Add shallow_find_files helper function to run-make-support

Author: Oneirical

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

@@ -247,32 +247,33 @@ pub fn test_while_readonly<P: AsRef<Path>, F: FnOnce() + std::panic::UnwindSafe>
     success.unwrap();
 }
 
-/// Browse the directory `path` non-recursively and return the first file path which starts with `prefix` and has the
-/// file extension `extension`.
+/// Browse the directory `path` non-recursively and return all files which respect the parameters
+/// outlined by `closure`.
 #[track_caller]
-pub fn find_files_by_prefix_and_extension<P: AsRef<Path>>(
+pub fn shallow_find_files<P: AsRef<Path>, F: Fn(&PathBuf) -> bool>(
     path: P,
-    prefix: &str,
-    extension: &str,
+    closure: F,
 ) -> Vec<PathBuf> {
     let mut matching_files = Vec::new();
     for entry in fs_wrapper::read_dir(path) {
         let entry = entry.expect("failed to read directory entry.");
         let path = entry.path();
 
-        if path.is_file()
-            && path.file_name().unwrap().to_str().unwrap().starts_with(prefix)
-            && path.extension().unwrap().to_str().unwrap() == extension
-        {
+        if path.is_file() && closure(&path) {
             matching_files.push(path);
         }
     }
+    matching_files
+}
 
-    if matching_files.is_empty() {
-        panic!("no files found with the given prefix and extension");
-    } else {
-        matching_files
-    }
+/// Returns true if the filename at `path` starts with `prefix`.
+pub fn has_prefix<P: AsRef<Path>>(path: P, prefix: &str) -> bool {
+    path.as_ref().file_name().is_some_and(|name| name.to_str().unwrap().starts_with(prefix))
+}
+
+/// Returns true if the filename at `path` has the extension `extension`.
+pub fn has_extension<P: AsRef<Path>>(path: P, extension: &str) -> bool {
+    path.as_ref().extension().is_some_and(|ext| ext == extension)
 }
 
 /// Use `cygpath -w` on a path to get a Windows path string back. This assumes that `cygpath` is

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

@@ -6,13 +6,13 @@
 //@ needs-profiler-support
 //@ ignore-cross-compile
 
-use run_make_support::{cwd, find_files_by_prefix_and_extension, run, rustc};
+use run_make_support::{cwd, has_extension, has_prefix, run, rustc, shallow_find_files};
 
 fn main() {
-    rustc().arg("-g").profile_generate(cwd()).run();
+    rustc().arg("-g").profile_generate(cwd()).input("test.rs").run();
     run("test");
-    assert!(
-        find_files_by_prefix_and_extension(cwd(), "default", "profraw").len() > 0,
-        "no .profraw file generated"
-    );
+    let profraw_files = shallow_find_files(cwd(), |path| {
+        has_prefix(path, "default") && has_extension(path, "profraw")
+    });
+    assert!(!profraw_files.is_empty(), "no .profraw file generated");
 }

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

@@ -9,8 +9,8 @@
 //@ ignore-cross-compile
 
 use run_make_support::{
-    cwd, find_files_by_prefix_and_extension, fs_wrapper, llvm_filecheck, llvm_profdata,
-    run_with_args, rustc,
+    cwd, fs_wrapper, has_extension, has_prefix, llvm_filecheck, llvm_profdata, run_with_args,
+    rustc, shallow_find_files,
 };
 
 fn main() {
@@ -28,11 +28,11 @@ fn main() {
     // 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();
+    let profraw_files = shallow_find_files(cwd(), |path| {
+        has_prefix(path, "default") && has_extension(path, "profraw")
+    });
+    let profraw_file = profraw_files.get(0).unwrap();
+    llvm_profdata().merge().output("merged.profdata").input(profraw_file).run();
     // Compile the test program again, making use of the profiling data
     rustc()
         .opt_level("2")
@@ -42,13 +42,14 @@ fn main() {
         .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
+    // Check that the generate IR contains some things that we expect.
+    // We feed the file into LLVM FileCheck tool *with its lines reversed* 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();
+    let ir = fs_wrapper::read_to_string("main.ll");
+    let lines: Vec<_> = ir.lines().rev().collect();
+    let mut reversed_ir = lines.join("\n");
+    reversed_ir.push('\n');
+    llvm_filecheck().patterns("filecheck-patterns.txt").stdin(reversed_ir.as_bytes()).run();
 }