devtools/shared/heapsnapshot/tests/unit/test_ReadHeapSnapshot_with_allocations.js


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/* Any copyright is dedicated to the Public Domain.
   http://creativecommons.org/publicdomain/zero/1.0/ */

// Test that we can save a core dump with allocation stacks and read it back
// into a HeapSnapshot.

if (typeof Debugger != "function") {
  const { addDebuggerToGlobal } = Cu.import("resource://gre/modules/jsdebugger.jsm", {});
  addDebuggerToGlobal(this);
}

function run_test() {
  // Create a Debugger observing a debuggee's allocations.
  const debuggee = new Cu.Sandbox(null);
  const dbg = new Debugger(debuggee);
  dbg.memory.trackingAllocationSites = true;

  // Allocate some objects in the debuggee that will have their allocation
  // stacks recorded by the Debugger.
  debuggee.eval("this.objects = []");
  for (let i = 0; i < 100; i++) {
    debuggee.eval("this.objects.push({})");
  }

  // Now save a snapshot that will include the allocation stacks and read it
  // back again.

  const filePath = ChromeUtils.saveHeapSnapshot({ runtime: true });
  ok(true, "Should be able to save a snapshot.");

  const snapshot = ChromeUtils.readHeapSnapshot(filePath);
  ok(snapshot, "Should be able to read a heap snapshot");
  ok(snapshot instanceof HeapSnapshot, "Should be an instanceof HeapSnapshot");

  do_test_finished();
}