Build v8

[litoki...@gmail.com]

Hi for a long time now i've been trying to build v8 without any success the documentation is vague and i really need to build it along all of it's parts...

Thank you 

[Leszek Swirski]

Can you be more specific about the errors you're getting? https://github.com/v8/v8/wiki/Building-from-Source is the source of truth here, if there are any issues with this documentation please let us know because we do want it to be as easy as possible.

On Tue, Aug 14, 2018 at 1:59 PM <litoki...@gmail.com> wrote:

Hi for a long time now i've been trying to build v8 without any success the documentation is vague and i really need to build it along all of it's parts...

Thank you 

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[dan Med]

I’m going to try and build it.... and will contact you thank you 

[dan Med]

but i'm trying to build it on windows not linux nor OSx

2018-08-14 16:54 GMT+02:00 dan Med <litoki...@gmail.com>:

I’m going to try and build it.... and will contact you thank you 

On Tue, 14 Aug 2018 at 15:39, 'Leszek Swirski' via v8-dev <v8-...@googlegroups.com> wrote:

Can you be more specific about the errors you're getting? https://github.com/v8/v8/wiki/Building-from-Source is the source of truth here, if there are any issues with this documentation please let us know because we do want it to be as easy as possible.

On Tue, Aug 14, 2018 at 1:59 PM <litoki...@gmail.com> wrote:

Hi for a long time now i've been trying to build v8 without any success the documentation is vague and i really need to build it along all of it's parts...

Thank you 

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[dan Med]

I'm on a windows based machine, would this be good ? https://github.com/v8/v8/wiki/Building-with-GN

if yes

        i already tried it but with no success

else

        i don't know what to  do 

[Leszek Swirski]

Did you follow https://github.com/v8/v8/wiki/Building-from-Source and use depot-tools + "fetch v8"?

If yes, then please post what your actual error message is

else, do that first.

On Tue, Aug 14, 2018 at 5:15 PM dan Med <litoki...@gmail.com> wrote:

I'm on a windows based machine, would this be good ? https://github.com/v8/v8/wiki/Building-with-GN

if yes

        i already tried it but with no success

else

        i don't know what to  do 

2018-08-14 17:16 GMT+02:00 dan Med <litoki...@gmail.com>:

but i'm trying to build it on windows not linux nor OSx

2018-08-14 16:54 GMT+02:00 dan Med <litoki...@gmail.com>:

I’m going to try and build it.... and will contact you thank you 

On Tue, 14 Aug 2018 at 15:39, 'Leszek Swirski' via v8-dev <v8-...@googlegroups.com> wrote:

Can you be more specific about the errors you're getting? https://github.com/v8/v8/wiki/Building-from-Source is the source of truth here, if there are any issues with this documentation please let us know because we do want it to be as easy as possible.

On Tue, Aug 14, 2018 at 1:59 PM <litoki...@gmail.com> wrote:

Hi for a long time now i've been trying to build v8 without any success the documentation is vague and i really need to build it along all of it's parts...

Thank you 

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[dan Med]

but isn't the link u just gave to me wrong ???  cause at the top i read 

In order to be able to build V8 from scratch on Linux/Mac for x64 please heed the following steps:

but i'm on a windows 

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[Leszek Swirski]

The parts about depot tools and "Don’t simply git clone the V8 repository!" are still relevant.

Windows builds are admittedly less well documented than Linux/Mac builds, we should clarify the docs there.

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[dan Med]

Yeah ! ok so what i have so far is the depot tools already set up and i already have git on my computer.

Before going with your path, i should say that yesterday i gave it a shot and after the fetch v8 command run for a while it asked mefor a username input for a google.something email i've already cleared everything up because i thought i should start from zero and here u are so.

I will do fetch v8 now ? 

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[Leszek Swirski]

Try it again, make sure you go through all the gclient steps (calling gclient before fetch, calling gclient sync after fetch), follow the remaining steps on that page and see what happens.

