LLVM verification attempt

Author: Oneirical

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

@@ -1,7 +1,7 @@
 extern crate interesting;
 
 fn main() {
-    let arg = std::env::args().skip(1).next().unwrap();
+    let arg = "aaaaaaaaaaaa2bbbbbbbbbbbb2bbbbbbbbbbbbbbbbcc";
 
     for c in arg.chars() {
         if c == '2' {

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

@@ -7,9 +7,20 @@
 // If the test passes, the expected function call count was added to the use-phase LLVM-IR.
 // See https://github.com/rust-lang/rust/pull/66631
 
-use run_make_support::{run, rustc, tmp_dir};
+
+// FIXME(mati865): MinGW GCC miscompiles compiler-rt profiling library but with Clang it works
+// properly. Since we only have GCC on the CI ignore the test for now.
+
+//@ needs-profiler-support
+//@ ignore-windows-gnu
+//@ ignore-cross-compile
+
+use std::io::{self, Write};
+use std::process::Command;
 
 fn main() {
+    // For some very small programs GNU ld seems to not properly handle
+    // instrumentation sections correctly. Neither Gold nor LLD have that problem.use run_make_support::{run, rustc, tmp_dir};
     let common_flags = if env::consts::OS == "linux" && env::var("TARGET").unwrap_or_default().contains("x86") {
         "-Clink-args=-fuse-ld=gold" // FIXME, Why was there a comma at the start?
     } else {
@@ -30,7 +41,7 @@ fn main() {
         .profile_generate(&path_prof_data_dir)
         .opt()
         .run();
-    run("main aaaaaaaaaaaa2bbbbbbbbbbbb2bbbbbbbbbbbbbbbbcc"); // FIXME, with an arg? How to pass it?
+    run("main");
     llvm_profdata().merge().output(&path_merged_profdata).input(path_prof_data_dir).command_output();
     rustc().arg(common_flags)
         .input("interesting.rs")
@@ -39,6 +50,25 @@ fn main() {
         .codegen_units(1)
         .emit("llvm-ir")
         .run();
-    // FIXME, implement cat
+
+    // FIXME This part below is a rough attempt
+
+    let interesting_ll = tmp_dir().join("interesting.ll");
+    let file_interesting_ll = File::open(interesting_ll)?;
+    let reader = BufReader::new(file_interesting_ll);
+
+    let mut child = Command::new("llvm-filecheck")
+       .stdin(std::process::Stdio::piped())
+       .stdout(std::process::Stdio::piped())
+       .stderr(std::process::Stdio::piped())
+       .arg("filecheck-patterns.txt")
+       .spawn()
+       .unwrap();
+    
+    let mut child_stdin = child.stdin.take().unwrap();
+    child_stdin.write_all(reader.bytes().collect::<Vec<_>>().as_slice()).unwrap();
+    child_stdin.flush().unwrap();
+
+    let output = child.wait_with_output().unwrap();
 }