| // Copyright 2011 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "v8.h" |
| |
| #include "global-handles.h" |
| #include "snapshot.h" |
| #include "cctest.h" |
| |
| using namespace v8::internal; |
| |
| |
| static Handle<JSWeakMap> AllocateJSWeakMap() { |
| Handle<Map> map = FACTORY->NewMap(JS_WEAK_MAP_TYPE, JSWeakMap::kSize); |
| Handle<JSObject> weakmap_obj = FACTORY->NewJSObjectFromMap(map); |
| Handle<JSWeakMap> weakmap(JSWeakMap::cast(*weakmap_obj)); |
| // Do not use handles for the hash table, it would make entries strong. |
| Object* table_obj = ObjectHashTable::Allocate(1)->ToObjectChecked(); |
| ObjectHashTable* table = ObjectHashTable::cast(table_obj); |
| weakmap->set_table(table); |
| weakmap->set_next(Smi::FromInt(0)); |
| return weakmap; |
| } |
| |
| static void PutIntoWeakMap(Handle<JSWeakMap> weakmap, |
| Handle<JSObject> key, |
| Handle<Object> value) { |
| Handle<ObjectHashTable> table = PutIntoObjectHashTable( |
| Handle<ObjectHashTable>(ObjectHashTable::cast(weakmap->table())), |
| Handle<JSObject>(JSObject::cast(*key)), |
| value); |
| weakmap->set_table(*table); |
| } |
| |
| static int NumberOfWeakCalls = 0; |
| static void WeakPointerCallback(v8::Persistent<v8::Value> handle, void* id) { |
| ASSERT(id == reinterpret_cast<void*>(1234)); |
| NumberOfWeakCalls++; |
| handle.Dispose(); |
| } |
| |
| |
| TEST(Weakness) { |
| FLAG_incremental_marking = false; |
| LocalContext context; |
| v8::HandleScope scope; |
| Handle<JSWeakMap> weakmap = AllocateJSWeakMap(); |
| GlobalHandles* global_handles = Isolate::Current()->global_handles(); |
| |
| // Keep global reference to the key. |
| Handle<Object> key; |
| { |
| v8::HandleScope scope; |
| Handle<Map> map = FACTORY->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); |
| Handle<JSObject> object = FACTORY->NewJSObjectFromMap(map); |
| key = global_handles->Create(*object); |
| } |
| CHECK(!global_handles->IsWeak(key.location())); |
| |
| // Put entry into weak map. |
| { |
| v8::HandleScope scope; |
| PutIntoWeakMap(weakmap, |
| Handle<JSObject>(JSObject::cast(*key)), |
| Handle<Smi>(Smi::FromInt(23))); |
| } |
| CHECK_EQ(1, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); |
| |
| // Force a full GC. |
| HEAP->CollectAllGarbage(false); |
| CHECK_EQ(0, NumberOfWeakCalls); |
| CHECK_EQ(1, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); |
| CHECK_EQ( |
| 0, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); |
| |
| // Make the global reference to the key weak. |
| { |
| v8::HandleScope scope; |
| global_handles->MakeWeak(key.location(), |
| reinterpret_cast<void*>(1234), |
| &WeakPointerCallback); |
| } |
| CHECK(global_handles->IsWeak(key.location())); |
| |
| // Force a full GC. |
| // Perform two consecutive GCs because the first one will only clear |
| // weak references whereas the second one will also clear weak maps. |
| HEAP->CollectAllGarbage(false); |
| CHECK_EQ(1, NumberOfWeakCalls); |
| CHECK_EQ(1, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); |
| CHECK_EQ( |
| 0, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); |
| HEAP->CollectAllGarbage(false); |
| CHECK_EQ(1, NumberOfWeakCalls); |
| CHECK_EQ(0, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); |
| CHECK_EQ( |
| 1, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); |
| } |
| |
| |
| TEST(Shrinking) { |
| LocalContext context; |
| v8::HandleScope scope; |
| Handle<JSWeakMap> weakmap = AllocateJSWeakMap(); |
| |
| // Check initial capacity. |
| CHECK_EQ(32, ObjectHashTable::cast(weakmap->table())->Capacity()); |
| |
