winch: Fix retrieving function signature for compilation (#5725)

This commit fixes an incorrect usage of `func_type_at` to retrieve a defined
function signature and instead uses `function_at` to retrieve the signature.

Additionally it enhances `winch-tools` `compile` and `test` commands to handle
modules with multiple functions correctly.

Author: saulecabrera

winch/filetests/src/lib.rs

@@ -112,9 +112,9 @@ mod test {
 
         let binding = body_inputs
             .into_iter()
-            .flat_map(|func| compile(&*isa, module, types, func))
+            .map(|func| compile(&*isa, module, types, func).join("\n"))
             .collect::<Vec<String>>()
-            .join("\n");
+            .join("\n\n");
         let actual = binding.as_str();
 
         if std::env::var("WINCH_TEST_BLESS").unwrap_or_default() == "1" {
@@ -151,7 +151,7 @@ mod test {
     ) -> Vec<String> {
         let index = module.func_index(f.0);
         let sig = types
-            .func_type_at(index.as_u32())
+            .function_at(index.as_u32())
             .expect(&format!("function type at index {:?}", index.as_u32()));
         let FunctionBodyData { body, validator } = f.1;
         let validator = validator.into_validator(Default::default());

winch/src/compile.rs

@@ -56,14 +56,15 @@ fn compile(
 ) -> Result<()> {
     let index = module.func_index(f.0);
     let sig = types
-        .func_type_at(index.as_u32())
+        .function_at(index.as_u32())
         .expect(&format!("function type at index {:?}", index.as_u32()));
     let FunctionBodyData { body, validator } = f.1;
     let validator = validator.into_validator(Default::default());
     let buffer = isa
         .compile_function(&sig, &body, validator)
         .expect("Couldn't compile function");
 
+    println!("Disassembly for function: {}", index.as_u32());
     disasm(buffer.data(), isa)?
         .iter()
         .for_each(|s| println!("{}", s));