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src: move process.nextTick and promise setup into node_task_queue.cc
This patch: - Moves the process.nextTick and promise setup C++ code into node_task_queue.cc which is exposed as `internalBinding('task_queue')` - Makes `lib/internal/process/promises.js` and `lib/internal/process/next_tick.js` as side-effect-free as possible - Removes the bootstrapper object being passed into `bootstrap/node.js`, let `next_tick.js` and `promises.js` load whatever they need from `internalBinding('task_queue')` instead. - Rename `process._tickCallback` to `runNextTicks` internally for clarity but still expose it as `process._tickCallback`. PR-URL: #25163 Refs: #24961 Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
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Original file line number | Original file line | Diff line number | Diff line change |
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@@ -1,128 +1,138 @@ | |||
'use strict'; | 'use strict'; | ||
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exports.setup = setupNextTick; | const { | ||
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// For easy access to the nextTick state in the C++ land, | ||
function setupNextTick(_setupNextTick, _setupPromises) { | // and to avoid unnecessary calls into JS land. | ||
const { | tickInfo, | ||
getDefaultTriggerAsyncId, | // Used to run V8's micro task queue. | ||
newAsyncId, | runMicrotasks, | ||
initHooksExist, | setTickCallback, | ||
destroyHooksExist, | initializePromiseRejectCallback | ||
emitInit, | } = internalBinding('task_queue'); | ||
emitBefore, |
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emitAfter, | const { | ||
emitDestroy, | promiseRejectHandler, | ||
symbols: { async_id_symbol, trigger_async_id_symbol } | emitPromiseRejectionWarnings | ||
} = require('internal/async_hooks'); | } = require('internal/process/promises'); | ||
const emitPromiseRejectionWarnings = |
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require('internal/process/promises').setup(_setupPromises); | const { | ||
const { ERR_INVALID_CALLBACK } = require('internal/errors').codes; | getDefaultTriggerAsyncId, | ||
const FixedQueue = require('internal/fixed_queue'); | newAsyncId, | ||
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initHooksExist, | ||
// tickInfo is used so that the C++ code in src/node.cc can | destroyHooksExist, | ||
// have easy access to our nextTick state, and avoid unnecessary | emitInit, | ||
// calls into JS land. | emitBefore, | ||
// runMicrotasks is used to run V8's micro task queue. | emitAfter, | ||
const [ | emitDestroy, | ||
tickInfo, | symbols: { async_id_symbol, trigger_async_id_symbol } | ||
runMicrotasks | } = require('internal/async_hooks'); | ||
] = _setupNextTick(internalTickCallback); | const { ERR_INVALID_CALLBACK } = require('internal/errors').codes; | ||
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const FixedQueue = require('internal/fixed_queue'); | ||
// *Must* match Environment::TickInfo::Fields in src/env.h. |
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const kHasScheduled = 0; | // *Must* match Environment::TickInfo::Fields in src/env.h. | ||
const kHasPromiseRejections = 1; | const kHasScheduled = 0; | ||
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const kHasPromiseRejections = 1; | ||
const queue = new FixedQueue(); |
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const queue = new FixedQueue(); | ||
process.nextTick = nextTick; |
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// Needs to be accessible from beyond this scope. | function runNextTicks() { | ||
process._tickCallback = _tickCallback; | if (tickInfo[kHasScheduled] === 0 && tickInfo[kHasPromiseRejections] === 0) | ||
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runMicrotasks(); | ||
function _tickCallback() { | if (tickInfo[kHasScheduled] === 0 && tickInfo[kHasPromiseRejections] === 0) | ||
if (tickInfo[kHasScheduled] === 0 && tickInfo[kHasPromiseRejections] === 0) | return; | ||
runMicrotasks(); |
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if (tickInfo[kHasScheduled] === 0 && tickInfo[kHasPromiseRejections] === 0) | internalTickCallback(); | ||
return; | } | ||
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internalTickCallback(); | |||
} | |||
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function internalTickCallback() { | |||
let tock; | |||
do { | |||
while (tock = queue.shift()) { | |||
const asyncId = tock[async_id_symbol]; | |||
emitBefore(asyncId, tock[trigger_async_id_symbol]); | |||
// emitDestroy() places the async_id_symbol into an asynchronous queue | |||
// that calls the destroy callback in the future. It's called before | |||
// calling tock.callback so destroy will be called even if the callback | |||
// throws an exception that is handled by 'uncaughtException' or a | |||
// domain. | |||
// TODO(trevnorris): This is a bit of a hack. It relies on the fact | |||
// that nextTick() doesn't allow the event loop to proceed, but if | |||
// any async hooks are enabled during the callback's execution then | |||
// this tock's after hook will be called, but not its destroy hook. | |||
if (destroyHooksExist()) | |||
emitDestroy(asyncId); | |||
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const callback = tock.callback; | |||
if (tock.args === undefined) | |||
callback(); | |||
else | |||
Reflect.apply(callback, undefined, tock.args); | |||
