SolMet

SolMet is a static analysis based metric calculator tool for Solidity smart contract programs. Currently, it supports the following metrics:

• SLOC - number of source code lines
• LLOC - number of logical code lines (lines without empty and comment lines)
• CLOC - number of comment lines
• NF - number of functions
• McCC - McCabe's cyclomatic complexity
• WMC - weighted sum of McCabe's style complexity over the functions of a contract
• NL - the deepest nesting level of control structures in functions summed for a contract
• NLE - nesting level else-if
• NUMPAR -number of parameters
• NOS - number of statements
• DIT - depth of inheritance tree
• NOA - number of ancestors
• NOD - number of descendants
• CBO - coupling between object classes
• NA - number of attributes (i.e. states)
• NOI - number of outgoing invocations (i.e. fan-out)

Building the tool

You can build the tool with Maven to get an executable jar file:

mvn package

Using the tool

Usage is very simple, the built jar is executable. It requires two parameters:

1. a Solidity file or a folder containing Solidity files
2. an output csv file path.

java -jar solmet-0.1.jar [input(s)] [output]

Publications

Hegedűs P., "Towards Analyzing the Complexity Landscape of Solidity Based Ethereum Smart Contracts", ACM/IEEE 1st International Workshop on Emerging Trends in Software Engineering for Blockchain, 2018 [PDF]

Output

The output is a comma separated file containing the values of the calculated metrics for each analyzed contracts/libraries/interfaces.

Credits

The parser is based on the excellent antlr4 grammar available at https://github.com/solidityj/solidity-antlr4.