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-rw-r--r--js/src/jsapi-tests/testWeakMap.cpp258
1 files changed, 258 insertions, 0 deletions
diff --git a/js/src/jsapi-tests/testWeakMap.cpp b/js/src/jsapi-tests/testWeakMap.cpp
new file mode 100644
index 000000000..8ee78ad73
--- /dev/null
+++ b/js/src/jsapi-tests/testWeakMap.cpp
@@ -0,0 +1,258 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+* vim: set ts=8 sts=4 et sw=4 tw=99:
+*/
+/* 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 "jscompartment.h"
+
+#include "gc/Zone.h"
+
+#include "jsapi-tests/tests.h"
+
+JSObject* keyDelegate = nullptr;
+
+BEGIN_TEST(testWeakMap_basicOperations)
+{
+ JS::RootedObject map(cx, JS::NewWeakMapObject(cx));
+ CHECK(IsWeakMapObject(map));
+
+ JS::RootedObject key(cx, newKey());
+ CHECK(key);
+ CHECK(!IsWeakMapObject(key));
+
+ JS::RootedValue r(cx);
+ CHECK(GetWeakMapEntry(cx, map, key, &r));
+ CHECK(r.isUndefined());
+
+ CHECK(checkSize(map, 0));
+
+ JS::RootedValue val(cx, JS::Int32Value(1));
+ CHECK(SetWeakMapEntry(cx, map, key, val));
+
+ CHECK(GetWeakMapEntry(cx, map, key, &r));
+ CHECK(r == val);
+ CHECK(checkSize(map, 1));
+
+ JS_GC(cx);
+
+ CHECK(GetWeakMapEntry(cx, map, key, &r));
+ CHECK(r == val);
+ CHECK(checkSize(map, 1));
+
+ key = nullptr;
+ JS_GC(cx);
+
+ CHECK(checkSize(map, 0));
+
+ return true;
+}
+
+JSObject* newKey()
+{
+ return JS_NewPlainObject(cx);
+}
+
+bool
+checkSize(JS::HandleObject map, uint32_t expected)
+{
+ JS::RootedObject keys(cx);
+ CHECK(JS_NondeterministicGetWeakMapKeys(cx, map, &keys));
+
+ uint32_t length;
+ CHECK(JS_GetArrayLength(cx, keys, &length));
+ CHECK(length == expected);
+
+ return true;
+}
+END_TEST(testWeakMap_basicOperations)
+
+BEGIN_TEST(testWeakMap_keyDelegates)
+{
+ JS_SetGCParameter(cx, JSGC_MODE, JSGC_MODE_INCREMENTAL);
+ JS_GC(cx);
+ JS::RootedObject map(cx, JS::NewWeakMapObject(cx));
+ CHECK(map);
+
+ JS::RootedObject key(cx, newKey());
+ CHECK(key);
+
+ JS::RootedObject delegate(cx, newDelegate());
+ CHECK(delegate);
+ keyDelegate = delegate;
+
+ JS::RootedObject delegateRoot(cx);
+ {
+ JSAutoCompartment ac(cx, delegate);
+ delegateRoot = JS_NewPlainObject(cx);
+ CHECK(delegateRoot);
+ JS::RootedValue delegateValue(cx, JS::ObjectValue(*delegate));
+ CHECK(JS_DefineProperty(cx, delegateRoot, "delegate", delegateValue, 0));
+ }
+ delegate = nullptr;
+
+ /*
+ * Perform an incremental GC, introducing an unmarked CCW to force the map
+ * zone to finish marking before the delegate zone.
+ */
+ CHECK(newCCW(map, delegateRoot));
+ js::SliceBudget budget(js::WorkBudget(1000000));
+ cx->gc.startDebugGC(GC_NORMAL, budget);
+ while (JS::IsIncrementalGCInProgress(cx))
+ cx->gc.debugGCSlice(budget);
+#ifdef DEBUG
+ CHECK(map->zone()->lastZoneGroupIndex() < delegateRoot->zone()->lastZoneGroupIndex());
+#endif
+
+ /* Add our entry to the weakmap. */
+ JS::RootedValue val(cx, JS::Int32Value(1));
+ CHECK(SetWeakMapEntry(cx, map, key, val));
+ CHECK(checkSize(map, 1));
+
+ /* Check the delegate keeps the entry alive even if the key is not reachable. */
+ key = nullptr;
+ CHECK(newCCW(map, delegateRoot));
+ budget = js::SliceBudget(js::WorkBudget(100000));
+ cx->gc.startDebugGC(GC_NORMAL, budget);
+ while (JS::IsIncrementalGCInProgress(cx))
+ cx->gc.debugGCSlice(budget);
+ CHECK(checkSize(map, 1));
+
+ /*
+ * Check that the zones finished marking at the same time, which is
+ * necessary because of the presence of the delegate and the CCW.