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[dan Med]

yeah but stil 1 that isn't the page for windows

second after fetch i will get one error for sure now i will try again

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[dan Med]

OK so after the fetch v8 command this happened 

subprocess.CalledProcessError: Command '('C:\\depot_tools\\win_tools-2_7_6_bin\\python\\bin\\python.exe', 'C:\\depot_tools\\gclient.py', 'sync', '--with_branch_heads')' returned non-zero exit status 2

[dan Med]

it is really frustrating

[thapari...@gmail.com]

Run into same error. Steps followed to correct:

1. Delete depot_tools
2. Environment variables:
set DEPOT_TOOLS_WIN_TOOLCHAIN=0
set DEPOT_TOOLS_UPDATE=0
3. Install depot_tools again and follow to 'fetch v8'

it is really frustrating

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[Jakob Kummerow]

set DEPOT_TOOLS_WIN_TOOLCHAIN=0 sounds like it might be missing from our documentation.

set DEPOT_TOOLS_UPDATE=0 sounds like you're setting yourself up for future trouble.

[danny...@gmail.com]

For what it's worth, I spent several days a month or two ago trying to get V8 to build on Windows and eventually gave up (I was hoping to step through the source to work something out).

Your Windows documentation definitely could do with someone actually trying it from scratch on a clean machine, and documenting exactly what they did without any jargon/acronyms. The existing documentation gives the impression that it is a Linux-script with a few comments added for Windows by people "guessing" what they think they might have "tweaked" on their PC to make it work.

Things like this step:

   5. tools/dev/v8gen.py x64.release

tells me that you are assuming that I am a python developer and have set up the file associations accordingly. I am not, so Windows merely prompts me to ask how I want to open the file "tools\dev\v8gen.py".

I do have several instances of python.exe on my machine (one of them is yours). Do you want me to run the python.bat file, here? The contents of that file look a bit weird to me. It looks like it's trying to find a file called "%~dp0python_bin_reldir.txt" (yes, there's only one '%' in there). This, with my admittedly limited understanding of Windows batch command syntax, seems to be gibberish. Who is ~dp0? That's a Unix home folder, not a Windows one, surely?

I'll stop there; hopefully you get the point that you need to write some Windows documentation. Please don't try to "improve" what you have, just get someone who understands Windows and has a clean machine to write one from scratch!

Thanks :)

Dan

[Mike Moening]

Well said Dan!

It’s a mess.

 

Mike M

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[dan Med]

Yeah that’s what i was trying to say 

[Jakob Kummerow]

We are aware that our Windows instructions are not as well-maintained as those for Linux/Mac. As far as I know, nobody on the team uses Windows for development regularly. An additional difficulty is that we share a lot of our infrastructure with the rest of the Chromium project, so sometimes when they change shared things our documentation lags behind until someone notices (e.g. the DEPOT_TOOLS_WIN_TOOLCHAIN thing is such a case, it is documented here: https://chromium.googlesource.com/chromium/src/+/master/docs/windows_build_instructions.md#install but not yet on the V8 wiki).

If any one of you from the community who wants to develop V8 on Windows would volunteer to contribute and maintain well-tested instructions, that would certainly be appreciated by the rest of the community :-)

[dan Med]

I’m looking not to develop for v8 but just to build it... have some things to test on it

[Dan Pike]

I think that would be rather difficult, since such a person would need some level of control over the project, including access to those people who know how to do it in the first place. Which is a self-referencing problem, is it not? :)

 

May I ask why you choose to depend on obfuscating custom tools such as depot_tools and those python scripts? If you were to use more standard stuff, like CMake and plain-old-git commands (or even MSBuild), then it might be feasible for us to work out what is going wrong and give you some advice.

 

What is so special about a Windows build of V8 that it cannot be built with a “normal” project/solution file? Although the GUI side of Visual Studio drives me crazy with some of its weird behaviour, it is a very powerful build environment and the Microsoft compiler continues to be pretty stable and well-documented.

 

Dan

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[Jakob Kummerow]

On Thu, Aug 16, 2018 at 7:48 AM Dan Pike <danny...@gmail.com> wrote:

I think that would be rather difficult, since such a person would need some level of control over the project, including access to those people who know how to do it in the first place. Which is a self-referencing problem, is it not? :)

My suggestion was to become those people (as opposed to assuming that they already exist).

