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.
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.
28 // Flags: --expose-gc --allow-natives-syntax --harmony-tostring
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)", "Symbol()"].indexOf(s) >= 0;
42 // Test different forms of constructor calls.
44 function indirectSymbol() { return Symbol() }
45 function indirect() { return indirectSymbol() }
46 for (var i = 0; i < 2; ++i) {
47 for (var j = 0; j < 5; ++j) {
48 symbols.push(Symbol())
49 symbols.push(Symbol(undefined))
50 symbols.push(Symbol("66"))
51 symbols.push(Symbol(66))
52 symbols.push(Symbol().valueOf())
53 symbols.push(indirect())
55 %OptimizeFunctionOnNextCall(indirect)
56 indirect() // Call once before GC throws away type feedback.
57 gc() // Promote existing symbols and then allocate some more.
59 assertThrows(function () { Symbol(Symbol()) }, TypeError)
60 assertThrows(function () { new Symbol(66) }, TypeError)
66 for (var i in symbols) {
67 assertEquals("symbol", typeof symbols[i])
68 assertTrue(typeof symbols[i] === "symbol")
69 assertFalse(%SymbolIsPrivate(symbols[i]))
70 assertEquals(null, %_ClassOf(symbols[i]))
71 assertEquals("Symbol", %_ClassOf(Object(symbols[i])))
77 function TestPrototype() {
78 assertSame(Object.prototype, Symbol.prototype.__proto__)
79 assertSame(Symbol.prototype, Symbol().__proto__)
80 assertSame(Symbol.prototype, Object(Symbol()).__proto__)
81 for (var i in symbols) {
82 assertSame(Symbol.prototype, symbols[i].__proto__)
88 function TestConstructor() {
89 assertSame(Function.prototype, Symbol.__proto__)
90 assertFalse(Object === Symbol.prototype.constructor)
91 assertFalse(Symbol === Object.prototype.constructor)
92 assertSame(Symbol, Symbol.prototype.constructor)
93 assertSame(Symbol, Symbol().__proto__.constructor)
94 assertSame(Symbol, Object(Symbol()).__proto__.constructor)
95 for (var i in symbols) {
96 assertSame(Symbol, symbols[i].__proto__.constructor)
102 function TestValueOf() {
103 for (var i in symbols) {
104 assertTrue(symbols[i] === Object(symbols[i]).valueOf())
105 assertTrue(symbols[i] === symbols[i].valueOf())
106 assertTrue(Symbol.prototype.valueOf.call(Object(symbols[i])) === symbols[i])
107 assertTrue(Symbol.prototype.valueOf.call(symbols[i]) === symbols[i])
113 function TestToString() {
114 for (var i in symbols) {
115 assertThrows(function() { new String(symbols[i]) }, TypeError)
116 assertEquals(symbols[i].toString(), String(symbols[i]))
117 assertThrows(function() { symbols[i] + "" }, TypeError)
118 assertThrows(function() { String(Object(symbols[i])) }, TypeError)
119 assertTrue(isValidSymbolString(symbols[i].toString()))
120 assertTrue(isValidSymbolString(Object(symbols[i]).toString()))
122 isValidSymbolString(Symbol.prototype.toString.call(symbols[i])))
124 "[object Symbol]", Object.prototype.toString.call(symbols[i]))
130 function TestToBoolean() {
131 for (var i in symbols) {
132 assertTrue(Boolean(Object(symbols[i])))
133 assertFalse(!Object(symbols[i]))
134 assertTrue(Boolean(symbols[i]).valueOf())
135 assertFalse(!symbols[i])
136 assertTrue(!!symbols[i])
137 assertTrue(symbols[i] && true)
138 assertFalse(!symbols[i] && false)
139 assertTrue(!symbols[i] || true)
140 assertEquals(1, symbols[i] ? 1 : 2)
141 assertEquals(2, !symbols[i] ? 1 : 2)
142 if (!symbols[i]) assertUnreachable();
143 if (symbols[i]) {} else assertUnreachable();
149 function TestToNumber() {
150 for (var i in symbols) {
151 assertThrows(function() { Number(Object(symbols[i])) }, TypeError)
152 assertThrows(function() { +Object(symbols[i]) }, TypeError)
153 assertThrows(function() { Number(symbols[i]) }, TypeError)
154 assertThrows(function() { symbols[i] + 0 }, TypeError)
160 function TestEquality() {
161 // Every symbol should equal itself, and non-strictly equal its wrapper.
