Use dynamic dispatch in mozjs::panic::wrap_panic

Pick up https://github.com/servo/rust-mozjs/pull/512

Fixes https://github.com/servo/servo/issues/26585

This diff is best viewed with "ignore whitespace changes", because of indentation change.

Cargo.lock

@@ -3572,7 +3572,7 @@ dependencies = [
 [[package]]
 name = "mozjs"
 version = "0.13.0"
-source = "git+https://github.com/servo/rust-mozjs#11cabdef2cbf0884a2cc33e3c73719646bd31ce5"
+source = "git+https://github.com/servo/rust-mozjs#dbb9bee06e0b0168ccae0619c5077e302669d2fb"
 dependencies = [
  "cc",
  "lazy_static",

components/script/dom/bindings/codegen/CodegenRust.py

@@ -2573,9 +2573,19 @@ class CGAbstractMethod(CGThing):
         body = self.definition_body()
 
         if self.catchPanic:
-            body = CGWrapper(CGIndenter(body),
+            if self.returnType == "void":
-                             pre="return wrap_panic(panic::AssertUnwindSafe(|| {\n",
+                pre = "wrap_panic(&mut || {\n"
-                             post=("""\n}), %s);""" % ("()" if self.returnType == "void" else "false")))
+                post = "\n})"
+            else:
+                pre = (
+                    "let mut result = false;\n"
+                    "wrap_panic(&mut || result = (|| {\n"
+                )
+                post = (
+                    "\n})());\n"
+                    "return result"
+                )
+            body = CGWrapper(CGIndenter(body), pre=pre, post=post)
 
         return CGWrapper(CGIndenter(body),
                          pre=self.definition_prologue(),

components/script/script_runtime.rs

@@ -81,7 +81,6 @@ use std::io::{stdout, Write};
 use std::ops::Deref;
 use std::os;
 use std::os::raw::c_void;
-use std::panic::AssertUnwindSafe;
 use std::ptr;
 use std::rc::Rc;
 use std::sync::Mutex;
@@ -169,29 +168,27 @@ pub trait ScriptPort {
 
 #[allow(unsafe_code)]
 unsafe extern "C" fn get_incumbent_global(_: *const c_void, _: *mut RawJSContext) -> *mut JSObject {
-    wrap_panic(
+    let mut result = ptr::null_mut();
-        AssertUnwindSafe(|| {
+    wrap_panic(&mut || {
         let incumbent_global = GlobalScope::incumbent();
 
         assert!(incumbent_global.is_some());
 
-            incumbent_global
+        result = incumbent_global
             .map(|g| g.reflector().get_jsobject().get())
             .unwrap_or(ptr::null_mut())
-        }),
+    });
-        ptr::null_mut(),
+    result
-    )
 }
 
 #[allow(unsafe_code)]
 unsafe extern "C" fn empty(extra: *const c_void) -> bool {
-    wrap_panic(
+    let mut result = false;
-        AssertUnwindSafe(|| {
+    wrap_panic(&mut || {
         let microtask_queue = &*(extra as *const MicrotaskQueue);
-            microtask_queue.empty()
+        result = microtask_queue.empty()
-        }),
+    });
-        false,
+    result
-    )
 }
 
 /// SM callback for promise job resolution. Adds a promise callback to the current
@@ -206,8 +203,8 @@ unsafe extern "C" fn enqueue_promise_job(
     incumbent_global: HandleObject,
 ) -> bool {
     let cx = JSContext::from_ptr(cx);
-    wrap_panic(
+    let mut result = false;
-        AssertUnwindSafe(|| {
+    wrap_panic(&mut || {
         let microtask_queue = &*(extra as *const MicrotaskQueue);
         let global = GlobalScope::from_object(incumbent_global.get());
         let pipeline = global.pipeline_id();
@@ -226,10 +223,9 @@ unsafe extern "C" fn enqueue_promise_job(
             }),
             cx,
         );
-            true
+        result = true
-        }),
+    });
-        false,
+    result
-    )
 }
 
 #[allow(unsafe_code, unrooted_must_root)]
@@ -248,8 +244,7 @@ unsafe extern "C" fn promise_rejection_tracker(
     let in_realm_proof = AlreadyInRealm::assert_for_cx(cx);
     let global = GlobalScope::from_context(*cx, InRealm::Already(&in_realm_proof));
 
-    wrap_panic(
+    wrap_panic(&mut || {
-        AssertUnwindSafe(|| {
         match state {
             // Step 4.
             PromiseRejectionHandlingState::Unhandled => {
@@ -308,9 +303,7 @@ unsafe extern "C" fn promise_rejection_tracker(
             ).unwrap();
             },
         };
-        }),
+    })
-        (),
-    );
 }
 
 #[allow(unsafe_code, unrooted_must_root)]