Rollup of 6 pull requests

.mailmap

@@ -286,7 +286,7 @@ Xuefeng Wu <[email protected]> Xuefeng Wu <[email protected]>
 Xuefeng Wu <[email protected]> XuefengWu <[email protected]>
 York Xiang <[email protected]>
 Youngsoo Son <[email protected]> <[email protected]>
-Yuki Okushi <[email protected]>
+Yuki Okushi <[email protected]> <[email protected]>
 Zach Pomerantz <[email protected]>
 Zack Corr <[email protected]> <[email protected]>
 Zack Slayton <[email protected]>

compiler/rustc_mir/src/borrow_check/type_check/input_output.rs

@@ -70,6 +70,12 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
 
         // Equate expected input tys with those in the MIR.
         for (argument_index, &normalized_input_ty) in normalized_input_tys.iter().enumerate() {
+            if argument_index + 1 >= body.local_decls.len() {
+                self.tcx()
+                    .sess
+                    .delay_span_bug(body.span, "found more normalized_input_ty than local_decls");
+                break;
+            }
             // In MIR, argument N is stored in local N+1.
             let local = Local::new(argument_index + 1);
 

library/std/src/sync/once.rs

@@ -471,7 +471,7 @@ fn wait(state_and_queue: &AtomicUsize, mut current_state: usize) {
             // If the managing thread happens to signal and unpark us before we
             // can park ourselves, the result could be this thread never gets
             // unparked. Luckily `park` comes with the guarantee that if it got
-            // an `unpark` just before on an unparked thread is does not park.
+            // an `unpark` just before on an unparked thread it does not park.
             thread::park();
         }
         break;

library/std/src/sys/unix/thread.rs

@@ -343,6 +343,20 @@ pub mod guard {
             // it can eventually grow to. It cannot be used to determine
             // the position of kernel's stack guard.
             None
+        } else if cfg!(target_os = "freebsd") {
+            // FreeBSD's stack autogrows, and optionally includes a guard page
+            // at the bottom.  If we try to remap the bottom of the stack
+            // ourselves, FreeBSD's guard page moves upwards.  So we'll just use
+            // the builtin guard page.
+            let stackaddr = get_stack_start_aligned()?;
+            let guardaddr = stackaddr as usize;
+            // Technically the number of guard pages is tunable and controlled
+            // by the security.bsd.stack_guard_page sysctl, but there are
+            // few reasons to change it from the default.  The default value has
+            // been 1 ever since FreeBSD 11.1 and 10.4.
+            const GUARD_PAGES: usize = 1;
+            let guard = guardaddr..guardaddr + GUARD_PAGES * page_size;
+            Some(guard)
         } else {
             // Reallocate the last page of the stack.
             // This ensures SIGBUS will be raised on
@@ -371,9 +385,8 @@ pub mod guard {
             }
 
             let guardaddr = stackaddr as usize;
-            let offset = if cfg!(target_os = "freebsd") { 2 } else { 1 };
 
-            Some(guardaddr..guardaddr + offset * page_size)
+            Some(guardaddr..guardaddr + page_size)
         }
     }
 
@@ -417,11 +430,7 @@ pub mod guard {
             assert_eq!(libc::pthread_attr_getstack(&attr, &mut stackaddr, &mut size), 0);
 
             let stackaddr = stackaddr as usize;
-            ret = if cfg!(target_os = "freebsd") {
-                // FIXME does freebsd really fault *below* the guard addr?
-                let guardaddr = stackaddr - guardsize;
-                Some(guardaddr - PAGE_SIZE.load(Ordering::Relaxed)..guardaddr)
-            } else if cfg!(target_os = "netbsd") {
+            ret = if cfg!(any(target_os = "freebsd", target_os = "netbsd")) {
                 Some(stackaddr - guardsize..stackaddr)
             } else if cfg!(all(target_os = "linux", target_env = "musl")) {
                 Some(stackaddr - guardsize..stackaddr)

src/librustdoc/core.rs

@@ -1,3 +1,4 @@
+use rustc_ast as ast;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync::{self, Lrc};
 use rustc_driver::abort_on_err;
@@ -22,7 +23,7 @@ use rustc_session::DiagnosticOutput;
 use rustc_session::Session;
 use rustc_span::source_map;
 use rustc_span::symbol::sym;
-use rustc_span::{Span, DUMMY_SP};
+use rustc_span::Span;
 
 use std::cell::RefCell;
 use std::collections::hash_map::Entry;
@@ -348,42 +349,65 @@ crate fn create_config(
 }
 
