species-fuse-typedarray-1.js

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var TypedArrays = [

  Int8Array,

  Uint8Array,

  Uint8ClampedArray,

  Int16Array,

  Uint16Array,

  Int32Array,

  Uint32Array,

  BigInt64Array,

  BigUint64Array,

  Float16Array,

  Float32Array,

  Float64Array,

];

function test() {

  // Mutating %TypedArray%.prototype.constructor pops the fuse. A no-op change is fine.

  newGlobal().evaluate(`

    assertEq(getFuseState().OptimizeTypedArraySpeciesFuse.intact, true);

    const TypedArray = Object.getPrototypeOf(Int8Array);

    let p = TypedArray.prototype.constructor;

    TypedArray.prototype.constructor = p;

    assertEq(getFuseState().OptimizeTypedArraySpeciesFuse.intact, true);

    TypedArray.prototype.constructor = Object;

    assertEq(getFuseState().OptimizeTypedArraySpeciesFuse.intact, false);

`);

  // Mutating %TypedArray%[Symbol.species] pops the fuse.

  newGlobal().evaluate(`

    assertEq(getFuseState().OptimizeTypedArraySpeciesFuse.intact, true);

    const TypedArray = Object.getPrototypeOf(Int8Array);

    delete TypedArray[Symbol.species];

    assertEq(getFuseState().OptimizeTypedArraySpeciesFuse.intact, false);

`);

  // Mutating <TypedArray>.prototype.constructor pops the fuse. A no-op change is fine.

  for (var TA of TypedArrays) {

    newGlobal().evaluate(`

      assertEq(getFuseState().OptimizeTypedArraySpeciesFuse.intact, true);

      let p = ${TA.name}.prototype.constructor;

      ${TA.name}.prototype.constructor = p;

      assertEq(getFuseState().OptimizeTypedArraySpeciesFuse.intact, true);

      ${TA.name}.prototype.constructor = Object;

      assertEq(getFuseState().OptimizeTypedArraySpeciesFuse.intact, false);

`);

  // Mutating the prototype of <TypedArray>.prototype pops the fuse. A no-op change is fine.

  for (var TA of TypedArrays) {

    newGlobal().evaluate(`

      assertEq(getFuseState().OptimizeTypedArraySpeciesFuse.intact, true);

      let p = Object.getPrototypeOf(${TA.name}.prototype);

      Object.setPrototypeOf(${TA.name}.prototype, p);

      assertEq(getFuseState().OptimizeTypedArraySpeciesFuse.intact, true);

      Object.setPrototypeOf(${TA.name}.prototype, Object);

      assertEq(getFuseState().OptimizeTypedArraySpeciesFuse.intact, false);

`);

test();