1 files changed, 34 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-onStep-04.js b/js/src/jit-test/tests/debug/Frame-onStep-04.js
new file mode 100644
index 000000000..d144a3988
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-onStep-04.js
@@ -0,0 +1,34 @@
+// When a recursive function has many frames on the stack, onStep may be set or
+// not independently on each frame.
+
+var g = newGlobal();
+g.eval("function f(x) {\n" +
+       "    if (x > 0)\n" +
+       "        f(x - 1);\n" +
+       "    else\n" +
+       "        debugger;\n" +
+       "    return x;\n" +
+       "}");
+
+var dbg = Debugger(g);
+var seen = [0, 0, 0, 0, 0, 0, 0, 0];
+function step() {
+    seen[this.arguments[0]] = 1;
+}
+dbg.onEnterFrame = function (frame) {
+    // Turn on stepping for even-numbered frames.
+    var x = frame.arguments[0];
+    if (x % 2 === 0)
+        frame.onStep = step;
+};
+dbg.onDebuggerStatement = function (frame) {
+    // This is called with 8 call frames on the stack, 7 down to 0.
+    // At this point we should have seen all the even-numbered frames.
+    assertEq(seen.join(""), "10101010");
+
+    // Now reset seen to see which frames fire onStep on the way out.
+    seen = [0, 0, 0, 0, 0, 0, 0, 0];
+};
+
+g.f(7);
+assertEq(seen.join(""), "10101010");