slither/tests/unit/core/test_constant_folding.py

from pathlib import Path
from slither import Slither
from slither.visitors.expression.constants_folding import ConstantFolding

TEST_DATA_DIR = Path(__file__).resolve().parent / "test_data"
CONSTANT_FOLDING_TEST_ROOT = Path(TEST_DATA_DIR, "constant_folding")


def test_constant_folding_unary(use_solc_version):
    solc_path = next(use_solc_version("0.8.0"))
    file = Path(CONSTANT_FOLDING_TEST_ROOT, "constant_folding_unary.sol").as_posix()
    Slither(file, solc=solc_path)


def test_constant_folding_rational(use_solc_version):
    solc_path = next(use_solc_version("0.8.0"))
    s = Slither(Path(CONSTANT_FOLDING_TEST_ROOT, "constant_folding_rational.sol").as_posix(), solc=solc_path)
    contract = s.get_contract_from_name("C")[0]

    variable_a = contract.get_state_variable_from_name("a")
    assert str(variable_a.type) == "uint256"
    assert str(ConstantFolding(variable_a.expression, "uint256").result()) == "10"

    variable_b = contract.get_state_variable_from_name("b")
    assert str(variable_b.type) == "int128"
    assert str(ConstantFolding(variable_b.expression, "int128").result()) == "2"

    variable_c = contract.get_state_variable_from_name("c")
    assert str(variable_c.type) == "int64"
    assert str(ConstantFolding(variable_c.expression, "int64").result()) == "3"

    variable_d = contract.get_state_variable_from_name("d")
    assert str(variable_d.type) == "int256"
    assert str(ConstantFolding(variable_d.expression, "int256").result()) == "1500"

    variable_e = contract.get_state_variable_from_name("e")
    assert str(variable_e.type) == "uint256"
    assert (
        str(ConstantFolding(variable_e.expression, "uint256").result())
        == "57896044618658097711785492504343953926634992332820282019728792003956564819968"
    )

    variable_f = contract.get_state_variable_from_name("f")
    assert str(variable_f.type) == "uint256"
    assert (
        str(ConstantFolding(variable_f.expression, "uint256").result())
        == "115792089237316195423570985008687907853269984665640564039457584007913129639935"
    )

    variable_g = contract.get_state_variable_from_name("g")
    assert str(variable_g.type) == "int64"
    assert str(ConstantFolding(variable_g.expression, "int64").result()) == "-7"


def test_constant_folding_binary_expressions(use_solc_version):
    solc_path = next(use_solc_version("0.8.0"))
    sl = Slither(Path(CONSTANT_FOLDING_TEST_ROOT, "constant_folding_binop.sol").as_posix(), solc=solc_path)
    contract = sl.get_contract_from_name("BinOp")[0]

    variable_a = contract.get_state_variable_from_name("a")
    assert str(variable_a.type) == "uint256"
    assert str(ConstantFolding(variable_a.expression, "uint256").result()) == "0"

    variable_b = contract.get_state_variable_from_name("b")
    assert str(variable_b.type) == "uint256"
    assert str(ConstantFolding(variable_b.expression, "uint256").result()) == "3"

    variable_c = contract.get_state_variable_from_name("c")
    assert str(variable_c.type) == "uint256"
    assert str(ConstantFolding(variable_c.expression, "uint256").result()) == "3"

    variable_d = contract.get_state_variable_from_name("d")
    assert str(variable_d.type) == "bool"
    assert str(ConstantFolding(variable_d.expression, "bool").result()) == "False"

    variable_e = contract.get_state_variable_from_name("e")
    assert str(variable_e.type) == "bool"
    assert str(ConstantFolding(variable_e.expression, "bool").result()) == "False"

    variable_f = contract.get_state_variable_from_name("f")
    assert str(variable_f.type) == "bool"
    assert str(ConstantFolding(variable_f.expression, "bool").result()) == "True"

    variable_g = contract.get_state_variable_from_name("g")
    assert str(variable_g.type) == "bool"
    assert str(ConstantFolding(variable_g.expression, "bool").result()) == "False"

    variable_h = contract.get_state_variable_from_name("h")
    assert str(variable_h.type) == "bool"
    assert str(ConstantFolding(variable_h.expression, "bool").result()) == "False"

    variable_i = contract.get_state_variable_from_name("i")
    assert str(variable_i.type) == "bool"
    assert str(ConstantFolding(variable_i.expression, "bool").result()) == "True"

    variable_j = contract.get_state_variable_from_name("j")
    assert str(variable_j.type) == "bool"
    assert str(ConstantFolding(variable_j.expression, "bool").result()) == "False"

    variable_k = contract.get_state_variable_from_name("k")
    assert str(variable_k.type) == "bool"
    assert str(ConstantFolding(variable_k.expression, "bool").result()) == "True"

    variable_l = contract.get_state_variable_from_name("l")
    assert str(variable_l.type) == "uint256"
    assert (
        str(ConstantFolding(variable_l.expression, "uint256").result())
        == "115792089237316195423570985008687907853269984665640564039457584007913129639935"
    )