1 // Copyright 2011 the V8 project authors. All rights reserved.
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3 // modification, are permitted provided that the following conditions are
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5 //
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15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28 #include "src/v8.h"
29 #include "test/cctest/cctest.h"
30
31 #include "src/api.h"
32 #include "src/debug/debug.h"
33 #include "src/execution.h"
34 #include "src/factory.h"
35 #include "src/global-handles.h"
36 #include "src/macro-assembler.h"
37 #include "src/objects.h"
38 #include "test/cctest/heap/utils-inl.h"
39
40 using namespace v8::internal;
41
42 namespace {
43
44
45 template<typename HashMap>
TestHashMap(Handle<HashMap> table)46 static void TestHashMap(Handle<HashMap> table) {
47 Isolate* isolate = CcTest::i_isolate();
48 Factory* factory = isolate->factory();
49
50 Handle<JSObject> a = factory->NewJSArray(7);
51 Handle<JSObject> b = factory->NewJSArray(11);
52 table = HashMap::Put(table, a, b);
53 CHECK_EQ(table->NumberOfElements(), 1);
54 CHECK_EQ(table->Lookup(a), *b);
55 // When the key does not exist in the map, Lookup returns the hole.
56 CHECK_EQ(table->Lookup(b), CcTest::heap()->the_hole_value());
57
58 // Keys still have to be valid after objects were moved.
59 CcTest::heap()->CollectGarbage(NEW_SPACE);
60 CHECK_EQ(table->NumberOfElements(), 1);
61 CHECK_EQ(table->Lookup(a), *b);
62 CHECK_EQ(table->Lookup(b), CcTest::heap()->the_hole_value());
63
64 // Keys that are overwritten should not change number of elements.
65 table = HashMap::Put(table, a, factory->NewJSArray(13));
66 CHECK_EQ(table->NumberOfElements(), 1);
67 CHECK_NE(table->Lookup(a), *b);
68
69 // Keys that have been removed are mapped to the hole.
70 bool was_present = false;
71 table = HashMap::Remove(table, a, &was_present);
72 CHECK(was_present);
73 CHECK_EQ(table->NumberOfElements(), 0);
74 CHECK_EQ(table->Lookup(a), CcTest::heap()->the_hole_value());
75
76 // Keys should map back to their respective values and also should get
77 // an identity hash code generated.
78 for (int i = 0; i < 100; i++) {
79 Handle<JSReceiver> key = factory->NewJSArray(7);
80 Handle<JSObject> value = factory->NewJSArray(11);
81 table = HashMap::Put(table, key, value);
82 CHECK_EQ(table->NumberOfElements(), i + 1);
83 CHECK_NE(table->FindEntry(key), HashMap::kNotFound);
84 CHECK_EQ(table->Lookup(key), *value);
85 CHECK(key->GetIdentityHash()->IsSmi());
86 }
87
88 // Keys never added to the map which already have an identity hash
89 // code should not be found.
90 for (int i = 0; i < 100; i++) {
91 Handle<JSReceiver> key = factory->NewJSArray(7);
92 CHECK(JSReceiver::GetOrCreateIdentityHash(key)->IsSmi());
93 CHECK_EQ(table->FindEntry(key), HashMap::kNotFound);
94 CHECK_EQ(table->Lookup(key), CcTest::heap()->the_hole_value());
95 CHECK(key->GetIdentityHash()->IsSmi());
96 }
97
98 // Keys that don't have an identity hash should not be found and also
99 // should not get an identity hash code generated.
100 for (int i = 0; i < 100; i++) {
101 Handle<JSReceiver> key = factory->NewJSArray(7);
102 CHECK_EQ(table->Lookup(key), CcTest::heap()->the_hole_value());
103 Object* identity_hash = key->GetIdentityHash();
104 CHECK_EQ(identity_hash, CcTest::heap()->undefined_value());
105 }
106 }
107
108
TEST(HashMap)109 TEST(HashMap) {
110 LocalContext context;
111 v8::HandleScope scope(context->GetIsolate());
112 Isolate* isolate = CcTest::i_isolate();
113 TestHashMap(ObjectHashTable::New(isolate, 23));
114 }
115
116
117 class ObjectHashTableTest: public ObjectHashTable {
118 public:
insert(int entry,int key,int value)119 void insert(int entry, int key, int value) {
120 set(EntryToIndex(entry), Smi::FromInt(key));
121 set(EntryToIndex(entry) + 1, Smi::FromInt(value));
122 }
123
lookup(int key)124 int lookup(int key) {
125 Handle<Object> key_obj(Smi::FromInt(key), GetIsolate());
126 return Smi::cast(Lookup(key_obj))->value();
127 }
128
capacity()129 int capacity() {
130 return Capacity();
131 }
132 };
133
134
TEST(HashTableRehash)135 TEST(HashTableRehash) {
136 LocalContext context;
137 Isolate* isolate = CcTest::i_isolate();
138 v8::HandleScope scope(context->GetIsolate());
139 // Test almost filled table.
