Auto merge of #26544 - CYBAI:module-metadata-hook, r=jdm

Introduce import.meta hook for module script

<!-- Please describe your changes on the following line: -->

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #26542
- [x] There are tests for these changes under `module/import-meta` folder.

components/script/script_module.rs

@@ -49,6 +49,7 @@ use js::jsapi::{GetRequestedModules, SetModuleMetadataHook};
 use js::jsapi::{GetWaitForAllPromise, ModuleEvaluate, ModuleInstantiate};
 use js::jsapi::{Heap, JSContext, JS_ClearPendingException, SetModulePrivate};
 use js::jsapi::{JSAutoRealm, JSObject, JSString};
+use js::jsapi::{JS_DefineProperty4, JS_NewStringCopyN, JSPROP_ENUMERATE};
 use js::jsapi::{SetModuleDynamicImportHook, SetScriptPrivateReferenceHooks};
 use js::jsval::{JSVal, PrivateValue, UndefinedValue};
 use js::rust::jsapi_wrapped::{GetRequestedModuleSpecifier, JS_GetPendingException};
@@ -1063,7 +1064,7 @@ pub unsafe fn EnsureModuleHooksInitialized(rt: *mut JSRuntime) {
     }
 
     SetModuleResolveHook(rt, Some(HostResolveImportedModule));
-    SetModuleMetadataHook(rt, None);
+    SetModuleMetadataHook(rt, Some(HostPopulateImportMeta));
     SetScriptPrivateReferenceHooks(rt, None, None);
 
     SetModuleDynamicImportHook(rt, None);
@@ -1118,6 +1119,39 @@ unsafe extern "C" fn HostResolveImportedModule(
     unreachable!()
 }
 
+#[allow(unsafe_code, non_snake_case)]
+/// https://tc39.es/ecma262/#sec-hostgetimportmetaproperties
+/// https://html.spec.whatwg.org/multipage/#hostgetimportmetaproperties
+unsafe extern "C" fn HostPopulateImportMeta(
+    cx: *mut JSContext,
+    reference_private: RawHandleValue,
+    meta_object: RawHandle<*mut JSObject>,
+) -> bool {
+    let in_realm_proof = AlreadyInRealm::assert_for_cx(SafeJSContext::from_ptr(cx));
+    let global_scope = GlobalScope::from_context(cx, InRealm::Already(&in_realm_proof));
+
+    // Step 2.
+    let base_url = match (reference_private.to_private() as *const ModuleScript).as_ref() {
+        Some(module_data) => module_data.base_url.clone(),
+        None => global_scope.api_base_url(),
+    };
+
+    rooted!(in(cx) let url_string = JS_NewStringCopyN(
+        cx,
+        base_url.as_str().as_ptr() as *const i8,
+        base_url.as_str().len()
+    ));
+
+    // Step 3.
+    JS_DefineProperty4(
+        cx,
+        meta_object,
+        "url\0".as_ptr() as *const i8,
+        url_string.handle().into_handle(),
+        JSPROP_ENUMERATE.into(),
+    )
+}
+
 /// https://html.spec.whatwg.org/multipage/#fetch-a-module-script-tree
 pub fn fetch_external_module_script(
     owner: ModuleOwner,

tests/wpt/include.ini

@@ -121,8 +121,6 @@ skip: true
           skip: false
           [dynamic-import]
             skip: true
-          [import-meta]
-            skip: true
         [moving-between-documents]
           skip: true
 [js]

tests/wpt/metadata/html/semantics/scripting-1/the-script-element/module/import-meta/import-meta-url.html.ini

@@ -1,2 +0,0 @@
-[import-meta-url.html]
-  expected: TIMEOUT