1 files changed, 74 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Memory-takeCensus-09.js b/js/src/jit-test/tests/debug/Memory-takeCensus-09.js
new file mode 100644
index 000000000..09b28da34
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Memory-takeCensus-09.js
@@ -0,0 +1,74 @@
+// Debugger.Memory.prototype.takeCensus: by: allocationStack breakdown
+
+var g = newGlobal();
+var dbg = new Debugger(g);
+
+g.evaluate(`
+           var log = [];
+           function f() { log.push(allocationMarker()); }
+           function g() { f(); }
+           function h() { f(); }
+           `,
+           { fileName: "Rockford", lineNumber: 1000 });
+
+// Create one allocationMarker with tracking turned off,
+// so it will have no associated stack.
+g.f();
+
+dbg.memory.allocationSamplingProbability = 1;
+dbg.memory.trackingAllocationSites = true;
+
+for ([f, n] of [[g.f, 20], [g.g, 10], [g.h, 5]])
+  for (let i = 0; i < n; i++)
+    f();  // all allocations of allocationMarker occur with this line as the
+          // oldest stack frame.
+
+let census = dbg.memory.takeCensus({ breakdown: { by: 'objectClass',
+                                                  then: { by: 'allocationStack',
+                                                          then: { by: 'count',
+                                                                  label: 'haz stack'
+                                                                },
+                                                          noStack: { by: 'count',
+                                                                     label: 'no haz stack'
+                                                                   }
+                                                        }
+                                                }
+                                   });
+
+let map = census.AllocationMarker;
+assertEq(map instanceof Map, true);
+
+// Gather the stacks we are expecting to appear as keys, and
+// check that there are no unexpected keys.
+let stacks = { };
+
+map.forEach((v, k) => {
+  if (k === 'noStack') {
+    // No need to save this key.
+  } else if (k.functionDisplayName === 'f' &&
+             k.parent.functionDisplayName === null) {
+    stacks.f = k;
+  } else if (k.functionDisplayName === 'f' &&
+             k.parent.functionDisplayName === 'g' &&
+             k.parent.parent.functionDisplayName === null) {
+    stacks.fg = k;
+  } else if (k.functionDisplayName === 'f' &&
+             k.parent.functionDisplayName === 'h' &&
+             k.parent.parent.functionDisplayName === null) {
+    stacks.fh = k;
+  } else {
+    assertEq(true, false);
+  }
+});
+
+assertEq(map.get('noStack').label, 'no haz stack');
+assertEq(map.get('noStack').count, 1);
+
+assertEq(map.get(stacks.f).label, 'haz stack');
+assertEq(map.get(stacks.f).count, 20);
+
+assertEq(map.get(stacks.fg).label, 'haz stack');
+assertEq(map.get(stacks.fg).count, 10);
+
+assertEq(map.get(stacks.fh).label, 'haz stack');
+assertEq(map.get(stacks.fh).count, 5);