1 files changed, 73 insertions, 0 deletions
diff --git a/dom/heapsnapshot/tests/gtest/DoesCrossCompartmentBoundaries.cpp b/dom/heapsnapshot/tests/gtest/DoesCrossCompartmentBoundaries.cpp
new file mode 100644
index 000000000..bc517d6d9
--- /dev/null
+++ b/dom/heapsnapshot/tests/gtest/DoesCrossCompartmentBoundaries.cpp
@@ -0,0 +1,73 @@
+/* -*-  Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Test that heap snapshots cross compartment boundaries when expected.
+
+#include "DevTools.h"
+
+DEF_TEST(DoesCrossCompartmentBoundaries, {
+    // Create a new global to get a new compartment.
+    JS::CompartmentOptions options;
+    JS::RootedObject newGlobal(cx, JS_NewGlobalObject(cx,
+                                                      getGlobalClass(),
+                                                      nullptr,
+                                                      JS::FireOnNewGlobalHook,
+                                                      options));
+    ASSERT_TRUE(newGlobal);
+    JSCompartment* newCompartment = nullptr;
+    {
+      JSAutoCompartment ac(cx, newGlobal);
+      ASSERT_TRUE(JS_InitStandardClasses(cx, newGlobal));
+      newCompartment = js::GetContextCompartment(cx);
+    }
+    ASSERT_TRUE(newCompartment);
+    ASSERT_NE(newCompartment, compartment);
+
+    // Our set of target compartments is both the old and new compartments.
+    JS::CompartmentSet targetCompartments;
+    ASSERT_TRUE(targetCompartments.init());
+    ASSERT_TRUE(targetCompartments.put(compartment));
+    ASSERT_TRUE(targetCompartments.put(newCompartment));
+
+    FakeNode nodeA;
+    FakeNode nodeB;
+    FakeNode nodeC;
+    FakeNode nodeD;
+
+    nodeA.compartment = compartment;
+    nodeB.compartment = nullptr;
+    nodeC.compartment = newCompartment;
+    nodeD.compartment = nullptr;
+
+    AddEdge(nodeA, nodeB);
+    AddEdge(nodeA, nodeC);
+    AddEdge(nodeB, nodeD);
+
+    ::testing::NiceMock<MockWriter> writer;
+
+    // Should serialize nodeA, because it is in one of our target compartments.
+    ExpectWriteNode(writer, nodeA);
+
+    // Should serialize nodeB, because it doesn't belong to a compartment and is
+    // therefore assumed to be shared.
+    ExpectWriteNode(writer, nodeB);
+
+    // Should also serialize nodeC, which is in our target compartments, but a
+    // different compartment than A.
+    ExpectWriteNode(writer, nodeC);
+
+    // Should serialize nodeD because it's reachable via B and both nodes B and D
+    // don't belong to a specific compartment.
+    ExpectWriteNode(writer, nodeD);
+
+    JS::AutoCheckCannotGC noGC(cx);
+
+    ASSERT_TRUE(WriteHeapGraph(cx,
+                               JS::ubi::Node(&nodeA),
+                               writer,
+                               /* wantNames = */ false,
+                               &targetCompartments,
+                               noGC));
+  });