tor-browser

shell.js (11923B)

---

// GENERATED, DO NOT EDIT
// file: atomicsHelper.js
// Copyright (C) 2017 Mozilla Corporation.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: >
   Collection of functions used to interact with Atomics.* operations across agent boundaries.
defines:
 - $262.agent.getReportAsync
 - $262.agent.getReport
 - $262.agent.safeBroadcastAsync
 - $262.agent.safeBroadcast
 - $262.agent.setTimeout
 - $262.agent.tryYield
 - $262.agent.trySleep
---*/

/**
* @return {String} A report sent from an agent.
*/
{
 // This is only necessary because the original
 // $262.agent.getReport API was insufficient.
 //
 // All runtimes currently have their own
 // $262.agent.getReport which is wrong, so we
 // will pave over it with a corrected version.
 //
 // Binding $262.agent is necessary to prevent
 // breaking SpiderMonkey's $262.agent.getReport
 let getReport = $262.agent.getReport.bind($262.agent);

 $262.agent.getReport = function() {
   var r;
   while ((r = getReport()) == null) {
     $262.agent.sleep(1);
   }
   return r;
 };

 if (this.setTimeout === undefined) {
   (function(that) {
     that.setTimeout = function(callback, delay) {
       let p = Promise.resolve();
       let start = Date.now();
       let end = start + delay;
       function check() {
         if ((end - Date.now()) > 0) {
           p.then(check);
         }
         else {
           callback();
         }
       }
       p.then(check);
     }
   })(this);
 }

 $262.agent.setTimeout = setTimeout;

 $262.agent.getReportAsync = function() {
   return new Promise(function(resolve) {
     (function loop() {
       let result = getReport();
       if (!result) {
         setTimeout(loop, 1000);
       } else {
         resolve(result);
       }
     })();
   });
 };
}

/**
*
* Share a given Int32Array or BigInt64Array to all running agents. Ensure that the
* provided TypedArray is a "shared typed array".
*
* NOTE: Migrating all tests to this API is necessary to prevent tests from hanging
* indefinitely when a SAB is sent to a worker but the code in the worker attempts to
* create a non-sharable TypedArray (something that is not Int32Array or BigInt64Array).
* When that scenario occurs, an exception is thrown and the agent worker can no
* longer communicate with any other threads that control the SAB. If the main
* thread happens to be spinning in the $262.agent.waitUntil() while loop, it will never
* meet its termination condition and the test will hang indefinitely.
*
* Because we've defined $262.agent.broadcast(SAB) in
* https://github.com/tc39/test262/blob/HEAD/INTERPRETING.md, there are host implementations
* that assume compatibility, which must be maintained.
*
*
* $262.agent.safeBroadcast(TA) should not be included in
* https://github.com/tc39/test262/blob/HEAD/INTERPRETING.md
*
*
* @param {(Int32Array|BigInt64Array)} typedArray An Int32Array or BigInt64Array with a SharedArrayBuffer
*/
$262.agent.safeBroadcast = function(typedArray) {
 let Constructor = Object.getPrototypeOf(typedArray).constructor;
 let temp = new Constructor(
   new SharedArrayBuffer(Constructor.BYTES_PER_ELEMENT)
 );
 try {
   // This will never actually wait, but that's fine because we only
   // want to ensure that this typedArray CAN be waited on and is shareable.
   Atomics.wait(temp, 0, Constructor === Int32Array ? 1 : BigInt(1));
 } catch (error) {
   throw new Test262Error(`${Constructor.name} cannot be used as a shared typed array. (${error})`);
 }

 $262.agent.broadcast(typedArray.buffer);
};

$262.agent.safeBroadcastAsync = async function(ta, index, expected) {
 await $262.agent.broadcast(ta.buffer);
 await $262.agent.waitUntil(ta, index, expected);
 await $262.agent.tryYield();
 return await Atomics.load(ta, index);
};


