Tweak -Zinput-stats and -Zmeta-stats output.

To make it match `-Zmacro-stats`, and work better if you have enabled it
for multiple crates.
- Print each crate's name.
- Print a `===` banner at the start and end for separation.

Author: nnethercote

compiler/rustc_interface/src/passes.rs

@@ -370,7 +370,7 @@ fn early_lint_checks(tcx: TyCtxt<'_>, (): ()) {
     let mut lint_buffer = resolver.lint_buffer.steal();
 
     if sess.opts.unstable_opts.input_stats {
-        input_stats::print_ast_stats(krate);
+        input_stats::print_ast_stats(tcx, krate);
     }
 
     // Needs to go *after* expansion to be able to check the results of macro expansion.

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -794,7 +794,8 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
             // `RUSTFLAGS='-Zmeta-stats' cargo build`). It still doesn't guarantee
             // non-interleaving, though.
             let mut s = String::new();
-            _ = writeln!(s, "{prefix} METADATA STATS");
+            _ = writeln!(s, "{prefix} {}", "=".repeat(banner_w));
+            _ = writeln!(s, "{prefix} METADATA STATS: {}", tcx.crate_name(LOCAL_CRATE));
             _ = writeln!(s, "{prefix} {:<section_w$}{:>size_w$}", "Section", "Size");
             _ = writeln!(s, "{prefix} {}", "-".repeat(banner_w));
             for (label, size) in stats {
@@ -814,7 +815,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
                 usize_with_underscores(total_bytes),
                 perc(zero_bytes)
             );
-            _ = writeln!(s, "{prefix}");
+            _ = writeln!(s, "{prefix} {}", "=".repeat(banner_w));
             eprint!("{s}");
         }
 

compiler/rustc_passes/src/input_stats.rs

@@ -65,16 +65,16 @@ pub fn print_hir_stats(tcx: TyCtxt<'_>) {
         StatCollector { tcx: Some(tcx), nodes: FxHashMap::default(), seen: FxHashSet::default() };
     tcx.hir_walk_toplevel_module(&mut collector);
     tcx.hir_walk_attributes(&mut collector);
-    collector.print("HIR STATS", "hir-stats");
+    collector.print(tcx, "HIR STATS", "hir-stats");
 }
 
-pub fn print_ast_stats(krate: &ast::Crate) {
+pub fn print_ast_stats(tcx: TyCtxt<'_>, krate: &ast::Crate) {
     use rustc_ast::visit::Visitor;
 
     let mut collector =
         StatCollector { tcx: None, nodes: FxHashMap::default(), seen: FxHashSet::default() };
     collector.visit_crate(krate);
-    collector.print("POST EXPANSION AST STATS", "ast-stats");
+    collector.print(tcx, "POST EXPANSION AST STATS", "ast-stats");
 }
 
 impl<'k> StatCollector<'k> {
@@ -116,7 +116,7 @@ impl<'k> StatCollector<'k> {
         }
     }
 
-    fn print(&self, title: &str, prefix: &str) {
+    fn print(&self, tcx: TyCtxt<'_>, title: &str, prefix: &str) {
         use std::fmt::Write;
 
         // We will soon sort, so the initial order does not matter.
@@ -142,7 +142,8 @@ impl<'k> StatCollector<'k> {
         // `RUSTFLAGS='-Zinput-stats' cargo build`). It still doesn't guarantee
         // non-interleaving, though.
         let mut s = String::new();
-        _ = writeln!(s, "{prefix} {title}");
+        _ = writeln!(s, "{prefix} {}", "=".repeat(banner_w));
+        _ = writeln!(s, "{prefix} {title}: {}", tcx.crate_name(hir::def_id::LOCAL_CRATE));
         _ = writeln!(
             s,
             "{prefix} {:<name_w$}{:>acc_size_w$}{:>count_w$}{:>item_size_w$}",
@@ -193,7 +194,7 @@ impl<'k> StatCollector<'k> {
             "",
             usize_with_underscores(total_count),
         );
-        _ = writeln!(s, "{prefix}");
+        _ = writeln!(s, "{prefix} {}", "=".repeat(banner_w));
         eprint!("{s}");
     }
 }

tests/ui/stats/input-stats.stderr

@@ -1,4 +1,5 @@
-ast-stats POST EXPANSION AST STATS
+ast-stats ================================================================
+ast-stats POST EXPANSION AST STATS: input_stats
 ast-stats Name                Accumulated Size         Count     Item Size
 ast-stats ----------------------------------------------------------------
 ast-stats Item                   1_584 (NN.N%)            11           144
@@ -57,8 +58,9 @@ ast-stats - AngleBracketed            40 (NN.N%)             1
 ast-stats Crate                     40 (NN.N%)             1            40
 ast-stats ----------------------------------------------------------------
 ast-stats Total                  7_416                   127
-ast-stats
-hir-stats HIR STATS
+ast-stats ================================================================
+hir-stats ================================================================
+hir-stats HIR STATS: input_stats
 hir-stats Name                Accumulated Size         Count     Item Size
 hir-stats ----------------------------------------------------------------
 hir-stats PathSegment            1_776 (NN.N%)            37            48
@@ -118,4 +120,4 @@ hir-stats Lifetime                  28 (NN.N%)             1            28
 hir-stats ForeignItemRef            24 (NN.N%)             1            24
 hir-stats ----------------------------------------------------------------
 hir-stats Total                  8_676                   172
-hir-stats
+hir-stats ================================================================