Add renaming of conflicting constructors and operations (#579)

* Add renaming of conflicting constructors and operations

* Rename conflicting to overloaded

* Fix newlines

* Use or_insert_with, add a comment to TypeToString

* Use more Rust-like names

* Use opt instead of nullable

* Use argument names instead of argument types if possible

* Drop new for overloaded constructots

* Remove extra newline

* Move WebIDL files from unavailable_overloaded_fn

* Move RTCDataChannel, RTCPeerConnection and Selection to unavailable_option_primitive

crates/web-sys/webidls/enabled/IDBKeyRange.webidl

@@ -20,7 +20,7 @@ interface IDBKeyRange {
   [Constant]
   readonly attribute boolean upperOpen;
   [Throws]
-  boolean includes(any key);
+  boolean _includes(any key);
 
 
   [NewObject, Throws]

crates/web-sys/webidls/unavailable_overloaded_fn/README.md

@@ -1,2 +0,0 @@
-These webidl files are unavailable because they have multiple functions with the same name and
-different arguments (overloaded functions), and web-sys does not support these.

crates/webidl/src/first_pass.rs

@@ -18,13 +18,34 @@ use super::Result;
 /// Collection of constructs that may use partial.
 #[derive(Default)]
 pub(crate) struct FirstPassRecord<'a> {
-    pub(crate) interfaces: BTreeSet<String>,
+    pub(crate) interfaces: BTreeMap<String, InterfaceData>,
     pub(crate) dictionaries: BTreeSet<String>,
     pub(crate) enums: BTreeSet<String>,
     /// The mixins, mapping their name to the webidl ast node for the mixin.
     pub(crate) mixins: BTreeMap<String, MixinData<'a>>,
 }
 
+/// We need to collect interface data during the first pass, to be used later.
+#[derive(Default)]
+pub(crate) struct InterfaceData {
+    /// Whether only partial interfaces were encountered
+    pub(crate) partial: bool,
+    pub(crate) operations: BTreeMap<OperationId, OperationData>,
+}
+
+#[derive(PartialEq, Eq, PartialOrd, Ord)]
+pub(crate) enum OperationId {
+    Constructor,
+    Operation(Option<String>)
+}
+
+#[derive(Default)]
+pub(crate) struct OperationData {
+    pub(crate) overloaded: bool,
+    /// Map from argument names to whether they are the same for multiple overloads
+    pub(crate) argument_names_same: BTreeMap<Vec<String>, bool>,
+}
+
 /// We need to collect mixin data during the first pass, to be used later.
 #[derive(Default)]
 pub(crate) struct MixinData<'a> {
@@ -37,30 +58,30 @@ pub(crate) struct MixinData<'a> {
 }
 
 /// Implemented on an AST node to populate the `FirstPassRecord` struct.
-pub(crate) trait FirstPass {
+pub(crate) trait FirstPass<Ctx> {
     /// Populate `record` with any constructs in `self`.
-    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>) -> Result<()>;
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, ctx: Ctx) -> Result<()>;
 }
 
-impl FirstPass for [webidl::ast::Definition] {
+impl FirstPass<()> for [webidl::ast::Definition] {
-    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>) -> Result<()> {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, (): ()) -> Result<()> {
         for def in self {
-            def.first_pass(record)?;
+            def.first_pass(record, ())?;
         }
 
         Ok(())
     }
 }
 
-impl FirstPass for webidl::ast::Definition {
+impl FirstPass<()> for webidl::ast::Definition {
-    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>) -> Result<()> {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, (): ()) -> Result<()> {
         use webidl::ast::Definition::*;
 
         match self {
-            Dictionary(dictionary) => dictionary.first_pass(record),
+            Dictionary(dictionary) => dictionary.first_pass(record, ()),
-            Enum(enum_) => enum_.first_pass(record),
+            Enum(enum_) => enum_.first_pass(record, ()),
-            Interface(interface) => interface.first_pass(record),
+            Interface(interface) => interface.first_pass(record, ()),
-            Mixin(mixin) => mixin.first_pass(record),
+            Mixin(mixin) => mixin.first_pass(record, ()),
             _ => {
                 // Other definitions aren't currently used in the first pass
                 Ok(())
@@ -69,12 +90,12 @@ impl FirstPass for webidl::ast::Definition {
     }
 }
 
