devtools/server/tests/chrome/test_memory_allocations_03.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <!--
   4 Bug 1067491 - Test that frames keep the same index while we are recording.
   5 -->
   6 <head>
   7   <meta charset="utf-8">
   8   <title>Memory monitoring actor test</title>
   9   <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
  10   <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
  11 </head>
  12 <body>
  13 <pre id="test">
  14 <script src="memory-helpers.js" type="application/javascript"></script>
  15 <script>
  16 "use strict";
  17
  18 window.onload = function() {
  19   SimpleTest.waitForExplicitFinish();
  20
  21   (async function() {
  22     const { memory, target } = await startServerAndGetSelectedTabMemory();
  23     await memory.attach();
  24
  25     await memory.startRecordingAllocations();
  26
  27     // Allocate twice with the exact same stack (hence setTimeout rather than
  28     // allocating directly in the generator), but with getAllocations() calls in
  29     // between.
  30
  31     const allocs = [];
  32     function allocator() {
  33       allocs.push({});
  34     }
  35
  36     setTimeout(allocator, 1);
  37     await waitForTime(2);
  38     const first = await memory.getAllocations();
  39
  40     setTimeout(allocator, 1);
  41     await waitForTime(2);
  42     const second = await memory.getAllocations();
  43
  44     await memory.stopRecordingAllocations();
  45
  46     // Assert that each frame in the first response has the same index in the
  47     // second response. This isn't commutative, so we don't check that all
  48     // of the second response's frames are the same in the first response,
  49     // because there might be new allocations that happen after the first query
  50     // but before the second.
  51
  52     function assertSameFrame(a, b) {
  53       info("  First frame = " + JSON.stringify(a, null, 4));
  54       info("  Second frame = " + JSON.stringify(b, null, 4));
  55
  56       is(!!a, !!b);
  57       if (!a || !b) {
  58         return;
  59       }
  60
  61       is(a.source, b.source);
  62       is(a.line, b.line);
  63       is(a.column, b.column);
  64       is(a.functionDisplayName, b.functionDisplayName);
  65       is(a.parent, b.parent);
  66     }
  67
  68     for (let i = 0; i < first.frames.length; i++) {
  69       info("Checking frames at index " + i + ":");
  70       assertSameFrame(first.frames[i], second.frames[i]);
  71     }
  72
  73     await memory.detach();
  74     destroyServerAndFinish(target);
  75   })();
  76 };
  77 </script>
  78 </pre>
  79 </body>
  80 </html>