clear-old-analyses-01.js

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// |jit-test| error:AllDone

// When we enter debug mode in a compartment, we must throw away all

// analyses in that compartment (debug mode affects the results of

// analysis, so they become out of date). This is true even when we would

// otherwise be retaining jit code and its related data structures for

// animation timing.

if (typeof gcPreserveCode != "function")

  throw('AllDone');

var g = newGlobal({newCompartment: true});

var dbg = new Debugger;

g.eval("" +

       function fib(n) {

         var a = 0, b = 1;

         while (n-- > 0)

           b = b+a, a = b-a;

         return b;

});

g.fib(20);                      // Cause g.fib to be jitted. This creates an analysis with

                                // debug mode off.

gcPreserveCode();               // Tell the gc to preserve JIT code and analyses by

                                // default. A recent call to js::NotifyAnimationActivity

                                // could have a similar effect in real life.

dbg.addDebuggee(g);             // Put g in debug mode. This triggers a GC which must

                                // clear all analyses. In the original buggy code, we also

                                // release all of g's scripts' JIT code, leading to a

                                // recompilation the next time it was called.

g.fib(20);                      // Run g.fib again, causing it to be re-jitted. If the

                                // original analysis is still present, JM will assert,

                                // because it is not in debug mode.

throw('AllDone');