 

May I ask why you choose to depend on obfuscating custom tools such as depot_tools and those python scripts? If you were to use more standard stuff, like CMake and plain-old-git commands (or even MSBuild), then it might be feasible for us to work out what is going wrong and give you some advice.

Because we want to support our project's needs in a way that's as convenient and as fast as possible. We have requirements (e.g.: pulling in third-party dependencies at specified versions, multiple supported platforms, cross-compilation, a massive codebase with many build-time configuration options) that are somewhat cumbersome to handle with "plain old" commands. Convenience wrappers and sane defaults are the solution. And our build is very convenient; it just so happens to be not as well tested on Windows because so few people use Windows for development. But that's where you can help, if you're interested!

What is so special about a Windows build of V8 that it cannot be built with a “normal” project/solution file? Although the GUI side of Visual Studio drives me crazy with some of its weird behaviour, it is a very powerful build environment and the Microsoft compiler continues to be pretty stable and well-documented.

To the extent possible, we want the build system to be the same on all platforms. The more divergence there is, the more effort has to be spent on the build system, and the more platform-specific issues will creep in.

If V8 were Windows-only, we would probably just use Visual Studio project files as build configuration; and in fact, as far as I know that was the case in Chrome's very early days in 2008. But these days we also officially support Linux, MacOS, ChromeOS, and Android, and various folks have a strong interest in building for various other operating systems as well (which is not officially supported but can be made to work).

[Dan Pike]

I am very interested in helping you sort out the Windows builds, and I do appreciate that you have to support many operating systems. However, I am worried that I don’t understand what is going on inside those black boxes (“gclient”, “ninja” etc).

 

Many other cross-platform projects seem to be happy to work with using cmake-based build environments along with detailed descriptions of the dependencies. In my (admittedly somewhat limited) experience, trying to maintain custom tools that people don’t understand often leads to more problems than it solves, unless you are able to put in a lot of effort to make them cope with all the ways that people work. For everything else, I prefer to KISS and spend all of that effort on good documentation, instead.

 

So, back to the underlying issue…

 

With your detailed understanding of the internals of the depot tools, can you explain what they are doing that you can’t do with “git –recursive” and “cmake”?

 

Do you also understand why, on my machine, ninja appears to build everything, all the tests pass and d8 works but it:

 

1. produces two libraries (v8_libplatform.lib and v8_libbase.lib) that Microsoft Visual Studio tells me are corrupt, and
2. doesn’t produce a v8.dll at all, as far as I can tell

?

 

I’d also love to be able to experiment with different compiler settings, e.g. whether to use static or dynamic runtime. How do I do that with v8gen?

 

Dan

 

[Jakob Gruber]

On Thu, Aug 16, 2018 at 12:01 PM, Dan Pike <danny...@gmail.com> wrote:

I am very interested in helping you sort out the Windows builds, and I do appreciate that you have to support many operating systems. However, I am worried that I don’t understand what is going on inside those black boxes (“gclient”, “ninja” etc).

 

Many other cross-platform projects seem to be happy to work with using cmake-based build environments along with detailed descriptions of the dependencies. In my (admittedly somewhat limited) experience, trying to maintain custom tools that people don’t understand often leads to more problems than it solves, unless you are able to put in a lot of effort to make them cope with all the ways that people work. For everything else, I prefer to KISS and spend all of that effort on good documentation, instead.

 

So, back to the underlying issue…

 

With your detailed understanding of the internals of the depot tools, can you explain what they are doing that you can’t do with “git –recursive” and “cmake”?

 

Do you also understand why, on my machine, ninja appears to build everything, all the tests pass and d8 works but it:

 

1. produces two libraries (v8_libplatform.lib and v8_libbase.lib) that Microsoft Visual Studio tells me are corrupt, and
2. doesn’t produce a v8.dll at all, as far as I can tell

See https://crbug.com/v8/8017. It sounds like you may be missing 'is_clang = false' for VS-compatible libraries.

 

?

 

I’d also love to be able to experiment with different compiler settings, e.g. whether to use static or dynamic runtime. How do I do that with v8gen?

GN flags are documented, run `gn args out/debug --list`. You'll find the options for static builds there.

 

 

Dan

 

[Jakob Kummerow]

On Thu, Aug 16, 2018 at 12:01 PM Dan Pike <danny...@gmail.com> wrote:

I am very interested in helping you sort out the Windows builds

Cool!

