update

Cargo.lock

@@ -185,7 +185,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "078775d0255232fb988e6fccf26ddc9d1ac274299aaedcedce21c6f72cc533ce"
 
 [[package]]
-name = "wasmer-interface-types"
+name = "wasmer-interface-types-fl"
 version = "0.17.0"
 dependencies = [
  "nom",

Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "wasmer-interface-types"
+name = "wasmer-interface-types-fl"
 version = "0.17.0"
 description = "WebAssembly Interface Types library for Wasmer"
 license = "MIT"

src/ast.rs

@@ -26,11 +26,18 @@ pub enum Type {
     /// (@interface type (func (param i32 i32) (result string)))
     /// ```
     Function {
+        /// Name of a function.
+        name: String,
+
         /// Types for the parameters (`(param …)`).
-        inputs: Vec<InterfaceType>,
+        arg_types: Vec<InterfaceType>,
+
+        /// Name of function argument types.
+        // TODO: introduce a struct combines name and type of a field
+        arg_names: Vec<String>,
 
         /// Types for the results (`(result …)`).
-        outputs: Vec<InterfaceType>,
+        output_types: Vec<InterfaceType>,
     },
 
     /// A record type, like:

src/decoders/binary.rs

@@ -121,7 +121,7 @@ fn record_type<'input, E: ParseError<&'input [u8]>>(
     ))
 }
 
-/// Parse a UTF-8 string.
+/// Parse a UTF-8 string into &str.
 fn string<'input, E: ParseError<&'input [u8]>>(
     input: &'input [u8],
 ) -> IResult<&'input [u8], &'input str, E> {
@@ -143,6 +143,28 @@ fn string<'input, E: ParseError<&'input [u8]>>(
     ))
 }
 
+/// Parse a UTF-8 string into String.
+fn owned_string<'input, E: ParseError<&'input [u8]>>(
+    input: &'input [u8],
+) -> IResult<&'input [u8], String, E> {
+    if input.is_empty() {
+        return Err(Err::Error(make_error(input, ErrorKind::Eof)));
+    }
+
+    let length = input[0] as usize;
+    let input = &input[1..];
+
+    if input.len() < length {
+        return Err(Err::Error(make_error(input, ErrorKind::Eof)));
+    }
+
+    Ok((
+        &input[length..],
+        String::from_utf8(input[..length].to_vec())
+            .map_err(|_| Err::Error(make_error(input, ErrorKind::ParseTo)))?,
+    ))
+}
+
 /// Parse a list, with an item parser.
 #[allow(clippy::type_complexity)]
 fn list<'input, I, E: ParseError<&'input [u8]>>(
@@ -306,10 +328,17 @@ fn types<'input, E: ParseError<&'input [u8]>>(
 
         match type_kind {
             TypeKind::Function => {
-                consume!((input, inputs) = list(input, ty)?);
-                consume!((input, outputs) = list(input, ty)?);
+                consume!((input, name) = string(input)?);
+                consume!((input, arg_types) = list(input, ty)?);
+                consume!((input, arg_names) = list(input, owned_string)?);
+                consume!((input, output_types) = list(input, ty)?);
 
-                types.push(Type::Function { inputs, outputs });
+                types.push(Type::Function {
+                    name: String::from(name),
+                    arg_types,
+                    arg_names,
+                    output_types,
+                });
             }
 
             TypeKind::Record => {

src/decoders/wat.rs

@@ -403,7 +403,7 @@ impl Parse<'_> for AtInterface {
 
 #[derive(PartialEq, Debug)]
 enum FunctionType {
-    Input(Vec<InterfaceType>),
+    Header(String, Vec<String>, Vec<InterfaceType>),
     Output(Vec<InterfaceType>),
 }
 
@@ -414,14 +414,17 @@ impl Parse<'_> for FunctionType {
 
             if lookahead.peek::<keyword::param>() {
                 parser.parse::<keyword::param>()?;
+                let func_name = parser.parse()?;
 
-                let mut inputs = vec![];
+                let mut names = vec![];
+                let mut types = vec![];
 
                 while !parser.is_empty() {
-                    inputs.push(parser.parse()?);
+                    names.push(parser.parse()?);
+                    types.push(parser.parse()?);
                 }
 
-                Ok(FunctionType::Input(inputs))
+                Ok(FunctionType::Header(func_name, names, types))
             } else if lookahead.peek::<keyword::result>() {
                 parser.parse::<keyword::result>()?;
 
@@ -488,21 +491,39 @@ impl<'a> Parse<'a> for Type {
             if lookahead.peek::<keyword::func>() {
                 parser.parse::<keyword::func>()?;
 
