Auto merge of rust-lang#83432 - Dylan-DPC:rollup-4z5f6al, r=Dylan-DPC

Rollup of 9 pull requests

Successful merges:

 - rust-lang#83051 (Sidebar trait items order)
 - rust-lang#83313 (Only enable assert_dep_graph when query-dep-graph is enabled.)
 - rust-lang#83353 (Add internal io::Error::new_const to avoid allocations.)
 - rust-lang#83391 (Allow not emitting `uwtable` on Android)
 - rust-lang#83392 (Change `-W help` to display edition level.)
 - rust-lang#83393 (Codeblock tooltip position)
 - rust-lang#83399 (rustdoc: Record crate name instead of using `None`)
 - rust-lang#83405 (Slight visual improvements to warning boxes in the docs)
 - rust-lang#83415 (Remove unnecessary `Option` wrapping around `Crate.module`)

Failed merges:

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

Author: bors

compiler/rustc_driver/src/lib.rs

@@ -895,7 +895,12 @@ Available lint options:
     let print_lints = |lints: Vec<&Lint>| {
         for lint in lints {
             let name = lint.name_lower().replace("_", "-");
-            println!("    {}  {:7.7}  {}", padded(&name), lint.default_level.as_str(), lint.desc);
+            println!(
+                "    {}  {:7.7}  {}",
+                padded(&name),
+                lint.default_level(sess.edition()).as_str(),
+                lint.desc
+            );
         }
         println!("\n");
     };

compiler/rustc_incremental/src/assert_dep_graph.rs

@@ -57,6 +57,10 @@ pub fn assert_dep_graph(tcx: TyCtxt<'_>) {
             dump_graph(tcx);
         }
 
+        if !tcx.sess.opts.debugging_opts.query_dep_graph {
+            return;
+        }
+
         // if the `rustc_attrs` feature is not enabled, then the
         // attributes we are interested in cannot be present anyway, so
         // skip the walk.

compiler/rustc_incremental/src/persist/dirty_clean.rs

@@ -148,6 +148,10 @@ impl Assertion {
 }
 
 pub fn check_dirty_clean_annotations(tcx: TyCtxt<'_>) {
+    if !tcx.sess.opts.debugging_opts.query_dep_graph {
+        return;
+    }
+
     // can't add `#[rustc_dirty]` etc without opting in to this feature
     if !tcx.features().rustc_attrs {
         return;

compiler/rustc_passes/src/check_attr.rs

@@ -99,6 +99,12 @@ impl CheckAttrVisitor<'tcx> {
                 self.check_naked(hir_id, attr, span, target)
             } else if self.tcx.sess.check_name(attr, sym::rustc_legacy_const_generics) {
                 self.check_rustc_legacy_const_generics(&attr, span, target, item)
+            } else if self.tcx.sess.check_name(attr, sym::rustc_clean)
+                || self.tcx.sess.check_name(attr, sym::rustc_dirty)
+                || self.tcx.sess.check_name(attr, sym::rustc_if_this_changed)
+                || self.tcx.sess.check_name(attr, sym::rustc_then_this_would_need)
+            {
+                self.check_rustc_dirty_clean(&attr)
             } else {
                 // lint-only checks
                 if self.tcx.sess.check_name(attr, sym::cold) {
@@ -1012,6 +1018,20 @@ impl CheckAttrVisitor<'tcx> {
         }
     }
 
+    /// Checks that the dep-graph debugging attributes are only present when the query-dep-graph
+    /// option is passed to the compiler.
+    fn check_rustc_dirty_clean(&self, attr: &Attribute) -> bool {
+        if self.tcx.sess.opts.debugging_opts.query_dep_graph {
+            true
+        } else {
+            self.tcx
+                .sess
+                .struct_span_err(attr.span, "attribute requires -Z query-dep-graph to be enabled")
+                .emit();
+            false
+        }
+    }
+
     /// Checks if `#[link_section]` is applied to a function or static.
     fn check_link_section(&self, hir_id: HirId, attr: &Attribute, span: &Span, target: Target) {
         match target {