-impl FirstPass for webidl::ast::Dictionary {
+impl FirstPass<()> for webidl::ast::Dictionary {
-    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>) -> Result<()> {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, (): ()) -> Result<()> {
         use webidl::ast::Dictionary::*;
 
         match self {
-            NonPartial(dictionary) => dictionary.first_pass(record),
+            NonPartial(dictionary) => dictionary.first_pass(record, ()),
             _ => {
                 // Other dictionaries aren't currently used in the first pass
                 Ok(())
@@ -83,8 +104,8 @@ impl FirstPass for webidl::ast::Dictionary {
     }
 }
 
-impl FirstPass for webidl::ast::NonPartialDictionary {
+impl FirstPass<()> for webidl::ast::NonPartialDictionary {
-    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>) -> Result<()> {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, (): ()) -> Result<()> {
         if record.dictionaries.insert(self.name.clone()) {
             warn!("Encountered multiple declarations of {}", self.name);
         }
@@ -93,8 +114,8 @@ impl FirstPass for webidl::ast::NonPartialDictionary {
     }
 }
 
-impl FirstPass for webidl::ast::Enum {
+impl FirstPass<()> for webidl::ast::Enum {
-    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>) -> Result<()> {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, (): ()) -> Result<()> {
         if record.enums.insert(self.name.clone()) {
             warn!("Encountered multiple declarations of {}", self.name);
         }
@@ -103,43 +124,212 @@ impl FirstPass for webidl::ast::Enum {
     }
 }
 
-impl FirstPass for webidl::ast::Interface {
+fn first_pass_operation<'a>(
-    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>) -> Result<()> {
+    record: &mut FirstPassRecord<'a>,
+    self_name: &str,
+    id: OperationId,
+    arguments: &[webidl::ast::Argument],
+)  -> Result<()> {
+    record
+        .interfaces
+        .get_mut(self_name)
+        .unwrap()
+        .operations
+        .entry(id)
+        .and_modify(|operation_data| operation_data.overloaded = true)
+        .or_insert_with(||
+            OperationData {
+                overloaded: false,
+                argument_names_same: Default::default(),
+            }
+        )
+        .argument_names_same
+        .entry(arguments.iter().map(|argument| argument.name.clone()).collect())
+        .and_modify(|same_argument_names| *same_argument_names = true)
+        .or_insert(false);
+
+    Ok(())
+}
+
+impl FirstPass<()> for webidl::ast::Interface {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, (): ()) -> Result<()> {
         use webidl::ast::Interface::*;
 
         match self {
-            NonPartial(interface) => interface.first_pass(record),
+            Partial(interface) => interface.first_pass(record, ()),
-            _ => {
+            NonPartial(interface) => interface.first_pass(record, ()),
-                // Other interfaces aren't currently used in the first pass
+            // TODO
+            Callback(..) => {
+                warn!("Unsupported WebIDL interface: {:?}", self);
                 Ok(())
             }
         }
     }
 }
 
-impl FirstPass for webidl::ast::NonPartialInterface {
+impl FirstPass<()> for webidl::ast::NonPartialInterface {
-    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>) -> Result<()> {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, (): ()) -> Result<()> {
-        if record.interfaces.insert(self.name.clone()) {
+        record
-            warn!("Encountered multiple declarations of {}", self.name);
+            .interfaces
+            .entry(self.name.clone())
+            .and_modify(|interface_data| {
+                if interface_data.partial {
+                    interface_data.partial = false;
+                } else {
+                    warn!("Encountered multiple declarations of {}", self.name);
+                }
+            })
+            .or_insert_with(||
+                InterfaceData {
+                    partial: false,
+                    operations: Default::default(),
+                },
+            );
+
+        if ::util::is_chrome_only(&self.extended_attributes) {
+            return Ok(())
+        }
+
+        for extended_attribute in &self.extended_attributes {
+            extended_attribute.first_pass(record, &self.name)?;
+        }
+
+        for member in &self.members {
+            member.first_pass(record, &self.name)?;
         }
 
