1 // Copyright 2013 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
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.
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13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
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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
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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
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26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 // Flags: --expose-gc --allow-natives-syntax
33 // Returns true if the string is a valid
34 // serialization of Symbols added to the 'symbols'
35 // array. Adjust if you extend 'symbols' with other
37 function isValidSymbolString(s) {
38 return ["Symbol(66)"].indexOf(s) >= 0;
42 // Test different forms of constructor calls, all equivalent.
44 for (var i = 0; i < 2; ++i) {
45 for (var j = 0; j < 5; ++j) {
46 symbols.push(%CreatePrivateSymbol("66"))
47 symbols.push(Object(%CreatePrivateSymbol("66")).valueOf())
49 gc() // Promote existing symbols and then allocate some more.
56 for (var i in symbols) {
57 assertEquals("symbol", typeof symbols[i])
58 assertTrue(typeof symbols[i] === "symbol")
59 assertTrue(%SymbolIsPrivate(symbols[i]))
60 assertEquals(null, %_ClassOf(symbols[i]))
61 assertEquals("Symbol", %_ClassOf(Object(symbols[i])))
67 function TestPrototype() {
68 for (var i in symbols) {
69 assertSame(Symbol.prototype, symbols[i].__proto__)
75 function TestConstructor() {
76 for (var i in symbols) {
77 assertSame(Symbol, symbols[i].__proto__.constructor)
78 assertSame(Symbol, Object(symbols[i]).__proto__.constructor)
84 function TestToString() {
85 for (var i in symbols) {
86 assertThrows(function() {new String(symbols[i]) }, TypeError)
87 assertEquals(symbols[i].toString(), String(symbols[i]))
88 assertThrows(function() { symbols[i] + "" }, TypeError)
89 assertTrue(isValidSymbolString(symbols[i].toString()))
90 assertTrue(isValidSymbolString(Object(symbols[i]).toString()))
91 assertTrue(isValidSymbolString(Symbol.prototype.toString.call(symbols[i])))
93 "[object Symbol]", Object.prototype.toString.call(symbols[i]))
99 function TestToBoolean() {
100 for (var i in symbols) {
101 assertTrue(Boolean(symbols[i]).valueOf())
102 assertFalse(!symbols[i])
103 assertTrue(!!symbols[i])
104 assertTrue(symbols[i] && true)
105 assertFalse(!symbols[i] && false)
106 assertTrue(!symbols[i] || true)
107 assertEquals(1, symbols[i] ? 1 : 2)
108 assertEquals(2, !symbols[i] ? 1 : 2)
109 if (!symbols[i]) assertUnreachable();
110 if (symbols[i]) {} else assertUnreachable();
116 function TestToNumber() {
117 for (var i in symbols) {
118 assertThrows(function() { Number(symbols[i]); }, TypeError);
119 assertThrows(function() { symbols[i] + 0; }, TypeError);
125 function TestEquality() {
126 // Every symbol should equal itself, and non-strictly equal its wrapper.
127 for (var i in symbols) {
128 assertSame(symbols[i], symbols[i])
129 assertEquals(symbols[i], symbols[i])
130 assertTrue(Object.is(symbols[i], symbols[i]))
131 assertTrue(symbols[i] === symbols[i])
132 assertTrue(symbols[i] == symbols[i])
133 assertFalse(symbols[i] === Object(symbols[i]))
134 assertFalse(Object(symbols[i]) === symbols[i])
135 assertFalse(symbols[i] == Object(symbols[i]))
136 assertFalse(Object(symbols[i]) == symbols[i])
137 assertTrue(symbols[i] === symbols[i].valueOf())
138 assertTrue(symbols[i].valueOf() === symbols[i])
139 assertTrue(symbols[i] == symbols[i].valueOf())
140 assertTrue(symbols[i].valueOf() == symbols[i])
143 // All symbols should be distinct.
144 for (var i = 0; i < symbols.length; ++i) {
145 for (var j = i + 1; j < symbols.length; ++j) {
146 assertFalse(Object.is(symbols[i], symbols[j]))
147 assertFalse(symbols[i] === symbols[j])
148 assertFalse(symbols[i] == symbols[j])
152 // Symbols should not be equal to any other value (and the test terminates).
