1 files changed, 52 insertions, 0 deletions
diff --git a/tools/profiler/tests/xpcshell/test_enterjit_osr.js b/tools/profiler/tests/xpcshell/test_enterjit_osr.js
new file mode 100644
index 0000000000..86845ddc76
--- /dev/null
+++ b/tools/profiler/tests/xpcshell/test_enterjit_osr.js
@@ -0,0 +1,52 @@
+// Check that the EnterJIT frame, added by the JIT trampoline and
+// usable by a native unwinder to resume unwinding after encountering
+// JIT code, is pushed as expected.
+function run_test() {
+  // This test assumes that it's starting on an empty profiler stack.
+  // (Note that the other profiler tests also assume the profiler
+  // isn't already started.)
+  Assert.ok(!Services.profiler.IsActive());
+
+  const ms = 5;
+  Services.profiler.StartProfiler(10000, ms, ["js"]);
+
+  function has_arbitrary_name_in_stack() {
+    // A frame for |arbitrary_name| has been pushed.  Do a sequence of
+    // increasingly long spins until we get a sample.
+    var delayMS = 5;
+    while (1) {
+      info("loop: ms = " + delayMS);
+      const then = Date.now();
+      do {
+        let n = 10000;
+        // eslint-disable-next-line no-empty
+        while (--n) {} // OSR happens here
+        // Spin in the hope of getting a sample.
+      } while (Date.now() - then < delayMS);
+      let profile = Services.profiler.getProfileData().threads[0];
+
+      // Go through all of the stacks, and search for this function name.
+      for (const sample of profile.samples.data) {
+        const stack = getInflatedStackLocations(profile, sample);
+        info(`The following stack was found: ${stack}`);
+        for (var i = 0; i < stack.length; i++) {
+          if (stack[i].match(/arbitrary_name/)) {
+            // This JS sample was correctly found.
+            return true;
+          }
+        }
+      }
+
+      // Continue running this function with an increasingly long delay.
+      delayMS *= 2;
+      if (delayMS > 30000) {
+        return false;
+      }
+    }
+  }
+  Assert.ok(
+    has_arbitrary_name_in_stack(),
+    "A JS frame was found before the test timeout."
+  );
+  Services.profiler.StopProfiler();
+}