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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This is intended for permanent JS behavior changes for mocking out
// non-deterministic behavior. For temporary suppressions, please refer to
// v8_suppressions.js.
// This mocks only architecture specific differences. Refer to v8_mocks.js
// for the general case.
// This file is loaded before each correctness test cases and won't get
// minimized.
// Mock maximum typed-array buffer and limit to 1MiB. Otherwise we might
// get range errors. We ignore those by crashing, but that reduces coverage,
// hence, let's reduce the range-error rate.
(function() {
// Math.min might be manipulated in test cases.
const min = Math.min;
const maxBytes = 1048576;
const mock = function(type) {
const maxLength = maxBytes / (type.BYTES_PER_ELEMENT || 1);
const handler = {
construct: function(target, args) {
if (args[0] && typeof args[0] != "object") {
// Length used as first argument.
args[0] = min(maxLength, Number(args[0]));
} else if (args[0] instanceof ArrayBuffer && args.length > 1) {
// Buffer used as first argument.
const buffer = args[0];
args[1] = Number(args[1]);
// Ensure offset is multiple of bytes per element.
args[1] = args[1] - (args[1] % type.BYTES_PER_ELEMENT);
// Limit offset to length of buffer.
args[1] = min(args[1], buffer.byteLength || 0);
if (args.length > 2) {
// If also length is given, limit it to the maximum that's possible
// given buffer and offset.
const maxBytesLeft = buffer.byteLength - args[1];
const maxLengthLeft = maxBytesLeft / type.BYTES_PER_ELEMENT;
args[2] = min(Number(args[2]), maxLengthLeft);
}
}
return new (Function.prototype.bind.apply(type, [null].concat(args)));
},
};
return new Proxy(type, handler);
}
ArrayBuffer = mock(ArrayBuffer);
SharedArrayBuffer = mock(SharedArrayBuffer);
Int8Array = mock(Int8Array);
Uint8Array = mock(Uint8Array);
Uint8ClampedArray = mock(Uint8ClampedArray);
Int16Array = mock(Int16Array);
Uint16Array = mock(Uint16Array);
Int32Array = mock(Int32Array);
Uint32Array = mock(Uint32Array);
BigInt64Array = mock(BigInt64Array);
BigUint64Array = mock(BigUint64Array);
Float32Array = mock(Float32Array);
Float64Array = mock(Float64Array);
})();
// Mock typed array set function and cap offset to not throw a range error.
(function() {
// Math.min might be manipulated in test cases.
const min = Math.min;
const types = [
Int8Array,
Uint8Array,
Uint8ClampedArray,
Int16Array,
Uint16Array,
Int32Array,
Uint32Array,
BigInt64Array,
BigUint64Array,
Float32Array,
Float64Array,
];
for (const type of types) {
const set = type.prototype.set;
type.prototype.set = function(array, offset) {
if (Array.isArray(array)) {
offset = Number(offset);
offset = min(offset, this.length - array.length);
}
set.call(this, array, offset);
};
}
})();
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