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 Isolate* GetIsolateFrom(LocalContext* context) { 38 return reinterpret_cast<Isolate*>((*context)->GetIsolate()); 39 } 40 41 42 static Handle<JSWeakMap> AllocateJSWeakMap(Isolate* isolate) { 43 Factory* factory = isolate->factory(); 44 Heap* heap = isolate->heap(); 45 Handle<Map> map = factory->NewMap(JS_WEAK_MAP_TYPE, JSWeakMap::kSize); 46 Handle<JSObject> weakmap_obj = factory->NewJSObjectFromMap(map); 47 Handle<JSWeakMap> weakmap(JSWeakMap::cast(*weakmap_obj)); 48 // Do not use handles for the hash table, it would make entries strong. 49 Object* table_obj = ObjectHashTable::Allocate(heap, 1)->ToObjectChecked(); 50 ObjectHashTable* table = ObjectHashTable::cast(table_obj); 51 weakmap->set_table(table); 52 weakmap->set_next(Smi::FromInt(0)); 53 return weakmap; 54 } 55 56 static void PutIntoWeakMap(Handle<JSWeakMap> weakmap, 57 Handle<JSObject> key, 58 Handle<Object> value) { 59 Handle<ObjectHashTable> table = ObjectHashTable::Put( 60 Handle<ObjectHashTable>(ObjectHashTable::cast(weakmap->table())), 61 Handle<JSObject>(JSObject::cast(*key)), 62 value); 63 weakmap->set_table(*table); 64 } 65 66 static int NumberOfWeakCalls = 0; 67 static void WeakPointerCallback(v8::Isolate* isolate, 68 v8::Persistent<v8::Value>* handle, 69 void* id) { 70 ASSERT(id == reinterpret_cast<void*>(1234)); 71 NumberOfWeakCalls++; 72 handle->Reset(); 73 } 74 75 76 TEST(Weakness) { 77 FLAG_incremental_marking = false; 78 LocalContext context; 79 Isolate* isolate = GetIsolateFrom(&context); 80 Factory* factory = isolate->factory(); 81 Heap* heap = isolate->heap(); 82 HandleScope scope(isolate); 83 Handle<JSWeakMap> weakmap = AllocateJSWeakMap(isolate); 84 GlobalHandles* global_handles = isolate->global_handles(); 85 86 // Keep global reference to the key. 87 Handle<Object> key; 88 { 89 HandleScope scope(isolate); 90 Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); 91 Handle<JSObject> object = factory->NewJSObjectFromMap(map); 92 key = global_handles->Create(*object); 93 } 94 CHECK(!global_handles->IsWeak(key.location())); 95 96 // Put entry into weak map. 97 { 98 HandleScope scope(isolate); 99 PutIntoWeakMap(weakmap, 100 Handle<JSObject>(JSObject::cast(*key)), 101 Handle<Smi>(Smi::FromInt(23), isolate)); 102 } 103 CHECK_EQ(1, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); 104 105 // Force a full GC. 106 heap->CollectAllGarbage(false); 107 CHECK_EQ(0, NumberOfWeakCalls); 108 CHECK_EQ(1, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); 109 CHECK_EQ( 110 0, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); 111 112 // Make the global reference to the key weak. 113 { 114 HandleScope scope(isolate); 115 global_handles->MakeWeak(key.location(), 116 reinterpret_cast<void*>(1234), 117 &WeakPointerCallback); 118 } 119 CHECK(global_handles->IsWeak(key.location())); 120 121 // Force a full GC. 122 // Perform two consecutive GCs because the first one will only clear 123 // weak references whereas the second one will also clear weak maps. 124 heap->CollectAllGarbage(false); 125 CHECK_EQ(1, NumberOfWeakCalls); 126 CHECK_EQ(1, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); 127 CHECK_EQ( 128 0, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); 129 heap->CollectAllGarbage(false); 130 CHECK_EQ(1, NumberOfWeakCalls); 131 CHECK_EQ(0, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); 132 CHECK_EQ( 133 1, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); 134 } 135 136 137 TEST(Shrinking) { 138 LocalContext context; 139 Isolate* isolate = GetIsolateFrom(&context); 140 Factory* factory = isolate->factory(); 141 Heap* heap = isolate->heap(); 142 HandleScope scope(isolate); 143 Handle<JSWeakMap> weakmap = AllocateJSWeakMap(isolate); 144 145 // Check initial capacity. 146 CHECK_EQ(32, ObjectHashTable::cast(weakmap->table())->Capacity()); 147 148 // Fill up weak map to trigger capacity change. 