162 for (var i in symbols) {
163 assertSame(symbols[i], symbols[i])
164 assertEquals(symbols[i], symbols[i])
165 assertTrue(Object.is(symbols[i], symbols[i]))
166 assertTrue(symbols[i] === symbols[i])
167 assertTrue(symbols[i] == symbols[i])
168 assertFalse(symbols[i] === Object(symbols[i]))
169 assertFalse(Object(symbols[i]) === symbols[i])
170 assertFalse(symbols[i] == Object(symbols[i]))
171 assertFalse(Object(symbols[i]) == symbols[i])
172 assertTrue(symbols[i] === symbols[i].valueOf())
173 assertTrue(symbols[i].valueOf() === symbols[i])
174 assertTrue(symbols[i] == symbols[i].valueOf())
175 assertTrue(symbols[i].valueOf() == symbols[i])
176 assertFalse(Object(symbols[i]) === Object(symbols[i]))
177 assertEquals(Object(symbols[i]).valueOf(), Object(symbols[i]).valueOf())
180 // All symbols should be distinct.
181 for (var i = 0; i < symbols.length; ++i) {
182 for (var j = i + 1; j < symbols.length; ++j) {
183 assertFalse(Object.is(symbols[i], symbols[j]))
184 assertFalse(symbols[i] === symbols[j])
185 assertFalse(symbols[i] == symbols[j])
189 // Symbols should not be equal to any other value (and the test terminates).
190 var values = [347, 1.275, NaN, "string", null, undefined, {}, function() {}]
191 for (var i in symbols) {
192 for (var j in values) {
193 assertFalse(symbols[i] === values[j])
194 assertFalse(values[j] === symbols[i])
195 assertFalse(symbols[i] == values[j])
196 assertFalse(values[j] == symbols[i])
204 for (var i in symbols) {
205 assertTrue(isValidSymbolString(symbols[i].toString()))
206 assertEquals(symbols[i], symbols[i].valueOf())
207 assertEquals(undefined, symbols[i].a)
208 assertEquals(undefined, symbols[i]["a" + "b"])
209 assertEquals(undefined, symbols[i]["" + "1"])
210 assertEquals(undefined, symbols[i][62])
217 for (var i in symbols) {
218 symbols[i].toString = 0
219 assertTrue(isValidSymbolString(symbols[i].toString()))
220 symbols[i].valueOf = 0
221 assertEquals(symbols[i], symbols[i].valueOf())
223 assertEquals(undefined, symbols[i].a)
224 symbols[i]["a" + "b"] = 0
225 assertEquals(undefined, symbols[i]["a" + "b"])
227 assertEquals(undefined, symbols[i][62])
233 // Test Symbol wrapping/boxing over non-builtins.
234 Symbol.prototype.getThisProto = function () {
235 return Object.getPrototypeOf(this);
237 function TestCall() {
238 for (var i in symbols) {
239 assertTrue(symbols[i].getThisProto() === Symbol.prototype)
245 function TestCollections() {
248 var weakmap = new WeakMap
249 for (var i in symbols) {
251 map.set(symbols[i], i)
252 weakmap.set(symbols[i], i)
254 assertEquals(symbols.length, set.size)
255 assertEquals(symbols.length, map.size)
256 for (var i in symbols) {
257 assertTrue(set.has(symbols[i]))
258 assertTrue(map.has(symbols[i]))
259 assertTrue(weakmap.has(symbols[i]))
260 assertEquals(i, map.get(symbols[i]))
261 assertEquals(i, weakmap.get(symbols[i]))
263 for (var i in symbols) {
264 assertTrue(set.delete(symbols[i]))
265 assertTrue(map.delete(symbols[i]))
266 assertTrue(weakmap.delete(symbols[i]))
268 assertEquals(0, set.size)
269 assertEquals(0, map.size)
275 function TestKeySet(obj) {
276 assertTrue(%HasFastProperties(obj))
277 // Set the even symbols via assignment.
