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/******************************************************************************
* Top contributors (to current version):
* Aina Niemetz, Alex Ozdemir
*
* This file is part of the cvc5 project.
*
* Copyright (c) 2009-2025 by the authors listed in the file AUTHORS
* in the top-level source directory and their institutional affiliations.
* All rights reserved. See the file COPYING in the top-level source
* directory for licensing information.
* ****************************************************************************
*
* Black box testing of cvc5::BitVector.
*/
#include <sstream>
#include "test.h"
#include "util/bitvector.h"
namespace cvc5::internal {
namespace test {
class TestUtilBlackBitVector : public TestInternal
{
protected:
void SetUp() override
{
d_zero = BitVector(4);
d_one = BitVector::mkOne(4);
d_two = BitVector("0010", 2);
d_neg_one = BitVector(4, Integer(-1));
d_ones = BitVector::mkOnes(4);
}
BitVector d_zero;
BitVector d_one;
BitVector d_two;
BitVector d_neg_one;
BitVector d_ones;
};
TEST_F(TestUtilBlackBitVector, string_constructor)
{
BitVector b1("0101", 2);
ASSERT_EQ(4u, b1.getSize());
ASSERT_EQ("0101", b1.toString());
ASSERT_EQ("5", b1.toString(10));
ASSERT_EQ("5", b1.toString(16));
BitVector b2("000001", 2);
ASSERT_EQ(6u, b2.getSize());
ASSERT_EQ("000001", b2.toString());
ASSERT_EQ("1", b2.toString(10));
ASSERT_EQ("1", b2.toString(16));
BitVector b3("7f", 16);
ASSERT_EQ(8u, b3.getSize());
ASSERT_EQ("01111111", b3.toString());
ASSERT_EQ("127", b3.toString(10));
ASSERT_EQ("7f", b3.toString(16));
BitVector b4("01a", 16);
ASSERT_EQ(12u, b4.getSize());
ASSERT_EQ("000000011010", b4.toString());
ASSERT_EQ("26", b4.toString(10));
ASSERT_EQ("1a", b4.toString(16));
ASSERT_DEATH(BitVector("-4", 10), "num\\[0\\] != '-'");
ASSERT_DEATH(BitVector("-0010", 2), "num\\[0\\] != '-'");
ASSERT_DEATH(BitVector("-3210", 4), "base == 2");
ASSERT_EQ(3, BitVector("4", 10).getSize());
}
TEST_F(TestUtilBlackBitVector, conversions)
{
ASSERT_EQ(d_two.toSignedInteger(), Integer(2));
ASSERT_EQ(d_neg_one.toString(), "1111");
ASSERT_EQ(d_neg_one.getValue(), Integer(15));
ASSERT_EQ(d_neg_one.getSize(), 4);
ASSERT_EQ(d_neg_one.toInteger(), Integer(15));
ASSERT_EQ(d_neg_one.toSignedInteger(), Integer(-1));
ASSERT_EQ(d_zero.hash(), (d_one - d_one).hash());
ASSERT_NE(d_neg_one.hash(), d_zero.hash());
}
TEST_F(TestUtilBlackBitVector, setBit_getBit)
{
BitVector ones(d_one);
ASSERT_EQ(ones.setBit(1, true).setBit(2, true).setBit(3, true), d_ones);
BitVector zero(d_ones);
ASSERT_EQ(
zero.setBit(0, false).setBit(1, false).setBit(2, false).setBit(3, false),
d_zero);
ones = d_ones;
ASSERT_EQ(ones.setBit(0, false).setBit(0, true), d_ones);
BitVector not_one(d_ones);
ASSERT_EQ(not_one.setBit(0, false), ~BitVector::mkOne(d_one.getSize()));
ASSERT_TRUE(d_ones.isBitSet(3));
ASSERT_FALSE(d_two.isBitSet(3));
ASSERT_EQ(d_one.getValue(), Integer(1));
ASSERT_EQ(d_zero.isPow2(), 0);
ASSERT_EQ(d_one.isPow2(), 1);
ASSERT_EQ(d_two.isPow2(), 2);
ASSERT_EQ(d_ones.isPow2(), 0);
}
TEST_F(TestUtilBlackBitVector, concat_extract)
{
BitVector b = d_one.concat(d_zero);
ASSERT_EQ(b.toString(), "00010000");
ASSERT_EQ(b.extract(7, 4), d_one);
ASSERT_DEATH(b.extract(4, 7), "low <= high");
