0xd3bu6

live solidity debugging

Debugging solidity sucks. The feedback loop is very slow. Let's make that better. This project is meant to add a read-only REPL to your Solidity code. It works by monkey-patching the EVM (ethereumjs-vm) to emit debug events and ganache-core to interpret them in a REPL.

Installation

source install.sh
cd yourdirectoryofchoice
install_0xd3bu6

How to use

Add these lines of assembly where you want to drop down into a debugger:

function setValue(uint _val) {
  // This assembly directive is the equivalent of a debug statement
  assembly {
    sstore(0xDE, 0xB6)
  }
  value = _val;
  otherValue += _val;
}

Then go ahead and debug your smart contract. This command will run a custom ganache and EVM locally and allow you to live debug your smart contract.

It will keep track of your ABI for you, and will ask you for the function you want to debug.

cd ganache-core
node debug.js path/to/contract

From there, you will get a custom read-only REPL in the console. You can use web3 and a custom abi object.

0xd3bu6( PC=176 )> help
h = help
e = eval
p = print
n = c = continue
q = quit
m = run read only contract method
Try 'web3.eth.accounts' or 'methods' or 'deployed' for your contract
0xd3bu6( PC=176 )>