web3-starter-sol/calldata

calldata

tl; dr

• calldata is the encoded parameter(s) sent on functions by smart contracts to the evm (for example, through abi.econde(),abi.econcdeWithSelector() for a particular interfaced function, or abi.encodePacked()` for efficient dynamic variables).

• selector() generates the 4-bytes representing the method in the interface: this is how the evm knows which function is being interacted.

• each piece of calldata is 32 bytes long (64 chars), where 20 hex == 32-bytes

• types:

  • static variables: the encoded representation of uint, address, bool, bytes, tuples
  • dynamics variables: non-fixed-size types: bytes, string, dynamic and fixed arrays <T>[]

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decompilers

• dedaub
• ethervm.io
• panoramix
• froundry's cast with --debug

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resources

• mev memoirs in the arena part 1, by noxx
• mev memoirs in the arena part 2, by noxx