v8 | open source javascript engine
kandi X-RAY | v8 Summary
kandi X-RAY | v8 Summary
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QUESTION
When i tried to install truffle i got these errors :-
I have installed Node.js earlier and also i have pip installed.
...ANSWER
Answered 2022-Jan-26 at 17:42Here are some references that might help:
Try installing Truffle via PowerShell in Admin mode (very important that you're in Admin mode)
You'll need to allow scripts to run as an Admin in PowerShell. To do this, here are some references in the threads in Stack Overflow:
Enable Execution of PowerShell Scripts
I ran the command Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy Bypass -Force
in PowerShell to get this to work, but please reference the threads above before doing this.
QUESTION
I have yaml
pipeline running a build in Azure Devops. The Npm@1
task has started failing this morning. npm install
works locally with npm version 6.14.5 and it's all green lights on npm Status.
ANSWER
Answered 2021-Dec-02 at 13:14I still don't know why this started failing all of a sudden but I have resolved the problem by updating node-sass
to version 6.0.1
.
QUESTION
I'm using Mac M1 and I've just upgraded to Node 14.17.6LTS.
I tried to rebuild better_sqlite3 (7.4.3) using with electron builder (22.11.7) and I'm getting the following errors:
no member named 'GetContents' in 'v8::ArrayBuffer'
Any ideas how to solve this? Thanks in advance!
...
ANSWER
Answered 2021-Sep-23 at 01:15I'm using Mac M1 and I've just upgraded to Node 14.17.6LTS.
An interesting choice, given that Node 16 officially introduced M1 support.
no member named 'GetContents' in 'v8::ArrayBuffer'
See this doc. In short, GetContents
was replaced by GetBackingStore
in late 2019. Being a compatibility layer, nan adapted to this in early 2020.
So you'll probably have to ensure that the versions of all involved packages (Node, nan, electron, ...) match each other (in the sense of having been released around the same time and targeting each other).
QUESTION
I was recently trying to create a docker container and connect it with my SQLDeveloper but I started facing some strange issues. I downloaded the docker image using below pull request:
...ANSWER
Answered 2021-Sep-19 at 21:17There are two issues here:
- Oracle Database is not supported on ARM processors, only Intel. See here: https://github.com/oracle/docker-images/issues/1814
- Oracle Database Docker images are only supported with Oracle Linux 7 or Red Hat Enterprise Linux 7 as the host OS. See here: https://github.com/oracle/docker-images/tree/main/OracleDatabase/SingleInstance
Oracle Database ... is supported for Oracle Linux 7 and Red Hat Enterprise Linux (RHEL) 7. For more details please see My Oracle Support note: Oracle Support for Database Running on Docker (Doc ID 2216342.1)
The referenced My Oracle Support Doc ID goes on to say that the database binaries in their Docker image are built specifically for Oracle Linux hosts, and will also work on Red Hat. That's it.
Linux being what it is (flexible), lots of people have gotten the images to run on other flavors like Ubuntu with a bit of creativity, but only on x86 processors and even then the results are not guaranteed by Oracle: you won't be able to get support or practical advice when (and it's always when, not if in IT) things don't work as expected. You might not even be able to tell when things aren't working as they should. This is a case where creativity is not particularly rewarded; if you want it to work and get meaningful help, my advice is to use the supported hardware architecture and operating system version. Anything else is a complete gamble.
QUESTION
I have a question about the architecture of docker images.
For example, alpine:latest
provides the image for linux/arm/v8
architecture.
We can pull this image by specifying the linux/arm64
platform:
ANSWER
Answered 2022-Jan-23 at 05:13The Docker documentation has this list:
QUESTION
Ruby 2.7.4 Rails 6.1.4.1
note: in package.json
the engines
key is missing in my app
Heroku fails during build with this error
this commit is an empty commit on top of exactly a SHA that I was successful at pushing yesterday (I've checked twice now) so I suspect this is a platform problem or somehow the node-sass got deprecated or yanked yesterday?
how can I fix this?
