rewrite pgo-use to rmake

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -110,7 +110,6 @@ run-make/pdb-buildinfo-cl-cmd/Makefile
 run-make/pgo-gen-lto/Makefile
 run-make/pgo-gen-no-imp-symbols/Makefile
 run-make/pgo-indirect-call-promotion/Makefile
-run-make/pgo-use/Makefile
 run-make/pointer-auth-link-with-c/Makefile
 run-make/print-calling-conventions/Makefile
 run-make/print-target-list/Makefile

tests/run-make/pgo-use/Makefile

@@ -1,43 +0,0 @@
-# needs-profiler-support
-# ignore-cross-compile
-
-include ../tools.mk
-
-# This test makes sure that PGO profiling data leads to cold functions being
-# marked as `cold` and hot functions with `inlinehint`.
-# The test program contains an `if` were actual execution only ever takes the
-# `else` branch. Accordingly, we expect the function that is never called to
-# be marked as cold.
-#
-# Disable the pre-inlining pass (i.e. a pass that does some inlining before
-# it adds the profiling instrumentation). Disabling this pass leads to
-# rather predictable IR which we need for this test to be stable.
-
-COMMON_FLAGS=-Copt-level=2 -Ccodegen-units=1 -Cllvm-args=-disable-preinline
-
-ifeq ($(UNAME),Darwin)
-# macOS does not have the `tac` command, but `tail -r` does the same thing
-TAC := tail -r
-else
-# some other platforms don't support the `-r` flag for `tail`, so use `tac`
-TAC := tac
-endif
-
-all:
-	# Compile the test program with instrumentation
-	$(RUSTC) $(COMMON_FLAGS) -Cprofile-generate="$(TMPDIR)" main.rs
-	# Run it in order to generate some profiling data
-	$(call RUN,main some-argument) || exit 1
-	# Postprocess the profiling data so it can be used by the compiler
-	"$(LLVM_BIN_DIR)"/llvm-profdata merge \
-		-o "$(TMPDIR)"/merged.profdata \
-		"$(TMPDIR)"/default_*.profraw
-	# Compile the test program again, making use of the profiling data
-	$(RUSTC) $(COMMON_FLAGS) -Cprofile-use="$(TMPDIR)"/merged.profdata --emit=llvm-ir main.rs
-	# Check that the generate IR contains some things that we expect
-	#
-	# We feed the file into LLVM FileCheck tool *in reverse* so that we see the
-	# line with the function name before the line with the function attributes.
-	# FileCheck only supports checking that something matches on the next line,
-	# but not if something matches on the previous line.
-	$(TAC) "$(TMPDIR)"/main.ll | "$(LLVM_FILECHECK)" filecheck-patterns.txt

tests/run-make/pgo-use/rmake.rs

@@ -0,0 +1,54 @@
+// This test makes sure that PGO profiling data leads to cold functions being
+// marked as `cold` and hot functions with `inlinehint`.
+// The test program contains an `if` where actual execution only ever takes the
+// `else` branch. Accordingly, we expect the function that is never called to
+// be marked as cold.
+// See https://github.com/rust-lang/rust/pull/60262
+
+//@ needs-profiler-support
+//@ ignore-cross-compile
+
+use run_make_support::{
+    cwd, find_files_by_prefix_and_extension, fs_wrapper, llvm_filecheck, llvm_profdata,
+    run_with_args, rustc,
+};
+
+fn main() {
+    // Compile the test program with instrumentation
+    // Disable the pre-inlining pass (i.e. a pass that does some inlining before
+    // it adds the profiling instrumentation). Disabling this pass leads to
+    // rather predictable IR which we need for this test to be stable.
+    rustc()
+        .opt_level("2")
+        .codegen_units(1)
+        .arg("-Cllvm-args=-disable-preinline")
+        .profile_generate(cwd())
+        .input("main.rs")
+        .run();
+    // Run it in order to generate some profiling data
+    run_with_args("main", &["some-argument"]);
+    // Postprocess the profiling data so it can be used by the compiler
+    llvm_profdata()
+        .merge()
+        .output("merged.profdata")
+        .input(find_files_by_prefix_and_extension(cwd(), "default", "profraw").get(0).unwrap())
+        .run();
+    // Compile the test program again, making use of the profiling data
+    rustc()
+        .opt_level("2")
+        .codegen_units(1)
+        .arg("-Cllvm-args=-disable-preinline")
+        .profile_use("merged.profdata")
+        .emit("llvm-ir")
+        .input("main.rs")
+        .run();
+    // Check that the generate IR contains some things that we expect
+    //
+    // We feed the file into LLVM FileCheck tool *in reverse* so that we see the
+    // line with the function name before the line with the function attributes.
+    // FileCheck only supports checking that something matches on the next line,
+    // but not if something matches on the previous line.
+    let mut bytes = fs_wrapper::read("interesting.ll");
+    bytes.reverse();
+    llvm_filecheck().patterns("filecheck-patterns.txt").stdin(bytes).run();
+}