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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>- Loading branch information
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,128 +1,138 @@ | ||
| 'use strict'; | ||
|
|
||
| exports.setup = setupNextTick; | ||
|
|
||
| function setupNextTick(_setupNextTick, _setupPromises) { | ||
| const { | ||
| getDefaultTriggerAsyncId, | ||
| newAsyncId, | ||
| initHooksExist, | ||
| destroyHooksExist, | ||
| emitInit, | ||
| emitBefore, | ||
| emitAfter, | ||
| emitDestroy, | ||
| symbols: { async_id_symbol, trigger_async_id_symbol } | ||
| } = require('internal/async_hooks'); | ||
| const emitPromiseRejectionWarnings = | ||
| require('internal/process/promises').setup(_setupPromises); | ||
| const { ERR_INVALID_CALLBACK } = require('internal/errors').codes; | ||
| const FixedQueue = require('internal/fixed_queue'); | ||
|
|
||
| // tickInfo is used so that the C++ code in src/node.cc can | ||
| // have easy access to our nextTick state, and avoid unnecessary | ||
| // calls into JS land. | ||
| // runMicrotasks is used to run V8's micro task queue. | ||
| const [ | ||
| tickInfo, | ||
| runMicrotasks | ||
| ] = _setupNextTick(internalTickCallback); | ||
|
|
||
| // *Must* match Environment::TickInfo::Fields in src/env.h. | ||
| const kHasScheduled = 0; | ||
| const kHasPromiseRejections = 1; | ||
|
|
||
| const queue = new FixedQueue(); | ||
|
|
||
| process.nextTick = nextTick; | ||
| // Needs to be accessible from beyond this scope. | ||
| process._tickCallback = _tickCallback; | ||
|
|
||
| function _tickCallback() { | ||
| if (tickInfo[kHasScheduled] === 0 && tickInfo[kHasPromiseRejections] === 0) | ||
| runMicrotasks(); | ||
| if (tickInfo[kHasScheduled] === 0 && tickInfo[kHasPromiseRejections] === 0) | ||
| return; | ||
|
|
||
| internalTickCallback(); | ||
| } | ||
|
|
||
| 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); | ||
|
|
||
| const callback = tock.callback; | ||
| if (tock.args === undefined) | ||
| callback(); | ||
| else | ||
| Reflect.apply(callback, undefined, tock.args); | ||
|
|
||
| emitAfter(asyncId); | ||
| } | ||
| tickInfo[kHasScheduled] = 0; | ||
| runMicrotasks(); | ||
| } while (!queue.isEmpty() || emitPromiseRejectionWarnings()); | ||
| tickInfo[kHasPromiseRejections] = 0; | ||
| } | ||
| const { | ||
| // For easy access to the nextTick state in the C++ land, | ||
| // and to avoid unnecessary calls into JS land. | ||
| tickInfo, | ||
| // Used to run V8's micro task queue. | ||
| runMicrotasks, | ||
| setTickCallback, | ||
| initializePromiseRejectCallback | ||
| } = internalBinding('task_queue'); | ||
|
|
||
| const { | ||
| promiseRejectHandler, | ||
| emitPromiseRejectionWarnings | ||
| } = require('internal/process/promises'); | ||
|
|
||
| const { | ||
| getDefaultTriggerAsyncId, | ||
| newAsyncId, | ||
| initHooksExist, | ||
| destroyHooksExist, | ||
| emitInit, | ||
| emitBefore, | ||
| emitAfter, | ||
| emitDestroy, | ||
| symbols: { async_id_symbol, trigger_async_id_symbol } | ||
| } = require('internal/async_hooks'); | ||
| const { ERR_INVALID_CALLBACK } = require('internal/errors').codes; | ||
| const FixedQueue = require('internal/fixed_queue'); | ||
|
|
||
| // *Must* match Environment::TickInfo::Fields in src/env.h. | ||
| const kHasScheduled = 0; | ||
| const kHasPromiseRejections = 1; | ||
|
|
||
| const queue = new FixedQueue(); | ||
|
|
||
| function runNextTicks() { | ||
| if (tickInfo[kHasScheduled] === 0 && tickInfo[kHasPromiseRejections] === 0) | ||
| runMicrotasks(); | ||
| if (tickInfo[kHasScheduled] === 0 && tickInfo[kHasPromiseRejections] === 0) | ||
| return; | ||
|
|
||
| internalTickCallback(); | ||
| } | ||
|
|
||
| class TickObject { | ||
| constructor(callback, args, triggerAsyncId) { | ||
| // This must be set to null first to avoid function tracking | ||
| // on the hidden class, revisit in V8 versions after 6.2 | ||
| this.callback = null; | ||
| this.callback = callback; | ||
| this.args = args; | ||
|
|
||
| const asyncId = newAsyncId(); | ||
| this[async_id_symbol] = asyncId; | ||
| this[trigger_async_id_symbol] = triggerAsyncId; | ||
|
|
||
| if (initHooksExist()) { | ||
| emitInit(asyncId, | ||
| 'TickObject', | ||
| triggerAsyncId, | ||
| this); | ||
| } | ||
| 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); | ||
|
|
||
| const callback = tock.callback; | ||
| if (tock.args === undefined) | ||
| callback(); | ||
| else | ||
| Reflect.apply(callback, undefined, tock.args); | ||
|
|
||
| emitAfter(asyncId); | ||
| } | ||
| } | ||
| tickInfo[kHasScheduled] = 0; | ||
| runMicrotasks(); | ||
| } while (!queue.isEmpty() || emitPromiseRejectionWarnings()); | ||
| tickInfo[kHasPromiseRejections] = 0; | ||
| } | ||
|
|
||
| // `nextTick()` will not enqueue any callback when the process is about to | ||
| // exit since the callback would not have a chance to be executed. | ||
| function nextTick(callback) { | ||
| if (typeof callback !== 'function') | ||
| throw new ERR_INVALID_CALLBACK(); | ||
|
|
||
| if (process._exiting) | ||
| return; | ||
|
|
||
| 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]; | ||
| class TickObject { | ||
| constructor(callback, args, triggerAsyncId) { | ||
| // This must be set to null first to avoid function tracking | ||
| // on the hidden class, revisit in V8 versions after 6.2 | ||
| this.callback = null; | ||
| this.callback = callback; | ||
| this.args = args; | ||
|
|
||
| const asyncId = newAsyncId(); | ||
| this[async_id_symbol] = asyncId; | ||
| this[trigger_async_id_symbol] = triggerAsyncId; | ||
|
|
||
| if (initHooksExist()) { | ||
| emitInit(asyncId, | ||
| 'TickObject', | ||
| triggerAsyncId, | ||
| this); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if (queue.isEmpty()) | ||
| tickInfo[kHasScheduled] = 1; | ||
| queue.push(new TickObject(callback, args, getDefaultTriggerAsyncId())); | ||
| // `nextTick()` will not enqueue any callback when the process is about to | ||
| // exit since the callback would not have a chance to be executed. | ||
| function nextTick(callback) { | ||
| if (typeof callback !== 'function') | ||
| throw new ERR_INVALID_CALLBACK(); | ||
|
|
||
| if (process._exiting) | ||
| return; | ||
|
|
||
| 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]; | ||
| } | ||
|
|
||
| if (queue.isEmpty()) | ||
| tickInfo[kHasScheduled] = 1; | ||
| queue.push(new TickObject(callback, args, getDefaultTriggerAsyncId())); | ||
| } | ||
|
|
||
| // 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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