| // Fill up weak map to trigger capacity change. |
| { |
| v8::HandleScope scope; |
| Handle<Map> map = FACTORY->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); |
| for (int i = 0; i < 32; i++) { |
| Handle<JSObject> object = FACTORY->NewJSObjectFromMap(map); |
| PutIntoWeakMap(weakmap, object, Handle<Smi>(Smi::FromInt(i))); |
| } |
| } |
| |
| // Check increased capacity. |
| CHECK_EQ(128, ObjectHashTable::cast(weakmap->table())->Capacity()); |
| |
| // Force a full GC. |
| CHECK_EQ(32, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); |
| CHECK_EQ( |
| 0, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); |
| HEAP->CollectAllGarbage(false); |
| CHECK_EQ(0, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); |
| CHECK_EQ( |
| 32, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); |
| |
| // Check shrunk capacity. |
| CHECK_EQ(32, ObjectHashTable::cast(weakmap->table())->Capacity()); |
| } |
| |
| |
| // Test that weak map values on an evacuation candidate which are not reachable |
| // by other paths are correctly recorded in the slots buffer. |
| TEST(Regress2060a) { |
| FLAG_always_compact = true; |
| LocalContext context; |
| v8::HandleScope scope; |
| Handle<JSFunction> function = |
| FACTORY->NewFunction(FACTORY->function_symbol(), FACTORY->null_value()); |
| Handle<JSObject> key = FACTORY->NewJSObject(function); |
| Handle<JSWeakMap> weakmap = AllocateJSWeakMap(); |
| |
| // Start second old-space page so that values land on evacuation candidate. |
| Page* first_page = HEAP->old_pointer_space()->anchor()->next_page(); |
| FACTORY->NewFixedArray(900 * KB / kPointerSize, TENURED); |
| |
| // Fill up weak map with values on an evacuation candidate. |
| { |
| v8::HandleScope scope; |
| for (int i = 0; i < 32; i++) { |
| Handle<JSObject> object = FACTORY->NewJSObject(function, TENURED); |
| CHECK(!HEAP->InNewSpace(object->address())); |
| CHECK(!first_page->Contains(object->address())); |
| PutIntoWeakMap(weakmap, key, object); |
| } |
| } |
| |
| // Force compacting garbage collection. |
| CHECK(FLAG_always_compact); |
| HEAP->CollectAllGarbage(Heap::kNoGCFlags); |
| } |
| |
| |
| // Test that weak map keys on an evacuation candidate which are reachable by |
| // other strong paths are correctly recorded in the slots buffer. |
| TEST(Regress2060b) { |
| FLAG_always_compact = true; |
| #ifdef VERIFY_HEAP |
| FLAG_verify_heap = true; |
| #endif |
| |
| LocalContext context; |
| v8::HandleScope scope; |
| Handle<JSFunction> function = |
| FACTORY->NewFunction(FACTORY->function_symbol(), FACTORY->null_value()); |
| |
| // Start second old-space page so that keys land on evacuation candidate. |
| Page* first_page = HEAP->old_pointer_space()->anchor()->next_page(); |
| FACTORY->NewFixedArray(900 * KB / kPointerSize, TENURED); |
| |
| // Fill up weak map with keys on an evacuation candidate. |
| Handle<JSObject> keys[32]; |
| for (int i = 0; i < 32; i++) { |
| keys[i] = FACTORY->NewJSObject(function, TENURED); |
| CHECK(!HEAP->InNewSpace(keys[i]->address())); |
| CHECK(!first_page->Contains(keys[i]->address())); |
| } |
| Handle<JSWeakMap> weakmap = AllocateJSWeakMap(); |
| for (int i = 0; i < 32; i++) { |
| PutIntoWeakMap(weakmap, keys[i], Handle<Smi>(Smi::FromInt(i))); |
| } |
| |
| // Force compacting garbage collection. The subsequent collections are used |
| // to verify that key references were actually updated. |
| CHECK(FLAG_always_compact); |
| HEAP->CollectAllGarbage(Heap::kNoGCFlags); |
| HEAP->CollectAllGarbage(Heap::kNoGCFlags); |
| HEAP->CollectAllGarbage(Heap::kNoGCFlags); |
| } |