| // Copyright (C) 2016 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-dataview.prototype.setfloat64 |
| description: > |
| Set value as undefined (cast to NaN) when value argument is not present |
| info: | |
| 24.2.4.14 DataView.prototype.setFloat64 ( byteOffset, value [ , littleEndian ] ) |
| |
| 1. Let v be the this value. |
| 2. If littleEndian is not present, let littleEndian be false. |
| 3. Return ? SetViewValue(v, byteOffset, littleEndian, "Float64", value). |
| |
| 24.2.1.2 SetViewValue ( view, requestIndex, isLittleEndian, type, value ) |
| |
| ... |
| 15. Let bufferIndex be getIndex + viewOffset. |
| 16. Return SetValueInBuffer(buffer, bufferIndex, type, numberValue, isLittleEndian). |
| |
| 24.1.1.6 SetValueInBuffer ( arrayBuffer, byteIndex, type, value [ , isLittleEndian ] ) |
| |
| ... |
| 9. Else if type is "Float64", then |
| a. Set rawBytes to a List containing the 8 bytes that are the IEEE 754-2008 |
| binary64 format encoding of value. If isLittleEndian is false, the bytes are |
| arranged in big endian order. Otherwise, the bytes are arranged in little |
| endian order. If value is NaN, rawValue may be set to any implementation |
| chosen IEEE 754-2008 binary64 format Not-a-Number encoding. An |
| implementation must always choose the same encoding for each implementation |
| distinguishable NaN value. |
| ... |
| 11. Store the individual bytes of rawBytes into block, in order, starting at |
| block[byteIndex]. |
| 12. Return NormalCompletion(undefined). |
| features: [DataView.prototype.getFloat64] |
| ---*/ |
| |
| var buffer = new ArrayBuffer(8); |
| var sample = new DataView(buffer, 0); |
| |
| var result = sample.setFloat64(0); |
| |
| assert.sameValue(sample.getFloat64(0), NaN); |
| assert.sameValue(result, undefined); |