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Diffstat (limited to '')
-rw-r--r-- | js/src/tests/test262/built-ins/TypedArray/prototype/lastIndexOf/detached-buffer-during-fromIndex-returns-minus-one-for-zero.js | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/TypedArray/prototype/lastIndexOf/detached-buffer-during-fromIndex-returns-minus-one-for-zero.js b/js/src/tests/test262/built-ins/TypedArray/prototype/lastIndexOf/detached-buffer-during-fromIndex-returns-minus-one-for-zero.js new file mode 100644 index 0000000000..6d4460d294 --- /dev/null +++ b/js/src/tests/test262/built-ins/TypedArray/prototype/lastIndexOf/detached-buffer-during-fromIndex-returns-minus-one-for-zero.js @@ -0,0 +1,48 @@ +// Copyright (C) 2020 Rick Waldron. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. +/*--- +esid: sec-%typedarray%.prototype.lastindexof +description: Returns -1 if buffer is detached after ValidateTypedArray +info: | + %TypedArray%.prototype.lastIndexOf ( searchElement [ , fromIndex ] ) + + The interpretation and use of the arguments of %TypedArray%.prototype.lastIndexOf are the same as for Array.prototype.lastIndexOf as defined in 22.1.3.17. + + When the lastIndexOf method is called with one or two arguments, the following steps are taken: + + Let O be the this value. + Perform ? ValidateTypedArray(O). + Let len be O.[[ArrayLength]]. + If len is 0, return -1F. + If fromIndex is present, let n be ? ToIntegerOrInfinity(fromIndex); else let n be len - 1. + If n is -∞, return -1F. + If n ≥ 0, then + Let k be min(n, len - 1). + Else, + Let k be len + n. + Repeat, while k ≥ 0, + Let kPresent be ! HasProperty(O, ! ToString(F(k))). + If kPresent is true, then + Let elementK be ! Get(O, ! ToString(F(k))). + Let same be the result of performing Strict Equality Comparison searchElement === elementK. + If same is true, return F(k). + Set k to k - 1. + Return -1F. + +includes: [testTypedArray.js, detachArrayBuffer.js] +features: [align-detached-buffer-semantics-with-web-reality, TypedArray] +---*/ + +testWithTypedArrayConstructors(function(TA) { + const sample = new TA(1); + const fromIndex = { + valueOf() { + $DETACHBUFFER(sample.buffer); + return 0; + } + }; + + assert.sameValue(sample.lastIndexOf(0, fromIndex), -1); +}); + +reportCompare(0, 0); |