Rollup of 5 pull requests

compiler/rustc_codegen_llvm/src/back/lto.rs

@@ -25,6 +25,7 @@ use std::ffi::{CStr, CString};
 use std::fs::File;
 use std::io;
 use std::iter;
+use std::mem::ManuallyDrop;
 use std::path::Path;
 use std::slice;
 use std::sync::Arc;
@@ -734,7 +735,7 @@ pub unsafe fn optimize_thin_module(
     let llcx = llvm::LLVMRustContextCreate(cgcx.fewer_names);
     let llmod_raw = parse_module(llcx, module_name, thin_module.data(), &diag_handler)? as *const _;
     let mut module = ModuleCodegen {
-        module_llvm: ModuleLlvm { llmod_raw, llcx, tm },
+        module_llvm: ModuleLlvm { llmod_raw, llcx, tm: ManuallyDrop::new(tm) },
         name: thin_module.name().to_string(),
         kind: ModuleKind::Regular,
     };

compiler/rustc_codegen_llvm/src/lib.rs

@@ -52,6 +52,7 @@ use rustc_span::symbol::Symbol;
 use std::any::Any;
 use std::ffi::CStr;
 use std::io::Write;
+use std::mem::ManuallyDrop;
 
 mod back {
     pub mod archive;
@@ -407,8 +408,9 @@ pub struct ModuleLlvm {
     llcx: &'static mut llvm::Context,
     llmod_raw: *const llvm::Module,
 
-    // independent from llcx and llmod_raw, resources get disposed by drop impl
-    tm: OwnedTargetMachine,
+    // This field is `ManuallyDrop` because it is important that the `TargetMachine`
+    // is disposed prior to the `Context` being disposed otherwise UAFs can occur.
+    tm: ManuallyDrop<OwnedTargetMachine>,
 }
 
 unsafe impl Send for ModuleLlvm {}
@@ -419,15 +421,23 @@ impl ModuleLlvm {
         unsafe {
             let llcx = llvm::LLVMRustContextCreate(tcx.sess.fewer_names());
             let llmod_raw = context::create_module(tcx, llcx, mod_name) as *const _;
-            ModuleLlvm { llmod_raw, llcx, tm: create_target_machine(tcx, mod_name) }
+            ModuleLlvm {
+                llmod_raw,
+                llcx,
+                tm: ManuallyDrop::new(create_target_machine(tcx, mod_name)),
+            }
         }
     }
 
     fn new_metadata(tcx: TyCtxt<'_>, mod_name: &str) -> Self {
         unsafe {
             let llcx = llvm::LLVMRustContextCreate(tcx.sess.fewer_names());
             let llmod_raw = context::create_module(tcx, llcx, mod_name) as *const _;
-            ModuleLlvm { llmod_raw, llcx, tm: create_informational_target_machine(tcx.sess) }
+            ModuleLlvm {
+                llmod_raw,
+                llcx,
+                tm: ManuallyDrop::new(create_informational_target_machine(tcx.sess)),
+            }
         }
     }
 
@@ -448,7 +458,7 @@ impl ModuleLlvm {
                 }
             };
 
-            Ok(ModuleLlvm { llmod_raw, llcx, tm })
+            Ok(ModuleLlvm { llmod_raw, llcx, tm: ManuallyDrop::new(tm) })
         }
     }
 
@@ -460,6 +470,7 @@ impl ModuleLlvm {
 impl Drop for ModuleLlvm {
     fn drop(&mut self) {
         unsafe {
+            ManuallyDrop::drop(&mut self.tm);
             llvm::LLVMContextDispose(&mut *(self.llcx as *mut _));
         }
     }

compiler/rustc_hir_typeck/src/expr.rs

@@ -2090,7 +2090,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 [] => unreachable!(),
             };
             err.note(format!(
-                "... and other private field{s} {names}that {were} not provided",
+                "{}private field{s} {names}that {were} not provided",
+                if used_fields.is_empty() { "" } else { "...and other " },
                 s = pluralize!(remaining_private_fields_len),
                 were = pluralize!("was", remaining_private_fields_len),
             ));

