// 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 <utility> #include "src/v8.h" #include "src/global-handles.h" #include "test/cctest/cctest.h" #include "test/cctest/heap/heap-utils.h" using namespace v8::internal; static Isolate* GetIsolateFrom(LocalContext* context) { return reinterpret_cast<Isolate*>((*context)->GetIsolate()); } static Handle<JSWeakMap> AllocateJSWeakMap(Isolate* isolate) { Handle<JSWeakMap> weakmap = isolate->factory()->NewJSWeakMap(); // Do not leak handles for the hash table, it would make entries strong. { HandleScope scope(isolate); Handle<ObjectHashTable> table = ObjectHashTable::New(isolate, 1); weakmap->set_table(*table); } return weakmap; } static int NumberOfWeakCalls = 0; static void WeakPointerCallback(const v8::WeakCallbackInfo<void>& data) { std::pair<v8::Persistent<v8::Value>*, int>* p = reinterpret_cast<std::pair<v8::Persistent<v8::Value>*, int>*>( data.GetParameter()); CHECK_EQ(1234, p->second); NumberOfWeakCalls++; p->first->Reset(); } TEST(Weakness) { FLAG_incremental_marking = false; LocalContext context; Isolate* isolate = GetIsolateFrom(&context); Factory* factory = isolate->factory(); Heap* heap = isolate->heap(); HandleScope scope(isolate); Handle<JSWeakMap> weakmap = AllocateJSWeakMap(isolate); GlobalHandles* global_handles = isolate->global_handles(); // Keep global reference to the key. Handle<Object> key; { HandleScope scope(isolate); 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 two chained entries into weak map. { HandleScope scope(isolate); Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); Handle<JSObject> object = factory->NewJSObjectFromMap(map); Handle<Smi> smi(Smi::FromInt(23), isolate); int32_t hash = Object::GetOrCreateHash(isolate, key)->value(); JSWeakCollection::Set(weakmap, key, object, hash); int32_t object_hash = Object::GetOrCreateHash(isolate, object)->value(); JSWeakCollection::Set(weakmap, object, smi, object_hash); } CHECK_EQ(2, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); // Force a full GC. heap->CollectAllGarbage(false); CHECK_EQ(0, NumberOfWeakCalls); CHECK_EQ(2, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); CHECK_EQ( 0, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); // Make the global reference to the key weak. { HandleScope scope(isolate); std::pair<Handle<Object>*, int> handle_and_id(&key, 1234); GlobalHandles::MakeWeak( key.location(), reinterpret_cast<void*>(&handle_and_id), &WeakPointerCallback, v8::WeakCallbackType::kParameter); } CHECK(global_handles->IsWeak(key.location())); heap->CollectAllGarbage(false); CHECK_EQ(1, NumberOfWeakCalls); CHECK_EQ(0, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); CHECK_EQ(2, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); } TEST(Shrinking) { LocalContext context; Isolate* isolate = GetIsolateFrom(&context); Factory* factory = isolate->factory(); Heap* heap = isolate->heap(); HandleScope scope(isolate); Handle<JSWeakMap> weakmap = AllocateJSWeakMap(isolate); // Check initial capacity. CHECK_EQ(32, ObjectHashTable::cast(weakmap->table())->Capacity()); // Fill up weak map to trigger capacity change. { HandleScope scope(isolate); Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); for (int i = 0; i < 32; i++) { Handle<JSObject> object = factory->NewJSObjectFromMap(map); Handle<Smi> smi(Smi::FromInt(i), isolate); int32_t object_hash = Object::GetOrCreateHash(isolate, object)->value(); JSWeakCollection::Set(weakmap, object, smi, object_hash); } } // 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) { if (i::FLAG_never_compact) return; FLAG_always_compact = true; LocalContext context; Isolate* isolate = GetIsolateFrom(&context); Factory* factory = isolate->factory(); Heap* heap = isolate->heap(); HandleScope scope(isolate); Handle<JSFunction> function = factory->NewFunction( factory->function_string()); Handle<JSObject> key = factory->NewJSObject(function); Handle<JSWeakMap> weakmap = AllocateJSWeakMap(isolate); // Start second old-space page so that values land on evacuation candidate. Page* first_page = heap->old_space()->anchor()->next_page(); heap::SimulateFullSpace(heap->old_space()); // Fill up weak map with values on an evacuation candidate. { HandleScope scope(isolate); for (int i = 0; i < 32; i++) { Handle<JSObject> object = factory->NewJSObject(function, TENURED); CHECK(!heap->InNewSpace(*object)); CHECK(!first_page->Contains(object->address())); int32_t hash = Object::GetOrCreateHash(isolate, key)->value(); JSWeakCollection::Set(weakmap, key, object, hash); } } // Force compacting garbage collection. CHECK(FLAG_always_compact); heap->CollectAllGarbage(); } // 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) { if (i::FLAG_never_compact) return; FLAG_always_compact = true; #ifdef VERIFY_HEAP FLAG_verify_heap = true; #endif LocalContext context; Isolate* isolate = GetIsolateFrom(&context); Factory* factory = isolate->factory(); Heap* heap = isolate->heap(); HandleScope scope(isolate); Handle<JSFunction> function = factory->NewFunction( factory->function_string()); // Start second old-space page so that keys land on evacuation candidate. Page* first_page = heap->old_space()->anchor()->next_page(); heap::SimulateFullSpace(heap->old_space()); // 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])); CHECK(!first_page->Contains(keys[i]->address())); } Handle<JSWeakMap> weakmap = AllocateJSWeakMap(isolate); for (int i = 0; i < 32; i++) { Handle<Smi> smi(Smi::FromInt(i), isolate); int32_t hash = Object::GetOrCreateHash(isolate, keys[i])->value(); JSWeakCollection::Set(weakmap, keys[i], smi, hash); } // Force compacting garbage collection. The subsequent collections are used // to verify that key references were actually updated. CHECK(FLAG_always_compact); heap->CollectAllGarbage(); heap->CollectAllGarbage(); heap->CollectAllGarbage(); } TEST(Regress399527) { CcTest::InitializeVM(); v8::HandleScope scope(CcTest::isolate()); Isolate* isolate = CcTest::i_isolate(); Heap* heap = isolate->heap(); { HandleScope scope(isolate); AllocateJSWeakMap(isolate); heap::SimulateIncrementalMarking(heap); } // The weak map is marked black here but leaving the handle scope will make // the object unreachable. Aborting incremental marking will clear all the // marking bits which makes the weak map garbage. heap->CollectAllGarbage(); }