 

, and I do appreciate that you have to support many operating systems. However, I am worried that I don’t understand what is going on inside those black boxes (“gclient”, “ninja” etc).

I hope that you won't need to understand their internals. They generally do work on Windows, and how to get them to work should mostly be documented somewhere (e.g. in the Chromium docs I've linked to before), so it mostly comes down to ensuring that the V8-specific documentation is up to date.

There's also "gclient help", and https://ninja-build.org/manual.html. 

 

Many other cross-platform projects seem to be happy to work with using cmake-based build environments along with detailed descriptions of the dependencies. In my (admittedly somewhat limited) experience, trying to maintain custom tools that people don’t understand often leads to more problems than it solves, unless you are able to put in a lot of effort to make them cope with all the ways that people work. For everything else, I prefer to KISS and spend all of that effort on good documentation, instead.

 

So, back to the underlying issue…

 

With your detailed understanding of the internals of the depot tools, can you explain what they are doing that you can’t do with “git –recursive” and “cmake”?

I don't have a detailed understanding of the internals of depot_tools, I just use them.

I trust the people who chose our tools to have carefully evaluated all options, and to have had good reasons for their decisions. Most technical decisions are tradeoffs where every option has pros and cons.

I do have some high-level idea about what problems our tools are solving. One big concern is speed, because it impacts developer productivity and morale. Chromium (and V8) used to use GYP to generate project files, which was replaced by GN mostly for speed reasons. Back then, someone actually measured cmake's speed for generating .ninja files for Chromium:

GN: 2 seconds (nowadays; back then it wasn't far enough along yet)

GYP: 51 seconds (in late 2013, would probably take longer today since the project has grown)

CMake: 2:24 minutes

Why ninja? Speed. See here and here. For some other benefits, see also here.

Why gclient? Well, we already used it before we switched to git. I believe that migrating to git submodules has been investigated at some point, but I don't know what the status of that is.

 Do you also understand why, on my machine, ninja appears to build everything, all the tests pass and d8 works but it:

 

1. produces two libraries (v8_libplatform.lib and v8_libbase.lib) that Microsoft Visual Studio tells me are corrupt, and
2. doesn’t produce a v8.dll at all, as far as I can tell

Do you have "is_component_build = true" in your args.gn? Run "gn args out/<your_directory>" to check/edit. For release builds, static linking is the default, so no .dll will be created.

 

?

 

I’d also love to be able to experiment with different compiler settings, e.g. whether to use static or dynamic runtime. How do I do that with v8gen?

 

Dan

 

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[danny...@gmail.com]

Thank you to both Jakobs!

I shall take another look at it this weekend (when the pay-meter stops ticking).

Dan

[thapari...@gmail.com]

Used following configuration (few of these are repeating, kept it that way, just to not miss anything):

use_custom_libcxx_for_host = false

treat_warnings_as_errors = false

v8_enable_i18n_support = false

v8_enable_slow_dchecks = false

is_component_build = false

use_custom_libcxx = false

v8_static_library = true

v8_target_cpu = "x64"

target_cpu = "x64"

is_debug = false

is_clang = false

and targeted build for V8 and the resultant libraries are healthy and likable by VS2017.

command to target build for V8: ninja -C out.gn\x64.release V8

[danny...@gmail.com]

That looks good. Just as a quick test, I ran with the following:

gn gen out.gn/ia32.debug --enable_iterator_debugging=false --is_clang=false --is_debug=true --v8_static_library=true --is_win_fastlink=true --msvc_use_absolute_paths --symbol_level=2 --target_cpu=x86 --v8_enable_debugging_features=true --v8_enable_fast_mksnapshot=true --v8_enable_future=true --v8_enable_v8_checks=true

and it appears to have built a bunch of libraries that are, at least, of a size that I would expect. No time to try it out, yet, though :)

Dan

[dan Med]

So what do you guys suggest me to do now ? How do I build it from the beginning 

[dan Med]

Btw i was looking at the v8 github repository but i couldn't find anything interesting such as low c++ implementation, mem allocators, compilers, javascript rappresentation in c++ .... where's all the good stuff ?

