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-rw-r--r--js/src/jit-test/tests/debug/optimized-out-01.js44
1 files changed, 44 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/optimized-out-01.js b/js/src/jit-test/tests/debug/optimized-out-01.js
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+++ b/js/src/jit-test/tests/debug/optimized-out-01.js
@@ -0,0 +1,44 @@
+// Tests that we can reflect optimized out values.
+//
+// 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");
+ // x is unused and should be elided.
+ assertEq(frame.environment.getVariable("x").optimizedOut, true);
+ assertEq(frame.arguments[1].optimizedOut, true);
+ }
+ };
+
+ g.eval("" + function f(d, x) {
+ "use strict";
+ eval("g(d, x)"); // `eval` to avoid inlining g.
+ });
+
+ g.eval("" + function g(d, x) {
+ "use strict";
+ for (var i = 0; i < 200; i++);
+ toggle(d);
+ });
+
+ g.eval("(" + function test() {
+ for (i = 0; i < 5; i++)
+ f(false, 42);
+ f(true, 42);
+ } + ")();");
+});