1 files changed, 48 insertions, 0 deletions
diff --git a/tools/profiler/tests/xpcshell/test_feature_stackwalking.js b/tools/profiler/tests/xpcshell/test_feature_stackwalking.js
new file mode 100644
index 0000000000..aa0bc86547
--- /dev/null
+++ b/tools/profiler/tests/xpcshell/test_feature_stackwalking.js
@@ -0,0 +1,48 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Do a basic test to see if native frames are being collected for stackwalking. This
+ * test is fairly naive, as it does not attempt to check that these are valid symbols,
+ * only that some kind of stack walking is happening. It does this by making sure at
+ * least two native frames are collected.
+ */
+add_task(async () => {
+  const entries = 10000;
+  const interval = 1;
+  const threads = [];
+  const features = ["stackwalk"];
+
+  await Services.profiler.StartProfiler(entries, interval, features, threads);
+  const sampleIndex = await captureAtLeastOneJsSample();
+
+  const profile = await stopNowAndGetProfile();
+  const [thread] = profile.threads;
+  const { samples } = thread;
+
+  const inflatedStackFrames = getInflatedStackLocations(
+    thread,
+    samples.data[sampleIndex]
+  );
+  const nativeStack = /^0x[0-9a-f]+$/;
+
+  expectStackToContain(
+    inflatedStackFrames,
+    [
+      "(root)",
+      // There are probably more native stacks here.
+      nativeStack,
+      nativeStack,
+      // Since this is an xpcshell test we know that JavaScript will run:
+      "js::RunScript",
+      // There are probably more native stacks here.
+      nativeStack,
+      nativeStack,
+    ],
+    "Expected native stacks to be interleaved between some frame labels. There should" +
+      "be more than one native stack if stack walking is working correctly. There " +
+      "is no attempt here to determine if the memory addresses point to the correct " +
+      "symbols"
+  );
+});