         Ok(())
     }
 }
 
-impl FirstPass for webidl::ast::Mixin {
+impl FirstPass<()> for webidl::ast::PartialInterface {
-    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>) -> Result<()> {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, (): ()) -> Result<()> {
-        use webidl::ast::Mixin::*;
+        record
+            .interfaces
+            .entry(self.name.clone())
+            .or_insert_with(||
+                InterfaceData {
+                    partial: true,
+                    operations: Default::default(),
+                },
+            );
 
+        if ::util::is_chrome_only(&self.extended_attributes) {
+            return Ok(())
+        }
+
+        for member in &self.members {
+            member.first_pass(record, &self.name)?;
+        }
+
+        Ok(())
+    }
+}
+
+impl<'b> FirstPass<&'b str> for webidl::ast::ExtendedAttribute {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, self_name: &'b str) -> Result<()> {
         match self {
-            NonPartial(mixin) => mixin.first_pass(record),
+            webidl::ast::ExtendedAttribute::ArgumentList(
-            Partial(mixin) => mixin.first_pass(record),
+                webidl::ast::ArgumentListExtendedAttribute { arguments, name },
+            )
+            if name == "Constructor" =>
+                {
+                    first_pass_operation(
+                        record,
+                        self_name,
+                        OperationId::Constructor,
+                        &arguments,
+                    )
+                }
+            webidl::ast::ExtendedAttribute::NoArguments(webidl::ast::Other::Identifier(name))
+            if name == "Constructor" =>
+                {
+                    first_pass_operation(
+                        record,
+                        self_name,
+                        OperationId::Constructor,
+                        &[],
+                    )
+                }
+            webidl::ast::ExtendedAttribute::NamedArgumentList(
+                webidl::ast::NamedArgumentListExtendedAttribute {
+                    lhs_name,
+                    rhs_arguments,
+                    ..
+                },
+            )
+            if lhs_name == "NamedConstructor" =>
+                {
+                    first_pass_operation(
+                        record,
+                        self_name,
+                        OperationId::Constructor,
+                        &rhs_arguments,
+                    )
+                },
+            _ => Ok(())
         }
     }
 }
 
-impl FirstPass for webidl::ast::NonPartialMixin {
+impl<'b> FirstPass<&'b str> for webidl::ast::InterfaceMember {
-    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>) -> Result<()> {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, self_name: &'b str) -> Result<()> {
+        match self {
+            webidl::ast::InterfaceMember::Operation(op) => op.first_pass(record, self_name),
+            _ => Ok(()),
+        }
+    }
+}
+
+impl<'b> FirstPass<&'b str> for webidl::ast::Operation {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, self_name: &'b str) -> Result<()> {
+        match self {
+            webidl::ast::Operation::Regular(op) => op.first_pass(record, self_name),
+            webidl::ast::Operation::Static(op) => op.first_pass(record, self_name),
+            // TODO
+            webidl::ast::Operation::Special(_) | webidl::ast::Operation::Stringifier(_) => {
+                warn!("Unsupported WebIDL operation: {:?}", self);
+                Ok(())
+            }
+        }
+    }
+}
+
+impl<'b> FirstPass<&'b str> for webidl::ast::RegularOperation {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, self_name: &'b str) -> Result<()> {
+        first_pass_operation(
+            record,
+            self_name,
+            OperationId::Operation(self.name.clone()),
+            &self.arguments,
+        )
+    }
+}
+
+impl<'b> FirstPass<&'b str> for webidl::ast::StaticOperation {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, self_name: &'b str) -> Result<()> {
+        first_pass_operation(
+            record,
+            self_name,
+            OperationId::Operation(self.name.clone()),
+            &self.arguments,
+        )
+    }
+}
+
+impl FirstPass<()> for webidl::ast::Mixin {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, (): ()) -> Result<()> {
+        use webidl::ast::Mixin::*;
+
+        match self {
+            NonPartial(mixin) => mixin.first_pass(record, ()),
+            Partial(mixin) => mixin.first_pass(record, ()),
+        }
+    }
+}
+
+impl FirstPass<()> for webidl::ast::NonPartialMixin {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, (): ()) -> Result<()> {
         let entry = record
             .mixins
             .entry(self.name.clone())
@@ -155,8 +345,8 @@ impl FirstPass for webidl::ast::NonPartialMixin {
     }
 }
 
