optimized-out-01.js (1301B)
1 // Tests that we can reflect optimized out values. 2 // 3 // Unfortunately these tests are brittle. They depend on opaque JIT heuristics 4 // kicking in. 5 6 // Use gczeal 0 to keep CGC from invalidating Ion code and causing test failures. 7 gczeal(0); 8 9 load(libdir + "jitopts.js"); 10 11 if (!jitTogglesMatch(Opts_Ion2NoOffthreadCompilation)) 12 quit(0); 13 14 withJitOptions(Opts_Ion2NoOffthreadCompilation, function () { 15 var g = newGlobal({newCompartment: true}); 16 var dbg = new Debugger; 17 18 // Note that this *depends* on CCW scripted functions being opaque to Ion 19 // optimization and not deoptimizing the frames below the call to toggle. 20 g.toggle = function toggle(d) { 21 if (d) { 22 dbg.addDebuggee(g); 23 var frame = dbg.getNewestFrame(); 24 assertEq(frame.implementation, "ion"); 25 // x is unused and should be elided. 26 assertEq(frame.environment.getVariable("x").optimizedOut, true); 27 assertEq(frame.arguments[1].optimizedOut, true); 28 } 29 }; 30 31 g.eval("" + function f(d, x) { 32 "use strict"; 33 eval("g(d, x)"); // `eval` to avoid inlining g. 34 }); 35 36 g.eval("" + function g(d, x) { 37 "use strict"; 38 for (var i = 0; i < 100; i++); 39 toggle(d); 40 }); 41 42 g.eval("(" + function test() { 43 for (i = 0; i < 15; i++) 44 f(false, 42); 45 f(true, 42); 46 } + ")();"); 47 });