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// Copyright 2016 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 file is loaded before each correctness test cases and won't get
// minimized.
// This will be overridden in the test cases. The override can be minimized.
var prettyPrinted = function prettyPrinted(msg) { return msg; };
// Mock Math.random.
(function() {
let index = 1;
Math.random = function() {
const x = Math.sin(index++) * 10000;
return x - Math.floor(x);
}
})();
// Mock Math.pow. Work around an optimization for -0.5.
(function() {
const origMathPow = Math.pow;
Math.pow = function(a, b) {
if (b === -0.5) {
return 0;
} else {
return origMathPow(a, b);
}
}
})();
// Mock Date.
(function() {
let index = 0;
let mockDate = 1477662728696;
const mockDateNow = function() {
index = (index + 1) % 10;
mockDate = mockDate + index + 1;
return mockDate;
}
const origDate = Date;
const construct = Reflect.construct;
const constructDate = function(args) {
let result;
if (args.length) {
result = construct(origDate, args);
} else {
result = new origDate(mockDateNow());
}
result.constructor = function(...args) { return constructDate(args); }
Object.defineProperty(
result, "constructor", { configurable: false, writable: false });
return result;
}
origDate.prototype.constructor = function(...args) {
return constructDate(args);
};
var handler = {
apply: function(target, thisArg, args) {
return constructDate(args);
},
construct: function(target, args, newTarget) {
return constructDate(args);
},
get: function(target, property, receiver) {
if (property == "now") {
return mockDateNow;
}
if (property == "prototype") {
return origDate.prototype;
}
},
}
Date = new Proxy(Date, handler);
})();
// Mock performance methods.
performance.now = function() { return 1.2; };
performance.measureMemory = function() { return []; };
// Mock readline so that test cases don't hang.
readline = function() { return "foo"; };
// Mock stack traces.
Error.prepareStackTrace = function(error, structuredStackTrace) {
return "";
};
Object.defineProperty(
Error, 'prepareStackTrace', { configurable: false, writable: false });
// Mock buffer access in float typed arrays because of varying NaN patterns.
(function() {
const origIsNaN = isNaN;
const deNaNify = function(value) { return origIsNaN(value) ? 1 : value; };
const mock = function(type) {
// Remove NaN values from parameters to "set" function.
const set = type.prototype.set;
type.prototype.set = function(array, offset) {
if (Array.isArray(array)) {
array = array.map(deNaNify);
}
set.apply(this, [array, offset]);
};
const handler = {
// Remove NaN values from parameters to constructor.
construct: function(target, args) {
for (let i = 0; i < args.length; i++) {
if (args[i] != null &&
typeof args[i][Symbol.iterator] === 'function') {
// Consume iterators.
args[i] = Array.from(args[i]);
}
if (Array.isArray(args[i])) {
args[i] = args[i].map(deNaNify);
}
}
const obj = new (
Function.prototype.bind.call(type, null, ...args));
return new Proxy(obj, {
get: function(x, prop) {
if (typeof x[prop] == "function")
return x[prop].bind(obj);
return x[prop];
},
// Remove NaN values that get assigned.
set: function(target, prop, value, receiver) {
target[prop] = deNaNify(value);
return value;
}
});
},
};
return new Proxy(type, handler);
}
Float32Array = mock(Float32Array);
Float64Array = mock(Float64Array);
})();
// Mock buffer access via DataViews because of varying NaN patterns.
(function() {
const origIsNaN = isNaN;
const deNaNify = function(value) { return origIsNaN(value) ? 1 : value; };
const origSetFloat32 = DataView.prototype.setFloat32;
DataView.prototype.setFloat32 = function(offset, value, ...rest) {
origSetFloat32.call(this, offset, deNaNify(value), ...rest);
};
const origSetFloat64 = DataView.prototype.setFloat64;
DataView.prototype.setFloat64 = function(offset, value, ...rest) {
origSetFloat64.call(this, offset, deNaNify(value), ...rest);
};
})();
// Mock Worker.
(function() {
let index = 0;
// TODO(machenbach): Randomize this for each test case, but keep stable
// during comparison. Also data and random above.
const workerMessages = [
undefined, 0, -1, "", "foo", 42, [], {}, [0], {"x": 0}
];
Worker = function(code){
try {
print(prettyPrinted(eval(code)));
} catch(e) {
print(prettyPrinted(e));
}
this.getMessage = function(){
index = (index + 1) % 10;
return workerMessages[index];
}
this.postMessage = function(msg){
print(prettyPrinted(msg));
}
};
})();
// Mock Realm.
Realm.eval = function(realm, code) { return eval(code) };
// Mock the nondeterministic parts of WeakRef and FinalizationRegistry.
WeakRef.prototype.deref = function() { };
FinalizationRegistry = function(callback) { };
FinalizationRegistry.prototype.register = function(target, holdings) { };
FinalizationRegistry.prototype.unregister = function(unregisterToken) { };
FinalizationRegistry.prototype.cleanupSome = function() { };
FinalizationRegistry.prototype[Symbol.toStringTag] = "FinalizationRegistry";
// Mock the nondeterministic Atomics.waitAsync.
Atomics.waitAsync = function() {
// Return a mock "Promise" whose "then" function will call the callback
// immediately.
return {'value': {'then': function (f) { f(); }}};
}
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