278 for (var i = 0; i < symbols.length; i += 2) {
280 // Object should remain in fast mode until too many properties were added.
281 assertTrue(%HasFastProperties(obj) || i >= 30)
286 function TestKeyDefine(obj) {
287 // Set the odd symbols via defineProperty (as non-enumerable).
288 for (var i = 1; i < symbols.length; i += 2) {
289 Object.defineProperty(obj, symbols[i], {value: i, configurable: true})
294 function TestKeyGet(obj) {
295 var obj2 = Object.create(obj)
296 for (var i in symbols) {
297 assertEquals(i|0, obj[symbols[i]])
298 assertEquals(i|0, obj2[symbols[i]])
303 function TestKeyHas(obj) {
304 for (var i in symbols) {
305 assertTrue(symbols[i] in obj)
306 assertTrue(Object.hasOwnProperty.call(obj, symbols[i]))
311 function TestKeyEnum(obj) {
312 for (var name in obj) {
313 assertEquals("string", typeof name)
318 function TestKeyNames(obj) {
319 assertEquals(0, Object.keys(obj).length)
321 var names = Object.getOwnPropertyNames(obj)
322 for (var i in names) {
323 assertEquals("string", typeof names[i])
328 function TestGetOwnPropertySymbols(obj) {
329 var syms = Object.getOwnPropertySymbols(obj)
330 assertEquals(syms.length, symbols.length)
331 for (var i in syms) {
332 assertEquals("symbol", typeof syms[i])
337 function TestKeyDescriptor(obj) {
338 for (var i in symbols) {
339 var desc = Object.getOwnPropertyDescriptor(obj, symbols[i])
340 assertEquals(i|0, desc.value)
341 assertTrue(desc.configurable)
342 assertEquals(i % 2 == 0, desc.writable)
343 assertEquals(i % 2 == 0, desc.enumerable)
344 assertEquals(i % 2 == 0,
345 Object.prototype.propertyIsEnumerable.call(obj, symbols[i]))
350 function TestKeyDelete(obj) {
351 for (var i in symbols) {
352 delete obj[symbols[i]]
354 for (var i in symbols) {
355 assertEquals(undefined, Object.getOwnPropertyDescriptor(obj, symbols[i]))
360 var objs = [{}, [], Object.create(null), Object(1), new Map, function(){}]
362 for (var i in objs) {
370 TestGetOwnPropertySymbols(obj)
371 TestKeyDescriptor(obj)
376 function TestDefineProperties() {
378 for (var i in symbols) {
379 Object.defineProperty(
380 properties, symbols[i], {value: {value: i}, enumerable: i % 2 === 0})
382 var o = Object.defineProperties({}, properties)
383 for (var i in symbols) {
384 assertEquals(i % 2 === 0, symbols[i] in o)
387 TestDefineProperties()
390 function TestCreate() {
392 for (var i in symbols) {
393 Object.defineProperty(
394 properties, symbols[i], {value: {value: i}, enumerable: i % 2 === 0})
396 var o = Object.create(Object.prototype, properties)
397 for (var i in symbols) {
398 assertEquals(i % 2 === 0, symbols[i] in o)
404 function TestCachedKeyAfterScavenge() {
406 // Keyed property lookup are cached. Hereby we assume that the keys are
407 // tenured, so that we only have to clear the cache between mark compacts,
408 // but not between scavenges. This must also apply for symbol keys.
