simplify llvm helper functions in run_make_support

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

@@ -1,5 +1,3 @@
-use std::fs::File;
-use std::io::{BufReader, Read, Write};
 use std::path::{Path, PathBuf};
 
 use crate::{env_var, Command};
@@ -111,18 +109,9 @@ impl LlvmFilecheck {
         Self { cmd }
     }
 
-    /// Pipe a file into standard input containing patterns that will be matched against the .patterns(path) call.
-    pub fn stdin<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
-        let file = File::open(path).unwrap();
-        let reader = BufReader::new(file);
-        let byte_vec = read_bytes(reader).expect("failed to read bytes of standard input");
-        let byte_slice = byte_vec.as_slice();
-        self.cmd.stdin(std::process::Stdio::piped());
-        let mut child = self.cmd.spawn().unwrap();
-        let mut stdin = child.stdin.take().unwrap();
-        stdin.write_all(byte_slice).unwrap();
-        stdin.flush().unwrap();
-        child.wait_with_output().unwrap();
+    /// Pipe a read file into standard input containing patterns that will be matched against the .patterns(path) call.
+    pub fn stdin<I: AsRef<[u8]>>(&mut self, input: I) -> &mut Self {
+        self.cmd.set_stdin(input.as_ref().to_vec().into_boxed_slice());
         self
     }
 
@@ -132,9 +121,3 @@ impl LlvmFilecheck {
         self
     }
 }
-
-fn read_bytes<R: Read>(mut reader: R) -> Result<Vec<u8>, std::io::Error> {
-    let mut buffer = Vec::new();
-    reader.read_to_end(&mut buffer)?;
-    Ok(buffer)
-}

tests/run-make/pgo-branch-weights/rmake.rs

@@ -13,17 +13,15 @@
 // (This test has problems generating profdata on mingw. This could use further investigation.)
 //@ ignore-windows-gnu
 
-use run_make_support::{llvm_filecheck, llvm_profdata, run_with_args, rustc};
+use run_make_support::{fs_wrapper, llvm_filecheck, llvm_profdata, run_with_args, rustc};
 use std::fs;
 use std::path::Path;
 
-//FIXME(Oneirical): Edit this test to use fs_wrapper and rmake_out_path.
-
 fn main() {
     let path_prof_data_dir = Path::new("prof_data_dir");
     let path_merged_profdata = path_prof_data_dir.join("merged.profdata");
     rustc().input("opaque.rs").run();
-    fs::create_dir_all(&path_prof_data_dir).unwrap();
+    fs_wrapper::create_dir_all(&path_prof_data_dir);
     rustc()
         .input("interesting.rs")
         .profile_generate(&path_prof_data_dir)
@@ -40,5 +38,8 @@ fn main() {
         .codegen_units(1)
         .emit("llvm-ir")
         .run();
-    llvm_filecheck().patterns("filecheck-patterns.txt").stdin("interesting.ll").run();
+    llvm_filecheck()
+        .patterns("filecheck-patterns.txt")
+        .stdin(fs_wrapper::read("interesting.ll"))
+        .run();
 }