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bootstrap: experimental --frozen-intrinsics flag
PR-URL: #25685 Reviewed-By: Bradley Farias <bradley.meck@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net>
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| Original file line number | Diff line number | Diff line change |
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| // Adapted from SES/Caja - Copyright (C) 2011 Google Inc. | ||
| // Copyright (C) 2018 Agoric | ||
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| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // SPDX-License-Identifier: MIT | ||
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| // based upon: | ||
| // https://github.com/google/caja/blob/master/src/com/google/caja/ses/startSES.js | ||
| // https://github.com/google/caja/blob/master/src/com/google/caja/ses/repairES5.js | ||
| // https://github.com/tc39/proposal-frozen-realms/blob/91ac390e3451da92b5c27e354b39e52b7636a437/shim/src/deep-freeze.js | ||
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| /* global WebAssembly, SharedArrayBuffer, console */ | ||
| 'use strict'; | ||
| module.exports = function() { | ||
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| const intrinsics = [ | ||
| // Anonymous Intrinsics | ||
| // ThrowTypeError | ||
| Object.getOwnPropertyDescriptor(Function.prototype, 'caller').get, | ||
| // IteratorPrototype | ||
| Object.getPrototypeOf( | ||
| Object.getPrototypeOf(new Array()[Symbol.iterator]()) | ||
| ), | ||
| // ArrayIteratorPrototype | ||
| Object.getPrototypeOf(new Array()[Symbol.iterator]()), | ||
| // StringIteratorPrototype | ||
| Object.getPrototypeOf(new String()[Symbol.iterator]()), | ||
| // MapIteratorPrototype | ||
| Object.getPrototypeOf(new Map()[Symbol.iterator]()), | ||
| // SetIteratorPrototype | ||
| Object.getPrototypeOf(new Set()[Symbol.iterator]()), | ||
| // GeneratorFunction | ||
| Object.getPrototypeOf(function* () {}), | ||
| // AsyncFunction | ||
| Object.getPrototypeOf(async function() {}), | ||
| // AsyncGeneratorFunction | ||
| Object.getPrototypeOf(async function* () {}), | ||
| // TypedArray | ||
| Object.getPrototypeOf(Uint8Array), | ||
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| // 18 The Global Object | ||
| eval, | ||
| isFinite, | ||
| isNaN, | ||
| parseFloat, | ||
| parseInt, | ||
| decodeURI, | ||
| decodeURIComponent, | ||
| encodeURI, | ||
| encodeURIComponent, | ||
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| // 19 Fundamental Objects | ||
| Object, // 19.1 | ||
| Function, // 19.2 | ||
| Boolean, // 19.3 | ||
| Symbol, // 19.4 | ||
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| // Disabled pending stack trace mutation handling | ||
| // Error, // 19.5 | ||
| // EvalError, | ||
| // RangeError, | ||
| // ReferenceError, | ||
| // SyntaxError, | ||
| // TypeError, | ||
| // URIError, | ||
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| // 20 Numbers and Dates | ||
| Number, // 20.1 | ||
| Math, // 20.2 | ||
| Date, // 20.3 | ||
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| // 21 Text Processing | ||
| String, // 21.1 | ||
| RegExp, // 21.2 | ||
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| // 22 Indexed Collections | ||
| Array, // 22.1 | ||
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| Int8Array, | ||
| Uint8Array, | ||
| Uint8ClampedArray, | ||
| Int16Array, | ||
| Uint16Array, | ||
| Int32Array, | ||
| Uint32Array, | ||
| Float32Array, | ||
| Float64Array, | ||
| BigInt64Array, | ||
| BigUint64Array, | ||
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| // 23 Keyed Collections | ||
| Map, // 23.1 | ||
| Set, // 23.2 | ||
| WeakMap, // 23.3 | ||
| WeakSet, // 23.4 | ||
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| // 24 Structured Data | ||
| ArrayBuffer, // 24.1 | ||
| DataView, // 24.3 | ||
| JSON, // 24.5 | ||
| Promise, // 25.4 | ||
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| // 26 Reflection | ||
| Reflect, // 26.1 | ||
| Proxy, // 26.2 | ||
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| // B.2.1 | ||
| escape, | ||
| unescape, | ||
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| // Web compatibility | ||
| clearImmediate, | ||
| clearInterval, | ||
| clearTimeout, | ||
| decodeURI, | ||
| decodeURIComponent, | ||
| encodeURI, | ||
| encodeURIComponent, | ||
| setImmediate, | ||
| setInterval, | ||
| setTimeout, | ||
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| // Other APIs | ||
| console, | ||
| BigInt, | ||
| Atomics, | ||
| WebAssembly, | ||
| SharedArrayBuffer | ||
| ]; | ||
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| if (typeof Intl !== 'undefined') | ||
