Don't require a DocContext for report_diagnostic

This is needed for the next commit, which needs access to the `cx` from
within the `decorate` closure.

- Change `as_local_hir_id` to an associated function, since it only
  needs a `TyCtxt`
- Change `source_span_for_markdown_range` to only take a `TyCtxt`

src/librustdoc/core.rs

@@ -169,13 +169,13 @@ impl<'tcx> DocContext<'tcx> {
 
     /// Like `hir().local_def_id_to_hir_id()`, but skips calling it on fake DefIds.
     /// (This avoids a slice-index-out-of-bounds panic.)
-    crate fn as_local_hir_id(&self, def_id: DefId) -> Option<HirId> {
+    crate fn as_local_hir_id(tcx: TyCtxt<'_>, def_id: DefId) -> Option<HirId> {
         if MAX_DEF_IDX.with(|m| {
             m.borrow().get(&def_id.krate).map(|&idx| idx <= def_id.index).unwrap_or(false)
         }) {
             None
         } else {
-            def_id.as_local().map(|def_id| self.tcx.hir().local_def_id_to_hir_id(def_id))
+            def_id.as_local().map(|def_id| tcx.hir().local_def_id_to_hir_id(def_id))
         }
     }
 }
@@ -479,7 +479,7 @@ crate fn run_global_ctxt(
                 https://doc.rust-lang.org/nightly/rustdoc/how-to-write-documentation.html";
             tcx.struct_lint_node(
                 crate::lint::MISSING_CRATE_LEVEL_DOCS,
-                ctxt.as_local_hir_id(m.def_id).unwrap(),
+                DocContext::as_local_hir_id(tcx, m.def_id).unwrap(),
                 |lint| {
                     let mut diag =
                         lint.build("no documentation found for this crate's top-level module");

src/librustdoc/passes/check_code_block_syntax.rs

@@ -48,9 +48,12 @@ impl<'a, 'tcx> SyntaxChecker<'a, 'tcx> {
         let buffer = buffer.borrow();
 
         if buffer.has_errors || is_empty {
-            let mut diag = if let Some(sp) =
+            let mut diag = if let Some(sp) = super::source_span_for_markdown_range(
-                super::source_span_for_markdown_range(self.cx, &dox, &code_block.range, &item.attrs)
+                self.cx.tcx,
-            {
+                &dox,
+                &code_block.range,
+                &item.attrs,
+            ) {
                 let (warning_message, suggest_using_text) = if buffer.has_errors {
                     ("could not parse code block as Rust code", true)
                 } else {

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -1146,7 +1146,7 @@ impl LinkCollector<'_, '_> {
                 suggest_disambiguator(resolved, diag, path_str, dox, sp, &ori_link.range);
             };
             report_diagnostic(
-                self.cx,
+                self.cx.tcx,
                 BROKEN_INTRA_DOC_LINKS,
                 &msg,
                 &item,
@@ -1220,7 +1220,7 @@ impl LinkCollector<'_, '_> {
                         && !self.cx.tcx.features().intra_doc_pointers
                     {
                         let span = super::source_span_for_markdown_range(
-                            self.cx,
+                            self.cx.tcx,
                             dox,
                             &ori_link.range,
                             &item.attrs,
@@ -1674,7 +1674,7 @@ impl Suggestion {
 /// parameter of the callback will contain it, and the primary span of the diagnostic will be set
 /// to it.
 fn report_diagnostic(
-    cx: &DocContext<'_>,
+    tcx: TyCtxt<'_>,
     lint: &'static Lint,
     msg: &str,
     item: &Item,
@@ -1682,7 +1682,7 @@ fn report_diagnostic(
     link_range: &Range<usize>,
     decorate: impl FnOnce(&mut DiagnosticBuilder<'_>, Option<rustc_span::Span>),
 ) {
-    let hir_id = match cx.as_local_hir_id(item.def_id) {
+    let hir_id = match DocContext::as_local_hir_id(tcx, item.def_id) {
         Some(hir_id) => hir_id,
         None => {
             // If non-local, no need to check anything.
@@ -1694,10 +1694,10 @@ fn report_diagnostic(
     let attrs = &item.attrs;
     let sp = span_of_attrs(attrs).unwrap_or(item.source.span());
 
-    cx.tcx.struct_span_lint_hir(lint, hir_id, sp, |lint| {
+    tcx.struct_span_lint_hir(lint, hir_id, sp, |lint| {
         let mut diag = lint.build(msg);
 
-        let span = super::source_span_for_markdown_range(cx, dox, link_range, attrs);
+        let span = super::source_span_for_markdown_range(tcx, dox, link_range, attrs);
 
         if let Some(sp) = span {
             diag.set_span(sp);
@@ -1742,7 +1742,7 @@ fn resolution_failure(
 ) {
     let tcx = collector.cx.tcx;
     report_diagnostic(
-        collector.cx,
+        tcx,
         BROKEN_INTRA_DOC_LINKS,
         &format!("unresolved link to `{}`", path_str),
         item,
@@ -1973,7 +1973,7 @@ fn anchor_failure(
         ),
     };
 
-    report_diagnostic(cx, BROKEN_INTRA_DOC_LINKS, &msg, item, dox, &link_range, |diag, sp| {
+    report_diagnostic(cx.tcx, BROKEN_INTRA_DOC_LINKS, &msg, item, dox, &link_range, |diag, sp| {
         if let Some(sp) = sp {
             diag.span_label(sp, "contains invalid anchor");
         }
@@ -2013,7 +2013,7 @@ fn ambiguity_error(
         }
     }
 