-impl FirstPass for webidl::ast::PartialMixin {
+impl FirstPass<()> for webidl::ast::PartialMixin {
-    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>) -> Result<()> {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, (): ()) -> Result<()> {
         let entry = record
             .mixins
             .entry(self.name.clone())

crates/webidl/src/lib.rs

@@ -75,7 +75,7 @@ fn parse(webidl_source: &str) -> Result<backend::ast::Program> {
     };
 
     let mut first_pass_record = Default::default();
-    definitions.first_pass(&mut first_pass_record)?;
+    definitions.first_pass(&mut first_pass_record, ())?;
     let mut program = Default::default();
     definitions.webidl_parse(&mut program, &first_pass_record, ())?;
 
@@ -309,7 +309,7 @@ impl WebidlParse<()> for webidl::ast::PartialInterface {
             return Ok(());
         }
 
-        if !first_pass.interfaces.contains(&self.name) {
+        if !first_pass.interfaces.contains_key(&self.name) {
             warn!(
                 "Partial interface {} missing non-partial interface",
                 self.name
@@ -332,6 +332,12 @@ impl<'a> WebidlParse<&'a webidl::ast::NonPartialInterface> for webidl::ast::Exte
         interface: &'a webidl::ast::NonPartialInterface,
     ) -> Result<()> {
         let mut add_constructor = |arguments: &[webidl::ast::Argument], class: &str| {
+            let (overloaded, same_argument_names) = first_pass.get_operation_overloading(
+                arguments,
+                ::first_pass::OperationId::Constructor,
+                &interface.name,
+            );
+
             let self_ty = ident_ty(rust_ident(camel_case_ident(&interface.name).as_str()));
 
             let kind = backend::ast::ImportFunctionKind::Method {
@@ -359,6 +365,8 @@ impl<'a> WebidlParse<&'a webidl::ast::NonPartialInterface> for webidl::ast::Exte
             first_pass
                 .create_function(
                     "new",
+                    overloaded,
+                    same_argument_names,
                     arguments
                         .iter()
                         .map(|arg| (&*arg.name, &*arg.type_, arg.variadic)),

