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-rw-r--r--js/src/jsapi-tests/testGCStoreBufferRemoval.cpp111
1 files changed, 111 insertions, 0 deletions
diff --git a/js/src/jsapi-tests/testGCStoreBufferRemoval.cpp b/js/src/jsapi-tests/testGCStoreBufferRemoval.cpp
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+++ b/js/src/jsapi-tests/testGCStoreBufferRemoval.cpp
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+/* -*- 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 "gc/Barrier.h"
+#include "js/GCAPI.h"
+#include "jsapi-tests/tests.h"
+
+using namespace JS;
+using namespace js;
+
+// Name this constant without creating a GC hazard.
+#define BAD_OBJECT_PTR reinterpret_cast<JSObject*>(1)
+
+BEGIN_TEST(testGCStoreBufferRemoval) {
+ // Sanity check - objects start in the nursery and then become tenured.
+ JS_GC(cx);
+ JS::RootedObject obj(cx, NurseryObject());
+ CHECK(js::gc::IsInsideNursery(obj.get()));
+ JS_GC(cx);
+ CHECK(!js::gc::IsInsideNursery(obj.get()));
+ JS::RootedObject tenuredObject(cx, obj);
+
+ // Test removal of store buffer entries added by HeapPtr<T>.
+ {
+ JSObject* punnedPtr = nullptr;
+ HeapPtr<JSObject*>* relocPtr =
+ reinterpret_cast<HeapPtr<JSObject*>*>(&punnedPtr);
+ new (relocPtr) HeapPtr<JSObject*>;
+ *relocPtr = NurseryObject();
+ relocPtr->~HeapPtr<JSObject*>();
+ punnedPtr = BAD_OBJECT_PTR;
+ JS_GC(cx);
+
+ new (relocPtr) HeapPtr<JSObject*>;
+ *relocPtr = NurseryObject();
+ *relocPtr = tenuredObject;
+ relocPtr->~HeapPtr<JSObject*>();
+ punnedPtr = BAD_OBJECT_PTR;
+ JS_GC(cx);
+
+ new (relocPtr) HeapPtr<JSObject*>;
+ *relocPtr = NurseryObject();
+ *relocPtr = nullptr;
+ relocPtr->~HeapPtr<JSObject*>();
+ punnedPtr = BAD_OBJECT_PTR;
+ JS_GC(cx);
+ }
+
+ // Test removal of store buffer entries added by HeapPtr<Value>.
+ {
+ Value punnedValue;
+ HeapPtr<Value>* relocValue =
+ reinterpret_cast<HeapPtr<Value>*>(&punnedValue);
+ new (relocValue) HeapPtr<Value>;
+ *relocValue = ObjectValue(*NurseryObject());
+ relocValue->~HeapPtr<Value>();
+ punnedValue = js::PoisonedObjectValue(0x48);
+ JS_GC(cx);
+
+ new (relocValue) HeapPtr<Value>;
+ *relocValue = ObjectValue(*NurseryObject());
+ *relocValue = ObjectValue(*tenuredObject);
+ relocValue->~HeapPtr<Value>();
+ punnedValue = js::PoisonedObjectValue(0x48);
+ JS_GC(cx);
+
+ new (relocValue) HeapPtr<Value>;
+ *relocValue = ObjectValue(*NurseryObject());
+ *relocValue = NullValue();
+ relocValue->~HeapPtr<Value>();
+ punnedValue = js::PoisonedObjectValue(0x48);
+ JS_GC(cx);
+ }
+
+ // Test removal of store buffer entries added by Heap<T>.
+ {
+ JSObject* punnedPtr = nullptr;
+ JS::Heap<JSObject*>* heapPtr =
+ reinterpret_cast<JS::Heap<JSObject*>*>(&punnedPtr);
+ new (heapPtr) JS::Heap<JSObject*>;
+ *heapPtr = NurseryObject();
+ heapPtr->~Heap<JSObject*>();
+ punnedPtr = BAD_OBJECT_PTR;
+ JS_GC(cx);
+
+ new (heapPtr) JS::Heap<JSObject*>;
+ *heapPtr = NurseryObject();
+ *heapPtr = tenuredObject;
+ heapPtr->~Heap<JSObject*>();
+ punnedPtr = BAD_OBJECT_PTR;
+ JS_GC(cx);
+
+ new (heapPtr) JS::Heap<JSObject*>;
+ *heapPtr = NurseryObject();
+ *heapPtr = nullptr;
+ heapPtr->~Heap<JSObject*>();
+ punnedPtr = BAD_OBJECT_PTR;
+ JS_GC(cx);
+ }
+
+ return true;
+}
+
+JSObject* NurseryObject() { return JS_NewPlainObject(cx); }
+END_TEST(testGCStoreBufferRemoval)
+
+#undef BAD_OBJECT_PTR