custom-proto-if-object-is-used-sab.js (1630B)
1 // |reftest| skip-if(!this.hasOwnProperty('SharedArrayBuffer')) -- SharedArrayBuffer is not enabled unconditionally 2 // Copyright (C) 2016 the V8 project authors. All rights reserved. 3 // Copyright (C) 2017 Mozilla Corporation. All rights reserved. 4 // This code is governed by the BSD license found in the LICENSE file. 5 6 /*--- 7 esid: sec-dataview-buffer-byteoffset-bytelength 8 description: > 9 Use newTarget's custom constructor prototype if Object 10 info: | 11 24.2.2.1 DataView (buffer, byteOffset, byteLength ) 12 13 ... 14 12. Let O be ? OrdinaryCreateFromConstructor(NewTarget, "%DataViewPrototype%", 15 « [[DataView]], [[ViewedArrayBuffer]], [[ByteLength]], [[ByteOffset]] »). 16 ... 17 17. Return O. 18 19 9.1.13 OrdinaryCreateFromConstructor ( constructor, intrinsicDefaultProto [ , 20 internalSlotsList ] ) 21 22 ... 23 2. Let proto be ? GetPrototypeFromConstructor(constructor, 24 intrinsicDefaultProto). 25 3. Return ObjectCreate(proto, internalSlotsList). 26 27 9.1.15 GetPrototypeFromConstructor ( constructor, intrinsicDefaultProto ) 28 29 ... 30 3. Let proto be ? Get(constructor, "prototype"). 31 4. If Type(proto) is not Object, then 32 a. Let realm be ? GetFunctionRealm(constructor). 33 b. Let proto be realm's intrinsic object named intrinsicDefaultProto. 34 5. Return proto. 35 ... 36 features: [Reflect.construct, SharedArrayBuffer] 37 ---*/ 38 39 var buffer = new SharedArrayBuffer(8); 40 41 function newTarget() {} 42 var proto = {}; 43 newTarget.prototype = proto; 44 45 var sample = Reflect.construct(DataView, [buffer, 0], newTarget); 46 47 assert.sameValue(sample.constructor, Object); 48 assert.sameValue(Object.getPrototypeOf(sample), proto); 49 50 reportCompare(0, 0);