Function selector is incorrect for structs

[mds1]

Hey again @tintinweb—I know in #68 you mentioned the signature extraction is hacky and you don't expect many people use it, but actually it's probably the feature I use most, so here's another related issue 😁

The issue:

• The function selector for this method is 0x9120491c
• But the extension reports 0xe1acd927

In this case the method linked is an array of structs. I think I've also seen regular structs and interfaces (e.g. function someMethod(IERC20 _address)) give the wrong function signature, though I don't have an example handy—I can double-check and confirm this if you need

[jjmr007]

I find this auditor as a very useful tool.

The problem with structs in function selector is not the only issue: it don't parse by any mean the interfaces. May be I have to open a new issue regarding this problem?

E.g.: if we use Remix in a contract with the method:

function rateByPath(IERC20[] calldata _path, uint256 _amount)

It is parsed as: "convertByPath(address[],uint256,uint256,address,address,uint256)", with the selector:

"b77d239b": "convertByPath(address[],uint256,uint256,address,address,uint256)",

But the vscode-solidity-auditor do the wrong calculation:

ded49702: "convertByPath(IERC20[],uint256,uint256,address,address,uint256)"

[fabiohild]

As another note, for fixed sized arrays the wrong function sig is shown too:

For "function arr(uint[2] memory param)" it returns "bfceb977 => arr(uint256[])"

Correct output would be "d1578977 => arr(uint256[2])"

[tintinweb]

I guess I really have to refactor the funcsig extraction part. If anyone want's to take this on, I'm open for PRs :)

[ErrorEater]

"funcSig" over a function and "funcSigs" at the top of the file report 2 different signature values for the same function. The problem arises if a function has in parameter of struct array. The "funcSig" even reports the struct array parameter as address array while the "funcSigs" reports it as struct array. Signature reporting feature is a useful feature, and I would like it to be fixed.