1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Memory-drainAllocationsLog-14.js b/js/src/jit-test/tests/debug/Memory-drainAllocationsLog-14.js
new file mode 100644
index 0000000000..39b2674c31
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Memory-drainAllocationsLog-14.js
@@ -0,0 +1,47 @@
+// Test that drainAllocationsLog returns some timestamps.
+
+load(libdir + 'asserts.js');
+
+var allocTimes = [];
+
+allocTimes.push(timeSinceCreation());
+
+const root = newGlobal({newCompartment: true});
+const dbg = new Debugger(root);
+
+dbg.memory.trackingAllocationSites = true;
+root.eval("this.alloc1 = {}");
+allocTimes.push(timeSinceCreation());
+root.eval("this.alloc2 = {}");
+allocTimes.push(timeSinceCreation());
+root.eval("this.alloc3 = {}");
+allocTimes.push(timeSinceCreation());
+root.eval("this.alloc4 = {}");
+allocTimes.push(timeSinceCreation());
+
+allocs = dbg.memory.drainAllocationsLog();
+assertEq(allocs.length >= 4, true);
+assertEq(allocs[0].timestamp >= allocTimes[0], true);
+var seenAlloc = 0;
+var lastIndexSeenAllocIncremented = 0;
+for (i = 1; i < allocs.length; ++i) {
+    assertEq(allocs[i].timestamp >= allocs[i - 1].timestamp, true);
+    // It isn't possible to exactly correlate the entries in the
+    // allocs array with the entries in allocTimes, because we can't
+    // control exactly how many allocations are done during the course
+    // of a given eval.  However, we can assume that there is some
+    // allocation recorded after each entry in allocTimes.  So, we
+    // track the allocTimes entry we've passed, and then after the
+    // loop assert that we've seen them all.  We also assert that a
+    // non-zero number of allocations has happened since the last seen
+    // increment.
+    while (seenAlloc < allocTimes.length
+           && allocs[i].timestamp >= allocTimes[seenAlloc]) {
+        assertEq(i - lastIndexSeenAllocIncremented > 0, true);
+        lastIndexSeenAllocIncremented = i;
+        ++seenAlloc;
+    }
+}
+// There should be one entry left in allocTimes, because we recorded a
+// time after the last possible allocation in the array.
+assertEq(seenAlloc, allocTimes.length -1);