 crate fn create_resolver<'a>(
-    externs: config::Externs,
     queries: &Queries<'a>,
     sess: &Session,
 ) -> Rc<RefCell<interface::BoxedResolver>> {
-    let extern_names: Vec<String> = externs
-        .iter()
-        .filter(|(_, entry)| entry.add_prelude)
-        .map(|(name, _)| name)
-        .cloned()
-        .collect();
-
     let parts = abort_on_err(queries.expansion(), sess).peek();
-    let resolver = parts.1.borrow();
-
-    // Before we actually clone it, let's force all the extern'd crates to
-    // actually be loaded, just in case they're only referred to inside
-    // intra-doc links
-    resolver.borrow_mut().access(|resolver| {
-        sess.time("load_extern_crates", || {
-            for extern_name in &extern_names {
-                debug!("loading extern crate {}", extern_name);
-                if let Err(()) = resolver
-                    .resolve_str_path_error(
-                        DUMMY_SP,
-                        extern_name,
-                        TypeNS,
-                        LocalDefId { local_def_index: CRATE_DEF_INDEX }.to_def_id(),
-                  ) {
-                    warn!("unable to resolve external crate {} (do you have an unused `--extern` crate?)", extern_name)
-                  }
+    let (krate, resolver, _) = &*parts;
+    let resolver = resolver.borrow().clone();
+
+    // Letting the resolver escape at the end of the function leads to inconsistencies between the
+    // crates the TyCtxt sees and the resolver sees (because the resolver could load more crates
+    // after escaping). Hopefully `IntraLinkCrateLoader` gets all the crates we need ...
+    struct IntraLinkCrateLoader {
+        current_mod: DefId,
+        resolver: Rc<RefCell<interface::BoxedResolver>>,
+    }
+    impl ast::visit::Visitor<'_> for IntraLinkCrateLoader {
+        fn visit_attribute(&mut self, attr: &ast::Attribute) {
+            use crate::html::markdown::{markdown_links, MarkdownLink};
+            use crate::passes::collect_intra_doc_links::Disambiguator;
+
+            if let Some(doc) = attr.doc_str() {
+                for MarkdownLink { link, .. } in markdown_links(&doc.as_str()) {
+                    // FIXME: this misses a *lot* of the preprocessing done in collect_intra_doc_links
+                    // I think most of it shouldn't be necessary since we only need the crate prefix?
+                    let path_str = match Disambiguator::from_str(&link) {
+                        Ok(x) => x.map_or(link.as_str(), |(_, p)| p),
+                        Err(_) => continue,
+                    };
+                    self.resolver.borrow_mut().access(|resolver| {
+                        let _ = resolver.resolve_str_path_error(
+                            attr.span,
+                            path_str,
+                            TypeNS,
+                            self.current_mod,
+                        );
+                    });
+                }
             }
-        });
-    });
+            ast::visit::walk_attribute(self, attr);
+        }
+
+        fn visit_item(&mut self, item: &ast::Item) {
+            use rustc_ast_lowering::ResolverAstLowering;
+
+            if let ast::ItemKind::Mod(..) = item.kind {
+                let new_mod =
+                    self.resolver.borrow_mut().access(|resolver| resolver.local_def_id(item.id));
+                let old_mod = mem::replace(&mut self.current_mod, new_mod.to_def_id());
+                ast::visit::walk_item(self, item);
+                self.current_mod = old_mod;
+            } else {
+                ast::visit::walk_item(self, item);
+            }
+        }
+    }
+    let crate_id = LocalDefId { local_def_index: CRATE_DEF_INDEX }.to_def_id();
+    let mut loader = IntraLinkCrateLoader { current_mod: crate_id, resolver };
+    ast::visit::walk_crate(&mut loader, krate);
 
-    // Now we're good to clone the resolver because everything should be loaded
-    resolver.clone()
+    loader.resolver
 }
 
 crate fn run_global_ctxt(

src/librustdoc/lib.rs

@@ -31,6 +31,7 @@ extern crate tracing;
 //
 // Dependencies listed in Cargo.toml do not need `extern crate`.
 extern crate rustc_ast;
+extern crate rustc_ast_lowering;
 extern crate rustc_ast_pretty;
 extern crate rustc_attr;
 extern crate rustc_data_structures;
@@ -637,7 +638,6 @@ fn main_options(options: config::Options) -> MainResult {
     let default_passes = options.default_passes;
     let output_format = options.output_format;
     // FIXME: fix this clone (especially render_options)
-    let externs = options.externs.clone();
     let manual_passes = options.manual_passes.clone();
     let render_options = options.render_options.clone();
     let config = core::create_config(options);
@@ -649,7 +649,7 @@ fn main_options(options: config::Options) -> MainResult {
             // We need to hold on to the complete resolver, so we cause everything to be
             // cloned for the analysis passes to use. Suboptimal, but necessary in the
             // current architecture.
-            let resolver = core::create_resolver(externs, queries, &sess);
+            let resolver = core::create_resolver(queries, &sess);
 
             if sess.has_errors() {
                 sess.fatal("Compilation failed, aborting rustdoc");

