feat(profiling-replayer): add the ability to print stacks

profiling-replayer/src/main.rs

@@ -121,6 +121,13 @@ fn main() -> anyhow::Result<()> {
                 .help("collect memory statistics")
                 .required(false),
         )
+        .arg(
+            Arg::new("print-samples")
+                .long("print-samples")
+                .help("verbose printing of the stacks")
+                .required(false)
+                .num_args(0),
+        )
         .arg(
             Arg::new("output")
                 .short('o')
@@ -131,6 +138,7 @@ fn main() -> anyhow::Result<()> {
 
     let input = matches.get_one::<String>("input").unwrap();
     let output = matches.get_one::<String>("output");
+    let print_stacks = matches.get_one("print-samples");
     let collect_memory_stats = matches.get_flag("mem");
     let mut sysinfo = if collect_memory_stats {
         Some(Sysinfo::new())
@@ -174,6 +182,18 @@ fn main() -> anyhow::Result<()> {
         println!("Max stack depth is {max}.");
     }
 
+    if let Some(true) = print_stacks {
+        for (_tstamp, sample) in replayer.samples.iter() {
+            sample.locations.iter().rev().for_each(|location| {
+                let fname = location.function.name;
+                let lineno = location.line;
+                let filename = location.function.filename;
+                println!("{fname}:{lineno} ({filename})");
+            });
+            println!();
+        }
+    }
+
     // When benchmarking, don't count the copying of the stacks, do that before.
     let samples = std::mem::take(&mut replayer.samples);