mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
28 lines
487 B
Python
28 lines
487 B
Python
|
from rule import Rule
|
||
|
|
from opcodes import *
|
||
|
|
|
||
|
|
"""
|
||
|
|
Shift left workaround that Solidity implements
|
||
|
|
due to a bug in Boost.
|
||
|
|
"""
|
||
|
|
|
||
|
|
rule = Rule()
|
||
|
|
|
||
|
|
n_bits = 8
|
||
|
|
bigint_bits = 16
|
||
|
|
|
||
|
|
# Input vars
|
||
|
|
X = BitVec('X', n_bits)
|
||
|
|
A = BitVec('A', n_bits)
|
||
|
|
B = BitVec('B', bigint_bits)
|
||
|
|
|
||
|
|
# Compute workaround
|
||
|
|
workaround = Int2BV(
|
||
|
|
BV2Int(
|
||
|
|
(Int2BV(BV2Int(X), bigint_bits) << Int2BV(BV2Int(A), bigint_bits)) &
|
||
|
|
Int2BV(BV2Int(Int2BV(IntVal(-1), n_bits)), bigint_bits)
|
||
|
|
), n_bits
|
||
|
|
)
|
||
|
|
|
||
|
|
rule.check(workaround, SHL(A, X))
|