section-mangler: Add prefix constant, derive Debug and PartialEq

compiler/section_mangler/src/lib.rs

@@ -49,17 +49,20 @@ mod parser;
 /// The main builder type of this crate. Use it to create mangling contexts, in
 /// order to encode and decode binary type information.
 // TODO: Add example code for using this builder
+#[derive(Debug, PartialEq)]
 pub enum SectionMangler {
     Function(FunctionMangler),
     Variable(VariableMangler),
 }
 
+#[derive(Debug, PartialEq)]
 pub struct FunctionMangler {
     name: String,
     parameters: Vec<FunctionArgument>,
     return_type: Option<Type>,
 }
 
+#[derive(Debug, PartialEq)]
 pub struct VariableMangler {
     name: String,
     ty: Type,
@@ -113,6 +116,7 @@ impl SectionMangler {
 // NOTE: This is called `variable_linkage` in the `MemberInfo` struct.
 
 /// We have to encode this because if it changes, the function needs to be reloaded - this is an ABI breakage
+#[derive(Debug, PartialEq)]
 pub enum FunctionArgument {
     ByValue(Type),
     ByRef(Type),
@@ -129,6 +133,7 @@ impl fmt::Display for FunctionArgument {
 }
 
 // TODO: Do we have to encode this? Does that affect ABI? Probably
+#[derive(Debug, PartialEq)]
 pub enum StringEncoding {
     // TODO: Should we encode this differently? this could cause problems compared to encoding unsigned types
     /// Encoded as `8u`
@@ -148,6 +153,7 @@ impl fmt::Display for StringEncoding {
 
 // This maps directly to the [`DataTypeInformation`] enum in RuSTy - we simply remove some fields and add the ability to encode/decode serialize/deserialize
 // TODO: Do we have to handle Generic?
+#[derive(Debug, PartialEq)]
 pub enum Type {
     /// Encoded as `v`
     Void,
@@ -237,16 +243,18 @@ impl fmt::Display for Type {
     }
 }
 
+pub const PREFIX: &str = "$RUSTY$";
+
 // TODO: How to encode variadics?
 fn mangle_function(FunctionMangler { name, parameters, return_type }: FunctionMangler) -> String {
     let mangled = parameters
         .into_iter()
         /* FIXME: Is that correct? */
         .fold(return_type.unwrap_or(Type::Void).to_string(), |mangled, arg| format!("{mangled}[{arg}]"));
 
-    format!("{name}:{mangled}")
+    format!("{PREFIX}{name}:{mangled}")
 }
 
 fn mangle_variable(VariableMangler { name, ty }: VariableMangler) -> String {
-    format!("{name}:{ty}")
+    format!("{PREFIX}{name}:{ty}")
 }

compiler/section_mangler/src/parser.rs

@@ -18,6 +18,7 @@ fn parse_prefix(input: &str) -> ParseResult<Prefix> {
     let fn_prefix = tag("fn").map(|_| Prefix::Fn);
     let var_prefix = tag("var").map(|_| Prefix::Var);
 
+    let (input, _) = tag(crate::PREFIX)(input)?;
     let (input, prefix) = alt((fn_prefix, var_prefix))(input)?;
 
     Ok((input, prefix))
@@ -87,8 +88,12 @@ mod tests {
 
     #[test]
     fn parse_prefix_valid() {
-        assert!(parse_prefix("fn").is_ok());
-        assert!(parse_prefix("var").is_ok());
+        assert!(parse_prefix("$RUSTY$fn").is_ok());
+        assert!(parse_prefix("$RUSTY$var").is_ok());
+
+        assert!(parse_prefix("$RUSTY$random").is_err());
+        assert!(parse_prefix("fn").is_err());
+        assert!(parse_prefix("var").is_err());
 
         assert!(parse_prefix("").is_err());
         assert!(parse_prefix("a random prefix").is_err());
@@ -138,4 +143,9 @@ mod tests {
         assert!(type_pointer("p").is_err());
         assert!(type_pointer("i0").is_err());
     }
+
+    #[test]
+    fn parse_variable() {
+        SectionMangler::from("$RUSTY$var-name:u8");
+    }
 }