1 files changed, 50 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-older-generators-02.js b/js/src/jit-test/tests/debug/Frame-older-generators-02.js
new file mode 100644
index 0000000000..f677bf64a8
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-older-generators-02.js
@@ -0,0 +1,50 @@
+// Like Frame-older-generators-01.js, but attach the debugger on the fly.
+//
+// (That is, check that it works even if the debugger never received
+// onNewGenerator for the generator, because it wasn't attached at the time.)
+
+let g = newGlobal({newCompartment: true});
+g.eval(`
+    function f() {
+        attach();
+        debugger;
+    }
+    function* gen() {
+        f();
+        yield 1;
+        f();
+    }
+    async function af() {
+        f();
+        await 1;
+        f();
+    }
+`);
+
+function test(expected, code) {
+    let dbg;
+    let hits = 0;
+    let genFrame = null;
+
+    g.attach = () => {
+        if (dbg === undefined) {
+            dbg = Debugger(g);
+            dbg.onDebuggerStatement = frame => {
+                hits++;
+                assertEq(frame.callee.name, "f");
+                if (genFrame === null) {
+                    genFrame = frame.older;
+                } else {
+                    assertEq(frame.older, genFrame);
+                }
+                assertEq(genFrame.callee.name, expected);
+            };
+        }
+    };
+    g.eval(code);
+    assertEq(hits, 2);
+    dbg.removeDebuggee(g);
+}
+
+test("gen", "for (var x of gen()) {}");
+test("af", "af(); drainJobQueue();");