ASSERT_DEATH(b.extract(8, 3), "high < d_size");
ASSERT_EQ(b.concat(BitVector()), b);
}
TEST_F(TestUtilBlackBitVector, comparisons)
{
ASSERT_NE(d_zero, d_one);
ASSERT_TRUE(d_neg_one > d_zero);
ASSERT_TRUE(d_neg_one >= d_zero);
ASSERT_TRUE(d_neg_one >= d_neg_one);
ASSERT_TRUE(d_neg_one == d_neg_one);
ASSERT_TRUE(d_zero.unsignedLessThan(d_neg_one));
ASSERT_TRUE(d_zero.unsignedLessThanEq(d_neg_one));
ASSERT_TRUE(d_zero.unsignedLessThanEq(d_zero));
ASSERT_TRUE(d_zero < d_neg_one);
ASSERT_TRUE(d_zero <= d_neg_one);
ASSERT_TRUE(d_zero <= d_zero);
ASSERT_TRUE(d_neg_one.signedLessThan(d_zero));
ASSERT_TRUE(d_neg_one.signedLessThanEq(d_zero));
ASSERT_TRUE(d_neg_one.signedLessThanEq(d_neg_one));
BitVector b = d_neg_one.concat(d_neg_one);
ASSERT_DEATH(b.unsignedLessThan(d_neg_one), "d_size == y.d_size");
ASSERT_DEATH(d_neg_one.unsignedLessThanEq(b), "d_size == y.d_size");
ASSERT_DEATH(b.signedLessThan(d_neg_one), "d_size == y.d_size");
ASSERT_DEATH(d_neg_one.signedLessThanEq(b), "d_size == y.d_size");
}
TEST_F(TestUtilBlackBitVector, bitwise_operators)
{
ASSERT_EQ((d_one ^ d_neg_one).toString(), "1110");
ASSERT_EQ((d_two | d_one).toString(), "0011");
ASSERT_EQ((d_neg_one & d_two).toString(), "0010");
ASSERT_EQ((~d_two).toString(), "1101");
}
TEST_F(TestUtilBlackBitVector, arithmetic)
{
ASSERT_EQ(d_neg_one + d_one, d_zero);
ASSERT_EQ((d_neg_one - d_one).getValue(), Integer(14));
ASSERT_EQ((-d_neg_one).getValue(), Integer(1));
ASSERT_EQ((d_two * (d_two + d_one)).getValue(), Integer(6));
ASSERT_EQ(d_two.unsignedDivTotal(d_zero), d_neg_one);
ASSERT_EQ(d_neg_one.unsignedDivTotal(d_two).getValue(), Integer(7));
ASSERT_EQ(d_two.unsignedRemTotal(d_zero), d_two);
ASSERT_EQ(d_neg_one.unsignedRemTotal(d_two), d_one);
BitVector b = d_neg_one.concat(d_neg_one);
ASSERT_DEATH(b + d_neg_one, "a.getSize\\(\\) == b.getSize\\(\\)");
ASSERT_DEATH(d_neg_one * b, "a.getSize\\(\\) == b.getSize\\(\\)");
ASSERT_DEATH(b.unsignedDivTotal(d_neg_one), "d_size == y\\.d_size");
ASSERT_DEATH(d_neg_one.unsignedRemTotal(b), "d_size == y\\.d_size");
}
TEST_F(TestUtilBlackBitVector, extend_operators)
{
ASSERT_EQ(d_one.zeroExtend(4), d_zero.concat(d_one));
ASSERT_EQ(d_one.zeroExtend(0), d_one);
ASSERT_EQ(d_neg_one.signExtend(4), d_neg_one.concat(d_neg_one));
ASSERT_EQ(d_one.signExtend(4), d_zero.concat(d_one));
ASSERT_EQ(d_one.signExtend(0), d_one);
}
TEST_F(TestUtilBlackBitVector, shift_operators)
{
ASSERT_EQ(d_one.leftShift(d_one), d_two);
ASSERT_EQ(d_one.leftShift(d_neg_one), d_zero);
ASSERT_EQ(d_one.leftShift(d_zero), d_one);
ASSERT_EQ(d_two.logicalRightShift(d_one), d_one);
ASSERT_EQ(d_two.logicalRightShift(d_neg_one), d_zero);
ASSERT_EQ(d_two.arithRightShift(d_one), d_one);
ASSERT_EQ(d_neg_one.arithRightShift(d_one), d_neg_one);
ASSERT_EQ(d_neg_one.arithRightShift(d_neg_one), d_neg_one);
ASSERT_EQ(d_two.arithRightShift(d_neg_one), d_zero);
}
TEST_F(TestUtilBlackBitVector, static_helpers)
{
ASSERT_EQ(BitVector::mkZero(4), d_zero);
ASSERT_EQ(BitVector::mkOne(4), d_one);
ASSERT_EQ(BitVector::mkOnes(4), d_neg_one);
ASSERT_EQ(BitVector::mkMinSigned(4).toSignedInteger(), Integer(-8));
ASSERT_EQ(BitVector::mkMaxSigned(4).toSignedInteger(), Integer(7));
}
} // namespace test
} // namespace cvc5::internal
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