Rollup merge of rust-lang#80527 - jyn514:rustdoc-lints, r=GuillaumeGomez

Make rustdoc lints a tool lint instead of built-in

- Rename `broken_intra_doc_links` to `rustdoc::broken_intra_doc_links` (and similar for other rustdoc lints; I don't expect any others to be used frequently, though).
- Ensure that the old lint names still work and give deprecation errors
- Register lints even when running doctests
- Move lint machinery into a separate file
- Add `declare_rustdoc_lint!` macro

Unblocks rust-lang#80300, rust-lang#79816, rust-lang#80965. Makes the strangeness in rust-lang#77364 more apparent to the end user (note that `missing_docs` is *not* moved to rustdoc in this PR). Closes rust-lang#78786.

## Current status

This is blocked on rust-lang#82620 (see rust-lang#80527 (comment))

compiler/rustc_ast/src/attr/mod.rs

@@ -34,7 +34,7 @@ impl MarkedAttrs {
 }
 
 pub fn is_known_lint_tool(m_item: Ident) -> bool {
-    [sym::clippy, sym::rustc].contains(&m_item.name)
+    [sym::clippy, sym::rustc, sym::rustdoc].contains(&m_item.name)
 }
 
 impl NestedMetaItem {

compiler/rustc_error_codes/src/lib.rs

@@ -1,4 +1,5 @@
-#![deny(invalid_codeblock_attributes)]
+#![cfg_attr(bootstrap, deny(invalid_codeblock_attributes))]
+#![cfg_attr(not(bootstrap), deny(rustdoc::invalid_codeblock_attributes))]
 //! This library is used to gather all error codes into one place,
 //! the goal being to make their maintenance easier.
 

compiler/rustc_lint/src/context.rs

@@ -89,6 +89,7 @@ impl SessionLintStore for LintStore {
 }
 
 /// The target of the `by_name` map, which accounts for renaming/deprecation.
+#[derive(Debug)]
 enum TargetLint {
     /// A direct lint target
     Id(LintId),
@@ -470,7 +471,10 @@ impl LintStore {
             Some(&Id(ref id)) => {
                 CheckLintNameResult::Tool(Err((Some(slice::from_ref(id)), complete_name)))
             }
-            _ => CheckLintNameResult::NoLint(None),
+            Some(other) => {
+                tracing::debug!("got renamed lint {:?}", other);
+                CheckLintNameResult::NoLint(None)
+            }
         }
     }
 }

compiler/rustc_lint/src/lib.rs

@@ -69,9 +69,7 @@ use rustc_hir::def_id::LocalDefId;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::lint::builtin::{
-    BARE_TRAIT_OBJECTS, BROKEN_INTRA_DOC_LINKS, ELIDED_LIFETIMES_IN_PATHS,
-    EXPLICIT_OUTLIVES_REQUIREMENTS, INVALID_CODEBLOCK_ATTRIBUTES, INVALID_HTML_TAGS,
-    MISSING_DOC_CODE_EXAMPLES, NON_AUTOLINKS, PRIVATE_DOC_TESTS,
+    BARE_TRAIT_OBJECTS, ELIDED_LIFETIMES_IN_PATHS, EXPLICIT_OUTLIVES_REQUIREMENTS,
 };
 use rustc_span::symbol::{Ident, Symbol};
 use rustc_span::Span;
@@ -314,17 +312,6 @@ fn register_builtins(store: &mut LintStore, no_interleave_lints: bool) {
                                        // MACRO_USE_EXTERN_CRATE
     );
 