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -1517,7 +1517,7 @@ fn range_between_backticks(ori_link: &MarkdownLink) -> Range<usize> {
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
 /// Disambiguators for a link.
-enum Disambiguator {
+crate enum Disambiguator {
     /// `prim@`
     ///
     /// This is buggy, see <https://github.com/rust-lang/rust/pull/77875#discussion_r503583103>
@@ -1546,7 +1546,7 @@ impl Disambiguator {
     /// This returns `Ok(Some(...))` if a disambiguator was found,
     /// `Ok(None)` if no disambiguator was found, or `Err(...)`
     /// if there was a problem with the disambiguator.
-    fn from_str(link: &str) -> Result<Option<(Self, &str)>, (String, Range<usize>)> {
+    crate fn from_str(link: &str) -> Result<Option<(Self, &str)>, (String, Range<usize>)> {
         use Disambiguator::{Kind, Namespace as NS, Primitive};
 
         if let Some(idx) = link.find('@') {

src/librustdoc/passes/mod.rs

@@ -30,7 +30,7 @@ crate use self::unindent_comments::UNINDENT_COMMENTS;
 mod propagate_doc_cfg;
 crate use self::propagate_doc_cfg::PROPAGATE_DOC_CFG;
 
-mod collect_intra_doc_links;
+crate mod collect_intra_doc_links;
 crate use self::collect_intra_doc_links::COLLECT_INTRA_DOC_LINKS;
 
 mod doc_test_lints;

src/test/rustdoc-gui/search-tab-selection-if-current-is-empty.goml

@@ -0,0 +1,21 @@
+goto: file://|DOC_PATH|/index.html
+write: (".search-input", "Foo")
+// Waiting for the search results to appear...
+wait-for: "#titles"
+assert: ("#titles > button:nth-of-type(1)", "class", "selected")
+
+// To go back to the original "state"
+goto: file://|DOC_PATH|/index.html
+write: (".search-input", "-> String")
+// Waiting for the search results to appear...
+wait-for: "#titles"
+// With this search, only the last tab shouldn't be empty so it should be selected.
+assert: ("#titles > button:nth-of-type(3)", "class", "selected")
+
+// To go back to the original "state"
+goto: file://|DOC_PATH|/index.html
+write: (".search-input", "-> Something")
+// Waiting for the search results to appear...
+wait-for: "#titles"
+// With this search, all the tabs are empty so the first one should remain selected.
+assert: ("#titles > button:nth-of-type(1)", "class", "selected")

src/test/rustdoc-ui/auxiliary/panic-item.rs

@@ -0,0 +1,15 @@
+#![no_std]
+#![feature(lang_items)]
+
+use core::panic::PanicInfo;
+use core::sync::atomic::{self, Ordering};
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    loop {
+        atomic::compiler_fence(Ordering::SeqCst);
+    }
+}
+
+#[lang = "eh_personality"]
+fn foo() {}

src/test/rustdoc-ui/unused-extern-crate.rs

@@ -0,0 +1,3 @@
+// check-pass
+// aux-crate:panic_item=panic-item.rs
+// @has unused_extern_crate/index.html

src/test/rustdoc/intra-doc/extern-crate-only-used-in-link.rs

@@ -0,0 +1,8 @@
+// aux-build:issue-66159-1.rs
+// aux-crate:priv:issue_66159_1=issue-66159-1.rs
+// build-aux-docs
+// compile-flags:-Z unstable-options
+
+// @has extern_crate_only_used_in_link/index.html
+// @has - '//a[@href="../issue_66159_1/struct.Something.html"]' 'issue_66159_1::Something'
+//! [issue_66159_1::Something]

src/test/ui/mir/issue-83499-input-output-iteration-ice.rs

@@ -0,0 +1,10 @@
+// Test that when in MIR the amount of local_decls and amount of normalized_input_tys don't match
+// that an out-of-bounds access does not occur.
+#![feature(c_variadic)]
+
+fn main() {}
+
+fn foo(_: Bar, ...) -> impl {}
+//~^ ERROR only foreign or `unsafe extern "C" functions may be C-variadic
+//~| ERROR cannot find type `Bar` in this scope
+//~| ERROR at least one trait must be specified

src/test/ui/mir/issue-83499-input-output-iteration-ice.stderr

@@ -0,0 +1,21 @@
+error: only foreign or `unsafe extern "C" functions may be C-variadic
+  --> $DIR/issue-83499-input-output-iteration-ice.rs:7:16
+   |
+LL | fn foo(_: Bar, ...) -> impl {}
+   |                ^^^
+
+error: at least one trait must be specified
+  --> $DIR/issue-83499-input-output-iteration-ice.rs:7:24
+   |
+LL | fn foo(_: Bar, ...) -> impl {}
+   |                        ^^^^
+
+error[E0412]: cannot find type `Bar` in this scope
+  --> $DIR/issue-83499-input-output-iteration-ice.rs:7:11
+   |
+LL | fn foo(_: Bar, ...) -> impl {}
+   |           ^^^ not found in this scope
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0412`.

src/tools/compiletest/src/header.rs

@@ -708,8 +708,8 @@ impl Config {
         self.parse_name_value_directive(line, "aux-crate").map(|r| {
             let mut parts = r.trim().splitn(2, '=');
             (
-                parts.next().expect("aux-crate name").to_string(),
-                parts.next().expect("aux-crate value").to_string(),
+                parts.next().expect("missing aux-crate name (e.g. log=log.rs)").to_string(),
+                parts.next().expect("missing aux-crate value (e.g. log=log.rs)").to_string(),
             )
         })
     }