crates/webidl/src/util.rs

@@ -142,6 +142,92 @@ pub enum TypePosition {
     Return,
 }
 
+/// Implemented on an AST type node to generate a snake case name.
+trait TypeToString {
+    fn type_to_string(&self) -> String;
+}
+
+impl TypeToString for webidl::ast::Type {
+    fn type_to_string(&self) -> String {
+        if self.nullable {
+            "opt_".to_owned() + &self.kind.type_to_string()
+        } else {
+            self.kind.type_to_string()
+        }
+    }
+}
+
+impl TypeToString for webidl::ast::ReturnType {
+    fn type_to_string(&self) -> String {
+        match self {
+            webidl::ast::ReturnType::NonVoid(ty) => (*ty).type_to_string(),
+            webidl::ast::ReturnType::Void => "void".to_owned(),
+        }
+    }
+}
+
+impl TypeToString for webidl::ast::StringType {
+    fn type_to_string(&self) -> String {
+        match self {
+            webidl::ast::StringType::ByteString => "byte_str".to_owned(),
+            webidl::ast::StringType::DOMString => "dom_str".to_owned(),
+            webidl::ast::StringType::USVString => "usv_str".to_owned(),
+        }
+    }
+}
+
+impl TypeToString for webidl::ast::TypeKind {
+    fn type_to_string(&self) -> String {
+        match self {
+            webidl::ast::TypeKind::Any => "any".to_owned(),
+            webidl::ast::TypeKind::ArrayBuffer => "array_buffer".to_owned(),
+            webidl::ast::TypeKind::Boolean => "bool".to_owned(),
+            webidl::ast::TypeKind::Byte => "i8".to_owned(),
+            webidl::ast::TypeKind::ByteString => "byte_str".to_owned(),
+            webidl::ast::TypeKind::DOMString => "dom_str".to_owned(),
+            webidl::ast::TypeKind::DataView => "data_view".to_owned(),
+            webidl::ast::TypeKind::Error => "error".to_owned(),
+            webidl::ast::TypeKind::Float32Array => "f32_array".to_owned(),
+            webidl::ast::TypeKind::Float64Array => "f64_array".to_owned(),
+            webidl::ast::TypeKind::FrozenArray(ty) => "frozen_array_of_".to_owned() + &ty.type_to_string(),
+            webidl::ast::TypeKind::Identifier(identifier) => identifier.to_snake_case(),
+            webidl::ast::TypeKind::Int16Array => "i16_array".to_owned(),
+            webidl::ast::TypeKind::Int32Array => "i32_array".to_owned(),
+            webidl::ast::TypeKind::Int8Array => "i8_array".to_owned(),
+            webidl::ast::TypeKind::Octet => "u8".to_owned(),
+            webidl::ast::TypeKind::Object => "object".to_owned(),
+            webidl::ast::TypeKind::Promise(ty) => "promise_of_".to_owned() + &(*ty).type_to_string(),
+            webidl::ast::TypeKind::Record(string_type, ty) => format!(
+                "record_from_{}_to_{}",
+                string_type.type_to_string(),
+                (*ty).type_to_string()
+            ),
+            webidl::ast::TypeKind::RestrictedDouble => "restricted_f64".to_owned(),
+            webidl::ast::TypeKind::RestrictedFloat => "restricted_f32".to_owned(),
+            webidl::ast::TypeKind::Sequence(ty) => "sequence_of_".to_owned() + &ty.type_to_string(),
+            webidl::ast::TypeKind::SignedLong => "i32".to_owned(),
+            webidl::ast::TypeKind::SignedLongLong => "i64".to_owned(),
+            webidl::ast::TypeKind::SignedShort => "i16".to_owned(),
+            webidl::ast::TypeKind::Symbol => "symbol".to_owned(),
+            webidl::ast::TypeKind::USVString => "usv_str".to_owned(),
+            webidl::ast::TypeKind::Uint16Array => "u16_array".to_owned(),
+            webidl::ast::TypeKind::Uint32Array => "u32_array".to_owned(),
+            webidl::ast::TypeKind::Uint8Array => "u8_array".to_owned(),
+            webidl::ast::TypeKind::Uint8ClampedArray => "u8_clamped_array".to_owned(),
+            webidl::ast::TypeKind::Union(types) => "union_of_".to_owned() + &types
+                .iter()
+                .map(|ty| (*ty).type_to_string())
+                .collect::<Vec<_>>()
+                .join("_and_"),
+            webidl::ast::TypeKind::UnrestrictedDouble => "unrestricted_f64".to_owned(),
+            webidl::ast::TypeKind::UnrestrictedFloat => "unrestricted_f32".to_owned(),
+            webidl::ast::TypeKind::UnsignedLong => "u32".to_owned(),
+            webidl::ast::TypeKind::UnsignedLongLong => "u64".to_owned(),
+            webidl::ast::TypeKind::UnsignedShort => "u16".to_owned(),
+        }
+    }
+}
+
 impl<'a> FirstPassRecord<'a> {
     /// Use information from the first pass to work out the correct Rust type to use for
     /// a given WebIDL type.
@@ -172,7 +258,7 @@ impl<'a> FirstPassRecord<'a> {
             // bindings.
             webidl::ast::TypeKind::Identifier(ref id) => {
                 let ty = ident_ty(rust_ident(camel_case_ident(&id).as_str()));
-                if self.interfaces.contains(id) {
+                if self.interfaces.contains_key(id) {
                     if pos == TypePosition::Argument {
                         shared_ref(ty)
                     } else {
@@ -320,6 +406,8 @@ impl<'a> FirstPassRecord<'a> {
     pub fn create_function<'b, I>(
         &self,
         name: &str,
+        overloaded: bool,
+        same_argument_names: bool,
         arguments: I,
         mut ret: Option<syn::Type>,
         kind: backend::ast::ImportFunctionKind,
@@ -330,10 +418,36 @@ impl<'a> FirstPassRecord<'a> {
     where
         I: Iterator<Item = (&'b str, &'b webidl::ast::Type, bool)>,
     {
-        let rust_name = rust_ident(&name.to_snake_case());
+        let arguments: Vec<_> = arguments.collect();
+        let rust_name = rust_ident(
+            &if overloaded && !arguments.is_empty() {
+                let argument_type_names = arguments
+                    .iter()
+                    .map(|&(name, ty, variadic)| {
+                        if same_argument_names {
+                            if variadic {
+                                "variadic_".to_owned() + &ty.type_to_string()
+                            } else {
+                                ty.type_to_string()
+                            }
+                        } else {
+                            name.to_snake_case()
+                        }
+                    })
+                    .collect::<Vec<_>>()
+                    .join("_and_");
+                if name == "new" {
+                    "with_".to_owned() + &argument_type_names
+                } else {
+                    name.to_snake_case() + "_with_" + &argument_type_names
+                }
+            } else {
+                name.to_snake_case()
+            }
+        );
         let name = raw_ident(name);
 
