1 files changed, 104 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-asyncPromise-04.js b/js/src/jit-test/tests/debug/Frame-asyncPromise-04.js
new file mode 100644
index 0000000000..1d2a6bf55f
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-asyncPromise-04.js
@@ -0,0 +1,104 @@
+// Test the promise property on async generator function frames.
+
+load(libdir + 'asserts.js');
+
+var g = newGlobal({ newCompartment: true });
+var dbg = Debugger(g);
+g.eval(`
+async function* f() {
+  debugger;
+  yield 42;
+  debugger;
+  return 50
+}
+`);
+
+let frame;
+const promises = [];
+dbg.onEnterFrame = function(f) {
+  frame = f;
+  promises.push(["enter", frame.asyncPromise]);
+
+  frame.onPop = function() {
+    promises.push(["leave", frame.asyncPromise]);
+  };
+
+  dbg.onDebuggerStatement = function(f) {
+    assertEq(f, frame);
+    promises.push(["dbg", frame.asyncPromise]);
+  };
+};
+
+
+(async () => {
+  const it = g.f();
+
+  // Promise is null until initial iteration.
+  assertEq(frame.asyncPromise, null);
+
+  assertEq(promises.length, 2);
+  assertEq(promises[0][0], "enter");
+  assertEq(promises[0][1], null);
+
+  assertEq(promises[1][0], "leave");
+  assertEq(promises[1][1], null);
+
+
+  const result1Promise = it.next();
+
+  const frameIt1Promise = frame.asyncPromise;
+  assertEq(frameIt1Promise instanceof Debugger.Object, true);
+  assertEq(frameIt1Promise.unsafeDereference(), result1Promise);
+
+  assertEq(promises.length, 5);
+  assertEq(promises[2][0], "enter");
+  assertEq(promises[2][1], frameIt1Promise);
+
+  assertEq(promises[3][0], "dbg");
+  assertEq(promises[3][1], frameIt1Promise);
+
+  assertEq(promises[4][0], "leave");
+  assertEq(promises[4][1], frameIt1Promise);
+
+  await result1Promise;
+
+  // Iteration step has fully completed, so promise state has been cleared.
+  assertEq(frame.asyncPromise, null);
+
+  assertEq(promises.length, 7);
+  assertEq(promises[5][0], "enter");
+  assertEq(promises[5][1], frameIt1Promise);
+
+  assertEq(promises[6][0], "leave");
+  assertEq(promises[6][1], frameIt1Promise);
+
+
+  const result2Promise = it.next();
+
+  const frameIt2Promise = frame.asyncPromise;
+  assertEq(frameIt2Promise instanceof Debugger.Object, true);
+  assertEq(frameIt2Promise.unsafeDereference(), result2Promise);
+  assertEq(frameIt1Promise !== frameIt2Promise, true);
+
+  assertEq(promises.length, 10);
+  assertEq(promises[7][0], "enter");
+  assertEq(promises[7][1], frameIt2Promise);
+
+  assertEq(promises[8][0], "dbg");
+  assertEq(promises[8][1], frameIt2Promise);
+
+  assertEq(promises[9][0], "leave");
+  assertEq(promises[9][1], frameIt2Promise);
+
+  await result2Promise;
+
+  // Frame has terminated, so accessing the property throws.
+  assertThrowsInstanceOf(() => frame.asyncPromise, Error);
+
+  assertEq(promises.length, 12);
+  assertEq(promises[10][0], "enter");
+  assertEq(promises[10][1], frameIt2Promise);
+
+  assertEq(promises[11][0], "leave");
+  assertEq(promises[11][1], frameIt2Promise);
+})();