1 files changed, 50 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-offset-04.js b/js/src/jit-test/tests/debug/Frame-offset-04.js
new file mode 100644
index 0000000000..01523b563a
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-offset-04.js
@@ -0,0 +1,50 @@
+// frame.offset works in async fns.
+
+load(libdir + "asserts.js");
+
+var g = newGlobal({ newCompartment: true });
+var dbg = new Debugger(g);
+g.eval(`
+async function f() {
+  await Promise.resolve();
+}
+`);
+
+const ranges = [];
+let script;
+let frame;
+dbg.onEnterFrame = function(f) {
+  if (frame) {
+    assertEq(f, frame);
+    assertEq(f.script, script);
+  } else {
+    frame = f;
+    script = f.script;
+    assertEq(frame instanceof Debugger.Frame, true);
+    assertEq(script instanceof Debugger.Script, true);
+  }
+
+  const range = [script.getOffsetMetadata(frame.offset).lineNumber, null];
+  ranges.push(range);
+  f.onPop = () => {
+    range[1] = script.getOffsetMetadata(frame.offset).lineNumber;
+  };
+};
+
+(async () => {
+  const promise = g.f();
+
+  assertEq(ranges.length, 1);
+  assertEq(ranges[0][0], 2);
+  assertEq(ranges[0][1], 3);
+  assertEq(script.getOffsetMetadata(frame.offset).lineNumber, 3);
+
+  await promise;
+
+  assertEq(ranges.length, 2);
+  assertEq(ranges[1][0], 3);
+  assertEq(ranges[1][1], 4);
+
+  // The frame has finished evaluating, so the callee is no longer accessible.
+  assertThrowsInstanceOf(() => frame.offset, Error);
+})();