-        let arguments = self.webidl_arguments_to_syn_arg_captured(arguments, &kind)?;
+        let arguments = self.webidl_arguments_to_syn_arg_captured(arguments.into_iter(), &kind)?;
 
         let js_ret = ret.clone();
 
@@ -378,6 +492,12 @@ impl<'a> FirstPassRecord<'a> {
         is_static: bool,
         catch: bool,
     ) -> Option<backend::ast::ImportFunction> {
+        let (overloaded, same_argument_names) = self.get_operation_overloading(
+            arguments,
+            ::first_pass::OperationId::Operation(name.cloned()),
+            self_name,
+        );
+
         let name = match name {
             None => {
                 warn!("Operations without a name are unsupported");
@@ -411,6 +531,8 @@ impl<'a> FirstPassRecord<'a> {
 
         self.create_function(
             &name,
+            overloaded,
+            same_argument_names,
             arguments
                 .iter()
                 .map(|arg| (&*arg.name, &*arg.type_, arg.variadic)),
@@ -422,6 +544,40 @@ impl<'a> FirstPassRecord<'a> {
         )
     }
 
+    /// Whether operation is overloaded and
+    /// whether there overloads with same argument names for given argument types
+    pub fn get_operation_overloading(
+        &self,
+        arguments: &[webidl::ast::Argument],
+        id: ::first_pass::OperationId,
+        self_name: &str,
+    ) -> (bool, bool) {
+        self
+            .interfaces
+            .get(self_name)
+            .map(|interface_data| {
+                interface_data
+                    .operations
+                    .get(&id)
+                    .map(|operation_data|
+                        (
+                            operation_data.overloaded,
+                            *operation_data
+                                .argument_names_same
+                                .get(
+                                    &arguments
+                                        .iter()
+                                        .map(|argument| argument.name.clone())
+                                        .collect::<Vec<_>>()
+                                )
+                                .unwrap_or(&false)
+                        )
+                    )
+                    .unwrap_or((false, false))
+            })
+            .unwrap_or((false, false))
+    }
+
     /// Create a wasm-bindgen getter method, if possible.
     pub fn create_getter(
         &self,
@@ -450,7 +606,7 @@ impl<'a> FirstPassRecord<'a> {
         };
         let doc_comment = Some(format!("The `{}` getter\n\n{}", name, mdn_doc(self_name, Some(name))));
 
-        self.create_function(name, iter::empty(), ret, kind, is_structural, catch, doc_comment)
+        self.create_function(name, false, false, iter::empty(), ret, kind, is_structural, catch, doc_comment)
     }
 
     /// Create a wasm-bindgen setter method, if possible.
@@ -475,6 +631,8 @@ impl<'a> FirstPassRecord<'a> {
 
         self.create_function(
             &format!("set_{}", name),
+            false,
+            false,
             iter::once((name, ty, false)),
             None,
             kind,