-    add_lint_group!(
-        "rustdoc",
-        NON_AUTOLINKS,
-        BROKEN_INTRA_DOC_LINKS,
-        PRIVATE_INTRA_DOC_LINKS,
-        INVALID_CODEBLOCK_ATTRIBUTES,
-        MISSING_DOC_CODE_EXAMPLES,
-        PRIVATE_DOC_TESTS,
-        INVALID_HTML_TAGS
-    );
-
     // Register renamed and removed lints.
     store.register_renamed("single_use_lifetime", "single_use_lifetimes");
     store.register_renamed("elided_lifetime_in_path", "elided_lifetimes_in_paths");
@@ -334,8 +321,29 @@ fn register_builtins(store: &mut LintStore, no_interleave_lints: bool) {
     store.register_renamed("async_idents", "keyword_idents");
     store.register_renamed("exceeding_bitshifts", "arithmetic_overflow");
     store.register_renamed("redundant_semicolon", "redundant_semicolons");
-    store.register_renamed("intra_doc_link_resolution_failure", "broken_intra_doc_links");
     store.register_renamed("overlapping_patterns", "overlapping_range_endpoints");
+
+    // These were moved to tool lints, but rustc still sees them when compiling normally, before
+    // tool lints are registered, so `check_tool_name_for_backwards_compat` doesn't work. Use
+    // `register_removed` explicitly.
+    const RUSTDOC_LINTS: &[&str] = &[
+        "broken_intra_doc_links",
+        "private_intra_doc_links",
+        "missing_crate_level_docs",
+        "missing_doc_code_examples",
+        "private_doc_tests",
+        "invalid_codeblock_attributes",
+        "invalid_html_tags",
+        "non_autolinks",
+    ];
+    for rustdoc_lint in RUSTDOC_LINTS {
+        store.register_removed(rustdoc_lint, &format!("use `rustdoc::{}` instead", rustdoc_lint));
+    }
+    store.register_removed(
+        "intra_doc_link_resolution_failure",
+        "use `rustdoc::broken_intra_doc_links` instead",
+    );
+
     store.register_removed("unknown_features", "replaced by an error");
     store.register_removed("unsigned_negation", "replaced by negate_unsigned feature gate");
     store.register_removed("negate_unsigned", "cast a signed value instead");

compiler/rustc_lint_defs/src/builtin.rs

@@ -1875,93 +1875,6 @@ declare_lint! {
     "detects labels that are never used"
 }
 
-declare_lint! {
-    /// The `broken_intra_doc_links` lint detects failures in resolving
-    /// intra-doc link targets. This is a `rustdoc` only lint, see the
-    /// documentation in the [rustdoc book].
-    ///
-    /// [rustdoc book]: ../../../rustdoc/lints.html#broken_intra_doc_links
-    pub BROKEN_INTRA_DOC_LINKS,
-    Warn,
-    "failures in resolving intra-doc link targets"
-}
-
-declare_lint! {
-    /// This is a subset of `broken_intra_doc_links` that warns when linking from
-    /// a public item to a private one. This is a `rustdoc` only lint, see the
-    /// documentation in the [rustdoc book].
-    ///
-    /// [rustdoc book]: ../../../rustdoc/lints.html#private_intra_doc_links
-    pub PRIVATE_INTRA_DOC_LINKS,
-    Warn,
-    "linking from a public item to a private one"
-}
-
-declare_lint! {
-    /// The `invalid_codeblock_attributes` lint detects code block attributes
-    /// in documentation examples that have potentially mis-typed values. This
-    /// is a `rustdoc` only lint, see the documentation in the [rustdoc book].
-    ///
-    /// [rustdoc book]: ../../../rustdoc/lints.html#invalid_codeblock_attributes
-    pub INVALID_CODEBLOCK_ATTRIBUTES,
-    Warn,
-    "codeblock attribute looks a lot like a known one"
-}
-
-declare_lint! {
-    /// The `missing_crate_level_docs` lint detects if documentation is
-    /// missing at the crate root. This is a `rustdoc` only lint, see the
-    /// documentation in the [rustdoc book].
-    ///
-    /// [rustdoc book]: ../../../rustdoc/lints.html#missing_crate_level_docs
-    pub MISSING_CRATE_LEVEL_DOCS,
-    Allow,
-    "detects crates with no crate-level documentation"
-}
-
-declare_lint! {
-    /// The `missing_doc_code_examples` lint detects publicly-exported items
-    /// without code samples in their documentation. This is a `rustdoc` only
-    /// lint, see the documentation in the [rustdoc book].
-    ///
-    /// [rustdoc book]: ../../../rustdoc/lints.html#missing_doc_code_examples
-    pub MISSING_DOC_CODE_EXAMPLES,
-    Allow,
-    "detects publicly-exported items without code samples in their documentation"
-}
-
-declare_lint! {
-    /// The `private_doc_tests` lint detects code samples in docs of private
-    /// items not documented by `rustdoc`. This is a `rustdoc` only lint, see
-    /// the documentation in the [rustdoc book].
-    ///
-    /// [rustdoc book]: ../../../rustdoc/lints.html#private_doc_tests
-    pub PRIVATE_DOC_TESTS,
-    Allow,
-    "detects code samples in docs of private items not documented by rustdoc"
-}
-
-declare_lint! {
-    /// The `invalid_html_tags` lint detects invalid HTML tags. This is a
-    /// `rustdoc` only lint, see the documentation in the [rustdoc book].
-    ///
-    /// [rustdoc book]: ../../../rustdoc/lints.html#invalid_html_tags
-    pub INVALID_HTML_TAGS,
-    Allow,
-    "detects invalid HTML tags in doc comments"
-}
-
-declare_lint! {
-    /// The `non_autolinks` lint detects when a URL could be written using
-    /// only angle brackets. This is a `rustdoc` only lint, see the
-    /// documentation in the [rustdoc book].
-    ///
-    /// [rustdoc book]: ../../../rustdoc/lints.html#non_autolinks
-    pub NON_AUTOLINKS,
-    Warn,
-    "detects URLs that could be written using only angle brackets"
-}
-
 declare_lint! {
     /// The `where_clauses_object_safety` lint detects for [object safety] of
     /// [where clauses].
@@ -3020,14 +2933,6 @@ declare_lint_pass! {
         ABSOLUTE_PATHS_NOT_STARTING_WITH_CRATE,
         UNSTABLE_NAME_COLLISIONS,
         IRREFUTABLE_LET_PATTERNS,
-        BROKEN_INTRA_DOC_LINKS,
-        PRIVATE_INTRA_DOC_LINKS,
-        INVALID_CODEBLOCK_ATTRIBUTES,
-        MISSING_CRATE_LEVEL_DOCS,
-        MISSING_DOC_CODE_EXAMPLES,
-        INVALID_HTML_TAGS,
-        PRIVATE_DOC_TESTS,
-        NON_AUTOLINKS,
         WHERE_CLAUSES_OBJECT_SAFETY,
         PROC_MACRO_DERIVE_RESOLUTION_FALLBACK,
         MACRO_USE_EXTERN_CRATE,

