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(!) BigInteger should specify range explicitly #408

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fulldecent opened this issue Aug 12, 2019 · 2 comments
Open

(!) BigInteger should specify range explicitly #408

fulldecent opened this issue Aug 12, 2019 · 2 comments

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@fulldecent
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fulldecent commented Aug 12, 2019 •
edited

BigIntegers are limited in the AVM ABI at:

https://github.com/aionnetwork/AVM/blob/master/org.aion.avm.userlib/src/org/aion/avm/userlib/abi/ABIStreamingEncoder.java#L480

a) This limitation is not specified in documentation. aionnetwork/aion-docs#64
b) The actual limits of the BigIntegers should be mentioned in code for clarity. I think it will be [-2^255, 2^255 - 1]. But the exact number is useful to document.
This was referenced Aug 12, 2019
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@fulldecent fulldecent changed the title BigInteger should specify range explicitly (!) BigInteger should specify range explicitly Aug 21, 2019
@fulldecent
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Requesting assistance @jeff-aion

@fulldecent
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Experiments done here fulldecent/aion-aip040@53b77b9

Found that BigInteger can exceed 2^255 but not when encoding to ABI.

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