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Fix getRandomInt boundaries #1348

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Merged
elopez merged 1 commit into from
Feb 7, 2025
Merged

Fix getRandomInt boundaries #1348

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4 changes: 2 additions & 2 deletions lib/Echidna/ABI.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -186,12 +186,12 @@ getRandomUint n =

-- | Generate a random signed integer with the following distribution:
-- * 10% uniformly from the range -1023 to 1023.
-- * 90% uniformly from the range -1 * 2 ^ n to 2 ^ (n - 1).
-- * 90% uniformly from the range -1 * 2 ^ (n - 1) to 2 ^ (n - 1) - 1.
getRandomInt :: MonadRandom m => Int -> m Integer
getRandomInt n =
getRandomR =<< Random.weighted
[ ((-1023, 1023), 1)
, ((-1 * 2 ^ n, 2 ^ (n - 1)), 9)
, ((-1 * 2 ^ (n - 1), 2 ^ (n - 1) - 1), 9)
]

-- | Synthesize a random 'AbiValue' given its 'AbiType'. Doesn't use a dictionary.
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