feat: add support for custom storage layouts #192
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Fix #82 and #148
Add
--custom-storage-layoutoption that allows for custom storage layouts.The idea is to use a simple injective function to implement hash semantics that are collision-free (but not secure). This function simply left-shifts the input by 257 bits, where 256 bits ensure enough logical domain space, and the additional 1 bit is used for disambiguation (e.g., differentiating between
mapping (uint => uint)anduint[][]). Note that the output of this function is simple enough for the solver to easily reason about the non-aliasing between different storage variables.