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Truly independent web browser
a53542e0a3
It's not what the spec tells us to do. In fact, the spec tells us the
exact opposite:
9.5 Jobs and Host Operations to Enqueue Jobs
https://tc39.es/ecma262/#sec-jobs
A Job is an Abstract Closure with no parameters that initiates an
ECMAScript computation when no other ECMAScript computation is
currently in progress.
...
Their implementations must conform to the following requirements:
- ...
- The Abstract Closure must return a normal completion, implementing
its own handling of errors.
However, this turned out to not be true in all cases. More specifically,
the NewPromiseReactionJob AO returns the completion result of calling a
user-provided function (PromiseCapability's [[Resolve]] / [[Reject]]),
which may be an abrupt completion:
27.2.2.1 NewPromiseReactionJob ( reaction, argument )
https://tc39.es/ecma262/#sec-newpromisereactionjob
1. Let job be a new Job Abstract Closure with no parameters that
captures reaction and argument and performs the following steps
when called:
...
h. If handlerResult is an abrupt completion, then
i. Let status be Call(promiseCapability.[[Reject]],
undefined, « handlerResult.[[Value]] »).
i. Else,
i. Let status be Call(promiseCapability.[[Resolve]],
undefined, « handlerResult.[[Value]] »).
j. Return Completion(status).
Interestingly, this case is explicitly handled in the HTML spec's
implementation of jobs as microtasks:
8.1.5.3.3 HostEnqueuePromiseJob(job, realm)
https://html.spec.whatwg.org/webappapis.html#hostenqueuepromisejob
2. Queue a microtask on the surrounding agent's event loop to
perform the following steps:
...
5. If result is an abrupt completion, then report the exception
given by result.[[Value]].
This is precisely what all the major engines do - but not only in
browsers; the provided code snippet in the test added in this commit
works just fine in Node.js, for example.
SpiderMonkey:
https://searchfox.org/mozilla-central/rev/25997ce8267ec9e3ea4b727e0973bd9ef02bba79/js/src/builtin/Promise.cpp#6292
https://searchfox.org/mozilla-central/rev/25997ce8267ec9e3ea4b727e0973bd9ef02bba79/js/src/builtin/Promise.cpp#1277
https://searchfox.org/mozilla-central/rev/25997ce8267ec9e3ea4b727e0973bd9ef02bba79/js/src/vm/JSContext.cpp#845
JavaScriptCore:
https://trac.webkit.org/browser/webkit/trunk/Source/JavaScriptCore/builtins/PromiseOperations.js?rev=273718#L562
https://trac.webkit.org/browser/webkit/trunk/Source/JavaScriptCore/runtime/JSMicrotask.cpp?rev=273718#L94
V8:
https://source.chromium.org/chromium/chromium/src/+/main:v8/src/builtins/promise-abstract-operations.tq;l=481;drc=a760f03a6e99bf4863d8d21c5f7896a74a0a39ea
https://source.chromium.org/chromium/chromium/src/+/main:v8/src/builtins/builtins-microtask-queue-gen.cc;l=331;drc=65c9257f1777731d6d0669598f6fe6fe65fa61d3
This should probably be fixed in the ECMAScript spec to relax the rule
that Jobs may not return an abrupt completion, just like in the HTML
spec. The important bit is that those are not surfaced to user code in
any way.
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|---|---|---|
| .github | ||
| AK | ||
| Base | ||
| Documentation | ||
| Kernel | ||
| Meta | ||
| Ports | ||
| Tests | ||
| Toolchain | ||
| Userland | ||
| .clang-format | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pre-commit-config.yaml | ||
| .prettierignore | ||
| .prettierrc | ||
| azure-pipelines.yml | ||
| CMakeLists.txt | ||
| CONTRIBUTING.md | ||
| LICENSE | ||
| README.md | ||
SerenityOS
Graphical Unix-like operating system for x86 computers.
About
SerenityOS is a love letter to '90s user interfaces with a custom Unix-like core. It flatters with sincerity by stealing beautiful ideas from various other systems.
Roughly speaking, the goal is a marriage between the aesthetic of late-1990s productivity software and the power-user accessibility of late-2000s *nix. This is a system by us, for us, based on the things we like.
I (Andreas) regularly post raw hacking sessions and demos on my YouTube channel.
Sometimes I write about the system on my github.io blog.
