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-rw-r--r--js/src/jit-test/tests/debug/Environment-getVariable-13.js47
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diff --git a/js/src/jit-test/tests/debug/Environment-getVariable-13.js b/js/src/jit-test/tests/debug/Environment-getVariable-13.js
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+++ b/js/src/jit-test/tests/debug/Environment-getVariable-13.js
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+// Tests that we can use debug scopes with Ion frames.
+//
+// Unfortunately these tests are brittle. They depend on opaque JIT heuristics
+// kicking in.
+
+load(libdir + "jitopts.js");
+
+if (!jitTogglesMatch(Opts_Ion2NoOffthreadCompilation))
+ quit(0);
+
+withJitOptions(Opts_Ion2NoOffthreadCompilation, function () {
+ var g = newGlobal();
+ var dbg = new Debugger;
+
+ // Note that this *depends* on CCW scripted functions being opaque to Ion
+ // optimization and not deoptimizing the frames below the call to toggle.
+ g.toggle = function toggle(d) {
+ if (d) {
+ dbg.addDebuggee(g);
+ var frame = dbg.getNewestFrame();
+ assertEq(frame.implementation, "ion");
+ // g is heavyweight but its call object is optimized out, because its
+ // arguments and locals are unaliased.
+ //
+ // Calling frame.environment here should make a fake debug scope that
+ // gets things directly from the frame. Calling frame.arguments doesn't
+ // go through the scope object and reads directly off the frame. Assert
+ // that the two are equal.
+ assertEq(frame.environment.getVariable("x"), frame.arguments[1]);
+ }
+ };
+
+ g.eval("" + function f(d, x) { g(d, x); });
+ g.eval("" + function g(d, x) {
+ for (var i = 0; i < 200; i++);
+ function inner() { i = 42; };
+ toggle(d);
+ // Use x so it doesn't get optimized out.
+ x++;
+ });
+
+ g.eval("(" + function test() {
+ for (i = 0; i < 5; i++)
+ f(false, 42);
+ f(true, 42);
+ } + ")();");
+});