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-rw-r--r--xpcom/glue/tests/gtest/TestGCPostBarriers.cpp140
1 files changed, 140 insertions, 0 deletions
diff --git a/xpcom/glue/tests/gtest/TestGCPostBarriers.cpp b/xpcom/glue/tests/gtest/TestGCPostBarriers.cpp
new file mode 100644
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+++ b/xpcom/glue/tests/gtest/TestGCPostBarriers.cpp
@@ -0,0 +1,140 @@
+/* -*- 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/. */
+
+/*
+ * Tests that generational garbage collection post-barriers are correctly
+ * implemented for nsTArrays that contain JavaScript Values.
+ */
+
+#include "jsapi.h"
+#include "nsTArray.h"
+
+#include "gtest/gtest.h"
+
+#include "js/TracingAPI.h"
+#include "js/HeapAPI.h"
+
+#include "mozilla/CycleCollectedJSContext.h"
+
+using namespace JS;
+using namespace mozilla;
+
+template<class ArrayT>
+static void
+TraceArray(JSTracer* trc, void* data)
+{
+ ArrayT* array = static_cast<ArrayT *>(data);
+ for (unsigned i = 0; i < array->Length(); ++i)
+ JS::TraceEdge(trc, &array->ElementAt(i), "array-element");
+}
+
+/*
+ * Use arrays with initial size much smaller than the final number of elements
+ * to test that moving Heap<T> elements works correctly.
+ */
+const size_t ElementCount = 100;
+const size_t InitialElements = ElementCount / 10;
+
+template<class ArrayT>
+static void
+RunTest(JSContext* cx, ArrayT* array)
+{
+ JS_GC(cx);
+
+ ASSERT_TRUE(array != nullptr);
+ JS_AddExtraGCRootsTracer(cx, TraceArray<ArrayT>, array);
+
+ /*
+ * Create the array and fill it with new JS objects. With GGC these will be
+ * allocated in the nursery.
+ */
+ RootedValue value(cx);
+ const char* property = "foo";
+ for (size_t i = 0; i < ElementCount; ++i) {
+ RootedObject obj(cx, JS_NewPlainObject(cx));
+ ASSERT_FALSE(JS::ObjectIsTenured(obj));
+ value = Int32Value(i);
+ ASSERT_TRUE(JS_SetProperty(cx, obj, property, value));
+ ASSERT_TRUE(array->AppendElement(obj, fallible));
+ }
+
+ /*
+ * If postbarriers are not working, we will crash here when we try to mark
+ * objects that have been moved to the tenured heap.
+ */
+ JS_GC(cx);
+
+ /*
+ * Sanity check that our array contains what we expect.
+ */
+ for (size_t i = 0; i < ElementCount; ++i) {
+ RootedObject obj(cx, array->ElementAt(i));
+ ASSERT_TRUE(JS::ObjectIsTenured(obj));
+ ASSERT_TRUE(JS_GetProperty(cx, obj, property, &value));
+ ASSERT_TRUE(value.isInt32());
+ ASSERT_EQ(static_cast<int32_t>(i), value.toInt32());
+ }
+
+ JS_RemoveExtraGCRootsTracer(cx, TraceArray<ArrayT>, array);
+}
+
+static void
+CreateGlobalAndRunTest(JSContext* cx)
+{
+ static const JSClassOps GlobalClassOps = {
+ nullptr, nullptr, nullptr, nullptr,
+ nullptr, nullptr, nullptr, nullptr,
+ nullptr, nullptr, nullptr,
+ JS_GlobalObjectTraceHook
+ };
+
+ static const JSClass GlobalClass = {
+ "global", JSCLASS_GLOBAL_FLAGS,
+ &GlobalClassOps
+ };
+
+ JS::CompartmentOptions options;
+ options.behaviors().setVersion(JSVERSION_LATEST);
+ JS::PersistentRootedObject global(cx);
+ global = JS_NewGlobalObject(cx, &GlobalClass, nullptr, JS::FireOnNewGlobalHook, options);
+ ASSERT_TRUE(global != nullptr);
+
+ JSCompartment *oldCompartment = JS_EnterCompartment(cx, global);
+
+ typedef Heap<JSObject*> ElementT;
+
+ {
+ nsTArray<ElementT>* array = new nsTArray<ElementT>(InitialElements);
+ RunTest(cx, array);
+ delete array;
+ }
+
+ {
+ FallibleTArray<ElementT>* array = new FallibleTArray<ElementT>(InitialElements);
+ RunTest(cx, array);
+ delete array;
+ }
+
+ {
+ AutoTArray<ElementT, InitialElements> array;
+ RunTest(cx, &array);
+ }
+
+ JS_LeaveCompartment(cx, oldCompartment);
+}
+
+TEST(GCPostBarriers, nsTArray) {
+ CycleCollectedJSContext* ccjscx = CycleCollectedJSContext::Get();
+ ASSERT_TRUE(ccjscx != nullptr);
+ JSContext* cx = ccjscx->Context();
+ ASSERT_TRUE(cx != nullptr);
+
+ JS_BeginRequest(cx);
+
+ CreateGlobalAndRunTest(cx);
+
+ JS_EndRequest(cx);
+}