rewrite dump-mono-stats to rmake format

Author: Oneirical

src/tools/run-make-support/src/rustc.rs

@@ -99,6 +99,13 @@ impl Rustc {
         self
     }
 
+    /// Specify the path where monomorphization stats will be dumped..
+    pub fn dump_mono_stats<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+        let path = path.as_ref().to_string_lossy();
+        self.cmd.arg(format!("-Zdump-mono-stats={path}"));
+        self
+    }
+
     /// Specify path to the input file.
     pub fn input<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
         self.cmd.arg(path.as_ref());
@@ -179,7 +186,11 @@ impl Rustc {
     }
 
     /// Add a directory to the library search path with a restriction. Equivalent to `-L KIND=PATH` in rustc.
-    pub fn specific_library_search_path<P: AsRef<Path>>(&mut self, kind: &str, path: P) -> &mut Self {
+    pub fn specific_library_search_path<P: AsRef<Path>>(
+        &mut self,
+        kind: &str,
+        path: P,
+    ) -> &mut Self {
         assert!(["dependency", "native", "all", "framework", "crate"].contains(&kind));
         let path = path.as_ref().to_string_lossy();
         self.cmd.arg(format!("-L{kind}={path}"));

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -31,7 +31,6 @@ run-make/dep-info-doesnt-run-much/Makefile
 run-make/dep-info-spaces/Makefile
 run-make/dep-info/Makefile
 run-make/dump-ice-to-disk/Makefile
-run-make/dump-mono-stats/Makefile
 run-make/duplicate-output-flavors/Makefile
 run-make/dylib-chain/Makefile
 run-make/emit-path-unhashed/Makefile

tests/run-make/dump-mono-stats/Makefile

@@ -0,0 +1,12 @@
+// A flag named dump-mono-stats was added to the compiler in 2022, which
+// collects stats on instantiation of items and their associated costs.
+// This test checks that the output stat file exists, and that it contains
+// a specific expected string.
+// See https://github.com/rust-lang/rust/pull/105481
+
+use run_make_support::{cwd, fs_wrapper, rustc};
+
+fn main() {
+    rustc().crate_type("lib").input("foo.rs").dump_mono_stats(cwd()).arg("-Zdump-mono-stats-format=json").run();
+    assert!(fs_wrapper::read_to_string("foo.mono_items.json").contains("\"name\":\"bar\"");
+}