compiler/rustc_span/src/symbol.rs

@@ -1021,6 +1021,7 @@ symbols! {
         rustc_then_this_would_need,
         rustc_unsafe_specialization_marker,
         rustc_variance,
+        rustdoc,
         rustfmt,
         rvalue_static_promotion,
         sanitize,

library/core/src/lib.rs

@@ -297,7 +297,8 @@ pub mod primitive;
     unused_imports,
     unsafe_op_in_unsafe_fn
 )]
-#[allow(non_autolinks)]
+#[cfg_attr(bootstrap, allow(non_autolinks))]
+#[cfg_attr(not(bootstrap), allow(rustdoc::non_autolinks))]
 // FIXME: This annotation should be moved into rust-lang/stdarch after clashing_extern_declarations is
 // merged. It currently cannot because bootstrap fails as the lint hasn't been defined yet.
 #[allow(clashing_extern_declarations)]

src/bootstrap/builder.rs

@@ -735,8 +735,15 @@ impl<'a> Builder<'a> {
             .env("RUSTDOC_LIBDIR", self.rustc_libdir(compiler))
             .env("CFG_RELEASE_CHANNEL", &self.config.channel)
             .env("RUSTDOC_REAL", self.rustdoc(compiler))
-            .env("RUSTC_BOOTSTRAP", "1")
-            .arg("-Winvalid_codeblock_attributes");
+            .env("RUSTC_BOOTSTRAP", "1");
+
+        // cfg(bootstrap), can be removed on the next beta bump
+        if compiler.stage == 0 {
+            cmd.arg("-Winvalid_codeblock_attributes");
+        } else {
+            cmd.arg("-Wrustdoc::invalid_codeblock_attributes");
+        }
+
         if self.config.deny_warnings {
             cmd.arg("-Dwarnings");
         }
@@ -1292,7 +1299,12 @@ impl<'a> Builder<'a> {
             // fixed via better support from Cargo.
             cargo.env("RUSTC_LINT_FLAGS", lint_flags.join(" "));
 
-            rustdocflags.arg("-Winvalid_codeblock_attributes");
+            // cfg(bootstrap), can be removed on the next beta bump
+            if compiler.stage == 0 {
+                rustdocflags.arg("-Winvalid_codeblock_attributes");
+            } else {
+                rustdocflags.arg("-Wrustdoc::invalid_codeblock_attributes");
+            }
         }
 
         if mode == Mode::Rustc {

src/doc/rustdoc/src/lints.md

@@ -4,12 +4,13 @@
 can use them like any other lints by doing this:
 
 ```rust
-#![allow(missing_docs)] // allows the lint, no diagnostics will be reported
-#![warn(missing_docs)] // warn if there are missing docs
-#![deny(missing_docs)] // error if there are missing docs
-# //! Crate docs.
+#![allow(rustdoc::broken_intra_doc_links)] // allows the lint, no diagnostics will be reported
+#![warn(rustdoc::broken_intra_doc_links)] // warn if there are broken intra-doc links
+#![deny(rustdoc::broken_intra_doc_links)] // error if there are broken intra-doc links
 ```
 