+ */
+#ifdef DEBUG
+ CHECK(map->zone()->lastZoneGroupIndex() == delegateRoot->zone()->lastZoneGroupIndex());
+#endif
+
+ /* Check that when the delegate becomes unreachable the entry is removed. */
+ delegateRoot = nullptr;
+ keyDelegate = nullptr;
+ JS_GC(cx);
+ CHECK(checkSize(map, 0));
+
+ return true;
+}
+
+static void DelegateObjectMoved(JSObject* obj, const JSObject* old)
+{
+ if (!keyDelegate)
+ return; // Object got moved before we set keyDelegate to point to it.
+
+ MOZ_RELEASE_ASSERT(keyDelegate == old);
+ keyDelegate = obj;
+}
+
+static JSObject* GetKeyDelegate(JSObject* obj)
+{
+ return keyDelegate;
+}
+
+JSObject* newKey()
+{
+ static const js::ClassExtension keyClassExtension = {
+ GetKeyDelegate
+ };
+
+ static const js::Class keyClass = {
+ "keyWithDelegate",
+ JSCLASS_HAS_PRIVATE | JSCLASS_HAS_RESERVED_SLOTS(1),
+ JS_NULL_CLASS_OPS,
+ JS_NULL_CLASS_SPEC,
+ &keyClassExtension,
+ JS_NULL_OBJECT_OPS
+ };
+
+ JS::RootedObject key(cx, JS_NewObject(cx, Jsvalify(&keyClass)));
+ if (!key)
+ return nullptr;
+
+ return key;
+}
+
+JSObject* newCCW(JS::HandleObject sourceZone, JS::HandleObject destZone)
+{
+ /*
+ * Now ensure that this zone will be swept first by adding a cross
+ * compartment wrapper to a new objct in the same zone as the
+ * delegate obejct.
+ */
+ JS::RootedObject object(cx);
+ {
+ JSAutoCompartment ac(cx, destZone);
+ object = JS_NewPlainObject(cx);
+ if (!object)
+ return nullptr;
+ }
+ {
+ JSAutoCompartment ac(cx, sourceZone);
+ if (!JS_WrapObject(cx, &object))
+ return nullptr;
+ }
+
+ // In order to test the SCC algorithm, we need the wrapper/wrappee to be
+ // tenured.
+ cx->gc.evictNursery();
+
+ return object;
+}
+
+JSObject* newDelegate()
+{
+ static const js::ClassOps delegateClassOps = {
+ nullptr, /* addProperty */
+ nullptr, /* delProperty */
+ nullptr, /* getProperty */
+ nullptr, /* setProperty */
+ nullptr, /* enumerate */
+ nullptr, /* resolve */
+ nullptr, /* mayResolve */
+ nullptr, /* finalize */
+ nullptr, /* call */
+ nullptr, /* hasInstance */
+ nullptr, /* construct */
+ JS_GlobalObjectTraceHook,
+ };
+
+ static const js::ClassExtension delegateClassExtension = {
+ nullptr,
+ DelegateObjectMoved
+ };
+
+ static const js::Class delegateClass = {
+ "delegate",
+ JSCLASS_GLOBAL_FLAGS | JSCLASS_HAS_RESERVED_SLOTS(1),
+ &delegateClassOps,
+ JS_NULL_CLASS_SPEC,
+ &delegateClassExtension,
+ JS_NULL_OBJECT_OPS
+ };
+
+ /* Create the global object. */
+ JS::CompartmentOptions options;
+ options.behaviors().setVersion(JSVERSION_LATEST);
+
+ JS::RootedObject global(cx, JS_NewGlobalObject(cx, Jsvalify(&delegateClass), nullptr,
+ JS::FireOnNewGlobalHook, options));
+ if (!global)
+ return nullptr;
+
+ JS_SetReservedSlot(global, 0, JS::Int32Value(42));
+ return global;
+}
+
+bool
+checkSize(JS::HandleObject map, uint32_t expected)
+{
+ JS::RootedObject keys(cx);
+ CHECK(JS_NondeterministicGetWeakMapKeys(cx, map, &keys));
+
+ uint32_t length;
+ CHECK(JS_GetArrayLength(cx, keys, &length));
+ CHECK(length == expected);
+
+ return true;
+}
+END_TEST(testWeakMap_keyDelegates)