evm-cfg-builder 0.3.1

# EVM CFG BUILDER [](https://travis-ci.org/crytic/evm_cfg_builder) [](https://empireslacking.herokuapp.com) [](https://badge.fury.io/py/evm-cfg-builder)

evm-cfg-builder is used to extract a control flow graph (CFG) from EVM bytecode. It is used by Ethersplay, Manticore, and other tools from Trail of Bits. It is a reliable foundation to build program analysis tools for EVM.

We encourage contributions that address any known [issues](https://github.com/trailofbits/evm_cfg_builder/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc) and will pay out bounties for accepted PRs. Join us on the [Empire Hacking Slack](https://empireslacking.herokuapp.com) to discuss using or extending evm-cfg-builder.

## Features

• Reliably recovers a Control Flow Graph (CFG) from EVM bytecode using a dedicated Value Set Analysis

• Recovers functions names

• Recovers attributes (e.g., payable, view, pure)

• Outputs the CFG to a dot file

• Library API

## Usage

### Command line

To export basic dissassembly information, run: ` evm-cfg-builder mycontract.evm `

To export the CFG of each function (dot format), run: ` evm-cfg-builder mycontract.evm --export-dot my_dir `

dot files can be read using xdot.

### Library See [examples/explore_cfg.py](examples/explore_cfg.py) and [examples/explore_functions.py](examples/explore_functions.py) for library examples.

## How to install

### Using Pip ` $ pip install evm-cfg-builder `

### Using Git ` git clone https://github.com/trailofbits/evm_cfg_builder pip install . `

## Requirements

• Python >= 3.6

• [pyevmasm](https://github.com/trailofbits/pyevmasm)

## Getting Help

Feel free to stop by our [Slack channel](https://empireslacking.herokuapp.com) (#ethereum) for help using or extending evm-cfg-builder.

## License

evm-cfg-builder is licensed and distributed under the AGPLv3. [Contact us](mailto:opensource@trailofbits.com) if you’re looking for an exception to the terms.