409 var key = Symbol("key");
413 for (var i = 0; i < 100000; i++) {
414 a[key] += "a"; // Allocations cause a scavenge.
417 TestCachedKeyAfterScavenge();
420 function TestGetOwnPropertySymbolsWithProto() {
421 // We need to be have fast properties to have insertion order for property
422 // keys. The current limit is currently 30 properties.
423 var syms = symbols.slice(0, 30);
425 var object = Object.create(proto)
426 for (var i = 0; i < syms.length; i++) {
427 // Even on object, odd on proto.
435 assertTrue(%HasFastProperties(object));
437 var objectOwnSymbols = Object.getOwnPropertySymbols(object)
438 assertEquals(objectOwnSymbols.length, syms.length / 2)
440 for (var i = 0; i < objectOwnSymbols.length; i++) {
441 assertEquals(objectOwnSymbols[i], syms[i * 2])
444 TestGetOwnPropertySymbolsWithProto()
447 function TestWellKnown() {
449 // TODO(rossberg): reactivate once implemented.
450 // "hasInstance", "isConcatSpreadable", "isRegExp",
451 "iterator", /* "toStringTag", */ "unscopables"
454 for (var i in symbols) {
455 var name = symbols[i]
456 var desc = Object.getOwnPropertyDescriptor(Symbol, name)
457 assertSame("symbol", typeof desc.value)
458 assertSame("Symbol(Symbol." + name + ")", desc.value.toString())
459 assertFalse(desc.writable)
460 assertFalse(desc.configurable)
461 assertFalse(desc.enumerable)
463 assertFalse(Symbol.for("Symbol." + name) === desc.value)
464 assertTrue(Symbol.keyFor(desc.value) === undefined)
470 function TestRegistry() {
471 var symbol1 = Symbol.for("x1")
472 var symbol2 = Symbol.for("x2")
473 assertFalse(symbol1 === symbol2)
475 assertSame(symbol1, Symbol.for("x1"))
476 assertSame(symbol2, Symbol.for("x2"))
477 assertSame("x1", Symbol.keyFor(symbol1))
478 assertSame("x2", Symbol.keyFor(symbol2))
480 assertSame(Symbol.for("1"), Symbol.for(1))
481 assertThrows(function() { Symbol.keyFor("bla") }, TypeError)
482 assertThrows(function() { Symbol.keyFor({}) }, TypeError)
484 var realm = Realm.create()
485 assertFalse(Symbol === Realm.eval(realm, "Symbol"))
486 assertFalse(Symbol.for === Realm.eval(realm, "Symbol.for"))
487 assertFalse(Symbol.keyFor === Realm.eval(realm, "Symbol.keyFor"))
488 assertSame(Symbol.create, Realm.eval(realm, "Symbol.create"))
489 assertSame(Symbol.iterator, Realm.eval(realm, "Symbol.iterator"))
491 assertSame(symbol1, Realm.eval(realm, "Symbol.for")("x1"))
492 assertSame(symbol1, Realm.eval(realm, "Symbol.for('x1')"))
493 assertSame("x1", Realm.eval(realm, "Symbol.keyFor")(symbol1))
494 Realm.shared = symbol1
495 assertSame("x1", Realm.eval(realm, "Symbol.keyFor(Realm.shared)"))
497 var symbol3 = Realm.eval(realm, "Symbol.for('x3')")
498 assertFalse(symbol1 === symbol3)
499 assertFalse(symbol2 === symbol3)
500 assertSame(symbol3, Symbol.for("x3"))
501 assertSame("x3", Symbol.keyFor(symbol3))
506 function TestGetOwnPropertySymbolsOnPrimitives() {
507 assertEquals(Object.getOwnPropertySymbols(true), []);
508 assertEquals(Object.getOwnPropertySymbols(5000), []);
509 assertEquals(Object.getOwnPropertySymbols("OK"), []);
511 TestGetOwnPropertySymbolsOnPrimitives();