-    report_diagnostic(cx, BROKEN_INTRA_DOC_LINKS, &msg, item, dox, &link_range, |diag, sp| {
+    report_diagnostic(cx.tcx, BROKEN_INTRA_DOC_LINKS, &msg, item, dox, &link_range, |diag, sp| {
         if let Some(sp) = sp {
             diag.span_label(sp, "ambiguous link");
         } else {
@@ -2066,7 +2066,7 @@ fn privacy_error(cx: &DocContext<'_>, item: &Item, path_str: &str, dox: &str, li
     let msg =
         format!("public documentation for `{}` links to private item `{}`", item_name, path_str);
 
-    report_diagnostic(cx, PRIVATE_INTRA_DOC_LINKS, &msg, item, dox, &link.range, |diag, sp| {
+    report_diagnostic(cx.tcx, PRIVATE_INTRA_DOC_LINKS, &msg, item, dox, &link.range, |diag, sp| {
         if let Some(sp) = sp {
             diag.span_label(sp, "this item is private");
         }

src/librustdoc/passes/doc_test_lints.rs

@@ -73,7 +73,7 @@ crate fn should_have_doc_example(cx: &DocContext<'_>, item: &clean::Item) -> boo
 }
 
 crate fn look_for_tests<'tcx>(cx: &DocContext<'tcx>, dox: &str, item: &Item) {
-    let hir_id = match cx.as_local_hir_id(item.def_id) {
+    let hir_id = match DocContext::as_local_hir_id(cx.tcx, item.def_id) {
         Some(hir_id) => hir_id,
         None => {
             // If non-local, no need to check anything.

src/librustdoc/passes/html_tags.rs

@@ -167,7 +167,8 @@ fn extract_tags(
 
 impl<'a, 'tcx> DocFolder for InvalidHtmlTagsLinter<'a, 'tcx> {
     fn fold_item(&mut self, item: Item) -> Option<Item> {
-        let hir_id = match self.cx.as_local_hir_id(item.def_id) {
+        let tcx = self.cx.tcx;
+        let hir_id = match DocContext::as_local_hir_id(tcx, item.def_id) {
             Some(hir_id) => hir_id,
             None => {
                 // If non-local, no need to check anything.
@@ -176,13 +177,12 @@ impl<'a, 'tcx> DocFolder for InvalidHtmlTagsLinter<'a, 'tcx> {
         };
         let dox = item.attrs.collapsed_doc_value().unwrap_or_default();
         if !dox.is_empty() {
-            let cx = &self.cx;
             let report_diag = |msg: &str, range: &Range<usize>| {
-                let sp = match super::source_span_for_markdown_range(cx, &dox, range, &item.attrs) {
+                let sp = match super::source_span_for_markdown_range(tcx, &dox, range, &item.attrs) {
                     Some(sp) => sp,
                     None => span_of_attrs(&item.attrs).unwrap_or(item.source.span()),
                 };
-                cx.tcx.struct_span_lint_hir(crate::lint::INVALID_HTML_TAGS, hir_id, sp, |lint| {
+                tcx.struct_span_lint_hir(crate::lint::INVALID_HTML_TAGS, hir_id, sp, |lint| {
                     lint.build(msg).emit()
                 });
             };

src/librustdoc/passes/mod.rs

@@ -1,6 +1,7 @@
 //! Contains information about "passes", used to modify crate information during the documentation
 //! process.
 
+use rustc_middle::ty::TyCtxt;
 use rustc_span::{InnerSpan, Span, DUMMY_SP};
 use std::ops::Range;
 
@@ -167,7 +168,7 @@ crate fn span_of_attrs(attrs: &clean::Attributes) -> Option<Span> {
 /// attributes are not all sugared doc comments. It's difficult to calculate the correct span in
 /// that case due to escaping and other source features.
 crate fn source_span_for_markdown_range(
-    cx: &DocContext<'_>,
+    tcx: TyCtxt<'_>,
     markdown: &str,
     md_range: &Range<usize>,
     attrs: &clean::Attributes,
@@ -179,7 +180,7 @@ crate fn source_span_for_markdown_range(
         return None;
     }
 
-    let snippet = cx.sess().source_map().span_to_snippet(span_of_attrs(attrs)?).ok()?;
+    let snippet = tcx.sess.source_map().span_to_snippet(span_of_attrs(attrs)?).ok()?;
 
     let starting_line = markdown[..md_range.start].matches('\n').count();
     let ending_line = starting_line + markdown[md_range.start..md_range.end].matches('\n').count();

src/librustdoc/passes/non_autolinks.rs

@@ -60,7 +60,7 @@ crate fn check_non_autolinks(krate: Crate, cx: &mut DocContext<'_>) -> Crate {
 
 impl<'a, 'tcx> DocFolder for NonAutolinksLinter<'a, 'tcx> {
     fn fold_item(&mut self, item: Item) -> Option<Item> {
-        let hir_id = match self.cx.as_local_hir_id(item.def_id) {
+        let hir_id = match DocContext::as_local_hir_id(self.cx.tcx, item.def_id) {
             Some(hir_id) => hir_id,
             None => {
                 // If non-local, no need to check anything.
@@ -70,7 +70,7 @@ impl<'a, 'tcx> DocFolder for NonAutolinksLinter<'a, 'tcx> {
         let dox = item.attrs.collapsed_doc_value().unwrap_or_default();
         if !dox.is_empty() {
             let report_diag = |cx: &DocContext<'_>, msg: &str, url: &str, range: Range<usize>| {
-                let sp = super::source_span_for_markdown_range(cx, &dox, &range, &item.attrs)
+                let sp = super::source_span_for_markdown_range(cx.tcx, &dox, &range, &item.attrs)
                     .or_else(|| span_of_attrs(&item.attrs))
                     .unwrap_or(item.source.span());
                 cx.tcx.struct_span_lint_hir(crate::lint::NON_AUTOLINKS, hir_id, sp, |lint| {