140 {
141 Handle<ObjectHashTable> table = ObjectHashTable::New(isolate, 100);
142 ObjectHashTableTest* t = reinterpret_cast<ObjectHashTableTest*>(*table);
143 int capacity = t->capacity();
144 for (int i = 0; i < capacity - 1; i++) {
145 t->insert(i, i * i, i);
146 }
147 t->Rehash(handle(Smi::FromInt(0), isolate));
148 for (int i = 0; i < capacity - 1; i++) {
149 CHECK_EQ(i, t->lookup(i * i));
150 }
151 }
152 // Test half-filled table.
153 {
154 Handle<ObjectHashTable> table = ObjectHashTable::New(isolate, 100);
155 ObjectHashTableTest* t = reinterpret_cast<ObjectHashTableTest*>(*table);
156 int capacity = t->capacity();
157 for (int i = 0; i < capacity / 2; i++) {
158 t->insert(i, i * i, i);
159 }
160 t->Rehash(handle(Smi::FromInt(0), isolate));
161 for (int i = 0; i < capacity / 2; i++) {
162 CHECK_EQ(i, t->lookup(i * i));
163 }
164 }
165 }
166
167
168 #ifdef DEBUG
169 template<class HashSet>
TestHashSetCausesGC(Handle<HashSet> table)170 static void TestHashSetCausesGC(Handle<HashSet> table) {
171 Isolate* isolate = CcTest::i_isolate();
172 Factory* factory = isolate->factory();
173
174 Handle<JSObject> key = factory->NewJSArray(0);
175
176 // Simulate a full heap so that generating an identity hash code
177 // in subsequent calls will request GC.
178 SimulateFullSpace(CcTest::heap()->new_space());
179 SimulateFullSpace(CcTest::heap()->old_space());
180
181 // Calling Contains() should not cause GC ever.
182 int gc_count = isolate->heap()->gc_count();
183 CHECK(!table->Contains(key));
184 CHECK(gc_count == isolate->heap()->gc_count());
185
186 // Calling Remove() will not cause GC in this case.
187 bool was_present = false;
188 table = HashSet::Remove(table, key, &was_present);
189 CHECK(!was_present);
190 CHECK(gc_count == isolate->heap()->gc_count());
191
192 // Calling Add() should cause GC.
193 table = HashSet::Add(table, key);
194 CHECK(gc_count < isolate->heap()->gc_count());
195 }
196 #endif
197
198
199 #ifdef DEBUG
200 template<class HashMap>
TestHashMapCausesGC(Handle<HashMap> table)201 static void TestHashMapCausesGC(Handle<HashMap> table) {
202 Isolate* isolate = CcTest::i_isolate();
203 Factory* factory = isolate->factory();
204
205 Handle<JSObject> key = factory->NewJSArray(0);
206
207 // Simulate a full heap so that generating an identity hash code
208 // in subsequent calls will request GC.
209 SimulateFullSpace(CcTest::heap()->new_space());
210 SimulateFullSpace(CcTest::heap()->old_space());
211
212 // Calling Lookup() should not cause GC ever.
213 CHECK(table->Lookup(key)->IsTheHole());
214
215 // Calling Put() should request GC by returning a failure.
216 int gc_count = isolate->heap()->gc_count();
217 HashMap::Put(table, key, key);
218 CHECK(gc_count < isolate->heap()->gc_count());
219 }
220
221
TEST(ObjectHashTableCausesGC)222 TEST(ObjectHashTableCausesGC) {
223 i::FLAG_stress_compaction = false;
224 LocalContext context;
225 v8::HandleScope scope(context->GetIsolate());
226 Isolate* isolate = CcTest::i_isolate();
227 TestHashMapCausesGC(ObjectHashTable::New(isolate, 1));
228 }
229 #endif
230
TEST(SetRequiresCopyOnCapacityChange)231 TEST(SetRequiresCopyOnCapacityChange) {
232 LocalContext context;
233 v8::HandleScope scope(context->GetIsolate());
234 Isolate* isolate = CcTest::i_isolate();
235 Handle<NameDictionary> dict = NameDictionary::New(isolate, 0, TENURED);
236 dict->SetRequiresCopyOnCapacityChange();
237 Handle<Name> key = isolate->factory()->InternalizeString(
238 v8::Utils::OpenHandle(*v8_str("key")));
239 Handle<Object> value = handle(Smi::FromInt(0), isolate);
240 Handle<NameDictionary> new_dict =
241 NameDictionary::Add(dict, key, value, PropertyDetails::Empty());
242 CHECK_NE(*dict, *new_dict);
243 }
244
245 } // namespace
246