/**
* With a given Int32Array or BigInt64Array, wait until the expected number of agents have
* reported themselves by calling:
*
*    Atomics.add(typedArray, index, 1);
*
* @param {(Int32Array|BigInt64Array)} typedArray An Int32Array or BigInt64Array with a SharedArrayBuffer
* @param {number} index    The index of which all agents will report.
* @param {number} expected The number of agents that are expected to report as active.
*/
$262.agent.waitUntil = function(typedArray, index, expected) {

 var agents = 0;
 while ((agents = Atomics.load(typedArray, index)) !== expected) {
   /* nothing */
 }
 assert.sameValue(agents, expected, "Reporting number of 'agents' equals the value of 'expected'");
};

/**
* Timeout values used throughout the Atomics tests. All timeouts are specified in milliseconds.
*
* @property {number} yield Used for `$262.agent.tryYield`. Must not be used in other functions.
* @property {number} small Used when agents will always timeout and `Atomics.wake` is not part
*                          of the test semantics. Must be larger than `$262.agent.timeouts.yield`.
* @property {number} long  Used when some agents may timeout and `Atomics.wake` is called on some
*                          agents. The agents are required to wait and this needs to be observable
*                          by the main thread.
* @property {number} huge  Used when `Atomics.wake` is called on all waiting agents. The waiting
*                          must not timeout. The agents are required to wait and this needs to be
*                          observable by the main thread. All waiting agents must be woken by the
*                          main thread.
*
* Usage for `$262.agent.timeouts.small`:
*   const WAIT_INDEX = 0;
*   const RUNNING = 1;
*   const TIMEOUT = $262.agent.timeouts.small;
*   const i32a = new Int32Array(new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 2));
*
*   $262.agent.start(`
*     $262.agent.receiveBroadcast(function(sab) {
*       const i32a = new Int32Array(sab);
*       Atomics.add(i32a, ${RUNNING}, 1);
*
*       $262.agent.report(Atomics.wait(i32a, ${WAIT_INDEX}, 0, ${TIMEOUT}));
*
*       $262.agent.leaving();
*     });
*   `);
*   $262.agent.safeBroadcast(i32a.buffer);
*
*   // Wait until the agent was started and then try to yield control to increase
*   // the likelihood the agent has called `Atomics.wait` and is now waiting.
*   $262.agent.waitUntil(i32a, RUNNING, 1);
*   $262.agent.tryYield();
*
*   // The agent is expected to time out.
*   assert.sameValue($262.agent.getReport(), "timed-out");
*
*
* Usage for `$262.agent.timeouts.long`:
*   const WAIT_INDEX = 0;
*   const RUNNING = 1;
*   const NUMAGENT = 2;
*   const TIMEOUT = $262.agent.timeouts.long;
*   const i32a = new Int32Array(new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 2));
*
*   for (let i = 0; i < NUMAGENT; i++) {
*     $262.agent.start(`
*       $262.agent.receiveBroadcast(function(sab) {
*         const i32a = new Int32Array(sab);
*         Atomics.add(i32a, ${RUNNING}, 1);
*
*         $262.agent.report(Atomics.wait(i32a, ${WAIT_INDEX}, 0, ${TIMEOUT}));
*
*         $262.agent.leaving();
*       });
*     `);
*   }
*   $262.agent.safeBroadcast(i32a.buffer);
*
*   // Wait until the agents were started and then try to yield control to increase
*   // the likelihood the agents have called `Atomics.wait` and are now waiting.
*   $262.agent.waitUntil(i32a, RUNNING, NUMAGENT);
*   $262.agent.tryYield();
*
*   // Wake exactly one agent.
*   assert.sameValue(Atomics.wake(i32a, WAIT_INDEX, 1), 1);
*
*   // When it doesn't matter how many agents were woken at once, a while loop
*   // can be used to make the test more resilient against intermittent failures
*   // in case even though `tryYield` was called, the agents haven't started to
*   // wait.
*   //
*   // // Repeat until exactly one agent was woken.
*   // var woken = 0;
*   // while ((woken = Atomics.wake(i32a, WAIT_INDEX, 1)) !== 0) ;
*   // assert.sameValue(woken, 1);
*
*   // One agent was woken and the other one timed out.
*   const reports = [$262.agent.getReport(), $262.agent.getReport()];
*   assert(reports.includes("ok"));
*   assert(reports.includes("timed-out"));
*
*
* Usage for `$262.agent.timeouts.huge`:
*   const WAIT_INDEX = 0;
*   const RUNNING = 1;
*   const NUMAGENT = 2;
*   const TIMEOUT = $262.agent.timeouts.huge;
*   const i32a = new Int32Array(new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 2));
*
*   for (let i = 0; i < NUMAGENT; i++) {
*     $262.agent.start(`
*       $262.agent.receiveBroadcast(function(sab) {
*         const i32a = new Int32Array(sab);
*         Atomics.add(i32a, ${RUNNING}, 1);
*
*         $262.agent.report(Atomics.wait(i32a, ${WAIT_INDEX}, 0, ${TIMEOUT}));
*
*         $262.agent.leaving();
*       });
*     `);
*   }
*   $262.agent.safeBroadcast(i32a.buffer);
*
*   // Wait until the agents were started and then try to yield control to increase
*   // the likelihood the agents have called `Atomics.wait` and are now waiting.
*   $262.agent.waitUntil(i32a, RUNNING, NUMAGENT);
*   $262.agent.tryYield();
*
*   // Wake all agents.
*   assert.sameValue(Atomics.wake(i32a, WAIT_INDEX), NUMAGENT);
*
*   // When it doesn't matter how many agents were woken at once, a while loop
*   // can be used to make the test more resilient against intermittent failures
*   // in case even though `tryYield` was called, the agents haven't started to
*   // wait.
*   //
*   // // Repeat until all agents were woken.
*   // for (var wokenCount = 0; wokenCount < NUMAGENT; ) {
*   //   var woken = 0;
*   //   while ((woken = Atomics.wake(i32a, WAIT_INDEX)) !== 0) ;
*   //   // Maybe perform an action on the woken agents here.
*   //   wokenCount += woken;
*   // }
*
*   // All agents were woken and none timeout.
*   for (var i = 0; i < NUMAGENT; i++) {
*     assert($262.agent.getReport(), "ok");
*   }
*/
$262.agent.timeouts = {
 yield: 100,
 small: 200,
 long: 1000,
 huge: 10000,
};