compiler/rustc_span/src/symbol.rs

@@ -128,13 +128,11 @@ symbols! {
         AcqRel,
         Acquire,
         AddToDiagnostic,
-        Alignment,
         Any,
         Arc,
         ArcWeak,
         Argument,
         ArgumentMethods,
-        Arguments,
         ArrayIntoIter,
         AsMut,
         AsRef,
@@ -164,7 +162,6 @@ symbols! {
         Break,
         C,
         CStr,
-        CString,
         Capture,
         Center,
         Cleanup,
@@ -174,7 +171,6 @@ symbols! {
         Context,
         Continue,
         Copy,
-        Count,
         Cow,
         Debug,
         DebugStruct,
@@ -199,7 +195,6 @@ symbols! {
         Fn,
         FnMut,
         FnOnce,
-        FormatSpec,
         Formatter,
         From,
         FromIterator,
@@ -208,8 +203,6 @@ symbols! {
         FsPermissions,
         Future,
         FutureOutput,
-        FxHashMap,
-        FxHashSet,
         GlobalAlloc,
         Hash,
         HashMap,
@@ -253,7 +246,6 @@ symbols! {
         NonZeroI32,
         NonZeroI64,
         NonZeroI8,
-        NonZeroIsize,
         NonZeroU128,
         NonZeroU16,
         NonZeroU32,
@@ -275,7 +267,6 @@ symbols! {
         Path,
         PathBuf,
         Pending,
-        Pin,
         Pointer,
         Poll,
         ProcMacro,
@@ -333,7 +324,6 @@ symbols! {
         TyCtxt,
         TyKind,
         Unknown,
-        UnsafeArg,
         Vec,
         VecDeque,
         Wrapper,
@@ -389,7 +379,6 @@ symbols! {
         allow_fail,
         allow_internal_unsafe,
         allow_internal_unstable,
-        allowed,
         alu32,
         always,
         and,
@@ -405,8 +394,6 @@ symbols! {
         arm,
         arm_target_feature,
         array,
-        arrays,
-        as_mut_ptr,
         as_ptr,
         as_ref,
         as_str,
@@ -589,7 +576,6 @@ symbols! {
         const_try,
         constant,
         constructor,
-        context,
         convert_identity,
         copy,
         copy_closures,
@@ -776,8 +762,6 @@ symbols! {
         field,
         field_init_shorthand,
         file,
-        fill,
-        flags,
         float,
         float_to_int_unchecked,
         floorf32,
@@ -1059,7 +1043,6 @@ symbols! {
         mir_unwind_unreachable,
         mir_variant,
         miri,
-        misc,
         mmx_reg,
         modifiers,
         module,
@@ -1157,9 +1140,7 @@ symbols! {
         omit_gdb_pretty_printer_section,
         on,
         on_unimplemented,
-        oom,
         opaque,
-        ops,
         opt_out_copy,
         optimize,
         optimize_attribute,
@@ -1217,7 +1198,6 @@ symbols! {
         pointer,
         pointer_like,
         poll,
-        position,
         post_dash_lto: "post-lto",
         powerpc_target_feature,
         powf32,
@@ -1226,7 +1206,6 @@ symbols! {
         powif64,
         pre_dash_lto: "pre-lto",
         precise_pointer_size_matching,
-        precision,
         pref_align_of,
         prefetch_read_data,
         prefetch_read_instruction,
@@ -1236,7 +1215,6 @@ symbols! {
         prelude,
         prelude_import,
         preserves_flags,
-        primitive,
         print_macro,
         println_macro,
         proc_dash_macro: "proc-macro",
@@ -1260,7 +1238,6 @@ symbols! {
         ptr_const_is_null,
         ptr_copy,
         ptr_copy_nonoverlapping,
-        ptr_drop_in_place,
         ptr_eq,
         ptr_from_ref,
         ptr_guaranteed_cmp,
@@ -1622,7 +1599,6 @@ symbols! {
         structural_match,
         structural_peq,
         structural_teq,
-        sty,
         sub,
         sub_assign,
         sub_with_overflow,
@@ -1744,7 +1720,6 @@ symbols! {
         unrestricted_attribute_tokens,
         unsafe_block_in_unsafe_fn,
         unsafe_cell,
-        unsafe_cell_from_mut,
         unsafe_cell_raw_get,
         unsafe_no_drop_flag,
         unsafe_pin_internals,
@@ -1769,7 +1744,6 @@ symbols! {
         used_with_arg,
         using,
         usize,
-        v1,
         va_arg,
         va_copy,
         va_end,
@@ -1801,7 +1775,6 @@ symbols! {
         wasm_import_module,
         wasm_target_feature,
         while_let,
-        width,
         windows,
         windows_subsystem,
         with_negative_coherence,

