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Editorial: simplify CloneArrayBuffer AO #85

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25 changes: 24 additions & 1 deletion spec.html
Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,29 @@ <h1>
</emu-note>
</emu-clause>

<emu-clause id="sec-clonearraybuffer" type="abstract operation">
<h1>
CloneArrayBuffer (
_srcBuffer_: an ArrayBuffer or a SharedArrayBuffer,
_srcByteOffset_: a non-negative integer,
_srcLength_: a non-negative integer,
<del>_cloneConstructor_: a constructor,</del>
)
</h1>
<dl class="header">
<dt>description</dt>
<dd>It creates a new ArrayBuffer whose data is a copy of _srcBuffer_'s data over the range starting at _srcByteOffset_ and continuing for _srcLength_ bytes.</dd>
</dl>
<emu-alg>
1. Let _targetBuffer_ be ? AllocateArrayBuffer(<del>_cloneConstructor_</del><ins>%ArrayBuffer%</ins>, _srcLength_).
1. If IsDetachedBuffer(_srcBuffer_) is *true*, throw a *TypeError* exception.
1. Let _srcBlock_ be _srcBuffer_.[[ArrayBufferData]].
1. Let _targetBlock_ be _targetBuffer_.[[ArrayBufferData]].
1. Perform CopyDataBlockBytes(_targetBlock_, 0, _srcBlock_, _srcByteOffset_, _srcLength_).
1. Return _targetBuffer_.
</emu-alg>
</emu-clause>

<emu-clause id="sec-allocatearraybuffer" type="abstract operation">
<h1>
AllocateArrayBuffer (
Expand Down Expand Up @@ -929,7 +952,7 @@ <h1>
1. Else, let _same_ be SameValue(_srcBuffer_, _targetBuffer_).
1. If _same_ is *true*, then
1. Let _srcByteLength_ be <del>_source_.[[ByteLength]]</del><ins>IntegerIndexedObjectByteLength(_source_, _getSrcBufferByteLength_)</ins>.
1. Set _srcBuffer_ to ? CloneArrayBuffer(_srcBuffer_, _srcByteOffset_, _srcByteLength_, %ArrayBuffer%).
1. Set _srcBuffer_ to ? CloneArrayBuffer(_srcBuffer_, _srcByteOffset_, _srcByteLength_<del>, %ArrayBuffer%</del>).
1. NOTE: %ArrayBuffer% is used to clone _srcBuffer_ because is it known to not have any observable side-effects.
1. Let _srcByteIndex_ be 0.
1. Else, let _srcByteIndex_ be _srcByteOffset_.
Expand Down