Re: Proposing Solang Solidity Compiler

Sean Young

Hi Vipin,

I think you and I have very similar interests, my other hat is maintainer
of a small linux kernel subsystem (infrared). OS and compiler hacking is
very much my interest too!

As for the labs project, I have given this some thought. I think what would
be great is a page linked from which lists the current
labs projects with a brief description. That would be better than using
github repo listing.

As for compiler nerds, yes there are a few around. Any good computer
science degree should include compilers in their curriculum. Also, at
the moment, what would help me most is on the testing and integration side
with ledger projects.


On Wed, Feb 19, 2020 at 10:02:47AM -0500, Vipin Bharathan wrote:
Hi Sean,

I am reaching out as a lab steward. If you have suggestions to improve the
working of the labs, especially for small projects like yours; I am all
We need to make some changes based on feedback. I will bring this topic up
with the other stewards (who are no doubt following this thread).

As a lapsed OS hacker and compiler nerd, I understand your concerns about
the capabilities needed to participate in your lab.
However, these capabilities are more widespread than we can imagine. Also,
you need others, who are not compiler nerds to participate to bring the
labs into a project. Document writers, design reviewers, technical mavens,
we need participation from a wider array of folks.

Thanks again for contributing to the community.


On Wed, Feb 19, 2020 at 1:07 AM Sean Young <sean@...> wrote:

Hi Vipin,

First of all thank you for your kind words, it's appreciated.

As you point out, a single maintainer isn't ideal. I have spoken to many
people who are interested in the project. However, the set of people who
understand how compilers are built, rust, llvm, and Solidity is a small
intersection. My hope was that through being a hyperledger project,
more contributers/maintainers will present themselves.

My hope remains that through becoming a full-fledged project that it would
increase collaboration between Solang and the ledger projects, and help
write Solang target support for any ledger project that wants Solidity
support, using their flavour of webassembly (not just ewasm).

Secondly I hoped it would simply get more people using Solang.

The aim is not to be a top-level project; the aim is to be succcessful
project. However, it feels somewhat like a chicken-and-egg type problem.



On Tue, Feb 18, 2020 at 09:28:19AM -0500, Vipin Bharathan wrote:
Hi Sean,
Great to see your active involvement in developing components for
use; especially those that have such potential.
Also heartening to see is the support you are getting from grants.
Any HL project needs community support. Not just verbal support. With a
single maintainer, many of the governance kpis will not be met.
This is in spite of stated support from several people.
The main question that I have is, what is the advantage of having Solang
a full-fledged project, rather than a lab?
If the answer is publicity; let us ramp up slowly; prompting its use and
scale by inviting interested parties to collaborate and work together in
Once we demonstrate momentum in community participation, there will be
of a chance to get this adopted as a project.
It is exciting to see significant projects being launched through the lab

On Tue, Feb 18, 2020 at 8:40 AM greg.hill via Lists.Hyperledger.Org
<> wrote:

As a fellow Burrow maintainer and previous colleague, I would also
like to
sponsor Solang. I strongly believe in the vision set out by Sean and I
be excited to see it grow under the strengthened adoption of
In the coming months I intend to contribute in both my official
(Monax) and
unofficial capacity.

Gregory Hill

On Mon, Feb 17, 2020 at 8:21 PM Silas Davis via Lists.Hyperledger.Org
<> wrote:


Some may know Sean as a Burrow maintainer and former employee of
Sean now works as an independent developer, but Solang was started as
side-project while Sean was still at Monax getting to observe the
idiosyncrasies (and lack of formal grammar) of the Solidity compiler
at first-hand and knew there was a better way with modern compiler
Solang quickly became a Hyperledger Labs project and since then Sean
able to secure funding to work on solang on it to work full time. So
we were all sorry to see him go (and I was sorry to lose my lunch
date 😭)
we would be very happy to support this project at Monax -
specifically I
would like to get involved, and I suspect so would Greg Hill. I know
would welcome other interested maintainers on contributors. I think
has huge potential and to become a viable competitor to solc with the
emergence of eWASM. But I think to have the best chance Solang needs
to gain traction _now_.

If you look at the repository statistics you can see the development
velocity and effort Sean has put in already. It is also very clear to
that Solang fits the bill as a clearly delineated, cross-project,
cross-organisation (with EEA now as an associate member of
project that will be more than a nice-to-have for those wanting to
the gap between EVM and WASM, and WASM and blockchains. Sean also
spent 11
years at IBM, so he'll fit in around here ;)

In the case of the Burrow project we have merged initial support for
( and will be
working on
corollaries to this feature in our roadmap (, see also our
due this week:
can iterate rapidly on the cross-contract calls and possible
extensions to
the set of externs defined be eWASM.

I would be very happy to act as a sponsor for this proposal.


On Mon, 17 Feb 2020 at 18:13, Sean Young <sean@...> wrote:

Hello tsc,

I'd like to propose Solang to become a hyperledger project.

Solang is a compiler for the Solidity language that can target ewasm
(used by Hyperledger Burrow and others), Sawtooth Sabre, and Parity
Substrate. It is written in rust and uses LLVM as the compiler
aim is for full compatibility with the Solidity language where
assembly {} with EVM instructions are not supported in wasm context).

Solidity as a language does have its quirks, however it has
itself as a defacto language commonly for smart contract. Having
support for the Hyperledger blockchains would be a great feature,
it would be beneficial for those project to colaborate on a common

Other than Burrow, there are many other projects that allow ewasm
smart contracts. When ewasm comes to mainnet ethereum, Solang will be
ready to support it.

Possible future directions:
- the Solidity language can improve (e.g. string processing or
- create a solidity language server for IDEs
- Integer arithmetic overflow detection in Solidity
- introduce foreign function interface, making it possible to link
written in other languages using the llvm linker (e.g. new crypto
in C).
- Fabric can also run wasm chain code:
- There is an experimental evm llvm backend, so Solang could
compile to
EVM just like the Ethereum Solidity compiler.


The scope is the Solidity language and smart contacts written in
compiler and related tools like language server (for IDEs) and style
(like lint or clippy).

Other than smart contracts, there are also other areas where a wasm
language can help. For example, the BitXHub proposal needs wasm to do
chain validation.

Commit development resources
Solang is funded through a web3 foundation grant. The grant funds the
for full Solidity language support, compatible with the ethereum
solidity compiler. As part of the grant the project has committed to

Initial Maintainers
Sean Young <sean@...>

I'm not affiliated with any company or in employment; funding is
web3 foundation grant. My interests are compilers and smart
contract, not
any ledger in particular.


Sean Young

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