1 files changed, 111 insertions, 0 deletions
diff --git a/devtools/shared/heapsnapshot/tests/xpcshell/test_HeapSnapshot_takeCensus_09.js b/devtools/shared/heapsnapshot/tests/xpcshell/test_HeapSnapshot_takeCensus_09.js
new file mode 100644
index 0000000000..99830d75cb
--- /dev/null
+++ b/devtools/shared/heapsnapshot/tests/xpcshell/test_HeapSnapshot_takeCensus_09.js
@@ -0,0 +1,111 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+// HeapSnapshot.prototype.takeCensus: by: allocationStack breakdown
+//
+// Ported from js/src/jit-test/tests/debug/Memory-takeCensus-09.js
+
+function run_test() {
+  const g = newGlobal();
+  const dbg = new Debugger(g);
+
+  g.eval(`                                              // 1
+         var log = [];                                  // 2
+         function f() { log.push(allocationMarker()); } // 3
+         function g() { f(); }                          // 4
+         function h() { f(); }                          // 5
+         `);
+
+  // Create one allocationMarker with tracking turned off,
+  // so it will have no associated stack.
+  g.f();
+
+  dbg.memory.allocationSamplingProbability = 1;
+
+  for (const [func, n] of [
+    [g.f, 20],
+    [g.g, 10],
+    [g.h, 5],
+  ]) {
+    for (let i = 0; i < n; i++) {
+      dbg.memory.trackingAllocationSites = true;
+      // All allocations of allocationMarker occur with this line as the oldest
+      // stack frame.
+      func();
+      dbg.memory.trackingAllocationSites = false;
+    }
+  }
+
+  const census = saveHeapSnapshotAndTakeCensus(dbg, {
+    breakdown: {
+      by: "objectClass",
+      then: {
+        by: "allocationStack",
+        then: { by: "count", label: "haz stack" },
+        noStack: {
+          by: "count",
+          label: "no haz stack",
+        },
+      },
+    },
+  });
+
+  const map = census.AllocationMarker;
+  ok(map instanceof Map, "Should be a Map instance");
+  equal(
+    map.size,
+    4,
+    "Should have 4 allocation stacks (including the lack of a stack)"
+  );
+
+  // Gather the stacks we are expecting to appear as keys, and
+  // check that there are no unexpected keys.
+  const stacks = {};
+
+  map.forEach((v, k) => {
+    if (k === "noStack") {
+      // No need to save this key.
+    } else if (
+      k.functionDisplayName === "f" &&
+      k.parent.functionDisplayName === "run_test"
+    ) {
+      stacks.f = k;
+    } else if (
+      k.functionDisplayName === "f" &&
+      k.parent.functionDisplayName === "g" &&
+      k.parent.parent.functionDisplayName === "run_test"
+    ) {
+      stacks.fg = k;
+    } else if (
+      k.functionDisplayName === "f" &&
+      k.parent.functionDisplayName === "h" &&
+      k.parent.parent.functionDisplayName === "run_test"
+    ) {
+      stacks.fh = k;
+    } else {
+      dumpn("Unexpected allocation stack:");
+      k.toString()
+        .split(/\n/g)
+        .forEach(s => dumpn(s));
+      ok(false);
+    }
+  });
+
+  equal(map.get("noStack").label, "no haz stack");
+  equal(map.get("noStack").count, 1);
+
+  ok(stacks.f);
+  equal(map.get(stacks.f).label, "haz stack");
+  equal(map.get(stacks.f).count, 20);
+
+  ok(stacks.fg);
+  equal(map.get(stacks.fg).label, "haz stack");
+  equal(map.get(stacks.fg).count, 10);
+
+  ok(stacks.fh);
+  equal(map.get(stacks.fh).label, "haz stack");
+  equal(map.get(stacks.fh).count, 5);
+
+  do_test_finished();
+}