From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/tools/clippy/clippy_lints/src/borrow_as_ptr.rs | 99 ++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 src/tools/clippy/clippy_lints/src/borrow_as_ptr.rs

(limited to 'src/tools/clippy/clippy_lints/src/borrow_as_ptr.rs')

diff --git a/src/tools/clippy/clippy_lints/src/borrow_as_ptr.rs b/src/tools/clippy/clippy_lints/src/borrow_as_ptr.rs
new file mode 100644
index 000000000..0993adbae
--- /dev/null
+++ b/src/tools/clippy/clippy_lints/src/borrow_as_ptr.rs
@@ -0,0 +1,99 @@
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::is_no_std_crate;
+use clippy_utils::source::snippet_opt;
+use clippy_utils::{meets_msrv, msrvs};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{BorrowKind, Expr, ExprKind, Mutability, TyKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+
+declare_clippy_lint! {
+    /// ### What it does
+    /// Checks for the usage of `&expr as *const T` or
+    /// `&mut expr as *mut T`, and suggest using `ptr::addr_of` or
+    /// `ptr::addr_of_mut` instead.
+    ///
+    /// ### Why is this bad?
+    /// This would improve readability and avoid creating a reference
+    /// that points to an uninitialized value or unaligned place.
+    /// Read the `ptr::addr_of` docs for more information.
+    ///
+    /// ### Example
+    /// ```rust
+    /// let val = 1;
+    /// let p = &val as *const i32;
+    ///
+    /// let mut val_mut = 1;
+    /// let p_mut = &mut val_mut as *mut i32;
+    /// ```
+    /// Use instead:
+    /// ```rust
+    /// let val = 1;
+    /// let p = std::ptr::addr_of!(val);
+    ///
+    /// let mut val_mut = 1;
+    /// let p_mut = std::ptr::addr_of_mut!(val_mut);
+    /// ```
+    #[clippy::version = "1.60.0"]
+    pub BORROW_AS_PTR,
+    pedantic,
+    "borrowing just to cast to a raw pointer"
+}
+
+impl_lint_pass!(BorrowAsPtr => [BORROW_AS_PTR]);
+
+pub struct BorrowAsPtr {
+    msrv: Option<RustcVersion>,
+}
+
+impl BorrowAsPtr {
+    #[must_use]
+    pub fn new(msrv: Option<RustcVersion>) -> Self {
+        Self { msrv }
+    }
+}
+
+impl<'tcx> LateLintPass<'tcx> for BorrowAsPtr {
+    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+        if !meets_msrv(self.msrv, msrvs::BORROW_AS_PTR) {
+            return;
+        }
+
+        if expr.span.from_expansion() {
+            return;
+        }
+
+        if_chain! {
+            if let ExprKind::Cast(left_expr, ty) = &expr.kind;
+            if let TyKind::Ptr(_) = ty.kind;
+            if let ExprKind::AddrOf(BorrowKind::Ref, mutability, e) = &left_expr.kind;
+
+            then {
+                let core_or_std = if is_no_std_crate(cx) { "core" } else { "std" };
+                let macro_name = match mutability {
+                    Mutability::Not => "addr_of",
+                    Mutability::Mut => "addr_of_mut",
+                };
+
+                span_lint_and_sugg(
+                    cx,
+                    BORROW_AS_PTR,
+                    expr.span,
+                    "borrow as raw pointer",
+                    "try",
+                    format!(
+                        "{}::ptr::{}!({})",
+                        core_or_std,
+                        macro_name,
+                        snippet_opt(cx, e.span).unwrap()
+                    ),
+                    Applicability::MachineApplicable,
+                );
+            }
+        }
+    }
+
+    extract_msrv_attr!(LateContext);
+}
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