...ANSWER
Answered 2022-Jan-06 at 18:23Heroku switched the default Node from 14 to 16 in Dec 2021 for the Ruby buildpack .
Heroku updated the heroku/ruby
buildpack Node version from Node 14 to Node 16 (see https://devcenter.heroku.com/changelog-items/2306) which is not compatible with the version of Node Sass locked in at the Webpack version you're likely using.
To fix it do these two things:
- Specify the 14.x Node version in
package.json
.
QUESTION
was looking at this V8 design doc where it has a section for Constant Pool Entries
it says
Constant pools are used to store heap objects and small integers that are referenced as constants in generated bytecode. and
... Small integers and the strong referenced oddball type’s have bytecodes to load them directly and do not go into the constant pool.
So I am confused: are small integers pooled or not?
My understanding is that it is not worth it pooling small integers if sizeof(int) < sizeof(int *)
- because it is cheaper to just copy the actual integer instead of copying the pointer that points to the integer in the constant pool. Also variables that hold integers can be optimised to be stored directly in CPU registers and skip being allocated in memory first.
Also, are they located on the V8 heap or the stack? My understanding had always been that smis are just be the immediate values allocated on the stack instead of being a pointer + an integer allocated on heap. Also if you take a heap snapshot using chrome devtool you cannot find smis in the heap snapshot - only heap number such as big integers or double like 3.14 are on the heap until I saw this article https://v8.dev/blog/pointer-compression#value-tagging-in-v8
JavaScript values in V8 are represented as objects and allocated on the V8 heap, no matter if they are objects, arrays, numbers or strings. This allows us to represent any value as a pointer to an object.
Now I am just baffled - are smis also allocated on the heap?
...ANSWER
Answered 2022-Jan-17 at 12:37V8 developer here.
are small integers pooled or not?
They are not (at least not right now). That said, this is a small implementation detail and could be done either way: it would totally be possible to use the constant pool for Smis. I suppose the decision to build special machinery for Smis (instead of reusing the general-purpose constant pool) was made because things turned out to be more efficient that way.
it is not worth it pooling small integers if
sizeof(int) < sizeof(int *)
The details are different (a Smi is not an int
, and constant pool slots are referenced by index rather than C++ pointer), but this reasoning does go in the right direction: avoiding indirections can save time and memory.
are smis also allocated on the heap?
Yes, everything is allocated on the heap. The stack is only useful for temporary (and sufficiently small) things; that's largely unrelated to the type of thing.
The "trick" of Smis is that they're not stored as separate objects: when you have an object that refers to a Smi, such as let foo = {smi: 42}
, then the value 42
can be smi-encoded and stored directly inside the "foo" object (whereas if the value was 42.5
, then the object would store a pointer to a separate "HeapNumber"). But since the object is on the heap, so is the Smi.
@DanielCruz
What I understand [...] is that constant small integers are pooled. Variable small integers are not.
Nope. Any literal that occurs in source code is "constant". Whether you use let
or const
for your variables has nothing to do with this.
QUESTION
After updating PHP 7.4 to PHP 8.1 RC5, PHP has stopped working on my machine and produces following error:
PHP Warning: PHP Startup: ^(text/|application/xhtml+xml) (offset=0): unrecognised compile-time option bit(s) in Unknown on line 0
it produces the error even when I ask for php version:
...ANSWER
Answered 2021-Nov-20 at 13:20Like @Douglas Roos said in comments,
QUESTION
- dockerfile:
ANSWER
Answered 2021-Dec-07 at 08:54It seems that you have problems with peer dependencies
, if you just set your npm to use legacy dependency logic to install your packages you will solve the problem.
Just add to your Dockerfile this setting before running npm install:
QUESTION
Please, I need your help to get the server timestamp from Firebase version 9.
I've tried to follow the same approach as for Firebase v8 : firebase.firestore.FieldValue.serverTimeStamp()
but didn't work for version 9.
Is there any way to do the same thing in Firebase version 9 ?
...ANSWER
Answered 2021-Oct-10 at 22:35It's discussed in the documentation. Just import serverTimestamp
.
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