| intrinsics.push(Intl); | ||
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| intrinsics.forEach(deepFreeze); | ||
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| function deepFreeze(root) { | ||
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| const { freeze, getOwnPropertyDescriptors, getPrototypeOf } = Object; | ||
| const { ownKeys } = Reflect; | ||
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| // Objects that are deeply frozen. | ||
| // It turns out that Error is reachable from WebAssembly so it is | ||
| // explicitly added here to ensure it is not frozen | ||
| const frozenSet = new WeakSet([Error, Error.prototype]); | ||
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| /** | ||
| * "innerDeepFreeze()" acts like "Object.freeze()", except that: | ||
| * | ||
| * To deepFreeze an object is to freeze it and all objects transitively | ||
| * reachable from it via transitive reflective property and prototype | ||
| * traversal. | ||
| */ | ||
| function innerDeepFreeze(node) { | ||
| // Objects that we have frozen in this round. | ||
| const freezingSet = new Set(); | ||
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| // If val is something we should be freezing but aren't yet, | ||
| // add it to freezingSet. | ||
| function enqueue(val) { | ||
| if (Object(val) !== val) { | ||
| // ignore primitives | ||
| return; | ||
| } | ||
| const type = typeof val; | ||
| if (type !== 'object' && type !== 'function') { | ||
| // NB: handle for any new cases in future | ||
| } | ||
| if (frozenSet.has(val) || freezingSet.has(val)) { | ||
| // todo use uncurried form | ||
| // Ignore if already frozen or freezing | ||
| return; | ||
| } | ||
| freezingSet.add(val); // todo use uncurried form | ||
| } | ||
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| function doFreeze(obj) { | ||
| // Immediately freeze the object to ensure reactive | ||
| // objects such as proxies won't add properties | ||
| // during traversal, before they get frozen. | ||
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| // Object are verified before being enqueued, | ||
| // therefore this is a valid candidate. | ||
| // Throws if this fails (strict mode). | ||
| freeze(obj); | ||
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| // We rely upon certain commitments of Object.freeze and proxies here | ||
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| // Get stable/immutable outbound links before a Proxy has a chance to do | ||
| // something sneaky. | ||
| const proto = getPrototypeOf(obj); | ||
| const descs = getOwnPropertyDescriptors(obj); | ||
| enqueue(proto); | ||
| ownKeys(descs).forEach((name) => { | ||
| // todo uncurried form | ||
| // todo: getOwnPropertyDescriptors is guaranteed to return well-formed | ||
| // descriptors, but they still inherit from Object.prototype. If | ||
| // someone has poisoned Object.prototype to add 'value' or 'get' | ||
| // properties, then a simple 'if ("value" in desc)' or 'desc.value' | ||
| // test could be confused. We use hasOwnProperty to be sure about | ||
| // whether 'value' is present or not, which tells us for sure that | ||
| // this is a data property. | ||
| const desc = descs[name]; | ||
| if ('value' in desc) { | ||
| // todo uncurried form | ||
| enqueue(desc.value); | ||
| } else { | ||
| enqueue(desc.get); | ||
| enqueue(desc.set); | ||
| } | ||
| }); | ||
| } | ||
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| function dequeue() { | ||
| // New values added before forEach() has finished will be visited. | ||
| freezingSet.forEach(doFreeze); // todo curried forEach | ||
| } | ||
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| function commit() { | ||
| // todo curried forEach | ||
| // we capture the real WeakSet.prototype.add above, in case someone | ||
| // changes it. The two-argument form of forEach passes the second | ||
| // argument as the 'this' binding, so we add to the correct set. | ||
| freezingSet.forEach(frozenSet.add, frozenSet); | ||
| } | ||
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| enqueue(node); | ||
| dequeue(); | ||
| commit(); | ||
| } | ||
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| innerDeepFreeze(root); | ||
| return root; | ||
| } | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| // Flags: --frozen-intrinsics | ||
| 'use strict'; | ||
| require('../common'); | ||
| const assert = require('assert'); | ||
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| try { | ||
| Object.defineProperty = 'asdf'; | ||
| assert(false); | ||
| } catch { | ||
| } |
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