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shazow / whatsabi

Extract the ABI (and resolve proxies, and get other metadata) from Ethereum bytecode, even without source code.
https://shazow.github.io/whatsabi/
MIT License
1.04k stars 71 forks source link

disasm: Detect output values #14

Closed shazow closed 1 year ago

shazow commented 1 year ago

Still in the research phase, trying to find a way to detect output sizes but that's looking harder than I hoped.

It looks like modern solidity wraps most outputs through a chain of jumps that prepares the data. It's going to be quite hard to do this with a single-pass static analysis.

Older solidity (e.g. WETH contract with v0.4.x) does a simpler return macro per function window, those aren't hard to detect but extracting sizing reliably still seems hard.

Issue #13

shazow commented 1 year ago

There's still some issues but it's probably good enough for an incremental release.