From 8d8d48f669f55ed43ebba87dbd146cb59c8d0fc3 Mon Sep 17 00:00:00 2001
From: NikVolf <nikvolf@gmail.com>
Date: Fri, 30 Nov 2018 15:57:34 +0300
Subject: [PATCH] show function signature and code example

---
 examples/show.rs | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 examples/show.rs

diff --git a/examples/show.rs b/examples/show.rs
new file mode 100644
index 0000000..d426081
--- /dev/null
+++ b/examples/show.rs
@@ -0,0 +1,36 @@
+extern crate parity_wasm;
+
+use std::env;
+
+fn main() {
+	let args = env::args().collect::<Vec<_>>();
+	if args.len() != 3 {
+		println!("Usage: {} <wasm file> <index of function>", args[0]);
+		return;
+	}
+
+	let module = parity_wasm::deserialize_file(&args[1]).expect("Failed to load module");
+	let function_index = args[2].parse::<usize>().expect("Failed to parse function index");
+
+	if module.code_section().is_none() {
+		println!("no code in module!");
+		std::process::exit(1);
+	}
+
+	let sig = match module.function_section().unwrap().entries().get(function_index) {
+		Some(s) => s,
+		None => {
+			println!("no such function in module!");
+			std::process::exit(1)
+		}
+	};
+
+	let sig_type = &module.type_section().expect("No type section: module malformed").types()[sig.type_ref() as usize];
+	let code = &module.code_section().expect("Already checked, impossible").bodies()[function_index];
+
+	println!("signature: {:?}", sig_type);
+	println!("code: ");
+	for instruction in code.code().elements() {
+		println!("{}", instruction);
+	}
+}
\ No newline at end of file