Cell Script

Cell Script is a newly designed language for smart-contract programming on the UTXO chain, which currently supports CKB.

Example

Here is an example of a simple cell script.

import "debug"
import "tx"
import "cell"

func main() {
    if tx.isOwnerMode() {
        return 0
    }

    in_sum, out_sum := 0, 0
    ins := tx.inputs()
    if len(ins) == int32(0) {
        return 1
    }
    for input := range tx.inputs() {
        in_sum += input
    }

    for output := range tx.outputs() {
        out_sum += output
    }

    if in_sum < out_sum {
        debug.Printf("Invalid Amount")
        return 1
    }
  
    return 0
}

The ideas and specs can be found here.

The internal discussion can be found here.

How to build (MacOS)

brew install go@1.22
brew install antlr@4
brew install openjdk@21
brew install llvm@18
brew tap riscv-software-src/riscv
brew install riscv-tools
export PATH="/opt/homebrew/bin:$PATH"
export PATH="/opt/homebrew/opt/llvm@18/bin:$PATH"
make build
source install.sh

How to build (Ubuntu)

Install golang 1.22

sudo add-apt-repository ppa:longsleep/golang-backports
sudo apt update
sudo apt install golang-go

Install antlr4, openjdk-21, clang

sudo apt install antlr4
sudo apt install openjdk-21-jdk
sudo apt install clang

Install llvm

sudo bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)"

or

sudo apt install llvm
sudo apt install lld

Install riscv-tools

sudo apt update
sudo apt upgrade
sudo apt install autoconf automake autotools-dev curl python3 python3-pip libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev libexpat-dev ninja-build git cmake libglib2.0-dev libslirp-dev

mkdir risc-v
cd risc-v
git clone https://github.com/riscv-collab/riscv-gnu-toolchain.git

cd riscv-gnu-toolchain
sudo mkdir /opt/riscv
./configure --prefix=/opt/riscv
sudo make linux

echo 'export PATH="$PATH:/opt/riscv/bin"' >> ~/.bashrc

source ~/.bashrc

or

sudo apt install gcc-riscv64-unknown-elf

How to compile cellscript program

You can write your program in file with .cell. Here for example, we say hello.cell

cell hello.cell

You will get the output file also known as elf file named hello in the root folder. Just run it ./hello!

To compile elf

cell -t riscv hello.cell

You will get the elf executable named hello in the root folder.

To run the elf file, we need ckb-debugger the default debugger for ckb programs.

Run the following command to install ckb-debugger, suppose you already know what is cargo.

cargo install --git https://github.com/nervosnetwork/ckb-standalone-debugger ckb-debugger

Run below command to debug & run the hello program.

ckb-debugger --bin hello

Use cell --help to view the usage instructions.

Usage: cell [options] <filename>
  -d, --debug           Emit debug information during compile time
  -h, --help            Show help message
  -O, --optimize        Enable clang optimization
  -o, --output string   Output binary filename
  -t, --target string   Compile to this target (default "native")
  -v, --verbose         Emit verbose command during compiling

To develop xUDT

ckb-c-stdlib use molecule 0.7.1

cargo install moleculec@0.7.1 --locked

To Deploy a CKB contract

git clone git@github.com:cell-labs/cell-cli.git
cd cell-cli
npm install
npm install -g .
# 1、Copy the cell bin file to the Cell-Cli folder: exmple: helloworld
# 2、Enter your CKB private key in cell.config.js
cell-cli deploy ./helloworld