compiler/rustc_session/src/session.rs

@@ -863,7 +863,7 @@ impl Session {
         } else if self.target.requires_uwtable {
             true
         } else {
-            self.opts.cg.force_unwind_tables.unwrap_or(false)
+            self.opts.cg.force_unwind_tables.unwrap_or(self.target.default_uwtable)
         }
     }
 

compiler/rustc_target/src/spec/android_base.rs

@@ -12,7 +12,10 @@ pub fn opts() -> TargetOptions {
     base.dwarf_version = Some(2);
     base.position_independent_executables = true;
     base.has_elf_tls = false;
-    base.requires_uwtable = true;
+    // This is for backward compatibility, see https://github.com/rust-lang/rust/issues/49867
+    // for context. (At that time, there was no `-C force-unwind-tables`, so the only solution
+    // was to always emit `uwtable`).
+    base.default_uwtable = true;
     base.crt_static_respected = false;
     base
 }

compiler/rustc_target/src/spec/mod.rs

@@ -1111,6 +1111,10 @@ pub struct TargetOptions {
     /// unwinders.
     pub requires_uwtable: bool,
 
+    /// Whether or not to emit `uwtable` attributes on functions if `-C force-unwind-tables`
+    /// is not specified and `uwtable` is not required on this target.
+    pub default_uwtable: bool,
+
     /// Whether or not SIMD types are passed by reference in the Rust ABI,
     /// typically required if a target can be compiled with a mixed set of
     /// target features. This is `true` by default, and `false` for targets like
@@ -1248,6 +1252,7 @@ impl Default for TargetOptions {
             default_hidden_visibility: false,
             emit_debug_gdb_scripts: true,
             requires_uwtable: false,
+            default_uwtable: false,
             simd_types_indirect: true,
             limit_rdylib_exports: true,
             override_export_symbols: None,
@@ -1711,6 +1716,7 @@ impl Target {
         key!(default_hidden_visibility, bool);
         key!(emit_debug_gdb_scripts, bool);
         key!(requires_uwtable, bool);
+        key!(default_uwtable, bool);
         key!(simd_types_indirect, bool);
         key!(limit_rdylib_exports, bool);
         key!(override_export_symbols, opt_list);
@@ -1947,6 +1953,7 @@ impl ToJson for Target {
         target_option_val!(default_hidden_visibility);
         target_option_val!(emit_debug_gdb_scripts);
         target_option_val!(requires_uwtable);
+        target_option_val!(default_uwtable);
         target_option_val!(simd_types_indirect);
         target_option_val!(limit_rdylib_exports);
         target_option_val!(override_export_symbols);

library/std/src/ffi/c_str.rs

@@ -1036,7 +1036,7 @@ impl fmt::Display for NulError {
 impl From<NulError> for io::Error {
     /// Converts a [`NulError`] into a [`io::Error`].
     fn from(_: NulError) -> io::Error {
-        io::Error::new(io::ErrorKind::InvalidInput, "data provided contains a nul byte")
+        io::Error::new_const(io::ErrorKind::InvalidInput, &"data provided contains a nul byte")
     }
 }
 

library/std/src/fs.rs

@@ -2188,7 +2188,10 @@ impl DirBuilder {
         match path.parent() {
             Some(p) => self.create_dir_all(p)?,
             None => {
-                return Err(io::Error::new(io::ErrorKind::Other, "failed to create whole tree"));
+                return Err(io::Error::new_const(
+                    io::ErrorKind::Other,
+                    &"failed to create whole tree",
+                ));
             }
         }
         match self.inner.mkdir(path) {

library/std/src/io/buffered/bufwriter.rs

@@ -164,9 +164,9 @@ impl<W: Write> BufWriter<W> {
 
             match r {
                 Ok(0) => {
-                    return Err(Error::new(
+                    return Err(Error::new_const(
                         ErrorKind::WriteZero,
-                        "failed to write the buffered data",
+                        &"failed to write the buffered data",
                     ));
                 }
                 Ok(n) => guard.consume(n),