From dfc94311dd9a0e5b48971caf39d5cbb481b5dd77 Mon Sep 17 00:00:00 2001
From: silur <silur@cryptall.co>
Date: Tue, 30 Nov 2021 00:01:25 +0100
Subject: [PATCH] get function/export names from wasm

---
 Cargo.toml |  1 +
 src/lib.rs | 38 +++++++++++++-------------------------
 2 files changed, 14 insertions(+), 25 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 5c22fc4..43b0854 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,3 +9,4 @@ edition = "2021"
 wasmi = "0.9.1"
 wabt = "0.10.0"
 clap = "3.0.0-beta.2"
+parity-wasm = "0.42.2"
diff --git a/src/lib.rs b/src/lib.rs
index b5d74d8..d6e97f9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,13 +8,16 @@ fn mutate() -> Vec<u8> {
     unimplemented!();
 }
 
+fn parse_expr(expr: Vec<u8>) -> Vec<u8> {
+    unimplemented!();
+}
+
 fn asd() {
-    // Parse WAT (WebAssembly Text format) into wasm bytecode.
     let wasm_binary: Vec<u8> =
         wabt::wat2wasm(
             r#"
             (module
-                (func (export "test") (result i32)
+                (func (export "test") (param i32) (result i32)
                     i32.const 1337
                 )
             )
@@ -22,30 +25,15 @@ fn asd() {
         )
         .expect("failed to parse wat");
 
-    // Load wasm binary and prepare it for instantiation.
-    let module = wasmi::Module::from_buffer(&wasm_binary)
+    let module = parity_wasm::elements::Module::from_bytes(&wasm_binary)
         .expect("failed to load wasm");
-
-    // Instantiate a module with empty imports and
-    // assert that there is no `start` function.
-    let instance =
-        ModuleInstance::new(
-            &module,
-            &ImportsBuilder::default()
-        )
-        .expect("failed to instantiate wasm module")
-        .assert_no_start();
-
-    // Finally, invoke the exported function "test" with no parameters
-    // and empty external function executor.
-    assert_eq!(
-        instance.invoke_export(
-            "test",
-            &[],
-            &mut NopExternals,
-        ).expect("failed to execute export"),
-        Some(RuntimeValue::I32(1337)),
-    );
+    
+    for (export, function) in module.export_section().unwrap().entries().iter()
+    .zip(module.function_section().unwrap().entries().iter()) {
+        let func_body: parity_wasm::elements::FuncBody =
+            function.try_into().unwrap();
+        println!("{} - {:?}", export.field(), function);
+    }
 }
 
 #[cfg(test)]