/**
* Try to yield control to the agent threads.
*
* Usage:
*   const VALUE = 0;
*   const RUNNING = 1;
*   const i32a = new Int32Array(new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 2));
*
*   $262.agent.start(`
*     $262.agent.receiveBroadcast(function(sab) {
*       const i32a = new Int32Array(sab);
*       Atomics.add(i32a, ${RUNNING}, 1);
*
*       Atomics.store(i32a, ${VALUE}, 1);
*
*       $262.agent.leaving();
*     });
*   `);
*   $262.agent.safeBroadcast(i32a.buffer);
*
*   // Wait until agent was started and then try to yield control.
*   $262.agent.waitUntil(i32a, RUNNING, 1);
*   $262.agent.tryYield();
*
*   // Note: This result is not guaranteed, but should hold in practice most of the time.
*   assert.sameValue(Atomics.load(i32a, VALUE), 1);
*
* The default implementation simply waits for `$262.agent.timeouts.yield` milliseconds.
*/
$262.agent.tryYield = function() {
 $262.agent.sleep($262.agent.timeouts.yield);
};

/**
* Try to sleep the current agent for the given amount of milliseconds. It is acceptable,
* but not encouraged, to ignore this sleep request and directly continue execution.
*
* The default implementation calls `$262.agent.sleep(ms)`.
*
* @param {number} ms Time to sleep in milliseconds.
*/
$262.agent.trySleep = function(ms) {
 $262.agent.sleep(ms);
};

// file: detachArrayBuffer.js
// Copyright (C) 2016 the V8 project authors.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: |
   A function used in the process of asserting correctness of TypedArray objects.

   $262.detachArrayBuffer is defined by a host.
defines: [$DETACHBUFFER]
---*/

function $DETACHBUFFER(buffer) {
 if (!$262 || typeof $262.detachArrayBuffer !== "function") {
   throw new Test262Error("No method available to detach an ArrayBuffer");
 }
 $262.detachArrayBuffer(buffer);
}