1 files changed, 30 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Debugger-debuggees-31.js b/js/src/jit-test/tests/debug/Debugger-debuggees-31.js
new file mode 100644
index 0000000000..0eb7f65212
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Debugger-debuggees-31.js
@@ -0,0 +1,30 @@
+// |jit-test| skip-if: !hasFunction["gczeal"]
+// Removing and adding debuggees during an incremental sweep should not confuse
+// the generatorFrames map.
+
+// Let any ongoing incremental GC finish, and then clear any ambient zeal
+// settings established by the harness (the JS_GC_ZEAL env var, shell arguments,
+// etc.)
+gczeal(0);
+
+let g = newGlobal({newCompartment: true});
+g.eval('function* f() { yield 123; }');
+
+let dbg = Debugger(g);
+dbg.onEnterFrame = frame => {
+    dbg.removeDebuggee(g);
+    dbg.addDebuggee(g);
+};
+
+// Select GCZeal mode 10 (IncrementalMultipleSlices: Incremental GC in many
+// slices) and use long slices, to make sure that the debuggee removal occurs
+// during a slice.
+gczeal(10, 0);
+gcslice(1);
+while (gcstate() !== "NotAcctive" && gcstate() !== "Sweep") {
+  gcslice(1000);
+}
+
+let genObj = g.f();
+genObj.return();
+assertEq(gcstate(), "Sweep");