Remove ReadableStreamByobReader::read_with_u8_array() (#3582)

CHANGELOG.md

@@ -83,6 +83,11 @@
 * Fixed optional parameters in JSDoc.
   [#3577](https://github.com/rustwasm/wasm-bindgen/pull/3577)
 
+### Removed
+
+* Removed `ReadableStreamByobReader::read_with_u8_array()` because it doesn't work with Wasm.
+  [#3582](https://github.com/rustwasm/wasm-bindgen/pull/3582)
+
 ## [0.2.87](https://github.com/rustwasm/wasm-bindgen/compare/0.2.86...0.2.87)
 
 Released 2023-06-12.

crates/web-sys/src/features/gen_ReadableStreamByobReader.rs

@@ -37,16 +37,6 @@ extern "C" {
         this: &ReadableStreamByobReader,
         view: &::js_sys::Object,
     ) -> ::js_sys::Promise;
-    # [wasm_bindgen (method , structural , js_class = "ReadableStreamBYOBReader" , js_name = read)]
-    #[doc = "The `read()` method."]
-    #[doc = ""]
-    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamBYOBReader/read)"]
-    #[doc = ""]
-    #[doc = "*This API requires the following crate features to be activated: `ReadableStreamByobReader`*"]
-    pub fn read_with_u8_array(
-        this: &ReadableStreamByobReader,
-        view: &mut [u8],
-    ) -> ::js_sys::Promise;
     # [wasm_bindgen (method , structural , js_class = "ReadableStreamBYOBReader" , js_name = releaseLock)]
     #[doc = "The `releaseLock()` method."]
     #[doc = ""]

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

@@ -91,6 +91,7 @@ dictionary ReadableStreamReadResult {
 interface ReadableStreamBYOBReader {
   [Throws] constructor(ReadableStream stream);
 
+  [RustNotWasmMemory]
   Promise<ReadableStreamReadResult> read(ArrayBufferView view);
   undefined releaseLock();
 };

crates/webidl/src/constants.rs

@@ -140,5 +140,9 @@ pub(crate) static FIXED_INTERFACES: Lazy<
             "OffscreenCanvasRenderingContext2d",
             canvas_rendering_context,
         ),
+        (
+            "ReadableStreamByobReader",
+            BTreeMap::from_iter([("read", "read_with_array_buffer_view")]),
+        ),
     ])
 });

crates/webidl/src/idl_type.rs

@@ -1,5 +1,6 @@
 use proc_macro2::{Ident, Span};
 use wasm_bindgen_backend::util::{ident_ty, leading_colon_path_ty, raw_ident, rust_ident};
+use weedle::attribute::{ExtendedAttribute, ExtendedAttributeList};
 use weedle::common::Identifier;
 use weedle::term;
 use weedle::types::*;
@@ -659,36 +660,36 @@ impl<'a> IdlType<'a> {
     /// but also flattens unions inside generics of other types.
     ///
     /// [flattened union member types]: https://heycam.github.io/webidl/#dfn-flattened-union-member-types
-    pub(crate) fn flatten(&self) -> Vec<Self> {
+    pub(crate) fn flatten(&self, attrs: Option<&ExtendedAttributeList<'_>>) -> Vec<Self> {
         match self {
             IdlType::Nullable(idl_type) => idl_type
-                .flatten()
+                .flatten(attrs)
                 .into_iter()
                 .map(Box::new)
                 .map(IdlType::Nullable)
                 .collect(),
             IdlType::FrozenArray(idl_type) => idl_type
-                .flatten()
+                .flatten(attrs)
                 .into_iter()
                 .map(Box::new)
                 .map(IdlType::FrozenArray)
                 .collect(),
             IdlType::Sequence(idl_type) => idl_type
-                .flatten()
+                .flatten(attrs)
                 .into_iter()
                 .map(Box::new)
                 .map(IdlType::Sequence)
                 .collect(),
             IdlType::Promise(idl_type) => idl_type
-                .flatten()
+                .flatten(attrs)
                 .into_iter()
                 .map(Box::new)
                 .map(IdlType::Promise)
                 .collect(),
             IdlType::Record(idl_type_from, idl_type_to) => {
                 let mut idl_types = Vec::new();
-                for idl_type_from in idl_type_from.flatten() {
-                    for idl_type_to in idl_type_to.flatten() {
+                for idl_type_from in idl_type_from.flatten(attrs) {
+                    for idl_type_to in idl_type_to.flatten(attrs) {
                         idl_types.push(IdlType::Record(
                             Box::new(idl_type_from.clone()),
                             Box::new(idl_type_to.clone()),
@@ -699,16 +700,30 @@ impl<'a> IdlType<'a> {
             }
             IdlType::Union(idl_types) => idl_types
                 .iter()
-                .flat_map(|idl_type| idl_type.flatten())
+                .flat_map(|idl_type| idl_type.flatten(attrs))
                 .collect(),
-            IdlType::ArrayBufferView { immutable } => vec![
-                IdlType::ArrayBufferView {
+            IdlType::ArrayBufferView { immutable } => {
+                let view = IdlType::ArrayBufferView {
                     immutable: *immutable,
-                },
-                IdlType::Uint8Array {
-                    immutable: *immutable,
-                },
-            ],
+                };
+
+                if let Some(attrs) = attrs {
+                    for attr in &attrs.body.list {
+                        if let ExtendedAttribute::NoArgs(attr) = attr {
+                            if attr.0 .0 == "RustNotWasmMemory" {
+                                return vec![view];
+                            }
+                        }
+                    }
+                }
+
+                vec![
+                    view,
+                    IdlType::Uint8Array {
+                        immutable: *immutable,
+                    },
+                ]
+            }
             IdlType::BufferSource { immutable } => vec![
                 IdlType::BufferSource {
                     immutable: *immutable,
@@ -758,7 +773,7 @@ fn idl_type_flatten_test() {
                 Interface("NodeList"),
             ])),),
         ])
-        .flatten(),
+        .flatten(None),
         vec![
             Interface("Node"),
             Sequence(Box::new(Long)),

crates/webidl/src/util.rs

@@ -266,7 +266,11 @@ impl<'src> FirstPassRecord<'src> {
                 // in-place, but all other flattened types will cause new
                 // signatures to be created.
                 let cur = actual_signatures.len();
-                for (j, idl_type) in idl_type.flatten().into_iter().enumerate() {
+                for (j, idl_type) in idl_type
+                    .flatten(signature.attrs.as_ref())
+                    .into_iter()
+                    .enumerate()
+                {
                     for k in start..cur {
                         if j == 0 {
                             actual_signatures[k].args.push(idl_type.clone());