Auto merge of rust-lang#126771 - workingjubilee:rollup-wjof1kc, r=workingjubilee

Rollup of 9 pull requests

Successful merges:

 - rust-lang#124101 (Add PidFd::{kill, wait, try_wait})
 - rust-lang#126125 (Improve conflict marker recovery)
 - rust-lang#126481 (Add `powerpc-unknown-openbsd` maintaince status)
 - rust-lang#126613 (Print the tested value in int_log tests)
 - rust-lang#126617 (Expand `avx512_target_feature` to include VEX variants)
 - rust-lang#126707 (Pass target to inaccessible-temp-dir rmake test)
 - rust-lang#126712 (Migrate `relocation-model`, `error-writing-dependencies` and `crate-name-priority` `run-make` tests to rmake)
 - rust-lang#126757 (Properly gate `safe` keyword in pre-expansion)
 - rust-lang#126758 (Do not allow safe/unsafe on static and fn items)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_ast_passes/messages.ftl

@@ -30,6 +30,9 @@ ast_passes_auto_super_lifetime = auto traits cannot have super traits or lifetim
 
 ast_passes_bad_c_variadic = only foreign or `unsafe extern "C"` functions may be C-variadic
 
+ast_passes_bare_fn_invalid_safety = function pointers cannot be declared with `safe` safety qualifier
+    .suggestion = remove safe from this item
+
 ast_passes_body_in_extern = incorrect `{$kind}` inside `extern` block
     .cannot_have = cannot have a body
     .invalid = the invalid body
@@ -167,6 +170,9 @@ ast_passes_invalid_unnamed_field_ty =
     unnamed fields can only have struct or union types
     .label = not a struct or union
 
+ast_passes_item_invalid_safety = items outside of `unsafe extern {"{ }"}` cannot be declared with `safe` safety qualifier
+    .suggestion = remove safe from this item
+
 ast_passes_item_underscore = `{$kind}` items in this context need a name
     .label = `_` is not a valid name for this `{$kind}` item
 

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -456,15 +456,29 @@ impl<'a> AstValidator<'a> {
         }
     }
 
-    fn check_foreign_item_safety(&self, item_span: Span, safety: Safety) {
-        if matches!(safety, Safety::Unsafe(_) | Safety::Safe(_))
-            && (self.extern_mod_safety == Some(Safety::Default)
-                || !self.features.unsafe_extern_blocks)
-        {
-            self.dcx().emit_err(errors::InvalidSafetyOnExtern {
-                item_span,
-                block: self.current_extern_span(),
-            });
+    fn check_item_safety(&self, span: Span, safety: Safety) {
+        match self.extern_mod_safety {
+            Some(extern_safety) => {
+                if matches!(safety, Safety::Unsafe(_) | Safety::Safe(_))
+                    && (extern_safety == Safety::Default || !self.features.unsafe_extern_blocks)
+                {
+                    self.dcx().emit_err(errors::InvalidSafetyOnExtern {
+                        item_span: span,
+                        block: self.current_extern_span(),
+                    });
+                }
+            }
+            None => {
+                if matches!(safety, Safety::Safe(_)) {
+                    self.dcx().emit_err(errors::InvalidSafetyOnItem { span });
+                }
+            }
+        }
+    }
+
+    fn check_bare_fn_safety(&self, span: Span, safety: Safety) {
+        if matches!(safety, Safety::Safe(_)) {
+            self.dcx().emit_err(errors::InvalidSafetyOnBareFn { span });
         }
     }
 
@@ -746,6 +760,7 @@ impl<'a> AstValidator<'a> {
     fn visit_ty_common(&mut self, ty: &'a Ty) {
         match &ty.kind {
             TyKind::BareFn(bfty) => {
+                self.check_bare_fn_safety(bfty.decl_span, bfty.safety);
                 self.check_fn_decl(&bfty.decl, SelfSemantic::No);
                 Self::check_decl_no_pat(&bfty.decl, |span, _, _| {
                     self.dcx().emit_err(errors::PatternFnPointer { span });
@@ -1174,11 +1189,15 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
                     });
                 }
             }
-            ItemKind::Static(box StaticItem { expr: None, .. }) => {
-                self.dcx().emit_err(errors::StaticWithoutBody {
-                    span: item.span,
-                    replace_span: self.ending_semi_or_hi(item.span),
-                });
+            ItemKind::Static(box StaticItem { expr, safety, .. }) => {
+                self.check_item_safety(item.span, *safety);
+
+                if expr.is_none() {
+                    self.dcx().emit_err(errors::StaticWithoutBody {
+                        span: item.span,
+                        replace_span: self.ending_semi_or_hi(item.span),
+                    });
+                }
             }
             ItemKind::TyAlias(
                 ty_alias @ box TyAlias { defaultness, bounds, where_clauses, ty, .. },
@@ -1212,7 +1231,6 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
     fn visit_foreign_item(&mut self, fi: &'a ForeignItem) {
         match &fi.kind {
             ForeignItemKind::Fn(box Fn { defaultness, sig, body, .. }) => {
-                self.check_foreign_item_safety(fi.span, sig.header.safety);
                 self.check_defaultness(fi.span, *defaultness);
                 self.check_foreign_fn_bodyless(fi.ident, body.as_deref());
                 self.check_foreign_fn_headerless(sig.header);
@@ -1233,7 +1251,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
                 self.check_foreign_item_ascii_only(fi.ident);
             }
             ForeignItemKind::Static(box StaticForeignItem { expr, safety, .. }) => {
-                self.check_foreign_item_safety(fi.span, *safety);
+                self.check_item_safety(fi.span, *safety);
                 self.check_foreign_kind_bodyless(fi.ident, "static", expr.as_ref().map(|b| b.span));
                 self.check_foreign_item_ascii_only(fi.ident);
             }
@@ -1453,6 +1471,10 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
         };
         self.check_fn_decl(fk.decl(), self_semantic);
 
+        if let Some(&FnHeader { safety, .. }) = fk.header() {
+            self.check_item_safety(span, safety);
+        }
+
         self.check_c_variadic_type(fk);
 
         // Functions cannot both be `const async` or `const gen`