tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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gc-04.js (664B)

      1 // Storing a Debugger.Object as a key in a WeakMap protects it from GC as long as
      2 // the referent is alive.
      3 
      4 var g = newGlobal({newCompartment: true});
      5 var N = g.N = 10;
      6 var dbg = Debugger(g);
      7 var cache = new WeakMap;
      8 
      9 var i = 0;
     10 dbg.onDebuggerStatement = function (frame) {
     11    cache.set(frame.arguments[0], i++);
     12 };
     13 g.eval("function f(x) { debugger; }");
     14 g.eval("var arr = [], j; for (j = 0; j < N; j++) arr[j] = {};");
     15 g.eval("for (j = 0; j < N; j++) f(arr[j]);");
     16 assertEq(i, N);
     17 
     18 gc(); gc();
     19 
     20 i = 0;
     21 dbg.onDebuggerStatement = function (frame) {
     22    assertEq(cache.get(frame.arguments[0]), i++)
     23 };
     24 g.eval("for (j = 0; j < N; j++) f(arr[j]);");
     25 assertEq(i, N);