I'm also on Patreon and GitHub Sponsors if you would like to show some support that way.
Screenshot
Kernel features
- x86 (32-bit) and x86_64 (64-bit) kernel with pre-emptive multi-threading
- Hardware protections (SMEP, SMAP, UMIP, NX, WP, TSD, ...)
- IPv4 stack with ARP, TCP, UDP and ICMP protocols
- ext2 filesystem
- POSIX signals
- Purgeable memory
- /proc filesystem
- Pseudoterminals (with /dev/pts filesystem)
- Filesystem notifications
- CPU and memory profiling
- SoundBlaster 16 driver
- VMWare/QEMU mouse integration
System services
- Launch/session daemon (SystemServer)
- Compositing window server (WindowServer)
- Text console manager (TTYServer)
- DNS client (LookupServer)
- Network protocols server (RequestServer and WebSocket)
- Software-mixing sound daemon (AudioServer)
- Desktop notifications (NotificationServer)
- HTTP server (WebServer)
- Telnet server (TelnetServer)
- DHCP client (DHCPClient)
Libraries
- C++ templates and containers (AK)
- Event loop and utilities (LibCore)
- 2D graphics library (LibGfx)
- OpenGL 1.x compatible library (LibGL)
- GUI toolkit (LibGUI)
- Cross-process communication library (LibIPC)
- HTML/CSS engine (LibWeb)
- JavaScript engine (LibJS)
- Markdown (LibMarkdown)
- Audio (LibAudio)
- Digital Signal Processing/Synthesizer Chains (LibDSP)
- PCI database (LibPCIDB)
- Terminal emulation (LibVT)
- Out-of-process network protocol I/O (LibProtocol)
- Mathematical functions (LibM)
- ELF file handling (LibELF)
- POSIX threading (LibPthread)
- Higher-level threading (LibThreading)
- Transport Layer Security (LibTLS)
- HTTP and HTTPS (LibHTTP)
- IMAP (LibIMAP)
Userland features
- Unix-like libc and userland
- Shell with pipes and I/O redirection
- On-line help system (both terminal and GUI variants)
- Web browser (Browser)
- C++ IDE (HackStudio)
- Desktop synthesizer (Piano)
- E-mail client (Mail)
- Various desktop apps & games
- Color themes
How do I read the documentation?
Man pages are available online at man.serenityos.org. These pages are generated from the Markdown source files in Base/usr/share/man and updated automatically.
When running SerenityOS you can use man for the terminal interface, or help for the GUI.
How do I build and run this?
See the SerenityOS build instructions
Before opening an issue
Please see the issue policy.
FAQ: Frequently Asked Questions
Get in touch
Join our Discord server: SerenityOS Discord
Author
- Andreas Kling - awesomekling
Contributors
- Robin Burchell - rburchell
- Conrad Pankoff - deoxxa
- Sergey Bugaev - bugaevc
- Liav A - supercomputer7
- Linus Groh - linusg
- Ali Mohammad Pur - alimpfard
- Shannon Booth - shannonbooth
- Hüseyin ASLITÜRK - asliturk
- Matthew Olsson - mattco98
- Nico Weber - nico
- Brian Gianforcaro - bgianfo
- Ben Wiederhake - BenWiederhake
- Tom - tomuta
- Paul Scharnofske - asynts
- Itamar Shenhar - itamar8910
- Luke Wilde - Lubrsi
- Brendan Coles - bcoles
- Andrew Kaster - ADKaster
- thankyouverycool - thankyouverycool
- Idan Horowitz - IdanHo
- Gunnar Beutner - gunnarbeutner
- Tim Flynn - trflynn89
- Jean-Baptiste Boric - boricj
- Stephan Unverwerth - sunverwerth
- Max Wipfli - MaxWipfli
- Daniel Bertalan - BertalanD
- Jelle Raaijmakers - GMTA
- Sam Atkins - AtkinsSJ
- Tobias Christiansen - TobyAsE
- Lenny Maiorani - ldm5180
- sin-ack - sin-ack
- Jesse Buhagiar - Quaker762
- Peter Elliott - Petelliott
- Karol Kosek - krkk
- Mustafa Quraish - mustafaquraish
- David Tuin - davidot
(And many more!) The people listed above have landed more than 100 commits in the project. :^)
License
SerenityOS is licensed under a 2-clause BSD license.