    /// ```
-    #[clippy::version = "1.49.0"]
-    pub PTR_EQ,
-    style,
-    "use `std::ptr::eq` when comparing raw pointers"
-}
-
-declare_lint_pass!(PtrEq => [PTR_EQ]);
-
-static LINT_MSG: &str = "use `std::ptr::eq` when comparing raw pointers";
-
-impl<'tcx> LateLintPass<'tcx> for PtrEq {
-    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
-        if expr.span.from_expansion() {
-            return;
-        }
-
-        if let ExprKind::Binary(ref op, left, right) = expr.kind {
-            if BinOpKind::Eq == op.node {
-                let (left, right) = match (expr_as_cast_to_usize(cx, left), expr_as_cast_to_usize(cx, right)) {
-                    (Some(lhs), Some(rhs)) => (lhs, rhs),
-                    _ => (left, right),
-                };
-
-                if_chain! {
-                    if let Some(left_var) = expr_as_cast_to_raw_pointer(cx, left);
-                    if let Some(right_var) = expr_as_cast_to_raw_pointer(cx, right);
-                    if let Some(left_snip) = snippet_opt(cx, left_var.span);
-                    if let Some(right_snip) = snippet_opt(cx, right_var.span);
-                    then {
-                        span_lint_and_sugg(
-                            cx,
-                            PTR_EQ,
-                            expr.span,
-                            LINT_MSG,
-                            "try",
-                            format!("std::ptr::eq({}, {})", left_snip, right_snip),
-                            Applicability::MachineApplicable,
-                            );
-                    }
-                }
-            }
-        }
-    }
-}
-
-// If the given expression is a cast to a usize, return the lhs of the cast
-// E.g., `foo as *const _ as usize` returns `foo as *const _`.
-fn expr_as_cast_to_usize<'tcx>(cx: &LateContext<'tcx>, cast_expr: &'tcx Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
-    if cx.typeck_results().expr_ty(cast_expr) == cx.tcx.types.usize {
-        if let ExprKind::Cast(expr, _) = cast_expr.kind {
-            return Some(expr);
-        }
-    }
-    None
-}
-
-// If the given expression is a cast to a `*const` pointer, return the lhs of the cast
-// E.g., `foo as *const _` returns `foo`.
-fn expr_as_cast_to_raw_pointer<'tcx>(cx: &LateContext<'tcx>, cast_expr: &'tcx Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
-    if cx.typeck_results().expr_ty(cast_expr).is_unsafe_ptr() {
-        if let ExprKind::Cast(expr, _) = cast_expr.kind {
-            return Some(expr);
-        }
-    }
-    None
-}