src/librustdoc/html/render/mod.rs

@@ -1145,7 +1145,7 @@ impl<'a> AssocItemLink<'a> {
 fn write_impl_section_heading(mut w: impl fmt::Write, title: &str, id: &str) {
     write!(
         w,
-        "<h2 id=\"{id}\" class=\"small-section-header\">\
+        "<h2 id=\"{id}\" class=\"section-header\">\
             {title}\
             <a href=\"#{id}\" class=\"anchor\">§</a>\
          </h2>"

src/librustdoc/html/render/print_item.rs

@@ -430,7 +430,7 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
             last_section = Some(my_section);
             write!(
                 w,
-                "<h2 id=\"{id}\" class=\"small-section-header\">\
+                "<h2 id=\"{id}\" class=\"section-header\">\
                     <a href=\"#{id}\">{name}</a>\
                  </h2>{ITEM_TABLE_OPEN}",
                 id = cx.derive_id(my_section.id()),
@@ -827,7 +827,7 @@ fn item_trait(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, t: &clean:
     fn write_small_section_header(w: &mut Buffer, id: &str, title: &str, extra_content: &str) {
         write!(
             w,
-            "<h2 id=\"{0}\" class=\"small-section-header\">\
+            "<h2 id=\"{0}\" class=\"section-header\">\
                 {1}<a href=\"#{0}\" class=\"anchor\">§</a>\
              </h2>{2}",
             id, title, extra_content
@@ -1260,7 +1260,7 @@ fn item_type_alias(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, t: &c
     if let Some(inner_type) = &t.inner_type {
         write!(
             w,
-            "<h2 id=\"aliased-type\" class=\"small-section-header\">\
+            "<h2 id=\"aliased-type\" class=\"section-header\">\
                 Aliased Type<a href=\"#aliased-type\" class=\"anchor\">§</a></h2>"
         );
 
@@ -1685,7 +1685,7 @@ fn item_variants(
     let tcx = cx.tcx();
     write!(
         w,
-        "<h2 id=\"variants\" class=\"variants small-section-header\">\
+        "<h2 id=\"variants\" class=\"variants section-header\">\
             Variants{}<a href=\"#variants\" class=\"anchor\">§</a>\
         </h2>\
         {}\
@@ -1772,7 +1772,7 @@ fn item_variants(
                         write!(
                             w,
                             "<div class=\"sub-variant-field\">\
-                                 <span id=\"{id}\" class=\"small-section-header\">\
+                                 <span id=\"{id}\" class=\"section-header\">\
                                      <a href=\"#{id}\" class=\"anchor field\">§</a>\
                                      <code>{f}: {t}</code>\
                                  </span>",
@@ -1929,7 +1929,7 @@ fn item_fields(
         if fields.peek().is_some() {
             write!(
                 w,
-                "<h2 id=\"fields\" class=\"fields small-section-header\">\
+                "<h2 id=\"fields\" class=\"fields section-header\">\
                      {}{}<a href=\"#fields\" class=\"anchor\">§</a>\
                  </h2>\
                  {}",
@@ -1943,7 +1943,7 @@ fn item_fields(
                 let id = cx.derive_id(format!("{typ}.{field_name}", typ = ItemType::StructField));
                 write!(
                     w,
-                    "<span id=\"{id}\" class=\"{item_type} small-section-header\">\
+                    "<span id=\"{id}\" class=\"{item_type} section-header\">\
                          <a href=\"#{id}\" class=\"anchor field\">§</a>\
                          <code>{field_name}: {ty}</code>\
                      </span>",

src/librustdoc/html/static/css/rustdoc.css

@@ -205,7 +205,7 @@ ul.all-items {
 
 #toggle-all-docs,
 a.anchor,
-.small-section-header a,
+.section-header a,
 #src-sidebar a,
 .rust a,
 .sidebar h2 a,
@@ -742,13 +742,13 @@ nav.sub {
 	margin: 0 0 15px 0;
 }
 
-.small-section-header {
+.section-header {
 	/* fields use <span> tags, but should get their own lines */
 	display: block;
 	position: relative;
 }
 
-.small-section-header:hover > .anchor, .impl:hover > .anchor,
+.section-header:hover > .anchor, .impl:hover > .anchor,
 .trait-impl:hover > .anchor, .variant:hover > .anchor {
 	display: initial;
 }
@@ -761,11 +761,11 @@ nav.sub {
 .anchor.field {
 	left: -5px;
 }
-.small-section-header > .anchor {
+.section-header > .anchor {
 	left: -15px;
 	padding-right: 8px;
 }
-h2.small-section-header > .anchor {
+h2.section-header > .anchor {
 	padding-right: 6px;
 }