1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Memory-takeCensus-04.js b/js/src/jit-test/tests/debug/Memory-takeCensus-04.js
new file mode 100644
index 0000000000..33fbeaa163
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Memory-takeCensus-04.js
@@ -0,0 +1,27 @@
+// Test that Debugger.Memory.prototype.takeCensus finds GC roots that are on the
+// stack.
+
+var g = newGlobal({newCompartment: true});
+var dbg = new Debugger(g);
+
+g.eval(`
+  function withAllocationMarkerOnStack(f) {
+    (function () {
+      var onStack = allocationMarker();
+      f();
+      return onStack; // To prevent the JIT from optimizing out onStack.
+    }())
+  }
+`);
+
+assertEq("AllocationMarker" in dbg.memory.takeCensus().objects, false,
+         "There shouldn't exist any allocation markers in the census.");
+
+var allocationMarkerCount;
+g.withAllocationMarkerOnStack(() => {
+  allocationMarkerCount = dbg.memory.takeCensus().objects.AllocationMarker.count;
+});
+
+assertEq(allocationMarkerCount, 1,
+         "Should have one allocation marker in the census, because there " +
+         "was one on the stack.");