1 // Copyright 2011 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 #include "v8.h" 29 30 #include "global-handles.h" 31 #include "snapshot.h" 32 #include "cctest.h" 33 34 using namespace v8::internal; 35 36 37 static Handle<JSWeakMap> AllocateJSWeakMap() { 38 Handle<Map> map = FACTORY->NewMap(JS_WEAK_MAP_TYPE, JSWeakMap::kSize); 39 Handle<JSObject> weakmap_obj = FACTORY->NewJSObjectFromMap(map); 40 Handle<JSWeakMap> weakmap(JSWeakMap::cast(*weakmap_obj)); 41 // Do not use handles for the hash table, it would make entries strong. 42 Object* table_obj = ObjectHashTable::Allocate(1)->ToObjectChecked(); 43 ObjectHashTable* table = ObjectHashTable::cast(table_obj); 44 weakmap->set_table(table); 45 weakmap->set_next(Smi::FromInt(0)); 46 return weakmap; 47 } 48 49 static void PutIntoWeakMap(Handle<JSWeakMap> weakmap, 50 Handle<JSObject> key, 51 int value) { 52 Handle<ObjectHashTable> table = PutIntoObjectHashTable( 53 Handle<ObjectHashTable>(ObjectHashTable::cast(weakmap->table())), 54 Handle<JSObject>(JSObject::cast(*key)), 55 Handle<Smi>(Smi::FromInt(value))); 56 weakmap->set_table(*table); 57 } 58 59 static int NumberOfWeakCalls = 0; 60 static void WeakPointerCallback(v8::Persistent<v8::Value> handle, void* id) { 61 ASSERT(id == reinterpret_cast<void*>(1234)); 62 NumberOfWeakCalls++; 63 handle.Dispose(); 64 } 65 66 67 TEST(Weakness) { 68 LocalContext context; 69 v8::HandleScope scope; 70 Handle<JSWeakMap> weakmap = AllocateJSWeakMap(); 71 GlobalHandles* global_handles = Isolate::Current()->global_handles(); 72 73 // Keep global reference to the key. 74 Handle<Object> key; 75 { 76 v8::HandleScope scope; 77 Handle<Map> map = FACTORY->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); 78 Handle<JSObject> object = FACTORY->NewJSObjectFromMap(map); 79 key = global_handles->Create(*object); 80 } 81 CHECK(!global_handles->IsWeak(key.location())); 82 83 // Put entry into weak map. 84 { 85 v8::HandleScope scope; 86 PutIntoWeakMap(weakmap, Handle<JSObject>(JSObject::cast(*key)), 23); 87 } 88 CHECK_EQ(1, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); 89 90 // Force a full GC. 91 HEAP->CollectAllGarbage(false); 92 CHECK_EQ(0, NumberOfWeakCalls); 93 CHECK_EQ(1, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); 94 CHECK_EQ( 95 0, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); 96 97 // Make the global reference to the key weak. 98 { 99 v8::HandleScope scope; 100 global_handles->MakeWeak(key.location(), 101 reinterpret_cast<void*>(1234), 102 &WeakPointerCallback); 103 } 104 CHECK(global_handles->IsWeak(key.location())); 105 106 // Force a full GC. 107 // Perform two consecutive GCs because the first one will only clear 108 // weak references whereas the second one will also clear weak maps. 109 HEAP->CollectAllGarbage(false); 110 CHECK_EQ(1, NumberOfWeakCalls); 111 CHECK_EQ(1, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); 112 CHECK_EQ( 113 0, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); 114 HEAP->CollectAllGarbage(false); 115 CHECK_EQ(1, NumberOfWeakCalls); 116 CHECK_EQ(0, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); 117 CHECK_EQ( 118 1, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); 119 } 120 121 122 TEST(Shrinking) { 123 LocalContext context; 124 v8::HandleScope scope; 125 Handle<JSWeakMap> weakmap = AllocateJSWeakMap(); 126 127 // Check initial capacity. 128 CHECK_EQ(32, ObjectHashTable::cast(weakmap->table())->Capacity()); 129 130 // Fill up weak map to trigger capacity change. 131 { 132 v8::HandleScope scope; 133 Handle<Map> map = FACTORY->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); 134 for (int i = 0; i < 32; i++) { 135 Handle<JSObject> object = FACTORY->NewJSObjectFromMap(map); 136 PutIntoWeakMap(weakmap, object, i); 137 } 138 } 139 140 // Check increased capacity. 141 CHECK_EQ(128, ObjectHashTable::cast(weakmap->table())->Capacity()); 142 143 // Force a full GC. 144 CHECK_EQ(32, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); 145 CHECK_EQ( 146 0, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); 147 HEAP->CollectAllGarbage(false); 148 CHECK_EQ(0, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); 149 CHECK_EQ( 150 32, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); 151 152 // Check shrunk capacity. 153 CHECK_EQ(32, ObjectHashTable::cast(weakmap->table())->Capacity()); 154 } 155
