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Questions tagged [v8]

V8 is Google's open source JavaScript engine.

About V8

V8 is Google's Javascript engine that is used in Google Chrome (). It is written in C++ (), and is open source, which can be checked out by following the instructions on the v8 wiki.

V8 can run standalone, or can be embedded into C++ applications.

Documentation on V8 can be found on its wiki pages.

There are a number of flags that can be passed to V8 to expose its internals. For instance, --trace-deopt gets V8 to log code deoptimizations, and --expose-gc allows scripts to manually invoke a garbage collection. The full list of flags can be found by reading the source.

Links:

Tag Usage

Use this tag to ask questions about:

  • Usage of the V8 API
  • Performance and profiling with V8
  • How V8 works
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What is LdaKeyedProperty in V8 byte code?

This is a sample V8 byte code. 984 E> 00000318BA8792D3 @ 41 : 29 02 07 LdaKeyedProperty a0, [7]
ZhefengJin
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How to get the correct js context in v8

I am trying the c++ plugin in nodejs, this is my test code let obj = new addon.MyClass(function (v) { console.log(v); }); obj.run(1); setTimeout(() => { obj.run(3); // [TypeError: obj.run is not a function] }, 1000); When I call the function…
januw a
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How is Zoom able to launch itself from the browser?

When opening a Zoom link, the browsers shows a popup that asks if you'd like to launch zoom. Then, the Zoom desktop installation is launched. What is the mechanism for doing this? I thought you couldn't access the local system from Javascript.
JeanAlesi
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Why is getting from Map slower than getting from object?

I'm considering migrating my state management layer to using Map versus using a standard object. From what I've read, Map is effectively a hash table whereas Objects use hidden classes under the hood. Generally it's advised, where the properties are…
david_adler
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How to export Node.js V8 profiling info to Chrome's Dev Tools performance profile?

According to Node.js documentation profiling info can be generated using node --prof myapp.js. Is there a way to convert from this generated format to Chrome's Dev Tools performance profile? It expects to load a JSON format while the format…
Renan
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How to Get Proper Formatting with the V8 Google Apps Script IDE

Edit: Fixed! The Google Apps Script team rolled this out for our team earlier this week (week of January 10th). Original Post I'm a frequent GAS user, and I've noticed that, since the upgrade to the V8 runtime, formatting in the GAS IDE is awful.…
Davis Jones
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In JS memory are objects stored as a block?

I was wondering if an object e.g. const numbers = { a: 1, b: 2, c: 3 }; is stored as a group in memory so that the variable 'numbers' refers to the entire object in one place, or if each of it's individual keys are stored in…
j obe
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An error occurred while installing "gem" and Bundler cannot continue. Mac OS - big sur

This error happened to me before with nio4r gem when I upgraded to Catalina and @dmitry barskov answered it. A similar issue is happening now after big sur upgrade with json, oj and therubyracer (tried using the solution from nio4r, but no luck).…
trailblazer
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Nativescript 7 App unexpectedly crashes in ios == Assertion failed ==

I am developing an app using Nativescript 7 and it keeps crashing unexpectedly in iOS. All versions of iOS crash (12, 13, and 14 so far). Here is the stack trace: ====== Assertion failed ====== Native stack trace: 1 0x10ac972af…
Amjad Abujamous
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How does chrome assign interpreted javascript functionality to its widgets?

I have been looking closely into web browers and the v8 engine. I understand the concept of G.U.I and how its possible to dynamically change the G.U.I in your applications on the go, but the confusion of the v8 engine comes when I start to think…
RonRon Scores
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NodeJS v14 memory issues: Resident Set grows a lot

After I upgraded a NodeJS server application from v6 to v14, I am facing with a strange memory behavior. I noticed this issue (if it is) when I analyzed the memory usage using Dynatrace: the process gives no problems, nor restarts nor failure have…
shogitai
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v8 : visual studio release compilation static lib error: lld-link: error: could not open 'obj/v8_wrappers.lib': no such file or directory

i followed all the steps from https://v8.dev/docs/build-gn to build release-static v8 lib but I'm getting this error : using VC 2019 , win10 64bit from https://v8.dev/docs/build-gn doing git branch it shows : c:\Dev\my\v8\depot_tools\v8\v8>git…
user63898
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What's the difference between effect and control edges of V8's TurboFan?

I've read many blog posts, articles, presentation and videos, even inspected V8's source code, both the bytecode generator, the sea-of-nodes graph generator and the optimization phases, and still couldn't find an answer. V8's optimizing compiler,…
Chayim Friedman
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Typescript v8 natives syntax Expression expected

Using Typescript 4.1.2 is it possible to compile code that references the functions one calls when the --allow-natives-syntax flag in v8 is set? For example: function foo(bar: ()=>void)): void { %OptimizeFunctionOnNextCall(bar); // --> TS1109;…
Ryder Brooks
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V8 Isolates - is there a limit to the number of instances? Crashes at 4.7k instances

I am testing the limits of V8, and how many instances it can create, but I encounter the following error. This uses about 18TB of virtual memory, and 3500MB of real memory. I've previously run programs with 120TB of virtual memory, so I don't think…
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