1. Introduction
SOLL is a new compiler for generating Ewasm (Ethereum flavored WebAssembly) files from Solidity and Yul.
To support developers as many as possible, we design projects to not only support more smart contract programming languages, such as Rust and C++ but also support various VMs, such as Ewasm VM and evm. To achieve this goal, in the very first step, we develop SOLL, a compiler for Solidity-based smart contracts running on Ewasm VM.
For application users, please refer to this document. You will know how to use SOLL to generate Ewasm bytecode from your Solidity smart contract or Yul language, and then deploy the Ewasm bytecode to Ethereum Ewasm TestNet.
For developers, we provide another document for explaining the design of SOLL and how to develop and test the functionality of SOLL, please refer to the Developer Guide for more details.
2. Current Status and Limitations
SOLL is still in an early stage, and we’ve not fully supported Solidity and Yul. Please check the features we’ve done and limitations in the following documents.
And SOLL integrates Solidity and Yul test contracts from ethereum/solidity.
Here is the pass rate of both language:
The solidity test suite (Total 80 tests from compilation tests):
Expected Passes : 27 # Solidity has 80 testing contract, and SOLL can pass 27.
Unsupported Tests : 53 # Unimplemented by SOLL
Pass Rate: 34%
Yul test suite (Total 499 tests from libyul):
Expected Passes : 393 # libyul has 499 testing contracts, and SOLL can pass 393.
Unsupported Tests : 106 # Unimplemented by SOLL
Pass Rate: 79%
3. Getting Started
To get started with our demonstration, you will need to prepare two components at first.
We provide an image include build and execute environment (recommend).
If you don’t want to use docker directly you will need below tools (cmake, llvm, binaryen, xxd, wabt, node.js).
-
SOLL https://github.com/second-state/soll
-
If you want to set up the working environment by yourself, please install the following dependencies:
- Our docker image is based on Ubuntu 20.04
- llvm-10-dev
- llvm-10-tools
- liblld-10-dev
- cmake
- make
- wget
- python-psutil
- binaryen
- wabt
- clang-10 or g+±9
-
After SOLL 0.1.1, we use llvm-10 instead of llvm-8, if you want to build the older version of SOLL, please use this docker image: secondstate/soll:0.1.0.
3.1 Preparation
- Pull official docker image to get an already established build/execute environment.
> docker pull secondstate/soll
- Get Source Code from Github and checkout to the latest version, 0.1.1.
> git clone --recursive https://github.com/second-state/soll.git
> cd soll
> git checkout 0.1.1
3.2 Launch Environment
Attach shell to container and bind volume with repositories’ path.
> docker run -it --rm \
-v $(pwd)/soll:/root/soll \
secondstate/soll
3.3 Build SOLL
Build SOLL(we use cmake with llvm library)
(docker) $ cd ~/soll && mkdir -p build && cd build
(docker) $ cmake .. && make
3.4 Tutorial: Compile ERC20 contracts and deploy them on Ewasm testnet
Our original tutorial will deploy Ewasm bytecode on the official TestNet.
Unfortunately, the Ewasm TestNet is unavailable now.
We’ve moved the original tutorial into Deploy an ERC20 smart contract to Ewasm official TestNet.
For demonstration propose, we provide another Ewasm TestNet which is launched by our DevChain.
DevChain
The Second State DevChain features a powerful and easy-to-use virtual machine that can quickly get you started with smart contracts and DApp development. Our devchain supports Ewasm by hera through EVMC interface.
3.4.1 Compile an ERC20 smart contract
SOLL supports two frontend languages including Solidity and Yul. You can use SOLL to generate Ewasm bytecode(.wasm) directly.
3.4.1-1 For Solidity contracts
Create your smart contract files by copying from our demonstration contract “0-0-3.sol”.
And execute SOLL to generate Ewasm bytecode(.wasm) and contract ABI.
(docker) $ cd ~
(docker) $ cp ~/soll/docs/examples/0-0-3.sol ~/0-0-3.sol
(docker) $ ~/soll/build/tools/soll/soll 0-0-3.sol
# The output bytecode is loacted at ~/0-0-3.wasm
# You will need ABI information for interacting with smart contract
(docker) $ ~/soll/build/tools/soll/soll --action=EmitABI 0-0-3.sol
[{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"constant":true,"inputs":[{"name":"account","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"}]
We will use “0-0-3.wasm” in the next section to deploy it to Ewasm TestNet.
