[profiler] handle /TestBench/profData hierarchy

profiler/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "profiler"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow = "1.0.87"
+clap = { version = "4.5.17", features = ["derive"] }
+vcd = "0.7.0"

profiler/src/main.rs

@@ -0,0 +1,36 @@
+use std::{fs::File, io::BufReader, path::PathBuf};
+
+use anyhow::anyhow;
+use clap::Parser;
+use vcd::ScopeItem;
+
+#[derive(Parser)]
+struct Cli {
+    input_vcd: PathBuf,
+}
+
+fn main() -> anyhow::Result<()> {
+    let cli = Cli::parse();
+
+    let input = File::open(cli.input_vcd)?;
+
+    let mut input = vcd::Parser::new(BufReader::new(input));
+    let header = input.parse_header()?;
+
+    let prof_data = header
+        .find_scope(&["TestBench", "profData"])
+        .ok_or_else(|| anyhow!("can not find scope /TestBench/profData"))?;
+
+    for item in &prof_data.items {
+        match item {
+            ScopeItem::Var(var) => {
+                let name = &var.reference;
+                let width = var.size;
+                println!("- {name} : bit({width})");
+            }
+            _ => {}
+        }
+    }
+
+    Ok(())
+}