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[dan Med]

is anyone online, seems like i've wasted an entire month

[dan Med]

can someone help me build this v8  as i already said "

Btw i was looking at the v8 github repository but i couldn't find anything interesting such as low c++ implementation, mem allocators, compilers, javascript rappresentation in c++ .... where's all the good stuff ? "

[dan Med]

Is anyone online atm ?

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[dan Med]

So no one is going to help me ?

[Dan Pike]

Spamming the group at the weekend probably isn’t going to help you very much. If you can wait for a short while, I am writing a wizard that will wrap all of the commands that you need to type including sorting out paths and stuff. I hope this will either solve your problem, or help us work out what is wrong with what you are doing.

 

But, it’s Sunday morning and I need to cook lunch.

 

Dan

 

[dan Med]

Hahaha yeah I forgot sorry, really thankful ! 

I’d you could include perhaps how to navigate through the v8 repo cause I still didn’t find quite a lot of things O.o

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[Dan Pike]

I’m sorry but I’m new to this, too. Which is another reason why I’m writing my own wrapper I want to mess about with the options and see what they all do.

Dan

[dan Med]

Ah ok ! 

On Sun, 19 Aug 2018 at 11:55, Dan Pike <danny...@gmail.com> wrote:

I’m sorry but I’m new to this, too. Which is another reason why I’m writing my own wrapper I want to mess about with the options and see what they all do.

Dan

--

[danny...@gmail.com]

I have uploaded a .Net 4.5 application that I wrote over the weekend to configure and build V8. It's available here: V8Builder.

In the README are TL;DR-style instructions if you don't want to use the GUI (or can't build it and don't have a friend with a C# compiler).

I gave up trying to write simple instructions, it was much easier to write an application instead.

Hope it helps,

Dan

[dan Med]

macro TO_UINT32(arg) = (arg >>> 0); found in the */*/src/macros.py

can't figure out what it does

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[dan Med]

Yes i will use it 

2018-08-20 15:57 GMT+02:00 <danny...@gmail.com>:

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[dan Med]

How do these function get called 

%GetArrayKeys

cause i can't seem to find them in the /src/array.js

as well as  %_IsSmi in the same file

[Leszek Swirski]

Hi dan,

Glad to hear things are working for you. The functions you're looking at are intrinsic/runtime functions, and that syntax is the "natives" syntax, enabled for user code with the "--allow-natives-syntax" flag. Some people have used this in the past to e.g. track optimisation behaviour, like this (no longer in-date) documentation from bluebird.

Those functions are found in C++, not in Javascript, as they are runtime calls. They are declared in src/runtime/runtime.h, where you can also find the documentation of the %Foo and %_Foo syntax. The definitions are in the .cc files under src/runtime, prefixed with "Runtime_" -- e.g. %GetArrayKeys is defined in runtime-array.cc (btw, https://cs.chromium.org/ is a great way of browsing the code). Similarly you can find the C++ definition of %IsSmi by searching for Runtime_IsSmi.

%_IsSmi, with the underscore, is an inlined intrinsic (specifically, an intrinsic that *can* be inlined by the compiler). In the interpreter, for example, this is in the supported intrinsics list, so we output an InvokeIntrinsic bytecode rather than a runtime call bytecode, which has an generated assembly handler which, during execution, dispatches on the intrinsic's id and for IsSmi does the Smi check. The optimizing compiler has similar logic.

Hope that helps -- V8 is a complex codebase due to the interplay between C++, javascript, generated assembly, etc., so don't expect to be able to easily find where everything is defined or how everything works without serious digging.

- Leszek

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[dan Med]

Yeah thank you ! i'm going to dig it all !

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[dan Med]

When chromium OS on a chromebook boots up, which directory is the first to be invoked and then executed

[dan Med]

When chromium OS on a chromebook boots up, which directory is the first to be invoked and then executed

[dan Med]

The documentation about chromium OS is vage 

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[te...@chromium.org]

I updated the build steps on https://github.com/v8/v8/wiki/Building-from-Source to include instructions for Windows.

This worked for me on a fresh Windows 10 machine. Please let me know if the instructions don't work for you.

- Tobias

[dan Med]

Ok 

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