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Diffstat (limited to 'js/src/tests/test262/built-ins/ArrayBuffer/prototype/transfer/from-resizable-to-smaller.js')
-rw-r--r-- | js/src/tests/test262/built-ins/ArrayBuffer/prototype/transfer/from-resizable-to-smaller.js | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/ArrayBuffer/prototype/transfer/from-resizable-to-smaller.js b/js/src/tests/test262/built-ins/ArrayBuffer/prototype/transfer/from-resizable-to-smaller.js new file mode 100644 index 0000000000..14a6259778 --- /dev/null +++ b/js/src/tests/test262/built-ins/ArrayBuffer/prototype/transfer/from-resizable-to-smaller.js @@ -0,0 +1,56 @@ +// |reftest| shell-option(--enable-arraybuffer-resizable) skip-if(!ArrayBuffer.prototype.resize||!xulRuntime.shell) -- resizable-arraybuffer is not enabled unconditionally, requires shell-options +// Copyright (C) 2021 the V8 project authors. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. +/*--- +esid: sec-arraybuffer.prototype.transfer +description: Transfering from a resizable ArrayBuffer into a smaller ArrayBuffer +info: | + ArrayBuffer.prototype.transfer ( [ newLength ] ) + + 1. Let O be the this value. + 2. Perform ? RequireInternalSlot(O, [[ArrayBufferData]]). + 3. If IsSharedArrayBuffer(O) is true, throw a TypeError exception. + 4. If IsDetachedBuffer(O) is true, throw a TypeError exception. + 5. If newLength is undefined, let newByteLength be + O.[[ArrayBufferByteLength]]. + 6. Else, let newByteLength be ? ToIntegerOrInfinity(newLength). + 7. Let new be ? Construct(%ArrayBuffer%, « 𝔽(newByteLength) »). + 8. NOTE: This method returns a fixed-length ArrayBuffer. + 9. Let copyLength be min(newByteLength, O.[[ArrayBufferByteLength]]). + 10. Let fromBlock be O.[[ArrayBufferData]]. + 11. Let toBlock be new.[[ArrayBufferData]]. + 12. Perform CopyDataBlockBytes(toBlock, 0, fromBlock, 0, copyLength). + 13. NOTE: Neither creation of the new Data Block nor copying from the old + Data Block are observable. Implementations reserve the right to implement + this method as a zero-copy move or a realloc. + 14. Perform ! DetachArrayBuffer(O). + 15. Return new. +features: [resizable-arraybuffer, arraybuffer-transfer] +---*/ + +var source = new ArrayBuffer(4, { maxByteLength: 8 }); + +var sourceArray = new Uint8Array(source); +sourceArray[0] = 1; +sourceArray[1] = 2; +sourceArray[2] = 3; +sourceArray[3] = 4; + +var dest = source.transfer(3); + +assert.sameValue(source.byteLength, 0, 'source.byteLength'); +assert.throws(TypeError, function() { + source.slice(); +}); + +assert.sameValue(dest.resizable, true, 'dest.resizable'); +assert.sameValue(dest.byteLength, 3, 'dest.byteLength'); +assert.sameValue(dest.maxByteLength, 8, 'dest.maxByteLength'); + +var destArray = new Uint8Array(dest); + +assert.sameValue(destArray[0], 1, 'destArray[0]'); +assert.sameValue(destArray[1], 2, 'destArray[1]'); +assert.sameValue(destArray[2], 3, 'destArray[2]'); + +reportCompare(0, 0); |