| // Copyright (C) 2021 Microsoft. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| esid: sec-%typedarray%.prototype.findlastindex |
| description: Return abrupt when "this" value fails buffer boundary checks |
| includes: [testTypedArray.js] |
| features: [TypedArray, resizable-arraybuffer, array-find-from-last] |
| ---*/ |
| |
| assert.sameValue( |
| typeof TypedArray.prototype.findLastIndex, |
| 'function', |
| 'implements TypedArray.prototype.findLastIndex' |
| ); |
| |
| assert.sameValue( |
| typeof ArrayBuffer.prototype.resize, |
| 'function', |
| 'implements ArrayBuffer.prototype.resize' |
| ); |
| |
| testWithTypedArrayConstructors(TA => { |
| var BPE = TA.BYTES_PER_ELEMENT; |
| var ab = new ArrayBuffer(BPE * 4, {maxByteLength: BPE * 5}); |
| var array = new TA(ab, BPE, 2); |
| |
| try { |
| ab.resize(BPE * 5); |
| } catch (_) {} |
| |
| // no error following grow: |
| array.findLastIndex(() => {}); |
| |
| try { |
| ab.resize(BPE * 3); |
| } catch (_) {} |
| |
| // no error following shrink (within bounds): |
| array.findLastIndex(() => {}); |
| |
| var expectedError; |
| try { |
| ab.resize(BPE * 2); |
| // If the preceding "resize" operation is successful, the typed array will |
| // be out out of bounds, so the subsequent prototype method should produce |
| // a TypeError due to the semantics of ValidateTypedArray. |
| expectedError = TypeError; |
| } catch (_) { |
| // The host is permitted to fail any "resize" operation at its own |
| // discretion. If that occurs, the findLastIndex operation should complete |
| // successfully. |
| expectedError = Test262Error; |
| } |
| |
| assert.throws(expectedError, () => { |
| array.findLastIndex(() => {}); |
| throw new Test262Error('findLastIndex completed successfully'); |
| }); |
| }); |