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https://github.com/ethereum/solidity
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41 lines
942 B
Python
41 lines
942 B
Python
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from opcodes import AND
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from rule import Rule
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from util import BVUnsignedCleanupFunction, BVUnsignedUpCast
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from z3 import BitVec, BitVecVal, Concat
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"""
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Overflow checked unsigned integer multiplication.
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"""
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n_bits = 256
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# Check that YulUtilFunction::cleanupFunction cleanup matches BVUnsignedCleanupFunction
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for type_bits in range(8,256,8):
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rule = Rule()
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# Input vars
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X = BitVec('X', n_bits)
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mask = BitVecVal((1 << type_bits) - 1, n_bits)
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cleaned_reference = BVUnsignedCleanupFunction(X, type_bits)
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cleaned = AND(X, mask)
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rule.check(cleaned, cleaned_reference)
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# Check that BVUnsignedCleanupFunction properly cleans up values.
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for type_bits in range(8,256,8):
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rule = Rule()
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# Input vars
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X_short = BitVec('X', type_bits)
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dirt = BitVec('dirt', n_bits - type_bits)
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X = BVUnsignedUpCast(X_short, n_bits)
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X_dirty = Concat(dirt, X_short)
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X_cleaned = BVUnsignedCleanupFunction(X_dirty, type_bits)
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rule.check(X, X_cleaned)
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