-                let mut input_types = vec![];
+                let mut arg_types = vec![];
+                let mut arg_names = vec![];
                 let mut output_types = vec![];
+                let mut name: Option<String> = None;
 
                 while !parser.is_empty() {
                     let function_type = parser.parse::<FunctionType>()?;
 
                     match function_type {
-                        FunctionType::Input(mut inputs) => input_types.append(&mut inputs),
+                        FunctionType::Header(func_name, mut names, mut types) => {
+                            name = Some(func_name);
+                            arg_names.append(&mut names);
+                            arg_types.append(&mut types);
+                        },
                         FunctionType::Output(mut outputs) => output_types.append(&mut outputs),
                     }
                 }
 
+                if name.is_none() {
+                    return Err(parser.error("Malformed wast: function doesn't contain name"));
+                }
+
+                if arg_types.len() != arg_names.len() {
+                    return Err(parser.error("Malformed wast: function argument types count should be equal to argument names count"));
+                }
+
+                // It's has been already checked for None.
+                let name = name.unwrap();
                 Ok(Type::Function {
-                    inputs: input_types,
-                    outputs: output_types,
+                    name,
+                    arg_types,
+                    arg_names,
+                    output_types,
                 })
             } else if lookahead.peek::<keyword::record>() {
                 Ok(Type::Record(parser.parse()?))
@@ -874,7 +895,7 @@ mod tests {
     #[test]
     fn test_param_empty() {
         let input = buffer("(param)");
-        let output = FunctionType::Input(vec![]);
+        let output = FunctionType::InputTypes(vec![]);
 
         assert_eq!(parser::parse::<FunctionType>(&input).unwrap(), output);
     }
@@ -882,7 +903,7 @@ mod tests {
     #[test]
     fn test_param() {
         let input = buffer("(param i32 string)");
-        let output = FunctionType::Input(vec![InterfaceType::I32, InterfaceType::String]);
+        let output = FunctionType::InputTypes(vec![InterfaceType::I32, InterfaceType::String]);
 
         assert_eq!(parser::parse::<FunctionType>(&input).unwrap(), output);
     }

src/encoders/binary.rs

@@ -66,6 +66,24 @@ where
     }
 }
 
+/// Encode a String into bytes.
+///
+/// Decoder is `decoders::binary::string`.
+impl<W> ToBytes<W> for String
+where
+    W: Write,
+{
+    fn to_bytes(&self, writer: &mut W) -> io::Result<()> {
+        // Size first.
+        writer.write_all(&[self.len() as u8])?;
+
+        // Then the string.
+        writer.write_all(self.as_bytes())?;
+
+        Ok(())
+    }
+}
+
 /// Encode a vector into bytes.
 ///
 /// Decoder is `decoders::binary::list`.
@@ -165,10 +183,17 @@ where
 {
     fn to_bytes(&self, writer: &mut W) -> io::Result<()> {
         match self {
-            Type::Function { inputs, outputs } => {
+            Type::Function {
+                name,
+                arg_types,
+                arg_names,
+                output_types,
+            } => {
                 TypeKind::Function.to_bytes(writer)?;
-                inputs.to_bytes(writer)?;
-                outputs.to_bytes(writer)?;
+                name.to_bytes(writer)?;
+                arg_types.to_bytes(writer)?;
+                arg_names.to_bytes(writer)?;
+                output_types.to_bytes(writer)?;
             }
 
             Type::Record(record_type) => {

src/encoders/wat.rs

@@ -158,19 +158,23 @@ impl ToString for &Instruction {
 
 /// Encode a list of `InterfaceType` representing inputs into a
 /// string.
-fn input_types_to_param(input_types: &[InterfaceType]) -> String {
-    if input_types.is_empty() {
-        "".into()
+fn encode_arguments(arg_types: &[InterfaceType], arg_names: &[String]) -> String {
+    // here we know that arg_names and arg_types have the same length
+    if arg_names.is_empty() {
+        String::from("")
     } else {
         format!(
             "\n  (param{})",
-            input_types
-                .iter()
-                .fold(String::new(), |mut accumulator, interface_type| {
+            arg_names.iter().zip(arg_types.iter()).fold(
+                String::new(),
+                |mut accumulator, (name, ty)| {
                     accumulator.push(' ');
-                    accumulator.push_str(&interface_type.to_string());
+                    accumulator.push_str(name);
+                    accumulator.push_str(": ");
+                    accumulator.push_str(&ty.to_string());
                     accumulator
-                })
+                }
+            )
         )
     }
 }
@@ -198,10 +202,16 @@ fn output_types_to_result(output_types: &[InterfaceType]) -> String {
 impl<'input> ToString for &Type {
     fn to_string(&self) -> String {
         match self {
-            Type::Function { inputs, outputs } => format!(
-                r#"(@interface type (func{inputs}{outputs}))"#,
-                inputs = input_types_to_param(&inputs),
-                outputs = output_types_to_result(&outputs),
+            Type::Function {
+                name,
+                arg_types,
+                arg_names,
+                output_types,
+            } => format!(
+                r#"(@interface type (func {name} {args}{output_types}))"#,
+                name = name,
+                args = encode_arguments(arg_types, arg_names),
+                output_types = output_types_to_result(&output_types),
             ),
 
             Type::Record(record_type) => format!(