clear-old-analyses-01.js (1607B)
1 // |jit-test| error:AllDone 2 // When we enter debug mode in a compartment, we must throw away all 3 // analyses in that compartment (debug mode affects the results of 4 // analysis, so they become out of date). This is true even when we would 5 // otherwise be retaining jit code and its related data structures for 6 // animation timing. 7 8 if (typeof gcPreserveCode != "function") 9 throw('AllDone'); 10 11 var g = newGlobal({newCompartment: true}); 12 var dbg = new Debugger; 13 14 g.eval("" + 15 function fib(n) { 16 var a = 0, b = 1; 17 while (n-- > 0) 18 b = b+a, a = b-a; 19 return b; 20 }); 21 22 g.fib(20); // Cause g.fib to be jitted. This creates an analysis with 23 // debug mode off. 24 25 gcPreserveCode(); // Tell the gc to preserve JIT code and analyses by 26 // default. A recent call to js::NotifyAnimationActivity 27 // could have a similar effect in real life. 28 29 dbg.addDebuggee(g); // Put g in debug mode. This triggers a GC which must 30 // clear all analyses. In the original buggy code, we also 31 // release all of g's scripts' JIT code, leading to a 32 // recompilation the next time it was called. 33 34 g.fib(20); // Run g.fib again, causing it to be re-jitted. If the 35 // original analysis is still present, JM will assert, 36 // because it is not in debug mode. 37 38 throw('AllDone');