Rollup merge of #127510 - tgross35:test-float-parse-update, r=Mark-Simulacrum

Rewrite `test-float-parse` in Rust

Migrate from the currently broken Rust + Python `test-float-parse` to a Rust implementation. This newer version should be significantly faster (tests execute in parallel with threads, rather than series across multiple processes, which also eliminates the "...the worker processes are leaked and stick around forever" message), and should be significantly easier to extend to the new float types.

Since this is faster and hopefully more stable, we should be able to launch it with `x` and run the faster tests in CI.

5 files changed, 83 insertions, 0 deletions

diff --git a/src/bootstrap/mk/Makefile.in b/src/bootstrap/mk/Makefile.in
index 7e38a0996e5..9acd85cddde 100644
--- a/src/bootstrap/mk/Makefile.in
+++ b/src/bootstrap/mk/Makefile.in
@@ -51,6 +51,7 @@ check-aux:
 	$(Q)$(BOOTSTRAP) test --stage 2 \
 		src/tools/cargo \
 		src/tools/cargotest \
+		src/etc/test-float-parse \
 		$(BOOTSTRAP_ARGS)
 	# Run standard library tests in Miri.
 	$(Q)BOOTSTRAP_SKIP_TARGET_SANITY=1 \
diff --git a/src/bootstrap/src/core/build_steps/check.rs b/src/bootstrap/src/core/build_steps/check.rs
index 8235d4634b7..ed5b9edc86d 100644
--- a/src/bootstrap/src/core/build_steps/check.rs
+++ b/src/bootstrap/src/core/build_steps/check.rs
@@ -466,6 +466,7 @@ tool_check_step!(CargoMiri, "src/tools/miri/cargo-miri", SourceType::InTree);
 tool_check_step!(Rls, "src/tools/rls", SourceType::InTree);
 tool_check_step!(Rustfmt, "src/tools/rustfmt", SourceType::InTree);
 tool_check_step!(MiroptTestTools, "src/tools/miropt-test-tools", SourceType::InTree);
+tool_check_step!(TestFloatParse, "src/etc/test-float-parse", SourceType::InTree);
 
 tool_check_step!(Bootstrap, "src/bootstrap", SourceType::InTree, false);
 
diff --git a/src/bootstrap/src/core/build_steps/clippy.rs b/src/bootstrap/src/core/build_steps/clippy.rs
index 40a2112b192..ee7fb368a8c 100644
--- a/src/bootstrap/src/core/build_steps/clippy.rs
+++ b/src/bootstrap/src/core/build_steps/clippy.rs
@@ -326,4 +326,5 @@ lint_any!(
     Rustfmt, "src/tools/rustfmt", "rustfmt";
     RustInstaller, "src/tools/rust-installer", "rust-installer";
     Tidy, "src/tools/tidy", "tidy";
+    TestFloatParse, "src/etc/test-float-parse", "test-float-parse";
 );
diff --git a/src/bootstrap/src/core/build_steps/test.rs b/src/bootstrap/src/core/build_steps/test.rs
index 3f0cbde64e3..cc5931c68db 100644
--- a/src/bootstrap/src/core/build_steps/test.rs
+++ b/src/bootstrap/src/core/build_steps/test.rs
@@ -3505,3 +3505,80 @@ impl Step for CodegenGCC {
         cargo.into_cmd().run(builder);
     }
 }
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct TestFloatParse {
+    path: PathBuf,
+    host: TargetSelection,
+}
+
+impl Step for TestFloatParse {
+    type Output = ();
+    const ONLY_HOSTS: bool = true;
+    const DEFAULT: bool = true;
+
+    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+        run.path("src/etc/test-float-parse")
+    }
+
+    fn make_run(run: RunConfig<'_>) {
+        for path in run.paths {
+            let path = path.assert_single_path().path.clone();
+            run.builder.ensure(Self { path, host: run.target });
+        }
+    }
+
+    fn run(self, builder: &Builder<'_>) {
+        let bootstrap_host = builder.config.build;
+        let compiler = builder.compiler(0, bootstrap_host);
+        let path = self.path.to_str().unwrap();
+        let crate_name = self.path.components().last().unwrap().as_os_str().to_str().unwrap();
+
+        builder.ensure(compile::Std::new(compiler, self.host));
+
+        // Run any unit tests in the crate
+        let cargo_test = tool::prepare_tool_cargo(
+            builder,
+            compiler,
+            Mode::ToolStd,
+            bootstrap_host,
+            "test",
+            path,
+            SourceType::InTree,
+            &[],
+        );
+
+        run_cargo_test(
+            cargo_test,
+            &[],
+            &[],
+            crate_name,
+            crate_name,
+            compiler,
+            bootstrap_host,
+            builder,
+        );
+
+        // Run the actual parse tests.
+        let mut cargo_run = tool::prepare_tool_cargo(
+            builder,
+            compiler,
+            Mode::ToolStd,
+            bootstrap_host,
+            "run",
+            path,
+            SourceType::InTree,
+            &[],
+        );
+
+        cargo_run.arg("--");
+        if builder.config.args().is_empty() {
+            // By default, exclude tests that take longer than ~1m.
+            cargo_run.arg("--skip-huge");
+        } else {
+            cargo_run.args(builder.config.args());
+        }
+
+        cargo_run.into_cmd().run(builder);
+    }
+}
diff --git a/src/bootstrap/src/core/builder.rs b/src/bootstrap/src/core/builder.rs
index 6d6df650b14..78fbea2e810 100644
--- a/src/bootstrap/src/core/builder.rs
+++ b/src/bootstrap/src/core/builder.rs
@@ -826,6 +826,7 @@ impl<'a> Builder<'a> {
                 clippy::Rustdoc,
                 clippy::Rustfmt,
                 clippy::RustInstaller,
+                clippy::TestFloatParse,
                 clippy::Tidy,
             ),
             Kind::Check | Kind::Fix => describe!(
@@ -840,6 +841,7 @@ impl<'a> Builder<'a> {
                 check::Rls,
                 check::Rustfmt,
                 check::RustAnalyzer,
+                check::TestFloatParse,
                 check::Bootstrap,
             ),
             Kind::Test => describe!(
@@ -901,6 +903,7 @@ impl<'a> Builder<'a> {
                 test::RustdocJson,
                 test::HtmlCheck,
                 test::RustInstaller,
+                test::TestFloatParse,
                 // Run bootstrap close to the end as it's unlikely to fail
                 test::Bootstrap,
                 // Run run-make last, since these won't pass without make on Windows