Add m-esr52 at 52.6.0

1 files changed, 50 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/debug/onEnterFrame-04.js b/js/src/jit-test/tests/debug/onEnterFrame-04.js
new file mode 100644
index 000000000..21f1a6cb3
--- /dev/null
+++ b/js/src/jit-test/tests/debug/onEnterFrame-04.js
@@ -0,0 +1,50 @@
+// We detect and stop the runaway recursion caused by making onEnterFrame a
+// wrapper of a debuggee function.
+
+// This is all a bit silly. In any reasonable design, both debugger re-entry
+// (the second onEnterFrame invocation) and debuggee re-entry (the call to g.f
+// from within the debugger, not via a Debugger invocation function) would raise
+// errors immediately. We have plans to do so, but in the mean time, we settle
+// for at least detecting the recursion.
+
+load(libdir + 'asserts.js');
+
+var g = newGlobal();
+g.eval("function f(frame) { n++; return 42; }");
+g.n = 0;
+
+var dbg = Debugger();
+var gw = dbg.addDebuggee(g);
+
+// Register the debuggee function as the onEnterFrame handler. When we first
+// call or eval in the debuggee:
+//
+// - The onEnterFrame call reporting that frame's creation is itself an event
+//   that must be reported, so we call onEnterFrame again.
+//
+// - SpiderMonkey detects the out-of-control recursion, and generates a "too
+//   much recursion" InternalError in the youngest onEnterFrame call.
+//
+// - We don't catch it, so the onEnterFrame handler call itself throws.
+//
+// - Since the Debugger doesn't have an uncaughtExceptionHook (it can't; such a
+//   hook would itself raise a "too much recursion" exception), Spidermonkey
+//   reports the exception immediately and terminates the debuggee --- which is
+//   the next-older onEnterFrame call.
+//
+// - This termination propagates all the way out to the initial attempt to
+//   create a frame in the debuggee.
+dbg.onEnterFrame = g.f;
+
+// Get a Debugger.Object instance referring to f.
+var debuggeeF = gw.makeDebuggeeValue(g.f);
+
+// Using f.call allows us to catch the termination.
+assertEq(debuggeeF.call(), null);
+
+// We should never actually begin execution of the function.
+assertEq(g.n, 0);
+
+// When an error is reported, the shell usually exits with a nonzero exit code.
+// If we get here, the test passed, so override that behavior.
+quit(0);