tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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bug-1505622.js (1278B)

      1 // Test that we don't repeatedly trigger last-ditch GCs.
      2 
      3 // Turn of any zeal which will disrupt GC number checks.
      4 gczeal(0);
      5 
      6 function allocUntilFail() {
      7  gc(null, 'shrinking');
      8 
      9  const initialSize = gcparam("gcBytes");
     10  const initialMaxSize = gcparam("maxBytes");
     11  const initGCNumber = gcparam("majorGCNumber");
     12 
     13  // Set a small heap limit.
     14  gcparam("maxBytes", initialSize + 16 * 1024);
     15 
     16  let error;
     17  try {
     18    let a = [];
     19    while (true) {
     20      a.push(Symbol()); // Symbols are tenured.
     21    }
     22  } catch(err) {
     23    error = err;
     24  }
     25 
     26  const finalGCNumber = gcparam("majorGCNumber");
     27 
     28  // Resetore heap limit.
     29  gcparam("maxBytes", initialMaxSize);
     30 
     31  gc();
     32  assertEq(error, "out of memory");
     33  return finalGCNumber - initGCNumber;
     34 }
     35 
     36 // Set the time limit for skipping last ditch GCs to 5 seconds.
     37 gcparam("minLastDitchGCPeriod", 5);
     38 assertEq(gcparam("minLastDitchGCPeriod"), 5);
     39 
     40 // Allocate up to the heap limit. This triggers a last ditch GC.
     41 let gcCount = allocUntilFail();
     42 assertEq(gcCount, 1)
     43 
     44 // Allocate up to the limit again. The second time we fail without
     45 // triggering a GC.
     46 gcCount = allocUntilFail();
     47 assertEq(gcCount, 0)
     48 
     49 // Wait for time limit to expire.
     50 sleep(6);
     51 
     52 // Check we trigger a GC again.
     53 gcCount = allocUntilFail();
     54 assertEq(gcCount, 1)