1 files changed, 64 insertions, 0 deletions
diff --git a/js/src/jsapi-tests/testPrivateGCThingValue.cpp b/js/src/jsapi-tests/testPrivateGCThingValue.cpp
new file mode 100644
index 0000000000..a4560b68d2
--- /dev/null
+++ b/js/src/jsapi-tests/testPrivateGCThingValue.cpp
@@ -0,0 +1,64 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ */
+/* 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/. */
+
+#include "mozilla/Utf8.h"  // mozilla::Utf8Unit
+
+#include "jsapi.h"
+
+#include "js/CompilationAndEvaluation.h"  // JS::Compile
+#include "js/HeapAPI.h"
+#include "js/SourceText.h"  // JS::Source{Ownership,Text}
+#include "jsapi-tests/tests.h"
+#include "util/Text.h"
+
+class TestTracer final : public JS::CallbackTracer {
+  void onChild(JS::GCCellPtr thing, const char* name) override {
+    if (thing.asCell() == expectedCell && thing.kind() == expectedKind) {
+      found = true;
+    }
+  }
+
+ public:
+  js::gc::Cell* expectedCell;
+  JS::TraceKind expectedKind;
+  bool found;
+
+  explicit TestTracer(JSContext* cx)
+      : JS::CallbackTracer(cx),
+        expectedCell(nullptr),
+        expectedKind(static_cast<JS::TraceKind>(0)),
+        found(false) {}
+};
+
+static const JSClass TestClass = {"TestClass", JSCLASS_HAS_RESERVED_SLOTS(1)};
+
+BEGIN_TEST(testPrivateGCThingValue) {
+  JS::RootedObject obj(cx, JS_NewObject(cx, &TestClass));
+  CHECK(obj);
+
+  // Make a JSScript to stick into a PrivateGCThingValue.
+  static const char code[] = "'objet petit a'";
+
+  JS::CompileOptions options(cx);
+  options.setFileAndLine(__FILE__, __LINE__);
+
+  JS::SourceText<mozilla::Utf8Unit> srcBuf;
+  CHECK(srcBuf.init(cx, code, js_strlen(code), JS::SourceOwnership::Borrowed));
+
+  JS::RootedScript script(cx, JS::Compile(cx, options, srcBuf));
+  CHECK(script);
+  JS_SetReservedSlot(obj, 0, PrivateGCThingValue(script));
+
+  TestTracer trc(cx);
+  trc.expectedCell = script;
+  trc.expectedKind = JS::TraceKind::Script;
+  JS::TraceChildren(&trc, JS::GCCellPtr(obj, JS::TraceKind::Object));
+  CHECK(trc.found);
+
+  return true;
+}
+END_TEST(testPrivateGCThingValue)