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emitAfter(asyncId); | |||
} | |||
tickInfo[kHasScheduled] = 0; | |||
runMicrotasks(); | |||
} while (!queue.isEmpty() || emitPromiseRejectionWarnings()); | |||
tickInfo[kHasPromiseRejections] = 0; | |||
} | |||
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class TickObject { | function internalTickCallback() { | ||
constructor(callback, args, triggerAsyncId) { | let tock; | ||
// This must be set to null first to avoid function tracking | do { | ||
// on the hidden class, revisit in V8 versions after 6.2 | while (tock = queue.shift()) { | ||
this.callback = null; | const asyncId = tock[async_id_symbol]; | ||
this.callback = callback; | emitBefore(asyncId, tock[trigger_async_id_symbol]); | ||
this.args = args; | // emitDestroy() places the async_id_symbol into an asynchronous queue | ||
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// that calls the destroy callback in the future. It's called before | ||
const asyncId = newAsyncId(); | // calling tock.callback so destroy will be called even if the callback | ||
this[async_id_symbol] = asyncId; | // throws an exception that is handled by 'uncaughtException' or a | ||
this[trigger_async_id_symbol] = triggerAsyncId; | // domain. | ||
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// TODO(trevnorris): This is a bit of a hack. It relies on the fact | ||
if (initHooksExist()) { | // that nextTick() doesn't allow the event loop to proceed, but if | ||
emitInit(asyncId, | // any async hooks are enabled during the callback's execution then | ||
'TickObject', | // this tock's after hook will be called, but not its destroy hook. | ||
triggerAsyncId, | if (destroyHooksExist()) | ||
this); | emitDestroy(asyncId); | ||
} |
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const callback = tock.callback; | |||
if (tock.args === undefined) | |||
callback(); | |||
else | |||
Reflect.apply(callback, undefined, tock.args); | |||
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emitAfter(asyncId); | |||
} | } | ||
} | tickInfo[kHasScheduled] = 0; | ||
runMicrotasks(); | |||
} while (!queue.isEmpty() || emitPromiseRejectionWarnings()); | |||
tickInfo[kHasPromiseRejections] = 0; | |||
} | |||
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// `nextTick()` will not enqueue any callback when the process is about to | class TickObject { | ||
// exit since the callback would not have a chance to be executed. | constructor(callback, args, triggerAsyncId) { | ||
function nextTick(callback) { | // This must be set to null first to avoid function tracking | ||
if (typeof callback !== 'function') | // on the hidden class, revisit in V8 versions after 6.2 | ||
throw new ERR_INVALID_CALLBACK(); | this.callback = null; | ||
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this.callback = callback; | ||
if (process._exiting) | this.args = args; | ||
return; |
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const asyncId = newAsyncId(); | ||
var args; | this[async_id_symbol] = asyncId; | ||
switch (arguments.length) { | this[trigger_async_id_symbol] = triggerAsyncId; | ||
case 1: break; |
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case 2: args = [arguments[1]]; break; | if (initHooksExist()) { | ||
case 3: args = [arguments[1], arguments[2]]; break; | emitInit(asyncId, | ||
case 4: args = [arguments[1], arguments[2], arguments[3]]; break; | 'TickObject', | ||
default: | triggerAsyncId, | ||
args = new Array(arguments.length - 1); | this); | ||
for (var i = 1; i < arguments.length; i++) | |||
args[i - 1] = arguments[i]; | |||
} | } | ||
} | |||
} | |||
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if (queue.isEmpty()) | // `nextTick()` will not enqueue any callback when the process is about to | ||
tickInfo[kHasScheduled] = 1; | // exit since the callback would not have a chance to be executed. | ||
queue.push(new TickObject(callback, args, getDefaultTriggerAsyncId())); | function nextTick(callback) { | ||
if (typeof callback !== 'function') | |||
throw new ERR_INVALID_CALLBACK(); | |||
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if (process._exiting) | |||
return; | |||
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var args; | |||
switch (arguments.length) { | |||
case 1: break; | |||
case 2: args = [arguments[1]]; break; | |||
case 3: args = [arguments[1], arguments[2]]; break; | |||
case 4: args = [arguments[1], arguments[2], arguments[3]]; break; | |||
default: | |||
args = new Array(arguments.length - 1); | |||
for (var i = 1; i < arguments.length; i++) | |||
args[i - 1] = arguments[i]; | |||
} | } | ||
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if (queue.isEmpty()) | |||
tickInfo[kHasScheduled] = 1; | |||
queue.push(new TickObject(callback, args, getDefaultTriggerAsyncId())); | |||
} | } | ||
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// TODO(joyeecheung): make this a factory class so that node.js can | |||
// control the side effects caused by the initializers. | |||
exports.setup = function() { | |||
// Initializes the per-isolate promise rejection callback which | |||
// will call the handler being passed into this function. | |||
initializePromiseRejectCallback(promiseRejectHandler); | |||
// Sets the callback to be run in every tick. | |||
setTickCallback(internalTickCallback); | |||
return { | |||
nextTick, | |||
runNextTicks | |||
}; | |||
}; |
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