def test_mul_overflow0(self):
arguments = [1 << 249, self.state.new_symbolic_value(256)]
self.state.constrain(operators.ULT(arguments[1], 256))
cond = self.io._unsigned_mul_overflow(self.state, *arguments)
check = self.state.can_be_true(cond)
self.assertTrue(check)
def test_mul_overflow0(self):
arguments = [2 << (8 * 31), self.state.new_symbolic_value(256)]
self.state.constrain(operators.ULT(arguments[1], 256))
result = arguments[0] * arguments[1]
check = self.io._can_mul_overflow(self.state, result, *arguments)
self.assertTrue(check)
def test_mul_no_overflow(self):
"""
Regression test added for issue 714, where we were using the ADD ovf check for MUL
"""
arguments = [1 << 248, self.state.new_symbolic_value(256)]
self.state.constrain(operators.ULT(arguments[1], 256))
cond = self.io._unsigned_mul_overflow(self.state, *arguments)
check = self.state.can_be_true(cond)
self.assertFalse(check)
def test_mul_no_overflow(self):
"""
Regression test added for issue 714, where we were using the ADD ovf check for MUL
"""
arguments = [1 << (8 * 31), self.state.new_symbolic_value(256)]
self.state.constrain(operators.ULT(arguments[1], 256))
# TODO(mark) We should actually call into the EVM cpu here, and below, rather than
# effectively copy pasting what the MUL does
result = arguments[0] * arguments[1]
check = self.io._can_mul_overflow(self.state, result, *arguments)
self.assertFalse(check)