153 var values = [347, 1.275, NaN, "string", null, undefined, {}, function() {}]
154 for (var i in symbols) {
155 for (var j in values) {
156 assertFalse(symbols[i] === values[j])
157 assertFalse(values[j] === symbols[i])
158 assertFalse(symbols[i] == values[j])
159 assertFalse(values[j] == symbols[i])
167 for (var i in symbols) {
168 assertTrue(isValidSymbolString(symbols[i].toString()))
169 assertEquals(symbols[i], symbols[i].valueOf())
170 assertEquals(undefined, symbols[i].a)
171 assertEquals(undefined, symbols[i]["a" + "b"])
172 assertEquals(undefined, symbols[i]["" + "1"])
173 assertEquals(undefined, symbols[i][62])
180 for (var i in symbols) {
181 symbols[i].toString = 0
182 assertTrue(isValidSymbolString(symbols[i].toString()))
183 symbols[i].valueOf = 0
184 assertEquals(symbols[i], symbols[i].valueOf())
186 assertEquals(undefined, symbols[i].a)
187 symbols[i]["a" + "b"] = 0
188 assertEquals(undefined, symbols[i]["a" + "b"])
190 assertEquals(undefined, symbols[i][62])
196 function TestCollections() {
199 var weakmap = new WeakMap
200 for (var i in symbols) {
202 map.set(symbols[i], i)
203 weakmap.set(symbols[i], i)
205 assertEquals(symbols.length, set.size)
206 assertEquals(symbols.length, map.size)
207 for (var i in symbols) {
208 assertTrue(set.has(symbols[i]))
209 assertTrue(map.has(symbols[i]))
210 assertTrue(weakmap.has(symbols[i]))
211 assertEquals(i, map.get(symbols[i]))
212 assertEquals(i, weakmap.get(symbols[i]))
214 for (var i in symbols) {
215 assertTrue(set.delete(symbols[i]))
216 assertTrue(map.delete(symbols[i]))
217 assertTrue(weakmap.delete(symbols[i]))
219 assertEquals(0, set.size)
220 assertEquals(0, map.size)
226 function TestKeySet(obj) {
227 assertTrue(%HasFastProperties(obj))
228 // Set the even symbols via assignment.
229 for (var i = 0; i < symbols.length; i += 2) {
231 // Object should remain in fast mode until too many properties were added.
232 assertTrue(%HasFastProperties(obj) || i >= 30)
237 function TestKeyDefine(obj) {
238 // Set the odd symbols via defineProperty (as non-enumerable).
239 for (var i = 1; i < symbols.length; i += 2) {
240 Object.defineProperty(obj, symbols[i], {value: i, configurable: true})
245 function TestKeyGet(obj) {
246 var obj2 = Object.create(obj)
247 for (var i in symbols) {
248 assertEquals(i|0, obj[symbols[i]])
249 assertEquals(i|0, obj2[symbols[i]])
254 function TestKeyHas() {
255 for (var i in symbols) {
256 assertTrue(symbols[i] in obj)
257 assertTrue(Object.hasOwnProperty.call(obj, symbols[i]))
262 function TestKeyEnum(obj) {
263 for (var name in obj) {
264 assertEquals("string", typeof name)
269 function TestKeyNames(obj) {
270 assertEquals(0, Object.keys(obj).length)
272 var names = Object.getOwnPropertyNames(obj)
273 for (var i in names) {
274 assertEquals("string", typeof names[i])
279 function TestKeyDescriptor(obj) {
280 for (var i in symbols) {
281 var desc = Object.getOwnPropertyDescriptor(obj, symbols[i]);
282 assertEquals(i|0, desc.value)
283 assertTrue(desc.configurable)
284 assertEquals(i % 2 == 0, desc.writable)
285 assertEquals(i % 2 == 0, desc.enumerable)
286 assertEquals(i % 2 == 0,
287 Object.prototype.propertyIsEnumerable.call(obj, symbols[i]))
292 function TestKeyDelete(obj) {
293 for (var i in symbols) {
294 delete obj[symbols[i]]
296 for (var i in symbols) {
297 assertEquals(undefined, Object.getOwnPropertyDescriptor(obj, symbols[i]))
302 var objs = [{}, [], Object.create(null), Object(1), new Map, function(){}]
304 for (var i in objs) {
312 TestKeyDescriptor(obj)
317 function TestCachedKeyAfterScavenge() {
319 // Keyed property lookup are cached. Hereby we assume that the keys are
320 // tenured, so that we only have to clear the cache between mark compacts,
321 // but not between scavenges. This must also apply for symbol keys.
322 var key = Symbol("key");
326 for (var i = 0; i < 100000; i++) {
327 a[key] += "a"; // Allocations cause a scavenge.
330 TestCachedKeyAfterScavenge();
333 function TestGetOwnPropertySymbols() {
334 var privateSymbol = %CreatePrivateSymbol("private")
335 var publicSymbol = Symbol()
336 var publicSymbol2 = Symbol()
338 obj[publicSymbol] = 1
339 obj[privateSymbol] = 2
340 obj[publicSymbol2] = 3
341 var syms = Object.getOwnPropertySymbols(obj)
342 assertEquals(syms, [publicSymbol, publicSymbol2])
344 TestGetOwnPropertySymbols()
347 function TestSealAndFreeze(freeze) {
348 var sym = %CreatePrivateSymbol("private")
353 assertEquals(2, obj[sym])
354 assertTrue(delete obj[sym])
355 assertEquals(undefined, obj[sym])
357 TestSealAndFreeze(Object.seal)
358 TestSealAndFreeze(Object.freeze)
359 TestSealAndFreeze(Object.preventExtensions)