1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-olderSavedFrame-01.js b/js/src/jit-test/tests/debug/Frame-olderSavedFrame-01.js
new file mode 100644
index 0000000000..018e6130ea
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-olderSavedFrame-01.js
@@ -0,0 +1,40 @@
+// An explicit async stack should be available via olderSavedFrame.
+// This test makes sure that "main" shows up as an async saved frame
+// instead of "older", even though "drainJobQueue()" is running inside of
+// "main()" directly.
+
+var g = newGlobal({ newCompartment: true });
+var dbg = new Debugger(g);
+let done = false;
+dbg.onDebuggerStatement = function (frame) {
+  // This frame has an "olderSavedFrame" because "run()" is an async function
+  // and those have explicit async stacks attached to them.
+  const parent = frame.olderSavedFrame;
+  assertEq(typeof parent.source, "string");
+  assertEq(parent.line, 12);
+  assertEq(parent.column, 3);
+  assertEq(parent.asyncCause, "async");
+  assertEq(parent.functionDisplayName, "main");
+  done = true;
+};
+
+g.eval(`
+let draining = false;
+async function run() {
+  await Promise.resolve();
+
+  // Make sure that the test is running within "drainJobQueue()".
+  assertEq(draining, true);
+  debugger;
+}
+
+(function main() {
+  run();
+
+  // Force resumption of the "run" function.
+  draining = true;
+  drainJobQueue();
+  draining = false;
+})();
+`);
+assertEq(done, true);