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Which storage slots are allocated for which contract variable depends on the language and/or compiler. The Solidity compiler has an option to output the storage layout as a JSON structure:
https://solidity.readthedocs.io/en/latest/internals/layout_in_storage.html#json-output
In the Solidity language you can use .slot in assembly to get the storage slot of a ...
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The function changes execution according to signature passed
if (bytes(signatures[i]).length == 0) {
callData = data[i];
} else {
callData = abi.encodePacked(bytes4(keccak256(bytes(signatures[i]))), data[i]);
}
If it is empty it will assume the function call is contained in data[i]. You would have to use web3.eth.abi....
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