+Note that, except for `missing_docs`, these lints are only available when running `rustdoc`, not `rustc`.
+
 Here is the list of the lints provided by `rustdoc`:
 
 ## broken_intra_doc_links
@@ -51,7 +52,7 @@ warning: `Foo` is both an enum and a function
 1 | /// [`Foo`]
   |      ^^^^^ ambiguous link
   |
-  = note: `#[warn(broken_intra_doc_links)]` on by default
+  = note: `#[warn(rustdoc::broken_intra_doc_links)]` on by default
 help: to link to the enum, prefix with the item type
   |
 1 | /// [`enum@Foo`]
@@ -83,7 +84,7 @@ warning: public documentation for `public` links to private item `private`
 1 | /// [private]
   |      ^^^^^^^ this item is private
   |
-  = note: `#[warn(private_intra_doc_links)]` on by default
+  = note: `#[warn(rustdoc::private_intra_doc_links)]` on by default
   = note: this link will resolve properly if you pass `--document-private-items`
 ```
 
@@ -97,7 +98,7 @@ warning: public documentation for `public` links to private item `private`
 1 | /// [private]
   |      ^^^^^^^ this item is private
   |
-  = note: `#[warn(private_intra_doc_links)]` on by default
+  = note: `#[warn(rustdoc::private_intra_doc_links)]` on by default
   = note: this link resolves only because you passed `--document-private-items`, but will break without
 ```
 
@@ -125,13 +126,15 @@ warning: missing documentation for a function
    | ^^^^^^^^^^^^^^^^^^^^^
 ```
 
+Note that unlike other rustdoc lints, this lint is also available from `rustc` directly.
+
 ## missing_crate_level_docs
 
 This lint is **allowed by default**. It detects if there is no documentation
 at the crate root. For example:
 
 ```rust
-#![warn(missing_crate_level_docs)]
+#![warn(rustdoc::missing_crate_level_docs)]
 ```
 
 This will generate the following warning:
@@ -155,7 +158,7 @@ This lint is **allowed by default** and is **nightly-only**. It detects when a d
 is missing a code example. For example:
 
 ```rust
-#![warn(missing_doc_code_examples)]
+#![warn(rustdoc::missing_doc_code_examples)]
 
 /// There is no code example!
 pub fn no_code_example() {}
@@ -191,7 +194,7 @@ This lint is **allowed by default**. It detects documentation tests when they
 are on a private item. For example:
 
 ```rust
-#![warn(private_doc_tests)]
+#![warn(rustdoc::private_doc_tests)]
 
 mod foo {
     /// private doc test
@@ -245,7 +248,7 @@ warning: unknown attribute `should-panic`. Did you mean `should_panic`?
 5 | | /// ```
   | |_______^
   |
-  = note: `#[warn(invalid_codeblock_attributes)]` on by default
+  = note: `#[warn(rustdoc::invalid_codeblock_attributes)]` on by default
   = help: the code block will either not be tested if not marked as a rust one or won't fail if it doesn't panic when running
 ```
 
@@ -258,7 +261,7 @@ This lint is **allowed by default** and is **nightly-only**. It detects unclosed
 or invalid HTML tags. For example:
 
 ```rust
-#![warn(invalid_html_tags)]
+#![warn(rustdoc::invalid_html_tags)]
 
 /// <h1>
 /// </script>
@@ -275,7 +278,11 @@ warning: unopened HTML tag `script`
 2 | | /// </script>
   | |_____________^
   |
-  = note: `#[warn(invalid_html_tags)]` on by default
+  note: the lint level is defined here
+ --> foo.rs:1:9
+  |
+1 | #![warn(rustdoc::invalid_html_tags)]
+  |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 warning: unclosed HTML tag `h1`
  --> foo.rs:1:1
@@ -310,7 +317,7 @@ warning: this URL is not a hyperlink
 1 | /// http://example.org
   |     ^^^^^^^^^^^^^^^^^^ help: use an automatic link instead: `<http://example.org>`
   |
-  = note: `#[warn(non_autolinks)]` on by default
+  = note: `#[warn(rustdoc::non_autolinks)]` on by default
 
 warning: unneeded long form for URL
  --> foo.rs:2:5