3.4.1-2 For Yul contracts
Create your smart contract files by copying from our demonstration contract “0-0-6.yul”.
And execute SOLL to generate Ewasm bytecode(.wasm) and contract ABI.
(docker) $ cd ~
(docker) $ cp ~/soll/docs/examples/0-0-6.yul ~/0-0-6.yul
(docker) $ ~/soll/build/tools/soll/soll -lang=Yul 0-0-6.yul
# The output bytecode is loacted at ~/0-0-6.wasm
# 0-0-6.yul is compiled from 0.0.3.sol via Solc. You can retrieve ABI of 0-0-6.yul by the following command:
(docker) $ ~/soll/build/tools/soll/soll --action=EmitABI 0-0-3.sol
[{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"constant":true,"inputs":[{"name":"account","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"}]
We will use “0-0-6.wasm” in the next section to deploy it to Ewasm TestNet.
3.4.2 Convert Ewasm bytecodes into text format.
3.4.2-1 Solidity Part: 0-0-3.sol
(soll docker) $ xxd -p ~/soll/docs/examples/0-0-3.wasm | tr -d $'\n'
The result should be the same as the following content. (This will be used later)
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3.4.2-2 Yul Part: 0-0-6.yul
(soll docker) $ xxd -p ~/soll/docs/examples/0-0-6.wasm | tr -d $'\n'
The result should be the same as the following content. (This will be used later)
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Then exit SOLL container goto next step.
3.4.3 Attach to our Ewasm DevChain
- Pull our devchain docker image.
> docker pull secondstate/devchain:devchain
> docker run -it secondstate/devchain:devchain attach https://rpc.parastate.io:8545
Welcome to the Travis JavaScript console!
instance: vm/v1.9.2/linux-amd64/go1.10.3
coinbase: 0x7eff122b94897ea5b0e2a9abf47b86337fafebdc
at block: 1115129 (Tue, 07 Apr 2020 06:51:46 UTC)
modules: cmt:1.0 eth:1.0 net:1.0 personal:1.0 rpc:1.0 web3:1.0
- Unlock the demo account with a long expiration time.
> personal.unlockAccount(cmt.accounts[0], '1234', 9999999)
Please note: You can obtain network tokens (STATE tokens) for the aforementioned ParaState Testnet by visiting the testnet’s faucet at https://testnet.faucet.parastate.io:8001/faucet.
There is also a YouTube Video which demonstrates how to use the faucet.
3.4.4 Deploy and execute Ewasm
3.4.4-1 Solidity: 0-0-3.wasm
- Deploy Ewasm bytecode generated from 0-0-3.sol that has been seen before.
> var bytecode = "0x...";
> var fromAccount = personal.listAccounts[0];
> var abi = [{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"constant":true,"inputs":[{"name":"account","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"}]
> var contract = cmt.contract(abi);
> var contractAddress = "0x";
> var txhash = "0x";
> var params = {
from: fromAccount,
data: bytecode,
gas: 5000000
};
> contract.new(params,
function(error, result){
if(error) {
console.log("Deploy failed");
} else {
if (result.address) {
contractAddress = result.address;
console.log("Contract Address: " + contractAddress);
} else {
txhash = result.transactionHash;
console.log("txhash: " + txhash);
}
}
});
txhash: 0x37da6061b71f8cfae71ed8e5f020b54ad805d457be4f4530b36298d6b6ad0c56
{
abi: [{
inputs: [],
payable: false,
stateMutability: "nonpayable",
type: "constructor"
}, {
payable: true,
stateMutability: "payable",
type: "fallback"
}, {
constant: true,
inputs: [{...}],
name: "balanceOf",
outputs: [{...}],
payable: false,
stateMutability: "view",
type: "function"
}, {
constant: false,
inputs: [{...}, {...}],
name: "transfer",
outputs: [{...}],
payable: false,
stateMutability: "nonpayable",
type: "function"
}, {
anonymous: false,
inputs: [{...}, {...}, {...}],
name: "Transfer",
type: "event"
}],
address: undefined,
transactionHash: "0x37da6061b71f8cfae71ed8e5f020b54ad805d457be4f4530b36298d6b6ad0c56"
}
Contract Address: 0xb606a9622b2dd1fbca5b0eece5c454260e3adaf7
- Check the transaction receipt of contract deployment.
