1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/jsapi-tests/testGCHeapPostBarriers.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,82 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 +* vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 +*/
1.7 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.8 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.9 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.10 +
1.11 +#ifdef JSGC_GENERATIONAL
1.12 +
1.13 +#include "js/RootingAPI.h"
1.14 +#include "jsapi-tests/tests.h"
1.15 +
1.16 +BEGIN_TEST(testGCHeapPostBarriers)
1.17 +{
1.18 + /* Sanity check - objects start in the nursery and then become tenured. */
1.19 + JS_GC(cx->runtime());
1.20 + JS::RootedObject obj(cx, NurseryObject());
1.21 + CHECK(js::gc::IsInsideNursery(obj.get()));
1.22 + JS_GC(cx->runtime());
1.23 + CHECK(!js::gc::IsInsideNursery(obj.get()));
1.24 + JS::RootedObject tenuredObject(cx, obj);
1.25 +
1.26 + /* Currently JSObject and JSFunction objects are nursery allocated. */
1.27 + CHECK(TestHeapPostBarriers(NurseryObject()));
1.28 + CHECK(TestHeapPostBarriers(NurseryFunction()));
1.29 +
1.30 + return true;
1.31 +}
1.32 +
1.33 +template <typename T>
1.34 +bool
1.35 +TestHeapPostBarriers(T initialObj)
1.36 +{
1.37 + CHECK(initialObj != nullptr);
1.38 + CHECK(js::gc::IsInsideNursery(initialObj));
1.39 +
1.40 + /* Construct Heap<> wrapper. */
1.41 + JS::Heap<T> *heapData = new JS::Heap<T>();
1.42 + CHECK(heapData);
1.43 + CHECK(heapData->get() == nullptr);
1.44 + heapData->set(initialObj);
1.45 +
1.46 + /* Store the pointer as an integer so that the hazard analysis will miss it. */
1.47 + uintptr_t initialObjAsInt = uintptr_t(initialObj);
1.48 +
1.49 + /* Perform minor GC and check heap wrapper is udated with new pointer. */
1.50 + js::MinorGC(cx, JS::gcreason::API);
1.51 + CHECK(uintptr_t(heapData->get()) != initialObjAsInt);
1.52 + CHECK(!js::gc::IsInsideNursery(heapData->get()));
1.53 +
1.54 + /* Check object is definitely still alive. */
1.55 + JS::Rooted<T> obj(cx, heapData->get());
1.56 + JS::RootedValue value(cx);
1.57 + CHECK(JS_GetProperty(cx, obj, "x", &value));
1.58 + CHECK(value.isInt32());
1.59 + CHECK(value.toInt32() == 42);
1.60 +
1.61 + delete heapData;
1.62 + return true;
1.63 +}
1.64 +
1.65 +JSObject *NurseryObject()
1.66 +{
1.67 + JS::RootedObject obj(cx, JS_NewObject(cx, nullptr, JS::NullPtr(), JS::NullPtr()));
1.68 + if (!obj)
1.69 + return nullptr;
1.70 + JS_DefineProperty(cx, obj, "x", 42, 0);
1.71 + return obj;
1.72 +}
1.73 +
1.74 +JSFunction *NurseryFunction()
1.75 +{
1.76 + /*
1.77 + * We don't actually use the function as a function, so here we cheat and
1.78 + * cast a JSObject.
1.79 + */
1.80 + return static_cast<JSFunction *>(NurseryObject());
1.81 +}
1.82 +
1.83 +END_TEST(testGCHeapPostBarriers)
1.84 +
1.85 +#endif
