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// |jit-test| skip-if: !this.SharedArrayBuffer
// Test cases for subclasses of SharedArrayBuffer.
load(libdir + "asserts.js");
// Basic subclassing.
class MySharedArrayBuffer1 extends SharedArrayBuffer {
constructor(n) { super(n) }
}
let mv1 = new MySharedArrayBuffer1(1024);
assertEq(mv1 instanceof SharedArrayBuffer, true);
assertEq(mv1 instanceof MySharedArrayBuffer1, true);
assertEq(mv1.byteLength, 1024);
// Can construct views on the subclasses and read/write elements.
let mva1 = new Int8Array(mv1);
assertEq(mva1.length, mv1.byteLength);
assertEq(mva1.buffer, mv1);
for ( let i=1 ; i < mva1.length ; i++ )
mva1[i] = i;
for ( let i=1 ; i < mva1.length ; i++ )
assertEq(mva1[i], (i << 24) >> 24);
// Passing modified arguments to superclass to get a different length.
class MySharedArrayBuffer2 extends SharedArrayBuffer {
constructor(n) { super(n-1) }
}
let mv2 = new MySharedArrayBuffer2(10);
assertEq(mv2 instanceof SharedArrayBuffer, true);
assertEq(mv2 instanceof MySharedArrayBuffer2, true);
assertEq(mv2.byteLength, 9);
// Returning a different object altogether.
class MySharedArrayBuffer3 extends SharedArrayBuffer {
constructor(n) {
return new Array(n);
}
}
let mv3 = new MySharedArrayBuffer3(10);
assertEq(mv3 instanceof Array, true);
assertEq(mv3 instanceof MySharedArrayBuffer3, false);
assertEq(mv3.length, 10);
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