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console.log
go brrr
#193
Merged
Merged
console.log
go brrr
#193
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Xenomega
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Aug 15, 2023
damilolaedwards
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Nov 16, 2023
Introduce `console.log` functionality with string formatting capabilities. --------- Co-authored-by: David Pokora <dpokora@gmail.com>
s4nsec
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Jul 9, 2024
Introduce `console.log` functionality with string formatting capabilities. --------- Co-authored-by: David Pokora <dpokora@gmail.com>
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This PR introduces
console.log
functionality for medusa. The PR must satisfy the following technical requirements:Technical Requirements
console.log
functionality (string formatting is different)console.log
should lead to no performance hits or excessive memory costsDesign
The
console
contract is now aCheatCodeContract
, aka a precompiled contract. Callingconsole.log(x)
will invoke the associated ABI method in the precompile. The method itself actually does nothing! The reason why we can do this is because our execution tracer will be able to track that the console.log precompile was called and it has access to the input arguments provided to the function. The input arguments is really all we need to handle the rest of the functionality needed by this PR.During the creation of an execution trace, medusa will specifically search for calls to
console.log
and will then attempt to parse the various inputs. The main thing that needs to happen with inputs is (a) string formatting or (b) encoding the ABI values into a string. Option (b) is trivial and was already supported. medusa will gather all the logs found in an execution trace and append it to the bottom of the trace under[Logs]
.String formatting
The
console.log
PR also supports string formatting. Note the string formatting is effectivelyfmt.Sprintf(formattedString, args)
. Since we use golang's default string formatter, we do not fully support foundry'sconsole.log
string formatting. Identifiers such as%o
or%i
do not work in golang. Thus, the associated documentation for our PR should highlight these differences.