1 files changed, 76 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Memory-trackingAllocationSites-03.js b/js/src/jit-test/tests/debug/Memory-trackingAllocationSites-03.js
new file mode 100644
index 0000000000..62205b8249
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Memory-trackingAllocationSites-03.js
@@ -0,0 +1,76 @@
+// Test that multiple Debuggers behave reasonably.
+
+load(libdir + "asserts.js");
+
+let dbg1, dbg2, root1, root2;
+
+function isTrackingAllocations(global, dbgObj) {
+  const site = dbgObj.makeDebuggeeValue(global.eval("({})")).allocationSite;
+  if (site) {
+    assertEq(typeof site, "object");
+  }
+  return !!site;
+}
+
+function test(name, fn) {
+  print();
+  print(name);
+
+  // Reset state.
+  root1 = newGlobal({newCompartment: true});
+  root2 = newGlobal({newCompartment: true});
+  dbg1 = new Debugger;
+  dbg2 = new Debugger;
+
+  // Run the test.
+  fn();
+
+  print("  OK");
+}
+
+test("Can track allocations even if a different debugger is already tracking " +
+     "them.",
+     () => {
+       let d1r1 = dbg1.addDebuggee(root1);
+       let d2r1 = dbg2.addDebuggee(root1);
+       dbg1.memory.trackingAllocationSites = true;
+       dbg2.memory.trackingAllocationSites = true;
+       assertEq(isTrackingAllocations(root1, d1r1), true);
+       assertEq(isTrackingAllocations(root1, d2r1), true);
+     });
+
+test("Removing root1 as a debuggee from all debuggers should disable the " +
+     "allocation hook.",
+     () => {
+       dbg1.memory.trackingAllocationSites = true;
+       let d1r1 = dbg1.addDebuggee(root1);
+       dbg1.removeAllDebuggees();
+       assertEq(isTrackingAllocations(root1, d1r1), false);
+     });
+
+test("Adding a new debuggee to a debugger that is tracking allocations should " +
+     "enable the hook for the new debuggee.",
+     () => {
+       dbg1.memory.trackingAllocationSites = true;
+       let d1r1 = dbg1.addDebuggee(root1);
+       assertEq(isTrackingAllocations(root1, d1r1), true);
+     });
+
+test("Setting trackingAllocationSites to true should throw if the debugger " +
+     "cannot install the allocation hooks for *every* debuggee.",
+     () => {
+       let d1r1 = dbg1.addDebuggee(root1);
+       let d1r2 = dbg1.addDebuggee(root2);
+
+       // Can't install allocation hooks for root2 with this set.
+       root2.enableShellAllocationMetadataBuilder();
+
+       assertThrowsInstanceOf(() => dbg1.memory.trackingAllocationSites = true,
+                              Error);
+
+       // And after it throws, its trackingAllocationSites accessor should reflect that
+       // allocation site tracking is still disabled in that Debugger.
+       assertEq(dbg1.memory.trackingAllocationSites, false);
+       assertEq(isTrackingAllocations(root1, d1r1), false);
+       assertEq(isTrackingAllocations(root2, d1r2), false);
+     });