feat(wasmparser): add feature flag support for component model map feature

Author: yordis

crates/wasmparser/src/features.rs

@@ -286,6 +286,11 @@ define_wasm_features! {
         /// Corresponds to the 🛸 character in
         /// <https://github.com/WebAssembly/component-model/blob/main/design/mvp/Explainer.md>.
         pub cm_gc: CM_GC(1 << 33) = false;
+        /// Support for maps in the component model proposal.
+        ///
+        /// Corresponds to the 🗺️ character in
+        /// <https://github.com/WebAssembly/component-model/blob/main/design/mvp/Explainer.md>.
+        pub cm_map: CM_MAP(1 << 37) = false;
 
         /// Subset of the reference-types WebAssembly proposal which only
         /// encompasses the leb-encoding of the table immediate to the

crates/wasmparser/src/validator/component.rs

@@ -3920,10 +3920,18 @@ impl ComponentState {
             crate::ComponentDefinedType::List(ty) => Ok(ComponentDefinedType::List(
                 self.create_component_val_type(ty, offset)?,
             )),
-            crate::ComponentDefinedType::Map(key, value) => Ok(ComponentDefinedType::Map(
-                self.create_component_val_type(key, offset)?,
-                self.create_component_val_type(value, offset)?,
-            )),
+            crate::ComponentDefinedType::Map(key, value) => {
+                if !self.features.cm_map() {
+                    bail!(
+                        offset,
+                        "Maps require the component model map feature"
+                    )
+                }
+                Ok(ComponentDefinedType::Map(
+                    self.create_component_val_type(key, offset)?,
+                    self.create_component_val_type(value, offset)?,
+                ))
+            },
             crate::ComponentDefinedType::FixedSizeList(ty, elements) => {
                 if !self.features.cm_fixed_size_list() {
                     bail!(