3f88d2dab4
This adds tests for the mock logic used in differential fuzzing. The tests uncovered a couple of issues in the mock files that are also fixed. This also does some minor code clean up in the mock code. Bug: chromium:1044942 Change-Id: I5b67f70f8b104bb681548f742ab863395a88360f Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2043843 Commit-Queue: Michael Achenbach <machenbach@chromium.org> Reviewed-by: Mathias Bynens <mathias@chromium.org> Cr-Commit-Position: refs/heads/master@{#66304}
157 lines
4.3 KiB
JavaScript
157 lines
4.3 KiB
JavaScript
// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// This is intended for permanent JS behavior changes for mocking out
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// non-deterministic behavior. For temporary suppressions, please refer to
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// v8_suppressions.js.
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// This file is loaded before each correctness test cases and won't get
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// minimized.
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// This will be overridden in the test cases. The override can be minimized.
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var prettyPrinted = function prettyPrinted(msg) { return msg; };
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// Mock Math.random.
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(function() {
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let index = 0
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Math.random = function() {
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index = (index + 1) % 10;
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return index / 10.0;
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}
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})();
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// Mock Date.
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(function() {
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let index = 0;
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let mockDate = 1477662728696;
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const mockDateNow = function() {
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index = (index + 1) % 10;
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mockDate = mockDate + index + 1;
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return mockDate;
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}
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const origDate = Date;
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const constructDate = function(args) {
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let result;
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if (args.length) {
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result = new origDate(...args);
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} else {
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result = new origDate(mockDateNow());
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}
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result.constructor = function(...args) { return constructDate(args); }
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Object.defineProperty(
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result, "constructor", { configurable: false, writable: false });
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return result;
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}
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var handler = {
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apply: function(target, thisArg, args) {
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return constructDate(args);
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},
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construct: function(target, args, newTarget) {
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return constructDate(args);
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},
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get: function(target, property, receiver) {
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if (property == "now") {
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return mockDateNow;
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}
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if (property == "prototype") {
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return origDate.prototype;
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}
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},
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}
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Date = new Proxy(Date, handler);
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})();
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// Mock performance methods.
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performance.now = function() { return 1.2; };
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performance.measureMemory = function() { return []; };
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// Mock readline so that test cases don't hang.
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readline = function() { return "foo"; };
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// Mock stack traces.
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Error.prepareStackTrace = function(error, structuredStackTrace) {
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return "";
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};
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Object.defineProperty(
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Error, 'prepareStackTrace', { configurable: false, writable: false });
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// Mock buffer access in float typed arrays because of varying NaN patterns.
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(function() {
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const origIsNaN = isNaN;
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const deNaNify = function(value) { return origIsNaN(value) ? 1 : value; };
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const mock = function(type) {
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// Remove NaN values from parameters to "set" function.
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const set = type.prototype.set;
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type.prototype.set = function(array, offset) {
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if (Array.isArray(array)) {
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array = array.map(deNaNify);
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}
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set.apply(this, [array, offset]);
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};
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const handler = {
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// Remove NaN values from parameters to constructor.
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construct: function(target, args) {
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for (let i = 0; i < args.length; i++) {
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if (args[i] != null &&
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typeof args[i][Symbol.iterator] === 'function') {
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// Consume iterators.
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args[i] = Array.from(args[i]);
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}
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if (Array.isArray(args[i])) {
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args[i] = args[i].map(deNaNify);
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}
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}
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const obj = new (
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Function.prototype.bind.call(type, null, ...args));
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return new Proxy(obj, {
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get: function(x, prop) {
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if (typeof x[prop] == "function")
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return x[prop].bind(obj);
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return x[prop];
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},
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// Remove NaN values that get assigned.
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set: function(target, prop, value, receiver) {
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target[prop] = deNaNify(value);
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return value;
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}
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});
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},
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};
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return new Proxy(type, handler);
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}
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Float32Array = mock(Float32Array);
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Float64Array = mock(Float64Array);
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})();
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// Mock Worker.
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(function() {
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let index = 0;
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// TODO(machenbach): Randomize this for each test case, but keep stable
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// during comparison. Also data and random above.
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const workerMessages = [
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undefined, 0, -1, "", "foo", 42, [], {}, [0], {"x": 0}
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];
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Worker = function(code){
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try {
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print(prettyPrinted(eval(code)));
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} catch(e) {
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print(prettyPrinted(e));
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}
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this.getMessage = function(){
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index = (index + 1) % 10;
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return workerMessages[index];
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}
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this.postMessage = function(msg){
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print(prettyPrinted(msg));
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}
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};
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})();
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