149 { 150 HandleScope scope(isolate); 151 Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); 152 for (int i = 0; i < 32; i++) { 153 Handle<JSObject> object = factory->NewJSObjectFromMap(map); 154 PutIntoWeakMap(weakmap, object, Handle<Smi>(Smi::FromInt(i), isolate)); 155 } 156 } 157 158 // Check increased capacity. 159 CHECK_EQ(128, ObjectHashTable::cast(weakmap->table())->Capacity()); 160 161 // Force a full GC. 162 CHECK_EQ(32, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); 163 CHECK_EQ( 164 0, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); 165 heap->CollectAllGarbage(false); 166 CHECK_EQ(0, ObjectHashTable::cast(weakmap->table())->NumberOfElements()); 167 CHECK_EQ( 168 32, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements()); 169 170 // Check shrunk capacity. 171 CHECK_EQ(32, ObjectHashTable::cast(weakmap->table())->Capacity()); 172 } 173 174 175 // Test that weak map values on an evacuation candidate which are not reachable 176 // by other paths are correctly recorded in the slots buffer. 177 TEST(Regress2060a) { 178 FLAG_always_compact = true; 179 LocalContext context; 180 Isolate* isolate = GetIsolateFrom(&context); 181 Factory* factory = isolate->factory(); 182 Heap* heap = isolate->heap(); 183 HandleScope scope(isolate); 184 Handle<JSFunction> function = 185 factory->NewFunction(factory->function_string(), factory->null_value()); 186 Handle<JSObject> key = factory->NewJSObject(function); 187 Handle<JSWeakMap> weakmap = AllocateJSWeakMap(isolate); 188 189 // Start second old-space page so that values land on evacuation candidate. 190 Page* first_page = heap->old_pointer_space()->anchor()->next_page(); 191 factory->NewFixedArray(900 * KB / kPointerSize, TENURED); 192 193 // Fill up weak map with values on an evacuation candidate. 194 { 195 HandleScope scope(isolate); 196 for (int i = 0; i < 32; i++) { 197 Handle<JSObject> object = factory->NewJSObject(function, TENURED); 198 CHECK(!heap->InNewSpace(object->address())); 199 CHECK(!first_page->Contains(object->address())); 200 PutIntoWeakMap(weakmap, key, object); 201 } 202 } 203 204 // Force compacting garbage collection. 205 CHECK(FLAG_always_compact); 206 heap->CollectAllGarbage(Heap::kNoGCFlags); 207 } 208 209 210 // Test that weak map keys on an evacuation candidate which are reachable by 211 // other strong paths are correctly recorded in the slots buffer. 212 TEST(Regress2060b) { 213 FLAG_always_compact = true; 214 #ifdef VERIFY_HEAP 215 FLAG_verify_heap = true; 216 #endif 217 218 LocalContext context; 219 Isolate* isolate = GetIsolateFrom(&context); 220 Factory* factory = isolate->factory(); 221 Heap* heap = isolate->heap(); 222 HandleScope scope(isolate); 223 Handle<JSFunction> function = 224 factory->NewFunction(factory->function_string(), factory->null_value()); 225 226 // Start second old-space page so that keys land on evacuation candidate. 227 Page* first_page = heap->old_pointer_space()->anchor()->next_page(); 228 factory->NewFixedArray(900 * KB / kPointerSize, TENURED); 229 230 // Fill up weak map with keys on an evacuation candidate. 231 Handle<JSObject> keys[32]; 232 for (int i = 0; i < 32; i++) { 233 keys[i] = factory->NewJSObject(function, TENURED); 234 CHECK(!heap->InNewSpace(keys[i]->address())); 235 CHECK(!first_page->Contains(keys[i]->address())); 236 } 237 Handle<JSWeakMap> weakmap = AllocateJSWeakMap(isolate); 238 for (int i = 0; i < 32; i++) { 239 PutIntoWeakMap(weakmap, 240 keys[i], 241 Handle<Smi>(Smi::FromInt(i), isolate)); 242 } 243 244 // Force compacting garbage collection. The subsequent collections are used 245 // to verify that key references were actually updated. 246 CHECK(FLAG_always_compact); 247 heap->CollectAllGarbage(Heap::kNoGCFlags); 248 heap->CollectAllGarbage(Heap::kNoGCFlags); 249 heap->CollectAllGarbage(Heap::kNoGCFlags); 250 } 251