> cmt.getTransactionReceipt(txhash)
{
blockHash: "0xcfea68349c8d30261256130769eb46fdd927391a1f989c86900fc4085319018a",
blockNumber: 1115248,
contractAddress: "0xb606a9622b2dd1fbca5b0eece5c454260e3adaf7",
cumulativeGasUsed: 1519352,
from: "0x7eff122b94897ea5b0e2a9abf47b86337fafebdc",
gasUsed: 1519352,
logs: [],
logsBloom: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
status: "0x1",
to: null,
transactionHash: "0x37da6061b71f8cfae71ed8e5f020b54ad805d457be4f4530b36298d6b6ad0c56",
transactionIndex: 0
}
- You can check the contract deployed was success by getCode(contract address)
> cmt.getCode(contractAddress)
"0x0061736d01000000..." (omitted, runtime Ewasm bytecode)
-
Send the transaction to execute a contract function transfer. In this example, we want to transfer 123 tokens from account A to account B
-
Setup transaction parameters:
> var contractInstance = contract.at(contractAddress);
> var txnObject = {
from: fromAccount,
gas: 5000000
};
> var toAccount = personal.listAccounts[1];
> var sendValue = 123
- Before we send the transaction, checking their balances first.
> contractInstance.balanceOf.call(fromAccount);
100000000
> contractInstance.balanceOf.call(toAccount);
0
- Call ERC20.transfer(receiver, value)
> contractInstance.transfer.sendTransaction(toAccount, sendValue, txnObject,
function(error, result){
if(error){
console.log("Error: " + error);
} else {
txhash = result;
console.log("txhash: " + txhash);
}
});
txhash: 0x566211fa5850ad759c001941eec060f48e0108eac06bbbeb17ad08684cf6c9d9
- Check their balances again.
> contractInstance.balanceOf.call(fromAccount);
99999877
> contractInstance.balanceOf.call(toAccount);
123
- Verfiy
transfer by getTransactionReceipt.
> cmt.getTransactionReceipt(txhash)
{
blockHash: "0x8e4e1f7bd15ec484f4e161b97be4b2de08072a4cdca0f617ec7023de9c878e6c",
blockNumber: 1116022,
contractAddress: null,
cumulativeGasUsed: 38225,
from: "0x7eff122b94897ea5b0e2a9abf47b86337fafebdc",
gasUsed: 38225,
logs: [{
address: "0xb606a9622b2dd1fbca5b0eece5c454260e3adaf7",
blockHash: "0x8e4e1f7bd15ec484f4e161b97be4b2de08072a4cdca0f617ec7023de9c878e6c",
blockNumber: 1116022,
data: "0x000000000000000000000000000000000000000000000000000000000000007b",
logIndex: 0,
removed: false,
topics: ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef", "0x0000000000000000000000007eff122b94897ea5b0e2a9abf47b86337fafebdc", "0x00000000000000000000000077beb894fc9b0ed41231e51f128a347043960a9d"],
transactionHash: "0x566211fa5850ad759c001941eec060f48e0108eac06bbbeb17ad08684cf6c9d9",
transactionIndex: 0
}],
logsBloom: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000010000000000000000000000100000000010000000000000000000000800000000000000001000000000000080000000000000000000000000000000000000000000001000000000000000000000000000000000000000000002400000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000000000",
status: "0x1",
to: "0xb606a9622b2dd1fbca5b0eece5c454260e3adaf7",
transactionHash: "0x566211fa5850ad759c001941eec060f48e0108eac06bbbeb17ad08684cf6c9d9",
transactionIndex: 0
}
3.4.4-2 Yul: 0-0-6.wasm
All steps are the same with 3.4.4-1.
You only need to replace the Ewasm bytecode with 0-0-6.wasm.
(Omitted)
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